2 * Copyright (c) 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 * savefile.c - supports offline use of tcpdump
22 * Extraction/creation by Jeffrey Mogul, DECWRL
23 * Modified by Steve McCanne, LBL.
25 * Used to save the received packet headers, after filtering, to
26 * a file, and then read them later.
27 * The first record in the file contains saved values for the machine
28 * dependent values so we can print the dump file on any architecture.
32 static const char rcsid[] _U_ =
33 "@(#) $Header: /tcpdump/master/libpcap/savefile.c,v 1.126 2005/02/08 20:03:16 guy Exp $ (LBL)";
48 #ifdef HAVE_OS_PROTO_H
53 * Standard libpcap format.
55 #define TCPDUMP_MAGIC 0xa1b2c3d4
58 * Alexey Kuznetzov's modified libpcap format.
60 #define KUZNETZOV_TCPDUMP_MAGIC 0xa1b2cd34
63 * Reserved for Francisco Mesquita <francisco.mesquita@radiomovel.pt>
64 * for another modified format.
66 #define FMESQUITA_TCPDUMP_MAGIC 0xa1b234cd
69 * Navtel Communcations' format, with nanosecond timestamps,
70 * as per a request from Dumas Hwang <dumas.hwang@navtelcom.com>.
72 #define NAVTEL_TCPDUMP_MAGIC 0xa12b3c4d
75 * We use the "receiver-makes-right" approach to byte order,
76 * because time is at a premium when we are writing the file.
77 * In other words, the pcap_file_header and pcap_pkthdr,
78 * records are written in host byte order.
79 * Note that the bytes of packet data are written out in the order in
80 * which they were received, so multi-byte fields in packets are not
81 * written in host byte order, they're written in whatever order the
82 * sending machine put them in.
84 * ntoh[ls] aren't sufficient because we might need to swap on a big-endian
85 * machine (if the file was written in little-end order).
88 ((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
89 #define SWAPSHORT(y) \
90 ( (((y)&0xff)<<8) | ((u_short)((y)&0xff00)>>8) )
93 #define SFERR_BADVERSION 2
95 #define SFERR_EOF 4 /* not really an error, just a status */
98 * Setting O_BINARY on DOS/Windows is a bit tricky
101 #define SET_BINMODE(f) _setmode(fileno(f), O_BINARY)
103 #if defined(__HIGHC__)
104 #define SET_BINMODE(f) setmode(f, O_BINARY)
106 #define SET_BINMODE(f) setmode(fileno(f), O_BINARY)
111 * We don't write DLT_* values to the capture file header, because
112 * they're not the same on all platforms.
114 * Unfortunately, the various flavors of BSD have not always used the same
115 * numerical values for the same data types, and various patches to
116 * libpcap for non-BSD OSes have added their own DLT_* codes for link
117 * layer encapsulation types seen on those OSes, and those codes have had,
118 * in some cases, values that were also used, on other platforms, for other
119 * link layer encapsulation types.
121 * This means that capture files of a type whose numerical DLT_* code
122 * means different things on different BSDs, or with different versions
123 * of libpcap, can't always be read on systems other than those like
124 * the one running on the machine on which the capture was made.
126 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes
127 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_*
128 * codes to DLT_* codes when reading a savefile header.
130 * For those DLT_* codes that have, as far as we know, the same values on
131 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as
132 * DLT_xxx; that way, captures of those types can still be read by
133 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and
134 * captures of those types written by versions of libpcap that map DLT_
135 * values to LINKTYPE_ values can still be read by older versions
138 * The other LINKTYPE_* codes are given values starting at 100, in the
139 * hopes that no DLT_* code will be given one of those values.
141 * In order to ensure that a given LINKTYPE_* code's value will refer to
142 * the same encapsulation type on all platforms, you should not allocate
143 * a new LINKTYPE_* value without consulting "tcpdump-workers@tcpdump.org".
144 * The tcpdump developers will allocate a value for you, and will not
145 * subsequently allocate it to anybody else; that value will be added to
146 * the "pcap.h" in the tcpdump.org CVS repository, so that a future
147 * libpcap release will include it.
149 * You should, if possible, also contribute patches to libpcap and tcpdump
150 * to handle the new encapsulation type, so that they can also be checked
151 * into the tcpdump.org CVS repository and so that they will appear in
152 * future libpcap and tcpdump releases.
