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http.c
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1 /*
2  * HTTP protocol for ffmpeg client
3  * Copyright (c) 2000, 2001 Fabrice Bellard
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  */
21 
22 #include "config.h"
23 
24 #if CONFIG_ZLIB
25 #include <zlib.h>
26 #endif /* CONFIG_ZLIB */
27 
28 #include "libavutil/avstring.h"
29 #include "libavutil/opt.h"
30 
31 #include "avformat.h"
32 #include "http.h"
33 #include "httpauth.h"
34 #include "internal.h"
35 #include "network.h"
36 #include "os_support.h"
37 #include "url.h"
38 
39 /* XXX: POST protocol is not completely implemented because ffmpeg uses
40  * only a subset of it. */
41 
42 /* The IO buffer size is unrelated to the max URL size in itself, but needs
43  * to be large enough to fit the full request headers (including long
44  * path names). */
45 #define BUFFER_SIZE MAX_URL_SIZE
46 #define MAX_REDIRECTS 8
47 
48 typedef struct {
49  const AVClass *class;
51  unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
53  int http_code;
54  /* Used if "Transfer-Encoding: chunked" otherwise -1. */
55  int64_t chunksize;
56  int64_t off, end_off, filesize;
57  char *location;
60  char *headers;
61  char *mime_type;
62  char *user_agent;
63  char *content_type;
64  /* Set if the server correctly handles Connection: close and will close
65  * the connection after feeding us the content. */
66  int willclose;
67  int seekable; /**< Control seekability, 0 = disable, 1 = enable, -1 = probe. */
69  /* A flag which indicates if the end of chunked encoding has been sent. */
71  /* A flag which indicates we have finished to read POST reply. */
73  /* A flag which indicates if we use persistent connections. */
77  int is_akamai;
79  char *cookies; ///< holds newline (\n) delimited Set-Cookie header field values (without the "Set-Cookie: " field name)
80  int icy;
81  /* how much data was read since the last ICY metadata packet */
83  /* after how many bytes of read data a new metadata packet will be found */
88 #if CONFIG_ZLIB
89  int compressed;
90  z_stream inflate_stream;
91  uint8_t *inflate_buffer;
92 #endif /* CONFIG_ZLIB */
95  char *method;
96 } HTTPContext;
97 
98 #define OFFSET(x) offsetof(HTTPContext, x)
99 #define D AV_OPT_FLAG_DECODING_PARAM
100 #define E AV_OPT_FLAG_ENCODING_PARAM
101 #define DEFAULT_USER_AGENT "Lavf/" AV_STRINGIFY(LIBAVFORMAT_VERSION)
102 
103 static const AVOption options[] = {
104  { "seekable", "control seekability of connection", OFFSET(seekable), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, D },
105  { "chunked_post", "use chunked transfer-encoding for posts", OFFSET(chunked_post), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
106  { "headers", "set custom HTTP headers, can override built in default headers", OFFSET(headers), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D | E },
107  { "content_type", "set a specific content type for the POST messages", OFFSET(content_type), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D | E },
108  { "user_agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, { .str = DEFAULT_USER_AGENT }, 0, 0, D },
109  { "user-agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, { .str = DEFAULT_USER_AGENT }, 0, 0, D },
110  { "multiple_requests", "use persistent connections", OFFSET(multiple_requests), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, D | E },
111  { "post_data", "set custom HTTP post data", OFFSET(post_data), AV_OPT_TYPE_BINARY, .flags = D | E },
112  { "mime_type", "export the MIME type", OFFSET(mime_type), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
113  { "cookies", "set cookies to be sent in applicable future requests, use newline delimited Set-Cookie HTTP field value syntax", OFFSET(cookies), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D },
114  { "icy", "request ICY metadata", OFFSET(icy), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, D },
115  { "icy_metadata_headers", "return ICY metadata headers", OFFSET(icy_metadata_headers), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_EXPORT },
116  { "icy_metadata_packet", "return current ICY metadata packet", OFFSET(icy_metadata_packet), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_EXPORT },
117  { "metadata", "metadata read from the bitstream", OFFSET(metadata), AV_OPT_TYPE_DICT, {0}, 0, 0, AV_OPT_FLAG_EXPORT },
118  { "auth_type", "HTTP authentication type", OFFSET(auth_state.auth_type), AV_OPT_TYPE_INT, { .i64 = HTTP_AUTH_NONE }, HTTP_AUTH_NONE, HTTP_AUTH_BASIC, D | E, "auth_type"},
119  { "none", "No auth method set, autodetect", 0, AV_OPT_TYPE_CONST, { .i64 = HTTP_AUTH_NONE }, 0, 0, D | E, "auth_type"},
120  { "basic", "HTTP basic authentication", 0, AV_OPT_TYPE_CONST, { .i64 = HTTP_AUTH_BASIC }, 0, 0, D | E, "auth_type"},
