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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 "libavutil/avstring.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "network.h"
26 #include "http.h"
27 #include "os_support.h"
28 #include "httpauth.h"
29 #include "url.h"
30 #include "libavutil/opt.h"
31 
32 #if CONFIG_ZLIB
33 #include <zlib.h>
34 #endif
35 
36 /* XXX: POST protocol is not completely implemented because ffmpeg uses
37  only a subset of it. */
38 
39 /* The IO buffer size is unrelated to the max URL size in itself, but needs
40  * to be large enough to fit the full request headers (including long
41  * path names).
42  */
43 #define BUFFER_SIZE MAX_URL_SIZE
44 #define MAX_REDIRECTS 8
45 
46 typedef struct {
47  const AVClass *class;
49  unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
51  int http_code;
52  /* Used if "Transfer-Encoding: chunked" otherwise -1. */
53  int64_t chunksize;
54  int64_t off, end_off, filesize;
55  char *location;
58  char *headers;
59  char *mime_type;
60  char *user_agent;
61  char *content_type;
62  /* Set if the server correctly handles Connection: close and will close
63  * the connection after feeding us the content. */
64  int willclose;
65  int seekable; /**< Control seekability, 0 = disable, 1 = enable, -1 = probe. */
67  /* A flag which indicates if the end of chunked encoding has been sent. */
69  /* A flag which indicates we have finished to read POST reply. */
71  /* A flag which indicates if we use persistent connections. */
75  int is_akamai;
77  char *cookies; ///< holds newline (\n) delimited Set-Cookie header field values (without the "Set-Cookie: " field name)
78  int icy;
79  /* how much data was read since the last ICY metadata packet */
81  /* after how many bytes of read data a new metadata packet will be found */
85 #if CONFIG_ZLIB
86  int compressed;
87  z_stream inflate_stream;
88  uint8_t *inflate_buffer;
89 #endif
92 } HTTPContext;
93 
94 #define OFFSET(x) offsetof(HTTPContext, x)
95 #define D AV_OPT_FLAG_DECODING_PARAM
96 #define E AV_OPT_FLAG_ENCODING_PARAM
97 #define DEFAULT_USER_AGENT "Lavf/" AV_STRINGIFY(LIBAVFORMAT_VERSION)
98 static const AVOption options[] = {
99 {"seekable", "control seekability of connection", OFFSET(seekable), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, D },
100 {"chunked_post", "use chunked transfer-encoding for posts", OFFSET(chunked_post), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
101 {"headers", "set custom HTTP headers, can override built in default headers", OFFSET(headers), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
102 {"content_type", "set a specific content type for the POST messages", OFFSET(content_type), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
103 {"user_agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = DEFAULT_USER_AGENT}, 0, 0, D },
104 {"user-agent", "override User-Agent header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = DEFAULT_USER_AGENT}, 0, 0, D },
105 {"multiple_requests", "use persistent connections", OFFSET(multiple_requests), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
106 {"post_data", "set custom HTTP post data", OFFSET(post_data), AV_OPT_TYPE_BINARY, .flags = D|E },
107 {"mime_type", "export the MIME type", OFFSET(mime_type), AV_OPT_TYPE_STRING, {0}, 0, 0, AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
108 {"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 },
109 {"icy", "request ICY metadata", OFFSET(icy), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
110 {"icy_metadata_headers", "return ICY metadata headers", OFFSET(icy_metadata_headers), AV_OPT_TYPE_STRING, {0}, 0, 0, AV_OPT_FLAG_EXPORT },
111 {"icy_metadata_packet", "return current ICY metadata packet", OFFSET(icy_metadata_packet), AV_OPT_TYPE_STRING, {0}, 0, 0, AV_OPT_FLAG_EXPORT },
112 {"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" },
113 {"none", "No auth method set, autodetect", 0, AV_OPT_TYPE_CONST, {.i64 = HTTP_AUTH_NONE}, 0, 0, D|E, "auth_type" },
114 {"basic", "HTTP basic authentication", 0, AV_OPT_TYPE_CONST, {.i64 = HTTP_AUTH_BASIC}, 0, 0, D|E, "auth_type" },
115 {"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 },
116 {"location", "The actual location of the data received", OFFSET(location), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
117 {"offset", "initial byte offset", OFFSET(off), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, D },
118 {"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 },
119 {NULL}
120 };
121 #define HTTP_CLASS(flavor)\
122 static const AVClass flavor ## _context_class = {\
123  .class_name = #flavor,\
124  .item_name = av_default_item_name,\
125  .option = options,\
126  .version = LIBAVUTIL_VERSION_INT,\
127 }