154 * Do *NOT* assume that any values after the largest value in this file
155 * are available; you might not have the most up-to-date version of this
156 * file, and new values after that one might have been assigned. Also,
157 * do *NOT* use any values below 100 - those might already have been
158 * taken by one (or more!) organizations.
160 #define LINKTYPE_NULL DLT_NULL
161 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */
162 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */
163 #define LINKTYPE_AX25 DLT_AX25
164 #define LINKTYPE_PRONET DLT_PRONET
165 #define LINKTYPE_CHAOS DLT_CHAOS
166 #define LINKTYPE_TOKEN_RING DLT_IEEE802 /* DLT_IEEE802 is used for Token Ring */
167 #define LINKTYPE_ARCNET DLT_ARCNET /* BSD-style headers */
168 #define LINKTYPE_SLIP DLT_SLIP
169 #define LINKTYPE_PPP DLT_PPP
170 #define LINKTYPE_FDDI DLT_FDDI
173 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662
174 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol
175 * field) at the beginning of the packet.
177 * This is for use when there is always such a header; the address field
178 * might be 0xff, for regular PPP, or it might be an address field for Cisco
179 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco
180 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL.
182 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that
183 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL
184 * captures will be written out with a link type that NetBSD's tcpdump
187 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */
189 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */
191 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */
193 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */
194 #define LINKTYPE_RAW 101 /* raw IP */
195 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */
196 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */
197 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */
198 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */
199 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */
200 #define LINKTYPE_FRELAY 107 /* Frame Relay */
201 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */
202 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */
205 * These three types are reserved for future use.
207 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */
208 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */
209 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */
211 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */
212 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */
213 #define LINKTYPE_ECONET 115 /* Acorn Econet */
216 * Reserved for use with OpenBSD ipfilter.
218 #define LINKTYPE_IPFILTER 116
220 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */
221 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */
222 #define LINKTYPE_PRISM_HEADER 119 /* 802.11+Prism II monitor mode */
223 #define LINKTYPE_AIRONET_HEADER 120 /* FreeBSD Aironet driver stuff */
226 * Reserved for Siemens HiPath HDLC.
228 #define LINKTYPE_HHDLC 121
230 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */
231 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */
234 * Reserved as per request from Kent Dahlgren <kent@praesum.com>
237 #define LINKTYPE_RIO 124 /* RapidIO */
238 #define LINKTYPE_PCI_EXP 125 /* PCI Express */
239 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */
241 #define LINKTYPE_IEEE802_11_RADIO 127 /* 802.11 plus BSD radio header */
244 * Reserved for the TZSP encapsulation, as per request from
245 * Chris Waters <chris.waters@networkchemistry.com>
246 * TZSP is a generic encapsulation for any other link type,
247 * which includes a means to include meta-information
248 * with the packet, e.g. signal strength and channel
249 * for 802.11 packets.
251 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */
253 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */
256 * Juniper-private data link types, as per request from
257 * Hannes Gredler <hannes@juniper.net>. The corresponding
258 * DLT_s are used for passing on chassis-internal
259 * metainformation such as QOS profiles, etc..
261 #define LINKTYPE_JUNIPER_MLPPP 130
262 #define LINKTYPE_JUNIPER_MLFR 131
263 #define LINKTYPE_JUNIPER_ES 132
264 #define LINKTYPE_JUNIPER_GGSN 133
265 #define LINKTYPE_JUNIPER_MFR 134
266 #define LINKTYPE_JUNIPER_ATM2 135
267 #define LINKTYPE_JUNIPER_SERVICES 136
268 #define LINKTYPE_JUNIPER_ATM1 137
270 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */
272 #define LINKTYPE_RAWSS7 139 /* see rawss7.h for */
273 #define LINKTYPE_RAWSS7_MTP2 140 /* information on these */
274 #define LINKTYPE_RAWSS7_MTP3 141 /* definitions */
275 #define LINKTYPE_RAWSS7_SCCP 142
277 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */
279 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */
282 * Reserved for IBM SP switch and IBM Next Federation switch.
284 #define LINKTYPE_IBM_SP 145
285 #define LINKTYPE_IBM_SN 146
288 * Reserved for private use. If you have some link-layer header type
289 * that you want to use within your organization, with the capture files
290 * using that link-layer header type not ever be sent outside your
291 * organization, you can use these values.
293 * No libpcap release will use these for any purpose, nor will any
294 * tcpdump release use them, either.
