forked from osmocom/wireshark
![Joerg Mayer](/assets/img/avatar_default.png)
Change-Id: Ic4be950dba934f3d4eb407b6d623f95022ef1985 Reviewed-on: https://code.wireshark.org/review/28580 Reviewed-by: Jörg Mayer <jmayer@loplof.de>
363 lines
13 KiB
C
363 lines
13 KiB
C
/* packet-stcsig.c
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* Routines for dissecting Spirent Test Center Signatures
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* Copyright 2018 Joerg Mayer (see AUTHORS file)
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* Based on disassembly of Spirent's modified version of Wireshark 1.10.3
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/* The logic is based on the dissassembly of libwireshark.dll which was
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* part of wireshark-win64-1.10.3-spirent-2.exe, distributed by Spirent
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* to customers of their Spirent Test Center.
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* As the installer displays the normal GPLv2+ license the choice was
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* made to go with dissassembly instead of finding out who to ask for
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* the source code.
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*
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* Please report errors or missing features when compared to the original.
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*/
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/* TODO:
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* - Find out the meaning of the unknown trailer (perhaps some fcs or
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* some prbseq related stuff?)
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* - Find out meaning of prbseq
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* - Is there a (fixed) structure in the csp field?
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* - Validate the timestamp decoding: The seconds value is identical to
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* Spirent's stcsig dissector, the ns value differs significantly
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* - Find out what the TSLR really stands for - currently just a guess
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*/
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#define NEW_PROTO_TREE_API
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#include "config.h"
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#include <epan/packet.h>
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#include <tfs.h>
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void proto_register_stcsig(void);
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void proto_reg_handoff_stcsig(void);
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static int proto_stcsig = -1;
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#define PROTO_SHORT_NAME "STCSIG"
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#define PROTO_LONG_NAME "Spirent Test Center Signature"
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static header_field_info *hfi_stcsig = NULL;
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#define STCSIG_HFI_INIT HFI_INIT(proto_stcsig)
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static header_field_info hfi_stcsig_rawdata STCSIG_HFI_INIT =
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{ "Raw Data", "stcsig.rawdata", FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL };
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static header_field_info hfi_stcsig_iv STCSIG_HFI_INIT =
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{ "IV", "stcsig.iv", FT_UINT8, BASE_HEX, NULL, 0x0,
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"Deobfuscation Initialization Vector and Complement of Sequence Low Byte", HFILL };
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static header_field_info hfi_stcsig_streamid STCSIG_HFI_INIT =
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{ "StreamID", "stcsig.streamid", FT_INT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL };
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static header_field_info hfi_stcsig_csp STCSIG_HFI_INIT =
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{ "ChassisSlotPort", "stcsig.csp", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL };
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static header_field_info hfi_stcsig_seqnum_complement STCSIG_HFI_INIT =
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{ "Complement (EDM)", "stcsig.complement", FT_UINT16, BASE_DEC, NULL, 0x0,
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"Complement of high bytes of Sequence Number", HFILL };
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static header_field_info hfi_stcsig_seqnum_edm STCSIG_HFI_INIT =
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{ "Sequence Number (EDM)", "stcsig.seqnum", FT_UINT32, BASE_DEC, NULL, 0x0,
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"Sequence Number (Enhanced Detection Mode)", HFILL };
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static header_field_info hfi_stcsig_seqnum_sm STCSIG_HFI_INIT =
