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wireshark/packet-gsm_sms_ud.c

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/* packet-gsm_sms_ud.c
* Routines for GSM SMS TP-UD (GSM 03.40) dissection
*
* $Id: packet-gsm_sms_ud.c,v 1.5 2004/01/29 21:19:10 obiot Exp $
*
* Refer to the AUTHORS file or the AUTHORS section in the man page
* for contacting the author(s) of this file.
*
* Separated from the SMPP dissector by Chris Wilson.
*
* UDH and WSP dissection of SMS message, Short Message reassembly,
* "Decode Short Message with Port Number UDH as CL-WSP" preference,
* "Always try subdissection of 1st fragment" preference,
* provided by Olivier Biot.
*
* Note on SMS Message reassembly
* ------------------------------
* The current Short Message reassembly is possible thanks to the
* message identifier (8 or 16 bit identifier). It is able to reassemble
* short messages that are sent over either the same SMPP connection or
* distinct SMPP connections. Normally the reassembly code is able to deal
* with duplicate message identifiers since the fragment_add_seq_check()
* call is used.
*
* The SMS TP-UD preference "always try subdissection of 1st fragment" allows
* a subdissector to be called for the first Short Message fragment,
* even if reassembly is not possible. This way partial dissection
* is still possible. This preference is switched off by default.
*
* Note on Short Message decoding as CL-WSP
* ----------------------------------------
* The SMS TP-UD preference "port_number_udh_means_wsp" is switched off
* by default. If it is enabled, then any Short Message with a Port Number
* UDH will be decoded as CL-WSP if:
* - The Short Message is not segmented
* - The entire segmented Short Message is reassembled
* - It is the 1st segment of an unreassembled Short Message (if the
* "always try subdissection of 1st fragment" preference is enabled)
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <glib.h>
#include <epan/packet.h>
#include "prefs.h"
#include "reassemble.h"
static void dissect_gsm_sms_ud(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static int proto_gsm_sms_ud = -1;
/*
* Short Message fragment handling
*/
static int hf_gsm_sms_ud_fragments = -1;
static int hf_gsm_sms_ud_fragment = -1;
static int hf_gsm_sms_ud_fragment_overlap = -1;
static int hf_gsm_sms_ud_fragment_overlap_conflicts = -1;
static int hf_gsm_sms_ud_fragment_multiple_tails = -1;
static int hf_gsm_sms_ud_fragment_too_long_fragment = -1;
static int hf_gsm_sms_ud_fragment_error = -1;
static int hf_gsm_sms_ud_reassembled_in = -1;
/*
* User Data Header section
*/
static int hf_gsm_sms_udh_length = -1;
static int hf_gsm_sms_udh_iei = -1;
static int hf_gsm_sms_udh_multiple_messages = -1;
static int hf_gsm_sms_udh_multiple_messages_msg_id = -1;
static int hf_gsm_sms_udh_multiple_messages_msg_parts = -1;
static int hf_gsm_sms_udh_multiple_messages_msg_part = -1;
static int hf_gsm_sms_udh_ports = -1;
static int hf_gsm_sms_udh_ports_src = -1;
static int hf_gsm_sms_udh_ports_dst = -1;
static gint ett_gsm_sms = -1;
static gint ett_udh = -1;
static gint ett_udh_ie = -1;
