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+/* packet-fw1.c
+ * Routines for Ethernet header disassembly of FW1 "monitor" files
+ * Copyright 2002,2003, Alfred Koebler <ako@icon.de>
+ * Copyright 2018, Alfred Koebler <Alfred.Koebler2002ATgmx.de>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Alfred Koebler <ako@icon.de>
+ * By Alfred Koebler <Alfred.Koebler2002ATgmx.de>
+ * Copyright 2002,2003,2018 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
+ * e before VPN encryption
+ * E after VPN encryption
+ * - 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 !
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * 30.5.2018
+ * added inspection points "e" and "E"
+ */
+
+#include "config.h"
+
+
+#include <epan/packet.h>
+#include <epan/prefs.h>
+#include <epan/etypes.h>
+
+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_create(pinfo->pool);
+ 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(pinfo->pool, tvb, 2, iface_len, ENC_ASCII|ENC_NA);
+
+ /* Known interface name - if not, remember it */
+ found=FALSE;
+ for (i=0; i<interface_anzahl; i++) {
+ if ( strcmp(p_interfaces[i], interface_name) == 0 ) {
+ found=TRUE;
+ break;
+ }
+ }
+ if (!found && interface_anzahl < MAX_INTERFACES) {
+ p_interfaces[interface_anzahl] = wmem_strdup(wmem_file_scope(), interface_name);
+ interface_anzahl++;
+ }
+
+ /* display all interfaces always in the same order */
+ for (i=0; i<interface_anzahl; i++) {
+ if ( strcmp(p_interfaces[i], interface_name) == 0 ) {
+ wmem_strbuf_append_printf(header, " %c%c %s %c%c",
+ direction == 'i' ? 'i' : (direction == 'O' ? 'O' : (direction == 'E' ? 'E' : ' ') ),
+ (direction == 'i' || direction == 'O' || direction == 'E') ? chain : ' ',
+ p_interfaces[i],
+ direction == 'I' ? 'I' : (direction == 'o' ? 'o' : (direction == 'e' ? 'e' : ' ') ),
+ (direction == 'I' || direction == 'o' || direction == 'e') ? chain : ' '
+ );
+ } else {
+ wmem_strbuf_append_printf(header, " %s ", p_interfaces[i]);
+ }
+ }
+
+ col_add_str(pinfo->cinfo, 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);
+
+ if (fw1_iflist_with_chain)
+ proto_tree_add_item(fh_tree, hf_fw1_chain, tvb, 1, 1, ENC_ASCII);
+
+ proto_tree_add_item(fh_tree, hf_fw1_interface, tvb, 2, iface_len, ENC_ASCII);
+
+ 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);
+ proto_tree_add_uint(fh_tree, hf_fw1_type, tvb, 12, 2, ethertype_data.etype);
+
+ ethertype_data.payload_offset = ETH_HEADER_SIZE;
+ ethertype_data.fh_tree = fh_tree;
+ ethertype_data.trailer_id = hf_fw1_trailer;
+ ethertype_data.fcs_len = 0;
+
+ call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, &ethertype_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<MAX_INTERFACES; i++) {
+ p_interfaces[i] = NULL;
+ }
+ register_init_routine(fw1_init);
+}
+
+void
+proto_reg_handoff_fw1(void)
+{
+ ethertype_handle = find_dissector_add_dependency("ethertype", proto_fw1);
+}
+
+/*
+ * Editor modelines - https://www.wireshark.org/tools/modelines.html
+ *
+ * Local Variables:
+ * c-basic-offset: 2
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=2 tabstop=8 expandtab:
+ * :indentSize=2:tabSize=8:noTabs=true:
+ */
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