2009-01-07 07:21:31 +00:00
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/* dct3trace.c
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* Routines for reading signalling traces generated by Gammu (www.gammu.org)
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* from Nokia DCT3 phones in Netmonitor mode.
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*
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2009-06-24 20:27:58 +00:00
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* gammu --nokiadebug nhm5_587.txt v18-19
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2009-01-07 07:21:31 +00:00
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*
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* Duncan Salerno <duncan.salerno@googlemail.com>
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*
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* $Id$
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "wtap-int.h"
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#include "buffer.h"
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#include "dct3trace.h"
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#include "file_wrappers.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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/*
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Example downlink data:
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<?xml version="1.0"?>
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<dump>
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<l1 direction="down" logicalchannel="96" physicalchannel="19" sequence="268116" error="0" timeshift="2992" bsic="22" data="31063F100DD0297A53E1020103C802398E0B2B2B2B2B2B" >
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<l2 data="063F100DD0297A53E1020103" rest="C802398E0B2B2B2B2B2B" >
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</l2>
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</l1>
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</dump>
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Example uplink data (no raw L1):
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<?xml version="1.0"?>
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<dump>
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<l1 direction="up" logicalchannel="112" >
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<l2 type="U" subtype="Unknown" p="0" data="061500400000000000000000000000000000" >
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</l2>
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</l1>
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</dump>
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*/
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/* Magic text to check */
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static const char dct3trace_magic_line1[] = "<?xml version=\"1.0\"?>";
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static const char dct3trace_magic_line2[] = "<dump>";
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static const char dct3trace_magic_record_start[] = "<l1 ";
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static const char dct3trace_magic_record_end[] = "</l1>";
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static const char dct3trace_magic_l2_start[] = "<l2 ";
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static const char dct3trace_magic_l2_end[] = "</l2>";
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static const char dct3trace_magic_end[] = "</dump>";
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2009-06-24 20:27:58 +00:00
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#define MAX_PACKET_LEN 23
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2009-01-07 07:21:31 +00:00
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static gboolean dct3trace_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean dct3trace_seek_read(wtap *wth, gint64 seek_off,
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union wtap_pseudo_header *pseudo_header, guint8 *pd, int len,
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int *err, gchar **err_info);
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/*
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* Following 3 functions taken from gsmdecode-0.7bis, with permission - http://wiki.thc.org/gsm
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*/
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static int
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hc2b(unsigned char hex)
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{
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hex = tolower(hex);
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if ((hex >= '0') && (hex <= '9'))
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return hex - '0';
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if ((hex >= 'a') && (hex <= 'f'))
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return hex - 'a' + 10;
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return -1;
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}
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static int
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hex2bin(unsigned char *out, unsigned char *in)
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{
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unsigned char *out_start = out;
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unsigned char *end = in + strlen((char *)in);
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int is_low = 0;
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int c;
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2009-06-24 20:27:58 +00:00
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/* Clamp to maximum packet size */
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if (end - in > MAX_PACKET_LEN*2) /* As we're reading nibbles */
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end = in + MAX_PACKET_LEN*2;
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2009-01-07 07:21:31 +00:00
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while (in < end)
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{
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c = hc2b(in[0]);
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if (c < 0)
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{
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in++;
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continue;
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}
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if (is_low == 0)
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{
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out[0] = c << 4;
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is_low = 1;
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} else {
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out[0] |= (c & 0x0f);
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is_low = 0;
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out++;
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}
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in++;
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}
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2009-03-07 05:13:44 +00:00
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return (int)(out - out_start);
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2009-01-07 07:21:31 +00:00
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}
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static int
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xml_get_int(int *val, const unsigned char *str, const unsigned char *pattern)
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{
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2010-02-23 01:23:39 +00:00
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const char *ptr;
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2009-01-07 07:21:31 +00:00
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char *start, *end;
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char buf[32];
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ptr = strstr((char *)str, (char *)pattern);
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if (ptr == NULL)
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return -1;
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start = strchr(ptr, '"');
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if (start == NULL)
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return -2;
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start++;
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end = strchr(start, '"');
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if (end == NULL)
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return -3;
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2009-06-24 20:27:58 +00:00
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if (end - start > 31)
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return -4;
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2009-01-07 07:21:31 +00:00
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memcpy(buf, start, end - start);
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buf[end - start] = '\0';
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*val = atoi(buf);
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return 0;
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}
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/* Look through the first part of a file to see if this is
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* a DCT3 trace file.
