The Tcpdump Group git mirrors - tcpdump/blob - tcpdump.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   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  * Support for splitting captures into multiple files with a maximum
  22  * file size:
  23  *
  24  * Copyright (c) 2001
  25  *      Seth Webster <swebster@sst.ll.mit.edu>
  26  */
  27
  28 #ifndef lint
  29 static const char copyright[] =
  30     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
  31 The Regents of the University of California.  All rights reserved.\n";
  32 static const char rcsid[] =
  33     "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.186 2002-09-05 21:25:51 guy Exp $ (LBL)";
  34 #endif
  35
  36 /*
  37  * tcpdump - monitor tcp/ip traffic on an ethernet.
  38  *
  39  * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
  40  * Mercilessly hacked and occasionally improved since then via the
  41  * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
  42  */
  43
  44 #ifdef HAVE_CONFIG_H
  45 #include "config.h"
  46 #endif
  47
  48 #include <tcpdump-stdinc.h>
  49
  50 #ifdef WIN32
  51 #include "getopt.h"
  52 #include "w32_fzs.h"
  53 extern int strcasecmp (const char *__s1, const char *__s2);
  54 extern int SIZE_BUF;
  55 #define off_t long
  56 #define uint UINT
  57 #endif /* WIN32 */
  58
  59 #include <pcap.h>
  60 #include <signal.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64
  65
  66 #include "interface.h"
  67 #include "addrtoname.h"
  68 #include "machdep.h"
  69 #include "setsignal.h"
  70 #include "gmt2local.h"
  71
  72 int aflag;                      /* translate network and broadcast addresses */
  73 int dflag;                      /* print filter code */
  74 int eflag;                      /* print ethernet header */
  75 int fflag;                      /* don't translate "foreign" IP address */
  76 int nflag;                      /* leave addresses as numbers */
  77 int Nflag;                      /* remove domains from printed host names */
  78 int Oflag = 1;                  /* run filter code optimizer */
  79 int pflag;                      /* don't go promiscuous */
  80 int qflag;                      /* quick (shorter) output */
  81 int Rflag = 1;                  /* print sequence # field in AH/ESP*/
  82 int sflag = 0;                  /* use the libsmi to translate OIDs */
  83 int Sflag;                      /* print raw TCP sequence numbers */
  84 int tflag = 1;                  /* print packet arrival time */
  85 int uflag = 0;                  /* Print undecoded NFS handles */
  86 int vflag;                      /* verbose */
  87 int xflag;                      /* print packet in hex */
  88 int Xflag;                      /* print packet in ascii as well as hex */
  89 off_t Cflag = 0;                /* rotate dump files after this many bytes */
  90 int Aflag = 0;                  /* print packet only in ascii observing LF, CR, TAB, SPACE */
  91
  92 char *espsecret = NULL;         /* ESP secret key */
  93
  94 int packettype;
  95
  96 int infodelay;
  97 int infoprint;
  98
  99 char *program_name;
 100
 101 int32_t thiszone;               /* seconds offset from gmt to local time */
 102
 103 /* Forwards */
 104 static RETSIGTYPE cleanup(int);
 105 static void usage(void) __attribute__((noreturn));
 106
 107 static void dump_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 108
 109 #ifdef SIGINFO
 110 RETSIGTYPE requestinfo(int);
 111 #endif
 112
 113 /* Length of saved portion of packet. */
 114 int snaplen = DEFAULT_SNAPLEN;
 115
 116 struct printer {
 117         pcap_handler f;
 118         int type;
 119 };
 120
 121 static struct printer printers[] = {
 122         { arcnet_if_print,      DLT_ARCNET },
 123         { ether_if_print,       DLT_EN10MB },
 124         { token_if_print,       DLT_IEEE802 },
 125 #ifdef DLT_LANE8023
 126         { lane_if_print,        DLT_LANE8023 },
 127 #endif
 128 #ifdef DLT_CIP
 129         { cip_if_print,         DLT_CIP },
 130 #endif
 131 #ifdef DLT_ATM_CLIP
 132         { cip_if_print,         DLT_ATM_CLIP },
 133 #endif
 134         { sl_if_print,          DLT_SLIP },
 135         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 136         { ppp_if_print,         DLT_PPP },
 137         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 138         { fddi_if_print,        DLT_FDDI },
 139         { null_if_print,        DLT_NULL },
 140 #ifdef DLT_LOOP
 141         { null_if_print,        DLT_LOOP },
 142 #endif
 143         { raw_if_print,         DLT_RAW },
 144         { atm_if_print,         DLT_ATM_RFC1483 },
 145 #ifdef DLT_C_HDLC
 146         { chdlc_if_print,       DLT_C_HDLC },
 147 #endif
 148 #ifdef DLT_HDLC
 149         { chdlc_if_print,       DLT_HDLC },
 150 #endif
 151 #ifdef DLT_PPP_SERIAL
 152         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 153 #endif
 154 #ifdef DLT_PPP_ETHER
