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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  av_dict_copy(options, s->chained_options, 0);
211 
212  cur_auth_type = s->auth_state.auth_type;
213  cur_proxy_auth_type = s->auth_state.auth_type;
214 
215  location_changed = http_open_cnx_internal(h, options);
216  if (location_changed < 0)
217  goto fail;
218 
219  attempts++;
220  if (s->http_code == 401) {
221  if ((cur_auth_type == HTTP_AUTH_NONE || s->auth_state.stale) &&
222  s->auth_state.auth_type != HTTP_AUTH_NONE && attempts < 4) {
223  ffurl_closep(&s->hd);
224  goto redo;
225  } else
226  goto fail;
227  }
228  if (s->http_code == 407) {
229  if ((cur_proxy_auth_type == HTTP_AUTH_NONE || s->proxy_auth_state.stale) &&
230  s->proxy_auth_state.auth_type != HTTP_AUTH_NONE && attempts < 4) {
231  ffurl_closep(&s->hd);
232  goto redo;
233  } else
234  goto fail;
235  }
236  if ((s->http_code == 301 || s->http_code == 302 ||
237  s->http_code == 303 || s->http_code == 307) &&
238  location_changed == 1) {
239  /* url moved, get next */
240  ffurl_closep(&s->hd);
241  if (redirects++ >= MAX_REDIRECTS)
242  return AVERROR(EIO);
243  /* Restart the authentication process with the new target, which
244  * might use a different auth mechanism. */
245  memset(&s->auth_state, 0, sizeof(s->auth_state));
246  attempts = 0;
247  location_changed = 0;
248  goto redo;
249  }
250  return 0;
251 
252 fail:
253  if (s->hd)
254  ffurl_closep(&s->hd);
255  if (location_changed < 0)
256  return location_changed;
257  return ff_http_averror(s->http_code, AVERROR(EIO));
258 }
259 
260 int ff_http_do_new_request(URLContext *h, const char *uri)
261 {
262  HTTPContext *s = h->priv_data;
263  AVDictionary *options = NULL;
264  int ret;
265 
266  s->off = 0;
267  s->icy_data_read = 0;
268  av_free(s->location);
269  s->location = av_strdup(uri);
270  if (!s->location)
271  return AVERROR(ENOMEM);
272 
273  ret = http_open_cnx(h, &options);
274  av_dict_free(&options);
275  return ret;
276 }
277 
278 int ff_http_averror(int status_code, int default_averror)
279 {
280  switch (status_code) {
281  case 400: return AVERROR_HTTP_BAD_REQUEST;
282  case 401: return AVERROR_HTTP_UNAUTHORIZED;
283  case 403: return AVERROR_HTTP_FORBIDDEN;
284  case 404: return AVERROR_HTTP_NOT_FOUND;
285  default: break;
286  }
287  if (status_code >= 400 && status_code <= 499)
288  return AVERROR_HTTP_OTHER_4XX;
289  else if (status_code >= 500)
291  else
292  return default_averror;
293 }
294 
295 static int http_open(URLContext *h, const char *uri, int flags,
296  AVDictionary **options)
297 {
298  HTTPContext *s = h->priv_data;
299  int ret;
300 
301  if( s->seekable == 1 )
302  h->is_streamed = 0;
303  else
304  h->is_streamed = 1;
305 
306  s->filesize = -1;
307  s->location = av_strdup(uri);
308  if (!s->location)
309  return AVERROR(ENOMEM);
310  if (options)
311  av_dict_copy(&s->chained_options, *options, 0);
312 
313  if (s->headers) {
314  int len = strlen(s->headers);
315  if (len < 2 || strcmp("\r\n", s->headers + len - 2))
317  "No trailing CRLF found in HTTP header.\n");
318  }
319 
320  ret = http_open_cnx(h, options);
321  if (ret < 0)
323  return ret;
324 }
325 
326 static int http_getc(HTTPContext *s)
327 {
328  int len;
329  if (s->buf_ptr >= s->buf_end) {
330  len = ffurl_read(s->hd, s->buffer, BUFFER_SIZE);
331  if (len < 0) {
332  return len;
333  } else if (len == 0) {
334  return AVERROR_EOF;
335  } else {
336  s->buf_ptr = s->buffer;
337  s->buf_end = s->buffer + len;
338  }
339  }
340  return *s->buf_ptr++;
341 }
342 
343 static int http_get_line(HTTPContext *s, char *line, int line_size)
344 {
345  int ch;
346  char *q;
347 
348  q = line;
349  for (;;) {
350  ch = http_getc(s);
351  if (ch < 0)
352  return ch;
353  if (ch == '\n') {
354  /* process line */
355  if (q > line && q[-1] == '\r')
356  q--;
357  *q = '\0';
358 
359  return 0;
360  } else {
361  if ((q - line) < line_size - 1)
362  *q++ = ch;
363  }
364  }
365 }
366 
