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+/*
+ * Copyright (c) 1993, 1994, 1995, 1996, 1997
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code distributions
+ * retain the above copyright notice and this paragraph in its entirety, (2)
+ * distributions including binary code include the above copyright notice and
+ * this paragraph in its entirety in the documentation or other materials
+ * provided with the distribution, and (3) all advertising materials mentioning
+ * features or use of this software display the following acknowledgement:
+ * ``This product includes software developed by the University of California,
+ * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
+ * the University nor the names of its contributors may be used to endorse
+ * or promote products derived from this software without specific prior
+ * written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * savefile.c - supports offline use of tcpdump
+ * Extraction/creation by Jeffrey Mogul, DECWRL
+ * Modified by Steve McCanne, LBL.
+ *
+ * Used to save the received packet headers, after filtering, to
+ * a file, and then read them later.
+ * The first record in the file contains saved values for the machine
+ * dependent values so we can print the dump file on any architecture.
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/libpcap/savefile.c,v 1.126.2.30 2007/08/14 20:57:49 guy Exp $ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+#include <memory.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "pcap-int.h"
+
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+/*
+ * Standard libpcap format.
+ */
+#define TCPDUMP_MAGIC 0xa1b2c3d4
+
+/*
+ * Alexey Kuznetzov's modified libpcap format.
+ */
+#define KUZNETZOV_TCPDUMP_MAGIC 0xa1b2cd34
+
+/*
+ * Reserved for Francisco Mesquita <francisco.mesquita@radiomovel.pt>
+ * for another modified format.
+ */
+#define FMESQUITA_TCPDUMP_MAGIC 0xa1b234cd
+
+/*
+ * Navtel Communcations' format, with nanosecond timestamps,
+ * as per a request from Dumas Hwang <dumas.hwang@navtelcom.com>.
+ */
+#define NAVTEL_TCPDUMP_MAGIC 0xa12b3c4d
+
+/*
+ * Normal libpcap format, except for seconds/nanoseconds timestamps,
+ * as per a request by Ulf Lamping <ulf.lamping@web.de>
+ */
+#define NSEC_TCPDUMP_MAGIC 0xa1b23c4d
+
+/*
+ * We use the "receiver-makes-right" approach to byte order,
+ * because time is at a premium when we are writing the file.
+ * In other words, the pcap_file_header and pcap_pkthdr,
+ * records are written in host byte order.
+ * Note that the bytes of packet data are written out in the order in
+ * which they were received, so multi-byte fields in packets are not
+ * written in host byte order, they're written in whatever order the
+ * sending machine put them in.
+ *
+ * ntoh[ls] aren't sufficient because we might need to swap on a big-endian
+ * machine (if the file was written in little-end order).
+ */
+#define SWAPLONG(y) \
+((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
+#define SWAPSHORT(y) \
+ ( (((y)&0xff)<<8) | ((u_short)((y)&0xff00)>>8) )
+
+#define SFERR_TRUNC 1
+#define SFERR_BADVERSION 2
+#define SFERR_BADF 3
+#define SFERR_EOF 4 /* not really an error, just a status */
+
+/*
+ * Setting O_BINARY on DOS/Windows is a bit tricky
+ */
+#if defined(WIN32)
+ #define SET_BINMODE(f) _setmode(_fileno(f), _O_BINARY)
+#elif defined(MSDOS)
+ #if defined(__HIGHC__)
+ #define SET_BINMODE(f) setmode(f, O_BINARY)
+ #else
+ #define SET_BINMODE(f) setmode(fileno(f), O_BINARY)
+ #endif
+#endif
+
+/*
+ * We don't write DLT_* values to the capture file header, because
+ * they're not the same on all platforms.
+ *
+ * Unfortunately, the various flavors of BSD have not always used the same
+ * numerical values for the same data types, and various patches to
+ * libpcap for non-BSD OSes have added their own DLT_* codes for link
+ * layer encapsulation types seen on those OSes, and those codes have had,
+ * in some cases, values that were also used, on other platforms, for other
+ * link layer encapsulation types.
+ *
+ * This means that capture files of a type whose numerical DLT_* code
+ * means different things on different BSDs, or with different versions
+ * of libpcap, can't always be read on systems other than those like
+ * the one running on the machine on which the capture was made.
+ *
+ * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes
+ * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_*
+ * codes to DLT_* codes when reading a savefile header.
+ *
+ * For those DLT_* codes that have, as far as we know, the same values on
+ * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as
+ * DLT_xxx; that way, captures of those types can still be read by
+ * versions of libpcap that map LINKTYPE_* values to DLT_* values, and
+ * captures of those types written by versions of libpcap that map DLT_
+ * values to LINKTYPE_ values can still be read by older versions
+ * of libpcap.
+ *
+ * The other LINKTYPE_* codes are given values starting at 100, in the
+ * hopes that no DLT_* code will be given one of those values.
+ *
+ * In order to ensure that a given LINKTYPE_* code's value will refer to
+ * the same encapsulation type on all platforms, you should not allocate
+ * a new LINKTYPE_* value without consulting "tcpdump-workers@tcpdump.org".
+ * The tcpdump developers will allocate a value for you, and will not
+ * subsequently allocate it to anybody else; that value will be added to
+ * the "pcap.h" in the tcpdump.org CVS repository, so that a future
+ * libpcap release will include it.
+ *
+ * You should, if possible, also contribute patches to libpcap and tcpdump
+ * to handle the new encapsulation type, so that they can also be checked
+ * into the tcpdump.org CVS repository and so that they will appear in
+ * future libpcap and tcpdump releases.
+ *
+ * Do *NOT* assume that any values after the largest value in this file
+ * are available; you might not have the most up-to-date version of this
+ * file, and new values after that one might have been assigned. Also,
+ * do *NOT* use any values below 100 - those might already have been
+ * taken by one (or more!) organizations.
+ */
+#define LINKTYPE_NULL DLT_NULL
+#define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */
+#define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */
+#define LINKTYPE_AX25 DLT_AX25
+#define LINKTYPE_PRONET DLT_PRONET
+#define LINKTYPE_CHAOS DLT_CHAOS
+#define LINKTYPE_TOKEN_RING DLT_IEEE802 /* DLT_IEEE802 is used for Token Ring */
+#define LINKTYPE_ARCNET DLT_ARCNET /* BSD-style headers */
+#define LINKTYPE_SLIP DLT_SLIP
+#define LINKTYPE_PPP DLT_PPP
+#define LINKTYPE_FDDI DLT_FDDI
+
+/*
+ * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662
+ * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol
+ * field) at the beginning of the packet.
