forked from osmocom/wireshark
302 lines
9.8 KiB
C
302 lines
9.8 KiB
C
/* packet-fw1.c
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* Routines for Ethernet header disassembly of FW1 "monitor" files
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* Copyright 2002,2003, Alfred Koebler <ako@icon.de>
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* Copyright 2018, Alfred Koebler <Alfred.Koebler2002ATgmx.de>
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*
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* Wireshark - Network traffic analyzer
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* By Alfred Koebler <ako@icon.de>
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* By Alfred Koebler <Alfred.Koebler2002ATgmx.de>
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* Copyright 2002,2003,2018 Alfred Koebler
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*
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* To use this dissector use the command line option
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* -o eth.interpret_as_fw1_monitor:TRUE
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*
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* At the moment the way with the option is the best one.
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* A automatic way is not possible, because the file format isn't different
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* to the snoop file.
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*
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* With "fw monitor" it is possible to collect packets on several places.
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* The additional information:
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* - is it a incoming or outgoing packet
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* - is it before or after the firewall
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* i incoming before the firewall
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* I incoming after the firewall
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* o outcoming before the firewall
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* O outcoming after the firewall
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* e before VPN encryption
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* E after VPN encryption
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* - the name of the interface
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*
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* What's the problem ?
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* Think about one packet traveling across the firewall.
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* With wireshark you will see 4 lines in the Top Pane.
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* To analyze a problem it is helpful to see the additional information
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* in the protocol tree of the Middle Pane.
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*
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* The presentation of the summary line is designed in the following way:
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* Every time the next selected packet in the Top Pane includes a
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* "new" interface name the name is added to the list in the summary line.
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* The interface names are listed one after the other.
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* The position of the interface names didn't change.
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*
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* And who are the 4 places represented ?
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* The interface name represents the firewall module of the interface.
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* On the left side of the interface name is the interface module.
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* On the right side of the interface name is the "IP" module.
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*
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* Example for a ping from the firewall to another host:
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* For the four lines in the Top Pane you will see the according lines
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* in the Middle Pane:
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* El90x1 o
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* O El90x1
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* i El90x1
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* El90x1 I
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*
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* Example for a packet traversing through the Firewall, first through
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* the inner side firewall module then through the outer side firewall module:
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* i El90x1 El90x2
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* El90x1 I El90x2
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* El90x1 o E190x2
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* El90x1 E190x2 O
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*
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* 9.12.2002
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* Add new column with summary of FW-1 interface/direction
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*
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* 11.8.2003
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* Additional interpretation of field Chain Position.
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* Show the chain position in the interface list.
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* Support for new format of fw monitor file
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* writen by option -u | -s for UUID/SUUID.
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* NOTICE: First paket will have UUID == 0 !
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* 30.5.2018
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* added inspection points "e" and "E"
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/etypes.h>
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void proto_register_fw1(void);
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void proto_reg_handoff_fw1(void);
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/* Place FW1 summary in proto tree */
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static gboolean fw1_summary_in_tree = TRUE;
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static gboolean fw1_with_uuid = FALSE;
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static gboolean fw1_iflist_with_chain = FALSE;
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static dissector_handle_t ethertype_handle;
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/* Initialize the protocol and registered fields */
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static int proto_fw1 = -1;
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static int hf_fw1_direction = -1;
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static int hf_fw1_chain = -1;
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static int hf_fw1_interface = -1;
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static int hf_fw1_uuid = -1;
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static int hf_fw1_type = -1;
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static int hf_fw1_trailer = -1;
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/* Initialize the subtree pointers */
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static gint ett_fw1 = -1;
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#define ETH_HEADER_SIZE 14
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#define MAX_INTERFACES 20
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static gchar *p_interfaces[MAX_INTERFACES];
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static int interface_anzahl=0;
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static void
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fw1_init(void)
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{
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interface_anzahl = 0;
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}
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static int
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dissect_fw1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *ti;
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proto_tree *fh_tree = NULL;
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char direction;
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char chain;
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char *interface_name;
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guint32 iface_len = 10;
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wmem_strbuf_t *header;
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int i;
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gboolean found;
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static const char fw1_header[] = "FW1 Monitor";
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ethertype_data_t ethertype_data;
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header = wmem_strbuf_new_label(pinfo->pool);
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wmem_strbuf_append(header, fw1_header);
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/* Make entries in Protocol column and Info column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FW1");
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col_clear(pinfo->cinfo, COL_INFO);
