1/* 2 * Copyright (c) 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * savefile.c - supports offline use of tcpdump 22 * Extraction/creation by Jeffrey Mogul, DECWRL 23 * Modified by Steve McCanne, LBL. 24 * 25 * Used to save the received packet headers, after filtering, to 26 * a file, and then read them later. 27 * The first record in the file contains saved values for the machine 28 * dependent values so we can print the dump file on any architecture. 29 */ 30 31#ifndef lint 32static const char rcsid[] _U_ = 33 "@(#) $Header: /tcpdump/master/libpcap/savefile.c,v 1.126.2.17 2006/07/27 21:06:18 gianluca Exp $ (LBL)"; 34#endif 35 36#ifdef HAVE_CONFIG_H 37#include "config.h" 38#endif 39 40#include <errno.h> 41#include <memory.h> 42#include <stdio.h> 43#include <stdlib.h> 44#include <string.h> 45 46#include "pcap-int.h" 47 48#ifdef HAVE_OS_PROTO_H 49#include "os-proto.h" 50#endif 51 52/* 53 * Standard libpcap format. 54 */ 55#define TCPDUMP_MAGIC 0xa1b2c3d4 56 57/* 58 * Alexey Kuznetzov's modified libpcap format. 59 */ 60#define KUZNETZOV_TCPDUMP_MAGIC 0xa1b2cd34 61 62/* 63 * Reserved for Francisco Mesquita <francisco.mesquita@radiomovel.pt> 64 * for another modified format. 65 */ 66#define FMESQUITA_TCPDUMP_MAGIC 0xa1b234cd 67 68/* 69 * Navtel Communcations' format, with nanosecond timestamps, 70 * as per a request from Dumas Hwang <dumas.hwang@navtelcom.com>. 71 */ 72#define NAVTEL_TCPDUMP_MAGIC 0xa12b3c4d 73 74/* 75 * Normal libpcap format, except for seconds/nanoseconds timestamps, 76 * as per a request by Ulf Lamping <ulf.lamping@web.de> 77 */ 78#define NSEC_TCPDUMP_MAGIC 0xa1b23c4d 79 80/* 81 * We use the "receiver-makes-right" approach to byte order, 82 * because time is at a premium when we are writing the file. 83 * In other words, the pcap_file_header and pcap_pkthdr, 84 * records are written in host byte order. 85 * Note that the bytes of packet data are written out in the order in 86 * which they were received, so multi-byte fields in packets are not 87 * written in host byte order, they're written in whatever order the 88 * sending machine put them in. 89 * 90 * ntoh[ls] aren't sufficient because we might need to swap on a big-endian 91 * machine (if the file was written in little-end order). 92 */ 93#define SWAPLONG(y) \ 94((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff)) 95#define SWAPSHORT(y) \ 96 ( (((y)&0xff)<<8) | ((u_short)((y)&0xff00)>>8) ) 97 98#define SFERR_TRUNC 1 99#define SFERR_BADVERSION 2 100#define SFERR_BADF 3 101#define SFERR_EOF 4 /* not really an error, just a status */ 102 103/* 104 * Setting O_BINARY on DOS/Windows is a bit tricky 105 */ 106#if defined(WIN32) 107 #define SET_BINMODE(f) _setmode(_fileno(f), _O_BINARY) 108#elif defined(MSDOS) 109 #if defined(__HIGHC__) 110 #define SET_BINMODE(f) setmode(f, O_BINARY) 111 #else 112 #define SET_BINMODE(f) setmode(fileno(f), O_BINARY) 113 #endif 114#endif 115 116/* 117 * We don't write DLT_* values to the capture file header, because 118 * they're not the same on all platforms. 119 * 120 * Unfortunately, the various flavors of BSD have not always used the same 121 * numerical values for the same data types, and various patches to 122 * libpcap for non-BSD OSes have added their own DLT_* codes for link 123 * layer encapsulation types seen on those OSes, and those codes have had, 124 * in some cases, values that were also used, on other platforms, for other 125 * link layer encapsulation types. 126 * 127 * This means that capture files of a type whose numerical DLT_* code 128 * means different things on different BSDs, or with different versions 129 * of libpcap, can't always be read on systems other than those like 130 * the one running on the machine on which the capture was made. 131 * 132 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes 133 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* 134 * codes to DLT_* codes when reading a savefile header. 135 * 136 * For those DLT_* codes that have, as far as we know, the same values on 137 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as 138 * DLT_xxx; that way, captures of those types can still be read by 139 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and 140 * captures of those types written by versions of libpcap that map DLT_ 141 * values to LINKTYPE_ values can still be read by older versions 142 * of libpcap. 143 * 144 * The other LINKTYPE_* codes are given values starting at 100, in the 145 * hopes that no DLT_* code will be given one of those values. 146 * 147 * In order to ensure that a given LINKTYPE_* code's value will refer to 148 * the same encapsulation type on all platforms, you should not allocate 149 * a new LINKTYPE_* value without consulting "tcpdump-workers@tcpdump.org". 150 * The tcpdump developers will allocate a value for you, and will not 151 * subsequently allocate it to anybody else; that value will be added to 152 * the "pcap.h" in the tcpdump.org CVS repository, so that a future 153 * libpcap release will include it. 154 * 155 * You should, if possible, also contribute patches to libpcap and tcpdump 156 * to handle the new encapsulation type, so that they can also be checked 157 * into the tcpdump.org CVS repository and so that they will appear in 158 * future libpcap and tcpdump releases. 