/* packet-user_encap.c * Allow users to specify the dissectors for DLTs * Luis E. Garcia Ontanon * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 * * * 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 #include #include #include #include #include #include #ifdef _MSC_VER /* disable: warning C4090: 'XY' : different 'const' qualifiers */ #pragma warning(disable:4090) #endif typedef struct _user_encap_t { guint encap; char* payload_proto_name; dissector_handle_t payload_proto; char* header_proto_name; dissector_handle_t header_proto; char* trailer_proto_name; dissector_handle_t trailer_proto; guint header_size; guint trailer_size; } user_encap_t; #define ENCAP0_STR "User 0 (DLT=147)" static const value_string user_dlts[] = { { WTAP_ENCAP_USER0, ENCAP0_STR}, { WTAP_ENCAP_USER1, "User 1 (DLT=148)"}, { WTAP_ENCAP_USER2, "User 2 (DLT=149)"}, { WTAP_ENCAP_USER3, "User 3 (DLT=150)"}, { WTAP_ENCAP_USER4, "User 4 (DLT=151)"}, { WTAP_ENCAP_USER5, "User 5 (DLT=152)"}, { WTAP_ENCAP_USER6, "User 6 (DLT=153)"}, { WTAP_ENCAP_USER7, "User 7 (DLT=154)"}, { WTAP_ENCAP_USER8, "User 8 (DLT=155)"}, { WTAP_ENCAP_USER9, "User 9 (DLT=156)"}, { WTAP_ENCAP_USER10, "User 10 (DLT=157)"}, { WTAP_ENCAP_USER11, "User 11 (DLT=158)"}, { WTAP_ENCAP_USER12, "User 12 (DLT=159)"}, { WTAP_ENCAP_USER13, "User 13 (DLT=160)"}, { WTAP_ENCAP_USER14, "User 14 (DLT=161)"}, { WTAP_ENCAP_USER15, "User 15 (DLT=162)"}, { 0, NULL } }; static int proto_user_encap = -1; static user_encap_t* encaps = NULL; static guint num_encaps = 0; static uat_t* encaps_uat; static dissector_handle_t data_handle; static void dissect_user(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree) { user_encap_t* encap = NULL; tvbuff_t* payload_tvb; int offset = 0; int len; guint i; for (i = 0; i < num_encaps; i++) { if (encaps[i].encap == pinfo->match_port) { encap = &(encaps[i]); break; } } if (!encap) { char* msg = ep_strdup_printf("user encap not hanlded: DLT=%d, check you Preferences->Protocols->DLT_USER", pinfo->match_port + 147 - WTAP_ENCAP_USER0); proto_item* i = proto_tree_add_text(tree, tvb, 0, 0, msg); expert_add_info_format(pinfo, i, PI_UNDECODED, PI_WARN, msg); call_dissector(data_handle, tvb, pinfo, tree); return; } else { proto_item* i = proto_tree_add_item(tree,proto_user_encap,tvb,0,0,FALSE); proto_item_set_text(i,"DLT: %d",pinfo->match_port + 147 - WTAP_ENCAP_USER0); } len = tvb_reported_length(tvb) - (encap->header_size + encap->trailer_size); if (encap->header_size) { tvbuff_t* hdr_tvb = tvb_new_subset(tvb, 0, encap->header_size, encap->header_size); call_dissector(encap->header_proto, hdr_tvb, pinfo, tree); offset = encap->header_size; } payload_tvb = tvb_new_subset(tvb, encap->header_size, len, len); call_dissector(encap->payload_proto, payload_tvb, pinfo, tree); if (encap->trailer_size) { tvbuff_t* trailer_tvb = tvb_new_subset(tvb, encap->header_size + len, encap->trailer_size, encap->trailer_size); call_dissector(encap->trailer_proto, trailer_tvb, pinfo, tree); offset = encap->trailer_size; } } static void user_update_cb(void* r _U_, const char** err _U_) { } UAT_VS_DEF(user_encap, encap, user_encap_t, WTAP_ENCAP_USER0, ENCAP0_STR) UAT_PROTO_DEF(user_encap, payload_proto, payload_proto, payload_proto_name, user_encap_t) UAT_DEC_CB_DEF(user_encap, header_size, user_encap_t) UAT_DEC_CB_DEF(user_encap, trailer_size, user_encap_t) UAT_PROTO_DEF(user_encap, header_proto, header_proto, header_proto_name, user_encap_t) UAT_PROTO_DEF(user_encap, trailer_proto, trailer_proto, trailer_proto_name, user_encap_t) static dissector_handle_t user_encap_handle; void proto_reg_handoff_user_encap(void) { guint i; user_encap_handle = find_dissector("user_dlt"); data_handle = find_dissector("data"); for (i = WTAP_ENCAP_USER0 ; i <= WTAP_ENCAP_USER15; i++) dissector_add("wtap_encap", i, user_encap_handle); } void proto_register_user_encap(void) { module_t *module; static uat_field_t user_flds[] = { UAT_FLD_VS(user_encap,encap,user_dlts,"The DLT"), UAT_FLD_PROTO(user_encap,payload_proto,"Protocol to be used for the payload of this DLT"), UAT_FLD_DEC(user_encap,header_size,"Size of an eventual header that precedes the actual payload, 0 means none"), UAT_FLD_PROTO(user_encap,header_proto,"Protocol to be used for the header (empty = data)"), UAT_FLD_DEC(user_encap,trailer_size,"Size of an eventual trailer that follows the actual payload, 0 means none"), UAT_FLD_PROTO(user_encap,trailer_proto,"Protocol to be used for the trailer (empty = data)"), UAT_END_FIELDS }; proto_user_encap = proto_register_protocol("DLT User","DLT_USER","user_dlt"); module = prefs_register_protocol(proto_user_encap, NULL); encaps_uat = uat_new("User DLTs Table", sizeof(user_encap_t), "user_dlts", (void**) &encaps, &num_encaps, UAT_CAT_FFMT, "ChUserDLTsSection", NULL, user_update_cb, NULL, user_flds ); prefs_register_uat_preference(module, "encaps_table", "Encapsulations Table", "A table that enumerates the various protocols to be used against a cartain user DLT", encaps_uat); register_dissector("user_dlt",dissect_user,proto_user_encap); /* prefs_register_protocol_obsolete(proto_register_protocol("DLT User A","DLT_USER_A","user_dlt_a")); prefs_register_protocol_obsolete(proto_register_protocol("DLT User B","DLT_USER_B","user_dlt_b")); prefs_register_protocol_obsolete(proto_register_protocol("DLT User C","DLT_USER_C","user_dlt_c")); prefs_register_protocol_obsolete(proto_register_protocol("DLT User D","DLT_USER_D","user_dlt_d")); */ }