121  { "send_expect_100", "Force sending an Expect: 100-continue header for POST", OFFSET(send_expect_100), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
122  { "location", "The actual location of the data received", OFFSET(location), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D | E },
123  { "offset", "initial byte offset", OFFSET(off), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, D },
124  { "end_offset", "try to limit the request to bytes preceding this offset", OFFSET(end_off), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, D },
125  { "method", "Override the HTTP method", OFFSET(method), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
126  { NULL }
127 };
128 
129 static int http_connect(URLContext *h, const char *path, const char *local_path,
130  const char *hoststr, const char *auth,
131  const char *proxyauth, int *new_location);
132 
134 {
135  memcpy(&((HTTPContext *)dest->priv_data)->auth_state,
136  &((HTTPContext *)src->priv_data)->auth_state,
137  sizeof(HTTPAuthState));
138  memcpy(&((HTTPContext *)dest->priv_data)->proxy_auth_state,
139  &((HTTPContext *)src->priv_data)->proxy_auth_state,
140  sizeof(HTTPAuthState));
141 }
142 
144 {
145  const char *path, *proxy_path, *lower_proto = "tcp", *local_path;
146  char hostname[1024], hoststr[1024], proto[10];
147  char auth[1024], proxyauth[1024] = "";
148  char path1[MAX_URL_SIZE];
149  char buf[1024], urlbuf[MAX_URL_SIZE];
150  int port, use_proxy, err, location_changed = 0;
151  HTTPContext *s = h->priv_data;
152 
153  av_url_split(proto, sizeof(proto), auth, sizeof(auth),
154  hostname, sizeof(hostname), &port,
155  path1, sizeof(path1), s->location);
156  ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
157 
158  proxy_path = getenv("http_proxy");
159  use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), hostname) &&
160  proxy_path && av_strstart(proxy_path, "http://", NULL);
161 
162  if (!strcmp(proto, "https")) {
163  lower_proto = "tls";
164  use_proxy = 0;
165  if (port < 0)
166  port = 443;
167  }
168  if (port < 0)
169  port = 80;
170 
171  if (path1[0] == '\0')
172  path = "/";
173  else
174  path = path1;
175  local_path = path;
176  if (use_proxy) {
177  /* Reassemble the request URL without auth string - we don't
178  * want to leak the auth to the proxy. */
179  ff_url_join(urlbuf, sizeof(urlbuf), proto, NULL, hostname, port, "%s",
180  path1);
181  path = urlbuf;
182  av_url_split(NULL, 0, proxyauth, sizeof(proxyauth),
183  hostname, sizeof(hostname), &port, NULL, 0, proxy_path);
184  }
185 
186  ff_url_join(buf, sizeof(buf), lower_proto, NULL, hostname, port, NULL);
187 
188  if (!s->hd) {
189  err = ffurl_open(&s->hd, buf, AVIO_FLAG_READ_WRITE,
190  &h->interrupt_callback, options);
191  if (err < 0)
192  return err;
193  }
194 
195  err = http_connect(h, path, local_path, hoststr,
196  auth, proxyauth, &location_changed);
197  if (err < 0)
198  return err;
199 
200  return location_changed;
201 }
202 
203 /* return non zero if error */
204 static int http_open_cnx(URLContext *h, AVDictionary **options)
205 {
206  HTTPAuthType cur_auth_type, cur_proxy_auth_type;
207  HTTPContext *s = h->priv_data;
208  int location_changed, attempts = 0, redirects = 0;
209 redo:
210  cur_auth_type = s->auth_state.auth_type;
211  cur_proxy_auth_type = s->auth_state.auth_type;
212 
213  location_changed = http_open_cnx_internal(h, options);
214  if (location_changed < 0)
215  goto fail;
216 
217  attempts++;
218  if (s->http_code == 401) {
219  if ((cur_auth_type == HTTP_AUTH_NONE || s->auth_state.stale) &&
220  s->auth_state.auth_type != HTTP_AUTH_NONE && attempts < 4) {
221  ffurl_closep(&s->hd);
222  goto redo;
223  } else
224  goto fail;
225  }
226  if (s->http_code == 407) {
227  if ((cur_proxy_auth_type == HTTP_AUTH_NONE || s->proxy_auth_state.stale) &&
228  s->proxy_auth_state.auth_type != HTTP_AUTH_NONE && attempts < 4) {
229  ffurl_closep(&s->hd);
230  goto redo;
231  } else
232  goto fail;
233  }
234  if ((s->http_code == 301 || s->http_code == 302 ||
235  s->http_code == 303 || s->http_code == 307) &&
236  location_changed == 1) {
237  /* url moved, get next */
238  ffurl_closep(&s->hd);
239  if (redirects++ >= MAX_REDIRECTS)
240  return AVERROR(EIO);
241  /* Restart the authentication process with the new target, which
242  * might use a different auth mechanism. */
243  memset(&s->auth_state, 0, sizeof(s->auth_state));
244  attempts = 0;
245  location_changed = 0;
246  goto redo;
247  }
248  return 0;
249 
250 fail:
251  if (s->hd)
252  ffurl_closep(&s->hd);
253  return ff_http_averror(s->http_code, AVERROR(EIO));
254 }
255 
256 int ff_http_do_new_request(URLContext *h, const char *uri)
257 {
258  HTTPContext *s = h->priv_data;
259  AVDictionary *options = NULL;
