569 lines
15 KiB
C++
569 lines
15 KiB
C++
/*
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* nghttp2 - HTTP/2 C Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "http2.h"
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#include "util.h"
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namespace nghttp2 {
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namespace http2 {
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std::string get_status_string(unsigned int status_code)
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{
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switch(status_code) {
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case 100: return "100 Continue";
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case 101: return "101 Switching Protocols";
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case 200: return "200 OK";
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case 201: return "201 Created";
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case 202: return "202 Accepted";
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case 203: return "203 Non-Authoritative Information";
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case 204: return "204 No Content";
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case 205: return "205 Reset Content";
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case 206: return "206 Partial Content";
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case 300: return "300 Multiple Choices";
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case 301: return "301 Moved Permanently";
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case 302: return "302 Found";
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case 303: return "303 See Other";
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case 304: return "304 Not Modified";
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case 305: return "305 Use Proxy";
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// case 306: return "306 (Unused)";
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case 307: return "307 Temporary Redirect";
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case 400: return "400 Bad Request";
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case 401: return "401 Unauthorized";
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case 402: return "402 Payment Required";
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case 403: return "403 Forbidden";
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case 404: return "404 Not Found";
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case 405: return "405 Method Not Allowed";
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case 406: return "406 Not Acceptable";
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case 407: return "407 Proxy Authentication Required";
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case 408: return "408 Request Timeout";
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case 409: return "409 Conflict";
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case 410: return "410 Gone";
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case 411: return "411 Length Required";
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case 412: return "412 Precondition Failed";
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case 413: return "413 Request Entity Too Large";
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case 414: return "414 Request-URI Too Long";
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case 415: return "415 Unsupported Media Type";
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case 416: return "416 Requested Range Not Satisfiable";
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case 417: return "417 Expectation Failed";
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case 500: return "500 Internal Server Error";
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case 501: return "501 Not Implemented";
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case 502: return "502 Bad Gateway";
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case 503: return "503 Service Unavailable";
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case 504: return "504 Gateway Timeout";
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case 505: return "505 HTTP Version Not Supported";
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default: return util::utos(status_code);
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}
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}
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void capitalize(std::string& s, size_t offset)
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{
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s[offset] = util::upcase(s[offset]);
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for(size_t i = offset+1, eoi = s.size(); i < eoi; ++i) {
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if(s[i-1] == '-') {
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s[i] = util::upcase(s[i]);
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} else {
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s[i] = util::lowcase(s[i]);
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}
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}
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}
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bool lws(const char *value)
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{
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for(; *value; ++value) {
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switch(*value) {
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case '\t':
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case ' ':
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continue;
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default:
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return false;
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}
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}
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return true;
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}
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void sanitize_header_value(std::string& s, size_t offset)
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{
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// Since both nghttp2 and spdylay do not allow \n and \r in header
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// values, we don't have to do this anymore.
