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<div class="section" id="tutorial-http-2-server">
<h1>Tutorial: HTTP/2 server<a class="headerlink" href="#tutorial-http-2-server" title="Permalink to this headline"></a></h1>
<p>In this tutorial, we are going to write single-threaded, event-based
HTTP/2 web server, which supports HTTPS only. It can handle
concurrent multiple requests, but only the GET method is supported. The
complete source code, <a class="reference internal" href="#libevent-server-c">libevent-server.c</a>, is attached at the end of
this page. It also resides in examples directory in the archive or
repository.</p>
<p>This simple server takes 3 arguments, a port number to listen to, a path to
your SSL/TLS private key file and a path to your certificate file. Its
synopsis is like this:</p>
<div class="highlight-c"><div class="highlight"><pre>$ libevent-server PORT /path/to/server.key /path/to/server.crt
</pre></div>
</div>
<p>We use libevent in this tutorial to handle networking I/O. Please
note that nghttp2 itself does not depend on libevent.</p>
<p>First we create a setup routine for libevent and OpenSSL in the functions
<tt class="docutils literal"><span class="pre">main()</span></tt> and <tt class="docutils literal"><span class="pre">run()</span></tt>. One thing in there you should look at, is the setup
of the NPN callback. The NPN callback is used for the server to advertise
which application protocols the server supports to a client. In this example
program, when creating <tt class="docutils literal"><span class="pre">SSL_CTX</span></tt> object, we store the application protocol
name in the wire format of NPN in a statically allocated buffer. This is safe
because we only create one <tt class="docutils literal"><span class="pre">SSL_CTX</span></tt> object in the program's entire life
time:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">unsigned</span> <span class="kt">char</span> <span class="n">next_proto_list</span><span class="p">[</span><span class="mi">256</span><span class="p">];</span>
<span class="k">static</span> <span class="kt">size_t</span> <span class="n">next_proto_list_len</span><span class="p">;</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">next_proto_cb</span><span class="p">(</span><span class="n">SSL</span> <span class="o">*</span><span class="n">s</span> <span class="n">_U_</span><span class="p">,</span> <span class="k">const</span> <span class="kt">unsigned</span> <span class="kt">char</span> <span class="o">**</span><span class="n">data</span><span class="p">,</span>
<span class="kt">unsigned</span> <span class="kt">int</span> <span class="o">*</span><span class="n">len</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">arg</span> <span class="n">_U_</span><span class="p">)</span> <span class="p">{</span>
<span class="o">*</span><span class="n">data</span> <span class="o">=</span> <span class="n">next_proto_list</span><span class="p">;</span>
<span class="o">*</span><span class="n">len</span> <span class="o">=</span> <span class="p">(</span><span class="kt">unsigned</span> <span class="kt">int</span><span class="p">)</span><span class="n">next_proto_list_len</span><span class="p">;</span>
<span class="k">return</span> <span class="n">SSL_TLSEXT_ERR_OK</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="n">SSL_CTX</span> <span class="o">*</span><span class="nf">create_ssl_ctx</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">key_file</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">cert_file</span><span class="p">)</span> <span class="p">{</span>
<span class="n">SSL_CTX</span> <span class="o">*</span><span class="n">ssl_ctx</span><span class="p">;</span>
<span class="n">EC_KEY</span> <span class="o">*</span><span class="n">ecdh</span><span class="p">;</span>
<span class="n">ssl_ctx</span> <span class="o">=</span> <span class="n">SSL_CTX_new</span><span class="p">(</span><span class="n">SSLv23_server_method</span><span class="p">());</span>
<span class="p">...</span>
<span class="n">next_proto_list</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="n">NGHTTP2_PROTO_VERSION_ID_LEN</span><span class="p">;</span>
<span class="n">memcpy</span><span class="p">(</span><span class="o">&amp;</span><span class="n">next_proto_list</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">NGHTTP2_PROTO_VERSION_ID</span><span class="p">,</span>
<span class="n">NGHTTP2_PROTO_VERSION_ID_LEN</span><span class="p">);</span>
<span class="n">next_proto_list_len</span> <span class="o">=</span> <span class="mi">1</span> <span class="o">+</span> <span class="n">NGHTTP2_PROTO_VERSION_ID_LEN</span><span class="p">;</span>
<span class="n">SSL_CTX_set_next_protos_advertised_cb</span><span class="p">(</span><span class="n">ssl_ctx</span><span class="p">,</span> <span class="n">next_proto_cb</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="k">return</span> <span class="n">ssl_ctx</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The wire format of NPN is a sequence of length prefixed string. Exactly one
byte is used to specify the length of each protocol identifier. In this
tutorial, we advertise the specific HTTP/2 protocol version the current
nghttp2 library supports. The nghttp2 library exports its identifier in
<a class="reference internal" href="apiref.html#c.NGHTTP2_PROTO_VERSION_ID" title="NGHTTP2_PROTO_VERSION_ID"><tt class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_PROTO_VERSION_ID</span></tt></a>. The <tt class="docutils literal"><span class="pre">next_proto_cb()</span></tt> function is the
server-side NPN callback. In the OpenSSL implementation, we just assign the
pointer to the NPN buffers we filled in earlier. The NPN callback function is
set to the <tt class="docutils literal"><span class="pre">SSL_CTX</span></tt> object using
<tt class="docutils literal"><span class="pre">SSL_CTX_set_next_protos_advertised_cb()</span></tt>.</p>
<p>We use the <tt class="docutils literal"><span class="pre">app_content</span></tt> structure to store application-wide data:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">app_context</span> <span class="p">{</span>
<span class="n">SSL_CTX</span> <span class="o">*</span><span class="n">ssl_ctx</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">event_base</span> <span class="o">*</span><span class="n">evbase</span><span class="p">;</span>
<span class="p">};</span>
</pre></div>
</div>
<p>We use the <tt class="docutils literal"><span class="pre">http2_session_data</span></tt> structure to store session-level
(which corresponds to one HTTP/2 connection) data:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">typedef</span> <span class="k">struct</span> <span class="n">http2_session_data</span> <span class="p">{</span>
<span class="k">struct</span> <span class="n">http2_stream_data</span> <span class="n">root</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span><span class="p">;</span>
<span class="n">app_context</span> <span class="o">*</span><span class="n">app_ctx</span><span class="p">;</span>
<span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">;</span>
<span class="kt">char</span> <span class="o">*</span><span class="n">client_addr</span><span class="p">;</span>
<span class="p">}</span> <span class="n">http2_session_data</span><span class="p">;</span>
</pre></div>
</div>
<p>We use the <tt class="docutils literal"><span class="pre">http2_stream_data</span></tt> structure to store stream-level data:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">typedef</span> <span class="k">struct</span> <span class="n">http2_stream_data</span> <span class="p">{</span>
<span class="k">struct</span> <span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">prev</span><span class="p">,</span> <span class="o">*</span><span class="n">next</span><span class="p">;</span>
<span class="kt">char</span> <span class="o">*</span><span class="n">request_path</span><span class="p">;</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">;</span>
<span class="kt">int</span> <span class="n">fd</span><span class="p">;</span>
<span class="p">}</span> <span class="n">http2_stream_data</span><span class="p">;</span>
</pre></div>
</div>
<p>A single HTTP/2 session can have multiple streams. We manage these
multiple streams with a doubly linked list. The first element of this
list is pointed to by the <tt class="docutils literal"><span class="pre">root-&gt;next</span></tt> in <tt class="docutils literal"><span class="pre">http2_session_data</span></tt>.
Initially, <tt class="docutils literal"><span class="pre">root-&gt;next</span></tt> is <tt class="docutils literal"><span class="pre">NULL</span></tt>. We use libevent's bufferevent
structure to perform network I/O. Note that the bufferevent object is
kept in <tt class="docutils literal"><span class="pre">http2_session_data</span></tt> and not in <tt class="docutils literal"><span class="pre">http2_stream_data</span></tt>. This
is because <tt class="docutils literal"><span class="pre">http2_stream_data</span></tt> is just a logical stream multiplexed
over the single connection managed by bufferevent in
<tt class="docutils literal"><span class="pre">http2_session_data</span></tt>.</p>
<p>We first create a listener object to accept incoming connections. We use
libevent's <tt class="docutils literal"><span class="pre">struct</span> <span class="pre">evconnlistener</span></tt> for this purpose:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">void</span> <span class="nf">start_listen</span><span class="p">(</span><span class="k">struct</span> <span class="n">event_base</span> <span class="o">*</span><span class="n">evbase</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">service</span><span class="p">,</span>
<span class="n">app_context</span> <span class="o">*</span><span class="n">app_ctx</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">addrinfo</span> <span class="n">hints</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">addrinfo</span> <span class="o">*</span><span class="n">res</span><span class="p">,</span> <span class="o">*</span><span class="n">rp</span><span class="p">;</span>
<span class="n">memset</span><span class="p">(</span><span class="o">&amp;</span><span class="n">hints</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">hints</span><span class="p">));</span>
<span class="n">hints</span><span class="p">.</span><span class="n">ai_family</span> <span class="o">=</span> <span class="n">AF_UNSPEC</span><span class="p">;</span>
<span class="n">hints</span><span class="p">.</span><span class="n">ai_socktype</span> <span class="o">=</span> <span class="n">SOCK_STREAM</span><span class="p">;</span>
<span class="n">hints</span><span class="p">.</span><span class="n">ai_flags</span> <span class="o">=</span> <span class="n">AI_PASSIVE</span><span class="p">;</span>
<span class="cp">#ifdef AI_ADDRCONFIG</span>
<span class="n">hints</span><span class="p">.</span><span class="n">ai_flags</span> <span class="o">|=</span> <span class="n">AI_ADDRCONFIG</span><span class="p">;</span>
<span class="cp">#endif </span><span class="cm">/* AI_ADDRCONFIG */</span><span class="cp"></span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">getaddrinfo</span><span class="p">(</span><span class="nb">NULL</span><span class="p">,</span> <span class="n">service</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">hints</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">for</span> <span class="p">(</span><span class="n">rp</span> <span class="o">=</span> <span class="n">res</span><span class="p">;</span> <span class="n">rp</span><span class="p">;</span> <span class="n">rp</span> <span class="o">=</span> <span class="n">rp</span><span class="o">-&gt;</span><span class="n">ai_next</span><span class="p">)</span> <span class="p">{</span>
<span class="k">struct</span> <span class="n">evconnlistener</span> <span class="o">*</span><span class="n">listener</span><span class="p">;</span>
<span class="n">listener</span> <span class="o">=</span> <span class="n">evconnlistener_new_bind</span><span class="p">(</span>
<span class="n">evbase</span><span class="p">,</span> <span class="n">acceptcb</span><span class="p">,</span> <span class="n">app_ctx</span><span class="p">,</span> <span class="n">LEV_OPT_CLOSE_ON_FREE</span> <span class="o">|</span> <span class="n">LEV_OPT_REUSEABLE</span><span class="p">,</span>
<span class="mi">16</span><span class="p">,</span> <span class="n">rp</span><span class="o">-&gt;</span><span class="n">ai_addr</span><span class="p">,</span> <span class="n">rp</span><span class="o">-&gt;</span><span class="n">ai_addrlen</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">listener</span><span class="p">)</span> <span class="p">{</span>
<span class="n">freeaddrinfo</span><span class="p">(</span><span class="n">res</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">&quot;Could not start listener&quot;</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<p>We specify the <tt class="docutils literal"><span class="pre">acceptcb</span></tt> callback which is called when a new connection is
accepted:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">void</span> <span class="nf">acceptcb</span><span class="p">(</span><span class="k">struct</span> <span class="n">evconnlistener</span> <span class="o">*</span><span class="n">listener</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">int</span> <span class="n">fd</span><span class="p">,</span>
<span class="k">struct</span> <span class="n">sockaddr</span> <span class="o">*</span><span class="n">addr</span><span class="p">,</span> <span class="kt">int</span> <span class="n">addrlen</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">arg</span><span class="p">)</span> <span class="p">{</span>
<span class="n">app_context</span> <span class="o">*</span><span class="n">app_ctx</span> <span class="o">=</span> <span class="p">(</span><span class="n">app_context</span> <span class="o">*</span><span class="p">)</span><span class="n">arg</span><span class="p">;</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">;</span>
<span class="n">session_data</span> <span class="o">=</span> <span class="n">create_http2_session_data</span><span class="p">(</span><span class="n">app_ctx</span><span class="p">,</span> <span class="n">fd</span><span class="p">,</span> <span class="n">addr</span><span class="p">,</span> <span class="n">addrlen</span><span class="p">);</span>
<span class="n">bufferevent_setcb</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">,</span> <span class="n">readcb</span><span class="p">,</span> <span class="n">writecb</span><span class="p">,</span> <span class="n">eventcb</span><span class="p">,</span> <span class="n">session_data</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Here we create the <tt class="docutils literal"><span class="pre">http2_session_data</span></tt> object. The bufferevent for
this connection is also initialized at this time. We specify three
callbacks for the bufferevent: <tt class="docutils literal"><span class="pre">readcb</span></tt>, <tt class="docutils literal"><span class="pre">writecb</span></tt> and
<tt class="docutils literal"><span class="pre">eventcb</span></tt>.</p>
<p>The <tt class="docutils literal"><span class="pre">eventcb()</span></tt> callback is invoked by the libevent event loop when an event
(e.g., connection has been established, timeout, etc) happens on the
underlying network socket:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">void</span> <span class="nf">eventcb</span><span class="p">(</span><span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">short</span> <span class="n">events</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">ptr</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">ptr</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">events</span> <span class="o">&amp;</span> <span class="n">BEV_EVENT_CONNECTED</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s connected</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="n">initialize_nghttp2_session</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">send_server_connection_header</span><span class="p">(</span><span class="n">session_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">events</span> <span class="o">&amp;</span> <span class="n">BEV_EVENT_EOF</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s EOF</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">events</span> <span class="o">&amp;</span> <span class="n">BEV_EVENT_ERROR</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s network error</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">events</span> <span class="o">&amp;</span> <span class="n">BEV_EVENT_TIMEOUT</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s timeout</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<p>For the <tt class="docutils literal"><span class="pre">BEV_EVENT_EOF</span></tt>, <tt class="docutils literal"><span class="pre">BEV_EVENT_ERROR</span></tt> and
<tt class="docutils literal"><span class="pre">BEV_EVENT_TIMEOUT</span></tt> events, we just simply tear down the connection.
