http.c 9.44 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 23

#include "libavutil/base64.h"
#include "libavutil/avstring.h"
24 25 26
#include "avformat.h"
#include <unistd.h>
#include "network.h"
27
#include "os_support.h"
28

Diego Biurrun's avatar
Diego Biurrun committed
29 30
/* XXX: POST protocol is not completely implemented because ffmpeg uses
   only a subset of it. */
31 32 33 34 35 36 37 38 39 40 41 42 43

//#define DEBUG

/* 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 off, filesize;
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
    char location[URL_SIZE];
} HTTPContext;

static int http_connect(URLContext *h, const char *path, const char *hoststr,
                        const char *auth, int *new_location);
static int http_write(URLContext *h, uint8_t *buf, int size);


/* 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;
    HTTPContext *s = h->priv_data;
    URLContext *hd = NULL;

    proxy_path = getenv("http_proxy");
    use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
67
        av_strstart(proxy_path, "http://", NULL);
68 69 70 71 72 73 74 75 76

    /* fill the dest addr */
 redo:
    /* needed in any case to build the host string */
    url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
              path1, sizeof(path1), s->location);
    if (port > 0) {
        snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
    } else {
Måns Rullgård's avatar
Måns Rullgård committed
77
        av_strlcpy(hoststr, hostname, sizeof(hoststr));
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
    }

    if (use_proxy) {
        url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
                  NULL, 0, proxy_path);
        path = s->location;
    } else {
        if (path1[0] == '\0')
            path = "/";
        else
            path = path1;
    }
    if (port < 0)
        port = 80;

    snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
    err = url_open(&hd, buf, URL_RDWR);
    if (err < 0)
        goto fail;

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

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;
    s->off = 0;
130
    av_strlcpy(s->location, uri, URL_SIZE);
131 132 133 134 135 136 137 138 139 140 141 142

    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) {
143
            return AVERROR(EIO);
144 145 146 147 148 149 150 151 152 153
        } else if (len == 0) {
            return -1;
        } else {
            s->buf_ptr = s->buffer;
            s->buf_end = s->buffer + len;
        }
    }
    return *s->buf_ptr++;
}

154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177
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;
        }
    }
}

178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
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);
#ifdef DEBUG
        printf("http_code=%d\n", s->http_code);
#endif
Alex Beregszaszi's avatar
Alex Beregszaszi committed
198 199 200
        /* error codes are 4xx and 5xx */
        if (s->http_code >= 400 && s->http_code < 600)
            return -1;
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235
    } 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 */
        }
    }
    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;
236 237
    int post, err;
    char line[1024];
238
    char *auth_b64;
239
    int auth_b64_len = (strlen(auth) + 2) / 3 * 4 + 1;
240
    int64_t off = s->off;
241 242 243 244


    /* send http header */
    post = h->flags & URL_WRONLY;
245
    auth_b64 = av_malloc(auth_b64_len);
Reimar Döffinger's avatar
Reimar Döffinger committed
246
    av_base64_encode(auth_b64, auth_b64_len, auth, strlen(auth));
247 248 249 250 251 252 253
    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"
             "Authorization: Basic %s\r\n"
Ronald S. Bultje's avatar
Ronald S. Bultje committed
254
             "Connection: close\r\n"
255 256 257 258 259 260 261 262 263 264
             "\r\n",
             post ? "POST" : "GET",
             path,
             LIBAVFORMAT_IDENT,
             s->off,
             hoststr,
             auth_b64);

    av_freep(&auth_b64);
    if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
265
        return AVERROR(EIO);
266 267 268 269 270 271

    /* init input buffer */
    s->buf_ptr = s->buffer;
    s->buf_end = s->buffer;
    s->line_count = 0;
    s->off = 0;
272
    s->filesize = -1;
273 274 275 276 277 278
    if (post) {
        return 0;
    }

    /* wait for header */
    for(;;) {
279
        if (http_get_line(s, line, sizeof(line)) < 0)
280
            return AVERROR(EIO);
281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330
#ifdef DEBUG
            printf("header='%s'\n", line);
#endif
            err = process_line(h, line, s->line_count, new_location);
            if (err < 0)
                return err;
            if (err == 0)
                break;
            s->line_count++;
    }

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


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

    /* 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);
    }
    if (len > 0)
        s->off += len;
    return len;
}

/* used only when posting data */
static int http_write(URLContext *h, uint8_t *buf, int size)
{
    HTTPContext *s = h->priv_data;
    return url_write(s->hd, buf, size);
}

static int http_close(URLContext *h)
{
    HTTPContext *s = h->priv_data;
    url_close(s->hd);
    av_free(s);
    return 0;
}

331
static int64_t http_seek(URLContext *h, int64_t off, int whence)
332 333 334
{
    HTTPContext *s = h->priv_data;
    URLContext *old_hd = s->hd;
335
    int64_t old_off = s->off;
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359

    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 */
    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) {
        s->hd = old_hd;
        s->off = old_off;
        return -1;
    }
    url_close(old_hd);
    return off;
}

360 361 362 363 364 365 366
static int
http_get_file_handle(URLContext *h)
{
    HTTPContext *s = h->priv_data;
    return url_get_file_handle(s->hd);
}

367 368 369 370 371 372 373
URLProtocol http_protocol = {
    "http",
    http_open,
    http_read,
    http_write,
    http_seek,
    http_close,
374
    .url_get_file_handle = http_get_file_handle,
375
};