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// for(size_t i = offset, eoi = s.size(); i < eoi; ++i) {
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// if(s[i] == '\r' || s[i] == '\n') {
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// s[i] = ' ';
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// }
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// }
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}
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void copy_url_component(std::string& dest, const http_parser_url *u, int field,
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const char* url)
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{
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if(u->field_set & (1 << field)) {
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dest.assign(url+u->field_data[field].off, u->field_data[field].len);
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}
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}
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bool check_http2_allowed_header(const char *name)
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{
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return check_http2_allowed_header(reinterpret_cast<const uint8_t*>(name),
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strlen(name));
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}
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bool check_http2_allowed_header(const uint8_t *name, size_t namelen)
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{
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return
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!util::strieq("connection", name, namelen) &&
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!util::strieq("host", name, namelen) &&
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!util::strieq("keep-alive", name, namelen) &&
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!util::strieq("proxy-connection", name, namelen) &&
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!util::strieq("te", name, namelen) &&
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!util::strieq("transfer-encoding", name, namelen) &&
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!util::strieq("upgrade", name, namelen);
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}
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namespace {
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const char *DISALLOWED_HD[] = {
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"connection",
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"keep-alive",
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"proxy-connection",
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"te",
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"transfer-encoding",
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"upgrade",
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};
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} // namespace
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namespace {
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size_t DISALLOWED_HDLEN = sizeof(DISALLOWED_HD)/sizeof(DISALLOWED_HD[0]);
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} // namespace
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namespace {
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const char *IGN_HD[] = {
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"connection",
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"expect",
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"http2-settings",
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"keep-alive",
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"proxy-connection",
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"te",
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"transfer-encoding",
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"upgrade",
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"via",
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"x-forwarded-for",
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"x-forwarded-proto",
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};
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} // namespace
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namespace {
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size_t IGN_HDLEN = sizeof(IGN_HD)/sizeof(IGN_HD[0]);
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} // namespace
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namespace {
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const char *HTTP1_IGN_HD[] = {
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"connection",
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"cookie",
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"expect",
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"http2-settings",
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"keep-alive",
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"proxy-connection",
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"upgrade",
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"via",
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"x-forwarded-for",
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"x-forwarded-proto",
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};
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} // namespace
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namespace {
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size_t HTTP1_IGN_HDLEN = sizeof(HTTP1_IGN_HD)/sizeof(HTTP1_IGN_HD[0]);
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} // namespace
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namespace {
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auto nv_name_less = [](const nghttp2_nv& lhs, const nghttp2_nv& rhs)
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{
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return nghttp2_nv_compare_name(&lhs, &rhs) < 0;
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};
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} // namespace
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bool name_less(const Headers::value_type& lhs,
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const Headers::value_type& rhs)
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{
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return lhs.name < rhs.name;
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}
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bool check_http2_headers(const Headers& nva)
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{
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for(size_t i = 0; i < DISALLOWED_HDLEN; ++i) {
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if(std::binary_search(std::begin(nva), std::end(nva),
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Header(DISALLOWED_HD[i], ""), name_less)) {
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return false;
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}
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}
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return true;
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}
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void normalize_headers(Headers& nva)
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{
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for(auto& kv : nva) {
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util::inp_strlower(kv.name);
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}
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std::stable_sort(std::begin(nva), std::end(nva), name_less);
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}
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std::vector<nghttp2_nv> sort_nva(const nghttp2_nv *nva, size_t nvlen)
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{
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auto v = std::vector<nghttp2_nv>(&nva[0], &nva[nvlen]);
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std::sort(std::begin(v), std::end(v), nv_name_less);
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auto res = std::vector<nghttp2_nv>();
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res.reserve(nvlen);
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for(size_t i = 0; i < nvlen; ++i) {
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if(v[i].valuelen == 0) {
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res.push_back(v[i]);
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continue;
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}
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auto j = v[i].value;
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auto end = v[i].value + v[i].valuelen;
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for(;;) {
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// Skip 0 length value
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j = std::find_if(j, end,
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[](uint8_t c)
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{
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return c != '\0';
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});
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if(j == end) {
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break;