static gint ett_gsm_sms_ud_fragment = -1;
static gint ett_gsm_sms_ud_fragments = -1;
/* Subdissector declarations */
static dissector_table_t gsm_sms_dissector_table;
/* Short Message reassembly */
static GHashTable *sm_fragment_table = NULL;
static GHashTable *sm_reassembled_table = NULL;
static const fragment_items sm_frag_items = {
/* Fragment subtrees */
&ett_gsm_sms_ud_fragment,
&ett_gsm_sms_ud_fragments,
/* Fragment fields */
&hf_gsm_sms_ud_fragments,
&hf_gsm_sms_ud_fragment,
&hf_gsm_sms_ud_fragment_overlap,
&hf_gsm_sms_ud_fragment_overlap_conflicts,
&hf_gsm_sms_ud_fragment_multiple_tails,
&hf_gsm_sms_ud_fragment_too_long_fragment,
&hf_gsm_sms_ud_fragment_error,
/* Reassembled in field */
&hf_gsm_sms_ud_reassembled_in,
/* Tag */
"Short Message fragments"
};
/* Dissect all SM data as WSP if the UDH contains a Port Number IE */
static gboolean port_number_udh_means_wsp = FALSE;
/* Always try dissecting the 1st fragment of a SM,
* even if it is not reassembled */
static gboolean try_dissect_1st_frag = FALSE;
/* Prevent subdissectors changing column data */
static gboolean prevent_subdissectors_changing_columns = FALSE;
static dissector_handle_t wsp_handle;
static void
gsm_sms_ud_defragment_init (void)
{
fragment_table_init (&sm_fragment_table);
reassembled_table_init(&sm_reassembled_table);
}
/*
* Value-arrays for field-contents
*/
/* 3GPP TS 23.040 V6.1.0 (2003-06) */
static const value_string vals_udh_iei[] = {
{ 0x00, "SMS - Concatenated short messages, 8-bit reference number" },
{ 0x01, "SMS - Special SMS Message Indication" },
{ 0x02, "Reserved" },
{ 0x03, "Value not used to avoid misinterpretation as <LF> character" },
{ 0x04, "SMS - Application port addressing scheme, 8 bit address" },
{ 0x05, "SMS - Application port addressing scheme, 16 bit address" },
{ 0x06, "SMS - SMSC Control Parameters" },
{ 0x07, "SMS - UDH Source Indicator" },
{ 0x08, "SMS - Concatenated short message, 16-bit reference number" },
{ 0x09, "SMS - Wireless Control Message Protocol" },
{ 0x0A, "EMS - Text Formatting" },
{ 0x0B, "EMS - Predefined Sound" },
{ 0x0C, "EMS - User Defined Sound (iMelody max 128 bytes)" },
{ 0x0D, "EMS - Predefined Animation" },
{ 0x0E, "EMS - Large Animation (16*16 times 4 = 32*4 =128 bytes)" },
{ 0x0F, "EMS - Small Animation (8*8 times 4 = 8*4 =32 bytes)" },
{ 0x10, "EMS - Large Picture (32*32 = 128 bytes)" },
{ 0x11, "EMS - Small Picture (16*16 = 32 bytes)" },
{ 0x12, "EMS - Variable Picture" },
{ 0x13, "EMS - User prompt indicator" },
{ 0x14, "EMS - Extended Object" },
{ 0x15, "EMS - Reused Extended Object" },
{ 0x16, "EMS - Compression Control" },
{ 0x17, "EMS - Object Distribution Indicator" },
{ 0x18, "EMS - Standard WVG object" },
{ 0x19, "EMS - Character Size WVG object" },
{ 0x1A, "EMS - Extended Object Data Request Command" },
{ 0x20, "SMS - RFC 822 E-Mail Header" },
{ 0x21, "SMS - Hyperlink format element" },
{ 0x22, "SMS - Reply Address Element" },
{ 0x00, NULL }
};
/* Parse Short Message, only if UDH present
* (otherwise this function is not called).
* Call WSP dissector if port matches WSP traffic.
