ffmpeg / libavformat / http.c @ bc371aca
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/*
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* HTTP protocol for ffmpeg client
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* Copyright (c) 2000, 2001 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h" |
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#include "avformat.h" |
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#include <unistd.h> |
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#include <strings.h> |
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#include "internal.h" |
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#include "network.h" |
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#include "http.h" |
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#include "os_support.h" |
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#include "httpauth.h" |
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#include "url.h" |
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#include "libavutil/opt.h" |
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/* XXX: POST protocol is not completely implemented because ffmpeg uses
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only a subset of it. */
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/* used for protocol handling */
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#define BUFFER_SIZE 1024 |
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#define MAX_REDIRECTS 8 |
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typedef struct { |
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const AVClass *class;
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URLContext *hd; |
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unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end; |
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int line_count;
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int http_code;
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int64_t chunksize; /**< Used if "Transfer-Encoding: chunked" otherwise -1. */
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int64_t off, filesize; |
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char location[MAX_URL_SIZE];
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HTTPAuthState auth_state; |
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unsigned char headers[BUFFER_SIZE]; |
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int willclose; /**< Set if the server correctly handles Connection: close and will close the connection after feeding us the content. */ |
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} HTTPContext; |
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|
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#define OFFSET(x) offsetof(HTTPContext, x)
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static const AVOption options[] = { |
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{"chunksize", "use chunked transfer-encoding for posts, -1 disables it, 0 enables it", OFFSET(chunksize), FF_OPT_TYPE_INT64, 0, -1, 0 }, /* Default to 0, for chunked POSTs */ |
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{NULL}
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}; |
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static const AVClass httpcontext_class = { |
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"HTTP", av_default_item_name, options, LIBAVUTIL_VERSION_INT
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}; |
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|
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static int http_connect(URLContext *h, const char *path, const char *hoststr, |
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const char *auth, int *new_location); |
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void ff_http_set_headers(URLContext *h, const char *headers) |
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{ |
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HTTPContext *s = h->priv_data; |
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int len = strlen(headers);
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|
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if (len && strcmp("\r\n", headers + len - 2)) |
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av_log(NULL, AV_LOG_ERROR, "No trailing CRLF found in HTTP header.\n"); |
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av_strlcpy(s->headers, headers, sizeof(s->headers));
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} |
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|
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void ff_http_set_chunked_transfer_encoding(URLContext *h, int is_chunked) |
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{ |
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((HTTPContext*)h->priv_data)->chunksize = is_chunked ? 0 : -1; |
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} |
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|
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void ff_http_init_auth_state(URLContext *dest, const URLContext *src) |
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{ |
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memcpy(&((HTTPContext*)dest->priv_data)->auth_state, |
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&((HTTPContext*)src->priv_data)->auth_state, sizeof(HTTPAuthState));
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} |
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/* return non zero if error */
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static int http_open_cnx(URLContext *h) |
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{ |
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const char *path, *proxy_path; |
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char hostname[1024], hoststr[1024]; |
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char auth[1024]; |
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char path1[1024]; |
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char buf[1024]; |
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int port, use_proxy, err, location_changed = 0, redirects = 0; |
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HTTPAuthType cur_auth_type; |
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HTTPContext *s = h->priv_data; |
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URLContext *hd = NULL;
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proxy_path = getenv("http_proxy");
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use_proxy = (proxy_path != NULL) && !getenv("no_proxy") && |
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av_strstart(proxy_path, "http://", NULL); |
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/* fill the dest addr */
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redo:
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/* needed in any case to build the host string */
