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wireshark/packet-ansi_637.c

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/* packet-ansi_637.c
* Routines for ANSI IS-637-A (SMS) dissection
*
* Copyright 2003, Michael Lum <mlum [AT] telostech.com>
* In association with Telos Technology Inc.
*
* Title 3GPP2 Other
*
* Short Message Service
* 3GPP2 C.S0015-0 TIA/EIA-637-A
*
* $Id: packet-ansi_637.c,v 1.1 2003/10/06 19:25:20 guy Exp $
*
* 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 <gmodule.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <string.h>
#include "epan/packet.h"
static char *ansi_proto_name = "ANSI IS-637-A (SMS)";
static char *ansi_proto_name_short = "IS-637-A";
static const value_string ansi_msg_type_strings[] = {
{ 1, "Deliver (mobile-terminated only)" },
{ 2, "Submit (mobile-originated only)" },
{ 3, "Cancellation (mobile-originated only)" },
{ 4, "Delivery Acknowledgement (mobile-terminated only)" },
{ 5, "User Acknowledgement (either direction)" },
{ 0, NULL },
};
static const value_string ansi_tele_strings[] = {
{ 1, "Reserved for maintenance" },
{ 4096, "AMPS Extended Protocol Enhanced Services" },
{ 4097, "CDMA Cellular Paging Teleservice" },
{ 4098, "CDMA Cellular Messaging Teleservice" },
{ 4099, "CDMA Voice Mail Notification" },
{ 32513, "TDMA Cellular Messaging Teleservice" },
{ 32520, "TDMA System Assisted Mobile Positioning through Satellite (SAMPS)" },
{ 32584, "TDMA Segmented System Assisted Mobile Positioning Service" },
{ 0, NULL },
};
static const value_string ansi_param_strings[] = {
{ 0x00, "Message Identifier" },
{ 0x01, "User Data" },
{ 0x02, "User Response Code" },
{ 0x03, "Message Center Time Stamp" },
{ 0x04, "Validity Period - Absolute" },
{ 0x05, "Validity Period - Relative" },
{ 0x06, "Deferred Delivery Time - Absolute" },
{ 0x07, "Deferred Delivery Time - Relative" },
{ 0x08, "Priority Indicator" },
{ 0x09, "Privacy Indicator" },
{ 0x0a, "Reply Option" },
{ 0x0b, "Number of Messages" },
{ 0x0c, "Alert on Message Delivery" },
{ 0x0d, "Language Indicator" },
{ 0x0e, "Call-Back Number" },
{ 0x0f, "Message Display Mode" },
{ 0x10, "Multiple Encoding User Data" },
{ 0, NULL },
};
/* Initialize the protocol and registered fields */
static int proto_ansi_637 = -1;
static int hf_ansi_637_none = -1;
static int hf_ansi_637_msg_type = -1;
static int hf_ansi_637_msg_id = -1;
static int hf_ansi_637_msg_junk = -1;
static int hf_ansi_637_length = -1;
static int hf_ansi_637_subparam_id = -1;
/* Initialize the subtree pointers */
static gint ett_ansi_637 = -1;
static gint ett_params = -1;
static char bigbuf[1024];
static dissector_handle_t data_handle;
/* FUNCTIONS */
static void
decode_7_bits(tvbuff_t *tvb, guint32 *offset, guint8 num_fields, guint8 *last_oct, guint8 *last_bit, gchar *buf)
{
guint8 oct, oct2, bit;
guint32 saved_offset;
guint32 i;
if (num_fields == 0)
{
return;
}
saved_offset = *offset;
oct = oct2 = *last_oct;
bit = *last_bit;
if (bit == 1)
{
oct2 = tvb_get_guint8(tvb, *offset);
(*offset)++;
}
for (i=0; i < num_fields; i++)
{
if (bit != 1)
{
oct = oct2;
/*
* cannot grab an octet if we are getting
* the last field and bit is 7 or 8
* because there may not be another octet
*/
if (((i + 1) != num_fields) ||
((bit != 7) && (bit != 8)))
{
oct2 = tvb_get_guint8(tvb, *offset);
(*offset)++;
}
}
switch (bit)
{
case 1:
buf[i] = ((oct & 0x01) << 6) | ((oct2 & 0xfc) >> 2);
break;
case 2:
buf[i] = ((oct & 0x03) << 5) | ((oct2 & 0xf8) >> 3);
break;
case 3:
buf[i] = ((oct & 0x07) << 4) | ((oct2 & 0xf0) >> 4);
break;
case 4:
buf[i] = ((oct & 0x0f) << 3) | ((oct2 & 0xe0) >> 5);
break;
case 5:
buf[i] = ((oct & 0x1f) << 2) | ((oct2 & 0xc0) >> 6);
break;
case 6:
buf[i] = ((oct & 0x3f) << 1) | ((oct2 & 0x80) >> 7);
break;
case 7:
buf[i] = oct & 0x7f;
break;
case 8:
buf[i] = (oct & 0xfe) >> 1;
break;
}
bit = (bit % 8) + 1;
}
buf[i] = '\0';
*last_bit = bit;
*last_oct = (bit == 1) ? oct : oct2;
}
/* Generate, into "buf", a string showing the bits of a bitfield.