*/
static void
parse_gsm_sms_ud_message(proto_tree *sm_tree, tvbuff_t *tvb, packet_info *pinfo,
proto_tree *top_tree)
{
tvbuff_t *sm_tvb = NULL;
proto_item *subtree, *tree;
guint8 udh_len, udh, len;
guint sm_len = tvb_reported_length (tvb);
guint sm_data_len;
guint32 i = 0;
/* Multiple Messages UDH */
gboolean is_fragmented = FALSE;
fragment_data *fd_sm = NULL;
guint16 sm_id = 0, frags = 0, frag = 0;
gboolean save_fragmented = FALSE, try_gsm_sms_ud_reassemble = FALSE;
/* SMS Message reassembly */
gboolean reassembled = FALSE;
guint32 reassembled_in = 0;
/* Port Number UDH */
guint16 p_src = 0, p_dst = 0;
gboolean ports_available = FALSE;
udh_len = tvb_get_guint8(tvb, i++);
tree = proto_tree_add_uint(sm_tree, hf_gsm_sms_udh_length, tvb, 0, 1, udh_len);
tree = proto_item_add_subtree(tree, ett_udh);
while (i < udh_len) {
udh = tvb_get_guint8(tvb, i++);
len = tvb_get_guint8(tvb, i++);
subtree = proto_tree_add_uint(tree, hf_gsm_sms_udh_iei,
tvb, i-2, 2+len, udh);
switch (udh) {
case 0x00: /* Multiple messages - 8-bit message ID */
if (len == 3) {
sm_id = tvb_get_guint8(tvb, i++);
frags = tvb_get_guint8(tvb, i++);
frag = tvb_get_guint8(tvb, i++);
if (frags > 1)
is_fragmented = TRUE;
proto_item_append_text(subtree,
": message %u, part %u of %u", sm_id, frag, frags);
subtree = proto_item_add_subtree(subtree,
ett_udh_ie);
proto_tree_add_uint (subtree,
hf_gsm_sms_udh_multiple_messages_msg_id,
tvb, i-3, 1, sm_id);
proto_tree_add_uint (subtree,
hf_gsm_sms_udh_multiple_messages_msg_parts,
tvb, i-2, 1, frags);
proto_tree_add_uint (subtree,
hf_gsm_sms_udh_multiple_messages_msg_part,
tvb, i-1, 1, frag);
} else {
proto_item_append_text(subtree, " - Invalid format!");
i += len;
}
break;
case 0x08: /* Multiple messages - 16-bit message ID */
if (len == 4) {
sm_id = tvb_get_ntohs(tvb, i); i += 2;
frags = tvb_get_guint8(tvb, i++);
frag = tvb_get_guint8(tvb, i++);
if (frags > 1)
is_fragmented = TRUE;
proto_item_append_text(subtree,
": message %u, part %u of %u", sm_id, frag, frags);
subtree = proto_item_add_subtree(subtree,
ett_udh_ie);
proto_tree_add_uint (subtree,
hf_gsm_sms_udh_multiple_messages_msg_id,
tvb, i-4, 2, sm_id);
proto_tree_add_uint (subtree,
hf_gsm_sms_udh_multiple_messages_msg_parts,
tvb, i-2, 1, frags);
proto_tree_add_uint (subtree,
hf_gsm_sms_udh_multiple_messages_msg_part,
tvb, i-1, 1, frag);
} else {
proto_item_append_text(subtree, " - Invalid format!");
i += len;
}
break;
case 0x04: /* Port Number UDH - 8-bit address */
if (len == 2) { /* Port fields */
p_dst = tvb_get_guint8(tvb, i++);
p_src = tvb_get_guint8(tvb, i++);
proto_item_append_text(subtree,
": source port %u, destination port %u",
p_src, p_dst);
subtree = proto_item_add_subtree(subtree, ett_udh_ie);
proto_tree_add_uint (subtree, hf_gsm_sms_udh_ports_dst,
tvb, i-2, 1, p_dst);
proto_tree_add_uint (subtree, hf_gsm_sms_udh_ports_src,
tvb, i-1, 1, p_src);
ports_available = TRUE;
} else {
proto_item_append_text(subtree, " - Invalid format!");
i += len;
}
break;
case 0x05: /* Port Number UDH - 16-bit address */
if (len == 4) { /* Port fields */
p_dst = tvb_get_ntohs(tvb, i); i += 2;
p_src = tvb_get_ntohs(tvb, i); i += 2;
proto_item_append_text(subtree,
": source port %u, destination port %u",
p_src, p_dst);
subtree = proto_item_add_subtree(subtree, ett_udh_ie);
proto_tree_add_uint (subtree, hf_gsm_sms_udh_ports_dst,
tvb, i-4, 2, p_dst);
proto_tree_add_uint (subtree, hf_gsm_sms_udh_ports_src,
tvb, i-2, 2, p_src);
ports_available = TRUE;
} else {
proto_item_append_text(subtree, " - Invalid format!");
i += len;
}
break;
default:
i += len;
break;
}
}
if (tvb_reported_length_remaining(tvb, i) <= 0)
return; /* No more data */
/*
* XXX - where does the "1" come from? If it weren't there,
* "sm_data_len" would, I think, be the same as
* "tvb_reported_length_remaining(tvb, i)".
