152 lines
4.7 KiB
C
152 lines
4.7 KiB
C
/* packet-symantec.c
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* Routines for dissection of packets from the Axent Raptor firewall/
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* Symantec Enterprise Firewall/Symantec Gateway Security appliance
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* v2/Symantec Gateway Security appliance v3.
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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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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <wiretap/wtap.h>
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#include <epan/etypes.h>
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void proto_register_symantec(void);
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void proto_reg_handoff_symantec(void);
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static dissector_table_t ethertype_dissector_table;
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/* protocols and header fields */
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static int proto_symantec = -1;
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static int hf_symantec_if = -1;
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static int hf_symantec_etype = -1;
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static gint ett_symantec = -1;
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static int
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dissect_symantec(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_item *ti;
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proto_tree *symantec_tree;
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guint16 etypev2, etypev3;
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tvbuff_t *next_tvb;
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/*
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* Symantec records come in two variants:
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*
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* The older variant, dating from Axent days and continuing until
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* the SGS v2.0.1 code level, is 44 bytes long.
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* The first 4 bytes are the IPv4 address of the interface that
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* captured the data, followed by 2 bytes of 0, then an Ethernet
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* type, followed by 36 bytes of 0.
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*
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* The newer variant, introduced either in SGS v3.0 or v3.0.1
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* (possibly in concert with VLAN support), is 56 bytes long.
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* The first 4 bytes are the IPv4 address of the interface that
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* captured the data, followed by 6 bytes of 0, then an Ethernet
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* type, followed by 44 bytes of 0.
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*
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* Unfortunately, there is no flag to distiguish between the two
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* flavours. The only indication of which flavour you have is the
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* offset of the ETHERTYPE field. Fortunately, Symantec didn't
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* use ETHERTYPE_UNK as a valid value.
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*/
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etypev2 = tvb_get_ntohs(tvb, 6);
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etypev3 = tvb_get_ntohs(tvb, 10);
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/* a valid packet can't be both v2 and v3 or neither v2 nor v3, */
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if ((etypev2 == 0) == (etypev3 == 0))
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return 12;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "Symantec");
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if (etypev3 == 0) { /* SEF and SGS v2 processing */
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col_set_str(pinfo->cinfo, COL_INFO, "Symantec Enterprise Firewall");
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ti = proto_tree_add_protocol_format(tree, proto_symantec, tvb,
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0, 44, "Symantec firewall");
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symantec_tree = proto_item_add_subtree(ti, ett_symantec);
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proto_tree_add_item(symantec_tree, hf_symantec_if, tvb,
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0, 4, ENC_BIG_ENDIAN);
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proto_tree_add_uint(symantec_tree, hf_symantec_etype, tvb,
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6, 2, etypev2);
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next_tvb = tvb_new_subset_remaining(tvb, 44);
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dissector_try_uint(ethertype_dissector_table, etypev2, next_tvb, pinfo,
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tree);
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}
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if (etypev2 == 0) { /* SGS v3 processing */
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col_set_str(pinfo->cinfo, COL_INFO, "Symantec SGS v3");
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ti = proto_tree_add_protocol_format(tree, proto_symantec, tvb,
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0, 56, "Symantec SGSv3");
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symantec_tree = proto_item_add_subtree(ti, ett_symantec);
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proto_tree_add_item(symantec_tree, hf_symantec_if, tvb,
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0, 4, ENC_BIG_ENDIAN);
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proto_tree_add_uint(symantec_tree, hf_symantec_etype, tvb,
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10, 2, etypev3);
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/*
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* Dissection of VLAN information will have to wait until
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* availability of a capture file from an SGSv3 box using VLAN
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* tagging.
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*/
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next_tvb = tvb_new_subset_remaining(tvb, 56);
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dissector_try_uint(ethertype_dissector_table, etypev3, next_tvb, pinfo,
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tree);
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}
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return tvb_captured_length(tvb);
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}
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void
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proto_register_symantec(void)
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{
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static hf_register_info hf[] = {
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{ &hf_symantec_if,
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{ "Interface", "symantec.if", FT_IPv4, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_symantec_etype,
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{ "Type", "symantec.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_symantec,
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};
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proto_symantec = proto_register_protocol("Symantec Enterprise Firewall",
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"Symantec", "symantec");
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proto_register_field_array(proto_symantec, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_symantec(void)
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{
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dissector_handle_t symantec_handle;
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ethertype_dissector_table = find_dissector_table("ethertype");
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symantec_handle = create_dissector_handle(dissect_symantec,
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proto_symantec);
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dissector_add_uint("wtap_encap", WTAP_ENCAP_SYMANTEC, symantec_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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