Statistics
| Branch: | Revision:

ffmpeg / libavformat / http.c @ 6ed04040

History | View | Annotate | Download (15 KB)

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 <unistd.h>
25
#include <strings.h>
26
#include "internal.h"
27
#include "network.h"
28
#include "http.h"
29
#include "os_support.h"
30
#include "httpauth.h"
31
#include "libavutil/opt.h"
32

    
33
/* XXX: POST protocol is not completely implemented because ffmpeg uses
34
   only a subset of it. */
35

    
36
/* used for protocol handling */
37
#define BUFFER_SIZE 1024
38
#define MAX_REDIRECTS 8
39

    
40
typedef struct {
41
    const AVClass *class;
42
    URLContext *hd;
43
    unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
44
    int line_count;
45
    int http_code;
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
    unsigned char headers[BUFFER_SIZE];
51
    int willclose;          /**< Set if the server correctly handles Connection: close and will close the connection after feeding us the content. */
52
} HTTPContext;
53

    
54
#define OFFSET(x) offsetof(HTTPContext, x)
55
static const AVOption options[] = {
56
{"chunksize", "use chunked transfer-encoding for posts, -1 disables it, 0 enables it", OFFSET(chunksize), FF_OPT_TYPE_INT64, 0, -1, 0 }, /* Default to 0, for chunked POSTs */
57
{NULL}
58
};
59
static const AVClass httpcontext_class = {
60
    "HTTP", av_default_item_name, options, LIBAVUTIL_VERSION_INT
61
};
62

    
63
static int http_connect(URLContext *h, const char *path, const char *hoststr,
64
                        const char *auth, int *new_location);
65

    
66
void ff_http_set_headers(URLContext *h, const char *headers)
67
{
68
    HTTPContext *s = h->priv_data;
69
    int len = strlen(headers);
70

    
71
    if (len && strcmp("\r\n", headers + len - 2))
72
        av_log(NULL, AV_LOG_ERROR, "No trailing CRLF found in HTTP header.\n");
73

    
74
    av_strlcpy(s->headers, headers, sizeof(s->headers));
75
}
76

    
77
void ff_http_set_chunked_transfer_encoding(URLContext *h, int is_chunked)
78
{
79
    ((HTTPContext*)h->priv_data)->chunksize = is_chunked ? 0 : -1;
80
}
81

    
82
void ff_http_init_auth_state(URLContext *dest, const URLContext *src)
83
{
84
    memcpy(&((HTTPContext*)dest->priv_data)->auth_state,
85
           &((HTTPContext*)src->priv_data)->auth_state, sizeof(HTTPAuthState));
86
}
87

    
88
/* return non zero if error */
89
static int http_open_cnx(URLContext *h)
90
{
91
    const char *path, *proxy_path;
92
    char hostname[1024], hoststr[1024];
93
    char auth[1024];
94
    char path1[1024];
95
    char buf[1024];
96
    int port, use_proxy, err, location_changed = 0, redirects = 0;
97
    HTTPAuthType cur_auth_type;
98
    HTTPContext *s = h->priv_data;
99
    URLContext *hd = NULL;
100

    
101
    proxy_path = getenv("http_proxy");
102
    use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
103
        av_strstart(proxy_path, "http://", NULL);
104

    
105
    /* fill the dest addr */
106
 redo:
107
    /* needed in any case to build the host string */
108
    av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
109
                 path1, sizeof(path1), s->location);
110
    ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
111

    
112
    if (use_proxy) {
113
        av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
114
                     NULL, 0, proxy_path);
115
        path = s->location;
116
    } else {
117
        if (path1[0] == '\0')
118
            path = "/";
119
        else
120
            path = path1;
121
    }
122
    if (port < 0)
123
        port = 80;
124

    
125
    ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
126
    err = url_open(&hd, buf, URL_RDWR);
127
    if (err < 0)
128
        goto fail;
129

    
130
    s->hd = hd;
131
    cur_auth_type = s->auth_state.auth_type;
132
    if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
133
        goto fail;
134
    if (s->http_code == 401) {
135
        if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
136
            url_close(hd);
137
            goto redo;
138
        } else
139
            goto fail;
140
    }
141
    if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) {
142
        /* url moved, get next */
143
        url_close(hd);
144
        if (redirects++ >= MAX_REDIRECTS)
145
            return AVERROR(EIO);
146
        location_changed = 0;
147
        goto redo;
148
    }
149
    return 0;
150
 fail:
151
    if (hd)
152
        url_close(hd);
153
    s->hd = NULL;
154
    return AVERROR(EIO);
155
}
156

