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wireshark/epan/dissectors/packet-ua.c
Michael Mann 1e60d63c8c Create call_data_dissector() to call data dissector. 
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>
2016-03-20 17:38:03 +00:00

324 lines
9.1 KiB
C
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/* packet-ua.c
* Routines for UA/UDP (Universal Alcatel over UDP) packet dissection.
* Copyright 2012, Alcatel-Lucent Enterprise <lars.ruoff@alcatel-lucent.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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/prefs.h>
#include "packet-rtp.h"
#include "packet-rtcp.h"
#include "packet-uaudp.h"
void proto_register_ua_msg(void);
void proto_reg_handoff_ua_msg(void);
/*-----------------------------------------------------------------------------
GLOBALS
---------------------------------------------------------------------------*/
#if 0
static dissector_table_t ua_opcode_dissector_table;
#endif
static int proto_ua_msg = -1;
static gint ett_ua_msg = -1;
static gboolean setup_conversations_enabled = TRUE;
static dissector_handle_t noe_handle;
static dissector_handle_t ua3g_handle;
static void uadecode(e_ua_direction direction,
proto_tree *tree,
packet_info *pinfo,
tvbuff_t *tvb,
gint offset,
gint opcode,
gint length)
{
switch (opcode & 0x7f) /* suppression of the CP bit */
{
case 0x15:
case 0x16:
{
call_dissector(noe_handle,
tvb_new_subset_length(tvb, offset, length),
pinfo,
tree);
break;
}
case 0x00:
case 0x01:
case 0x02:
case 0x03:
case 0x04:
case 0x05:
case 0x06:
case 0x07: /* Only UA NOE */
case 0x08: /* Only UA NOE */
case 0x09:
case 0x0A:
case 0x0B:
case 0x0C:
case 0x0D:
case 0x0E:
case 0x0F:
case 0x11:
case 0x12:
case 0x13:
case 0x14:
case 0x17:
case 0x18:
case 0x1F: /* case 0x9F */
case 0x20:
case 0x21:
case 0x22:
case 0x23:
case 0x24: /* Only IP NOE */
case 0x25: /* Only IP NOE */
case 0x26:
case 0x27:
case 0x28:
case 0x29:
case 0x2A:
case 0x2B: /* Only UA NOE */
case 0x2C:
case 0x2D:
case 0x2E:
case 0x30:
case 0x31:
case 0x32: /* Only UA NOE */
case 0x33:
case 0x35:
case 0x36: /* IP Phone */
case 0x38:
case 0x39:
case 0x3A:
case 0x3B:
case 0x3C:
case 0x3D:
case 0x3E:
case 0x3F:
case 0x40:
case 0x41:
case 0x42:
case 0x43:
case 0x44:
case 0x45:
case 0x46:
case 0x47:
case 0x48:
case 0x49:
case 0x4A:
case 0x4B:
case 0x4C:
case 0x4D:
case 0x4E:
case 0x4F:
case 0x50: /* Only UA NOE */
{
call_dissector_with_data(ua3g_handle,
tvb_new_subset_length(tvb, offset, length),
pinfo,
tree, &direction);
break;
}
default:
{
/* add text to the frame "INFO" column */
col_append_fstr(pinfo->cinfo, COL_INFO, " - UA3G Message ERR: Opcode (0x%02x) Unknown", tvb_get_guint8(tvb, (offset + 2)));
call_data_dissector(tvb_new_subset_length(tvb, offset, length),
pinfo,
tree);
break;
}
}
}
/*-----------------------------------------------------------------------------
UA DISSECTOR
---------------------------------------------------------------------------*/
static void _dissect_ua_msg(tvbuff_t *tvb,
packet_info *pinfo,
proto_tree *tree,
e_ua_direction direction)
{
gint offset = 0;
proto_item *ua_msg_item;
proto_tree *ua_msg_tree;
ua_msg_item = proto_tree_add_protocol_format(tree, proto_ua_msg, tvb, 0, -1,
"Universal Alcatel Protocol, %s",
((direction == SYS_TO_TERM) ?
