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nghttp2/src/http2.cc

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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 {
StringRef get_reason_phrase(unsigned int status_code) {
switch (status_code) {
case 100:
return StringRef::from_lit("Continue");
case 101:
return StringRef::from_lit("Switching Protocols");
case 200:
return StringRef::from_lit("OK");
case 201:
return StringRef::from_lit("Created");
case 202:
return StringRef::from_lit("Accepted");
case 203:
return StringRef::from_lit("Non-Authoritative Information");
case 204:
return StringRef::from_lit("No Content");
case 205:
return StringRef::from_lit("Reset Content");
case 206:
return StringRef::from_lit("Partial Content");
case 300:
return StringRef::from_lit("Multiple Choices");
case 301:
return StringRef::from_lit("Moved Permanently");
case 302:
return StringRef::from_lit("Found");
case 303:
return StringRef::from_lit("See Other");
case 304:
return StringRef::from_lit("Not Modified");
case 305:
return StringRef::from_lit("Use Proxy");
// case 306: return StringRef::from_lit("(Unused)");
case 307:
return StringRef::from_lit("Temporary Redirect");
case 308:
return StringRef::from_lit("Permanent Redirect");
case 400:
return StringRef::from_lit("Bad Request");
case 401:
return StringRef::from_lit("Unauthorized");
case 402:
return StringRef::from_lit("Payment Required");
case 403:
return StringRef::from_lit("Forbidden");
case 404:
return StringRef::from_lit("Not Found");
case 405:
return StringRef::from_lit("Method Not Allowed");
case 406:
return StringRef::from_lit("Not Acceptable");
case 407:
return StringRef::from_lit("Proxy Authentication Required");
case 408:
return StringRef::from_lit("Request Timeout");
case 409:
return StringRef::from_lit("Conflict");
case 410:
return StringRef::from_lit("Gone");
case 411:
return StringRef::from_lit("Length Required");
case 412:
return StringRef::from_lit("Precondition Failed");
case 413:
return StringRef::from_lit("Payload Too Large");
case 414:
return StringRef::from_lit("URI Too Long");
case 415:
return StringRef::from_lit("Unsupported Media Type");
case 416:
return StringRef::from_lit("Requested Range Not Satisfiable");
case 417:
return StringRef::from_lit("Expectation Failed");
case 421:
return StringRef::from_lit("Misdirected Request");
case 426:
return StringRef::from_lit("Upgrade Required");
case 428:
return StringRef::from_lit("Precondition Required");
case 429:
return StringRef::from_lit("Too Many Requests");
case 431:
return StringRef::from_lit("Request Header Fields Too Large");
case 451:
return StringRef::from_lit("Unavailable For Legal Reasons");
case 500:
return StringRef::from_lit("Internal Server Error");
case 501:
return StringRef::from_lit("Not Implemented");
case 502:
return StringRef::from_lit("Bad Gateway");
case 503:
return StringRef::from_lit("Service Unavailable");
case 504:
return StringRef::from_lit("Gateway Timeout");
case 505:
return StringRef::from_lit("HTTP Version Not Supported");
case 511:
return StringRef::from_lit("Network Authentication Required");
default:
return StringRef{};
}
}
StringRef stringify_status(BlockAllocator &balloc, unsigned int status_code) {
switch (status_code) {
case 100:
return StringRef::from_lit("100");
case 101:
return StringRef::from_lit("101");
case 200:
return StringRef::from_lit("200");
case 201:
return StringRef::from_lit("201");
case 202:
return StringRef::from_lit("202");
case 203:
return StringRef::from_lit("203");
case 204:
return StringRef::from_lit("204");
case 205:
return StringRef::from_lit("205");
case 206:
return StringRef::from_lit("206");
case 300:
return StringRef::from_lit("300");
case 301:
return StringRef::from_lit("301");
case 302:
return StringRef::from_lit("302");
case 303:
return StringRef::from_lit("303");
case 304:
return StringRef::from_lit("304");
case 305:
return StringRef::from_lit("305");
// case 306: return StringRef::from_lit("306");
case 307:
return StringRef::from_lit("307");
case 308:
return StringRef::from_lit("308");
case 400:
return StringRef::from_lit("400");
case 401:
return StringRef::from_lit("401");
case 402:
return StringRef::from_lit("402");
case 403:
return StringRef::from_lit("403");
case 404:
return StringRef::from_lit("404");
case 405:
return StringRef::from_lit("405");
case 406:
return StringRef::from_lit("406");
