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 1.168.2.10 2008-10-06 15:38:39 gianluca Exp $ (LBL)";
49 #ifdef HAVE_OS_PROTO_H
54 * Standard libpcap format.
56 #define TCPDUMP_MAGIC 0xa1b2c3d4
59 * Alexey Kuznetzov's modified libpcap format.
61 #define KUZNETZOV_TCPDUMP_MAGIC 0xa1b2cd34
64 * Reserved for Francisco Mesquita <francisco.mesquita@radiomovel.pt>
65 * for another modified format.
67 #define FMESQUITA_TCPDUMP_MAGIC 0xa1b234cd
70 * Navtel Communcations' format, with nanosecond timestamps,
71 * as per a request from Dumas Hwang <dumas.hwang@navtelcom.com>.
73 #define NAVTEL_TCPDUMP_MAGIC 0xa12b3c4d
76 * Normal libpcap format, except for seconds/nanoseconds timestamps,
77 * as per a request by Ulf Lamping <ulf.lamping@web.de>
79 #define NSEC_TCPDUMP_MAGIC 0xa1b23c4d
82 * We use the "receiver-makes-right" approach to byte order,
83 * because time is at a premium when we are writing the file.
84 * In other words, the pcap_file_header and pcap_pkthdr,
85 * records are written in host byte order.
86 * Note that the bytes of packet data are written out in the order in
87 * which they were received, so multi-byte fields in packets are not
88 * written in host byte order, they're written in whatever order the
89 * sending machine put them in.
91 * ntoh[ls] aren't sufficient because we might need to swap on a big-endian
92 * machine (if the file was written in little-end order).
95 ((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
96 #define SWAPSHORT(y) \
97 ( (((y)&0xff)<<8) | ((u_short)((y)&0xff00)>>8) )
100 #define SFERR_BADVERSION 2
102 #define SFERR_EOF 4 /* not really an error, just a status */
105 * Setting O_BINARY on DOS/Windows is a bit tricky
108 #define SET_BINMODE(f) _setmode(_fileno(f), _O_BINARY)
110 #if defined(__HIGHC__)
111 #define SET_BINMODE(f) setmode(f, O_BINARY)
113 #define SET_BINMODE(f) setmode(fileno(f), O_BINARY)
118 * We don't write DLT_* values to the capture file header, because
119 * they're not the same on all platforms.
121 * Unfortunately, the various flavors of BSD have not always used the same
122 * numerical values for the same data types, and various patches to
123 * libpcap for non-BSD OSes have added their own DLT_* codes for link
124 * layer encapsulation types seen on those OSes, and those codes have had,
125 * in some cases, values that were also used, on other platforms, for other
126 * link layer encapsulation types.
128 * This means that capture files of a type whose numerical DLT_* code
129 * means different things on different BSDs, or with different versions
130 * of libpcap, can't always be read on systems other than those like
131 * the one running on the machine on which the capture was made.
133 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes
134 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_*
135 * codes to DLT_* codes when reading a savefile header.
137 * For those DLT_* codes that have, as far as we know, the same values on
138 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as
139 * DLT_xxx; that way, captures of those types can still be read by
140 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and
141 * captures of those types written by versions of libpcap that map DLT_
142 * values to LINKTYPE_ values can still be read by older versions
145 * The other LINKTYPE_* codes are given values starting at 100, in the
146 * hopes that no DLT_* code will be given one of those values.
148 * In order to ensure that a given LINKTYPE_* code's value will refer to
149 * the same encapsulation type on all platforms, you should not allocate
150 * a new LINKTYPE_* value without consulting
151 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will
152 * allocate a value for you, and will not subsequently allocate it to
153 * anybody else; that value will be added to the "pcap.h" in the
154 * tcpdump.org CVS repository, so that a future libpcap release will
157 * You should, if possible, also contribute patches to libpcap and tcpdump
158 * to handle the new encapsulation type, so that they can also be checked
159 * into the tcpdump.org CVS repository and so that they will appear in
160 * future libpcap and tcpdump releases.
162 * Do *NOT* assume that any values after the largest value in this file
163 * are available; you might not have the most up-to-date version of this
164 * file, and new values after that one might have been assigned. Also,
165 * do *NOT* use any values below 100 - those might already have been
166 * taken by one (or more!) organizations.
168 #define LINKTYPE_NULL DLT_NULL
169 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */
170 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */
171 #define LINKTYPE_AX25 DLT_AX25
172 #define LINKTYPE_PRONET DLT_PRONET
173 #define LINKTYPE_CHAOS DLT_CHAOS
174 #define LINKTYPE_TOKEN_RING DLT_IEEE802 /* DLT_IEEE802 is used for Token Ring */
175 #define LINKTYPE_ARCNET DLT_ARCNET /* BSD-style headers */
176 #define LINKTYPE_SLIP DLT_SLIP
177 #define LINKTYPE_PPP DLT_PPP
178 #define LINKTYPE_FDDI DLT_FDDI
181 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662
182 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol
183 * field) at the beginning of the packet.
185 * This is for use when there is always such a header; the address field
186 * might be 0xff, for regular PPP, or it might be an address field for Cisco
187 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco
188 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL.
190 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that
191 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL
192 * captures will be written out with a link type that NetBSD's tcpdump
195 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */
197 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */
199 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */
201 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */
202 #define LINKTYPE_RAW 101 /* raw IP */
203 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */
204 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */
205 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */
206 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */
207 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */
208 #define LINKTYPE_FRELAY 107 /* Frame Relay */
209 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */
210 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */
213 * These three types are reserved for future use.
215 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */
216 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */
217 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */
219 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */
220 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */
221 #define LINKTYPE_ECONET 115 /* Acorn Econet */
224 * Reserved for use with OpenBSD ipfilter.
226 #define LINKTYPE_IPFILTER 116
228 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */
229 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */
230 #define LINKTYPE_PRISM_HEADER 119 /* 802.11+Prism II monitor mode */
231 #define LINKTYPE_AIRONET_HEADER 120 /* FreeBSD Aironet driver stuff */
234 * Reserved for Siemens HiPath HDLC.
