libav/http.c

   1 /*
   2  * HTTP protocol for ffmpeg client
   3  * Copyright (c) 2000, 2001 Fabrice Bellard.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include "avformat.h"
  20 #include <unistd.h>
  21 #include <ctype.h>
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netinet/in.h>
  25 #include <arpa/inet.h>
  26 #include <netdb.h>
  27
  28
  29 /* XXX: POST protocol is not completly implemented because ffmpeg use
  30    only a subset of it */
  31
  32 //#define DEBUG
  33
  34 /* used for protocol handling */
  35 #define BUFFER_SIZE 1024
  36 #define URL_SIZE    4096
  37
  38 typedef struct {
  39     URLContext *hd;
  40     unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
  41     int line_count;
  42     int http_code;
  43     char location[URL_SIZE];
  44 } HTTPContext;
  45
  46 static int http_connect(URLContext *h, const char *path, const char *hoststr);
  47 static int http_write(URLContext *h, UINT8 *buf, int size);
  48
  49
  50 /* return non zero if error */
  51 static int http_open(URLContext *h, const char *uri, int flags)
  52 {
  53     const char *path, *proxy_path;
  54     char hostname[1024], hoststr[1024];
  55     char path1[1024];
  56     char buf[1024];
  57     int port, use_proxy, err;
  58     HTTPContext *s;
  59     URLContext *hd = NULL;
  60
  61     h->is_streamed = 1;
  62
  63     s = av_malloc(sizeof(HTTPContext));
  64     if (!s) {
  65         return -ENOMEM;
  66     }
  67     h->priv_data = s;
  68
  69     proxy_path = getenv("http_proxy");
  70     use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
  71         strstart(proxy_path, "http://", NULL);
  72
  73     /* fill the dest addr */
  74  redo:
  75     /* needed in any case to build the host string */
  76     url_split(NULL, 0, hostname, sizeof(hostname), &port,
  77               path1, sizeof(path1), uri);
  78     if (port > 0) {
  79         snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
  80     } else {
  81         pstrcpy(hoststr, sizeof(hoststr), hostname);
  82     }
  83
  84     if (use_proxy) {
  85         url_split(NULL, 0, hostname, sizeof(hostname), &port,
  86                   NULL, 0, proxy_path);
  87         path = uri;
  88     } else {
  89         if (path1[0] == '\0')
  90             path = "/";
  91         else
  92             path = path1;
  93     }
  94     if (port < 0)
  95         port = 80;
  96
  97     snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
  98     err = url_open(&hd, buf, URL_RDWR);
  99     if (err < 0)
 100         goto fail;
 101
 102     s->hd = hd;
 103     if (http_connect(h, path, hoststr) < 0)
 104         goto fail;
 105     if (s->http_code == 303 && s->location[0] != '\0') {
 106         /* url moved, get next */
 107         uri = s->location;
 108         url_close(hd);
 109         goto redo;
 110     }
 111     return 0;
 112  fail:
 113     if (hd)
 114         url_close(hd);
 115     av_free(s);
 116     return -EIO;
 117 }
 118
 119 static int http_getc(HTTPContext *s)
 120 {
 121     int len;
 122     if (s->buf_ptr >= s->buf_end) {
 123         len = url_read(s->hd, s->buffer, BUFFER_SIZE);
 124         if (len < 0) {
 125             return -EIO;
 126         } else if (len == 0) {
 127             return -1;
 128         } else {
 129             s->buf_ptr = s->buffer;
 130             s->buf_end = s->buffer + len;
 131         }
 132     }
 133     return *s->buf_ptr++;
 134 }
 135
 136 static int process_line(HTTPContext *s, char *line, int line_count)
 137 {
 138     char *tag, *p;
 139
 140     /* end of header */
 141     if (line[0] == '\0')
 142         return 0;
 143
 144     p = line;
 145     if (line_count == 0) {
 146         while (!isspace(*p) && *p != '\0')