case 407:
return StringRef::from_lit("407");
case 408:
return StringRef::from_lit("408");
case 409:
return StringRef::from_lit("409");
case 410:
return StringRef::from_lit("410");
case 411:
return StringRef::from_lit("411");
case 412:
return StringRef::from_lit("412");
case 413:
return StringRef::from_lit("413");
case 414:
return StringRef::from_lit("414");
case 415:
return StringRef::from_lit("415");
case 416:
return StringRef::from_lit("416");
case 417:
return StringRef::from_lit("417");
case 421:
return StringRef::from_lit("421");
case 426:
return StringRef::from_lit("426");
case 428:
return StringRef::from_lit("428");
case 429:
return StringRef::from_lit("429");
case 431:
return StringRef::from_lit("431");
case 451:
return StringRef::from_lit("451");
case 500:
return StringRef::from_lit("500");
case 501:
return StringRef::from_lit("501");
case 502:
return StringRef::from_lit("502");
case 503:
return StringRef::from_lit("503");
case 504:
return StringRef::from_lit("504");
case 505:
return StringRef::from_lit("505");
case 511:
return StringRef::from_lit("511");
default:
return util::make_string_ref_uint(balloc, status_code);
}
}
void capitalize(DefaultMemchunks *buf, const StringRef &s) {
buf->append(util::upcase(s[0]));
for (size_t i = 1; i < s.size(); ++i) {
if (s[i - 1] == '-') {
buf->append(util::upcase(s[i]));
} else {
buf->append(s[i]);
}
}
}
bool lws(const char *value) {
for (; *value; ++value) {
switch (*value) {
case '\t':
case ' ':
continue;
default:
return false;
}
}
return true;
}
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);
}
}
Headers::value_type to_header(const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
bool no_index, int32_t token) {
return Header(std::string(reinterpret_cast<const char *>(name), namelen),
std::string(reinterpret_cast<const char *>(value), valuelen),
no_index, token);
}
void add_header(Headers &nva, const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen, bool no_index,
int32_t token) {
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, token));
}
const Headers::value_type *get_header(const Headers &nva, const char *name) {
const Headers::value_type *res = nullptr;
for (auto &nv : nva) {
if (nv.name == name) {
res = &nv;
}
}
return res;
}
bool non_empty_value(const HeaderRefs::value_type *nv) {
return nv && !nv->value.empty();
}
namespace {
nghttp2_nv make_nv_internal(const std::string &name, const std::string &value,
bool no_index, uint8_t nv_flags) {
uint8_t flags;
flags =
nv_flags | (no_index ? NGHTTP2_NV_FLAG_NO_INDEX : NGHTTP2_NV_FLAG_NONE);
return {(uint8_t *)name.c_str(), (uint8_t *)value.c_str(), name.size(),
value.size(), flags};
}
} // namespace
namespace {
nghttp2_nv make_nv_internal(const StringRef &name, const StringRef &value,
bool no_index, uint8_t nv_flags) {
uint8_t flags;
flags =
nv_flags | (no_index ? NGHTTP2_NV_FLAG_NO_INDEX : NGHTTP2_NV_FLAG_NONE);
return {(uint8_t *)name.c_str(), (uint8_t *)value.c_str(), name.size(),
value.size(), flags};
}
} // namespace
nghttp2_nv make_nv(const std::string &name, const std::string &value,
bool no_index) {
return make_nv_internal(name, value, no_index, NGHTTP2_NV_FLAG_NONE);
}
nghttp2_nv make_nv(const StringRef &name, const StringRef &value,
bool no_index) {
return make_nv_internal(name, value, no_index, NGHTTP2_NV_FLAG_NONE);
}
nghttp2_nv make_nv_nocopy(const std::string &name, const std::string &value,
bool no_index) {
return make_nv_internal(name, value, no_index,
NGHTTP2_NV_FLAG_NO_COPY_NAME |
NGHTTP2_NV_FLAG_NO_COPY_VALUE);
}
nghttp2_nv make_nv_nocopy(const StringRef &name, const StringRef &value,
bool no_index) {
return make_nv_internal(name, value, no_index,
NGHTTP2_NV_FLAG_NO_COPY_NAME |
NGHTTP2_NV_FLAG_NO_COPY_VALUE);
}
namespace {
void copy_headers_to_nva_internal(std::vector<nghttp2_nv> &nva,
const HeaderRefs &headers, uint8_t nv_flags) {
for (auto &kv : headers) {
if (kv.name.empty() || kv.name[0] == ':') {
continue;
}
switch (kv.token) {
case HD_COOKIE:
case HD_CONNECTION:
case HD_FORWARDED:
case HD_HOST:
case HD_HTTP2_SETTINGS:
case HD_KEEP_ALIVE:
case HD_PROXY_CONNECTION:
case HD_SERVER:
case HD_TE:
case HD_TRANSFER_ENCODING:
case HD_UPGRADE:
case HD_VIA:
case HD_X_FORWARDED_FOR:
case HD_X_FORWARDED_PROTO:
continue;
}
nva.push_back(make_nv_internal(kv.name, kv.value, kv.no_index, nv_flags));
}
}
} // namespace