 155         { pppoe_if_print,       DLT_PPP_ETHER },
 156 #endif
 157 #ifdef DLT_LINUX_SLL
 158         { sll_if_print,         DLT_LINUX_SLL },
 159 #endif
 160 #ifdef DLT_IEEE802_11
 161         { ieee802_11_if_print,  DLT_IEEE802_11},
 162 #endif
 163 #ifdef DLT_LTALK
 164         { ltalk_if_print,       DLT_LTALK },
 165 #endif
 166 #ifdef DLT_PFLOG
 167         { pflog_if_print,       DLT_PFLOG },
 168 #endif
 169 #ifdef DLT_FR
 170         { fr_if_print,          DLT_FR },
 171 #endif
 172 #ifdef DLT_FRELAY
 173         { fr_if_print,          DLT_FRELAY },
 174 #endif
 175 #ifdef DLT_SUNATM
 176         { sunatm_if_print,      DLT_SUNATM },
 177 #endif
 178         { NULL,                 0 },
 179 };
 180
 181 static pcap_handler
 182 lookup_printer(int type)
 183 {
 184         struct printer *p;
 185
 186         for (p = printers; p->f; ++p)
 187                 if (type == p->type)
 188                         return p->f;
 189
 190         error("unknown data link type %d", type);
 191         /* NOTREACHED */
 192 }
 193
 194 static pcap_t *pd;
 195
 196 extern int optind;
 197 extern int opterr;
 198 extern char *optarg;
 199
 200 struct dump_info {
 201         char    *WFileName;
 202         pcap_t  *pd;
 203         pcap_dumper_t *p;
 204 };
 205
 206 int
 207 main(int argc, char **argv)
 208 {
 209         register int cnt, op, i;
 210         bpf_u_int32 localnet, netmask;
 211         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
 212         pcap_handler printer;
 213         struct bpf_program fcode;
 214 #ifndef WIN32
 215         RETSIGTYPE (*oldhandler)(int);
 216 #endif
 217         struct dump_info dumpinfo;
 218         u_char *pcap_userdata;
 219         char ebuf[PCAP_ERRBUF_SIZE];
 220 #ifdef HAVE_PCAP_FINDALLDEVS
 221         pcap_if_t *devpointer;
 222         int devnum;
 223 #endif
 224 #ifdef WIN32
 225         DWORD dwVersion;
 226         DWORD dwWindowsMajorVersion;
 227         u_int UserBufferSize=1000000;
 228 #endif
 229
 230 #ifdef WIN32
 231         dwVersion=GetVersion();         /* get the OS version */
 232         dwWindowsMajorVersion =  (DWORD)(LOBYTE(LOWORD(dwVersion)));
 233         if(wsockinit()!=0) return 1;
 234 #endif /* WIN32 */
 235
 236         cnt = -1;
 237         device = NULL;
 238         infile = NULL;
 239         RFileName = NULL;
 240         WFileName = NULL;
 241         if ((cp = strrchr(argv[0], '/')) != NULL)
 242                 program_name = cp + 1;
 243         else
 244                 program_name = argv[0];
 245
 246         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 247                 error("%s", ebuf);
 248
 249 #ifdef LIBSMI
 250         smiInit("tcpdump");
 251 #endif
 252
 253         opterr = 0;
 254         while (
 255 #ifdef WIN32
 256             (op = getopt(argc, argv, "aAB:c:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 257 #else /* WIN32 */
 258 #ifdef HAVE_PCAP_FINDALLDEVS
 259             (op = getopt(argc, argv, "aAc:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 260 #else /* HAVE_PCAP_FINDALLDEVS */
 261             (op = getopt(argc, argv, "aAc:C:deE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 262 #endif /* HAVE_PCAP_FINDALLDEVS */
 263 #endif /* WIN32 */
 264                 switch (op) {
 265
 266                 case 'a':
 267                         ++aflag;
 268                         break;
 269
 270                case 'A':
 271                        ++xflag;
 272                        ++Xflag;
 273                        ++Aflag;
 274                        break;
 275
 276 #ifdef WIN32
 277                 case 'B':
 278                         UserBufferSize = atoi(optarg)*1024;
 279                         if (UserBufferSize < 0)
 280                                 error("invalid packet buffer size %s", optarg);
 281                         break;
 282 #endif /* WIN32 */
 283
 284                 case 'c':
 285                         cnt = atoi(optarg);
 286                         if (cnt <= 0)
 287                                 error("invalid packet count %s", optarg);
 288                         break;
 289
 290                 case 'C':
 291                         Cflag = atoi(optarg) * 1000000;
 292                         if (Cflag < 0)
 293                                 error("invalid file size %s", optarg);
 294                         break;
 295
 296                 case 'd':
 297                         ++dflag;
 298                         break;
 299
 300 #ifdef HAVE_PCAP_FINDALLDEVS
 301                 case 'D':
 302                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 303                                 error("%s", ebuf);
 304                         else {
 305                                 for (i = 0; devpointer != 0; i++) {
 306                                         printf("%d.%s", i+1, devpointer->name);
