savefile.c revision 147894
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 1.126.2.8 2005/06/03 20:36:57 guy 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 * We use the "receiver-makes-right" approach to byte order, 76 * because time is at a premium when we are writing the file. 77 * In other words, the pcap_file_header and pcap_pkthdr, 78 * records are written in host byte order. 79 * Note that the bytes of packet data are written out in the order in 80 * which they were received, so multi-byte fields in packets are not 81 * written in host byte order, they're written in whatever order the 82 * sending machine put them in. 83 * 84 * ntoh[ls] aren't sufficient because we might need to swap on a big-endian 85 * machine (if the file was written in little-end order). 86 */ 87#define SWAPLONG(y) \ 88((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff)) 89#define SWAPSHORT(y) \ 90 ( (((y)&0xff)<<8) | ((u_short)((y)&0xff00)>>8) ) 91 92#define SFERR_TRUNC 1 93#define SFERR_BADVERSION 2 94#define SFERR_BADF 3 95#define SFERR_EOF 4 /* not really an error, just a status */ 96 97/* 98 * Setting O_BINARY on DOS/Windows is a bit tricky 99 */ 100#if defined(WIN32) 101 #define SET_BINMODE(f) _setmode(_fileno(f), _O_BINARY) 102#elif defined(MSDOS) 103 #if defined(__HIGHC__) 104 #define SET_BINMODE(f) setmode(f, O_BINARY) 105 #else 106 #define SET_BINMODE(f) setmode(fileno(f), O_BINARY) 107 #endif 108#endif 109 110/* 111 * We don't write DLT_* values to the capture file header, because 112 * they're not the same on all platforms. 113 * 114 * Unfortunately, the various flavors of BSD have not always used the same 115 * numerical values for the same data types, and various patches to 116 * libpcap for non-BSD OSes have added their own DLT_* codes for link 117 * layer encapsulation types seen on those OSes, and those codes have had, 118 * in some cases, values that were also used, on other platforms, for other 119 * link layer encapsulation types. 120 * 121 * This means that capture files of a type whose numerical DLT_* code 122 * means different things on different BSDs, or with different versions 123 * of libpcap, can't always be read on systems other than those like 124 * the one running on the machine on which the capture was made. 125 * 126 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes 127 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* 128 * codes to DLT_* codes when reading a savefile header. 129 * 130 * For those DLT_* codes that have, as far as we know, the same values on 131 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as 132 * DLT_xxx; that way, captures of those types can still be read by 133 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and 134 * captures of those types written by versions of libpcap that map DLT_ 135 * values to LINKTYPE_ values can still be read by older versions 136 * of libpcap. 137 * 138 * The other LINKTYPE_* codes are given values starting at 100, in the 139 * hopes that no DLT_* code will be given one of those values. 140 * 141 * In order to ensure that a given LINKTYPE_* code's value will refer to 142 * the same encapsulation type on all platforms, you should not allocate 143 * a new LINKTYPE_* value without consulting "tcpdump-workers@tcpdump.org". 144 * The tcpdump developers will allocate a value for you, and will not 145 * subsequently allocate it to anybody else; that value will be added to 146 * the "pcap.h" in the tcpdump.org CVS repository, so that a future 147 * libpcap release will include it. 148 * 149 * You should, if possible, also contribute patches to libpcap and tcpdump 150 * to handle the new encapsulation type, so that they can also be checked 151 * into the tcpdump.org CVS repository and so that they will appear in 152 * future libpcap and tcpdump releases. 153 * 154 * Do *NOT* assume that any values after the largest value in this file 155 * are available; you might not have the most up-to-date version of this 156 * file, and new values after that one might have been assigned. Also, 157 * do *NOT* use any values below 100 - those might already have been 158 * taken by one (or more!) organizations. 159 */ 160#define LINKTYPE_NULL DLT_NULL 161#define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ 162#define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ 163#define LINKTYPE_AX25 DLT_AX25 164#define LINKTYPE_PRONET DLT_PRONET 165#define LINKTYPE_CHAOS DLT_CHAOS 166#define LINKTYPE_TOKEN_RING DLT_IEEE802 /* DLT_IEEE802 is used for Token Ring */ 167#define LINKTYPE_ARCNET DLT_ARCNET /* BSD-style headers */ 168#define LINKTYPE_SLIP DLT_SLIP 169#define LINKTYPE_PPP DLT_PPP 170#define LINKTYPE_FDDI DLT_FDDI 171 172/* 173 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 174 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol 175 * field) at the beginning of the packet. 