void copy_headers_to_nva(std::vector<nghttp2_nv> &nva,
const HeaderRefs &headers) {
copy_headers_to_nva_internal(nva, headers, NGHTTP2_NV_FLAG_NONE);
}
void copy_headers_to_nva_nocopy(std::vector<nghttp2_nv> &nva,
const HeaderRefs &headers) {
copy_headers_to_nva_internal(nva, headers, NGHTTP2_NV_FLAG_NO_COPY_NAME |
NGHTTP2_NV_FLAG_NO_COPY_VALUE);
}
void build_http1_headers_from_headers(DefaultMemchunks *buf,
const HeaderRefs &headers) {
for (auto &kv : headers) {
if (kv.name.empty() || kv.name[0] == ':') {
continue;
}
switch (kv.token) {
case HD_CONNECTION:
case HD_COOKIE:
case HD_FORWARDED:
case HD_HOST:
case HD_HTTP2_SETTINGS:
case HD_KEEP_ALIVE:
case HD_PROXY_CONNECTION:
case HD_SERVER:
case HD_UPGRADE:
case HD_VIA:
case HD_X_FORWARDED_FOR:
case HD_X_FORWARDED_PROTO:
continue;
}
capitalize(buf, kv.name);
buf->append(": ");
buf->append(kv.value);
buf->append("\r\n");
}
}
int32_t determine_window_update_transmission(nghttp2_session *session,
int32_t stream_id) {
int32_t recv_length, window_size;
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 {
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);
}
if (recv_length != -1 && window_size != -1) {
if (recv_length >= window_size / 2) {
return recv_length;
}
}
return -1;
}
void dump_nv(FILE *out, const char **nv) {
for (size_t i = 0; nv[i]; i += 2) {
fprintf(out, "%s: %s\n", nv[i], nv[i + 1]);
}
fputc('\n', out);
fflush(out);
}
void dump_nv(FILE *out, const nghttp2_nv *nva, size_t nvlen) {
auto end = nva + nvlen;
for (; nva != end; ++nva) {
fprintf(out, "%s: %s\n", nva->name, nva->value);
}
fputc('\n', out);
fflush(out);
}
void dump_nv(FILE *out, const Headers &nva) {
for (auto &nv : nva) {
fprintf(out, "%s: %s\n", nv.name.c_str(), nv.value.c_str());
}
fputc('\n', out);
fflush(out);
}
void dump_nv(FILE *out, const HeaderRefs &nva) {
for (auto &nv : nva) {
fprintf(out, "%s: %s\n", nv.name.c_str(), nv.value.c_str());
}
fputc('\n', out);
fflush(out);
}
void erase_header(HeaderRef *hd) {
hd->name = StringRef{};
hd->token = -1;
}
StringRef rewrite_location_uri(BlockAllocator &balloc, const StringRef &uri,
const http_parser_url &u,
const StringRef &match_host,
const StringRef &request_authority,
const StringRef &upstream_scheme) {
// We just rewrite scheme and authority.
if ((u.field_set & (1 << UF_HOST)) == 0) {
return StringRef{};
}
auto field = &u.field_data[UF_HOST];
if (!util::starts_with(std::begin(match_host), std::end(match_host),
&uri[field->off], &uri[field->off] + field->len) ||
(match_host.size() != field->len && match_host[field->len] != ':')) {
return StringRef{};
}
auto len = 0;
if (!request_authority.empty()) {
len += upstream_scheme.size() + str_size("://") + request_authority.size();
}
if (u.field_set & (1 << UF_PATH)) {
field = &u.field_data[UF_PATH];
len += field->len;
}
if (u.field_set & (1 << UF_QUERY)) {
field = &u.field_data[UF_QUERY];
len += 1 + field->len;
}
if (u.field_set & (1 << UF_FRAGMENT)) {
field = &u.field_data[UF_FRAGMENT];
len += 1 + field->len;
}
auto iov = make_byte_ref(balloc, len + 1);
auto p = iov.base;
if (!request_authority.empty()) {
p = std::copy(std::begin(upstream_scheme), std::end(upstream_scheme), p);
p = util::copy_lit(p, "://");
p = std::copy(std::begin(request_authority), std::end(request_authority),
p);
}
if (u.field_set & (1 << UF_PATH)) {
field = &u.field_data[UF_PATH];
p = std::copy_n(&uri[field->off], field->len, p);
}
if (u.field_set & (1 << UF_QUERY)) {
field = &u.field_data[UF_QUERY];
*p++ = '?';
p = std::copy_n(&uri[field->off], field->len, p);
}
if (u.field_set & (1 << UF_FRAGMENT)) {
field = &u.field_data[UF_FRAGMENT];
*p++ = '#';
p = std::copy_n(&uri[field->off], field->len, p);
}
*p = '\0';
return StringRef{iov.base, p};
}
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;
}
int parse_http_status_code(const StringRef &src) {
if (src.size() != 3) {
return -1;
}
int status = 0;
for (auto c : src) {
if (!isdigit(c)) {
return -1;
}
status *= 10;
status += c - '0';
}
if (status < 100) {
return -1;
}
return status;
}
int lookup_token(const StringRef &name) {
return lookup_token(name.byte(), name.size());
}
// This function was generated by genheaderfunc.py. Inspired by h2o
// header lookup. https://github.com/h2o/h2o
int lookup_token(const uint8_t *name, size_t namelen) {
switch (namelen) {
case 2:
switch (name[1]) {
case 'e':
if (util::streq_l("t", name, 1)) {