*
* I think that the above check ensures that "sm_len" won't
* be less than or equal to "udh_len", so it ensures that
* "sm_len" won't be less than "1 + udh_len", so we don't
* have to worry about "sm_data_len" being negative.
*/
sm_data_len = sm_len - (1 + udh_len);
if (sm_data_len == 0)
return; /* no more data */
/*
* Try reassembling the packets.
* XXX - fragment numbers are 1-origin, but the fragment number
* field could be 0.
* Should we flag a fragmented message with a fragment number field
* of 0?
* What if the fragment count is 0? Should we flag that as well?
*/
if ( is_fragmented && frag != 0 && frags != 0 &&
tvb_bytes_exist (tvb, i, sm_data_len) ) {
try_gsm_sms_ud_reassemble = TRUE;
save_fragmented = pinfo->fragmented;
pinfo->fragmented = TRUE;
fd_sm = fragment_add_seq_check (tvb, i, pinfo,
sm_id, /* guint32 ID for fragments belonging together */
sm_fragment_table, /* list of message fragments */
sm_reassembled_table, /* list of reassembled messages */
frag-1, /* guint32 fragment sequence number */
sm_data_len, /* guint32 fragment length */
(frag != frags)); /* More fragments? */
if (fd_sm) {
reassembled = TRUE;
reassembled_in = fd_sm->reassembled_in;
}
sm_tvb = process_reassembled_data(tvb, i, pinfo,
"Reassembled Short Message", fd_sm, &sm_frag_items,
NULL, sm_tree);
if (reassembled) { /* Reassembled */
if (check_col (pinfo->cinfo, COL_INFO))
col_append_str (pinfo->cinfo, COL_INFO,
" (Short Message Reassembled)");
} else {
/* Not last packet of reassembled Short Message */
if (check_col (pinfo->cinfo, COL_INFO))
col_append_fstr (pinfo->cinfo, COL_INFO,
" (Short Message fragment %u of %u)", frag, frags);
}
} /* Else: not fragmented */
if (! sm_tvb) /* One single Short Message, or not reassembled */
sm_tvb = tvb_new_subset (tvb, i, -1, -1);
/* Try calling a subdissector */
if (sm_tvb) {
if ((reassembled && pinfo->fd->num == reassembled_in)
|| frag==0 || (frag==1 && try_dissect_1st_frag)) {
/* Try calling a subdissector only if:
* - the Short Message is reassembled in this very packet,
* - the Short Message consists of only one "fragment",
* - the preference "Always Try Dissection for 1st SM fragment"
* is switched on, and this is the SM's 1st fragment. */
if ( ports_available ) {
gboolean disallow_write = FALSE; /* TRUE if we changed writability
of the columns of the summary */
if ( prevent_subdissectors_changing_columns && col_get_writable(pinfo->cinfo) ) {
disallow_write = TRUE;
col_set_writable(pinfo->cinfo, FALSE);
}
if ( port_number_udh_means_wsp ) {
call_dissector (wsp_handle, sm_tvb, pinfo, top_tree);
} else {
if (! dissector_try_port(gsm_sms_dissector_table, p_src,
sm_tvb, pinfo, top_tree)) {
if (! dissector_try_port(gsm_sms_dissector_table, p_dst,
sm_tvb, pinfo, top_tree)) {
if (sm_tree) { /* Only display if needed */
proto_tree_add_text (sm_tree, sm_tvb, 0, -1,
"Short Message body");
}
}
}
}
if ( disallow_write )
col_set_writable(pinfo->cinfo, TRUE);
} else { /* No ports IE */
proto_tree_add_text (sm_tree, sm_tvb, 0, -1,
"Short Message body");
}
} else {
/* The packet is not reassembled,
* or it is reassembled in another packet */
