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.
23 /* The code in ngsniffer.c that decodes the time fields for each packet in the
24 * Sniffer trace originally came from code from TCPVIEW:
29 * Networks and Distributed Computing
30 * Computing & Communications
31 * University of Washington
32 * Administration Building, AG-44
34 * Internet: martinh@cac.washington.edu
37 * Copyright 1992 by the University of Washington
39 * Permission to use, copy, modify, and distribute this software and its
40 * documentation for any purpose and without fee is hereby granted, provided
41 * that the above copyright notice appears in all copies and that both the
42 * above copyright notice and this permission notice appear in supporting
43 * documentation, and that the name of the University of Washington not be
44 * used in advertising or publicity pertaining to distribution of the software
45 * without specific, written prior permission. This software is made
46 * available "as is", and
47 * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
48 * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
49 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
50 * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
51 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
52 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
53 * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN CONNECTION
54 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
65 #include "file_wrappers.h"
68 #include "ngsniffer.h"
70 /* Magic number in Sniffer files. */
71 static const char ngsniffer_magic[] = {
72 'T', 'R', 'S', 'N', 'I', 'F', 'F', ' ', 'd', 'a', 't', 'a',
73 ' ', ' ', ' ', ' ', 0x1a
77 * Sniffer record types.
79 #define REC_VERS 1 /* Version record (f_vers) */
80 #define REC_FRAME2 4 /* Frame data (f_frame2) */
81 #define REC_FRAME4 8 /* Frame data (f_frame4) */
82 #define REC_FRAME6 12 /* Frame data (f_frame6) (see below) */
83 #define REC_EOF 3 /* End-of-file record (no data follows) */
85 * and now for some unknown header types
87 #define REC_HEADER1 6 /* Header containing serial numbers? */
88 #define REC_HEADER2 7 /* Header containing ??? */
89 #define REC_V2DESC 8 /* In version 2 sniffer traces contains
90 * infos about this capturing session.
91 * Collides with REC_FRAME4 */
92 #define REC_HEADER3 13 /* Retransmission counts? */
93 #define REC_HEADER4 14 /* ? */
94 #define REC_HEADER5 15 /* ? */
95 #define REC_HEADER6 16 /* More broadcast/retransmission counts? */
96 #define REC_HEADER7 17 /* ? */
100 * Sniffer version record format.
103 gint16 maj_vers; /* major version number */
104 gint16 min_vers; /* minor version number */
105 gint16 time; /* DOS-format time */
106 gint16 date; /* DOS-format date */
107 gint8 type; /* what type of records follow */
108 guint8 network; /* network type */
109 gint8 format; /* format version */
110 guint8 timeunit; /* timestamp units */
111 gint8 cmprs_vers; /* compression version */
112 gint8 cmprs_level; /* compression level */
113 gint16 rsvd[2]; /* reserved */
119 #define NETWORK_TRING 0 /* Token ring */
120 #define NETWORK_ENET 1 /* Ethernet */
121 #define NETWORK_ARCNET 2 /* ARCNET */
122 #define NETWORK_STARLAN 3 /* StarLAN */
123 #define NETWORK_PCNW 4 /* PC Network broadband (Sytek?) */
124 #define NETWORK_LOCALTALK 5 /* LocalTalk */
125 #define NETWORK_SYNCHRO 7 /* Internetwork analyzer (synchronous) */
126 #define NETWORK_ASYNC 8 /* Internetwork analyzer (asynchronous) */
127 #define NETWORK_FDDI 9 /* FDDI */
128 #define NETWORK_ATM 10 /* ATM */
131 * Sniffer type 2 data record format - followed by frame data.
133 * The Expert Sniffer Network Analyzer Operations manual, Release 5.50,
134 * documents some of the values used in "fs" and "flags". "flags" don't
135 * look as if they'd be of much interest to us, as those are internal
136 * flags for state used by the Sniffer, but "fs" gives various status
137 * bits including error indications *and*:
139 * ISDN channel information for ISDN;
141 * PPP vs. SLIP information for Async.
143 * In that section it also refers to "FDDI analyzers using the NPI PCI
144 * FDDI adapter" and "FDDI analyzers using the NPI ISA FDDI adapter",
145 * referring to the first as "F1SNIFF" and the second as "FDSNIFF";
146 * those sound as if they *could* be replacements for "TRSNIFF" in
147 * the file header, but that manual says, earlier, that the header
148 * starts with "TRSNIFF data, no matter where the frames were
151 * It also says that a type 2 record has an 8-bit "time_high"
152 * and an 8-bit "time_day" field; the code here used to have a
153 * 16-bit "time_high" value, but that gave wrong time stamps on at
154 * least some captures. Did some older manual have it as a 16-bit
155 * "tstamp_high", so that perhaps it depends on the version number
156 * in the file, or is it "tstamp_high" plus "tstamp_day" in all
157 * versions? (I forget whether this came purely from tcpview, or if
158 * I saw any of it in an NAI document.)
160 * We interpret them as unsigned, as interpreting them as signed
161 * would appear to allow time stamps that precede the start of the
162 * capture. The description of the record format shows them as
163 * "char", but the section "How the Analyzer Stores Time" shows a
164 * time stamp structure with those fields being "unsigned char".
166 * In addition, the description of the record format has the comment
167 * for the "time_day" field saying it's the time in days since the
168 * start of the capture, but the "How the Analyzer Stores Time"
169 * section says it's increased by 1 if the capture continues past
170 * midnight - and also says that the time stamp structure has a time
171 * relative to midnight when the capture started, not since the
172 * actual capture start, so that might be a difference between
173 * the internal time stamp in the Sniffer software and the time
174 * stamp in capture files (i.e., the latter might be relative to
175 * the time when the capture starts).
178 guint16 time_low; /* low part of time stamp */
179 guint16 time_med; /* middle part of time stamp */
180 guint8 time_high; /* high part of the time stamp */
181 guint8 time_day; /* time in days since start of capture */
182 gint16 size; /* number of bytes of data */
183 guint8 fs; /* frame error status bits */
184 guint8 flags; /* buffer flags */
185 gint16 true_size; /* size of original frame, in bytes */
186 gint16 rsvd; /* reserved */
192 * The bits differ for different link-layer types.
198 #define FS_ETH_CRC 0x80 /* CRC error */
199 #define FS_ETH_ALIGN 0x40 /* bad alignment */
200 #define FS_ETH_RU 0x20 /* "RU out of resources" */
201 #define FS_ETH_OVERRUN 0x10 /* DMA overrun */
202 #define FS_ETH_RUNT 0x08 /* frame too small */
203 #define FS_ETH_COLLISION 0x02 /* collision fragment */
208 #define FS_FDDI_INVALID 0x10 /* frame indicators are invalid */
209 #define FS_FDDI_ERROR 0x20 /* "frame error bit 1" */
210 #define FS_FDDI_PCI_VDL 0x01 /* VDL error on frame on PCI adapter */
211 #define FS_FDDI_PCI_CRC 0x02 /* CRC error on frame on PCI adapter */
212 #define FS_FDDI_ISA_CRC 0x20 /* CRC error on frame on ISA adapter */
215 * Internetwork analyzer (synchronous and asynchronous).
217 #define FS_WAN_DTE 0x80 /* DTE->DCE frame */
220 * Internetwork analyzer (synchronous).
222 #define FS_SYNC_LOST 0x01 /* some frames were lost */
223 #define FS_SYNC_CRC 0x02 /* CRC error */
224 #define FS_SYNC_ABORT 0x04 /* aborted frame */
225 #define FS_ISDN_CHAN_MASK 0x18 /* ISDN channel */
226 #define FS_ISDN_CHAN_D 0x18 /* ISDN channel D */
227 #define FS_ISDN_CHAN_B1 0x08 /* ISDN channel B1 */
228 #define FS_ISDN_CHAN_B2 0x10 /* ISDN channel B2 */
231 * Internetwork analyzer (asynchronous).
232 * XXX - are some of these synchronous flags? They're listed with the
233 * asynchronous flags in the Sniffer 5.50 Network Analyzer Operations
234 * manual. Is one of the "overrun" errors a synchronous overrun error?
236 #define FS_ASYNC_LOST 0x01 /* some frames were lost */
237 #define FS_ASYNC_OVERRUN 0x02 /* UART overrun, lost bytes */
238 #define FS_ASYNC_FRAMING 0x04 /* bad character (framing error?) */
239 #define FS_ASYNC_PPP 0x08 /* PPP frame */
240 #define FS_ASYNC_SLIP 0x10 /* SLIP frame */
241 #define FS_ASYNC_ALIGN 0x20 /* alignment or DLPP(?) error */
242 #define FS_ASYNC_OVERRUN2 0x40 /* overrun or bad frame length */
245 * Sniffer type 4 data record format - followed by frame data.
247 * The ATM Sniffer manual says that the "flags" field holds "buffer flags;
248 * BF_xxxx", but doesn't say what the BF_xxxx flags are. They may
249 * be the same as they are in a type 2 record, in which case they're
250 * probably not of much interest to us.
252 * XXX - the manual also says there's an 8-byte "ATMTimeStamp" driver
253 * time stamp at the end of "ATMSaveInfo", but, from an ATM Sniffer capture
254 * file I've looked at, that appears not to be the case.
258 * Fields from the AAL5 trailer for the frame, if it's an AAL5 frame
259 * rather than a cell.
261 typedef struct _ATM_AAL5Trailer {
262 guint16 aal5t_u2u; /* user-to-user indicator */
263 guint16 aal5t_len; /* length of the packet */
264 guint32 aal5t_chksum; /* checksum for AAL5 packet */
267 typedef struct _ATMTimeStamp {
268 guint32 msw; /* most significant word */
269 guint32 lsw; /* least significant word */
272 typedef struct _ATMSaveInfo {
273 guint32 StatusWord; /* status word from driver */
274 ATM_AAL5Trailer Trailer; /* AAL5 trailer */
275 guint8 AppTrafType; /* traffic type */
276 guint8 AppHLType; /* protocol type */
277 guint16 AppReserved; /* reserved */
278 guint16 Vpi; /* virtual path identifier */
279 guint16 Vci; /* virtual circuit identifier */
280 guint16 channel; /* link: 0 for DCE, 1 for DTE */
281 guint16 cells; /* number of cells */
282 guint32 AppVal1; /* type-dependent */
283 guint32 AppVal2; /* type-dependent */
287 * Bits in StatusWord.
289 #define SW_ERRMASK 0x0F /* Error mask: */
290 #define SW_RX_FIFO_UNDERRUN 0x01 /* Receive FIFO underrun */
291 #define SW_RX_FIFO_OVERRUN 0x02 /* Receive FIFO overrun */
292 #define SW_RX_PKT_TOO_LONG 0x03 /* Received packet > max size */
293 #define SW_CRC_ERROR 0x04 /* CRC error */
294 #define SW_USER_ABORTED_RX 0x05 /* User aborted receive */
295 #define SW_BUF_LEN_TOO_LONG 0x06 /* buffer len > max buf */
296 #define SW_INTERNAL_T1_ERROR 0x07 /* Internal T1 error */
297 #define SW_RX_CHANNEL_DEACTIV8 0x08 /* Rx channel deactivate */
299 #define SW_ERROR 0x80 /* Error indicator */
300 #define SW_CONGESTION 0x40 /* Congestion indicator */
301 #define SW_CLP 0x20 /* Cell loss priority indicator */
302 #define SW_RAW_CELL 0x100 /* RAW cell indicator */
303 #define SW_OAM_CELL 0x200 /* OAM cell indicator */
306 * Bits in AppTrafType.
