1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
/* netxray.c
*
* $Id: netxray.c,v 1.8 1999/07/13 02:53:25 gram Exp $
*
* Wiretap Library
* Copyright (c) 1998 by Gilbert Ramirez <gram@verdict.uthscsa.edu>
*
* 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 <stdlib.h>
#include <time.h>
#include "wtap.h"
#include "netxray.h"
#include "buffer.h"
/* Capture file header, *including* magic number, is padded to 128 bytes. */
#define CAPTUREFILE_HEADER_SIZE 128
/* Magic number in NetXRay files. */
static const char netxray_magic[] = { /* magic header */
'X', 'C', 'P', '\0'
};
/* NetXRay file header (minus magic number). */
struct netxray_hdr {
char version[8]; /* version number */
guint32 start_time; /* UNIX time when capture started */
guint32 xxx[2]; /* unknown */
guint32 start_offset; /* offset of first packet in capture */
guint32 end_offset; /* offset after last packet in capture */
guint32 xxy[3]; /* unknown */
guint16 network; /* datalink type */
guint8 xxz[6];
guint32 timelo; /* lower 32 bits of time stamp of capture start */
guint32 timehi; /* upper 32 bits of time stamp of capture start */
/*
* XXX - other stuff.
*/
};
/* Version number strings. */
static const char vers_1_0[] = {
'0', '0', '1', '.', '0', '0', '0', '\0'
};
static const char vers_1_1[] = {
'0', '0', '1', '.', '1', '0', '0', '\0'
};
static const char vers_2_001[] = {
'0', '0', '2', '.', '0', '0', '1', '\0'
};
/* NetXRay 1.x data record format - followed by frame data. */
struct netxrayrec_1_x_hdr {
guint32 timelo; /* lower 32 bits of time stamp */
guint32 timehi; /* upper 32 bits of time stamp */
guint16 orig_len; /* packet length */
guint16 incl_len; /* capture length */
guint32 xxx[4]; /* unknown */
};
/* NetXRay 2.x data record format - followed by frame data. */
struct netxrayrec_2_x_hdr {
guint32 timelo; /* lower 32 bits of time stamp */
guint32 timehi; /* upper 32 bits of time stamp */
guint16 orig_len; /* packet length */
guint16 incl_len; /* capture length */
guint32 xxx[7]; /* unknown */
};
/* Returns WTAP_FILE_NETXRAY on success, WTAP_FILE_UNKNOWN on failure */
int netxray_open(wtap *wth)
{
int bytes_read;
char magic[sizeof netxray_magic];
struct netxray_hdr hdr;
double timeunit;
int version_major;
double t;
static const int netxray_encap[] = {
WTAP_ENCAP_ETHERNET,
WTAP_ENCAP_TR,
WTAP_ENCAP_FDDI,
WTAP_ENCAP_NONE, /* WAN */
WTAP_ENCAP_NONE, /* LocalTalk */
WTAP_ENCAP_NONE, /* "DIX" - should not occur */
WTAP_ENCAP_NONE, /* ARCNET raw */
WTAP_ENCAP_NONE, /* ARCNET 878.2 */
WTAP_ENCAP_NONE, /* ATM */
WTAP_ENCAP_NONE, /* Wireless WAN */
WTAP_ENCAP_NONE /* IrDA */
};
#define NUM_NETXRAY_ENCAPS (sizeof netxray_encap / sizeof netxray_encap[0])
/* Read in the string that should be at the start of a NetXRay
* file */
fseek(wth->fh, 0, SEEK_SET);
bytes_read = fread(magic, 1, sizeof magic, wth->fh);
if (bytes_read != sizeof magic) {
return WTAP_FILE_UNKNOWN;
}
if (memcmp(magic, netxray_magic, sizeof netxray_magic) != 0) {
return WTAP_FILE_UNKNOWN;
}
/* Read the rest of the header. */
bytes_read = fread(&hdr, 1, sizeof hdr, wth->fh);
if (bytes_read != sizeof hdr) {
return WTAP_FILE_UNKNOWN;
}
/* It appears that version 1.1 files (as produced by Windows
* Sniffer Pro 2.0.01) have the time stamp in microseconds,
* rather than the milliseconds version 1.0 files appear to have.