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{ "Sequence Number (SM)", "stcsig.seqnum", FT_UINT48, BASE_DEC, NULL, 0x0,
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"Sequence Number (Sequence Mode)", HFILL };
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static header_field_info hfi_stcsig_streamindex STCSIG_HFI_INIT =
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{ "Stream Index", "stcsig.streamindex", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL };
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static header_field_info hfi_stcsig_timestamp STCSIG_HFI_INIT =
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{ "Timestamp", "stcsig.timestamp", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
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NULL, HFILL };
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static header_field_info hfi_stcsig_prbseq STCSIG_HFI_INIT =
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{ "Pseudo-Random Binary Sequence", "stcsig.prbseq", FT_BOOLEAN, 8, TFS(&tfs_true_false), 0x02,
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NULL, HFILL };
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static const true_false_string tfs_end_start = { "EndOfFrame", "StartOfFrame" };
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static header_field_info hfi_stcsig_tslr STCSIG_HFI_INIT =
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{ "TSLR", "stcsig.tslr", FT_BOOLEAN, 8, TFS(&tfs_end_start), 0x01,
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"Time Stamp Location Reference", HFILL };
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static const true_false_string tfs_hard_soft = { "Hard", "Soft" };
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static header_field_info hfi_stcsig_streamtype STCSIG_HFI_INIT =
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{ "StreamType", "stcsig.streamtype", FT_BOOLEAN, 8, TFS(&tfs_hard_soft), 0x80,
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NULL, HFILL };
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static header_field_info hfi_stcsig_unknown STCSIG_HFI_INIT =
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{ "Unknown", "stcsig.unknown", FT_BYTES, BASE_NONE, NULL, 0x0,
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"Unknown Trailer (not obfuscated)", HFILL };
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static gint ett_stcsig = -1;
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static gint ett_stcsig_streamid = -1;
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/*
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* For the last 20 bytes of the data section to be a Spirent Signature
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* the fist byte (offset 0) plus the 11th byte (offset 10) of the deocded
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* signature must add up to 255
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*/
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static gboolean
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is_signature(tvbuff_t *tvb, gint sigoffset)
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{
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/*
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* How to generate the table below:
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*
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* static guint8 runit = 1;
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* for(int k=0; k<256; k++) {
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* obfuscation_value = k;
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* for(int i=1; i<=10; i++) {
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* obfuscation_value = deobfuscate_this[obfuscation_value];
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* }
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* printf("0x%02x, ", obfuscation_value);
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* if (k%8 == 7) printf("\n");
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* }
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*/
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static const guint8 deobfuscate_offset_10[256] = {
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0x00, 0x86, 0x0d, 0x8b, 0x9d, 0x1b, 0x90, 0x16,
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0xbc, 0x3a, 0xb1, 0x37, 0x21, 0xa7, 0x2c, 0xaa,
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0x78, 0xfe, 0x75, 0xf3, 0xe5, 0x63, 0xe8, 0x6e,
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0xc4, 0x42, 0xc9, 0x4f, 0x59, 0xdf, 0x54, 0xd2,
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0xf1, 0x77, 0xfc, 0x7a, 0x6c, 0xea, 0x61, 0xe7,
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0x4d, 0xcb, 0x40, 0xc6, 0xd0, 0x56, 0xdd, 0x5b,
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0x89, 0x0f, 0x84, 0x02, 0x14, 0x92, 0x19, 0x9f,
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0x35, 0xb3, 0x38, 0xbe, 0xa8, 0x2e, 0xa5, 0x23,
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0xe2, 0x64, 0xef, 0x69, 0x7f, 0xf9, 0x72, 0xf4,
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0x5e, 0xd8, 0x53, 0xd5, 0xc3, 0x45, 0xce, 0x48,
