2 * HTTP protocol for ffmpeg client
3 * Copyright (c) 2000, 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
28 #include "os_support.h"
31 /* XXX: POST protocol is not completely implemented because ffmpeg uses
32 only a subset of it. */
34 /* used for protocol handling */
35 #define BUFFER_SIZE 1024
37 #define MAX_REDIRECTS 8
41 unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
44 int64_t chunksize; /**< Used if "Transfer-Encoding: chunked" otherwise -1. */
45 int64_t off, filesize;
46 char location[URL_SIZE];
47 HTTPAuthState auth_state;
50 static int http_connect(URLContext *h, const char *path, const char *hoststr,
51 const char *auth, int *new_location);
52 static int http_write(URLContext *h, uint8_t *buf, int size);
55 /* return non zero if error */
56 static int http_open_cnx(URLContext *h)
58 const char *path, *proxy_path;
59 char hostname[1024], hoststr[1024];
63 int port, use_proxy, err, location_changed = 0, redirects = 0;
64 HTTPAuthType cur_auth_type;
65 HTTPContext *s = h->priv_data;
66 URLContext *hd = NULL;
68 proxy_path = getenv("http_proxy");
69 use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
70 av_strstart(proxy_path, "http://", NULL);
72 /* fill the dest addr */
74 /* needed in any case to build the host string */
75 ff_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
76 path1, sizeof(path1), s->location);
77 ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
80 ff_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
92 ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
93 err = url_open(&hd, buf, URL_RDWR);
98 cur_auth_type = s->auth_state.auth_type;
99 if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
101 if (s->http_code == 401) {
102 if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
108 if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) {
109 /* url moved, get next */
111 if (redirects++ >= MAX_REDIRECTS)
113 location_changed = 0;
123 static int http_open(URLContext *h, const char *uri, int flags)
130 s = av_malloc(sizeof(HTTPContext));
132 return AVERROR(ENOMEM);
138 memset(&s->auth_state, 0, sizeof(s->auth_state));
139 av_strlcpy(s->location, uri, URL_SIZE);
141 ret = http_open_cnx(h);
146 static int http_getc(HTTPContext *s)
149 if (s->buf_ptr >= s->buf_end) {
150 len = url_read(s->hd, s->buffer, BUFFER_SIZE);
153 } else if (len == 0) {
156 s->buf_ptr = s->buffer;
157 s->buf_end = s->buffer + len;
160 return *s->buf_ptr++;
163 static int http_get_line(HTTPContext *s, char *line, int line_size)
175 if (q > line && q[-1] == '\r')
181 if ((q - line) < line_size - 1)
187 static int process_line(URLContext *h, char *line, int line_count,
190 HTTPContext *s = h->priv_data;
198 if (line_count == 0) {
199 while (!isspace(*p) && *p != '\0')
203 s->http_code = strtol(p, NULL, 10);
205 dprintf(NULL, "http_code=%d\n", s->http_code);
207 /* error codes are 4xx and 5xx, but regard 401 as a success, so we
208 * don't abort until all headers have been parsed. */
209 if (s->http_code >= 400 && s->http_code < 600 && s->http_code != 401)
212 while (*p != '\0' && *p != ':')
222 if (!strcmp(tag, "Location")) {
223 strcpy(s->location, p);
225 } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
226 s->filesize = atoll(p);
227 } else if (!strcmp (tag, "Content-Range")) {
228 /* "bytes $from-$to/$document_size" */
230 if (!strncmp (p, "bytes ", 6)) {
233 if ((slash = strchr(p, '/')) && strlen(slash) > 0)
234 s->filesize = atoll(slash+1);
236 h->is_streamed = 0; /* we _can_ in fact seek */
237 } else if (!strcmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) {
240 } else if (!strcmp (tag, "WWW-Authenticate")) {