*
* It also appears that version 2.001 files (as produced by
* Windows(?) Sniffer Pro 2.50.05) have per-packet headers with
* some extra fields. */
if (memcmp(hdr.version, vers_1_0, sizeof vers_1_0) == 0) {
timeunit = 1000.0;
version_major = 1;
} else if (memcmp(hdr.version, vers_1_1, sizeof vers_1_1) == 0) {
timeunit = 1000000.0;
version_major = 1;
} else if (memcmp(hdr.version, vers_2_001, sizeof vers_2_001) == 0) {
timeunit = 1000000.0;
version_major = 2;
} else {
return WTAP_FILE_UNKNOWN;
}
hdr.network = pletohs(&hdr.network);
if (hdr.network >= NUM_NETXRAY_ENCAPS) {
g_error("netxray: network type %d unknown", hdr.network);
return WTAP_FILE_UNKNOWN;
}
/* This is a netxray file */
wth->capture.netxray = g_malloc(sizeof(netxray_t));
wth->subtype_read = netxray_read;
wth->file_encap = netxray_encap[hdr.network];
wth->snapshot_length = 16384; /* XXX - not available in header */
wth->capture.netxray->start_time = pletohl(&hdr.start_time);
wth->capture.netxray->timeunit = timeunit;
t = (double)pletohl(&hdr.timelo)
+ (double)pletohl(&hdr.timehi)*4294967296.0;
t = t/timeunit;
wth->capture.netxray->start_timestamp = t;
wth->capture.netxray->version_major = version_major;
/*wth->frame_number = 0;*/
/*wth->file_byte_offset = 0x10b;*/
/* Remember the offset after the last packet in the capture (which
* isn't necessarily the last packet in the file), as it appears
* there's sometimes crud after it. */
wth->capture.netxray->wrapped = 0;
wth->capture.netxray->end_offset = pletohl(&hdr.end_offset);
/* Seek to the beginning of the data records. */
fseek(wth->fh, pletohl(&hdr.start_offset), SEEK_SET);
return WTAP_FILE_NETXRAY;
}
/* Read the next packet */
int netxray_read(wtap *wth)
{
int packet_size;
int bytes_read;
union {
struct netxrayrec_1_x_hdr hdr_1_x;
struct netxrayrec_2_x_hdr hdr_2_x;
} hdr;
int hdr_size = 0;
int data_offset;
double t;
reread:
/* Have we reached the end of the packet data? */
data_offset = ftell(wth->fh);
if (data_offset == wth->capture.netxray->end_offset) {
/* Yes. */
return 0;
}
/* Read record header. */
switch (wth->capture.netxray->version_major) {
case 1:
hdr_size = sizeof (struct netxrayrec_1_x_hdr);
break;
case 2:
hdr_size = sizeof (struct netxrayrec_2_x_hdr);
break;
}
bytes_read = fread(&hdr, 1, hdr_size, wth->fh);
if (bytes_read != hdr_size) {
if (bytes_read != 0) {
g_error("netxray_read: not enough packet header data (%d bytes)",
bytes_read);
return -1;
}
/* We're at EOF. Wrap? */
if (!wth->capture.netxray->wrapped) {
/* Yes. Remember that we did. */
wth->capture.netxray->wrapped = 1;
fseek(wth->fh, CAPTUREFILE_HEADER_SIZE, SEEK_SET);
goto reread;
}
/* We've already wrapped - don't wrap again. */
return 0;
}
data_offset += hdr_size;
packet_size = pletohs(&hdr.hdr_1_x.incl_len);
buffer_assure_space(wth->frame_buffer, packet_size);
bytes_read = fread(buffer_start_ptr(wth->frame_buffer), 1,
packet_size, wth->fh);
if (bytes_read != packet_size) {
if (ferror(wth->fh)) {
g_error("netxray_read: fread for data: read error\n");
} else {
g_error("netxray_read: fread for data: %d bytes out of %d",
bytes_read, packet_size);
}
return -1;
}
t = (double)pletohl(&hdr.hdr_1_x.timelo)
+ (double)pletohl(&hdr.hdr_1_x.timehi)*4294967296.0;
t /= wth->capture.netxray->timeunit;
t -= wth->capture.netxray->start_timestamp;
wth->phdr.ts.tv_sec = wth->capture.netxray->start_time + (long)t;
wth->phdr.ts.tv_usec = (unsigned long)((t-(double)(unsigned long)(t))
*1.0e6);
wth->phdr.caplen = packet_size;
wth->phdr.len = pletohs(&hdr.hdr_1_x.orig_len);
wth->phdr.pkt_encap = wth->file_encap;
return data_offset;
}
|