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*
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* Returns TRUE if it is, FALSE if it isn't or if we get an I/O error;
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* if we get an I/O error, "*err" will be set to a non-zero value.
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*/
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static gboolean dct3trace_check_file_type(wtap *wth, int *err)
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{
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char line1[64], line2[64];
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if (file_gets(line1, sizeof(line1), wth->fh) != NULL &&
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file_gets(line2, sizeof(line2), wth->fh) != NULL)
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{
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/* Don't compare line endings */
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if( strncmp(dct3trace_magic_line1, line1, strlen(dct3trace_magic_line1)) == 0 &&
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strncmp(dct3trace_magic_line2, line2, strlen(dct3trace_magic_line2)) == 0)
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{
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return TRUE;
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}
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}
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/* EOF or error. */
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else
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{
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if (file_eof(wth->fh))
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*err = 0;
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else
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*err = file_error(wth->fh);
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}
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return FALSE;
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}
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int dct3trace_open(wtap *wth, int *err, gchar **err_info _U_)
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{
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/* Look for Gammu DCT3 trace header */
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if (!dct3trace_check_file_type(wth, err))
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{
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if (*err == 0)
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return 0;
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else
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return -1;
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}
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wth->data_offset = 0;
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wth->file_encap = WTAP_ENCAP_GSM_UM;
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wth->file_type = WTAP_FILE_DCT3TRACE;
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wth->snapshot_length = 0; /* not known */
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wth->subtype_read = dct3trace_read;
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wth->subtype_seek_read = dct3trace_seek_read;
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wth->tsprecision = WTAP_FILE_TSPREC_SEC;
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return 1;
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}
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2010-02-23 01:23:39 +00:00
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static gboolean dct3trace_get_packet(FILE_T fh, union wtap_pseudo_header *pseudo_header,
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2009-01-07 07:21:31 +00:00
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unsigned char *buf, int *len, int *err, gchar **err_info)
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{
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unsigned char line[1024];
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gboolean have_data = FALSE;
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while (file_gets(line, sizeof(line), fh) != NULL)
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{
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if( memcmp(dct3trace_magic_end, line, strlen(dct3trace_magic_end)) == 0 )
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{
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/* Return on end of file </dump> */
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*err = 0;
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return FALSE;
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}
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else if( memcmp(dct3trace_magic_record_end, line, strlen(dct3trace_magic_record_end)) == 0 )
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{
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/* Return on end of record </l1> */
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if( have_data )
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{
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*err = 0;
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return TRUE;
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}
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else
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{
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/* If not got any data return error */
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup_printf("dct3trace: record without data");
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return FALSE;
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}
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}
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else if( memcmp(dct3trace_magic_record_start, line, strlen(dct3trace_magic_record_start)) == 0 )
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{
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/* Parse L1 header <l1 ...>*/
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int channel, tmp, ret = 0;
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char *ptr;
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pseudo_header->gsm_um.uplink = !strstr(line, "direction=\"down\"");
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ret |= xml_get_int(&channel, line, "logicalchannel");
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/* Parse downlink only fields */
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if( !pseudo_header->gsm_um.uplink )
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{
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ret |= xml_get_int(&tmp, line, "physicalchannel");
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pseudo_header->gsm_um.arfcn = tmp;
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ret |= xml_get_int(&tmp, line, "sequence");
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pseudo_header->gsm_um.tdma_frame = tmp;
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ret |= xml_get_int(&tmp, line, "bsic");
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pseudo_header->gsm_um.bsic = tmp;
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ret |= xml_get_int(&tmp, line, "error");
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pseudo_header->gsm_um.error = tmp;
