ffmpeg/libavformat/http.c

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/*
* HTTP protocol for ffmpeg client
* Copyright (c) 2000, 2001 Fabrice Bellard.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#ifndef __BEOS__
# include <arpa/inet.h>
#else
# include "barpainet.h"
#endif
#include <netdb.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 {
URLContext *hd;
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, const char *hoststr,
const char *auth);
static int http_write(URLContext *h, uint8_t *buf, int size);
static char *b64_encode(const unsigned char *src );
/* return non zero if error */
static int http_open(URLContext *h, const char *uri, int flags)
{
const char *path, *proxy_path;
char hostname[1024], hoststr[1024];
char auth[1024];
char path1[1024];
char buf[1024];
int port, use_proxy, err;
HTTPContext *s;
URLContext *hd = NULL;
h->is_streamed = 1;
s = av_malloc(sizeof(HTTPContext));
if (!s) {
return -ENOMEM;
}
h->priv_data = s;
proxy_path = getenv("http_proxy");
use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
strstart(proxy_path, "http://", NULL);
/* fill the dest addr */
redo:
/* needed in any case to build the host string */
url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
path1, sizeof(path1), uri);
if (port > 0) {
snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
} else {
pstrcpy(hoststr, sizeof(hoststr), hostname);
}
if (use_proxy) {
url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
NULL, 0, proxy_path);
path = uri;
} else {
if (path1[0] == '\0')
path = "/";
else
path = path1;
}
if (port < 0)
port = 80;
snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
err = url_open(&hd, buf, URL_RDWR);
if (err < 0)
goto fail;
s->hd = hd;
if (http_connect(h, path, hoststr, auth) < 0)
goto fail;
if (s->http_code == 303 && s->location[0] != '\0') {
/* url moved, get next */
uri = s->location;
url_close(hd);
goto redo;
}
return 0;
fail:
if (hd)
url_close(hd);
av_free(s);
return AVERROR_IO;
}
static int http_getc(HTTPContext *s)
{
int len;
if (s->buf_ptr >= s->buf_end) {
len = url_read(s->hd, s->buffer, BUFFER_SIZE);
if (len < 0) {
return AVERROR_IO;
} 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, const char *hoststr,
const char *auth)
{
HTTPContext *s = h->priv_data;
int post, err, ch;
char line[1024], *q;
char *auth_b64;
/* send http header */
post = h->flags & URL_WRONLY;
auth_b64 = b64_encode(auth);
snprintf(s->buffer, sizeof(s->buffer),
"%s %s HTTP/1.0\r\n"
"User-Agent: %s\r\n"
"Accept: */*\r\n"
"Host: %s\r\n"
"Authorization: Basic %s\r\n"
"\r\n",
post ? "POST" : "GET",
path,
LIBAVFORMAT_IDENT,
hoststr,
auth_b64);
av_freep(&auth_b64);
if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
return AVERROR_IO;
/* init input buffer */
s->buf_ptr = s->buffer;
s->buf_end = s->buffer;
s->line_count = 0;
s->location[0] = '\0';
if (post) {
sleep(1);
return 0;
}
/* wait for header */
q = line;
for(;;) {
ch = http_getc(s);
if (ch < 0)
return AVERROR_IO;
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_t *buf, int size)
{
HTTPContext *s = h->priv_data;
int len;
/* 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 = url_read(s->hd, buf, size);
}
return len;
}
/* used only when posting data */
static int http_write(URLContext *h, uint8_t *buf, int size)
{
HTTPContext *s = h->priv_data;
return url_write(s->hd, buf, size);
}
static int http_close(URLContext *h)
{
HTTPContext *s = h->priv_data;
url_close(s->hd);
av_free(s);
return 0;
}
URLProtocol http_protocol = {
"http",
http_open,
http_read,
http_write,
NULL, /* seek */
http_close,
};
/*****************************************************************************
* b64_encode: stolen from VLC's http.c
* simplified by michael
*****************************************************************************/
static char *b64_encode( const unsigned char *src )
{
static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
unsigned int len= strlen(src);
char *ret, *dst;
unsigned i_bits = 0;
unsigned i_shift = 0;
if(len < UINT_MAX/4){
ret=dst= av_malloc( len * 4 / 3 + 12 );
}else
return NULL;
while(*src){
i_bits = (i_bits << 8) + *src++;
i_shift += 8;
do{
*dst++ = b64[(i_bits << 6 >> i_shift) & 0x3f];
i_shift -= 6;
}while( i_shift > 6 || (*src == 0 && i_shift>0));
}
*dst++ = '=';
*dst = '\0';
return ret;
}