3 * $Id: ascend.c,v 1.26 2001/11/13 23:55:43 gram Exp $
6 * Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 #include "ascend-int.h"
30 #include "file_wrappers.h"
32 #ifdef HAVE_SYS_STAT_H
43 /* This module reads the output of the 'wandsession', 'wannext',
44 'wandisplay', and similar commands available on Lucent/Ascend access
45 equipment. The output is text, with a header line followed by the
46 packet data. Usage instructions for the commands can be found by
47 searching http://aos.ascend.com . Ascend likes to move their pages
48 around quite a bit, otherwise I'd put a more specific URL here.
50 Example 'wandsess' output data:
52 RECV-iguana:241:(task: B02614C0, time: 1975432.85) 49 octets @ 8003BD94
53 [0000]: FF 03 00 3D C0 06 CA 22 2F 45 00 00 28 6A 3B 40
54 [0010]: 00 3F 03 D7 37 CE 41 62 12 CF 00 FB 08 20 27 00
55 [0020]: 50 E4 08 DD D7 7C 4C 71 92 50 10 7D 78 67 C8 00
57 XMIT-iguana:241:(task: B04E12C0, time: 1975432.85) 53 octets @ 8009EB16
58 [0000]: FF 03 00 3D C0 09 1E 31 21 45 00 00 2C 2D BD 40
59 [0010]: 00 7A 06 D8 B1 CF 00 FB 08 CE 41 62 12 00 50 20
60 [0020]: 29 7C 4C 71 9C 9A 6A 93 A4 60 12 22 38 3F 10 00
61 [0030]: 00 02 04 05 B4
63 Example 'wdd' output data:
65 Date: 01/12/1990. Time: 12:22:33
66 Cause an attempt to place call to 14082750382
67 WD_DIALOUT_DISP: chunk 2515EE type IP.
68 (task: 251790, time: 994953.28) 44 octets @ 2782B8
69 [0000]: 00 C0 7B 71 45 6C 00 60 08 16 AA 51 08 00 45 00
70 [0010]: 00 2C 66 1C 40 00 80 06 53 F6 AC 14 00 18 CC 47
71 [0020]: C8 45 0A 31 00 50 3B D9 5B 75 00 00
73 (note that the capture whence this came dates back to January
74 *1999*; I presume that either the person who sent it to me
75 hadn't bothered keeping its internal clock set, or that its
76 internal clock or the date it displays in those messages
77 is only loosely connected to reality)
79 Note that a maximum of eight rows will be displayed (for a maximum of
80 128 bytes), no matter what the octet count is.
82 When reading a packet, the module prepends an ascend_pkt_hdr to the
87 /* How far into the file we should look for packet headers */
88 #define ASCEND_MAX_SEEK 100000
90 /* XXX Should we replace this with a more generalized array? */
91 /* Magic numbers for Ascend wandsession/wanopening/ether-display data */
92 static const char ascend_xmagic[] = { 'X', 'M', 'I', 'T', '-' };
93 static const char ascend_rmagic[] = { 'R', 'E', 'C', 'V', '-' };
94 static const char ascend_w1magic[] = { 'D', 'a', 't', 'e', ':', };
95 static const char ascend_w2magic[] = { 'W', 'D', '_', 'D', 'I', 'A', 'L', 'O', 'U', 'T', '_', 'D', 'I', 'S', 'P', ':' };
97 #define ASCEND_X_SIZE (sizeof ascend_xmagic / sizeof ascend_xmagic[0])
98 #define ASCEND_R_SIZE (sizeof ascend_rmagic / sizeof ascend_rmagic[0])
99 #define ASCEND_W1_SIZE (sizeof ascend_w1magic / sizeof ascend_w1magic[0])
100 #define ASCEND_W2_SIZE (sizeof ascend_w2magic / sizeof ascend_w2magic[0])
102 static gboolean ascend_read(wtap *wth, int *err, long *data_offset);
103 static int ascend_seek_read (wtap *wth, long seek_off,
104 union wtap_pseudo_header *pseudo_header, guint8 *pd, int len);
105 static void ascend_close(wtap *wth);
107 /* Seeks to the beginning of the next packet, and returns the
108 byte offset at which the heade for that packet begins.
109 Returns -1 on failure.
111 If it finds a packet, then, if "wth->capture.ascend" is non-null,
112 it sets "wth->capture.ascend->next_packet_seek_start" to the point
113 at which the seek pointer should be set before this routine is called
114 to find the packet *after* the packet it finds. */
115 /* XXX - Handle I/O errors. */
116 static long ascend_seek(wtap *wth, int max_seek)
118 int byte, bytes_read = 0;
119 long date_off = -1, cur_off, packet_off;
120 unsigned int r_level = 0, x_level = 0, w1_level = 0, w2_level = 0;
122 while (((byte = file_getc(wth->fh)) != EOF) && bytes_read < max_seek) {
123 if (byte == ascend_xmagic[x_level]) {
125 if (x_level >= ASCEND_X_SIZE) {
126 /* At what offset are we now? */
127 cur_off = file_tell(wth->fh);
129 /* Back up over the header we just read; that's where a read
130 of this packet should start. */
131 packet_off = cur_off - ASCEND_X_SIZE;
137 if (byte == ascend_rmagic[r_level]) {
139 if (r_level >= ASCEND_R_SIZE) {
140 /* At what offset are we now? */
141 cur_off = file_tell(wth->fh);
143 /* Back up over the header we just read; that's where a read
144 of this packet should start. */
145 packet_off = cur_off - ASCEND_R_SIZE;
151 if (byte == ascend_w1magic[w1_level]) {
153 if (w1_level >= ASCEND_W1_SIZE) {
154 /* Get the offset at which the "Date:" header started. */
155 date_off = file_tell(wth->fh) - ASCEND_W1_SIZE;
160 if (byte == ascend_w2magic[w2_level]) {
162 if (w2_level >= ASCEND_W2_SIZE) {
163 /* At what offset are we now? */
164 cur_off = file_tell(wth->fh);
165 if (date_off != -1) {
166 /* This packet has a date/time header; a read of it should
167 start at the beginning of *that* header. */
168 packet_off = date_off;
170 /* This packet has only a per-packet header.