* Return a pointer to the character after that string.
*/
static char *
my_decode_bitfield_value(char *buf, guint32 val, guint32 mask, int width)
{
int i;
guint32 bit;
char *p;
i = 0;
p = buf;
bit = 1 << (width - 1);
for (;;)
{
if (mask & bit)
{
/* This bit is part of the field. Show its value. */
if (val & bit)
{
*p++ = '1';
}
else
{
*p++ = '0';
}
}
else
{
/* This bit is not part of the field. */
*p++ = '.';
}
bit >>= 1;
i++;
if (i >= width) break;
if (i % 4 == 0) *p++ = ' ';
}
*p = '\0';
return(p);
}
static gchar *
my_match_strval(guint32 val, const value_string *vs, gint *idx)
{
gint i = 0;
while (vs[i].strptr)
{
if (vs[i].value == val)
{
*idx = i;
return(vs[i].strptr);
}
i++;
}
*idx = -1;
return(NULL);
}
/* PARAM FUNCTIONS */
#define EXTRANEOUS_DATA_CHECK(edc_len, edc_max_len) \
if ((edc_len) > (edc_max_len)) \
{ \
proto_tree_add_none_format(tree, hf_ansi_637_none, tvb, \
offset, (edc_len) - (edc_max_len), "Extraneous Data"); \
}
#define SHORT_DATA_CHECK(sdc_len, sdc_min_len) \
if ((sdc_len) < (sdc_min_len)) \
{ \
proto_tree_add_none_format(tree, hf_ansi_637_none, tvb, \
offset, (sdc_len), "Short Data (?)"); \
return; \
}
#define EXACT_DATA_CHECK(edc_len, edc_eq_len) \
if ((edc_len) != (edc_eq_len)) \
{ \
proto_tree_add_none_format(tree, hf_ansi_637_none, tvb, \
offset, (edc_len), "Unexpected Data Length"); \
return; \
}
static void
param_user_data(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct, oct2;
guint8 encoding;
guint8 msg_type;
guint8 num_fields;
guint8 used;
guint8 bit;
guint32 required_octs;
guint32 saved_offset;
guint32 i;
gchar *str = NULL;
SHORT_DATA_CHECK(len, 2);
/*
* message encoding
*/
oct = tvb_get_guint8(tvb, offset);
oct2 = 0;
msg_type = 0;
used = 0;
encoding = ((oct & 0xf8) >> 3);
switch (encoding)
{
case 0x00: str = "Octet, unspecified"; break;
case 0x01: str = "Extended Protocol Message";
oct2 = tvb_get_guint8(tvb, offset+1);
msg_type = ((oct & 0x07) << 5) | ((oct2 & 0xf8) >> 3);
break;
case 0x02: str = "7-bit ASCII"; break;
case 0x03: str = "IA5"; break;
case 0x04: str = "UNICODE"; break;
case 0x05: str = "Shift-JIS"; break;
case 0x06: str = "Korean"; break;
case 0x07: str = "Latin/Hebrew"; break;
case 0x08: str = "Latin"; break;
case 0x09: str = "GSM 7-bit default alphabet"; break;
default: str = "Reserved"; break;
}
my_decode_bitfield_value(bigbuf, oct, 0xf8, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Encoding, %s",
bigbuf,
str);
if (encoding == 0x01)
{
my_decode_bitfield_value(bigbuf, oct, 0x07, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Message type, see TIA/EIA/IS-91 (%d)",
bigbuf,
msg_type);
my_decode_bitfield_value(bigbuf, oct2, 0xf8, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset+1, 1,
"%s : Message type",
bigbuf);
oct = oct2;
offset++;
used++;
}
offset++;
used++;
/*
* number of fields
*/
oct2 = tvb_get_guint8(tvb, offset);
num_fields = ((oct & 0x07) << 5) | ((oct2 & 0xf8) >> 3);
my_decode_bitfield_value(bigbuf, oct, 0x07, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset-1, 1,
"%s : Number of fields (%d)",
bigbuf,
num_fields);
my_decode_bitfield_value(bigbuf, oct2, 0xf8, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Number of fields",
bigbuf);
my_decode_bitfield_value(bigbuf, oct2, 0x07, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Most significant bits of first field",
bigbuf);
offset++;
used++;
oct = oct2;
/* NOTE: there are now 3 bits remaining in 'oct' */
if (len - used <= 0) return;
/*
* decode rest if 7-bit ASCII
*/
