2 * HTTP protocol for avconv client
3 * Copyright (c) 2000, 2001 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
28 #include "os_support.h"
31 #include "libavutil/opt.h"
33 /* XXX: POST protocol is not completely implemented because avconv uses
34 only a subset of it. */
36 /* used for protocol handling */
37 #define BUFFER_SIZE 1024
38 #define MAX_REDIRECTS 8
43 unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
46 int64_t chunksize; /**< Used if "Transfer-Encoding: chunked" otherwise -1. */
47 int64_t off, filesize;
48 char location[MAX_URL_SIZE];
49 HTTPAuthState auth_state;
50 HTTPAuthState proxy_auth_state;
52 int willclose; /**< Set if the server correctly handles Connection: close and will close the connection after feeding us the content. */
56 #define OFFSET(x) offsetof(HTTPContext, x)
57 #define D AV_OPT_FLAG_DECODING_PARAM
58 #define E AV_OPT_FLAG_ENCODING_PARAM
59 static const AVOption options[] = {
60 {"chunked_post", "use chunked transfer-encoding for posts", OFFSET(chunked_post), AV_OPT_TYPE_INT, {.dbl = 1}, 0, 1, E },
61 {"headers", "custom HTTP headers, can override built in default headers", OFFSET(headers), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
64 #define HTTP_CLASS(flavor)\
65 static const AVClass flavor ## _context_class = {\
66 .class_name = #flavor,\
67 .item_name = av_default_item_name,\
69 .version = LIBAVUTIL_VERSION_INT,\
75 static int http_connect(URLContext *h, const char *path, const char *local_path,
76 const char *hoststr, const char *auth,
77 const char *proxyauth, int *new_location);
79 void ff_http_init_auth_state(URLContext *dest, const URLContext *src)
81 memcpy(&((HTTPContext*)dest->priv_data)->auth_state,
82 &((HTTPContext*)src->priv_data)->auth_state, sizeof(HTTPAuthState));
83 memcpy(&((HTTPContext*)dest->priv_data)->proxy_auth_state,
84 &((HTTPContext*)src->priv_data)->proxy_auth_state,
85 sizeof(HTTPAuthState));
88 /* return non zero if error */
89 static int http_open_cnx(URLContext *h)
91 const char *path, *proxy_path, *lower_proto = "tcp", *local_path;
92 char hostname[1024], hoststr[1024], proto[10];
93 char auth[1024], proxyauth[1024];
95 char buf[1024], urlbuf[1024];
96 int port, use_proxy, err, location_changed = 0, redirects = 0;
97 HTTPAuthType cur_auth_type, cur_proxy_auth_type;
98 HTTPContext *s = h->priv_data;
99 URLContext *hd = NULL;
101 proxy_path = getenv("http_proxy");
102 use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
103 av_strstart(proxy_path, "http://", NULL);
105 /* fill the dest addr */
107 /* needed in any case to build the host string */
108 av_url_split(proto, sizeof(proto), auth, sizeof(auth),
109 hostname, sizeof(hostname), &port,
110 path1, sizeof(path1), s->location);
111 ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
113 if (path1[0] == '\0')
119 /* Reassemble the request URL without auth string - we don't
120 * want to leak the auth to the proxy. */
121 ff_url_join(urlbuf, sizeof(urlbuf), proto, NULL, hostname, port, "%s",
124 av_url_split(NULL, 0, proxyauth, sizeof(proxyauth),
125 hostname, sizeof(hostname), &port, NULL, 0, proxy_path);
127 if (!strcmp(proto, "https")) {
135 ff_url_join(buf, sizeof(buf), lower_proto, NULL, hostname, port, NULL);
136 err = ffurl_open(&hd, buf, AVIO_FLAG_READ_WRITE);
141 cur_auth_type = s->auth_state.auth_type;
142 cur_proxy_auth_type = s->auth_state.auth_type;
143 if (http_connect(h, path, local_path, hoststr, auth, proxyauth, &location_changed) < 0)
145 if (s->http_code == 401) {
146 if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
152 if (s->http_code == 407) {
153 if (cur_proxy_auth_type == HTTP_AUTH_NONE &&
154 s->proxy_auth_state.auth_type != HTTP_AUTH_NONE) {
160 if ((s->http_code == 301 || s->http_code == 302 || s->http_code == 303 || s->http_code == 307)
161 && location_changed == 1) {
162 /* url moved, get next */
164 if (redirects++ >= MAX_REDIRECTS)
166 location_changed = 0;
177 static int http_open(URLContext *h, const char *uri, int flags)
179 HTTPContext *s = h->priv_data;
