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wireshark/epan/dissectors/packet-tpncp.c

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/* packet-tpncp.c
* Routines for Audiocodes TrunkPack Network Control Protocol (TPNCP) dissection
*
* Copyright (c) 2007 by Valery Sigalov <valery.sigalov@audiocodes.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.com>
* Copyright 1998 Gerald Combs
*
* 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/exceptions.h>
#include <epan/prefs.h>
#include <epan/to_str.h>
#include <wsutil/filesystem.h>
#include <wsutil/file_util.h>
#include <wsutil/report_message.h>
#include <wsutil/strtoi.h>
#include "packet-tcp.h"
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
#define BASE_TPNCP_PORT 2424
#define TCP_PORT_TPNCP_TRUNKPACK BASE_TPNCP_PORT
#define UDP_PORT_TPNCP_TRUNKPACK BASE_TPNCP_PORT
#define TCP_PORT_TPNCP_HOST BASE_TPNCP_PORT
#define UDP_PORT_TPNCP_HOST BASE_TPNCP_PORT
#define BASE_TPNCP_DATA_LEN 256
#define MAX_TPNCP_DB_ENTRY_LEN BASE_TPNCP_DATA_LEN
#define MAX_TPNCP_DB_SIZE 3000
#define MAX_ENUMS_NUM 500
#define MAX_ENUM_ENTRIES 500
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
void proto_register_tpncp(void);
void proto_reg_handoff_tpncp(void);
/* The linked list for storing information about specific data fields. */
typedef struct tpncp_data_field_info
{
gchar *tpncp_data_field_name;
gint tpncp_data_field_descr;
gint tpncp_data_field_sign;
gint tpncp_data_field_size;
gint tpncp_data_field_array_dim;
gint tpncp_data_field_is_ip_addr;
struct tpncp_data_field_info *p_next;
} tpncp_data_field_info;
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
/* Desegmentation of TPNCP over TCP */
static gboolean tpncp_desegment = TRUE;
/* Database for storing information about all TPNCP events. */
/* XXX: ToDo: allocate at runtime as needed */
static tpncp_data_field_info tpncp_events_info_db[MAX_TPNCP_DB_SIZE];
/* Database for storing information about all TPNCP commands. */
/* XXX: ToDo: allocate at runtime as needed */
static tpncp_data_field_info tpncp_commands_info_db[MAX_TPNCP_DB_SIZE];
/* Global variables for bitfields representation. */
static gint bits[] = {0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80};
static gint bitindex = 0;
/* TPNCP packet header fields. */
static gint proto_tpncp = -1;
static gint hf_tpncp_version = -1;
static gint hf_tpncp_length = -1;
static gint hf_tpncp_seq_number = -1;
/* static gint hf_tpncp_old_event_seq_number = -1; */
static gint hf_tpncp_reserved = -1;
static gint hf_tpncp_command_id = -1;
/* static gint hf_tpncp_old_command_id = -1; */
static gint hf_tpncp_event_id = -1;
static gint hf_tpncp_cid = -1;
/* TPNCP fields defining a subtree. */
static gint ett_tpncp = -1;
static gint ett_tpncp_body = -1;
static guint global_tpncp_trunkpack_tcp_port = TCP_PORT_TPNCP_TRUNKPACK;
static guint global_tpncp_trunkpack_udp_port = UDP_PORT_TPNCP_TRUNKPACK;
static guint global_tpncp_host_tcp_port = TCP_PORT_TPNCP_HOST;
static guint global_tpncp_host_udp_port = UDP_PORT_TPNCP_HOST;
static gboolean global_tpncp_load_db = FALSE;
static dissector_handle_t tpncp_handle;
static guint trunkpack_tcp_port = 0;
static guint trunkpack_udp_port = 0;
static guint host_tcp_port = 0;
static guint host_udp_port = 0;
/* XXX: ToDo: allocate at runtime as needed */
/* The following allocates something on the order of 2M of static memory ! */
/* Also: Runtime value_string_ext arrays should be used */