+ *
+ * This is for use when there is always such a header; the address field
+ * might be 0xff, for regular PPP, or it might be an address field for Cisco
+ * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco
+ * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL.
+ *
+ * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that
+ * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL
+ * captures will be written out with a link type that NetBSD's tcpdump
+ * can read.
+ */
+#define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */
+
+#define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */
+
+#define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */
+
+#define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */
+#define LINKTYPE_RAW 101 /* raw IP */
+#define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */
+#define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */
+#define LINKTYPE_C_HDLC 104 /* Cisco HDLC */
+#define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */
+#define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */
+#define LINKTYPE_FRELAY 107 /* Frame Relay */
+#define LINKTYPE_LOOP 108 /* OpenBSD loopback */
+#define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */
+
+/*
+ * These three types are reserved for future use.
+ */
+#define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */
+#define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */
+#define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */
+
+#define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */
+#define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */
+#define LINKTYPE_ECONET 115 /* Acorn Econet */
+
+/*
+ * Reserved for use with OpenBSD ipfilter.
+ */
+#define LINKTYPE_IPFILTER 116
+
+#define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */
+#define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */
+#define LINKTYPE_PRISM_HEADER 119 /* 802.11+Prism II monitor mode */
+#define LINKTYPE_AIRONET_HEADER 120 /* FreeBSD Aironet driver stuff */
+
+/*
+ * Reserved for Siemens HiPath HDLC.
+ */
+#define LINKTYPE_HHDLC 121
+
+#define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */
+#define LINKTYPE_SUNATM 123 /* Solaris+SunATM */
+
+/*
+ * Reserved as per request from Kent Dahlgren <kent@praesum.com>
+ * for private use.
+ */
+#define LINKTYPE_RIO 124 /* RapidIO */
+#define LINKTYPE_PCI_EXP 125 /* PCI Express */
+#define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */
+
+#define LINKTYPE_IEEE802_11_RADIO 127 /* 802.11 plus BSD radio header */
+
+/*
+ * Reserved for the TZSP encapsulation, as per request from
+ * Chris Waters <chris.waters@networkchemistry.com>
+ * TZSP is a generic encapsulation for any other link type,
+ * which includes a means to include meta-information
+ * with the packet, e.g. signal strength and channel
+ * for 802.11 packets.
+ */
+#define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */
+
+#define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */
+
+/*
+ * Juniper-private data link types, as per request from
+ * Hannes Gredler <hannes@juniper.net>. The corresponding
+ * DLT_s are used for passing on chassis-internal
+ * metainformation such as QOS profiles, etc..
+ */
+#define LINKTYPE_JUNIPER_MLPPP 130
+#define LINKTYPE_JUNIPER_MLFR 131
+#define LINKTYPE_JUNIPER_ES 132
+#define LINKTYPE_JUNIPER_GGSN 133
+#define LINKTYPE_JUNIPER_MFR 134
+#define LINKTYPE_JUNIPER_ATM2 135
+#define LINKTYPE_JUNIPER_SERVICES 136
+#define LINKTYPE_JUNIPER_ATM1 137
+
+#define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */
+
+#define LINKTYPE_MTP2_WITH_PHDR 139
+#define LINKTYPE_MTP2 140
+#define LINKTYPE_MTP3 141
+#define LINKTYPE_SCCP 142
+
+#define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */
+
+#define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */
+
+/*
+ * Reserved for IBM SP switch and IBM Next Federation switch.
+ */
+#define LINKTYPE_IBM_SP 145
+#define LINKTYPE_IBM_SN 146
+
+/*
+ * Reserved for private use. If you have some link-layer header type
+ * that you want to use within your organization, with the capture files
+ * using that link-layer header type not ever be sent outside your
+ * organization, you can use these values.
+ *
+ * No libpcap release will use these for any purpose, nor will any
+ * tcpdump release use them, either.
+ *
+ * Do *NOT* use these in capture files that you expect anybody not using
+ * your private versions of capture-file-reading tools to read; in
+ * particular, do *NOT* use them in products, otherwise you may find that
+ * people won't be able to use tcpdump, or snort, or Ethereal, or... to
+ * read capture files from your firewall/intrusion detection/traffic
+ * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value,
+ * and you may also find that the developers of those applications will
+ * not accept patches to let them read those files.
+ *
+ * Also, do not use them if somebody might send you a capture using them
+ * for *their* private type and tools using them for *your* private type
+ * would have to read them.
+ *
+ * Instead, in those cases, ask "tcpdump-workers@tcpdump.org" for a new DLT_
+ * and LINKTYPE_ value, as per the comment in pcap-bpf.h, and use the type
+ * you're given.
+ */
+#define LINKTYPE_USER0 147
+#define LINKTYPE_USER1 148
+#define LINKTYPE_USER2 149
+#define LINKTYPE_USER3 150
+#define LINKTYPE_USER4 151
+#define LINKTYPE_USER5 152
+#define LINKTYPE_USER6 153
+#define LINKTYPE_USER7 154
+#define LINKTYPE_USER8 155
+#define LINKTYPE_USER9 156
+#define LINKTYPE_USER10 157
+#define LINKTYPE_USER11 158
+#define LINKTYPE_USER12 159
+#define LINKTYPE_USER13 160
+#define LINKTYPE_USER14 161
+#define LINKTYPE_USER15 162
+
+/*
+ * For future use with 802.11 captures - defined by AbsoluteValue
+ * Systems to store a number of bits of link-layer information
+ * including radio information:
+ *
+ * http://www.shaftnet.org/~pizza/software/capturefrm.txt
+ *
+ * but could and arguably should also be used by non-AVS Linux
+ * 802.11 drivers; that may happen in the future.
+ */
+#define LINKTYPE_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */
+
+/*
+ * Juniper-private data link type, as per request from
+ * Hannes Gredler <hannes@juniper.net>. The corresponding
+ * DLT_s are used for passing on chassis-internal
+ * metainformation such as QOS profiles, etc..
+ */
+#define LINKTYPE_JUNIPER_MONITOR 164
+
+/*
+ * Reserved for BACnet MS/TP.
+ */
+#define LINKTYPE_BACNET_MS_TP 165
+
+/*
+ * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>.