The <tt class="docutils literal"><span class="pre">delete_http2_session_data()</span></tt> function destroys the
<tt class="docutils literal"><span class="pre">http2_session_data</span></tt> object and thus also its bufferevent member.
As a result, the underlying connection is closed. The
<tt class="docutils literal"><span class="pre">BEV_EVENT_CONNECTED</span></tt> event is invoked when SSL/TLS handshake is
finished successfully. Now we are ready to start the HTTP/2
communication.</p>
<p>We initialize a nghttp2 session object which is done in
<tt class="docutils literal"><span class="pre">initialize_nghttp2_session()</span></tt>:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">void</span> <span class="nf">initialize_nghttp2_session</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">nghttp2_option</span> <span class="o">*</span><span class="n">option</span><span class="p">;</span>
<span class="n">nghttp2_session_callbacks</span> <span class="o">*</span><span class="n">callbacks</span><span class="p">;</span>
<span class="n">nghttp2_option_new</span><span class="p">(</span><span class="o">&amp;</span><span class="n">option</span><span class="p">);</span>
<span class="cm">/* Tells nghttp2_session object that it handles client connection</span>
<span class="cm"> preface */</span>
<span class="n">nghttp2_option_set_recv_client_preface</span><span class="p">(</span><span class="n">option</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_new</span><span class="p">(</span><span class="o">&amp;</span><span class="n">callbacks</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_send_callback</span><span class="p">(</span><span class="n">callbacks</span><span class="p">,</span> <span class="n">send_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_on_frame_recv_callback</span><span class="p">(</span><span class="n">callbacks</span><span class="p">,</span>
<span class="n">on_frame_recv_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_on_stream_close_callback</span><span class="p">(</span>
<span class="n">callbacks</span><span class="p">,</span> <span class="n">on_stream_close_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_on_header_callback</span><span class="p">(</span><span class="n">callbacks</span><span class="p">,</span>
<span class="n">on_header_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_on_begin_headers_callback</span><span class="p">(</span>
<span class="n">callbacks</span><span class="p">,</span> <span class="n">on_begin_headers_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_server_new2</span><span class="p">(</span><span class="o">&amp;</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">,</span> <span class="n">callbacks</span><span class="p">,</span> <span class="n">session_data</span><span class="p">,</span>
<span class="n">option</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_del</span><span class="p">(</span><span class="n">callbacks</span><span class="p">);</span>
<span class="n">nghttp2_option_del</span><span class="p">(</span><span class="n">option</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Since we are creating a server and uses options, the nghttp2 session
object is created using <a class="reference internal" href="apiref.html#c.nghttp2_session_server_new2" title="nghttp2_session_server_new2"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_server_new2()</span></tt></a> function. We
registers five callbacks for nghttp2 session object. We'll talk about
these callbacks later. Our server only speaks HTTP/2. In this case,
we use <a class="reference internal" href="apiref.html#c.nghttp2_option_set_recv_client_preface" title="nghttp2_option_set_recv_client_preface"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_option_set_recv_client_preface()</span></tt></a> to make
<a class="reference internal" href="apiref.html#c.nghttp2_session" title="nghttp2_session"><tt class="xref c c-type docutils literal"><span class="pre">nghttp2_session</span></tt></a> object handle client connection preface, which
saves some lines of application code.</p>
<p>After initialization of the nghttp2 session object, we are going to send
a server connection header in <tt class="docutils literal"><span class="pre">send_server_connection_header()</span></tt>:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">int</span> <span class="nf">send_server_connection_header</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">nghttp2_settings_entry</span> <span class="n">iv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="p">{</span>
<span class="p">{</span><span class="n">NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS</span><span class="p">,</span> <span class="mi">100</span><span class="p">}};</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">nghttp2_submit_settings</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">,</span> <span class="n">NGHTTP2_FLAG_NONE</span><span class="p">,</span> <span class="n">iv</span><span class="p">,</span>
<span class="n">ARRLEN</span><span class="p">(</span><span class="n">iv</span><span class="p">));</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">(</span><span class="n">rv</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The server connection header is a SETTINGS frame. We specify
SETTINGS_MAX_CONCURRENT_STREAMS to 100 in the SETTINGS frame. To queue
the SETTINGS frame for the transmission, we use
<a class="reference internal" href="apiref.html#c.nghttp2_submit_settings" title="nghttp2_submit_settings"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_submit_settings()</span></tt></a>. Note that <a class="reference internal" href="apiref.html#c.nghttp2_submit_settings" title="nghttp2_submit_settings"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_submit_settings()</span></tt></a>
function only queues the frame and it does not actually send it. All
functions in the <tt class="docutils literal"><span class="pre">nghttp2_submit_*()</span></tt> family have this property. To
actually send the frame, <a class="reference internal" href="apiref.html#c.nghttp2_session_send" title="nghttp2_session_send"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_send()</span></tt></a> should be used, as
described later.</p>
<p>Since bufferevent may buffer more than the first 24 bytes from the client, we
have to process them here since libevent won't invoke callback functions for
this pending data. To process the received data, we call the
<tt class="docutils literal"><span class="pre">session_recv()</span></tt> function:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">int</span> <span class="nf">session_recv</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">ssize_t</span> <span class="n">readlen</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">evbuffer</span> <span class="o">*</span><span class="n">input</span> <span class="o">=</span> <span class="n">bufferevent_get_input</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">);</span>
<span class="kt">size_t</span> <span class="n">datalen</span> <span class="o">=</span> <span class="n">evbuffer_get_length</span><span class="p">(</span><span class="n">input</span><span class="p">);</span>
<span class="kt">unsigned</span> <span class="kt">char</span> <span class="o">*</span><span class="n">data</span> <span class="o">=</span> <span class="n">evbuffer_pullup</span><span class="p">(</span><span class="n">input</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">);</span>
<span class="n">readlen</span> <span class="o">=</span> <span class="n">nghttp2_session_mem_recv</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">datalen</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">readlen</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">((</span><span class="kt">int</span><span class="p">)</span><span class="n">readlen</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">evbuffer_drain</span><span class="p">(</span><span class="n">input</span><span class="p">,</span> <span class="n">readlen</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: evbuffer_drain failed&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">session_send</span><span class="p">(</span><span class="n">session_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>In this function, we feed all unprocessed but already received data to the
nghttp2 session object using the <a class="reference internal" href="apiref.html#c.nghttp2_session_mem_recv" title="nghttp2_session_mem_recv"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_mem_recv()</span></tt></a> function. The
<a class="reference internal" href="apiref.html#c.nghttp2_session_mem_recv" title="nghttp2_session_mem_recv"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_mem_recv()</span></tt></a> function processes the data and may invoke the
nghttp2 callbacks and also queue outgoing frames. Since there may be pending
outgoing frames, we call <tt class="docutils literal"><span class="pre">session_send()</span></tt> function to send off those
frames. The <tt class="docutils literal"><span class="pre">session_send()</span></tt> function is defined as follows:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">int</span> <span class="nf">session_send</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">nghttp2_session_send</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">(</span><span class="n">rv</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The <a class="reference internal" href="apiref.html#c.nghttp2_session_send" title="nghttp2_session_send"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_send()</span></tt></a> function serializes the frame into wire
format and calls <tt class="docutils literal"><span class="pre">send_callback()</span></tt> of type
<a class="reference internal" href="apiref.html#c.nghttp2_send_callback" title="nghttp2_send_callback"><tt class="xref c c-type docutils literal"><span class="pre">nghttp2_send_callback</span></tt></a>. The <tt class="docutils literal"><span class="pre">send_callback()</span></tt> is defined as
follows:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">ssize_t</span> <span class="nf">send_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span> <span class="n">_U_</span><span class="p">,</span> <span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">length</span><span class="p">,</span> <span class="kt">int</span> <span class="n">flags</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">user_data</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span> <span class="o">=</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">;</span>
<span class="cm">/* Avoid excessive buffering in server side. */</span>
<span class="k">if</span> <span class="p">(</span><span class="n">evbuffer_get_length</span><span class="p">(</span><span class="n">bufferevent_get_output</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">))</span> <span class="o">&gt;=</span>
<span class="n">OUTPUT_WOULDBLOCK_THRESHOLD</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">NGHTTP2_ERR_WOULDBLOCK</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">bufferevent_write</span><span class="p">(</span><span class="n">bev</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">length</span><span class="p">);</span>
<span class="k">return</span> <span class="n">length</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Since we use bufferevent to abstract network I/O, we just write the
data to the bufferevent object. Note that <a class="reference internal" href="apiref.html#c.nghttp2_session_send" title="nghttp2_session_send"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_send()</span></tt></a>
continues to write all frames queued so far. If we were writing the
data to a non-blocking socket directly using <tt class="docutils literal"><span class="pre">write()</span></tt> system call
in the <tt class="docutils literal"><span class="pre">send_callback()</span></tt>, we would surely get <tt class="docutils literal"><span class="pre">EAGAIN</span></tt> or
<tt class="docutils literal"><span class="pre">EWOULDBLOCK</span></tt> back since the socket has limited send buffer. If that
happens, we can return <a class="reference internal" href="apiref.html#c.NGHTTP2_ERR_WOULDBLOCK" title="NGHTTP2_ERR_WOULDBLOCK"><tt class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_ERR_WOULDBLOCK</span></tt></a> to signal the
nghttp2 library to stop sending further data. But when writing to the
bufferevent, we have to regulate the amount data to get buffered
ourselves to avoid using huge amounts of memory. To achieve this, we
check the size of the output buffer and if it reaches more than or
equal to <tt class="docutils literal"><span class="pre">OUTPUT_WOULDBLOCK_THRESHOLD</span></tt> bytes, we stop writing data
and return <a class="reference internal" href="apiref.html#c.NGHTTP2_ERR_WOULDBLOCK" title="NGHTTP2_ERR_WOULDBLOCK"><tt class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_ERR_WOULDBLOCK</span></tt></a> to tell the library to stop
calling send_callback.</p>
<p>The next bufferevent callback is <tt class="docutils literal"><span class="pre">readcb()</span></tt>, which is invoked when
data is available to read in the bufferevent input buffer:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">void</span> <span class="nf">readcb</span><span class="p">(</span><span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">ptr</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">ptr</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">session_recv</span><span class="p">(</span><span class="n">session_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>In this function, we just call <tt class="docutils literal"><span class="pre">session_recv()</span></tt> to process incoming
data.</p>
<p>The third bufferevent callback is <tt class="docutils literal"><span class="pre">writecb()</span></tt>, which is invoked when all
