forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
319 lines
12 KiB
C
319 lines
12 KiB
C
/* packet-user_encap.c
|
|
* Allow users to specify the dissectors for DLTs
|
|
* Luis E. Garcia Ontanon <luis@ontanon.org>
|
|
*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
|
|
#include <epan/packet.h>
|
|
#include <epan/expert.h>
|
|
#include <epan/prefs.h>
|
|
#include <epan/uat.h>
|
|
#include <epan/exported_pdu.h>
|
|
#include <epan/tap.h>
|
|
#include <wiretap/wtap.h>
|
|
|
|
#ifdef _MSC_VER
|
|
/* disable: warning C4090: 'XY' : different 'const' qualifiers */
|
|
#pragma warning(disable:4090)
|
|
#endif
|
|
|
|
void proto_register_user_encap(void);
|
|
void proto_reg_handoff_user_encap(void);
|
|
|
|
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 expert_field ei_user_encap_not_handled = EI_INIT;
|
|
|
|
static user_encap_t* encaps = NULL;
|
|
static guint num_encaps = 0;
|
|
static uat_t* encaps_uat;
|
|
|
|
static gint exported_pdu_tap = -1;
|
|
|
|
/*
|
|
* Use this for DLT_USER2 if we don't have an encapsulation for it.
|
|
*/
|
|
static user_encap_t user2_encap;
|
|
|
|
static void export_pdu(tvbuff_t *tvb, packet_info* pinfo, char *proto_name)
|
|
{
|
|
if (have_tap_listener(exported_pdu_tap)) {
|
|
exp_pdu_data_t *exp_pdu_data;
|
|
guint8 exp_pdu_data_tag;
|
|
|
|
exp_pdu_data_tag = EXP_PDU_TAG_ORIG_FNO_BIT;
|
|
exp_pdu_data = load_export_pdu_tags(pinfo, EXP_PDU_TAG_PROTO_NAME, proto_name, &exp_pdu_data_tag, 1);
|
|
exp_pdu_data->tvb_captured_length = tvb_captured_length(tvb);
|
|
exp_pdu_data->tvb_reported_length = tvb_reported_length(tvb);
|
|
exp_pdu_data->pdu_tvb = tvb;
|
|
tap_queue_packet(exported_pdu_tap, pinfo, exp_pdu_data);
|
|
}
|
|
}
|
|
|
|
static int dissect_user(tvbuff_t* tvb, packet_info* pinfo, proto_tree* tree, void* data _U_) {
|
|
user_encap_t* encap = NULL;
|
|
tvbuff_t* payload_tvb;
|
|
proto_item* item;
|
|
gint len, reported_len;
|
|
guint i;
|
|
|
|
for (i = 0; i < num_encaps; i++) {
|
|
if (encaps[i].encap == pinfo->match_uint) {
|
|
encap = &(encaps[i]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
item = proto_tree_add_item(tree,proto_user_encap,tvb,0,-1,ENC_NA);
|
|
if (!encap && pinfo->match_uint == WTAP_ENCAP_USER2) {
|
|
/*
|
|
* Special-case DLT_USER2 - Apple hijacked it for use as DLT_PKTAP.
|
|
* The user hasn't assigned anything to it, so default it to
|
|
* the PKTAP dissector.
|
|
*/
|
|
encap = &user2_encap;
|
|
}
|
|
if (!encap) {
|
|
char* msg = wmem_strdup_printf(wmem_packet_scope(),
|
|
"User encapsulation not handled: DLT=%d, "
|
|
"check your Preferences->Protocols->DLT_USER",
|
|
pinfo->match_uint + 147 - WTAP_ENCAP_USER0);
|
|
proto_item_set_text(item,"%s",msg);
|
|
expert_add_info_format(pinfo, item, &ei_user_encap_not_handled, "%s", msg);
|
|
|
|
call_data_dissector(tvb, pinfo, tree);
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
if (encap->payload_proto == NULL) {
|
|
char* msg = wmem_strdup_printf(wmem_packet_scope(),
|
|
"User encapsulation's protocol %s not found: "
|
|
"DLT=%d, check your Preferences->Protocols->DLT_USER",
|
|
encap->payload_proto_name,
|
|
pinfo->match_uint + 147 - WTAP_ENCAP_USER0);
|
|
proto_item_set_text(item,"%s",msg);
|
|
expert_add_info_format(pinfo, item, &ei_user_encap_not_handled, "%s", msg);
|
|
|
|
call_data_dissector(tvb, pinfo, tree);
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
proto_item_set_text(item,"DLT: %d",pinfo->match_uint + 147 - WTAP_ENCAP_USER0);
|
|
|
|
if (encap->header_size) {
|
|
tvbuff_t* hdr_tvb = tvb_new_subset_length(tvb, 0, encap->header_size);
|
|
export_pdu(hdr_tvb, pinfo, encap->header_proto_name);
|
|
call_dissector(encap->header_proto, hdr_tvb, pinfo, tree);
|
|
if (encap->header_proto_name) {
|
|
const char *proto_name = dissector_handle_get_long_name(find_dissector(encap->header_proto_name));
|
|
if (proto_name) {
|
|
proto_item_append_text(item, ", Header: %s (%s)", encap->header_proto_name, proto_name);
|
|
}
|
|
}
|
|
}
|
|
|
|
len = tvb_captured_length(tvb) - (encap->header_size + encap->trailer_size);
|
|
reported_len = tvb_reported_length(tvb) - (encap->header_size + encap->trailer_size);
|
|
|
|
payload_tvb = tvb_new_subset(tvb, encap->header_size, len, reported_len);
|
|
export_pdu(payload_tvb, pinfo, encap->payload_proto_name);