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0x9a, 0x1c, 0x97, 0x11, 0x07, 0x81, 0x0a, 0x8c,
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0x26, 0xa0, 0x2b, 0xad, 0xbb, 0x3d, 0xb6, 0x30,
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0x13, 0x95, 0x1e, 0x98, 0x8e, 0x08, 0x83, 0x05,
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0xaf, 0x29, 0xa2, 0x24, 0x32, 0xb4, 0x3f, 0xb9,
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0x6b, 0xed, 0x66, 0xe0, 0xf6, 0x70, 0xfb, 0x7d,
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0xd7, 0x51, 0xda, 0x5c, 0x4a, 0xcc, 0x47, 0xc1,
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0x43, 0xc5, 0x4e, 0xc8, 0xde, 0x58, 0xd3, 0x55,
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0xff, 0x79, 0xf2, 0x74, 0x62, 0xe4, 0x6f, 0xe9,
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0x3b, 0xbd, 0x36, 0xb0, 0xa6, 0x20, 0xab, 0x2d,
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0x87, 0x01, 0x8a, 0x0c, 0x1a, 0x9c, 0x17, 0x91,
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0xb2, 0x34, 0xbf, 0x39, 0x2f, 0xa9, 0x22, 0xa4,
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0x0e, 0x88, 0x03, 0x85, 0x93, 0x15, 0x9e, 0x18,
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0xca, 0x4c, 0xc7, 0x41, 0x57, 0xd1, 0x5a, 0xdc,
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0x76, 0xf0, 0x7b, 0xfd, 0xeb, 0x6d, 0xe6, 0x60,
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0xa1, 0x27, 0xac, 0x2a, 0x3c, 0xba, 0x31, 0xb7,
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0x1d, 0x9b, 0x10, 0x96, 0x80, 0x06, 0x8d, 0x0b,
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0xd9, 0x5f, 0xd4, 0x52, 0x44, 0xc2, 0x49, 0xcf,
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0x65, 0xe3, 0x68, 0xee, 0xf8, 0x7e, 0xf5, 0x73,
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0x50, 0xd6, 0x5d, 0xdb, 0xcd, 0x4b, 0xc0, 0x46,
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0xec, 0x6a, 0xe1, 0x67, 0x71, 0xf7, 0x7c, 0xfa,
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0x28, 0xae, 0x25, 0xa3, 0xb5, 0x33, 0xb8, 0x3e,
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0x94, 0x12, 0x99, 0x1f, 0x09, 0x8f, 0x04, 0x82
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};
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guint8 byte0;
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guint8 byte10;
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/* Byte 0 also is the initialization vector for the obfuscation of offsets 1 - 15 */
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byte0 = tvb_get_guint8(tvb, sigoffset);
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byte10 = tvb_get_guint8(tvb, sigoffset + 10);
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if (byte0 + (byte10 ^ deobfuscate_offset_10[byte0]) == 255) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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static void
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decode_signature(guint8* decode_buffer)
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{
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static const guint8 deobfuscate_this[256] = {
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0x00, 0x71, 0xe3, 0x92, 0xb6, 0xc7, 0x55, 0x24,
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0x1c, 0x6d, 0xff, 0x8e, 0xaa, 0xdb, 0x49, 0x38,
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0x39, 0x48, 0xda, 0xab, 0x8f, 0xfe, 0x6c, 0x1d,
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0x25, 0x54, 0xc6, 0xb7, 0x93, 0xe2, 0x70, 0x01,
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0x72, 0x03, 0x91, 0xe0, 0xc4, 0xb5, 0x27, 0x56,
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0x6e, 0x1f, 0x8d, 0xfc, 0xd8, 0xa9, 0x3b, 0x4a,
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0x4b, 0x3a, 0xa8, 0xd9, 0xfd, 0x8c, 0x1e, 0x6f,
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0x57, 0x26, 0xb4, 0xc5, 0xe1, 0x90, 0x02, 0x73,
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0xe4, 0x95, 0x07, 0x76, 0x52, 0x23, 0xb1, 0xc0,
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0xf8, 0x89, 0x1b, 0x6a, 0x4e, 0x3f, 0xad, 0xdc,
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0xdd, 0xac, 0x3e, 0x4f, 0x6b, 0x1a, 0x88, 0xf9,
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0xc1, 0xb0, 0x22, 0x53, 0x77, 0x06, 0x94, 0xe5,
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0x96, 0xe7, 0x75, 0x04, 0x20, 0x51, 0xc3, 0xb2,
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0x8a, 0xfb, 0x69, 0x18, 0x3c, 0x4d, 0xdf, 0xae,
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0xaf, 0xde, 0x4c, 0x3d, 0x19, 0x68, 0xfa, 0x8b,
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0xb3, 0xc2, 0x50, 0x21, 0x05, 0x74, 0xe6, 0x97,
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0xb8, 0xc9, 0x5b, 0x2a, 0x0e, 0x7f, 0xed, 0x9c,
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0xa4, 0xd5, 0x47, 0x36, 0x12, 0x63, 0xf1, 0x80,
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0x81, 0xf0, 0x62, 0x13, 0x37, 0x46, 0xd4, 0xa5,
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0x9d, 0xec, 0x7e, 0x0f, 0x2b, 0x5a, 0xc8, 0xb9,
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0xca, 0xbb, 0x29, 0x58, 0x7c, 0x0d, 0x9f, 0xee,