241 ff_http_auth_handle_header(&s->auth_state, tag, p);
242 } else if (!strcmp (tag, "Authentication-Info")) {
243 ff_http_auth_handle_header(&s->auth_state, tag, p);
249 static int http_connect(URLContext *h, const char *path, const char *hoststr,
250 const char *auth, int *new_location)
252 HTTPContext *s = h->priv_data;
255 char *authstr = NULL;
256 int64_t off = s->off;
259 /* send http header */
260 post = h->flags & URL_WRONLY;
261 authstr = ff_http_auth_create_response(&s->auth_state, auth, path,
262 post ? "POST" : "GET");
263 snprintf(s->buffer, sizeof(s->buffer),
267 "Range: bytes=%"PRId64"-\r\n"
270 "Connection: close\r\n"
273 post ? "POST" : "GET",
278 authstr ? authstr : "",
279 post ? "Transfer-Encoding: chunked\r\n" : "");
282 if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
285 /* init input buffer */
286 s->buf_ptr = s->buffer;
287 s->buf_end = s->buffer;
292 /* always use chunked encoding for upload data */
297 /* wait for header */
299 if (http_get_line(s, line, sizeof(line)) < 0)
302 dprintf(NULL, "header='%s'\n", line);
304 err = process_line(h, line, s->line_count, new_location);
312 return (off == s->off) ? 0 : -1;
316 static int http_read(URLContext *h, uint8_t *buf, int size)
318 HTTPContext *s = h->priv_data;
321 if (s->chunksize >= 0) {
327 if (http_get_line(s, line, sizeof(line)) < 0)
329 } while (!*line); /* skip CR LF from last chunk */
331 s->chunksize = strtoll(line, NULL, 16);
333 dprintf(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
340 size = FFMIN(size, s->chunksize);
342 /* read bytes from input buffer first */
343 len = s->buf_end - s->buf_ptr;
347 memcpy(buf, s->buf_ptr, len);
350 len = url_read(s->hd, buf, size);
354 if (s->chunksize > 0)
360 /* used only when posting data */
361 static int http_write(URLContext *h, uint8_t *buf, int size)
363 char temp[11]; /* 32-bit hex + CRLF + nul */
365 char crlf[] = "\r\n";
366 HTTPContext *s = h->priv_data;
368 if (s->chunksize == -1) {
369 /* headers are sent without any special encoding */
370 return url_write(s->hd, buf, size);
373 /* silently ignore zero-size data since chunk encoding that would
376 /* upload data using chunked encoding */
377 snprintf(temp, sizeof(temp), "%x\r\n", size);
379 if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 ||
380 (ret = url_write(s->hd, buf, size)) < 0 ||
381 (ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
387 static int http_close(URLContext *h)
390 char footer[] = "0\r\n\r\n";
391 HTTPContext *s = h->priv_data;
393 /* signal end of chunked encoding if used */
394 if ((h->flags & URL_WRONLY) && s->chunksize != -1) {
395 ret = url_write(s->hd, footer, sizeof(footer) - 1);
396 ret = ret > 0 ? 0 : ret;
404 static int64_t http_seek(URLContext *h, int64_t off, int whence)
406 HTTPContext *s = h->priv_data;
407 URLContext *old_hd = s->hd;
408 int64_t old_off = s->off;
409 uint8_t old_buf[BUFFER_SIZE];
412 if (whence == AVSEEK_SIZE)
414 else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
417 /* we save the old context in case the seek fails */
418 old_buf_size = s->buf_end - s->buf_ptr;
419 memcpy(old_buf, s->buf_ptr, old_buf_size);
421 if (whence == SEEK_CUR)
423 else if (whence == SEEK_END)
427 /* if it fails, continue on old connection */
428 if (http_open_cnx(h) < 0) {
429 memcpy(s->buffer, old_buf, old_buf_size);
430 s->buf_ptr = s->buffer;
431 s->buf_end = s->buffer + old_buf_size;
441 http_get_file_handle(URLContext *h)
443 HTTPContext *s = h->priv_data;
444 return url_get_file_handle(s->hd);
447 URLProtocol http_protocol = {
454 .url_get_file_handle = http_get_file_handle,