    
157
static int http_open(URLContext *h, const char *uri, int flags)
158
{
159
    HTTPContext *s = h->priv_data;
160

    
161
    h->is_streamed = 1;
162

    
163
    s->filesize = -1;
164
    av_strlcpy(s->location, uri, sizeof(s->location));
165

    
166
    return http_open_cnx(h);
167
}
168
static int http_getc(HTTPContext *s)
169
{
170
    int len;
171
    if (s->buf_ptr >= s->buf_end) {
172
        len = url_read(s->hd, s->buffer, BUFFER_SIZE);
173
        if (len < 0) {
174
            return AVERROR(EIO);
175
        } else if (len == 0) {
176
            return -1;
177
        } else {
178
            s->buf_ptr = s->buffer;
179
            s->buf_end = s->buffer + len;
180
        }
181
    }
182
    return *s->buf_ptr++;
183
}
184

    
185
static int http_get_line(HTTPContext *s, char *line, int line_size)
186
{
187
    int ch;
188
    char *q;
189

    
190
    q = line;
191
    for(;;) {
192
        ch = http_getc(s);
193
        if (ch < 0)
194
            return AVERROR(EIO);
195
        if (ch == '\n') {
196
            /* process line */
197
            if (q > line && q[-1] == '\r')
198
                q--;
199
            *q = '\0';
200

    
201
            return 0;
202
        } else {
203
            if ((q - line) < line_size - 1)
204
                *q++ = ch;
205
        }
206
    }
207
}
208

    
209
static int process_line(URLContext *h, char *line, int line_count,
210
                        int *new_location)
211
{
212
    HTTPContext *s = h->priv_data;
213
    char *tag, *p, *end;
214

    
215
    /* end of header */
216
    if (line[0] == '\0')
217
        return 0;
218

    
219
    p = line;
220
    if (line_count == 0) {
221
        while (!isspace(*p) && *p != '\0')
222
            p++;
223
        while (isspace(*p))
224
            p++;
225
        s->http_code = strtol(p, &end, 10);
226

    
227
        dprintf(NULL, "http_code=%d\n", s->http_code);
228

    
229
        /* error codes are 4xx and 5xx, but regard 401 as a success, so we
230
         * don't abort until all headers have been parsed. */
231
        if (s->http_code >= 400 && s->http_code < 600 && s->http_code != 401) {
232
            end += strspn(end, SPACE_CHARS);
233
            av_log(NULL, AV_LOG_WARNING, "HTTP error %d %s\n",
234
                   s->http_code, end);
235
            return -1;
236
        }
237
    } else {
238
        while (*p != '\0' && *p != ':')
239
            p++;
240
        if (*p != ':')
241
            return 1;
242

    
243
        *p = '\0';
244
        tag = line;
245
        p++;
246
        while (isspace(*p))
247
            p++;
248
        if (!strcmp(tag, "Location")) {
249
            strcpy(s->location, p);
250
            *new_location = 1;
251
        } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
252
            s->filesize = atoll(p);
253
        } else if (!strcmp (tag, "Content-Range")) {
254
            /* "bytes $from-$to/$document_size" */
255
            const char *slash;
256
            if (!strncmp (p, "bytes ", 6)) {
257
                p += 6;
258
                s->off = atoll(p);
259
                if ((slash = strchr(p, '/')) && strlen(slash) > 0)
260
                    s->filesize = atoll(slash+1);
261
            }
262
            h->is_streamed = 0; /* we _can_ in fact seek */
263
        } else if (!strcmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) {
264
            s->filesize = -1;
265
            s->chunksize = 0;
266
        } else if (!strcmp (tag, "WWW-Authenticate")) {
267
            ff_http_auth_handle_header(&s->auth_state, tag, p);
268
        } else if (!strcmp (tag, "Authentication-Info")) {
269
            ff_http_auth_handle_header(&s->auth_state, tag, p);
270
        } else if (!strcmp (tag, "Connection")) {
271
            if (!strcmp(p, "close"))
272
                s->willclose = 1;
273
        }
274
    }
275
    return 1;
276
}
277