159 * 160 * Do *NOT* assume that any values after the largest value in this file 161 * are available; you might not have the most up-to-date version of this 162 * file, and new values after that one might have been assigned. Also, 163 * do *NOT* use any values below 100 - those might already have been 164 * taken by one (or more!) organizations. 165 */ 166#define LINKTYPE_NULL DLT_NULL 167#define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ 168#define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ 169#define LINKTYPE_AX25 DLT_AX25 170#define LINKTYPE_PRONET DLT_PRONET 171#define LINKTYPE_CHAOS DLT_CHAOS 172#define LINKTYPE_TOKEN_RING DLT_IEEE802 /* DLT_IEEE802 is used for Token Ring */ 173#define LINKTYPE_ARCNET DLT_ARCNET /* BSD-style headers */ 174#define LINKTYPE_SLIP DLT_SLIP 175#define LINKTYPE_PPP DLT_PPP 176#define LINKTYPE_FDDI DLT_FDDI 177 178/* 179 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 180 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol 181 * field) at the beginning of the packet. 182 * 183 * This is for use when there is always such a header; the address field 184 * might be 0xff, for regular PPP, or it might be an address field for Cisco 185 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco 186 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. 187 * 188 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that 189 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL 190 * captures will be written out with a link type that NetBSD's tcpdump 191 * can read. 192 */ 193#define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ 194 195#define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ 196 197#define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ 198 199#define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ 200#define LINKTYPE_RAW 101 /* raw IP */ 201#define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ 202#define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ 203#define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ 204#define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ 205#define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ 206#define LINKTYPE_FRELAY 107 /* Frame Relay */ 207#define LINKTYPE_LOOP 108 /* OpenBSD loopback */ 208#define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ 209 210/* 211 * These three types are reserved for future use. 212 */ 213#define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ 214#define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ 215#define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */ 216 217#define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ 218#define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ 219#define LINKTYPE_ECONET 115 /* Acorn Econet */ 220 221/* 222 * Reserved for use with OpenBSD ipfilter. 223 */ 224#define LINKTYPE_IPFILTER 116 225 226#define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ 227#define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ 228#define LINKTYPE_PRISM_HEADER 119 /* 802.11+Prism II monitor mode */ 229#define LINKTYPE_AIRONET_HEADER 120 /* FreeBSD Aironet driver stuff */ 230 231/* 232 * Reserved for Siemens HiPath HDLC. 233 */ 234#define LINKTYPE_HHDLC 121 235 236#define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ 237#define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ 238 239/* 240 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 241 * for private use. 242 */ 243#define LINKTYPE_RIO 124 /* RapidIO */ 244#define LINKTYPE_PCI_EXP 125 /* PCI Express */ 245#define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ 246 247#define LINKTYPE_IEEE802_11_RADIO 127 /* 802.11 plus BSD radio header */ 248 249/* 250 * Reserved for the TZSP encapsulation, as per request from 251 * Chris Waters <chris.waters@networkchemistry.com> 252 * TZSP is a generic encapsulation for any other link type, 253 * which includes a means to include meta-information 254 * with the packet, e.g. signal strength and channel 255 * for 802.11 packets. 256 */ 257#define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ 258 259#define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ 260 261/* 262 * Juniper-private data link types, as per request from 263 * Hannes Gredler <hannes@juniper.net>. The corresponding 264 * DLT_s are used for passing on chassis-internal 265 * metainformation such as QOS profiles, etc.. 266 */ 267#define LINKTYPE_JUNIPER_MLPPP 130 268#define LINKTYPE_JUNIPER_MLFR 131 269#define LINKTYPE_JUNIPER_ES 132 270#define LINKTYPE_JUNIPER_GGSN 133 271#define LINKTYPE_JUNIPER_MFR 134 272#define LINKTYPE_JUNIPER_ATM2 135 273#define LINKTYPE_JUNIPER_SERVICES 136 274#define LINKTYPE_JUNIPER_ATM1 137 275 276#define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ 277 278#define LINKTYPE_MTP2_WITH_PHDR 139 279#define LINKTYPE_MTP2 140 280#define LINKTYPE_MTP3 141 281#define LINKTYPE_SCCP 142 282 283#define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ 284 285#define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ 286 287/* 288 * Reserved for IBM SP switch and IBM Next Federation switch. 