215 lines
8 KiB
C
215 lines
8 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@gmail.com>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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 <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/report_err.h>
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#include <epan/dissectors/packet-sscop.h>
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typedef void (*encap_dissector_t)(tvbuff_t*,packet_info*,proto_tree*,dissector_handle_t);
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typedef struct _user_encap_t {
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guint wtap_encap;
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guint last_encap;
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const gchar* name;
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const gchar* abbr;
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const gchar* long_name;
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const gchar* payload;
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const gchar* header;
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const gchar* trailer;
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guint header_size;
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guint trailer_size;
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int hfid;
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gint special_encap;
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encap_dissector_t encap_dissector;
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dissector_t dissector;
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module_t* module;
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dissector_handle_t handle;
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dissector_handle_t payload_handle;
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dissector_handle_t header_handle;
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dissector_handle_t trailer_handle;
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} user_encap_t;
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static const enum_val_t user_dlts[] = {
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{ "Disabled", "Disabled", 0 },
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{ "USER00", "User 0 (DLT=147 WTAP_ENCAP=45)", WTAP_ENCAP_USER0 },
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{ "USER01", "User 1 (DLT=148 WTAP_ENCAP=46)", WTAP_ENCAP_USER1 },
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{ "USER02", "User 2 (DLT=149 WTAP_ENCAP=47)", WTAP_ENCAP_USER2 },
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{ "USER03", "User 3 (DLT=150 WTAP_ENCAP=48)", WTAP_ENCAP_USER3 },
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{ "USER04", "User 4 (DLT=151 WTAP_ENCAP=49)", WTAP_ENCAP_USER4 },
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{ "USER05", "User 5 (DLT=152 WTAP_ENCAP=50)", WTAP_ENCAP_USER5 },
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{ "USER06", "User 6 (DLT=153 WTAP_ENCAP=51)", WTAP_ENCAP_USER6 },
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{ "USER07", "User 7 (DLT=154 WTAP_ENCAP=52)", WTAP_ENCAP_USER7 },
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{ "USER08", "User 8 (DLT=155 WTAP_ENCAP=53)", WTAP_ENCAP_USER8 },
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{ "USER09", "User 9 (DLT=156 WTAP_ENCAP=54)", WTAP_ENCAP_USER9 },
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{ "USER10", "User 10 (DLT=157 WTAP_ENCAP=55)", WTAP_ENCAP_USER10 },
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{ "USER11", "User 11 (DLT=158 WTAP_ENCAP=56)", WTAP_ENCAP_USER11 },
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{ "USER12", "User 12 (DLT=159 WTAP_ENCAP=57)", WTAP_ENCAP_USER12 },
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{ "USER13", "User 13 (DLT=160 WTAP_ENCAP=58)", WTAP_ENCAP_USER13 },
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{ "USER14", "User 14 (DLT=161 WTAP_ENCAP=59)", WTAP_ENCAP_USER14 },
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{ "USER15", "User 15 (DLT=162 WTAP_ENCAP=60)", WTAP_ENCAP_USER15 },
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{ NULL, NULL, 0 }
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};
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static const enum_val_t encap_types[] = {
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{ "None", "No encpsulation", 0 },
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{ "SSCOP" , "SSCOP", 1 },
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{ NULL, NULL, 0 }
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};
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static const encap_dissector_t encap_dissectors[] = {
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NULL,
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dissect_sscop_and_payload
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};
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static void dissect_user(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree,guint id);
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static void dissect_user_a(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree) { dissect_user(tvb,pinfo,tree,0); }
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static void dissect_user_b(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree) { dissect_user(tvb,pinfo,tree,1); }
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static void dissect_user_c(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree) { dissect_user(tvb,pinfo,tree,2); }
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static void dissect_user_d(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree) { dissect_user(tvb,pinfo,tree,3); }
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user_encap_t encaps[] = {
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{0,0,"DLT_USER_A","user_dlt_a","DLT User A","","","",0,0,-1,0,NULL,dissect_user_a,NULL,NULL,NULL,NULL,NULL},
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{0,0,"DLT_USER_B","user_dlt_b","DLT User B","","","",0,0,-1,0,NULL,dissect_user_b,NULL,NULL,NULL,NULL,NULL},
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{0,0,"DLT_USER_C","user_dlt_c","DLT User C","","","",0,0,-1,0,NULL,dissect_user_c,NULL,NULL,NULL,NULL,NULL},
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{0,0,"DLT_USER_D","user_dlt_d","DLT User D","","","",0,0,-1,0,NULL,dissect_user_d,NULL,NULL,NULL,NULL,NULL},
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};
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static void dissect_user(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree,guint id) {
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user_encap_t* encap = &(encaps[id]);
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tvbuff_t* payload_tvb;