data in the bufferevent output buffer has been sent:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">void</span> <span class="nf">writecb</span><span class="p">(</span><span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">ptr</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">ptr</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">evbuffer_get_length</span><span class="p">(</span><span class="n">bufferevent_get_output</span><span class="p">(</span><span class="n">bev</span><span class="p">))</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">nghttp2_session_want_read</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span> <span class="o">&amp;&amp;</span>
<span class="n">nghttp2_session_want_write</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">session_send</span><span class="p">(</span><span class="n">session_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>First we check whether we should drop the connection or not. The nghttp2
session object keeps track of reception and transmission of GOAWAY frames and
other error conditions as well. Using this information, the nghttp2 session
object will tell whether the connection should be dropped or not. More
specifically, if both <a class="reference internal" href="apiref.html#c.nghttp2_session_want_read" title="nghttp2_session_want_read"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_want_read()</span></tt></a> and
<a class="reference internal" href="apiref.html#c.nghttp2_session_want_write" title="nghttp2_session_want_write"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_want_write()</span></tt></a> return 0, we have no business left in the
connection. But since we are using bufferevent and its deferred callback
option, the bufferevent output buffer may contain pending data when the
<tt class="docutils literal"><span class="pre">writecb()</span></tt> is called. To handle this, we check whether the output buffer is
empty or not. If all these conditions are met, we drop connection.</p>
<p>Otherwise, we call <tt class="docutils literal"><span class="pre">session_send()</span></tt> to process the pending output
data. Remember that in <tt class="docutils literal"><span class="pre">send_callback()</span></tt>, we must not write all data to
bufferevent to avoid excessive buffering. We continue processing pending data
when the output buffer becomes empty.</p>
<p>We have already described the nghttp2 callback <tt class="docutils literal"><span class="pre">send_callback()</span></tt>. Let's
learn about the remaining nghttp2 callbacks we setup in
<tt class="docutils literal"><span class="pre">initialize_nghttp2_setup()</span></tt> function.</p>
<p>The <tt class="docutils literal"><span class="pre">on_begin_headers_callback()</span></tt> function is invoked when the reception of
a header block in HEADERS or PUSH_PROMISE frame is started:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">int</span> <span class="nf">on_begin_headers_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">user_data</span><span class="p">;</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">type</span> <span class="o">!=</span> <span class="n">NGHTTP2_HEADERS</span> <span class="o">||</span>
<span class="n">frame</span><span class="o">-&gt;</span><span class="n">headers</span><span class="p">.</span><span class="n">cat</span> <span class="o">!=</span> <span class="n">NGHTTP2_HCAT_REQUEST</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">stream_data</span> <span class="o">=</span> <span class="n">create_http2_stream_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">,</span> <span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">stream_id</span><span class="p">);</span>
<span class="n">nghttp2_session_set_stream_user_data</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">stream_id</span><span class="p">,</span>
<span class="n">stream_data</span><span class="p">);</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>We are only interested in the HEADERS frame in this function. Since the
HEADERS frame has several roles in the HTTP/2 protocol, we check that it is a
request HEADERS, which opens new stream. If the frame is a request HEADERS, we
create a <tt class="docutils literal"><span class="pre">http2_stream_data</span></tt> object to store the stream related data. We
associate the created <tt class="docutils literal"><span class="pre">http2_stream_data</span></tt> object with the stream in the
nghttp2 session object using <tt class="xref c c-func docutils literal"><span class="pre">nghttp2_set_stream_user_data()</span></tt> to get the
object without searching through the doubly linked list.</p>
<p>In this example server, we want to serve files relative to the current working
directory in which the program was invoked. Each header name/value pair is
emitted via <tt class="docutils literal"><span class="pre">on_header_callback</span></tt> function, which is called after
<tt class="docutils literal"><span class="pre">on_begin_headers_callback()</span></tt>:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">int</span> <span class="nf">on_header_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">name</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">namelen</span><span class="p">,</span> <span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">value</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">valuelen</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span> <span class="n">_U_</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span> <span class="n">_U_</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="k">const</span> <span class="kt">char</span> <span class="n">PATH</span><span class="p">[]</span> <span class="o">=</span> <span class="s">&quot;:path&quot;</span><span class="p">;</span>
<span class="k">switch</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">type</span><span class="p">)</span> <span class="p">{</span>
<span class="k">case</span> <span class="nl">NGHTTP2_HEADERS</span><span class="p">:</span>
<span class="k">if</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">headers</span><span class="p">.</span><span class="n">cat</span> <span class="o">!=</span> <span class="n">NGHTTP2_HCAT_REQUEST</span><span class="p">)</span> <span class="p">{</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">stream_data</span> <span class="o">=</span>
<span class="n">nghttp2_session_get_stream_user_data</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">stream_id</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">stream_data</span> <span class="o">||</span> <span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span><span class="p">)</span> <span class="p">{</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">namelen</span> <span class="o">==</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">PATH</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span> <span class="o">&amp;&amp;</span> <span class="n">memcmp</span><span class="p">(</span><span class="n">PATH</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">namelen</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">size_t</span> <span class="n">j</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(</span><span class="n">j</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">j</span> <span class="o">&lt;</span> <span class="n">valuelen</span> <span class="o">&amp;&amp;</span> <span class="n">value</span><span class="p">[</span><span class="n">j</span><span class="p">]</span> <span class="o">!=</span> <span class="sc">&#39;?&#39;</span><span class="p">;</span> <span class="o">++</span><span class="n">j</span><span class="p">)</span>
<span class="p">;</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span> <span class="o">=</span> <span class="n">percent_decode</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">j</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>We search for the <tt class="docutils literal"><span class="pre">:path</span></tt> header field among the request headers and store
the requested path in the <tt class="docutils literal"><span class="pre">http2_stream_data</span></tt> object. In this example
program, we ignore <tt class="docutils literal"><span class="pre">:method</span></tt> header field and always treat the request as a
GET request.</p>
<p>The <tt class="docutils literal"><span class="pre">on_frame_recv_callback()</span></tt> function is invoked when a frame is
fully received:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">int</span> <span class="nf">on_frame_recv_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">user_data</span><span class="p">;</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="k">switch</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">type</span><span class="p">)</span> <span class="p">{</span>
<span class="k">case</span> <span class="nl">NGHTTP2_DATA</span><span class="p">:</span>
<span class="k">case</span> <span class="nl">NGHTTP2_HEADERS</span><span class="p">:</span>
<span class="cm">/* Check that the client request has finished */</span>
<span class="k">if</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">flags</span> <span class="o">&amp;</span> <span class="n">NGHTTP2_FLAG_END_STREAM</span><span class="p">)</span> <span class="p">{</span>
<span class="n">stream_data</span> <span class="o">=</span>
<span class="n">nghttp2_session_get_stream_user_data</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">stream_id</span><span class="p">);</span>
<span class="cm">/* For DATA and HEADERS frame, this callback may be called after</span>
<span class="cm"> on_stream_close_callback. Check that stream still alive. */</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">on_request_recv</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">session_data</span><span class="p">,</span> <span class="n">stream_data</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">break</span><span class="p">;</span>
<span class="k">default</span><span class="o">:</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>First we retrieve the <tt class="docutils literal"><span class="pre">http2_stream_data</span></tt> object associated with the stream
in <tt class="docutils literal"><span class="pre">on_begin_headers_callback()</span></tt>. It is done using
<a class="reference internal" href="apiref.html#c.nghttp2_session_get_stream_user_data" title="nghttp2_session_get_stream_user_data"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_session_get_stream_user_data()</span></tt></a>. If the requested path cannot be
served for some reason (e.g., file is not found), we send a 404 response,
which is done in <tt class="docutils literal"><span class="pre">error_reply()</span></tt>. Otherwise, we open the requested file and
send its content. We send the header field <tt class="docutils literal"><span class="pre">:status</span></tt> as a single response
header.</p>
<p>Sending the content of the file is done in <tt class="docutils literal"><span class="pre">send_response()</span></tt> function:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">int</span> <span class="nf">send_response</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">nva</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">nvlen</span><span class="p">,</span> <span class="kt">int</span> <span class="n">fd</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="n">nghttp2_data_provider</span> <span class="n">data_prd</span><span class="p">;</span>
<span class="n">data_prd</span><span class="p">.</span><span class="n">source</span><span class="p">.</span><span class="n">fd</span> <span class="o">=</span> <span class="n">fd</span><span class="p">;</span>
<span class="n">data_prd</span><span class="p">.</span><span class="n">read_callback</span> <span class="o">=</span> <span class="n">file_read_callback</span><span class="p">;</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">nghttp2_submit_response</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_id</span><span class="p">,</span> <span class="n">nva</span><span class="p">,</span> <span class="n">nvlen</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">data_prd</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">(</span><span class="n">rv</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The nghttp2 library uses the <a class="reference internal" href="apiref.html#c.nghttp2_data_provider" title="nghttp2_data_provider"><tt class="xref c c-type docutils literal"><span class="pre">nghttp2_data_provider</span></tt></a> structure to
send entity body to the remote peer. The <tt class="docutils literal"><span class="pre">source</span></tt> member of this
structure is a union and it can be either void pointer or int which is
intended to be used as file descriptor. In this example server, we use
the file descriptor. We also set the <tt class="docutils literal"><span class="pre">file_read_callback()</span></tt> callback
function to read the contents of the file:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">ssize_t</span> <span class="nf">file_read_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span> <span class="n">_U_</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">length</span><span class="p">,</span> <span class="kt">uint32_t</span> <span class="o">*</span><span class="n">data_flags</span><span class="p">,</span>
<span class="n">nghttp2_data_source</span> <span class="o">*</span><span class="n">source</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span> <span class="n">_U_</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">fd</span> <span class="o">=</span> <span class="n">source</span><span class="o">-&gt;</span><span class="n">fd</span><span class="p">;</span>
<span class="kt">ssize_t</span> <span class="n">r</span><span class="p">;</span>
<span class="k">while</span> <span class="p">((</span><span class="n">r</span> <span class="o">=</span> <span class="n">read</span><span class="p">(</span><span class="n">fd</span><span class="p">,</span> <span class="n">buf</span><span class="p">,</span> <span class="n">length</span><span class="p">))</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span> <span class="o">&amp;&amp;</span> <span class="n">errno</span> <span class="o">==</span> <span class="n">EINTR</span><span class="p">)</span>
