27 lines
745 B
C
27 lines
745 B
C
/* Copyright (c) 2001 Matej Pfajfar.
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* Copyright (c) 2001-2004, Roger Dingledine.
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2017, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#include "or.h"
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#include "buffers.h"
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#include "proto_control0.h"
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/** Return 1 iff buf looks more like it has an (obsolete) v0 controller
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* command on it than any valid v1 controller command. */
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int
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peek_buf_has_control0_command(buf_t *buf)
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{
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if (buf_datalen(buf) >= 4) {
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char header[4];
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uint16_t cmd;
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buf_peek(buf, header, sizeof(header));
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cmd = ntohs(get_uint16(header+2));
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if (cmd <= 0x14)
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return 1; /* This is definitely not a v1 control command. */
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}
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return 0;
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}
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