236 #define LINKTYPE_HHDLC 121
238 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */
239 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */
242 * Reserved as per request from Kent Dahlgren <kent@praesum.com>
245 #define LINKTYPE_RIO 124 /* RapidIO */
246 #define LINKTYPE_PCI_EXP 125 /* PCI Express */
247 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */
249 #define LINKTYPE_IEEE802_11_RADIO 127 /* 802.11 plus BSD radio header */
252 * Reserved for the TZSP encapsulation, as per request from
253 * Chris Waters <chris.waters@networkchemistry.com>
254 * TZSP is a generic encapsulation for any other link type,
255 * which includes a means to include meta-information
256 * with the packet, e.g. signal strength and channel
257 * for 802.11 packets.
259 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */
261 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */
264 * Juniper-private data link types, as per request from
265 * Hannes Gredler <hannes@juniper.net>. The corresponding
266 * DLT_s are used for passing on chassis-internal
267 * metainformation such as QOS profiles, etc..
269 #define LINKTYPE_JUNIPER_MLPPP 130
270 #define LINKTYPE_JUNIPER_MLFR 131
271 #define LINKTYPE_JUNIPER_ES 132
272 #define LINKTYPE_JUNIPER_GGSN 133
273 #define LINKTYPE_JUNIPER_MFR 134
274 #define LINKTYPE_JUNIPER_ATM2 135
275 #define LINKTYPE_JUNIPER_SERVICES 136
276 #define LINKTYPE_JUNIPER_ATM1 137
278 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */
280 #define LINKTYPE_MTP2_WITH_PHDR 139
281 #define LINKTYPE_MTP2 140
282 #define LINKTYPE_MTP3 141
283 #define LINKTYPE_SCCP 142
285 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */
287 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */
290 * Reserved for IBM SP switch and IBM Next Federation switch.
292 #define LINKTYPE_IBM_SP 145
293 #define LINKTYPE_IBM_SN 146
296 * Reserved for private use. If you have some link-layer header type
297 * that you want to use within your organization, with the capture files
298 * using that link-layer header type not ever be sent outside your
299 * organization, you can use these values.
301 * No libpcap release will use these for any purpose, nor will any
302 * tcpdump release use them, either.
304 * Do *NOT* use these in capture files that you expect anybody not using
305 * your private versions of capture-file-reading tools to read; in
306 * particular, do *NOT* use them in products, otherwise you may find that
307 * people won't be able to use tcpdump, or snort, or Ethereal, or... to
308 * read capture files from your firewall/intrusion detection/traffic
309 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value,
310 * and you may also find that the developers of those applications will
311 * not accept patches to let them read those files.
313 * Also, do not use them if somebody might send you a capture using them
314 * for *their* private type and tools using them for *your* private type
315 * would have to read them.
317 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a
318 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use
319 * the type you're given.
321 #define LINKTYPE_USER0 147
322 #define LINKTYPE_USER1 148
323 #define LINKTYPE_USER2 149
324 #define LINKTYPE_USER3 150
325 #define LINKTYPE_USER4 151
326 #define LINKTYPE_USER5 152
327 #define LINKTYPE_USER6 153
328 #define LINKTYPE_USER7 154
329 #define LINKTYPE_USER8 155
330 #define LINKTYPE_USER9 156
331 #define LINKTYPE_USER10 157
332 #define LINKTYPE_USER11 158
333 #define LINKTYPE_USER12 159
334 #define LINKTYPE_USER13 160
335 #define LINKTYPE_USER14 161
336 #define LINKTYPE_USER15 162
339 * For future use with 802.11 captures - defined by AbsoluteValue
340 * Systems to store a number of bits of link-layer information
341 * including radio information:
343 * http://www.shaftnet.org/~pizza/software/capturefrm.txt
345 * but could and arguably should also be used by non-AVS Linux
346 * 802.11 drivers; that may happen in the future.
348 #define LINKTYPE_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */
351 * Juniper-private data link type, as per request from
352 * Hannes Gredler <hannes@juniper.net>. The corresponding
353 * DLT_s are used for passing on chassis-internal
354 * metainformation such as QOS profiles, etc..
356 #define LINKTYPE_JUNIPER_MONITOR 164
359 * Reserved for BACnet MS/TP.
361 #define LINKTYPE_BACNET_MS_TP 165
364 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
366 * This is used in some OSes to allow a kernel socket filter to distinguish
367 * between incoming and outgoing packets, on a socket intended to
368 * supply pppd with outgoing packets so it can do dial-on-demand and
369 * hangup-on-lack-of-demand; incoming packets are filtered out so they
370 * don't cause pppd to hold the connection up (you don't want random
371 * input packets such as port scans, packets from old lost connections,
372 * etc. to force the connection to stay up).
374 * The first byte of the PPP header (0xff03) is modified to accomodate
375 * the direction - 0x00 = IN, 0x01 = OUT.
377 #define LINKTYPE_PPP_PPPD 166
380 * Juniper-private data link type, as per request from
381 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used
382 * for passing on chassis-internal metainformation such as
383 * QOS profiles, cookies, etc..
385 #define LINKTYPE_JUNIPER_PPPOE 167
386 #define LINKTYPE_JUNIPER_PPPOE_ATM 168
388 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */
389 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */
390 #define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */
393 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
394 * monitoring equipment.
396 #define LINKTYPE_GCOM_T1E1 172
397 #define LINKTYPE_GCOM_SERIAL 173
400 * Juniper-private data link type, as per request from
401 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used
402 * for internal communication to Physical Interface Cards (PIC)
404 #define LINKTYPE_JUNIPER_PIC_PEER 174
407 * Link types requested by Gregor Maier <gregor@endace.com> of Endace
408 * Measurement Systems. They add an ERF header (see
409 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
410 * the link-layer header.
412 #define LINKTYPE_ERF_ETH 175 /* Ethernet */
413 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */
416 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD
417 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header
418 * includes additional information before the LAPD header, so it's
419 * not necessarily a generic LAPD header.
421 #define LINKTYPE_LINUX_LAPD 177
424 * Juniper-private data link type, as per request from
425 * Hannes Gredler <hannes@juniper.net>.
426 * The Link Types are used for prepending meta-information
427 * like interface index, interface name
428 * before standard Ethernet, PPP, Frelay & C-HDLC Frames
430 #define LINKTYPE_JUNIPER_ETHER 178
431 #define LINKTYPE_JUNIPER_PPP 179
432 #define LINKTYPE_JUNIPER_FRELAY 180
433 #define LINKTYPE_JUNIPER_CHDLC 181
436 * Multi Link Frame Relay (FRF.16)
438 #define LINKTYPE_MFR 182
441 * Juniper-private data link type, as per request from
442 * Hannes Gredler <hannes@juniper.net>.