<span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">r</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">r</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="o">*</span><span class="n">data_flags</span> <span class="o">|=</span> <span class="n">NGHTTP2_DATA_FLAG_EOF</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">r</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>If an error happens while reading the file, we return
<a class="reference internal" href="apiref.html#c.NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE" title="NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE"><tt class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE</span></tt></a>. This tells the
library to send RST_STREAM to the stream. When all data has been read, set
the <a class="reference internal" href="apiref.html#c.NGHTTP2_DATA_FLAG_EOF" title="NGHTTP2_DATA_FLAG_EOF"><tt class="xref c c-macro docutils literal"><span class="pre">NGHTTP2_DATA_FLAG_EOF</span></tt></a> flag to <tt class="docutils literal"><span class="pre">*data_flags</span></tt> to tell the
nghttp2 library that we have finished reading the file.</p>
<p>The <a class="reference internal" href="apiref.html#c.nghttp2_submit_response" title="nghttp2_submit_response"><tt class="xref c c-func docutils literal"><span class="pre">nghttp2_submit_response()</span></tt></a> function is used to send the response to the
remote peer.</p>
<p>The <tt class="docutils literal"><span class="pre">on_stream_close_callback()</span></tt> function is invoked when the stream
is about to close:</p>
<div class="highlight-c"><div class="highlight"><pre><span class="k">static</span> <span class="kt">int</span> <span class="nf">on_stream_close_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="kt">uint32_t</span> <span class="n">error_code</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">user_data</span><span class="p">;</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="n">stream_data</span> <span class="o">=</span> <span class="n">nghttp2_session_get_stream_user_data</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_id</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">remove_stream</span><span class="p">(</span><span class="n">session_data</span><span class="p">,</span> <span class="n">stream_data</span><span class="p">);</span>
<span class="n">delete_http2_stream_data</span><span class="p">(</span><span class="n">stream_data</span><span class="p">);</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<p>We destroy the <tt class="docutils literal"><span class="pre">http2_stream_data</span></tt> object in this function since the stream
is about to close and we no longer use that object.</p>
<div class="section" id="libevent-server-c">
<h2>libevent-server.c<a class="headerlink" href="#libevent-server-c" title="Permalink to this headline"></a></h2>
<div class="highlight-c"><div class="highlight"><pre><span class="cm">/*</span>
<span class="cm"> * nghttp2 - HTTP/2 C Library</span>
<span class="cm"> *</span>
<span class="cm"> * Copyright (c) 2013 Tatsuhiro Tsujikawa</span>
<span class="cm"> *</span>
<span class="cm"> * Permission is hereby granted, free of charge, to any person obtaining</span>
<span class="cm"> * a copy of this software and associated documentation files (the</span>
<span class="cm"> * &quot;Software&quot;), to deal in the Software without restriction, including</span>
<span class="cm"> * without limitation the rights to use, copy, modify, merge, publish,</span>
<span class="cm"> * distribute, sublicense, and/or sell copies of the Software, and to</span>
<span class="cm"> * permit persons to whom the Software is furnished to do so, subject to</span>
<span class="cm"> * the following conditions:</span>
<span class="cm"> *</span>
<span class="cm"> * The above copyright notice and this permission notice shall be</span>
<span class="cm"> * included in all copies or substantial portions of the Software.</span>
<span class="cm"> *</span>
<span class="cm"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,</span>
<span class="cm"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
<span class="cm"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span>
<span class="cm"> * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE</span>
<span class="cm"> * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION</span>
<span class="cm"> * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span>
<span class="cm"> * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>
<span class="cm"> */</span>
<span class="cp">#ifdef HAVE_CONFIG_H</span>
<span class="cp">#include &lt;config.h&gt;</span>
<span class="cp">#endif </span><span class="cm">/* !HAVE_CONFIG_H */</span><span class="cp"></span>
<span class="cp">#include &lt;sys/types.h&gt;</span>
<span class="cp">#include &lt;sys/socket.h&gt;</span>
<span class="cp">#include &lt;netdb.h&gt;</span>
<span class="cp">#include &lt;signal.h&gt;</span>
<span class="cp">#include &lt;unistd.h&gt;</span>
<span class="cp">#include &lt;sys/stat.h&gt;</span>
<span class="cp">#include &lt;fcntl.h&gt;</span>
<span class="cp">#include &lt;ctype.h&gt;</span>
<span class="cp">#include &lt;netinet/in.h&gt;</span>
<span class="cp">#include &lt;netinet/tcp.h&gt;</span>
<span class="cp">#include &lt;err.h&gt;</span>
<span class="cp">#include &lt;openssl/ssl.h&gt;</span>
<span class="cp">#include &lt;openssl/err.h&gt;</span>
<span class="cp">#include &lt;openssl/conf.h&gt;</span>
<span class="cp">#include &lt;event.h&gt;</span>
<span class="cp">#include &lt;event2/event.h&gt;</span>
<span class="cp">#include &lt;event2/bufferevent_ssl.h&gt;</span>
<span class="cp">#include &lt;event2/listener.h&gt;</span>
<span class="cp">#include &lt;nghttp2/nghttp2.h&gt;</span>
<span class="cp">#define OUTPUT_WOULDBLOCK_THRESHOLD (1 &lt;&lt; 16)</span>
<span class="cp">#define ARRLEN(x) (sizeof(x) / sizeof(x[0]))</span>
<span class="cp">#define MAKE_NV(NAME, VALUE) \</span>
<span class="cp"> { \</span>
<span class="cp"> (uint8_t *) NAME, (uint8_t *)VALUE, sizeof(NAME) - 1, sizeof(VALUE) - 1, \</span>
<span class="cp"> NGHTTP2_NV_FLAG_NONE \</span>
<span class="cp"> }</span>
<span class="k">struct</span> <span class="n">app_context</span><span class="p">;</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="n">app_context</span> <span class="n">app_context</span><span class="p">;</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="n">http2_stream_data</span> <span class="p">{</span>
<span class="k">struct</span> <span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">prev</span><span class="p">,</span> <span class="o">*</span><span class="n">next</span><span class="p">;</span>
<span class="kt">char</span> <span class="o">*</span><span class="n">request_path</span><span class="p">;</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">;</span>
<span class="kt">int</span> <span class="n">fd</span><span class="p">;</span>
<span class="p">}</span> <span class="n">http2_stream_data</span><span class="p">;</span>
<span class="k">typedef</span> <span class="k">struct</span> <span class="n">http2_session_data</span> <span class="p">{</span>
<span class="k">struct</span> <span class="n">http2_stream_data</span> <span class="n">root</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span><span class="p">;</span>
<span class="n">app_context</span> <span class="o">*</span><span class="n">app_ctx</span><span class="p">;</span>
<span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">;</span>
<span class="kt">char</span> <span class="o">*</span><span class="n">client_addr</span><span class="p">;</span>
<span class="p">}</span> <span class="n">http2_session_data</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">app_context</span> <span class="p">{</span>
<span class="n">SSL_CTX</span> <span class="o">*</span><span class="n">ssl_ctx</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">event_base</span> <span class="o">*</span><span class="n">evbase</span><span class="p">;</span>
<span class="p">};</span>
<span class="k">static</span> <span class="kt">unsigned</span> <span class="kt">char</span> <span class="n">next_proto_list</span><span class="p">[</span><span class="mi">256</span><span class="p">];</span>
<span class="k">static</span> <span class="kt">size_t</span> <span class="n">next_proto_list_len</span><span class="p">;</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">next_proto_cb</span><span class="p">(</span><span class="n">SSL</span> <span class="o">*</span><span class="n">s</span> <span class="n">_U_</span><span class="p">,</span> <span class="k">const</span> <span class="kt">unsigned</span> <span class="kt">char</span> <span class="o">**</span><span class="n">data</span><span class="p">,</span>
<span class="kt">unsigned</span> <span class="kt">int</span> <span class="o">*</span><span class="n">len</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">arg</span> <span class="n">_U_</span><span class="p">)</span> <span class="p">{</span>
<span class="o">*</span><span class="n">data</span> <span class="o">=</span> <span class="n">next_proto_list</span><span class="p">;</span>
<span class="o">*</span><span class="n">len</span> <span class="o">=</span> <span class="p">(</span><span class="kt">unsigned</span> <span class="kt">int</span><span class="p">)</span><span class="n">next_proto_list_len</span><span class="p">;</span>
<span class="k">return</span> <span class="n">SSL_TLSEXT_ERR_OK</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* Create SSL_CTX. */</span>
<span class="k">static</span> <span class="n">SSL_CTX</span> <span class="o">*</span><span class="nf">create_ssl_ctx</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">key_file</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">cert_file</span><span class="p">)</span> <span class="p">{</span>
<span class="n">SSL_CTX</span> <span class="o">*</span><span class="n">ssl_ctx</span><span class="p">;</span>
<span class="n">EC_KEY</span> <span class="o">*</span><span class="n">ecdh</span><span class="p">;</span>
<span class="n">ssl_ctx</span> <span class="o">=</span> <span class="n">SSL_CTX_new</span><span class="p">(</span><span class="n">SSLv23_server_method</span><span class="p">());</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">ssl_ctx</span><span class="p">)</span> <span class="p">{</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">&quot;Could not create SSL/TLS context: %s&quot;</span><span class="p">,</span>
<span class="n">ERR_error_string</span><span class="p">(</span><span class="n">ERR_get_error</span><span class="p">(),</span> <span class="nb">NULL</span><span class="p">));</span>
<span class="p">}</span>
<span class="n">SSL_CTX_set_options</span><span class="p">(</span><span class="n">ssl_ctx</span><span class="p">,</span>
<span class="n">SSL_OP_ALL</span> <span class="o">|</span> <span class="n">SSL_OP_NO_SSLv2</span> <span class="o">|</span> <span class="n">SSL_OP_NO_SSLv3</span> <span class="o">|</span>
<span class="n">SSL_OP_NO_COMPRESSION</span> <span class="o">|</span>
<span class="n">SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION</span><span class="p">);</span>
<span class="n">ecdh</span> <span class="o">=</span> <span class="n">EC_KEY_new_by_curve_name</span><span class="p">(</span><span class="n">NID_X9_62_prime256v1</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">ecdh</span><span class="p">)</span> <span class="p">{</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">&quot;EC_KEY_new_by_curv_name failed: %s&quot;</span><span class="p">,</span>
<span class="n">ERR_error_string</span><span class="p">(</span><span class="n">ERR_get_error</span><span class="p">(),</span> <span class="nb">NULL</span><span class="p">));</span>
<span class="p">}</span>
<span class="n">SSL_CTX_set_tmp_ecdh</span><span class="p">(</span><span class="n">ssl_ctx</span><span class="p">,</span> <span class="n">ecdh</span><span class="p">);</span>
<span class="n">EC_KEY_free</span><span class="p">(</span><span class="n">ecdh</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">SSL_CTX_use_PrivateKey_file</span><span class="p">(</span><span class="n">ssl_ctx</span><span class="p">,</span> <span class="n">key_file</span><span class="p">,</span> <span class="n">SSL_FILETYPE_PEM</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">&quot;Could not read private key file %s&quot;</span><span class="p">,</span> <span class="n">key_file</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">SSL_CTX_use_certificate_chain_file</span><span class="p">(</span><span class="n">ssl_ctx</span><span class="p">,</span> <span class="n">cert_file</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">&quot;Could not read certificate file %s&quot;</span><span class="p">,</span> <span class="n">cert_file</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">next_proto_list</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="n">NGHTTP2_PROTO_VERSION_ID_LEN</span><span class="p">;</span>
<span class="n">memcpy</span><span class="p">(</span><span class="o">&amp;</span><span class="n">next_proto_list</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">NGHTTP2_PROTO_VERSION_ID</span><span class="p">,</span>
<span class="n">NGHTTP2_PROTO_VERSION_ID_LEN</span><span class="p">);</span>
<span class="n">next_proto_list_len</span> <span class="o">=</span> <span class="mi">1</span> <span class="o">+</span> <span class="n">NGHTTP2_PROTO_VERSION_ID_LEN</span><span class="p">;</span>
<span class="n">SSL_CTX_set_next_protos_advertised_cb</span><span class="p">(</span><span class="n">ssl_ctx</span><span class="p">,</span> <span class="n">next_proto_cb</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="k">return</span> <span class="n">ssl_ctx</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* Create SSL object */</span>
<span class="k">static</span> <span class="n">SSL</span> <span class="o">*</span><span class="nf">create_ssl</span><span class="p">(</span><span class="n">SSL_CTX</span> <span class="o">*</span><span class="n">ssl_ctx</span><span class="p">)</span> <span class="p">{</span>