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av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port, |
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path1, sizeof(path1), s->location);
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ff_url_join(hoststr, sizeof(hoststr), NULL, NULL, hostname, port, NULL); |
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if (use_proxy) {
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av_url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port, |
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NULL, 0, proxy_path); |
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path = s->location; |
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} else {
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if (path1[0] == '\0') |
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path = "/";
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else
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path = path1; |
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} |
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if (port < 0) |
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port = 80;
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|
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ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL); |
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err = ffurl_open(&hd, buf, URL_RDWR); |
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if (err < 0) |
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goto fail;
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s->hd = hd; |
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cur_auth_type = s->auth_state.auth_type; |
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if (http_connect(h, path, hoststr, auth, &location_changed) < 0) |
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goto fail;
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if (s->http_code == 401) { |
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if (cur_auth_type == HTTP_AUTH_NONE && s->auth_state.auth_type != HTTP_AUTH_NONE) {
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url_close(hd); |
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goto redo;
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} else
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goto fail;
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} |
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if ((s->http_code == 301 || s->http_code == 302 || s->http_code == 303 || s->http_code == 307) |
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&& location_changed == 1) {
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/* url moved, get next */
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url_close(hd); |
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if (redirects++ >= MAX_REDIRECTS)
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return AVERROR(EIO);
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location_changed = 0;
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goto redo;
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} |
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return 0; |
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fail:
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if (hd)
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url_close(hd); |
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s->hd = NULL;
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return AVERROR(EIO);
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} |
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static int http_open(URLContext *h, const char *uri, int flags) |
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{ |
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HTTPContext *s = h->priv_data; |
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h->is_streamed = 1;
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s->filesize = -1;
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av_strlcpy(s->location, uri, sizeof(s->location));
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return http_open_cnx(h);
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} |
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static int http_getc(HTTPContext *s) |
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{ |
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int len;
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if (s->buf_ptr >= s->buf_end) {
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len = ffurl_read(s->hd, s->buffer, BUFFER_SIZE); |
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if (len < 0) { |
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return AVERROR(EIO);
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} else if (len == 0) { |
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return -1; |
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} else {
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s->buf_ptr = s->buffer; |
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s->buf_end = s->buffer + len; |
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} |
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} |
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return *s->buf_ptr++;
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} |
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static int http_get_line(HTTPContext *s, char *line, int line_size) |
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{ |
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int ch;
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char *q;
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q = line; |
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for(;;) {
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ch = http_getc(s); |
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if (ch < 0) |
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return AVERROR(EIO);
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if (ch == '\n') { |
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/* process line */
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if (q > line && q[-1] == '\r') |
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q--; |
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*q = '\0';
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return 0; |
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} else {
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if ((q - line) < line_size - 1) |
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*q++ = ch; |
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} |
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} |
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} |
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static int process_line(URLContext *h, char *line, int line_count, |
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int *new_location)
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{ |