367 static int check_http_code(URLContext *h, int http_code, const char *end)
368 {
369  HTTPContext *s = h->priv_data;
370  /* error codes are 4xx and 5xx, but regard 401 as a success, so we
371  * don't abort until all headers have been parsed. */
372  if (http_code >= 400 && http_code < 600 &&
373  (http_code != 401 || s->auth_state.auth_type != HTTP_AUTH_NONE) &&
374  (http_code != 407 || s->proxy_auth_state.auth_type != HTTP_AUTH_NONE)) {
375  end += strspn(end, SPACE_CHARS);
376  av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n", http_code, end);
377  return ff_http_averror(http_code, AVERROR(EIO));
378  }
379  return 0;
380 }
381 
382 static int parse_location(HTTPContext *s, const char *p)
383 {
384  char redirected_location[MAX_URL_SIZE], *new_loc;
385  ff_make_absolute_url(redirected_location, sizeof(redirected_location),
386  s->location, p);
387  new_loc = av_strdup(redirected_location);
388  if (!new_loc)
389  return AVERROR(ENOMEM);
390  av_free(s->location);
391  s->location = new_loc;
392  return 0;
393 }
394 
395 /* "bytes $from-$to/$document_size" */
396 static void parse_content_range(URLContext *h, const char *p)
397 {
398  HTTPContext *s = h->priv_data;
399  const char *slash;
400 
401  if (!strncmp(p, "bytes ", 6)) {
402  p += 6;
403  s->off = strtoll(p, NULL, 10);
404  if ((slash = strchr(p, '/')) && strlen(slash) > 0)
405  s->filesize = strtoll(slash + 1, NULL, 10);
406  }
407  if (s->seekable == -1 && (!s->is_akamai || s->filesize != 2147483647))
408  h->is_streamed = 0; /* we _can_ in fact seek */
409 }
410 
411 static int parse_content_encoding(URLContext *h, const char *p)
412 {
413  if (!av_strncasecmp(p, "gzip", 4) ||
414  !av_strncasecmp(p, "deflate", 7)) {
415 #if CONFIG_ZLIB
416  HTTPContext *s = h->priv_data;
417 
418  s->compressed = 1;
419  inflateEnd(&s->inflate_stream);
420  if (inflateInit2(&s->inflate_stream, 32 + 15) != Z_OK) {
421  av_log(h, AV_LOG_WARNING, "Error during zlib initialisation: %s\n",
422  s->inflate_stream.msg);
423  return AVERROR(ENOSYS);
424  }
425  if (zlibCompileFlags() & (1 << 17)) {
427  "Your zlib was compiled without gzip support.\n");
428  return AVERROR(ENOSYS);
429  }
430 #else
432  "Compressed (%s) content, need zlib with gzip support\n", p);
433  return AVERROR(ENOSYS);
434 #endif /* CONFIG_ZLIB */
435  } else if (!av_strncasecmp(p, "identity", 8)) {
436  // The normal, no-encoding case (although servers shouldn't include
437  // the header at all if this is the case).
438  } else {
439  av_log(h, AV_LOG_WARNING, "Unknown content coding: %s\n", p);
440  }
441  return 0;
442 }
443 
444 // Concat all Icy- header lines
445 static int parse_icy(HTTPContext *s, const char *tag, const char *p)
446 {
447  int len = 4 + strlen(p) + strlen(tag);
448  int is_first = !s->icy_metadata_headers;
449  int ret;
450 
451  av_dict_set(&s->metadata, tag, p, 0);
452 
453  if (s->icy_metadata_headers)
454  len += strlen(s->icy_metadata_headers);
455 
456  if ((ret = av_reallocp(&s->icy_metadata_headers, len)) < 0)
457  return ret;
458 
459  if (is_first)
460  *s->icy_metadata_headers = '\0';
461 
462  av_strlcatf(s->icy_metadata_headers, len, "%s: %s\n", tag, p);
463 
464  return 0;
465 }
466 
467 static int process_line(URLContext *h, char *line, int line_count,
468  int *new_location)
469 {
470  HTTPContext *s = h->priv_data;
471  char *tag, *p, *end;
472  int ret;
473 
474  /* end of header */
475  if (line[0] == '\0') {
476  s->end_header = 1;
477  return 0;
478  }
479 
480  p = line;
481  if (line_count == 0) {
482  while (!av_isspace(*p) && *p != '\0')
483  p++;
484  while (av_isspace(*p))
485  p++;
486  s->http_code = strtol(p, &end, 10);
487 
488  av_log(h, AV_LOG_DEBUG, "http_code=%d\n", s->http_code);
489 
490  if ((ret = check_http_code(h, s->http_code, end)) < 0)
491  return ret;
492  } else {
493  while (*p != '\0' && *p != ':')
494  p++;
495  if (*p != ':')
496  return 1;
497 
498  *p = '\0';
499  tag = line;
500  p++;
501  while (av_isspace(*p))
502  p++;
