/* packet-fw1.c * Routines for Ethernet header disassembly of FW1 "monitor" files * Copyright 2002,2003, Alfred Koebler * * Wireshark - Network traffic analyzer * By Alfred Koebler * Copyright 2002,2003 Alfred Koebler * * To use this dissector use the command line option * -o eth.interpret_as_fw1_monitor:TRUE * * At the moment the way with the option is the best one. * A automatic way is not possible, because the file format isn't different * to the snoop file. * * With "fw monitor" it is possible to collect packets on several places. * The additional information: * - is it a incoming or outgoing packet * - is it before or after the firewall * i incoming before the firewall * I incoming after the firewall * o outcoming before the firewall * O outcoming after the firewall * - the name of the interface * * What's the problem ? * Think about one packet traveling across the firewall. * With wireshark you will see 4 lines in the Top Pane. * To analyze a problem it is helpful to see the additional information * in the protocol tree of the Middle Pane. * * The presentation of the summary line is designed in the following way: * Every time the next selected packet in the Top Pane includes a * "new" interface name the name is added to the list in the summary line. * The interface names are listed one after the other. * The position of the interface names didn't change. * * And who are the 4 places represented ? * The interface name represents the firewall module of the interface. * On the left side of the interface name is the interface module. * On the right side of the interface name is the "IP" module. * * Example for a ping from the firewall to another host: * For the four lines in the Top Pane you will see the according lines * in the Middle Pane: * El90x1 o * O El90x1 * i El90x1 * El90x1 I * * Example for a packet traversing through the Firewall, first through * the inner side firewall module then through the outer side firewall module: * i El90x1 El90x2 * El90x1 I El90x2 * El90x1 o E190x2 * El90x1 E190x2 O * * 9.12.2002 * Add new column with summary of FW-1 interface/direction * * 11.8.2003 * Additional interpretation of field Chain Position. * Show the chain position in the interface list. * Support for new format of fw monitor file * writen by option -u | -s for UUID/SUUID. * NOTICE: First paket will have UUID == 0 ! * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include #include #include void proto_register_fw1(void); void proto_reg_handoff_fw1(void); /* Place FW1 summary in proto tree */ static gboolean fw1_summary_in_tree = TRUE; static gboolean fw1_with_uuid = FALSE; static gboolean fw1_iflist_with_chain = FALSE; static dissector_handle_t ethertype_handle; /* Initialize the protocol and registered fields */ static int proto_fw1 = -1; static int hf_fw1_direction = -1; static int hf_fw1_chain = -1; static int hf_fw1_interface = -1; static int hf_fw1_uuid = -1; static int hf_fw1_type = -1; static int hf_fw1_trailer = -1; /* Initialize the subtree pointers */ static gint ett_fw1 = -1; #define ETH_HEADER_SIZE 14 #define MAX_INTERFACES 20 static gchar *p_interfaces[MAX_INTERFACES]; static int interface_anzahl=0; static void fw1_init(void) { interface_anzahl = 0; } static int dissect_fw1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { /* Set up structures needed to add the protocol subtree and manage it */ proto_item *ti; proto_tree *fh_tree = NULL; char direction; char chain; char *interface_name; guint32 iface_len = 10; wmem_strbuf_t *header; int i; gboolean found; static const char fw1_header[] = "FW1 Monitor"; ethertype_data_t ethertype_data; header = wmem_strbuf_new_label(wmem_packet_scope()); wmem_strbuf_append(header, fw1_header); /* Make entries in Protocol column and Info column on summary display */ col_set_str(pinfo->cinfo, COL_PROTOCOL, "FW1"); col_clear(pinfo->cinfo, COL_INFO); /* fetch info to local variable */ direction = tvb_get_guint8(tvb, 0); if (!fw1_iflist_with_chain) chain = ' '; else chain = tvb_get_guint8(tvb, 1); if (fw1_with_uuid) iface_len = 6; interface_name=tvb_get_stringzpad(wmem_packet_scope(), tvb, 2, iface_len, ENC_ASCII|ENC_NA); /* Known interface name - if not, remember it */ found=FALSE; for (i=0; icinfo, COL_IF_DIR, wmem_strbuf_get_str(header) + sizeof(fw1_header) + 1); if (tree) { if (!fw1_summary_in_tree) /* Do not show the summary in Protocol Tree */ ti = proto_tree_add_protocol_format(tree, proto_fw1, tvb, 0, ETH_HEADER_SIZE, "%s", fw1_header); else ti = proto_tree_add_protocol_format(tree, proto_fw1, tvb, 0, ETH_HEADER_SIZE, "%s", wmem_strbuf_get_str(header)); /* create display subtree for the protocol */ fh_tree = proto_item_add_subtree(ti, ett_fw1); proto_tree_add_item(fh_tree, hf_fw1_direction, tvb, 0, 1, ENC_ASCII|ENC_NA); if (fw1_iflist_with_chain) proto_tree_add_item(fh_tree, hf_fw1_chain, tvb, 1, 1, ENC_ASCII|ENC_NA); proto_tree_add_item(fh_tree, hf_fw1_interface, tvb, 2, iface_len, ENC_ASCII|ENC_NA); if (fw1_with_uuid) proto_tree_add_item(fh_tree, hf_fw1_uuid, tvb, 8, 4, ENC_BIG_ENDIAN); } ethertype_data.etype = tvb_get_ntohs(tvb, 12); ethertype_data.offset_after_ethertype = ETH_HEADER_SIZE; ethertype_data.fh_tree = fh_tree; ethertype_data.etype_id = hf_fw1_type; ethertype_data.trailer_id = hf_fw1_trailer; ethertype_data.fcs_len = 0; call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data); return tvb_captured_length(tvb); } void proto_register_fw1(void) { static hf_register_info hf[] = { { &hf_fw1_direction, { "Direction", "fw1.direction", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_fw1_chain, { "Chain Position", "fw1.chain", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_fw1_interface, { "Interface", "fw1.interface", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_fw1_uuid, { "UUID", "fw1.uuid", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }}, /* registered here but handled in ethertype.c */ { &hf_fw1_type, { "Type", "fw1.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, NULL, HFILL }}, { &hf_fw1_trailer, { "Trailer", "fw1.trailer", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } } }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_fw1, }; module_t *fw1_module; int i; /* Register the protocol name and description */ proto_fw1 = proto_register_protocol("Checkpoint FW-1", "FW-1", "fw1"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_fw1, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); /* Register configuration preferences */ fw1_module = prefs_register_protocol(proto_fw1, NULL); prefs_register_bool_preference(fw1_module, "summary_in_tree", "Show FireWall-1 summary in protocol tree", "Whether the FireWall-1 summary line should be shown in the protocol tree", &fw1_summary_in_tree); prefs_register_bool_preference(fw1_module, "with_uuid", "Monitor file includes UUID", "Whether the Firewall-1 monitor file includes UUID information", &fw1_with_uuid); prefs_register_bool_preference(fw1_module, "iflist_with_chain", "Interface list includes chain position", "Whether the interface list includes the chain position", &fw1_iflist_with_chain); register_dissector("fw1", dissect_fw1, proto_fw1); for (i=0; i