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wireshark/epan/dissectors/packet-user_encap.c

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/* packet-user_encap.c
* Allow users to specify the dissectors for DLTs
* Luis E. Garcia Ontanon <luis.ontanon@gmail.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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 <glib.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/report_err.h>
#include <epan/dissectors/packet-sscop.h>
typedef void (*encap_dissector_t)(tvbuff_t*,packet_info*,proto_tree*,dissector_handle_t);
typedef struct _user_encap_t {
guint wtap_encap;
guint last_encap;
const gchar* name;
const gchar* abbr;
const gchar* long_name;
const gchar* payload;
const gchar* header;
const gchar* trailer;
guint header_size;
guint trailer_size;
int hfid;
gint special_encap;
encap_dissector_t encap_dissector;
dissector_t dissector;
module_t* module;
dissector_handle_t handle;
dissector_handle_t payload_handle;
dissector_handle_t header_handle;
dissector_handle_t trailer_handle;
} user_encap_t;
static const enum_val_t user_dlts[] = {
{ "Disabled", "Disabled", 0 },
{ "USER00", "User 0 (DLT=147 WTAP_ENCAP=45)", WTAP_ENCAP_USER0 },
{ "USER01", "User 1 (DLT=148 WTAP_ENCAP=46)", WTAP_ENCAP_USER1 },
{ "USER02", "User 2 (DLT=149 WTAP_ENCAP=47)", WTAP_ENCAP_USER2 },
{ "USER03", "User 3 (DLT=150 WTAP_ENCAP=48)", WTAP_ENCAP_USER3 },
{ "USER04", "User 4 (DLT=151 WTAP_ENCAP=49)", WTAP_ENCAP_USER4 },
{ "USER05", "User 5 (DLT=152 WTAP_ENCAP=50)", WTAP_ENCAP_USER5 },
{ "USER06", "User 6 (DLT=153 WTAP_ENCAP=51)", WTAP_ENCAP_USER6 },
{ "USER07", "User 7 (DLT=154 WTAP_ENCAP=52)", WTAP_ENCAP_USER7 },
{ "USER08", "User 8 (DLT=155 WTAP_ENCAP=53)", WTAP_ENCAP_USER8 },
{ "USER09", "User 9 (DLT=156 WTAP_ENCAP=54)", WTAP_ENCAP_USER9 },
{ "USER10", "User 10 (DLT=157 WTAP_ENCAP=55)", WTAP_ENCAP_USER10 },
{ "USER11", "User 11 (DLT=158 WTAP_ENCAP=56)", WTAP_ENCAP_USER11 },
{ "USER12", "User 12 (DLT=159 WTAP_ENCAP=57)", WTAP_ENCAP_USER12 },
{ "USER13", "User 13 (DLT=160 WTAP_ENCAP=58)", WTAP_ENCAP_USER13 },
{ "USER14", "User 14 (DLT=161 WTAP_ENCAP=59)", WTAP_ENCAP_USER14 },
{ "USER15", "User 15 (DLT=162 WTAP_ENCAP=60)", WTAP_ENCAP_USER15 },
{ NULL, NULL, 0 }
};
static const enum_val_t encap_types[] = {
{ "None", "No encpsulation", 0 },
{ "SSCOP" , "SSCOP", 1 },
{ NULL, NULL, 0 }
};
static const encap_dissector_t encap_dissectors[] = {
NULL,
dissect_sscop_and_payload
};
static void dissect_user(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree,guint id);
static void dissect_user_a(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree) { dissect_user(tvb,pinfo,tree,0); }
static void dissect_user_b(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree) { dissect_user(tvb,pinfo,tree,1); }
static void dissect_user_c(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree) { dissect_user(tvb,pinfo,tree,2); }
static void dissect_user_d(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree) { dissect_user(tvb,pinfo,tree,3); }
user_encap_t encaps[] = {
{0,0,"DLT_USER_A","user_dlt_a","DLT User A","","","",0,0,-1,0,NULL,dissect_user_a,NULL,NULL,NULL,NULL,NULL},
{0,0,"DLT_USER_B","user_dlt_b","DLT User B","","","",0,0,-1,0,NULL,dissect_user_b,NULL,NULL,NULL,NULL,NULL},
{0,0,"DLT_USER_C","user_dlt_c","DLT User C","","","",0,0,-1,0,NULL,dissect_user_c,NULL,NULL,NULL,NULL,NULL},
{0,0,"DLT_USER_D","user_dlt_d","DLT User D","","","",0,0,-1,0,NULL,dissect_user_d,NULL,NULL,NULL,NULL,NULL},
