tor/src/or/proto_control0.c

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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) 2007-2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */
#include "or.h"
#include "buffers.h"
#include "proto_control0.h"
/** Return 1 iff buf looks more like it has an (obsolete) v0 controller
* command on it than any valid v1 controller command. */
int
peek_buf_has_control0_command(buf_t *buf)
{
if (buf_datalen(buf) >= 4) {
char header[4];
uint16_t cmd;
buf_peek(buf, header, sizeof(header));
cmd = ntohs(get_uint16(header+2));
if (cmd <= 0x14)
return 1; /* This is definitely not a v1 control command. */
}
return 0;
}