    
278
static inline int has_header(const char *str, const char *header)
279
{
280
    /* header + 2 to skip over CRLF prefix. (make sure you have one!) */
281
    return av_stristart(str, header + 2, NULL) || av_stristr(str, header);
282
}
283

    
284
static int http_connect(URLContext *h, const char *path, const char *hoststr,
285
                        const char *auth, int *new_location)
286
{
287
    HTTPContext *s = h->priv_data;
288
    int post, err;
289
    char line[1024];
290
    char headers[1024] = "";
291
    char *authstr = NULL;
292
    int64_t off = s->off;
293
    int len = 0;
294

    
295

    
296
    /* send http header */
297
    post = h->flags & URL_WRONLY;
298
    authstr = ff_http_auth_create_response(&s->auth_state, auth, path,
299
                                        post ? "POST" : "GET");
300

    
301
    /* set default headers if needed */
302
    if (!has_header(s->headers, "\r\nUser-Agent: "))
303
       len += av_strlcatf(headers + len, sizeof(headers) - len,
304
                          "User-Agent: %s\r\n", LIBAVFORMAT_IDENT);
305
    if (!has_header(s->headers, "\r\nAccept: "))
306
        len += av_strlcpy(headers + len, "Accept: */*\r\n",
307
                          sizeof(headers) - len);
308
    if (!has_header(s->headers, "\r\nRange: "))
309
        len += av_strlcatf(headers + len, sizeof(headers) - len,
310
                           "Range: bytes=%"PRId64"-\r\n", s->off);
311
    if (!has_header(s->headers, "\r\nConnection: "))
312
        len += av_strlcpy(headers + len, "Connection: close\r\n",
313
                          sizeof(headers)-len);
314
    if (!has_header(s->headers, "\r\nHost: "))
315
        len += av_strlcatf(headers + len, sizeof(headers) - len,
316
                           "Host: %s\r\n", hoststr);
317

    
318
    /* now add in custom headers */
319
    av_strlcpy(headers+len, s->headers, sizeof(headers)-len);
320

    
321
    snprintf(s->buffer, sizeof(s->buffer),
322
             "%s %s HTTP/1.1\r\n"
323
             "%s"
324
             "%s"
325
             "%s"
326
             "\r\n",
327
             post ? "POST" : "GET",
328
             path,
329
             post && s->chunksize >= 0 ? "Transfer-Encoding: chunked\r\n" : "",
330
             headers,
331
             authstr ? authstr : "");
332

    
333
    av_freep(&authstr);
334
    if (url_write(s->hd, s->buffer, strlen(s->buffer)) < 0)
335
        return AVERROR(EIO);
336

    
337
    /* init input buffer */
338
    s->buf_ptr = s->buffer;
339
    s->buf_end = s->buffer;
340
    s->line_count = 0;
341
    s->off = 0;
342
    s->filesize = -1;
343
    s->willclose = 0;
344
    if (post) {
345
        /* Pretend that it did work. We didn't read any header yet, since
346
         * we've still to send the POST data, but the code calling this
347
         * function will check http_code after we return. */
348
        s->http_code = 200;
349
        return 0;
350
    }
351
    s->chunksize = -1;
352

    
353
    /* wait for header */
354
    for(;;) {
355
        if (http_get_line(s, line, sizeof(line)) < 0)
356
            return AVERROR(EIO);
357

    
358
        dprintf(NULL, "header='%s'\n", line);
359

    
360
        err = process_line(h, line, s->line_count, new_location);
361
        if (err < 0)
362
            return err;
363
        if (err == 0)
364
            break;
365
        s->line_count++;
366
    }
367

    
368
    return (off == s->off) ? 0 : -1;
369
}
370

    
371

    
372
static int http_read(URLContext *h, uint8_t *buf, int size)
373
{
374
    HTTPContext *s = h->priv_data;
375
    int len;
376

    
377
    if (s->chunksize >= 0) {
378
        if (!s->chunksize) {
379
            char line[32];
380

    
381
            for(;;) {
382
                do {
383
                    if (http_get_line(s, line, sizeof(line)) < 0)
384
                        return AVERROR(EIO);
385
                } while (!*line);    /* skip CR LF from last chunk */
386