176 * 177 * This is for use when there is always such a header; the address field 178 * might be 0xff, for regular PPP, or it might be an address field for Cisco 179 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco 180 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. 181 * 182 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that 183 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL 184 * captures will be written out with a link type that NetBSD's tcpdump 185 * can read. 186 */ 187#define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ 188 189#define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ 190 191#define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ 192 193#define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ 194#define LINKTYPE_RAW 101 /* raw IP */ 195#define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ 196#define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ 197#define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ 198#define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ 199#define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ 200#define LINKTYPE_FRELAY 107 /* Frame Relay */ 201#define LINKTYPE_LOOP 108 /* OpenBSD loopback */ 202#define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ 203 204/* 205 * These three types are reserved for future use. 206 */ 207#define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ 208#define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ 209#define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */ 210 211#define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ 212#define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ 213#define LINKTYPE_ECONET 115 /* Acorn Econet */ 214 215/* 216 * Reserved for use with OpenBSD ipfilter. 217 */ 218#define LINKTYPE_IPFILTER 116 219 220#define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ 221#define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ 222#define LINKTYPE_PRISM_HEADER 119 /* 802.11+Prism II monitor mode */ 223#define LINKTYPE_AIRONET_HEADER 120 /* FreeBSD Aironet driver stuff */ 224 225/* 226 * Reserved for Siemens HiPath HDLC. 227 */ 228#define LINKTYPE_HHDLC 121 229 230#define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ 231#define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ 232 233/* 234 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 235 * for private use. 236 */ 237#define LINKTYPE_RIO 124 /* RapidIO */ 238#define LINKTYPE_PCI_EXP 125 /* PCI Express */ 239#define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ 240 241#define LINKTYPE_IEEE802_11_RADIO 127 /* 802.11 plus BSD radio header */ 242 243/* 244 * Reserved for the TZSP encapsulation, as per request from 245 * Chris Waters <chris.waters@networkchemistry.com> 246 * TZSP is a generic encapsulation for any other link type, 247 * which includes a means to include meta-information 248 * with the packet, e.g. signal strength and channel 249 * for 802.11 packets. 250 */ 251#define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ 252 253#define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ 254 255/* 256 * Juniper-private data link types, as per request from 257 * Hannes Gredler <hannes@juniper.net>. The corresponding 258 * DLT_s are used for passing on chassis-internal 259 * metainformation such as QOS profiles, etc.. 260 */ 261#define LINKTYPE_JUNIPER_MLPPP 130 262#define LINKTYPE_JUNIPER_MLFR 131 263#define LINKTYPE_JUNIPER_ES 132 264#define LINKTYPE_JUNIPER_GGSN 133 265#define LINKTYPE_JUNIPER_MFR 134 266#define LINKTYPE_JUNIPER_ATM2 135 267#define LINKTYPE_JUNIPER_SERVICES 136 268#define LINKTYPE_JUNIPER_ATM1 137 269 270#define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ 271 272#define LINKTYPE_MTP2_WITH_PHDR 139 273#define LINKTYPE_MTP2 140 274#define LINKTYPE_MTP3 141 275#define LINKTYPE_SCCP 142 276 277#define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ 278 279#define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ 280 281/* 282 * Reserved for IBM SP switch and IBM Next Federation switch. 283 */ 284#define LINKTYPE_IBM_SP 145 285#define LINKTYPE_IBM_SN 146 286 287/* 288 * Reserved for private use. If you have some link-layer header type 289 * that you want to use within your organization, with the capture files 290 * using that link-layer header type not ever be sent outside your 291 * organization, you can use these values. 292 * 293 * No libpcap release will use these for any purpose, nor will any 294 * tcpdump release use them, either. 