"System -> Terminal" : "Terminal -> System"));
ua_msg_tree = proto_item_add_subtree(ua_msg_item, ett_ua_msg);
while (tvb_offset_exists(tvb, offset))
{
gint length;
gint opcode;
length = tvb_get_letohs(tvb, offset) + 2;
opcode = tvb_get_guint8(tvb, offset+2);
/* RTP/RTCP conversation setup */
if (setup_conversations_enabled && (opcode==0x13) && (tvb_get_guint8(tvb, offset+3)==0x01))
{
address remote_rtp_addr;
guint32 remote_rtp_port;
gint suboffset;
remote_rtp_addr.data = NULL;
remote_rtp_port = 0;
/* StartRTP */
suboffset = offset + 5;
while (suboffset < offset+length)
{
switch (tvb_get_guint8(tvb, suboffset))
{
case 0x00: /* local port */
{
/*local_rtp_port = tvb_get_ntohs(tvb, suboffset+2);*/
break;
}
case 0x01: /* remote IP */
{
set_address_tvb(&remote_rtp_addr, AT_IPv4, 4, tvb, suboffset+2);
break;
}
case 0x02: /* remote port */
{
remote_rtp_port = tvb_get_ntohs(tvb, suboffset+2);
break;
}
}
suboffset += tvb_get_guint8(tvb, suboffset+1) + 2;
}
if ((remote_rtp_addr.data != NULL) && (remote_rtp_port != 0))
{
rtp_add_address(pinfo, &remote_rtp_addr, remote_rtp_port, 0,
"UA", pinfo->num, 0, NULL);
rtcp_add_address(pinfo, &remote_rtp_addr, remote_rtp_port+1, 0,
"UA", pinfo->num);
}
}
uadecode(direction, ua_msg_tree, pinfo, tvb, offset, opcode, length);
offset += length;
}
}
static int dissect_ua_sys_to_term(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
_dissect_ua_msg(tvb, pinfo, tree, SYS_TO_TERM);
return tvb_captured_length(tvb);
}
static int dissect_ua_term_to_sys(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
_dissect_ua_msg(tvb, pinfo, tree, TERM_TO_SYS);
return tvb_captured_length(tvb);
}
/*-----------------------------------------------------------------------------
DISSECTORS REGISTRATION FUNCTIONS
---------------------------------------------------------------------------*/
void proto_register_ua_msg(void)
{
module_t *ua_msg_module;
static gint *ett[] =
{
&ett_ua_msg,
};
/* UA dissector registration */
proto_ua_msg = proto_register_protocol("Universal Alcatel Protocol", "UA", "ua");
register_dissector("ua_sys_to_term", dissect_ua_sys_to_term, proto_ua_msg);
register_dissector("ua_term_to_sys", dissect_ua_term_to_sys, proto_ua_msg);
/* Common subtree array registration */
proto_register_subtree_array(ett, array_length(ett));
/* Register preferences */
ua_msg_module = prefs_register_protocol(proto_ua_msg, NULL);
prefs_register_bool_preference(ua_msg_module, "setup_conversations",
"Setup RTP/RTCP conversations on Start RTP",
"Setup RTP/RTCP conversations when parsing Start RTP messages",
&setup_conversations_enabled);
}
void proto_reg_handoff_ua_msg(void)
{
#if 0 /* Future */
dissector_handle_t handle_ua_msg;
/* hooking of UA on UAUDP */
/* XXX: The following is NG since the same 'pattern' is added twice */
handle_ua_msg = find_dissector("ua_sys_to_term");
dissector_add_uint("uaudp.opcode", UAUDP_DATA, handle_ua_msg);
handle_ua_msg = find_dissector("ua_term_to_sys");
dissector_add_uint("uaudp.opcode", UAUDP_DATA, handle_ua_msg);
/* For hooking dissectors to UA */
ua_opcode_dissector_table =
register_dissector_table("ua.opcode",
"ua.opcode",
FT_UINT8,
BASE_HEX, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
#endif
noe_handle = find_dissector_add_dependency("noe", proto_ua_msg);
ua3g_handle = find_dissector_add_dependency("ua3g", proto_ua_msg);
}
/*
* 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:
*/
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