![Guy Harris](/assets/img/avatar_default.png)
Change-Id: I3aa2f4a6e25f610e0e9236835bbcb588eeb15c08 Reviewed-on: https://code.wireshark.org/review/17602 Reviewed-by: Guy Harris <guy@alum.mit.edu>
416 lines
11 KiB
C
416 lines
11 KiB
C
/* 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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* gammu --nokiadebug nhm5_587.txt v18-19
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*
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* Duncan Salerno <duncan.salerno@googlemail.com>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "wtap-int.h"
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#include "dct3trace.h"
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#include "file_wrappers.h"
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <wsutil/strtoi.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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#if 0 /* Not used ?? */
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static const char dct3trace_magic_l2_end[] = "</l2>";
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#endif
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static const char dct3trace_magic_end[] = "</dump>";
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#define MAX_PACKET_LEN 23
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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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struct wtap_pkthdr *phdr, Buffer *buf, 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 = g_ascii_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(guint8 *out, guint8 *out_end, char *in)
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{
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guint8 *out_start = out;
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int is_low = 0;
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int c;
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while (*in != '\0')
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{
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c = hc2b(*(unsigned char *)in);
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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 (out == out_end)
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{
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/* Too much data */
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return -1;
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}
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if (is_low == 0)
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{
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*out = c << 4;
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is_low = 1;
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} else {
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*out |= (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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return (int)(out - out_start);
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}
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static gboolean
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xml_get_int(int *val, const char *str, const char *pattern, int *err, gchar **err_info)
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{
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const char *ptr, *endptr;
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char *start, *end;
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char buf[32];
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ptr = strstr(str, pattern);
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if (ptr == NULL) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("dct3trace: %s not found", pattern);
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return FALSE;
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}
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/*
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* XXX - should we just skip past the pattern and check for ="?
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*/
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start = strchr(ptr, '"');
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if (start == NULL) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("dct3trace: opening quote for %s not found", pattern);
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return FALSE;
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}
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start++;
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/*
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* XXX - should we just use ws_strtoi32() and check whether
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* the character following the number is a "?
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*/
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end = strchr(start, '"');
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if (end == NULL) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("dct3trace: closing quote for %s not found", pattern);
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return FALSE;
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}
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if (end - start > 31) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("dct3trace: %s value is too long", pattern);
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return FALSE;
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}
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memcpy(buf, start, end - start);
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buf[end - start] = '\0';
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/*
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* XXX - should we allow negative numbers in all cases? Or are
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* there cases where the number is unsigned?
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*/
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if (!ws_strtoi32(buf, &endptr, val)) {
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*err = WTAP_ERR_BAD_FILE;
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if (errno == ERANGE) {
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if (*val < 0)
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*err_info = g_strdup_printf("dct3trace: %s value is too small, minimum is %d", pattern, *val);
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else
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*err_info = g_strdup_printf("dct3trace: %s value is too large, maximum is %d", pattern, *val);
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} else
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*err_info = g_strdup_printf("dct3trace: %s value \"%s\" not a number", pattern, buf);
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return FALSE;
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}
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if (*endptr != '\0') {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("dct3trace: %s value \"%s\" not a number", pattern, buf);
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return FALSE;
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}
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return TRUE;
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}
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wtap_open_return_val dct3trace_open(wtap *wth, int *err, gchar **err_info)
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{
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char line1[64], line2[64];
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/* Look for Gammu DCT3 trace header */
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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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*err = file_error(wth->fh, err_info);
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return WTAP_OPEN_ERROR;
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return WTAP_OPEN_NOT_MINE;
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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 WTAP_OPEN_NOT_MINE;
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}
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wth->file_encap = WTAP_ENCAP_GSM_UM;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_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->file_tsprec = WTAP_TSPREC_SEC;
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return WTAP_OPEN_MINE;
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}