<span class="n">SSL</span> <span class="o">*</span><span class="n">ssl</span><span class="p">;</span>
<span class="n">ssl</span> <span class="o">=</span> <span class="n">SSL_new</span><span class="p">(</span><span class="n">ssl_ctx</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">ssl</span><span class="p">)</span> <span class="p">{</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">&quot;Could not create SSL/TLS session object: %s&quot;</span><span class="p">,</span>
<span class="n">ERR_error_string</span><span class="p">(</span><span class="n">ERR_get_error</span><span class="p">(),</span> <span class="nb">NULL</span><span class="p">));</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">ssl</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">add_stream</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">,</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">next</span> <span class="o">=</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">root</span><span class="p">.</span><span class="n">next</span><span class="p">;</span>
<span class="n">session_data</span><span class="o">-&gt;</span><span class="n">root</span><span class="p">.</span><span class="n">next</span> <span class="o">=</span> <span class="n">stream_data</span><span class="p">;</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">prev</span> <span class="o">=</span> <span class="o">&amp;</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">root</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">next</span><span class="p">)</span> <span class="p">{</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">next</span><span class="o">-&gt;</span><span class="n">prev</span> <span class="o">=</span> <span class="n">stream_data</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">remove_stream</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="n">_U_</span><span class="p">,</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">prev</span><span class="o">-&gt;</span><span class="n">next</span> <span class="o">=</span> <span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">next</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">next</span><span class="p">)</span> <span class="p">{</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">next</span><span class="o">-&gt;</span><span class="n">prev</span> <span class="o">=</span> <span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">prev</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">static</span> <span class="n">http2_stream_data</span> <span class="o">*</span>
<span class="nf">create_http2_stream_data</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="n">stream_data</span> <span class="o">=</span> <span class="n">malloc</span><span class="p">(</span><span class="k">sizeof</span><span class="p">(</span><span class="n">http2_stream_data</span><span class="p">));</span>
<span class="n">memset</span><span class="p">(</span><span class="n">stream_data</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">http2_stream_data</span><span class="p">));</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">stream_id</span> <span class="o">=</span> <span class="n">stream_id</span><span class="p">;</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">fd</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="n">add_stream</span><span class="p">(</span><span class="n">session_data</span><span class="p">,</span> <span class="n">stream_data</span><span class="p">);</span>
<span class="k">return</span> <span class="n">stream_data</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">delete_http2_stream_data</span><span class="p">(</span><span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">fd</span> <span class="o">!=</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="n">close</span><span class="p">(</span><span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">fd</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">free</span><span class="p">(</span><span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span><span class="p">);</span>
<span class="n">free</span><span class="p">(</span><span class="n">stream_data</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">static</span> <span class="n">http2_session_data</span> <span class="o">*</span><span class="nf">create_http2_session_data</span><span class="p">(</span><span class="n">app_context</span> <span class="o">*</span><span class="n">app_ctx</span><span class="p">,</span>
<span class="kt">int</span> <span class="n">fd</span><span class="p">,</span>
<span class="k">struct</span> <span class="n">sockaddr</span> <span class="o">*</span><span class="n">addr</span><span class="p">,</span>
<span class="kt">int</span> <span class="n">addrlen</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">;</span>
<span class="n">SSL</span> <span class="o">*</span><span class="n">ssl</span><span class="p">;</span>
<span class="kt">char</span> <span class="n">host</span><span class="p">[</span><span class="n">NI_MAXHOST</span><span class="p">];</span>
<span class="kt">int</span> <span class="n">val</span> <span class="o">=</span> <span class="mi">1</span><span class="p">;</span>
<span class="n">ssl</span> <span class="o">=</span> <span class="n">create_ssl</span><span class="p">(</span><span class="n">app_ctx</span><span class="o">-&gt;</span><span class="n">ssl_ctx</span><span class="p">);</span>
<span class="n">session_data</span> <span class="o">=</span> <span class="n">malloc</span><span class="p">(</span><span class="k">sizeof</span><span class="p">(</span><span class="n">http2_session_data</span><span class="p">));</span>
<span class="n">memset</span><span class="p">(</span><span class="n">session_data</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">http2_session_data</span><span class="p">));</span>
<span class="n">session_data</span><span class="o">-&gt;</span><span class="n">app_ctx</span> <span class="o">=</span> <span class="n">app_ctx</span><span class="p">;</span>
<span class="n">setsockopt</span><span class="p">(</span><span class="n">fd</span><span class="p">,</span> <span class="n">IPPROTO_TCP</span><span class="p">,</span> <span class="n">TCP_NODELAY</span><span class="p">,</span> <span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="p">)</span><span class="o">&amp;</span><span class="n">val</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">val</span><span class="p">));</span>
<span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span> <span class="o">=</span> <span class="n">bufferevent_openssl_socket_new</span><span class="p">(</span>
<span class="n">app_ctx</span><span class="o">-&gt;</span><span class="n">evbase</span><span class="p">,</span> <span class="n">fd</span><span class="p">,</span> <span class="n">ssl</span><span class="p">,</span> <span class="n">BUFFEREVENT_SSL_ACCEPTING</span><span class="p">,</span>
<span class="n">BEV_OPT_CLOSE_ON_FREE</span> <span class="o">|</span> <span class="n">BEV_OPT_DEFER_CALLBACKS</span><span class="p">);</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">getnameinfo</span><span class="p">(</span><span class="n">addr</span><span class="p">,</span> <span class="n">addrlen</span><span class="p">,</span> <span class="n">host</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">host</span><span class="p">),</span> <span class="nb">NULL</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="n">NI_NUMERICHOST</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span> <span class="o">=</span> <span class="n">strdup</span><span class="p">(</span><span class="s">&quot;(unknown)&quot;</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span> <span class="o">=</span> <span class="n">strdup</span><span class="p">(</span><span class="n">host</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">session_data</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">delete_http2_session_data</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="n">SSL</span> <span class="o">*</span><span class="n">ssl</span> <span class="o">=</span> <span class="n">bufferevent_openssl_get_ssl</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">);</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s disconnected</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">ssl</span><span class="p">)</span> <span class="p">{</span>
<span class="n">SSL_shutdown</span><span class="p">(</span><span class="n">ssl</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">bufferevent_free</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">);</span>
<span class="n">nghttp2_session_del</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">);</span>
<span class="k">for</span> <span class="p">(</span><span class="n">stream_data</span> <span class="o">=</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">root</span><span class="p">.</span><span class="n">next</span><span class="p">;</span> <span class="n">stream_data</span><span class="p">;)</span> <span class="p">{</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">next</span> <span class="o">=</span> <span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">next</span><span class="p">;</span>
<span class="n">delete_http2_stream_data</span><span class="p">(</span><span class="n">stream_data</span><span class="p">);</span>
<span class="n">stream_data</span> <span class="o">=</span> <span class="n">next</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">free</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="n">free</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="p">}</span>
<span class="cm">/* Serialize the frame and send (or buffer) the data to</span>
<span class="cm"> bufferevent. */</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">session_send</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">nghttp2_session_send</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">(</span><span class="n">rv</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* Read the data in the bufferevent and feed them into nghttp2 library</span>
<span class="cm"> function. Invocation of nghttp2_session_mem_recv() may make</span>
<span class="cm"> additional pending frames, so call session_send() at the end of the</span>
<span class="cm"> function. */</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">session_recv</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">ssize_t</span> <span class="n">readlen</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">evbuffer</span> <span class="o">*</span><span class="n">input</span> <span class="o">=</span> <span class="n">bufferevent_get_input</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">);</span>
<span class="kt">size_t</span> <span class="n">datalen</span> <span class="o">=</span> <span class="n">evbuffer_get_length</span><span class="p">(</span><span class="n">input</span><span class="p">);</span>
<span class="kt">unsigned</span> <span class="kt">char</span> <span class="o">*</span><span class="n">data</span> <span class="o">=</span> <span class="n">evbuffer_pullup</span><span class="p">(</span><span class="n">input</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">);</span>
<span class="n">readlen</span> <span class="o">=</span> <span class="n">nghttp2_session_mem_recv</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">datalen</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">readlen</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">((</span><span class="kt">int</span><span class="p">)</span><span class="n">readlen</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">evbuffer_drain</span><span class="p">(</span><span class="n">input</span><span class="p">,</span> <span class="n">readlen</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: evbuffer_drain failed&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">session_send</span><span class="p">(</span><span class="n">session_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">ssize_t</span> <span class="nf">send_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span> <span class="n">_U_</span><span class="p">,</span> <span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">data</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">length</span><span class="p">,</span> <span class="kt">int</span> <span class="n">flags</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">user_data</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span> <span class="o">=</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">;</span>
<span class="cm">/* Avoid excessive buffering in server side. */</span>
<span class="k">if</span> <span class="p">(</span><span class="n">evbuffer_get_length</span><span class="p">(</span><span class="n">bufferevent_get_output</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">))</span> <span class="o">&gt;=</span>
<span class="n">OUTPUT_WOULDBLOCK_THRESHOLD</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">NGHTTP2_ERR_WOULDBLOCK</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">bufferevent_write</span><span class="p">(</span><span class="n">bev</span><span class="p">,</span> <span class="n">data</span><span class="p">,</span> <span class="n">length</span><span class="p">);</span>
<span class="k">return</span> <span class="n">length</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* Returns nonzero if the string |s| ends with the substring |sub| */</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">ends_with</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">s</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">sub</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">size_t</span> <span class="n">slen</span> <span class="o">=</span> <span class="n">strlen</span><span class="p">(</span><span class="n">s</span><span class="p">);</span>
