nghttp2/src/http2.cc

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/*
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* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 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.
*/
#include "http2.h"
#include "util.h"
namespace nghttp2 {
namespace http2 {
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std::string get_status_string(unsigned int status_code) {
switch (status_code) {
case 100:
return "100 Continue";
case 101:
return "101 Switching Protocols";
case 200:
return "200 OK";
case 201:
return "201 Created";
case 202:
return "202 Accepted";
case 203:
return "203 Non-Authoritative Information";
case 204:
return "204 No Content";
case 205:
return "205 Reset Content";
case 206:
return "206 Partial Content";
case 300:
return "300 Multiple Choices";
case 301:
return "301 Moved Permanently";
case 302:
return "302 Found";
case 303:
return "303 See Other";
case 304:
return "304 Not Modified";
case 305:
return "305 Use Proxy";
// case 306: return "306 (Unused)";
case 307:
return "307 Temporary Redirect";
case 308:
return "308 Permanent Redirect";
case 400:
return "400 Bad Request";
case 401:
return "401 Unauthorized";
case 402:
return "402 Payment Required";
case 403:
return "403 Forbidden";
case 404:
return "404 Not Found";
case 405:
return "405 Method Not Allowed";
case 406:
return "406 Not Acceptable";
case 407:
return "407 Proxy Authentication Required";
case 408:
return "408 Request Timeout";
case 409:
return "409 Conflict";
case 410:
return "410 Gone";
case 411:
return "411 Length Required";
case 412:
return "412 Precondition Failed";
case 413:
return "413 Payload Too Large";
case 414:
return "414 URI Too Long";
case 415:
return "415 Unsupported Media Type";
case 416:
return "416 Requested Range Not Satisfiable";
case 417:
return "417 Expectation Failed";
case 421:
return "421 Misdirected Request";
case 426:
return "426 Upgrade Required";
case 428:
return "428 Precondition Required";
case 429:
return "429 Too Many Requests";
case 431:
return "431 Request Header Fields Too Large";
case 500:
return "500 Internal Server Error";
case 501:
return "501 Not Implemented";
case 502:
return "502 Bad Gateway";
case 503:
return "503 Service Unavailable";
case 504:
return "504 Gateway Timeout";
case 505:
return "505 HTTP Version Not Supported";
case 511:
return "511 Network Authentication Required";
default:
return util::utos(status_code);
}
}
void capitalize(std::string &s, size_t offset) {
s[offset] = util::upcase(s[offset]);
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for (size_t i = offset + 1, eoi = s.size(); i < eoi; ++i) {
if (s[i - 1] == '-') {
s[i] = util::upcase(s[i]);
} else {
s[i] = util::lowcase(s[i]);
}
}
}
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bool lws(const char *value) {
for (; *value; ++value) {
switch (*value) {
case '\t':
case ' ':
continue;
default:
return false;
}
}
return true;
}
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void sanitize_header_value(std::string &s, size_t offset) {
// Since both nghttp2 and spdylay do not allow \n and \r in header
// values, we don't have to do this anymore.
