Fix warning:
[libav.git] / libavformat / http.c
CommitLineData
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1/*
2 * HTTP protocol for ffmpeg client
406792e7 3 * Copyright (c) 2000, 2001 Fabrice Bellard
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4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
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21
22#include "libavutil/base64.h"
23#include "libavutil/avstring.h"
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24#include "avformat.h"
25#include <unistd.h>
7995ed8e 26#include <strings.h>
e4a9e3cc 27#include "internal.h"
558b86a5 28#include "network.h"
a5e979f4 29#include "os_support.h"
558b86a5 30
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31/* XXX: POST protocol is not completely implemented because ffmpeg uses
32 only a subset of it. */
558b86a5 33
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34/* used for protocol handling */
35#define BUFFER_SIZE 1024
36#define URL_SIZE 4096
37#define MAX_REDIRECTS 8
38
39typedef struct {
40 URLContext *hd;
41 unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
42 int line_count;
43 int http_code;
7995ed8e 44 int64_t chunksize; /**< Used if "Transfer-Encoding: chunked" otherwise -1. */
bc5c918e 45 int64_t off, filesize;
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46 char location[URL_SIZE];
47} HTTPContext;
48
49static int http_connect(URLContext *h, const char *path, const char *hoststr,
50 const char *auth, int *new_location);
51static int http_write(URLContext *h, uint8_t *buf, int size);
52
53
54/* return non zero if error */
55static int http_open_cnx(URLContext *h)
56{
57 const char *path, *proxy_path;
58 char hostname[1024], hoststr[1024];
59 char auth[1024];
60 char path1[1024];
61 char buf[1024];
62 int port, use_proxy, err, location_changed = 0, redirects = 0;
63 HTTPContext *s = h->priv_data;
64 URLContext *hd = NULL;
65
66 proxy_path = getenv("http_proxy");
67 use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
f7d78f36 68 av_strstart(proxy_path, "http://", NULL);
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69
70 /* fill the dest addr */
71 redo:
72 /* needed in any case to build the host string */
c5c6e67c 73 ff_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
f984dcf6 74 path1, sizeof(path1), s->location);
57b5555c 75 ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
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76
77 if (use_proxy) {
c5c6e67c 78 ff_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
f984dcf6 79 NULL, 0, proxy_path);
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80 path = s->location;
81 } else {
82 if (path1[0] == '\0')
83 path = "/";
84 else
85 path = path1;
86 }
87 if (port < 0)
88 port = 80;
89
57b5555c 90 ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
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91 err = url_open(&hd, buf, URL_RDWR);
92 if (err < 0)
93 goto fail;
94
95 s->hd = hd;
96 if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
97 goto fail;
a3fd2bd8 98 if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) {
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99 /* url moved, get next */
100 url_close(hd);
101 if (redirects++ >= MAX_REDIRECTS)
6f3e0b21 102 return AVERROR(EIO);
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103 location_changed = 0;
104 goto redo;
105 }
106 return 0;
107 fail:
108 if (hd)
109 url_close(hd);
6f3e0b21 110 return AVERROR(EIO);
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111}
112
113static int http_open(URLContext *h, const char *uri, int flags)
114{
115 HTTPContext *s;
116 int ret;
117
118 h->is_streamed = 1;
119
120 s = av_malloc(sizeof(HTTPContext));
121 if (!s) {
122 return AVERROR(ENOMEM);
123 }
124 h->priv_data = s;
125 s->filesize = -1;
7995ed8e 126 s->chunksize = -1;
558b86a5 127 s->off = 0;
f7d78f36 128 av_strlcpy(s->location, uri, URL_SIZE);
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129
130 ret = http_open_cnx(h);
131 if (ret != 0)
132 av_free (s);
133 return ret;
134}
135static int http_getc(HTTPContext *s)
136{
137 int len;
138 if (s->buf_ptr >= s->buf_end) {
139 len = url_read(s->hd, s->buffer, BUFFER_SIZE);
140 if (len < 0) {
6f3e0b21 141 return AVERROR(EIO);
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142 } else if (len == 0) {
143 return -1;
144 } else {
145 s->buf_ptr = s->buffer;
146 s->buf_end = s->buffer + len;
147 }
148 }
149 return *s->buf_ptr++;
150}
151
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152static int http_get_line(HTTPContext *s, char *line, int line_size)
