http.c 12.3 KB
Newer Older
1 2
/*
 * HTTP protocol for ffmpeg client
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
21 22

#include "libavutil/avstring.h"
23 24
#include "avformat.h"
#include <unistd.h>
25
#include <strings.h>
26
#include "internal.h"
27
#include "network.h"
28
#include "os_support.h"
29
#include "httpauth.h"
30

Diego Biurrun's avatar
Diego Biurrun committed
31 32
/* XXX: POST protocol is not completely implemented because ffmpeg uses
   only a subset of it. */
33 34 35 36 37 38 39 40 41 42 43

/* used for protocol handling */
#define BUFFER_SIZE 1024
#define URL_SIZE    4096
#define MAX_REDIRECTS 8

typedef struct {
    URLContext *hd;
    unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
    int line_count;
    int http_code;
44
    int64_t chunksize;      /**< Used if "Transfer-Encoding: chunked" otherwise -1. */
45
    int64_t off, filesize;
46
    char location[URL_SIZE];
47
    HTTPAuthState auth_state;
48 49 50 51
} HTTPContext;

static int http_connect(URLContext *h, const char *path, const char *hoststr,
                        const char *auth, int *new_location);
52
static int http_write(URLContext *h, const uint8_t *buf, int size);
53 54 55 56 57 58 59 60 61 62 63


/* return non zero if error */
static int http_open_cnx(URLContext *h)
{
    const char *path, *proxy_path;
    char hostname[1024], hoststr[1024];
    char auth[1024];
    char path1[1024];
    char buf[1024];
    int port, use_proxy, err, location_changed = 0, redirects = 0;
64
    HTTPAuthType cur_auth_type;
65 66 67 68 69
    HTTPContext *s = h->priv_data;
    URLContext *hd = NULL;

    proxy_path = getenv("http_proxy");
    use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
70
        av_strstart(proxy_path, "http://", NULL);
71 72 73 74

    /* fill the dest addr */
 redo:
    /* needed in any case to build the host string */
75
    ff_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
Martin Storsjö's avatar
Martin Storsjö committed
76
                 path1, sizeof(path1), s->location);
77
    ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL);
78 79

    if (use_proxy) {
80
        ff_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
Martin Storsjö's avatar
Martin Storsjö committed
81
                     NULL, 0, proxy_path);
82 83 84 85 86 87 88 89 90 91
        path = s->location;
    } else {
        if (path1[0] == '\0')
            path = "/";
        else
            path = path1;
    }
    if (port < 0)
        port = 80;

92
    ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
93 94 95 96 97
    err = url_open(&hd, buf, URL_RDWR);
    if (err < 0)
        goto fail;

    s->hd = hd;
98
    cur_auth_type = s->auth_state.auth_type;
99 100
    if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
        goto fail;
101 102 103 104 105 106 107
    if (s->http_code == 401) {
        if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
            url_close(hd);
            goto redo;
        } else
            goto fail;
    }
108
    if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) {
109 110 111
        /* url moved, get next */
        url_close(hd);
        if (redirects++ >= MAX_REDIRECTS)
112
            return AVERROR(EIO);
113 114 115 116 117 118 119
        location_changed = 0;
        goto redo;
    }
    return 0;
 fail:
    if (hd)
        url_close(hd);
120
    return AVERROR(EIO);
121 122 123 124 125 126 127 128 129 130 131 132 133 134 135
}

static int http_open(URLContext *h, const char *uri, int flags)
{
    HTTPContext *s;
    int ret;

    h->is_streamed = 1;

    s = av_malloc(sizeof(HTTPContext));
    if (!s) {
        return AVERROR(ENOMEM);
    }
    h->priv_data = s;
    s->filesize = -1;
136
    s->chunksize = -1;
137
    s->off = 0;
138
    memset(&s->auth_state, 0, sizeof(s->auth_state));
139
    av_strlcpy(s->location, uri, URL_SIZE);
140 141 142 143 144 145 146 147 148 149 150 151

    ret = http_open_cnx(h);
    if (ret != 0)
        av_free (s);
    return ret;
}
static int http_getc(HTTPContext *s)
{
    int len;
    if (s->buf_ptr >= s->buf_end) {
        len = url_read(s->hd, s->buffer, BUFFER_SIZE);
        if (len < 0) {
152
            return AVERROR(EIO);
153 154 155 156 157 158 159 160 161 162
        } else if (len == 0) {
            return -1;
        } else {
            s->buf_ptr = s->buffer;
            s->buf_end = s->buffer + len;
        }
    }
    return *s->buf_ptr++;
}