289 */ 290#define LINKTYPE_IBM_SP 145 291#define LINKTYPE_IBM_SN 146 292 293/* 294 * Reserved for private use. If you have some link-layer header type 295 * that you want to use within your organization, with the capture files 296 * using that link-layer header type not ever be sent outside your 297 * organization, you can use these values. 298 * 299 * No libpcap release will use these for any purpose, nor will any 300 * tcpdump release use them, either. 301 * 302 * Do *NOT* use these in capture files that you expect anybody not using 303 * your private versions of capture-file-reading tools to read; in 304 * particular, do *NOT* use them in products, otherwise you may find that 305 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 306 * read capture files from your firewall/intrusion detection/traffic 307 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, 308 * and you may also find that the developers of those applications will 309 * not accept patches to let them read those files. 310 * 311 * Also, do not use them if somebody might send you a capture using them 312 * for *their* private type and tools using them for *your* private type 313 * would have to read them. 314 * 315 * Instead, in those cases, ask "tcpdump-workers@tcpdump.org" for a new DLT_ 316 * and LINKTYPE_ value, as per the comment in pcap-bpf.h, and use the type 317 * you're given. 318 */ 319#define LINKTYPE_USER0 147 320#define LINKTYPE_USER1 148 321#define LINKTYPE_USER2 149 322#define LINKTYPE_USER3 150 323#define LINKTYPE_USER4 151 324#define LINKTYPE_USER5 152 325#define LINKTYPE_USER6 153 326#define LINKTYPE_USER7 154 327#define LINKTYPE_USER8 155 328#define LINKTYPE_USER9 156 329#define LINKTYPE_USER10 157 330#define LINKTYPE_USER11 158 331#define LINKTYPE_USER12 159 332#define LINKTYPE_USER13 160 333#define LINKTYPE_USER14 161 334#define LINKTYPE_USER15 162 335 336/* 337 * For future use with 802.11 captures - defined by AbsoluteValue 338 * Systems to store a number of bits of link-layer information 339 * including radio information: 340 * 341 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 342 * 343 * but could and arguably should also be used by non-AVS Linux 344 * 802.11 drivers; that may happen in the future. 345 */ 346#define LINKTYPE_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */ 347 348/* 349 * Juniper-private data link type, as per request from 350 * Hannes Gredler <hannes@juniper.net>. The corresponding 351 * DLT_s are used for passing on chassis-internal 352 * metainformation such as QOS profiles, etc.. 353 */ 354#define LINKTYPE_JUNIPER_MONITOR 164 355 356/* 357 * Reserved for BACnet MS/TP. 358 */ 359#define LINKTYPE_BACNET_MS_TP 165 360 361/* 362 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 363 * 364 * This is used in some OSes to allow a kernel socket filter to distinguish 365 * between incoming and outgoing packets, on a socket intended to 366 * supply pppd with outgoing packets so it can do dial-on-demand and 367 * hangup-on-lack-of-demand; incoming packets are filtered out so they 368 * don't cause pppd to hold the connection up (you don't want random 369 * input packets such as port scans, packets from old lost connections, 370 * etc. to force the connection to stay up). 371 * 372 * The first byte of the PPP header (0xff03) is modified to accomodate 373 * the direction - 0x00 = IN, 0x01 = OUT. 374 */ 375#define LINKTYPE_PPP_PPPD 166 376 377/* 378 * Juniper-private data link type, as per request from 379 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 380 * for passing on chassis-internal metainformation such as 381 * QOS profiles, cookies, etc.. 382 */ 383#define LINKTYPE_JUNIPER_PPPOE 167 384#define LINKTYPE_JUNIPER_PPPOE_ATM 168 385 386#define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ 387#define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 388#define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */ 389 390/* 391 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 392 * monitoring equipment. 393 */ 394#define LINKTYPE_GCOM_T1E1 172 395#define LINKTYPE_GCOM_SERIAL 173 396 397/* 398 * Juniper-private data link type, as per request from 399 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 400 * for internal communication to Physical Interface Cards (PIC) 401 */ 402#define LINKTYPE_JUNIPER_PIC_PEER 174 403 404/* 405 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 406 * Measurement Systems. They add an ERF header (see 407 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 408 * the link-layer header. 409 */ 410#define LINKTYPE_ERF_ETH 175 /* Ethernet */ 411#define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ 412 413/* 414 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 415 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 416 * includes additional information before the LAPD header, so it's 417 * not necessarily a generic LAPD header. 418 */ 419#define LINKTYPE_LINUX_LAPD 177 420 421/* 422 * Juniper-private data link type, as per request from 423 * Hannes Gredler <hannes@juniper.net>. 