308 * For AAL types other than AAL5, the packet data is presumably for a
309 * single cell, not a reassembled frame, as the ATM Sniffer manual says
310 * it dosn't reassemble cells other than AAL5 cells.
312 #define ATT_AALTYPE 0x0F /* AAL type: */
313 #define ATT_AAL_UNKNOWN 0x00 /* Unknown AAL */
314 #define ATT_AAL1 0x01 /* AAL1 */
315 #define ATT_AAL3_4 0x02 /* AAL3/4 */
316 #define ATT_AAL5 0x03 /* AAL5 */
317 #define ATT_AAL_USER 0x04 /* User AAL */
318 #define ATT_AAL_SIGNALLING 0x05 /* Signaling AAL */
319 #define ATT_OAMCELL 0x06 /* OAM cell */
321 #define ATT_HLTYPE 0xF0 /* Higher-layer type: */
322 #define ATT_HL_UNKNOWN 0x00 /* unknown */
323 #define ATT_HL_LLCMX 0x10 /* LLC multiplexed (probably RFC 1483) */
324 #define ATT_HL_VCMX 0x20 /* VC multiplexed (probably RFC 1483) */
325 #define ATT_HL_LANE 0x30 /* LAN Emulation */
326 #define ATT_HL_ILMI 0x40 /* ILMI */
327 #define ATT_HL_FRMR 0x50 /* Frame Relay */
328 #define ATT_HL_SPANS 0x60 /* FORE SPANS */
329 #define ATT_HL_IPSILON 0x70 /* Ipsilon */
332 * Values for AppHLType; the interpretation depends on the ATT_HLTYPE
333 * bits in AppTrafType.
335 #define AHLT_UNKNOWN 0x0
336 #define AHLT_VCMX_802_3_FCS 0x1 /* VCMX: 802.3 FCS */
337 #define AHLT_LANE_LE_CTRL 0x1 /* LANE: LE Ctrl */
338 #define AHLT_IPSILON_FT0 0x1 /* Ipsilon: Flow Type 0 */
339 #define AHLT_VCMX_802_4_FCS 0x2 /* VCMX: 802.4 FCS */
340 #define AHLT_LANE_802_3 0x2 /* LANE: 802.3 */
341 #define AHLT_IPSILON_FT1 0x2 /* Ipsilon: Flow Type 1 */
342 #define AHLT_VCMX_802_5_FCS 0x3 /* VCMX: 802.5 FCS */
343 #define AHLT_LANE_802_5 0x3 /* LANE: 802.5 */
344 #define AHLT_IPSILON_FT2 0x3 /* Ipsilon: Flow Type 2 */
345 #define AHLT_VCMX_FDDI_FCS 0x4 /* VCMX: FDDI FCS */
346 #define AHLT_LANE_802_3_MC 0x4 /* LANE: 802.3 multicast */
347 #define AHLT_VCMX_802_6_FCS 0x5 /* VCMX: 802.6 FCS */
348 #define AHLT_LANE_802_5_MC 0x5 /* LANE: 802.5 multicast */
349 #define AHLT_VCMX_802_3 0x7 /* VCMX: 802.3 */
350 #define AHLT_VCMX_802_4 0x8 /* VCMX: 802.4 */
351 #define AHLT_VCMX_802_5 0x9 /* VCMX: 802.5 */
352 #define AHLT_VCMX_FDDI 0xa /* VCMX: FDDI */
353 #define AHLT_VCMX_802_6 0xb /* VCMX: 802.6 */
354 #define AHLT_VCMX_FRAGMENTS 0xc /* VCMX: Fragments */
355 #define AHLT_VCMX_BPDU 0xe /* VCMX: BPDU */
358 guint16 time_low; /* low part of time stamp */
359 guint16 time_med; /* middle part of time stamp */
360 guint8 time_high; /* high part of time stamp */
361 guint8 time_day; /* time in days since start of capture */
362 gint16 size; /* number of bytes of data */
363 gint8 fs; /* frame error status bits */
364 gint8 flags; /* buffer flags */
365 gint16 true_size; /* size of original frame, in bytes */
366 gint16 rsvd3; /* reserved */
367 gint16 atm_pad; /* pad to 4-byte boundary */
368 ATMSaveInfo atm_info; /* ATM-specific stuff */
372 * XXX - I have a version 5.50 file with a bunch of token ring
373 * records listed as type "12". The record format below was
374 * derived from frame4_rec and a bit of experimentation.
378 guint16 time_low; /* low part of time stamp */
379 guint16 time_med; /* middle part of time stamp */
380 guint8 time_high; /* high part of time stamp */
381 guint8 time_day; /* time in days since start of capture */
382 gint16 size; /* number of bytes of data */
383 guint8 fs; /* frame error status bits */
384 guint8 flags; /* buffer flags */
385 gint16 true_size; /* size of original frame, in bytes */
386 guint8 chemical_x[22]; /* ? */
390 * Network type values in some type 7 records.
392 * Captures with a major version number of 2 appear to have type 7
393 * records with text in them (at least one I have does).
395 * Captures with a major version of 4, and at least some captures with
396 * a major version of 5, have type 7 records with those values in the
399 * However, some captures with a major version number of 5 appear not to
400 * have type 7 records at all (at least one I have doesn't), but do appear
401 * to put non-zero values in the "rsvd" field of the version header (at
402 * least one I have does) - at least some other captures with smaller version
403 * numbers appear to put 0 there, so *maybe* that's where the network
404 * (sub)type is hidden in those captures. The version 5 captures I've seen
405 * that *do* have type 7 records put 0 there, so it's not as if *all* V5
406 * captures have something in the "rsvd" field, however.
408 * The semantics of these network types is inferred from the Sniffer
409 * documentation, as they correspond to types described in the UI;
412 * http://www.mcafee.com/common/media/sniffer/support/sdos/operation.pdf
414 * starting at page 3-10 (56 of 496).
416 * XXX - I've seen X.25 captures with NET_ROUTER, and I've seen bridge/
417 * router captures with NET_HDLC. Sigh.... Are those just captures for
418 * which the user set the wrong network type when capturing?
420 #define NET_SDLC 0 /* Probably "SDLC then SNA" */
421 #define NET_HDLC 1 /* Used for X.25; is it used for other
422 things as well, or is it "HDLC then
423 X.25", as referred to by the document
424 cited above, and only used for X.25? */
425 #define NET_FRAME_RELAY 2
426 #define NET_ROUTER 3 /* Probably "Router/Bridge", for various
427 point-to-point protocols for use between
428 bridges and routers, including PPP as well
429 as various proprietary protocols; also
430 used for ISDN, for reasons not obvious
431 to me, given that a Sniffer knows
432 whether it's using a WAN or an ISDN pod */
433 #define NET_PPP 4 /* "Asynchronous", which includes SLIP too */
434 #define NET_SMDS 5 /* Not mentioned in the document, but
435 that's a document for version 5.50 of
436 the Sniffer, and that version might use
437 version 5 in the file format and thus
438 might not be using type 7 records */
441 * Values for V.timeunit, in picoseconds, so that they can be represented
442 * as integers. These values must be < 2^(64-40); see below.
444 * XXX - at least some captures with a V.timeunit value of 2 show
445 * packets with time stamps in 2011 if the time stamp is interpreted
446 * to be in units of 15 microseconds. The capture predates 2008,
447 * so that interpretation is probably wrong. Perhaps the interpretation
448 * of V.timeunit depends on the version number of the file?
450 static const guint32 Psec[] = {
451 15000000, /* 15.0 usecs = 15000000 psecs */
452 838096, /* .838096 usecs = 838096 psecs */
453 15000000, /* 15.0 usecs = 15000000 psecs */
454 500000, /* 0.5 usecs = 500000 psecs */
455 2000000, /* 2.0 usecs = 2000000 psecs */
456 1000000, /* 1.0 usecs = 1000000 psecs */
457 /* XXX - Sniffer doc says 0.08 usecs = 80000 psecs */
458 100000 /* 0.1 usecs = 100000 psecs */
460 #define NUM_NGSNIFF_TIMEUNITS (sizeof Psec / sizeof Psec[0])
462 static int process_header_records(wtap *wth, int *err, gchar **err_info,
463 gint16 maj_vers, guint8 network);
464 static int process_rec_header2_v2(wtap *wth, unsigned char *buffer,
465 guint16 length, int *err, gchar **err_info);
466 static int process_rec_header2_v145(wtap *wth, unsigned char *buffer,
467 guint16 length, gint16 maj_vers, int *err, gchar **err_info);
468 static gboolean ngsniffer_read(wtap *wth, int *err, gchar **err_info,
469 gint64 *data_offset);
470 static gboolean ngsniffer_seek_read(wtap *wth, gint64 seek_off,
471 union wtap_pseudo_header *pseudo_header, guchar *pd, int packet_size,
472 int *err, gchar **err_info);
473 static int ngsniffer_read_rec_header(wtap *wth, gboolean is_random,
474 guint16 *typep, guint16 *lengthp, int *err);
475 static gboolean ngsniffer_read_frame2(wtap *wth, gboolean is_random,
476 struct frame2_rec *frame2, int *err);
477 static void set_pseudo_header_frame2(wtap *wth,
478 union wtap_pseudo_header *pseudo_header, struct frame2_rec *frame2);
479 static gboolean ngsniffer_read_frame4(wtap *wth, gboolean is_random,
480 struct frame4_rec *frame4, int *err);
481 static void set_pseudo_header_frame4(union wtap_pseudo_header *pseudo_header,
482 struct frame4_rec *frame4);
483 static gboolean ngsniffer_read_frame6(wtap *wth, gboolean is_random,
484 struct frame6_rec *frame6, int *err);
485 static void set_pseudo_header_frame6(wtap *wth,
486 union wtap_pseudo_header *pseudo_header, struct frame6_rec *frame6);
487 static gboolean ngsniffer_read_rec_data(wtap *wth, gboolean is_random,
488 guchar *pd, size_t length, int *err);
489 static int infer_pkt_encap(const guint8 *pd, int len);
490 static int fix_pseudo_header(int encap, const guint8 *pd, int len,
491 union wtap_pseudo_header *pseudo_header);
492 static void ngsniffer_sequential_close(wtap *wth);
493 static void ngsniffer_close(wtap *wth);
494 static gboolean ngsniffer_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
495 const union wtap_pseudo_header *pseudo_header, const guchar *pd, int *err);
496 static gboolean ngsniffer_dump_close(wtap_dumper *wdh, int *err);
497 static int SnifferDecompress( unsigned char * inbuf, size_t inlen,
498 unsigned char * outbuf, size_t outlen, int *err );
499 static gint64 ng_file_read(void *buffer, size_t elementsize, size_t numelements,
500 wtap *wth, gboolean is_random, int *err);
501 static int read_blob(FILE_T infile, ngsniffer_comp_stream_t *comp_stream,
503 static gint64 ng_file_seek_seq(wtap *wth, gint64 offset, int whence, int *err);
504 static gint64 ng_file_seek_rand(wtap *wth, gint64 offset, int whence, int *err);
506 int ngsniffer_open(wtap *wth, int *err, gchar **err_info)
509 char magic[sizeof ngsniffer_magic];
511 char record_length[4]; /* only the first 2 bytes are length,
512 the last 2 are "reserved" and are thrown away */
513 guint16 type, length;
514 struct vers_rec version;
518 static const int sniffer_encap[] = {
519 WTAP_ENCAP_TOKEN_RING,
522 WTAP_ENCAP_UNKNOWN, /* StarLAN */
523 WTAP_ENCAP_UNKNOWN, /* PC Network broadband */
524 WTAP_ENCAP_UNKNOWN, /* LocalTalk */
525 WTAP_ENCAP_UNKNOWN, /* Znet */
526 WTAP_ENCAP_PER_PACKET, /* Internetwork analyzer (synchronous) */
527 WTAP_ENCAP_PER_PACKET, /* Internetwork analyzer (asynchronous) */
528 WTAP_ENCAP_FDDI_BITSWAPPED,
531 #define NUM_NGSNIFF_ENCAPS (sizeof sniffer_encap / sizeof sniffer_encap[0])
534 /* Read in the string that should be at the start of a Sniffer file */
535 errno = WTAP_ERR_CANT_READ;
536 bytes_read = file_read(magic, 1, sizeof magic, wth->fh);
537 if (bytes_read != sizeof magic) {
538 *err = file_error(wth->fh);
543 wth->data_offset += sizeof magic;
545 if (memcmp(magic, ngsniffer_magic, sizeof ngsniffer_magic)) {
550 * Read the first record, which the manual says is a version
553 errno = WTAP_ERR_CANT_READ;
554 bytes_read = file_read(record_type, 1, 2, wth->fh);
555 bytes_read += file_read(record_length, 1, 4, wth->fh);
556 if (bytes_read != 6) {
557 *err = file_error(wth->fh);
562 wth->data_offset += 6;
564 type = pletohs(record_type);
565 length = pletohs(record_length);
567 if (type != REC_VERS) {
568 *err = WTAP_ERR_BAD_RECORD;
569 *err_info = g_strdup_printf("ngsniffer: Sniffer file doesn't start with a version record");
573 errno = WTAP_ERR_CANT_READ;
574 bytes_read = file_read(&version, 1, sizeof version, wth->fh);
575 if (bytes_read != sizeof version) {
576 *err = file_error(wth->fh);
581 wth->data_offset += sizeof version;
583 /* Check the data link type. */
584 if (version.network >= NUM_NGSNIFF_ENCAPS
585 || sniffer_encap[version.network] == WTAP_ENCAP_UNKNOWN) {
586 *err = WTAP_ERR_UNSUPPORTED_ENCAP;
587 *err_info = g_strdup_printf("ngsniffer: network type %u unknown or unsupported",
592 /* Check the time unit */
593 if (version.timeunit >= NUM_NGSNIFF_TIMEUNITS) {
594 *err = WTAP_ERR_UNSUPPORTED;
595 *err_info = g_strdup_printf("ngsniffer: Unknown timeunit %u", version.timeunit);
599 /* compressed or uncompressed Sniffer file? */
600 if (version.format != 1) {
601 wth->file_type = WTAP_FILE_NGSNIFFER_COMPRESSED;
604 wth->file_type = WTAP_FILE_NGSNIFFER_UNCOMPRESSED;
607 /* Set encap type before reading header records because the
608 * header record may change encap type.
