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 1.180 2002-08-01 08:53:37 risso 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         pcap_if_t *devpointer;
 221         int devnum;
 222 #ifdef WIN32
 223         int ii;
 224         DWORD dwVersion;
 225         DWORD dwWindowsMajorVersion;
 226         u_int UserBufferSize=1000000;
 227 #endif
 228
 229 #ifdef WIN32
 230         dwVersion=GetVersion();         /* get the OS version */
 231         dwWindowsMajorVersion =  (DWORD)(LOBYTE(LOWORD(dwVersion)));
 232         if(wsockinit()!=0) return 1;
 233 #endif /* WIN32 */
 234
 235         cnt = -1;
 236         device = NULL;
 237         infile = NULL;
 238         RFileName = NULL;
 239         WFileName = NULL;
 240         if ((cp = strrchr(argv[0], '/')) != NULL)
 241                 program_name = cp + 1;
 242         else
 243                 program_name = argv[0];
 244
 245         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 246                 error("%s", ebuf);
 247
 248 #ifdef LIBSMI
 249         smiInit("tcpdump");
 250 #endif
 251
 252         opterr = 0;
 253         while (
 254 #ifdef WIN32
 255             (op = getopt(argc, argv, "aB:c:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 256 #else
 257             (op = getopt(argc, argv, "ac:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 258 #endif /* WIN32 */
 259                 switch (op) {
 260
 261                 case 'a':
 262                         ++aflag;
 263                         break;
 264
 265                case 'A':
 266                        ++xflag;
 267                        ++Xflag;
 268                        ++Aflag;
 269                        break;
 270
 271 #ifdef WIN32
 272                 case 'B':
 273                         UserBufferSize = atoi(optarg)*1024;
 274                         if (UserBufferSize < 0)
 275                                 error("invalid packet buffer size %s", optarg);
 276                         break;
 277 #endif /* WIN32 */
 278
 279                 case 'c':
 280                         cnt = atoi(optarg);
 281                         if (cnt <= 0)
 282                                 error("invalid packet count %s", optarg);
 283                         break;
 284
 285                 case 'C':
 286                         Cflag = atoi(optarg) * 1000000;
 287                         if (Cflag < 0)
 288                                 error("invalid file size %s", optarg);
 289                         break;
 290
 291                 case 'd':
 292                         ++dflag;
 293                         break;
 294
 295                 case 'D':
 296                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 297                                 error("%s", ebuf);
 298                         else {
 299                                 for (i = 0; devpointer != 0; i++) {
 300                                         printf("%d.%s", i+1, devpointer->name);
 301                                         if (devpointer->description != NULL)
 302                                                 printf(" (%s)", devpointer->description);
 303                                         printf("\n");
 304                                         devpointer = devpointer->next;
 305                                 }
 306                         }
 307                         return 0;
 308
 309                 case 'e':
 310                         ++eflag;
 311                         break;
 312
 313                 case 'E':
 314 #ifndef HAVE_LIBCRYPTO
 315                         warning("crypto code not compiled in");
 316 #endif
 317                         espsecret = optarg;
 318                         break;
 319
 320                 case 'f':
 321                         ++fflag;
 322                         break;
 323
 324                 case 'F':
 325                         infile = optarg;
 326                         break;
 327
 328                 case 'i':
 329                         if (optarg[0] == '0' && optarg[1] == 0)
 330                                 error("Invalid adapter index");
 331
 332                         /*
 333                          * If the argument is a number, treat it as
 334                          * an index into the list of adapters, as
 335                          * printed by "tcpdump -D".
 336                          *
 337                          * This should be OK on UNIX systems, as interfaces
 338                          * shouldn't have names that begin with digits.
 339                          * It can be useful on Windows, where more than
 340                          * one interface can have the same name.