295 * 296 * Do *NOT* use these in capture files that you expect anybody not using 297 * your private versions of capture-file-reading tools to read; in 298 * particular, do *NOT* use them in products, otherwise you may find that 299 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 300 * read capture files from your firewall/intrusion detection/traffic 301 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, 302 * and you may also find that the developers of those applications will 303 * not accept patches to let them read those files. 304 * 305 * Also, do not use them if somebody might send you a capture using them 306 * for *their* private type and tools using them for *your* private type 307 * would have to read them. 308 * 309 * Instead, in those cases, ask "tcpdump-workers@tcpdump.org" for a new DLT_ 310 * and LINKTYPE_ value, as per the comment in pcap-bpf.h, and use the type 311 * you're given. 312 */ 313#define LINKTYPE_USER0 147 314#define LINKTYPE_USER1 148 315#define LINKTYPE_USER2 149 316#define LINKTYPE_USER3 150 317#define LINKTYPE_USER4 151 318#define LINKTYPE_USER5 152 319#define LINKTYPE_USER6 153 320#define LINKTYPE_USER7 154 321#define LINKTYPE_USER8 155 322#define LINKTYPE_USER9 156 323#define LINKTYPE_USER10 157 324#define LINKTYPE_USER11 158 325#define LINKTYPE_USER12 159 326#define LINKTYPE_USER13 160 327#define LINKTYPE_USER14 161 328#define LINKTYPE_USER15 162 329 330/* 331 * For future use with 802.11 captures - defined by AbsoluteValue 332 * Systems to store a number of bits of link-layer information 333 * including radio information: 334 * 335 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 336 * 337 * but could and arguably should also be used by non-AVS Linux 338 * 802.11 drivers; that may happen in the future. 339 */ 340#define LINKTYPE_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */ 341 342/* 343 * Juniper-private data link type, as per request from 344 * Hannes Gredler <hannes@juniper.net>. The corresponding 345 * DLT_s are used for passing on chassis-internal 346 * metainformation such as QOS profiles, etc.. 347 */ 348#define LINKTYPE_JUNIPER_MONITOR 164 349 350/* 351 * Reserved for BACnet MS/TP. 352 */ 353#define LINKTYPE_BACNET_MS_TP 165 354 355/* 356 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 357 * 358 * This is used in some OSes to allow a kernel socket filter to distinguish 359 * between incoming and outgoing packets, on a socket intended to 360 * supply pppd with outgoing packets so it can do dial-on-demand and 361 * hangup-on-lack-of-demand; incoming packets are filtered out so they 362 * don't cause pppd to hold the connection up (you don't want random 363 * input packets such as port scans, packets from old lost connections, 364 * etc. to force the connection to stay up). 365 * 366 * The first byte of the PPP header (0xff03) is modified to accomodate 367 * the direction - 0x00 = IN, 0x01 = OUT. 368 */ 369#define LINKTYPE_PPP_PPPD 166 370 371/* 372 * Juniper-private data link type, as per request from 373 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 374 * for passing on chassis-internal metainformation such as 375 * QOS profiles, cookies, etc.. 376 */ 377#define LINKTYPE_JUNIPER_PPPOE 167 378#define LINKTYPE_JUNIPER_PPPOE_ATM 168 379 380#define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ 381#define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 382#define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */ 383 384/* 385 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 386 * monitoring equipment. 387 */ 388#define LINKTYPE_GCOM_T1E1 172 389#define LINKTYPE_GCOM_SERIAL 173 390 391/* 392 * Juniper-private data link type, as per request from 393 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 394 * for internal communication to Physical Interface Cards (PIC) 395 */ 396#define LINKTYPE_JUNIPER_PIC_PEER 174 397 398/* 399 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 400 * Measurement Systems. They add an ERF header (see 401 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 402 * the link-layer header. 403 */ 404#define LINKTYPE_ERF_ETH 175 /* Ethernet */ 405#define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ 406 407/* 408 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 409 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 410 * includes additional information before the LAPD header, so it's 411 * not necessarily a generic LAPD header. 