128 
129 HTTP_CLASS(http);
130 HTTP_CLASS(https);
131 
132 static int http_connect(URLContext *h, const char *path, const char *local_path,
133  const char *hoststr, const char *auth,
134  const char *proxyauth, int *new_location);
135 
137 {
138  memcpy(&((HTTPContext*)dest->priv_data)->auth_state,
139  &((HTTPContext*)src->priv_data)->auth_state, sizeof(HTTPAuthState));
140  memcpy(&((HTTPContext*)dest->priv_data)->proxy_auth_state,
141  &((HTTPContext*)src->priv_data)->proxy_auth_state,
142  sizeof(HTTPAuthState));
143 }
144 
145 /* return non zero if error */
146 static int http_open_cnx(URLContext *h, AVDictionary **options)
147 {
148  const char *path, *proxy_path, *lower_proto = "tcp", *local_path;
149  char hostname[1024], hoststr[1024], proto[10];
150  char auth[1024], proxyauth[1024] = "";
151  char path1[MAX_URL_SIZE];
152  char buf[1024], urlbuf[MAX_URL_SIZE];
153  int port, use_proxy, err, location_changed = 0, redirects = 0, attempts = 0;
154  HTTPAuthType cur_auth_type, cur_proxy_auth_type;
155  HTTPContext *s = h->priv_data;
156 
157  /* fill the dest addr */
158  redo:
159  /* needed in any case to build the host string */
160  av_url_split(proto, sizeof(proto), auth, sizeof(auth),
161  hostname, sizeof(hostname), &port,
162  path1, sizeof(path1), s->location);
163  ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
164 
165  proxy_path = getenv("http_proxy");
166  use_proxy = !ff_http_match_no_proxy(getenv("no_proxy"), hostname) &&
167  proxy_path != NULL && av_strstart(proxy_path, "http://", NULL);
168 
169  if (!strcmp(proto, "https")) {
170  lower_proto = "tls";
171  use_proxy = 0;
172  if (port < 0)
173  port = 443;
174  }
175  if (port < 0)
176  port = 80;
177 
178  if (path1[0] == '\0')
179  path = "/";
180  else
181  path = path1;
182  local_path = path;
183  if (use_proxy) {
184  /* Reassemble the request URL without auth string - we don't
185  * want to leak the auth to the proxy. */
186  ff_url_join(urlbuf, sizeof(urlbuf), proto, NULL, hostname, port, "%s",
187  path1);
188  path = urlbuf;
189  av_url_split(NULL, 0, proxyauth, sizeof(proxyauth),
190  hostname, sizeof(hostname), &port, NULL, 0, proxy_path);
191  }
192 
193  ff_url_join(buf, sizeof(buf), lower_proto, NULL, hostname, port, NULL);
194 
195  if (!s->hd) {
196  err = ffurl_open(&s->hd, buf, AVIO_FLAG_READ_WRITE,
197  &h->interrupt_callback, options);
198  if (err < 0)
199  goto fail;
200  }
201 
202  cur_auth_type = s->auth_state.auth_type;
203  cur_proxy_auth_type = s->auth_state.auth_type;
204  if (http_connect(h, path, local_path, hoststr, auth, proxyauth, &location_changed) < 0)
205  goto fail;
206  attempts++;
207  if (s->http_code == 401) {
208  if ((cur_auth_type == HTTP_AUTH_NONE || s->auth_state.stale) &&
209  s->auth_state.auth_type != HTTP_AUTH_NONE && attempts < 4) {
210  ffurl_closep(&s->hd);
211  goto redo;
212  } else
213  goto fail;
214  }
215  if (s->http_code == 407) {
216  if ((cur_proxy_auth_type == HTTP_AUTH_NONE || s->proxy_auth_state.stale) &&
217  s->proxy_auth_state.auth_type != HTTP_AUTH_NONE && attempts < 4) {
218  ffurl_closep(&s->hd);
219  goto redo;
220  } else
221  goto fail;
222  }
223  if ((s->http_code == 301 || s->http_code == 302 || s->http_code == 303 || s->http_code == 307)
224  && location_changed == 1) {
225  /* url moved, get next */
226  ffurl_closep(&s->hd);
227  if (redirects++ >= MAX_REDIRECTS)
228  return AVERROR(EIO);
229  /* Restart the authentication process with the new target, which
230  * might use a different auth mechanism. */
231  memset(&s->auth_state, 0, sizeof(s->auth_state));
232  attempts = 0;
233  location_changed = 0;
234  goto redo;
235  }
236  return 0;
237  fail:
238  if (s->hd)
239  ffurl_closep(&s->hd);
240  return AVERROR(EIO);
241 }
242 
243 int ff_http_do_new_request(URLContext *h, const char *uri)
244 {
245  HTTPContext *s = h->priv_data;
246  AVDictionary *options = NULL;
247  int ret;
248 
249  s->off = 0;
250  s->icy_data_read = 0;
251  av_free(s->location);
252  s->location = av_strdup(uri);
253  if (!s->location)
254  return AVERROR(ENOMEM);
255 
256  av_dict_copy(&options, s->chained_options, 0);
257  ret = http_open_cnx(h, &options);
258  av_dict_free(&options);
259  return ret;
260 }
261 
262 static int http_open(URLContext *h, const char *uri, int flags,
263  AVDictionary **options)
264 {
265  HTTPContext *s = h->priv_data;
266  int ret;
267 
268  if( s->seekable == 1 )
269  h->is_streamed = 0;
270  else
271  h->is_streamed = 1;
272 
273  s->filesize = -1;
274  s->location = av_strdup(uri);
275  if (!s->location)
276  return AVERROR(ENOMEM);
277  if (options)
278  av_dict_copy(&s->chained_options, *options, 0);
279 
280  if (s->headers) {
281  int len = strlen(s->headers);