if (encoding == 0x02)
{
/*
* magic numbers:
* 3 bits remaining from last octet
* 7 bit encoding
* 8 bits per octet
*/
i = (num_fields * 7) - 3;
required_octs = (i / 8) + ((i % 8) ? 1 : 0);
if (required_octs + used > len)
{
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"Missing %d octet(s) for number of fields",
(required_octs + used) - len);
return;
}
bit = 3;
saved_offset = offset;
decode_7_bits(tvb, &offset, num_fields, &oct, &bit, bigbuf);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, saved_offset, offset - saved_offset,
"Encoded user data, %s",
bigbuf);
switch (bit)
{
case 1: oct2 = 0x01; break;
case 2: oct2 = 0x03; break;
case 3: oct2 = 0x07; break;
case 4: oct2 = 0x0f; break;
case 5: oct2 = 0x1f; break;
case 6: oct2 = 0x3f; break;
case 7: oct2 = 0x7f; break;
}
if (bit != 8)
{
my_decode_bitfield_value(bigbuf, oct, oct2, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset - 1, 1,
"%s : Reserved",
bigbuf);
}
}
else
{
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, len - used,
"Encoded user data");
}
}
static void
param_rsp_code(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
EXACT_DATA_CHECK(len, 1);
/*
* response code
*/
oct = tvb_get_guint8(tvb, offset);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"Response code (%d)",
oct);
}
static void
param_timestamp(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct, oct2, oct3;
EXACT_DATA_CHECK(len, 6);
oct = tvb_get_guint8(tvb, offset);
oct2 = tvb_get_guint8(tvb, offset+1);
oct3 = tvb_get_guint8(tvb, offset+2);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 3,
"Year %d%d, Month %d%d, Day %d%d",
(oct & 0xf0) >> 4,
oct & 0x0f,
(oct2 & 0xf0) >> 4,
oct2 & 0x0f,
(oct3 & 0xf0) >> 4,
oct3 & 0x0f);
offset += 3;
oct = tvb_get_guint8(tvb, offset);
oct2 = tvb_get_guint8(tvb, offset+1);
oct3 = tvb_get_guint8(tvb, offset+2);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 3,
"Hour %d%d, Minutes %d%d, Seconds %d%d",
(oct & 0xf0) >> 4,
oct & 0x0f,
(oct2 & 0xf0) >> 4,
oct2 & 0x0f,
(oct3 & 0xf0) >> 4,
oct3 & 0x0f);
}
static void
param_rel_timestamp(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
guint32 value = 0;
gchar *str = NULL;
gchar *str2 = NULL;
EXACT_DATA_CHECK(len, 1);
oct = tvb_get_guint8(tvb, offset);
switch (oct)
{
case 245: str = "Indefinite"; break;
case 246: str = "Immediate"; break;
case 247: str = "Valid until mobile becomes inactive/Deliver when mobile next becomes active"; break;
case 248: str = "Valid until registration area changes, discard if not registered" ; break;
default:
if (oct <= 143) { value = (oct + 1) * 5; str2 = "Minutes"; break; }
else if ((oct >= 144) && (oct <= 167)) { value = (oct - 143) * 30; str2 = "Minutes + 12 Hours"; break; }
else if ((oct >= 168) && (oct <= 196)) { value = oct - 166; str2 = "Days"; break; }
else if ((oct >= 197) && (oct <= 244)) { value = oct - 192; str2 = "Weeks"; break; }
else { str = "Reserved"; break; }
}
if (str == NULL)
{
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s",
str2);
}
else
{
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%d %s",
value, str2);
}
}
static void
param_pri_ind(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
gchar *str = NULL;
EXACT_DATA_CHECK(len, 1);
oct = tvb_get_guint8(tvb, offset);
switch ((oct & 0xc0) >> 6)
{
case 0x00: str = "Normal"; break;
case 0x01: str = "Interactive"; break;
case 0x10: str = "Urgent"; break;
case 0x11: str = "Emergency"; break;
}
my_decode_bitfield_value(bigbuf, oct, 0xc0, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : %s",