+ *
+ * This is used in some OSes to allow a kernel socket filter to distinguish
+ * between incoming and outgoing packets, on a socket intended to
+ * supply pppd with outgoing packets so it can do dial-on-demand and
+ * hangup-on-lack-of-demand; incoming packets are filtered out so they
+ * don't cause pppd to hold the connection up (you don't want random
+ * input packets such as port scans, packets from old lost connections,
+ * etc. to force the connection to stay up).
+ *
+ * The first byte of the PPP header (0xff03) is modified to accomodate
+ * the direction - 0x00 = IN, 0x01 = OUT.
+ */
+#define LINKTYPE_PPP_PPPD 166
+
+/*
+ * Juniper-private data link type, as per request from
+ * Hannes Gredler <hannes@juniper.net>. The DLT_s are used
+ * for passing on chassis-internal metainformation such as
+ * QOS profiles, cookies, etc..
+ */
+#define LINKTYPE_JUNIPER_PPPOE 167
+#define LINKTYPE_JUNIPER_PPPOE_ATM 168
+
+#define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */
+#define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */
+#define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */
+
+/*
+ * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line
+ * monitoring equipment.
+ */
+#define LINKTYPE_GCOM_T1E1 172
+#define LINKTYPE_GCOM_SERIAL 173
+
+/*
+ * Juniper-private data link type, as per request from
+ * Hannes Gredler <hannes@juniper.net>. The DLT_ is used
+ * for internal communication to Physical Interface Cards (PIC)
+ */
+#define LINKTYPE_JUNIPER_PIC_PEER 174
+
+/*
+ * Link types requested by Gregor Maier <gregor@endace.com> of Endace
+ * Measurement Systems. They add an ERF header (see
+ * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of
+ * the link-layer header.
+ */
+#define LINKTYPE_ERF_ETH 175 /* Ethernet */
+#define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */
+
+/*
+ * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD
+ * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header
+ * includes additional information before the LAPD header, so it's
+ * not necessarily a generic LAPD header.
+ */
+#define LINKTYPE_LINUX_LAPD 177
+
+/*
+ * Juniper-private data link type, as per request from
+ * Hannes Gredler <hannes@juniper.net>.
+ * The Link Types are used for prepending meta-information
+ * like interface index, interface name
+ * before standard Ethernet, PPP, Frelay & C-HDLC Frames
+ */
+#define LINKTYPE_JUNIPER_ETHER 178
+#define LINKTYPE_JUNIPER_PPP 179
+#define LINKTYPE_JUNIPER_FRELAY 180
+#define LINKTYPE_JUNIPER_CHDLC 181
+
+/*
+ * Multi Link Frame Relay (FRF.16)
+ */
+#define LINKTYPE_MFR 182
+
+/*
+ * Juniper-private data link type, as per request from
+ * Hannes Gredler <hannes@juniper.net>.
+ * The DLT_ is used for internal communication with a
+ * voice Adapter Card (PIC)
+ */
+#define LINKTYPE_JUNIPER_VP 183
+
+/*
+ * Arinc 429 frames.
+ * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
+ * Every frame contains a 32bit A429 label.
+ * More documentation on Arinc 429 can be found at
+ * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf
+ */
+#define LINKTYPE_A429 184
+
+/*
+ * Arinc 653 Interpartition Communication messages.
+ * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
+ * Please refer to the A653-1 standard for more information.
+ */
+#define LINKTYPE_A653_ICM 185
+
+/*
+ * USB packets, beginning with a USB setup header; requested by
+ * Paolo Abeni <paolo.abeni@email.it>.
+ */
+#define LINKTYPE_USB 186
+
+/*
+ * Bluetooth HCI UART transport layer (part H:4); requested by
+ * Paolo Abeni.
+ */
+#define LINKTYPE_BLUETOOTH_HCI_H4 187
+
+/*
+ * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz
+ * <cruz_petagay@bah.com>.
+ */
+#define LINKTYPE_IEEE802_16_MAC_CPS 188
+
+/*
+ * USB packets, beginning with a Linux USB header; requested by
+ * Paolo Abeni <paolo.abeni@email.it>.
+ */
+#define LINKTYPE_USB_LINUX 189
+
+/*
+ * Controller Area Network (CAN) v. 2.0B packets.
+ * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
+ * Used to dump CAN packets coming from a CAN Vector board.
+ * More documentation on the CAN v2.0B frames can be found at
+ * http://www.can-cia.org/downloads/?269
+ */
+#define LINKTYPE_CAN20B 190
+
+/*
+ * IEEE 802.15.4, with address fields padded, as is done by Linux
+ * drivers; requested by Juergen Schimmer.
+ */
+#define LINKTYPE_IEEE802_15_4_LINUX 191
+
+/*
+ * Per Packet Information encapsulated packets.
+ * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>.
+ */
+#define LINKTYPE_PPI 192
+
+/*
+ * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header;
+ * requested by Charles Clancy.
+ */
+#define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193
+
+/*
+ * Juniper-private data link type, as per request from
+ * Hannes Gredler <hannes@juniper.net>.
+ * The DLT_ is used for internal communication with a
+ * integrated service module (ISM).
+ */
+#define LINKTYPE_JUNIPER_ISM 194
+
+/*
+ * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
+ * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>.
+ */
+#define LINKTYPE_IEEE802_15_4 195
+
+/*
+ * Various link-layer types, with a pseudo-header, for SITA
+ * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com).
+ */
+#define LINKTYPE_SITA 196
+
+/*
+ * Various link-layer types, with a pseudo-header, for Endace DAG cards;
+ * encapsulates Endace ERF records. Requested by Stephen Donnelly
+ * <stephen@endace.com>.
+ */
+#define LINKTYPE_ERF 197
+
+/*
+ * Special header prepended to Ethernet packets when capturing from a
+ * u10 Networks board. Requested by Phil Mulholland
+ * <phil@u10networks.com>.
+ */
+#define LINKTYPE_RAIF1 198
+
+/*
+ * IPMB packet for IPMI, beginning with the I2C slave address, followed
+ * by the netFn and LUN, etc.. Requested by Chanthy Toeung
+ * <chanthy.toeung@ca.kontron.com>.
+ */
+#define LINKTYPE_IPMB 199
+
+
+static struct linktype_map {
+ int dlt;
+ int linktype;
+} map[] = {
+ /*
+ * These DLT_* codes have LINKTYPE_* codes with values identical
+ * to the values of the corresponding DLT_* code.