412 */ 413#define LINKTYPE_LINUX_LAPD 177 414 415static struct linktype_map { 416 int dlt; 417 int linktype; 418} map[] = { 419 /* 420 * These DLT_* codes have LINKTYPE_* codes with values identical 421 * to the values of the corresponding DLT_* code. 422 */ 423 { DLT_NULL, LINKTYPE_NULL }, 424 { DLT_EN10MB, LINKTYPE_ETHERNET }, 425 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 426 { DLT_AX25, LINKTYPE_AX25 }, 427 { DLT_PRONET, LINKTYPE_PRONET }, 428 { DLT_CHAOS, LINKTYPE_CHAOS }, 429 { DLT_IEEE802, LINKTYPE_TOKEN_RING }, 430 { DLT_ARCNET, LINKTYPE_ARCNET }, 431 { DLT_SLIP, LINKTYPE_SLIP }, 432 { DLT_PPP, LINKTYPE_PPP }, 433 { DLT_FDDI, LINKTYPE_FDDI }, 434 435 /* 436 * These DLT_* codes have different values on different 437 * platforms; we map them to LINKTYPE_* codes that 438 * have values that should never be equal to any DLT_* 439 * code. 440 */ 441#ifdef DLT_FR 442 /* BSD/OS Frame Relay */ 443 { DLT_FR, LINKTYPE_FRELAY }, 444#endif 445 446 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 447 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 448 { DLT_RAW, LINKTYPE_RAW }, 449 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 450 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 451 452 /* BSD/OS Cisco HDLC */ 453 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 454 455 /* 456 * These DLT_* codes are not on all platforms, but, so far, 457 * there don't appear to be any platforms that define 458 * other codes with those values; we map them to 459 * different LINKTYPE_* values anyway, just in case. 460 */ 461 462 /* Linux ATM Classical IP */ 463 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 464 465 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 466 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 467 468 /* NetBSD PPP over Ethernet */ 469 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 470 471 /* IEEE 802.11 wireless */ 472 { DLT_IEEE802_11, LINKTYPE_IEEE802_11 }, 473 474 /* Frame Relay */ 475 { DLT_FRELAY, LINKTYPE_FRELAY }, 476 477 /* OpenBSD loopback */ 478 { DLT_LOOP, LINKTYPE_LOOP }, 479 480 /* Linux cooked socket capture */ 481 { DLT_LINUX_SLL, LINKTYPE_LINUX_SLL }, 482 483 /* Apple LocalTalk hardware */ 484 { DLT_LTALK, LINKTYPE_LTALK }, 485 486 /* Acorn Econet */ 487 { DLT_ECONET, LINKTYPE_ECONET }, 488 489 /* OpenBSD DLT_PFLOG */ 490 { DLT_PFLOG, LINKTYPE_PFLOG }, 491 492 /* For Cisco-internal use */ 493 { DLT_CISCO_IOS, LINKTYPE_CISCO_IOS }, 494 495 /* Prism II monitor-mode header plus 802.11 header */ 496 { DLT_PRISM_HEADER, LINKTYPE_PRISM_HEADER }, 497 498 /* FreeBSD Aironet driver stuff */ 499 { DLT_AIRONET_HEADER, LINKTYPE_AIRONET_HEADER }, 500 501 /* Siemens HiPath HDLC */ 502 { DLT_HHDLC, LINKTYPE_HHDLC }, 503 504 /* RFC 2625 IP-over-Fibre Channel */ 505 { DLT_IP_OVER_FC, LINKTYPE_IP_OVER_FC }, 506 507 /* Solaris+SunATM */ 508 { DLT_SUNATM, LINKTYPE_SUNATM }, 509 510 /* RapidIO */ 511 { DLT_RIO, LINKTYPE_RIO }, 512 513 /* PCI Express */ 514 { DLT_PCI_EXP, LINKTYPE_PCI_EXP }, 515 516 /* Xilinx Aurora link layer */ 517 { DLT_AURORA, LINKTYPE_AURORA }, 518 519 /* 802.11 plus BSD radio header */ 520 { DLT_IEEE802_11_RADIO, LINKTYPE_IEEE802_11_RADIO }, 521 522 /* Tazmen Sniffer Protocol */ 523 { DLT_TZSP, LINKTYPE_TZSP }, 524 525 /* Arcnet with Linux-style link-layer headers */ 526 { DLT_ARCNET_LINUX, LINKTYPE_ARCNET_LINUX }, 527 528 /* Juniper-internal chassis encapsulation */ 529 { DLT_JUNIPER_MLPPP, LINKTYPE_JUNIPER_MLPPP }, 530 { DLT_JUNIPER_MLFR, LINKTYPE_JUNIPER_MLFR }, 531 { DLT_JUNIPER_ES, LINKTYPE_JUNIPER_ES }, 532 { DLT_JUNIPER_GGSN, LINKTYPE_JUNIPER_GGSN }, 533 { DLT_JUNIPER_MFR, LINKTYPE_JUNIPER_MFR }, 534 { DLT_JUNIPER_ATM2, LINKTYPE_JUNIPER_ATM2 }, 535 { DLT_JUNIPER_SERVICES, LINKTYPE_JUNIPER_SERVICES }, 536 { DLT_JUNIPER_ATM1, LINKTYPE_JUNIPER_ATM1 }, 537 538 /* Apple IP-over-IEEE 1394 cooked header */ 539 { DLT_APPLE_IP_OVER_IEEE1394, LINKTYPE_APPLE_IP_OVER_IEEE1394 }, 540 541 /* SS7 */ 542 { DLT_MTP2_WITH_PHDR, LINKTYPE_MTP2_WITH_PHDR }, 543 { DLT_MTP2, LINKTYPE_MTP2 }, 544 { DLT_MTP3, LINKTYPE_MTP3 }, 545 { DLT_SCCP, LINKTYPE_SCCP }, 546 547 /* DOCSIS MAC frames */ 548 { DLT_DOCSIS, LINKTYPE_DOCSIS }, 549 550 /* IrDA IrLAP packets + Linux-cooked header */ 551 { DLT_LINUX_IRDA, LINKTYPE_LINUX_IRDA }, 552 553 /* IBM SP and Next Federation switches */ 554 { DLT_IBM_SP, LINKTYPE_IBM_SP }, 555 { DLT_IBM_SN, LINKTYPE_IBM_SN }, 556 557 /* 802.11 plus AVS radio header */ 558 { DLT_IEEE802_11_RADIO_AVS, LINKTYPE_IEEE802_11_RADIO_AVS }, 559 560 /* 561 * Any platform that defines additional DLT_* codes should: 562 * 563 * request a LINKTYPE_* code and value from tcpdump.org, 564 * as per the above; 565 * 566 * add, in their version of libpcap, an entry to map 567 * those DLT_* codes to the corresponding LINKTYPE_* 568 * code; 569 * 570 * redefine, in their "net/bpf.h", any DLT_* values 571 * that collide with the values used by their additional 572 * DLT_* codes, to remove those collisions (but without 573 * making them collide with any of the LINKTYPE_* 574 * values equal to 50 or above; they should also avoid 575 * defining DLT_* values that collide with those 576 * LINKTYPE_* values, either). 