static value_string tpncp_commands_id_vals[MAX_TPNCP_DB_SIZE];
static value_string tpncp_events_id_vals[MAX_TPNCP_DB_SIZE];
static value_string tpncp_enums_id_vals[MAX_ENUMS_NUM][MAX_ENUM_ENTRIES];
static gchar *tpncp_enums_name_vals[MAX_ENUMS_NUM];
static gint hf_size = 1;
static gint hf_allocated = 0;
static hf_register_info *hf = NULL;
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static void dissect_tpncp_data(gint data_id, tvbuff_t *tvb, proto_tree *ltree,
gint *offset, tpncp_data_field_info *data_fields_info) {
proto_item *pi = NULL;
gint32 g_int;
gint16 g_short;
guint16 g_ushort;
gint8 g_char;
guint8 g_uchar;
gint g_str_len, counter, bitshift, bitmask;
tpncp_data_field_info *current_tpncp_data_field_info = NULL;
current_tpncp_data_field_info = &data_fields_info[data_id];
while (current_tpncp_data_field_info) {
switch(current_tpncp_data_field_info->tpncp_data_field_size) {
case 1: case 2: case 3: case 4:
case 5: case 6: case 7: case 8:
if ((g_str_len = current_tpncp_data_field_info->tpncp_data_field_array_dim)) { /* add char array */
g_str_len = MIN(g_str_len, tvb_reported_length_remaining(tvb, *offset));
proto_tree_add_item(ltree, current_tpncp_data_field_info->tpncp_data_field_descr,
tvb, *offset, g_str_len, ENC_NA|ENC_ASCII);
(*offset) += g_str_len;
}
else { /* add single char */
g_uchar = tvb_get_guint8(tvb, *offset);
/* bitfields */
if (current_tpncp_data_field_info->tpncp_data_field_size != 8) {
for (counter = 0, bitmask = 0x0, bitshift = bitindex;
counter < current_tpncp_data_field_info->tpncp_data_field_size;
counter++)
bitmask |= bits[bitindex++]; /* Bitmask of interesting bits. */
g_uchar &= bitmask;
g_uchar >>= bitshift;
}
if (current_tpncp_data_field_info->tpncp_data_field_sign || current_tpncp_data_field_info->tpncp_data_field_size != 8) {
proto_tree_add_uint(ltree, current_tpncp_data_field_info->tpncp_data_field_descr,
tvb, *offset, 1, g_uchar);
}
else {
/* signed*/
g_char = (gint8)g_uchar;
proto_tree_add_int(ltree, current_tpncp_data_field_info->tpncp_data_field_descr,
tvb, *offset, 1, g_char);
}
if ((bitindex == 0) || (bitindex == 8)) {
(*offset)++;
bitindex = 0;
}
}
break;
case 16:
if (current_tpncp_data_field_info->tpncp_data_field_sign) {
g_ushort = tvb_get_ntohs(tvb, *offset);
proto_tree_add_uint(ltree, current_tpncp_data_field_info->tpncp_data_field_descr,
tvb, *offset, 2, g_ushort);
}
else {
g_short = tvb_get_ntohs(tvb, *offset);
proto_tree_add_int(ltree, current_tpncp_data_field_info->tpncp_data_field_descr,
tvb, *offset, 2, g_short);
}
(*offset) += 2;
break;
case 32:
g_int = tvb_get_ntohl(tvb, *offset);
if (current_tpncp_data_field_info->tpncp_data_field_sign) {
pi = proto_tree_add_uint(ltree, current_tpncp_data_field_info->tpncp_data_field_descr,
tvb, *offset, 4, g_int);
}
else {
pi = proto_tree_add_int(ltree, current_tpncp_data_field_info->tpncp_data_field_descr,
tvb, *offset, 4, g_int);
}
/* Add string representation for ip_address's field (if needed). */
if (current_tpncp_data_field_info->tpncp_data_field_is_ip_addr) {
proto_item_append_text(pi, " (%s)", tvb_ip_to_str(tvb, *offset));
}
(*offset) += 4;
break;
default:
break;
}
current_tpncp_data_field_info = current_tpncp_data_field_info->p_next;
if (tvb_reported_length_remaining(tvb, *offset) <= 0) {
break;
}
}
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static void dissect_tpncp_event(gint event_id, tvbuff_t *tvb,
proto_tree *tree, gint *offset) {
switch (event_id) {
/* Place non-standard events here. */
