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curl/lib/http1.c

347 строки
9.4 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#ifndef CURL_DISABLE_HTTP
#include "urldata.h"
#include <curl/curl.h>
#include "http.h"
#include "http1.h"
#include "urlapi-int.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#define H1_MAX_URL_LEN (8*1024)
void Curl_h1_req_parse_init(struct h1_req_parser *parser, size_t max_line_len)
{
memset(parser, 0, sizeof(*parser));
parser->max_line_len = max_line_len;
Curl_dyn_init(&parser->scratch, max_line_len);
}
void Curl_h1_req_parse_free(struct h1_req_parser *parser)
{
if(parser) {
Curl_http_req_free(parser->req);
Curl_dyn_free(&parser->scratch);
parser->req = NULL;
parser->done = FALSE;
}
}
static CURLcode trim_line(struct h1_req_parser *parser, int options)
{
DEBUGASSERT(parser->line);
if(parser->line_len) {
if(parser->line[parser->line_len - 1] == '\n')
--parser->line_len;
if(parser->line_len) {
if(parser->line[parser->line_len - 1] == '\r')
--parser->line_len;
else if(options & H1_PARSE_OPT_STRICT)
return CURLE_URL_MALFORMAT;
}
else if(options & H1_PARSE_OPT_STRICT)
return CURLE_URL_MALFORMAT;
}
else if(options & H1_PARSE_OPT_STRICT)
return CURLE_URL_MALFORMAT;
if(parser->line_len > parser->max_line_len) {
return CURLE_URL_MALFORMAT;
}
return CURLE_OK;
}
static ssize_t detect_line(struct h1_req_parser *parser,
const char *buf, const size_t buflen,
CURLcode *err)
{
const char *line_end;
DEBUGASSERT(!parser->line);
line_end = memchr(buf, '\n', buflen);
if(!line_end) {
*err = CURLE_AGAIN;
return -1;
}
parser->line = buf;
parser->line_len = line_end - buf + 1;
*err = CURLE_OK;
return (ssize_t)parser->line_len;
}
static ssize_t next_line(struct h1_req_parser *parser,
const char *buf, const size_t buflen, int options,
CURLcode *err)
{
ssize_t nread = 0;
if(parser->line) {
parser->line = NULL;
parser->line_len = 0;
Curl_dyn_reset(&parser->scratch);
}
nread = detect_line(parser, buf, buflen, err);
if(nread >= 0) {
if(Curl_dyn_len(&parser->scratch)) {
/* append detected line to scratch to have the complete line */
*err = Curl_dyn_addn(&parser->scratch, parser->line, parser->line_len);
if(*err)
return -1;
parser->line = Curl_dyn_ptr(&parser->scratch);
parser->line_len = Curl_dyn_len(&parser->scratch);
}
*err = trim_line(parser, options);
if(*err)
return -1;
}
else if(*err == CURLE_AGAIN) {
/* no line end in `buf`, add it to our scratch */
*err = Curl_dyn_addn(&parser->scratch, (const unsigned char *)buf, buflen);
nread = (*err)? -1 : (ssize_t)buflen;
}
return nread;
}
static CURLcode start_req(struct h1_req_parser *parser,
const char *scheme_default, int options)
{
const char *p, *m, *target, *hv, *scheme, *authority, *path;
size_t m_len, target_len, hv_len, scheme_len, authority_len, path_len;
size_t i;
CURLU *url = NULL;
CURLcode result = CURLE_URL_MALFORMAT; /* Use this as default fail */
DEBUGASSERT(!parser->req);
/* line must match: "METHOD TARGET HTTP_VERSION" */
p = memchr(parser->line, ' ', parser->line_len);
if(!p || p == parser->line)
goto out;
m = parser->line;
m_len = p - parser->line;
target = p + 1;
target_len = hv_len = 0;
hv = NULL;
/* URL may contain spaces so scan backwards */
for(i = parser->line_len; i > m_len; --i) {
if(parser->line[i] == ' ') {
hv = &parser->line[i + 1];
hv_len = parser->line_len - i;
target_len = (hv - target) - 1;
break;
}
}
/* no SPACE found or empty TARGET or empty HTTP_VERSION */
if(!target_len || !hv_len)
goto out;
/* TODO: we do not check HTTP_VERSION for conformity, should
+ do that when STRICT option is supplied. */