282  if (len < 2 || strcmp("\r\n", s->headers + len - 2))
283  av_log(h, AV_LOG_WARNING, "No trailing CRLF found in HTTP header.\n");
284  }
285 
286  ret = http_open_cnx(h, options);
287  if (ret < 0)
289  return ret;
290 }
291 static int http_getc(HTTPContext *s)
292 {
293  int len;
294  if (s->buf_ptr >= s->buf_end) {
295  len = ffurl_read(s->hd, s->buffer, BUFFER_SIZE);
296  if (len < 0) {
297  return len;
298  } else if (len == 0) {
299  return AVERROR_EOF;
300  } else {
301  s->buf_ptr = s->buffer;
302  s->buf_end = s->buffer + len;
303  }
304  }
305  return *s->buf_ptr++;
306 }
307 
308 static int http_get_line(HTTPContext *s, char *line, int line_size)
309 {
310  int ch;
311  char *q;
312 
313  q = line;
314  for(;;) {
315  ch = http_getc(s);
316  if (ch < 0)
317  return ch;
318  if (ch == '\n') {
319  /* process line */
320  if (q > line && q[-1] == '\r')
321  q--;
322  *q = '\0';
323 
324  return 0;
325  } else {
326  if ((q - line) < line_size - 1)
327  *q++ = ch;
328  }
329  }
330 }
331 
332 static int check_http_code(URLContext *h, int http_code, const char *end)
333 {
334  HTTPContext *s = h->priv_data;
335  /* error codes are 4xx and 5xx, but regard 401 as a success, so we
336  * don't abort until all headers have been parsed. */
337  if (http_code >= 400 && http_code < 600 &&
338  (http_code != 401 || s->auth_state.auth_type != HTTP_AUTH_NONE) &&
339  (http_code != 407 || s->proxy_auth_state.auth_type != HTTP_AUTH_NONE)) {
340  end += strspn(end, SPACE_CHARS);
341  av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n", http_code, end);
342  return AVERROR(EIO);
343  }
344  return 0;
345 }
346 
347 static int parse_location(HTTPContext *s, const char *p)
348 {
349  char redirected_location[MAX_URL_SIZE], *new_loc;
350  ff_make_absolute_url(redirected_location, sizeof(redirected_location),
351  s->location, p);
352  new_loc = av_strdup(redirected_location);
353  if (!new_loc)
354  return AVERROR(ENOMEM);
355  av_free(s->location);
356  s->location = new_loc;
357  return 0;
358 }
359 
360 /* "bytes $from-$to/$document_size" */
361 static void parse_content_range(URLContext *h, const char *p)
362 {
363  HTTPContext *s = h->priv_data;
364  const char *slash;
365 
366  if (!strncmp(p, "bytes ", 6)) {
367  p += 6;
368  s->off = strtoll(p, NULL, 10);
369  if ((slash = strchr(p, '/')) && strlen(slash) > 0)
370  s->filesize = strtoll(slash+1, NULL, 10);
371  }
372  if (s->seekable == -1 && (!s->is_akamai || s->filesize != 2147483647))
373  h->is_streamed = 0; /* we _can_ in fact seek */
374 }
375 
376 static int parse_content_encoding(URLContext *h, const char *p)
377 {
378  HTTPContext *s = h->priv_data;
379 
380  if (!av_strncasecmp(p, "gzip", 4) ||
381  !av_strncasecmp(p, "deflate", 7)) {
382 #if CONFIG_ZLIB
383  s->compressed = 1;
384  inflateEnd(&s->inflate_stream);
385  if (inflateInit2(&s->inflate_stream, 32 + 15) != Z_OK) {
386  av_log(h, AV_LOG_WARNING, "Error during zlib initialisation: %s\n",
387  s->inflate_stream.msg);
388  return AVERROR(ENOSYS);
389  }
390  if (zlibCompileFlags() & (1 << 17)) {
392  "Your zlib was compiled without gzip support.\n");
393  return AVERROR(ENOSYS);
394  }
395 #else
397  "Compressed (%s) content, need zlib with gzip support\n", p);
398  return AVERROR(ENOSYS);
399 #endif
400  } else if (!av_strncasecmp(p, "identity", 8)) {
401  // The normal, no-encoding case (although servers shouldn't include
402  // the header at all if this is the case).
403  } else {
404  av_log(h, AV_LOG_WARNING, "Unknown content coding: %s\n", p);
405  }
406  return 0;
407 }
408 
409 // Concat all Icy- header lines
410 static int parse_icy(HTTPContext *s, const char *tag, const char *p)
411 {
412  int len = 4 + strlen(p) + strlen(tag);
413  int is_first = !s->icy_metadata_headers;
414  int ret;
415 
416  if (s->icy_metadata_headers)
417  len += strlen(s->icy_metadata_headers);
418 
419  if ((ret = av_reallocp(&s->icy_metadata_headers, len)) < 0)
420  return ret;
421 
422  if (is_first)
423  *s->icy_metadata_headers = '\0';
424 
425  av_strlcatf(s->icy_metadata_headers, len, "%s: %s\n", tag, p);
426 
427  return 0;
428 }
429 
430 static int process_line(URLContext *h, char *line, int line_count,
431  int *new_location)
432 {
433  HTTPContext *s = h->priv_data;
434  char *tag, *p, *end;
435  int ret;
436 
437  /* end of header */
438  if (line[0] == '\0') {
439  s->end_header = 1;
440  return 0;
441  }
442 
443  p = line;
444  if (line_count == 0) {
445  while (!av_isspace(*p) && *p != '\0')
446  p++;
447  while (av_isspace(*p))
448  p++;
449  s->http_code = strtol(p, &end, 10);
450 
451  av_log(h, AV_LOG_DEBUG, "http_code=%d\n", s->http_code);
452 
453  if ((ret = check_http_code(h, s->http_code, end)) < 0)
454  return ret;
455  } else {
456  while (*p != '\0' && *p != ':')