default:
dissect_tpncp_data(event_id, tvb, tree, offset, tpncp_events_info_db);
break;
}
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static void dissect_tpncp_command(gint command_id, tvbuff_t *tvb,
proto_tree *tree, gint *offset) {
switch (command_id) {
/* Place non-standard commands here. */
default:
dissect_tpncp_data(command_id, tvb, tree, offset, tpncp_commands_info_db);
break;
}
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static int dissect_tpncp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) {
proto_item *item = NULL;
proto_tree *tpncp_tree = NULL, *event_tree, *command_tree;
gint offset = 0;
guint32 id, cid = 0;
guint16 seq_number, len, ver, reserved;
ver = tvb_get_ntohs(tvb, 0);
len = tvb_get_ntohs(tvb, 2);
seq_number = tvb_get_ntohs(tvb, 4);
reserved = tvb_get_ntohs(tvb, 6);
id = tvb_get_ntohl(tvb, 8);
if (pinfo->srcport == UDP_PORT_TPNCP_TRUNKPACK) /* Event */
cid = tvb_get_ntohl(tvb, 12 );
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TPNCP");
if (pinfo->srcport == UDP_PORT_TPNCP_TRUNKPACK) {
col_add_fstr(pinfo->cinfo, COL_INFO,
"EvID=%s(%d), SeqNo=%d, ChID=%d, Len=%d, Ver=%d",
val_to_str_const(id, tpncp_events_id_vals, "Unknown"),
id, seq_number, cid, len, ver);
} else {
col_add_fstr(pinfo->cinfo, COL_INFO,
"CmdID=%s(%d), SeqNo=%d, Len=%d, Ver=%d",
val_to_str_const(id, tpncp_commands_id_vals, "Unknown"),
id, seq_number, len, ver);
}
if (tree) {
item = proto_tree_add_item(tree, proto_tpncp, tvb, 0, -1, ENC_NA);
tpncp_tree = proto_item_add_subtree(item, ett_tpncp);
proto_tree_add_uint(tpncp_tree, hf_tpncp_version, tvb, 0, 2, ver);
proto_tree_add_uint(tpncp_tree, hf_tpncp_length, tvb, 2, 2, len);
proto_tree_add_uint(tpncp_tree, hf_tpncp_seq_number, tvb, 4, 2, seq_number);
proto_tree_add_uint(tpncp_tree, hf_tpncp_reserved, tvb, 6, 2, reserved);
if (pinfo->srcport == UDP_PORT_TPNCP_TRUNKPACK) {
if (try_val_to_str(id, tpncp_events_id_vals)) {
proto_tree_add_uint(tpncp_tree, hf_tpncp_event_id, tvb, 8, 4, id);
proto_tree_add_int(tpncp_tree, hf_tpncp_cid, tvb, 12, 4, cid);
offset += 16;
if (tpncp_events_info_db[id].tpncp_data_field_size) {
event_tree = proto_tree_add_subtree_format(tree, tvb, offset, -1, ett_tpncp_body, NULL, "TPNCP Event: %s (%d)",
val_to_str_const(id, tpncp_events_id_vals, "Unknown"), id);
dissect_tpncp_event(id, tvb, event_tree, &offset);
}
}
}
else {
if (try_val_to_str(id, tpncp_commands_id_vals)) {
proto_tree_add_uint(tpncp_tree, hf_tpncp_command_id, tvb, 8, 4, id);
offset += 12;
if (tpncp_commands_info_db[id].tpncp_data_field_size) {
command_tree = proto_tree_add_subtree_format(tree, tvb, offset, -1, ett_tpncp_body, NULL, "TPNCP Command: %s (%d)",
val_to_str_const(id, tpncp_commands_id_vals, "Unknown"), id);
dissect_tpncp_command(id, tvb, command_tree, &offset);
}
}
}
}
return tvb_reported_length(tvb);
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static guint get_tpncp_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb,
int offset, void *data _U_)
{
guint16 plen;
/* Get the length of the DNS packet. */
plen = tvb_get_ntohs(tvb, offset + 2);
/* Length does not include the version+length field. */
plen += 4;
return plen;
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static int dissect_tpncp_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data) {
if (pinfo->can_desegment)
/* If desegmentation is enabled (TCP preferences) use the desegmentation API. */
tcp_dissect_pdus(tvb, pinfo, tree, tpncp_desegment, 4, get_tpncp_pdu_len, dissect_tpncp, data);