260  int ret;
261 
262  s->off = 0;
263  s->icy_data_read = 0;
264  av_free(s->location);
265  s->location = av_strdup(uri);
266  if (!s->location)
267  return AVERROR(ENOMEM);
268 
269  av_dict_copy(&options, s->chained_options, 0);
270  ret = http_open_cnx(h, &options);
271  av_dict_free(&options);
272  return ret;
273 }
274 
275 int ff_http_averror(int status_code, int default_averror)
276 {
277  switch (status_code) {
278  case 400: return AVERROR_HTTP_BAD_REQUEST;
279  case 401: return AVERROR_HTTP_UNAUTHORIZED;
280  case 403: return AVERROR_HTTP_FORBIDDEN;
281  case 404: return AVERROR_HTTP_NOT_FOUND;
282  default: break;
283  }
284  if (status_code >= 400 && status_code <= 499)
285  return AVERROR_HTTP_OTHER_4XX;
286  else if (status_code >= 500)
288  else
289  return default_averror;
290 }
291 
292 static int http_open(URLContext *h, const char *uri, int flags,
293  AVDictionary **options)
294 {
295  HTTPContext *s = h->priv_data;
296  int ret;
297 
298  if( s->seekable == 1 )
299  h->is_streamed = 0;
300  else
301  h->is_streamed = 1;
302 
303  s->filesize = -1;
304  s->location = av_strdup(uri);
305  if (!s->location)
306  return AVERROR(ENOMEM);
307  if (options)
308  av_dict_copy(&s->chained_options, *options, 0);
309 
310  if (s->headers) {
311  int len = strlen(s->headers);
312  if (len < 2 || strcmp("\r\n", s->headers + len - 2))
314  "No trailing CRLF found in HTTP header.\n");
315  }
316 
317  ret = http_open_cnx(h, options);
318  if (ret < 0)
320  return ret;
321 }
322 
323 static int http_getc(HTTPContext *s)
324 {
325  int len;
326  if (s->buf_ptr >= s->buf_end) {
327  len = ffurl_read(s->hd, s->buffer, BUFFER_SIZE);
328  if (len < 0) {
329  return len;
330  } else if (len == 0) {
331  return AVERROR_EOF;
332  } else {
333  s->buf_ptr = s->buffer;
334  s->buf_end = s->buffer + len;
335  }
336  }
337  return *s->buf_ptr++;
338 }
339 
340 static int http_get_line(HTTPContext *s, char *line, int line_size)
341 {
342  int ch;
343  char *q;
344 
345  q = line;
346  for (;;) {
347  ch = http_getc(s);
348  if (ch < 0)
349  return ch;
350  if (ch == '\n') {
351  /* process line */
352  if (q > line && q[-1] == '\r')
353  q--;
354  *q = '\0';
355 
356  return 0;
357  } else {
358  if ((q - line) < line_size - 1)
359  *q++ = ch;
360  }
361  }
362 }
363 
364 static int check_http_code(URLContext *h, int http_code, const char *end)
365 {
366  HTTPContext *s = h->priv_data;
367  /* error codes are 4xx and 5xx, but regard 401 as a success, so we
368  * don't abort until all headers have been parsed. */
369  if (http_code >= 400 && http_code < 600 &&
370  (http_code != 401 || s->auth_state.auth_type != HTTP_AUTH_NONE) &&
371  (http_code != 407 || s->proxy_auth_state.auth_type != HTTP_AUTH_NONE)) {
372  end += strspn(end, SPACE_CHARS);
373  av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n", http_code, end);
374  return ff_http_averror(http_code, AVERROR(EIO));
375  }
376  return 0;
377 }
378 
379 static int parse_location(HTTPContext *s, const char *p)
380 {
381  char redirected_location[MAX_URL_SIZE], *new_loc;
382  ff_make_absolute_url(redirected_location, sizeof(redirected_location),
383  s->location, p);
384  new_loc = av_strdup(redirected_location);
385  if (!new_loc)
386  return AVERROR(ENOMEM);
387  av_free(s->location);
388  s->location = new_loc;
389  return 0;
390 }
391 
392 /* "bytes $from-$to/$document_size" */
393 static void parse_content_range(URLContext *h, const char *p)
394 {
395  HTTPContext *s = h->priv_data;
396  const char *slash;
397 
398  if (!strncmp(p, "bytes ", 6)) {
399  p += 6;
400  s->off = strtoll(p, NULL, 10);
401  if ((slash = strchr(p, '/')) && strlen(slash) > 0)
402  s->filesize = strtoll(slash + 1, NULL, 10);
403  }
404  if (s->seekable == -1 && (!s->is_akamai || s->filesize != 2147483647))
405  h->is_streamed = 0; /* we _can_ in fact seek */
406 }
407 
408 static int parse_content_encoding(URLContext *h, const char *p)
409 {
410  if (!av_strncasecmp(p, "gzip", 4) ||
411  !av_strncasecmp(p, "deflate", 7)) {
412 #if CONFIG_ZLIB
413  HTTPContext *s = h->priv_data;
414 
415  s->compressed = 1;
416  inflateEnd(&s->inflate_stream);
417  if (inflateInit2(&s->inflate_stream, 32 + 15) != Z_OK) {
418  av_log(h, AV_LOG_WARNING, "Error during zlib initialisation: %s\n",
419  s->inflate_stream.msg);
420  return AVERROR(ENOSYS);
421  }
422  if (zlibCompileFlags() & (1 << 17)) {
424  "Your zlib was compiled without gzip support.\n");
425  return AVERROR(ENOSYS);
426  }
427 #else
429  "Compressed (%s) content, need zlib with gzip support\n", p);
430  return AVERROR(ENOSYS);
431 #endif /* CONFIG_ZLIB */
432  } else if (!av_strncasecmp(p, "identity", 8)) {
433  // The normal, no-encoding case (although servers shouldn't include
434  // the header at all if this is the case).