+ */
+ { DLT_NULL, LINKTYPE_NULL },
+ { DLT_EN10MB, LINKTYPE_ETHERNET },
+ { DLT_EN3MB, LINKTYPE_EXP_ETHERNET },
+ { DLT_AX25, LINKTYPE_AX25 },
+ { DLT_PRONET, LINKTYPE_PRONET },
+ { DLT_CHAOS, LINKTYPE_CHAOS },
+ { DLT_IEEE802, LINKTYPE_TOKEN_RING },
+ { DLT_ARCNET, LINKTYPE_ARCNET },
+ { DLT_SLIP, LINKTYPE_SLIP },
+ { DLT_PPP, LINKTYPE_PPP },
+ { DLT_FDDI, LINKTYPE_FDDI },
+
+ /*
+ * These DLT_* codes have different values on different
+ * platforms; we map them to LINKTYPE_* codes that
+ * have values that should never be equal to any DLT_*
+ * code.
+ */
+#ifdef DLT_FR
+ /* BSD/OS Frame Relay */
+ { DLT_FR, LINKTYPE_FRELAY },
+#endif
+
+ { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL },
+ { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 },
+ { DLT_RAW, LINKTYPE_RAW },
+ { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS },
+ { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS },
+
+ /* BSD/OS Cisco HDLC */
+ { DLT_C_HDLC, LINKTYPE_C_HDLC },
+
+ /*
+ * These DLT_* codes are not on all platforms, but, so far,
+ * there don't appear to be any platforms that define
+ * other codes with those values; we map them to
+ * different LINKTYPE_* values anyway, just in case.
+ */
+
+ /* Linux ATM Classical IP */
+ { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP },
+
+ /* NetBSD sync/async serial PPP (or Cisco HDLC) */
+ { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC },
+
+ /* NetBSD PPP over Ethernet */
+ { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER },
+
+ /* IEEE 802.11 wireless */
+ { DLT_IEEE802_11, LINKTYPE_IEEE802_11 },
+
+ /* Frame Relay */
+ { DLT_FRELAY, LINKTYPE_FRELAY },
+
+ /* OpenBSD loopback */
+ { DLT_LOOP, LINKTYPE_LOOP },
+
+ /* Linux cooked socket capture */
+ { DLT_LINUX_SLL, LINKTYPE_LINUX_SLL },
+
+ /* Apple LocalTalk hardware */
+ { DLT_LTALK, LINKTYPE_LTALK },
+
+ /* Acorn Econet */
+ { DLT_ECONET, LINKTYPE_ECONET },
+
+ /* OpenBSD DLT_PFLOG */
+ { DLT_PFLOG, LINKTYPE_PFLOG },
+
+ /* For Cisco-internal use */
+ { DLT_CISCO_IOS, LINKTYPE_CISCO_IOS },
+
+ /* Prism II monitor-mode header plus 802.11 header */
+ { DLT_PRISM_HEADER, LINKTYPE_PRISM_HEADER },
+
+ /* FreeBSD Aironet driver stuff */
+ { DLT_AIRONET_HEADER, LINKTYPE_AIRONET_HEADER },
+
+ /* Siemens HiPath HDLC */
+ { DLT_HHDLC, LINKTYPE_HHDLC },
+
+ /* RFC 2625 IP-over-Fibre Channel */
+ { DLT_IP_OVER_FC, LINKTYPE_IP_OVER_FC },
+
+ /* Solaris+SunATM */
+ { DLT_SUNATM, LINKTYPE_SUNATM },
+
+ /* RapidIO */
+ { DLT_RIO, LINKTYPE_RIO },
+
+ /* PCI Express */
+ { DLT_PCI_EXP, LINKTYPE_PCI_EXP },
+
+ /* Xilinx Aurora link layer */
+ { DLT_AURORA, LINKTYPE_AURORA },
+
+ /* 802.11 plus BSD radio header */
+ { DLT_IEEE802_11_RADIO, LINKTYPE_IEEE802_11_RADIO },
+
+ /* Tazmen Sniffer Protocol */
+ { DLT_TZSP, LINKTYPE_TZSP },
+
+ /* Arcnet with Linux-style link-layer headers */
+ { DLT_ARCNET_LINUX, LINKTYPE_ARCNET_LINUX },
+
+ /* Juniper-internal chassis encapsulation */
+ { DLT_JUNIPER_MLPPP, LINKTYPE_JUNIPER_MLPPP },
+ { DLT_JUNIPER_MLFR, LINKTYPE_JUNIPER_MLFR },
+ { DLT_JUNIPER_ES, LINKTYPE_JUNIPER_ES },
+ { DLT_JUNIPER_GGSN, LINKTYPE_JUNIPER_GGSN },
+ { DLT_JUNIPER_MFR, LINKTYPE_JUNIPER_MFR },
+ { DLT_JUNIPER_ATM2, LINKTYPE_JUNIPER_ATM2 },
+ { DLT_JUNIPER_SERVICES, LINKTYPE_JUNIPER_SERVICES },
+ { DLT_JUNIPER_ATM1, LINKTYPE_JUNIPER_ATM1 },
+
+ /* Apple IP-over-IEEE 1394 cooked header */
+ { DLT_APPLE_IP_OVER_IEEE1394, LINKTYPE_APPLE_IP_OVER_IEEE1394 },
+
+ /* SS7 */
+ { DLT_MTP2_WITH_PHDR, LINKTYPE_MTP2_WITH_PHDR },
+ { DLT_MTP2, LINKTYPE_MTP2 },
+ { DLT_MTP3, LINKTYPE_MTP3 },
+ { DLT_SCCP, LINKTYPE_SCCP },
+
+ /* DOCSIS MAC frames */
+ { DLT_DOCSIS, LINKTYPE_DOCSIS },
+
+ /* IrDA IrLAP packets + Linux-cooked header */
+ { DLT_LINUX_IRDA, LINKTYPE_LINUX_IRDA },
+
+ /* IBM SP and Next Federation switches */
+ { DLT_IBM_SP, LINKTYPE_IBM_SP },
+ { DLT_IBM_SN, LINKTYPE_IBM_SN },
+
+ /* 802.11 plus AVS radio header */
+ { DLT_IEEE802_11_RADIO_AVS, LINKTYPE_IEEE802_11_RADIO_AVS },
+
+ /*
+ * Any platform that defines additional DLT_* codes should:
+ *
+ * request a LINKTYPE_* code and value from tcpdump.org,
+ * as per the above;
+ *
+ * add, in their version of libpcap, an entry to map
+ * those DLT_* codes to the corresponding LINKTYPE_*
+ * code;
+ *
+ * redefine, in their "net/bpf.h", any DLT_* values
+ * that collide with the values used by their additional
+ * DLT_* codes, to remove those collisions (but without
+ * making them collide with any of the LINKTYPE_*
+ * values equal to 50 or above; they should also avoid
+ * defining DLT_* values that collide with those
+ * LINKTYPE_* values, either).
