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
},
910 /* Juniper Secure Tunnel */
911 { DLT_JUNIPER_ST
, LINKTYPE_JUNIPER_ST
},
913 /* Bluetooth HCI UART transport layer, with pseudo-header */
914 { DLT_BLUETOOTH_HCI_H4_WITH_PHDR
, LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR
},
916 /* AX.25 with KISS header */
917 { DLT_AX25_KISS
, LINKTYPE_AX25_KISS
},
919 /* Raw LAPD, with no pseudo-header */
920 { DLT_LAPD
, LINKTYPE_LAPD
},
922 /* PPP with one-byte pseudo-header giving direction */
923 { DLT_PPP_WITH_DIR
, LINKTYPE_PPP_WITH_DIR
},
925 /* Cisco HDLC with one-byte pseudo-header giving direction */
926 { DLT_C_HDLC_WITH_DIR
, LINKTYPE_C_HDLC_WITH_DIR
},
928 /* Frame Relay with one-byte pseudo-header giving direction */
929 { DLT_FRELAY_WITH_DIR
, LINKTYPE_FRELAY_WITH_DIR
},
931 /* LAPB with one-byte pseudo-header giving direction */
932 { DLT_LAPB_WITH_DIR
, LINKTYPE_LAPB_WITH_DIR
},
934 /* IPMB with Linux pseudo-header */
935 { DLT_IPMB_LINUX
, LINKTYPE_IPMB_LINUX
},
938 { DLT_FLEXRAY
, LINKTYPE_FLEXRAY
},
941 { DLT_MOST
, LINKTYPE_MOST
},
944 { DLT_LIN
, LINKTYPE_LIN
},
946 /* X2E-private serial line capture */
947 { DLT_X2E_SERIAL
, LINKTYPE_X2E_SERIAL
},
949 /* X2E-private for Xoraya data logger family */
950 { DLT_X2E_XORAYA
, LINKTYPE_X2E_XORAYA
},
952 /* IEEE 802.15.4 with PHY data for non-ASK PHYs */
953 { DLT_IEEE802_15_4_NONASK_PHY
, LINKTYPE_IEEE802_15_4_NONASK_PHY
},
959 * Mechanism for storing information about a capture in the upper
960 * 6 bits of a linktype value in a capture file.
962 * LT_LINKTYPE_EXT(x) extracts the additional information.
964 * The rest of the bits are for a value describing the link-layer
965 * value. LT_LINKTYPE(x) extracts that value.
967 #define LT_LINKTYPE(x) ((x) & 0x03FFFFFF)
968 #define LT_LINKTYPE_EXT(x) ((x) & 0xFC000000)
971 dlt_to_linktype(int dlt
)
975 for (i
= 0; map
[i
].dlt
!= -1; i
++) {
976 if (map
[i
].dlt
== dlt
)
977 return (map
[i
].linktype
);
981 * If we don't have a mapping for this DLT_ code, return an
982 * error; that means that the table above needs to have an
989 linktype_to_dlt(int linktype
)
993 for (i
= 0; map
[i
].linktype
!= -1; i
++) {
994 if (map
[i
].linktype
== linktype
)
999 * If we don't have an entry for this link type, return
1000 * the link type value; it may be a DLT_ value from an
1001 * older version of libpcap.
1007 sf_write_header(FILE *fp
, int linktype
, int thiszone
, int snaplen
)
1009 struct pcap_file_header hdr
;
1011 hdr
.magic
= TCPDUMP_MAGIC
;
1012 hdr
.version_major
= PCAP_VERSION_MAJOR
;
1013 hdr
.version_minor
= PCAP_VERSION_MINOR
;
1015 hdr
.thiszone
= thiszone
;
1016 hdr
.snaplen
= snaplen
;
1018 hdr
.linktype
= linktype
;
1020 if (fwrite((char *)&hdr
, sizeof(hdr
), 1, fp
) != 1)
1027 swap_hdr(struct pcap_file_header
*hp
)
1029 hp
->version_major
= SWAPSHORT(hp
->version_major
);
1030 hp
->version_minor
= SWAPSHORT(hp
->version_minor
);
1031 hp
->thiszone
= SWAPLONG(hp
->thiszone
);
1032 hp
->sigfigs
= SWAPLONG(hp
->sigfigs
);
1033 hp
->snaplen
= SWAPLONG(hp
->snaplen
);
1034 hp
->linktype
= SWAPLONG(hp
->linktype
);
1038 sf_getnonblock(pcap_t
*p
, char *errbuf
)
1041 * This is a savefile, not a live capture file, so never say
1042 * it's in non-blocking mode.