proto_tree_add_text (sm_tree, sm_tvb, 0, -1,
"Unreassembled Short Message fragment %u of %u",
frag, frags);
}
}
if (try_gsm_sms_ud_reassemble) /* Clean up defragmentation */
pinfo->fragmented = save_fragmented;
return;
}
static void
dissect_gsm_sms_ud(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *subtree;
ti = proto_tree_add_item(tree, proto_gsm_sms_ud, tvb, 0, -1, TRUE);
subtree = proto_item_add_subtree(ti, ett_gsm_sms);
parse_gsm_sms_ud_message(subtree, tvb, pinfo, tree);
}
/* Register the protocol with Ethereal */
void
proto_register_gsm_sms_ud(void)
{
module_t *gsm_sms_ud_module; /* Preferences for GSM SMS UD */
/* Setup list of header fields */
static hf_register_info hf[] = {
/*
* User Data Header
*/
{ &hf_gsm_sms_udh_iei,
{ "IE Id", "gsm-sms-ud.udh.iei",
FT_UINT8, BASE_HEX, VALS(vals_udh_iei), 0x00,
"Name of the User Data Header Information Element.",
HFILL
}
},
{ &hf_gsm_sms_udh_length,
{ "UDH Length", "gsm-sms-ud.udh.len",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Length of the User Data Header (bytes)",
HFILL
}
},
{ &hf_gsm_sms_udh_multiple_messages,
{ "Multiple messages UDH", "gsm-sms-ud.udh.mm",
FT_NONE, BASE_NONE, NULL, 0x00,
"Multiple messages User Data Header",
HFILL
}
},
{ &hf_gsm_sms_udh_multiple_messages_msg_id,
{ "Message identifier", "gsm-sms-ud.udh.mm.msg_id",
FT_UINT16, BASE_DEC, NULL, 0x00,
"Identification of the message",
HFILL
}
},
{ &hf_gsm_sms_udh_multiple_messages_msg_parts,
{ "Message parts", "gsm-sms-ud.udh.mm.msg_parts",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Total number of message parts (fragments)",
HFILL
}
},
{ &hf_gsm_sms_udh_multiple_messages_msg_part,
{ "Message part number", "gsm-sms-ud.udh.mm.msg_part",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Message part (fragment) sequence number",
HFILL
}
},
{ &hf_gsm_sms_udh_ports,
{ "Port number UDH", "gsm-sms-ud.udh.ports",
FT_NONE, BASE_NONE, NULL, 0x00,
"Port number User Data Header",
HFILL
}
},
{ &hf_gsm_sms_udh_ports_src,
{ "Source port", "gsm-sms-ud.udh.ports.src",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Source port",
HFILL
}
},
{ &hf_gsm_sms_udh_ports_dst,
{ "Destination port", "gsm-sms-ud.udh.ports.dst",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Destination port",
HFILL
}
},
/*
* Short Message fragment reassembly
*/
{ &hf_gsm_sms_ud_fragments,
{ "Short Message fragments", "gsm-sms-ud.fragments",
FT_NONE, BASE_NONE, NULL, 0x00,
"GSM Short Message fragments",
HFILL
}
},
{ &hf_gsm_sms_ud_fragment,
{ "Short Message fragment", "gsm-sms-ud.fragment",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
"GSM Short Message fragment",
HFILL
}
},
{ &hf_gsm_sms_ud_fragment_overlap,
{ "Short Message fragment overlap", "gsm-sms-ud.fragment.overlap",
FT_BOOLEAN, BASE_NONE, NULL, 0x00,
"GSM Short Message fragment overlaps with other fragment(s)",
HFILL
}
},
{ &hf_gsm_sms_ud_fragment_overlap_conflicts,
{ "Short Message fragment overlapping with conflicting data",
"gsm-sms-ud.fragment.overlap.conflicts",
FT_BOOLEAN, BASE_NONE, NULL, 0x00,
"GSM Short Message fragment overlaps with conflicting data",