435  } else {
436  av_log(h, AV_LOG_WARNING, "Unknown content coding: %s\n", p);
437  }
438  return 0;
439 }
440 
441 // Concat all Icy- header lines
442 static int parse_icy(HTTPContext *s, const char *tag, const char *p)
443 {
444  int len = 4 + strlen(p) + strlen(tag);
445  int is_first = !s->icy_metadata_headers;
446  int ret;
447 
448  av_dict_set(&s->metadata, tag, p, 0);
449 
450  if (s->icy_metadata_headers)
451  len += strlen(s->icy_metadata_headers);
452 
453  if ((ret = av_reallocp(&s->icy_metadata_headers, len)) < 0)
454  return ret;
455 
456  if (is_first)
457  *s->icy_metadata_headers = '\0';
458 
459  av_strlcatf(s->icy_metadata_headers, len, "%s: %s\n", tag, p);
460 
461  return 0;
462 }
463 
464 static int process_line(URLContext *h, char *line, int line_count,
465  int *new_location)
466 {
467  HTTPContext *s = h->priv_data;
468  char *tag, *p, *end;
469  int ret;
470 
471  /* end of header */
472  if (line[0] == '\0') {
473  s->end_header = 1;
474  return 0;
475  }
476 
477  p = line;
478  if (line_count == 0) {
479  while (!av_isspace(*p) && *p != '\0')
480  p++;
481  while (av_isspace(*p))
482  p++;
483  s->http_code = strtol(p, &end, 10);
484 
485  av_log(h, AV_LOG_DEBUG, "http_code=%d\n", s->http_code);
486 
487  if ((ret = check_http_code(h, s->http_code, end)) < 0)
488  return ret;
489  } else {
490  while (*p != '\0' && *p != ':')
491  p++;
492  if (*p != ':')
493  return 1;
494 
495  *p = '\0';
496  tag = line;
497  p++;
498  while (av_isspace(*p))
499  p++;
500  if (!av_strcasecmp(tag, "Location")) {
501  if ((ret = parse_location(s, p)) < 0)
502  return ret;
503  *new_location = 1;
504  } else if (!av_strcasecmp(tag, "Content-Length") && s->filesize == -1) {
505  s->filesize = strtoll(p, NULL, 10);
506  } else if (!av_strcasecmp(tag, "Content-Range")) {
507  parse_content_range(h, p);
508  } else if (!av_strcasecmp(tag, "Accept-Ranges") &&
509  !strncmp(p, "bytes", 5) &&
510  s->seekable == -1) {
511  h->is_streamed = 0;
512  } else if (!av_strcasecmp(tag, "Transfer-Encoding") &&
513  !av_strncasecmp(p, "chunked", 7)) {
514  s->filesize = -1;
515  s->chunksize = 0;
516  } else if (!av_strcasecmp(tag, "WWW-Authenticate")) {
518  } else if (!av_strcasecmp(tag, "Authentication-Info")) {
520  } else if (!av_strcasecmp(tag, "Proxy-Authenticate")) {
522  } else if (!av_strcasecmp(tag, "Connection")) {
523  if (!strcmp(p, "close"))
524  s->willclose = 1;
525  } else if (!av_strcasecmp(tag, "Server")) {
526  if (!av_strcasecmp(p, "AkamaiGHost")) {
527  s->is_akamai = 1;
528  } else if (!av_strncasecmp(p, "MediaGateway", 12)) {
529  s->is_mediagateway = 1;
530  }
531  } else if (!av_strcasecmp(tag, "Content-Type")) {
532  av_free(s->mime_type);
533  s->mime_type = av_strdup(p);
534  } else if (!av_strcasecmp(tag, "Set-Cookie")) {
535  if (!s->cookies) {
536  if (!(s->cookies = av_strdup(p)))
537  return AVERROR(ENOMEM);
538  } else {
539  char *tmp = s->cookies;
540  size_t str_size = strlen(tmp) + strlen(p) + 2;
541  if (!(s->cookies = av_malloc(str_size))) {
542  s->cookies = tmp;
543  return AVERROR(ENOMEM);
544  }
545  snprintf(s->cookies, str_size, "%s\n%s", tmp, p);
546  av_free(tmp);
547  }
548  } else if (!av_strcasecmp(tag, "Icy-MetaInt")) {
549  s->icy_metaint = strtoll(p, NULL, 10);
550  } else if (!av_strncasecmp(tag, "Icy-", 4)) {
551  if ((ret = parse_icy(s, tag, p)) < 0)
552  return ret;
553  } else if (!av_strcasecmp(tag, "Content-Encoding")) {
554  if ((ret = parse_content_encoding(h, p)) < 0)
555  return ret;
556  }
557  }
558  return 1;
559 }
560 
561 /**
562  * Create a string containing cookie values for use as a HTTP cookie header
563  * field value for a particular path and domain from the cookie values stored in
564  * the HTTP protocol context. The cookie string is stored in *cookies.
565  *
566  * @return a negative value if an error condition occurred, 0 otherwise
567  */
568 static int get_cookies(HTTPContext *s, char **cookies, const char *path,
569  const char *domain)
570 {
571  // cookie strings will look like Set-Cookie header field values. Multiple
572  // Set-Cookie fields will result in multiple values delimited by a newline
573  int ret = 0;
574  char *next, *cookie, *set_cookies = av_strdup(s->cookies), *cset_cookies = set_cookies;
575 
576  if (!set_cookies) return AVERROR(EINVAL);
577 
578  *cookies = NULL;
579  while ((cookie = av_strtok(set_cookies, "\n", &next))) {
580  int domain_offset = 0;
581  char *param, *next_param, *cdomain = NULL, *cpath = NULL, *cvalue = NULL;
582  set_cookies = NULL;
583 
584  while ((param = av_strtok(cookie, "; ", &next_param))) {
585  if (cookie) {
586  // first key-value pair is the actual cookie value
587  cvalue = av_strdup(param);
588  cookie = NULL;
589  } else if (!av_strncasecmp("path=", param, 5)) {
590  av_free(cpath);
591  cpath = av_strdup(&param[5]);
592  } else if (!av_strncasecmp("domain=", param, 7)) {
593  // if the cookie specifies a sub-domain, skip the leading dot thereby
594  // supporting URLs that point to sub-domains and the master domain
595  int leading_dot = (param[7] == '.');
596  av_free(cdomain);
597  cdomain = av_strdup(&param[7+leading_dot]);
598  } else {
599  // ignore unknown attributes