577 */ 578 579 /* Juniper-internal chassis encapsulation */ 580 { DLT_JUNIPER_MONITOR, LINKTYPE_JUNIPER_MONITOR }, 581 582 /* BACnet MS/TP */ 583 { DLT_BACNET_MS_TP, LINKTYPE_BACNET_MS_TP }, 584 585 /* PPP for pppd, with direction flag in the PPP header */ 586 { DLT_PPP_PPPD, LINKTYPE_PPP_PPPD}, 587 588 /* Juniper-internal chassis encapsulation */ 589 { DLT_JUNIPER_PPPOE, LINKTYPE_JUNIPER_PPPOE }, 590 { DLT_JUNIPER_PPPOE_ATM,LINKTYPE_JUNIPER_PPPOE_ATM }, 591 592 /* GPRS LLC */ 593 { DLT_GPRS_LLC, LINKTYPE_GPRS_LLC }, 594 595 /* Transparent Generic Framing Procedure (ITU-T G.7041/Y.1303) */ 596 { DLT_GPF_T, LINKTYPE_GPF_T }, 597 598 /* Framed Generic Framing Procedure (ITU-T G.7041/Y.1303) */ 599 { DLT_GPF_F, LINKTYPE_GPF_F }, 600 601 { DLT_GCOM_T1E1, LINKTYPE_GCOM_T1E1 }, 602 { DLT_GCOM_SERIAL, LINKTYPE_GCOM_SERIAL }, 603 604 /* Juniper-internal chassis encapsulation */ 605 { DLT_JUNIPER_PIC_PEER, LINKTYPE_JUNIPER_PIC_PEER }, 606 607 /* Endace types */ 608 { DLT_ERF_ETH, LINKTYPE_ERF_ETH }, 609 { DLT_ERF_POS, LINKTYPE_ERF_POS }, 610 611 /* viSDN LAPD */ 612 { DLT_LINUX_LAPD, LINKTYPE_LINUX_LAPD }, 613 614 { -1, -1 } 615}; 616 617static int 618dlt_to_linktype(int dlt) 619{ 620 int i; 621 622 for (i = 0; map[i].dlt != -1; i++) { 623 if (map[i].dlt == dlt) 624 return (map[i].linktype); 625 } 626 627 /* 628 * If we don't have a mapping for this DLT_ code, return an 629 * error; that means that the table above needs to have an 630 * entry added. 631 */ 632 return (-1); 633} 634 635static int 636linktype_to_dlt(int linktype) 637{ 638 int i; 639 640 for (i = 0; map[i].linktype != -1; i++) { 641 if (map[i].linktype == linktype) 642 return (map[i].dlt); 643 } 644 645 /* 646 * If we don't have an entry for this link type, return 647 * the link type value; it may be a DLT_ value from an 648 * older version of libpcap. 649 */ 650 return linktype; 651} 652 653static int 654sf_write_header(FILE *fp, int linktype, int thiszone, int snaplen) 655{ 656 struct pcap_file_header hdr; 657 658 hdr.magic = TCPDUMP_MAGIC; 659 hdr.version_major = PCAP_VERSION_MAJOR; 660 hdr.version_minor = PCAP_VERSION_MINOR; 661 662 hdr.thiszone = thiszone; 663 hdr.snaplen = snaplen; 664 hdr.sigfigs = 0; 665 hdr.linktype = linktype; 666 667 if (fwrite((char *)&hdr, sizeof(hdr), 1, fp) != 1) 668 return (-1); 669 670 return (0); 671} 672 673static void 674swap_hdr(struct pcap_file_header *hp) 675{ 676 hp->version_major = SWAPSHORT(hp->version_major); 677 hp->version_minor = SWAPSHORT(hp->version_minor); 678 hp->thiszone = SWAPLONG(hp->thiszone); 679 hp->sigfigs = SWAPLONG(hp->sigfigs); 680 hp->snaplen = SWAPLONG(hp->snaplen); 681 hp->linktype = SWAPLONG(hp->linktype); 682} 683 684static int 685sf_getnonblock(pcap_t *p, char *errbuf) 686{ 687 /* 688 * This is a savefile, not a live capture file, so never say 689 * it's in non-blocking mode. 690 */ 691 return (0); 692} 693 694static int 695sf_setnonblock(pcap_t *p, int nonblock, char *errbuf) 696{ 697 /* 698 * This is a savefile, not a live capture file, so ignore 699 * requests to put it in non-blocking mode. 700 */ 701 return (0); 702} 703 704static int 705sf_stats(pcap_t *p, struct pcap_stat *ps) 706{ 707 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 708 "Statistics aren't available from savefiles"); 709 return (-1); 710} 711 712static int 713sf_inject(pcap_t *p, const void *buf _U_, size_t size _U_) 714{ 715 strlcpy(p->errbuf, "Sending packets isn't supported on savefiles", 716 PCAP_ERRBUF_SIZE); 717 return (-1); 718} 719 720/* 721 * Set direction flag: Which packets do we accept on a forwarding 722 * single device? IN, OUT or both? 723 */ 724static int 725sf_setdirection(pcap_t *p, direction_t d) 726{ 727 snprintf(p->errbuf, sizeof(p->errbuf), 728 "Setting direction is not supported on savefiles"); 729 return (-1); 730} 731 732static void 733sf_close(pcap_t *p) 734{ 735 if (p->sf.rfile != stdin) 736 (void)fclose(p->sf.rfile); 737 if (p->sf.base != NULL) 738 free(p->sf.base); 739} 740 741pcap_t * 742pcap_open_offline(const char *fname, char *errbuf) 743{ 744 FILE *fp; 745 pcap_t *p; 746 747 if (fname[0] == '-' && fname[1] == '\0') 748 { 749 fp = stdin; 750#if defined(WIN32) || defined(MSDOS) 751 /* 752 * We're reading from the standard input, so put it in binary 753 * mode, as savefiles are binary files. 