41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* Copyright (c) 2001 Matej Pfajfar.
|
|
* Copyright (c) 2001-2004, Roger Dingledine.
|
|
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
|
|
* Copyright (c) 2007-2017, The Tor Project, Inc. */
|
|
/* See LICENSE for licensing information */
|
|
|
|
#include "or.h"
|
|
#include "buffers.h"
|
|
#include "ext_orport.h"
|
|
#include "proto_ext_or.h"
|
|
|
|
/** The size of the header of an Extended ORPort message: 2 bytes for
|
|
* COMMAND, 2 bytes for BODYLEN */
|
|
#define EXT_OR_CMD_HEADER_SIZE 4
|
|
|
|
/** Read <b>buf</b>, which should contain an Extended ORPort message
|
|
* from a transport proxy. If well-formed, create and populate
|
|
* <b>out</b> with the Extended ORport message. Return 0 if the
|
|
* buffer was incomplete, 1 if it was well-formed and -1 if we
|
|
* encountered an error while parsing it. */
|
|
int
|
|
fetch_ext_or_command_from_buf(buf_t *buf, ext_or_cmd_t **out)
|
|
{
|
|
char hdr[EXT_OR_CMD_HEADER_SIZE];
|
|
uint16_t len;
|
|
|
|
if (buf_datalen(buf) < EXT_OR_CMD_HEADER_SIZE)
|
|
return 0;
|
|
buf_peek(buf, hdr, sizeof(hdr));
|
|
len = ntohs(get_uint16(hdr+2));
|
|
if (buf_datalen(buf) < (unsigned)len + EXT_OR_CMD_HEADER_SIZE)
|
|
return 0;
|
|
*out = ext_or_cmd_new(len);
|
|
(*out)->cmd = ntohs(get_uint16(hdr));
|
|
(*out)->len = len;
|
|
buf_drain(buf, EXT_OR_CMD_HEADER_SIZE);
|
|
buf_get_bytes(buf, (*out)->body, len);
|
|
return 1;
|
|
}
|
|
|