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/* packet-ayiya.c
* Anything in Anything protocol
* Copyright 2008, Jelmer Vernooij <jelmer@samba.org>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* ref: http://unfix.org/~jeroen/archive/drafts/draft-massar-v6ops-ayiya-02.html#anchor4
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/ipproto.h>
void proto_register_ayiya(void);
void proto_reg_handoff_ayiya(void);
static dissector_table_t ip_dissector_table;
static int proto_ayiya;
static int hf_id_len;
static int hf_id_type;
static int hf_sig_len;
static int hf_hash_method;
static int hf_auth_method;
static int hf_opcode;
static int hf_next_header;
static int hf_epoch;
static int hf_identity;
static int hf_signature;
static int ett_ayiya;
static dissector_handle_t ayiya_handle;
static const value_string identity_types[] = {
{ 0x0, "None" },
{ 0x1, "Integer" },
{ 0x2, "ASCII string" },
{ 0, NULL }
};
static const value_string hash_methods[] = {
{ 0x0, "No hash" },
{ 0x1, "MD5" },
{ 0x2, "SHA1" },
{ 0, NULL }
};
static const value_string auth_methods[] = {
{ 0x0, "No authentication" },
{ 0x1, "Hash using a Shared Secret" },
{ 0x2, "Hash using a public/private key method" },
{ 0, NULL }
};
#define OPCODE_FORWARD 1
static const value_string opcodes[] = {
{ 0x0, "No Operation / Heartbeat" },
{ 0x1, "Forward" },
{ 0x2, "Echo Request" },
{ 0x3, "Echo Request and Forward" },
{ 0x4, "Echo Response" },
{ 0x5, "MOTD" },
{ 0x6, "Query Request" },
{ 0x7, "Query Response" },
{ 0, NULL }
};
#define UDP_PORT_AYIYA 5072
static int
dissect_ayiya(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *ayiya_tree;
int offset = 0;
int idlen, siglen, ayiya_len;
uint8_t next_header, opcode;
tvbuff_t *payload;
idlen = 1 << tvb_get_bits8(tvb, 0, 4);
siglen = tvb_get_bits8(tvb, 8, 4) * 4;
opcode = tvb_get_bits8(tvb, 20, 4);
next_header = tvb_get_uint8(tvb, 3);
ayiya_len = 8+idlen+siglen;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "AYIYA");
if (tree) {
proto_item *ti;
ti = proto_tree_add_protocol_format( tree, proto_ayiya, tvb,
offset, ayiya_len, "AYIYA" );
ayiya_tree = proto_item_add_subtree(ti, ett_ayiya);
proto_tree_add_bits_item(ayiya_tree, hf_id_len, tvb, 0, 4, ENC_BIG_ENDIAN);
proto_tree_add_bits_item(ayiya_tree, hf_id_type, tvb, 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_bits_item(ayiya_tree, hf_sig_len, tvb, 8, 4, ENC_BIG_ENDIAN);
proto_tree_add_bits_item(ayiya_tree, hf_hash_method, tvb, 12, 4, ENC_BIG_ENDIAN);
proto_tree_add_bits_item(ayiya_tree, hf_auth_method, tvb, 16, 4, ENC_BIG_ENDIAN);
proto_tree_add_bits_item(ayiya_tree, hf_opcode, tvb, 20, 4, ENC_BIG_ENDIAN);
proto_tree_add_uint_format_value(ayiya_tree, hf_next_header, tvb,
3, 1, next_header,
"%s (0x%02x)",
ipprotostr(next_header), next_header);
proto_tree_add_item(ayiya_tree, hf_epoch, tvb, 4, 4, ENC_TIME_SECS|ENC_BIG_ENDIAN);
proto_tree_add_item(ayiya_tree, hf_identity, tvb, 8, idlen, ENC_NA);
proto_tree_add_item(ayiya_tree, hf_signature, tvb, 8+idlen, siglen, ENC_NA);
}
offset = ayiya_len;
switch (opcode) {
case OPCODE_FORWARD:
payload = tvb_new_subset_remaining(tvb, offset);
dissector_try_uint(ip_dissector_table, next_header, payload, pinfo, tree);
break;
}
return tvb_captured_length(tvb);
}
void
proto_register_ayiya(void)
{
static hf_register_info hf[] = {
{ &hf_id_len,
{ "Identity field length", "ayiya.idlen", FT_UINT8,
BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{ &hf_id_type,
{ "Identity field type", "ayiya.idtype", FT_UINT8,
BASE_HEX, VALS(identity_types), 0x0, NULL, HFILL
}
},
{ &hf_sig_len,
{ "Signature Length", "ayiya.siglen", FT_UINT8,
BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{ &hf_hash_method,
{ "Hash method", "ayiya.hashmethod", FT_UINT8,
BASE_HEX, VALS(hash_methods), 0x0, NULL, HFILL
}
},
{ &hf_auth_method,
{ "Authentication method", "ayiya.authmethod", FT_UINT8,
BASE_HEX, VALS(auth_methods), 0x0, NULL, HFILL
}
},
{ &hf_opcode,
{ "Operation Code", "ayiya.opcode", FT_UINT8,
BASE_HEX, VALS(opcodes), 0x0, NULL, HFILL
}
},
{ &hf_next_header,
{ "Next Header", "ayiya.nextheader", FT_UINT8,
BASE_HEX, NULL, 0x0, NULL, HFILL
}
},
{ &hf_epoch,
{ "Epoch", "ayiya.epoch", FT_ABSOLUTE_TIME,
ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL
}
},
{ &hf_identity,
{ "Identity", "ayiya.identity", FT_BYTES,
BASE_NONE, NULL, 0x0, NULL, HFILL
}
},
{ &hf_signature,
{ "Signature", "ayiya.signature", FT_BYTES,
BASE_NONE, NULL, 0x0, NULL, HFILL
}
},
};
static int *ett[] = {
&ett_ayiya,
};
proto_ayiya = proto_register_protocol("Anything in Anything Protocol",
"AYIYA", "ayiya");
ayiya_handle = register_dissector("ayiya", dissect_ayiya, proto_ayiya);
proto_register_field_array(proto_ayiya, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_ayiya(void)
{
dissector_add_uint_with_preference("udp.port", UDP_PORT_AYIYA, ayiya_handle);
ip_dissector_table = find_dissector_table("ip.proto");
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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