457  p++;
458  if (*p != ':')
459  return 1;
460 
461  *p = '\0';
462  tag = line;
463  p++;
464  while (av_isspace(*p))
465  p++;
466  if (!av_strcasecmp(tag, "Location")) {
467  if ((ret = parse_location(s, p)) < 0)
468  return ret;
469  *new_location = 1;
470  } else if (!av_strcasecmp(tag, "Content-Length") && s->filesize == -1) {
471  s->filesize = strtoll(p, NULL, 10);
472  } else if (!av_strcasecmp(tag, "Content-Range")) {
473  parse_content_range(h, p);
474  } else if (!av_strcasecmp(tag, "Accept-Ranges") &&
475  !strncmp(p, "bytes", 5) &&
476  s->seekable == -1) {
477  h->is_streamed = 0;
478  } else if (!av_strcasecmp(tag, "Transfer-Encoding") &&
479  !av_strncasecmp(p, "chunked", 7)) {
480  s->filesize = -1;
481  s->chunksize = 0;
482  } else if (!av_strcasecmp(tag, "WWW-Authenticate")) {
484  } else if (!av_strcasecmp(tag, "Authentication-Info")) {
486  } else if (!av_strcasecmp(tag, "Proxy-Authenticate")) {
488  } else if (!av_strcasecmp(tag, "Connection")) {
489  if (!strcmp(p, "close"))
490  s->willclose = 1;
491  } else if (!av_strcasecmp (tag, "Server")) {
492  if (!av_strcasecmp (p, "AkamaiGHost")) {
493  s->is_akamai = 1;
494  } else if (!av_strncasecmp (p, "MediaGateway", 12)) {
495  s->is_mediagateway = 1;
496  }
497  } else if (!av_strcasecmp (tag, "Content-Type")) {
498  av_free(s->mime_type);
499  s->mime_type = av_strdup(p);
500  } else if (!av_strcasecmp (tag, "Set-Cookie")) {
501  if (!s->cookies) {
502  if (!(s->cookies = av_strdup(p)))
503  return AVERROR(ENOMEM);
504  } else {
505  char *tmp = s->cookies;
506  size_t str_size = strlen(tmp) + strlen(p) + 2;
507  if (!(s->cookies = av_malloc(str_size))) {
508  s->cookies = tmp;
509  return AVERROR(ENOMEM);
510  }
511  snprintf(s->cookies, str_size, "%s\n%s", tmp, p);
512  av_free(tmp);
513  }
514  } else if (!av_strcasecmp (tag, "Icy-MetaInt")) {
515  s->icy_metaint = strtoll(p, NULL, 10);
516  } else if (!av_strncasecmp(tag, "Icy-", 4)) {
517  if ((ret = parse_icy(s, tag, p)) < 0)
518  return ret;
519  } else if (!av_strcasecmp(tag, "Content-Encoding")) {
520  if ((ret = parse_content_encoding(h, p)) < 0)
521  return ret;
522  }
523  }
524  return 1;
525 }
526 
527 /**
528  * Create a string containing cookie values for use as a HTTP cookie header
529  * field value for a particular path and domain from the cookie values stored in
530  * the HTTP protocol context. The cookie string is stored in *cookies.
531  *
532  * @return a negative value if an error condition occurred, 0 otherwise
533  */
534 static int get_cookies(HTTPContext *s, char **cookies, const char *path,
535  const char *domain)
536 {
537  // cookie strings will look like Set-Cookie header field values. Multiple
538  // Set-Cookie fields will result in multiple values delimited by a newline
539  int ret = 0;
540  char *next, *cookie, *set_cookies = av_strdup(s->cookies), *cset_cookies = set_cookies;
541 
542  if (!set_cookies) return AVERROR(EINVAL);
543 
544  *cookies = NULL;
545  while ((cookie = av_strtok(set_cookies, "\n", &next))) {
546  int domain_offset = 0;
547  char *param, *next_param, *cdomain = NULL, *cpath = NULL, *cvalue = NULL;
548  set_cookies = NULL;
549 
550  while ((param = av_strtok(cookie, "; ", &next_param))) {
551  cookie = NULL;
552  if (!av_strncasecmp("path=", param, 5)) {
553  av_free(cpath);
554  cpath = av_strdup(&param[5]);
555  } else if (!av_strncasecmp("domain=", param, 7)) {
556  // if the cookie specifies a sub-domain, skip the leading dot thereby
557  // supporting URLs that point to sub-domains and the master domain
558  int leading_dot = (param[7] == '.');
559  av_free(cdomain);
560  cdomain = av_strdup(&param[7+leading_dot]);
561  } else if (!av_strncasecmp("secure", param, 6) ||
562  !av_strncasecmp("comment", param, 7) ||
563  !av_strncasecmp("max-age", param, 7) ||
564  !av_strncasecmp("version", param, 7)) {
565  // ignore Comment, Max-Age, Secure and Version
566  } else {
567  av_free(cvalue);
568  cvalue = av_strdup(param);
569  }
570  }
571  if (!cdomain)
572  cdomain = av_strdup(domain);
573 
574  // ensure all of the necessary values are valid
575  if (!cdomain || !cpath || !cvalue) {
577  "Invalid cookie found, no value, path or domain specified\n");
578  goto done_cookie;
579  }
580 
581  // check if the request path matches the cookie path
582  if (av_strncasecmp(path, cpath, strlen(cpath)))
583  goto done_cookie;
584 
585  // the domain should be at least the size of our cookie domain
586  domain_offset = strlen(domain) - strlen(cdomain);
587  if (domain_offset < 0)
588  goto done_cookie;
589 
590  // match the cookie domain
591  if (av_strcasecmp(&domain[domain_offset], cdomain))
592  goto done_cookie;
593 
594  // cookie parameters match, so copy the value