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int offset = 0;
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int len = tvb_reported_length(tvb) - (encap->header_size + encap->trailer_size);
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if (encap->encap_dissector) {
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encap->encap_dissector(tvb,pinfo,tree,encap->payload_handle);
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return;
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}
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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_handle, 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_handle, 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_handle, trailer_tvb, pinfo, tree);
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offset = encap->trailer_size;
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}
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}
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void proto_reg_handoff_user_encap(void) {
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guint i;
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static dissector_handle_t data_handle;
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data_handle = find_dissector("data");
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for (i = 0; i < array_length(encaps); i++) {
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if(encaps[i].last_encap)
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dissector_delete("wtap_encap", encaps[i].last_encap, encaps[i].handle);
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if (encaps[i].wtap_encap) {
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encaps[i].handle = find_dissector(encaps[i].abbr);
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dissector_add("wtap_encap", encaps[i].wtap_encap, encaps[i].handle);
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encaps[i].last_encap = encaps[i].wtap_encap;
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if(*(encaps[i].payload) != '\0') {
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encaps[i].payload_handle = find_dissector(encaps[i].payload);
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if (encaps[i].payload_handle == NULL) {
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encaps[i].payload_handle = data_handle;
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report_failure("%s: No such proto: %s",encaps[i].long_name,encaps[i].payload);
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}
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} else {
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encaps[i].payload_handle = data_handle;
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}
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if(*(encaps[i].header) != '\0') {
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encaps[i].header_handle = find_dissector(encaps[i].header);
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if (encaps[i].header_handle == NULL) {
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encaps[i].header_handle = data_handle;
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report_failure("%s: No such proto: %s",encaps[i].long_name,encaps[i].header);
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}
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} else {
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encaps[i].header_handle = data_handle;
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}
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if(*(encaps[i].trailer) != '\0') {
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encaps[i].trailer_handle = find_dissector(encaps[i].trailer);
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if (encaps[i].trailer_handle == NULL) {
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encaps[i].trailer_handle = data_handle;
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report_failure("%s: No such proto: %s",encaps[i].long_name,encaps[i].trailer);
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}
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} else {
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encaps[i].trailer_handle = data_handle;
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}
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encaps[i].encap_dissector = encap_dissectors[encaps[i].special_encap];
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}
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}
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}
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void proto_register_user_encap(void)
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{
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int i;
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for (i = 0; i < array_length(encaps); i++) {
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encaps[i].hfid = proto_register_protocol(encaps[i].name, encaps[i].long_name, encaps[i].abbr);
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encaps[i].module = prefs_register_protocol(encaps[i].hfid, proto_reg_handoff_user_encap);
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prefs_register_enum_preference(encaps[i].module, "dlt","DLT", "Data Link Type", &(encaps[i].wtap_encap), user_dlts, FALSE);
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prefs_register_enum_preference(encaps[i].module, "special_encap","Special Encapsulation", "", &(encaps[i].special_encap), encap_types, FALSE);
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prefs_register_string_preference(encaps[i].module, "payload","Payload", "Payload", (const char **) &(encaps[i].payload));
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prefs_register_uint_preference(encaps[i].module, "header_size","Header Size", "The size (in octets) of the Header", 10, &(encaps[i].header_size));
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prefs_register_uint_preference(encaps[i].module, "trailer_size","Trailer Size", "The size (in octets) of the Trailer", 10, &(encaps[i].trailer_size));
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prefs_register_string_preference(encaps[i].module, "header_proto","Header Protocol", "Header Protocol (used only when ecapsulation is not given)", (const char **)&(encaps[i].header));
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prefs_register_string_preference(encaps[i].module, "trailer_proto","Trailer Protocol", "Trailer Protocol (used only when ecapsulation is not given)", (const char **)&(encaps[i].trailer));
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register_dissector(encaps[i].abbr, encaps[i].dissector, encaps[i].hfid);
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}
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}
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