return HD_TE;
}
break;
}
break;
case 3:
switch (name[2]) {
case 'a':
if (util::streq_l("vi", name, 2)) {
return HD_VIA;
}
break;
}
break;
case 4:
switch (name[3]) {
case 'e':
if (util::streq_l("dat", name, 3)) {
return HD_DATE;
}
break;
case 'k':
if (util::streq_l("lin", name, 3)) {
return HD_LINK;
}
break;
case 't':
if (util::streq_l("hos", name, 3)) {
return HD_HOST;
}
break;
}
break;
case 5:
switch (name[4]) {
case 'h':
if (util::streq_l(":pat", name, 4)) {
return HD__PATH;
}
break;
case 't':
if (util::streq_l(":hos", name, 4)) {
return HD__HOST;
}
break;
}
break;
case 6:
switch (name[5]) {
case 'e':
if (util::streq_l("cooki", name, 5)) {
return HD_COOKIE;
}
break;
case 'r':
if (util::streq_l("serve", name, 5)) {
return HD_SERVER;
}
break;
case 't':
if (util::streq_l("expec", name, 5)) {
return HD_EXPECT;
}
break;
}
break;
case 7:
switch (name[6]) {
case 'c':
if (util::streq_l("alt-sv", name, 6)) {
return HD_ALT_SVC;
}
break;
case 'd':
if (util::streq_l(":metho", name, 6)) {
return HD__METHOD;
}
break;
case 'e':
if (util::streq_l(":schem", name, 6)) {
return HD__SCHEME;
}
if (util::streq_l("upgrad", name, 6)) {
return HD_UPGRADE;
}
break;
case 'r':
if (util::streq_l("traile", name, 6)) {
return HD_TRAILER;
}
break;
case 's':
if (util::streq_l(":statu", name, 6)) {
return HD__STATUS;
}
break;
}
break;
case 8:
switch (name[7]) {
case 'n':
if (util::streq_l("locatio", name, 7)) {
return HD_LOCATION;
}
break;
}
break;
case 9:
switch (name[8]) {
case 'd':
if (util::streq_l("forwarde", name, 8)) {
return HD_FORWARDED;
}
break;
}
break;
case 10:
switch (name[9]) {
case 'e':
if (util::streq_l("keep-aliv", name, 9)) {
return HD_KEEP_ALIVE;
}
break;
case 'n':
if (util::streq_l("connectio", name, 9)) {
return HD_CONNECTION;
}
break;
case 't':
if (util::streq_l("user-agen", name, 9)) {
return HD_USER_AGENT;
}
break;
case 'y':
if (util::streq_l(":authorit", name, 9)) {
return HD__AUTHORITY;
}
break;
}
break;
case 12:
switch (name[11]) {
case 'e':
if (util::streq_l("content-typ", name, 11)) {
return HD_CONTENT_TYPE;
}
break;
}
break;
case 13:
switch (name[12]) {
case 'l':
if (util::streq_l("cache-contro", name, 12)) {
return HD_CACHE_CONTROL;
}
break;
}
break;
case 14:
switch (name[13]) {
case 'h':
if (util::streq_l("content-lengt", name, 13)) {
return HD_CONTENT_LENGTH;
}
break;
case 's':
if (util::streq_l("http2-setting", name, 13)) {
return HD_HTTP2_SETTINGS;
}
break;
}
break;
case 15:
switch (name[14]) {
case 'e':
if (util::streq_l("accept-languag", name, 14)) {
return HD_ACCEPT_LANGUAGE;
}
break;
case 'g':
if (util::streq_l("accept-encodin", name, 14)) {
return HD_ACCEPT_ENCODING;
}
break;
case 'r':
if (util::streq_l("x-forwarded-fo", name, 14)) {
return HD_X_FORWARDED_FOR;
}
break;
}
break;
case 16:
switch (name[15]) {
case 'n':
if (util::streq_l("proxy-connectio", name, 15)) {
return HD_PROXY_CONNECTION;
}
break;
}
break;
case 17:
switch (name[16]) {
case 'e':
if (util::streq_l("if-modified-sinc", name, 16)) {
return HD_IF_MODIFIED_SINCE;
}
break;
case 'g':
if (util::streq_l("transfer-encodin", name, 16)) {
return HD_TRANSFER_ENCODING;
}
break;
case 'o':
if (util::streq_l("x-forwarded-prot", name, 16)) {
return HD_X_FORWARDED_PROTO;
}
break;
}
break;
}
return -1;
}
void init_hdidx(HeaderIndex &hdidx) {
std::fill(std::begin(hdidx), std::end(hdidx), -1);
}
void index_header(HeaderIndex &hdidx, int32_t token, size_t idx) {
if (token == -1) {
return;
}
assert(token < HD_MAXIDX);
hdidx[token] = idx;
}
const Headers::value_type *get_header(const HeaderIndex &hdidx, int32_t token,
const Headers &nva) {
auto i = hdidx[token];
if (i == -1) {
return nullptr;
}
return &nva[i];
}
Headers::value_type *get_header(const HeaderIndex &hdidx, int32_t token,
Headers &nva) {
auto i = hdidx[token];
if (i == -1) {
return nullptr;
}
return &nva[i];
}
namespace {
template <typename InputIt> InputIt skip_lws(InputIt first, InputIt last) {
for (; first != last; ++first) {
switch (*first) {
case ' ':
case '\t':
continue;
default:
return first;
}
}
return first;
}
} // namespace
namespace {
template <typename InputIt>
InputIt skip_to_next_field(InputIt first, InputIt last) {
for (; first != last; ++first) {
switch (*first) {
case ' ':
case '\t':
case ',':
continue;
default:
return first;
}
}
return first;
}
} // namespace
namespace {
// Skip to the right dquote ('"'), handling backslash escapes.