595  if (!*cookies) {
596  if (!(*cookies = av_strdup(cvalue))) {
597  ret = AVERROR(ENOMEM);
598  goto done_cookie;
599  }
600  } else {
601  char *tmp = *cookies;
602  size_t str_size = strlen(cvalue) + strlen(*cookies) + 3;
603  if (!(*cookies = av_malloc(str_size))) {
604  ret = AVERROR(ENOMEM);
605  goto done_cookie;
606  }
607  snprintf(*cookies, str_size, "%s; %s", tmp, cvalue);
608  av_free(tmp);
609  }
610 
611  done_cookie:
612  av_free(cdomain);
613  av_free(cpath);
614  av_free(cvalue);
615  if (ret < 0) {
616  if (*cookies) av_freep(cookies);
617  av_free(cset_cookies);
618  return ret;
619  }
620  }
621 
622  av_free(cset_cookies);
623 
624  return 0;
625 }
626 
627 static inline int has_header(const char *str, const char *header)
628 {
629  /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
630  if (!str)
631  return 0;
632  return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
633 }
634 
635 static int http_read_header(URLContext *h, int *new_location)
636 {
637  HTTPContext *s = h->priv_data;
638  char line[MAX_URL_SIZE];
639  int err = 0;
640 
641  s->chunksize = -1;
642 
643  for (;;) {
644  if ((err = http_get_line(s, line, sizeof(line))) < 0)
645  return err;
646 
647  av_log(h, AV_LOG_DEBUG, "header='%s'\n", line);
648 
649  err = process_line(h, line, s->line_count, new_location);
650  if (err < 0)
651  return err;
652  if (err == 0)
653  break;
654  s->line_count++;
655  }
656 
657  if (s->seekable == -1 && s->is_mediagateway && s->filesize == 2000000000)
658  h->is_streamed = 1; /* we can in fact _not_ seek */
659 
660  return err;
661 }
662 
663 static int http_connect(URLContext *h, const char *path, const char *local_path,
664  const char *hoststr, const char *auth,
665  const char *proxyauth, int *new_location)
666 {
667  HTTPContext *s = h->priv_data;
668  int post, err;
669  char headers[4096] = "";
670  char *authstr = NULL, *proxyauthstr = NULL;
671  int64_t off = s->off;
672  int len = 0;
673  const char *method;
674  int send_expect_100 = 0;
675 
676 
677  /* send http header */
678  post = h->flags & AVIO_FLAG_WRITE;
679 
680  if (s->post_data) {
681  /* force POST method and disable chunked encoding when
682  * custom HTTP post data is set */
683  post = 1;
684  s->chunked_post = 0;
685  }
686 
687  method = post ? "POST" : "GET";
688  authstr = ff_http_auth_create_response(&s->auth_state, auth, local_path,
689  method);
690  proxyauthstr = ff_http_auth_create_response(&s->proxy_auth_state, proxyauth,
691  local_path, method);
692  if (post && !s->post_data) {
693  send_expect_100 = s->send_expect_100;
694  /* The user has supplied authentication but we don't know the auth type,
695  * send Expect: 100-continue to get the 401 response including the
696  * WWW-Authenticate header, or an 100 continue if no auth actually
697  * is needed. */
698  if (auth && *auth &&
700  s->http_code != 401)
701  send_expect_100 = 1;
702  }
703 
704  /* set default headers if needed */
705  if (!has_header(s->headers, "\r\nUser-Agent: "))
706  len += av_strlcatf(headers + len, sizeof(headers) - len,
707  "User-Agent: %s\r\n", s->user_agent);
708  if (!has_header(s->headers, "\r\nAccept: "))
709  len += av_strlcpy(headers + len, "Accept: */*\r\n",
710  sizeof(headers) - len);
711  // Note: we send this on purpose even when s->off is 0 when we're probing,
712  // since it allows us to detect more reliably if a (non-conforming)
713  // server supports seeking by analysing the reply headers.
714  if (!has_header(s->headers, "\r\nRange: ") && !post && (s->off > 0 || s->end_off || s->seekable == -1)) {
715  len += av_strlcatf(headers + len, sizeof(headers) - len,
716  "Range: bytes=%"PRId64"-", s->off);
717  if (s->end_off)
718  len += av_strlcatf(headers + len, sizeof(headers) - len,
719  "%"PRId64, s->end_off - 1);
720  len += av_strlcpy(headers + len, "\r\n",
721  sizeof(headers) - len);
722  }
723  if (send_expect_100 && !has_header(s->headers, "\r\nExpect: "))
724  len += av_strlcatf(headers + len, sizeof(headers) - len,
725  "Expect: 100-continue\r\n");
726 
727  if (!has_header(s->headers, "\r\nConnection: ")) {
728  if (s->multiple_requests) {
729  len += av_strlcpy(headers + len, "Connection: keep-alive\r\n",
730  sizeof(headers) - len);
731  } else {
732  len += av_strlcpy(headers + len, "Connection: close\r\n",
733  sizeof(headers) - len);
734  }
735  }
736 
737  if (!has_header(s->headers, "\r\nHost: "))
738  len += av_strlcatf(headers + len, sizeof(headers) - len,
739  "Host: %s\r\n", hoststr);
740  if (!has_header(s->headers, "\r\nContent-Length: ") && s->post_data)
741  len += av_strlcatf(headers + len, sizeof(headers) - len,
742  "Content-Length: %d\r\n", s->post_datalen);
743 
744  if (!has_header(s->headers, "\r\nContent-Type: ") && s->content_type)
