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 22#include "libavutil/avstring.h" 23#include "avformat.h" 24#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 31/* XXX: POST protocol is not completely implemented because ffmpeg uses 32 only a subset of it. */ 33 34/* used for protocol handling */ 35#define BUFFER_SIZE 1024 36#define URL_SIZE 4096 37#define MAX_REDIRECTS 8 38 39typedef struct { 40 URLContext *hd; 41 unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end; 42 int line_count; 43 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} HTTPContext; 49 50static int http_connect(URLContext *h, const char *path, const char *hoststr, 51 const char *auth, int *new_location); 52static int http_write(URLContext *h, uint8_t *buf, int size); 53 54 55/* return non zero if error */ 56static int http_open_cnx(URLContext *h) 57{ 58 const char *path, *proxy_path; 59 char hostname[1024], hoststr[1024]; 60 char auth[1024]; 61 char path1[1024]; 62 char buf[1024]; 63 int port, use_proxy, err, location_changed = 0, redirects = 0; 64 HTTPAuthType cur_auth_type; 65 HTTPContext *s = h->priv_data; 66 URLContext *hd = NULL; 67 68 proxy_path = getenv("http_proxy"); 69 use_proxy = (proxy_path != NULL) && !getenv("no_proxy") && 70 av_strstart(proxy_path, "http://", NULL); 71 72 /* fill the dest addr */ 73 redo: 74 /* needed in any case to build the host string */ 75 ff_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port, 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, 81 NULL, 0, proxy_path); 82 path = s->location; 83 } else { 84 if (path1[0] == '\0') 85 path = "/"; 86 else 87 path = path1; 88 } 89 if (port < 0) 90 port = 80; 91 92 ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL); 93 err = url_open(&hd, buf, URL_RDWR); 94 if (err < 0) 95 goto fail; 96 97 s->hd = hd; 98 cur_auth_type = s->auth_state.auth_type; 99 if (http_connect(h, path, hoststr, auth, &location_changed) < 0) 100 goto fail; 101 if (s->http_code == 401) { 102 if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) { 103 url_close(hd); 104 goto redo; 105 } else 106 goto fail; 107 } 108 if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) { 109 /* url moved, get next */ 110 url_close(hd); 111 if (redirects++ >= MAX_REDIRECTS) 112 return AVERROR(EIO); 113 location_changed = 0; 114 goto redo; 115 } 116 return 0; 117 fail: 118 if (hd) 119 url_close(hd); 120 return AVERROR(EIO); 121} 122 123static int http_open(URLContext *h, const char *uri, int flags) 124{ 125 HTTPContext *s; 126 int ret; 127 128 h->is_streamed = 1; 129 130 s = av_malloc(sizeof(HTTPContext)); 131 if (!s) { 132 return AVERROR(ENOMEM); 133 } 134 h->priv_data = s; 135 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 ret = http_open_cnx(h); 142 if (ret != 0) 143 av_free (s); 144 return ret; 145} 146static int http_getc(HTTPContext *s) 147{ 148 int len; 149 if (s->buf_ptr >= s->buf_end) { 150 len = url_read(s->hd, s->buffer, BUFFER_SIZE); 151 if (len < 0) { 152 return AVERROR(EIO); 153 } else if (len == 0) { 154 return -1; 155 } else { 156 s->buf_ptr = s->buffer; 157 s->buf_end = s->buffer + len; 158 } 159 } 160 return *s->buf_ptr++; 161} 162 163static int http_get_line(HTTPContext *s, char *line, int line_size) 164{ 165 int ch; 166 char *q; 167 168 q = line; 169 for(;;) { 170 ch = http_getc(s); 171 if (ch < 0) 172 return AVERROR(EIO); 173 if (ch == '\n') { 174 /* process line */ 175 if (q > line && q[-1] == '\r') 176 q--; 177 *q = '\0'; 178 179 return 0; 180 } else { 181 if ((q - line) < line_size - 1) 182 *q++ = ch; 183 } 184 } 185} 186 187static int process_line(URLContext *h, char *line, int line_count, 188 int *new_location) 189{ 190 HTTPContext *s = h->priv_data; 191 char *tag, *p; 192 193 /* end of header */ 194 if (line[0] == '\0') 195 return 0; 196 197 p = line; 198 if (line_count == 0) { 199 while (!isspace(*p) && *p != '\0') 200 p++; 201 while (isspace(*p)) 202 p++; 203 s->http_code = strtol(p, NULL, 10); 204 205 dprintf(NULL, "http_code=%d\n", s->http_code); 206 207 /* error codes are 4xx and 5xx, but regard 401 as a success, so we 208 * don't abort until all headers have been parsed. */ 209 if (s->http_code >= 400 && s->http_code < 600 && s->http_code != 401) 210 return -1; 211 } else { 212 while (*p != '\0' && *p != ':') 213 p++; 214 if (*p != ':') 215 return 1; 216 217 *p = '\0'; 218 tag = line; 219 p++; 220 while (isspace(*p)) 221 p++; 222 if (!strcmp(tag, "Location")) { 223 strcpy(s->location, p); 224 *new_location = 1; 225 } else if (!strcmp (tag, "Content-Length") && s->filesize == -1) { 226 s->filesize = atoll(p); 227 } else if (!strcmp (tag, "Content-Range")) { 228 /* "bytes $from-$to/$document_size" */ 229 const char *slash; 230 if (!strncmp (p, "bytes ", 6)) { 231 p += 6; 232 s->off = atoll(p); 233 if ((slash = strchr(p, '/')) && strlen(slash) > 0) 234 s->filesize = atoll(slash+1); 235 } 236 h->is_streamed = 0; /* we _can_ in fact seek */ 237 } else if (!strcmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) { 238 s->filesize = -1; 239 s->chunksize = 0; 240 } else if (!strcmp (tag, "WWW-Authenticate")) { 241 ff_http_auth_handle_header(&s->auth_state, tag, p); 242 } else if (!strcmp (tag, "Authentication-Info")) { 243 ff_http_auth_handle_header(&s->auth_state, tag, p); 244 } 245 } 246 return 1; 247} 248 249static int http_connect(URLContext *h, const char *path, const char *hoststr, 250 const char *auth, int *new_location) 251{ 252 HTTPContext *s = h->priv_data; 253 int post, err; 254 char line[1024]; 255 char *authstr = NULL; 256 int64_t off = s->off; 257 258 259 /* send http header */ 260 post = h->flags & URL_WRONLY; 261 authstr = ff_http_auth_create_response(&s->auth_state, auth, path, 262 post ? "POST" : "GET"); 263 snprintf(s->buffer, sizeof(s->buffer), 264 "%s %s HTTP/1.1\r\n" 265 "User-Agent: %s\r\n" 266 "Accept: */*\r\n" 267 "Range: bytes=%"PRId64"-\r\n" 268 "Host: %s\r\n" 269 "%s" 270 "Connection: close\r\n" 271 "%s" 272 "\r\n", 273 post ? "POST" : "GET", 274 path, 275 LIBAVFORMAT_IDENT, 276 s->off, 277 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 /* init input buffer */ 286 s->buf_ptr = s->buffer; 287 s->buf_end = s->buffer; 288 s->line_count = 0; 289 s->off = 0; 290 s->filesize = -1; 291 if (post) { 292 /* always use chunked encoding for upload data */ 293 s->chunksize = 0; 294 return 0; 295 } 296 297 /* wait for header */ 298 for(;;) { 299 if (http_get_line(s, line, sizeof(line)) < 0) 300 return AVERROR(EIO); 301 302 dprintf(NULL, "header='%s'\n", line); 303 304 err = process_line(h, line, s->line_count, new_location); 305 if (err < 0) 306 return err; 307 if (err == 0) 308 break; 309 s->line_count++; 310 } 311 312 return (off == s->off) ? 