296 * Do *NOT* use these in capture files that you expect anybody not using
297 * your private versions of capture-file-reading tools to read; in
298 * particular, do *NOT* use them in products, otherwise you may find that
299 * people won't be able to use tcpdump, or snort, or Ethereal, or... to
300 * read capture files from your firewall/intrusion detection/traffic
301 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value,
302 * and you may also find that the developers of those applications will
303 * not accept patches to let them read those files.
305 * Also, do not use them if somebody might send you a capture using them
306 * for *their* private type and tools using them for *your* private type
307 * would have to read them.
309 * Instead, in those cases, ask "tcpdump-workers@tcpdump.org" for a new DLT_
310 * and LINKTYPE_ value, as per the comment in pcap-bpf.h, and use the type
313 #define LINKTYPE_USER0 147
314 #define LINKTYPE_USER1 148
315 #define LINKTYPE_USER2 149
316 #define LINKTYPE_USER3 150
317 #define LINKTYPE_USER4 151
318 #define LINKTYPE_USER5 152
319 #define LINKTYPE_USER6 153
320 #define LINKTYPE_USER7 154
321 #define LINKTYPE_USER8 155
322 #define LINKTYPE_USER9 156
323 #define LINKTYPE_USER10 157
324 #define LINKTYPE_USER11 158
325 #define LINKTYPE_USER12 159
326 #define LINKTYPE_USER13 160
327 #define LINKTYPE_USER14 161
328 #define LINKTYPE_USER15 162
331 * For future use with 802.11 captures - defined by AbsoluteValue
332 * Systems to store a number of bits of link-layer information
333 * including radio information:
335 * http://www.shaftnet.org/~pizza/software/capturefrm.txt
337 * but could and arguably should also be used by non-AVS Linux
338 * 802.11 drivers; that may happen in the future.
340 #define LINKTYPE_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */
343 * Juniper-private data link type, as per request from
344 * Hannes Gredler <hannes@juniper.net>. The corresponding
345 * DLT_s are used for passing on chassis-internal
346 * metainformation such as QOS profiles, etc..
348 #define LINKTYPE_JUNIPER_MONITOR 164
351 * Reserved for BACnet MS/TP.
353 #define LINKTYPE_BACNET_MS_TP 165
356 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
358 * This is used in some OSes to allow a kernel socket filter to distinguish
359 * between incoming and outgoing packets, on a socket intended to
360 * supply pppd with outgoing packets so it can do dial-on-demand and
361 * hangup-on-lack-of-demand; incoming packets are filtered out so they
362 * don't cause pppd to hold the connection up (you don't want random
363 * input packets such as port scans, packets from old lost connections,
364 * etc. to force the connection to stay up).
366 * The first byte of the PPP header (0xff03) is modified to accomodate
367 * the direction - 0x00 = IN, 0x01 = OUT.
369 #define LINKTYPE_PPP_PPPD 166
372 * Juniper-private data link type, as per request from
373 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used
374 * for passing on chassis-internal metainformation such as
375 * QOS profiles, cookies, etc..
377 #define LINKTYPE_JUNIPER_PPPOE 167
378 #define LINKTYPE_JUNIPER_PPPOE_ATM 168
380 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */
381 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */
382 #define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */
385 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
386 * monitoring equipment.
388 #define LINKTYPE_GCOM_T1E1 172
389 #define LINKTYPE_GCOM_SERIAL 173
392 * Juniper-private data link type, as per request from
393 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used
394 * for internal communication to Physical Interface Cards (PIC)
396 #define LINKTYPE_JUNIPER_PIC_PEER 174
399 * Link types requested by Gregor Maier <gregor@endace.com> of Endace
400 * Measurement Systems. They add an ERF header (see
401 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
402 * the link-layer header.
404 #define LINKTYPE_ERF_ETH 175 /* Ethernet */
405 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */
407 static struct linktype_map {
412 * These DLT_* codes have LINKTYPE_* codes with values identical
413 * to the values of the corresponding DLT_* code.
