323 lines
8.7 KiB
C
323 lines
8.7 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifndef CURL_DISABLE_HTTP
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#include "urldata.h"
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#include <curl/curl.h>
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#include "http.h"
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#include "http1.h"
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#include "urlapi-int.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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#define H1_MAX_URL_LEN (8*1024)
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void Curl_h1_req_parse_init(struct h1_req_parser *parser, size_t max_line_len)
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{
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memset(parser, 0, sizeof(*parser));
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parser->max_line_len = max_line_len;
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Curl_dyn_init(&parser->scratch, max_line_len);
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}
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void Curl_h1_req_parse_free(struct h1_req_parser *parser)
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{
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if(parser) {
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Curl_http_req_free(parser->req);
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Curl_dyn_free(&parser->scratch);
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parser->req = NULL;
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parser->done = FALSE;
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}
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}
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static CURLcode trim_line(struct h1_req_parser *parser, int options)
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{
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DEBUGASSERT(parser->line);
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if(parser->line_len) {
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if(parser->line[parser->line_len - 1] == '\n')
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--parser->line_len;
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if(parser->line_len) {
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if(parser->line[parser->line_len - 1] == '\r')
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--parser->line_len;
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else if(options & H1_PARSE_OPT_STRICT)
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return CURLE_URL_MALFORMAT;
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}
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else if(options & H1_PARSE_OPT_STRICT)
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return CURLE_URL_MALFORMAT;
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}
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else if(options & H1_PARSE_OPT_STRICT)
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return CURLE_URL_MALFORMAT;
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if(parser->line_len > parser->max_line_len) {
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return CURLE_URL_MALFORMAT;
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}
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return CURLE_OK;
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}
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static ssize_t detect_line(struct h1_req_parser *parser,
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const char *buf, const size_t buflen,
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CURLcode *err)
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{
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const char *line_end;
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DEBUGASSERT(!parser->line);
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line_end = memchr(buf, '\n', buflen);
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if(!line_end) {
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*err = CURLE_AGAIN;
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return -1;
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}
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parser->line = buf;
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parser->line_len = line_end - buf + 1;
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*err = CURLE_OK;
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return (ssize_t)parser->line_len;
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}
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static ssize_t next_line(struct h1_req_parser *parser,
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const char *buf, const size_t buflen, int options,
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CURLcode *err)
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{
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ssize_t nread = 0;
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if(parser->line) {
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parser->line = NULL;
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parser->line_len = 0;
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Curl_dyn_reset(&parser->scratch);
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}
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nread = detect_line(parser, buf, buflen, err);
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if(nread >= 0) {
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if(Curl_dyn_len(&parser->scratch)) {
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/* append detected line to scratch to have the complete line */
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*err = Curl_dyn_addn(&parser->scratch, parser->line, parser->line_len);
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if(*err)
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return -1;
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parser->line = Curl_dyn_ptr(&parser->scratch);
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parser->line_len = Curl_dyn_len(&parser->scratch);
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}
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*err = trim_line(parser, options);
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if(*err)
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return -1;
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}
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else if(*err == CURLE_AGAIN) {
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/* no line end in `buf`, add it to our scratch */
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*err = Curl_dyn_addn(&parser->scratch, (const unsigned char *)buf, buflen);
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nread = (*err)? -1 : (ssize_t)buflen;
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}
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return nread;
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}
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static CURLcode start_req(struct h1_req_parser *parser,
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const char *scheme_default, int options)
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{
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const char *p, *m, *target, *hv, *scheme, *authority, *path;
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size_t m_len, target_len, hv_len, scheme_len, authority_len, path_len;
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size_t i;
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CURLU *url = NULL;
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CURLcode result = CURLE_URL_MALFORMAT; /* Use this as default fail */
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DEBUGASSERT(!parser->req);
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/* line must match: "METHOD TARGET HTTP_VERSION" */
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p = memchr(parser->line, ' ', parser->line_len);
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if(!p || p == parser->line)
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goto out;
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m = parser->line;
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m_len = p - parser->line;
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target = p + 1;
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target_len = hv_len = 0;
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hv = NULL;
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/* URL may contain spaces so scan backwards */
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for(i = parser->line_len; i > m_len; --i) {
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if(parser->line[i] == ' ') {
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hv = &parser->line[i + 1];
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hv_len = parser->line_len - i;
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target_len = (hv - target) - 1;
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break;
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}
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}
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/* no SPACE found or empty TARGET or empty HTTP_VERSION */
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if(!target_len || !hv_len)
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goto out;
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/* TODO: we do not check HTTP_VERSION for conformity, should
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+ do that when STRICT option is supplied. */
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(void)hv;
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/* The TARGET can be (rfc 9112, ch. 3.2):