610 wth->file_encap = sniffer_encap[version.network];
613 * We don't know how to handle the remaining header record types,
614 * so we just skip them - except for REC_HEADER2 records, which
615 * we look at, for "Internetwork analyzer" captures, to attempt to
616 * determine what the link-layer encapsulation is.
618 * XXX - in some version 1.16 internetwork analyzer files
619 * generated by the Windows Sniffer when saving Windows
620 * Sniffer files as DOS Sniffer files, there's no REC_HEADER2
621 * record, but the first "rsvd" word is 1 for PRI ISDN files, 2
622 * for BRI ISDN files, and 0 for non-ISDN files; is that something
623 * the DOS Sniffer understands?
625 maj_vers = pletohs(&version.maj_vers);
626 if (process_header_records(wth, err, err_info, maj_vers,
627 version.network) < 0)
629 if ((version.network == NETWORK_SYNCHRO ||
630 version.network == NETWORK_ASYNC) &&
631 wth->file_encap == WTAP_ENCAP_PER_PACKET) {
633 * Well, we haven't determined the internetwork analyzer
640 * ... and this is a version 1 capture; look
641 * at the first "rsvd" word.
643 switch (pletohs(&version.rsvd[0])) {
647 wth->file_encap = WTAP_ENCAP_ISDN;
654 * ...and this is a version 3 capture; we've
655 * seen nothing in those that obviously
656 * indicates the capture type, but the only
657 * one we've seen is a Frame Relay capture,
658 * so mark it as Frame Relay for now.
660 wth->file_encap = WTAP_ENCAP_FRELAY_WITH_PHDR;
666 * Now, if we have a random stream open, position it to the same
667 * location, which should be the beginning of the real data, and
668 * should be the beginning of the compressed data.
670 * XXX - will we see any records other than REC_FRAME2, REC_FRAME4,
671 * or REC_EOF after this? If not, we can get rid of the loop in
672 * "ngsniffer_read()".
674 if (wth->random_fh != NULL) {
675 if (file_seek(wth->random_fh, wth->data_offset, SEEK_SET, err) == -1)
679 /* This is a ngsniffer file */
680 wth->capture.ngsniffer = g_malloc(sizeof(ngsniffer_t));
681 wth->capture.ngsniffer->maj_vers = maj_vers;
682 wth->capture.ngsniffer->min_vers = pletohs(&version.min_vers);
684 /* We haven't allocated any uncompression buffers yet. */
685 wth->capture.ngsniffer->seq.buf = NULL;
686 wth->capture.ngsniffer->rand.buf = NULL;
688 /* Set the current file offset; the offset in the compressed file
689 and in the uncompressed data stream currently the same. */
690 wth->capture.ngsniffer->seq.uncomp_offset = wth->data_offset;
691 wth->capture.ngsniffer->seq.comp_offset = wth->data_offset;
692 wth->capture.ngsniffer->rand.uncomp_offset = wth->data_offset;
693 wth->capture.ngsniffer->rand.comp_offset = wth->data_offset;
695 /* We don't yet have any list of compressed blobs. */
696 wth->capture.ngsniffer->first_blob = NULL;
697 wth->capture.ngsniffer->last_blob = NULL;
698 wth->capture.ngsniffer->current_blob = NULL;
700 wth->subtype_read = ngsniffer_read;
701 wth->subtype_seek_read = ngsniffer_seek_read;
702 wth->subtype_sequential_close = ngsniffer_sequential_close;
703 wth->subtype_close = ngsniffer_close;
704 wth->snapshot_length = 0; /* not available in header, only in frame */
705 wth->capture.ngsniffer->timeunit = Psec[version.timeunit];
706 wth->capture.ngsniffer->network = version.network;
708 /* Get capture start time */
709 start_time = pletohs(&version.time);
710 start_date = pletohs(&version.date);
711 tm.tm_year = ((start_date&0xfe00)>>9) + 1980 - 1900;
712 tm.tm_mon = ((start_date&0x1e0)>>5) - 1;
713 tm.tm_mday = (start_date&0x1f);
714 /* The time does not appear to act as an offset; only the date
715 tm.tm_hour = (start_time&0xf800)>>11;
716 tm.tm_min = (start_time&0x7e0)>>5;
717 tm.tm_sec = (start_time&0x1f)<<1;*/
722 wth->capture.ngsniffer->start = mktime(&tm);
724 * XXX - what if "secs" is -1? Unlikely,
725 * but if the capture was done in a time
726 * zone that switches between standard and
727 * summer time sometime other than when we
728 * do, and thus the time was one that doesn't
729 * exist here because a switch from standard
730 * to summer time zips over it, it could
733 * On the other hand, if the capture was done
734 * in a different time zone, this won't work
735 * right anyway; unfortunately, the time zone
736 * isn't stored in the capture file.
739 wth->tsprecision = WTAP_FILE_TSPREC_NSEC; /* XXX */
745 process_header_records(wtap *wth, int *err, gchar **err_info, gint16 maj_vers,
750 char record_length[4]; /* only the first 2 bytes are length,
751 the last 2 are "reserved" and are thrown away */
752 guint16 type, length;
754 unsigned char buffer[256];
757 errno = WTAP_ERR_CANT_READ;
758 bytes_read = file_read(record_type, 1, 2, wth->fh);
759 if (bytes_read != 2) {
760 *err = file_error(wth->fh);
763 if (bytes_read != 0) {
764 *err = WTAP_ERR_SHORT_READ;
770 type = pletohs(record_type);
771 if ((type != REC_HEADER1) && (type != REC_HEADER2)
772 && (type != REC_HEADER3) && (type != REC_HEADER4)
773 && (type != REC_HEADER5) && (type != REC_HEADER6)
774 && (type != REC_HEADER7)
775 && ((type != REC_V2DESC) || (maj_vers > 2)) ) {
777 * Well, this is either some unknown header type
778 * (we ignore this case), an uncompressed data
779 * frame or the length of a compressed blob
780 * which implies data. Seek backwards over the
781 * two bytes we read, and return.
783 if (file_seek(wth->fh, -2, SEEK_CUR, err) == -1)
788 errno = WTAP_ERR_CANT_READ;
789 bytes_read = file_read(record_length, 1, 4, wth->fh);
790 if (bytes_read != 4) {
791 *err = file_error(wth->fh);
793 *err = WTAP_ERR_SHORT_READ;
796 wth->data_offset += 6;
798 length = pletohs(record_length);
801 * Is this is an "Internetwork analyzer" capture, and
802 * is this a REC_HEADER2 record?
804 * If so, it appears to specify the particular type
805 * of network we're on.
807 * XXX - handle sync and async differently? (E.g.,
808 * does this apply only to sync?)
810 if ((network == NETWORK_SYNCHRO || network == NETWORK_ASYNC) &&
811 type == REC_HEADER2) {
813 * Yes, get the first up-to-256 bytes of the
816 bytes_to_read = MIN(length, (int)sizeof buffer);
817 bytes_read = file_read(buffer, 1, bytes_to_read,
819 if (bytes_read != bytes_to_read) {
820 *err = file_error(wth->fh);
822 *err = WTAP_ERR_SHORT_READ;
830 if (process_rec_header2_v2(wth, buffer,
831 length, err, err_info) < 0)
838 if (process_rec_header2_v145(wth, buffer,
839 length, maj_vers, err, err_info) < 0)
845 * Skip the rest of the record.
847 if (length > sizeof buffer) {
848 if (file_seek(wth->fh, length - sizeof buffer,
849 SEEK_CUR, err) == -1)
853 /* Nope, just skip over the data. */
854 if (file_seek(wth->fh, length, SEEK_CUR, err) == -1)
857 wth->data_offset += length;
862 process_rec_header2_v2(wtap *wth, unsigned char *buffer, guint16 length,
863 int *err, gchar **err_info)
865 static const char x_25_str[] = "HDLC\nX.25\n";
868 * There appears to be a string in a REC_HEADER2 record, with
869 * a list of protocols. In one X.25 capture I've seen, the
870 * string was "HDLC\nX.25\nCLNP\nISO_TP\nSESS\nPRES\nVTP\nACSE".
871 * Presumably CLNP and everything else is per-packet, but
872 * we assume "HDLC\nX.25\n" indicates that it's an X.25 capture.
874 if (length < sizeof x_25_str - 1) {
876 * There's not enough data to compare.
