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Diffstat (limited to 'src/or/proto_control0.c')
-rw-r--r-- | src/or/proto_control0.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/src/or/proto_control0.c b/src/or/proto_control0.c new file mode 100644 index 0000000000..c17ba34948 --- /dev/null +++ b/src/or/proto_control0.c @@ -0,0 +1,26 @@ +/* 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; +} + |