libavformat/http.c

   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 <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <netinet/in.h>
  26 #ifndef __BEOS__
  27 # include <arpa/inet.h>
  28 #else
  29 # include "barpainet.h"
  30 #endif
  31 #include <netdb.h>
  32
  33 #include "base64.h"
  34
  35 /* XXX: POST protocol is not completly implemented because ffmpeg use
  36    only a subset of it */
  37
  38 //#define DEBUG
  39
  40 /* used for protocol handling */
  41 #define BUFFER_SIZE 1024
  42 #define URL_SIZE    4096
  43 #define MAX_REDIRECTS 8
  44
  45 typedef struct {
  46     URLContext *hd;
  47     unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
  48     int line_count;
  49     int http_code;
  50     offset_t off, filesize;
  51     char location[URL_SIZE];
  52 } HTTPContext;
  53
  54 static int http_connect(URLContext *h, const char *path, const char *hoststr,
  55                         const char *auth, int *new_location);
  56 static int http_write(URLContext *h, uint8_t *buf, int size);
  57
  58
  59 /* return non zero if error */
  60 static int http_open_cnx(URLContext *h)
  61 {
  62     const char *path, *proxy_path;
  63     char hostname[1024], hoststr[1024];
  64     char auth[1024];
  65     char path1[1024];
  66     char buf[1024];
  67     int port, use_proxy, err, location_changed = 0, redirects = 0;
  68     HTTPContext *s = h->priv_data;
  69     URLContext *hd = NULL;
  70
  71     proxy_path = getenv("http_proxy");
  72     use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
  73         strstart(proxy_path, "http://", NULL);
  74
  75     /* fill the dest addr */
  76  redo:
  77     /* needed in any case to build the host string */
  78     url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
  79               path1, sizeof(path1), s->location);
  80     if (port > 0) {
  81         snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
  82     } else {
  83         pstrcpy(hoststr, sizeof(hoststr), hostname);
  84     }
  85
  86     if (use_proxy) {
  87         url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
  88                   NULL, 0, proxy_path);
  89         path = s->location;
  90     } else {
  91         if (path1[0] == '\0')
  92             path = "/";
  93         else
  94             path = path1;
  95     }
  96     if (port < 0)
  97         port = 80;
  98
  99     snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
 100     err = url_open(&hd, buf, URL_RDWR);
 101     if (err < 0)
 102         goto fail;
 103
 104     s->hd = hd;
 105     if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
 106         goto fail;
 107     if (s->http_code == 303 && location_changed == 1) {
 108         /* url moved, get next */
 109         url_close(hd);
 110         if (redirects++ >= MAX_REDIRECTS)
 111             return AVERROR_IO;
 112         location_changed = 0;
 113         goto redo;
 114     }
 115     return 0;
 116  fail:
 117     if (hd)
 118         url_close(hd);
 119     return AVERROR_IO;
 120 }
 121
 122 static int http_open(URLContext *h, const char *uri, int flags)
 123 {
 124     HTTPContext *s;
 125     int ret;
 126
 127     h->is_streamed = 1;
 128
 129     s = av_malloc(sizeof(HTTPContext));
 130     if (!s) {
 131         return -ENOMEM;
 132     }
 133     h->priv_data = s;
 134     s->filesize = -1;
 135     s->off = 0;
 136     pstrcpy (s->location, URL_SIZE, uri);
 137
 138     ret = http_open_cnx(h);
 139     if (ret != 0)
 140         av_free (s);
 141     return ret;
 142 }
 143 static int http_getc(HTTPContext *s)
 144 {
 145     int len;
 146     if (s->buf_ptr >= s->buf_end) {
 147         len = url_read(s->hd, s->buffer, BUFFER_SIZE);
 148         if (len < 0) {
 149             return AVERROR_IO;
 150         } else if (len == 0) {
 151             return -1;
 152         } else {
 153             s->buf_ptr = s->buffer;
 154             s->buf_end = s->buffer + len;
 155         }
 156     }
 157     return *s->buf_ptr++;
 158 }
 159
 160 static int process_line(URLContext *h, char *line, int line_count,
 161                         int *new_location)
 162 {
 163     HTTPContext *s = h->priv_data;
 164     char *tag, *p;
 165
 166     /* end of header */
 167     if (line[0] == '\0')
 168         return 0;
 169
 170     p = line;
 171     if (line_count == 0) {
 172         while (!isspace(*p) && *p != '\0')
 173             p++;
 174         while (isspace(*p))
 175             p++;
 176         s->http_code = strtol(p, NULL, 10);
 177 #ifdef DEBUG
 178         printf("http_code=%d\n", s->http_code);
 179 #endif
 180     } else {
 181         while (*p != '\0' && *p != ':')
 182             p++;
 183         if (*p != ':')
 184             return 1;
 185
 186         *p = '\0';
 187         tag = line;
 188         p++;
 189         while (isspace(*p))
 190             p++;