878 *err = WTAP_ERR_UNSUPPORTED_ENCAP;
879 *err_info = g_strdup_printf("ngsniffer: WAN capture has too-short protocol list");
883 if (strncmp((char *)buffer, x_25_str, sizeof x_25_str - 1) == 0) {
887 wth->file_encap = WTAP_ENCAP_LAPB;
889 *err = WTAP_ERR_UNSUPPORTED_ENCAP;
890 *err_info = g_strdup_printf("ngsniffer: WAN capture protocol string %.*s unknown",
898 process_rec_header2_v145(wtap *wth, unsigned char *buffer, guint16 length,
899 gint16 maj_vers, int *err, gchar **err_info)
902 * The 5th byte of the REC_HEADER2 record appears to be a
907 * There is no 5th byte; give up.
909 *err = WTAP_ERR_UNSUPPORTED_ENCAP;
910 *err_info = g_strdup("ngsniffer: WAN capture has no network subtype");
915 * The X.25 captures I've seen have a type of NET_HDLC, and the
916 * Sniffer documentation seems to imply that it's used for
917 * X.25, although it could be used for other purposes as well.
919 * NET_ROUTER is used for all sorts of point-to-point protocols,
920 * including ISDN. It appears, from the documentation, that the
921 * Sniffer attempts to infer the particular protocol by looking
922 * at the traffic; it's not clear whether it stores in the file
923 * an indication of the protocol it inferred was being used.
925 * Unfortunately, it also appears that NET_HDLC is used for
926 * stuff other than X.25 as well, so we can't just interpret
927 * it unconditionally as X.25.
929 * For now, we interpret both NET_HDLC and NET_ROUTER as "per-packet
930 * encapsulation". We remember that we saw NET_ROUTER, though,
931 * as it appears that we can infer whether a packet is PPP or
932 * ISDN based on the channel number subfield of the frame error
933 * status bits - if it's 0, it's PPP, otherwise it's ISDN and
934 * the channel number indicates which channel it is. We assume
935 * NET_HDLC isn't used for ISDN.
940 wth->file_encap = WTAP_ENCAP_SDLC;
944 wth->file_encap = WTAP_ENCAP_PER_PACKET;
947 case NET_FRAME_RELAY:
948 wth->file_encap = WTAP_ENCAP_FRELAY_WITH_PHDR;
953 * For most of the version 4 capture files I've seen,
954 * 0xfa in buffer[1] means the file is an ISDN capture,
955 * but there's one PPP file with 0xfa there; does that
956 * mean that the 0xfa has nothing to do with ISDN,
957 * or is that just an ISDN file with no D channel
958 * packets? (The channel number is not 0 in any
959 * of the packets, so perhaps it is.)
961 * For one version 5 ISDN capture I've seen, there's
962 * a 0x01 in buffer[6]; none of the non-ISDN version
963 * 5 captures have it.
965 wth->file_encap = WTAP_ENCAP_PER_PACKET;
969 if (buffer[1] == 0xfa)
970 wth->file_encap = WTAP_ENCAP_ISDN;
976 * There is no 5th byte; give up.
978 *err = WTAP_ERR_UNSUPPORTED_ENCAP;
979 *err_info = g_strdup("ngsniffer: WAN bridge/router capture has no ISDN flag");
982 if (buffer[6] == 0x01)
983 wth->file_encap = WTAP_ENCAP_ISDN;
989 wth->file_encap = WTAP_ENCAP_PPP_WITH_PHDR;
994 * Reject these until we can figure them out.
996 *err = WTAP_ERR_UNSUPPORTED_ENCAP;
997 *err_info = g_strdup_printf("ngsniffer: WAN network subtype %u unknown or unsupported",
1004 /* Read the next packet */
1005 static gboolean ngsniffer_read(wtap *wth, int *err, gchar **err_info,
1006 gint64 *data_offset)
1009 guint16 type, length;
1010 struct frame2_rec frame2;
1011 struct frame4_rec frame4;
1012 struct frame6_rec frame6;
1013 guint16 time_low, time_med, true_size, size;
1014 guint8 time_high, time_day;
1015 guint64 t, tsecs, tpsecs;
1020 * Read the record header.
1022 *data_offset = wth->data_offset;
1023 ret = ngsniffer_read_rec_header(wth, FALSE, &type, &length,
1026 /* Read error or EOF */
1029 wth->data_offset += 6;
1034 if (wth->capture.ngsniffer->network == NETWORK_ATM) {
1036 * We shouldn't get a frame2 record in
1039 *err = WTAP_ERR_BAD_RECORD;
1040 *err_info = g_strdup("ngsniffer: REC_FRAME2 record in an ATM Sniffer file");
1044 /* Read the f_frame2_struct */
1045 if (!ngsniffer_read_frame2(wth, FALSE, &frame2, err)) {
1049 wth->data_offset += sizeof frame2;
1050 time_low = pletohs(&frame2.time_low);
1051 time_med = pletohs(&frame2.time_med);
1052 time_high = frame2.time_high;
1053 time_day = frame2.time_day;
1054 size = pletohs(&frame2.size);
1055 true_size = pletohs(&frame2.true_size);
1057 length -= sizeof frame2; /* we already read that much */
1059 set_pseudo_header_frame2(wth, &wth->pseudo_header,
1064 if (wth->capture.ngsniffer->network != NETWORK_ATM) {
1066 * We shouldn't get a frame2 record in
1067 * a non-ATM capture.
1069 *err = WTAP_ERR_BAD_RECORD;
1070 *err_info = g_strdup("ngsniffer: REC_FRAME4 record in a non-ATM Sniffer file");
1074 /* Read the f_frame4_struct */
1075 if (!ngsniffer_read_frame4(wth, FALSE, &frame4, err)) {
1079 wth->data_offset += sizeof frame4;
1080 time_low = pletohs(&frame4.time_low);
1081 time_med = pletohs(&frame4.time_med);
1082 time_high = frame4.time_high;
1083 time_day = frame4.time_day;
1084 size = pletohs(&frame4.size);
1085 true_size = pletohs(&frame4.true_size);
1088 * XXX - it looks as if some version 4 captures have
1089 * a bogus record length, based on the assumption
1090 * that the record is a frame2 record.
1092 if (wth->capture.ngsniffer->maj_vers >= 5)
1093 length -= sizeof frame4; /* we already read that much */
1095 if (wth->capture.ngsniffer->min_vers >= 95)
1096 length -= sizeof frame2;
1098 length -= sizeof frame4;
1101 set_pseudo_header_frame4(&wth->pseudo_header, &frame4);
1105 /* Read the f_frame6_struct */
1106 if (!ngsniffer_read_frame6(wth, FALSE, &frame6, err)) {
1110 wth->data_offset += sizeof frame6;
1111 time_low = pletohs(&frame6.time_low);
1112 time_med = pletohs(&frame6.time_med);
1113 time_high = frame6.time_high;
1114 time_day = frame6.time_day;
1115 size = pletohs(&frame6.size);
1116 true_size = pletohs(&frame6.true_size);
1118 length -= sizeof frame6; /* we already read that much */
1120 set_pseudo_header_frame6(wth, &wth->pseudo_header,
1126 * End of file. Return an EOF indication.
1128 *err = 0; /* EOF, not error */
1132 break; /* unknown type, skip it */
1136 * Well, we don't know what it is, or we know what
1137 * it is but can't handle it. Skip past the data
1138 * portion, and keep looping.
1140 if (ng_file_seek_seq(wth, length, SEEK_CUR, err) == -1)
1142 wth->data_offset += length;
1147 * OK, is the frame data size greater than than what's left of the
1150 if (size > length) {
1152 * Yes - treat this as an error.
1154 *err = WTAP_ERR_BAD_RECORD;
1155 *err_info = g_strdup("ngsniffer: Record length is less than packet size");
1159 wth->phdr.len = true_size ? true_size : size;
1160 wth->phdr.caplen = size;
1163 * Read the packet data.
1165 buffer_assure_space(wth->frame_buffer, length);
1166 pd = buffer_start_ptr(wth->frame_buffer);
1167 if (!ngsniffer_read_rec_data(wth, FALSE, pd, length, err))
1168 return FALSE; /* Read error */
1169 wth->data_offset += length;
1171 wth->phdr.pkt_encap = fix_pseudo_header(wth->file_encap, pd, length,
1172 &wth->pseudo_header);
1175 * 40-bit time stamp, in units of timeunit picoseconds.
1177 t = (((guint64)time_high)<<32) | (((guint32)time_med) << 16) | time_low;
1180 * timeunit is always < 2^(64-40), so t * timeunit fits in 64
1181 * bits. That gives a 64-bit time stamp, in units of
1184 t *= wth->capture.ngsniffer->timeunit;
1187 * Convert to seconds and picoseconds.
1189 tsecs = t/G_GINT64_CONSTANT(1000000000000U);
1190 tpsecs = t - tsecs*G_GINT64_CONSTANT(1000000000000U);
1193 * Add in the time_day value (86400 seconds/day).
1195 tsecs += time_day*86400;
1198 * Add in the capture start time.
1200 tsecs += wth->capture.ngsniffer->start;
1202 wth->phdr.ts.secs = (time_t)tsecs;
1203 wth->phdr.ts.nsecs = (int)(tpsecs/1000); /* psecs to nsecs */
1207 static gboolean ngsniffer_seek_read(wtap *wth, gint64 seek_off,
1208 union wtap_pseudo_header *pseudo_header, guchar *pd, int packet_size,
1209 int *err, gchar **err_info _U_)
1212 guint16 type, length;
1213 struct frame2_rec frame2;
1214 struct frame4_rec frame4;
1215 struct frame6_rec frame6;
1217 if (ng_file_seek_rand(wth, seek_off, SEEK_SET, err) == -1)
1220 ret = ngsniffer_read_rec_header(wth, TRUE, &type, &length, err);
1222 /* Read error or EOF */
1224 /* EOF means "short read" in random-access mode */
1225 *err = WTAP_ERR_SHORT_READ;
1233 /* Read the f_frame2_struct */
1234 if (!ngsniffer_read_frame2(wth, TRUE, &frame2, err)) {
1239 length -= sizeof frame2; /* we already read that much */
1241 set_pseudo_header_frame2(wth, pseudo_header, &frame2);
1245 /* Read the f_frame4_struct */
1246 if (!ngsniffer_read_frame4(wth, TRUE, &frame4, err)) {
1251 length -= sizeof frame4; /* we already read that much */
1253 set_pseudo_header_frame4(pseudo_header, &frame4);
1257 /* Read the f_frame6_struct */
1258 if (!ngsniffer_read_frame6(wth, TRUE, &frame6, err)) {
1263 length -= sizeof frame6; /* we already read that much */
1265 set_pseudo_header_frame6(wth, pseudo_header, &frame6);
1272 g_assert_not_reached();
1277 * Got the pseudo-header (if any), now get the data.
1279 if (!ngsniffer_read_rec_data(wth, TRUE, pd, packet_size, err))
1282 fix_pseudo_header(wth->file_encap, pd, packet_size, pseudo_header);
1287 static int ngsniffer_read_rec_header(wtap *wth, gboolean is_random,
1288 guint16 *typep, guint16 *lengthp, int *err)
1291 char record_type[2];
1292 char record_length[4]; /* only 1st 2 bytes are length */
1295 * Read the record header.
