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Diffstat (limited to 'savefile.c')
-rw-r--r-- | savefile.c | 1493 |
1 files changed, 1493 insertions, 0 deletions
diff --git a/savefile.c b/savefile.c new file mode 100644 index 0000000..e5a5403 --- /dev/null +++ b/savefile.c @@ -0,0 +1,1493 @@ +/* + * 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); +} |