2001-07-22 16:18:56 +02:00
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/*
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* HTTP protocol for ffmpeg client
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* Copyright (c) 2000, 2001 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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2001-08-13 23:37:10 +02:00
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#include "avformat.h"
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2001-07-22 16:18:56 +02:00
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#include <unistd.h>
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#include <ctype.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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#include <arpa/inet.h>
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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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int fd;
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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);
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static int http_write(URLContext *h, UINT8 *buf, int size);
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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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struct sockaddr_in dest_addr;
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const char *p, *path, *proxy_path;
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char hostname[1024], *q;
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int port, fd = -1, use_proxy;
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struct hostent *hp;
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HTTPContext *s;
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h->is_streamed = 1;
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s = 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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/* fill the dest addr */
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redo:
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if (use_proxy) {
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p = proxy_path;
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} else {
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p = uri;
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}
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if (!strstart(p, "http://", &p))
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goto fail;
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q = hostname;
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while (*p != ':' && *p != '/' && *p != '\0') {
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if ((q - hostname) < sizeof(hostname) - 1)
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*q++ = *p;
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p++;
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}
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*q = '\0';
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port = 80;
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if (*p == ':') {
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p++;
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port = strtoul(p, (char **)&p, 10);
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}
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if (port <= 0)
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goto fail;
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if (use_proxy) {
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path = uri;
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} else {
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if (*p == '\0')
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path = "/";
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else
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path = p;
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}
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dest_addr.sin_family = AF_INET;
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dest_addr.sin_port = htons(port);
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if ((inet_aton(hostname, &dest_addr.sin_addr)) == 0) {
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hp = gethostbyname(hostname);
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if (!hp)
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goto fail;
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memcpy (&dest_addr.sin_addr, hp->h_addr, sizeof(dest_addr.sin_addr));
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}
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fd = socket(PF_INET, SOCK_STREAM, 0);
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if (fd < 0)
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goto fail;
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if (connect(fd, (struct sockaddr *)&dest_addr,
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sizeof(dest_addr)) < 0)
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goto fail;
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s->fd = fd;
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if (http_connect(h, path) < 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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goto redo;
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}
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return 0;
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fail:
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if (fd >= 0)
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close(fd);
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free(s);
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return -EIO;
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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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redo:
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len = read(s->fd, s->buffer, BUFFER_SIZE);
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if (len < 0) {
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if (errno == EAGAIN || errno == EINTR)
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goto redo;
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return -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 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)
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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\n"
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"User-Agent: FFmpeg %s\n"
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"Accept: */*\n"
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"\n",
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post ? "POST" : "GET",
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path,
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FFMPEG_VERSION
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);
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if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
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return -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->location[0] = '\0';
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if (post)
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return 0;
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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 -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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#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 *buf, int size)
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{
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HTTPContext *s = h->priv_data;
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int size1, len;
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size1 = size;
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while (size > 0) {
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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 = read (s->fd, buf, size);
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if (len < 0) {
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if (errno != EINTR && errno != EAGAIN)
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return -errno;
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else
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continue;
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} else if (len == 0) {
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break;
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}
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}
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size -= len;
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buf += len;
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}
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return size1 - size;
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}
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/* used only when posting data */
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static int http_write(URLContext *h, UINT8 *buf, int size)
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{
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HTTPContext *s = h->priv_data;
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int ret, size1;
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size1 = size;
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while (size > 0) {
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ret = write (s->fd, buf, size);
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if (ret < 0 && errno != EINTR && errno != EAGAIN)
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return -errno;
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size -= ret;
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buf += ret;
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}
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return size1 - 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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close(s->fd);
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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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