<span class="kt">size_t</span> <span class="n">sublen</span> <span class="o">=</span> <span class="n">strlen</span><span class="p">(</span><span class="n">sub</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">slen</span> <span class="o">&lt;</span> <span class="n">sublen</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">memcmp</span><span class="p">(</span><span class="n">s</span> <span class="o">+</span> <span class="n">slen</span> <span class="o">-</span> <span class="n">sublen</span><span class="p">,</span> <span class="n">sub</span><span class="p">,</span> <span class="n">sublen</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* Returns int value of hex string character |c| */</span>
<span class="k">static</span> <span class="kt">uint8_t</span> <span class="nf">hex_to_uint</span><span class="p">(</span><span class="kt">uint8_t</span> <span class="n">c</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="sc">&#39;0&#39;</span> <span class="o">&lt;=</span> <span class="n">c</span> <span class="o">&amp;&amp;</span> <span class="n">c</span> <span class="o">&lt;=</span> <span class="sc">&#39;9&#39;</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">c</span> <span class="o">-</span> <span class="sc">&#39;0&#39;</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="sc">&#39;A&#39;</span> <span class="o">&lt;=</span> <span class="n">c</span> <span class="o">&amp;&amp;</span> <span class="n">c</span> <span class="o">&lt;=</span> <span class="sc">&#39;F&#39;</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">c</span> <span class="o">-</span> <span class="sc">&#39;A&#39;</span> <span class="o">+</span> <span class="mi">10</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="sc">&#39;a&#39;</span> <span class="o">&lt;=</span> <span class="n">c</span> <span class="o">&amp;&amp;</span> <span class="n">c</span> <span class="o">&lt;=</span> <span class="sc">&#39;f&#39;</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">c</span> <span class="o">-</span> <span class="sc">&#39;a&#39;</span> <span class="o">+</span> <span class="mi">10</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* Decodes percent-encoded byte string |value| with length |valuelen|</span>
<span class="cm"> and returns the decoded byte string in allocated buffer. The return</span>
<span class="cm"> value is NULL terminated. The caller must free the returned</span>
<span class="cm"> string. */</span>
<span class="k">static</span> <span class="kt">char</span> <span class="o">*</span><span class="nf">percent_decode</span><span class="p">(</span><span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">value</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">valuelen</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">char</span> <span class="o">*</span><span class="n">res</span><span class="p">;</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">malloc</span><span class="p">(</span><span class="n">valuelen</span> <span class="o">+</span> <span class="mi">1</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">valuelen</span> <span class="o">&gt;</span> <span class="mi">3</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">size_t</span> <span class="n">i</span><span class="p">,</span> <span class="n">j</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(</span><span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">j</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="n">valuelen</span> <span class="o">-</span> <span class="mi">2</span><span class="p">;)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">value</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">!=</span> <span class="sc">&#39;%&#39;</span> <span class="o">||</span> <span class="o">!</span><span class="n">isxdigit</span><span class="p">(</span><span class="n">value</span><span class="p">[</span><span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">])</span> <span class="o">||</span>
<span class="o">!</span><span class="n">isxdigit</span><span class="p">(</span><span class="n">value</span><span class="p">[</span><span class="n">i</span> <span class="o">+</span> <span class="mi">2</span><span class="p">]))</span> <span class="p">{</span>
<span class="n">res</span><span class="p">[</span><span class="n">j</span><span class="o">++</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span><span class="p">[</span><span class="n">i</span><span class="o">++</span><span class="p">];</span>
<span class="k">continue</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">res</span><span class="p">[</span><span class="n">j</span><span class="o">++</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">hex_to_uint</span><span class="p">(</span><span class="n">value</span><span class="p">[</span><span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">])</span> <span class="o">&lt;&lt;</span> <span class="mi">4</span><span class="p">)</span> <span class="o">+</span> <span class="n">hex_to_uint</span><span class="p">(</span><span class="n">value</span><span class="p">[</span><span class="n">i</span> <span class="o">+</span> <span class="mi">2</span><span class="p">]);</span>
<span class="n">i</span> <span class="o">+=</span> <span class="mi">3</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">memcpy</span><span class="p">(</span><span class="o">&amp;</span><span class="n">res</span><span class="p">[</span><span class="n">j</span><span class="p">],</span> <span class="o">&amp;</span><span class="n">value</span><span class="p">[</span><span class="n">i</span><span class="p">],</span> <span class="mi">2</span><span class="p">);</span>
<span class="n">res</span><span class="p">[</span><span class="n">j</span> <span class="o">+</span> <span class="mi">2</span><span class="p">]</span> <span class="o">=</span> <span class="sc">&#39;\0&#39;</span><span class="p">;</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="n">memcpy</span><span class="p">(</span><span class="n">res</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">valuelen</span><span class="p">);</span>
<span class="n">res</span><span class="p">[</span><span class="n">valuelen</span><span class="p">]</span> <span class="o">=</span> <span class="sc">&#39;\0&#39;</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">res</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">ssize_t</span> <span class="nf">file_read_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span> <span class="n">_U_</span><span class="p">,</span>
<span class="kt">int32_t</span> <span class="n">stream_id</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">length</span><span class="p">,</span> <span class="kt">uint32_t</span> <span class="o">*</span><span class="n">data_flags</span><span class="p">,</span>
<span class="n">nghttp2_data_source</span> <span class="o">*</span><span class="n">source</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span> <span class="n">_U_</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">fd</span> <span class="o">=</span> <span class="n">source</span><span class="o">-&gt;</span><span class="n">fd</span><span class="p">;</span>
<span class="kt">ssize_t</span> <span class="n">r</span><span class="p">;</span>
<span class="k">while</span> <span class="p">((</span><span class="n">r</span> <span class="o">=</span> <span class="n">read</span><span class="p">(</span><span class="n">fd</span><span class="p">,</span> <span class="n">buf</span><span class="p">,</span> <span class="n">length</span><span class="p">))</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span> <span class="o">&amp;&amp;</span> <span class="n">errno</span> <span class="o">==</span> <span class="n">EINTR</span><span class="p">)</span>
<span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">r</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">r</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="o">*</span><span class="n">data_flags</span> <span class="o">|=</span> <span class="n">NGHTTP2_DATA_FLAG_EOF</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">r</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">send_response</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="n">nghttp2_nv</span> <span class="o">*</span><span class="n">nva</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">nvlen</span><span class="p">,</span> <span class="kt">int</span> <span class="n">fd</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="n">nghttp2_data_provider</span> <span class="n">data_prd</span><span class="p">;</span>
<span class="n">data_prd</span><span class="p">.</span><span class="n">source</span><span class="p">.</span><span class="n">fd</span> <span class="o">=</span> <span class="n">fd</span><span class="p">;</span>
<span class="n">data_prd</span><span class="p">.</span><span class="n">read_callback</span> <span class="o">=</span> <span class="n">file_read_callback</span><span class="p">;</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">nghttp2_submit_response</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_id</span><span class="p">,</span> <span class="n">nva</span><span class="p">,</span> <span class="n">nvlen</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">data_prd</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">(</span><span class="n">rv</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">const</span> <span class="kt">char</span> <span class="n">ERROR_HTML</span><span class="p">[]</span> <span class="o">=</span> <span class="s">&quot;&lt;html&gt;&lt;head&gt;&lt;title&gt;404&lt;/title&gt;&lt;/head&gt;&quot;</span>
<span class="s">&quot;&lt;body&gt;&lt;h1&gt;404 Not Found&lt;/h1&gt;&lt;/body&gt;&lt;/html&gt;&quot;</span><span class="p">;</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">error_reply</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="kt">ssize_t</span> <span class="n">writelen</span><span class="p">;</span>
<span class="kt">int</span> <span class="n">pipefd</span><span class="p">[</span><span class="mi">2</span><span class="p">];</span>
<span class="n">nghttp2_nv</span> <span class="n">hdrs</span><span class="p">[]</span> <span class="o">=</span> <span class="p">{</span><span class="n">MAKE_NV</span><span class="p">(</span><span class="s">&quot;:status&quot;</span><span class="p">,</span> <span class="s">&quot;404&quot;</span><span class="p">)};</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">pipe</span><span class="p">(</span><span class="n">pipefd</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warn</span><span class="p">(</span><span class="s">&quot;Could not create pipe&quot;</span><span class="p">);</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">nghttp2_submit_rst_stream</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">NGHTTP2_FLAG_NONE</span><span class="p">,</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">stream_id</span><span class="p">,</span>
<span class="n">NGHTTP2_INTERNAL_ERROR</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">(</span><span class="n">rv</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">writelen</span> <span class="o">=</span> <span class="n">write</span><span class="p">(</span><span class="n">pipefd</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">ERROR_HTML</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">ERROR_HTML</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span><span class="p">);</span>
<span class="n">close</span><span class="p">(</span><span class="n">pipefd</span><span class="p">[</span><span class="mi">1</span><span class="p">]);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">writelen</span> <span class="o">!=</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">ERROR_HTML</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="n">close</span><span class="p">(</span><span class="n">pipefd</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">fd</span> <span class="o">=</span> <span class="n">pipefd</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span>
<span class="k">if</span> <span class="p">(</span><span class="n">send_response</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">stream_id</span><span class="p">,</span> <span class="n">hdrs</span><span class="p">,</span> <span class="n">ARRLEN</span><span class="p">(</span><span class="n">hdrs</span><span class="p">),</span>
<span class="n">pipefd</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">close</span><span class="p">(</span><span class="n">pipefd</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* nghttp2_on_header_callback: Called when nghttp2 library emits</span>
<span class="cm"> single header name/value pair. */</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">on_header_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">name</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">namelen</span><span class="p">,</span> <span class="k">const</span> <span class="kt">uint8_t</span> <span class="o">*</span><span class="n">value</span><span class="p">,</span>
<span class="kt">size_t</span> <span class="n">valuelen</span><span class="p">,</span> <span class="kt">uint8_t</span> <span class="n">flags</span> <span class="n">_U_</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span> <span class="n">_U_</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="k">const</span> <span class="kt">char</span> <span class="n">PATH</span><span class="p">[]</span> <span class="o">=</span> <span class="s">&quot;:path&quot;</span><span class="p">;</span>
<span class="k">switch</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">type</span><span class="p">)</span> <span class="p">{</span>
<span class="k">case</span> <span class="nl">NGHTTP2_HEADERS</span><span class="p">:</span>
<span class="k">if</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">headers</span><span class="p">.</span><span class="n">cat</span> <span class="o">!=</span> <span class="n">NGHTTP2_HCAT_REQUEST</span><span class="p">)</span> <span class="p">{</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">stream_data</span> <span class="o">=</span>