1048 sf_setnonblock(pcap_t
*p
, int nonblock
, char *errbuf
)
1051 * This is a savefile, not a live capture file, so ignore
1052 * requests to put it in non-blocking mode.
1058 sf_stats(pcap_t
*p
, struct pcap_stat
*ps
)
1060 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1061 "Statistics aren't available from savefiles");
1067 sf_setbuff(pcap_t
*p
, int dim
)
1069 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1070 "The kernel buffer size cannot be set while reading from a file");
1075 sf_setmode(pcap_t
*p
, int mode
)
1077 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1078 "impossible to set mode while reading from a file");
1083 sf_setmintocopy(pcap_t
*p
, int size
)
1085 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1086 "The mintocopy parameter cannot be set while reading from a file");
1092 sf_inject(pcap_t
*p
, const void *buf _U_
, size_t size _U_
)
1094 strlcpy(p
->errbuf
, "Sending packets isn't supported on savefiles",
1100 * Set direction flag: Which packets do we accept on a forwarding
1101 * single device? IN, OUT or both?
1104 sf_setdirection(pcap_t
*p
, pcap_direction_t d
)
1106 snprintf(p
->errbuf
, sizeof(p
->errbuf
),
1107 "Setting direction is not supported on savefiles");
1112 sf_cleanup(pcap_t
*p
)
1114 if (p
->sf
.rfile
!= stdin
)
1115 (void)fclose(p
->sf
.rfile
);
1116 if (p
->sf
.base
!= NULL
)
1121 pcap_open_offline(const char *fname
, char *errbuf
)
1126 if (fname
[0] == '-' && fname
[1] == '\0')
1129 #if defined(WIN32) || defined(MSDOS)
1131 * We're reading from the standard input, so put it in binary
1132 * mode, as savefiles are binary files.
1138 #if !defined(WIN32) && !defined(MSDOS)
1139 fp
= fopen(fname
, "r");
1141 fp
= fopen(fname
, "rb");
1144 snprintf(errbuf
, PCAP_ERRBUF_SIZE
, "%s: %s", fname
,
1145 pcap_strerror(errno
));
1149 p
= pcap_fopen_offline(fp
, errbuf
);
1158 pcap_t
* pcap_hopen_offline(intptr_t osfd
, char *errbuf
)
1163 fd
= _open_osfhandle(osfd
, _O_RDONLY
);
1166 snprintf(errbuf
, PCAP_ERRBUF_SIZE
, pcap_strerror(errno
));
1170 file
= _fdopen(fd
, "rb");
1173 snprintf(errbuf
, PCAP_ERRBUF_SIZE
, pcap_strerror(errno
));
1177 return pcap_fopen_offline(file
, errbuf
);
1185 pcap_fopen_offline(FILE *fp
, char *errbuf
)
1188 struct pcap_file_header hdr
;
1193 p
= (pcap_t
*)malloc(sizeof(*p
));
1195 strlcpy(errbuf
, "out of swap", PCAP_ERRBUF_SIZE
);
1199 memset((char *)p
, 0, sizeof(*p
));
1201 amt_read
= fread((char *)&hdr
, 1, sizeof(hdr
), fp
);
1202 if (amt_read
!= sizeof(hdr
)) {
1204 snprintf(errbuf
, PCAP_ERRBUF_SIZE
,
1205 "error reading dump file: %s",
1206 pcap_strerror(errno
));
1208 snprintf(errbuf
, PCAP_ERRBUF_SIZE
,
1209 "truncated dump file; tried to read %lu file header bytes, only got %lu",
1210 (unsigned long)sizeof(hdr
),
1211 (unsigned long)amt_read
);
1216 if (magic
!= TCPDUMP_MAGIC
&& magic
!= KUZNETZOV_TCPDUMP_MAGIC
) {
1217 magic
= SWAPLONG(magic
);
1218 if (magic
!= TCPDUMP_MAGIC
&& magic
!= KUZNETZOV_TCPDUMP_MAGIC
) {
1219 snprintf(errbuf
, PCAP_ERRBUF_SIZE
,
1220 "bad dump file format");
1226 if (magic
== KUZNETZOV_TCPDUMP_MAGIC
) {
1228 * XXX - the patch that's in some versions of libpcap
1229 * changes the packet header but not the magic number,
1230 * and some other versions with this magic number have
1231 * some extra debugging information in the packet header;
1232 * we'd have to use some hacks^H^H^H^H^Hheuristics to
1233 * detect those variants.
