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/*****************************************************************************
* chunked.c: HTTP 1.1 chunked encoding
*****************************************************************************
* Copyright © 2015 Rémi Denis-Courmont
*
* This program 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.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <errno.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vlc_common.h>
#include <vlc_block.h>
#include <vlc_tls.h> /* TODO: remove this */
#include "message.h"
#include "conn.h"
struct vlc_chunked_stream
{
struct vlc_http_stream stream;
struct vlc_http_stream *parent;
struct vlc_tls *tls;
uintmax_t chunk_length;
bool eof;
bool error;
};
static void *vlc_chunked_fatal(struct vlc_chunked_stream *s)
{
s->error = true;
return vlc_http_error;
}
static struct vlc_http_msg *vlc_chunked_wait(struct vlc_http_stream *stream)
{
/* Request trailers are not supported so far.
* There cannot be headers during chunked encoding. */
(void) stream;
return NULL;
}
static block_t *vlc_chunked_read(struct vlc_http_stream *stream)
{
struct vlc_chunked_stream *s =
container_of(stream, struct vlc_chunked_stream, stream);
block_t *block = NULL;
if (s->eof)
return NULL;
if (s->error)
return vlc_http_error;
/* Read chunk size (hexadecimal length) */
if (s->chunk_length == 0)
{ /* NOTE: This accepts LF in addition to CRLF. No big deal. */
char *line = vlc_tls_GetLine(s->tls);
if (line == NULL)
{
errno = EPROTO;
return vlc_chunked_fatal(s);
}
int end;
if (sscanf(line, "%" SCNxMAX "%n", &s->chunk_length, &end) < 1
|| (line[end] != '\0' && line[end] != ';' /* ignore extension(s) */))
s->chunk_length = UINTMAX_MAX;
free(line);
if (s->chunk_length == UINTMAX_MAX)
{
errno = EPROTO;
return vlc_chunked_fatal(s);
}
}
/* Read chunk data */
if (s->chunk_length > 0)
{
size_t size = 1536; /* arbitrary */
if (size > s->chunk_length)
size = s->chunk_length;
block = block_Alloc(size);
if (unlikely(block == NULL))
return NULL;
ssize_t val = vlc_tls_Read(s->tls, block->p_buffer, size, false);
if (val <= 0)
{ /* Connection error (-) or unexpected end of connection (0) */
block_Release(block);
return vlc_chunked_fatal(s);
}
block->i_buffer = val;
s->chunk_length -= val;
}
else
s->eof = true;
/* Read chunk end (CRLF) */
if (s->chunk_length == 0)
{
char crlf[2];
if (vlc_tls_Read(s->tls, crlf, 2, true) < 2 || memcmp(crlf, "\r\n", 2))
vlc_chunked_fatal(s);
}
return block;
}
static void vlc_chunked_close(struct vlc_http_stream *stream, bool abort)
{
struct vlc_chunked_stream *s =
container_of(stream, struct vlc_chunked_stream, stream);
if (!s->eof) /* Abort connection if stream is closed before end */
vlc_chunked_fatal(s);
vlc_http_stream_close(s->parent, abort || s->error);
free(s);
}
static struct vlc_http_stream_cbs vlc_chunked_callbacks =
{
vlc_chunked_wait,
vlc_chunked_read,
vlc_chunked_close,
};
struct vlc_http_stream *vlc_chunked_open(struct vlc_http_stream *parent,
struct vlc_tls *tls)
{
struct vlc_chunked_stream *s = malloc(sizeof (*s));
if (unlikely(s == NULL))
return NULL;
s->stream.cbs = &vlc_chunked_callbacks;
s->parent = parent;
s->tls = tls;
s->chunk_length = 0;
s->eof = false;
s->error = false;
return &s->stream;
}
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