754 */ 755 SET_BINMODE(fp); 756#endif 757 } 758 else { 759#if !defined(WIN32) && !defined(MSDOS) 760 fp = fopen(fname, "r"); 761#else 762 fp = fopen(fname, "rb"); 763#endif 764 if (fp == NULL) { 765 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", fname, 766 pcap_strerror(errno)); 767 return (NULL); 768 } 769 } 770 p = pcap_fopen_offline(fp, errbuf); 771 if (p == NULL) { 772 if (fp != stdin) 773 fclose(fp); 774 } 775 return (p); 776} 777 778pcap_t * 779pcap_fopen_offline(FILE *fp, char *errbuf) 780{ 781 register pcap_t *p; 782 struct pcap_file_header hdr; 783 size_t amt_read; 784 bpf_u_int32 magic; 785 int linklen; 786 787 p = (pcap_t *)malloc(sizeof(*p)); 788 if (p == NULL) { 789 strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE); 790 return (NULL); 791 } 792 793 memset((char *)p, 0, sizeof(*p)); 794 795 amt_read = fread((char *)&hdr, 1, sizeof(hdr), fp); 796 if (amt_read != sizeof(hdr)) { 797 if (ferror(fp)) { 798 snprintf(errbuf, PCAP_ERRBUF_SIZE, 799 "error reading dump file: %s", 800 pcap_strerror(errno)); 801 } else { 802 snprintf(errbuf, PCAP_ERRBUF_SIZE, 803 "truncated dump file; tried to read %lu file header bytes, only got %lu", 804 (unsigned long)sizeof(hdr), 805 (unsigned long)amt_read); 806 } 807 goto bad; 808 } 809 magic = hdr.magic; 810 if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) { 811 magic = SWAPLONG(magic); 812 if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) { 813 snprintf(errbuf, PCAP_ERRBUF_SIZE, 814 "bad dump file format"); 815 goto bad; 816 } 817 p->sf.swapped = 1; 818 swap_hdr(&hdr); 819 } 820 if (magic == KUZNETZOV_TCPDUMP_MAGIC) { 821 /* 822 * XXX - the patch that's in some versions of libpcap 823 * changes the packet header but not the magic number, 824 * and some other versions with this magic number have 825 * some extra debugging information in the packet header; 826 * we'd have to use some hacks^H^H^H^H^Hheuristics to 827 * detect those variants. 828 * 829 * Ethereal does that, but it does so by trying to read 830 * the first two packets of the file with each of the 831 * record header formats. That currently means it seeks 832 * backwards and retries the reads, which doesn't work 833 * on pipes. We want to be able to read from a pipe, so 834 * that strategy won't work; we'd have to buffer some 835 * data ourselves and read from that buffer in order to 836 * make that work. 837 */ 838 p->sf.hdrsize = sizeof(struct pcap_sf_patched_pkthdr); 839 } else 840 p->sf.hdrsize = sizeof(struct pcap_sf_pkthdr); 841 if (hdr.version_major < PCAP_VERSION_MAJOR) { 842 snprintf(errbuf, PCAP_ERRBUF_SIZE, "archaic file format"); 843 goto bad; 844 } 845 p->tzoff = hdr.thiszone; 846 p->snapshot = hdr.snaplen; 847 p->linktype = linktype_to_dlt(hdr.linktype); 848 p->sf.rfile = fp; 849#ifndef WIN32 850 p->bufsize = hdr.snaplen; 851#else 852 /* Allocate the space for pcap_pkthdr as well. It will be used by pcap_read_ex */ 853 p->bufsize = hdr.snaplen+sizeof(struct pcap_pkthdr); 854#endif 855 856 /* Align link header as required for proper data alignment */ 857 /* XXX should handle all types */ 858 switch (p->linktype) { 859 860 case DLT_EN10MB: 861 linklen = 14; 862 break; 863 864 case DLT_FDDI: 865 linklen = 13 + 8; /* fddi_header + llc */ 866 break; 867 868 case DLT_NULL: 869 default: 870 linklen = 0; 871 break; 872 } 873 874 if (p->bufsize < 0) 875 p->bufsize = BPF_MAXBUFSIZE; 876 p->sf.base = (u_char *)malloc(p->bufsize + BPF_ALIGNMENT); 877 if (p->sf.base == NULL) { 878 strlcpy(errbuf, "out of swap", PCAP_ERRBUF_SIZE); 879 goto bad; 880 } 881 p->buffer = p->sf.base + BPF_ALIGNMENT - (linklen % BPF_ALIGNMENT); 882 p->sf.version_major = hdr.version_major; 883 p->sf.version_minor = hdr.version_minor; 884#ifdef PCAP_FDDIPAD 885 /* Padding only needed for live capture fcode */ 886 p->fddipad = 0; 887#endif 888 889 /* 890 * We interchanged the caplen and len fields at version 2.3, 891 * in order to match the bpf header layout. But unfortunately 892 * some files were written with version 2.3 in their headers 893 * but without the interchanged fields. 894 * 895 * In addition, DG/UX tcpdump writes out files with a version 896 * number of 543.0, and with the caplen and len fields in the 897 * pre-2.3 order. 898 */ 899 switch (hdr.version_major) { 900 901 case 2: 902 if (hdr.version_minor < 3) 903 p->sf.lengths_swapped = SWAPPED; 904 else if (hdr.version_minor == 3) 905 p->sf.lengths_swapped = MAYBE_SWAPPED; 906 else 907 p->sf.lengths_swapped = NOT_SWAPPED; 908 break; 909 910 case 543: 911 p->sf.lengths_swapped = SWAPPED; 912 break; 913 914 default: 915 p->sf.lengths_swapped = NOT_SWAPPED; 916 break; 917 } 918 919#if !defined(WIN32) && !defined(MSDOS) 920 /* 921 * You can do "select()" and "poll()" on plain files on most 922 * platforms, and should be able to do so on pipes. 923 * 924 * You can't do "select()" on anything other than sockets in 925 * Windows, so, on Win32 systems, we don't have "selectable_fd". 