415 { DLT_NULL, LINKTYPE_NULL },
416 { DLT_EN10MB, LINKTYPE_ETHERNET },
417 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET },
418 { DLT_AX25, LINKTYPE_AX25 },
419 { DLT_PRONET, LINKTYPE_PRONET },
420 { DLT_CHAOS, LINKTYPE_CHAOS },
421 { DLT_IEEE802, LINKTYPE_TOKEN_RING },
422 { DLT_ARCNET, LINKTYPE_ARCNET },
423 { DLT_SLIP, LINKTYPE_SLIP },
424 { DLT_PPP, LINKTYPE_PPP },
425 { DLT_FDDI, LINKTYPE_FDDI },
428 * These DLT_* codes have different values on different
429 * platforms; we map them to LINKTYPE_* codes that
430 * have values that should never be equal to any DLT_*
434 /* BSD/OS Frame Relay */
435 { DLT_FR, LINKTYPE_FRELAY },
438 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL },
439 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 },
440 { DLT_RAW, LINKTYPE_RAW },
441 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS },
442 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS },
444 /* BSD/OS Cisco HDLC */
445 { DLT_C_HDLC, LINKTYPE_C_HDLC },
448 * These DLT_* codes are not on all platforms, but, so far,
449 * there don't appear to be any platforms that define
450 * other codes with those values; we map them to
451 * different LINKTYPE_* values anyway, just in case.
454 /* Linux ATM Classical IP */
455 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP },
457 /* NetBSD sync/async serial PPP (or Cisco HDLC) */
458 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC },
460 /* NetBSD PPP over Ethernet */
461 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER },
463 /* IEEE 802.11 wireless */
464 { DLT_IEEE802_11, LINKTYPE_IEEE802_11 },
467 { DLT_FRELAY, LINKTYPE_FRELAY },
469 /* OpenBSD loopback */
470 { DLT_LOOP, LINKTYPE_LOOP },
472 /* Linux cooked socket capture */
473 { DLT_LINUX_SLL, LINKTYPE_LINUX_SLL },
475 /* Apple LocalTalk hardware */
476 { DLT_LTALK, LINKTYPE_LTALK },
479 { DLT_ECONET, LINKTYPE_ECONET },
481 /* OpenBSD DLT_PFLOG */
482 { DLT_PFLOG, LINKTYPE_PFLOG },
484 /* For Cisco-internal use */
485 { DLT_CISCO_IOS, LINKTYPE_CISCO_IOS },
487 /* Prism II monitor-mode header plus 802.11 header */
488 { DLT_PRISM_HEADER, LINKTYPE_PRISM_HEADER },
490 /* FreeBSD Aironet driver stuff */
491 { DLT_AIRONET_HEADER, LINKTYPE_AIRONET_HEADER },
493 /* Siemens HiPath HDLC */
494 { DLT_HHDLC, LINKTYPE_HHDLC },
496 /* RFC 2625 IP-over-Fibre Channel */
497 { DLT_IP_OVER_FC, LINKTYPE_IP_OVER_FC },
500 { DLT_SUNATM, LINKTYPE_SUNATM },
503 { DLT_RIO, LINKTYPE_RIO },
506 { DLT_PCI_EXP, LINKTYPE_PCI_EXP },
508 /* Xilinx Aurora link layer */
509 { DLT_AURORA, LINKTYPE_AURORA },
511 /* 802.11 plus BSD radio header */
512 { DLT_IEEE802_11_RADIO, LINKTYPE_IEEE802_11_RADIO },
514 /* Tazmen Sniffer Protocol */
515 { DLT_TZSP, LINKTYPE_TZSP },
517 /* Arcnet with Linux-style link-layer headers */
518 { DLT_ARCNET_LINUX, LINKTYPE_ARCNET_LINUX },
520 /* Juniper-internal chassis encapsulation */
521 { DLT_JUNIPER_MLPPP, LINKTYPE_JUNIPER_MLPPP },
522 { DLT_JUNIPER_MLFR, LINKTYPE_JUNIPER_MLFR },
523 { DLT_JUNIPER_ES, LINKTYPE_JUNIPER_ES },
524 { DLT_JUNIPER_GGSN, LINKTYPE_JUNIPER_GGSN },
525 { DLT_JUNIPER_MFR, LINKTYPE_JUNIPER_MFR },
526 { DLT_JUNIPER_ATM2, LINKTYPE_JUNIPER_ATM2 },
527 { DLT_JUNIPER_SERVICES, LINKTYPE_JUNIPER_SERVICES },
528 { DLT_JUNIPER_ATM1, LINKTYPE_JUNIPER_ATM1 },
530 /* Apple IP-over-IEEE 1394 cooked header */
531 { DLT_APPLE_IP_OVER_IEEE1394, LINKTYPE_APPLE_IP_OVER_IEEE1394 },
533 /* DOCSIS MAC frames */
534 { DLT_DOCSIS, LINKTYPE_DOCSIS },
536 /* IrDA IrLAP packets + Linux-cooked header */
537 { DLT_LINUX_IRDA, LINKTYPE_LINUX_IRDA },
539 /* IBM SP and Next Federation switches */
540 { DLT_IBM_SP, LINKTYPE_IBM_SP },
541 { DLT_IBM_SN, LINKTYPE_IBM_SN },
543 /* 802.11 plus AVS radio header */
544 { DLT_IEEE802_11_RADIO_AVS, LINKTYPE_IEEE802_11_RADIO_AVS },
547 * Any platform that defines additional DLT_* codes should:
549 * request a LINKTYPE_* code and value from tcpdump.org,
552 * add, in their version of libpcap, an entry to map
553 * those DLT_* codes to the corresponding LINKTYPE_*
556 * redefine, in their "net/bpf.h", any DLT_* values
557 * that collide with the values used by their additional
558 * DLT_* codes, to remove those collisions (but without
559 * making them collide with any of the LINKTYPE_*
560 * values equal to 50 or above; they should also avoid
561 * defining DLT_* values that collide with those
562 * LINKTYPE_* values, either).