// Returns |last| if input is not terminated with '"'.
template <typename InputIt>
InputIt skip_to_right_dquote(InputIt first, InputIt last) {
for (; first != last;) {
switch (*first) {
case '"':
return first;
case '\\':
++first;
if (first == last) {
return first;
}
break;
}
++first;
}
return first;
}
} // namespace
namespace {
// Returns true if link-param does not match pattern |pat| of length
// |patlen| or it has empty value (""). |pat| should be parmname
// followed by "=".
bool check_link_param_empty(const char *first, const char *last,
const char *pat, size_t patlen) {
if (first + patlen <= last) {
if (std::equal(pat, pat + patlen, first, util::CaseCmp())) {
// we only accept URI if pat is followd by "" (e.g.,
// loadpolicy="") here.
if (first + patlen + 2 <= last) {
if (*(first + patlen) != '"' || *(first + patlen + 1) != '"') {
return false;
}
} else {
// here we got invalid production (anchor=") or anchor=?
return false;
}
}
}
return true;
}
} // namespace
namespace {
// Returns true if link-param consists of only parmname, and it
// matches string [pat, pat + patlen).
bool check_link_param_without_value(const char *first, const char *last,
const char *pat, size_t patlen) {
if (first + patlen > last) {
return false;
}
if (first + patlen == last) {
return std::equal(pat, pat + patlen, first, util::CaseCmp());
}
switch (*(first + patlen)) {
case ';':
case ',':
return std::equal(pat, pat + patlen, first, util::CaseCmp());
}
return false;
}
} // namespace
namespace {
std::pair<LinkHeader, const char *>
parse_next_link_header_once(const char *first, const char *last) {
first = skip_to_next_field(first, last);
if (first == last || *first != '<') {
return {{StringRef{}}, last};
}
auto url_first = ++first;
first = std::find(first, last, '>');
if (first == last) {
return {{StringRef{}}, first};
}
auto url_last = first++;
if (first == last) {
return {{StringRef{}}, first};
}
// we expect ';' or ',' here
switch (*first) {
case ',':
return {{StringRef{}}, ++first};
case ';':
++first;
break;
default:
return {{StringRef{}}, last};
}
auto ok = false;
auto ign = false;
for (;;) {
first = skip_lws(first, last);
if (first == last) {
return {{StringRef{}}, first};
}
// we expect link-param
if (!ign) {
if (!ok) {
// rel can take several relations using quoted form.
static constexpr char PLP[] = "rel=\"";
static constexpr size_t PLPLEN = str_size(PLP);
static constexpr char PLT[] = "preload";
static constexpr size_t PLTLEN = str_size(PLT);
if (first + PLPLEN < last && *(first + PLPLEN - 1) == '"' &&
std::equal(PLP, PLP + PLPLEN, first, util::CaseCmp())) {
// we have to search preload in whitespace separated list:
// rel="preload something http://example.org/foo"
first += PLPLEN;
auto start = first;
for (; first != last;) {
if (*first != ' ' && *first != '"') {
++first;
continue;
}
if (start == first) {
return {{StringRef{}}, last};
}
if (!ok && start + PLTLEN == first &&
std::equal(PLT, PLT + PLTLEN, start, util::CaseCmp())) {
ok = true;
}
if (*first == '"') {
break;
}
first = skip_lws(first, last);
start = first;
}
if (first == last) {
return {{StringRef{}}, last};
}
assert(*first == '"');
++first;
if (first == last || *first == ',') {
goto almost_done;
}
if (*first == ';') {
++first;
// parse next link-param
continue;
}
return {{StringRef{}}, last};
}
}
// we are only interested in rel=preload parameter. Others are
// simply skipped.
static constexpr char PL[] = "rel=preload";
static constexpr size_t PLLEN = str_size(PL);
if (first + PLLEN == last) {
if (std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
// ok = true;
// this is the end of sequence
return {{{url_first, url_last}}, last};
}
} else if (first + PLLEN + 1 <= last) {
switch (*(first + PLLEN)) {
case ',':
if (!std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
break;
}
// ok = true;
// skip including ','
first += PLLEN + 1;
return {{{url_first, url_last}}, first};
case ';':
if (!std::equal(PL, PL + PLLEN, first, util::CaseCmp())) {
break;
}
ok = true;
// skip including ';'
first += PLLEN + 1;
// continue parse next link-param
continue;
}
}
// we have to reject URI if we have nonempty anchor parameter.
static constexpr char ANCHOR[] = "anchor=";
static constexpr size_t ANCHORLEN = str_size(ANCHOR);
if (!ign && !check_link_param_empty(first, last, ANCHOR, ANCHORLEN)) {
ign = true;
}
// reject URI if we have non-empty loadpolicy. This could be
// tightened up to just pick up "next" or "insert".