 191         if (!strcmp(tag, "Location")) {
 192             strcpy(s->location, p);
 193             *new_location = 1;
 194         } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
 195             s->filesize = atoll(p);
 196         } else if (!strcmp (tag, "Content-Range")) {
 197             /* "bytes $from-$to/$document_size" */
 198             const char *slash;
 199             if (!strncmp (p, "bytes ", 6)) {
 200                 p += 6;
 201                 s->off = atoll(p);
 202                 if ((slash = strchr(p, '/')) && strlen(slash) > 0)
 203                     s->filesize = atoll(slash+1);
 204             }
 205             h->is_streamed = 0; /* we _can_ in fact seek */
 206         }
 207     }
 208     return 1;
 209 }
 210
 211 static int http_connect(URLContext *h, const char *path, const char *hoststr,
 212                         const char *auth, int *new_location)
 213 {
 214     HTTPContext *s = h->priv_data;
 215     int post, err, ch;
 216     char line[1024], *q;
 217     char *auth_b64;
 218     offset_t off = s->off;
 219
 220
 221     /* send http header */
 222     post = h->flags & URL_WRONLY;
 223
 224     auth_b64 = av_base64_encode((uint8_t *)auth, strlen(auth));
 225     snprintf(s->buffer, sizeof(s->buffer),
 226              "%s %s HTTP/1.1\r\n"
 227              "User-Agent: %s\r\n"
 228              "Accept: */*\r\n"
 229              "Range: bytes=%llu-\r\n"
 230              "Host: %s\r\n"
 231              "Authorization: Basic %s\r\n"
 232              "\r\n",
 233              post ? "POST" : "GET",
 234              path,
 235              LIBAVFORMAT_IDENT,
 236              s->off,
 237              hoststr,
 238              auth_b64);
 239
 240     av_freep(&auth_b64);
 241     if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
 242         return AVERROR_IO;
 243
 244     /* init input buffer */
 245     s->buf_ptr = s->buffer;
 246     s->buf_end = s->buffer;
 247     s->line_count = 0;
 248     s->off = 0;
 249     if (post) {
 250         sleep(1);
 251         return 0;
 252     }
 253
 254     /* wait for header */
 255     q = line;
 256     for(;;) {
 257         ch = http_getc(s);
 258         if (ch < 0)
 259             return AVERROR_IO;
 260         if (ch == '\n') {
 261             /* process line */
 262             if (q > line && q[-1] == '\r')
 263                 q--;
 264             *q = '\0';
 265 #ifdef DEBUG
 266             printf("header='%s'\n", line);
 267 #endif
 268             err = process_line(h, line, s->line_count, new_location);
 269             if (err < 0)
 270                 return err;
 271             if (err == 0)
 272                 break;
 273             s->line_count++;
 274             q = line;
 275         } else {
 276             if ((q - line) < sizeof(line) - 1)
 277                 *q++ = ch;
 278         }
 279     }
 280
 281     return (off == s->off) ? 0 : -1;
 282 }
 283
 284
 285 static int http_read(URLContext *h, uint8_t *buf, int size)
 286 {
 287     HTTPContext *s = h->priv_data;
 288     int len;
 289
 290     /* read bytes from input buffer first */
 291     len = s->buf_end - s->buf_ptr;
 292     if (len > 0) {
 293         if (len > size)
 294             len = size;
 295         memcpy(buf, s->buf_ptr, len);
 296         s->buf_ptr += len;
 297     } else {
 298         len = url_read(s->hd, buf, size);
 299     }
 300     if (len > 0)
 301         s->off += len;
 302     return len;
 303 }
 304
 305 /* used only when posting data */
 306 static int http_write(URLContext *h, uint8_t *buf, int size)
 307 {
 308     HTTPContext *s = h->priv_data;
 309     return url_write(s->hd, buf, size);
 310 }
 311
 312 static int http_close(URLContext *h)
 313 {
 314     HTTPContext *s = h->priv_data;
 315     url_close(s->hd);
 316     av_free(s);
 317     return 0;
 318 }
 319
 320 static offset_t http_seek(URLContext *h, offset_t off, int whence)
 321 {
 322     HTTPContext *s = h->priv_data;
 323     URLContext *old_hd = s->hd;
 324     offset_t old_off = s->off;
 325
 326     if (whence == AVSEEK_SIZE)
 327         return s->filesize;
 328     else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
 329         return -1;
 330
 331     /* we save the old context in case the seek fails */
 332     s->hd = NULL;
 333     if (whence == SEEK_CUR)
 334         off += s->off;
 335     else if (whence == SEEK_END)
 336         off += s->filesize;
 337     s->off = off;
 338
 339     /* if it fails, continue on old connection */
 340     if (http_open_cnx(h) < 0) {
 341         s->hd = old_hd;
 342         s->off = old_off;
 343         return -1;
 344     }
 345     url_close(old_hd);
 346     return off;
 347 }
 348
 349 URLProtocol http_protocol = {
 350     "http",
 351     http_open,
 352     http_read,
 353     http_write,
 354     http_seek,
 355     http_close,
 356 };