153{
154 int ch;
155 char *q;
156
157 q = line;
158 for(;;) {
159 ch = http_getc(s);
160 if (ch < 0)
161 return AVERROR(EIO);
162 if (ch == '\n') {
163 /* process line */
164 if (q > line && q[-1] == '\r')
165 q--;
166 *q = '\0';
167
168 return 0;
169 } else {
170 if ((q - line) < line_size - 1)
171 *q++ = ch;
172 }
173 }
174}
175
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176static int process_line(URLContext *h, char *line, int line_count,
177 int *new_location)
178{
179 HTTPContext *s = h->priv_data;
180 char *tag, *p;
181
182 /* end of header */
183 if (line[0] == '\0')
184 return 0;
185
186 p = line;
187 if (line_count == 0) {
188 while (!isspace(*p) && *p != '\0')
189 p++;
190 while (isspace(*p))
191 p++;
192 s->http_code = strtol(p, NULL, 10);
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193
194 dprintf(NULL, "http_code=%d\n", s->http_code);
195
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196 /* error codes are 4xx and 5xx */
197 if (s->http_code >= 400 && s->http_code < 600)
198 return -1;
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199 } else {
200 while (*p != '\0' && *p != ':')
201 p++;
202 if (*p != ':')
203 return 1;
204
205 *p = '\0';
206 tag = line;
207 p++;
208 while (isspace(*p))
209 p++;
210 if (!strcmp(tag, "Location")) {
211 strcpy(s->location, p);
212 *new_location = 1;
213 } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
214 s->filesize = atoll(p);
215 } else if (!strcmp (tag, "Content-Range")) {
216 /* "bytes $from-$to/$document_size" */
217 const char *slash;
218 if (!strncmp (p, "bytes ", 6)) {
219 p += 6;
220 s->off = atoll(p);
221 if ((slash = strchr(p, '/')) && strlen(slash) > 0)
222 s->filesize = atoll(slash+1);
223 }
224 h->is_streamed = 0; /* we _can_ in fact seek */
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225 } else if (!strcmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) {
226 s->filesize = -1;
227 s->chunksize = 0;
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228 }
229 }
230 return 1;
231}
232
233static int http_connect(URLContext *h, const char *path, const char *hoststr,
234 const char *auth, int *new_location)
235{
236 HTTPContext *s = h->priv_data;
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237 int post, err;
238 char line[1024];
558b86a5 239 char *auth_b64;
d176f903 240 int auth_b64_len = (strlen(auth) + 2) / 3 * 4 + 1;
bc5c918e 241 int64_t off = s->off;
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242
243
244 /* send http header */
245 post = h->flags & URL_WRONLY;
bd03c380 246 auth_b64 = av_malloc(auth_b64_len);
2907abed 247 av_base64_encode(auth_b64, auth_b64_len, auth, strlen(auth));
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248 snprintf(s->buffer, sizeof(s->buffer),
249 "%s %s HTTP/1.1\r\n"
250 "User-Agent: %s\r\n"
251 "Accept: */*\r\n"
252 "Range: bytes=%"PRId64"-\r\n"
253 "Host: %s\r\n"
254 "Authorization: Basic %s\r\n"
167c5531 255 "Connection: close\r\n"
08f7a8ac 256 "%s"
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257 "\r\n",
258 post ? "POST" : "GET",
259 path,
260 LIBAVFORMAT_IDENT,
261 s->off,
262 hoststr,
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263 auth_b64,
264 post ? "Transfer-Encoding: chunked\r\n" : "");
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265
266 av_freep(&auth_b64);
267 if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
6f3e0b21 268 return AVERROR(EIO);
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269
270 /* init input buffer */
271 s->buf_ptr = s->buffer;
272 s->buf_end = s->buffer;
273 s->line_count = 0;
274 s->off = 0;
ecb4a895 275 s->filesize = -1;
558b86a5 276 if (post) {
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277 /* always use chunked encoding for upload data */
278 s->chunksize = 0;
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279 return 0;
280 }
281
282 /* wait for header */
558b86a5 283 for(;;) {
682d49f4 284 if (http_get_line(s, line, sizeof(line)) < 0)
6f3e0b21 285 return AVERROR(EIO);
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286
287 dprintf(NULL, "header='%s'\n", line);
288
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289 err = process_line(h, line, s->line_count, new_location);
290 if (err < 0)
291 return err;
292 if (err == 0)
293 break;
294 s->line_count++;
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295 }
296
297 return (off == s->off) ? 0 : -1;
298}
299
300
301static int http_read(URLContext *h, uint8_t *buf, int size)
302{
303 HTTPContext *s = h->priv_data;
304 int len;
305