1297 bytes_read = ng_file_read(record_type, 1, 2, wth, is_random, err);
1298 if (bytes_read != 2) {
1301 if (bytes_read != 0) {
1302 *err = WTAP_ERR_SHORT_READ;
1307 bytes_read = ng_file_read(record_length, 1, 4, wth, is_random, err);
1308 if (bytes_read != 4) {
1310 *err = WTAP_ERR_SHORT_READ;
1314 *typep = pletohs(record_type);
1315 *lengthp = pletohs(record_length);
1316 return 1; /* success */
1319 static gboolean ngsniffer_read_frame2(wtap *wth, gboolean is_random,
1320 struct frame2_rec *frame2, int *err)
1324 /* Read the f_frame2_struct */
1325 bytes_read = ng_file_read(frame2, 1, sizeof *frame2, wth, is_random,
1327 if (bytes_read != sizeof *frame2) {
1329 *err = WTAP_ERR_SHORT_READ;
1335 static void set_pseudo_header_frame2(wtap *wth,
1336 union wtap_pseudo_header *pseudo_header, struct frame2_rec *frame2)
1339 * In one PPP "Internetwork analyzer" capture:
1341 * The only bit seen in "frame2.fs" is the 0x80 bit, which
1342 * probably indicates the packet's direction; all other
1343 * bits were zero. The Expert Sniffer Network Analyzer
1344 * 5.50 Operations manual says that bit is the FS_DTE bit
1345 * for async/PPP data. The other bits are error bits
1346 * plus bits indicating whether the frame is PPP or SLIP,
1347 * but the PPP bit isn't set.
1349 * All bits in "frame2.flags" were zero.
1351 * In one X.25 "Internetwork analyzer" capture:
1353 * The only bit seen in "frame2.fs" is the 0x80 bit, which
1354 * probably indicates the packet's direction; all other
1357 * "frame2.flags" was always 0x18; however, the Sniffer
1358 * manual says that just means that a display filter was
1359 * calculated for the frame, and it should be displayed,
1360 * so perhaps that's just a quirk of that particular capture.
1362 * In one Ethernet capture:
1364 * "frame2.fs" was always 0; the Sniffer manual says they're
1365 * error bits of various sorts.
1367 * "frame2.flags" was either 0 or 0x18, with no obvious
1368 * correlation with anything. See previous comment
1369 * about display filters.
1371 * In one Token Ring capture:
1373 * "frame2.fs" was either 0 or 0xcc; the Sniffer manual says
1374 * nothing about those bits for Token Ring captures.
1376 * "frame2.flags" was either 0 or 0x18, with no obvious
1377 * correlation with anything. See previous comment
1378 * about display filters.
1380 switch (wth->file_encap) {
1382 case WTAP_ENCAP_ETHERNET:
1384 * XXX - do we ever have an FCS? If not, why do we often
1385 * have 4 extra bytes of stuff at the end? Do some
1386 * PC Ethernet interfaces report the length including the
1387 * FCS but not store the FCS in the packet, or do some
1388 * Ethernet drivers work that way?
1390 pseudo_header->eth.fcs_len = 0;
1393 case WTAP_ENCAP_PPP_WITH_PHDR:
1394 case WTAP_ENCAP_SDLC:
1395 pseudo_header->p2p.sent = (frame2->fs & FS_WAN_DTE) ? TRUE : FALSE;
1398 case WTAP_ENCAP_LAPB:
1399 case WTAP_ENCAP_FRELAY_WITH_PHDR:
1400 case WTAP_ENCAP_PER_PACKET:
1401 pseudo_header->x25.flags = (frame2->fs & FS_WAN_DTE) ? 0x00 : FROM_DCE;
1404 case WTAP_ENCAP_ISDN:
1405 pseudo_header->isdn.uton = (frame2->fs & FS_WAN_DTE) ? FALSE : TRUE;
1406 switch (frame2->fs & FS_ISDN_CHAN_MASK) {
1408 case FS_ISDN_CHAN_D:
1409 pseudo_header->isdn.channel = 0; /* D-channel */
1412 case FS_ISDN_CHAN_B1:
1413 pseudo_header->isdn.channel = 1; /* B1-channel */
1416 case FS_ISDN_CHAN_B2:
1417 pseudo_header->isdn.channel = 2; /* B2-channel */
1421 pseudo_header->isdn.channel = 30; /* XXX */
1427 static gboolean ngsniffer_read_frame4(wtap *wth, gboolean is_random,
1428 struct frame4_rec *frame4, int *err)
1432 /* Read the f_frame4_struct */
1433 bytes_read = ng_file_read(frame4, 1, sizeof *frame4, wth, is_random,
1435 if (bytes_read != sizeof *frame4) {
1437 *err = WTAP_ERR_SHORT_READ;
1443 static void set_pseudo_header_frame4(union wtap_pseudo_header *pseudo_header,
1444 struct frame4_rec *frame4)
1447 guint8 aal_type, hl_type;
1451 * Map flags from frame4.atm_info.StatusWord.
1453 pseudo_header->atm.flags = 0;
1454 StatusWord = pletohl(&frame4->atm_info.StatusWord);
1455 if (StatusWord & SW_RAW_CELL)
1456 pseudo_header->atm.flags |= ATM_RAW_CELL;
1458 aal_type = frame4->atm_info.AppTrafType & ATT_AALTYPE;
1459 hl_type = frame4->atm_info.AppTrafType & ATT_HLTYPE;
1460 vpi = pletohs(&frame4->atm_info.Vpi);
1461 vci = pletohs(&frame4->atm_info.Vci);
1465 case ATT_AAL_UNKNOWN:
1467 * Map ATT_AAL_UNKNOWN on VPI 0, VCI 5 to ATT_AAL_SIGNALLING,
1468 * as that's the VPCI used for signalling.
1470 * XXX - is this necessary, or will frames to 0/5 always
1471 * have ATT_AAL_SIGNALLING?
1473 if (vpi == 0 && vci == 5)
1474 pseudo_header->atm.aal = AAL_SIGNALLING;
1476 pseudo_header->atm.aal = AAL_UNKNOWN;
1477 pseudo_header->atm.type = TRAF_UNKNOWN;
1478 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1482 pseudo_header->atm.aal = AAL_1;
1483 pseudo_header->atm.type = TRAF_UNKNOWN;
1484 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1488 pseudo_header->atm.aal = AAL_3_4;
1489 pseudo_header->atm.type = TRAF_UNKNOWN;
1490 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1494 pseudo_header->atm.aal = AAL_5;
1497 case ATT_HL_UNKNOWN:
1498 pseudo_header->atm.type = TRAF_UNKNOWN;
1499 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1503 pseudo_header->atm.type = TRAF_LLCMX;
1504 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1508 pseudo_header->atm.type = TRAF_VCMX;
1509 switch (frame4->atm_info.AppHLType) {
1512 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1515 case AHLT_VCMX_802_3_FCS:
1516 pseudo_header->atm.subtype =
1517 TRAF_ST_VCMX_802_3_FCS;
1520 case AHLT_VCMX_802_4_FCS:
1521 pseudo_header->atm.subtype =
1522 TRAF_ST_VCMX_802_4_FCS;
1525 case AHLT_VCMX_802_5_FCS:
1526 pseudo_header->atm.subtype =
1527 TRAF_ST_VCMX_802_5_FCS;
1530 case AHLT_VCMX_FDDI_FCS:
1531 pseudo_header->atm.subtype =
1532 TRAF_ST_VCMX_FDDI_FCS;
1535 case AHLT_VCMX_802_6_FCS:
1536 pseudo_header->atm.subtype =
1537 TRAF_ST_VCMX_802_6_FCS;
1540 case AHLT_VCMX_802_3:
1541 pseudo_header->atm.subtype = TRAF_ST_VCMX_802_3;
1544 case AHLT_VCMX_802_4:
1545 pseudo_header->atm.subtype = TRAF_ST_VCMX_802_4;
1548 case AHLT_VCMX_802_5:
1549 pseudo_header->atm.subtype = TRAF_ST_VCMX_802_5;
1552 case AHLT_VCMX_FDDI:
1553 pseudo_header->atm.subtype = TRAF_ST_VCMX_FDDI;
1556 case AHLT_VCMX_802_6:
1557 pseudo_header->atm.subtype = TRAF_ST_VCMX_802_6;
1560 case AHLT_VCMX_FRAGMENTS:
1561 pseudo_header->atm.subtype =
1562 TRAF_ST_VCMX_FRAGMENTS;
1565 case AHLT_VCMX_BPDU:
1566 pseudo_header->atm.subtype = TRAF_ST_VCMX_BPDU;
1570 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1576 pseudo_header->atm.type = TRAF_LANE;
1577 switch (frame4->atm_info.AppHLType) {
1580 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1583 case AHLT_LANE_LE_CTRL:
1584 pseudo_header->atm.subtype =
1585 TRAF_ST_LANE_LE_CTRL;
1588 case AHLT_LANE_802_3:
1589 pseudo_header->atm.subtype = TRAF_ST_LANE_802_3;
1592 case AHLT_LANE_802_5:
1593 pseudo_header->atm.subtype = TRAF_ST_LANE_802_5;
1596 case AHLT_LANE_802_3_MC:
1597 pseudo_header->atm.subtype =
1598 TRAF_ST_LANE_802_3_MC;
1601 case AHLT_LANE_802_5_MC:
1602 pseudo_header->atm.subtype =
1603 TRAF_ST_LANE_802_5_MC;
1607 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1613 pseudo_header->atm.type = TRAF_ILMI;
1614 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1618 pseudo_header->atm.type = TRAF_FR;
1619 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1623 pseudo_header->atm.type = TRAF_SPANS;
1624 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1627 case ATT_HL_IPSILON:
1628 pseudo_header->atm.type = TRAF_IPSILON;
1629 switch (frame4->atm_info.AppHLType) {
1632 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1635 case AHLT_IPSILON_FT0:
1636 pseudo_header->atm.subtype =
1637 TRAF_ST_IPSILON_FT0;
1640 case AHLT_IPSILON_FT1:
1641 pseudo_header->atm.subtype =
1642 TRAF_ST_IPSILON_FT1;
1645 case AHLT_IPSILON_FT2:
1646 pseudo_header->atm.subtype =
1647 TRAF_ST_IPSILON_FT2;
1651 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1657 pseudo_header->atm.type = TRAF_UNKNOWN;
1658 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1664 pseudo_header->atm.aal = AAL_USER;
1665 pseudo_header->atm.type = TRAF_UNKNOWN;
1666 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1669 case ATT_AAL_SIGNALLING:
1670 pseudo_header->atm.aal = AAL_SIGNALLING;
1671 pseudo_header->atm.type = TRAF_UNKNOWN;
1672 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1676 pseudo_header->atm.aal = AAL_OAMCELL;
1677 pseudo_header->atm.type = TRAF_UNKNOWN;
1678 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1682 pseudo_header->atm.aal = AAL_UNKNOWN;
1683 pseudo_header->atm.type = TRAF_UNKNOWN;
1684 pseudo_header->atm.subtype = TRAF_ST_UNKNOWN;
1687 pseudo_header->atm.vpi = vpi;
1688 pseudo_header->atm.vci = vci;
1689 pseudo_header->atm.channel = pletohs(&frame4->atm_info.channel);
1690 pseudo_header->atm.cells = pletohs(&frame4->atm_info.cells);
1691 pseudo_header->atm.aal5t_u2u = pletohs(&frame4->atm_info.Trailer.aal5t_u2u);
1692 pseudo_header->atm.aal5t_len = pletohs(&frame4->atm_info.Trailer.aal5t_len);
1693 pseudo_header->atm.aal5t_chksum = pntohl(&frame4->atm_info.Trailer.aal5t_chksum);
1696 static gboolean ngsniffer_read_frame6(wtap *wth, gboolean is_random,
1697 struct frame6_rec *frame6, int *err)
1701 /* Read the f_frame6_struct */
1702 bytes_read = ng_file_read(frame6, 1, sizeof *frame6, wth, is_random,
1704 if (bytes_read != sizeof *frame6) {
1706 *err = WTAP_ERR_SHORT_READ;
1712 static void set_pseudo_header_frame6(wtap *wth,
1713 union wtap_pseudo_header *pseudo_header,
1714 struct frame6_rec *frame6 _U_)
1716 /* XXX - Once the frame format is divined, something will most likely go here */
1718 switch (wth->file_encap) {
1720 case WTAP_ENCAP_ETHERNET:
1721 /* XXX - is there an FCS? */
1722 pseudo_header->eth.fcs_len = -1;
1727 static gboolean ngsniffer_read_rec_data(wtap *wth, gboolean is_random,
1728 guchar *pd, size_t length, int *err)
1732 bytes_read = ng_file_read(pd, 1, length, wth, is_random, err);
1734 if (bytes_read != (gint64) length) {
1736 *err = WTAP_ERR_SHORT_READ;
1743 * OK, this capture is from an "Internetwork analyzer", and we either
1744 * didn't see a type 7 record or it had a network type such as NET_HDLC
1745 * that doesn't tell us which *particular* HDLC derivative this is;
1746 * let's look at the first few bytes of the packet, a pointer to which
1747 * was passed to us as an argument, and see whether it looks like PPP,
1748 * Frame Relay, Wellfleet HDLC, Cisco HDLC, or LAPB - or, if it's none
1749 * of those, assume it's LAPD.