// for(size_t i = offset, eoi = s.size(); i < eoi; ++i) {
// if(s[i] == '\r' || s[i] == '\n') {
// s[i] = ' ';
// }
// }
}
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void copy_url_component(std::string &dest, const http_parser_url *u, int field,
const char *url) {
if (u->field_set & (1 << field)) {
dest.assign(url + u->field_data[field].off, u->field_data[field].len);
}
}
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bool check_http2_allowed_header(const char *name) {
return check_http2_allowed_header(reinterpret_cast<const uint8_t *>(name),
strlen(name));
}
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bool check_http2_allowed_header(const uint8_t *name, size_t namelen) {
return !util::strieq("connection", name, namelen) &&
!util::strieq("host", name, namelen) &&
!util::strieq("keep-alive", name, namelen) &&
!util::strieq("proxy-connection", name, namelen) &&
!util::strieq("te", name, namelen) &&
!util::strieq("transfer-encoding", name, namelen) &&
!util::strieq("upgrade", name, namelen);
}
namespace {
const char *DISALLOWED_HD[] = {
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"connection", "keep-alive", "proxy-connection",
"te", "transfer-encoding", "upgrade",
};
} // namespace
namespace {
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auto DISALLOWED_HDLEN = util::array_size(DISALLOWED_HD);
} // namespace
namespace {
const char *REQUEST_PSEUDO_HD[] = {
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":authority", ":method", ":path", ":scheme",
};
} // namespace
namespace {
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auto REQUEST_PSEUDO_HDLEN = util::array_size(REQUEST_PSEUDO_HD);
} // namespace
namespace {
const char *RESPONSE_PSEUDO_HD[] = {
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":status",
};
} // namespace
namespace {
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auto RESPONSE_PSEUDO_HDLEN = util::array_size(RESPONSE_PSEUDO_HD);
} // namespace
namespace {
const char *IGN_HD[] = {
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"connection", "http2-settings", "keep-alive", "proxy-connection",
"server", "te", "transfer-encoding", "upgrade",
"via", "x-forwarded-for", "x-forwarded-proto",
};
} // namespace
namespace {
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auto IGN_HDLEN = util::array_size(IGN_HD);
} // namespace
namespace {
const char *HTTP1_IGN_HD[] = {
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"connection", "cookie", "http2-settings", "keep-alive",
"proxy-connection", "server", "upgrade", "via",
"x-forwarded-for", "x-forwarded-proto",
};
} // namespace
namespace {
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auto HTTP1_IGN_HDLEN = util::array_size(HTTP1_IGN_HD);
} // namespace
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bool name_less(const Headers::value_type &lhs, const Headers::value_type &rhs) {
if (lhs.name.c_str()[0] == ':') {
if (rhs.name.c_str()[0] != ':') {
return true;
}
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} else if (rhs.name.c_str()[0] == ':') {
return false;
}
return lhs.name < rhs.name;
}
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bool check_http2_headers(const Headers &nva) {
for (size_t i = 0; i < DISALLOWED_HDLEN; ++i) {
if (std::binary_search(std::begin(nva), std::end(nva),
Header(DISALLOWED_HD[i], ""), name_less)) {
return false;
}
}
return true;
}
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bool check_http2_request_headers(const Headers &nva) {
return check_http2_headers(nva);
}
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bool check_http2_response_headers(const Headers &nva) {
return check_http2_headers(nva);
}
namespace {
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template <typename InputIterator>
bool check_pseudo_header(const uint8_t *name, size_t namelen,
InputIterator allowed_first,
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InputIterator allowed_last) {
for (auto i = allowed_first; i != allowed_last; ++i) {
if (util::streq(*i, name, namelen)) {
return true;
}
}
return false;
}
} // namespace
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bool check_http2_request_pseudo_header(const uint8_t *name, size_t namelen) {
return check_pseudo_header(name, namelen, REQUEST_PSEUDO_HD,
REQUEST_PSEUDO_HD + REQUEST_PSEUDO_HDLEN);
}
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bool check_http2_response_pseudo_header(const uint8_t *name, size_t namelen) {
return check_pseudo_header(name, namelen, RESPONSE_PSEUDO_HD,
RESPONSE_PSEUDO_HD + RESPONSE_PSEUDO_HDLEN);
}
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void normalize_headers(Headers &nva) {