503  if (!av_strcasecmp(tag, "Location")) {
504  if ((ret = parse_location(s, p)) < 0)
505  return ret;
506  *new_location = 1;
507  } else if (!av_strcasecmp(tag, "Content-Length") && s->filesize == -1) {
508  s->filesize = strtoll(p, NULL, 10);
509  } else if (!av_strcasecmp(tag, "Content-Range")) {
510  parse_content_range(h, p);
511  } else if (!av_strcasecmp(tag, "Accept-Ranges") &&
512  !strncmp(p, "bytes", 5) &&
513  s->seekable == -1) {
514  h->is_streamed = 0;
515  } else if (!av_strcasecmp(tag, "Transfer-Encoding") &&
516  !av_strncasecmp(p, "chunked", 7)) {
517  s->filesize = -1;
518  s->chunksize = 0;
519  } else if (!av_strcasecmp(tag, "WWW-Authenticate")) {
521  } else if (!av_strcasecmp(tag, "Authentication-Info")) {
523  } else if (!av_strcasecmp(tag, "Proxy-Authenticate")) {
525  } else if (!av_strcasecmp(tag, "Connection")) {
526  if (!strcmp(p, "close"))
527  s->willclose = 1;
528  } else if (!av_strcasecmp(tag, "Server")) {
529  if (!av_strcasecmp(p, "AkamaiGHost")) {
530  s->is_akamai = 1;
531  } else if (!av_strncasecmp(p, "MediaGateway", 12)) {
532  s->is_mediagateway = 1;
533  }
534  } else if (!av_strcasecmp(tag, "Content-Type")) {
535  av_free(s->mime_type);
536  s->mime_type = av_strdup(p);
537  } else if (!av_strcasecmp(tag, "Set-Cookie")) {
538  if (!s->cookies) {
539  if (!(s->cookies = av_strdup(p)))
540  return AVERROR(ENOMEM);
541  } else {
542  char *tmp = s->cookies;
543  size_t str_size = strlen(tmp) + strlen(p) + 2;
544  if (!(s->cookies = av_malloc(str_size))) {
545  s->cookies = tmp;
546  return AVERROR(ENOMEM);
547  }
548  snprintf(s->cookies, str_size, "%s\n%s", tmp, p);
549  av_free(tmp);
550  }
551  } else if (!av_strcasecmp(tag, "Icy-MetaInt")) {
552  s->icy_metaint = strtoll(p, NULL, 10);
553  } else if (!av_strncasecmp(tag, "Icy-", 4)) {
554  if ((ret = parse_icy(s, tag, p)) < 0)
555  return ret;
556  } else if (!av_strcasecmp(tag, "Content-Encoding")) {
557  if ((ret = parse_content_encoding(h, p)) < 0)
558  return ret;
559  }
560  }
561  return 1;
562 }
563 
564 /**
565  * Create a string containing cookie values for use as a HTTP cookie header
566  * field value for a particular path and domain from the cookie values stored in
567  * the HTTP protocol context. The cookie string is stored in *cookies.
568  *
569  * @return a negative value if an error condition occurred, 0 otherwise
570  */
571 static int get_cookies(HTTPContext *s, char **cookies, const char *path,
572  const char *domain)
573 {
574  // cookie strings will look like Set-Cookie header field values. Multiple
575  // Set-Cookie fields will result in multiple values delimited by a newline
576  int ret = 0;
577  char *next, *cookie, *set_cookies = av_strdup(s->cookies), *cset_cookies = set_cookies;
578 
579  if (!set_cookies) return AVERROR(EINVAL);
580 
581  *cookies = NULL;
582  while ((cookie = av_strtok(set_cookies, "\n", &next))) {
583  int domain_offset = 0;
584  char *param, *next_param, *cdomain = NULL, *cpath = NULL, *cvalue = NULL;
585  set_cookies = NULL;
586 
587  while ((param = av_strtok(cookie, "; ", &next_param))) {
588  if (cookie) {
589  // first key-value pair is the actual cookie value
590  cvalue = av_strdup(param);
591  cookie = NULL;
592  } else if (!av_strncasecmp("path=", param, 5)) {
593  av_free(cpath);
594  cpath = av_strdup(&param[5]);
595  } else if (!av_strncasecmp("domain=", param, 7)) {
596  // if the cookie specifies a sub-domain, skip the leading dot thereby
597  // supporting URLs that point to sub-domains and the master domain
598  int leading_dot = (param[7] == '.');
599  av_free(cdomain);
600  cdomain = av_strdup(&param[7+leading_dot]);
601  } else {
602  // ignore unknown attributes
603  }
604  }
605  if (!cdomain)
606  cdomain = av_strdup(domain);
607 
608  // ensure all of the necessary values are valid
609  if (!cdomain || !cpath || !cvalue) {
611  "Invalid cookie found, no value, path or domain specified\n");
612  goto done_cookie;
613  }
614 
615  // check if the request path matches the cookie path