600  }
601  }
602  if (!cdomain)
603  cdomain = av_strdup(domain);
604 
605  // ensure all of the necessary values are valid
606  if (!cdomain || !cpath || !cvalue) {
608  "Invalid cookie found, no value, path or domain specified\n");
609  goto done_cookie;
610  }
611 
612  // check if the request path matches the cookie path
613  if (av_strncasecmp(path, cpath, strlen(cpath)))
614  goto done_cookie;
615 
616  // the domain should be at least the size of our cookie domain
617  domain_offset = strlen(domain) - strlen(cdomain);
618  if (domain_offset < 0)
619  goto done_cookie;
620 
621  // match the cookie domain
622  if (av_strcasecmp(&domain[domain_offset], cdomain))
623  goto done_cookie;
624 
625  // cookie parameters match, so copy the value
626  if (!*cookies) {
627  if (!(*cookies = av_strdup(cvalue))) {
628  ret = AVERROR(ENOMEM);
629  goto done_cookie;
630  }
631  } else {
632  char *tmp = *cookies;
633  size_t str_size = strlen(cvalue) + strlen(*cookies) + 3;
634  if (!(*cookies = av_malloc(str_size))) {
635  ret = AVERROR(ENOMEM);
636  goto done_cookie;
637  }
638  snprintf(*cookies, str_size, "%s; %s", tmp, cvalue);
639  av_free(tmp);
640  }
641 
642  done_cookie:
643  av_free(cdomain);
644  av_free(cpath);
645  av_free(cvalue);
646  if (ret < 0) {
647  if (*cookies) av_freep(cookies);
648  av_free(cset_cookies);
649  return ret;
650  }
651  }
652 
653  av_free(cset_cookies);
654 
655  return 0;
656 }
657 
658 static inline int has_header(const char *str, const char *header)
659 {
660  /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
661  if (!str)
662  return 0;
663  return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
664 }
665 
666 static int http_read_header(URLContext *h, int *new_location)
667 {
668  HTTPContext *s = h->priv_data;
669  char line[MAX_URL_SIZE];
670  int err = 0;
671 
672  s->chunksize = -1;
673 
674  for (;;) {
675  if ((err = http_get_line(s, line, sizeof(line))) < 0)
676  return err;
677 
678  av_log(h, AV_LOG_DEBUG, "header='%s'\n", line);
679 
680  err = process_line(h, line, s->line_count, new_location);
681  if (err < 0)
682  return err;
683  if (err == 0)
684  break;
685  s->line_count++;
686  }
687 
688  if (s->seekable == -1 && s->is_mediagateway && s->filesize == 2000000000)
689  h->is_streamed = 1; /* we can in fact _not_ seek */
690 
691  return err;
692 }
693 
694 static int http_connect(URLContext *h, const char *path, const char *local_path,
695  const char *hoststr, const char *auth,
696  const char *proxyauth, int *new_location)
697 {
698  HTTPContext *s = h->priv_data;
699  int post, err;
700  char headers[HTTP_HEADERS_SIZE] = "";
701  char *authstr = NULL, *proxyauthstr = NULL;
702  int64_t off = s->off;
703  int len = 0;
704  const char *method;
705  int send_expect_100 = 0;
706 
707  /* send http header */
708  post = h->flags & AVIO_FLAG_WRITE;
709 
710  if (s->post_data) {
711  /* force POST method and disable chunked encoding when
712  * custom HTTP post data is set */
713  post = 1;
714  s->chunked_post = 0;
715  }
716 
717  if (s->method)
718  method = s->method;
719  else
720  method = post ? "POST" : "GET";
721 
722  authstr = ff_http_auth_create_response(&s->auth_state, auth,
723  local_path, method);
724  proxyauthstr = ff_http_auth_create_response(&s->proxy_auth_state, proxyauth,
725  local_path, method);
726  if (post && !s->post_data) {
727  send_expect_100 = s->send_expect_100;
728  /* The user has supplied authentication but we don't know the auth type,
729  * send Expect: 100-continue to get the 401 response including the
730  * WWW-Authenticate header, or an 100 continue if no auth actually
731  * is needed. */
732  if (auth && *auth &&
734  s->http_code != 401)
735  send_expect_100 = 1;
736  }
737 
738  /* set default headers if needed */
739  if (!has_header(s->headers, "\r\nUser-Agent: "))
740  len += av_strlcatf(headers + len, sizeof(headers) - len,
741  "User-Agent: %s\r\n", s->user_agent);
742  if (!has_header(s->headers, "\r\nAccept: "))
743  len += av_strlcpy(headers + len, "Accept: */*\r\n",
744  sizeof(headers) - len);
745  // Note: we send this on purpose even when s->off is 0 when we're probing,
746  // since it allows us to detect more reliably if a (non-conforming)
747  // server supports seeking by analysing the reply headers.
748  if (!has_header(s->headers, "\r\nRange: ") && !post && (s->off > 0 || s->end_off || s->seekable == -1)) {
749  len += av_strlcatf(headers + len, sizeof(headers) - len,
750  "Range: bytes=%"PRId64"-", s->off);
751  if (s->end_off)
752  len += av_strlcatf(headers + len, sizeof(headers) - len,
753  "%"PRId64, s->end_off - 1);
754  len += av_strlcpy(headers + len, "\r\n",
755  sizeof(headers) - len);
756  }
757  if (send_expect_100 && !has_header(s->headers, "\r\nExpect: "))
758  len += av_strlcatf(headers + len, sizeof(headers) - len,
759  "Expect: 100-continue\r\n");
760 
761  if (!has_header(s->headers, "\r\nConnection: ")) {
762  if (s->multiple_requests)
763  len += av_strlcpy(headers + len, "Connection: keep-alive\r\n",
764  sizeof(headers) - len);
765  else
766  len += av_strlcpy(headers + len, "Connection: close\r\n",
767  sizeof(headers) - len);
768  }
769 