424 * The Link Types are used for prepending meta-information 425 * like interface index, interface name 426 * before standard Ethernet, PPP, Frelay & C-HDLC Frames 427 */ 428#define LINKTYPE_JUNIPER_ETHER 178 429#define LINKTYPE_JUNIPER_PPP 179 430#define LINKTYPE_JUNIPER_FRELAY 180 431#define LINKTYPE_JUNIPER_CHDLC 181 432 433/* 434 * Multi Link Frame Relay (FRF.16) 435 */ 436#define LINKTYPE_MFR 182 437 438/* 439 * Juniper-private data link type, as per request from 440 * Hannes Gredler <hannes@juniper.net>. 441 * The DLT_ is used for internal communication with a 442 * voice Adapter Card (PIC) 443 */ 444#define LINKTYPE_JUNIPER_VP 183 445 446/* 447 * Arinc 429 frames. 448 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 449 * Every frame contains a 32bit A429 label. 450 * More documentation on Arinc 429 can be found at 451 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf 452 */ 453#define LINKTYPE_A429 184 454 455/* 456 * Arinc 653 Interpartition Communication messages. 457 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 458 * Please refer to the A653-1 standard for more information. 459 */ 460#define LINKTYPE_A653_ICM 185 461 462/* 463 * Controller Area Network (CAN) v. 2.0B packets. 464 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 465 * Used to dump CAN packets coming from a CAN Vector board. 466 * More documentation on the CAN v2.0B frames can be found at 467 * http://www.can-cia.org/downloads/?269 468 */ 469#define LINKTYPE_CAN20B 190 470 471static struct linktype_map { 472 int dlt; 473 int linktype; 474} map[] = { 475 /* 476 * These DLT_* codes have LINKTYPE_* codes with values identical 477 * to the values of the corresponding DLT_* code. 478 */ 479 { DLT_NULL, LINKTYPE_NULL }, 480 { DLT_EN10MB, LINKTYPE_ETHERNET }, 481 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 482 { DLT_AX25, LINKTYPE_AX25 }, 483 { DLT_PRONET, LINKTYPE_PRONET }, 484 { DLT_CHAOS, LINKTYPE_CHAOS }, 485 { DLT_IEEE802, LINKTYPE_TOKEN_RING }, 486 { DLT_ARCNET, LINKTYPE_ARCNET }, 487 { DLT_SLIP, LINKTYPE_SLIP }, 488 { DLT_PPP, LINKTYPE_PPP }, 489 { DLT_FDDI, LINKTYPE_FDDI }, 490 491 /* 492 * These DLT_* codes have different values on different 493 * platforms; we map them to LINKTYPE_* codes that 494 * have values that should never be equal to any DLT_* 495 * code. 496 */ 497#ifdef DLT_FR 498 /* BSD/OS Frame Relay */ 499 { DLT_FR, LINKTYPE_FRELAY }, 500#endif 501 502 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 503 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 504 { DLT_RAW, LINKTYPE_RAW }, 505 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 506 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 507 508 /* BSD/OS Cisco HDLC */ 509 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 510 511 /* 512 * These DLT_* codes are not on all platforms, but, so far, 513 * there don't appear to be any platforms that define 514 * other codes with those values; we map them to 515 * different LINKTYPE_* values anyway, just in case. 516 */ 517 518 /* Linux ATM Classical IP */ 519 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 520 521 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 522 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 523 524 /* NetBSD PPP over Ethernet */ 525 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 526 527 /* IEEE 802.11 wireless */ 528 { DLT_IEEE802_11, LINKTYPE_IEEE802_11 }, 529 530 /* Frame Relay */ 531 { DLT_FRELAY, LINKTYPE_FRELAY }, 532 533 /* OpenBSD loopback */ 534 { DLT_LOOP, LINKTYPE_LOOP }, 535 536 /* Linux cooked socket capture */ 537 { DLT_LINUX_SLL, LINKTYPE_LINUX_SLL }, 538 539 /* Apple LocalTalk hardware */ 540 { DLT_LTALK, LINKTYPE_LTALK }, 541 542 /* Acorn Econet */ 543 { DLT_ECONET, LINKTYPE_ECONET }, 544 545 /* OpenBSD DLT_PFLOG */ 546 { DLT_PFLOG, LINKTYPE_PFLOG }, 547 548 /* For Cisco-internal use */ 549 { DLT_CISCO_IOS, LINKTYPE_CISCO_IOS }, 550 551 /* Prism II monitor-mode header plus 802.11 header */ 552 { DLT_PRISM_HEADER, LINKTYPE_PRISM_HEADER }, 553 554 /* FreeBSD Aironet driver stuff */ 555 { DLT_AIRONET_HEADER, LINKTYPE_AIRONET_HEADER }, 556 557 /* Siemens HiPath HDLC */ 558 { DLT_HHDLC, LINKTYPE_HHDLC }, 559 560 /* RFC 2625 IP-over-Fibre Channel */ 561 { DLT_IP_OVER_FC, LINKTYPE_IP_OVER_FC }, 562 563 /* Solaris+SunATM */ 564 { DLT_SUNATM, LINKTYPE_SUNATM }, 565 566 /* RapidIO */ 567 { DLT_RIO, LINKTYPE_RIO }, 568 569 /* PCI Express */ 570 { DLT_PCI_EXP, LINKTYPE_PCI_EXP }, 571 572 /* Xilinx Aurora link layer */ 573 { DLT_AURORA, LINKTYPE_AURORA }, 574 575 /* 802.11 plus BSD radio header */ 576 { DLT_IEEE802_11_RADIO, LINKTYPE_IEEE802_11_RADIO }, 577 578 /* Tazmen Sniffer Protocol */ 579 { DLT_TZSP, LINKTYPE_TZSP }, 580 581 /* Arcnet with Linux-style link-layer headers */ 582 { DLT_ARCNET_LINUX, LINKTYPE_ARCNET_LINUX }, 583 584 /* Juniper-internal chassis encapsulation */ 585 { DLT_JUNIPER_MLPPP, LINKTYPE_JUNIPER_MLPPP }, 586 { DLT_JUNIPER_MLFR, LINKTYPE_JUNIPER_MLFR }, 587 { DLT_JUNIPER_ES, LINKTYPE_JUNIPER_ES }, 588 { DLT_JUNIPER_GGSN, LINKTYPE_JUNIPER_GGSN }, 589 { DLT_JUNIPER_MFR, LINKTYPE_JUNIPER_MFR }, 590 { DLT_JUNIPER_ATM2, LINKTYPE_JUNIPER_ATM2 }, 591 { DLT_JUNIPER_SERVICES, LINKTYPE_JUNIPER_SERVICES }, 592 { DLT_JUNIPER_ATM1, LINKTYPE_JUNIPER_ATM1 }, 593 594 /* Apple IP-over-IEEE 1394 cooked header */ 595 { DLT_APPLE_IP_OVER_IEEE1394, LINKTYPE_APPLE_IP_OVER_IEEE1394 }, 596 597 /* SS7 */ 598 { DLT_MTP2_WITH_PHDR, LINKTYPE_MTP2_WITH_PHDR }, 599 { DLT_MTP2, LINKTYPE_MTP2 }, 600 { DLT_MTP3, LINKTYPE_MTP3 }, 601 { DLT_SCCP, LINKTYPE_SCCP }, 602 603 /* DOCSIS MAC frames */ 604 { DLT_DOCSIS, LINKTYPE_DOCSIS }, 605 606 /* IrDA IrLAP packets + Linux-cooked header */ 607 { DLT_LINUX_IRDA, LINKTYPE_LINUX_IRDA }, 608 609 /* IBM SP and Next Federation switches */ 610 { DLT_IBM_SP, LINKTYPE_IBM_SP }, 611 { DLT_IBM_SN, LINKTYPE_IBM_SN }, 612 613 /* 802.11 plus AVS radio header */ 614 { DLT_IEEE802_11_RADIO_AVS, LINKTYPE_IEEE802_11_RADIO_AVS }, 615 616 /* 617 * Any platform that defines additional DLT_* codes should: 618 * 619 * request a LINKTYPE_* code and value from tcpdump.org, 620 * as per the above; 621 * 622 * add, in their version of libpcap, an entry to map 623 * those DLT_* codes to the corresponding LINKTYPE_* 624 * code; 625 * 626 * redefine, in their "net/bpf.h", any DLT_* values 627 * that collide with the values used by their additional 628 * DLT_* codes, to remove those collisions (but without 629 * making them collide with any of the LINKTYPE_* 630 * values equal to 50 or above; they should also avoid 631 * defining DLT_* values that collide with those 632 * LINKTYPE_* values, either). 633 */ 634 635 /* Juniper-internal chassis encapsulation */ 636 { DLT_JUNIPER_MONITOR, LINKTYPE_JUNIPER_MONITOR }, 637 638 /* BACnet MS/TP */ 639 { DLT_BACNET_MS_TP, LINKTYPE_BACNET_MS_TP }, 640 641 /* PPP for pppd, with direction flag in the PPP header */ 642 { DLT_PPP_PPPD, LINKTYPE_PPP_PPPD}, 643 644 /* Juniper-internal chassis encapsulation */ 645 { DLT_JUNIPER_PPPOE, LINKTYPE_JUNIPER_PPPOE }, 646 { DLT_JUNIPER_PPPOE_ATM,LINKTYPE_JUNIPER_PPPOE_ATM }, 647 648 /* GPRS LLC */ 649 { DLT_GPRS_LLC, LINKTYPE_GPRS_LLC }, 650 651 /* Transparent Generic Framing Procedure (ITU-T G.7041/Y.1303) */ 652 { DLT_GPF_T, LINKTYPE_GPF_T }, 653 654 /* Framed Generic Framing Procedure (ITU-T G.7041/Y.1303) */ 655 { DLT_GPF_F, LINKTYPE_GPF_F }, 656 657 { DLT_GCOM_T1E1, LINKTYPE_GCOM_T1E1 }, 658 { DLT_GCOM_SERIAL, LINKTYPE_GCOM_SERIAL }, 659 660 /* Juniper-internal chassis encapsulation */ 661 { DLT_JUNIPER_PIC_PEER, LINKTYPE_JUNIPER_PIC_PEER }, 662 663 /* Endace types */ 664 { DLT_ERF_ETH, LINKTYPE_ERF_ETH }, 665 { DLT_ERF_POS, LINKTYPE_ERF_POS }, 666 667 /* viSDN LAPD */ 668 { DLT_LINUX_LAPD, LINKTYPE_LINUX_LAPD }, 669 670 /* Juniper meta-information before Ether, PPP, Frame Relay, C-HDLC Frames */ 671 { DLT_JUNIPER_ETHER, LINKTYPE_JUNIPER_ETHER }, 672 { DLT_JUNIPER_PPP, LINKTYPE_JUNIPER_PPP }, 673 { DLT_JUNIPER_FRELAY, LINKTYPE_JUNIPER_FRELAY }, 674 { DLT_JUNIPER_CHDLC, LINKTYPE_JUNIPER_CHDLC }, 675 676 /* Multi Link Frame Relay (FRF.16) */ 677 { DLT_MFR, LINKTYPE_MFR }, 678 679 /* Juniper Voice PIC */ 680 { DLT_JUNIPER_VP, LINKTYPE_JUNIPER_VP }, 681 682 /* Controller Area Network (CAN) v2.0B */ 683 { DLT_A429, LINKTYPE_A429 }, 684 685 /* Controller Area Network (CAN) v2.0B */ 686 { DLT_CAN20B, LINKTYPE_CAN20B }, 687 688 /* Arinc 653 Interpartition Communication messages */ 689 { DLT_A653_ICM, LINKTYPE_A653_ICM }, 690 691 { -1, -1 } 692}; 693 694static int 695dlt_to_linktype(int dlt) 696{ 697 int i; 698 699 for (i = 0; map[i].dlt != -1; i++) { 700 if (map[i].dlt == dlt) 701 return (map[i].linktype); 702 } 703 704 /* 705 * If we don't have a mapping for this DLT_ code, return an 706 * error; that means that the table above needs to have an 707 * entry added. 708 */ 709 return (-1); 710} 711 712static int 713linktype_to_dlt(int linktype) 714{ 715 int i; 716 717 for (i = 0; map[i].linktype != -1; i++) { 718 if (map[i].linktype == linktype) 719 return (map[i].dlt); 720 } 721 722 /* 723 * If we don't have an entry for this link type, return 724 * the link type value; it may be a DLT_ value from an 725 * older version of libpcap. 726 */ 727 return linktype; 728} 729 730static int 731sf_write_header(FILE *fp, int linktype, int thiszone, int snaplen) 732{ 733 struct pcap_file_header hdr; 734 735 hdr.magic = TCPDUMP_MAGIC; 736 hdr.version_major = PCAP_VERSION_MAJOR; 737 hdr.version_minor = PCAP_VERSION_MINOR; 738 739 hdr.thiszone = thiszone; 740 hdr.snaplen = snaplen; 741 hdr.sigfigs = 0; 742 hdr.linktype = linktype; 743 744 if (fwrite((char *)&hdr, sizeof(hdr), 1, fp) != 1) 745 return (-1); 746 747 return (0); 748} 749 750static void 751swap_hdr(struct pcap_file_header *hp) 752{ 753 hp->version_major = SWAPSHORT(hp->version_major); 754 hp->version_minor = SWAPSHORT(hp->version_minor); 755 hp->thiszone = SWAPLONG(hp->thiszone); 756 hp->sigfigs = SWAPLONG(hp->sigfigs); 757 hp->snaplen = SWAPLONG(hp->snaplen); 758 hp->linktype = SWAPLONG(hp->linktype); 759} 760 761static int 762sf_getnonblock(pcap_t *p, char *errbuf) 763{ 764 /* 765 * This is a savefile, not a live capture file, so never say 766 * it's in non-blocking mode. 767 */ 768 return (0); 769} 770 771static int 772sf_setnonblock(pcap_t *p, int nonblock, char *errbuf) 773{ 774 /* 775 * This is a savefile, not a live capture file, so ignore 776 * requests to put it in non-blocking mode. 777 */ 778 return (0); 779} 780 781static int 782sf_stats(pcap_t *p, struct pcap_stat *ps) 783{ 784 