for (auto &kv : nva) {
util::inp_strlower(kv.name);
}
std::stable_sort(std::begin(nva), std::end(nva), name_less);
}
Headers::value_type to_header(const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
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bool no_index) {
return Header(std::string(reinterpret_cast<const char *>(name), namelen),
std::string(reinterpret_cast<const char *>(value), valuelen),
no_index);
}
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void add_header(Headers &nva, const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen, bool no_index) {
if (valuelen > 0) {
size_t i, j;
for (i = 0; i < valuelen && (value[i] == ' ' || value[i] == '\t'); ++i)
;
for (j = valuelen - 1; j > i && (value[j] == ' ' || value[j] == '\t'); --j)
;
value += i;
valuelen -= i + (valuelen - j - 1);
}
nva.push_back(to_header(name, namelen, value, valuelen, no_index));
}
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const Headers::value_type *get_unique_header(const Headers &nva,
const char *name) {
auto nv = Headers::value_type(name, "");
auto i = std::lower_bound(std::begin(nva), std::end(nva), nv, name_less);
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if (i != std::end(nva) && (*i).name == nv.name) {
auto j = i + 1;
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if (j == std::end(nva) || (*j).name != nv.name) {
return &(*i);
}
}
return nullptr;
}
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const Headers::value_type *get_header(const Headers &nva, const char *name) {
auto nv = Headers::value_type(name, "");
auto i = std::lower_bound(std::begin(nva), std::end(nva), nv, name_less);
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if (i != std::end(nva) && (*i).name == nv.name) {
return &(*i);
}
return nullptr;
}
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std::string value_to_str(const Headers::value_type *nv) {
if (nv) {
return nv->value;
}
return "";
}
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bool non_empty_value(const Headers::value_type *nv) {
return nv && !nv->value.empty();
}
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nghttp2_nv make_nv(const std::string &name, const std::string &value,
bool no_index) {
uint8_t flags;
flags = no_index ? NGHTTP2_NV_FLAG_NO_INDEX : NGHTTP2_NV_FLAG_NONE;
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return {(uint8_t *)name.c_str(), (uint8_t *)value.c_str(), name.size(),
value.size(), flags};
}
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void copy_norm_headers_to_nva(std::vector<nghttp2_nv> &nva,
const Headers &headers) {
size_t i, j;
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for (i = 0, j = 0; i < headers.size() && j < IGN_HDLEN;) {
auto &kv = headers[i];
int rv = strcmp(kv.name.c_str(), IGN_HD[j]);
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if (rv < 0) {
if (!kv.name.empty() && kv.name.c_str()[0] != ':') {
nva.push_back(make_nv(kv.name, kv.value, kv.no_index));
}
++i;
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} else if (rv > 0) {
++j;
} else {
++i;
}
}
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for (; i < headers.size(); ++i) {
auto &kv = headers[i];
if (!kv.name.empty() && kv.name.c_str()[0] != ':') {
nva.push_back(make_nv(kv.name, kv.value, kv.no_index));
}
}
}
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void build_http1_headers_from_norm_headers(std::string &hdrs,
const Headers &headers) {
size_t i, j;
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for (i = 0, j = 0; i < headers.size() && j < HTTP1_IGN_HDLEN;) {
auto &kv = headers[i];
auto rv = strcmp(kv.name.c_str(), HTTP1_IGN_HD[j]);
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if (rv < 0) {
if (!kv.name.empty() && kv.name.c_str()[0] != ':') {
hdrs += kv.name;
capitalize(hdrs, hdrs.size() - kv.name.size());
hdrs += ": ";
hdrs += kv.value;
sanitize_header_value(hdrs, hdrs.size() - kv.value.size());
hdrs += "\r\n";
}
++i;
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} else if (rv > 0) {
++j;
} else {
++i;
}
}
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for (; i < headers.size(); ++i) {
auto &kv = headers[i];
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if (!kv.name.empty() && kv.name.c_str()[0] != ':') {
hdrs += kv.name;
capitalize(hdrs, hdrs.size() - kv.name.size());
hdrs += ": ";
hdrs += kv.value;
sanitize_header_value(hdrs, hdrs.size() - kv.value.size());
hdrs += "\r\n";
}
}
}
int32_t determine_window_update_transmission(nghttp2_session *session,
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int32_t stream_id) {
int32_t recv_length, window_size;