else
/* Otherwise use the regular dissector (might not give correct dissection). */
dissect_tpncp(tvb, pinfo, tree, data);
return tvb_reported_length(tvb);
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static gint fill_tpncp_id_vals(value_string string[], FILE *file) {
gint i = 0, tpncp_id = 0;
gchar *tpncp_name, *line_in_file;
line_in_file = (gchar *)g_malloc(MAX_TPNCP_DB_ENTRY_LEN);
line_in_file[0] = 0;
tpncp_name = (gchar *)g_malloc(MAX_TPNCP_DB_ENTRY_LEN);
tpncp_name[0] = 0;
while (fgets(line_in_file, MAX_TPNCP_DB_ENTRY_LEN, file) != NULL) {
if (!strncmp(line_in_file, "#####", 5)) {
break;
}
if (sscanf(line_in_file, "%255s %d", tpncp_name, &tpncp_id) == 2) {
string[i].strptr = g_strdup(tpncp_name);
string[i].value = tpncp_id;
if (i < (MAX_TPNCP_DB_SIZE-1)) {
i++;
}
else {
break;
}
}
}
g_free(line_in_file);
g_free(tpncp_name);
return 0;
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static gint fill_enums_id_vals(FILE *file) {
gint i = 0, enum_id = 0, enum_val = 0;
gboolean first_entry = TRUE;
gchar *line_in_file = NULL, *enum_name = NULL,
*enum_type = NULL, *enum_str = NULL;
line_in_file = (gchar *)g_malloc(MAX_TPNCP_DB_ENTRY_LEN);
line_in_file[0] = 0;
enum_name = (gchar *)g_malloc(MAX_TPNCP_DB_ENTRY_LEN);
enum_name[0] = 0;
enum_type = (gchar *)g_malloc(MAX_TPNCP_DB_ENTRY_LEN);
enum_type[0] = 0;
enum_str = (gchar *)g_malloc(MAX_TPNCP_DB_ENTRY_LEN);
enum_str[0] = 0;
while (fgets(line_in_file, MAX_TPNCP_DB_ENTRY_LEN, file) != NULL) {
if (!strncmp(line_in_file, "#####", 5)) {
break;
}
if (sscanf(line_in_file, "%255s %255s %d", enum_name, enum_str, &enum_id) == 3) {
if (strcmp(enum_type, enum_name)) {
if (!first_entry) {
tpncp_enums_id_vals[enum_val][i].strptr = NULL;
tpncp_enums_id_vals[enum_val][i].value = 0;
if (enum_val < (MAX_ENUMS_NUM-1)) {
enum_val++; i = 0;
}
else {
break;
}
}
else
first_entry = FALSE;
tpncp_enums_name_vals[enum_val] = g_strdup(enum_name);
g_strlcpy(enum_type, enum_name, MAX_TPNCP_DB_ENTRY_LEN);
}
tpncp_enums_id_vals[enum_val][i].strptr = g_strdup(enum_str);
tpncp_enums_id_vals[enum_val][i].value = enum_id;
if (i < (MAX_ENUM_ENTRIES-1)) {
i++;
}
else {
break;
}
}
}
/* make sure the last entry in the array is null but
* don't overflow if we've filled the entire thing (in which case
* we have to drop an entry) */
if (enum_val + 1 >= MAX_ENUMS_NUM) {
g_free(tpncp_enums_name_vals[enum_val]);
tpncp_enums_name_vals[enum_val] = NULL;
}
else {
tpncp_enums_name_vals[enum_val+1] = NULL;
}
g_free(line_in_file);
g_free(enum_name);
g_free(enum_type);
g_free(enum_str);
return 0;
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static gint get_enum_name_val(gchar *enum_name) {
gint enum_val = 0;
while (tpncp_enums_name_vals[enum_val]) {
if (!strcmp(enum_name, tpncp_enums_name_vals[enum_val]))
return enum_val;
enum_val++;
}
return -1;
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static gint init_tpncp_data_fields_info(tpncp_data_field_info *data_fields_info, FILE *file) {
static gboolean was_registered = FALSE;
gchar *tpncp_db_entry = NULL, *tpncp_data_field_name = NULL, *tmp = NULL;
gint enum_val, data_id, current_data_id = -1,
tpncp_data_field_sign, tpncp_data_field_size,
tpncp_data_field_array_dim, tpncp_data_field_is_ip_addr;
guint idx;
tpncp_data_field_info *current_tpncp_data_field_info = NULL;
hf_register_info hf_entr;
static hf_register_info hf_tpncp[] = {
{
&hf_tpncp_version,
{
"Version",