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HTTPContext *s = h->priv_data; |
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char *tag, *p, *end;
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/* end of header */
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if (line[0] == '\0') |
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return 0; |
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p = line; |
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if (line_count == 0) { |
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while (!isspace(*p) && *p != '\0') |
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p++; |
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while (isspace(*p))
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p++; |
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s->http_code = strtol(p, &end, 10);
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av_dlog(NULL, "http_code=%d\n", s->http_code); |
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/* error codes are 4xx and 5xx, but regard 401 as a success, so we
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* don't abort until all headers have been parsed. */
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if (s->http_code >= 400 && s->http_code < 600 && s->http_code != 401) { |
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end += strspn(end, SPACE_CHARS); |
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av_log(NULL, AV_LOG_WARNING, "HTTP error %d %s\n", |
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s->http_code, end); |
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return -1; |
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} |
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} else {
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while (*p != '\0' && *p != ':') |
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p++; |
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if (*p != ':') |
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return 1; |
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*p = '\0';
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tag = line; |
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p++; |
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while (isspace(*p))
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p++; |
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if (!strcasecmp(tag, "Location")) { |
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strcpy(s->location, p); |
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*new_location = 1;
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} else if (!strcasecmp (tag, "Content-Length") && s->filesize == -1) { |
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s->filesize = atoll(p); |
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} else if (!strcasecmp (tag, "Content-Range")) { |
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/* "bytes $from-$to/$document_size" */
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const char *slash; |
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if (!strncmp (p, "bytes ", 6)) { |
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p += 6;
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s->off = atoll(p); |
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if ((slash = strchr(p, '/')) && strlen(slash) > 0) |
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s->filesize = atoll(slash+1);
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} |
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h->is_streamed = 0; /* we _can_ in fact seek */ |
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} else if (!strcasecmp (tag, "Transfer-Encoding") && !strncasecmp(p, "chunked", 7)) { |
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s->filesize = -1;
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s->chunksize = 0;
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} else if (!strcasecmp (tag, "WWW-Authenticate")) { |
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ff_http_auth_handle_header(&s->auth_state, tag, p); |
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} else if (!strcasecmp (tag, "Authentication-Info")) { |
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ff_http_auth_handle_header(&s->auth_state, tag, p); |
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} else if (!strcasecmp (tag, "Connection")) { |
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if (!strcmp(p, "close")) |
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s->willclose = 1;
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} |
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} |
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return 1; |
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} |
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|
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static inline int has_header(const char *str, const char *header) |
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{ |
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/* header + 2 to skip over CRLF prefix. (make sure you have one!) */
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return av_stristart(str, header + 2, NULL) || av_stristr(str, header); |
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} |
285 |
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static int http_connect(URLContext *h, const char *path, const char *hoststr, |
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const char *auth, int *new_location) |
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{ |
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HTTPContext *s = h->priv_data; |
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int post, err;
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char line[1024]; |
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char headers[1024] = ""; |
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char *authstr = NULL; |
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int64_t off = s->off; |
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int len = 0; |
296 |
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/* send http header */
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post = h->flags & URL_WRONLY; |
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authstr = ff_http_auth_create_response(&s->auth_state, auth, path, |
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post ? "POST" : "GET"); |
302 |
|
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/* set default headers if needed */
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if (!has_header(s->headers, "\r\nUser-Agent: ")) |
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len += av_strlcatf(headers + len, sizeof(headers) - len,
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"User-Agent: %s\r\n", LIBAVFORMAT_IDENT);
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if (!has_header(s->headers, "\r\nAccept: ")) |
308 |
len += av_strlcpy(headers + len, "Accept: */*\r\n",