616  if (av_strncasecmp(path, cpath, strlen(cpath)))
617  goto done_cookie;
618 
619  // the domain should be at least the size of our cookie domain
620  domain_offset = strlen(domain) - strlen(cdomain);
621  if (domain_offset < 0)
622  goto done_cookie;
623 
624  // match the cookie domain
625  if (av_strcasecmp(&domain[domain_offset], cdomain))
626  goto done_cookie;
627 
628  // cookie parameters match, so copy the value
629  if (!*cookies) {
630  if (!(*cookies = av_strdup(cvalue))) {
631  ret = AVERROR(ENOMEM);
632  goto done_cookie;
633  }
634  } else {
635  char *tmp = *cookies;
636  size_t str_size = strlen(cvalue) + strlen(*cookies) + 3;
637  if (!(*cookies = av_malloc(str_size))) {
638  ret = AVERROR(ENOMEM);
639  goto done_cookie;
640  }
641  snprintf(*cookies, str_size, "%s; %s", tmp, cvalue);
642  av_free(tmp);
643  }
644 
645  done_cookie:
646  av_freep(&cdomain);
647  av_freep(&cpath);
648  av_freep(&cvalue);
649  if (ret < 0) {
650  if (*cookies) av_freep(cookies);
651  av_free(cset_cookies);
652  return ret;
653  }
654  }
655 
656  av_free(cset_cookies);
657 
658  return 0;
659 }
660 
661 static inline int has_header(const char *str, const char *header)
662 {
663  /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
664  if (!str)
665  return 0;
666  return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
667 }
668 
669 static int http_read_header(URLContext *h, int *new_location)
670 {
671  HTTPContext *s = h->priv_data;
672  char line[MAX_URL_SIZE];
673  int err = 0;
674 
675  s->chunksize = -1;
676 
677  for (;;) {
678  if ((err = http_get_line(s, line, sizeof(line))) < 0)
679  return err;
680 
681  av_log(h, AV_LOG_DEBUG, "header='%s'\n", line);
682 
683  err = process_line(h, line, s->line_count, new_location);
684  if (err < 0)
685  return err;
686  if (err == 0)
687  break;
688  s->line_count++;
689  }
690 
691  if (s->seekable == -1 && s->is_mediagateway && s->filesize == 2000000000)
692  h->is_streamed = 1; /* we can in fact _not_ seek */
693 
694  return err;
695 }
696 
697 static int http_connect(URLContext *h, const char *path, const char *local_path,
698  const char *hoststr, const char *auth,
699  const char *proxyauth, int *new_location)
700 {
701  HTTPContext *s = h->priv_data;
702  int post, err;
703  char headers[HTTP_HEADERS_SIZE] = "";
704  char *authstr = NULL, *proxyauthstr = NULL;
705  int64_t off = s->off;
706  int len = 0;
707  const char *method;
708  int send_expect_100 = 0;
709 
710  /* send http header */
711  post = h->flags & AVIO_FLAG_WRITE;
712 
713  if (s->post_data) {
714  /* force POST method and disable chunked encoding when
715  * custom HTTP post data is set */
716  post = 1;
717  s->chunked_post = 0;
718  }
719 
720  if (s->method)
721  method = s->method;
722  else
723  method = post ? "POST" : "GET";
724 
725  authstr = ff_http_auth_create_response(&s->auth_state, auth,
726  local_path, method);
727  proxyauthstr = ff_http_auth_create_response(&s->proxy_auth_state, proxyauth,
728  local_path, method);
729  if (post && !s->post_data) {
730  send_expect_100 = s->send_expect_100;
731  /* The user has supplied authentication but we don't know the auth type,
732  * send Expect: 100-continue to get the 401 response including the
733  * WWW-Authenticate header, or an 100 continue if no auth actually
734  * is needed. */
735  if (auth && *auth &&
737  s->http_code != 401)
738  send_expect_100 = 1;
739  }
740 
741  /* set default headers if needed */
742  if (!has_header(s->headers, "\r\nUser-Agent: "))
743  len += av_strlcatf(headers + len, sizeof(headers) - len,
744  "User-Agent: %s\r\n", s->user_agent);
745  if (!has_header(s->headers, "\r\nAccept: "))
746  len += av_strlcpy(headers + len, "Accept: */*\r\n",
747  sizeof(headers) - len);
748  // Note: we send this on purpose even when s->off is 0 when we're probing,
749  // since it allows us to detect more reliably if a (non-conforming)
750  // server supports seeking by analysing the reply headers.