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static gboolean dct3trace_get_packet(FILE_T fh, struct wtap_pkthdr *phdr,
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Buffer *buf, int *err, gchar **err_info)
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{
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char line[1024];
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guint8 databuf[MAX_PACKET_LEN], *bufp;
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gboolean have_data = FALSE;
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int len = 0;
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bufp = &databuf[0];
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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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/* We've got a full packet! */
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phdr->rec_type = REC_TYPE_PACKET;
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phdr->presence_flags = 0; /* no time stamp, no separate "on the wire" length */
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phdr->ts.secs = 0;
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phdr->ts.nsecs = 0;
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phdr->caplen = len;
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phdr->len = len;
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*err = 0;
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/* Make sure we have enough room for the packet */
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ws_buffer_assure_space(buf, phdr->caplen);
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memcpy( ws_buffer_start_ptr(buf), databuf, phdr->caplen );
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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_FILE;
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*err_info = g_strdup("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;
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char *ptr;
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phdr->pseudo_header.gsm_um.uplink = !strstr(line, "direction=\"down\"");
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if (!xml_get_int(&channel, line, "logicalchannel", err, err_info))
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return FALSE;
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/* Parse downlink only fields */
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if( !phdr->pseudo_header.gsm_um.uplink )
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{
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if (!xml_get_int(&tmp, line, "physicalchannel", err, err_info))
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return FALSE;
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phdr->pseudo_header.gsm_um.arfcn = tmp;
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if (!xml_get_int(&tmp, line, "sequence", err, err_info))
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return FALSE;
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phdr->pseudo_header.gsm_um.tdma_frame = tmp;
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if (!xml_get_int(&tmp, line, "bsic", err, err_info))
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return FALSE;
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phdr->pseudo_header.gsm_um.bsic = tmp;
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if (!xml_get_int(&tmp, line, "error", err, err_info))
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return FALSE;
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phdr->pseudo_header.gsm_um.error = tmp;
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if (!xml_get_int(&tmp, line, "timeshift", err, err_info))
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return FALSE;
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phdr->pseudo_header.gsm_um.timeshift = tmp;
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}
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switch( channel )
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{
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case 128: phdr->pseudo_header.gsm_um.channel = GSM_UM_CHANNEL_SDCCH; break;
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case 112: phdr->pseudo_header.gsm_um.channel = GSM_UM_CHANNEL_SACCH; break;
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case 176: phdr->pseudo_header.gsm_um.channel = GSM_UM_CHANNEL_FACCH; break;
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case 96: phdr->pseudo_header.gsm_um.channel = GSM_UM_CHANNEL_CCCH; break;
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case 80: phdr->pseudo_header.gsm_um.channel = GSM_UM_CHANNEL_BCCH; break;
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default: phdr->pseudo_header.gsm_um.channel = GSM_UM_CHANNEL_UNKNOWN; break;
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}
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/* Read data (if have it) into databuf */
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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(bufp, &databuf[MAX_PACKET_LEN], ptr+6);
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if (len == -1)
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{
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("dct3trace: record length %d too long", phdr->caplen);
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return FALSE;
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}
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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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/* For uplink packets we might not get the raw L1, so have to recreate it from the L2 */
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/* Parse L2 header if didn't get data from L1 <l2 ...> */
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int data_len;
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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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/*
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* We know we have no data already, so we know
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* we have enough room for the header.
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*/
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if( phdr->pseudo_header.gsm_um.channel == GSM_UM_CHANNEL_SACCH || phdr->pseudo_header.gsm_um.channel == GSM_UM_CHANNEL_FACCH || phdr->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(bufp, 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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bufp += len;
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data_len = hex2bin(bufp, &databuf[MAX_PACKET_LEN], ptr+6);
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if (data_len == -1)
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{
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("dct3trace: record length %d too long", phdr->caplen);
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return FALSE;
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}
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len += data_len;
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/* Add LAPDm length byte */
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*(bufp - 1) = data_len << 2 | 0x1;
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}
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}
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*err = file_error(fh, err_info);
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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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*data_offset = file_tell(wth->fh);
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return dct3trace_get_packet(wth->fh, &wth->phdr, wth->frame_buffer,
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err, err_info);
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}
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/* Used to read packets in random-access fashion */
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static gboolean dct3trace_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info)
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{
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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{
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return FALSE;
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}
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return dct3trace_get_packet(wth->random_fh, phdr, buf, err, err_info);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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