+ */
+
+ /* Juniper-internal chassis encapsulation */
+ { DLT_JUNIPER_MONITOR, LINKTYPE_JUNIPER_MONITOR },
+
+ /* BACnet MS/TP */
+ { DLT_BACNET_MS_TP, LINKTYPE_BACNET_MS_TP },
+
+ /* PPP for pppd, with direction flag in the PPP header */
+ { DLT_PPP_PPPD, LINKTYPE_PPP_PPPD},
+
+ /* Juniper-internal chassis encapsulation */
+ { DLT_JUNIPER_PPPOE, LINKTYPE_JUNIPER_PPPOE },
+ { DLT_JUNIPER_PPPOE_ATM,LINKTYPE_JUNIPER_PPPOE_ATM },
+
+ /* GPRS LLC */
+ { DLT_GPRS_LLC, LINKTYPE_GPRS_LLC },
+
+ /* Transparent Generic Framing Procedure (ITU-T G.7041/Y.1303) */
+ { DLT_GPF_T, LINKTYPE_GPF_T },
+
+ /* Framed Generic Framing Procedure (ITU-T G.7041/Y.1303) */
+ { DLT_GPF_F, LINKTYPE_GPF_F },
+
+ { DLT_GCOM_T1E1, LINKTYPE_GCOM_T1E1 },
+ { DLT_GCOM_SERIAL, LINKTYPE_GCOM_SERIAL },
+
+ /* Juniper-internal chassis encapsulation */
+ { DLT_JUNIPER_PIC_PEER, LINKTYPE_JUNIPER_PIC_PEER },
+
+ /* Endace types */
+ { DLT_ERF_ETH, LINKTYPE_ERF_ETH },
+ { DLT_ERF_POS, LINKTYPE_ERF_POS },
+
+ /* viSDN LAPD */
+ { DLT_LINUX_LAPD, LINKTYPE_LINUX_LAPD },
+
+ /* Juniper meta-information before Ether, PPP, Frame Relay, C-HDLC Frames */
+ { DLT_JUNIPER_ETHER, LINKTYPE_JUNIPER_ETHER },
+ { DLT_JUNIPER_PPP, LINKTYPE_JUNIPER_PPP },
+ { DLT_JUNIPER_FRELAY, LINKTYPE_JUNIPER_FRELAY },
+ { DLT_JUNIPER_CHDLC, LINKTYPE_JUNIPER_CHDLC },
+
+ /* Multi Link Frame Relay (FRF.16) */
+ { DLT_MFR, LINKTYPE_MFR },
+
+ /* Juniper Voice PIC */
+ { DLT_JUNIPER_VP, LINKTYPE_JUNIPER_VP },
+
+ /* Controller Area Network (CAN) v2.0B */
+ { DLT_A429, LINKTYPE_A429 },
+
+ /* Arinc 653 Interpartition Communication messages */
+ { DLT_A653_ICM, LINKTYPE_A653_ICM },
+
+ /* USB */
+ { DLT_USB, LINKTYPE_USB },
+
+ /* Bluetooth HCI UART transport layer */
+ { DLT_BLUETOOTH_HCI_H4, LINKTYPE_BLUETOOTH_HCI_H4 },
+
+ /* IEEE 802.16 MAC Common Part Sublayer */
+ { DLT_IEEE802_16_MAC_CPS, LINKTYPE_IEEE802_16_MAC_CPS },
+
+ /* USB with Linux header */
+ { DLT_USB_LINUX, LINKTYPE_USB_LINUX },
+
+ /* Controller Area Network (CAN) v2.0B */
+ { DLT_CAN20B, LINKTYPE_CAN20B },
+
+ /* IEEE 802.15.4 with address fields padded */
+ { DLT_IEEE802_15_4_LINUX, LINKTYPE_IEEE802_15_4_LINUX },
+
+ /* Per Packet Information encapsulated packets */
+ { DLT_PPI, LINKTYPE_PPI },
+
+ /* IEEE 802.16 MAC Common Part Sublayer plus radiotap header */
+ { DLT_IEEE802_16_MAC_CPS_RADIO, LINKTYPE_IEEE802_16_MAC_CPS_RADIO },
+
+ /* Juniper Voice ISM */
+ { DLT_JUNIPER_ISM, LINKTYPE_JUNIPER_ISM },
+
+ /* IEEE 802.15.4 exactly as it appears in the spec */
+ { DLT_IEEE802_15_4, LINKTYPE_IEEE802_15_4 },
+
+ /* Various link-layer types for SITA */
+ { DLT_SITA, LINKTYPE_SITA },
+
+ /* Various link-layer types for Endace */
+ { DLT_ERF, LINKTYPE_ERF },
+
+ /* Special header for u10 Networks boards */
+ { DLT_RAIF1, LINKTYPE_RAIF1 },
+
+ /* IPMB */
+ { DLT_IPMB, LINKTYPE_IPMB },
+
+ { -1, -1 }
+};
+
+static int
+dlt_to_linktype(int dlt)
+{
+ int i;
+
+ for (i = 0; map[i].dlt != -1; i++) {
+ if (map[i].dlt == dlt)
+ return (map[i].linktype);
+ }
+
+ /*
+ * If we don't have a mapping for this DLT_ code, return an
+ * error; that means that the table above needs to have an
+ * entry added.
+ */
+ return (-1);
+}
+
+static int
+linktype_to_dlt(int linktype)
+{
+ int i;
+
+ for (i = 0; map[i].linktype != -1; i++) {
+ if (map[i].linktype == linktype)
+ return (map[i].dlt);
+ }
+
+ /*
+ * If we don't have an entry for this link type, return
+ * the link type value; it may be a DLT_ value from an
+ * older version of libpcap.