443 * The DLT_ is used for internal communication with a
444 * voice Adapter Card (PIC)
446 #define LINKTYPE_JUNIPER_VP 183
450 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
451 * Every frame contains a 32bit A429 label.
452 * More documentation on Arinc 429 can be found at
453 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf
455 #define LINKTYPE_A429 184
458 * Arinc 653 Interpartition Communication messages.
459 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
460 * Please refer to the A653-1 standard for more information.
462 #define LINKTYPE_A653_ICM 185
465 * USB packets, beginning with a USB setup header; requested by
466 * Paolo Abeni <paolo.abeni@email.it>.
468 #define LINKTYPE_USB 186
471 * Bluetooth HCI UART transport layer (part H:4); requested by
474 #define LINKTYPE_BLUETOOTH_HCI_H4 187
477 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz
478 * <cruz_petagay@bah.com>.
480 #define LINKTYPE_IEEE802_16_MAC_CPS 188
483 * USB packets, beginning with a Linux USB header; requested by
484 * Paolo Abeni <paolo.abeni@email.it>.
486 #define LINKTYPE_USB_LINUX 189
489 * Controller Area Network (CAN) v. 2.0B packets.
490 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
491 * Used to dump CAN packets coming from a CAN Vector board.
492 * More documentation on the CAN v2.0B frames can be found at
493 * http://www.can-cia.org/downloads/?269
495 #define LINKTYPE_CAN20B 190
498 * IEEE 802.15.4, with address fields padded, as is done by Linux
499 * drivers; requested by Juergen Schimmer.
501 #define LINKTYPE_IEEE802_15_4_LINUX 191
504 * Per Packet Information encapsulated packets.
505 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
507 #define LINKTYPE_PPI 192
510 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header;
511 * requested by Charles Clancy.
513 #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193
516 * Juniper-private data link type, as per request from
517 * Hannes Gredler <hannes@juniper.net>.
518 * The DLT_ is used for internal communication with a
519 * integrated service module (ISM).
521 #define LINKTYPE_JUNIPER_ISM 194
524 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
525 * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>.
527 #define LINKTYPE_IEEE802_15_4 195
530 * Various link-layer types, with a pseudo-header, for SITA
531 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com).
533 #define LINKTYPE_SITA 196
536 * Various link-layer types, with a pseudo-header, for Endace DAG cards;
537 * encapsulates Endace ERF records. Requested by Stephen Donnelly
538 * <stephen@endace.com>.
540 #define LINKTYPE_ERF 197
543 * Special header prepended to Ethernet packets when capturing from a
544 * u10 Networks board. Requested by Phil Mulholland
545 * <phil@u10networks.com>.
547 #define LINKTYPE_RAIF1 198
550 * IPMB packet for IPMI, beginning with the I2C slave address, followed
551 * by the netFn and LUN, etc.. Requested by Chanthy Toeung
552 * <chanthy.toeung@ca.kontron.com>.
554 #define LINKTYPE_IPMB 199
557 * Juniper-private data link type, as per request from
558 * Hannes Gredler <hannes@juniper.net>.
559 * The DLT_ is used for capturing data on a secure tunnel interface.
561 #define LINKTYPE_JUNIPER_ST 200
564 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header
565 * that includes direction information; requested by Paolo Abeni.
567 #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201
570 * AX.25 packet with a 1-byte KISS header; see
572 * http://www.ax25.net/kiss.htm
574 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>.
576 #define LINKTYPE_AX25_KISS 202
579 * LAPD packets from an ISDN channel, starting with the address field,
580 * with no pseudo-header.
581 * Requested by Varuna De Silva <varunax@gmail.com>.
583 #define LINKTYPE_LAPD 203
586 * Variants of various link-layer headers, with a one-byte direction
587 * pseudo-header prepended - zero means "received by this host",
588 * non-zero (any non-zero value) means "sent by this host" - as per
589 * Will Barker <w.barker@zen.co.uk>.
591 #define LINKTYPE_PPP_WITH_DIR 204 /* PPP */
592 #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */
593 #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */
594 #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */
597 * 208 is reserved for an as-yet-unspecified proprietary link-layer
598 * type, as requested by Will Barker.
602 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman
603 * <avn@pigeonpoint.com>.
605 #define LINKTYPE_IPMB_LINUX 209
608 * FlexRay automotive bus - http://www.flexray.com/ - as requested
609 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
611 #define LINKTYPE_FLEXRAY 210
614 * Media Oriented Systems Transport (MOST) bus for multimedia
615 * transport - http://www.mostcooperation.com/ - as requested
616 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
618 #define LINKTYPE_MOST 211
621 * Local Interconnect Network (LIN) bus for vehicle networks -
622 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber
623 * <hannes.kaelber@x2e.de>.
625 #define LINKTYPE_LIN 212
628 * X2E-private data link type used for serial line capture,
629 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
631 #define LINKTYPE_X2E_SERIAL 213
634 * X2E-private data link type used for the Xoraya data logger
635 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
637 #define LINKTYPE_X2E_XORAYA 214
640 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
641 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets
642 * of 0 as preamble, one octet of SFD, one octet of frame length+
643 * reserved bit, and then the MAC-layer data, starting with the
644 * frame control field).
646 * Requested by Max Filippov <jcmvbkbc@gmail.com>.
648 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215
651 static struct linktype_map {
656 * These DLT_* codes have LINKTYPE_* codes with values identical
657 * to the values of the corresponding DLT_* code.
659 { DLT_NULL, LINKTYPE_NULL },
660 { DLT_EN10MB, LINKTYPE_ETHERNET },
661 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET },
662 { DLT_AX25, LINKTYPE_AX25 },
663 { DLT_PRONET, LINKTYPE_PRONET },
664 { DLT_CHAOS, LINKTYPE_CHAOS },
665 { DLT_IEEE802, LINKTYPE_TOKEN_RING },
666 { DLT_ARCNET, LINKTYPE_ARCNET },
667 { DLT_SLIP, LINKTYPE_SLIP },
668 { DLT_PPP, LINKTYPE_PPP },
669 { DLT_FDDI, LINKTYPE_FDDI },
672 * These DLT_* codes have different values on different
673 * platforms; we map them to LINKTYPE_* codes that
674 * have values that should never be equal to any DLT_*
678 /* BSD/OS Frame Relay */
679 { DLT_FR, LINKTYPE_FRELAY },
682 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL },
683 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 },
684 { DLT_RAW, LINKTYPE_RAW },
685 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS },
686 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS },
688 /* BSD/OS Cisco HDLC */
689 { DLT_C_HDLC, LINKTYPE_C_HDLC },
692 * These DLT_* codes are not on all platforms, but, so far,
693 * there don't appear to be any platforms that define
694 * other codes with those values; we map them to
695 * different LINKTYPE_* values anyway, just in case.
