3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/time.h"
26 #include "libavutil/avassert.h"
27 #include "os_support.h"
34 /** @name Logging context. */
36 static const char *urlcontext_to_name(void *ptr)
38 URLContext *h = (URLContext *)ptr;
45 static void *urlcontext_child_next(void *obj, void *prev)
48 if (!prev && h->priv_data && h->prot->priv_data_class)
53 #define OFFSET(x) offsetof(URLContext,x)
54 #define E AV_OPT_FLAG_ENCODING_PARAM
55 #define D AV_OPT_FLAG_DECODING_PARAM
56 static const AVOption options[] = {
57 {"protocol_whitelist", "List of protocols that are allowed to be used", OFFSET(protocol_whitelist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, D },
58 {"protocol_blacklist", "List of protocols that are not allowed to be used", OFFSET(protocol_blacklist), AV_OPT_TYPE_STRING, { .str = NULL }, CHAR_MIN, CHAR_MAX, D },
62 const AVClass ffurl_context_class = {
63 .class_name = "URLContext",
64 .item_name = urlcontext_to_name,
66 .version = LIBAVUTIL_VERSION_INT,
67 .child_next = urlcontext_child_next,
68 .child_class_next = ff_urlcontext_child_class_next,
72 static int url_alloc_for_protocol(URLContext **puc, const URLProtocol *up,
73 const char *filename, int flags,
74 const AVIOInterruptCB *int_cb)
80 if (up->flags & URL_PROTOCOL_FLAG_NETWORK && !ff_network_init())
83 if ((flags & AVIO_FLAG_READ) && !up->url_read) {
84 av_log(NULL, AV_LOG_ERROR,
85 "Impossible to open the '%s' protocol for reading\n", up->name);
88 if ((flags & AVIO_FLAG_WRITE) && !up->url_write) {
89 av_log(NULL, AV_LOG_ERROR,
90 "Impossible to open the '%s' protocol for writing\n", up->name);
93 uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
95 err = AVERROR(ENOMEM);
98 uc->av_class = &ffurl_context_class;
99 uc->filename = (char *)&uc[1];
100 strcpy(uc->filename, filename);
103 uc->is_streamed = 0; /* default = not streamed */
104 uc->max_packet_size = 0; /* default: stream file */
105 if (up->priv_data_size) {
106 uc->priv_data = av_mallocz(up->priv_data_size);
107 if (!uc->priv_data) {
108 err = AVERROR(ENOMEM);
111 if (up->priv_data_class) {
112 int proto_len= strlen(up->name);
113 char *start = strchr(uc->filename, ',');
114 *(const AVClass **)uc->priv_data = up->priv_data_class;
115 av_opt_set_defaults(uc->priv_data);
116 if(!strncmp(up->name, uc->filename, proto_len) && uc->filename + proto_len == start){
123 if (strcmp(up->name, "subfile"))
124 ret = AVERROR(EINVAL);
126 while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){
128 if (strcmp(p, "start") && strcmp(p, "end")) {
129 ret = AVERROR_OPTION_NOT_FOUND;
131 ret= av_opt_set(uc->priv_data, p, key+1, 0);
132 if (ret == AVERROR_OPTION_NOT_FOUND)
133 av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p);
138 av_log(uc, AV_LOG_ERROR, "Error parsing options string %s\n", start);
139 av_freep(&uc->priv_data);
141 err = AVERROR(EINVAL);
144 memmove(start, key+1, strlen(key));
149 uc->interrupt_callback = *int_cb;
156 av_freep(&uc->priv_data);
159 if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
165 int ffurl_connect(URLContext *uc, AVDictionary **options)
168 AVDictionary *tmp_opts = NULL;
169 AVDictionaryEntry *e;
174 // Check that URLContext was initialized correctly and lists are matching if set
175 av_assert0(!(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
176 (uc->protocol_whitelist && !strcmp(uc->protocol_whitelist, e->value)));
177 av_assert0(!(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
178 (uc->protocol_blacklist && !strcmp(uc->protocol_blacklist, e->value)));
180 if (uc->protocol_whitelist && av_match_list(uc->prot->name, uc->protocol_whitelist, ',') <= 0) {
181 av_log(uc, AV_LOG_ERROR, "Protocol not on whitelist \'%s\'!\n", uc->protocol_whitelist);
182 return AVERROR(EINVAL);
185 if (uc->protocol_blacklist && av_match_list(uc->prot->name, uc->protocol_blacklist, ',') > 0) {
186 av_log(uc, AV_LOG_ERROR, "Protocol blacklisted \'%s\'!\n", uc->protocol_blacklist);
187 return AVERROR(EINVAL);
190 if (!uc->protocol_whitelist && uc->prot->default_whitelist) {
191 av_log(uc, AV_LOG_DEBUG, "Setting default whitelist '%s'\n", uc->prot->default_whitelist);
192 uc->protocol_whitelist = av_strdup(uc->prot->default_whitelist);
193 if (!uc->protocol_whitelist) {