 307                                         if (devpointer->description != NULL)
 308                                                 printf(" (%s)", devpointer->description);
 309                                         printf("\n");
 310                                         devpointer = devpointer->next;
 311                                 }
 312                         }
 313                         return 0;
 314 #endif /* HAVE_PCAP_FINDALLDEVS */
 315
 316                 case 'e':
 317                         ++eflag;
 318                         break;
 319
 320                 case 'E':
 321 #ifndef HAVE_LIBCRYPTO
 322                         warning("crypto code not compiled in");
 323 #endif
 324                         espsecret = optarg;
 325                         break;
 326
 327                 case 'f':
 328                         ++fflag;
 329                         break;
 330
 331                 case 'F':
 332                         infile = optarg;
 333                         break;
 334
 335                 case 'i':
 336                         if (optarg[0] == '0' && optarg[1] == 0)
 337                                 error("Invalid adapter index");
 338
 339 #ifdef HAVE_PCAP_FINDALLDEVS
 340                         /*
 341                          * If the argument is a number, treat it as
 342                          * an index into the list of adapters, as
 343                          * printed by "tcpdump -D".
 344                          *
 345                          * This should be OK on UNIX systems, as interfaces
 346                          * shouldn't have names that begin with digits.
 347                          * It can be useful on Windows, where more than
 348                          * one interface can have the same name.
 349                          */
 350                         if ((devnum = atoi(optarg)) != 0) {
 351                                 if (devnum < 0)
 352                                         error("Invalid adapter index");
 353
 354                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 355                                         error("%s", ebuf);
 356                                 else {
 357                                         for (i = 0; i < devnum-1; i++){
 358                                                 devpointer = devpointer->next;
 359                                                 if (devpointer == NULL)
 360                                                         error("Invalid adapter index");
 361                                         }
 362                                 }
 363                                 device = devpointer->name;
 364                                 break;
 365                         }
 366 #endif /* HAVE_PCAP_FINDALLDEVS */
 367                         device = optarg;
 368                         break;
 369
 370                 case 'l':
 371 #ifdef HAVE_SETLINEBUF
 372                         setlinebuf(stdout);
 373 #else
 374                         setvbuf(stdout, NULL, _IOLBF, 0);
 375 #endif
 376                         break;
 377
 378                 case 'n':
 379                         ++nflag;
 380                         break;
 381
 382                 case 'N':
 383                         ++Nflag;
 384                         break;
 385
 386                 case 'm':
 387 #ifdef LIBSMI
 388                         if (smiLoadModule(optarg) == 0) {
 389                                 error("could not load MIB module %s", optarg);
 390                         }
 391                         sflag = 1;
 392 #else
 393                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 394                                       program_name, optarg);
 395                         (void)fprintf(stderr, "(no libsmi support)\n");
 396 #endif
 397
 398                 case 'O':
 399                         Oflag = 0;
 400                         break;
 401
 402                 case 'p':
 403                         ++pflag;
 404                         break;
 405
 406                 case 'q':
 407                         ++qflag;
 408                         break;
 409
 410                 case 'r':
 411                         RFileName = optarg;
 412                         break;
 413
 414                 case 'R':
 415                         Rflag = 0;
 416                         break;
 417
 418                 case 's': {
 419                         char *end;
 420
 421                         snaplen = strtol(optarg, &end, 0);
 422                         if (optarg == end || *end != '\0'
 423                             || snaplen < 0 || snaplen > 65535)
 424                                 error("invalid snaplen %s", optarg);
 425                         else if (snaplen == 0)
 426                                 snaplen = 65535;
 427                         break;