"tpncp.version",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
NULL, HFILL
}
},
{
&hf_tpncp_length,
{
"Length",
"tpncp.length",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
NULL, HFILL
}
},
{
&hf_tpncp_seq_number,
{
"Sequence number",
"tpncp.seq_number",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
NULL, HFILL
}
},
#if 0
{
&hf_tpncp_old_event_seq_number,
{
"Sequence number",
"tpncp.old_event_seq_number",
FT_UINT32,
BASE_DEC,
NULL,
0x0,
NULL, HFILL
}
},
#endif
{
&hf_tpncp_reserved,
{
"Reserved",
"tpncp.reserved",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
NULL, HFILL
}
},
{
&hf_tpncp_command_id,
{
"Command ID",
"tpncp.command_id",
FT_UINT32,
BASE_DEC,
VALS(tpncp_commands_id_vals),
0x0,
NULL, HFILL
}
},
#if 0
{
&hf_tpncp_old_command_id,
{
"Command ID",
"tpncp.old_command_id",
FT_UINT16,
BASE_DEC,
VALS(tpncp_commands_id_vals),
0x0,
NULL, HFILL
}
},
#endif
{
&hf_tpncp_event_id,
{
"Event ID",
"tpncp.event_id",
FT_UINT32,
BASE_DEC,
VALS(tpncp_events_id_vals),
0x0,
NULL, HFILL
}
},
{
&hf_tpncp_cid,
{
"Channel ID",
"tpncp.channel_id",
FT_INT32,
BASE_DEC,
NULL,
0x0,
NULL, HFILL
}
}
};
/* Register common fields of hf_register_info structure. */
hf_entr.hfinfo.type = FT_NONE;
hf_entr.hfinfo.strings = NULL;
hf_entr.hfinfo.bitmask = 0x0;
hf_entr.hfinfo.blurb = NULL;
HFILL_INIT(hf_entr);
if (!was_registered) {
/* Register non-standard data should be done only once. */
hf_allocated = hf_size+(int)array_length(hf_tpncp)-1;
if ((hf = (hf_register_info *)g_realloc(hf, hf_allocated * sizeof(hf_register_info))) == NULL) {
/* XXX realloc returning NULL does not free the original memory,
* is this a leak? */
return (-1);
}
for (idx = 0; idx < array_length(hf_tpncp); idx++) {
memcpy(hf + (hf_size - 1), hf_tpncp + idx, sizeof(hf_register_info));
hf_size++;
}
was_registered = TRUE;
}
else
hf_size++;
/* Register standard data. */
tpncp_db_entry = (gchar *)g_malloc(MAX_TPNCP_DB_ENTRY_LEN);
tpncp_db_entry[0] = 0;
while (fgets(tpncp_db_entry, MAX_TPNCP_DB_ENTRY_LEN, file) != NULL) {
if (!strncmp(tpncp_db_entry, "#####", 5)) {
hf_size--;
break;
}
/* Default to decimal display type */
hf_entr.hfinfo.display = BASE_DEC;
if ((tmp = strtok(tpncp_db_entry, " ")) == NULL)
continue; /* Badly formed data base entry - skip corresponding field's registration. */
if (!ws_strtou32(tmp, NULL, &data_id))
continue;
if ((tpncp_data_field_name = strtok(NULL, " ")) == NULL)
continue; /* Badly formed data base entry - skip corresponding field's registration. */
if ((tmp = strtok(NULL, " ")) == NULL)
continue; /* Badly formed data base entry - skip corresponding field's registration. */
if (!ws_strtou32(tmp, NULL, &tpncp_data_field_sign))
continue;
if ((tmp = strtok(NULL, " ")) == NULL)
continue; /* Badly formed data base entry - skip corresponding field's registration. */
if (!ws_strtou32(tmp, NULL, &tpncp_data_field_size))
continue;
if ((tmp = strtok(NULL, " ")) == NULL)
continue; /* Badly formed data base entry - skip corresponding field's registration. */
if (!ws_strtou32(tmp, NULL, &tpncp_data_field_array_dim))
continue;
if ((tmp = strtok(NULL, " ")) == NULL)
continue; /* Badly formed data base entry - skip corresponding field's registration. */
if (!ws_strtou32(tmp, NULL, &tpncp_data_field_is_ip_addr))
continue;
if ((tmp = strtok(NULL, "\n")) == NULL)
continue; /* Badly formed data base entry - skip corresponding field's registration. */
if (current_data_id != data_id) { /* new data */
current_tpncp_data_field_info = &data_fields_info[data_id];