770  if (!has_header(s->headers, "\r\nHost: "))
771  len += av_strlcatf(headers + len, sizeof(headers) - len,
772  "Host: %s\r\n", hoststr);
773  if (!has_header(s->headers, "\r\nContent-Length: ") && s->post_data)
774  len += av_strlcatf(headers + len, sizeof(headers) - len,
775  "Content-Length: %d\r\n", s->post_datalen);
776 
777  if (!has_header(s->headers, "\r\nContent-Type: ") && s->content_type)
778  len += av_strlcatf(headers + len, sizeof(headers) - len,
779  "Content-Type: %s\r\n", s->content_type);
780  if (!has_header(s->headers, "\r\nCookie: ") && s->cookies) {
781  char *cookies = NULL;
782  if (!get_cookies(s, &cookies, path, hoststr) && cookies) {
783  len += av_strlcatf(headers + len, sizeof(headers) - len,
784  "Cookie: %s\r\n", cookies);
785  av_free(cookies);
786  }
787  }
788  if (!has_header(s->headers, "\r\nIcy-MetaData: ") && s->icy)
789  len += av_strlcatf(headers + len, sizeof(headers) - len,
790  "Icy-MetaData: %d\r\n", 1);
791 
792  /* now add in custom headers */
793  if (s->headers)
794  av_strlcpy(headers + len, s->headers, sizeof(headers) - len);
795 
796  snprintf(s->buffer, sizeof(s->buffer),
797  "%s %s HTTP/1.1\r\n"
798  "%s"
799  "%s"
800  "%s"
801  "%s%s"
802  "\r\n",
803  method,
804  path,
805  post && s->chunked_post ? "Transfer-Encoding: chunked\r\n" : "",
806  headers,
807  authstr ? authstr : "",
808  proxyauthstr ? "Proxy-" : "", proxyauthstr ? proxyauthstr : "");
809 
810  av_log(h, AV_LOG_DEBUG, "request: %s\n", s->buffer);
811 
812  if ((err = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0)
813  goto done;
814 
815  if (s->post_data)
816  if ((err = ffurl_write(s->hd, s->post_data, s->post_datalen)) < 0)
817  goto done;
818 
819  /* init input buffer */
820  s->buf_ptr = s->buffer;
821  s->buf_end = s->buffer;
822  s->line_count = 0;
823  s->off = 0;
824  s->icy_data_read = 0;
825  s->filesize = -1;
826  s->willclose = 0;
827  s->end_chunked_post = 0;
828  s->end_header = 0;
829  if (post && !s->post_data && !send_expect_100) {
830  /* Pretend that it did work. We didn't read any header yet, since
831  * we've still to send the POST data, but the code calling this
832  * function will check http_code after we return. */
833  s->http_code = 200;
834  err = 0;
835  goto done;
836  }
837 
838  /* wait for header */
839  err = http_read_header(h, new_location);
840  if (err < 0)
841  goto done;
842 
843  err = (off == s->off) ? 0 : -1;
844 done:
845  av_freep(&authstr);
846  av_freep(&proxyauthstr);
847  return err;
848 }
849 
850 static int http_buf_read(URLContext *h, uint8_t *buf, int size)
851 {
852  HTTPContext *s = h->priv_data;
853  int len;
854  /* read bytes from input buffer first */
855  len = s->buf_end - s->buf_ptr;
856  if (len > 0) {
857  if (len > size)
858  len = size;
859  memcpy(buf, s->buf_ptr, len);
860  s->buf_ptr += len;
861  } else {
862  if ((!s->willclose || s->chunksize < 0) &&
863  s->filesize >= 0 && s->off >= s->filesize)
864  return AVERROR_EOF;
865  len = ffurl_read(s->hd, buf, size);
866  }
867  if (len > 0) {
868  s->off += len;
869  if (s->chunksize > 0)
870  s->chunksize -= len;
871  }
872  return len;
873 }
874 
875 #if CONFIG_ZLIB
876 #define DECOMPRESS_BUF_SIZE (256 * 1024)
877 static int http_buf_read_compressed(URLContext *h, uint8_t *buf, int size)
878 {
879  HTTPContext *s = h->priv_data;
880  int ret;
881 
882  if (!s->inflate_buffer) {
883  s->inflate_buffer = av_malloc(DECOMPRESS_BUF_SIZE);
884  if (!s->inflate_buffer)
885  return AVERROR(ENOMEM);
886  }
887 
888  if (s->inflate_stream.avail_in == 0) {
889  int read = http_buf_read(h, s->inflate_buffer, DECOMPRESS_BUF_SIZE);
890  if (read <= 0)
891  return read;
892  s->inflate_stream.next_in = s->inflate_buffer;
893  s->inflate_stream.avail_in = read;
894  }
895 
896  s->inflate_stream.avail_out = size;
897  s->inflate_stream.next_out = buf;
898 
899  ret = inflate(&s->inflate_stream, Z_SYNC_FLUSH);
900  if (ret != Z_OK && ret != Z_STREAM_END)
901  av_log(h, AV_LOG_WARNING, "inflate return value: %d, %s\n",
902  ret, s->inflate_stream.msg);
903 
904  return size - s->inflate_stream.avail_out;
905 }
906 #endif /* CONFIG_ZLIB */
907 
908 static int http_read_stream(URLContext *h, uint8_t *buf, int size)
909 {
910  HTTPContext *s = h->priv_data;
911  int err, new_location;
912 
913  if (!s->hd)
914  return AVERROR_EOF;
915 
916  if (s->end_chunked_post && !s->end_header) {
917  err = http_read_header(h, &new_location);
918  if (err < 0)
919  return err;
920  }
921 
922  if (s->chunksize >= 0) {
923  if (!s->chunksize) {
924  char line[32];
925 
926  do {
927  if ((err = http_get_line(s, line, sizeof(line))) < 0)
928  return err;
929  } while (!*line); /* skip CR LF from last chunk */
930 
931  s->chunksize = strtoll(line, NULL, 16);
932 
933  av_dlog(NULL, "Chunked encoding data size: %"PRId64"'\n",
934  s->chunksize);
935 
936  if (!s->chunksize)
937  return 0;
938  }
939  size = FFMIN(size, s->chunksize);
940  }
941 #if CONFIG_ZLIB
942  if (s->compressed)
943  return http_buf_read_compressed(h, buf, size);
944 #endif /* CONFIG_ZLIB */
945  return http_buf_read(h, buf, size);
946 }
947 
948 // Like http_read_stream(), but no short reads.
949 // Assumes partial reads are an error.