+ */
+ return linktype;
+}
+
+static int
+sf_write_header(FILE *fp, int linktype, int thiszone, int snaplen)
+{
+ struct pcap_file_header hdr;
+
+ hdr.magic = TCPDUMP_MAGIC;
+ hdr.version_major = PCAP_VERSION_MAJOR;
+ hdr.version_minor = PCAP_VERSION_MINOR;
+
+ hdr.thiszone = thiszone;
+ hdr.snaplen = snaplen;
+ hdr.sigfigs = 0;
+ hdr.linktype = linktype;
+
+ if (fwrite((char *)&hdr, sizeof(hdr), 1, fp) != 1)
+ return (-1);
+
+ return (0);
+}
+
+static void
+swap_hdr(struct pcap_file_header *hp)
+{
+ hp->version_major = SWAPSHORT(hp->version_major);
+ hp->version_minor = SWAPSHORT(hp->version_minor);
+ hp->thiszone = SWAPLONG(hp->thiszone);
+ hp->sigfigs = SWAPLONG(hp->sigfigs);
+ hp->snaplen = SWAPLONG(hp->snaplen);
+ hp->linktype = SWAPLONG(hp->linktype);
+}
+
+static int
+sf_getnonblock(pcap_t *p, char *errbuf)
+{
+ /*
+ * This is a savefile, not a live capture file, so never say
+ * it's in non-blocking mode.
+ */
+ return (0);
+}
+
+static int
+sf_setnonblock(pcap_t *p, int nonblock, char *errbuf)
+{
+ /*
+ * This is a savefile, not a live capture file, so ignore
+ * requests to put it in non-blocking mode.
+ */
+ return (0);
+}
+
+static int
+sf_stats(pcap_t *p, struct pcap_stat *ps)
+{
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "Statistics aren't available from savefiles");
+ return (-1);
+}
+
+static int
+sf_inject(pcap_t *p, const void *buf _U_, size_t size _U_)
+{
+ strlcpy(p->errbuf, "Sending packets isn't supported on savefiles",
+ PCAP_ERRBUF_SIZE);
+ return (-1);
+}
+
+/*
+ * Set direction flag: Which packets do we accept on a forwarding
+ * single device? IN, OUT or both?
+ */
+static int
+sf_setdirection(pcap_t *p, pcap_direction_t d)
+{
+ snprintf(p->errbuf, sizeof(p->errbuf),
+ "Setting direction is not supported on savefiles");
+ return (-1);
+}
+
+static void
+sf_close(pcap_t *p)
+{
+ if (p->sf.rfile != stdin)
+ (void)fclose(p->sf.rfile);
+ if (p->sf.base != NULL)
+ free(p->sf.base);
+}
+
+pcap_t *
+pcap_open_offline(const char *fname, char *errbuf)
+{
+ FILE *fp;
+ pcap_t *p;
+
+ if (fname[0] == '-' && fname[1] == '\0')
+ {
+ fp = stdin;
+#if defined(WIN32) || defined(MSDOS)
+ /*
+ * We're reading from the standard input, so put it in binary
+ * mode, as savefiles are binary files.
+ */
+ SET_BINMODE(fp);
+#endif
+ }
+ else {
+#if !defined(WIN32) && !defined(MSDOS)
+ fp = fopen(fname, "r");
+#else
+ fp = fopen(fname, "rb");
+#endif
+ if (fp == NULL) {
+ snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", fname,
+ pcap_strerror(errno));
+ return (NULL);
+ }
+ }
+ p = pcap_fopen_offline(fp, errbuf);
+ if (p == NULL) {
+ if (fp != stdin)
+ fclose(fp);
+ }
+ return (p);
+}
+
+pcap_t *
+pcap_fopen_offline(FILE *fp, char *errbuf)
+{
+ register pcap_t *p;
+ struct pcap_file_header hdr;
+ size_t amt_read;
+ bpf_u_int32 magic;
+ int linklen;
+
+ p = (pcap_t *)malloc(sizeof(*p));
+ if (p == NULL) {
+ strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE);
+ return (NULL);
+ }
+
+ memset((char *)p, 0, sizeof(*p));
+
+ amt_read = fread((char *)&hdr, 1, sizeof(hdr), fp);
+ if (amt_read != sizeof(hdr)) {
+ if (ferror(fp)) {
+ snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "error reading dump file: %s",
+ pcap_strerror(errno));
+ } else {
+ snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "truncated dump file; tried to read %lu file header bytes, only got %lu",
+ (unsigned long)sizeof(hdr),
+ (unsigned long)amt_read);
+ }
+ goto bad;
+ }
+ magic = hdr.magic;
+ if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) {
+ magic = SWAPLONG(magic);
+ if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) {
+ snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "bad dump file format");
+ goto bad;
+ }
+ p->sf.swapped = 1;
+ swap_hdr(&hdr);
+ }
+ if (magic == KUZNETZOV_TCPDUMP_MAGIC) {
+ /*
+ * XXX - the patch that's in some versions of libpcap
+ * changes the packet header but not the magic number,
+ * and some other versions with this magic number have
+ * some extra debugging information in the packet header;
+ * we'd have to use some hacks^H^H^H^H^Hheuristics to
+ * detect those variants.
+ *
+ * Ethereal does that, but it does so by trying to read
+ * the first two packets of the file with each of the
+ * record header formats. That currently means it seeks
+ * backwards and retries the reads, which doesn't work
+ * on pipes. We want to be able to read from a pipe, so
+ * that strategy won't work; we'd have to buffer some
+ * data ourselves and read from that buffer in order to
+ * make that work.
+ */
+ p->sf.hdrsize = sizeof(struct pcap_sf_patched_pkthdr);
+ } else
+ p->sf.hdrsize = sizeof(struct pcap_sf_pkthdr);
+ if (hdr.version_major < PCAP_VERSION_MAJOR) {
+ snprintf(errbuf, PCAP_ERRBUF_SIZE, "archaic file format");
+ goto bad;
+ }
+ p->tzoff = hdr.thiszone;
+ p->snapshot = hdr.snaplen;
+ p->linktype = linktype_to_dlt(hdr.linktype);
+ if (magic == KUZNETZOV_TCPDUMP_MAGIC && p->linktype == DLT_EN10MB) {
+ /*
+ * This capture might have been done in raw mode or cooked
+ * mode.
+ *
+ * If it was done in cooked mode, p->snapshot was passed
+ * to recvfrom() as the buffer size, meaning that the
+ * most packet data that would be copied would be
+ * p->snapshot. However, a faked Ethernet header would
+ * then have been added to it, so the most data that would
+ * be in a packet in the file would be p->snapshot + 14.
+ *
+ * We can't easily tell whether the capture was done in
+ * raw mode or cooked mode, so we'll assume it was
+ * cooked mode, and add 14 to the snapshot length. That
+ * means that, for a raw capture, the snapshot length will
+ * be misleading if you use it to figure out why a capture
+ * doesn't have all the packet data, but there's not much
+ * we can do to avoid that.