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0xd6, 0xa7, 0x35, 0x44, 0x60, 0x11, 0x83, 0xf2,
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0xf3, 0x82, 0x10, 0x61, 0x45, 0x34, 0xa6, 0xd7,
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0xef, 0x9e, 0x0c, 0x7d, 0x59, 0x28, 0xba, 0xcb,
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0x5c, 0x2d, 0xbf, 0xce, 0xea, 0x9b, 0x09, 0x78,
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0x40, 0x31, 0xa3, 0xd2, 0xf6, 0x87, 0x15, 0x64,
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0x65, 0x14, 0x86, 0xf7, 0xd3, 0xa2, 0x30, 0x41,
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0x79, 0x08, 0x9a, 0xeb, 0xcf, 0xbe, 0x2c, 0x5d,
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0x2e, 0x5f, 0xcd, 0xbc, 0x98, 0xe9, 0x7b, 0x0a,
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0x32, 0x43, 0xd1, 0xa0, 0x84, 0xf5, 0x67, 0x16,
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0x17, 0x66, 0xf4, 0x85, 0xa1, 0xd0, 0x42, 0x33,
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0x0b, 0x7a, 0xe8, 0x99, 0xbd, 0xcc, 0x5e, 0x2f
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};
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guint8 obfuscation_value;
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obfuscation_value = decode_buffer[0];
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for(int i=1; i<16; i++) {
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obfuscation_value = deobfuscate_this[obfuscation_value];
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decode_buffer[i] ^= obfuscation_value;
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}
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/* decode_buffer[16...19] is unobfuscated */
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}
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static int
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dissect_stcsig(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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gint bytes, length;
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gint sig_offset;
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tvbuff_t *stcsig_tvb;
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proto_item *ti;
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proto_tree *stcsig_tree;
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proto_tree *stcsig_streamid_tree;
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guint8 *real_stcsig;
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guint64 timestamp_2_5_ns;
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nstime_t timestamp;
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length = tvb_captured_length(tvb);
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if (length >= 21 && tvb_get_guint8(tvb, length - 21) == 0 && is_signature(tvb, length - 20)) {
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bytes = 20;
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} else if (length >= 25 && tvb_get_guint8(tvb, length - 25) == 0 && is_signature(tvb, length - 24)) {
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/* Sigsize + 4 bytes FCS */
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bytes = 24;
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} else if (length >= 29 && tvb_get_guint8(tvb, length - 29) == 0 && is_signature(tvb, length - 28)) {
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/* Sigsize + 8 bytes FCS, i.e. FibreChannel */
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bytes = 28;
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} else if (length >= 20 && is_signature(tvb, length - 20)) {
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bytes = 20;
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} else if (length >= 24 && is_signature(tvb, length - 24)) {
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/* Sigsize + 4 bytes FCS */
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bytes = 24;
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} else if (length >= 28 && is_signature(tvb, length - 28)) {
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/* Sigsize + 8 bytes FCS, i.e. FibreChannel */
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bytes = 28;
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} else {
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return 0;
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}
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sig_offset = length - bytes;
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#if 0
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/* Maybe make this a preference */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
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col_set_str(pinfo->cinfo, COL_INFO, PROTO_LONG_NAME);
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#endif
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real_stcsig = (guint8 *)tvb_memdup(pinfo->pool, tvb, sig_offset, 20);
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decode_signature(real_stcsig);
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stcsig_tvb = tvb_new_child_real_data(tvb, real_stcsig, 20, 20);
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add_new_data_source(pinfo, stcsig_tvb, PROTO_LONG_NAME);