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 785 "Statistics aren't available from savefiles"); 786 return (-1); 787} 788 789static int 790sf_inject(pcap_t *p, const void *buf _U_, size_t size _U_) 791{ 792 strlcpy(p->errbuf, "Sending packets isn't supported on savefiles", 793 PCAP_ERRBUF_SIZE); 794 return (-1); 795} 796 797/* 798 * Set direction flag: Which packets do we accept on a forwarding 799 * single device? IN, OUT or both? 800 */ 801static int 802sf_setdirection(pcap_t *p, pcap_direction_t d) 803{ 804 snprintf(p->errbuf, sizeof(p->errbuf), 805 "Setting direction is not supported on savefiles"); 806 return (-1); 807} 808 809static void 810sf_close(pcap_t *p) 811{ 812 if (p->sf.rfile != stdin) 813 (void)fclose(p->sf.rfile); 814 if (p->sf.base != NULL) 815 free(p->sf.base); 816} 817 818pcap_t * 819pcap_open_offline(const char *fname, char *errbuf) 820{ 821 FILE *fp; 822 pcap_t *p; 823 824 if (fname[0] == '-' && fname[1] == '\0') 825 { 826 fp = stdin; 827#if defined(WIN32) || defined(MSDOS) 828 /* 829 * We're reading from the standard input, so put it in binary 830 * mode, as savefiles are binary files. 831 */ 832 SET_BINMODE(fp); 833#endif 834 } 835 else { 836#if !defined(WIN32) && !defined(MSDOS) 837 fp = fopen(fname, "r"); 838#else 839 fp = fopen(fname, "rb"); 840#endif 841 if (fp == NULL) { 842 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", fname, 843 pcap_strerror(errno)); 844 return (NULL); 845 } 846 } 847 p = pcap_fopen_offline(fp, errbuf); 848 if (p == NULL) { 849 if (fp != stdin) 850 fclose(fp); 851 } 852 return (p); 853} 854 855pcap_t * 856pcap_fopen_offline(FILE *fp, char *errbuf) 857{ 858 register pcap_t *p; 859 struct pcap_file_header hdr; 860 size_t amt_read; 861 bpf_u_int32 magic; 862 int linklen; 863 864 p = (pcap_t *)malloc(sizeof(*p)); 865 if (p == NULL) { 866 strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE); 867 return (NULL); 868 } 869 870 memset((char *)p, 0, sizeof(*p)); 871 872 amt_read = fread((char *)&hdr, 1, sizeof(hdr), fp); 873 if (amt_read != sizeof(hdr)) { 874 if (ferror(fp)) { 875 snprintf(errbuf, PCAP_ERRBUF_SIZE, 876 "error reading dump file: %s", 877 pcap_strerror(errno)); 878 } else { 879 snprintf(errbuf, PCAP_ERRBUF_SIZE, 880 "truncated dump file; tried to read %lu file header bytes, only got %lu", 881 (unsigned long)sizeof(hdr), 882 (unsigned long)amt_read); 883 } 884 goto bad; 885 } 886 magic = hdr.magic; 887 if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) { 888 magic = SWAPLONG(magic); 889 if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) { 890 snprintf(errbuf, PCAP_ERRBUF_SIZE, 891 "bad dump file format"); 892 goto bad; 893 } 894 p->sf.swapped = 1; 895 swap_hdr(&hdr); 896 } 897 if (magic == KUZNETZOV_TCPDUMP_MAGIC) { 898 /* 899 * XXX - the patch that's in some versions of libpcap 900 * changes the packet header but not the magic number, 901 * and some other versions with this magic number have 902 * some extra debugging information in the packet header; 903 * we'd have to use some hacks^H^H^H^H^Hheuristics to 904 * detect those variants. 905 * 906 * Ethereal does that, but it does so by trying to read 907 * the first two packets of the file with each of the 908 * record header formats. That currently means it seeks 909 * backwards and retries the reads, which doesn't work 910 * on pipes. We want to be able to read from a pipe, so 911 * that strategy won't work; we'd have to buffer some 912 * data ourselves and read from that buffer in order to 913 * make that work. 914 */ 915 p->sf.hdrsize = sizeof(struct pcap_sf_patched_pkthdr); 916 } else 917 p->sf.hdrsize = sizeof(struct pcap_sf_pkthdr); 918 if (hdr.version_major < PCAP_VERSION_MAJOR) { 919 snprintf(errbuf, PCAP_ERRBUF_SIZE, "archaic file format"); 920 goto bad; 921 } 922 p->tzoff = hdr.thiszone; 923 p->snapshot = hdr.snaplen; 924 p->linktype = linktype_to_dlt(hdr.linktype); 925 p->sf.rfile = fp; 926#ifndef WIN32 927 p->bufsize = hdr.snaplen; 928#else 929 /* Allocate the space for pcap_pkthdr as well. It will be used by pcap_read_ex */ 930 p->bufsize = hdr.snaplen+sizeof(struct pcap_pkthdr); 931#endif 932 933 /* Align link header as required for proper data alignment */ 934 /* XXX should handle all types */ 935 switch (p->linktype) { 936 937 case DLT_EN10MB: 938 linklen = 14; 939 break; 940 941 case DLT_FDDI: 942 linklen = 13 + 8; /* fddi_header + llc */ 943 break; 944 945 case DLT_NULL: 946 default: 947 linklen = 0; 948 break; 949 } 950 951 if (p->bufsize < 0) 952 p->bufsize = BPF_MAXBUFSIZE; 953 p->sf.base = (u_char *)malloc(p->bufsize + BPF_ALIGNMENT); 954 if (p->sf.base == NULL) { 955 strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE); 956 goto bad; 957 } 958 p->buffer = p->sf.base + BPF_ALIGNMENT - (linklen % BPF_ALIGNMENT); 959 p->sf.version_major = hdr.version_major; 960 p->sf.version_minor = hdr.version_minor; 961#ifdef PCAP_FDDIPAD 962 /* Padding only needed for live capture fcode */ 963 p->fddipad = 0; 964#endif 965 966 /* 967 * We interchanged the caplen and len fields at version 2.3, 968 * in order to match the bpf header layout. But unfortunately 969 * some files were written with version 2.3 in their headers 970 * but without the interchanged fields. 