current_data_id = data_id;
}
else {
if ((current_tpncp_data_field_info->p_next =
(tpncp_data_field_info *)g_malloc0(sizeof(tpncp_data_field_info)))
== NULL) {
g_free(tpncp_db_entry);
return (-1);
}
current_tpncp_data_field_info = current_tpncp_data_field_info->p_next;
}
/* Register specific fields of hf_register_info struture. */
if (strcmp(tmp, "primitive")) {
enum_val = get_enum_name_val(tmp);
if (enum_val == -1) {
hf_entr.hfinfo.strings = NULL;
}
else {
hf_entr.hfinfo.strings = VALS(tpncp_enums_id_vals[enum_val]);
}
}
else {
hf_entr.hfinfo.strings = NULL;
}
current_tpncp_data_field_info->tpncp_data_field_descr = -1;
hf_entr.p_id = &current_tpncp_data_field_info->tpncp_data_field_descr;
current_tpncp_data_field_info->tpncp_data_field_name = g_strdup_printf("tpncp.%s", tpncp_data_field_name);
hf_entr.hfinfo.name = current_tpncp_data_field_info->tpncp_data_field_name;
hf_entr.hfinfo.abbrev = current_tpncp_data_field_info->tpncp_data_field_name;
switch (tpncp_data_field_size) {
case 1: case 2: case 3: case 4:
case 5: case 6: case 7: case 8:
if (tpncp_data_field_array_dim) {
hf_entr.hfinfo.type = FT_STRING;
hf_entr.hfinfo.display = BASE_NONE;
}
else
hf_entr.hfinfo.type = (tpncp_data_field_sign)?FT_UINT8:FT_INT8;
break;
case 16:
hf_entr.hfinfo.type = (tpncp_data_field_sign)?FT_UINT16:FT_INT16;
break;
case 32:
hf_entr.hfinfo.type = (tpncp_data_field_sign)?FT_UINT32:FT_INT32;
break;
default:
break;
}
/* Register initialized hf_register_info in global database. */
if (hf_size > hf_allocated) {
hf_allocated += 1024;
if ((hf = (hf_register_info *)g_realloc(hf, hf_allocated * sizeof(hf_register_info))) == NULL) {
/* XXX realloc returning NULL does not free the original memory,
* is this a leak? */
g_free(tpncp_db_entry);
return (-1);
}
}
memcpy(hf + hf_size - 1, &hf_entr, sizeof(hf_register_info));
hf_size++;
current_tpncp_data_field_info->tpncp_data_field_sign = tpncp_data_field_sign;
current_tpncp_data_field_info->tpncp_data_field_size = tpncp_data_field_size;
current_tpncp_data_field_info->tpncp_data_field_array_dim = tpncp_data_field_array_dim;
current_tpncp_data_field_info->tpncp_data_field_is_ip_addr = tpncp_data_field_is_ip_addr;
}
g_free(tpncp_db_entry);
return 0;
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
static gint init_tpncp_db(void) {
gchar *tpncp_dat_file_path;
gint ret;
FILE *file;
tpncp_dat_file_path = g_strdup_printf("%s" G_DIR_SEPARATOR_S"tpncp" G_DIR_SEPARATOR_S "tpncp.dat", get_datafile_dir());
/* Open file with TPNCP data. */
if ((file = ws_fopen(tpncp_dat_file_path, "r")) == NULL) {
g_free(tpncp_dat_file_path);
return (-1);
}
g_free(tpncp_dat_file_path);
ret = fill_tpncp_id_vals(tpncp_events_id_vals, file);
if (ret != 0)
goto done;
ret = fill_tpncp_id_vals(tpncp_commands_id_vals, file);
if (ret != 0)
goto done;
ret = fill_enums_id_vals(file);
if (ret != 0)
goto done;
ret = init_tpncp_data_fields_info(tpncp_events_info_db, file);
if (ret != 0)
goto done;
ret = init_tpncp_data_fields_info(tpncp_commands_info_db, file);
done:
fclose(file);
return ret;
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
void proto_reg_handoff_tpncp(void) {
static gint tpncp_prefs_initialized = FALSE;
static dissector_handle_t tpncp_tcp_handle;
gint idx;
/* If we weren't able to load the database (and thus the hf_ entries)
* do not attach to any ports (if we did then we'd get a "dissector bug"
* assertions every time a packet is handed to us and we tried to use the
* hf_ entry).