751  if (!has_header(s->headers, "\r\nRange: ") && !post && (s->off > 0 || s->end_off || s->seekable == -1)) {
752  len += av_strlcatf(headers + len, sizeof(headers) - len,
753  "Range: bytes=%"PRId64"-", s->off);
754  if (s->end_off)
755  len += av_strlcatf(headers + len, sizeof(headers) - len,
756  "%"PRId64, s->end_off - 1);
757  len += av_strlcpy(headers + len, "\r\n",
758  sizeof(headers) - len);
759  }
760  if (send_expect_100 && !has_header(s->headers, "\r\nExpect: "))
761  len += av_strlcatf(headers + len, sizeof(headers) - len,
762  "Expect: 100-continue\r\n");
763 
764  if (!has_header(s->headers, "\r\nConnection: ")) {
765  if (s->multiple_requests)
766  len += av_strlcpy(headers + len, "Connection: keep-alive\r\n",
767  sizeof(headers) - len);
768  else
769  len += av_strlcpy(headers + len, "Connection: close\r\n",
770  sizeof(headers) - len);
771  }
772 
773  if (!has_header(s->headers, "\r\nHost: "))
774  len += av_strlcatf(headers + len, sizeof(headers) - len,
775  "Host: %s\r\n", hoststr);
776  if (!has_header(s->headers, "\r\nContent-Length: ") && s->post_data)
777  len += av_strlcatf(headers + len, sizeof(headers) - len,
778  "Content-Length: %d\r\n", s->post_datalen);
779 
780  if (!has_header(s->headers, "\r\nContent-Type: ") && s->content_type)
781  len += av_strlcatf(headers + len, sizeof(headers) - len,
782  "Content-Type: %s\r\n", s->content_type);
783  if (!has_header(s->headers, "\r\nCookie: ") && s->cookies) {
784  char *cookies = NULL;
785  if (!get_cookies(s, &cookies, path, hoststr) && cookies) {
786  len += av_strlcatf(headers + len, sizeof(headers) - len,
787  "Cookie: %s\r\n", cookies);
788  av_free(cookies);
789  }
790  }
791  if (!has_header(s->headers, "\r\nIcy-MetaData: ") && s->icy)
792  len += av_strlcatf(headers + len, sizeof(headers) - len,
793  "Icy-MetaData: %d\r\n", 1);
794 
795  /* now add in custom headers */
796  if (s->headers)
797  av_strlcpy(headers + len, s->headers, sizeof(headers) - len);
798 
799  snprintf(s->buffer, sizeof(s->buffer),
800  "%s %s HTTP/1.1\r\n"
801  "%s"
802  "%s"
803  "%s"
804  "%s%s"
805  "\r\n",
806  method,
807  path,
808  post && s->chunked_post ? "Transfer-Encoding: chunked\r\n" : "",
809  headers,
810  authstr ? authstr : "",
811  proxyauthstr ? "Proxy-" : "", proxyauthstr ? proxyauthstr : "");
812 
813  av_log(h, AV_LOG_DEBUG, "request: %s\n", s->buffer);
814 
815  if ((err = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0)
816  goto done;
817 
818  if (s->post_data)
819  if ((err = ffurl_write(s->hd, s->post_data, s->post_datalen)) < 0)
820  goto done;
821 
822  /* init input buffer */
823  s->buf_ptr = s->buffer;
824  s->buf_end = s->buffer;
825  s->line_count = 0;
826  s->off = 0;
827  s->icy_data_read = 0;
828  s->filesize = -1;
829  s->willclose = 0;
830  s->end_chunked_post = 0;
831  s->end_header = 0;
832  if (post && !s->post_data && !send_expect_100) {
833  /* Pretend that it did work. We didn't read any header yet, since
834  * we've still to send the POST data, but the code calling this
835  * function will check http_code after we return. */
836  s->http_code = 200;
837  err = 0;
838  goto done;
839  }
840 
841  /* wait for header */
842  err = http_read_header(h, new_location);
843  if (err < 0)
844  goto done;
845 
846  err = (off == s->off) ? 0 : -1;
847 done:
848  av_freep(&authstr);
849  av_freep(&proxyauthstr);
850  return err;
851 }
852 
853 static int http_buf_read(URLContext *h, uint8_t *buf, int size)
854 {
855  HTTPContext *s = h->priv_data;
856  int len;
857  /* read bytes from input buffer first */
858  len = s->buf_end - s->buf_ptr;
859  if (len > 0) {
860  if (len > size)
861  len = size;
862  memcpy(buf, s->buf_ptr, len);
863  s->buf_ptr += len;
864  } else {
865  if ((!s->willclose || s->chunksize < 0) &&
866  s->filesize >= 0 && s->off >= s->filesize)
867  return AVERROR_EOF;
868  len = ffurl_read(s->hd, buf, size);
869  }
870  if (len > 0) {
871  s->off += len;
872  if (s->chunksize > 0)
873  s->chunksize -= len;
874  }
875  return len;
876 }
877 
878 #if CONFIG_ZLIB