1751 * (XXX - are there any "Internetwork analyzer" captures that don't
1752 * have type 7 records? If so, is there some other field that will
1753 * tell us what type of capture it is?)
1755 static int infer_pkt_encap(const guint8 *pd, int len)
1761 * Nothing to infer, but it doesn't matter how you
1762 * dissect an empty packet. Let's just say PPP.
1764 return WTAP_ENCAP_PPP_WITH_PHDR;
1767 if (pd[0] == 0xFF) {
1769 * PPP. (XXX - check for 0xFF 0x03?)
1771 return WTAP_ENCAP_PPP_WITH_PHDR;
1775 if (pd[0] == 0x07 && pd[1] == 0x03) {
1779 return WTAP_ENCAP_WFLEET_HDLC;
1780 } else if ((pd[0] == 0x0F && pd[1] == 0x00) ||
1781 (pd[0] == 0x8F && pd[1] == 0x00)) {
1785 return WTAP_ENCAP_CHDLC_WITH_PHDR;
1789 * Check for Frame Relay. Look for packets with at least
1790 * 3 bytes of header - 2 bytes of DLCI followed by 1 byte
1791 * of control, which, for now, we require to be 0x03 (UI),
1792 * although there might be other frame types as well.
1793 * Scan forward until we see the last DLCI byte, with
1794 * the low-order bit being 1, and then check the next
1795 * byte to see if it's a control byte.
1797 * XXX - in version 4 and 5 captures, wouldn't this just
1798 * have a capture subtype of NET_FRAME_RELAY? Or is this
1799 * here only to handle other versions of the capture
1800 * file, where we might just not yet have found where
1801 * the subtype is specified in the capture?
1803 * Bay^H^H^HNortel Networks has a mechanism in the Optivity
1804 * software for some of their routers to save captures
1805 * in Sniffer format; they use a version number of 4.9, but
1806 * don't put out any header records before the first FRAME2
1807 * record. That means we have to use heuristics to guess
1808 * what type of packet we have.
1810 for (i = 0; i < len && (pd[i] & 0x01) == 0; i++)
1812 i++; /* advance to the byte after the last DLCI byte */
1817 return WTAP_ENCAP_LAPB;
1820 return WTAP_ENCAP_FRELAY_WITH_PHDR;
1824 * Assume LAPB, for now. If we support other HDLC encapsulations,
1825 * we can check whether the low-order bit of the first byte is
1826 * set (as it should be for LAPB) if no other checks pass.
1828 * Or, if it's truly impossible to distinguish ISDN from non-ISDN
1829 * captures, we could assume it's ISDN if it's not anything
1832 return WTAP_ENCAP_LAPB;
1835 static int fix_pseudo_header(int encap, const guint8 *pd, int len,
1836 union wtap_pseudo_header *pseudo_header)
1840 case WTAP_ENCAP_PER_PACKET:
1842 * Infer the packet type from the first two bytes.
1844 encap = infer_pkt_encap(pd, len);
1847 * Fix up the pseudo-header to match the new
1848 * encapsulation type.
1852 case WTAP_ENCAP_WFLEET_HDLC:
1853 case WTAP_ENCAP_CHDLC_WITH_PHDR:
1854 case WTAP_ENCAP_PPP_WITH_PHDR:
1855 if (pseudo_header->x25.flags == 0)
1856 pseudo_header->p2p.sent = TRUE;
1858 pseudo_header->p2p.sent = FALSE;
1861 case WTAP_ENCAP_ISDN:
1862 if (pseudo_header->x25.flags == 0x00)
1863 pseudo_header->isdn.uton = FALSE;
1865 pseudo_header->isdn.uton = TRUE;
1868 * XXX - this is currently a per-packet
1869 * encapsulation type, and we can't determine
1870 * whether a capture is an ISDN capture before
1871 * seeing any packets, and B-channel PPP packets
1872 * look like PPP packets and are given
1873 * WTAP_ENCAP_PPP_WITH_PHDR, not WTAP_ENCAP_ISDN,
1874 * so we assume this is a D-channel packet and
1875 * thus give it a channel number of 0.
1877 pseudo_header->isdn.channel = 0;
1882 case WTAP_ENCAP_ATM_PDUS:
1884 * If the Windows Sniffer writes out one of its ATM
1885 * capture files in DOS Sniffer format, it doesn't
1886 * distinguish between LE Control and LANE encapsulated
1887 * LAN frames, it just marks them as LAN frames,
1888 * so we fix that up here.
1890 * I've also seen DOS Sniffer captures claiming that
1891 * LANE packets that *don't* start with FF 00 are
1892 * marked as LE Control frames, so we fix that up
1895 if (pseudo_header->atm.type == TRAF_LANE && len >= 2) {
1896 if (pd[0] == 0xff && pd[1] == 0x00) {
1898 * This must be LE Control.
1900 pseudo_header->atm.subtype =
1901 TRAF_ST_LANE_LE_CTRL;
1904 * This can't be LE Control.
1906 if (pseudo_header->atm.subtype ==
1907 TRAF_ST_LANE_LE_CTRL) {
1909 * XXX - Ethernet or Token Ring?
1911 pseudo_header->atm.subtype =
1921 /* Throw away the buffers used by the sequential I/O stream, but not
1922 those used by the random I/O stream. */
1923 static void ngsniffer_sequential_close(wtap *wth)
1925 if (wth->capture.ngsniffer->seq.buf != NULL) {
1926 g_free(wth->capture.ngsniffer->seq.buf);
1927 wth->capture.ngsniffer->seq.buf = NULL;
1931 static void free_blob(gpointer data, gpointer user_data _U_)
1936 /* Close stuff used by the random I/O stream, if any, and free up any
1937 private data structures. (If there's a "sequential_close" routine
1938 for a capture file type, it'll be called before the "close" routine
1939 is called, so we don't have to free the sequential buffer here.) */
1940 static void ngsniffer_close(wtap *wth)
1942 if (wth->capture.ngsniffer->rand.buf != NULL)
1943 g_free(wth->capture.ngsniffer->rand.buf);
1944 if (wth->capture.ngsniffer->first_blob != NULL) {
1945 g_list_foreach(wth->capture.ngsniffer->first_blob, free_blob, NULL);
1946 g_list_free(wth->capture.ngsniffer->first_blob);
1948 g_free(wth->capture.ngsniffer);
1951 static const int wtap_encap[] = {
1952 -1, /* WTAP_ENCAP_UNKNOWN -> unsupported */
1953 1, /* WTAP_ENCAP_ETHERNET */
1954 0, /* WTAP_ENCAP_TOKEN_RING */
1955 -1, /* WTAP_ENCAP_SLIP -> unsupported */
1956 7, /* WTAP_ENCAP_PPP -> Internetwork analyzer (synchronous) FIXME ! */
1957 9, /* WTAP_ENCAP_FDDI */
1958 9, /* WTAP_ENCAP_FDDI_BITSWAPPED */
1959 -1, /* WTAP_ENCAP_RAW_IP -> unsupported */
1960 2, /* WTAP_ENCAP_ARCNET */
1961 -1, /* WTAP_ENCAP_ATM_RFC1483 */
1962 -1, /* WTAP_ENCAP_LINUX_ATM_CLIP */
1963 7, /* WTAP_ENCAP_LAPB -> Internetwork analyzer (synchronous) */
1964 -1, /* WTAP_ENCAP_ATM_PDUS */
1965 -1, /* WTAP_ENCAP_NULL -> unsupported */
1966 -1, /* WTAP_ENCAP_ASCEND -> unsupported */
1967 -1, /* WTAP_ENCAP_ISDN -> unsupported */
1968 -1, /* WTAP_ENCAP_IP_OVER_FC -> unsupported */
1969 7, /* WTAP_ENCAP_PPP_WITH_PHDR -> Internetwork analyzer (synchronous) FIXME ! */
1971 #define NUM_WTAP_ENCAPS (sizeof wtap_encap / sizeof wtap_encap[0])
1973 /* Returns 0 if we could write the specified encapsulation type,
1974 an error indication otherwise. */
1975 int ngsniffer_dump_can_write_encap(int encap)
1977 /* Per-packet encapsulations aren't supported. */
1978 if (encap == WTAP_ENCAP_PER_PACKET)
1979 return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED;
1981 if (encap < 0 || (unsigned)encap >= NUM_WTAP_ENCAPS || wtap_encap[encap] == -1)
1982 return WTAP_ERR_UNSUPPORTED_ENCAP;
1987 /* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
1989 gboolean ngsniffer_dump_open(wtap_dumper *wdh, gboolean cant_seek _U_, int *err)
1992 char buf[6] = {REC_VERS, 0x00, 0x12, 0x00, 0x00, 0x00}; /* version record */
1994 /* This is a sniffer file */
1995 wdh->subtype_write = ngsniffer_dump;
1996 wdh->subtype_close = ngsniffer_dump_close;
1998 wdh->dump.ngsniffer = g_malloc(sizeof(ngsniffer_dump_t));
1999 wdh->dump.ngsniffer->first_frame = TRUE;
2000 wdh->dump.ngsniffer->start = 0;
2002 /* Write the file header. */
2003 nwritten = fwrite(ngsniffer_magic, 1, sizeof ngsniffer_magic, wdh->fh);
2004 if (nwritten != sizeof ngsniffer_magic) {
2005 if (nwritten == 0 && ferror(wdh->fh))
2008 *err = WTAP_ERR_SHORT_WRITE;
2011 nwritten = fwrite(buf, 1, 6, wdh->fh);
2012 if (nwritten != 6) {
2013 if (nwritten == 0 && ferror(wdh->fh))
2016 *err = WTAP_ERR_SHORT_WRITE;
2023 /* Write a record for a packet to a dump file.