bigbuf,
str);
my_decode_bitfield_value(bigbuf, oct, 0x3f, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Reserved",
bigbuf);
}
static void
param_priv_ind(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
gchar *str = NULL;
EXACT_DATA_CHECK(len, 1);
oct = tvb_get_guint8(tvb, offset);
switch ((oct & 0xc0) >> 6)
{
case 0: str = "Not restricted (privacy level 0)"; break;
case 1: str = "Restricted (privacy level 1)"; break;
case 2: str = "Confidential (privacy level 2)"; break;
case 3: str = "Secret (privacy level 3)"; break;
}
my_decode_bitfield_value(bigbuf, oct, 0xc0, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : %s",
bigbuf,
str);
my_decode_bitfield_value(bigbuf, oct, 0x3f, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Reserved",
bigbuf);
}
static void
param_reply_opt(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
EXACT_DATA_CHECK(len, 1);
oct = tvb_get_guint8(tvb, offset);
my_decode_bitfield_value(bigbuf, oct, 0x80, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : %s",
bigbuf,
(oct & 0x80) ? "User (manual) acknowledgment is requested" : "No user (manual) acknowledgement is requested");
my_decode_bitfield_value(bigbuf, oct, 0x40, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : %s",
bigbuf,
(oct & 0x40) ? "Delivery acknowledgment requested" : "No delivery acknowledgment requested");
my_decode_bitfield_value(bigbuf, oct, 0x3f, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Reserved",
bigbuf);
}
static void
param_num_messages(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
EXACT_DATA_CHECK(len, 1);
oct = tvb_get_guint8(tvb, offset);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"Number of voice mail messages, %d%d",
(oct & 0xf0) >> 4,
oct & 0x0f);
}
static void
param_alert(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
gchar *str = NULL;
EXACT_DATA_CHECK(len, 1);
oct = tvb_get_guint8(tvb, offset);
switch ((oct & 0xc0) >> 6)
{
case 0: str = "Use Mobile default alert"; break;
case 1: str = "Use Low-priority alert"; break;
case 2: str = "Use Medium-priority alert"; break;
case 3: str = "Use High-priority alert"; break;
}
my_decode_bitfield_value(bigbuf, oct, 0xc0, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : %s",
bigbuf,
str);
my_decode_bitfield_value(bigbuf, oct, 0x3f, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Reserved",
bigbuf);
}
static void
param_lang_ind(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
gchar *str = NULL;
EXACT_DATA_CHECK(len, 1);
oct = tvb_get_guint8(tvb, offset);
switch (oct)
{
case 0x00: str = "Unknown or unspecified"; break;
case 0x01: str = "English"; break;
case 0x02: str = "French"; break;
case 0x03: str = "Spanish"; break;
case 0x04: str = "Japanese"; break;
case 0x05: str = "Korean"; break;
case 0x06: str = "Chinese"; break;
case 0x07: str = "Hebrew"; break;
default: str = "Reserved"; break;
}
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s",
str);
}
static void
param_cb_num(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct, oct2, num_fields, odd;
guint32 saved_offset;
guint32 required_octs;
guint32 i;
SHORT_DATA_CHECK(len, 2);
oct = tvb_get_guint8(tvb, offset);
my_decode_bitfield_value(bigbuf, oct, 0x80, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Digit mode, %s",
bigbuf,
(oct & 0x80) ? "8-bit ASCII" : "4-bit DTMF");
if (oct & 0x80)
{
my_decode_bitfield_value(bigbuf, oct, 0x70, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Type of number (%d)",
