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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 <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/expert.h>
#include <epan/prefs.h>
#include <epan/uat.h>
#include <epan/emem.h>
#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 encapsulation not handled: DLT=%d, check your Preferences->Protocols->DLT_USER",
pinfo->match_port + 147 - WTAP_ENCAP_USER0);
proto_item* item = proto_tree_add_text(tree, tvb, 0, 0, msg);
expert_add_info_format(pinfo, item, PI_UNDECODED, PI_WARN, msg);
call_dissector(data_handle, tvb, pinfo, tree);
return;
} else {
proto_item* item = proto_tree_add_item(tree,proto_user_encap,tvb,0,0,FALSE);
proto_item_set_text(item,"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",
TRUE,
(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"));
*/
}
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