 428                 }
 429
 430                 case 'S':
 431                         ++Sflag;
 432                         break;
 433
 434                 case 't':
 435                         --tflag;
 436                         break;
 437
 438                 case 'T':
 439                         if (strcasecmp(optarg, "vat") == 0)
 440                                 packettype = PT_VAT;
 441                         else if (strcasecmp(optarg, "wb") == 0)
 442                                 packettype = PT_WB;
 443                         else if (strcasecmp(optarg, "rpc") == 0)
 444                                 packettype = PT_RPC;
 445                         else if (strcasecmp(optarg, "rtp") == 0)
 446                                 packettype = PT_RTP;
 447                         else if (strcasecmp(optarg, "rtcp") == 0)
 448                                 packettype = PT_RTCP;
 449                         else if (strcasecmp(optarg, "snmp") == 0)
 450                                 packettype = PT_SNMP;
 451                         else if (strcasecmp(optarg, "cnfp") == 0)
 452                                 packettype = PT_CNFP;
 453                         else
 454                                 error("unknown packet type `%s'", optarg);
 455                         break;
 456
 457                 case 'u':
 458                         ++uflag;
 459                         break;
 460
 461                 case 'v':
 462                         ++vflag;
 463                         break;
 464
 465                 case 'w':
 466                         WFileName = optarg;
 467                         break;
 468
 469                 case 'x':
 470                         ++xflag;
 471                         break;
 472
 473                 case 'X':
 474                         ++xflag;
 475                         ++Xflag;
 476                         break;
 477
 478 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 479                 case 'Y':
 480                         {
 481                         /* Undocumented flag */
 482 #ifdef HAVE_PCAP_DEBUG
 483                         extern int pcap_debug;
 484                         pcap_debug = 1;
 485 #else
 486                         extern int yydebug;
 487                         yydebug = 1;
 488 #endif
 489                         }
 490                         break;
 491 #endif
 492                 default:
 493                         usage();
 494                         /* NOTREACHED */
 495                 }
 496
 497         if (aflag && nflag)
 498                 error("-a and -n options are incompatible");
 499
 500         if (tflag > 0)
 501                 thiszone = gmt2local(0);
 502
 503         if (RFileName != NULL) {
 504                 /*
 505                  * We don't need network access, so set it back to the user id.
 506                  * Also, this prevents the user from reading anyone's
 507                  * trace file.
 508                  */
 509 #ifndef WIN32
 510                 setuid(getuid());
 511 #endif /* WIN32 */
 512
 513                 pd = pcap_open_offline(RFileName, ebuf);
 514                 if (pd == NULL)
 515                         error("%s", ebuf);
 516                 localnet = 0;
 517                 netmask = 0;
 518                 if (fflag != 0)
 519                         error("-f and -r options are incompatible");
 520         } else {
 521                 if (device == NULL) {
 522                         device = pcap_lookupdev(ebuf);
 523                         if (device == NULL)
 524                                 error("%s", ebuf);
 525                 }
 526 #ifdef WIN32
 527                 PrintCapBegins(program_name,device);
 528 #endif /* WIN32 */
 529                 *ebuf = '\0';
 530                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
 531                 if (pd == NULL)
 532                         error("%s", ebuf);
 533                 else if (*ebuf)
 534                         warning("%s", ebuf);
 535 #ifdef WIN32
 536                 if(UserBufferSize != 1000000)
 537                         if(pcap_setbuff(pd, UserBufferSize)==-1){
 538                                 error("%s", pcap_geterr(pd));
 539                         }
 540 #endif /* WIN32 */
 541                 i = pcap_snapshot(pd);
 542                 if (snaplen < i) {
 543                         warning("snaplen raised from %d to %d", snaplen, i);
 544                         snaplen = i;
 545                 }
 546                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 547                         localnet = 0;
 548                         netmask = 0;
 549                         warning("%s", ebuf);
 550                 }
 551                 /*
 552                  * Let user own process after socket has been opened.