1235 * Ethereal does that, but it does so by trying to read
1236 * the first two packets of the file with each of the
1237 * record header formats. That currently means it seeks
1238 * backwards and retries the reads, which doesn't work
1239 * on pipes. We want to be able to read from a pipe, so
1240 * that strategy won't work; we'd have to buffer some
1241 * data ourselves and read from that buffer in order to
1244 p
->sf
.hdrsize
= sizeof(struct pcap_sf_patched_pkthdr
);
1246 p
->sf
.hdrsize
= sizeof(struct pcap_sf_pkthdr
);
1247 if (hdr
.version_major
< PCAP_VERSION_MAJOR
) {
1248 snprintf(errbuf
, PCAP_ERRBUF_SIZE
, "archaic file format");
1251 p
->tzoff
= hdr
.thiszone
;
1252 p
->snapshot
= hdr
.snaplen
;
1253 p
->linktype
= linktype_to_dlt(LT_LINKTYPE(hdr
.linktype
));
1254 p
->linktype_ext
= LT_LINKTYPE_EXT(hdr
.linktype
);
1255 if (magic
== KUZNETZOV_TCPDUMP_MAGIC
&& p
->linktype
== DLT_EN10MB
) {
1257 * This capture might have been done in raw mode or cooked
1260 * If it was done in cooked mode, p->snapshot was passed
1261 * to recvfrom() as the buffer size, meaning that the
1262 * most packet data that would be copied would be
1263 * p->snapshot. However, a faked Ethernet header would
1264 * then have been added to it, so the most data that would
1265 * be in a packet in the file would be p->snapshot + 14.
1267 * We can't easily tell whether the capture was done in
1268 * raw mode or cooked mode, so we'll assume it was
1269 * cooked mode, and add 14 to the snapshot length. That
1270 * means that, for a raw capture, the snapshot length will
1271 * be misleading if you use it to figure out why a capture
1272 * doesn't have all the packet data, but there's not much
1273 * we can do to avoid that.
1279 p
->bufsize
= hdr
.snaplen
;
1281 /* Allocate the space for pcap_pkthdr as well. It will be used by pcap_read_ex */
1282 p
->bufsize
= hdr
.snaplen
+sizeof(struct pcap_pkthdr
);
1285 /* Align link header as required for proper data alignment */
1286 /* XXX should handle all types */
1287 switch (p
->linktype
) {
1294 linklen
= 13 + 8; /* fddi_header + llc */
1304 p
->bufsize
= BPF_MAXBUFSIZE
;
1305 p
->sf
.base
= (u_char
*)malloc(p
->bufsize
+ BPF_ALIGNMENT
);
1306 if (p
->sf
.base
== NULL
) {
1307 strlcpy(errbuf
, "out of swap", PCAP_ERRBUF_SIZE
);
1310 p
->buffer
= p
->sf
.base
+ BPF_ALIGNMENT
- (linklen
% BPF_ALIGNMENT
);
1311 p
->sf
.version_major
= hdr
.version_major
;
1312 p
->sf
.version_minor
= hdr
.version_minor
;
1314 /* Padding only needed for live capture fcode */
1319 * We interchanged the caplen and len fields at version 2.3,
1320 * in order to match the bpf header layout. But unfortunately
1321 * some files were written with version 2.3 in their headers
1322 * but without the interchanged fields.
