src: Add utility APIs to asio_http2.h; add asio-sv2 example to serve files

examples/Makefile.am

@@ -51,15 +51,24 @@ deflate_SOURCES = deflate.c
 
 if ENABLE_ASIO_LIB
 
-noinst_PROGRAMS += asio-sv
+noinst_PROGRAMS += asio-sv asio-sv2
 
-asio_sv_SOURCES = asio-sv.cc
-asio_sv_CPPFLAGS = ${BOOST_CPPFLAGS} ${AM_CPPFLAGS}
-asio_sv_LDFLAGS = \
+ASIOCPPFLAGS = ${BOOST_CPPFLAGS} ${AM_CPPFLAGS}
+ASIOLDFLAGS = \
 	@JEMALLOC_LIBS@ \
 	${BOOST_LDFLAGS} \
 	${BOOST_SYSTEM_LIB}
-asio_sv_LDADD = $(top_builddir)/src/libnghttp2_asio.la
+ASIOLDADD = $(top_builddir)/src/libnghttp2_asio.la
+
+asio_sv_SOURCES = asio-sv.cc
+asio_sv_CPPFLAGS = ${ASIOCPPFLAGS}
+asio_sv_LDFLAGS = ${ASIOLDFLAGS}
+asio_sv_LDADD = ${ASIOLDADD}
+
+asio_sv2_SOURCES = asio-sv2.cc
+asio_sv2_CPPFLAGS = ${ASIOCPPFLAGS}
+asio_sv2_LDFLAGS = ${ASIOLDFLAGS}
+asio_sv2_LDADD = ${ASIOLDADD}
 
 endif # ENABLE_ASIO_LIB
 

examples/asio-sv2.cc

@@ -0,0 +1,110 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2014 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+// We wrote this code based on the original code which has the
+// following license:
+//
+// main.cpp
+// ~~~~~~~~
+//
+// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <iostream>
+#include <string>
+
+#include <nghttp2/asio_http2.h>
+
+using namespace nghttp2::asio_http2;
+using namespace nghttp2::asio_http2::server;
+
+int main(int argc, char* argv[])
+{
+  try {
+    // Check command line arguments.
+    if (argc < 4) {
+      std::cerr << "Usage: asio-sv2 <port> <threads> <doc-root> "
+                << "<private-key-file> <cert-file>\n";
+      return 1;
+    }
+
+    uint16_t port = std::stoi(argv[1]);
+    std::size_t num_threads = std::stoi(argv[2]);
+    std::string docroot = argv[3];
+
+    http2 server;
+
+    server.num_threads(num_threads);
+
+    if(argc >= 6) {
+      server.tls(argv[4], argv[5]);
+    }
+
+    server.listen
+      ("*", port,
+       [&docroot](std::shared_ptr<request> req, std::shared_ptr<response> res)
+       {
+         auto path = percent_decode(req->path());
+         if(!check_path(path)) {
+           res->write_head(404);
+           res->end();
+           return;
+         }
+
+         if(path == "/") {
+           path = "/index.html";
+         }
+
+         path = docroot + path;
+         auto fd = open(path.c_str(), O_RDONLY);
+         if(fd == -1) {
+           res->write_head(404);
+           res->end();
+           return;
+         }
+
+         auto headers = std::vector<header>();
+
+         struct stat stbuf;
+         if(stat(path.c_str(), &stbuf) == 0) {
+           headers.push_back
+             (header{"content-length", std::to_string(stbuf.st_size)});
+           headers.push_back
+             (header{"last-modified", http_date(stbuf.st_mtim.tv_sec)});
+         }
+         res->write_head(200, std::move(headers));
+         res->end(file_reader_from_fd(fd));
+       });
+  } catch (std::exception& e) {
+    std::cerr << "exception: " << e.what() << "\n";
+  }
+
+  return 0;
+}

src/HttpServer.cc

@@ -796,18 +796,6 @@ ssize_t file_read_callback
   return nread;
 }
 
-namespace {
-bool check_url(const std::string& url)
-{
-  // We don't like '\' in url.
-  return !url.empty() && url[0] == '/' &&
-    url.find('\\') == std::string::npos &&
-    url.find("/../") == std::string::npos &&
-    url.find("/./") == std::string::npos &&
-    !util::endsWith(url, "/..") && !util::endsWith(url, "/.");
-}
-} // namespace
-
 namespace {
 void prepare_status_response(Stream *stream, Http2Handler *hd,
                              const std::string& status)
@@ -885,7 +873,7 @@ void prepare_response(Stream *stream, Http2Handler *hd, bool allow_push = true)
     url = url.substr(0, query_pos);
   }
   url = util::percentDecode(url.begin(), url.end());
-  if(!check_url(url)) {
+  if(!util::check_path(url)) {
     prepare_status_response(stream, hd, STATUS_404);
     return;
   }

src/asio_http2_impl.cc

@@ -155,6 +155,11 @@ read_cb file_reader(const std::string& path)
     return read_cb();
   }
 
+  return file_reader_from_fd(fd);
+}
+
+read_cb file_reader_from_fd(int fd)
+{
   auto d = defer_shared(static_cast<int>(fd), close);
 
   return [fd, d](uint8_t *buf, size_t len) -> read_cb::result_type
@@ -174,6 +179,21 @@ read_cb file_reader(const std::string& path)
     };
 }
 
+bool check_path(const std::string& path)
+{
+  return util::check_path(path);
+}
+
+std::string percent_decode(const std::string& s)
+{
+  return util::percentDecode(std::begin(s), std::end(s));
+}
+
+std::string http_date(time_t t)
+{
+  return util::http_date(t);
+}
+
 } // namespace server
 
 } // namespace asio_http2

src/includes/nghttp2/asio_http2.h

@@ -168,6 +168,23 @@ private:
 // |path|.  This can be passed to response::end().
 read_cb file_reader(const std::string& path);
 
+// Like file_reader(const std::string&), but it takes opened file
+// descriptor.  The passed descriptor will be closed when returned
+// function object is destroyed.
+read_cb file_reader_from_fd(int fd);
+
+// Validates path so that it does not contain directory traversal
+// vector.  Returns true if path is safe.  The |path| must start with
+// "/" otherwise returns false.  This function should be called after
+// percent-decode was performed.
+bool check_path(const std::string& path);
+
+// Performs percent-decode against string |s|.
+std::string percent_decode(const std::string& s);
+
+// Returns HTTP date representation of current posix time |t|.
+std::string http_date(time_t t);
+
 } // namespace server
 
 } // namespace asio_http2

src/util.cc

@@ -593,6 +593,16 @@ char* get_exec_path(int argc, char **const argv, const char *cwd)
   return path;
 }
 
+bool check_path(const std::string& path)
+{
+  // We don't like '\' in path.
+  return !path.empty() && path[0] == '/' &&
+    path.find('\\') == std::string::npos &&
+    path.find("/../") == std::string::npos &&
+    path.find("/./") == std::string::npos &&
+    !util::endsWith(path, "/..") && !util::endsWith(path, "/.");
+}
+
 } // namespace util
 
 } // namespace nghttp2

src/util.h

@@ -464,6 +464,12 @@ std::string ascii_dump(const uint8_t *data, size_t len);
 // it.
 char* get_exec_path(int argc, char **const argv, const char *cwd);
 
+// Validates path so that it does not contain directory traversal
+// vector.  Returns true if path is safe.  The |path| must start with
+// "/" otherwise returns false.  This function should be called after
+// percent-decode was performed.
+bool check_path(const std::string& path);
+
 } // namespace util
 
 } // namespace nghttp2