698 /* Linux ATM Classical IP */
699 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP },
701 /* NetBSD sync/async serial PPP (or Cisco HDLC) */
702 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC },
704 /* NetBSD PPP over Ethernet */
705 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER },
707 /* IEEE 802.11 wireless */
708 { DLT_IEEE802_11, LINKTYPE_IEEE802_11 },
711 { DLT_FRELAY, LINKTYPE_FRELAY },
713 /* OpenBSD loopback */
714 { DLT_LOOP, LINKTYPE_LOOP },
716 /* Linux cooked socket capture */
717 { DLT_LINUX_SLL, LINKTYPE_LINUX_SLL },
719 /* Apple LocalTalk hardware */
720 { DLT_LTALK, LINKTYPE_LTALK },
723 { DLT_ECONET, LINKTYPE_ECONET },
725 /* OpenBSD DLT_PFLOG */
726 { DLT_PFLOG, LINKTYPE_PFLOG },
728 /* For Cisco-internal use */
729 { DLT_CISCO_IOS, LINKTYPE_CISCO_IOS },
731 /* Prism II monitor-mode header plus 802.11 header */
732 { DLT_PRISM_HEADER, LINKTYPE_PRISM_HEADER },
734 /* FreeBSD Aironet driver stuff */
735 { DLT_AIRONET_HEADER, LINKTYPE_AIRONET_HEADER },
737 /* Siemens HiPath HDLC */
738 { DLT_HHDLC, LINKTYPE_HHDLC },
740 /* RFC 2625 IP-over-Fibre Channel */
741 { DLT_IP_OVER_FC, LINKTYPE_IP_OVER_FC },
744 { DLT_SUNATM, LINKTYPE_SUNATM },
747 { DLT_RIO, LINKTYPE_RIO },
750 { DLT_PCI_EXP, LINKTYPE_PCI_EXP },
752 /* Xilinx Aurora link layer */
753 { DLT_AURORA, LINKTYPE_AURORA },
755 /* 802.11 plus BSD radio header */
756 { DLT_IEEE802_11_RADIO, LINKTYPE_IEEE802_11_RADIO },
758 /* Tazmen Sniffer Protocol */
759 { DLT_TZSP, LINKTYPE_TZSP },
761 /* Arcnet with Linux-style link-layer headers */
762 { DLT_ARCNET_LINUX, LINKTYPE_ARCNET_LINUX },
764 /* Juniper-internal chassis encapsulation */
765 { DLT_JUNIPER_MLPPP, LINKTYPE_JUNIPER_MLPPP },
766 { DLT_JUNIPER_MLFR, LINKTYPE_JUNIPER_MLFR },
767 { DLT_JUNIPER_ES, LINKTYPE_JUNIPER_ES },
768 { DLT_JUNIPER_GGSN, LINKTYPE_JUNIPER_GGSN },
769 { DLT_JUNIPER_MFR, LINKTYPE_JUNIPER_MFR },
770 { DLT_JUNIPER_ATM2, LINKTYPE_JUNIPER_ATM2 },
771 { DLT_JUNIPER_SERVICES, LINKTYPE_JUNIPER_SERVICES },
772 { DLT_JUNIPER_ATM1, LINKTYPE_JUNIPER_ATM1 },
774 /* Apple IP-over-IEEE 1394 cooked header */
775 { DLT_APPLE_IP_OVER_IEEE1394, LINKTYPE_APPLE_IP_OVER_IEEE1394 },
778 { DLT_MTP2_WITH_PHDR, LINKTYPE_MTP2_WITH_PHDR },
779 { DLT_MTP2, LINKTYPE_MTP2 },
780 { DLT_MTP3, LINKTYPE_MTP3 },
781 { DLT_SCCP, LINKTYPE_SCCP },
783 /* DOCSIS MAC frames */
784 { DLT_DOCSIS, LINKTYPE_DOCSIS },
786 /* IrDA IrLAP packets + Linux-cooked header */
787 { DLT_LINUX_IRDA, LINKTYPE_LINUX_IRDA },
789 /* IBM SP and Next Federation switches */
790 { DLT_IBM_SP, LINKTYPE_IBM_SP },
791 { DLT_IBM_SN, LINKTYPE_IBM_SN },
793 /* 802.11 plus AVS radio header */
794 { DLT_IEEE802_11_RADIO_AVS, LINKTYPE_IEEE802_11_RADIO_AVS },
797 * Any platform that defines additional DLT_* codes should:
799 * request a LINKTYPE_* code and value from tcpdump.org,
802 * add, in their version of libpcap, an entry to map
803 * those DLT_* codes to the corresponding LINKTYPE_*
806 * redefine, in their "net/bpf.h", any DLT_* values
807 * that collide with the values used by their additional
808 * DLT_* codes, to remove those collisions (but without
809 * making them collide with any of the LINKTYPE_*
810 * values equal to 50 or above; they should also avoid
811 * defining DLT_* values that collide with those
812 * LINKTYPE_* values, either).