565 /* Juniper-internal chassis encapsulation */
566 { DLT_JUNIPER_MONITOR, LINKTYPE_JUNIPER_MONITOR },
569 { DLT_BACNET_MS_TP, LINKTYPE_BACNET_MS_TP },
571 /* PPP for pppd, with direction flag in the PPP header */
572 { DLT_PPP_PPPD, LINKTYPE_PPP_PPPD},
574 /* Juniper-internal chassis encapsulation */
575 { DLT_JUNIPER_PPPOE, LINKTYPE_JUNIPER_PPPOE },
576 { DLT_JUNIPER_PPPOE_ATM,LINKTYPE_JUNIPER_PPPOE_ATM },
579 { DLT_GPRS_LLC, LINKTYPE_GPRS_LLC },
581 /* Transparent Generic Framing Procedure (ITU-T G.7041/Y.1303) */
582 { DLT_GPF_T, LINKTYPE_GPF_T },
584 /* Framed Generic Framing Procedure (ITU-T G.7041/Y.1303) */
585 { DLT_GPF_F, LINKTYPE_GPF_F },
587 { DLT_GCOM_T1E1, LINKTYPE_GCOM_T1E1 },
588 { DLT_GCOM_SERIAL, LINKTYPE_GCOM_SERIAL },
590 /* Juniper-internal chassis encapsulation */
591 { DLT_JUNIPER_PIC_PEER, LINKTYPE_JUNIPER_PIC_PEER },
594 { DLT_ERF_ETH, LINKTYPE_ERF_ETH },
595 { DLT_ERF_POS, LINKTYPE_ERF_POS },
601 dlt_to_linktype(int dlt)
605 for (i = 0; map[i].dlt != -1; i++) {
606 if (map[i].dlt == dlt)
607 return (map[i].linktype);
611 * If we don't have a mapping for this DLT_ code, return an
612 * error; that means that the table above needs to have an
619 linktype_to_dlt(int linktype)
623 for (i = 0; map[i].linktype != -1; i++) {
624 if (map[i].linktype == linktype)
629 * If we don't have an entry for this link type, return
630 * the link type value; it may be a DLT_ value from an
631 * older version of libpcap.
637 sf_write_header(FILE *fp, int linktype, int thiszone, int snaplen)
639 struct pcap_file_header hdr;
641 hdr.magic = TCPDUMP_MAGIC;
642 hdr.version_major = PCAP_VERSION_MAJOR;
643 hdr.version_minor = PCAP_VERSION_MINOR;
645 hdr.thiszone = thiszone;
646 hdr.snaplen = snaplen;
648 hdr.linktype = linktype;
650 if (fwrite((char *)&hdr, sizeof(hdr), 1, fp) != 1)
657 swap_hdr(struct pcap_file_header *hp)
659 hp->version_major = SWAPSHORT(hp->version_major);
660 hp->version_minor = SWAPSHORT(hp->version_minor);
661 hp->thiszone = SWAPLONG(hp->thiszone);
662 hp->sigfigs = SWAPLONG(hp->sigfigs);
663 hp->snaplen = SWAPLONG(hp->snaplen);
664 hp->linktype = SWAPLONG(hp->linktype);
668 sf_getnonblock(pcap_t *p, char *errbuf)
671 * This is a savefile, not a live capture file, so never say
672 * it's in non-blocking mode.