 553                  */
 554 #ifndef WIN32
 555                 setuid(getuid());
 556 #endif /* WIN32 */
 557         }
 558         if (infile)
 559                 cmdbuf = read_infile(infile);
 560         else
 561                 cmdbuf = copy_argv(&argv[optind]);
 562
 563         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 564                 error("%s", pcap_geterr(pd));
 565         if (dflag) {
 566                 bpf_dump(&fcode, dflag);
 567                 pcap_close(pd);
 568                 exit(0);
 569         }
 570         init_addrtoname(localnet, netmask);
 571
 572         (void)setsignal(SIGTERM, cleanup);
 573         (void)setsignal(SIGINT, cleanup);
 574         /* Cooperate with nohup(1) */
 575 #ifndef WIN32
 576         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
 577                 (void)setsignal(SIGHUP, oldhandler);
 578 #endif /* WIN32 */
 579
 580         if (pcap_setfilter(pd, &fcode) < 0)
 581                 error("%s", pcap_geterr(pd));
 582         if (WFileName) {
 583                 pcap_dumper_t *p = pcap_dump_open(pd, WFileName);
 584                 if (p == NULL)
 585                         error("%s", pcap_geterr(pd));
 586                 if (Cflag != 0) {
 587                         printer = dump_and_trunc;
 588                         dumpinfo.WFileName = WFileName;
 589                         dumpinfo.pd = pd;
 590                         dumpinfo.p = p;
 591                         pcap_userdata = (u_char *)&dumpinfo;
 592                 } else {
 593                         printer = pcap_dump;
 594                         pcap_userdata = (u_char *)p;
 595                 }
 596         } else {
 597                 printer = lookup_printer(pcap_datalink(pd));
 598                 pcap_userdata = 0;
 599 #ifdef SIGINFO
 600                 (void)setsignal(SIGINFO, requestinfo);
 601 #endif
 602         }
 603 #ifndef WIN32
 604         if (RFileName == NULL) {
 605                 (void)fprintf(stderr, "%s: listening on %s\n",
 606                     program_name, device);
 607                 (void)fflush(stderr);
 608         }
 609 #endif /* WIN32 */
 610         if (pcap_loop(pd, cnt, printer, pcap_userdata) < 0) {
 611                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
 612                     program_name, pcap_geterr(pd));
 613                 cleanup(0);
 614                 pcap_close(pd);
 615                 exit(1);
 616         }
 617         if (RFileName == NULL)
 618                 info(1);
 619         pcap_close(pd);
 620         exit(0);
 621 }
 622
 623 /* make a clean exit on interrupts */
 624 static RETSIGTYPE
 625 cleanup(int signo)
 626 {
 627
 628         /* Can't print the summary if reading from a savefile */
 629         if (pd != NULL && pcap_file(pd) == NULL) {
 630                 (void)fflush(stdout);
 631                 putc('\n', stderr);
 632                 info(1);
 633         }
 634         if (signo)
 635                 exit(0);
 636 }
 637
 638 void
 639 info(register int verbose)
 640 {
 641         struct pcap_stat stat;
 642
 643         if (pcap_stats(pd, &stat) < 0) {
 644                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
 645                 return;
 646         }
 647
 648         if (!verbose)
 649                 fprintf(stderr, "%s: ", program_name);
 650
 651         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
 652         if (!verbose)
 653                 fputs(", ", stderr);
 654         else
 655                 putc('\n', stderr);
 656         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
 657         infoprint = 0;
 658 }
 659
 660 static void
 661 reverse(char *s)
 662 {
 663         int i, j, c;
 664
 665         for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
 666                 c = s[i];
 667                 s[i] = s[j];
 668                 s[j] = c;
 669         }
 670 }
 671
 672
 673 static void
 674 swebitoa(unsigned int n, char *s)
 675 {
 676         unsigned int i;
 677
 678         i = 0;
 679         do {
 680                 s[i++] = n % 10 + '0';
 681         } while ((n /= 10) > 0);
 682
 683         s[i] = '\0';
 684         reverse(s);
 685 }
 686
 687 static void
 688 dump_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 689 {
 690         struct dump_info *info;
 691         static uint cnt = 2;
 692         char *name;
 693
 694         info = (struct dump_info *)user;
 695
 696         /*
 697          * XXX - this won't prevent capture files from getting
 698          * larger than Cflag - the last packet written to the
 699          * file could put it over Cflag.