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306 if (s->chunksize >= 0) {
307 if (!s->chunksize) {
308 char line[32];
309
310 for(;;) {
311 do {
312 if (http_get_line(s, line, sizeof(line)) < 0)
313 return AVERROR(EIO);
314 } while (!*line); /* skip CR LF from last chunk */
315
316 s->chunksize = strtoll(line, NULL, 16);
317
318 dprintf(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
319
320 if (!s->chunksize)
321 return 0;
322 break;
323 }
324 }
325 size = FFMIN(size, s->chunksize);
326 }
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327 /* read bytes from input buffer first */
328 len = s->buf_end - s->buf_ptr;
329 if (len > 0) {
330 if (len > size)
331 len = size;
332 memcpy(buf, s->buf_ptr, len);
333 s->buf_ptr += len;
334 } else {
335 len = url_read(s->hd, buf, size);
336 }
7995ed8e 337 if (len > 0) {
558b86a5 338 s->off += len;
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339 if (s->chunksize > 0)
340 s->chunksize -= len;
341 }
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342 return len;
343}
344
345/* used only when posting data */
346static int http_write(URLContext *h, uint8_t *buf, int size)
347{
08f7a8ac
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348 char temp[11]; /* 32-bit hex + CRLF + nul */
349 int ret;
350 char crlf[] = "\r\n";
558b86a5 351 HTTPContext *s = h->priv_data;
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352
353 if (s->chunksize == -1) {
354 /* headers are sent without any special encoding */
2edabfdf 355 return url_write(s->hd, buf, size);
08f7a8ac
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356 }
357
358 /* silently ignore zero-size data since chunk encoding that would
359 * signal EOF */
360 if (size > 0) {
361 /* upload data using chunked encoding */
362 snprintf(temp, sizeof(temp), "%x\r\n", size);
363
364 if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 ||
365 (ret = url_write(s->hd, buf, size)) < 0 ||
366 (ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
367 return ret;
368 }
369 return size;
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370}
371
372static int http_close(URLContext *h)
373{
08f7a8ac
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374 int ret = 0;
375 char footer[] = "0\r\n\r\n";
558b86a5 376 HTTPContext *s = h->priv_data;
08f7a8ac
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377
378 /* signal end of chunked encoding if used */
379 if ((h->flags & URL_WRONLY) && s->chunksize != -1) {
380 ret = url_write(s->hd, footer, sizeof(footer) - 1);
381 ret = ret > 0 ? 0 : ret;
382 }
383
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384 url_close(s->hd);
385 av_free(s);
08f7a8ac 386 return ret;
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387}
388
bc5c918e 389static int64_t http_seek(URLContext *h, int64_t off, int whence)
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390{
391 HTTPContext *s = h->priv_data;
392 URLContext *old_hd = s->hd;
bc5c918e 393 int64_t old_off = s->off;
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394 uint8_t old_buf[BUFFER_SIZE];
395 int old_buf_size;
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396
397 if (whence == AVSEEK_SIZE)
398 return s->filesize;
399 else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
400 return -1;
401
402 /* we save the old context in case the seek fails */
08c8e66a
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403 old_buf_size = s->buf_end - s->buf_ptr;
404 memcpy(old_buf, s->buf_ptr, old_buf_size);
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405 s->hd = NULL;
406 if (whence == SEEK_CUR)
407 off += s->off;
408 else if (whence == SEEK_END)
409 off += s->filesize;
410 s->off = off;
411
412 /* if it fails, continue on old connection */
413 if (http_open_cnx(h) < 0) {
08c8e66a
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414 memcpy(s->buffer, old_buf, old_buf_size);
415 s->buf_ptr = s->buffer;
416 s->buf_end = s->buffer + old_buf_size;
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417 s->hd = old_hd;
418 s->off = old_off;
419 return -1;
420 }
421 url_close(old_hd);
422 return off;
423}
424
f0a80394
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425static int
426http_get_file_handle(URLContext *h)
427{
428 HTTPContext *s = h->priv_data;
429 return url_get_file_handle(s->hd);
430}
431
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432URLProtocol http_protocol = {
433 "http",
434 http_open,
435 http_read,
436 http_write,
437 http_seek,
438 http_close,
f0a80394 439 .url_get_file_handle = http_get_file_handle,
558b86a5 440};