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}
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auto l = std::find(j, end, '\0');
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res.push_back({v[i].name, j, v[i].namelen, static_cast<size_t>(l - j)});
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j = l;
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}
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}
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return res;
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}
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Headers::value_type to_header(const uint8_t *name, size_t namelen,
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const uint8_t *value, size_t valuelen,
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bool no_index)
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{
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return Header(std::string(reinterpret_cast<const char*>(name),
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namelen),
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std::string(reinterpret_cast<const char*>(value),
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valuelen),
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no_index);
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}
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void split_add_header(Headers& nva,
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const uint8_t *name, size_t namelen,
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const uint8_t *value, size_t valuelen,
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bool no_index)
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{
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if(valuelen == 0) {
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nva.push_back(to_header(name, namelen, value, valuelen, no_index));
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return;
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}
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auto j = value;
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auto end = value + valuelen;
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for(;;) {
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// Skip 0 length value
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j = std::find_if(j, end,
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[](uint8_t c)
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{
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return c != '\0';
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});
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if(j == end) {
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break;
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}
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auto l = std::find(j, end, '\0');
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nva.push_back(to_header(name, namelen, j, l-j, no_index));
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j = l;
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}
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}
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const Headers::value_type* get_unique_header(const Headers& nva,
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const char *name)
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{
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auto nv = Headers::value_type(name, "");
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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) {
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auto j = i + 1;
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if(j == std::end(nva) || (*j).name != nv.name) {
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return &(*i);
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}
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}
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return nullptr;
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}
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const Headers::value_type* get_header(const Headers& nva, const char *name)
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{
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auto nv = Headers::value_type(name, "");
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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) {
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return &(*i);
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}
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return nullptr;
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}
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std::string value_to_str(const Headers::value_type *nv)
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{
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if(nv) {
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return nv->value;
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}
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return "";
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}
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bool value_lws(const Headers::value_type *nv)
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{
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return (*nv).value.find_first_not_of("\t ") == std::string::npos;
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}
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bool non_empty_value(const Headers::value_type *nv)
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{
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return nv && !value_lws(nv);
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}
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nghttp2_nv make_nv(const std::string& name, const std::string& value,
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bool no_index)
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{
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uint8_t flags;
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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(),
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name.size(), value.size(), flags};
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}
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Headers concat_norm_headers(Headers headers)
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{
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auto res = Headers();
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res.reserve(headers.size());
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for(auto& kv : headers) {
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if(!res.empty() && res.back().name == kv.name &&
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kv.name != "cookie" && kv.name != "set-cookie") {
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auto& last = res.back();
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if(!kv.value.empty()) {
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last.value.append(1, '\0');
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last.value += kv.value;
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}
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// We do ORing nv flags. This is done even if value is empty.
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last.no_index |= kv.no_index;
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} else {
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res.push_back(std::move(kv));
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}
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}
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return res;
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}
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void copy_norm_headers_to_nva
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(std::vector<nghttp2_nv>& nva, const Headers& headers)
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{
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size_t i, j;
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for(i = 0, j = 0; i < headers.size() && j < IGN_HDLEN;) {
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auto& kv = headers[i];
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int rv = strcmp(kv.name.c_str(), IGN_HD[j]);
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if(rv < 0) {
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if(!kv.name.empty() && kv.name.c_str()[0] != ':') {
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nva.push_back(make_nv(kv.name, kv.value, kv.no_index));
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}
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++i;
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} else if(rv > 0) {
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++j;
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} else {
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++i;
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}
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}
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for(; i < headers.size(); ++i) {
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auto& kv = headers[i];
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if(!kv.name.empty() && kv.name.c_str()[0] != ':') {