163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186
static int http_get_line(HTTPContext *s, char *line, int line_size)
{
    int ch;
    char *q;

    q = line;
    for(;;) {
        ch = http_getc(s);
        if (ch < 0)
            return AVERROR(EIO);
        if (ch == '\n') {
            /* process line */
            if (q > line && q[-1] == '\r')
                q--;
            *q = '\0';

            return 0;
        } else {
            if ((q - line) < line_size - 1)
                *q++ = ch;
        }
    }
}

187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203
static int process_line(URLContext *h, char *line, int line_count,
                        int *new_location)
{
    HTTPContext *s = h->priv_data;
    char *tag, *p;

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

    p = line;
    if (line_count == 0) {
        while (!isspace(*p) && *p != '\0')
            p++;
        while (isspace(*p))
            p++;
        s->http_code = strtol(p, NULL, 10);
204 205 206

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

207 208 209
        /* error codes are 4xx and 5xx, but regard 401 as a success, so we
         * don't abort until all headers have been parsed. */
        if (s->http_code >= 400 && s->http_code < 600 && s->http_code != 401)
Alex Beregszaszi's avatar
Alex Beregszaszi committed
210
            return -1;
211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236
    } else {
        while (*p != '\0' && *p != ':')
            p++;
        if (*p != ':')
            return 1;

        *p = '\0';
        tag = line;
        p++;
        while (isspace(*p))
            p++;
        if (!strcmp(tag, "Location")) {
            strcpy(s->location, p);
            *new_location = 1;
        } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
            s->filesize = atoll(p);
        } else if (!strcmp (tag, "Content-Range")) {
            /* "bytes $from-$to/$document_size" */
            const char *slash;
            if (!strncmp (p, "bytes ", 6)) {
                p += 6;
                s->off = atoll(p);
                if ((slash = strchr(p, '/')) && strlen(slash) > 0)
                    s->filesize = atoll(slash+1);
            }
            h->is_streamed = 0; /* we _can_ in fact seek */
237 238 239
        } else if (!strcmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) {
            s->filesize = -1;
            s->chunksize = 0;
240 241 242 243
        } else if (!strcmp (tag, "WWW-Authenticate")) {
            ff_http_auth_handle_header(&s->auth_state, tag, p);
        } else if (!strcmp (tag, "Authentication-Info")) {
            ff_http_auth_handle_header(&s->auth_state, tag, p);
244 245 246 247 248 249 250 251 252
        }
    }
    return 1;
}

static int http_connect(URLContext *h, const char *path, const char *hoststr,
                        const char *auth, int *new_location)
{
    HTTPContext *s = h->priv_data;
253 254
    int post, err;
    char line[1024];
255
    char *authstr = NULL;
256
    int64_t off = s->off;
257 258 259 260


    /* send http header */
    post = h->flags & URL_WRONLY;
261 262
    authstr = ff_http_auth_create_response(&s->auth_state, auth, path,
                                        post ? "POST" : "GET");
263 264 265 266 267 268
    snprintf(s->buffer, sizeof(s->buffer),
             "%s %s HTTP/1.1\r\n"
             "User-Agent: %s\r\n"
             "Accept: */*\r\n"
             "Range: bytes=%"PRId64"-\r\n"
             "Host: %s\r\n"
269
             "%s"
Ronald S. Bultje's avatar
Ronald S. Bultje committed
270
             "Connection: close\r\n"
271
             "%s"
272 273 274 275 276 277
             "\r\n",
             post ? "POST" : "GET",
             path,
             LIBAVFORMAT_IDENT,
             s->off,
             hoststr,
278
             authstr ? authstr : "",
279
             post ? "Transfer-Encoding: chunked\r\n" : "");
280

281
    av_freep(&authstr);
282
    if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
283
        return AVERROR(EIO);
284 285 286 287 288 289

