ffmpeg/libav/http.c

319 lines
7.3 KiB
C

/*
* HTTP protocol for ffmpeg client
* Copyright (c) 2000, 2001 Gerard Lantau.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "avformat.h"
/* XXX: POST protocol is not completly implemented because ffmpeg use
only a subset of it */
//#define DEBUG
/* used for protocol handling */
#define BUFFER_SIZE 1024
#define URL_SIZE 4096
typedef struct {
int fd;
unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
int line_count;
int http_code;
char location[URL_SIZE];
} HTTPContext;
static int http_connect(URLContext *h, const char *path);
static int http_write(URLContext *h, UINT8 *buf, int size);
/* return non zero if error */
static int http_open(URLContext *h, const char *uri, int flags)
{
struct sockaddr_in dest_addr;
const char *p, *path, *proxy_path;
char hostname[1024], *q;
int port, fd = -1, use_proxy;
struct hostent *hp;
HTTPContext *s;
h->is_streamed = 1;
s = malloc(sizeof(HTTPContext));
if (!s) {
return -ENOMEM;
}
h->priv_data = s;
proxy_path = getenv("http_proxy");
use_proxy = (proxy_path != NULL) && !getenv("no_proxy");
/* fill the dest addr */
redo:
if (use_proxy) {
p = proxy_path;
} else {
p = uri;
}
if (!strstart(p, "http://", &p))
goto fail;
q = hostname;
while (*p != ':' && *p != '/' && *p != '\0') {
if ((q - hostname) < sizeof(hostname) - 1)
*q++ = *p;
p++;
}
*q = '\0';
port = 80;
if (*p == ':') {
p++;
port = strtoul(p, (char **)&p, 10);
}
if (port <= 0)
goto fail;
if (use_proxy) {
path = uri;
} else {
if (*p == '\0')
path = "/";
else
path = p;
}
dest_addr.sin_family = AF_INET;
dest_addr.sin_port = htons(port);
if ((inet_aton(hostname, &dest_addr.sin_addr)) == 0) {
hp = gethostbyname(hostname);
if (!hp)
goto fail;
memcpy (&dest_addr.sin_addr, hp->h_addr, sizeof(dest_addr.sin_addr));
}
fd = socket(PF_INET, SOCK_STREAM, 0);
if (fd < 0)
goto fail;
if (connect(fd, (struct sockaddr *)&dest_addr,
sizeof(dest_addr)) < 0)
goto fail;
s->fd = fd;
if (http_connect(h, path) < 0)
goto fail;
if (s->http_code == 303 && s->location[0] != '\0') {
/* url moved, get next */
uri = s->location;
goto redo;
}
return 0;
fail:
if (fd >= 0)
close(fd);
free(s);
return -EIO;
}
static int http_getc(HTTPContext *s)
{
int len;
if (s->buf_ptr >= s->buf_end) {
redo:
len = read(s->fd, s->buffer, BUFFER_SIZE);
if (len < 0) {
if (errno == EAGAIN || errno == EINTR)
goto redo;
return -EIO;
} else if (len == 0) {
return -1;
} else {
s->buf_ptr = s->buffer;
s->buf_end = s->buffer + len;
}
}
return *s->buf_ptr++;
}
static int process_line(HTTPContext *s, char *line, int line_count)
{
char *tag, *p;
/* end of header */
if (line[0] == '\0')
return 0;
p = line;
if (line_count == 0) {
while (!isspace(*p) && *p != '\0')
p++;
while (isspace(*p))
p++;
s->http_code = strtol(p, NULL, 10);
#ifdef DEBUG
printf("http_code=%d\n", s->http_code);
#endif
} else {
while (*p != '\0' && *p != ':')
p++;
if (*p != ':')
return 1;
*p = '\0';
tag = line;
p++;
while (isspace(*p))
p++;
if (!strcmp(tag, "Location")) {
strcpy(s->location, p);
}
}
return 1;
}
static int http_connect(URLContext *h, const char *path)
{
HTTPContext *s = h->priv_data;
int post, err, ch;
char line[1024], *q;
/* send http header */
post = h->flags & URL_WRONLY;
snprintf(s->buffer, sizeof(s->buffer),
"%s %s HTTP/1.0\n"
"User-Agent: FFmpeg %s\n"
"Accept: */*\n"
"\n",
post ? "POST" : "GET",
path,
FFMPEG_VERSION
);
if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
return -EIO;
/* init input buffer */
s->buf_ptr = s->buffer;
s->buf_end = s->buffer;
s->line_count = 0;
s->location[0] = '\0';
if (post)
return 0;
/* wait for header */
q = line;
for(;;) {
ch = http_getc(s);
if (ch < 0)
return -EIO;
if (ch == '\n') {
/* process line */
if (q > line && q[-1] == '\r')
q--;
*q = '\0';
#ifdef DEBUG
printf("header='%s'\n", line);
#endif
err = process_line(s, line, s->line_count);
if (err < 0)
return err;
if (err == 0)
return 0;
s->line_count++;
q = line;
} else {
if ((q - line) < sizeof(line) - 1)
*q++ = ch;
}
}
}
static int http_read(URLContext *h, UINT8 *buf, int size)
{
HTTPContext *s = h->priv_data;
int size1, len;
size1 = size;
while (size > 0) {
/* read bytes from input buffer first */
len = s->buf_end - s->buf_ptr;
if (len > 0) {
if (len > size)
len = size;
memcpy(buf, s->buf_ptr, len);
s->buf_ptr += len;
} else {
len = read (s->fd, buf, size);
if (len < 0) {
if (errno != EINTR && errno != EAGAIN)
return -errno;
else
continue;
} else if (len == 0) {
break;
}
}
size -= len;
buf += len;
}
return size1 - size;
}
/* used only when posting data */
static int http_write(URLContext *h, UINT8 *buf, int size)
{
HTTPContext *s = h->priv_data;
int ret, size1;
size1 = size;
while (size > 0) {
ret = write (s->fd, buf, size);
if (ret < 0 && errno != EINTR && errno != EAGAIN)
return -errno;
size -= ret;
buf += ret;
}
return size1 - size;
}
static int http_close(URLContext *h)
{
HTTPContext *s = h->priv_data;
close(s->fd);
return 0;
}
URLProtocol http_protocol = {
"http",
http_open,
http_read,
http_write,
NULL, /* seek */
http_close,
};