<span class="n">nghttp2_session_get_stream_user_data</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">stream_id</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">stream_data</span> <span class="o">||</span> <span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span><span class="p">)</span> <span class="p">{</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">namelen</span> <span class="o">==</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">PATH</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span> <span class="o">&amp;&amp;</span> <span class="n">memcmp</span><span class="p">(</span><span class="n">PATH</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">namelen</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">size_t</span> <span class="n">j</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(</span><span class="n">j</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">j</span> <span class="o">&lt;</span> <span class="n">valuelen</span> <span class="o">&amp;&amp;</span> <span class="n">value</span><span class="p">[</span><span class="n">j</span><span class="p">]</span> <span class="o">!=</span> <span class="sc">&#39;?&#39;</span><span class="p">;</span> <span class="o">++</span><span class="n">j</span><span class="p">)</span>
<span class="p">;</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span> <span class="o">=</span> <span class="n">percent_decode</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">j</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">on_begin_headers_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span>
<span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">user_data</span><span class="p">;</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">type</span> <span class="o">!=</span> <span class="n">NGHTTP2_HEADERS</span> <span class="o">||</span>
<span class="n">frame</span><span class="o">-&gt;</span><span class="n">headers</span><span class="p">.</span><span class="n">cat</span> <span class="o">!=</span> <span class="n">NGHTTP2_HCAT_REQUEST</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">stream_data</span> <span class="o">=</span> <span class="n">create_http2_stream_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">,</span> <span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">stream_id</span><span class="p">);</span>
<span class="n">nghttp2_session_set_stream_user_data</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">stream_id</span><span class="p">,</span>
<span class="n">stream_data</span><span class="p">);</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* Minimum check for directory traversal. Returns nonzero if it is</span>
<span class="cm"> safe. */</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">check_path</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">path</span><span class="p">)</span> <span class="p">{</span>
<span class="cm">/* We don&#39;t like &#39;\&#39; in url. */</span>
<span class="k">return</span> <span class="n">path</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">&amp;&amp;</span> <span class="n">path</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">==</span> <span class="sc">&#39;/&#39;</span> <span class="o">&amp;&amp;</span> <span class="n">strchr</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="sc">&#39;\\&#39;</span><span class="p">)</span> <span class="o">==</span> <span class="nb">NULL</span> <span class="o">&amp;&amp;</span>
<span class="n">strstr</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">&quot;/../&quot;</span><span class="p">)</span> <span class="o">==</span> <span class="nb">NULL</span> <span class="o">&amp;&amp;</span> <span class="n">strstr</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">&quot;/./&quot;</span><span class="p">)</span> <span class="o">==</span> <span class="nb">NULL</span> <span class="o">&amp;&amp;</span>
<span class="o">!</span><span class="n">ends_with</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">&quot;/..&quot;</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="o">!</span><span class="n">ends_with</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">&quot;/.&quot;</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">on_request_recv</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">,</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">fd</span><span class="p">;</span>
<span class="n">nghttp2_nv</span> <span class="n">hdrs</span><span class="p">[]</span> <span class="o">=</span> <span class="p">{</span><span class="n">MAKE_NV</span><span class="p">(</span><span class="s">&quot;:status&quot;</span><span class="p">,</span> <span class="s">&quot;200&quot;</span><span class="p">)};</span>
<span class="kt">char</span> <span class="o">*</span><span class="n">rel_path</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">error_reply</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">NGHTTP2_ERR_CALLBACK_FAILURE</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s GET %s</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">,</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">check_path</span><span class="p">(</span><span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span><span class="p">))</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">error_reply</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">NGHTTP2_ERR_CALLBACK_FAILURE</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">for</span> <span class="p">(</span><span class="n">rel_path</span> <span class="o">=</span> <span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">request_path</span><span class="p">;</span> <span class="o">*</span><span class="n">rel_path</span> <span class="o">==</span> <span class="sc">&#39;/&#39;</span><span class="p">;</span> <span class="o">++</span><span class="n">rel_path</span><span class="p">)</span>
<span class="p">;</span>
<span class="n">fd</span> <span class="o">=</span> <span class="n">open</span><span class="p">(</span><span class="n">rel_path</span><span class="p">,</span> <span class="n">O_RDONLY</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">fd</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">error_reply</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">NGHTTP2_ERR_CALLBACK_FAILURE</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">fd</span> <span class="o">=</span> <span class="n">fd</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">send_response</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_data</span><span class="o">-&gt;</span><span class="n">stream_id</span><span class="p">,</span> <span class="n">hdrs</span><span class="p">,</span> <span class="n">ARRLEN</span><span class="p">(</span><span class="n">hdrs</span><span class="p">),</span> <span class="n">fd</span><span class="p">)</span> <span class="o">!=</span>
<span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">close</span><span class="p">(</span><span class="n">fd</span><span class="p">);</span>
<span class="k">return</span> <span class="n">NGHTTP2_ERR_CALLBACK_FAILURE</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">on_frame_recv_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span>
<span class="k">const</span> <span class="n">nghttp2_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">user_data</span><span class="p">;</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="k">switch</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">type</span><span class="p">)</span> <span class="p">{</span>
<span class="k">case</span> <span class="nl">NGHTTP2_DATA</span><span class="p">:</span>
<span class="k">case</span> <span class="nl">NGHTTP2_HEADERS</span><span class="p">:</span>
<span class="cm">/* Check that the client request has finished */</span>
<span class="k">if</span> <span class="p">(</span><span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">flags</span> <span class="o">&amp;</span> <span class="n">NGHTTP2_FLAG_END_STREAM</span><span class="p">)</span> <span class="p">{</span>
<span class="n">stream_data</span> <span class="o">=</span>
<span class="n">nghttp2_session_get_stream_user_data</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">frame</span><span class="o">-&gt;</span><span class="n">hd</span><span class="p">.</span><span class="n">stream_id</span><span class="p">);</span>
<span class="cm">/* For DATA and HEADERS frame, this callback may be called after</span>
<span class="cm"> on_stream_close_callback. Check that stream still alive. */</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">on_request_recv</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">session_data</span><span class="p">,</span> <span class="n">stream_data</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">break</span><span class="p">;</span>
<span class="k">default</span><span class="o">:</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">on_stream_close_callback</span><span class="p">(</span><span class="n">nghttp2_session</span> <span class="o">*</span><span class="n">session</span><span class="p">,</span> <span class="kt">int32_t</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="kt">uint32_t</span> <span class="n">error_code</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">user_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">user_data</span><span class="p">;</span>
<span class="n">http2_stream_data</span> <span class="o">*</span><span class="n">stream_data</span><span class="p">;</span>
<span class="n">stream_data</span> <span class="o">=</span> <span class="n">nghttp2_session_get_stream_user_data</span><span class="p">(</span><span class="n">session</span><span class="p">,</span> <span class="n">stream_id</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">stream_data</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">remove_stream</span><span class="p">(</span><span class="n">session_data</span><span class="p">,</span> <span class="n">stream_data</span><span class="p">);</span>
<span class="n">delete_http2_stream_data</span><span class="p">(</span><span class="n">stream_data</span><span class="p">);</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">initialize_nghttp2_session</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">nghttp2_option</span> <span class="o">*</span><span class="n">option</span><span class="p">;</span>
<span class="n">nghttp2_session_callbacks</span> <span class="o">*</span><span class="n">callbacks</span><span class="p">;</span>
<span class="n">nghttp2_option_new</span><span class="p">(</span><span class="o">&amp;</span><span class="n">option</span><span class="p">);</span>
<span class="cm">/* Tells nghttp2_session object that it handles client connection</span>
<span class="cm"> preface */</span>
<span class="n">nghttp2_option_set_recv_client_preface</span><span class="p">(</span><span class="n">option</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_new</span><span class="p">(</span><span class="o">&amp;</span><span class="n">callbacks</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_send_callback</span><span class="p">(</span><span class="n">callbacks</span><span class="p">,</span> <span class="n">send_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_on_frame_recv_callback</span><span class="p">(</span><span class="n">callbacks</span><span class="p">,</span>
<span class="n">on_frame_recv_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_on_stream_close_callback</span><span class="p">(</span>
<span class="n">callbacks</span><span class="p">,</span> <span class="n">on_stream_close_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_on_header_callback</span><span class="p">(</span><span class="n">callbacks</span><span class="p">,</span>
<span class="n">on_header_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_set_on_begin_headers_callback</span><span class="p">(</span>
<span class="n">callbacks</span><span class="p">,</span> <span class="n">on_begin_headers_callback</span><span class="p">);</span>
<span class="n">nghttp2_session_server_new2</span><span class="p">(</span><span class="o">&amp;</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">,</span> <span class="n">callbacks</span><span class="p">,</span> <span class="n">session_data</span><span class="p">,</span>
<span class="n">option</span><span class="p">);</span>
<span class="n">nghttp2_session_callbacks_del</span><span class="p">(</span><span class="n">callbacks</span><span class="p">);</span>
<span class="n">nghttp2_option_del</span><span class="p">(</span><span class="n">option</span><span class="p">);</span>
<span class="p">}</span>
<span class="cm">/* Send HTTP/2 client connection header, which includes 24 bytes</span>
<span class="cm"> magic octets and SETTINGS frame */</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">send_server_connection_header</span><span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">)</span> <span class="p">{</span>
<span class="n">nghttp2_settings_entry</span> <span class="n">iv</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="p">{</span>
<span class="p">{</span><span class="n">NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS</span><span class="p">,</span> <span class="mi">100</span><span class="p">}};</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">nghttp2_submit_settings</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">,</span> <span class="n">NGHTTP2_FLAG_NONE</span><span class="p">,</span> <span class="n">iv</span><span class="p">,</span>
<span class="n">ARRLEN</span><span class="p">(</span><span class="n">iv</span><span class="p">));</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">warnx</span><span class="p">(</span><span class="s">&quot;Fatal error: %s&quot;</span><span class="p">,</span> <span class="n">nghttp2_strerror</span><span class="p">(</span><span class="n">rv</span><span class="p">));</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
<span class="cm">/* readcb for bufferevent after client connection header was</span>
<span class="cm"> checked. */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">readcb</span><span class="p">(</span><span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">ptr</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">ptr</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">session_recv</span><span class="p">(</span><span class="n">session_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="cm">/* writecb for bufferevent. To greaceful shutdown after sending or</span>