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if (stream_id == 0) {
recv_length = nghttp2_session_get_effective_recv_data_length(session);
window_size = nghttp2_session_get_effective_local_window_size(session);
} else {
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recv_length = nghttp2_session_get_stream_effective_recv_data_length(
session, stream_id);
window_size = nghttp2_session_get_stream_effective_local_window_size(
session, stream_id);
}
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if (recv_length != -1 && window_size != -1) {
if (recv_length >= window_size / 2) {
return recv_length;
}
}
return -1;
}
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void dump_nv(FILE *out, const char **nv) {
for (size_t i = 0; nv[i]; i += 2) {
fwrite(nv[i], strlen(nv[i]), 1, out);
fwrite(": ", 2, 1, out);
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fwrite(nv[i + 1], strlen(nv[i + 1]), 1, out);
fwrite("\n", 1, 1, out);
}
fwrite("\n", 1, 1, out);
fflush(out);
}
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void dump_nv(FILE *out, const nghttp2_nv *nva, size_t nvlen) {
auto end = nva + nvlen;
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for (; nva != end; ++nva) {
fwrite(nva->name, nva->namelen, 1, out);
fwrite(": ", 2, 1, out);
fwrite(nva->value, nva->valuelen, 1, out);
fwrite("\n", 1, 1, out);
}
fwrite("\n", 1, 1, out);
fflush(out);
}
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void dump_nv(FILE *out, const Headers &nva) {
for (auto &nv : nva) {
fwrite(nv.name.c_str(), nv.name.size(), 1, out);
fwrite(": ", 2, 1, out);
fwrite(nv.value.c_str(), nv.value.size(), 1, out);
fwrite("\n", 1, 1, out);
}
fwrite("\n", 1, 1, out);
fflush(out);
}
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std::string rewrite_location_uri(const std::string &uri,
const http_parser_url &u,
const std::string &request_host,
const std::string &upstream_scheme,
uint16_t upstream_port) {
// We just rewrite host and optionally port. We don't rewrite https
// link. Not sure it happens in practice.
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if (u.field_set & (1 << UF_SCHEMA)) {
auto field = &u.field_data[UF_SCHEMA];
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if (!util::streq("http", &uri[field->off], field->len)) {
return "";
}
}
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if ((u.field_set & (1 << UF_HOST)) == 0) {
return "";
}
auto field = &u.field_data[UF_HOST];
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if (!util::startsWith(std::begin(request_host), std::end(request_host),
&uri[field->off], &uri[field->off] + field->len) ||
(request_host.size() != field->len && request_host[field->len] != ':')) {
return "";
}
std::string res = upstream_scheme;
res += "://";
res.append(&uri[field->off], field->len);
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if (upstream_scheme == "http") {
if (upstream_port != 80) {
res += ":";
res += util::utos(upstream_port);
}
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} else if (upstream_scheme == "https") {
if (upstream_port != 443) {
res += ":";
res += util::utos(upstream_port);
}
}
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if (u.field_set & (1 << UF_PATH)) {
field = &u.field_data[UF_PATH];
res.append(&uri[field->off], field->len);
}
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if (u.field_set & (1 << UF_QUERY)) {
field = &u.field_data[UF_QUERY];
res += "?";
res.append(&uri[field->off], field->len);
}
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if (u.field_set & (1 << UF_FRAGMENT)) {
field = &u.field_data[UF_FRAGMENT];
res += "#";
res.append(&uri[field->off], field->len);
}
return res;
}
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int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
size_t valuelen) {
if (!nghttp2_check_header_name(name, namelen)) {
return 0;
}
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if (!nghttp2_check_header_value(value, valuelen)) {
return 0;
}
return 1;
}
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int parse_http_status_code(const std::string &src) {
if (src.size() != 3) {
return -1;
}
int status = 0;
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for (auto c : src) {
if (!isdigit(c)) {
return -1;
}
status *= 10;
status += c - '0';
}
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if (status < 100) {
return -1;
}
return status;
}
void init_hdidx(int *hdidx) { memset(hdidx, -1, sizeof(hdidx[0]) * HD_MAXIDX); }
// This function was generated by genheaderfunc.py. Inspired by h2o
// header lookup. https://github.com/h2o/h2o
