mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-31 05:26:37 +02:00
444 lines
12 KiB
C
444 lines
12 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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/base64.h"
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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 "network.h"
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#include "os_support.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 URL_SIZE 4096
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#define MAX_REDIRECTS 8
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typedef struct {
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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[URL_SIZE];
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} HTTPContext;
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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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static int http_write(URLContext *h, uint8_t *buf, int size);
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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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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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url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
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path1, sizeof(path1), s->location);
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if (port > 0) {
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snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
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} else {
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av_strlcpy(hoststr, hostname, sizeof(hoststr));
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}
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if (use_proxy) {
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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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snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
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err = url_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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if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
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goto fail;
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if ((s->http_code == 302 || s->http_code == 303) && 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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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;
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int ret;
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h->is_streamed = 1;
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s = av_malloc(sizeof(HTTPContext));
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if (!s) {
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return AVERROR(ENOMEM);
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}
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h->priv_data = s;
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s->filesize = -1;
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s->chunksize = -1;
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s->off = 0;
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av_strlcpy(s->location, uri, URL_SIZE);
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ret = http_open_cnx(h);
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if (ret != 0)
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av_free (s);
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return ret;
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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 = url_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;
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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, NULL, 10);
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dprintf(NULL, "http_code=%d\n", s->http_code);
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/* error codes are 4xx and 5xx */
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if (s->http_code >= 400 && s->http_code < 600)
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return -1;
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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 (!strcmp(tag, "Location")) {
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strcpy(s->location, p);
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*new_location = 1;
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} else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
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s->filesize = atoll(p);
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} else if (!strcmp (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 (!strcmp (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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}
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}
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return 1;
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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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{
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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 *auth_b64;
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int auth_b64_len = (strlen(auth) + 2) / 3 * 4 + 1;
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int64_t off = s->off;
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/* send http header */
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post = h->flags & URL_WRONLY;
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auth_b64 = av_malloc(auth_b64_len);
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av_base64_encode(auth_b64, auth_b64_len, auth, strlen(auth));
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snprintf(s->buffer, sizeof(s->buffer),
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"%s %s HTTP/1.1\r\n"
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"User-Agent: %s\r\n"
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"Accept: */*\r\n"
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"Range: bytes=%"PRId64"-\r\n"
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"Host: %s\r\n"
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"Authorization: Basic %s\r\n"
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"Connection: close\r\n"
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"%s"
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"\r\n",
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post ? "POST" : "GET",
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path,
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LIBAVFORMAT_IDENT,
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s->off,
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hoststr,
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auth_b64,
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post ? "Transfer-Encoding: chunked\r\n" : "");
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av_freep(&auth_b64);
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if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
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return AVERROR(EIO);
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/* init input buffer */
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s->buf_ptr = s->buffer;
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s->buf_end = s->buffer;
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s->line_count = 0;
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s->off = 0;
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s->filesize = -1;
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if (post) {
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/* always use chunked encoding for upload data */
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s->chunksize = 0;
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return 0;
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}
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/* wait for header */
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for(;;) {
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if (http_get_line(s, line, sizeof(line)) < 0)
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return AVERROR(EIO);
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dprintf(NULL, "header='%s'\n", line);
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err = process_line(h, line, s->line_count, new_location);
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if (err < 0)
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return err;
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if (err == 0)
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break;
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s->line_count++;
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}
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return (off == s->off) ? 0 : -1;
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}
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static int http_read(URLContext *h, uint8_t *buf, int size)
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{
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HTTPContext *s = h->priv_data;
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int len;
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if (s->chunksize >= 0) {
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if (!s->chunksize) {
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char line[32];
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for(;;) {
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do {
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if (http_get_line(s, line, sizeof(line)) < 0)
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return AVERROR(EIO);
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} while (!*line); /* skip CR LF from last chunk */
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s->chunksize = strtoll(line, NULL, 16);
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dprintf(NULL, "Chunked encoding data size: %"PRId64"'\n", s->chunksize);
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if (!s->chunksize)
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return 0;
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break;
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}
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}
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size = FFMIN(size, s->chunksize);
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}
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/* read bytes from input buffer first */
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len = s->buf_end - s->buf_ptr;
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if (len > 0) {
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if (len > size)
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len = size;
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memcpy(buf, s->buf_ptr, len);
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s->buf_ptr += len;
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} else {
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len = url_read(s->hd, buf, size);
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}
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if (len > 0) {
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s->off += len;
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if (s->chunksize > 0)
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s->chunksize -= len;
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}
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return len;
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}
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/* used only when posting data */
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static int http_write(URLContext *h, uint8_t *buf, int size)
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{
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char temp[11]; /* 32-bit hex + CRLF + nul */
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int ret;
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char crlf[] = "\r\n";
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HTTPContext *s = h->priv_data;
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if (s->chunksize == -1) {
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/* headers are sent without any special encoding */
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return url_write(s->hd, buf, size);
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}
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/* silently ignore zero-size data since chunk encoding that would
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* signal EOF */
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if (size > 0) {
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/* upload data using chunked encoding */
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snprintf(temp, sizeof(temp), "%x\r\n", size);
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if ((ret = url_write(s->hd, temp, strlen(temp))) < 0 ||
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(ret = url_write(s->hd, buf, size)) < 0 ||
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(ret = url_write(s->hd, crlf, sizeof(crlf) - 1)) < 0)
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return ret;
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}
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return size;
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}
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static int http_close(URLContext *h)
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{
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int ret = 0;
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char footer[] = "0\r\n\r\n";
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HTTPContext *s = h->priv_data;
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/* signal end of chunked encoding if used */
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if ((h->flags & URL_WRONLY) && s->chunksize != -1) {
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ret = url_write(s->hd, footer, sizeof(footer) - 1);
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ret = ret > 0 ? 0 : ret;
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}
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url_close(s->hd);
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av_free(s);
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return ret;
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}
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static int64_t http_seek(URLContext *h, int64_t off, int whence)
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{
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HTTPContext *s = h->priv_data;
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URLContext *old_hd = s->hd;
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int64_t old_off = s->off;
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uint8_t old_buf[BUFFER_SIZE];
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int old_buf_size;
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if (whence == AVSEEK_SIZE)
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return s->filesize;
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else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
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return -1;
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/* we save the old context in case the seek fails */
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old_buf_size = s->buf_end - s->buf_ptr;
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memcpy(old_buf, s->buf_ptr, old_buf_size);
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s->hd = NULL;
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if (whence == SEEK_CUR)
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off += s->off;
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else if (whence == SEEK_END)
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off += s->filesize;
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s->off = off;
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/* if it fails, continue on old connection */
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if (http_open_cnx(h) < 0) {
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memcpy(s->buffer, old_buf, old_buf_size);
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s->buf_ptr = s->buffer;
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s->buf_end = s->buffer + old_buf_size;
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s->hd = old_hd;
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s->off = old_off;
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return -1;
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}
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url_close(old_hd);
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return off;
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}
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static int
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http_get_file_handle(URLContext *h)
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{
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HTTPContext *s = h->priv_data;
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return url_get_file_handle(s->hd);
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}
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URLProtocol http_protocol = {
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"http",
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http_open,
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http_read,
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http_write,
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http_seek,
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http_close,
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.url_get_file_handle = http_get_file_handle,
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};
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