+ */
+ p->snapshot += 14;
+ }
+ p->sf.rfile = fp;
+#ifndef WIN32
+ p->bufsize = hdr.snaplen;
+#else
+ /* Allocate the space for pcap_pkthdr as well. It will be used by pcap_read_ex */
+ p->bufsize = hdr.snaplen+sizeof(struct pcap_pkthdr);
+#endif
+
+ /* Align link header as required for proper data alignment */
+ /* XXX should handle all types */
+ switch (p->linktype) {
+
+ case DLT_EN10MB:
+ linklen = 14;
+ break;
+
+ case DLT_FDDI:
+ linklen = 13 + 8; /* fddi_header + llc */
+ break;
+
+ case DLT_NULL:
+ default:
+ linklen = 0;
+ break;
+ }
+
+ if (p->bufsize < 0)
+ p->bufsize = BPF_MAXBUFSIZE;
+ p->sf.base = (u_char *)malloc(p->bufsize + BPF_ALIGNMENT);
+ if (p->sf.base == NULL) {
+ strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE);
+ goto bad;
+ }
+ p->buffer = p->sf.base + BPF_ALIGNMENT - (linklen % BPF_ALIGNMENT);
+ p->sf.version_major = hdr.version_major;
+ p->sf.version_minor = hdr.version_minor;
+#ifdef PCAP_FDDIPAD
+ /* Padding only needed for live capture fcode */
+ p->fddipad = 0;
+#endif
+
+ /*
+ * We interchanged the caplen and len fields at version 2.3,
+ * in order to match the bpf header layout. But unfortunately
+ * some files were written with version 2.3 in their headers
+ * but without the interchanged fields.
+ *
+ * In addition, DG/UX tcpdump writes out files with a version
+ * number of 543.0, and with the caplen and len fields in the
+ * pre-2.3 order.
+ */
+ switch (hdr.version_major) {
+
+ case 2:
+ if (hdr.version_minor < 3)
+ p->sf.lengths_swapped = SWAPPED;
+ else if (hdr.version_minor == 3)
+ p->sf.lengths_swapped = MAYBE_SWAPPED;
+ else
+ p->sf.lengths_swapped = NOT_SWAPPED;
+ break;
+
+ case 543:
+ p->sf.lengths_swapped = SWAPPED;
+ break;
+
+ default:
+ p->sf.lengths_swapped = NOT_SWAPPED;
+ break;
+ }
+
+#if !defined(WIN32) && !defined(MSDOS)
+ /*
+ * You can do "select()" and "poll()" on plain files on most
+ * platforms, and should be able to do so on pipes.
+ *
+ * You can't do "select()" on anything other than sockets in
+ * Windows, so, on Win32 systems, we don't have "selectable_fd".
+ */
+ p->selectable_fd = fileno(fp);
+#endif
+
+ p->read_op = pcap_offline_read;
+ p->inject_op = sf_inject;
+ p->setfilter_op = install_bpf_program;
+ p->setdirection_op = sf_setdirection;
+ p->set_datalink_op = NULL; /* we don't support munging link-layer headers */
+ p->getnonblock_op = sf_getnonblock;
+ p->setnonblock_op = sf_setnonblock;
+ p->stats_op = sf_stats;
+ p->close_op = sf_close;
+
+ return (p);
+ bad:
+ free(p);
+ return (NULL);
+}
+
+/*
+ * Read sf_readfile and return the next packet. Return the header in hdr
+ * and the contents in buf. Return 0 on success, SFERR_EOF if there were
+ * no more packets, and SFERR_TRUNC if a partial packet was encountered.
+ */
+static int
+sf_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char *buf, u_int buflen)
+{
+ struct pcap_sf_patched_pkthdr sf_hdr;
+ FILE *fp = p->sf.rfile;
+ size_t amt_read;
+ bpf_u_int32 t;
+
+ /*
+ * Read the packet header; the structure we use as a buffer
+ * is the longer structure for files generated by the patched
+ * libpcap, but if the file has the magic number for an
+ * unpatched libpcap we only read as many bytes as the regular
+ * header has.
+ */
+ amt_read = fread(&sf_hdr, 1, p->sf.hdrsize, fp);
+ if (amt_read != p->sf.hdrsize) {
+ if (ferror(fp)) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "error reading dump file: %s",
+ pcap_strerror(errno));
+ return (-1);
+ } else {
+ if (amt_read != 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "truncated dump file; tried to read %d header bytes, only got %lu",
+ p->sf.hdrsize, (unsigned long)amt_read);
+ return (-1);
+ }
+ /* EOF */
+ return (1);
+ }
+ }
+
+ if (p->sf.swapped) {
+ /* these were written in opposite byte order */
+ hdr->caplen = SWAPLONG(sf_hdr.caplen);
+ hdr->len = SWAPLONG(sf_hdr.len);
+ hdr->ts.tv_sec = SWAPLONG(sf_hdr.ts.tv_sec);
+ hdr->ts.tv_usec = SWAPLONG(sf_hdr.ts.tv_usec);
+ } else {
+ hdr->caplen = sf_hdr.caplen;
+ hdr->len = sf_hdr.len;
+ hdr->ts.tv_sec = sf_hdr.ts.tv_sec;
+ hdr->ts.tv_usec = sf_hdr.ts.tv_usec;
+ }
+ /* Swap the caplen and len fields, if necessary. */
+ switch (p->sf.lengths_swapped) {
+
+ case NOT_SWAPPED:
+ break;
+
+ case MAYBE_SWAPPED:
+ if (hdr->caplen <= hdr->len) {
+ /*
+ * The captured length is <= the actual length,
+ * so presumably they weren't swapped.
+ */
+ break;
+ }
+ /* FALLTHROUGH */
+
+ case SWAPPED:
+ t = hdr->caplen;
+ hdr->caplen = hdr->len;
+ hdr->len = t;
+ break;
+ }
+
+ if (hdr->caplen > buflen) {
+ /*
+ * This can happen due to Solaris 2.3 systems tripping
+ * over the BUFMOD problem and not setting the snapshot
+ * correctly in the savefile header. If the caplen isn't
+ * grossly wrong, try to salvage.
