forked from osmocom/wireshark
219 lines
7.0 KiB
C
219 lines
7.0 KiB
C
/* packet-user_encap.c
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* Allow users to specify the dissectors for DLTs
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* Luis E. Garcia Ontanon <luis@ontanon.org>
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*
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* $Id$
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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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* Copyright 1998
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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#include <epan/uat.h>
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#include <epan/emem.h>
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#ifdef _MSC_VER
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/* disable: warning C4090: 'XY' : different 'const' qualifiers */
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#pragma warning(disable:4090)
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#endif
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typedef struct _user_encap_t {
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guint encap;
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char* payload_proto_name;
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dissector_handle_t payload_proto;
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char* header_proto_name;
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dissector_handle_t header_proto;
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char* trailer_proto_name;
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dissector_handle_t trailer_proto;
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guint header_size;
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guint trailer_size;
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} user_encap_t;
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#define ENCAP0_STR "User 0 (DLT=147)"
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static const value_string user_dlts[] = {
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{ WTAP_ENCAP_USER0, ENCAP0_STR},
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{ WTAP_ENCAP_USER1, "User 1 (DLT=148)"},
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{ WTAP_ENCAP_USER2, "User 2 (DLT=149)"},
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{ WTAP_ENCAP_USER3, "User 3 (DLT=150)"},
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{ WTAP_ENCAP_USER4, "User 4 (DLT=151)"},
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{ WTAP_ENCAP_USER5, "User 5 (DLT=152)"},
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{ WTAP_ENCAP_USER6, "User 6 (DLT=153)"},
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{ WTAP_ENCAP_USER7, "User 7 (DLT=154)"},
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{ WTAP_ENCAP_USER8, "User 8 (DLT=155)"},
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{ WTAP_ENCAP_USER9, "User 9 (DLT=156)"},
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{ WTAP_ENCAP_USER10, "User 10 (DLT=157)"},
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{ WTAP_ENCAP_USER11, "User 11 (DLT=158)"},
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{ WTAP_ENCAP_USER12, "User 12 (DLT=159)"},
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{ WTAP_ENCAP_USER13, "User 13 (DLT=160)"},
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{ WTAP_ENCAP_USER14, "User 14 (DLT=161)"},
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{ WTAP_ENCAP_USER15, "User 15 (DLT=162)"},
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{ 0, NULL }
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};
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static int proto_user_encap = -1;
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static user_encap_t* encaps = NULL;
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static guint num_encaps = 0;
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static uat_t* encaps_uat;
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static dissector_handle_t data_handle;
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static void dissect_user(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree) {
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user_encap_t* encap = NULL;
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tvbuff_t* payload_tvb;
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int offset = 0;
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int len;
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guint i;
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for (i = 0; i < num_encaps; i++) {
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if (encaps[i].encap == pinfo->match_port) {
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encap = &(encaps[i]);
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break;
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}
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}
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if (!encap) {
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char* msg = ep_strdup_printf("User encapsulation not handled: DLT=%d, check your Preferences->Protocols->DLT_USER",
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pinfo->match_port + 147 - WTAP_ENCAP_USER0);
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proto_item* item = proto_tree_add_text(tree, tvb, 0, 0, "%s", msg);
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expert_add_info_format(pinfo, item, PI_UNDECODED, PI_WARN, "%s", msg);
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call_dissector(data_handle, tvb, pinfo, tree);
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return;
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} else {
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proto_item* item = proto_tree_add_item(tree,proto_user_encap,tvb,0,0,FALSE);
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proto_item_set_text(item,"DLT: %d",pinfo->match_port + 147 - WTAP_ENCAP_USER0);
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}
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len = tvb_reported_length(tvb) - (encap->header_size + encap->trailer_size);
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if (encap->header_size) {
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tvbuff_t* hdr_tvb = tvb_new_subset(tvb, 0, encap->header_size, encap->header_size);
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call_dissector(encap->header_proto, hdr_tvb, pinfo, tree);
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offset = encap->header_size;
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}
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payload_tvb = tvb_new_subset(tvb, encap->header_size, len, len);
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call_dissector(encap->payload_proto, payload_tvb, pinfo, tree);
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if (encap->trailer_size) {