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ti = proto_tree_add_item(tree, hfi_stcsig, tvb, sig_offset, 20, ENC_NA);
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stcsig_tree = proto_item_add_subtree(ti, ett_stcsig);
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proto_tree_add_item(stcsig_tree, &hfi_stcsig_rawdata, tvb, sig_offset, 20, ENC_NA);
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proto_tree_add_item(stcsig_tree, &hfi_stcsig_iv, stcsig_tvb, 0, 1, ENC_NA);
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ti = proto_tree_add_item(stcsig_tree, &hfi_stcsig_streamid, stcsig_tvb, 1, 4, ENC_BIG_ENDIAN);
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stcsig_streamid_tree = proto_item_add_subtree(ti, ett_stcsig_streamid);
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/* This subtree is mostly an optical hierachy, auto expand it */
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tree_expanded_set(ett_stcsig_streamid, TRUE);
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proto_tree_add_item(stcsig_streamid_tree, &hfi_stcsig_csp, stcsig_tvb, 1, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(stcsig_streamid_tree, &hfi_stcsig_streamtype, stcsig_tvb, 3, 1, ENC_NA);
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proto_tree_add_item(stcsig_streamid_tree, &hfi_stcsig_streamindex, stcsig_tvb, 3, 2, ENC_BIG_ENDIAN);
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if (tvb_get_ntohs(stcsig_tvb, 5) + tvb_get_ntohs(stcsig_tvb, 7) == 0xffff) {
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proto_tree_add_item(stcsig_tree, &hfi_stcsig_seqnum_complement, stcsig_tvb, 5, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(stcsig_tree, &hfi_stcsig_seqnum_edm, stcsig_tvb, 7, 4, ENC_BIG_ENDIAN);
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} else {
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proto_tree_add_item(stcsig_tree, &hfi_stcsig_seqnum_sm, stcsig_tvb, 5, 6, ENC_BIG_ENDIAN);
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}
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timestamp_2_5_ns = (guint64)(tvb_get_guint8(stcsig_tvb, 15) & 0xfc) << 30;
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timestamp_2_5_ns |= tvb_get_ntohl(stcsig_tvb, 11);
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timestamp.secs = timestamp_2_5_ns / 400000000L;
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timestamp.nsecs = timestamp_2_5_ns % 400000000L;
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proto_tree_add_time(stcsig_tree, &hfi_stcsig_timestamp, stcsig_tvb, 11, 5, ×tamp);
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proto_tree_add_item(stcsig_tree, &hfi_stcsig_prbseq, stcsig_tvb, 15, 1, ENC_NA);
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proto_tree_add_item(stcsig_tree, &hfi_stcsig_tslr, stcsig_tvb, 15, 1, ENC_NA);
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proto_tree_add_item(stcsig_tree, &hfi_stcsig_unknown, stcsig_tvb, 16, 4, ENC_NA);
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/* Ignored for post-dissectors but required by function type */
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return length;
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}
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void
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proto_register_stcsig(void)
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{
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#ifndef HAVE_HFI_SECTION_INIT
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static header_field_info *hfi[] = {
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&hfi_stcsig_rawdata,
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&hfi_stcsig_iv, /* &hfi_stcsig_seqbyte, */
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&hfi_stcsig_streamtype,
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&hfi_stcsig_streamid,
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&hfi_stcsig_csp,
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&hfi_stcsig_seqnum_complement,
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&hfi_stcsig_seqnum_edm,
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&hfi_stcsig_seqnum_sm,
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&hfi_stcsig_streamindex,
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&hfi_stcsig_timestamp,
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&hfi_stcsig_prbseq,
|
|
&hfi_stcsig_tslr,
|
|
&hfi_stcsig_unknown
|
|
};
|
|
#endif
|
|
|
|
static gint *ett[] = {
|
|
&ett_stcsig,
|
|
&ett_stcsig_streamid
|
|
};
|
|
|
|
dissector_handle_t stcsig_handle;
|
|
|
|
proto_stcsig = proto_register_protocol(PROTO_LONG_NAME, PROTO_SHORT_NAME, "stcsig");
|
|
hfi_stcsig = proto_registrar_get_nth(proto_stcsig);
|
|
|
|
register_dissector("stcsig", dissect_stcsig, proto_stcsig);
|
|
|
|
proto_register_fields(proto_stcsig, hfi, array_length(hfi));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
stcsig_handle = register_dissector(PROTO_SHORT_NAME, dissect_stcsig, proto_stcsig);
|
|
register_postdissector(stcsig_handle);
|
|
|
|
/* STCSIG is a rarely used case, disable it by default for performance reasons. */
|
|
proto_disable_by_default(proto_stcsig);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|