static constexpr char LOADPOLICY[] = "loadpolicy=";
static constexpr size_t LOADPOLICYLEN = str_size(LOADPOLICY);
if (!ign &&
!check_link_param_empty(first, last, LOADPOLICY, LOADPOLICYLEN)) {
ign = true;
}
// reject URI if we have nopush attribute.
static constexpr char NOPUSH[] = "nopush";
static constexpr size_t NOPUSHLEN = str_size(NOPUSH);
if (!ign &&
check_link_param_without_value(first, last, NOPUSH, NOPUSHLEN)) {
ign = true;
}
}
auto param_first = first;
for (; first != last;) {
if (util::in_attr_char(*first)) {
++first;
continue;
}
// '*' is only allowed at the end of parameter name and must be
// followed by '='
if (last - first >= 2 && first != param_first) {
if (*first == '*' && *(first + 1) == '=') {
++first;
break;
}
}
if (*first == '=' || *first == ';' || *first == ',') {
break;
}
return {{StringRef{}}, last};
}
if (param_first == first) {
// empty parmname
return {{StringRef{}}, last};
}
// link-param without value is acceptable (see link-extension) if
// it is not followed by '='
if (first == last || *first == ',') {
goto almost_done;
}
if (*first == ';') {
++first;
// parse next link-param
continue;
}
// now parsing link-param value
assert(*first == '=');
++first;
if (first == last) {
// empty value is not acceptable
return {{StringRef{}}, first};
}
if (*first == '"') {
// quoted-string
first = skip_to_right_dquote(first + 1, last);
if (first == last) {
return {{StringRef{}}, first};
}
++first;
if (first == last || *first == ',') {
goto almost_done;
}
if (*first == ';') {
++first;
// parse next link-param
continue;
}
return {{StringRef{}}, last};
}
// not quoted-string, skip to next ',' or ';'
if (*first == ',' || *first == ';') {
// empty value
return {{StringRef{}}, last};
}
for (; first != last; ++first) {
if (*first == ',' || *first == ';') {
break;
}
}
if (first == last || *first == ',') {
goto almost_done;
}
assert(*first == ';');
++first;
// parse next link-param
}
almost_done:
assert(first == last || *first == ',');
if (first != last) {
++first;
}
if (ok && !ign) {
return {{{url_first, url_last}}, first};
}
return {{StringRef{}}, first};
}
} // namespace
std::vector<LinkHeader> parse_link_header(const StringRef &src) {
std::vector<LinkHeader> res;
for (auto first = std::begin(src); first != std::end(src);) {
auto rv = parse_next_link_header_once(first, std::end(src));
first = rv.second;
auto &link = rv.first;
if (!link.uri.empty()) {
res.push_back(link);
}
}
return res;
}
std::string path_join(const StringRef &base_path, const StringRef &base_query,
const StringRef &rel_path, const StringRef &rel_query) {
BlockAllocator balloc(1024, 1024);
return path_join(balloc, base_path, base_query, rel_path, rel_query).str();
}
bool expect_response_body(int status_code) {
return status_code / 100 != 1 && status_code != 304 && status_code != 204;
}
bool expect_response_body(const std::string &method, int status_code) {
return method != "HEAD" && expect_response_body(status_code);
}
bool expect_response_body(int method_token, int status_code) {
return method_token != HTTP_HEAD && expect_response_body(status_code);
}
int lookup_method_token(const StringRef &name) {
return lookup_method_token(name.byte(), name.size());
}
// This function was generated by genmethodfunc.py.
int lookup_method_token(const uint8_t *name, size_t namelen) {
switch (namelen) {
case 3:
switch (name[2]) {
case 'T':
if (util::streq_l("GE", name, 2)) {
return HTTP_GET;
}
if (util::streq_l("PU", name, 2)) {
return HTTP_PUT;
}
break;
}
break;
case 4:
switch (name[3]) {
case 'D':
if (util::streq_l("HEA", name, 3)) {
return HTTP_HEAD;
}
break;
case 'E':
if (util::streq_l("MOV", name, 3)) {
return HTTP_MOVE;
}
break;
case 'K':
if (util::streq_l("LOC", name, 3)) {
return HTTP_LOCK;
}
break;
case 'T':
if (util::streq_l("POS", name, 3)) {
return HTTP_POST;
}
break;
case 'Y':
if (util::streq_l("COP", name, 3)) {
return HTTP_COPY;
}
break;
}
break;
case 5:
switch (name[4]) {
case 'E':
if (util::streq_l("MERG", name, 4)) {
return HTTP_MERGE;
}
if (util::streq_l("PURG", name, 4)) {
return HTTP_PURGE;
}
if (util::streq_l("TRAC", name, 4)) {
return HTTP_TRACE;
}
break;
case 'H':
if (util::streq_l("PATC", name, 4)) {
return HTTP_PATCH;
}
break;
case 'L':
if (util::streq_l("MKCO", name, 4)) {
return HTTP_MKCOL;
}
break;
}
break;