194 return AVERROR(ENOMEM);
196 } else if (!uc->protocol_whitelist)
197 av_log(uc, AV_LOG_DEBUG, "No default whitelist set\n"); // This should be an error once all declare a default whitelist
199 if ((err = av_dict_set(options, "protocol_whitelist", uc->protocol_whitelist, 0)) < 0)
201 if ((err = av_dict_set(options, "protocol_blacklist", uc->protocol_blacklist, 0)) < 0)
205 uc->prot->url_open2 ? uc->prot->url_open2(uc,
209 uc->prot->url_open(uc, uc->filename, uc->flags);
211 av_dict_set(options, "protocol_whitelist", NULL, 0);
212 av_dict_set(options, "protocol_blacklist", NULL, 0);
216 uc->is_connected = 1;
217 /* We must be careful here as ffurl_seek() could be slow,
218 * for example for http */
219 if ((uc->flags & AVIO_FLAG_WRITE) || !strcmp(uc->prot->name, "file"))
220 if (!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
225 int ffurl_accept(URLContext *s, URLContext **c)
228 if (s->prot->url_accept)
229 return s->prot->url_accept(s, c);
230 return AVERROR(EBADF);
233 int ffurl_handshake(URLContext *c)
236 if (c->prot->url_handshake) {
237 ret = c->prot->url_handshake(c);
245 #define URL_SCHEME_CHARS \
246 "abcdefghijklmnopqrstuvwxyz" \
247 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
250 static const struct URLProtocol *url_find_protocol(const char *filename)
252 const URLProtocol *up;
253 const URLProtocol **protocols;
254 char proto_str[128], proto_nested[128], *ptr;
255 size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
258 if (filename[proto_len] != ':' &&
259 (strncmp(filename, "subfile,", 8) || !strchr(filename + proto_len + 1, ':')) ||
260 is_dos_path(filename))
261 strcpy(proto_str, "file");
263 av_strlcpy(proto_str, filename,
264 FFMIN(proto_len + 1, sizeof(proto_str)));
266 if ((ptr = strchr(proto_str, ',')))
268 av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
269 if ((ptr = strchr(proto_nested, '+')))
272 protocols = ffurl_get_protocols(NULL, NULL);
273 for (i = 0; protocols[i]; i++) {
275 if (!strcmp(proto_str, up->name))
277 if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
278 !strcmp(proto_nested, up->name))
281 av_freep(&protocols);
286 int ffurl_alloc(URLContext **puc, const char *filename, int flags,
287 const AVIOInterruptCB *int_cb)
289 const URLProtocol *p = NULL;
291 p = url_find_protocol(filename);
293 return url_alloc_for_protocol(puc, p, filename, flags, int_cb);
296 if (av_strstart(filename, "https:", NULL))
297 av_log(NULL, AV_LOG_WARNING, "https protocol not found, recompile FFmpeg with "
299 "or securetransport enabled.\n");
300 return AVERROR_PROTOCOL_NOT_FOUND;
303 int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags,
304 const AVIOInterruptCB *int_cb, AVDictionary **options,
305 const char *whitelist, const char* blacklist)
307 AVDictionary *tmp_opts = NULL;
308 AVDictionaryEntry *e;
309 int ret = ffurl_alloc(puc, filename, flags, int_cb);
312 if (options && (*puc)->prot->priv_data_class &&
313 (ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
319 av_assert0(!whitelist ||
320 !(e=av_dict_get(*options, "protocol_whitelist", NULL, 0)) ||
321 !strcmp(whitelist, e->value));
322 av_assert0(!blacklist ||
323 !(e=av_dict_get(*options, "protocol_blacklist", NULL, 0)) ||
324 !strcmp(blacklist, e->value));
326 if ((ret = av_dict_set(options, "protocol_whitelist", whitelist, 0)) < 0)
329 if ((ret = av_dict_set(options, "protocol_blacklist", blacklist, 0)) < 0)
332 if ((ret = av_opt_set_dict(*puc, options)) < 0)
335 ret = ffurl_connect(*puc, options);
345 int ffurl_open(URLContext **puc, const char *filename, int flags,
346 const AVIOInterruptCB *int_cb, AVDictionary **options)
348 return ffurl_open_whitelist(puc, filename, flags,
349 int_cb, options, NULL, NULL);
352 static inline int retry_transfer_wrapper(URLContext *h, uint8_t *buf,
353 int size, int size_min,
354 int (*transfer_func)(URLContext *h,
359 int fast_retries = 5;
360 int64_t wait_since = 0;
363 while (len < size_min) {
364 if (ff_check_interrupt(&h->interrupt_callback))
366 ret = transfer_func(h, buf + len, size - len);
367 if (ret == AVERROR(EINTR))
369 if (h->flags & AVIO_FLAG_NONBLOCK)
371 if (ret == AVERROR(EAGAIN)) {
378 wait_since = av_gettime_relative();
379 else if (av_gettime_relative() > wait_since + h->rw_timeout)
