Replace all occurrences of AVERROR_IO with AVERROR(EIO).
[libav.git] / libavformat / http.c
CommitLineData
558b86a5
LB
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#include "avformat.h"
22#include <unistd.h>
23#include "network.h"
24
25#include "base64.h"
75e61b0e 26#include "avstring.h"
558b86a5 27
e42dba48
DB
28/* XXX: POST protocol is not completely implemented because ffmpeg uses
29 only a subset of it. */
558b86a5
LB
30
31//#define DEBUG
32
33/* used for protocol handling */
34#define BUFFER_SIZE 1024
35#define URL_SIZE 4096
36#define MAX_REDIRECTS 8
37
38typedef struct {
39 URLContext *hd;
40 unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
41 int line_count;
42 int http_code;
43 offset_t off, filesize;
44 char location[URL_SIZE];
45} HTTPContext;
46
47static int http_connect(URLContext *h, const char *path, const char *hoststr,
48 const char *auth, int *new_location);
49static int http_write(URLContext *h, uint8_t *buf, int size);
50
51
52/* return non zero if error */
53static int http_open_cnx(URLContext *h)
54{
55 const char *path, *proxy_path;
56 char hostname[1024], hoststr[1024];
57 char auth[1024];
58 char path1[1024];
59 char buf[1024];
60 int port, use_proxy, err, location_changed = 0, redirects = 0;
61 HTTPContext *s = h->priv_data;
62 URLContext *hd = NULL;
63
64 proxy_path = getenv("http_proxy");
65 use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
f7d78f36 66 av_strstart(proxy_path, "http://", NULL);
558b86a5
LB
67
68 /* fill the dest addr */
69 redo:
70 /* needed in any case to build the host string */
71 url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
72 path1, sizeof(path1), s->location);
73 if (port > 0) {
74 snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
75 } else {
75e61b0e 76 av_strlcpy(hoststr, hostname, sizeof(hoststr));
558b86a5
LB
77 }
78
79 if (use_proxy) {
80 url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
81 NULL, 0, proxy_path);
82 path = s->location;
83 } else {
84 if (path1[0] == '\0')
85 path = "/";
86 else
87 path = path1;
88 }
89 if (port < 0)
90 port = 80;
91
92 snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
93 err = url_open(&hd, buf, URL_RDWR);
94 if (err < 0)
95 goto fail;
96
97 s->hd = hd;
98 if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
99 goto fail;
a3fd2bd8 100 if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) {
558b86a5
LB
101 /* url moved, get next */
102 url_close(hd);
103 if (redirects++ >= MAX_REDIRECTS)
6f3e0b21 104 return AVERROR(EIO);
558b86a5
LB
105 location_changed = 0;
106 goto redo;
107 }
108 return 0;
109 fail:
110 if (hd)
111 url_close(hd);
6f3e0b21 112 return AVERROR(EIO);
558b86a5
LB
113}
114
115static int http_open(URLContext *h, const char *uri, int flags)
116{
117 HTTPContext *s;
118 int ret;
119
120 h->is_streamed = 1;
121
122 s = av_malloc(sizeof(HTTPContext));
123 if (!s) {
124 return AVERROR(ENOMEM);
125 }
126 h->priv_data = s;
127 s->filesize = -1;
128 s->off = 0;
f7d78f36 129 av_strlcpy(s->location, uri, URL_SIZE);
558b86a5
LB
130
131 ret = http_open_cnx(h);
132 if (ret != 0)
133 av_free (s);
134 return ret;
135}
136static int http_getc(HTTPContext *s)
137{
138 int len;
139 if (s->buf_ptr >= s->buf_end) {
140 len = url_read(s->hd, s->buffer, BUFFER_SIZE);
141 if (len < 0) {
6f3e0b21 142 return AVERROR(EIO);
558b86a5
LB
143 } else if (len == 0) {
144 return -1;
145 } else {
146 s->buf_ptr = s->buffer;
147 s->buf_end = s->buffer + len;
148 }
149 }
150 return *s->buf_ptr++;
151}
152
153static int process_line(URLContext *h, char *line, int line_count,
154 int *new_location)
155{
156 HTTPContext *s = h->priv_data;
157 char *tag, *p;
158
159 /* end of header */
160 if (line[0] == '\0')
161 return 0;
162
163 p = line;
164 if (line_count == 0) {
165 while (!isspace(*p) && *p != '\0')
166 p++;
167 while (isspace(*p))
168 p++;
169 s->http_code = strtol(p, NULL, 10);
170#ifdef DEBUG
171 printf("http_code=%d\n", s->http_code);
172#endif
7b19aa64
AB
173 /* error codes are 4xx and 5xx */
174 if (s->http_code >= 400 && s->http_code < 600)
175 return -1;
558b86a5
LB
176 } else {
177 while (*p != '\0' && *p != ':')
178 p++;