815 /* Juniper-internal chassis encapsulation */
816 { DLT_JUNIPER_MONITOR, LINKTYPE_JUNIPER_MONITOR },
819 { DLT_BACNET_MS_TP, LINKTYPE_BACNET_MS_TP },
821 /* PPP for pppd, with direction flag in the PPP header */
822 { DLT_PPP_PPPD, LINKTYPE_PPP_PPPD},
824 /* Juniper-internal chassis encapsulation */
825 { DLT_JUNIPER_PPPOE, LINKTYPE_JUNIPER_PPPOE },
826 { DLT_JUNIPER_PPPOE_ATM,LINKTYPE_JUNIPER_PPPOE_ATM },
829 { DLT_GPRS_LLC, LINKTYPE_GPRS_LLC },
831 /* Transparent Generic Framing Procedure (ITU-T G.7041/Y.1303) */
832 { DLT_GPF_T, LINKTYPE_GPF_T },
834 /* Framed Generic Framing Procedure (ITU-T G.7041/Y.1303) */
835 { DLT_GPF_F, LINKTYPE_GPF_F },
837 { DLT_GCOM_T1E1, LINKTYPE_GCOM_T1E1 },
838 { DLT_GCOM_SERIAL, LINKTYPE_GCOM_SERIAL },
840 /* Juniper-internal chassis encapsulation */
841 { DLT_JUNIPER_PIC_PEER, LINKTYPE_JUNIPER_PIC_PEER },
844 { DLT_ERF_ETH, LINKTYPE_ERF_ETH },
845 { DLT_ERF_POS, LINKTYPE_ERF_POS },
848 { DLT_LINUX_LAPD, LINKTYPE_LINUX_LAPD },
850 /* Juniper meta-information before Ether, PPP, Frame Relay, C-HDLC Frames */
851 { DLT_JUNIPER_ETHER, LINKTYPE_JUNIPER_ETHER },
852 { DLT_JUNIPER_PPP, LINKTYPE_JUNIPER_PPP },
853 { DLT_JUNIPER_FRELAY, LINKTYPE_JUNIPER_FRELAY },
854 { DLT_JUNIPER_CHDLC, LINKTYPE_JUNIPER_CHDLC },
856 /* Multi Link Frame Relay (FRF.16) */
857 { DLT_MFR, LINKTYPE_MFR },
859 /* Juniper Voice PIC */
860 { DLT_JUNIPER_VP, LINKTYPE_JUNIPER_VP },
862 /* Controller Area Network (CAN) v2.0B */
863 { DLT_A429, LINKTYPE_A429 },
865 /* Arinc 653 Interpartition Communication messages */
866 { DLT_A653_ICM, LINKTYPE_A653_ICM },
869 { DLT_USB, LINKTYPE_USB },
871 /* Bluetooth HCI UART transport layer */
872 { DLT_BLUETOOTH_HCI_H4, LINKTYPE_BLUETOOTH_HCI_H4 },
874 /* IEEE 802.16 MAC Common Part Sublayer */
875 { DLT_IEEE802_16_MAC_CPS, LINKTYPE_IEEE802_16_MAC_CPS },
877 /* USB with Linux header */
878 { DLT_USB_LINUX, LINKTYPE_USB_LINUX },
880 /* Controller Area Network (CAN) v2.0B */
881 { DLT_CAN20B, LINKTYPE_CAN20B },
883 /* IEEE 802.15.4 with address fields padded */
884 { DLT_IEEE802_15_4_LINUX, LINKTYPE_IEEE802_15_4_LINUX },
886 /* Per Packet Information encapsulated packets */
887 { DLT_PPI, LINKTYPE_PPI },
889 /* IEEE 802.16 MAC Common Part Sublayer plus radiotap header */
890 { DLT_IEEE802_16_MAC_CPS_RADIO, LINKTYPE_IEEE802_16_MAC_CPS_RADIO },
892 /* Juniper Voice ISM */
893 { DLT_JUNIPER_ISM, LINKTYPE_JUNIPER_ISM },
895 /* IEEE 802.15.4 exactly as it appears in the spec */
896 { DLT_IEEE802_15_4, LINKTYPE_IEEE802_15_4 },
898 /* Various link-layer types for SITA */
899 { DLT_SITA, LINKTYPE_SITA },
901 /* Various link-layer types for Endace */
902 { DLT_ERF, LINKTYPE_ERF },
904 /* Special header for u10 Networks boards */
905 { DLT_RAIF1, LINKTYPE_RAIF1 },
908 { DLT_IPMB, LINKTYPE_IPMB },
911 { DLT_ENC, LINKTYPE_ENC },
913 /* Juniper Secure Tunnel */
914 { DLT_JUNIPER_ST, LINKTYPE_JUNIPER_ST },
916 /* Bluetooth HCI UART transport layer, with pseudo-header */
917 { DLT_BLUETOOTH_HCI_H4_WITH_PHDR, LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR },
919 /* AX.25 with KISS header */
920 { DLT_AX25_KISS, LINKTYPE_AX25_KISS },
922 /* Raw LAPD, with no pseudo-header */
923 { DLT_LAPD, LINKTYPE_LAPD },
925 /* PPP with one-byte pseudo-header giving direction */
926 { DLT_PPP_WITH_DIR, LINKTYPE_PPP_WITH_DIR },
928 /* Cisco HDLC with one-byte pseudo-header giving direction */
929 { DLT_C_HDLC_WITH_DIR, LINKTYPE_C_HDLC_WITH_DIR },
931 /* Frame Relay with one-byte pseudo-header giving direction */
932 { DLT_FRELAY_WITH_DIR, LINKTYPE_FRELAY_WITH_DIR },
934 /* LAPB with one-byte pseudo-header giving direction */
935 { DLT_LAPB_WITH_DIR, LINKTYPE_LAPB_WITH_DIR },
937 /* IPMB with Linux pseudo-header */
938 { DLT_IPMB_LINUX, LINKTYPE_IPMB_LINUX },
941 { DLT_FLEXRAY, LINKTYPE_FLEXRAY },
944 { DLT_MOST, LINKTYPE_MOST },
947 { DLT_LIN, LINKTYPE_LIN },
949 /* X2E-private serial line capture */
950 { DLT_X2E_SERIAL, LINKTYPE_X2E_SERIAL },
952 /* X2E-private for Xoraya data logger family */
953 { DLT_X2E_XORAYA, LINKTYPE_X2E_XORAYA },
955 /* IEEE 802.15.4 with PHY data for non-ASK PHYs */
956 { DLT_IEEE802_15_4_NONASK_PHY, LINKTYPE_IEEE802_15_4_NONASK_PHY },
962 * Mechanism for storing information about a capture in the upper
963 * 6 bits of a linktype value in a capture file.
965 * LT_LINKTYPE_EXT(x) extracts the additional information.
967 * The rest of the bits are for a value describing the link-layer
968 * value. LT_LINKTYPE(x) extracts that value.