879 #define DECOMPRESS_BUF_SIZE (256 * 1024)
880 static int http_buf_read_compressed(URLContext *h, uint8_t *buf, int size)
881 {
882  HTTPContext *s = h->priv_data;
883  int ret;
884 
885  if (!s->inflate_buffer) {
886  s->inflate_buffer = av_malloc(DECOMPRESS_BUF_SIZE);
887  if (!s->inflate_buffer)
888  return AVERROR(ENOMEM);
889  }
890 
891  if (s->inflate_stream.avail_in == 0) {
892  int read = http_buf_read(h, s->inflate_buffer, DECOMPRESS_BUF_SIZE);
893  if (read <= 0)
894  return read;
895  s->inflate_stream.next_in = s->inflate_buffer;
896  s->inflate_stream.avail_in = read;
897  }
898 
899  s->inflate_stream.avail_out = size;
900  s->inflate_stream.next_out = buf;
901 
902  ret = inflate(&s->inflate_stream, Z_SYNC_FLUSH);
903  if (ret != Z_OK && ret != Z_STREAM_END)
904  av_log(h, AV_LOG_WARNING, "inflate return value: %d, %s\n",
905  ret, s->inflate_stream.msg);
906 
907  return size - s->inflate_stream.avail_out;
908 }
909 #endif /* CONFIG_ZLIB */
910 
911 static int http_read_stream(URLContext *h, uint8_t *buf, int size)
912 {
913  HTTPContext *s = h->priv_data;
914  int err, new_location;
915 
916  if (!s->hd)
917  return AVERROR_EOF;
918 
919  if (s->end_chunked_post && !s->end_header) {
920  err = http_read_header(h, &new_location);
921  if (err < 0)
922  return err;
923  }
924 
925  if (s->chunksize >= 0) {
926  if (!s->chunksize) {
927  char line[32];
928 
929  do {
930  if ((err = http_get_line(s, line, sizeof(line))) < 0)
931  return err;
932  } while (!*line); /* skip CR LF from last chunk */
933 
934  s->chunksize = strtoll(line, NULL, 16);
935 
936  av_dlog(NULL, "Chunked encoding data size: %"PRId64"'\n",
937  s->chunksize);
938 
939  if (!s->chunksize)
940  return 0;
941  }
942  size = FFMIN(size, s->chunksize);
943  }
944 #if CONFIG_ZLIB
945  if (s->compressed)
946  return http_buf_read_compressed(h, buf, size);
947 #endif /* CONFIG_ZLIB */
948  return http_buf_read(h, buf, size);
949 }
950 
951 // Like http_read_stream(), but no short reads.
952 // Assumes partial reads are an error.
953 static int http_read_stream_all(URLContext *h, uint8_t *buf, int size)
954 {
955  int pos = 0;
956  while (pos < size) {
957  int len = http_read_stream(h, buf + pos, size - pos);
958  if (len < 0)
959  return len;
960  pos += len;
961  }
962  return pos;
963 }
964 
965 static void update_metadata(HTTPContext *s, char *data)
966 {
967  char *key;
968  char *val;
969  char *end;
970  char *next = data;
971 
972  while (*next) {
973  key = next;
974  val = strstr(key, "='");
975  if (!val)
976  break;
977  end = strstr(val, "';");
978  if (!end)
979  break;
980 
981  *val = '\0';
982  *end = '\0';
983  val += 2;
984 
985  av_dict_set(&s->metadata, key, val, 0);
986 
987  next = end + 2;
988  }
989 }
990 
991 static int store_icy(URLContext *h, int size)
992 {
993  HTTPContext *s = h->priv_data;
994  /* until next metadata packet */
995  int remaining = s->icy_metaint - s->icy_data_read;
996 
997  if (remaining < 0)
998  return AVERROR_INVALIDDATA;
999 
1000  if (!remaining) {
1001  /* The metadata packet is variable sized. It has a 1 byte header
1002  * which sets the length of the packet (divided by 16). If it's 0,
1003  * the metadata doesn't change. After the packet, icy_metaint bytes
1004  * of normal data follows. */
1005  uint8_t ch;
1006  int len = http_read_stream_all(h, &ch, 1);
1007  if (len < 0)
1008  return len;
1009  if (ch > 0) {
1010  char data[255 * 16 + 1];
1011  int ret;
1012  len = ch * 16;
1013  ret = http_read_stream_all(h, data, len);
1014  if (ret < 0)
1015  return ret;
1016  data[len + 1] = 0;
1017  if ((ret = av_opt_set(s, "icy_metadata_packet", data, 0)) < 0)
1018  return ret;
1019  update_metadata(s, data);
1020  }
1021  s->icy_data_read = 0;
1022  remaining = s->icy_metaint;
1023  }
1024 
1025  return FFMIN(size, remaining);
1026 }
1027 
1028 static int http_read(URLContext *h, uint8_t *buf, int size)
1029 {
1030  HTTPContext *s = h->priv_data;
1031 
1032  if (s->icy_metaint > 0) {
1033  size = store_icy(h, size);
1034  if (size < 0)