179 if (*p != ':')
180 return 1;
181
182 *p = '\0';
183 tag = line;
184 p++;
185 while (isspace(*p))
186 p++;
187 if (!strcmp(tag, "Location")) {
188 strcpy(s->location, p);
189 *new_location = 1;
190 } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
191 s->filesize = atoll(p);
192 } else if (!strcmp (tag, "Content-Range")) {
193 /* "bytes $from-$to/$document_size" */
194 const char *slash;
195 if (!strncmp (p, "bytes ", 6)) {
196 p += 6;
197 s->off = atoll(p);
198 if ((slash = strchr(p, '/')) && strlen(slash) > 0)
199 s->filesize = atoll(slash+1);
200 }
201 h->is_streamed = 0; /* we _can_ in fact seek */
202 }
203 }
204 return 1;
205}
206
207static int http_connect(URLContext *h, const char *path, const char *hoststr,
208 const char *auth, int *new_location)
209{
210 HTTPContext *s = h->priv_data;
211 int post, err, ch;
212 char line[1024], *q;
213 char *auth_b64;
bd03c380 214 int auth_b64_len = strlen(auth)* 4 / 3 + 12;
558b86a5
LB
215 offset_t off = s->off;
216
217
218 /* send http header */
219 post = h->flags & URL_WRONLY;
bd03c380
LB
220 auth_b64 = av_malloc(auth_b64_len);
221 av_base64_encode(auth_b64, auth_b64_len, (uint8_t *)auth, strlen(auth));
558b86a5
LB
222 snprintf(s->buffer, sizeof(s->buffer),
223 "%s %s HTTP/1.1\r\n"
224 "User-Agent: %s\r\n"
225 "Accept: */*\r\n"
226 "Range: bytes=%"PRId64"-\r\n"
227 "Host: %s\r\n"
228 "Authorization: Basic %s\r\n"
167c5531 229 "Connection: close\r\n"
558b86a5
LB
230 "\r\n",
231 post ? "POST" : "GET",
232 path,
233 LIBAVFORMAT_IDENT,
234 s->off,
235 hoststr,
236 auth_b64);
237
238 av_freep(&auth_b64);
239 if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
6f3e0b21 240 return AVERROR(EIO);
558b86a5
LB
241
242 /* init input buffer */
243 s->buf_ptr = s->buffer;
244 s->buf_end = s->buffer;
245 s->line_count = 0;
246 s->off = 0;
ecb4a895 247 s->filesize = -1;
558b86a5 248 if (post) {
c8df9c63 249 usleep(1000*1000);
558b86a5
LB
250 return 0;
251 }
252
253 /* wait for header */
254 q = line;
255 for(;;) {
256 ch = http_getc(s);
257 if (ch < 0)
6f3e0b21 258 return AVERROR(EIO);
558b86a5
LB
259 if (ch == '\n') {
260 /* process line */
261 if (q > line && q[-1] == '\r')
262 q--;
263 *q = '\0';
264#ifdef DEBUG
265 printf("header='%s'\n", line);
266#endif
267 err = process_line(h, line, s->line_count, new_location);
268 if (err < 0)
269 return err;
270 if (err == 0)
271 break;
272 s->line_count++;
273 q = line;
274 } else {
275 if ((q - line) < sizeof(line) - 1)
276 *q++ = ch;
277 }
278 }
279
280 return (off == s->off) ? 0 : -1;
281}
282
283
284static int http_read(URLContext *h, uint8_t *buf, int size)
285{
286 HTTPContext *s = h->priv_data;
287 int len;
288
289 /* read bytes from input buffer first */
290 len = s->buf_end - s->buf_ptr;
291 if (len > 0) {
292 if (len > size)
293 len = size;
294 memcpy(buf, s->buf_ptr, len);
295 s->buf_ptr += len;
296 } else {
297 len = url_read(s->hd, buf, size);
298 }
299 if (len > 0)
300 s->off += len;
301 return len;
302}
303
304/* used only when posting data */
305static int http_write(URLContext *h, uint8_t *buf, int size)
306{
307 HTTPContext *s = h->priv_data;
308 return url_write(s->hd, buf, size);
309}
310
311static int http_close(URLContext *h)
312{
313 HTTPContext *s = h->priv_data;
314 url_close(s->hd);
315 av_free(s);
316 return 0;
317}
318
319static offset_t http_seek(URLContext *h, offset_t off, int whence)
320{
321 HTTPContext *s = h->priv_data;
322 URLContext *old_hd = s->hd;
323 offset_t old_off = s->off;
324
325 if (whence == AVSEEK_SIZE)
326 return s->filesize;
327 else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
328 return -1;
329
330 /* we save the old context in case the seek fails */
331 s->hd = NULL;
332 if (whence == SEEK_CUR)
333 off += s->off;
334 else if (whence == SEEK_END)
335 off += s->filesize;
336 s->off = off;
337
338 /* if it fails, continue on old connection */
339 if (http_open_cnx(h) < 0) {
340 s->hd = old_hd;
341 s->off = old_off;
342 return -1;
343 }
344 url_close(old_hd);
345 return off;
346}
347
348URLProtocol http_protocol = {
349 "http",
350 http_open,
351 http_read,
352 http_write,
353 http_seek,
354 http_close,
355};