678 sf_setnonblock(pcap_t *p, int nonblock, char *errbuf)
681 * This is a savefile, not a live capture file, so ignore
682 * requests to put it in non-blocking mode.
688 sf_stats(pcap_t *p, struct pcap_stat *ps)
690 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
691 "Statistics aren't available from savefiles");
696 sf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
698 strlcpy(p->errbuf, "Sending packets isn't supported on savefiles",
706 if (p->sf.rfile != stdin)
707 (void)fclose(p->sf.rfile);
708 if (p->sf.base != NULL)
713 pcap_open_offline(const char *fname, char *errbuf)
718 if (fname[0] == '-' && fname[1] == '\0')
721 #if !defined(WIN32) && !defined(MSDOS)
722 fp = fopen(fname, "r");
724 fp = fopen(fname, "rb");
727 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", fname,
728 pcap_strerror(errno));
732 p = pcap_fopen_offline(fp, errbuf);
741 pcap_fopen_offline(FILE *fp, char *errbuf)
744 struct pcap_file_header hdr;
749 p = (pcap_t *)malloc(sizeof(*p));
751 strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE);
755 memset((char *)p, 0, sizeof(*p));
757 amt_read = fread((char *)&hdr, 1, sizeof(hdr), fp);
758 if (amt_read != sizeof(hdr)) {
760 snprintf(errbuf, PCAP_ERRBUF_SIZE,
761 "error reading dump file: %s",
762 pcap_strerror(errno));
764 snprintf(errbuf, PCAP_ERRBUF_SIZE,
765 "truncated dump file; tried to read %lu file header bytes, only got %lu",
766 (unsigned long)sizeof(hdr),
767 (unsigned long)amt_read);
772 if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) {
773 magic = SWAPLONG(magic);
774 if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) {
775 snprintf(errbuf, PCAP_ERRBUF_SIZE,
776 "bad dump file format");
782 if (magic == KUZNETZOV_TCPDUMP_MAGIC) {
784 * XXX - the patch that's in some versions of libpcap
785 * changes the packet header but not the magic number,
786 * and some other versions with this magic number have
787 * some extra debugging information in the packet header;
788 * we'd have to use some hacks^H^H^H^H^Hheuristics to
789 * detect those variants.
791 * Ethereal does that, but it does so by trying to read
792 * the first two packets of the file with each of the
793 * record header formats. That currently means it seeks
794 * backwards and retries the reads, which doesn't work
795 * on pipes. We want to be able to read from a pipe, so
796 * that strategy won't work; we'd have to buffer some
797 * data ourselves and read from that buffer in order to
800 p->sf.hdrsize = sizeof(struct pcap_sf_patched_pkthdr);
802 p->sf.hdrsize = sizeof(struct pcap_sf_pkthdr);
803 if (hdr.version_major < PCAP_VERSION_MAJOR) {
804 snprintf(errbuf, PCAP_ERRBUF_SIZE, "archaic file format");
807 p->tzoff = hdr.thiszone;
808 p->snapshot = hdr.snaplen;
809 p->linktype = linktype_to_dlt(hdr.linktype);
812 p->bufsize = hdr.snaplen;
814 /* Allocate the space for pcap_pkthdr as well. It will be used by pcap_read_ex */
815 p->bufsize = hdr.snaplen+sizeof(struct pcap_pkthdr);
818 /* Align link header as required for proper data alignment */
819 /* XXX should handle all types */
820 switch (p->linktype) {
827 linklen = 13 + 8; /* fddi_header + llc */
837 p->bufsize = BPF_MAXBUFSIZE;
838 p->sf.base = (u_char *)malloc(p->bufsize + BPF_ALIGNMENT);
839 if (p->sf.base == NULL) {
840 strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE);
843 p->buffer = p->sf.base + BPF_ALIGNMENT - (linklen % BPF_ALIGNMENT);
844 p->sf.version_major = hdr.version_major;
845 p->sf.version_minor = hdr.version_minor;
847 /* Padding only needed for live capture fcode */
852 * We interchanged the caplen and len fields at version 2.3,
853 * in order to match the bpf header layout. But unfortunately
854 * some files were written with version 2.3 in their headers
855 * but without the interchanged fields.