<span class="cm"> receiving GOAWAY, we check the some conditions on the nghttp2</span>
<span class="cm"> library and output buffer of bufferevent. If it indicates we have</span>
<span class="cm"> no business to this session, tear down the connection. If the</span>
<span class="cm"> connection is not going to shutdown, we call session_send() to</span>
<span class="cm"> process pending data in the output buffer. This is necessary</span>
<span class="cm"> because we have a threshold on the buffer size to avoid too much</span>
<span class="cm"> buffering. See send_callback(). */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">writecb</span><span class="p">(</span><span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">ptr</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">ptr</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">evbuffer_get_length</span><span class="p">(</span><span class="n">bufferevent_get_output</span><span class="p">(</span><span class="n">bev</span><span class="p">))</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">nghttp2_session_want_read</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span> <span class="o">&amp;&amp;</span>
<span class="n">nghttp2_session_want_write</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">session</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">session_send</span><span class="p">(</span><span class="n">session_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="cm">/* eventcb for bufferevent */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">eventcb</span><span class="p">(</span><span class="k">struct</span> <span class="n">bufferevent</span> <span class="o">*</span><span class="n">bev</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">short</span> <span class="n">events</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">ptr</span><span class="p">)</span> <span class="p">{</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span> <span class="o">=</span> <span class="p">(</span><span class="n">http2_session_data</span> <span class="o">*</span><span class="p">)</span><span class="n">ptr</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">events</span> <span class="o">&amp;</span> <span class="n">BEV_EVENT_CONNECTED</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s connected</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="n">initialize_nghttp2_session</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">send_server_connection_header</span><span class="p">(</span><span class="n">session_data</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">events</span> <span class="o">&amp;</span> <span class="n">BEV_EVENT_EOF</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s EOF</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">events</span> <span class="o">&amp;</span> <span class="n">BEV_EVENT_ERROR</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s network error</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">events</span> <span class="o">&amp;</span> <span class="n">BEV_EVENT_TIMEOUT</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s timeout</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">session_data</span><span class="o">-&gt;</span><span class="n">client_addr</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">delete_http2_session_data</span><span class="p">(</span><span class="n">session_data</span><span class="p">);</span>
<span class="p">}</span>
<span class="cm">/* callback for evconnlistener */</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">acceptcb</span><span class="p">(</span><span class="k">struct</span> <span class="n">evconnlistener</span> <span class="o">*</span><span class="n">listener</span> <span class="n">_U_</span><span class="p">,</span> <span class="kt">int</span> <span class="n">fd</span><span class="p">,</span>
<span class="k">struct</span> <span class="n">sockaddr</span> <span class="o">*</span><span class="n">addr</span><span class="p">,</span> <span class="kt">int</span> <span class="n">addrlen</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">arg</span><span class="p">)</span> <span class="p">{</span>
<span class="n">app_context</span> <span class="o">*</span><span class="n">app_ctx</span> <span class="o">=</span> <span class="p">(</span><span class="n">app_context</span> <span class="o">*</span><span class="p">)</span><span class="n">arg</span><span class="p">;</span>
<span class="n">http2_session_data</span> <span class="o">*</span><span class="n">session_data</span><span class="p">;</span>
<span class="n">session_data</span> <span class="o">=</span> <span class="n">create_http2_session_data</span><span class="p">(</span><span class="n">app_ctx</span><span class="p">,</span> <span class="n">fd</span><span class="p">,</span> <span class="n">addr</span><span class="p">,</span> <span class="n">addrlen</span><span class="p">);</span>
<span class="n">bufferevent_setcb</span><span class="p">(</span><span class="n">session_data</span><span class="o">-&gt;</span><span class="n">bev</span><span class="p">,</span> <span class="n">readcb</span><span class="p">,</span> <span class="n">writecb</span><span class="p">,</span> <span class="n">eventcb</span><span class="p">,</span> <span class="n">session_data</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">start_listen</span><span class="p">(</span><span class="k">struct</span> <span class="n">event_base</span> <span class="o">*</span><span class="n">evbase</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">service</span><span class="p">,</span>
<span class="n">app_context</span> <span class="o">*</span><span class="n">app_ctx</span><span class="p">)</span> <span class="p">{</span>
<span class="kt">int</span> <span class="n">rv</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">addrinfo</span> <span class="n">hints</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">addrinfo</span> <span class="o">*</span><span class="n">res</span><span class="p">,</span> <span class="o">*</span><span class="n">rp</span><span class="p">;</span>
<span class="n">memset</span><span class="p">(</span><span class="o">&amp;</span><span class="n">hints</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">hints</span><span class="p">));</span>
<span class="n">hints</span><span class="p">.</span><span class="n">ai_family</span> <span class="o">=</span> <span class="n">AF_UNSPEC</span><span class="p">;</span>
<span class="n">hints</span><span class="p">.</span><span class="n">ai_socktype</span> <span class="o">=</span> <span class="n">SOCK_STREAM</span><span class="p">;</span>
<span class="n">hints</span><span class="p">.</span><span class="n">ai_flags</span> <span class="o">=</span> <span class="n">AI_PASSIVE</span><span class="p">;</span>
<span class="cp">#ifdef AI_ADDRCONFIG</span>
<span class="n">hints</span><span class="p">.</span><span class="n">ai_flags</span> <span class="o">|=</span> <span class="n">AI_ADDRCONFIG</span><span class="p">;</span>
<span class="cp">#endif </span><span class="cm">/* AI_ADDRCONFIG */</span><span class="cp"></span>
<span class="n">rv</span> <span class="o">=</span> <span class="n">getaddrinfo</span><span class="p">(</span><span class="nb">NULL</span><span class="p">,</span> <span class="n">service</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">hints</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">res</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rv</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">for</span> <span class="p">(</span><span class="n">rp</span> <span class="o">=</span> <span class="n">res</span><span class="p">;</span> <span class="n">rp</span><span class="p">;</span> <span class="n">rp</span> <span class="o">=</span> <span class="n">rp</span><span class="o">-&gt;</span><span class="n">ai_next</span><span class="p">)</span> <span class="p">{</span>
<span class="k">struct</span> <span class="n">evconnlistener</span> <span class="o">*</span><span class="n">listener</span><span class="p">;</span>
<span class="n">listener</span> <span class="o">=</span> <span class="n">evconnlistener_new_bind</span><span class="p">(</span>
<span class="n">evbase</span><span class="p">,</span> <span class="n">acceptcb</span><span class="p">,</span> <span class="n">app_ctx</span><span class="p">,</span> <span class="n">LEV_OPT_CLOSE_ON_FREE</span> <span class="o">|</span> <span class="n">LEV_OPT_REUSEABLE</span><span class="p">,</span>
<span class="mi">16</span><span class="p">,</span> <span class="n">rp</span><span class="o">-&gt;</span><span class="n">ai_addr</span><span class="p">,</span> <span class="n">rp</span><span class="o">-&gt;</span><span class="n">ai_addrlen</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">listener</span><span class="p">)</span> <span class="p">{</span>
<span class="n">freeaddrinfo</span><span class="p">(</span><span class="n">res</span><span class="p">);</span>
<span class="k">return</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="n">errx</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s">&quot;Could not start listener&quot;</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">initialize_app_context</span><span class="p">(</span><span class="n">app_context</span> <span class="o">*</span><span class="n">app_ctx</span><span class="p">,</span> <span class="n">SSL_CTX</span> <span class="o">*</span><span class="n">ssl_ctx</span><span class="p">,</span>
<span class="k">struct</span> <span class="n">event_base</span> <span class="o">*</span><span class="n">evbase</span><span class="p">)</span> <span class="p">{</span>
<span class="n">memset</span><span class="p">(</span><span class="n">app_ctx</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">app_context</span><span class="p">));</span>
<span class="n">app_ctx</span><span class="o">-&gt;</span><span class="n">ssl_ctx</span> <span class="o">=</span> <span class="n">ssl_ctx</span><span class="p">;</span>
<span class="n">app_ctx</span><span class="o">-&gt;</span><span class="n">evbase</span> <span class="o">=</span> <span class="n">evbase</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">run</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">service</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">key_file</span><span class="p">,</span>
<span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">cert_file</span><span class="p">)</span> <span class="p">{</span>
<span class="n">SSL_CTX</span> <span class="o">*</span><span class="n">ssl_ctx</span><span class="p">;</span>
<span class="n">app_context</span> <span class="n">app_ctx</span><span class="p">;</span>
<span class="k">struct</span> <span class="n">event_base</span> <span class="o">*</span><span class="n">evbase</span><span class="p">;</span>
<span class="n">ssl_ctx</span> <span class="o">=</span> <span class="n">create_ssl_ctx</span><span class="p">(</span><span class="n">key_file</span><span class="p">,</span> <span class="n">cert_file</span><span class="p">);</span>
<span class="n">evbase</span> <span class="o">=</span> <span class="n">event_base_new</span><span class="p">();</span>
<span class="n">initialize_app_context</span><span class="p">(</span><span class="o">&amp;</span><span class="n">app_ctx</span><span class="p">,</span> <span class="n">ssl_ctx</span><span class="p">,</span> <span class="n">evbase</span><span class="p">);</span>
<span class="n">start_listen</span><span class="p">(</span><span class="n">evbase</span><span class="p">,</span> <span class="n">service</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">app_ctx</span><span class="p">);</span>
<span class="n">event_base_loop</span><span class="p">(</span><span class="n">evbase</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span>
<span class="n">event_base_free</span><span class="p">(</span><span class="n">evbase</span><span class="p">);</span>
<span class="n">SSL_CTX_free</span><span class="p">(</span><span class="n">ssl_ctx</span><span class="p">);</span>
<span class="p">}</span>
<span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">**</span><span class="n">argv</span><span class="p">)</span> <span class="p">{</span>
<span class="k">struct</span> <span class="n">sigaction</span> <span class="n">act</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">argc</span> <span class="o">&lt;</span> <span class="mi">4</span><span class="p">)</span> <span class="p">{</span>
<span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;Usage: libevent-server PORT KEY_FILE CERT_FILE</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">);</span>
<span class="n">exit</span><span class="p">(</span><span class="n">EXIT_FAILURE</span><span class="p">);</span>
<span class="p">}</span>
<span class="n">memset</span><span class="p">(</span><span class="o">&amp;</span><span class="n">act</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">sigaction</span><span class="p">));</span>
<span class="n">act</span><span class="p">.</span><span class="n">sa_handler</span> <span class="o">=</span> <span class="n">SIG_IGN</span><span class="p">;</span>
<span class="n">sigaction</span><span class="p">(</span><span class="n">SIGPIPE</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">act</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="n">OPENSSL_config</span><span class="p">(</span><span class="nb">NULL</span><span class="p">);</span>
<span class="n">OpenSSL_add_all_algorithms</span><span class="p">();</span>
<span class="n">SSL_load_error_strings</span><span class="p">();</span>
<span class="n">SSL_library_init</span><span class="p">();</span>
<span class="n">run</span><span class="p">(</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">argv</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">argv</span><span class="p">[</span><span class="mi">3</span><span class="p">]);</span>
<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
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