bigbuf,
(oct & 0x70) >> 4);
my_decode_bitfield_value(bigbuf, oct, 0x0f, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Numbering plan (%d)",
bigbuf,
oct & 0x0f);
offset++;
num_fields = tvb_get_guint8(tvb, offset);
my_decode_bitfield_value(bigbuf, oct, 0xff, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Number of fields (%d)",
bigbuf,
num_fields);
if (num_fields == 0) return;
if (num_fields > (len - 2))
{
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"Missing %d octet(s) for number of fields",
(num_fields + 2) - len);
return;
}
offset++;
i = 0;
while (i < num_fields)
{
bigbuf[i] = tvb_get_guint8(tvb, offset+i) & 0x7f;
i++;
}
bigbuf[i] = '\0';
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, num_fields,
"Number, %s",
bigbuf);
}
else
{
offset++;
num_fields = (oct & 0x7f) << 1;
oct2 = tvb_get_guint8(tvb, offset);
num_fields |= ((oct2 & 0x80) >> 7);
my_decode_bitfield_value(bigbuf, oct, 0x7f, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset-1, 1,
"%s : Number of fields (%d)",
bigbuf,
num_fields);
my_decode_bitfield_value(bigbuf, oct2, 0x80, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Number of fields",
bigbuf);
odd = FALSE;
if (num_fields > 0)
{
i = (num_fields - 1) * 4;
required_octs = (i / 8) + ((i % 8) ? 1 : 0);
if (required_octs + 2 > len)
{
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"Missing %d octet(s) for number of fields",
(required_octs + 2) - len);
return;
}
odd = num_fields & 0x01;
memset((void *) bigbuf, 0, sizeof(bigbuf));
saved_offset = offset;
offset++;
i = 0;
while (i < num_fields)
{
bigbuf[i] =
((oct & 0x78) >> 3) |
0x30;
if (!odd)
{
oct2 = tvb_get_guint8(tvb, offset);
offset++;
i++;
bigbuf[i] =
((oct & 0x07) << 1) |
((oct2 & 0x80) >> 7) |
0x30;
oct = oct2;
}
i++;
}
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, saved_offset, offset - saved_offset,
"Number, %s",
bigbuf);
}
my_decode_bitfield_value(bigbuf, oct, odd ? 0x07: 0x7f, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Reserved",
bigbuf);
}
}
static void
param_disp_mode(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset)
{
guint8 oct;
gchar *str = NULL;
EXACT_DATA_CHECK(len, 1);
oct = tvb_get_guint8(tvb, offset);
switch ((oct & 0xc0) >> 6)
{
case 0x00: str = "Immediate Display: The mobile station is to display the received message as soon as possible."; break;
case 0x01: str = "Mobile default setting: The mobile station is to display the received message based on a pre-defined mode in the mobile station."; break;
case 0x10: str = "User Invoke: The mobile station is to display the received message based on the mode selected by the user."; break;
case 0x11: str = "Reserved"; break;
}
my_decode_bitfield_value(bigbuf, oct, 0xc0, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : %s",
bigbuf,
str);
my_decode_bitfield_value(bigbuf, oct, 0x3f, 8);
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, offset, 1,
"%s : Reserved",
bigbuf);
}
#define NUM_PARAM (sizeof(ansi_param_strings)/sizeof(value_string))
static gint ett_ansi_param[NUM_PARAM];
static void (*ansi_637_param_fcn[])(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset) = {
NULL, /* Message Identifier */
param_user_data, /* User Data */
param_rsp_code, /* User Response Code */
param_timestamp, /* Message Center Time Stamp */
param_timestamp, /* Validity Period Absolute */
param_rel_timestamp, /* Validity Period Relative */
param_timestamp, /* Deferred Delivery Time - Absolute */
param_rel_timestamp, /* Deferred Delivery Time - Relative */