    /* init input buffer */
    s->buf_ptr = s->buffer;
    s->buf_end = s->buffer;
    s->line_count = 0;
    s->off = 0;
290
    s->filesize = -1;
291
    if (post) {
292 293
        /* always use chunked encoding for upload data */
        s->chunksize = 0;
294 295 296 297 298
        return 0;
    }

    /* wait for header */
    for(;;) {
299
        if (http_get_line(s, line, sizeof(line)) < 0)
300
            return AVERROR(EIO);
301 302 303

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

304 305 306 307 308 309
        err = process_line(h, line, s->line_count, new_location);
        if (err < 0)
            return err;
        if (err == 0)
            break;
        s->line_count++;
310 311 312 313 314 315 316 317 318 319 320
    }

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


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

321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341
    if (s->chunksize >= 0) {
        if (!s->chunksize) {
            char line[32];

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

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

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

                if (!s->chunksize)
                    return 0;
                break;
            }
        }
        size = FFMIN(size, s->chunksize);
    }
342 343 344 345 346 347 348 349 350 351
    /* read bytes from input buffer first */
    len = s->buf_end - s->buf_ptr;
    if (len > 0) {
        if (len > size)
            len = size;
        memcpy(buf, s->buf_ptr, len);
        s->buf_ptr += len;
    } else {
        len = url_read(s->hd, buf, size);
    }
352
    if (len > 0) {
353
        s->off += len;
354 355 356
        if (s->chunksize > 0)
            s->chunksize -= len;
    }
357 358 359 360
    return len;
}

/* used only when posting data */
361
static int http_write(URLContext *h, const uint8_t *buf, int size)
362
{
363 364 365
    char temp[11];  /* 32-bit hex + CRLF + nul */
    int ret;
    char crlf[] = "\r\n";
366
    HTTPContext *s = h->priv_data;
367 368 369

    if (s->chunksize == -1) {
        /* headers are sent without any special encoding */
Ronald S. Bultje's avatar
Ronald S. Bultje committed
370
        return url_write(s->hd, buf, size);
371 372 373 374 375 376 377 378 379 380 381 382 383 384
    }

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

        if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 ||
            (ret = url_write(s->hd, buf, size)) < 0 ||
            (ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
            return ret;
    }
    return size;
385 386 387 388
}

static int http_close(URLContext *h)
{
389 390
    int ret = 0;
    char footer[] = "0\r\n\r\n";
391
    HTTPContext *s = h->priv_data;
392 393 394 395 396 397 398

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

399 400
    url_close(s->hd);
    av_free(s);
401
    return ret;
402 403
}

404
static int64_t http_seek(URLContext *h, int64_t off, int whence)
405 406 407
{
    HTTPContext *s = h->priv_data;
    URLContext *old_hd = s->hd;
408
    int64_t old_off = s->off;
409 410
    uint8_t old_buf[BUFFER_SIZE];
    int old_buf_size;
411 412 413 414 415 416 417

    if (whence == AVSEEK_SIZE)
        return s->filesize;
    else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
        return -1;

    /* we save the old context in case the seek fails */
418 419
    old_buf_size = s->buf_end - s->buf_ptr;
    memcpy(old_buf, s->buf_ptr, old_buf_size);
420 421 422 423 424 425 426 427 428
    s->hd = NULL;
    if (whence == SEEK_CUR)
        off += s->off;
    else if (whence == SEEK_END)
        off += s->filesize;
    s->off = off;

    /* if it fails, continue on old connection */
    if (http_open_cnx(h) < 0) {
429 430 431
        memcpy(s->buffer, old_buf, old_buf_size);
        s->buf_ptr = s->buffer;
        s->buf_end = s->buffer + old_buf_size;
432 433 434 435 436 437 438 439
        s->hd = old_hd;
        s->off = old_off;
        return -1;
    }
    url_close(old_hd);
    return off;
}

440 441 442 443 444 445 446
static int
http_get_file_handle(URLContext *h)
{
    HTTPContext *s = h->priv_data;
    return url_get_file_handle(s->hd);
}

447 448 449 450 451 452 453
URLProtocol http_protocol = {
    "http",
    http_open,
    http_read,
    http_write,
    http_seek,
    http_close,
454
    .url_get_file_handle = http_get_file_handle,
455
};