970 #define LT_LINKTYPE(x) ((x) & 0x03FFFFFF)
971 #define LT_LINKTYPE_EXT(x) ((x) & 0xFC000000)
974 dlt_to_linktype(int dlt)
978 for (i = 0; map[i].dlt != -1; i++) {
979 if (map[i].dlt == dlt)
980 return (map[i].linktype);
984 * If we don't have a mapping for this DLT_ code, return an
985 * error; that means that the table above needs to have an
992 linktype_to_dlt(int linktype)
996 for (i = 0; map[i].linktype != -1; i++) {
997 if (map[i].linktype == linktype)
1002 * If we don't have an entry for this link type, return
1003 * the link type value; it may be a DLT_ value from an
1004 * older version of libpcap.
1010 sf_write_header(FILE *fp, int linktype, int thiszone, int snaplen)
1012 struct pcap_file_header hdr;
1014 hdr.magic = TCPDUMP_MAGIC;
1015 hdr.version_major = PCAP_VERSION_MAJOR;
1016 hdr.version_minor = PCAP_VERSION_MINOR;
1018 hdr.thiszone = thiszone;
1019 hdr.snaplen = snaplen;
1021 hdr.linktype = linktype;
1023 if (fwrite((char *)&hdr, sizeof(hdr), 1, fp) != 1)
1030 swap_hdr(struct pcap_file_header *hp)
1032 hp->version_major = SWAPSHORT(hp->version_major);
1033 hp->version_minor = SWAPSHORT(hp->version_minor);
1034 hp->thiszone = SWAPLONG(hp->thiszone);
1035 hp->sigfigs = SWAPLONG(hp->sigfigs);
1036 hp->snaplen = SWAPLONG(hp->snaplen);
1037 hp->linktype = SWAPLONG(hp->linktype);
1041 sf_getnonblock(pcap_t *p, char *errbuf)
1044 * This is a savefile, not a live capture file, so never say
1045 * it's in non-blocking mode.
1051 sf_setnonblock(pcap_t *p, int nonblock, char *errbuf)
1054 * This is a savefile, not a live capture file, so ignore
1055 * requests to put it in non-blocking mode.
1061 sf_stats(pcap_t *p, struct pcap_stat *ps)
1063 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1064 "Statistics aren't available from savefiles");
1070 sf_setbuff(pcap_t *p, int dim)
1072 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1073 "The kernel buffer size cannot be set while reading from a file");
1078 sf_setmode(pcap_t *p, int mode)
1080 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1081 "impossible to set mode while reading from a file");
1086 sf_setmintocopy(pcap_t *p, int size)
1088 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1089 "The mintocopy parameter cannot be set while reading from a file");
1095 sf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
1097 strlcpy(p->errbuf, "Sending packets isn't supported on savefiles",
1103 * Set direction flag: Which packets do we accept on a forwarding
1104 * single device? IN, OUT or both?
1107 sf_setdirection(pcap_t *p, pcap_direction_t d)
1109 snprintf(p->errbuf, sizeof(p->errbuf),
1110 "Setting direction is not supported on savefiles");
1115 sf_cleanup(pcap_t *p)
1117 if (p->sf.rfile != stdin)
1118 (void)fclose(p->sf.rfile);
1119 if (p->sf.base != NULL)
1124 pcap_open_offline(const char *fname, char *errbuf)
1129 if (fname[0] == '-' && fname[1] == '\0')
1132 #if defined(WIN32) || defined(MSDOS)
1134 * We're reading from the standard input, so put it in binary
1135 * mode, as savefiles are binary files.
1141 #if !defined(WIN32) && !defined(MSDOS)
1142 fp = fopen(fname, "r");
1144 fp = fopen(fname, "rb");
1147 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", fname,
1148 pcap_strerror(errno));
1152 p = pcap_fopen_offline(fp, errbuf);
1161 pcap_t* pcap_hopen_offline(intptr_t osfd, char *errbuf)
1166 fd = _open_osfhandle(osfd, _O_RDONLY);
1169 snprintf(errbuf, PCAP_ERRBUF_SIZE, pcap_strerror(errno));
1173 file = _fdopen(fd, "rb");
1176 snprintf(errbuf, PCAP_ERRBUF_SIZE, pcap_strerror(errno));
1180 return pcap_fopen_offline(file, errbuf);
1188 pcap_fopen_offline(FILE *fp, char *errbuf)
1191 struct pcap_file_header hdr;
1196 p = (pcap_t *)malloc(sizeof(*p));
1198 strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE);
1202 memset((char *)p, 0, sizeof(*p));
1204 amt_read = fread((char *)&hdr, 1, sizeof(hdr), fp);
1205 if (amt_read != sizeof(hdr)) {
1207 snprintf(errbuf, PCAP_ERRBUF_SIZE,
1208 "error reading dump file: %s",
1209 pcap_strerror(errno));
1211 snprintf(errbuf, PCAP_ERRBUF_SIZE,
1212 "truncated dump file; tried to read %lu file header bytes, only got %lu",
1213 (unsigned long)sizeof(hdr),
1214 (unsigned long)amt_read);
1219 if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) {
1220 magic = SWAPLONG(magic);
1221 if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) {
1222 snprintf(errbuf, PCAP_ERRBUF_SIZE,
1223 "bad dump file format");
1229 if (magic == KUZNETZOV_TCPDUMP_MAGIC) {
1231 * XXX - the patch that's in some versions of libpcap
1232 * changes the packet header but not the magic number,
1233 * and some other versions with this magic number have
1234 * some extra debugging information in the packet header;
1235 * we'd have to use some hacks^H^H^H^H^Hheuristics to
1236 * detect those variants.
1238 * Ethereal does that, but it does so by trying to read
1239 * the first two packets of the file with each of the
1240 * record header formats. That currently means it seeks
1241 * backwards and retries the reads, which doesn't work
1242 * on pipes. We want to be able to read from a pipe, so
1243 * that strategy won't work; we'd have to buffer some
1244 * data ourselves and read from that buffer in order to
1247 p->sf.hdrsize = sizeof(struct pcap_sf_patched_pkthdr);
1249 p->sf.hdrsize = sizeof(struct pcap_sf_pkthdr);
1250 if (hdr.version_major < PCAP_VERSION_MAJOR) {
1251 snprintf(errbuf, PCAP_ERRBUF_SIZE, "archaic file format");
1254 p->tzoff = hdr.thiszone;
1255 p->snapshot = hdr.snaplen;
1256 p->linktype = linktype_to_dlt(LT_LINKTYPE(hdr.linktype));
1257 p->linktype_ext = LT_LINKTYPE_EXT(hdr.linktype);
1258 if (magic == KUZNETZOV_TCPDUMP_MAGIC && p->linktype == DLT_EN10MB) {
1260 * This capture might have been done in raw mode or cooked
1263 * If it was done in cooked mode, p->snapshot was passed
1264 * to recvfrom() as the buffer size, meaning that the
1265 * most packet data that would be copied would be
1266 * p->snapshot. However, a faked Ethernet header would
1267 * then have been added to it, so the most data that would
1268 * be in a packet in the file would be p->snapshot + 14.