950 static int http_read_stream_all(URLContext *h, uint8_t *buf, int size)
951 {
952  int pos = 0;
953  while (pos < size) {
954  int len = http_read_stream(h, buf + pos, size - pos);
955  if (len < 0)
956  return len;
957  pos += len;
958  }
959  return pos;
960 }
961 
962 static void update_metadata(HTTPContext *s, char *data)
963 {
964  char *key;
965  char *val;
966  char *end;
967  char *next = data;
968 
969  while (*next) {
970  key = next;
971  val = strstr(key, "='");
972  if (!val)
973  break;
974  end = strstr(val, "';");
975  if (!end)
976  break;
977 
978  *val = '\0';
979  *end = '\0';
980  val += 2;
981 
982  av_dict_set(&s->metadata, key, val, 0);
983 
984  next = end + 2;
985  }
986 }
987 
988 static int store_icy(URLContext *h, int size)
989 {
990  HTTPContext *s = h->priv_data;
991  /* until next metadata packet */
992  int remaining = s->icy_metaint - s->icy_data_read;
993 
994  if (remaining < 0)
995  return AVERROR_INVALIDDATA;
996 
997  if (!remaining) {
998  /* The metadata packet is variable sized. It has a 1 byte header
999  * which sets the length of the packet (divided by 16). If it's 0,
1000  * the metadata doesn't change. After the packet, icy_metaint bytes
1001  * of normal data follows. */
1002  uint8_t ch;
1003  int len = http_read_stream_all(h, &ch, 1);
1004  if (len < 0)
1005  return len;
1006  if (ch > 0) {
1007  char data[255 * 16 + 1];
1008  int ret;
1009  len = ch * 16;
1010  ret = http_read_stream_all(h, data, len);
1011  if (ret < 0)
1012  return ret;
1013  data[len + 1] = 0;
1014  if ((ret = av_opt_set(s, "icy_metadata_packet", data, 0)) < 0)
1015  return ret;
1016  update_metadata(s, data);
1017  }
1018  s->icy_data_read = 0;
1019  remaining = s->icy_metaint;
1020  }
1021 
1022  return FFMIN(size, remaining);
1023 }
1024 
1025 static int http_read(URLContext *h, uint8_t *buf, int size)
1026 {
1027  HTTPContext *s = h->priv_data;
1028 
1029  if (s->icy_metaint > 0) {
1030  size = store_icy(h, size);
1031  if (size < 0)
1032  return size;
1033  }
1034 
1035  size = http_read_stream(h, buf, size);
1036  if (size > 0)
1037  s->icy_data_read += size;
1038  return size;
1039 }
1040 
1041 /* used only when posting data */
1042 static int http_write(URLContext *h, const uint8_t *buf, int size)
1043 {
1044  char temp[11] = ""; /* 32-bit hex + CRLF + nul */
1045  int ret;
1046  char crlf[] = "\r\n";
1047  HTTPContext *s = h->priv_data;
1048 
1049  if (!s->chunked_post) {
1050  /* non-chunked data is sent without any special encoding */
1051  return ffurl_write(s->hd, buf, size);
1052  }
1053 
1054  /* silently ignore zero-size data since chunk encoding that would
1055  * signal EOF */
1056  if (size > 0) {
1057  /* upload data using chunked encoding */
1058  snprintf(temp, sizeof(temp), "%x\r\n", size);
1059 
1060  if ((ret = ffurl_write(s->hd, temp, strlen(temp))) < 0 ||
1061  (ret = ffurl_write(s->hd, buf, size)) < 0 ||
1062  (ret = ffurl_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
1063  return ret;
1064  }
1065  return size;
1066 }
1067 
1068 static int http_shutdown(URLContext *h, int flags)
1069 {
1070  int ret = 0;
1071  char footer[] = "0\r\n\r\n";
1072  HTTPContext *s = h->priv_data;
1073 
1074  /* signal end of chunked encoding if used */
1075  if ((flags & AVIO_FLAG_WRITE) && s->chunked_post) {
1076  ret = ffurl_write(s->hd, footer, sizeof(footer) - 1);
1077  ret = ret > 0 ? 0 : ret;
1078  s->end_chunked_post = 1;
1079  }
1080 
1081  return ret;
1082 }
1083 
1084 static int http_close(URLContext *h)
1085 {
1086  int ret = 0;
1087  HTTPContext *s = h->priv_data;
1088 
1089 #if CONFIG_ZLIB
1090  inflateEnd(&s->inflate_stream);
1091  av_freep(&s->inflate_buffer);
1092 #endif /* CONFIG_ZLIB */
1093 
1094  if (!s->end_chunked_post)
1095  /* Close the write direction by sending the end of chunked encoding. */
1096  ret = http_shutdown(h, h->flags);
1097 
1098  if (s->hd)
1099  ffurl_closep(&s->hd);
1101  return ret;
1102 }
1103 
1104 static int64_t http_seek(URLContext *h, int64_t off, int whence)
1105 {
1106  HTTPContext *s = h->priv_data;
1107  URLContext *old_hd = s->hd;
1108  int64_t old_off = s->off;
1109  uint8_t old_buf[BUFFER_SIZE];
1110  int old_buf_size, ret;
1111  AVDictionary *options = NULL;
1112 
1113  if (whence == AVSEEK_SIZE)
1114  return s->filesize;
1115  else if ((whence == SEEK_CUR && off == 0) ||
1116  (whence == SEEK_SET && off == s->off))
1117  return s->off;
1118  else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
1119  return AVERROR(ENOSYS);
1120 
1121  if (whence == SEEK_CUR)
1122  off += s->off;
1123  else if (whence == SEEK_END)
1124  off += s->filesize;
1125  else if (whence != SEEK_SET)
1126  return AVERROR(EINVAL);
1127  if (off < 0)
1128  return AVERROR(EINVAL);
1129  s->off = off;
1130 
1131  /* we save the old context in case the seek fails */
1132  old_buf_size = s->buf_end - s->buf_ptr;
1133  memcpy(old_buf, s->buf_ptr, old_buf_size);
1134  s->hd = NULL;
1135 
1136  /* if it fails, continue on old connection */
1137  av_dict_copy(&options, s->chained_options, 0);
1138  if ((ret = http_open_cnx(h, &options)) < 0) {