 147             p++;
 148         while (isspace(*p))
 149             p++;
 150         s->http_code = strtol(p, NULL, 10);
 151 #ifdef DEBUG
 152         printf("http_code=%d\n", s->http_code);
 153 #endif
 154     } else {
 155         while (*p != '\0' && *p != ':')
 156             p++;
 157         if (*p != ':')
 158             return 1;
 159
 160         *p = '\0';
 161         tag = line;
 162         p++;
 163         while (isspace(*p))
 164             p++;
 165         if (!strcmp(tag, "Location")) {
 166             strcpy(s->location, p);
 167         }
 168     }
 169     return 1;
 170 }
 171
 172 static int http_connect(URLContext *h, const char *path, const char *hoststr)
 173 {
 174     HTTPContext *s = h->priv_data;
 175     int post, err, ch;
 176     char line[1024], *q;
 177
 178
 179     /* send http header */
 180     post = h->flags & URL_WRONLY;
 181
 182     snprintf(s->buffer, sizeof(s->buffer),
 183              "%s %s HTTP/1.0\n"
 184              "User-Agent: FFmpeg %s\n"
 185              "Accept: */*\n"
 186              "Host: %s\n"
 187              "\n",
 188              post ? "POST" : "GET",
 189              path,
 190              FFMPEG_VERSION,
 191              hoststr);
 192
 193     if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
 194         return -EIO;
 195
 196     /* init input buffer */
 197     s->buf_ptr = s->buffer;
 198     s->buf_end = s->buffer;
 199     s->line_count = 0;
 200     s->location[0] = '\0';
 201     if (post) {
 202         sleep(1);
 203         return 0;
 204     }
 205
 206     /* wait for header */
 207     q = line;
 208     for(;;) {
 209         ch = http_getc(s);
 210         if (ch < 0)
 211             return -EIO;
 212         if (ch == '\n') {
 213             /* process line */
 214             if (q > line && q[-1] == '\r')
 215                 q--;
 216             *q = '\0';
 217 #ifdef DEBUG
 218             printf("header='%s'\n", line);
 219 #endif
 220             err = process_line(s, line, s->line_count);
 221             if (err < 0)
 222                 return err;
 223             if (err == 0)
 224                 return 0;
 225             s->line_count++;
 226             q = line;
 227         } else {
 228             if ((q - line) < sizeof(line) - 1)
 229                 *q++ = ch;
 230         }
 231     }
 232 }
 233
 234
 235 static int http_read(URLContext *h, UINT8 *buf, int size)
 236 {
 237     HTTPContext *s = h->priv_data;
 238     int size1, len;
 239
 240     size1 = size;
 241     while (size > 0) {
 242         /* read bytes from input buffer first */
 243         len = s->buf_end - s->buf_ptr;
 244         if (len > 0) {
 245             if (len > size)
 246                 len = size;
 247             memcpy(buf, s->buf_ptr, len);
 248             s->buf_ptr += len;
 249         } else {
 250             len = url_read (s->hd, buf, size);
 251             if (len < 0) {
 252                 return len;
 253             } else if (len == 0) {
 254                 break;
 255             }
 256         }
 257         size -= len;
 258         buf += len;
 259     }
 260     return size1 - size;
 261 }
 262
 263 /* used only when posting data */
 264 static int http_write(URLContext *h, UINT8 *buf, int size)
 265 {
 266     HTTPContext *s = h->priv_data;
 267     return url_write(s->hd, buf, size);
 268 }
 269
 270 static int http_close(URLContext *h)
 271 {
 272     HTTPContext *s = h->priv_data;
 273     url_close(s->hd);
 274     av_free(s);
 275     return 0;
 276 }
 277
 278 URLProtocol http_protocol = {
 279     "http",
 280     http_open,
 281     http_read,
 282     http_write,
 283     NULL, /* seek */
 284     http_close,
 285 };
 286