385 return (ret < 0 && ret != AVERROR_EOF) ? ret : len;
387 fast_retries = FFMAX(fast_retries, 2);
393 int ffurl_read(URLContext *h, unsigned char *buf, int size)
395 if (!(h->flags & AVIO_FLAG_READ))
397 return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
400 int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
402 if (!(h->flags & AVIO_FLAG_READ))
404 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
407 int ffurl_write(URLContext *h, const unsigned char *buf, int size)
409 if (!(h->flags & AVIO_FLAG_WRITE))
411 /* avoid sending too big packets */
412 if (h->max_packet_size && size > h->max_packet_size)
415 return retry_transfer_wrapper(h, (unsigned char *)buf, size, size,
416 (int (*)(struct URLContext *, uint8_t *, int))
420 int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
424 if (!h->prot->url_seek)
425 return AVERROR(ENOSYS);
426 ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
430 int ffurl_closep(URLContext **hh)
435 return 0; /* can happen when ffurl_open fails */
437 if (h->is_connected && h->prot->url_close)
438 ret = h->prot->url_close(h);
440 if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
443 if (h->prot->priv_data_size) {
444 if (h->prot->priv_data_class)
445 av_opt_free(h->priv_data);
446 av_freep(&h->priv_data);
453 int ffurl_close(URLContext *h)
455 return ffurl_closep(&h);
459 const char *avio_find_protocol_name(const char *url)
461 const URLProtocol *p = url_find_protocol(url);
463 return p ? p->name : NULL;
466 int avio_check(const char *url, int flags)
469 int ret = ffurl_alloc(&h, url, flags, NULL);
473 if (h->prot->url_check) {
474 ret = h->prot->url_check(h, flags);
476 ret = ffurl_connect(h, NULL);
485 int avpriv_io_move(const char *url_src, const char *url_dst)
487 URLContext *h_src, *h_dst;
488 int ret = ffurl_alloc(&h_src, url_src, AVIO_FLAG_READ_WRITE, NULL);
491 ret = ffurl_alloc(&h_dst, url_dst, AVIO_FLAG_WRITE, NULL);
497 if (h_src->prot == h_dst->prot && h_src->prot->url_move)
498 ret = h_src->prot->url_move(h_src, h_dst);
500 ret = AVERROR(ENOSYS);
507 int avpriv_io_delete(const char *url)
510 int ret = ffurl_alloc(&h, url, AVIO_FLAG_WRITE, NULL);
514 if (h->prot->url_delete)
515 ret = h->prot->url_delete(h);
517 ret = AVERROR(ENOSYS);
523 int avio_open_dir(AVIODirContext **s, const char *url, AVDictionary **options)
525 URLContext *h = NULL;
526 AVIODirContext *ctx = NULL;
530 ctx = av_mallocz(sizeof(*ctx));
532 ret = AVERROR(ENOMEM);
536 if ((ret = ffurl_alloc(&h, url, AVIO_FLAG_READ, NULL)) < 0)
539 if (h->prot->url_open_dir && h->prot->url_read_dir && h->prot->url_close_dir) {
540 if (options && h->prot->priv_data_class &&
541 (ret = av_opt_set_dict(h->priv_data, options)) < 0)
543 ret = h->prot->url_open_dir(h);
545 ret = AVERROR(ENOSYS);
550 ctx->url_context = h;
561 int avio_read_dir(AVIODirContext *s, AVIODirEntry **next)
566 if (!s || !s->url_context)
567 return AVERROR(EINVAL);
569 if ((ret = h->prot->url_read_dir(h, next)) < 0)
570 avio_free_directory_entry(next);
574 int avio_close_dir(AVIODirContext **s)
579 if (!(*s) || !(*s)->url_context)
580 return AVERROR(EINVAL);
581 h = (*s)->url_context;
582 h->prot->url_close_dir(h);
589 void avio_free_directory_entry(AVIODirEntry **entry)
591 if (!entry || !*entry)
593 av_free((*entry)->name);
597 int64_t ffurl_size(URLContext *h)
601 size = ffurl_seek(h, 0, AVSEEK_SIZE);
603 pos = ffurl_seek(h, 0, SEEK_CUR);
604 if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
607 ffurl_seek(h, pos, SEEK_SET);
612 int ffurl_get_file_handle(URLContext *h)
614 if (!h->prot->url_get_file_handle)
616 return h->prot->url_get_file_handle(h);
619 int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)
621 if (!h->prot->url_get_multi_file_handle) {
622 if (!h->prot->url_get_file_handle)
623 return AVERROR(ENOSYS);
624 *handles = av_malloc(sizeof(**handles));
626 return AVERROR(ENOMEM);
628 *handles[0] = h->prot->url_get_file_handle(h);
631 return h->prot->url_get_multi_file_handle(h, handles, numhandles);
634 int ffurl_shutdown(URLContext *h, int flags)
636 if (!h->prot->url_shutdown)
637 return AVERROR(EINVAL);
638 return h->prot->url_shutdown(h, flags);
641 int ff_check_interrupt(AVIOInterruptCB *cb)
644 if (cb && cb->callback && (ret = cb->callback(cb->opaque)))