Logo Search packages:      
Sourcecode: nmap version File versions  Download package

savefile.c

/*
 * 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 1.168.2.10 2008-10-06 15:38:39 gianluca 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"
#include "pcap/usb.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@lists.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@lists.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

/*
 * Juniper-private data link type, as per request from
 * Hannes Gredler <hannes@juniper.net>. 
 * The DLT_ is used for capturing data on a secure tunnel interface.
 */
#define LINKTYPE_JUNIPER_ST     200

/*
 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header
 * that includes direction information; requested by Paolo Abeni.
 */
#define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR     201

/*
 * AX.25 packet with a 1-byte KISS header; see
 *
 *    http://www.ax25.net/kiss.htm
 *
 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>.
 */
#define LINKTYPE_AX25_KISS    202

/*
 * LAPD packets from an ISDN channel, starting with the address field,
 * with no pseudo-header.
 * Requested by Varuna De Silva <varunax@gmail.com>.
 */
#define LINKTYPE_LAPD         203

/*
 * Variants of various link-layer headers, with a one-byte direction
 * pseudo-header prepended - zero means "received by this host",
 * non-zero (any non-zero value) means "sent by this host" - as per
 * Will Barker <w.barker@zen.co.uk>.
 */
#define LINKTYPE_PPP_WITH_DIR 204   /* PPP */
#define LINKTYPE_C_HDLC_WITH_DIR 205      /* Cisco HDLC */
#define LINKTYPE_FRELAY_WITH_DIR 206      /* Frame Relay */
#define LINKTYPE_LAPB_WITH_DIR      207   /* LAPB */

/*
 * 208 is reserved for an as-yet-unspecified proprietary link-layer
 * type, as requested by Will Barker.
 */

/*
 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman
 * <avn@pigeonpoint.com>.
 */
#define LINKTYPE_IPMB_LINUX         209

/*
 * FlexRay automotive bus - http://www.flexray.com/ - as requested
 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
 */
#define LINKTYPE_FLEXRAY            210

/*
 * Media Oriented Systems Transport (MOST) bus for multimedia
 * transport - http://www.mostcooperation.com/ - as requested
 * by Hannes Kaelber <hannes.kaelber@x2e.de>.
 */
#define LINKTYPE_MOST               211

/*
 * Local Interconnect Network (LIN) bus for vehicle networks -
 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber
 * <hannes.kaelber@x2e.de>.
 */
#define LINKTYPE_LIN                212

/*
 * X2E-private data link type used for serial line capture,
 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
 */
#define LINKTYPE_X2E_SERIAL         213

/*
 * X2E-private data link type used for the Xoraya data logger
 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>.
 */
#define LINKTYPE_X2E_XORAYA         214

/*
 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no
 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets
 * of 0 as preamble, one octet of SFD, one octet of frame length+
 * reserved bit, and then the MAC-layer data, starting with the
 * frame control field).
 *
 * Requested by Max Filippov <jcmvbkbc@gmail.com>.
 */
#define LINKTYPE_IEEE802_15_4_NONASK_PHY  215


00651 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 },

        /* Juniper Secure Tunnel */
        { DLT_JUNIPER_ST,       LINKTYPE_JUNIPER_ST },

      /* Bluetooth HCI UART transport layer, with pseudo-header */
      { DLT_BLUETOOTH_HCI_H4_WITH_PHDR, LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR },

      /* AX.25 with KISS header */
      { DLT_AX25_KISS,  LINKTYPE_AX25_KISS },

      /* Raw LAPD, with no pseudo-header */
      { DLT_LAPD,       LINKTYPE_LAPD },

      /* PPP with one-byte pseudo-header giving direction */
      { DLT_PPP_WITH_DIR,     LINKTYPE_PPP_WITH_DIR },

      /* Cisco HDLC with one-byte pseudo-header giving direction */
      { DLT_C_HDLC_WITH_DIR,  LINKTYPE_C_HDLC_WITH_DIR },

      /* Frame Relay with one-byte pseudo-header giving direction */
      { DLT_FRELAY_WITH_DIR,  LINKTYPE_FRELAY_WITH_DIR },

      /* LAPB with one-byte pseudo-header giving direction */
      { DLT_LAPB_WITH_DIR,    LINKTYPE_LAPB_WITH_DIR },

      /* IPMB with Linux pseudo-header */
      { DLT_IPMB_LINUX, LINKTYPE_IPMB_LINUX },