745  len += av_strlcatf(headers + len, sizeof(headers) - len,
746  "Content-Type: %s\r\n", s->content_type);
747  if (!has_header(s->headers, "\r\nCookie: ") && s->cookies) {
748  char *cookies = NULL;
749  if (!get_cookies(s, &cookies, path, hoststr)) {
750  len += av_strlcatf(headers + len, sizeof(headers) - len,
751  "Cookie: %s\r\n", cookies);
752  av_free(cookies);
753  }
754  }
755  if (!has_header(s->headers, "\r\nIcy-MetaData: ") && s->icy) {
756  len += av_strlcatf(headers + len, sizeof(headers) - len,
757  "Icy-MetaData: %d\r\n", 1);
758  }
759 
760  /* now add in custom headers */
761  if (s->headers)
762  av_strlcpy(headers + len, s->headers, sizeof(headers) - len);
763 
764  snprintf(s->buffer, sizeof(s->buffer),
765  "%s %s HTTP/1.1\r\n"
766  "%s"
767  "%s"
768  "%s"
769  "%s%s"
770  "\r\n",
771  method,
772  path,
773  post && s->chunked_post ? "Transfer-Encoding: chunked\r\n" : "",
774  headers,
775  authstr ? authstr : "",
776  proxyauthstr ? "Proxy-" : "", proxyauthstr ? proxyauthstr : "");
777 
778  av_freep(&authstr);
779  av_freep(&proxyauthstr);
780 
781  av_log(h, AV_LOG_DEBUG, "request: %s\n", s->buffer);
782 
783  if ((err = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0)
784  return err;
785 
786  if (s->post_data)
787  if ((err = ffurl_write(s->hd, s->post_data, s->post_datalen)) < 0)
788  return err;
789 
790  /* init input buffer */
791  s->buf_ptr = s->buffer;
792  s->buf_end = s->buffer;
793  s->line_count = 0;
794  s->off = 0;
795  s->icy_data_read = 0;
796  s->filesize = -1;
797  s->willclose = 0;
798  s->end_chunked_post = 0;
799  s->end_header = 0;
800  if (post && !s->post_data && !send_expect_100) {
801  /* Pretend that it did work. We didn't read any header yet, since
802  * we've still to send the POST data, but the code calling this
803  * function will check http_code after we return. */
804  s->http_code = 200;
805  return 0;
806  }
807 
808  /* wait for header */
809  err = http_read_header(h, new_location);
810  if (err < 0)
811  return err;
812 
813  return (off == s->off) ? 0 : -1;
814 }
815 
816 
817 static int http_buf_read(URLContext *h, uint8_t *buf, int size)
818 {
819  HTTPContext *s = h->priv_data;
820  int len;
821  /* read bytes from input buffer first */
822  len = s->buf_end - s->buf_ptr;
823  if (len > 0) {
824  if (len > size)
825  len = size;
826  memcpy(buf, s->buf_ptr, len);
827  s->buf_ptr += len;
828  } else {
829  if (!s->willclose && s->filesize >= 0 && s->off >= s->filesize)
830  return AVERROR_EOF;
831  len = ffurl_read(s->hd, buf, size);
832  }
833  if (len > 0) {
834  s->off += len;
835  if (s->chunksize > 0)
836  s->chunksize -= len;
837  }
838  return len;
839 }
840 
841 #if CONFIG_ZLIB
842 #define DECOMPRESS_BUF_SIZE (256 * 1024)
843 static int http_buf_read_compressed(URLContext *h, uint8_t *buf, int size)
844 {
845  HTTPContext *s = h->priv_data;
846  int ret;
847 
848  if (!s->inflate_buffer) {
849  s->inflate_buffer = av_malloc(DECOMPRESS_BUF_SIZE);
850  if (!s->inflate_buffer)
851  return AVERROR(ENOMEM);
852  }
853 
854  if (s->inflate_stream.avail_in == 0) {
855  int read = http_buf_read(h, s->inflate_buffer, DECOMPRESS_BUF_SIZE);
856  if (read <= 0)
857  return read;
858  s->inflate_stream.next_in = s->inflate_buffer;
859  s->inflate_stream.avail_in = read;
860  }
861 
862  s->inflate_stream.avail_out = size;
863  s->inflate_stream.next_out = buf;
864 
865  ret = inflate(&s->inflate_stream, Z_SYNC_FLUSH);
866  if (ret != Z_OK && ret != Z_STREAM_END)
867  av_log(h, AV_LOG_WARNING, "inflate return value: %d, %s\n", ret, s->inflate_stream.msg);
868 
869  return size - s->inflate_stream.avail_out;
870 }
871 #endif
872 
873 static int http_read_stream(URLContext *h, uint8_t *buf, int size)
874 {
875  HTTPContext *s = h->priv_data;
876  int err, new_location;
877 
878  if (!s->hd)
879  return AVERROR_EOF;
880 
881  if (s->end_chunked_post && !s->end_header) {
882  err = http_read_header(h, &new_location);
883  if (err < 0)
884  return err;
885  }
886 
887  if (s->chunksize >= 0) {
888  if (!s->chunksize) {
889  char line[32];
890 
891  for(;;) {
892  do {
893  if ((err = http_get_line(s, line, sizeof(line))) < 0)
894  return err;
895  } while (!*line); /* skip CR LF from last chunk */
896 
897  s->chunksize = strtoll(line, NULL, 16);
898 
899  av_dlog(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
900 
901  if (!s->chunksize)
902  return 0;
903  break;
904  }
905  }
906  size = FFMIN(size, s->chunksize);
907  }
908 #if CONFIG_ZLIB
909  if (s->compressed)
910  return http_buf_read_compressed(h, buf, size);
911 #endif
912  return http_buf_read(h, buf, size);
913 }
914 
915 // Like http_read_stream(), but no short reads.
916 // Assumes partial reads are an error.