2024 Returns TRUE on success, FALSE on failure. */
2025 static gboolean ngsniffer_dump(wtap_dumper *wdh, const struct wtap_pkthdr *phdr,
2026 const union wtap_pseudo_header *pseudo_header, const guchar *pd, int *err)
2028 ngsniffer_dump_t *priv = wdh->dump.ngsniffer;
2029 struct frame2_rec rec_hdr;
2034 guint16 t_low, t_med;
2036 struct vers_rec version;
2037 gint16 maj_vers, min_vers;
2041 /* Sniffer files have a capture start date in the file header, and
2042 have times relative to the beginning of that day in the packet
2043 headers; pick the date of the first packet as the capture start
2045 if (priv->first_frame) {
2046 priv->first_frame=FALSE;
2047 tm = localtime(&phdr->ts.secs);
2049 start_date = (tm->tm_year - (1980 - 1900)) << 9;
2050 start_date |= (tm->tm_mon + 1) << 5;
2051 start_date |= tm->tm_mday;
2052 /* record the start date, not the start time */
2053 priv->start = phdr->ts.secs - (3600*tm->tm_hour + 60*tm->tm_min + tm->tm_sec);
2059 /* "sniffer" version ? */
2062 version.maj_vers = htoles(maj_vers);
2063 version.min_vers = htoles(min_vers);
2065 version.date = htoles(start_date);
2067 version.network = wtap_encap[wdh->encap];
2069 version.timeunit = 1; /* 0.838096 */
2070 version.cmprs_vers = 0;
2071 version.cmprs_level = 0;
2072 version.rsvd[0] = 0;
2073 version.rsvd[1] = 0;
2074 nwritten = fwrite(&version, 1, sizeof version, wdh->fh);
2075 if (nwritten != sizeof version) {
2076 if (nwritten == 0 && ferror(wdh->fh))
2079 *err = WTAP_ERR_SHORT_WRITE;
2084 buf[0] = REC_FRAME2;
2086 buf[2] = (char)((phdr->caplen + sizeof(struct frame2_rec))%256);
2087 buf[3] = (char)((phdr->caplen + sizeof(struct frame2_rec))/256);
2090 nwritten = fwrite(buf, 1, 6, wdh->fh);
2091 if (nwritten != 6) {
2092 if (nwritten == 0 && ferror(wdh->fh))
2095 *err = WTAP_ERR_SHORT_WRITE;
2098 /* Seconds since the start of the capture */
2099 tsecs = phdr->ts.secs - priv->start;
2100 /* Extract the number of days since the start of the capture */
2101 rec_hdr.time_day = (guint8)(tsecs / 86400); /* # days of capture - 86400 secs/day */
2102 tsecs -= rec_hdr.time_day * 86400; /* time within day */
2103 /* Convert to picoseconds */
2104 t = tsecs*G_GINT64_CONSTANT(1000000000000U) +
2105 phdr->ts.nsecs*G_GINT64_CONSTANT(1000U);
2106 /* Convert to units of timeunit = 1 */
2108 t_low = (guint16)((t >> 0) & 0xFFFF);
2109 t_med = (guint16)((t >> 16) & 0xFFFF);
2110 t_high = (guint8)((t >> 32) & 0xFF);
2111 rec_hdr.time_low = htoles(t_low);
2112 rec_hdr.time_med = htoles(t_med);
2113 rec_hdr.time_high = t_high;
2114 rec_hdr.size = htoles(phdr->caplen);
2115 switch (wdh->encap) {
2117 case WTAP_ENCAP_LAPB:
2118 case WTAP_ENCAP_FRELAY_WITH_PHDR:
2119 rec_hdr.fs = (pseudo_header->x25.flags & FROM_DCE) ? 0x00 : FS_WAN_DTE;
2122 case WTAP_ENCAP_PPP_WITH_PHDR:
2123 case WTAP_ENCAP_SDLC:
2124 rec_hdr.fs = pseudo_header->p2p.sent ? 0x00 : FS_WAN_DTE;
2127 case WTAP_ENCAP_ISDN:
2128 rec_hdr.fs = pseudo_header->isdn.uton ? FS_WAN_DTE : 0x00;
2129 switch (pseudo_header->isdn.channel) {
2131 case 0: /* D-channel */
2132 rec_hdr.fs |= FS_ISDN_CHAN_D;
2135 case 1: /* B1-channel */
2136 rec_hdr.fs |= FS_ISDN_CHAN_B1;
2139 case 2: /* B2-channel */
2140 rec_hdr.fs |= FS_ISDN_CHAN_B2;
2150 rec_hdr.true_size = phdr->len != phdr->caplen ? htoles(phdr->len) : 0;
2152 nwritten = fwrite(&rec_hdr, 1, sizeof rec_hdr, wdh->fh);
2153 if (nwritten != sizeof rec_hdr) {
2154 if (nwritten == 0 && ferror(wdh->fh))
2157 *err = WTAP_ERR_SHORT_WRITE;
2160 nwritten = fwrite(pd, 1, phdr->caplen, wdh->fh);
2161 if (nwritten != phdr->caplen) {
2162 if (nwritten == 0 && ferror(wdh->fh))
2165 *err = WTAP_ERR_SHORT_WRITE;
2171 /* Finish writing to a dump file.
2172 Returns TRUE on success, FALSE on failure. */
2173 static gboolean ngsniffer_dump_close(wtap_dumper *wdh, int *err)
2176 char buf[6] = {REC_EOF, 0x00, 0x00, 0x00, 0x00, 0x00};
2179 nwritten = fwrite(buf, 1, 6, wdh->fh);
2180 if (nwritten != 6) {
2182 if (nwritten == 0 && ferror(wdh->fh))
2185 *err = WTAP_ERR_SHORT_WRITE;
2193 SnifferDecompress() decompresses a blob of compressed data from a
2194 Sniffer(R) capture file.
2196 This function is Copyright (c) 1999-2999 Tim Farley
2199 inbuf - buffer of compressed bytes from file, not including
2200 the preceding length word
2201 inlen - length of inbuf in bytes (max 64k)
2202 outbuf - decompressed contents, could contain a partial Sniffer
2204 outlen - length of outbuf.
2206 Return value is the number of bytes in outbuf on return.
2209 SnifferDecompress( unsigned char * inbuf, size_t inlen,
2210 unsigned char * outbuf, size_t outlen, int *err )
2212 unsigned char * pin = inbuf;
2213 unsigned char * pout = outbuf;
2214 unsigned char * pin_end = pin + inlen;
2215 unsigned char * pout_end = pout + outlen;
2216 unsigned int bit_mask; /* one bit is set in this, to mask with bit_value */
2217 unsigned int bit_value = 0; /* cache the last 16 coding bits we retrieved */
2218 unsigned int code_type; /* encoding type, from high 4 bits of byte */
2219 unsigned int code_low; /* other 4 bits from encoding byte */
2220 int length; /* length of RLE sequence or repeated string */
2221 int offset; /* offset of string to repeat */
2223 if (inlen > G_MAXUINT16) {
2227 bit_mask = 0; /* don't have any bits yet */
2230 /* Shift down the bit mask we use to see whats encoded */
2231 bit_mask = bit_mask >> 1;
2233 /* If there are no bits left, time to get another 16 bits */
2234 if ( 0 == bit_mask )
2236 bit_mask = 0x8000; /* start with the high bit */
2237 bit_value = pletohs(pin); /* get the next 16 bits */
2238 pin += 2; /* skip over what we just grabbed */
2239 if ( pin >= pin_end )
2241 *err = WTAP_ERR_UNC_TRUNCATED; /* data was oddly truncated */
2246 /* Use the bits in bit_value to see what's encoded and what is raw data */
2247 if ( !(bit_mask & bit_value) )
2249 /* bit not set - raw byte we just copy */
2250 *(pout++) = *(pin++);
2254 /* bit set - next item is encoded. Peel off high nybble
2255 of next byte to see the encoding type. Set aside low
2256 nybble while we are at it */
2257 code_type = (unsigned int) ((*pin) >> 4 ) & 0xF;
2258 code_low = (unsigned int) ((*pin) & 0xF );
2259 pin++; /* increment over the code byte we just retrieved */
2260 if ( pin >= pin_end )
2262 *err = WTAP_ERR_UNC_TRUNCATED; /* data was oddly truncated */
2266 /* Based on the code type, decode the compressed string */
2267 switch ( code_type )
2269 case 0 : /* RLE short runs */
2271 Run length is the low nybble of the first code byte.
2272 Byte to repeat immediately follows.
2273 Total code size: 2 bytes.
2275 length = code_low + 3;
2276 /* If length would put us past end of output, avoid overflow */
2277 if ( pout + length > pout_end )
2279 *err = WTAP_ERR_UNC_OVERFLOW;
2283 /* generate the repeated series of bytes */
2284 memset( pout, *pin++, length );
2287 case 1 : /* RLE long runs */
2289 Low 4 bits of run length is the low nybble of the
2290 first code byte, upper 8 bits of run length is in
2292 Byte to repeat immediately follows.
2293 Total code size: 3 bytes.
2295 length = code_low + ((unsigned int)(*pin++) << 4) + 19;
2296 /* If we are already at end of input, there is no byte
2298 if ( pin >= pin_end )
2300 *err = WTAP_ERR_UNC_TRUNCATED; /* data was oddly truncated */
2303 /* If length would put us past end of output, avoid overflow */
2304 if ( pout + length > pout_end )
2306 *err = WTAP_ERR_UNC_OVERFLOW;
2310 /* generate the repeated series of bytes */
2311 memset( pout, *pin++, length );
2314 case 2 : /* LZ77 long strings */
2316 Low 4 bits of offset to string is the low nybble of the
2317 first code byte, upper 8 bits of offset is in
2319 Length of string immediately follows.
2320 Total code size: 3 bytes.
2322 offset = code_low + ((unsigned int)(*pin++) << 4) + 3;
2323 /* If we are already at end of input, there is no byte
2325 if ( pin >= pin_end )
2327 *err = WTAP_ERR_UNC_TRUNCATED; /* data was oddly truncated */
2330 /* Check if offset would put us back past begin of buffer */
2331 if ( pout - offset < outbuf )
2333 *err = WTAP_ERR_UNC_BAD_OFFSET;
2337 /* get length from next byte, make sure it won't overrun buf */
2338 length = (unsigned int)(*pin++) + 16;
2339 if ( pout + length > pout_end )
2341 *err = WTAP_ERR_UNC_OVERFLOW;
2345 /* Copy the string from previous text to output position,
2346 advance output pointer */
2347 memcpy( pout, pout - offset, length );
2350 default : /* (3 to 15): LZ77 short strings */
2352 Low 4 bits of offset to string is the low nybble of the
2353 first code byte, upper 8 bits of offset is in
2355 Length of string to repeat is overloaded into code_type.
2356 Total code size: 2 bytes.
2358 offset = code_low + ((unsigned int)(*pin++) << 4) + 3;
2359 /* Check if offset would put us back past begin of buffer */
2360 if ( pout - offset < outbuf )
2362 *err = WTAP_ERR_UNC_BAD_OFFSET;
2366 /* get length from code_type, make sure it won't overrun buf */
2368 if ( pout + length > pout_end )
2370 *err = WTAP_ERR_UNC_OVERFLOW;
2374 /* Copy the string from previous text to output position,
2375 advance output pointer */
2376 memcpy( pout, pout - offset, length );
2382 /* If we've consumed all the input, we are done */
2383 if ( pin >= pin_end )
2387 return (int) ( pout - outbuf ); /* return length of expanded text */
2391 * XXX - is there any guarantee that this is big enough to hold the
2392 * uncompressed data from any blob?