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void index_header(int *hdidx, const uint8_t *name, size_t namelen, size_t idx) {
switch (namelen) {
case 2:
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switch (util::lowcase(name[namelen - 1])) {
case 'e':
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if (util::streq("t", name, 1)) {
hdidx[HD_TE] = idx;
return;
}
break;
}
break;
case 4:
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switch (util::lowcase(name[namelen - 1])) {
case 't':
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if (util::streq("hos", name, 3)) {
hdidx[HD_HOST] = idx;
return;
}
break;
}
break;
case 5:
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switch (util::lowcase(name[namelen - 1])) {
case 'h':
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if (util::streq(":pat", name, 4)) {
hdidx[HD_PATH] = idx;
return;
}
break;
}
break;
case 6:
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switch (util::lowcase(name[namelen - 1])) {
case 't':
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if (util::streq("expec", name, 5)) {
hdidx[HD_EXPECT] = idx;
return;
}
break;
}
break;
case 7:
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switch (util::lowcase(name[namelen - 1])) {
case 'd':
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if (util::streq(":metho", name, 6)) {
hdidx[HD_METHOD] = idx;
return;
}
break;
case 'e':
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if (util::streq(":schem", name, 6)) {
hdidx[HD_SCHEME] = idx;
return;
}
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if (util::streq("upgrad", name, 6)) {
hdidx[HD_UPGRADE] = idx;
return;
}
break;
}
break;
case 10:
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switch (util::lowcase(name[namelen - 1])) {
case 'e':
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if (util::streq("keep-aliv", name, 9)) {
hdidx[HD_KEEP_ALIVE] = idx;
return;
}
break;
case 'n':
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if (util::streq("connectio", name, 9)) {
hdidx[HD_CONNECTION] = idx;
return;
}
break;
case 'y':
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if (util::streq(":authorit", name, 9)) {
hdidx[HD_AUTHORITY] = idx;
return;
}
break;
}
break;
case 16:
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switch (util::lowcase(name[namelen - 1])) {
case 'n':
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if (util::streq("proxy-connectio", name, 15)) {
hdidx[HD_PROXY_CONNECTION] = idx;
return;
}
break;
}
break;
case 17:
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switch (util::lowcase(name[namelen - 1])) {
case 'e':
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if (util::streq("if-modified-sinc", name, 16)) {
hdidx[HD_IF_MODIFIED_SINCE] = idx;
return;
}
break;
case 'g':
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if (util::streq("transfer-encodin", name, 16)) {
hdidx[HD_TRANSFER_ENCODING] = idx;
return;
}
break;
}
break;
}
}
bool check_http2_request_pseudo_header(int *hdidx, const uint8_t *s,
size_t len) {
switch (len) {
case 5:
switch (util::lowcase(s[len - 1])) {
case 'h':
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if (util::streq(":pat", s, 4)) {
if (hdidx[HD_PATH] != -1) {
return false;
}
return true;
}
break;
}
break;
case 7:
switch (util::lowcase(s[len - 1])) {
case 'd':
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if (util::streq(":metho", s, 6)) {
if (hdidx[HD_METHOD] != -1) {
return false;
}
return true;
}
break;
case 'e':
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if (util::streq(":schem", s, 6)) {
if (hdidx[HD_SCHEME] != -1) {
return false;
}
return true;
}
break;
}
break;
case 10:
switch (util::lowcase(s[len - 1])) {
case 'y':
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if (util::streq(":authorit", s, 9)) {
if (hdidx[HD_AUTHORITY] != -1) {
return false;
}
return true;
}
break;
}
break;
}
return false;
}
bool check_http2_headers(int *hdidx) {
if (hdidx[HD_CONNECTION] != -1 || hdidx[HD_KEEP_ALIVE] != -1 ||
hdidx[HD_PROXY_CONNECTION] != -1 || hdidx[HD_TE] != -1 ||
hdidx[HD_TRANSFER_ENCODING] != -1 || hdidx[HD_UPGRADE] != -1) {
return false;
}
return true;
}
bool check_http2_request_headers(int *hdidx) {
if (!check_http2_headers(hdidx)) {
return false;
}
if (hdidx[HD_METHOD] == -1 || hdidx[HD_PATH] == -1 ||
hdidx[HD_SCHEME] == -1 ||
(hdidx[HD_AUTHORITY] == -1 && hdidx[HD_HOST] == -1)) {
return false;
}
return true;
}
const Headers::value_type *get_header(int *hdidx, int hdkey,
const Headers &nva) {
auto i = hdidx[hdkey];
if (i == -1) {
return nullptr;
}
return &nva[i];
}
} // namespace http2
} // namespace nghttp2