HFILL
}
},
{ &hf_gsm_sms_ud_fragment_multiple_tails,
{ "Short Message has multiple tail fragments",
"gsm-sms-ud.fragment.multiple_tails",
FT_BOOLEAN, BASE_NONE, NULL, 0x00,
"GSM Short Message fragment has multiple tail fragments",
HFILL
}
},
{ &hf_gsm_sms_ud_fragment_too_long_fragment,
{ "Short Message fragment too long",
"gsm-sms-ud.fragment.too_long_fragment",
FT_BOOLEAN, BASE_NONE, NULL, 0x00,
"GSM Short Message fragment data goes beyond the packet end",
HFILL
}
},
{ &hf_gsm_sms_ud_fragment_error,
{ "Short Message defragmentation error", "gsm-sms-ud.fragment.error",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
"GSM Short Message defragmentation error due to illegal fragments",
HFILL
}
},
{ &hf_gsm_sms_ud_reassembled_in,
{ "Reassembled in",
"gsm-sms-ud.reassembled.in",
FT_FRAMENUM, BASE_NONE, NULL, 0x00,
"GSM Short Message has been reassembled in this packet.", HFILL
}
},
};
static gint *ett[] = {
&ett_gsm_sms,
&ett_udh,
&ett_udh_ie,
&ett_gsm_sms_ud_fragment,
&ett_gsm_sms_ud_fragments,
};
/* Register the protocol name and description */
proto_gsm_sms_ud = proto_register_protocol(
"GSM Short Message Service User Data", /* Name */
"GSM SMS UD", /* Short name */
"gsm-sms-ud"); /* Filter name */
/* Required function calls to register header fields and subtrees used */
proto_register_field_array(proto_gsm_sms_ud, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Subdissector code */
gsm_sms_dissector_table = register_dissector_table("gsm-sms-ud.udh.port",
"GSM SMS port IE in UDH", FT_UINT16, BASE_DEC);
/* Preferences for GSM SMS UD */
gsm_sms_ud_module = prefs_register_protocol (proto_gsm_sms_ud, NULL);
prefs_register_bool_preference (gsm_sms_ud_module,
"port_number_udh_means_wsp",
"Port Number IE in UDH always triggers CL-WSP dissection",
"Always decode a GSM Short Message as Connectionless WSP "
"if a Port Number Information Element is present "
"in the SMS User Data Header.",
&port_number_udh_means_wsp);
prefs_register_bool_preference (gsm_sms_ud_module, "try_dissect_1st_fragment",
"Always try subdissection of 1st Short Message fragment",
"Always try subdissection of the 1st fragment of a fragmented "
"GSM Short Message. If reassembly is possible, the Short Message "
"may be dissected twice (once as a short frame, once in its "
"entirety).",
&try_dissect_1st_frag);
prefs_register_bool_preference (gsm_sms_ud_module, "prevent_dissectors_chg_cols",
"Prevent sub-dissectors from changing column data",
"Prevent sub-dissectors from replacing column data with their "
"own. Eg. Prevent WSP dissector overwriting SMPP information.",
&prevent_subdissectors_changing_columns);
register_dissector("gsm-sms-ud", dissect_gsm_sms_ud, proto_gsm_sms_ud);
/* GSM SMS UD dissector initialization routines */
register_init_routine (gsm_sms_ud_defragment_init);
}
void
proto_reg_handoff_gsm_sms_ud(void)
{
dissector_handle_t gsm_sms_ud_handle;
gsm_sms_ud_handle = create_dissector_handle(dissect_gsm_sms_ud,
proto_gsm_sms_ud);
wsp_handle = find_dissector("wsp-cl");
g_assert(wsp_handle);
}
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