1324 * In addition, DG/UX tcpdump writes out files with a version
1325 * number of 543.0, and with the caplen and len fields in the
1328 switch (hdr
.version_major
) {
1331 if (hdr
.version_minor
< 3)
1332 p
->sf
.lengths_swapped
= SWAPPED
;
1333 else if (hdr
.version_minor
== 3)
1334 p
->sf
.lengths_swapped
= MAYBE_SWAPPED
;
1336 p
->sf
.lengths_swapped
= NOT_SWAPPED
;
1340 p
->sf
.lengths_swapped
= SWAPPED
;
1344 p
->sf
.lengths_swapped
= NOT_SWAPPED
;
1348 #if !defined(WIN32) && !defined(MSDOS)
1350 * You can do "select()" and "poll()" on plain files on most
1351 * platforms, and should be able to do so on pipes.
1353 * You can't do "select()" on anything other than sockets in
1354 * Windows, so, on Win32 systems, we don't have "selectable_fd".
1356 p
->selectable_fd
= fileno(fp
);
1359 p
->read_op
= pcap_offline_read
;
1360 p
->inject_op
= sf_inject
;
1361 p
->setfilter_op
= install_bpf_program
;
1362 p
->setdirection_op
= sf_setdirection
;
1363 p
->set_datalink_op
= NULL
; /* we don't support munging link-layer headers */
1364 p
->getnonblock_op
= sf_getnonblock
;
1365 p
->setnonblock_op
= sf_setnonblock
;
1366 p
->stats_op
= sf_stats
;
1368 p
->setbuff_op
= sf_setbuff
;
1369 p
->setmode_op
= sf_setmode
;
1370 p
->setmintocopy_op
= sf_setmintocopy
;
1372 p
->cleanup_op
= sf_cleanup
;
1382 * Read sf_readfile and return the next packet. Return the header in hdr
1383 * and the contents in buf. Return 0 on success, SFERR_EOF if there were
1384 * no more packets, and SFERR_TRUNC if a partial packet was encountered.
1387 sf_next_packet(pcap_t
*p
, struct pcap_pkthdr
*hdr
, u_char
*buf
, u_int buflen
)
1389 struct pcap_sf_patched_pkthdr sf_hdr
;
1390 FILE *fp
= p
->sf
.rfile
;
1395 * Read the packet header; the structure we use as a buffer
1396 * is the longer structure for files generated by the patched
1397 * libpcap, but if the file has the magic number for an
1398 * unpatched libpcap we only read as many bytes as the regular
1401 amt_read
= fread(&sf_hdr
, 1, p
->sf
.hdrsize
, fp
);
1402 if (amt_read
!= p
->sf
.hdrsize
) {
1404 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1405 "error reading dump file: %s",
1406 pcap_strerror(errno
));
1409 if (amt_read
!= 0) {
1410 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1411 "truncated dump file; tried to read %lu header bytes, only got %lu",
1412 (unsigned long)p
->sf
.hdrsize
,
1413 (unsigned long)amt_read
);
1421 if (p
->sf
.swapped
) {
1422 /* these were written in opposite byte order */
1423 hdr
->caplen
= SWAPLONG(sf_hdr
.caplen
);
1424 hdr
->len
= SWAPLONG(sf_hdr
.len
);
1425 hdr
->ts
.tv_sec
= SWAPLONG(sf_hdr
.ts
.tv_sec
);
1426 hdr
->ts
.tv_usec
= SWAPLONG(sf_hdr
.ts
.tv_usec
);
1428 hdr
->caplen
= sf_hdr
.caplen
;
1429 hdr
->len
= sf_hdr
.len
;
1430 hdr
->ts
.tv_sec
= sf_hdr
.ts
.tv_sec
;
1431 hdr
->ts
.tv_usec
= sf_hdr
.ts
.tv_usec
;
1433 /* Swap the caplen and len fields, if necessary. */
1434 switch (p
->sf
.lengths_swapped
) {
1440 if (hdr
->caplen
<= hdr
->len
) {
1442 * The captured length is <= the actual length,
1443 * so presumably they weren't swapped.