      /* FlexRay */
      { DLT_FLEXRAY,          LINKTYPE_FLEXRAY },

      /* MOST */
      { DLT_MOST,       LINKTYPE_MOST },

      /* LIN */
      { DLT_LIN,        LINKTYPE_LIN },

      /* X2E-private serial line capture */
      { DLT_X2E_SERIAL, LINKTYPE_X2E_SERIAL },

      /* X2E-private for Xoraya data logger family */
      { DLT_X2E_XORAYA, LINKTYPE_X2E_XORAYA },

      /* IEEE 802.15.4 with PHY data for non-ASK PHYs */
      { DLT_IEEE802_15_4_NONASK_PHY, LINKTYPE_IEEE802_15_4_NONASK_PHY },

      { -1,             -1 }
};

/*
 * Mechanism for storing information about a capture in the upper
 * 6 bits of a linktype value in a capture file.
 *
 * LT_LINKTYPE_EXT(x) extracts the additional information.
 *
 * The rest of the bits are for a value describing the link-layer
 * value.  LT_LINKTYPE(x) extracts that value.
 */
#define LT_LINKTYPE(x)        ((x) & 0x03FFFFFF)
#define LT_LINKTYPE_EXT(x)    ((x) & 0xFC000000)

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);
}

#ifdef WIN32
static int
sf_setbuff(pcap_t *p, int dim)
{
      snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
          "The kernel buffer size cannot be set while reading from a file");
      return (-1);
}

static int
sf_setmode(pcap_t *p, int mode)
{
      snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
          "impossible to set mode while reading from a file");
      return (-1);
}

static int
sf_setmintocopy(pcap_t *p, int size)
{
      snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
          "The mintocopy parameter cannot be set while reading from a file");
      return (-1);
}
#endif

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_cleanup(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);
}

#ifdef WIN32
pcap_t* pcap_hopen_offline(intptr_t osfd, char *errbuf)
{
      int fd;
      FILE *file;

      fd = _open_osfhandle(osfd, _O_RDONLY);
      if ( fd < 0 ) 
      {
            snprintf(errbuf, PCAP_ERRBUF_SIZE, pcap_strerror(errno));
            return NULL;
      }

      file = _fdopen(fd, "rb");
      if ( file == NULL ) 
      {
            snprintf(errbuf, PCAP_ERRBUF_SIZE, pcap_strerror(errno));
            return NULL;
      }

      return pcap_fopen_offline(file, errbuf);
}
#endif

#ifdef WIN32
static
#endif
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(LT_LINKTYPE(hdr.linktype));
      p->linktype_ext = LT_LINKTYPE_EXT(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;
#ifdef WIN32
      p->setbuff_op = sf_setbuff;
      p->setmode_op = sf_setmode;
      p->setmintocopy_op = sf_setmintocopy;
#endif
      p->cleanup_op = sf_cleanup;
      p->activated = 1;

      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 %lu header bytes, only got %lu",
                            (unsigned long)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);
            }
      }

      /*
       * The DLT_USB_LINUX header is in host byte order when capturing
       * (it's supplied directly from a memory-mapped buffer shared
       * by the kernel).
       *
       * When reading a DLT_USB_LINUX capture file, we need to convert
       * it from the capturing host's byte order to the reading host's
       * byte order.
       */
      if (p->sf.swapped && p->linktype == DLT_USB_LINUX) {
            pcap_usb_header* uhdr = (pcap_usb_header*) buf;
            /*
             * The URB id is a totally opaque value; do we really need to 
             * converte it to the reading host's byte order???
             */
            if (hdr->caplen < 8)
                  return 0;
            uhdr->id = SWAPLL(uhdr->id);
            if (hdr->caplen < 14)
                  return 0;
            uhdr->bus_id = SWAPSHORT(uhdr->bus_id);
            if (hdr->caplen < 24)
                  return 0;
            uhdr->ts_sec = SWAPLL(uhdr->ts_sec);
            if (hdr->caplen < 28)
                  return 0;
            uhdr->ts_usec = SWAPLONG(uhdr->ts_usec);
            if (hdr->caplen < 32)
                  return 0;
            uhdr->status = SWAPLONG(uhdr->status);
            if (hdr->caplen < 36)
                  return 0;
            uhdr->urb_len = SWAPLONG(uhdr->urb_len);
            if (hdr->caplen < 40)
                  return 0;
            uhdr->data_len = SWAPLONG(uhdr->data_len);
      }
      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);
      }
      linktype |= p->linktype_ext;

      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);
      }
      linktype |= p->linktype_ext;

      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);
}

Generated by  Doxygen 1.6.0   Back to index