184 av_strlcpy(s->location, uri, sizeof(s->location));
187 int len = strlen(s->headers);
188 if (len < 2 || strcmp("\r\n", s->headers + len - 2))
189 av_log(h, AV_LOG_WARNING, "No trailing CRLF found in HTTP header.\n");
192 return http_open_cnx(h);
194 static int http_getc(HTTPContext *s)
197 if (s->buf_ptr >= s->buf_end) {
198 len = ffurl_read(s->hd, s->buffer, BUFFER_SIZE);
201 } else if (len == 0) {
204 s->buf_ptr = s->buffer;
205 s->buf_end = s->buffer + len;
208 return *s->buf_ptr++;
211 static int http_get_line(HTTPContext *s, char *line, int line_size)
223 if (q > line && q[-1] == '\r')
229 if ((q - line) < line_size - 1)
235 static int process_line(URLContext *h, char *line, int line_count,
238 HTTPContext *s = h->priv_data;
246 if (line_count == 0) {
247 while (!isspace(*p) && *p != '\0')
251 s->http_code = strtol(p, &end, 10);
253 av_dlog(NULL, "http_code=%d\n", s->http_code);
255 /* error codes are 4xx and 5xx, but regard 401 as a success, so we
256 * don't abort until all headers have been parsed. */
257 if (s->http_code >= 400 && s->http_code < 600 && (s->http_code != 401
258 || s->auth_state.auth_type != HTTP_AUTH_NONE) &&
259 (s->http_code != 407 || s->proxy_auth_state.auth_type != HTTP_AUTH_NONE)) {
260 end += strspn(end, SPACE_CHARS);
261 av_log(h, AV_LOG_WARNING, "HTTP error %d %s\n",
266 while (*p != '\0' && *p != ':')
276 if (!av_strcasecmp(tag, "Location")) {
277 strcpy(s->location, p);
279 } else if (!av_strcasecmp (tag, "Content-Length") && s->filesize == -1) {
280 s->filesize = atoll(p);
281 } else if (!av_strcasecmp (tag, "Content-Range")) {
282 /* "bytes $from-$to/$document_size" */
284 if (!strncmp (p, "bytes ", 6)) {
287 if ((slash = strchr(p, '/')) && strlen(slash) > 0)
288 s->filesize = atoll(slash+1);
290 h->is_streamed = 0; /* we _can_ in fact seek */
291 } else if (!av_strcasecmp(tag, "Accept-Ranges") && !strncmp(p, "bytes", 5)) {
293 } else if (!av_strcasecmp (tag, "Transfer-Encoding") && !av_strncasecmp(p, "chunked", 7)) {
296 } else if (!av_strcasecmp (tag, "WWW-Authenticate")) {
297 ff_http_auth_handle_header(&s->auth_state, tag, p);
298 } else if (!av_strcasecmp (tag, "Authentication-Info")) {
299 ff_http_auth_handle_header(&s->auth_state, tag, p);
300 } else if (!av_strcasecmp (tag, "Proxy-Authenticate")) {
301 ff_http_auth_handle_header(&s->proxy_auth_state, tag, p);
302 } else if (!av_strcasecmp (tag, "Connection")) {
303 if (!strcmp(p, "close"))
310 static inline int has_header(const char *str, const char *header)
312 /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
315 return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
318 static int http_connect(URLContext *h, const char *path, const char *local_path,
319 const char *hoststr, const char *auth,
320 const char *proxyauth, int *new_location)
322 HTTPContext *s = h->priv_data;
325 char headers[1024] = "";
326 char *authstr = NULL, *proxyauthstr = NULL;
327 int64_t off = s->off;
332 /* send http header */
333 post = h->flags & AVIO_FLAG_WRITE;
334 method = post ? "POST" : "GET";
335 authstr = ff_http_auth_create_response(&s->auth_state, auth, local_path,
337 proxyauthstr = ff_http_auth_create_response(&s->proxy_auth_state, proxyauth,
340 /* set default headers if needed */
341 if (!has_header(s->headers, "\r\nUser-Agent: "))
342 len += av_strlcatf(headers + len, sizeof(headers) - len,
343 "User-Agent: %s\r\n", LIBAVFORMAT_IDENT);
344 if (!has_header(s->headers, "\r\nAccept: "))
345 len += av_strlcpy(headers + len, "Accept: */*\r\n",
346 sizeof(headers) - len);
347 if (!has_header(s->headers, "\r\nRange: ") && !post)
348 len += av_strlcatf(headers + len, sizeof(headers) - len,
349 "Range: bytes=%"PRId64"-\r\n", s->off);
350 if (!has_header(s->headers, "\r\nConnection: "))
351 len += av_strlcpy(headers + len, "Connection: close\r\n",
352 sizeof(headers)-len);
353 if (!has_header(s->headers, "\r\nHost: "))
354 len += av_strlcatf(headers + len, sizeof(headers) - len,
355 "Host: %s\r\n", hoststr);
357 /* now add in custom headers */