926 */ 927 p->selectable_fd = fileno(fp); 928#endif 929 930 p->read_op = pcap_offline_read; 931 p->inject_op = sf_inject; 932 p->setfilter_op = install_bpf_program; 933 p->setdirection_op = sf_setdirection; 934 p->set_datalink_op = NULL; /* we don't support munging link-layer headers */ 935 p->getnonblock_op = sf_getnonblock; 936 p->setnonblock_op = sf_setnonblock; 937 p->stats_op = sf_stats; 938 p->close_op = sf_close; 939 940 return (p); 941 bad: 942 free(p); 943 return (NULL); 944} 945 946/* 947 * Read sf_readfile and return the next packet. Return the header in hdr 948 * and the contents in buf. Return 0 on success, SFERR_EOF if there were 949 * no more packets, and SFERR_TRUNC if a partial packet was encountered. 950 */ 951static int 952sf_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char *buf, u_int buflen) 953{ 954 struct pcap_sf_patched_pkthdr sf_hdr; 955 FILE *fp = p->sf.rfile; 956 size_t amt_read; 957 bpf_u_int32 t; 958 959 /* 960 * Read the packet header; the structure we use as a buffer 961 * is the longer structure for files generated by the patched 962 * libpcap, but if the file has the magic number for an 963 * unpatched libpcap we only read as many bytes as the regular 964 * header has. 965 */ 966 amt_read = fread(&sf_hdr, 1, p->sf.hdrsize, fp); 967 if (amt_read != p->sf.hdrsize) { 968 if (ferror(fp)) { 969 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 970 "error reading dump file: %s", 971 pcap_strerror(errno)); 972 return (-1); 973 } else { 974 if (amt_read != 0) { 975 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 976 "truncated dump file; tried to read %d header bytes, only got %lu", 977 p->sf.hdrsize, (unsigned long)amt_read); 978 return (-1); 979 } 980 /* EOF */ 981 return (1); 982 } 983 } 984 985 if (p->sf.swapped) { 986 /* these were written in opposite byte order */ 987 hdr->caplen = SWAPLONG(sf_hdr.caplen); 988 hdr->len = SWAPLONG(sf_hdr.len); 989 hdr->ts.tv_sec = SWAPLONG(sf_hdr.ts.tv_sec); 990 hdr->ts.tv_usec = SWAPLONG(sf_hdr.ts.tv_usec); 991 } else { 992 hdr->caplen = sf_hdr.caplen; 993 hdr->len = sf_hdr.len; 994 hdr->ts.tv_sec = sf_hdr.ts.tv_sec; 995 hdr->ts.tv_usec = sf_hdr.ts.tv_usec; 996 } 997 /* Swap the caplen and len fields, if necessary. */ 998 switch (p->sf.lengths_swapped) { 999 1000 case NOT_SWAPPED: 1001 break; 1002 1003 case MAYBE_SWAPPED: 1004 if (hdr->caplen <= hdr->len) { 1005 /* 1006 * The captured length is <= the actual length, 1007 * so presumably they weren't swapped. 1008 */ 1009 break; 1010 } 1011 /* FALLTHROUGH */ 1012 1013 case SWAPPED: 1014 t = hdr->caplen; 1015 hdr->caplen = hdr->len; 1016 hdr->len = t; 1017 break; 1018 } 1019 1020 if (hdr->caplen > buflen) { 1021 /* 1022 * This can happen due to Solaris 2.3 systems tripping 1023 * over the BUFMOD problem and not setting the snapshot 1024 * correctly in the savefile header. If the caplen isn't 1025 * grossly wrong, try to salvage. 1026 */ 1027 static u_char *tp = NULL; 1028 static size_t tsize = 0; 1029 1030 if (hdr->caplen > 65535) { 1031 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1032 "bogus savefile header"); 1033 return (-1); 1034 } 1035 1036 if (tsize < hdr->caplen) { 1037 tsize = ((hdr->caplen + 1023) / 1024) * 1024; 1038 if (tp != NULL) 1039 free((u_char *)tp); 1040 tp = (u_char *)malloc(tsize); 1041 if (tp == NULL) { 1042 tsize = 0; 1043 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1044 "BUFMOD hack malloc"); 1045 return (-1); 1046 } 1047 } 1048 amt_read = fread((char *)tp, 1, hdr->caplen, fp); 1049 if (amt_read != hdr->caplen) { 1050 if (ferror(fp)) { 1051 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1052 "error reading dump file: %s", 1053 pcap_strerror(errno)); 1054 } else { 1055 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1056 "truncated dump file; tried to read %u captured bytes, only got %lu", 1057 hdr->caplen, (unsigned long)amt_read); 1058 } 1059 return (-1); 1060 } 1061 /* 1062 * We can only keep up to buflen bytes. Since caplen > buflen 1063 * is exactly how we got here, we know we can only keep the 1064 * first buflen bytes and must drop the remainder. Adjust 1065 * caplen accordingly, so we don't get confused later as 1066 * to how many bytes we have to play with. 1067 */ 1068 hdr->caplen = buflen; 1069 memcpy((char *)buf, (char *)tp, buflen); 1070 1071 } else { 1072 /* read the packet itself */ 1073 amt_read = fread((char *)buf, 1, hdr->caplen, fp); 1074 if (amt_read != hdr->caplen) { 1075 if (ferror(fp)) { 1076 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1077 "error reading dump file: %s", 1078 pcap_strerror(errno)); 1079 } else { 1080 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1081 "truncated dump file; tried to read %u captured bytes, only got %lu", 1082 hdr->caplen, (unsigned long)amt_read); 1083 } 1084 return (-1); 1085 } 1086 } 1087 return (0); 1088} 1089 1090/* 1091 * Print out packets stored in the file initialized by sf_read_init(). 