1035  return size;
1036  }
1037 
1038  size = http_read_stream(h, buf, size);
1039  if (size > 0)
1040  s->icy_data_read += size;
1041  return size;
1042 }
1043 
1044 /* used only when posting data */
1045 static int http_write(URLContext *h, const uint8_t *buf, int size)
1046 {
1047  char temp[11] = ""; /* 32-bit hex + CRLF + nul */
1048  int ret;
1049  char crlf[] = "\r\n";
1050  HTTPContext *s = h->priv_data;
1051 
1052  if (!s->chunked_post) {
1053  /* non-chunked data is sent without any special encoding */
1054  return ffurl_write(s->hd, buf, size);
1055  }
1056 
1057  /* silently ignore zero-size data since chunk encoding that would
1058  * signal EOF */
1059  if (size > 0) {
1060  /* upload data using chunked encoding */
1061  snprintf(temp, sizeof(temp), "%x\r\n", size);
1062 
1063  if ((ret = ffurl_write(s->hd, temp, strlen(temp))) < 0 ||
1064  (ret = ffurl_write(s->hd, buf, size)) < 0 ||
1065  (ret = ffurl_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
1066  return ret;
1067  }
1068  return size;
1069 }
1070 
1071 static int http_shutdown(URLContext *h, int flags)
1072 {
1073  int ret = 0;
1074  char footer[] = "0\r\n\r\n";
1075  HTTPContext *s = h->priv_data;
1076 
1077  /* signal end of chunked encoding if used */
1078  if ((flags & AVIO_FLAG_WRITE) && s->chunked_post) {
1079  ret = ffurl_write(s->hd, footer, sizeof(footer) - 1);
1080  ret = ret > 0 ? 0 : ret;
1081  s->end_chunked_post = 1;
1082  }
1083 
1084  return ret;
1085 }
1086 
1087 static int http_close(URLContext *h)
1088 {
1089  int ret = 0;
1090  HTTPContext *s = h->priv_data;
1091 
1092 #if CONFIG_ZLIB
1093  inflateEnd(&s->inflate_stream);
1094  av_freep(&s->inflate_buffer);
1095 #endif /* CONFIG_ZLIB */
1096 
1097  if (!s->end_chunked_post)
1098  /* Close the write direction by sending the end of chunked encoding. */
1099  ret = http_shutdown(h, h->flags);
1100 
1101  if (s->hd)
1102  ffurl_closep(&s->hd);
1104  return ret;
1105 }
1106 
1107 static int64_t http_seek(URLContext *h, int64_t off, int whence)
1108 {
1109  HTTPContext *s = h->priv_data;
1110  URLContext *old_hd = s->hd;
1111  int64_t old_off = s->off;
1112  uint8_t old_buf[BUFFER_SIZE];
1113  int old_buf_size, ret;
1114  AVDictionary *options = NULL;
1115 
1116  if (whence == AVSEEK_SIZE)
1117  return s->filesize;
1118  else if ((whence == SEEK_CUR && off == 0) ||
1119  (whence == SEEK_SET && off == s->off))
1120  return s->off;
1121  else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
1122  return AVERROR(ENOSYS);
1123 
1124  if (whence == SEEK_CUR)
1125  off += s->off;
1126  else if (whence == SEEK_END)
1127  off += s->filesize;
1128  else if (whence != SEEK_SET)
1129  return AVERROR(EINVAL);
1130  if (off < 0)
1131  return AVERROR(EINVAL);
1132  s->off = off;
1133 
1134  /* we save the old context in case the seek fails */
1135  old_buf_size = s->buf_end - s->buf_ptr;
1136  memcpy(old_buf, s->buf_ptr, old_buf_size);
1137  s->hd = NULL;
1138 
1139  /* if it fails, continue on old connection */
1140  if ((ret = http_open_cnx(h, &options)) < 0) {
1141  av_dict_free(&options);
1142  memcpy(s->buffer, old_buf, old_buf_size);
1143  s->buf_ptr = s->buffer;
1144  s->buf_end = s->buffer + old_buf_size;
1145  s->hd = old_hd;
1146  s->off = old_off;
1147  return ret;
1148  }
1149  av_dict_free(&options);
1150  ffurl_close(old_hd);
1151  return off;
1152 }
1153 
1155 {
1156  HTTPContext *s = h->priv_data;
1157  return ffurl_get_file_handle(s->hd);
1158 }
1159 
1160 #define HTTP_CLASS(flavor) \
1161 static const AVClass flavor ## _context_class = { \
1162  .class_name = # flavor, \
1163  .item_name = av_default_item_name, \
1164  .option = options, \
1165  .version = LIBAVUTIL_VERSION_INT, \
1166 }
1167 
1168 #if CONFIG_HTTP_PROTOCOL
1169 HTTP_CLASS(http);
1170 
1171 URLProtocol ff_http_protocol = {
1172  .name = "http",
1173  .url_open2 = http_open,
1174  .url_read = http_read,
1175  .url_write = http_write,
1176  .url_seek = http_seek,
1177  .url_close = http_close,
1178  .url_get_file_handle = http_get_file_handle,
1179  .url_shutdown = http_shutdown,