2394 #define OUTBUF_SIZE 65536
2396 /* Information about a compressed blob; we save the offset in the
2397 underlying compressed file, and the offset in the uncompressed data
2398 stream, of the blob. */
2400 gint64 blob_comp_offset;
2401 gint64 blob_uncomp_offset;
2405 ng_file_read(void *buffer, size_t elementsize, size_t numelements, wtap *wth,
2406 gboolean is_random, int *err)
2409 ngsniffer_comp_stream_t *comp_stream;
2410 size_t copybytes = elementsize * numelements; /* bytes left to be copied */
2411 gint64 copied_bytes = 0; /* bytes already copied */
2412 unsigned char *outbuffer = buffer; /* where to write next decompressed data */
2414 size_t bytes_to_copy;
2418 infile = wth->random_fh;
2419 comp_stream = &wth->capture.ngsniffer->rand;
2422 comp_stream = &wth->capture.ngsniffer->seq;
2425 if (wth->file_type == WTAP_FILE_NGSNIFFER_UNCOMPRESSED) {
2426 errno = WTAP_ERR_CANT_READ;
2427 copied_bytes = file_read(buffer, 1, copybytes, infile);
2428 if ((size_t) copied_bytes != copybytes)
2429 *err = file_error(infile);
2430 return copied_bytes;
2433 /* Allocate the stream buffer if it hasn't already been allocated. */
2434 if (comp_stream->buf == NULL) {
2435 comp_stream->buf = g_malloc(OUTBUF_SIZE);
2438 /* This is the first read of the random file, so we're at
2439 the beginning of the sequence of blobs in the file
2440 (as we've not done any random reads yet to move the
2441 current position in the random stream); set the
2442 current blob to be the first blob. */
2443 wth->capture.ngsniffer->current_blob =
2444 wth->capture.ngsniffer->first_blob;
2446 /* This is the first sequential read; if we also have a
2447 random stream open, allocate the first element for the
2448 list of blobs, and make it the last element as well. */
2449 if (wth->random_fh != NULL) {
2450 g_assert(wth->capture.ngsniffer->first_blob == NULL);
2451 blob = g_malloc(sizeof (blob_info_t));
2452 blob->blob_comp_offset = comp_stream->comp_offset;
2453 blob->blob_uncomp_offset = comp_stream->uncomp_offset;
2454 wth->capture.ngsniffer->first_blob =
2455 g_list_append(wth->capture.ngsniffer->first_blob, blob);
2456 wth->capture.ngsniffer->last_blob =
2457 wth->capture.ngsniffer->first_blob;
2461 /* Now read the first blob into the buffer. */
2462 if (read_blob(infile, comp_stream, err) < 0)
2465 while (copybytes > 0) {
2466 bytes_left = comp_stream->nbytes - comp_stream->nextout;
2467 if (bytes_left == 0) {
2468 /* There's no decompressed stuff left to copy from the current
2469 blob; get the next blob. */
2472 /* Move to the next blob in the list. */
2473 wth->capture.ngsniffer->current_blob =
2474 g_list_next(wth->capture.ngsniffer->current_blob);
2475 blob = wth->capture.ngsniffer->current_blob->data;
2477 /* If we also have a random stream open, add a new element,
2478 for this blob, to the list of blobs; we know the list is
2479 non-empty, as we initialized it on the first sequential
2480 read, so we just add the new element at the end, and
2481 adjust the pointer to the last element to refer to it. */
2482 if (wth->random_fh != NULL) {
2483 blob = g_malloc(sizeof (blob_info_t));
2484 blob->blob_comp_offset = comp_stream->comp_offset;
2485 blob->blob_uncomp_offset = comp_stream->uncomp_offset;
2486 wth->capture.ngsniffer->last_blob =
2487 g_list_append(wth->capture.ngsniffer->last_blob, blob);
2491 if (read_blob(infile, comp_stream, err) < 0)
2493 bytes_left = comp_stream->nbytes - comp_stream->nextout;
2496 bytes_to_copy = copybytes;
2497 if (bytes_to_copy > bytes_left)
2498 bytes_to_copy = bytes_left;
2499 memcpy(outbuffer, &comp_stream->buf[comp_stream->nextout],
2501 copybytes -= bytes_to_copy;
2502 copied_bytes += bytes_to_copy;
2503 outbuffer += bytes_to_copy;
2504 comp_stream->nextout += (int) bytes_to_copy;
2505 comp_stream->uncomp_offset += bytes_to_copy;
2507 return copied_bytes;
2510 /* Read a blob from a compressed stream.
2511 Return -1 and set "*err" on error, otherwise return 0. */
2513 read_blob(FILE_T infile, ngsniffer_comp_stream_t *comp_stream, int *err)
2517 unsigned short blob_len;
2518 gint16 blob_len_host;
2519 gboolean uncompressed;
2520 unsigned char file_inbuf[65536];
2523 /* Read one 16-bit word which is length of next compressed blob */
2524 errno = WTAP_ERR_CANT_READ;
2525 read_len = file_read(&blob_len, 1, 2, infile);
2526 if (2 != read_len) {
2527 *err = file_error(infile);
2530 comp_stream->comp_offset += 2;
2531 blob_len_host = pletohs(&blob_len);
2533 /* Compressed or uncompressed? */
2534 if (blob_len_host < 0) {
2535 /* Uncompressed blob; blob length is absolute value of the number. */
2536 in_len = -blob_len_host;
2537 uncompressed = TRUE;
2539 in_len = blob_len_host;
2540 uncompressed = FALSE;
2544 errno = WTAP_ERR_CANT_READ;
2545 read_len = file_read(file_inbuf, 1, in_len, infile);
2546 if ((size_t) in_len != read_len) {
2547 *err = file_error(infile);
2550 comp_stream->comp_offset += in_len;
2553 memcpy(comp_stream->buf, file_inbuf, in_len);
2556 /* Decompress the blob */
2557 out_len = SnifferDecompress(file_inbuf, in_len,
2558 comp_stream->buf, OUTBUF_SIZE, err);
2562 comp_stream->nextout = 0;
2563 comp_stream->nbytes = out_len;
2567 /* Seek in the sequential data stream; we can only seek forward, and we
2568 do it on compressed files by skipping forward. */
2570 ng_file_seek_seq(wtap *wth, gint64 offset, int whence, int *err)
2574 long amount_to_read;
2576 if (wth->file_type == WTAP_FILE_NGSNIFFER_UNCOMPRESSED)
2577 return file_seek(wth->fh, offset, whence, err);
2582 break; /* "offset" is the target offset */
2585 offset += wth->capture.ngsniffer->seq.uncomp_offset;
2586 break; /* "offset" is relative to the current offset */
2589 g_assert_not_reached(); /* "offset" is relative to the end of the file... */
2590 break; /* ...but we don't know where that is. */
2593 delta = offset - wth->capture.ngsniffer->seq.uncomp_offset;
2594 g_assert(delta >= 0);
2596 /* Ok, now read and discard "delta" bytes. */
2597 while (delta != 0) {
2598 amount_to_read = (long) delta;
2599 if ((unsigned long)amount_to_read > sizeof buf)
2600 amount_to_read = sizeof buf;
2601 if (ng_file_read(buf, 1, amount_to_read, wth, FALSE, err) < 0)
2602 return -1; /* error */
2603 delta -= amount_to_read;
2608 /* Seek in the random data stream.
2610 On compressed files, we see whether we're seeking to a position within
2611 the blob we currently have in memory and, if not, we find in the list
2612 of blobs the last blob that starts at or before the position to which
2613 we're seeking, and read that blob in. We can then move to the appropriate
2614 position within the blob we have in memory (whether it's the blob we
2615 already had in memory or, if necessary, the one we read in). */
2617 ng_file_seek_rand(wtap *wth, gint64 offset, int whence, int *err)
2619 ngsniffer_t *ngsniffer;
2622 blob_info_t *next_blob, *new_blob;
2624 if (wth->file_type == WTAP_FILE_NGSNIFFER_UNCOMPRESSED)
2625 return file_seek(wth->random_fh, offset, whence, err);
2627 ngsniffer = wth->capture.ngsniffer;
2632 break; /* "offset" is the target offset */
2635 offset += ngsniffer->rand.uncomp_offset;
2636 break; /* "offset" is relative to the current offset */
2639 g_assert_not_reached(); /* "offset" is relative to the end of the file... */
2640 break; /* ...but we don't know where that is. */
2643 delta = offset - ngsniffer->rand.uncomp_offset;
2645 /* Is the place to which we're seeking within the current buffer, or
2646 will we have to read a different blob into the buffer? */
2649 /* We're going forwards.
2650 Is the place to which we're seeking within the current buffer? */
2651 if ((size_t)(ngsniffer->rand.nextout + delta) >= ngsniffer->rand.nbytes) {
2652 /* No. Search for a blob that contains the target offset in
2653 the uncompressed byte stream, starting with the blob
2654 following the current blob. */
2655 new = g_list_next(ngsniffer->current_blob);
2657 next = g_list_next(new);
2659 /* No more blobs; the current one is it. */
2663 next_blob = next->data;
2664 /* Does the next blob start after the target offset?
2665 If so, the current blob is the one we want. */
2666 if (next_blob->blob_uncomp_offset > offset)
2672 } else if (delta < 0) {
2673 /* We're going backwards.
2674 Is the place to which we're seeking within the current buffer? */
2675 if (ngsniffer->rand.nextout + delta < 0) {
2676 /* No. Search for a blob that contains the target offset in
2677 the uncompressed byte stream, starting with the blob
2678 preceding the current blob. */
2679 new = g_list_previous(ngsniffer->current_blob);
2681 /* Does this blob start at or before the target offset?
2682 If so, the current blob is the one we want. */
2683 new_blob = new->data;
2684 if (new_blob->blob_uncomp_offset <= offset)
2687 /* It doesn't - skip to the previous blob. */
2688 new = g_list_previous(new);
2694 /* The place to which we're seeking isn't in the current buffer;
2695 move to a new blob. */
2696 new_blob = new->data;
2698 /* Seek in the compressed file to the offset in the compressed file
2699 of the beginning of that blob. */
2700 if (file_seek(wth->random_fh, new_blob->blob_comp_offset, SEEK_SET, err) == -1)
2703 /* Make the blob we found the current one. */
2704 ngsniffer->current_blob = new;
2706 /* Now set the current offsets to the offsets of the beginning
2708 ngsniffer->rand.uncomp_offset = new_blob->blob_uncomp_offset;
2709 ngsniffer->rand.comp_offset = new_blob->blob_comp_offset;
2711 /* Now fill the buffer. */
2712 if (read_blob(wth->random_fh, &ngsniffer->rand, err) < 0)
2715 /* Set "delta" to the amount to move within this blob; it had
2716 better be >= 0, and < the amount of uncompressed data in
2717 the blob, as otherwise it'd mean we need to seek before
2718 the beginning or after the end of this blob. */
2719 delta = offset - ngsniffer->rand.uncomp_offset;
2720 g_assert(delta >= 0 && (unsigned long)delta < ngsniffer->rand.nbytes);
2723 /* OK, the place to which we're seeking is in the buffer; adjust
2724 "ngsniffer->rand.nextout" to point to the place to which
2725 we're seeking, and adjust "ngsniffer->rand.uncomp_offset" to be
2726 the destination offset. */
2727 ngsniffer->rand.nextout += (int) delta;
2728 ngsniffer->rand.uncomp_offset += delta;