case 6:
switch (name[5]) {
case 'E':
if (util::streq_l("DELET", name, 5)) {
return HTTP_DELETE;
}
break;
case 'H':
if (util::streq_l("SEARC", name, 5)) {
return HTTP_SEARCH;
}
break;
case 'K':
if (util::streq_l("UNLOC", name, 5)) {
return HTTP_UNLOCK;
}
break;
case 'T':
if (util::streq_l("REPOR", name, 5)) {
return HTTP_REPORT;
}
break;
case 'Y':
if (util::streq_l("NOTIF", name, 5)) {
return HTTP_NOTIFY;
}
break;
}
break;
case 7:
switch (name[6]) {
case 'H':
if (util::streq_l("MSEARC", name, 6)) {
return HTTP_MSEARCH;
}
break;
case 'S':
if (util::streq_l("OPTION", name, 6)) {
return HTTP_OPTIONS;
}
break;
case 'T':
if (util::streq_l("CONNEC", name, 6)) {
return HTTP_CONNECT;
}
break;
}
break;
case 8:
switch (name[7]) {
case 'D':
if (util::streq_l("PROPFIN", name, 7)) {
return HTTP_PROPFIND;
}
break;
case 'T':
if (util::streq_l("CHECKOU", name, 7)) {
return HTTP_CHECKOUT;
}
break;
}
break;
case 9:
switch (name[8]) {
case 'E':
if (util::streq_l("SUBSCRIB", name, 8)) {
return HTTP_SUBSCRIBE;
}
break;
case 'H':
if (util::streq_l("PROPPATC", name, 8)) {
return HTTP_PROPPATCH;
}
break;
}
break;
case 10:
switch (name[9]) {
case 'R':
if (util::streq_l("MKCALENDA", name, 9)) {
return HTTP_MKCALENDAR;
}
break;
case 'Y':
if (util::streq_l("MKACTIVIT", name, 9)) {
return HTTP_MKACTIVITY;
}
break;
}
break;
case 11:
switch (name[10]) {
case 'E':
if (util::streq_l("UNSUBSCRIB", name, 10)) {
return HTTP_UNSUBSCRIBE;
}
break;
}
break;
}
return -1;
}
StringRef to_method_string(int method_token) {
// we happened to use same value for method with http-parser.
return StringRef{http_method_str(static_cast<http_method>(method_token))};
}
StringRef get_pure_path_component(const StringRef &uri) {
int rv;
http_parser_url u{};
rv = http_parser_parse_url(uri.c_str(), uri.size(), 0, &u);
if (rv != 0) {
return StringRef{};
}
if (u.field_set & (1 << UF_PATH)) {
auto &f = u.field_data[UF_PATH];
return StringRef{uri.c_str() + f.off, f.len};
}
return StringRef::from_lit("/");
}
int construct_push_component(BlockAllocator &balloc, StringRef &scheme,
StringRef &authority, StringRef &path,
const StringRef &base, const StringRef &uri) {
int rv;
StringRef rel, relq;
http_parser_url u{};
rv = http_parser_parse_url(uri.c_str(), uri.size(), 0, &u);
if (rv != 0) {
if (uri[0] == '/') {
return -1;
}
// treat link_url as relative URI.
auto end = std::find(std::begin(uri), std::end(uri), '#');
auto q = std::find(std::begin(uri), end, '?');
rel = StringRef{std::begin(uri), q};
if (q != end) {
relq = StringRef{q + 1, std::end(uri)};
}
} else {
if (u.field_set & (1 << UF_SCHEMA)) {
scheme = util::get_uri_field(uri.c_str(), u, UF_SCHEMA);
}
if (u.field_set & (1 << UF_HOST)) {
auto auth = util::get_uri_field(uri.c_str(), u, UF_HOST);
auto len = auth.size();
auto port_exists = u.field_set & (1 << UF_PORT);
if (port_exists) {
len += 1 + str_size("65535");
}
auto iov = make_byte_ref(balloc, len + 1);
auto p = iov.base;
p = std::copy(std::begin(auth), std::end(auth), p);
if (port_exists) {
*p++ = ':';
p = util::utos(p, u.port);
}
*p = '\0';
authority = StringRef{iov.base, p};
}
if (u.field_set & (1 << UF_PATH)) {
auto &f = u.field_data[UF_PATH];
rel = StringRef{uri.c_str() + f.off, f.len};
} else {
rel = StringRef::from_lit("/");
}
if (u.field_set & (1 << UF_QUERY)) {
auto &f = u.field_data[UF_QUERY];
relq = StringRef{uri.c_str() + f.off, f.len};
}
}
path = http2::path_join(balloc, base, StringRef{}, rel, relq);
return 0;
}
namespace {
template <typename InputIt> InputIt eat_file(InputIt first, InputIt last) {
if (first == last) {
*first++ = '/';
return first;
}
if (*(last - 1) == '/') {
return last;
}
auto p = last;
for (; p != first && *(p - 1) != '/'; --p)
;
if (p == first) {
// this should not happend in normal case, where we expect path
// starts with '/'
*first++ = '/';
return first;
}
return p;
}
} // namespace
namespace {
template <typename InputIt> InputIt eat_dir(InputIt first, InputIt last) {
auto p = eat_file(first, last);
--p;
assert(*p == '/');
return eat_file(first, p);
}
} // namespace
StringRef path_join(BlockAllocator &balloc, const StringRef &base_path,
const StringRef &base_query, const StringRef &rel_path,
const StringRef &rel_query) {
auto res = make_byte_ref(
balloc, std::max(static_cast<size_t>(1), base_path.size()) +