917 static int http_read_stream_all(URLContext *h, uint8_t *buf, int size)
918 {
919  int pos = 0;
920  while (pos < size) {
921  int len = http_read_stream(h, buf + pos, size - pos);
922  if (len < 0)
923  return len;
924  pos += len;
925  }
926  return pos;
927 }
928 
929 static int store_icy(URLContext *h, int size)
930 {
931  HTTPContext *s = h->priv_data;
932  /* until next metadata packet */
933  int remaining = s->icy_metaint - s->icy_data_read;
934 
935  if (remaining < 0)
936  return AVERROR_INVALIDDATA;
937 
938  if (!remaining) {
939  // The metadata packet is variable sized. It has a 1 byte header
940  // which sets the length of the packet (divided by 16). If it's 0,
941  // the metadata doesn't change. After the packet, icy_metaint bytes
942  // of normal data follow.
943  uint8_t ch;
944  int len = http_read_stream_all(h, &ch, 1);
945  if (len < 0)
946  return len;
947  if (ch > 0) {
948  char data[255 * 16 + 1];
949  int ret;
950  len = ch * 16;
951  ret = http_read_stream_all(h, data, len);
952  if (ret < 0)
953  return ret;
954  data[len + 1] = 0;
955  if ((ret = av_opt_set(s, "icy_metadata_packet", data, 0)) < 0)
956  return ret;
957  }
958  s->icy_data_read = 0;
959  remaining = s->icy_metaint;
960  }
961 
962  return FFMIN(size, remaining);
963 }
964 
965 static int http_read(URLContext *h, uint8_t *buf, int size)
966 {
967  HTTPContext *s = h->priv_data;
968 
969  if (s->icy_metaint > 0) {
970  size = store_icy(h, size);
971  if (size < 0)
972  return size;
973  }
974 
975  size = http_read_stream(h, buf, size);
976  if (size > 0)
977  s->icy_data_read += size;
978  return size;
979 }
980 
981 /* used only when posting data */
982 static int http_write(URLContext *h, const uint8_t *buf, int size)
983 {
984  char temp[11] = ""; /* 32-bit hex + CRLF + nul */
985  int ret;
986  char crlf[] = "\r\n";
987  HTTPContext *s = h->priv_data;
988 
989  if (!s->chunked_post) {
990  /* non-chunked data is sent without any special encoding */
991  return ffurl_write(s->hd, buf, size);
992  }
993 
994  /* silently ignore zero-size data since chunk encoding that would
995  * signal EOF */
996  if (size > 0) {
997  /* upload data using chunked encoding */
998  snprintf(temp, sizeof(temp), "%x\r\n", size);
999 
1000  if ((ret = ffurl_write(s->hd, temp, strlen(temp))) < 0 ||
1001  (ret = ffurl_write(s->hd, buf, size)) < 0 ||
1002  (ret = ffurl_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
1003  return ret;
1004  }
1005  return size;
1006 }
1007 
1008 static int http_shutdown(URLContext *h, int flags)
1009 {
1010  int ret = 0;
1011  char footer[] = "0\r\n\r\n";
1012  HTTPContext *s = h->priv_data;
1013 
1014  /* signal end of chunked encoding if used */
1015  if ((flags & AVIO_FLAG_WRITE) && s->chunked_post) {
1016  ret = ffurl_write(s->hd, footer, sizeof(footer) - 1);
1017  ret = ret > 0 ? 0 : ret;
1018  s->end_chunked_post = 1;
1019  }
1020 
1021  return ret;
1022 }
1023 
1024 static int http_close(URLContext *h)
1025 {
1026  int ret = 0;
1027  HTTPContext *s = h->priv_data;
1028 
1029 #if CONFIG_ZLIB
1030  inflateEnd(&s->inflate_stream);
1031  av_freep(&s->inflate_buffer);
1032 #endif
1033 
1034  if (!s->end_chunked_post) {
1035  /* Close the write direction by sending the end of chunked encoding. */
1036  ret = http_shutdown(h, h->flags);
1037  }
1038 
1039  if (s->hd)
1040  ffurl_closep(&s->hd);
1042  return ret;
1043 }
1044 
1045 static int64_t http_seek(URLContext *h, int64_t off, int whence)
1046 {
1047  HTTPContext *s = h->priv_data;
1048  URLContext *old_hd = s->hd;
1049  int64_t old_off = s->off;
1050  uint8_t old_buf[BUFFER_SIZE];
1051  int old_buf_size, ret;
1052  AVDictionary *options = NULL;
1053 
1054  if (whence == AVSEEK_SIZE)
1055  return s->filesize;
1056  else if ((whence == SEEK_CUR && off == 0) ||
1057  (whence == SEEK_SET && off == s->off))
1058  return s->off;
1059  else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
1060  return AVERROR(ENOSYS);
1061 
1062  /* we save the old context in case the seek fails */
1063  old_buf_size = s->buf_end - s->buf_ptr;
1064  memcpy(old_buf, s->buf_ptr, old_buf_size);
1065  s->hd = NULL;
1066  if (whence == SEEK_CUR)
1067  off += s->off;
1068  else if (whence == SEEK_END)
1069  off += s->filesize;
1070  s->off = off;
1071 
1072  /* if it fails, continue on old connection */
1073  av_dict_copy(&options, s->chained_options, 0);
1074  if ((ret = http_open_cnx(h, &options)) < 0) {
1075  av_dict_free(&options);
1076  memcpy(s->buffer, old_buf, old_buf_size);
1077  s->buf_ptr = s->buffer;