1139  av_dict_free(&options);
1140  memcpy(s->buffer, old_buf, old_buf_size);
1141  s->buf_ptr = s->buffer;
1142  s->buf_end = s->buffer + old_buf_size;
1143  s->hd = old_hd;
1144  s->off = old_off;
1145  return ret;
1146  }
1147  av_dict_free(&options);
1148  ffurl_close(old_hd);
1149  return off;
1150 }
1151 
1153 {
1154  HTTPContext *s = h->priv_data;
1155  return ffurl_get_file_handle(s->hd);
1156 }
1157 
1158 #define HTTP_CLASS(flavor) \
1159 static const AVClass flavor ## _context_class = { \
1160  .class_name = # flavor, \
1161  .item_name = av_default_item_name, \
1162  .option = options, \
1163  .version = LIBAVUTIL_VERSION_INT, \
1164 }
1165 
1166 #if CONFIG_HTTP_PROTOCOL
1167 HTTP_CLASS(http);
1168 
1169 URLProtocol ff_http_protocol = {
1170  .name = "http",
1171  .url_open2 = http_open,
1172  .url_read = http_read,
1173  .url_write = http_write,
1174  .url_seek = http_seek,
1175  .url_close = http_close,
1176  .url_get_file_handle = http_get_file_handle,
1177  .url_shutdown = http_shutdown,
1178  .priv_data_size = sizeof(HTTPContext),
1179  .priv_data_class = &http_context_class,
1181 };
1182 #endif /* CONFIG_HTTP_PROTOCOL */
1183 
1184 #if CONFIG_HTTPS_PROTOCOL
1185 HTTP_CLASS(https);
1186 
1187 URLProtocol ff_https_protocol = {
1188  .name = "https",
1189  .url_open2 = http_open,
1190  .url_read = http_read,
1191  .url_write = http_write,
1192  .url_seek = http_seek,
1193  .url_close = http_close,
1194  .url_get_file_handle = http_get_file_handle,
1195  .url_shutdown = http_shutdown,
1196  .priv_data_size = sizeof(HTTPContext),
1197  .priv_data_class = &https_context_class,
1199 };
1200 #endif /* CONFIG_HTTPS_PROTOCOL */
1201 
1202 #if CONFIG_HTTPPROXY_PROTOCOL
1203 static int http_proxy_close(URLContext *h)
1204 {
1205  HTTPContext *s = h->priv_data;
1206  if (s->hd)
1207  ffurl_closep(&s->hd);
1208  return 0;
1209 }
1210 
1211 static int http_proxy_open(URLContext *h, const char *uri, int flags)
1212 {
1213  HTTPContext *s = h->priv_data;
1214  char hostname[1024], hoststr[1024];
1215  char auth[1024], pathbuf[1024], *path;
1216  char lower_url[100];
1217  int port, ret = 0, attempts = 0;
1218  HTTPAuthType cur_auth_type;
1219  char *authstr;
1220  int new_loc;
1221 
1222  if( s->seekable == 1 )
1223  h->is_streamed = 0;
1224  else
1225  h->is_streamed = 1;
1226 
1227  av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
1228  pathbuf, sizeof(pathbuf), uri);
1229  ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
1230  path = pathbuf;
1231  if (*path == '/')
1232  path++;
1233 
1234  ff_url_join(lower_url, sizeof(lower_url), "tcp", NULL, hostname, port,
1235  NULL);
1236 redo:
1237  ret = ffurl_open(&s->hd, lower_url, AVIO_FLAG_READ_WRITE,
1238  &h->interrupt_callback, NULL);
1239  if (ret < 0)
1240  return ret;
1241 
1242  authstr = ff_http_auth_create_response(&s->proxy_auth_state, auth,
1243  path, "CONNECT");
1244  snprintf(s->buffer, sizeof(s->buffer),
1245  "CONNECT %s HTTP/1.1\r\n"
1246  "Host: %s\r\n"
1247  "Connection: close\r\n"
1248  "%s%s"
1249  "\r\n",
1250  path,
1251  hoststr,
1252  authstr ? "Proxy-" : "", authstr ? authstr : "");
1253  av_freep(&authstr);
1254 
1255  if ((ret = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0)
1256  goto fail;
1257 
1258  s->buf_ptr = s->buffer;
1259  s->buf_end = s->buffer;
1260  s->line_count = 0;
1261  s->filesize = -1;
1262  cur_auth_type = s->proxy_auth_state.auth_type;
1263 
1264  /* Note: This uses buffering, potentially reading more than the
1265  * HTTP header. If tunneling a protocol where the server starts
1266  * the conversation, we might buffer part of that here, too.
1267  * Reading that requires using the proper ffurl_read() function
1268  * on this URLContext, not using the fd directly (as the tls
1269  * protocol does). This shouldn't be an issue for tls though,
1270  * since the client starts the conversation there, so there
1271  * is no extra data that we might buffer up here.
1272  */
1273  ret = http_read_header(h, &new_loc);
1274  if (ret < 0)
1275  goto fail;
1276 
1277  attempts++;
1278  if (s->http_code == 407 &&
1279  (cur_auth_type == HTTP_AUTH_NONE || s->proxy_auth_state.stale) &&
1280  s->proxy_auth_state.auth_type != HTTP_AUTH_NONE && attempts < 2) {
1281  ffurl_closep(&s->hd);
1282  goto redo;
1283  }
1284 
1285  if (s->http_code < 400)
1286  return 0;
1287  ret = ff_http_averror(s->http_code, AVERROR(EIO));
1288 
1289 fail:
1290  http_proxy_close(h);
1291  return ret;
1292 }
1293 
1294 static int http_proxy_write(URLContext *h, const uint8_t *buf, int size)
1295 {
1296  HTTPContext *s = h->priv_data;
1297  return ffurl_write(s->hd, buf, size);
1298 }
1299 
1300 URLProtocol ff_httpproxy_protocol = {
1301  .name = "httpproxy",
1302  .url_open = http_proxy_open,
1303  .url_read = http_buf_read,
1304  .url_write = http_proxy_write,
1305  .url_close = http_proxy_close,
1306  .url_get_file_handle = http_get_file_handle,
1307  .priv_data_size = sizeof(HTTPContext),
1308  .flags = URL_PROTOCOL_FLAG_NETWORK,
1309 };
1310 #endif /* CONFIG_HTTPPROXY_PROTOCOL */