1451 hdr
->caplen
= hdr
->len
;
1456 if (hdr
->caplen
> buflen
) {
1458 * This can happen due to Solaris 2.3 systems tripping
1459 * over the BUFMOD problem and not setting the snapshot
1460 * correctly in the savefile header. If the caplen isn't
1461 * grossly wrong, try to salvage.
1463 static u_char
*tp
= NULL
;
1464 static size_t tsize
= 0;
1466 if (hdr
->caplen
> 65535) {
1467 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1468 "bogus savefile header");
1472 if (tsize
< hdr
->caplen
) {
1473 tsize
= ((hdr
->caplen
+ 1023) / 1024) * 1024;
1476 tp
= (u_char
*)malloc(tsize
);
1479 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1480 "BUFMOD hack malloc");
1484 amt_read
= fread((char *)tp
, 1, hdr
->caplen
, fp
);
1485 if (amt_read
!= hdr
->caplen
) {
1487 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1488 "error reading dump file: %s",
1489 pcap_strerror(errno
));
1491 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1492 "truncated dump file; tried to read %u captured bytes, only got %lu",
1493 hdr
->caplen
, (unsigned long)amt_read
);
1498 * We can only keep up to buflen bytes. Since caplen > buflen
1499 * is exactly how we got here, we know we can only keep the
1500 * first buflen bytes and must drop the remainder. Adjust
1501 * caplen accordingly, so we don't get confused later as
1502 * to how many bytes we have to play with.
1504 hdr
->caplen
= buflen
;
1505 memcpy((char *)buf
, (char *)tp
, buflen
);
1508 /* read the packet itself */
1509 amt_read
= fread((char *)buf
, 1, hdr
->caplen
, fp
);
1510 if (amt_read
!= hdr
->caplen
) {
1512 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1513 "error reading dump file: %s",
1514 pcap_strerror(errno
));
1516 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1517 "truncated dump file; tried to read %u captured bytes, only got %lu",
1518 hdr
->caplen
, (unsigned long)amt_read
);
1525 * The DLT_USB_LINUX header is in host byte order when capturing
1526 * (it's supplied directly from a memory-mapped buffer shared
1529 * When reading a DLT_USB_LINUX capture file, we need to convert
1530 * it from the capturing host's byte order to the reading host's
1533 if (p
->sf
.swapped
&& p
->linktype
== DLT_USB_LINUX
) {
1534 pcap_usb_header
* uhdr
= (pcap_usb_header
*) buf
;
1536 * The URB id is a totally opaque value; do we really need to
1537 * converte it to the reading host's byte order???
1539 if (hdr
->caplen
< 8)
1541 uhdr
->id
= SWAPLL(uhdr
->id
);
1542 if (hdr
->caplen
< 14)
1544 uhdr
->bus_id
= SWAPSHORT(uhdr
->bus_id
);
1545 if (hdr
->caplen
< 24)
1547 uhdr
->ts_sec
= SWAPLL(uhdr
->ts_sec
);
1548 if (hdr
->caplen
< 28)
1550 uhdr
->ts_usec
= SWAPLONG(uhdr
->ts_usec
);
1551 if (hdr
->caplen
< 32)
1553 uhdr
->status
= SWAPLONG(uhdr
->status
);
1554 if (hdr
->caplen
< 36)
1556 uhdr
->urb_len
= SWAPLONG(uhdr
->urb_len
);
1557 if (hdr
->caplen
< 40)
1559 uhdr
->data_len
= SWAPLONG(uhdr
->data_len
);
1565 * Print out packets stored in the file initialized by sf_read_init().
1566 * If cnt > 0, return after 'cnt' packets, otherwise continue until eof.
1569 pcap_offline_read(pcap_t
*p
, int cnt
, pcap_handler callback
, u_char
*user
)
1571 struct bpf_insn
*fcode
;
1575 while (status
== 0) {
1576 struct pcap_pkthdr h
;
1579 * Has "pcap_breakloop()" been called?