857 * In addition, DG/UX tcpdump writes out files with a version
858 * number of 543.0, and with the caplen and len fields in the
861 switch (hdr.version_major) {
864 if (hdr.version_minor < 3)
865 p->sf.lengths_swapped = SWAPPED;
866 else if (hdr.version_minor == 3)
867 p->sf.lengths_swapped = MAYBE_SWAPPED;
869 p->sf.lengths_swapped = NOT_SWAPPED;
873 p->sf.lengths_swapped = SWAPPED;
877 p->sf.lengths_swapped = NOT_SWAPPED;
881 #if !defined(WIN32) && !defined(MSDOS)
883 * You can do "select()" and "poll()" on plain files on most
884 * platforms, and should be able to do so on pipes.
886 * You can't do "select()" on anything other than sockets in
887 * Windows, so, on Win32 systems, we don't have "selectable_fd".
889 p->selectable_fd = fileno(fp);
892 p->read_op = pcap_offline_read;
893 p->inject_op = sf_inject;
894 p->setfilter_op = install_bpf_program;
895 p->set_datalink_op = NULL; /* we don't support munging link-layer headers */
896 p->getnonblock_op = sf_getnonblock;
897 p->setnonblock_op = sf_setnonblock;
898 p->stats_op = sf_stats;
899 p->close_op = sf_close;
901 #if defined(WIN32) || defined(MSDOS)
903 * If we're reading from the standard input, put it in binary
904 * mode, as savefiles are binary files.
917 * Read sf_readfile and return the next packet. Return the header in hdr
918 * and the contents in buf. Return 0 on success, SFERR_EOF if there were
919 * no more packets, and SFERR_TRUNC if a partial packet was encountered.
922 sf_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char *buf, u_int buflen)
924 struct pcap_sf_patched_pkthdr sf_hdr;
925 FILE *fp = p->sf.rfile;
930 * Read the packet header; the structure we use as a buffer
931 * is the longer structure for files generated by the patched
932 * libpcap, but if the file has the magic number for an
933 * unpatched libpcap we only read as many bytes as the regular
936 amt_read = fread(&sf_hdr, 1, p->sf.hdrsize, fp);
937 if (amt_read != p->sf.hdrsize) {
939 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
940 "error reading dump file: %s",
941 pcap_strerror(errno));
945 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
946 "truncated dump file; tried to read %d header bytes, only got %lu",
947 p->sf.hdrsize, (unsigned long)amt_read);
956 /* these were written in opposite byte order */
957 hdr->caplen = SWAPLONG(sf_hdr.caplen);
958 hdr->len = SWAPLONG(sf_hdr.len);
959 hdr->ts.tv_sec = SWAPLONG(sf_hdr.ts.tv_sec);
960 hdr->ts.tv_usec = SWAPLONG(sf_hdr.ts.tv_usec);
962 hdr->caplen = sf_hdr.caplen;
963 hdr->len = sf_hdr.len;
964 hdr->ts.tv_sec = sf_hdr.ts.tv_sec;
965 hdr->ts.tv_usec = sf_hdr.ts.tv_usec;
967 /* Swap the caplen and len fields, if necessary. */
968 switch (p->sf.lengths_swapped) {
974 if (hdr->caplen <= hdr->len) {
976 * The captured length is <= the actual length,
977 * so presumably they weren't swapped.
985 hdr->caplen = hdr->len;
990 if (hdr->caplen > buflen) {
992 * This can happen due to Solaris 2.3 systems tripping
993 * over the BUFMOD problem and not setting the snapshot
994 * correctly in the savefile header. If the caplen isn't
995 * grossly wrong, try to salvage.
997 static u_char *tp = NULL;
998 static size_t tsize = 0;
1000 if (hdr->caplen > 65535) {
1001 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1002 "bogus savefile header");
1006 if (tsize < hdr->caplen) {
1007 tsize = ((hdr->caplen + 1023) / 1024) * 1024;
1010 tp = (u_char *)malloc(tsize);
1013 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1014 "BUFMOD hack malloc");
1018 amt_read = fread((char *)tp, 1, hdr->caplen, fp);
1019 if (amt_read != hdr->caplen) {
1021 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1022 "error reading dump file: %s",
1023 pcap_strerror(errno));
1025 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1026 "truncated dump file; tried to read %u captured bytes, only got %lu",
1027 hdr->caplen, (unsigned long)amt_read);
1032 * We can only keep up to buflen bytes. Since caplen > buflen
1033 * is exactly how we got here, we know we can only keep the
1034 * first buflen bytes and must drop the remainder. Adjust
1035 * caplen accordingly, so we don't get confused later as
1036 * to how many bytes we have to play with.