param_pri_ind, /* Priority Indicator */
param_priv_ind, /* Privacy Indicator */
param_reply_opt, /* Reply Option */
param_num_messages, /* Number of Messages */
param_alert, /* Alert on Message Delivery */
param_lang_ind, /* Language Indicator */
param_cb_num, /* Call-Back Number */
param_disp_mode, /* Message Display Mode */
NULL, /* Multiple Encoding User Data */
NULL, /* NONE */
};
/* GENERIC IS-637 DISSECTOR FUNCTIONS */
static gboolean
dissect_ansi_637_param(tvbuff_t *tvb, proto_tree *tree, guint32 *offset)
{
void (*param_fcn)(tvbuff_t *tvb, proto_tree *tree, guint len, guint32 offset) = NULL;
guint8 oct;
guint8 len;
guint32 curr_offset;
gint ett_param_idx, idx;
proto_tree *subtree;
proto_item *item;
gchar *str = NULL;
curr_offset = *offset;
oct = tvb_get_guint8(tvb, curr_offset);
str = my_match_strval((guint32) oct, ansi_param_strings, &idx);
if (NULL == str)
{
return(FALSE);
}
ett_param_idx = ett_ansi_param[idx];
param_fcn = ansi_637_param_fcn[idx];
item =
proto_tree_add_none_format(tree, hf_ansi_637_none,
tvb, curr_offset, -1, str);
subtree = proto_item_add_subtree(item, ett_param_idx);
proto_tree_add_uint(subtree, hf_ansi_637_subparam_id,
tvb, curr_offset, 1, oct);
curr_offset++;
len = tvb_get_guint8(tvb, curr_offset);
proto_item_set_len(item, (curr_offset - *offset) + len + 1);
proto_tree_add_uint(subtree, hf_ansi_637_length,
tvb, curr_offset, 1, len);
curr_offset++;
if (len > 0)
{
if (param_fcn == NULL)
{
proto_tree_add_none_format(subtree, hf_ansi_637_none,
tvb, curr_offset, len, "Parameter Data");
}
else
{
(*param_fcn)(tvb, subtree, len, curr_offset);
}
curr_offset += len;
}
*offset = curr_offset;
return(TRUE);
}
static void
dissect_ansi_637_message(tvbuff_t *tvb, proto_tree *ansi_637_tree)
{
guint8 oct;
guint8 len;
guint32 octs;
guint32 curr_offset;
guint32 msg_id;
guint32 msg_type;
gchar *str = NULL;
proto_item *item;
proto_tree *subtree;
oct = tvb_get_guint8(tvb, 0);
if (oct != 0x00)
{
return;
}
len = tvb_get_guint8(tvb, 1);
if (len != 3)
{
return;
}
octs = tvb_get_ntoh24(tvb, 2);
msg_type = (octs >> 20) & 0x0f;
msg_id = (octs >> 4) & 0xffff;
str = match_strval(msg_type, ansi_msg_type_strings);
/*
* do not append to COL_INFO
*/
item =
proto_tree_add_none_format(ansi_637_tree, hf_ansi_637_none,
tvb, 0, -1, str);
subtree = proto_item_add_subtree(item, ett_params);
proto_tree_add_uint(subtree, hf_ansi_637_subparam_id,
tvb, 0, 1, oct);
proto_tree_add_uint(subtree, hf_ansi_637_length,
tvb, 1, 1, len);
proto_tree_add_uint(subtree, hf_ansi_637_msg_type,
tvb, 2, 3, octs);
proto_tree_add_uint(subtree, hf_ansi_637_msg_id,
tvb, 2, 3, octs);
proto_tree_add_uint(subtree, hf_ansi_637_msg_junk,
tvb, 2, 3, octs);
proto_item_set_len(item, 2 + len);
curr_offset = 2 + len;
len = tvb_length(tvb);
while ((len - curr_offset) > 0)
{
if (!dissect_ansi_637_param(tvb, ansi_637_tree, &curr_offset))
{
proto_tree_add_none_format(ansi_637_tree, hf_ansi_637_none,
tvb, curr_offset, len - curr_offset,
"Unknown Parameter Data");
break;
}
}
}
static void
dissect_ansi_637(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ansi_637_item;
proto_tree *ansi_637_tree = NULL;
gchar *str = NULL;
if (!proto_is_protocol_enabled(proto_ansi_637))
{
call_dissector(data_handle,tvb, pinfo, tree);
return;
}
if (check_col(pinfo->cinfo, COL_PROTOCOL))
{
col_set_str(pinfo->cinfo, COL_PROTOCOL, ansi_proto_name_short);
}
/* In the interest of speed, if "tree" is NULL, don't do any work not
* necessary to generate protocol tree items.