1580 * If so, return immediately - if we haven't read any
1581 * packets, clear the flag and return -2 to indicate
1582 * that we were told to break out of the loop, otherwise
1583 * leave the flag set, so that the *next* call will break
1584 * out of the loop without having read any packets, and
1585 * return the number of packets we've processed so far.
1587 if (p
->break_loop
) {
1595 status
= sf_next_packet(p
, &h
, p
->buffer
, p
->bufsize
);
1602 if ((fcode
= p
->fcode
.bf_insns
) == NULL
||
1603 bpf_filter(fcode
, p
->buffer
, h
.len
, h
.caplen
)) {
1604 (*callback
)(user
, &h
, p
->buffer
);
1605 if (++n
>= cnt
&& cnt
> 0)
1609 /*XXX this breaks semantics tcpslice expects */
1614 * Output a packet to the initialized dump file.
1617 pcap_dump(u_char
*user
, const struct pcap_pkthdr
*h
, const u_char
*sp
)
1620 struct pcap_sf_pkthdr sf_hdr
;
1623 sf_hdr
.ts
.tv_sec
= h
->ts
.tv_sec
;
1624 sf_hdr
.ts
.tv_usec
= h
->ts
.tv_usec
;
1625 sf_hdr
.caplen
= h
->caplen
;
1626 sf_hdr
.len
= h
->len
;
1627 /* XXX we should check the return status */
1628 (void)fwrite(&sf_hdr
, sizeof(sf_hdr
), 1, f
);
1629 (void)fwrite(sp
, h
->caplen
, 1, f
);
1632 static pcap_dumper_t
*
1633 pcap_setup_dump(pcap_t
*p
, int linktype
, FILE *f
, const char *fname
)
1636 #if defined(WIN32) || defined(MSDOS)
1638 * If we're writing to the standard output, put it in binary
1639 * mode, as savefiles are binary files.
1641 * Otherwise, we turn off buffering.
1642 * XXX - why? And why not on the standard output?
1649 if (sf_write_header(f
, linktype
, p
->tzoff
, p
->snapshot
) == -1) {
1650 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
, "Can't write to %s: %s",
1651 fname
, pcap_strerror(errno
));
1656 return ((pcap_dumper_t
*)f
);
1660 * Initialize so that sf_write() will output to the file named 'fname'.
1663 pcap_dump_open(pcap_t
*p
, const char *fname
)
1668 linktype
= dlt_to_linktype(p
->linktype
);
1669 if (linktype
== -1) {
1670 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1671 "%s: link-layer type %d isn't supported in savefiles",
1675 linktype
|= p
->linktype_ext
;
1677 if (fname
[0] == '-' && fname
[1] == '\0') {
1679 fname
= "standard output";
1681 #if !defined(WIN32) && !defined(MSDOS)
1682 f
= fopen(fname
, "w");
1684 f
= fopen(fname
, "wb");
1687 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
, "%s: %s",
1688 fname
, pcap_strerror(errno
));
1692 return (pcap_setup_dump(p
, linktype
, f
, fname
));
1696 * Initialize so that sf_write() will output to the given stream.
1699 pcap_dump_fopen(pcap_t
*p
, FILE *f
)
1703 linktype
= dlt_to_linktype(p
->linktype
);
1704 if (linktype
== -1) {
1705 snprintf(p
->errbuf
, PCAP_ERRBUF_SIZE
,
1706 "stream: link-layer type %d isn't supported in savefiles",
1710 linktype
|= p
->linktype_ext
;
1712 return (pcap_setup_dump(p
, linktype
, f
, "stream"));
1716 pcap_dump_file(pcap_dumper_t
*p
)
1722 pcap_dump_ftell(pcap_dumper_t
*p
)
1724 return (ftell((FILE *)p
));
1728 pcap_dump_flush(pcap_dumper_t
*p
)
1731 if (fflush((FILE *)p
) == EOF
)
1738 pcap_dump_close(pcap_dumper_t
*p
)
1742 if (ferror((FILE *)p
))
1744 /* XXX should check return from fclose() too */
1746 (void)fclose((FILE *)p
);