};
static void dissect_user(tvbuff_t* tvb,packet_info* pinfo,proto_tree* tree,guint id) {
user_encap_t* encap = &(encaps[id]);
tvbuff_t* payload_tvb;
int offset = 0;
int len = tvb_reported_length(tvb) - (encap->header_size + encap->trailer_size);
if (encap->encap_dissector) {
encap->encap_dissector(tvb,pinfo,tree,encap->payload_handle);
return;
}
if (encap->header_size) {
tvbuff_t* hdr_tvb = tvb_new_subset(tvb, 0, encap->header_size, encap->header_size);
call_dissector(encap->header_handle, hdr_tvb, pinfo, tree);
offset = encap->header_size;
}
payload_tvb = tvb_new_subset(tvb, encap->header_size, len, len);
call_dissector(encap->payload_handle, 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_handle, trailer_tvb, pinfo, tree);
offset = encap->trailer_size;
}
}
void proto_reg_handoff_user_encap(void) {
guint i;
static dissector_handle_t data_handle;
data_handle = find_dissector("data");
for (i = 0; i < array_length(encaps); i++) {
if(encaps[i].last_encap)
dissector_delete("wtap_encap", encaps[i].last_encap, encaps[i].handle);
if (encaps[i].wtap_encap) {
encaps[i].handle = find_dissector(encaps[i].abbr);
dissector_add("wtap_encap", encaps[i].wtap_encap, encaps[i].handle);
encaps[i].last_encap = encaps[i].wtap_encap;
if(*(encaps[i].payload) != '\0') {
encaps[i].payload_handle = find_dissector(encaps[i].payload);
if (encaps[i].payload_handle == NULL) {
encaps[i].payload_handle = data_handle;
report_failure("%s: No such proto: %s",encaps[i].long_name,encaps[i].payload);
}
} else {
encaps[i].payload_handle = data_handle;
}
if(*(encaps[i].header) != '\0') {
encaps[i].header_handle = find_dissector(encaps[i].header);
if (encaps[i].header_handle == NULL) {
encaps[i].header_handle = data_handle;
report_failure("%s: No such proto: %s",encaps[i].long_name,encaps[i].header);
}
} else {
encaps[i].header_handle = data_handle;
}
if(*(encaps[i].trailer) != '\0') {
encaps[i].trailer_handle = find_dissector(encaps[i].trailer);
if (encaps[i].trailer_handle == NULL) {
encaps[i].trailer_handle = data_handle;
report_failure("%s: No such proto: %s",encaps[i].long_name,encaps[i].trailer);
}
} else {
encaps[i].trailer_handle = data_handle;
}
encaps[i].encap_dissector = encap_dissectors[encaps[i].special_encap];
}
}
}
void proto_register_user_encap(void)
{
size_t i;
for (i = 0; i < array_length(encaps); i++) {
encaps[i].hfid = proto_register_protocol(encaps[i].name, encaps[i].long_name, encaps[i].abbr);
encaps[i].module = prefs_register_protocol(encaps[i].hfid, proto_reg_handoff_user_encap);
prefs_register_enum_preference(encaps[i].module, "dlt","DLT", "Data Link Type", &(encaps[i].wtap_encap), user_dlts, FALSE);
prefs_register_enum_preference(encaps[i].module, "special_encap","Special Encapsulation", "", &(encaps[i].special_encap), encap_types, FALSE);
prefs_register_string_preference(encaps[i].module, "payload","Payload", "Payload", (const char **) &(encaps[i].payload));
prefs_register_uint_preference(encaps[i].module, "header_size","Header Size", "The size (in octets) of the Header", 10, &(encaps[i].header_size));
prefs_register_uint_preference(encaps[i].module, "trailer_size","Trailer Size", "The size (in octets) of the Trailer", 10, &(encaps[i].trailer_size));
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));
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));
register_dissector(encaps[i].abbr, encaps[i].dissector, encaps[i].hfid);
}
}
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