    
387
                s->chunksize = strtoll(line, NULL, 16);
388

    
389
                dprintf(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
390

    
391
                if (!s->chunksize)
392
                    return 0;
393
                break;
394
            }
395
        }
396
        size = FFMIN(size, s->chunksize);
397
    }
398
    /* read bytes from input buffer first */
399
    len = s->buf_end - s->buf_ptr;
400
    if (len > 0) {
401
        if (len > size)
402
            len = size;
403
        memcpy(buf, s->buf_ptr, len);
404
        s->buf_ptr += len;
405
    } else {
406
        if (!s->willclose && s->filesize >= 0 && s->off >= s->filesize)
407
            return AVERROR_EOF;
408
        len = url_read(s->hd, buf, size);
409
    }
410
    if (len > 0) {
411
        s->off += len;
412
        if (s->chunksize > 0)
413
            s->chunksize -= len;
414
    }
415
    return len;
416
}
417

    
418
/* used only when posting data */
419
static int http_write(URLContext *h, const uint8_t *buf, int size)
420
{
421
    char temp[11] = "";  /* 32-bit hex + CRLF + nul */
422
    int ret;
423
    char crlf[] = "\r\n";
424
    HTTPContext *s = h->priv_data;
425

    
426
    if (s->chunksize == -1) {
427
        /* non-chunked data is sent without any special encoding */
428
        return url_write(s->hd, buf, size);
429
    }
430

    
431
    /* silently ignore zero-size data since chunk encoding that would
432
     * signal EOF */
433
    if (size > 0) {
434
        /* upload data using chunked encoding */
435
        snprintf(temp, sizeof(temp), "%x\r\n", size);
436

    
437
        if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 ||
438
            (ret = url_write(s->hd, buf, size)) < 0 ||
439
            (ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
440
            return ret;
441
    }
442
    return size;
443
}
444

    
445
static int http_close(URLContext *h)
446
{
447
    int ret = 0;
448
    char footer[] = "0\r\n\r\n";
449
    HTTPContext *s = h->priv_data;
450

    
451
    /* signal end of chunked encoding if used */
452
    if ((h->flags & URL_WRONLY) && s->chunksize != -1) {
453
        ret = url_write(s->hd, footer, sizeof(footer) - 1);
454
        ret = ret > 0 ? 0 : ret;
455
    }
456

    
457
    if (s->hd)
458
        url_close(s->hd);
459
    return ret;
460
}
461

    
462
static int64_t http_seek(URLContext *h, int64_t off, int whence)
463
{
464
    HTTPContext *s = h->priv_data;
465
    URLContext *old_hd = s->hd;
466
    int64_t old_off = s->off;
467
    uint8_t old_buf[BUFFER_SIZE];
468
    int old_buf_size;
469

    
470
    if (whence == AVSEEK_SIZE)
471
        return s->filesize;
472
    else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
473
        return -1;
474

    
475
    /* we save the old context in case the seek fails */
476
    old_buf_size = s->buf_end - s->buf_ptr;
477
    memcpy(old_buf, s->buf_ptr, old_buf_size);
478
    s->hd = NULL;
479
    if (whence == SEEK_CUR)
480
        off += s->off;
481
    else if (whence == SEEK_END)
482
        off += s->filesize;
483
    s->off = off;
484

    
485
    /* if it fails, continue on old connection */
486
    if (http_open_cnx(h) < 0) {
487
        memcpy(s->buffer, old_buf, old_buf_size);
488
        s->buf_ptr = s->buffer;
489
        s->buf_end = s->buffer + old_buf_size;
490
        s->hd = old_hd;
491
        s->off = old_off;
492
        return -1;
493
    }
494
    url_close(old_hd);
495
    return off;
496
}
497

    
498
static int
499
http_get_file_handle(URLContext *h)
500
{
501
    HTTPContext *s = h->priv_data;
502
    return url_get_file_handle(s->hd);
503
}
504

    
505
URLProtocol http_protocol = {
506
    "http",
507
    http_open,
508
    http_read,
509
    http_write,
510
    http_seek,
511
    http_close,
512
    .url_get_file_handle = http_get_file_handle,
513
    .priv_data_size = sizeof(HTTPContext),
514
    .priv_data_class = &httpcontext_class,
515
};