171 Back up over that header, which we just read; that's where
172 a read of this packet should start. */
173 packet_off = cur_off - ASCEND_W2_SIZE;
186 * The search for the packet after this one should start right
187 * after the header for this packet. (Ideally, it should
188 * start after the *data* for this one, but we haven't
191 if (wth->capture.ascend != NULL)
192 wth->capture.ascend->next_packet_seek_start = cur_off + 1;
195 * Move to where the read for this packet should start, and return
198 file_seek(wth->fh, packet_off, SEEK_SET);
202 /* XXX - return -1 on I/O error and actually do something with 'err'. */
203 int ascend_open(wtap *wth, int *err)
208 /* We haven't yet allocated a data structure for our private stuff;
209 set the pointer to null, so that "ascend_seek()" knows not to
211 wth->capture.ascend = NULL;
213 offset = ascend_seek(wth, ASCEND_MAX_SEEK);
218 wth->data_offset = offset;
219 wth->file_encap = WTAP_ENCAP_ASCEND;
220 wth->file_type = WTAP_FILE_ASCEND;
221 wth->snapshot_length = ASCEND_MAX_PKT_LEN;
222 wth->subtype_read = ascend_read;
223 wth->subtype_seek_read = ascend_seek_read;
224 wth->subtype_close = ascend_close;
225 wth->capture.ascend = g_malloc(sizeof(ascend_t));
227 /* The first packet we want to read is the one that "ascend_seek()"
228 just found; start searching for it at the offset at which it
230 wth->capture.ascend->next_packet_seek_start = offset;
232 /* MAXen and Pipelines report the time since reboot. In order to keep
233 from reporting packet times near the epoch, we subtract the first
234 packet's timestamp from the capture file's ctime, which gives us an
235 offset that we can apply to each packet.
237 fstat(wtap_fd(wth), &statbuf);
238 wth->capture.ascend->inittime = statbuf.st_ctime;
239 wth->capture.ascend->adjusted = 0;
246 /* Read the next packet; called from wtap_loop(). */
247 static gboolean ascend_read(wtap *wth, int *err, long *data_offset)
250 guint8 *buf = buffer_start_ptr(wth->frame_buffer);
251 ascend_pkthdr header;
253 /* (f)lex reads large chunks of the file into memory, so file_tell() doesn't
254 give us the correct location of the packet. Instead, we seek to the
255 offset after the header of the previous packet and try to find the next
257 file_seek(wth->fh, wth->capture.ascend->next_packet_seek_start, SEEK_SET);
258 offset = ascend_seek(wth, ASCEND_MAX_SEEK);
260 *err = 0; /* XXX - assume, for now, that it's an EOF */
263 if (! parse_ascend(wth->fh, buf, &wth->pseudo_header.ascend, &header, 0)) {
264 *err = WTAP_ERR_BAD_RECORD;
268 buffer_assure_space(wth->frame_buffer, wth->snapshot_length);
270 if (! wth->capture.ascend->adjusted) {
271 wth->capture.ascend->adjusted = 1;
272 if (header.start_time != 0) {
274 * Capture file contained a date and time.
275 * We do this only if this is the very first packet we've seen -
276 * i.e., if "wth->capture.ascend->adjusted" is false - because
277 * if we get a date and time after the first packet, we can't
278 * go back and adjust the time stamps of the packets we've already
279 * processed, and basing the time stamps of this and following
280 * packets on the time stamp from the file text rather than the
281 * ctime of the capture file means times before this and after
282 * this can't be compared.
284 wth->capture.ascend->inittime = header.start_time;
286 if (wth->capture.ascend->inittime > header.secs)
287 wth->capture.ascend->inittime -= header.secs;
289 wth->phdr.ts.tv_sec = header.secs + wth->capture.ascend->inittime;
290 wth->phdr.ts.tv_usec = header.usecs;
291 wth->phdr.caplen = header.caplen;
292 wth->phdr.len = header.len;
293 wth->phdr.pkt_encap = wth->file_encap;
294 wth->data_offset = offset;
296 *data_offset = offset;
300 static int ascend_seek_read (wtap *wth, long seek_off,
301 union wtap_pseudo_header *pseudo_header, guint8 *pd, int len)
303 file_seek(wth->random_fh, seek_off, SEEK_SET);
304 return parse_ascend(wth->random_fh, pd, &pseudo_header->ascend, NULL, len);
307 static void ascend_close(wtap *wth)
309 g_free(wth->capture.ascend);