libavformat/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 #ifndef __BEOS__
  26 # include <arpa/inet.h>
  27 #else
  28 # include "barpainet.h"
  29 #endif
  30 #include <netdb.h>
  31
  32
  33 /* XXX: POST protocol is not completly implemented because ffmpeg use
  34    only a subset of it */
  35
  36 //#define DEBUG
  37
  38 /* used for protocol handling */
  39 #define BUFFER_SIZE 1024
  40 #define URL_SIZE    4096
  41
  42 typedef struct {
  43     URLContext *hd;
  44     unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
  45     int line_count;
  46     int http_code;
  47     char location[URL_SIZE];
  48 } HTTPContext;
  49
  50 static int http_connect(URLContext *h, const char *path, const char *hoststr);
  51 static int http_write(URLContext *h, uint8_t *buf, int size);
  52
  53
  54 /* return non zero if error */
  55 static int http_open(URLContext *h, const char *uri, int flags)
  56 {
  57     const char *path, *proxy_path;
  58     char hostname[1024], hoststr[1024];
  59     char path1[1024];
  60     char buf[1024];
  61     int port, use_proxy, err;
  62     HTTPContext *s;
  63     URLContext *hd = NULL;
  64
  65     h->is_streamed = 1;
  66
  67     s = av_malloc(sizeof(HTTPContext));
  68     if (!s) {
  69         return -ENOMEM;
  70     }
  71     h->priv_data = s;
  72
  73     proxy_path = getenv("http_proxy");
  74     use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
  75         strstart(proxy_path, "http://", NULL);
  76
  77     /* fill the dest addr */
  78  redo:
  79     /* needed in any case to build the host string */
  80     url_split(NULL, 0, hostname, sizeof(hostname), &port,
  81               path1, sizeof(path1), uri);
  82     if (port > 0) {
  83         snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
  84     } else {
  85         pstrcpy(hoststr, sizeof(hoststr), hostname);
  86     }
  87
  88     if (use_proxy) {
  89         url_split(NULL, 0, hostname, sizeof(hostname), &port,
  90                   NULL, 0, proxy_path);
  91         path = uri;
  92     } else {
  93         if (path1[0] == '\0')
  94             path = "/";
  95         else
  96             path = path1;
  97     }
  98     if (port < 0)
  99         port = 80;
 100
 101     snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
 102     err = url_open(&hd, buf, URL_RDWR);
 103     if (err < 0)
 104         goto fail;
 105
 106     s->hd = hd;
 107     if (http_connect(h, path, hoststr) < 0)
 108         goto fail;
 109     if (s->http_code == 303 && s->location[0] != '\0') {
 110         /* url moved, get next */
 111         uri = s->location;
 112         url_close(hd);
 113         goto redo;
 114     }
 115     return 0;
 116  fail:
 117     if (hd)
 118         url_close(hd);
 119     av_free(s);
 120     return -EIO;
 121 }
 122
 123 static int http_getc(HTTPContext *s)
 124 {
 125     int len;
 126     if (s->buf_ptr >= s->buf_end) {
 127         len = url_read(s->hd, s->buffer, BUFFER_SIZE);
 128         if (len < 0) {
 129             return -EIO;
 130         } else if (len == 0) {
 131             return -1;
 132         } else {
 133             s->buf_ptr = s->buffer;
 134             s->buf_end = s->buffer + len;
 135         }
 136     }
 137     return *s->buf_ptr++;
 138 }
 139
 140 static int process_line(HTTPContext *s, char *line, int line_count)
 141 {
 142     char *tag, *p;
 143
 144     /* end of header */
 145     if (line[0] == '\0')
 146         return 0;
 147
 148     p = line;
 149     if (line_count == 0) {
 150         while (!isspace(*p) && *p != '\0')
 151             p++;
 152         while (isspace(*p))
 153             p++;
 154         s->http_code = strtol(p, NULL, 10);
 155 #ifdef DEBUG
 156         printf("http_code=%d\n", s->http_code);
 157 #endif
 158     } else {
 159         while (*p != '\0' && *p != ':')
 160             p++;
 161         if (*p != ':')
 162             return 1;
 163
 164         *p = '\0';
 165         tag = line;
 166         p++;
 167         while (isspace(*p))
 168             p++;
 169         if (!strcmp(tag, "Location")) {
 170             strcpy(s->location, p);
 171         }
 172     }
 173     return 1;
 174 }
 175
 176 static int http_connect(URLContext *h, const char *path, const char *hoststr)
 177 {
 178     HTTPContext *s = h->priv_data;
 179     int post, err, ch;
 180     char line[1024], *q;
 181
 182
 183     /* send http header */
 184     post = h->flags & URL_WRONLY;
 185
 186     snprintf(s->buffer, sizeof(s->buffer),
 187              "%s %s HTTP/1.0\n"
 188              "User-Agent: FFmpeg %s\n"
 189              "Accept: */*\n"
 190              "Host: %s\n"
 191              "\n",
 192              post ? "POST" : "GET",
 193              path,
 194              LIBAVFORMAT_VERSION,
 195              hoststr);
 196
 197     if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
 198         return -EIO;
 199
 200     /* init input buffer */
 201     s->buf_ptr = s->buffer;
 202     s->buf_end = s->buffer;
 203     s->line_count = 0;
 204     s->location[0] = '\0';
 205     if (post) {
 206         sleep(1);
 207         return 0;
 208     }
 209
 210     /* wait for header */
 211     q = line;
 212     for(;;) {
 213         ch = http_getc(s);
 214         if (ch < 0)
 215             return -EIO;
 216         if (ch == '\n') {
 217             /* process line */
 218             if (q > line && q[-1] == '\r')
 219                 q--;
 220             *q = '\0';
 221 #ifdef DEBUG
 222             printf("header='%s'\n", line);
 223 #endif
 224             err = process_line(s, line, s->line_count);
 225             if (err < 0)
 226                 return err;
 227             if (err == 0)
 228                 return 0;
 229             s->line_count++;
 230             q = line;
 231         } else {
 232             if ((q - line) < sizeof(line) - 1)
 233                 *q++ = ch;
 234         }
 235     }
 236 }
 237
 238
 239 static int http_read(URLContext *h, uint8_t *buf, int size)
 240 {
 241     HTTPContext *s = h->priv_data;
 242     int size1, len;
 243
 244     size1 = size;
 245     while (size > 0) {
 246         /* read bytes from input buffer first */
 247         len = s->buf_end - s->buf_ptr;
 248         if (len > 0) {
 249             if (len > size)
 250                 len = size;
 251             memcpy(buf, s->buf_ptr, len);
 252             s->buf_ptr += len;
 253         } else {
 254             len = url_read (s->hd, buf, size);
 255             if (len < 0) {
 256                 return len;
 257             } else if (len == 0) {
 258                 break;
 259             }
 260         }
 261         size -= len;
 262         buf += len;
 263     }
 264     return size1 - size;
 265 }
 266
 267 /* used only when posting data */
 268 static int http_write(URLContext *h, uint8_t *buf, int size)
 269 {
 270     HTTPContext *s = h->priv_data;
 271     return url_write(s->hd, buf, size);
 272 }
 273
 274 static int http_close(URLContext *h)
 275 {
 276     HTTPContext *s = h->priv_data;
 277     url_close(s->hd);
 278     av_free(s);
 279     return 0;
 280 }
 281
 282 URLProtocol http_protocol = {
 283     "http",
 284     http_open,
 285     http_read,
 286     http_write,
 287     NULL, /* seek */
 288     http_close,
 289 };
 290