1078  s->buf_end = s->buffer + old_buf_size;
1079  s->hd = old_hd;
1080  s->off = old_off;
1081  return ret;
1082  }
1083  av_dict_free(&options);
1084  ffurl_close(old_hd);
1085  return off;
1086 }
1087 
1088 static int
1090 {
1091  HTTPContext *s = h->priv_data;
1092  return ffurl_get_file_handle(s->hd);
1093 }
1094 
1095 #if CONFIG_HTTP_PROTOCOL
1096 URLProtocol ff_http_protocol = {
1097  .name = "http",
1098  .url_open2 = http_open,
1099  .url_read = http_read,
1100  .url_write = http_write,
1101  .url_seek = http_seek,
1102  .url_close = http_close,
1103  .url_get_file_handle = http_get_file_handle,
1104  .url_shutdown = http_shutdown,
1105  .priv_data_size = sizeof(HTTPContext),
1106  .priv_data_class = &http_context_class,
1108 };
1109 #endif
1110 #if CONFIG_HTTPS_PROTOCOL
1111 URLProtocol ff_https_protocol = {
1112  .name = "https",
1113  .url_open2 = http_open,
1114  .url_read = http_read,
1115  .url_write = http_write,
1116  .url_seek = http_seek,
1117  .url_close = http_close,
1118  .url_get_file_handle = http_get_file_handle,
1119  .url_shutdown = http_shutdown,
1120  .priv_data_size = sizeof(HTTPContext),
1121  .priv_data_class = &https_context_class,
1123 };
1124 #endif
1125 
1126 #if CONFIG_HTTPPROXY_PROTOCOL
1127 static int http_proxy_close(URLContext *h)
1128 {
1129  HTTPContext *s = h->priv_data;
1130  if (s->hd)
1131  ffurl_closep(&s->hd);
1132  return 0;
1133 }
1134 
1135 static int http_proxy_open(URLContext *h, const char *uri, int flags)
1136 {
1137  HTTPContext *s = h->priv_data;
1138  char hostname[1024], hoststr[1024];
1139  char auth[1024], pathbuf[1024], *path;
1140  char lower_url[100];
1141  int port, ret = 0, attempts = 0;
1142  HTTPAuthType cur_auth_type;
1143  char *authstr;
1144  int new_loc;
1145 
1146  if( s->seekable == 1 )
1147  h->is_streamed = 0;
1148  else
1149  h->is_streamed = 1;
1150 
1151  av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
1152  pathbuf, sizeof(pathbuf), uri);
1153  ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
1154  path = pathbuf;
1155  if (*path == '/')
1156  path++;
1157 
1158  ff_url_join(lower_url, sizeof(lower_url), "tcp", NULL, hostname, port,
1159  NULL);
1160 redo:
1161  ret = ffurl_open(&s->hd, lower_url, AVIO_FLAG_READ_WRITE,
1162  &h->interrupt_callback, NULL);
1163  if (ret < 0)
1164  return ret;
1165 
1166  authstr = ff_http_auth_create_response(&s->proxy_auth_state, auth,
1167  path, "CONNECT");
1168  snprintf(s->buffer, sizeof(s->buffer),
1169  "CONNECT %s HTTP/1.1\r\n"
1170  "Host: %s\r\n"
1171  "Connection: close\r\n"
1172  "%s%s"
1173  "\r\n",
1174  path,
1175  hoststr,
1176  authstr ? "Proxy-" : "", authstr ? authstr : "");
1177  av_freep(&authstr);
1178 
1179  if ((ret = ffurl_write(s->hd, s->buffer, strlen(s->buffer))) < 0)
1180  goto fail;
1181 
1182  s->buf_ptr = s->buffer;
1183  s->buf_end = s->buffer;
1184  s->line_count = 0;
1185  s->filesize = -1;
1186  cur_auth_type = s->proxy_auth_state.auth_type;
1187 
1188  /* Note: This uses buffering, potentially reading more than the
1189  * HTTP header. If tunneling a protocol where the server starts
1190  * the conversation, we might buffer part of that here, too.
1191  * Reading that requires using the proper ffurl_read() function
1192  * on this URLContext, not using the fd directly (as the tls
1193  * protocol does). This shouldn't be an issue for tls though,
1194  * since the client starts the conversation there, so there
1195  * is no extra data that we might buffer up here.
1196  */
1197  ret = http_read_header(h, &new_loc);
1198  if (ret < 0)
1199  goto fail;
1200 
1201  attempts++;
1202  if (s->http_code == 407 &&
1203  (cur_auth_type == HTTP_AUTH_NONE || s->proxy_auth_state.stale) &&
1204  s->proxy_auth_state.auth_type != HTTP_AUTH_NONE && attempts < 2) {
1205  ffurl_closep(&s->hd);
1206  goto redo;
1207  }
1208 
1209  if (s->http_code < 400)
1210  return 0;
1211  ret = AVERROR(EIO);
1212 
1213 fail:
1214  http_proxy_close(h);
1215  return ret;
1216 }
1217 
1218 static int http_proxy_write(URLContext *h, const uint8_t *buf, int size)
1219 {
1220  HTTPContext *s = h->priv_data;
1221  return ffurl_write(s->hd, buf, size);
1222 }
1223 
1224 URLProtocol ff_httpproxy_protocol = {
1225  .name = "httpproxy",
1226  .url_open = http_proxy_open,
1227  .url_read = http_buf_read,
1228  .url_write = http_proxy_write,
1229  .url_close = http_proxy_close,
1230  .url_get_file_handle = http_get_file_handle,
1231  .priv_data_size = sizeof(HTTPContext),
1232  .flags = URL_PROTOCOL_FLAG_NETWORK,
1233 };
1234 #endif