1092 * If cnt > 0, return after 'cnt' packets, otherwise continue until eof. 1093 */ 1094int 1095pcap_offline_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 1096{ 1097 struct bpf_insn *fcode; 1098 int status = 0; 1099 int n = 0; 1100 1101 while (status == 0) { 1102 struct pcap_pkthdr h; 1103 1104 /* 1105 * Has "pcap_breakloop()" been called? 1106 * If so, return immediately - if we haven't read any 1107 * packets, clear the flag and return -2 to indicate 1108 * that we were told to break out of the loop, otherwise 1109 * leave the flag set, so that the *next* call will break 1110 * out of the loop without having read any packets, and 1111 * return the number of packets we've processed so far. 1112 */ 1113 if (p->break_loop) { 1114 if (n == 0) { 1115 p->break_loop = 0; 1116 return (-2); 1117 } else 1118 return (n); 1119 } 1120 1121 status = sf_next_packet(p, &h, p->buffer, p->bufsize); 1122 if (status) { 1123 if (status == 1) 1124 return (0); 1125 return (status); 1126 } 1127 1128 if ((fcode = p->fcode.bf_insns) == NULL || 1129 bpf_filter(fcode, p->buffer, h.len, h.caplen)) { 1130 (*callback)(user, &h, p->buffer); 1131 if (++n >= cnt && cnt > 0) 1132 break; 1133 } 1134 } 1135 /*XXX this breaks semantics tcpslice expects */ 1136 return (n); 1137} 1138 1139/* 1140 * Output a packet to the initialized dump file. 1141 */ 1142void 1143pcap_dump(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) 1144{ 1145 register FILE *f; 1146 struct pcap_sf_pkthdr sf_hdr; 1147 1148 f = (FILE *)user; 1149 sf_hdr.ts.tv_sec = h->ts.tv_sec; 1150 sf_hdr.ts.tv_usec = h->ts.tv_usec; 1151 sf_hdr.caplen = h->caplen; 1152 sf_hdr.len = h->len; 1153 /* XXX we should check the return status */ 1154 (void)fwrite(&sf_hdr, sizeof(sf_hdr), 1, f); 1155 (void)fwrite((char *)sp, h->caplen, 1, f); 1156} 1157 1158static pcap_dumper_t * 1159pcap_setup_dump(pcap_t *p, int linktype, FILE *f, const char *fname) 1160{ 1161 1162#if defined(WIN32) || defined(MSDOS) 1163 /* 1164 * If we're writing to the standard output, put it in binary 1165 * mode, as savefiles are binary files. 1166 * 1167 * Otherwise, we turn off buffering. 1168 * XXX - why? And why not on the standard output? 1169 */ 1170 if (f == stdout) 1171 SET_BINMODE(f); 1172 else 1173 setbuf(f, NULL); 1174#endif 1175 if (sf_write_header(f, linktype, p->tzoff, p->snapshot) == -1) { 1176 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't write to %s: %s", 1177 fname, pcap_strerror(errno)); 1178 if (f != stdout) 1179 (void)fclose(f); 1180 return (NULL); 1181 } 1182 return ((pcap_dumper_t *)f); 1183} 1184 1185/* 1186 * Initialize so that sf_write() will output to the file named 'fname'. 1187 */ 1188pcap_dumper_t * 1189pcap_dump_open(pcap_t *p, const char *fname) 1190{ 1191 FILE *f; 1192 int linktype; 1193 1194 linktype = dlt_to_linktype(p->linktype); 1195 if (linktype == -1) { 1196 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1197 "%s: link-layer type %d isn't supported in savefiles", 1198 fname, linktype); 1199 return (NULL); 1200 } 1201 1202 if (fname[0] == '-' && fname[1] == '\0') { 1203 f = stdout; 1204 fname = "standard output"; 1205 } else { 1206#if !defined(WIN32) && !defined(MSDOS) 1207 f = fopen(fname, "w"); 1208#else 1209 f = fopen(fname, "wb"); 1210#endif 1211 if (f == NULL) { 1212 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s", 1213 fname, pcap_strerror(errno)); 1214 return (NULL); 1215 } 1216 } 1217 return (pcap_setup_dump(p, linktype, f, fname)); 1218} 1219 1220/* 1221 * Initialize so that sf_write() will output to the given stream. 1222 */ 1223pcap_dumper_t * 1224pcap_dump_fopen(pcap_t *p, FILE *f) 1225{ 1226 int linktype; 1227 1228 linktype = dlt_to_linktype(p->linktype); 1229 if (linktype == -1) { 1230 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 1231 "stream: link-layer type %d isn't supported in savefiles", 1232 linktype); 1233 return (NULL); 1234 } 1235 1236 return (pcap_setup_dump(p, linktype, f, "stream")); 1237} 1238 1239FILE * 1240pcap_dump_file(pcap_dumper_t *p) 1241{ 1242 return ((FILE *)p); 1243} 1244 1245long 1246pcap_dump_ftell(pcap_dumper_t *p) 1247{ 1248 return (ftell((FILE *)p)); 1249} 1250 1251int 1252pcap_dump_flush(pcap_dumper_t *p) 1253{ 1254 1255 if (fflush((FILE *)p) == EOF) 1256 return (-1); 1257 else 1258 return (0); 1259} 1260 1261void 1262pcap_dump_close(pcap_dumper_t *p) 1263{ 1264 1265#ifdef notyet 1266 if (ferror((FILE *)p)) 1267 return-an-error; 1268 /* XXX should check return from fclose() too */ 1269#endif 1270 (void)fclose((FILE *)p); 1271} 1272