rel_path.size() + 1 +
std::max(base_query.size(), rel_query.size()) + 1);
auto p = res.base;
if (rel_path.empty()) {
if (base_path.empty()) {
*p++ = '/';
} else {
p = std::copy(std::begin(base_path), std::end(base_path), p);
}
if (rel_query.empty()) {
if (!base_query.empty()) {
*p++ = '?';
p = std::copy(std::begin(base_query), std::end(base_query), p);
}
*p = '\0';
return StringRef{res.base, p};
}
*p++ = '?';
p = std::copy(std::begin(rel_query), std::end(rel_query), p);
*p = '\0';
return StringRef{res.base, p};
}
auto first = std::begin(rel_path);
auto last = std::end(rel_path);
if (rel_path[0] == '/') {
*p++ = '/';
++first;
for (; first != last && *first == '/'; ++first)
;
} else if (base_path.empty()) {
*p++ = '/';
} else {
p = std::copy(std::begin(base_path), std::end(base_path), p);
}
for (; first != last;) {
if (*first == '.') {
if (first + 1 == last) {
break;
}
if (*(first + 1) == '/') {
first += 2;
continue;
}
if (*(first + 1) == '.') {
if (first + 2 == last) {
p = eat_dir(res.base, p);
break;
}
if (*(first + 2) == '/') {
p = eat_dir(res.base, p);
first += 3;
continue;
}
}
}
if (*(p - 1) != '/') {
p = eat_file(res.base, p);
}
auto slash = std::find(first, last, '/');
if (slash == last) {
p = std::copy(first, last, p);
break;
}
p = std::copy(first, slash + 1, p);
first = slash + 1;
for (; first != last && *first == '/'; ++first)
;
}
if (!rel_query.empty()) {
*p++ = '?';
p = std::copy(std::begin(rel_query), std::end(rel_query), p);
}
*p = '\0';
return StringRef{res.base, p};
}
StringRef normalize_path(BlockAllocator &balloc, const StringRef &path,
const StringRef &query) {
// First, decode %XX for unreserved characters, then do
// http2::path_join
// We won't find %XX if length is less than 3.
if (path.size() < 3 ||
std::find(std::begin(path), std::end(path), '%') == std::end(path)) {
return path_join(balloc, StringRef{}, StringRef{}, path, query);
}
// includes last terminal NULL.
auto result = make_byte_ref(balloc, path.size() + 1);
auto p = result.base;
auto it = std::begin(path);
for (; it + 2 < std::end(path);) {
if (*it == '%') {
if (util::is_hex_digit(*(it + 1)) && util::is_hex_digit(*(it + 2))) {
auto c =
(util::hex_to_uint(*(it + 1)) << 4) + util::hex_to_uint(*(it + 2));
if (util::in_rfc3986_unreserved_chars(c)) {
*p++ = c;
it += 3;
continue;
}
*p++ = '%';
*p++ = util::upcase(*(it + 1));
*p++ = util::upcase(*(it + 2));
it += 3;
continue;
}
}
*p++ = *it++;
}
p = std::copy(it, std::end(path), p);
*p = '\0';
return path_join(balloc, StringRef{}, StringRef{}, StringRef{result.base, p},
query);
}
std::string normalize_path(const StringRef &path, const StringRef &query) {
BlockAllocator balloc(1024, 1024);
return normalize_path(balloc, path, query).str();
}
StringRef rewrite_clean_path(BlockAllocator &balloc, const StringRef &src) {
if (src.empty() || src[0] != '/') {
return src;
}
// probably, not necessary most of the case, but just in case.
auto fragment = std::find(std::begin(src), std::end(src), '#');
auto raw_query = std::find(std::begin(src), fragment, '?');
auto query = raw_query;
if (query != fragment) {
++query;
}
return normalize_path(balloc, StringRef{std::begin(src), raw_query},
StringRef{query, fragment});
}
StringRef copy_lower(BlockAllocator &balloc, const StringRef &src) {
auto iov = make_byte_ref(balloc, src.size() + 1);
auto p = iov.base;
p = std::copy(std::begin(src), std::end(src), p);
*p = '\0';
util::inp_strlower(iov.base, p);
return StringRef{iov.base, p};
}
bool contains_trailers(const StringRef &s) {
constexpr auto trailers = StringRef::from_lit("trailers");
for (auto p = std::begin(s), end = std::end(s);; ++p) {
p = std::find_if(p, end, [](char c) { return c != ' ' && c != '\t'; });
if (p == end || static_cast<size_t>(end - p) < trailers.size()) {
return false;
}
if (util::strieq(trailers, StringRef{p, p + trailers.size()})) {
// Make sure that there is no character other than white spaces
// before next "," or end of string.
p = std::find_if(p + trailers.size(), end,
[](char c) { return c != ' ' && c != '\t'; });
if (p == end || *p == ',') {
return true;
}
}
// Skip to next ",".
p = std::find_if(p, end, [](char c) { return c == ','; });
if (p == end) {
return false;
}
}
}
} // namespace http2
} // namespace nghttp2
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