*/
if (tree)
{
/*
* create the ansi_637 protocol tree
*/
str = match_strval(pinfo->match_port, ansi_tele_strings);
if (NULL == str) str = "Unrecognized Teleservice ID";
ansi_637_item =
proto_tree_add_protocol_format(tree, proto_ansi_637, tvb, 0, -1,
"%s %s (%d)",
ansi_proto_name,
str,
pinfo->match_port);
ansi_637_tree =
proto_item_add_subtree(ansi_637_item, ett_ansi_637);
dissect_ansi_637_message(tvb, ansi_637_tree);
}
}
/* Register the protocol with Ethereal */
void
proto_register_ansi_637(void)
{
guint i;
/* Setup list of header fields */
static hf_register_info hf[] =
{
{ &hf_ansi_637_msg_type,
{ "Message Type",
"ansi_637.msg_type",
FT_UINT24, BASE_DEC, VALS(ansi_msg_type_strings), 0xf00000,
"", HFILL }},
{ &hf_ansi_637_msg_id,
{ "Message ID",
"ansi_637.msg_id",
FT_UINT24, BASE_DEC, NULL, 0x0ffff0,
"", HFILL }},
{ &hf_ansi_637_msg_junk,
{ "Reserved",
"ansi_637.msg_junk",
FT_UINT24, BASE_DEC, NULL, 0x00000f,
"", HFILL }},
{ &hf_ansi_637_length,
{ "Length", "ansi_637.len",
FT_UINT8, BASE_DEC, NULL, 0,
"", HFILL }
},
{ &hf_ansi_637_none,
{ "Sub tree", "ansi_637.none",
FT_NONE, 0, 0, 0,
"", HFILL }
},
{ &hf_ansi_637_subparam_id,
{ "Subparam ID", "ansi_637.subparam_id",
FT_UINT8, BASE_DEC, VALS(ansi_param_strings), 0,
"", HFILL }
},
};
/* Setup protocol subtree array */
#define NUM_INDIVIDUAL_PARAMS 2
static gint *ett[NUM_INDIVIDUAL_PARAMS+NUM_PARAM];
memset((void *) ett, 0, sizeof(ett));
ett[0] = &ett_ansi_637;
ett[1] = &ett_params;
for (i=0; i < NUM_PARAM; i++)
{
ett_ansi_param[i] = -1;
ett[NUM_INDIVIDUAL_PARAMS+i] = &ett_ansi_param[i];
}
/* Register the protocol name and description */
proto_ansi_637 =
proto_register_protocol(ansi_proto_name, "ANSI IS-637-A", "ansi_637");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_ansi_637, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_ansi_637(void)
{
dissector_handle_t ansi_637_handle;
guint i;
ansi_637_handle = create_dissector_handle(dissect_ansi_637, proto_ansi_637);
/*
* register for all known teleservices
* '-1' is to stop before trailing '0' entry
*
* to add teleservices, modify 'ansi_tele_strings'
*/
for (i=0; i < ((sizeof(ansi_tele_strings)/sizeof(value_string))-1); i++)
{
/*
* ANSI MAP dissector will push out teleservice ids
*/
dissector_add("ansi_map.tele_id", ansi_tele_strings[i].value, ansi_637_handle);
/*
* ANSI A-interface dissector will push out teleservice ids after
* transport layer dissection
*
* This is for IOS or IS-634 variants.
*/
/* dissector_add("ansi_a.tele_id", ansi_tele_strings[i].value, ansi_637_handle); */
}
data_handle = find_dissector("data");
}
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