 700          */
 701         if (ftell((FILE *)info->p) > Cflag) {
 702                 name = (char *) malloc(strlen(info->WFileName) + 4);
 703                 if (name == NULL)
 704                         error("dump_and_trunc: malloc");
 705                 strcpy(name, info->WFileName);
 706                 swebitoa(cnt, name + strlen(info->WFileName));
 707                 cnt++;
 708                 pcap_dump_close(info->p);
 709                 info->p = pcap_dump_open(info->pd, name);
 710                 free(name);
 711                 if (info->p == NULL)
 712                         error("%s", pcap_geterr(pd));
 713         }
 714
 715         pcap_dump((u_char *)info->p, h, sp);
 716 }
 717
 718 /* Like default_print() but data need not be aligned */
 719 void
 720 default_print_unaligned(register const u_char *cp, register u_int length)
 721 {
 722         register u_int i, s;
 723         register int nshorts;
 724
 725         if (Xflag) {
 726                 ascii_print(cp, length);
 727                 return;
 728         }
 729         nshorts = (u_int) length / sizeof(u_short);
 730         i = 0;
 731         while (--nshorts >= 0) {
 732                 if ((i++ % 8) == 0)
 733                         (void)printf("\n\t\t\t");
 734                 s = *cp++;
 735                 (void)printf(" %02x%02x", s, *cp++);
 736         }
 737         if (length & 1) {
 738                 if ((i % 8) == 0)
 739                         (void)printf("\n\t\t\t");
 740                 (void)printf(" %02x", *cp);
 741         }
 742 }
 743
 744 #ifdef WIN32
 745         /*
 746          * XXX - there should really be libpcap calls to get the version
 747          * number as a string (the string would be generated from #defines
 748          * at run time, so that it's not generated from string constants
 749          * in the library, as, on many UNIX systems, those constants would
 750          * be statically linked into the application executable image, and
 751          * would thus reflect the version of libpcap on the system on
 752          * which the application was *linked*, not the system on which it's
 753          * *running*.
 754          *
 755          * That routine should be documented, unlike the "version[]"
 756          * string, so that UNIX vendors providing their own libpcaps
 757          * don't omit it (as a couple of vendors have...).
 758          *
 759          * Packet.dll should perhaps also export a routine to return the
 760          * version number of the Packet.dll code, to supply the
 761          * "Wpcap_version" information on Windows.
 762          */
 763         char WDversion[]="current-cvs.tcpdump.org";
 764         char version[]="current-cvs.tcpdump.org";
 765         char pcap_version[]="current-cvs.tcpdump.org";
 766         char Wpcap_version[]="3.0 alpha";
 767 #endif
 768
 769 /*
 770  * By default, print the packet out in hex.
 771  */
 772 void
 773 default_print(register const u_char *bp, register u_int length)
 774 {
 775         default_print_unaligned(bp, length);
 776 }
 777
 778 #ifdef SIGINFO
 779 RETSIGTYPE requestinfo(int signo _U_)
 780 {
 781         if (infodelay)
 782                 ++infoprint;
 783         else
 784                 info(0);
 785 }
 786 #endif
 787
 788 static void
 789 usage(void)
 790 {
 791         extern char version[];
 792 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
 793         extern char pcap_version[];
 794 #else
 795         static char pcap_version[] = "unknown";
 796 #endif
 797
 798 #ifdef WIN32
 799         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
 800         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
 801 #else
 802         (void)fprintf(stderr, "%s version %s\n", program_name, version);
 803         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
 804 #endif /* WIN32 */
 805         (void)fprintf(stderr,
 806 #ifdef WIN32
 807 "Usage: %s [-aAdDeflnNOpqRStuvxX] [-B size] [-c count] [ -C file_size ]\n", program_name);
 808 #else /* WIN32 */
 809 #ifdef HAVE_PCAP_FINDALLDEVS
 810 "Usage: %s [-aAdDeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name);
 811 #else /* HAVE_PCAP_FINDALLDEVS */
 812 "Usage: %s [-aAdeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name);
 813 #endif /* HAVE_PCAP_FINDALLDEVS */
 814 #endif /* WIN32 */
 815         (void)fprintf(stderr,
 816 "\t\t[ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ]\n");
 817         (void)fprintf(stderr,
 818 "\t\t[ -T type ] [ -w file ] [ -E algo:secret ] [ expression ]\n");
 819         exit(1);
 820 }