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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file proto_ext_or.c
* @brief Parsing/encoding for the extended OR protocol.
**/
#include "core/or/or.h"
#include "lib/buf/buffers.h"
#include "feature/relay/ext_orport.h"
#include "core/proto/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;
}
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