/* * HTTP protocol for ffmpeg client * Copyright (c) 2000, 2001 Fabrice Bellard. * * 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 */ #include "libavutil/base64.h" #include "libavutil/avstring.h" #include "avformat.h" #include <unistd.h> #include "network.h" #include "os_support.h" /* XXX: POST protocol is not completely implemented because ffmpeg uses only a subset of it. */ //#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; int64_t off, filesize; 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") && av_strstart(proxy_path, "http://", NULL); /* 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 { av_strlcpy(hoststr, hostname, sizeof(hoststr)); } 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; if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) { /* url moved, get next */ url_close(hd); if (redirects++ >= MAX_REDIRECTS) return AVERROR(EIO); location_changed = 0; goto redo; } return 0; fail: if (hd) url_close(hd); return AVERROR(EIO); } 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; av_strlcpy(s->location, uri, URL_SIZE); 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) { return AVERROR(EIO); } else if (len == 0) { return -1; } else { s->buf_ptr = s->buffer; s->buf_end = s->buffer + len; } } return *s->buf_ptr++; } 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 /* error codes are 4xx and 5xx */ if (s->http_code >= 400 && s->http_code < 600) return -1; } 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; int post, err, ch; char line[1024], *q; char *auth_b64; int auth_b64_len = strlen(auth)* 4 / 3 + 12; int64_t off = s->off; /* send http header */ post = h->flags & URL_WRONLY; auth_b64 = av_malloc(auth_b64_len); av_base64_encode(auth_b64, auth_b64_len, auth, strlen(auth)); 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" "Connection: close\r\n" "\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) return AVERROR(EIO); /* init input buffer */ s->buf_ptr = s->buffer; s->buf_end = s->buffer; s->line_count = 0; s->off = 0; s->filesize = -1; if (post) { return 0; } /* wait for header */ 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'; #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++; q = line; } else { if ((q - line) < sizeof(line) - 1) *q++ = ch; } } 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; } static int64_t http_seek(URLContext *h, int64_t off, int whence) { HTTPContext *s = h->priv_data; URLContext *old_hd = s->hd; int64_t old_off = s->off; 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; } URLProtocol http_protocol = { "http", http_open, http_read, http_write, http_seek, http_close, };