1270 * We can't easily tell whether the capture was done in
1271 * raw mode or cooked mode, so we'll assume it was
1272 * cooked mode, and add 14 to the snapshot length. That
1273 * means that, for a raw capture, the snapshot length will
1274 * be misleading if you use it to figure out why a capture
1275 * doesn't have all the packet data, but there's not much
1276 * we can do to avoid that.
1282 p->bufsize = hdr.snaplen;
1284 /* Allocate the space for pcap_pkthdr as well. It will be used by pcap_read_ex */
1285 p->bufsize = hdr.snaplen+sizeof(struct pcap_pkthdr);
1288 /* Align link header as required for proper data alignment */
1289 /* XXX should handle all types */
1290 switch (p->linktype) {
1297 linklen = 13 + 8; /* fddi_header + llc */
1307 p->bufsize = BPF_MAXBUFSIZE;
1308 p->sf.base = (u_char *)malloc(p->bufsize + BPF_ALIGNMENT);
1309 if (p->sf.base == NULL) {
1310 strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE);
1313 p->buffer = p->sf.base + BPF_ALIGNMENT - (linklen % BPF_ALIGNMENT);
1314 p->sf.version_major = hdr.version_major;
1315 p->sf.version_minor = hdr.version_minor;
1317 /* Padding only needed for live capture fcode */
1322 * We interchanged the caplen and len fields at version 2.3,
1323 * in order to match the bpf header layout. But unfortunately
1324 * some files were written with version 2.3 in their headers
1325 * but without the interchanged fields.
1327 * In addition, DG/UX tcpdump writes out files with a version
1328 * number of 543.0, and with the caplen and len fields in the
1331 switch (hdr.version_major) {
1334 if (hdr.version_minor < 3)
1335 p->sf.lengths_swapped = SWAPPED;
1336 else if (hdr.version_minor == 3)
1337 p->sf.lengths_swapped = MAYBE_SWAPPED;
1339 p->sf.lengths_swapped = NOT_SWAPPED;
1343 p->sf.lengths_swapped = SWAPPED;
1347 p->sf.lengths_swapped = NOT_SWAPPED;
1351 #if !defined(WIN32) && !defined(MSDOS)
1353 * You can do "select()" and "poll()" on plain files on most
1354 * platforms, and should be able to do so on pipes.
1356 * You can't do "select()" on anything other than sockets in
1357 * Windows, so, on Win32 systems, we don't have "selectable_fd".
1359 p->selectable_fd = fileno(fp);
1362 p->read_op = pcap_offline_read;
1363 p->inject_op = sf_inject;
1364 p->setfilter_op = install_bpf_program;
1365 p->setdirection_op = sf_setdirection;
1366 p->set_datalink_op = NULL; /* we don't support munging link-layer headers */
1367 p->getnonblock_op = sf_getnonblock;
1368 p->setnonblock_op = sf_setnonblock;
1369 p->stats_op = sf_stats;
1371 p->setbuff_op = sf_setbuff;
1372 p->setmode_op = sf_setmode;
1373 p->setmintocopy_op = sf_setmintocopy;
1375 p->cleanup_op = sf_cleanup;
1385 * Read sf_readfile and return the next packet. Return the header in hdr
1386 * and the contents in buf. Return 0 on success, SFERR_EOF if there were
1387 * no more packets, and SFERR_TRUNC if a partial packet was encountered.
1390 sf_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char *buf, u_int buflen)
1392 struct pcap_sf_patched_pkthdr sf_hdr;
1393 FILE *fp = p->sf.rfile;
1398 * Read the packet header; the structure we use as a buffer
1399 * is the longer structure for files generated by the patched
1400 * libpcap, but if the file has the magic number for an
1401 * unpatched libpcap we only read as many bytes as the regular
1404 amt_read = fread(&sf_hdr, 1, p->sf.hdrsize, fp);
1405 if (amt_read != p->sf.hdrsize) {
1407 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1408 "error reading dump file: %s",
1409 pcap_strerror(errno));
1412 if (amt_read != 0) {
1413 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1414 "truncated dump file; tried to read %lu header bytes, only got %lu",
1415 (unsigned long)p->sf.hdrsize,
1416 (unsigned long)amt_read);
1424 if (p->sf.swapped) {
1425 /* these were written in opposite byte order */
1426 hdr->caplen = SWAPLONG(sf_hdr.caplen);
1427 hdr->len = SWAPLONG(sf_hdr.len);
1428 hdr->ts.tv_sec = SWAPLONG(sf_hdr.ts.tv_sec);
1429 hdr->ts.tv_usec = SWAPLONG(sf_hdr.ts.tv_usec);
1431 hdr->caplen = sf_hdr.caplen;
1432 hdr->len = sf_hdr.len;
1433 hdr->ts.tv_sec = sf_hdr.ts.tv_sec;
1434 hdr->ts.tv_usec = sf_hdr.ts.tv_usec;
1436 /* Swap the caplen and len fields, if necessary. */
1437 switch (p->sf.lengths_swapped) {
1443 if (hdr->caplen <= hdr->len) {
1445 * The captured length is <= the actual length,
1446 * so presumably they weren't swapped.
1454 hdr->caplen = hdr->len;
1459 if (hdr->caplen > buflen) {
1461 * This can happen due to Solaris 2.3 systems tripping
1462 * over the BUFMOD problem and not setting the snapshot
1463 * correctly in the savefile header. If the caplen isn't
1464 * grossly wrong, try to salvage.