|
|
call_dissector(encap->payload_proto, payload_tvb, pinfo, tree);
|
|
if (encap->payload_proto_name) {
|
|
const char *proto_name = dissector_handle_get_long_name(find_dissector(encap->payload_proto_name));
|
|
if (proto_name) {
|
|
proto_item_append_text(item, ", Payload: %s (%s)", encap->payload_proto_name, proto_name);
|
|
}
|
|
}
|
|
|
|
if (encap->trailer_size) {
|
|
tvbuff_t* trailer_tvb = tvb_new_subset_length(tvb, encap->header_size + len, encap->trailer_size);
|
|
export_pdu(trailer_tvb, pinfo, encap->trailer_proto_name);
|
|
call_dissector(encap->trailer_proto, trailer_tvb, pinfo, tree);
|
|
if (encap->trailer_proto_name) {
|
|
const char *proto_name = dissector_handle_get_long_name(find_dissector(encap->trailer_proto_name));
|
|
if (proto_name) {
|
|
proto_item_append_text(item, ", Trailer: %s (%s)", encap->trailer_proto_name, proto_name);
|
|
}
|
|
}
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
static void* user_copy_cb(void* dest, const void* orig, size_t len _U_)
|
|
{
|
|
const user_encap_t *o = (const user_encap_t *)orig;
|
|
user_encap_t *d = (user_encap_t *)dest;
|
|
|
|
d->payload_proto_name = g_strdup(o->payload_proto_name);
|
|
d->header_proto_name = g_strdup(o->header_proto_name);
|
|
d->trailer_proto_name = g_strdup(o->trailer_proto_name);
|
|
|
|
return d;
|
|
}
|
|
|
|
static void user_free_cb(void* record)
|
|
{
|
|
user_encap_t *u = (user_encap_t *)record;
|
|
|
|
g_free(u->payload_proto_name);
|
|
g_free(u->header_proto_name);
|
|
g_free(u->trailer_proto_name);
|
|
}
|
|
|
|
UAT_VS_DEF(user_encap, encap, user_encap_t, guint, 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)
|
|
|
|
void proto_reg_handoff_user_encap(void)
|
|
{
|
|
dissector_handle_t user_encap_handle;
|
|
guint i;
|
|
|
|
user_encap_handle = find_dissector("user_dlt");
|
|
|
|
user2_encap.encap = WTAP_ENCAP_USER2;
|
|
user2_encap.payload_proto_name = g_strdup("pktap");
|
|
user2_encap.payload_proto = find_dissector("pktap");
|
|
user2_encap.header_proto_name = g_strdup("");
|
|
user2_encap.header_proto = NULL;
|
|
user2_encap.trailer_proto_name = g_strdup("");
|
|
user2_encap.trailer_proto = NULL;
|
|
user2_encap.header_size = 0;
|
|
user2_encap.trailer_size = 0;
|
|
|
|
for (i = WTAP_ENCAP_USER0 ; i <= WTAP_ENCAP_USER15; i++)
|
|
dissector_add_uint("wtap_encap", i, user_encap_handle);
|
|
|
|
}
|
|
|
|
|
|
void proto_register_user_encap(void)
|
|
{
|
|
module_t *module;
|
|
expert_module_t* expert_user_encap;
|
|
|
|
static uat_field_t user_flds[] = {
|
|
UAT_FLD_VS(user_encap,encap,"DLT",user_dlts,"The DLT"),
|
|
UAT_FLD_PROTO(user_encap,payload_proto,"Payload protocol",
|
|
"Protocol to be used for the payload of this DLT"),
|
|
UAT_FLD_DEC(user_encap,header_size,"Header size",
|
|
"Size of an eventual header that precedes the actual payload, 0 means none"),
|
|
UAT_FLD_PROTO(user_encap,header_proto,"Header protocol",
|
|
"Protocol to be used for the header (empty = data)"),
|
|
UAT_FLD_DEC(user_encap,trailer_size,"Trailer size",
|
|
"Size of an eventual trailer that follows the actual payload, 0 means none"),
|
|
UAT_FLD_PROTO(user_encap,trailer_proto,"Trailer protocol",
|
|
"Protocol to be used for the trailer (empty = data)"),
|
|
UAT_END_FIELDS
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_user_encap_not_handled, { "user_dlt.not_handled", PI_UNDECODED, PI_WARN, "Formatted text", EXPFILL }},
|
|
};
|
|
|
|
proto_user_encap = proto_register_protocol("DLT User","DLT_USER","user_dlt");
|
|
expert_user_encap = expert_register_protocol(proto_user_encap);
|
|
expert_register_field_array(expert_user_encap, ei, array_length(ei));
|
|
|
|
module = prefs_register_protocol(proto_user_encap, NULL);
|
|
|
|
encaps_uat = uat_new("User DLTs Table",
|
|
sizeof(user_encap_t),
|
|
"user_dlts",
|
|
TRUE,
|
|
&encaps,
|
|
&num_encaps,
|
|
UAT_AFFECTS_DISSECTION, /* affects dissection of packets, but not set of named fields */
|
|
"ChUserDLTsSection",
|
|
user_copy_cb,
|
|
NULL,
|
|
user_free_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 certain 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"));
|
|
*/
|
|
|
|
exported_pdu_tap = register_export_pdu_tap("DLT User");
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|