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* origin-form: path + optional query
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* absolute-form: absolute URI
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* authority-form: host+port for CONNECT
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* asterisk-form: '*' for OPTIONS
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*
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* from TARGET, we derive `scheme` `authority` `path`
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* origin-form -- -- TARGET
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* absolute-form URL* URL* URL*
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* authority-form -- TARGET --
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* asterisk-form -- -- TARGET
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*/
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scheme = authority = path = NULL;
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scheme_len = authority_len = path_len = 0;
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if(target_len == 1 && target[0] == '*') {
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/* asterisk-form */
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path = target;
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path_len = target_len;
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}
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else if(!strncmp("CONNECT", m, m_len)) {
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/* authority-form */
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authority = target;
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authority_len = target_len;
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}
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else if(target[0] == '/') {
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/* origin-form */
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path = target;
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path_len = target_len;
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}
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else {
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/* origin-form OR absolute-form */
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CURLUcode uc;
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char tmp[H1_MAX_URL_LEN];
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/* default, unless we see an absolute URL */
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path = target;
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path_len = target_len;
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/* URL parser wants 0-termination */
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if(target_len >= sizeof(tmp))
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goto out;
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memcpy(tmp, target, target_len);
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tmp[target_len] = '\0';
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/* See if treating TARGET as an absolute URL makes sense */
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if(Curl_is_absolute_url(tmp, NULL, 0, FALSE)) {
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int url_options;
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url = curl_url();
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if(!url) {
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result = CURLE_OUT_OF_MEMORY;
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goto out;
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}
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url_options = (CURLU_NON_SUPPORT_SCHEME|
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CURLU_PATH_AS_IS|
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CURLU_NO_DEFAULT_PORT);
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if(!(options & H1_PARSE_OPT_STRICT))
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url_options |= CURLU_ALLOW_SPACE;
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uc = curl_url_set(url, CURLUPART_URL, tmp, url_options);
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if(uc) {
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goto out;
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}
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}
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if(!url && (options & H1_PARSE_OPT_STRICT)) {
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/* we should have an absolute URL or have seen `/` earlier */
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goto out;
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}
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}
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if(url) {
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result = Curl_http_req_make2(&parser->req, m, m_len, url, scheme_default);
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}
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else {
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if(!scheme && scheme_default) {
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scheme = scheme_default;
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scheme_len = strlen(scheme_default);
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}
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result = Curl_http_req_make(&parser->req, m, m_len, scheme, scheme_len,
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authority, authority_len, path, path_len);
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}
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out:
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curl_url_cleanup(url);
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return result;
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}
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ssize_t Curl_h1_req_parse_read(struct h1_req_parser *parser,
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const char *buf, size_t buflen,
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const char *scheme_default, int options,
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CURLcode *err)
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{
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ssize_t nread = 0, n;
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*err = CURLE_OK;
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while(!parser->done) {
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n = next_line(parser, buf, buflen, options, err);
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if(n < 0) {
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if(*err != CURLE_AGAIN) {
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nread = -1;
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}
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*err = CURLE_OK;
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goto out;
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}
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/* Consume this line */
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nread += (size_t)n;
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buf += (size_t)n;
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buflen -= (size_t)n;
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if(!parser->line) {
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/* consumed bytes, but line not complete */
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if(!buflen)
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goto out;
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}
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else if(!parser->req) {
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*err = start_req(parser, scheme_default, options);
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if(*err) {
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nread = -1;
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goto out;
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}
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}
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else if(parser->line_len == 0) {
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/* last, empty line, we are finished */
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if(!parser->req) {
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*err = CURLE_URL_MALFORMAT;
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nread = -1;
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goto out;
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}
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parser->done = TRUE;
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Curl_dyn_reset(&parser->scratch);
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/* last chance adjustments */
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}
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else {
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*err = Curl_dynhds_h1_add_line(&parser->req->headers,
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parser->line, parser->line_len);
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if(*err) {
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nread = -1;
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goto out;
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}
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}
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}
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out:
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return nread;
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}
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#endif /* !CURL_DISABLE_HTTP */
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