1466 static u_char *tp = NULL;
1467 static size_t tsize = 0;
1469 if (hdr->caplen > 65535) {
1470 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1471 "bogus savefile header");
1475 if (tsize < hdr->caplen) {
1476 tsize = ((hdr->caplen + 1023) / 1024) * 1024;
1479 tp = (u_char *)malloc(tsize);
1482 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1483 "BUFMOD hack malloc");
1487 amt_read = fread((char *)tp, 1, hdr->caplen, fp);
1488 if (amt_read != hdr->caplen) {
1490 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1491 "error reading dump file: %s",
1492 pcap_strerror(errno));
1494 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1495 "truncated dump file; tried to read %u captured bytes, only got %lu",
1496 hdr->caplen, (unsigned long)amt_read);
1501 * We can only keep up to buflen bytes. Since caplen > buflen
1502 * is exactly how we got here, we know we can only keep the
1503 * first buflen bytes and must drop the remainder. Adjust
1504 * caplen accordingly, so we don't get confused later as
1505 * to how many bytes we have to play with.
1507 hdr->caplen = buflen;
1508 memcpy((char *)buf, (char *)tp, buflen);
1511 /* read the packet itself */
1512 amt_read = fread((char *)buf, 1, hdr->caplen, fp);
1513 if (amt_read != hdr->caplen) {
1515 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1516 "error reading dump file: %s",
1517 pcap_strerror(errno));
1519 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1520 "truncated dump file; tried to read %u captured bytes, only got %lu",
1521 hdr->caplen, (unsigned long)amt_read);
1528 * The DLT_USB_LINUX header is in host byte order when capturing
1529 * (it's supplied directly from a memory-mapped buffer shared
1532 * When reading a DLT_USB_LINUX capture file, we need to convert
1533 * it from the capturing host's byte order to the reading host's
1536 if (p->sf.swapped && p->linktype == DLT_USB_LINUX) {
1537 pcap_usb_header* uhdr = (pcap_usb_header*) buf;
1539 * The URB id is a totally opaque value; do we really need to
1540 * converte it to the reading host's byte order???
1542 if (hdr->caplen < 8)
1544 uhdr->id = SWAPLL(uhdr->id);
1545 if (hdr->caplen < 14)
1547 uhdr->bus_id = SWAPSHORT(uhdr->bus_id);
1548 if (hdr->caplen < 24)
1550 uhdr->ts_sec = SWAPLL(uhdr->ts_sec);
1551 if (hdr->caplen < 28)
1553 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec);
1554 if (hdr->caplen < 32)
1556 uhdr->status = SWAPLONG(uhdr->status);
1557 if (hdr->caplen < 36)
1559 uhdr->urb_len = SWAPLONG(uhdr->urb_len);
1560 if (hdr->caplen < 40)
1562 uhdr->data_len = SWAPLONG(uhdr->data_len);
1568 * Print out packets stored in the file initialized by sf_read_init().
1569 * If cnt > 0, return after 'cnt' packets, otherwise continue until eof.
1572 pcap_offline_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
1574 struct bpf_insn *fcode;
1578 while (status == 0) {
1579 struct pcap_pkthdr h;
1582 * Has "pcap_breakloop()" been called?
1583 * If so, return immediately - if we haven't read any
1584 * packets, clear the flag and return -2 to indicate
1585 * that we were told to break out of the loop, otherwise
1586 * leave the flag set, so that the *next* call will break
1587 * out of the loop without having read any packets, and
1588 * return the number of packets we've processed so far.
1590 if (p->break_loop) {
1598 status = sf_next_packet(p, &h, p->buffer, p->bufsize);
1605 if ((fcode = p->fcode.bf_insns) == NULL ||
1606 bpf_filter(fcode, p->buffer, h.len, h.caplen)) {
1607 (*callback)(user, &h, p->buffer);
1608 if (++n >= cnt && cnt > 0)
1612 /*XXX this breaks semantics tcpslice expects */
1617 * Output a packet to the initialized dump file.
1620 pcap_dump(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1623 struct pcap_sf_pkthdr sf_hdr;
1626 sf_hdr.ts.tv_sec = h->ts.tv_sec;
1627 sf_hdr.ts.tv_usec = h->ts.tv_usec;
1628 sf_hdr.caplen = h->caplen;
1629 sf_hdr.len = h->len;
1630 /* XXX we should check the return status */
1631 (void)fwrite(&sf_hdr, sizeof(sf_hdr), 1, f);
1632 (void)fwrite(sp, h->caplen, 1, f);
1635 static pcap_dumper_t *
1636 pcap_setup_dump(pcap_t *p, int linktype, FILE *f, const char *fname)
1639 #if defined(WIN32) || defined(MSDOS)
1641 * If we're writing to the standard output, put it in binary
1642 * mode, as savefiles are binary files.
1644 * Otherwise, we turn off buffering.
1645 * XXX - why? And why not on the standard output?
1652 if (sf_write_header(f, linktype, p->tzoff, p->snapshot) == -1) {
1653 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't write to %s: %s",
1654 fname, pcap_strerror(errno));
1659 return ((pcap_dumper_t *)f);
1663 * Initialize so that sf_write() will output to the file named 'fname'.
1666 pcap_dump_open(pcap_t *p, const char *fname)
1671 linktype = dlt_to_linktype(p->linktype);
1672 if (linktype == -1) {
1673 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1674 "%s: link-layer type %d isn't supported in savefiles",
1678 linktype |= p->linktype_ext;
1680 if (fname[0] == '-' && fname[1] == '\0') {
1682 fname = "standard output";
1684 #if !defined(WIN32) && !defined(MSDOS)
1685 f = fopen(fname, "w");
1687 f = fopen(fname, "wb");
1690 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
1691 fname, pcap_strerror(errno));
1695 return (pcap_setup_dump(p, linktype, f, fname));
1699 * Initialize so that sf_write() will output to the given stream.
1702 pcap_dump_fopen(pcap_t *p, FILE *f)
1706 linktype = dlt_to_linktype(p->linktype);
1707 if (linktype == -1) {
1708 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1709 "stream: link-layer type %d isn't supported in savefiles",
1713 linktype |= p->linktype_ext;
1715 return (pcap_setup_dump(p, linktype, f, "stream"));
1719 pcap_dump_file(pcap_dumper_t *p)
1725 pcap_dump_ftell(pcap_dumper_t *p)
1727 return (ftell((FILE *)p));
1731 pcap_dump_flush(pcap_dumper_t *p)
1734 if (fflush((FILE *)p) == EOF)
1741 pcap_dump_close(pcap_dumper_t *p)
1745 if (ferror((FILE *)p))
1747 /* XXX should check return from fclose() too */
1749 (void)fclose((FILE *)p);