diff options
author | Guy Harris <guy@alum.mit.edu> | 2002-08-08 09:28:11 +0000 |
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committer | Guy Harris <guy@alum.mit.edu> | 2002-08-08 09:28:11 +0000 |
commit | 1882579b7ea2bd587d872428e544d140fcda52f7 (patch) | |
tree | 977ae6f8553c17971cb6a9109c033b6bb3efb868 /packet-fw1.c | |
parent | 48dbb301c8c753e6b8b78c7f48cf2c3cdbb1f126 (diff) |
From Alfred Koebler: support for interpreting Ethernet captures as
CheckPoint FireWall-1 monitor files (those files look like snoop files
for Ethernet).
svn path=/trunk/; revision=5969
Diffstat (limited to 'packet-fw1.c')
-rw-r--r-- | packet-fw1.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/packet-fw1.c b/packet-fw1.c new file mode 100644 index 0000000000..a92ba62b6b --- /dev/null +++ b/packet-fw1.c @@ -0,0 +1,238 @@ +/* packet-fw1.c + * Routines for Ethernet header disassembly of FW1 "monitor" files + * Copyright 2002, Alfred Koebler <ak@icon-sult.de> + * + * $Id: packet-fw1.c,v 1.1 2002/08/08 09:28:08 guy Exp $ + * + * Ethereal - Network traffic analyzer + * By Alfred Koebler <ak@icon-sult.de> + * Copyright 2002 I.Consult + * + * To use this dissector use the command line option + * -o eth.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 ethereal 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 + * + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <string.h> + +#ifdef HAVE_SYS_TYPES_H +# include <sys/types.h> +#endif + +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif + +#include <glib.h> +#include <epan/packet.h> +#include "prefs.h" +#include "etypes.h" + +/* Place FW1 summary in proto tree */ +static gboolean fw1_summary_in_tree = TRUE; + +/* Initialize the protocol and registered fields */ +static int proto_fw1 = -1; +static int hf_fw1_direction = -1; +static int hf_fw1_interface = -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 + +static dissector_handle_t eth_handle; + +void +dissect_fw1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + /* Set up structures needed to add the protocol subtree and manage it */ + proto_item *ti; + proto_tree *volatile fh_tree = NULL; + char direction[3]; + char interface[20]; + guint16 etype; + char header[1000]; + char *p_header; + int i; + int found; + + #define MAX_INTERFACES 20 + static char *p_interfaces[MAX_INTERFACES]; + static int interface_anzahl=0; + + /* Make entries in Protocol column and Info column on summary display */ + if (check_col(pinfo->cinfo, COL_PROTOCOL)) + col_set_str(pinfo->cinfo, COL_PROTOCOL, "FW1"); + if (check_col(pinfo->cinfo, COL_INFO)) + col_clear(pinfo->cinfo, COL_INFO); + + etype = tvb_get_ntohs(tvb, 12); + + if (tree) { + sprintf(header, "FW1 Monitor"); + + /* fetch info to local variable */ + direction[0] = tvb_get_guint8(tvb, 0); + direction[1] = 0; + tvb_get_nstringz0(tvb, 2, 10, interface); + + if (fw1_summary_in_tree) { + /* Known interface name - if not, remember it */ + found=1; + for (i=0; i<interface_anzahl && i<MAX_INTERFACES; i++) { + if ( strcmp(p_interfaces[i], interface) == 0 ) { + found=0; + } + } + if (found == 1 ) { + p_interfaces[interface_anzahl] = strdup(interface); + interface_anzahl++; + } + /* display all interfaces always in the same order */ + for (i=0; i<interface_anzahl; i++) { + found=1; + if ( strcmp(p_interfaces[i], interface) == 0 ) { + found=0; + } + p_header = header + strlen(header); + sprintf(p_header, " %c %s %c", + found==0 ? (direction[0]=='i' ? 'i' : (direction[0]=='O' ? 'O' : ' ')) : ' ', + p_interfaces[i], + found==0 ? (direction[0]=='I' ? 'I' : (direction[0]=='o' ? 'o' : ' ')) : ' ' + ); + } + } else { + /* without FW1 summary delete all remembered names of interfaces */ + for (i=0; i<interface_anzahl && i<MAX_INTERFACES; i++) { + free(p_interfaces[i]); + } + interface_anzahl = 0; + } + + ti = proto_tree_add_protocol_format(tree, proto_fw1, tvb, 0, ETH_HEADER_SIZE, 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, FALSE); + + proto_tree_add_string_format(fh_tree, hf_fw1_interface, + tvb, 2, 10, + interface, "Interface: %s", interface); + } + ethertype(etype, tvb, ETH_HEADER_SIZE, pinfo, tree, fh_tree, hf_fw1_type, + hf_fw1_trailer); +} + +void +proto_register_fw1(void) +{ + static hf_register_info hf[] = { + { &hf_fw1_direction, + { "Direction", "fw1.direction", FT_STRING, BASE_NONE, NULL, 0x0, + "Direction", HFILL }}, + { &hf_fw1_interface, + { "Interface", "fw1.interface", FT_STRING, BASE_NONE, NULL, 0x0, + "Interface", HFILL }}, + /* registered here but handled in ethertype.c */ + { &hf_fw1_type, + { "Type", "fw1.type", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x0, + "", HFILL }}, + }; + /* Setup protocol subtree array */ + static gint *ett[] = { + &ett_fw1, + }; + module_t *fw1_module; + + /* 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, "fw1_summary_in_tree", + "Show FW1 summary in protocol tree", +"Whether the FW1 summary line should be shown in the protocol tree", + &fw1_summary_in_tree); + + register_dissector("fw1", dissect_fw1, proto_fw1); +} + +void +proto_reg_handoff_fw1(void) +{ + /* + * Get handles for the Ethernet dissectors. + */ + eth_handle = find_dissector("eth"); +} |