971 * 972 * In addition, DG/UX tcpdump writes out files with a version 973 * number of 543.0, and with the caplen and len fields in the 974 * pre-2.3 order. 975 */ 976 switch (hdr.version_major) { 977 978 case 2: 979 if (hdr.version_minor < 3) 980 p->sf.lengths_swapped = SWAPPED; 981 else if (hdr.version_minor == 3) 982 p->sf.lengths_swapped = MAYBE_SWAPPED; 983 else 984 p->sf.lengths_swapped = NOT_SWAPPED; 985 break; 986 987 case 543: 988 p->sf.lengths_swapped = SWAPPED; 989 break; 990 991 default: 992 p->sf.lengths_swapped = NOT_SWAPPED; 993 break; 994 } 995 996#if !defined(WIN32) && !defined(MSDOS) 997 /* 998 * You can do "select()" and "poll()" on plain files on most 999 * platforms, and should be able to do so on pipes. 1000 * 1001 * You can't do "select()" on anything other than sockets in 1002 * Windows, so, on Win32 systems, we don't have "selectable_fd". 1003 */ 1004 p->selectable_fd = fileno(fp); 1005#endif 1006 1007 p->read_op = pcap_offline_read; 1008 p->inject_op = sf_inject; 1009 p->setfilter_op = install_bpf_program; 1010 p->setdirection_op = sf_setdirection; 1011 p->set_datalink_op = NULL; /* we don't support munging link-layer headers */ 1012 p->getnonblock_op = sf_getnonblock; 1013 p->setnonblock_op = sf_setnonblock; 1014 p->stats_op = sf_stats; 1015 p->close_op = sf_close; 1016 1017 return (p); 1018 bad: 1019 free(p); 1020 return (NULL); 1021} 1022 1023/* 1024 * Read sf_readfile and return the next packet. Return the header in hdr 1025 * and the contents in buf. Return 0 on success, SFERR_EOF if there were 1026 * no more packets, and SFERR_TRUNC if a partial packet was encountered. 1027 */ 1028static int 1029sf_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char *buf, u_int buflen) 1030{ 1031 struct pcap_sf_patched_pkthdr sf_hdr; 1032 FILE *fp = p->sf.rfile; 1033 size_t amt_read; 1034 bpf_u_int32 t; 1035 1036 /* 1037 * Read the packet header; the structure we use as a buffer 1038 * is the longer structure for files generated by the patched 1039 * libpcap, but if the file has the magic number for an 1040 * unpatched libpcap we only read as many bytes as the regular 1041 * header has. 1042 */ 1043 amt_read = fread(&sf_hdr, 1, p->sf.hdrsize, fp); 1044 if (amt_read != p->sf.hdrsize) { 1045 if (ferror(fp)) { 1046 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1047 "error reading dump file: %s", 1048 pcap_strerror(errno)); 1049 return (-1); 1050 } else { 1051 if (amt_read != 0) { 1052 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1053 "truncated dump file; tried to read %d header bytes, only got %lu", 1054 p->sf.hdrsize, (unsigned long)amt_read); 1055 return (-1); 1056 } 1057 /* EOF */ 1058 return (1); 1059 } 1060 } 1061 1062 if (p->sf.swapped) { 1063 /* these were written in opposite byte order */ 1064 hdr->caplen = SWAPLONG(sf_hdr.caplen); 1065 hdr->len = SWAPLONG(sf_hdr.len); 1066 hdr->ts.tv_sec = SWAPLONG(sf_hdr.ts.tv_sec); 1067 hdr->ts.tv_usec = SWAPLONG(sf_hdr.ts.tv_usec); 1068 } else { 1069 hdr->caplen = sf_hdr.caplen; 1070 hdr->len = sf_hdr.len; 1071 hdr->ts.tv_sec = sf_hdr.ts.tv_sec; 1072 hdr->ts.tv_usec = sf_hdr.ts.tv_usec; 1073 } 1074 /* Swap the caplen and len fields, if necessary. */ 1075 switch (p->sf.lengths_swapped) { 1076 1077 case NOT_SWAPPED: 1078 break; 1079 1080 case MAYBE_SWAPPED: 1081 if (hdr->caplen <= hdr->len) { 1082 /* 1083 * The captured length is <= the actual length, 1084 * so presumably they weren't swapped. 1085 */ 1086 break; 1087 } 1088 /* FALLTHROUGH */ 1089 1090 case SWAPPED: 1091 t = hdr->caplen; 1092 hdr->caplen = hdr->len; 1093 hdr->len = t; 1094 break; 1095 } 1096 1097 if (hdr->caplen > buflen) { 1098 /* 1099 * This can happen due to Solaris 2.3 systems tripping 1100 * over the BUFMOD problem and not setting the snapshot 1101 * correctly in the savefile header. If the caplen isn't 1102 * grossly wrong, try to salvage. 1103 */ 1104 static u_char *tp = NULL; 1105 static size_t tsize = 0; 1106 1107 if (hdr->caplen > 65535) { 1108 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1109 "bogus savefile header"); 1110 return (-1); 1111 } 1112 1113 if (tsize < hdr->caplen) { 1114 tsize = ((hdr->caplen + 1023) / 1024) * 1024; 1115 if (tp != NULL) 1116 free((u_char *)tp); 1117 tp = (u_char *)malloc(tsize); 1118 if (tp == NULL) { 1119 tsize = 0; 1120 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1121 "BUFMOD hack malloc"); 1122 return (-1); 1123 } 1124 } 1125 amt_read = fread((char *)tp, 1, hdr->caplen, fp); 1126 if (amt_read != hdr->caplen) { 1127 if (ferror(fp)) { 1128 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1129 "error reading dump file: %s", 1130 pcap_strerror(errno)); 1131 } else { 1132 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1133 "truncated dump file; tried to read %u captured bytes, only got %lu", 1134 hdr->caplen, (unsigned long)amt_read); 1135 } 1136 return (-1); 1137 } 1138 /* 1139 * We can only keep up to buflen bytes. Since caplen > buflen 1140 * is exactly how we got here, we know we can only keep the 1141 * first buflen bytes and must drop the remainder. Adjust 1142 * caplen accordingly, so we don't get confused later as 1143 * to how many bytes we have to play with. 1144 */ 1145 hdr->caplen = buflen; 1146 memcpy((char *)buf, (char *)tp, buflen); 1147 1148 } else { 1149 /* read the packet itself */ 1150 amt_read = fread((char *)buf, 1, hdr->caplen, fp); 1151 if (amt_read != hdr->caplen) { 1152 if (ferror(fp)) { 1153 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1154 "error reading dump file: %s", 1155 pcap_strerror(errno)); 1156 } else { 1157 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1158 "truncated dump file; tried to read %u captured bytes, only got %lu", 1159 hdr->caplen, (unsigned long)amt_read); 1160 } 1161 return (-1); 1162 } 1163 } 1164 return (0); 1165} 1166 1167/* 1168 * Print out packets stored in the file initialized by sf_read_init(). 