mirror of
https://git.ffmpeg.org/ffmpeg.git
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333 lines
8.2 KiB
C
333 lines
8.2 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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#ifndef __BEOS__
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# include <arpa/inet.h>
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#else
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# include "barpainet.h"
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#endif
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#include <netdb.h>
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/* XXX: POST protocol is not completly implemented because ffmpeg use
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only a subset of it */
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//#define DEBUG
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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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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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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);
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static int http_write(URLContext *h, uint8_t *buf, int size);
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static char *b64_encode(const unsigned char *src );
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/* return non zero if error */
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static int http_open(URLContext *h, const char *uri, int flags)
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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;
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HTTPContext *s;
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URLContext *hd = NULL;
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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 -ENOMEM;
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}
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h->priv_data = s;
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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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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), uri);
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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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pstrcpy(hoststr, sizeof(hoststr), hostname);
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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 = uri;
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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) < 0)
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goto fail;
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if (s->http_code == 303 && s->location[0] != '\0') {
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/* url moved, get next */
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uri = s->location;
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url_close(hd);
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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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av_free(s);
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return AVERROR_IO;
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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_IO;
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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 process_line(HTTPContext *s, char *line, int line_count)
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{
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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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#ifdef DEBUG
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printf("http_code=%d\n", s->http_code);
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#endif
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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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}
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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)
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{
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HTTPContext *s = h->priv_data;
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int post, err, ch;
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char line[1024], *q;
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/* send http header */
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post = h->flags & URL_WRONLY;
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snprintf(s->buffer, sizeof(s->buffer),
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"%s %s HTTP/1.0\r\n"
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"User-Agent: %s\r\n"
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"Accept: */*\r\n"
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"Host: %s\r\n"
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"Authorization: Basic %s\r\n"
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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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hoststr,
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b64_encode(auth));
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if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
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return AVERROR_IO;
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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->location[0] = '\0';
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if (post) {
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sleep(1);
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return 0;
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}
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/* wait for header */
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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_IO;
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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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#ifdef DEBUG
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printf("header='%s'\n", line);
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#endif
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err = process_line(s, line, s->line_count);
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if (err < 0)
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return err;
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if (err == 0)
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return 0;
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s->line_count++;
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q = line;
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} else {
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if ((q - line) < sizeof(line) - 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 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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/* 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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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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HTTPContext *s = h->priv_data;
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return url_write(s->hd, buf, size);
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}
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static int http_close(URLContext *h)
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{
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HTTPContext *s = h->priv_data;
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url_close(s->hd);
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av_free(s);
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return 0;
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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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NULL, /* seek */
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http_close,
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};
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/*****************************************************************************
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* b64_encode: stolen from VLC's http.c
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*****************************************************************************/
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static char *b64_encode( const unsigned char *src )
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{
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static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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unsigned int len= strlen(src);
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char *ret, *dst;
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unsigned i_bits = 0;
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unsigned i_shift = 0;
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if(len < UINT_MAX/4){
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ret=dst= av_malloc( len * 4 / 3 + 12 );
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}else
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return NULL;
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for( ;; )
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{
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if( *src )
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{
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i_bits = ( i_bits << 8 )|( *src++ );
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i_shift += 8;
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}
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else if( i_shift > 0 )
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{
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i_bits <<= 6 - i_shift;
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i_shift = 6;
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}
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else
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{
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*dst++ = '=';
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break;
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}
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while( i_shift >= 6 )
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{
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i_shift -= 6;
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*dst++ = b64[(i_bits >> i_shift)&0x3f];
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}
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}
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*dst++ = '\0';
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return ret;
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}
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