1180  .priv_data_size = sizeof(HTTPContext),
1181  .priv_data_class = &http_context_class,
1183 };
1184 #endif /* CONFIG_HTTP_PROTOCOL */
1185 
1186 #if CONFIG_HTTPS_PROTOCOL
1187 HTTP_CLASS(https);
1188 
1189 URLProtocol ff_https_protocol = {
1190  .name = "https",
1191  .url_open2 = http_open,
1192  .url_read = http_read,
1193  .url_write = http_write,
1194  .url_seek = http_seek,
1195  .url_close = http_close,
1196  .url_get_file_handle = http_get_file_handle,
1197  .url_shutdown = http_shutdown,
1198  .priv_data_size = sizeof(HTTPContext),
1199  .priv_data_class = &https_context_class,
1201 };
1202 #endif /* CONFIG_HTTPS_PROTOCOL */
1203 
1204 #if CONFIG_HTTPPROXY_PROTOCOL
1205 static int http_proxy_close(URLContext *h)
1206 {
1207  HTTPContext *s = h->priv_data;
1208  if (s->hd)
1209  ffurl_closep(&s->hd);
1210  return 0;
1211 }
1212 
1213 static int http_proxy_open(URLContext *h, const char *uri, int flags)
1214 {
1215  HTTPContext *s = h->priv_data;
1216  char hostname[1024], hoststr[1024];
1217  char auth[1024], pathbuf[1024], *path;
1218  char lower_url[100];
1219  int port, ret = 0, attempts = 0;
1220  HTTPAuthType cur_auth_type;
1221  char *authstr;
1222  int new_loc;
1223 
1224  if( s->seekable == 1 )
1225  h->is_streamed = 0;
1226  else
1227  h->is_streamed = 1;
1228 
1229  av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
1230  pathbuf, sizeof(pathbuf), uri);
1231  ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
1232  path = pathbuf;
1233  if (*path == '/')
1234  path++;
1235 
1236  ff_url_join(lower_url, sizeof(lower_url), "tcp", NULL, hostname, port,
1237  NULL);
1238 redo:
1239  ret = ffurl_open(&s->hd, lower_url, AVIO_FLAG_READ_WRITE,
1240  &h->interrupt_callback, NULL);
1241  if (ret < 0)
1242  return ret;
1243 
1244  authstr = ff_http_auth_create_response(&s->proxy_auth_state, auth,
1245  path, "CONNECT");
1246  snprintf(s->buffer, sizeof(s->buffer),
1247  "CONNECT %s HTTP/1.1\r\n"
1248  "Host: %s\r\n"
1249  "Connection: close\r\n"
1250  "%s%s"
1251  "\r\n",
1252  path,
1253  hoststr,
1254  authstr ? "Proxy-" : "", authstr ? authstr : "");
1255  av_freep(&authstr);
1256 
1257  if ((ret = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0)
1258  goto fail;
1259 
1260  s->buf_ptr = s->buffer;
1261  s->buf_end = s->buffer;
1262  s->line_count = 0;
1263  s->filesize = -1;
1264  cur_auth_type = s->proxy_auth_state.auth_type;
1265 
1266  /* Note: This uses buffering, potentially reading more than the
1267  * HTTP header. If tunneling a protocol where the server starts
1268  * the conversation, we might buffer part of that here, too.
1269  * Reading that requires using the proper ffurl_read() function
1270  * on this URLContext, not using the fd directly (as the tls
1271  * protocol does). This shouldn't be an issue for tls though,
1272  * since the client starts the conversation there, so there
1273  * is no extra data that we might buffer up here.
1274  */
1275  ret = http_read_header(h, &new_loc);
1276  if (ret < 0)
1277  goto fail;
1278 
1279  attempts++;
1280  if (s->http_code == 407 &&
1281  (cur_auth_type == HTTP_AUTH_NONE || s->proxy_auth_state.stale) &&
1282  s->proxy_auth_state.auth_type != HTTP_AUTH_NONE && attempts < 2) {
1283  ffurl_closep(&s->hd);
1284  goto redo;
1285  }
1286 
1287  if (s->http_code < 400)
1288  return 0;
1289  ret = ff_http_averror(s->http_code, AVERROR(EIO));
1290 
1291 fail:
1292  http_proxy_close(h);
1293  return ret;
1294 }
1295 
1296 static int http_proxy_write(URLContext *h, const uint8_t *buf, int size)
1297 {
1298  HTTPContext *s = h->priv_data;
1299  return ffurl_write(s->hd, buf, size);
1300 }
1301 
1302 URLProtocol ff_httpproxy_protocol = {
1303  .name = "httpproxy",
1304  .url_open = http_proxy_open,
1305  .url_read = http_buf_read,
1306  .url_write = http_proxy_write,
1307  .url_close = http_proxy_close,
1308  .url_get_file_handle = http_get_file_handle,
1309  .priv_data_size = sizeof(HTTPContext),
1310  .flags = URL_PROTOCOL_FLAG_NETWORK,
1311 };
1312 #endif /* CONFIG_HTTPPROXY_PROTOCOL */