0 : -1; 313} 314 315 316static int http_read(URLContext *h, uint8_t *buf, int size) 317{ 318 HTTPContext *s = h->priv_data; 319 int len; 320 321 if (s->chunksize >= 0) { 322 if (!s->chunksize) { 323 char line[32]; 324 325 for(;;) { 326 do { 327 if (http_get_line(s, line, sizeof(line)) < 0) 328 return AVERROR(EIO); 329 } while (!*line); /* skip CR LF from last chunk */ 330 331 s->chunksize = strtoll(line, NULL, 16); 332 333 dprintf(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize); 334 335 if (!s->chunksize) 336 return 0; 337 break; 338 } 339 } 340 size = FFMIN(size, s->chunksize); 341 } 342 /* read bytes from input buffer first */ 343 len = s->buf_end - s->buf_ptr; 344 if (len > 0) { 345 if (len > size) 346 len = size; 347 memcpy(buf, s->buf_ptr, len); 348 s->buf_ptr += len; 349 } else { 350 len = url_read(s->hd, buf, size); 351 } 352 if (len > 0) { 353 s->off += len; 354 if (s->chunksize > 0) 355 s->chunksize -= len; 356 } 357 return len; 358} 359 360/* used only when posting data */ 361static int http_write(URLContext *h, uint8_t *buf, int size) 362{ 363 char temp[11]; /* 32-bit hex + CRLF + nul */ 364 int ret; 365 char crlf[] = "\r\n"; 366 HTTPContext *s = h->priv_data; 367 368 if (s->chunksize == -1) { 369 /* headers are sent without any special encoding */ 370 return url_write(s->hd, buf, size); 371 } 372 373 /* silently ignore zero-size data since chunk encoding that would 374 * signal EOF */ 375 if (size > 0) { 376 /* upload data using chunked encoding */ 377 snprintf(temp, sizeof(temp), "%x\r\n", size); 378 379 if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 || 380 (ret = url_write(s->hd, buf, size)) < 0 || 381 (ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0) 382 return ret; 383 } 384 return size; 385} 386 387static int http_close(URLContext *h) 388{ 389 int ret = 0; 390 char footer[] = "0\r\n\r\n"; 391 HTTPContext *s = h->priv_data; 392 393 /* signal end of chunked encoding if used */ 394 if ((h->flags & URL_WRONLY) && s->chunksize != -1) { 395 ret = url_write(s->hd, footer, sizeof(footer) - 1); 396 ret = ret > 0 ? 0 : ret; 397 } 398 399 url_close(s->hd); 400 av_free(s); 401 return ret; 402} 403 404static int64_t http_seek(URLContext *h, int64_t off, int whence) 405{ 406 HTTPContext *s = h->priv_data; 407 URLContext *old_hd = s->hd; 408 int64_t old_off = s->off; 409 uint8_t old_buf[BUFFER_SIZE]; 410 int old_buf_size; 411 412 if (whence == AVSEEK_SIZE) 413 return s->filesize; 414 else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed) 415 return -1; 416 417 /* we save the old context in case the seek fails */ 418 old_buf_size = s->buf_end - s->buf_ptr; 419 memcpy(old_buf, s->buf_ptr, old_buf_size); 420 s->hd = NULL; 421 if (whence == SEEK_CUR) 422 off += s->off; 423 else if (whence == SEEK_END) 424 off += s->filesize; 425 s->off = off; 426 427 /* if it fails, continue on old connection */ 428 if (http_open_cnx(h) < 0) { 429 memcpy(s->buffer, old_buf, old_buf_size); 430 s->buf_ptr = s->buffer; 431 s->buf_end = s->buffer + old_buf_size; 432 s->hd = old_hd; 433 s->off = old_off; 434 return -1; 435 } 436 url_close(old_hd); 437 return off; 438} 439 440static int 441http_get_file_handle(URLContext *h) 442{ 443 HTTPContext *s = h->priv_data; 444 return url_get_file_handle(s->hd); 445} 446 447URLProtocol http_protocol = { 448 "http", 449 http_open, 450 http_read, 451 http_write, 452 http_seek, 453 http_close, 454 .url_get_file_handle = http_get_file_handle, 455}; 456