(void)hv;
/* The TARGET can be (rfc 9112, ch. 3.2):
* origin-form: path + optional query
* absolute-form: absolute URI
* authority-form: host+port for CONNECT
* asterisk-form: '*' for OPTIONS
*
* from TARGET, we derive `scheme` `authority` `path`
* origin-form -- -- TARGET
* absolute-form URL* URL* URL*
* authority-form -- TARGET --
* asterisk-form -- -- TARGET
*/
scheme = authority = path = NULL;
scheme_len = authority_len = path_len = 0;
if(target_len == 1 && target[0] == '*') {
/* asterisk-form */
path = target;
path_len = target_len;
}
else if(!strncmp("CONNECT", m, m_len)) {
/* authority-form */
authority = target;
authority_len = target_len;
}
else if(target[0] == '/') {
/* origin-form */
path = target;
path_len = target_len;
}
else {
/* origin-form OR absolute-form */
CURLUcode uc;
char tmp[H1_MAX_URL_LEN];
/* default, unless we see an absolute URL */
path = target;
path_len = target_len;
/* URL parser wants 0-termination */
if(target_len >= sizeof(tmp))
goto out;
memcpy(tmp, target, target_len);
tmp[target_len] = '\0';
/* See if treating TARGET as an absolute URL makes sense */
if(Curl_is_absolute_url(tmp, NULL, 0, FALSE)) {
unsigned int url_options;
url = curl_url();
if(!url) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
url_options = (CURLU_NON_SUPPORT_SCHEME|
CURLU_PATH_AS_IS|
CURLU_NO_DEFAULT_PORT);
if(!(options & H1_PARSE_OPT_STRICT))
url_options |= CURLU_ALLOW_SPACE;
uc = curl_url_set(url, CURLUPART_URL, tmp, url_options);
if(uc) {
goto out;
}
}
if(!url && (options & H1_PARSE_OPT_STRICT)) {
/* we should have an absolute URL or have seen `/` earlier */
goto out;
}
}
if(url) {
result = Curl_http_req_make2(&parser->req, m, m_len, url, scheme_default);
}
else {
if(!scheme && scheme_default) {
scheme = scheme_default;
scheme_len = strlen(scheme_default);
}
result = Curl_http_req_make(&parser->req, m, m_len, scheme, scheme_len,
authority, authority_len, path, path_len);
}
out:
curl_url_cleanup(url);
return result;
}
ssize_t Curl_h1_req_parse_read(struct h1_req_parser *parser,
const char *buf, size_t buflen,
const char *scheme_default, int options,
CURLcode *err)
{
ssize_t nread = 0, n;
*err = CURLE_OK;
while(!parser->done) {
n = next_line(parser, buf, buflen, options, err);
if(n < 0) {
if(*err != CURLE_AGAIN) {
nread = -1;
}
*err = CURLE_OK;
goto out;
}
/* Consume this line */
nread += (size_t)n;
buf += (size_t)n;
buflen -= (size_t)n;
if(!parser->line) {
/* consumed bytes, but line not complete */
if(!buflen)
goto out;
}
else if(!parser->req) {
*err = start_req(parser, scheme_default, options);
if(*err) {
nread = -1;
goto out;
}
}
else if(parser->line_len == 0) {
/* last, empty line, we are finished */
if(!parser->req) {
*err = CURLE_URL_MALFORMAT;
nread = -1;
goto out;
}
parser->done = TRUE;
Curl_dyn_reset(&parser->scratch);
/* last chance adjustments */
}
else {
*err = Curl_dynhds_h1_add_line(&parser->req->headers,
parser->line, parser->line_len);
if(*err) {
nread = -1;
goto out;
}
}
}
out:
return nread;
}
CURLcode Curl_h1_req_write_head(struct httpreq *req, int http_minor,
struct dynbuf *dbuf)
{
CURLcode result;
result = Curl_dyn_addf(dbuf, "%s %s%s%s%s HTTP/1.%d\r\n",
req->method,
req->scheme? req->scheme : "",
req->scheme? "://" : "",
req->authority? req->authority : "",
req->path? req->path : "",
http_minor);
if(result)
goto out;
result = Curl_dynhds_h1_dprint(&req->headers, dbuf);
if(result)
goto out;
result = Curl_dyn_addn(dbuf, STRCONST("\r\n"));
out:
return result;
}
#endif /* !CURL_DISABLE_HTTP */
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