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nva.push_back(make_nv(kv.name, kv.value, kv.no_index));
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}
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}
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}
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void build_http1_headers_from_norm_headers
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(std::string& hdrs, const Headers& headers)
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{
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size_t i, j;
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for(i = 0, j = 0; i < headers.size() && j < HTTP1_IGN_HDLEN;) {
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auto& kv = headers[i];
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auto rv = strcmp(kv.name.c_str(), HTTP1_IGN_HD[j]);
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if(rv < 0) {
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if(!kv.name.empty() && kv.name.c_str()[0] != ':') {
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hdrs += kv.name;
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capitalize(hdrs, hdrs.size() - kv.name.size());
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hdrs += ": ";
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hdrs += kv.value;
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sanitize_header_value(hdrs, hdrs.size() - kv.value.size());
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hdrs += "\r\n";
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}
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++i;
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} else if(rv > 0) {
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++j;
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} else {
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++i;
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}
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}
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for(; i < headers.size(); ++i) {
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auto& kv = headers[i];
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if(!kv.name.empty() && kv.name.c_str()[0] != ':') {
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hdrs += kv.name;
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capitalize(hdrs, hdrs.size() - kv.name.size());
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hdrs += ": ";
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hdrs += kv.value;
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sanitize_header_value(hdrs, hdrs.size() - kv.value.size());
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hdrs += "\r\n";
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}
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}
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}
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int32_t determine_window_update_transmission(nghttp2_session *session,
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int32_t stream_id)
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{
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int32_t recv_length, window_size;
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if(stream_id == 0) {
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recv_length = nghttp2_session_get_effective_recv_data_length(session);
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window_size = nghttp2_session_get_effective_local_window_size(session);
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} else {
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recv_length = nghttp2_session_get_stream_effective_recv_data_length
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(session, stream_id);
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window_size = nghttp2_session_get_stream_effective_local_window_size
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(session, stream_id);
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}
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if(recv_length != -1 && window_size != -1) {
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if(recv_length >= window_size / 2) {
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return recv_length;
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}
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}
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return -1;
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}
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void dump_nv(FILE *out, const char **nv)
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{
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for(size_t i = 0; nv[i]; i += 2) {
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fwrite(nv[i], strlen(nv[i]), 1, out);
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fwrite(": ", 2, 1, out);
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fwrite(nv[i+1], strlen(nv[i+1]), 1, out);
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fwrite("\n", 1, 1, out);
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}
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fwrite("\n", 1, 1, out);
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fflush(out);
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}
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void dump_nv(FILE *out, const nghttp2_nv *nva, size_t nvlen)
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{
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// |nva| may have NULL-concatenated header fields
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auto v = sort_nva(nva, nvlen);
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for(auto& nv : v) {
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fwrite(nv.name, nv.namelen, 1, out);
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fwrite(": ", 2, 1, out);
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fwrite(nv.value, nv.valuelen, 1, out);
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fwrite("\n", 1, 1, out);
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}
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fwrite("\n", 1, 1, out);
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fflush(out);
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}
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|
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void dump_nv(FILE *out, const Headers& nva)
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{
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for(auto& nv : nva) {
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fwrite(nv.name.c_str(), nv.name.size(), 1, out);
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fwrite(": ", 2, 1, out);
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fwrite(nv.value.c_str(), nv.value.size(), 1, out);
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fwrite("\n", 1, 1, out);
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}
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fwrite("\n", 1, 1, out);
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fflush(out);
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}
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|
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std::string rewrite_location_uri(const std::string& uri,
|
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const http_parser_url& u,
|
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const std::string& request_host,
|
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const std::string& upstream_scheme,
|
|
uint16_t upstream_port)
|
|
{
|
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// We just rewrite host and optionally port. We don't rewrite https
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// link. Not sure it happens in practice.
|
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if(u.field_set & (1 << UF_SCHEMA)) {
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auto field = &u.field_data[UF_SCHEMA];
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if(!util::streq("http", &uri[field->off], field->len)) {
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|
return "";
|
|
}
|
|
}
|
|
if((u.field_set & (1 << UF_HOST)) == 0) {
|
|
return "";
|
|
}
|
|
auto field = &u.field_data[UF_HOST];
|
|
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);
|
|
if(upstream_scheme == "http") {
|
|
if(upstream_port != 80) {
|
|
res += ":";
|
|
res += util::utos(upstream_port);
|
|
}
|
|
} else if(upstream_scheme == "https") {
|
|
if(upstream_port != 443) {
|
|
res += ":";
|
|
res += util::utos(upstream_port);
|
|
}
|
|
}
|
|
if(u.field_set & (1 << UF_PATH)) {
|
|
field = &u.field_data[UF_PATH];
|
|
res.append(&uri[field->off], field->len);
|
|
}
|
|
if(u.field_set & (1 << UF_QUERY)) {
|
|
field = &u.field_data[UF_QUERY];
|
|
res += "?";
|
|
res.append(&uri[field->off], field->len);
|
|
}
|
|
if(u.field_set & (1 << UF_FRAGMENT)) {
|
|
field = &u.field_data[UF_FRAGMENT];
|
|
res += "#";
|
|
res.append(&uri[field->off], field->len);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
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;
|
|
}
|
|
if(!nghttp2_check_header_value(value, valuelen)) {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
} // namespace http2
|
|
|
|
} // namespace nghttp2
|