359 av_strlcpy(headers + len, s->headers, sizeof(headers) - len);
361 snprintf(s->buffer, sizeof(s->buffer),
370 post && s->chunked_post ? "Transfer-Encoding: chunked\r\n" : "",
372 authstr ? authstr : "",
373 proxyauthstr ? "Proxy-" : "", proxyauthstr ? proxyauthstr : "");
376 av_freep(&proxyauthstr);
377 if (ffurl_write(s->hd, s->buffer, strlen(s->buffer)) < 0)
380 /* init input buffer */
381 s->buf_ptr = s->buffer;
382 s->buf_end = s->buffer;
388 /* Pretend that it did work. We didn't read any header yet, since
389 * we've still to send the POST data, but the code calling this
390 * function will check http_code after we return. */
396 /* wait for header */
398 if (http_get_line(s, line, sizeof(line)) < 0)
401 av_dlog(NULL, "header='%s'\n", line);
403 err = process_line(h, line, s->line_count, new_location);
411 return (off == s->off) ? 0 : -1;
415 static int http_read(URLContext *h, uint8_t *buf, int size)
417 HTTPContext *s = h->priv_data;
420 if (s->chunksize >= 0) {
426 if (http_get_line(s, line, sizeof(line)) < 0)
428 } while (!*line); /* skip CR LF from last chunk */
430 s->chunksize = strtoll(line, NULL, 16);
432 av_dlog(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
439 size = FFMIN(size, s->chunksize);
441 /* read bytes from input buffer first */
442 len = s->buf_end - s->buf_ptr;
446 memcpy(buf, s->buf_ptr, len);
449 if (!s->willclose && s->filesize >= 0 && s->off >= s->filesize)
451 len = ffurl_read(s->hd, buf, size);
455 if (s->chunksize > 0)
461 /* used only when posting data */
462 static int http_write(URLContext *h, const uint8_t *buf, int size)
464 char temp[11] = ""; /* 32-bit hex + CRLF + nul */
466 char crlf[] = "\r\n";
467 HTTPContext *s = h->priv_data;
469 if (!s->chunked_post) {
470 /* non-chunked data is sent without any special encoding */
471 return ffurl_write(s->hd, buf, size);
474 /* silently ignore zero-size data since chunk encoding that would
477 /* upload data using chunked encoding */
478 snprintf(temp, sizeof(temp), "%x\r\n", size);
480 if ((ret = ffurl_write(s->hd, temp, strlen(temp))) < 0 ||
481 (ret = ffurl_write(s->hd, buf, size)) < 0 ||
482 (ret = ffurl_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
488 static int http_close(URLContext *h)
491 char footer[] = "0\r\n\r\n";
492 HTTPContext *s = h->priv_data;
494 /* signal end of chunked encoding if used */
495 if ((h->flags & AVIO_FLAG_WRITE) && s->chunked_post) {
496 ret = ffurl_write(s->hd, footer, sizeof(footer) - 1);
497 ret = ret > 0 ? 0 : ret;
505 static int64_t http_seek(URLContext *h, int64_t off, int whence)
507 HTTPContext *s = h->priv_data;
508 URLContext *old_hd = s->hd;
509 int64_t old_off = s->off;
510 uint8_t old_buf[BUFFER_SIZE];
513 if (whence == AVSEEK_SIZE)
515 else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
518 /* we save the old context in case the seek fails */
519 old_buf_size = s->buf_end - s->buf_ptr;
520 memcpy(old_buf, s->buf_ptr, old_buf_size);
522 if (whence == SEEK_CUR)
524 else if (whence == SEEK_END)
528 /* if it fails, continue on old connection */
529 if (http_open_cnx(h) < 0) {
530 memcpy(s->buffer, old_buf, old_buf_size);
531 s->buf_ptr = s->buffer;
532 s->buf_end = s->buffer + old_buf_size;
542 http_get_file_handle(URLContext *h)
544 HTTPContext *s = h->priv_data;
545 return ffurl_get_file_handle(s->hd);
548 #if CONFIG_HTTP_PROTOCOL
549 URLProtocol ff_http_protocol = {
551 .url_open = http_open,
552 .url_read = http_read,
553 .url_write = http_write,
554 .url_seek = http_seek,
555 .url_close = http_close,
556 .url_get_file_handle = http_get_file_handle,
557 .priv_data_size = sizeof(HTTPContext),
558 .priv_data_class = &http_context_class,
561 #if CONFIG_HTTPS_PROTOCOL
562 URLProtocol ff_https_protocol = {
564 .url_open = http_open,
565 .url_read = http_read,
566 .url_write = http_write,
567 .url_seek = http_seek,
568 .url_close = http_close,
569 .url_get_file_handle = http_get_file_handle,
570 .priv_data_size = sizeof(HTTPContext),
571 .priv_data_class = &https_context_class,