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ret |= xml_get_int(&tmp, line, "timeshift");
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pseudo_header->gsm_um.timeshift = tmp;
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}
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if( ret != 0 )
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{
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*err = WTAP_ERR_BAD_RECORD;
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*err_info = g_strdup_printf("dct3trace: record missing mandatory attributes");
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return FALSE;
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}
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switch( channel )
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{
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case 128: pseudo_header->gsm_um.channel = GSM_UM_CHANNEL_SDCCH; break;
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case 112: pseudo_header->gsm_um.channel = GSM_UM_CHANNEL_SACCH; break;
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case 176: pseudo_header->gsm_um.channel = GSM_UM_CHANNEL_FACCH; break;
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case 96: pseudo_header->gsm_um.channel = GSM_UM_CHANNEL_CCCH; break;
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case 80: pseudo_header->gsm_um.channel = GSM_UM_CHANNEL_BCCH; break;
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default: pseudo_header->gsm_um.channel = GSM_UM_CHANNEL_UNKNOWN; break;
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}
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/* Read data (if have it) into buf */
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ptr = strstr(line, "data=\"");
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if( ptr )
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{
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have_data = TRUE; /* If has data... */
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*len = hex2bin(buf, ptr+6);
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}
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}
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else if( !have_data && memcmp(dct3trace_magic_l2_start, line, strlen(dct3trace_magic_l2_start)) == 0 )
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{
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2009-06-24 20:27:58 +00:00
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/* For uplink packets we might not get the raw L1, so have to recreate it from the L2 */
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2009-01-07 07:21:31 +00:00
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/* Parse L2 header if didn't get data from L1 <l2 ...> */
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int data_len = 0;
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char *ptr = strstr(line, "data=\"");
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if( !ptr )
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{
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continue;
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}
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have_data = TRUE;
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if( pseudo_header->gsm_um.channel == GSM_UM_CHANNEL_SACCH || pseudo_header->gsm_um.channel == GSM_UM_CHANNEL_FACCH || pseudo_header->gsm_um.channel == GSM_UM_CHANNEL_SDCCH )
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{
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/* Add LAPDm B header */
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memset(buf, 0x1, 2);
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*len = 3;
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}
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else
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{
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/* Add LAPDm Bbis header */
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*len = 1;
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}
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buf += *len;
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data_len = hex2bin(buf, ptr+6);
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*len += data_len;
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/* Add LAPDm length byte */
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*(buf - 1) = data_len << 2 | 0x1;
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}
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}
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*err = file_error(fh);
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if (*err == 0)
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{
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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/* Find the next packet and parse it; called from wtap_read(). */
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static gboolean dct3trace_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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guint64 offset = file_tell(wth->fh);
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int buf_len;
|
2009-10-18 21:29:44 +00:00
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unsigned char buf[MAX_PACKET_LEN];
|
2009-01-07 07:21:31 +00:00
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if( !dct3trace_get_packet(wth->fh, &wth->pseudo_header, buf, &buf_len, err, err_info) )
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{
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return FALSE;
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}
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/* We've got a full packet! */
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wth->phdr.ts.secs = 0;
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wth->phdr.ts.nsecs = 0;
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wth->phdr.caplen = buf_len;
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|
|
wth->phdr.len = buf_len;
|
|
|
|
|
|
|
|
/* Make sure we have enough room for the packet */
|
|
|
|
buffer_assure_space(wth->frame_buffer, buf_len);
|
|
|
|
memcpy( buffer_start_ptr(wth->frame_buffer), buf, buf_len );
|
|
|
|
|
|
|
|
wth->data_offset = *data_offset = offset;
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* Used to read packets in random-access fashion */
|
|
|
|
static gboolean dct3trace_seek_read (wtap *wth, gint64 seek_off,
|
|
|
|
union wtap_pseudo_header *pseudo_header, guint8 *pd, int len,
|
|
|
|
int *err, gchar **err_info)
|
|
|
|
{
|
|
|
|
int buf_len;
|
2009-10-18 21:29:44 +00:00
|
|
|
unsigned char buf[MAX_PACKET_LEN];
|
2009-01-07 07:21:31 +00:00
|
|
|
|
|
|
|
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
|
|
|
|
{
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if( !dct3trace_get_packet(wth->random_fh, pseudo_header, buf, &buf_len, err, err_info) )
|
|
|
|
{
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if( len != buf_len && len != -1 )
|
|
|
|
{
|
|
|
|
*err = WTAP_ERR_BAD_RECORD;
|
|
|
|
*err_info = g_strdup_printf("dct3trace: requested length %d doesn't match record length %d",
|
|
|
|
len, buf_len);
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy( pd, buf, buf_len );
|
|
|
|
return TRUE;
|
|
|
|
}
|