1169 * If cnt > 0, return after 'cnt' packets, otherwise continue until eof. 1170 */ 1171int 1172pcap_offline_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 1173{ 1174 struct bpf_insn *fcode; 1175 int status = 0; 1176 int n = 0; 1177 1178 while (status == 0) { 1179 struct pcap_pkthdr h; 1180 1181 /* 1182 * Has "pcap_breakloop()" been called? 1183 * If so, return immediately - if we haven't read any 1184 * packets, clear the flag and return -2 to indicate 1185 * that we were told to break out of the loop, otherwise 1186 * leave the flag set, so that the *next* call will break 1187 * out of the loop without having read any packets, and 1188 * return the number of packets we've processed so far. 1189 */ 1190 if (p->break_loop) { 1191 if (n == 0) { 1192 p->break_loop = 0; 1193 return (-2); 1194 } else 1195 return (n); 1196 } 1197 1198 status = sf_next_packet(p, &h, p->buffer, p->bufsize); 1199 if (status) { 1200 if (status == 1) 1201 return (0); 1202 return (status); 1203 } 1204 1205 if ((fcode = p->fcode.bf_insns) == NULL || 1206 bpf_filter(fcode, p->buffer, h.len, h.caplen)) { 1207 (*callback)(user, &h, p->buffer); 1208 if (++n >= cnt && cnt > 0) 1209 break; 1210 } 1211 } 1212 /*XXX this breaks semantics tcpslice expects */ 1213 return (n); 1214} 1215 1216/* 1217 * Output a packet to the initialized dump file. 1218 */ 1219void 1220pcap_dump(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) 1221{ 1222 register FILE *f; 1223 struct pcap_sf_pkthdr sf_hdr; 1224 1225 f = (FILE *)user; 1226 sf_hdr.ts.tv_sec = h->ts.tv_sec; 1227 sf_hdr.ts.tv_usec = h->ts.tv_usec; 1228 sf_hdr.caplen = h->caplen; 1229 sf_hdr.len = h->len; 1230 /* XXX we should check the return status */ 1231 (void)fwrite(&sf_hdr, sizeof(sf_hdr), 1, f); 1232 (void)fwrite((char *)sp, h->caplen, 1, f); 1233} 1234 1235static pcap_dumper_t * 1236pcap_setup_dump(pcap_t *p, int linktype, FILE *f, const char *fname) 1237{ 1238 1239#if defined(WIN32) || defined(MSDOS) 1240 /* 1241 * If we're writing to the standard output, put it in binary 1242 * mode, as savefiles are binary files. 1243 * 1244 * Otherwise, we turn off buffering. 1245 * XXX - why? And why not on the standard output? 1246 */ 1247 if (f == stdout) 1248 SET_BINMODE(f); 1249 else 1250 setbuf(f, NULL); 1251#endif 1252 if (sf_write_header(f, linktype, p->tzoff, p->snapshot) == -1) { 1253 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't write to %s: %s", 1254 fname, pcap_strerror(errno)); 1255 if (f != stdout) 1256 (void)fclose(f); 1257 return (NULL); 1258 } 1259 return ((pcap_dumper_t *)f); 1260} 1261 1262/* 1263 * Initialize so that sf_write() will output to the file named 'fname'. 1264 */ 1265pcap_dumper_t * 1266pcap_dump_open(pcap_t *p, const char *fname) 1267{ 1268 FILE *f; 1269 int linktype; 1270 1271 linktype = dlt_to_linktype(p->linktype); 1272 if (linktype == -1) { 1273 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1274 "%s: link-layer type %d isn't supported in savefiles", 1275 fname, linktype); 1276 return (NULL); 1277 } 1278 1279 if (fname[0] == '-' && fname[1] == '\0') { 1280 f = stdout; 1281 fname = "standard output"; 1282 } else { 1283#if !defined(WIN32) && !defined(MSDOS) 1284 f = fopen(fname, "w"); 1285#else 1286 f = fopen(fname, "wb"); 1287#endif 1288 if (f == NULL) { 1289 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s", 1290 fname, pcap_strerror(errno)); 1291 return (NULL); 1292 } 1293 } 1294 return (pcap_setup_dump(p, linktype, f, fname)); 1295} 1296 1297/* 1298 * Initialize so that sf_write() will output to the given stream. 1299 */ 1300pcap_dumper_t * 1301pcap_dump_fopen(pcap_t *p, FILE *f) 1302{ 1303 int linktype; 1304 1305 linktype = dlt_to_linktype(p->linktype); 1306 if (linktype == -1) { 1307 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1308 "stream: link-layer type %d isn't supported in savefiles", 1309 linktype); 1310 return (NULL); 1311 } 1312 1313 return (pcap_setup_dump(p, linktype, f, "stream")); 1314} 1315 1316FILE * 1317pcap_dump_file(pcap_dumper_t *p) 1318{ 1319 return ((FILE *)p); 1320} 1321 1322long 1323pcap_dump_ftell(pcap_dumper_t *p) 1324{ 1325 return (ftell((FILE *)p)); 1326} 1327 1328int 1329pcap_dump_flush(pcap_dumper_t *p) 1330{ 1331 1332 if (fflush((FILE *)p) == EOF) 1333 return (-1); 1334 else 1335 return (0); 1336} 1337 1338void 1339pcap_dump_close(pcap_dumper_t *p) 1340{ 1341 1342#ifdef notyet 1343 if (ferror((FILE *)p)) 1344 return-an-error; 1345 /* XXX should check return from fclose() too */ 1346#endif 1347 (void)fclose((FILE *)p); 1348} 1349