+ */
+ static u_char *tp = NULL;
+ static size_t tsize = 0;
+
+ if (hdr->caplen > 65535) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "bogus savefile header");
+ return (-1);
+ }
+
+ if (tsize < hdr->caplen) {
+ tsize = ((hdr->caplen + 1023) / 1024) * 1024;
+ if (tp != NULL)
+ free((u_char *)tp);
+ tp = (u_char *)malloc(tsize);
+ if (tp == NULL) {
+ tsize = 0;
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "BUFMOD hack malloc");
+ return (-1);
+ }
+ }
+ amt_read = fread((char *)tp, 1, hdr->caplen, fp);
+ if (amt_read != hdr->caplen) {
+ if (ferror(fp)) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "error reading dump file: %s",
+ pcap_strerror(errno));
+ } else {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "truncated dump file; tried to read %u captured bytes, only got %lu",
+ hdr->caplen, (unsigned long)amt_read);
+ }
+ return (-1);
+ }
+ /*
+ * We can only keep up to buflen bytes. Since caplen > buflen
+ * is exactly how we got here, we know we can only keep the
+ * first buflen bytes and must drop the remainder. Adjust
+ * caplen accordingly, so we don't get confused later as
+ * to how many bytes we have to play with.
+ */
+ hdr->caplen = buflen;
+ memcpy((char *)buf, (char *)tp, buflen);
+
+ } else {
+ /* read the packet itself */
+ amt_read = fread((char *)buf, 1, hdr->caplen, fp);
+ if (amt_read != hdr->caplen) {
+ if (ferror(fp)) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "error reading dump file: %s",
+ pcap_strerror(errno));
+ } else {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "truncated dump file; tried to read %u captured bytes, only got %lu",
+ hdr->caplen, (unsigned long)amt_read);
+ }
+ return (-1);
+ }
+ }
+ return (0);
+}
+
+/*
+ * Print out packets stored in the file initialized by sf_read_init().
+ * If cnt > 0, return after 'cnt' packets, otherwise continue until eof.
+ */
+int
+pcap_offline_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
+{
+ struct bpf_insn *fcode;
+ int status = 0;
+ int n = 0;
+
+ while (status == 0) {
+ struct pcap_pkthdr h;
+
+ /*
+ * Has "pcap_breakloop()" been called?
+ * If so, return immediately - if we haven't read any
+ * packets, clear the flag and return -2 to indicate
+ * that we were told to break out of the loop, otherwise
+ * leave the flag set, so that the *next* call will break
+ * out of the loop without having read any packets, and
+ * return the number of packets we've processed so far.
+ */
+ if (p->break_loop) {
+ if (n == 0) {
+ p->break_loop = 0;
+ return (-2);
+ } else
+ return (n);
+ }
+
+ status = sf_next_packet(p, &h, p->buffer, p->bufsize);
+ if (status) {
+ if (status == 1)
+ return (0);
+ return (status);
+ }
+
+ if ((fcode = p->fcode.bf_insns) == NULL ||
+ bpf_filter(fcode, p->buffer, h.len, h.caplen)) {
+ (*callback)(user, &h, p->buffer);
+ if (++n >= cnt && cnt > 0)
+ break;
+ }
+ }
+ /*XXX this breaks semantics tcpslice expects */
+ return (n);
+}
+
+/*
+ * Output a packet to the initialized dump file.
+ */
+void
+pcap_dump(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
+{
+ register FILE *f;
+ struct pcap_sf_pkthdr sf_hdr;
+
+ f = (FILE *)user;
+ sf_hdr.ts.tv_sec = h->ts.tv_sec;
+ sf_hdr.ts.tv_usec = h->ts.tv_usec;
+ sf_hdr.caplen = h->caplen;
+ sf_hdr.len = h->len;
+ /* XXX we should check the return status */
+ (void)fwrite(&sf_hdr, sizeof(sf_hdr), 1, f);
+ (void)fwrite(sp, h->caplen, 1, f);
+}
+
+static pcap_dumper_t *
+pcap_setup_dump(pcap_t *p, int linktype, FILE *f, const char *fname)
+{
+
+#if defined(WIN32) || defined(MSDOS)
+ /*
+ * If we're writing to the standard output, put it in binary
+ * mode, as savefiles are binary files.
+ *
+ * Otherwise, we turn off buffering.
+ * XXX - why? And why not on the standard output?
+ */
+ if (f == stdout)
+ SET_BINMODE(f);
+ else
+ setbuf(f, NULL);
+#endif
+ if (sf_write_header(f, linktype, p->tzoff, p->snapshot) == -1) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't write to %s: %s",
+ fname, pcap_strerror(errno));
+ if (f != stdout)
+ (void)fclose(f);
+ return (NULL);
+ }
+ return ((pcap_dumper_t *)f);
+}
+
+/*
+ * Initialize so that sf_write() will output to the file named 'fname'.
+ */
+pcap_dumper_t *
+pcap_dump_open(pcap_t *p, const char *fname)
+{
+ FILE *f;
+ int linktype;
+
+ linktype = dlt_to_linktype(p->linktype);
+ if (linktype == -1) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "%s: link-layer type %d isn't supported in savefiles",
+ fname, linktype);
+ return (NULL);
+ }
+
+ if (fname[0] == '-' && fname[1] == '\0') {
+ f = stdout;
+ fname = "standard output";
+ } else {
+#if !defined(WIN32) && !defined(MSDOS)
+ f = fopen(fname, "w");
+#else
+ f = fopen(fname, "wb");
+#endif
+ if (f == NULL) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
+ fname, pcap_strerror(errno));
+ return (NULL);
+ }
+ }
+ return (pcap_setup_dump(p, linktype, f, fname));
+}
+
+/*
+ * Initialize so that sf_write() will output to the given stream.
+ */
+pcap_dumper_t *
+pcap_dump_fopen(pcap_t *p, FILE *f)
+{
+ int linktype;
+
+ linktype = dlt_to_linktype(p->linktype);
+ if (linktype == -1) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "stream: link-layer type %d isn't supported in savefiles",
+ linktype);
+ return (NULL);
+ }
+
+ return (pcap_setup_dump(p, linktype, f, "stream"));
+}
+
+FILE *
+pcap_dump_file(pcap_dumper_t *p)
+{
+ return ((FILE *)p);
+}
+
+long
+pcap_dump_ftell(pcap_dumper_t *p)
+{
+ return (ftell((FILE *)p));
+}
+
+int
+pcap_dump_flush(pcap_dumper_t *p)
+{
+
+ if (fflush((FILE *)p) == EOF)
+ return (-1);
+ else
+ return (0);
+}
+
+void
+pcap_dump_close(pcap_dumper_t *p)
+{
+
+#ifdef notyet
+ if (ferror((FILE *)p))
+ return-an-error;
+ /* XXX should check return from fclose() too */
+#endif
+ (void)fclose((FILE *)p);
+}
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