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tvbuff_t* trailer_tvb = tvb_new_subset(tvb, encap->header_size + len, encap->trailer_size, encap->trailer_size);
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call_dissector(encap->trailer_proto, trailer_tvb, pinfo, tree);
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offset = encap->trailer_size;
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}
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}
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static void* user_copy_cb(void* dest, const void* orig, unsigned len _U_)
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{
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const user_encap_t *o = orig;
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user_encap_t *d = dest;
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d->payload_proto_name = g_strdup(o->payload_proto_name);
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d->header_proto_name = g_strdup(o->header_proto_name);
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d->trailer_proto_name = g_strdup(o->trailer_proto_name);
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return d;
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}
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static void user_free_cb(void* record)
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{
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user_encap_t *u = record;
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g_free(u->payload_proto_name);
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g_free(u->header_proto_name);
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g_free(u->trailer_proto_name);
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}
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UAT_VS_DEF(user_encap, encap, user_encap_t, WTAP_ENCAP_USER0, ENCAP0_STR)
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UAT_PROTO_DEF(user_encap, payload_proto, payload_proto, payload_proto_name, user_encap_t)
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UAT_DEC_CB_DEF(user_encap, header_size, user_encap_t)
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UAT_DEC_CB_DEF(user_encap, trailer_size, user_encap_t)
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UAT_PROTO_DEF(user_encap, header_proto, header_proto, header_proto_name, user_encap_t)
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UAT_PROTO_DEF(user_encap, trailer_proto, trailer_proto, trailer_proto_name, user_encap_t)
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void proto_reg_handoff_user_encap(void)
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{
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dissector_handle_t user_encap_handle;
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guint i;
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user_encap_handle = find_dissector("user_dlt");
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data_handle = find_dissector("data");
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for (i = WTAP_ENCAP_USER0 ; i <= WTAP_ENCAP_USER15; i++)
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dissector_add("wtap_encap", i, user_encap_handle);
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}
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void proto_register_user_encap(void)
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{
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module_t *module;
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static uat_field_t user_flds[] = {
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UAT_FLD_VS(user_encap,encap,"DLT",user_dlts,"The DLT"),
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UAT_FLD_PROTO(user_encap,payload_proto,"Payload protocol","Protocol to be used for the payload of this DLT"),
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UAT_FLD_DEC(user_encap,header_size,"Header size","Size of an eventual header that precedes the actual payload, 0 means none"),
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UAT_FLD_PROTO(user_encap,header_proto,"Header protocol","Protocol to be used for the header (empty = data)"),
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UAT_FLD_DEC(user_encap,trailer_size,"Trailer size","Size of an eventual trailer that follows the actual payload, 0 means none"),
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UAT_FLD_PROTO(user_encap,trailer_proto,"Trailer protocol","Protocol to be used for the trailer (empty = data)"),
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UAT_END_FIELDS
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};
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proto_user_encap = proto_register_protocol("DLT User","DLT_USER","user_dlt");
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module = prefs_register_protocol(proto_user_encap, NULL);
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encaps_uat = uat_new("User DLTs Table",
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sizeof(user_encap_t),
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"user_dlts",
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TRUE,
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(void**) &encaps,
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&num_encaps,
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UAT_CAT_FFMT,
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"ChUserDLTsSection",
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user_copy_cb,
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NULL,
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user_free_cb,
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user_flds );
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prefs_register_uat_preference(module,
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"encaps_table",
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"Encapsulations Table",
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"A table that enumerates the various protocols to be used against a certain user DLT",
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encaps_uat);
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register_dissector("user_dlt",dissect_user,proto_user_encap);
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/*
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prefs_register_protocol_obsolete(proto_register_protocol("DLT User A","DLT_USER_A","user_dlt_a"));
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prefs_register_protocol_obsolete(proto_register_protocol("DLT User B","DLT_USER_B","user_dlt_b"));
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prefs_register_protocol_obsolete(proto_register_protocol("DLT User C","DLT_USER_C","user_dlt_c"));
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prefs_register_protocol_obsolete(proto_register_protocol("DLT User D","DLT_USER_D","user_dlt_d"));
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*/
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}
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