*/
if (proto_tpncp == -1)
return;
if (!tpncp_prefs_initialized) {
tpncp_tcp_handle = create_dissector_handle(dissect_tpncp_tcp, proto_tpncp);
tpncp_prefs_initialized = TRUE;
}
else {
dissector_delete_uint("tcp.port", trunkpack_tcp_port, tpncp_tcp_handle);
dissector_delete_uint("udp.port", trunkpack_udp_port, tpncp_handle);
dissector_delete_uint("tcp.port", host_tcp_port, tpncp_tcp_handle);
dissector_delete_uint("udp.port", host_udp_port, tpncp_handle);
}
if(global_tpncp_load_db){
if (hf_allocated == 0) {
if (init_tpncp_db() == -1) {
report_failure("tpncp: Could not load tpncp.dat file, tpncp dissector will not work");
return;
}
/* Rather than duplicating large quantities of code from
* proto_register_field_array() and friends to sanitize the tpncp.dat file
* when we read it, just catch any exceptions we get while registering and
* take them as a hint that the file is corrupt. Then move on, so that at
* least the rest of the protocol dissectors will still work.
*/
TRY {
/* The function proto_register_field_array does not work with dynamic
* arrays, so pass dynamic array elements one-by-one in the loop.
*/
for(idx = 0; idx < hf_size; idx++) {
proto_register_field_array(proto_tpncp, &hf[idx], 1);
}
}
CATCH_ALL {
report_failure("Corrupt tpncp.dat file, tpncp dissector will not work.");
}
ENDTRY;
}
trunkpack_tcp_port = global_tpncp_trunkpack_tcp_port;
trunkpack_udp_port = global_tpncp_trunkpack_udp_port;
host_tcp_port = global_tpncp_host_tcp_port;
host_udp_port = global_tpncp_host_udp_port;
dissector_add_uint("tcp.port", global_tpncp_trunkpack_tcp_port, tpncp_tcp_handle);
dissector_add_uint("udp.port", global_tpncp_trunkpack_udp_port, tpncp_handle);
}
}
/*-------------------------------------------------------------------------------------------------------------------------------------------*/
void proto_register_tpncp(void) {
module_t *tpncp_module;
static gint *ett[] = {
&ett_tpncp,
&ett_tpncp_body
};
/* this dissector reads hf entries from a database
a boolean preference defines whether the database is loaded or not
we initialize the hf array in the handoff function when we have
access to the preference's value */
proto_tpncp = proto_register_protocol("AudioCodes TPNCP (TrunkPack Network Control Protocol)",
"TPNCP", "tpncp");
tpncp_handle = register_dissector("tpncp", dissect_tpncp, proto_tpncp);
tpncp_module = prefs_register_protocol(proto_tpncp, proto_reg_handoff_tpncp);
proto_register_subtree_array(ett, array_length(ett));
/* See https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=9569 for some discussion on this as well */
prefs_register_bool_preference(tpncp_module, "load_db",
"Whether to load DB or not; if DB not loaded dissector is passive",
"Whether to load the Database or not; not loading the DB"
" disables the protocol; Wireshark has to be restarted for the"
" setting to take effect.",
&global_tpncp_load_db);
prefs_register_uint_preference(tpncp_module, "tcp.trunkpack_port",
"TPNCP \"well-known\" TrunkPack TCP Port",
"", 10, &global_tpncp_trunkpack_tcp_port);
prefs_register_uint_preference(tpncp_module, "udp.trunkpack_port",
"TPNCP \"well-known\" TrunkPack UDP Port",
"", 10, &global_tpncp_trunkpack_udp_port);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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