1038 hdr->caplen = buflen;
1039 memcpy((char *)buf, (char *)tp, buflen);
1042 /* read the packet itself */
1043 amt_read = fread((char *)buf, 1, hdr->caplen, fp);
1044 if (amt_read != hdr->caplen) {
1046 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1047 "error reading dump file: %s",
1048 pcap_strerror(errno));
1050 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1051 "truncated dump file; tried to read %u captured bytes, only got %lu",
1052 hdr->caplen, (unsigned long)amt_read);
1061 * Print out packets stored in the file initialized by sf_read_init().
1062 * If cnt > 0, return after 'cnt' packets, otherwise continue until eof.
1065 pcap_offline_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
1067 struct bpf_insn *fcode;
1071 while (status == 0) {
1072 struct pcap_pkthdr h;
1075 * Has "pcap_breakloop()" been called?
1076 * If so, return immediately - if we haven't read any
1077 * packets, clear the flag and return -2 to indicate
1078 * that we were told to break out of the loop, otherwise
1079 * leave the flag set, so that the *next* call will break
1080 * out of the loop without having read any packets, and
1081 * return the number of packets we've processed so far.
1083 if (p->break_loop) {
1091 status = sf_next_packet(p, &h, p->buffer, p->bufsize);
1098 if ((fcode = p->fcode.bf_insns) == NULL ||
1099 bpf_filter(fcode, p->buffer, h.len, h.caplen)) {
1100 (*callback)(user, &h, p->buffer);
1101 if (++n >= cnt && cnt > 0)
1105 /*XXX this breaks semantics tcpslice expects */
1110 * Output a packet to the initialized dump file.
1113 pcap_dump(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1116 struct pcap_sf_pkthdr sf_hdr;
1119 sf_hdr.ts.tv_sec = h->ts.tv_sec;
1120 sf_hdr.ts.tv_usec = h->ts.tv_usec;
1121 sf_hdr.caplen = h->caplen;
1122 sf_hdr.len = h->len;
1123 /* XXX we should check the return status */
1124 (void)fwrite(&sf_hdr, sizeof(sf_hdr), 1, f);
1125 (void)fwrite((char *)sp, h->caplen, 1, f);
1128 static pcap_dumper_t *
1129 pcap_setup_dump(pcap_t *p, int linktype, FILE *f, const char *fname)
1132 #if defined(WIN32) || defined(MSDOS)
1134 * If we're writing to the standard output, put it in binary
1135 * mode, as savefiles are binary files.
1137 * Otherwise, we turn off buffering.
1138 * XXX - why? And why not on the standard output?
1145 if (sf_write_header(f, linktype, p->tzoff, p->snapshot) == -1) {
1146 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't write to %s: %s",
1147 fname, pcap_strerror(errno));
1152 return ((pcap_dumper_t *)f);
1156 * Initialize so that sf_write() will output to the file named 'fname'.
1159 pcap_dump_open(pcap_t *p, const char *fname)
1164 linktype = dlt_to_linktype(p->linktype);
1165 if (linktype == -1) {
1166 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1167 "%s: link-layer type %d isn't supported in savefiles",
1172 if (fname[0] == '-' && fname[1] == '\0') {
1174 fname = "standard output";
1176 #if !defined(WIN32) && !defined(MSDOS)
1177 f = fopen(fname, "w");
1179 f = fopen(fname, "wb");
1182 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
1183 fname, pcap_strerror(errno));
1187 return (pcap_setup_dump(p, linktype, f, fname));
1191 * Initialize so that sf_write() will output to the given stream.
1194 pcap_dump_fopen(pcap_t *p, FILE *f)
1198 linktype = dlt_to_linktype(p->linktype);
1199 if (linktype == -1) {
1200 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1201 "stream: link-layer type %d isn't supported in savefiles",
1206 return (pcap_setup_dump(p, linktype, f, "stream"));
1210 pcap_dump_file(pcap_dumper_t *p)
1216 pcap_dump_flush(pcap_dumper_t *p)
1219 if (fflush((FILE *)p) == EOF)
1226 pcap_dump_close(pcap_dumper_t *p)
1230 if (ferror((FILE *)p))
1232 /* XXX should check return from fclose() too */
1234 (void)fclose((FILE *)p);