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/* fetch info to local variable */
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direction = tvb_get_guint8(tvb, 0);
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if (!fw1_iflist_with_chain)
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chain = ' ';
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else
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chain = tvb_get_guint8(tvb, 1);
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if (fw1_with_uuid)
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iface_len = 6;
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interface_name=tvb_get_stringzpad(pinfo->pool, tvb, 2, iface_len, ENC_ASCII|ENC_NA);
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/* Known interface name - if not, remember it */
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found=FALSE;
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for (i=0; i<interface_anzahl; i++) {
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if ( strcmp(p_interfaces[i], interface_name) == 0 ) {
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found=TRUE;
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break;
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}
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}
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if (!found && interface_anzahl < MAX_INTERFACES) {
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p_interfaces[interface_anzahl] = wmem_strdup(wmem_file_scope(), interface_name);
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interface_anzahl++;
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}
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/* display all interfaces always in the same order */
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for (i=0; i<interface_anzahl; i++) {
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if ( strcmp(p_interfaces[i], interface_name) == 0 ) {
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wmem_strbuf_append_printf(header, " %c%c %s %c%c",
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direction == 'i' ? 'i' : (direction == 'O' ? 'O' : (direction == 'E' ? 'E' : ' ') ),
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(direction == 'i' || direction == 'O' || direction == 'E') ? chain : ' ',
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p_interfaces[i],
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direction == 'I' ? 'I' : (direction == 'o' ? 'o' : (direction == 'e' ? 'e' : ' ') ),
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(direction == 'I' || direction == 'o' || direction == 'e') ? chain : ' '
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);
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} else {
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wmem_strbuf_append_printf(header, " %s ", p_interfaces[i]);
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}
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}
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col_add_str(pinfo->cinfo, COL_IF_DIR, wmem_strbuf_get_str(header) + sizeof(fw1_header) + 1);
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if (tree) {
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if (!fw1_summary_in_tree)
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/* Do not show the summary in Protocol Tree */
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ti = proto_tree_add_protocol_format(tree, proto_fw1, tvb, 0, ETH_HEADER_SIZE, "%s", fw1_header);
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else
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ti = proto_tree_add_protocol_format(tree, proto_fw1, tvb, 0, ETH_HEADER_SIZE, "%s", wmem_strbuf_get_str(header));
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/* create display subtree for the protocol */
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fh_tree = proto_item_add_subtree(ti, ett_fw1);
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proto_tree_add_item(fh_tree, hf_fw1_direction, tvb, 0, 1, ENC_ASCII|ENC_NA);
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if (fw1_iflist_with_chain)
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proto_tree_add_item(fh_tree, hf_fw1_chain, tvb, 1, 1, ENC_ASCII|ENC_NA);
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proto_tree_add_item(fh_tree, hf_fw1_interface, tvb, 2, iface_len, ENC_ASCII|ENC_NA);
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if (fw1_with_uuid)
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proto_tree_add_item(fh_tree, hf_fw1_uuid, tvb, 8, 4, ENC_BIG_ENDIAN);
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}
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ethertype_data.etype = tvb_get_ntohs(tvb, 12);
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proto_tree_add_uint(fh_tree, hf_fw1_type, tvb, 12, 2, ethertype_data.etype);
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ethertype_data.payload_offset = ETH_HEADER_SIZE;
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ethertype_data.fh_tree = fh_tree;
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ethertype_data.trailer_id = hf_fw1_trailer;
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ethertype_data.fcs_len = 0;
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call_dissector_with_data(ethertype_handle, tvb, pinfo, tree, ðertype_data);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_fw1(void)
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{
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static hf_register_info hf[] = {
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{ &hf_fw1_direction,
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{ "Direction", "fw1.direction", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_fw1_chain,
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{ "Chain Position", "fw1.chain", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_fw1_interface,
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{ "Interface", "fw1.interface", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_fw1_uuid,
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{ "UUID", "fw1.uuid", FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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/* registered here but handled in ethertype.c */
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{ &hf_fw1_type,
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{ "Type", "fw1.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0,
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NULL, HFILL }},
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{ &hf_fw1_trailer,
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{ "Trailer", "fw1.trailer", FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }
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}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_fw1,
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};
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module_t *fw1_module;
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int i;
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/* Register the protocol name and description */
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proto_fw1 = proto_register_protocol("Checkpoint FW-1", "FW-1", "fw1");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_fw1, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register configuration preferences */
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fw1_module = prefs_register_protocol(proto_fw1, NULL);
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prefs_register_bool_preference(fw1_module, "summary_in_tree",
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"Show FireWall-1 summary in protocol tree",
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"Whether the FireWall-1 summary line should be shown in the protocol tree",
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&fw1_summary_in_tree);
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prefs_register_bool_preference(fw1_module, "with_uuid",
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"Monitor file includes UUID",
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"Whether the Firewall-1 monitor file includes UUID information",
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&fw1_with_uuid);
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prefs_register_bool_preference(fw1_module, "iflist_with_chain",
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"Interface list includes chain position",
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"Whether the interface list includes the chain position",
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&fw1_iflist_with_chain);
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register_dissector("fw1", dissect_fw1, proto_fw1);
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for (i=0; i<MAX_INTERFACES; i++) {
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p_interfaces[i] = NULL;
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}
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register_init_routine(fw1_init);
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}
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void
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proto_reg_handoff_fw1(void)
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{
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ethertype_handle = find_dissector_add_dependency("ethertype", proto_fw1);
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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: 2
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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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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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