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sizeof(headers) - len);
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if (!has_header(s->headers, "\r\nRange: ")) |
311 |
len += av_strlcatf(headers + len, sizeof(headers) - len,
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"Range: bytes=%"PRId64"-\r\n", s->off); |
313 |
if (!has_header(s->headers, "\r\nConnection: ")) |
314 |
len += av_strlcpy(headers + len, "Connection: close\r\n",
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sizeof(headers)-len);
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316 |
if (!has_header(s->headers, "\r\nHost: ")) |
317 |
len += av_strlcatf(headers + len, sizeof(headers) - len,
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318 |
"Host: %s\r\n", hoststr);
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|
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/* now add in custom headers */
|
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av_strlcpy(headers+len, s->headers, sizeof(headers)-len);
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|
323 |
snprintf(s->buffer, sizeof(s->buffer),
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"%s %s HTTP/1.1\r\n"
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325 |
"%s"
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326 |
"%s"
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327 |
"%s"
|
328 |
"\r\n",
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post ? "POST" : "GET", |
330 |
path, |
331 |
post && s->chunksize >= 0 ? "Transfer-Encoding: chunked\r\n" : "", |
332 |
headers, |
333 |
authstr ? authstr : "");
|
334 |
|
335 |
av_freep(&authstr); |
336 |
if (url_write(s->hd, s->buffer, strlen(s->buffer)) < 0) |
337 |
return AVERROR(EIO);
|
338 |
|
339 |
/* init input buffer */
|
340 |
s->buf_ptr = s->buffer; |
341 |
s->buf_end = s->buffer; |
342 |
s->line_count = 0;
|
343 |
s->off = 0;
|
344 |
s->filesize = -1;
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s->willclose = 0;
|
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if (post) {
|
347 |
/* Pretend that it did work. We didn't read any header yet, since
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348 |
* we've still to send the POST data, but the code calling this
|
349 |
* function will check http_code after we return. */
|
350 |
s->http_code = 200;
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351 |
return 0; |
352 |
} |
353 |
s->chunksize = -1;
|
354 |
|
355 |
/* wait for header */
|
356 |
for(;;) {
|
357 |
if (http_get_line(s, line, sizeof(line)) < 0) |
358 |
return AVERROR(EIO);
|
359 |
|
360 |
av_dlog(NULL, "header='%s'\n", line); |
361 |
|
362 |
err = process_line(h, line, s->line_count, new_location); |
363 |
if (err < 0) |
364 |
return err;
|
365 |
if (err == 0) |
366 |
break;
|
367 |
s->line_count++; |
368 |
} |
369 |
|
370 |
return (off == s->off) ? 0 : -1; |
371 |
} |
372 |
|
373 |
|
374 |
static int http_read(URLContext *h, uint8_t *buf, int size) |
375 |
{ |
376 |
HTTPContext *s = h->priv_data; |
377 |
int len;
|
378 |
|
379 |
if (s->chunksize >= 0) { |
380 |
if (!s->chunksize) {
|
381 |
char line[32]; |
382 |
|
383 |
for(;;) {
|
384 |
do {
|
385 |
if (http_get_line(s, line, sizeof(line)) < 0) |
386 |
return AVERROR(EIO);
|
387 |
} while (!*line); /* skip CR LF from last chunk */ |
388 |
|
389 |
s->chunksize = strtoll(line, NULL, 16); |
390 |
|
391 |
av_dlog(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize); |
392 |
|
393 |
if (!s->chunksize)
|
394 |
return 0; |
395 |
break;
|
396 |
} |
397 |
} |
398 |
size = FFMIN(size, s->chunksize); |
399 |
} |
400 |
/* read bytes from input buffer first */
|
401 |
len = s->buf_end - s->buf_ptr; |
402 |
if (len > 0) { |
403 |
if (len > size)
|
404 |
len = size; |
405 |
memcpy(buf, s->buf_ptr, len); |
406 |
s->buf_ptr += len; |
407 |
} else {
|
408 |
if (!s->willclose && s->filesize >= 0 && s->off >= s->filesize) |
409 |
return AVERROR_EOF;
|
410 |
len = ffurl_read(s->hd, buf, size); |
411 |
} |
412 |
if (len > 0) { |
413 |
s->off += len; |
414 |
if (s->chunksize > 0) |
415 |
s->chunksize -= len; |
416 |
} |
417 |
return len;
|
418 |
} |
419 |
|
420 |
/* used only when posting data */
|
421 |
static int http_write(URLContext *h, const uint8_t *buf, int size) |
422 |
{ |
423 |
char temp[11] = ""; /* 32-bit hex + CRLF + nul */ |
424 |
int ret;
|
425 |
char crlf[] = "\r\n"; |
426 |
HTTPContext *s = h->priv_data; |
427 |
|
428 |
if (s->chunksize == -1) { |
429 |
/* non-chunked data is sent without any special encoding */
|
430 |
return url_write(s->hd, buf, size);
|
431 |
} |
432 |
|
433 |
/* silently ignore zero-size data since chunk encoding that would
|
434 |
* signal EOF */
|
435 |
if (size > 0) { |
436 |
/* upload data using chunked encoding */
|
437 |
snprintf(temp, sizeof(temp), "%x\r\n", size); |
438 |
|
439 |
if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 || |
440 |
(ret = url_write(s->hd, buf, size)) < 0 ||
|
441 |
(ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0) |
442 |
return ret;
|
443 |
} |
444 |
return size;
|
445 |
} |
446 |
|
447 |
static int http_close(URLContext *h) |
448 |
{ |
449 |
int ret = 0; |
450 |
char footer[] = "0\r\n\r\n"; |
451 |
HTTPContext *s = h->priv_data; |
452 |
|
453 |
/* signal end of chunked encoding if used */
|
454 |
if ((h->flags & URL_WRONLY) && s->chunksize != -1) { |
455 |
ret = url_write(s->hd, footer, sizeof(footer) - 1); |
456 |
ret = ret > 0 ? 0 : ret; |
457 |
} |
458 |
|
459 |
if (s->hd)
|
460 |
url_close(s->hd); |
461 |
return ret;
|
462 |
} |
463 |
|
464 |
static int64_t http_seek(URLContext *h, int64_t off, int whence) |
465 |
{ |
466 |
HTTPContext *s = h->priv_data; |
467 |
URLContext *old_hd = s->hd; |
468 |
int64_t old_off = s->off; |
469 |
uint8_t old_buf[BUFFER_SIZE]; |
470 |
int old_buf_size;
|
471 |
|
472 |
if (whence == AVSEEK_SIZE)
|
473 |
return s->filesize;
|
474 |
else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed) |
475 |
return -1; |
476 |
|
477 |
/* we save the old context in case the seek fails */
|
478 |
old_buf_size = s->buf_end - s->buf_ptr; |
479 |
memcpy(old_buf, s->buf_ptr, old_buf_size); |
480 |
s->hd = NULL;
|
481 |
if (whence == SEEK_CUR)
|
482 |
off += s->off; |
483 |
else if (whence == SEEK_END) |
484 |
off += s->filesize; |
485 |
s->off = off; |
486 |
|
487 |
/* if it fails, continue on old connection */
|
488 |
if (http_open_cnx(h) < 0) { |
489 |
memcpy(s->buffer, old_buf, old_buf_size); |
490 |
s->buf_ptr = s->buffer; |
491 |
s->buf_end = s->buffer + old_buf_size; |
492 |
s->hd = old_hd; |
493 |
s->off = old_off; |
494 |
return -1; |
495 |
} |
496 |
url_close(old_hd); |
497 |
return off;
|
498 |
} |
499 |
|
500 |
static int |
501 |
http_get_file_handle(URLContext *h) |
502 |
{ |
503 |
HTTPContext *s = h->priv_data; |
504 |
return url_get_file_handle(s->hd);
|
505 |
} |
506 |
|
507 |
URLProtocol ff_http_protocol = { |
508 |
"http",
|
509 |
http_open, |
510 |
http_read, |
511 |
http_write, |
512 |
http_seek, |
513 |
http_close, |
514 |
.url_get_file_handle = http_get_file_handle, |
515 |
.priv_data_size = sizeof(HTTPContext),
|
516 |
.priv_data_class = &httpcontext_class, |
517 |
}; |