 341                          */
 342                         if ((devnum = atoi(optarg)) != 0) {
 343                                 if (devnum < 0)
 344                                         error("Invalid adapter index");
 345
 346                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 347                                         error("%s", ebuf);
 348                                 else {
 349                                         for (i = 0; i < devnum-1; i++){
 350                                                 devpointer = devpointer->next;
 351                                                 if (devpointer == NULL)
 352                                                         error("Invalid adapter index");
 353                                         }
 354                                 }
 355                                 device = devpointer->name;
 356                                 break;
 357                         }
 358                         device = optarg;
 359                         break;
 360
 361                 case 'l':
 362 #ifdef HAVE_SETLINEBUF
 363                         setlinebuf(stdout);
 364 #else
 365                         setvbuf(stdout, NULL, _IOLBF, 0);
 366 #endif
 367                         break;
 368
 369                 case 'n':
 370                         ++nflag;
 371                         break;
 372
 373                 case 'N':
 374                         ++Nflag;
 375                         break;
 376
 377                 case 'm':
 378 #ifdef LIBSMI
 379                         if (smiLoadModule(optarg) == 0) {
 380                                 error("could not load MIB module %s", optarg);
 381                         }
 382                         sflag = 1;
 383 #else
 384                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 385                                       program_name, optarg);
 386                         (void)fprintf(stderr, "(no libsmi support)\n");
 387 #endif
 388
 389                 case 'O':
 390                         Oflag = 0;
 391                         break;
 392
 393                 case 'p':
 394                         ++pflag;
 395                         break;
 396
 397                 case 'q':
 398                         ++qflag;
 399                         break;
 400
 401                 case 'r':
 402                         RFileName = optarg;
 403                         break;
 404
 405                 case 'R':
 406                         Rflag = 0;
 407                         break;
 408
 409                 case 's': {
 410                         char *end;
 411
 412                         snaplen = strtol(optarg, &end, 0);
 413                         if (optarg == end || *end != '\0'
 414                             || snaplen < 0 || snaplen > 65535)
 415                                 error("invalid snaplen %s", optarg);
 416                         else if (snaplen == 0)
 417                                 snaplen = 65535;
 418                         break;
 419                 }
 420
 421                 case 'S':
 422                         ++Sflag;
 423                         break;
 424
 425                 case 't':
 426                         --tflag;
 427                         break;
 428
 429                 case 'T':
 430                         if (strcasecmp(optarg, "vat") == 0)
 431                                 packettype = PT_VAT;
 432                         else if (strcasecmp(optarg, "wb") == 0)
 433                                 packettype = PT_WB;
 434                         else if (strcasecmp(optarg, "rpc") == 0)
 435                                 packettype = PT_RPC;
 436                         else if (strcasecmp(optarg, "rtp") == 0)
 437                                 packettype = PT_RTP;
 438                         else if (strcasecmp(optarg, "rtcp") == 0)
 439                                 packettype = PT_RTCP;
 440                         else if (strcasecmp(optarg, "snmp") == 0)
 441                                 packettype = PT_SNMP;
 442                         else if (strcasecmp(optarg, "cnfp") == 0)
 443                                 packettype = PT_CNFP;
 444                         else
 445                                 error("unknown packet type `%s'", optarg);
 446                         break;
 447
 448                 case 'u':
 449                         ++uflag;
 450                         break;
 451
 452                 case 'v':
 453                         ++vflag;
 454                         break;
 455
 456                 case 'w':
 457                         WFileName = optarg;
 458                         break;
 459
 460                 case 'x':
 461                         ++xflag;
 462                         break;
 463
 464                 case 'X':
 465                         ++xflag;
 466                         ++Xflag;
 467                         break;
 468
 469 #ifdef YYDEBUG
 470                 case 'Y':
 471                         {
 472                         /* Undocumented flag */
 473                         extern int yydebug;
 474                         yydebug = 1;
 475                         }
 476                         break;
 477 #endif
 478                 default:
 479                         usage();
 480                         /* NOTREACHED */
 481                 }
 482
 483         if (aflag && nflag)
 484                 error("-a and -n options are incompatible");
 485
 486         if (tflag > 0)
 487                 thiszone = gmt2local(0);
 488
 489         if (RFileName != NULL) {
 490                 /*
 491                  * We don't need network access, so set it back to the user id.
 492                  * Also, this prevents the user from reading anyone's
 493                  * trace file.
 494                  */
 495 #ifndef WIN32
 496                 setuid(getuid());
 497 #endif /* WIN32 */
 498
 499                 pd = pcap_open_offline(RFileName, ebuf);
 500                 if (pd == NULL)
 501                         error("%s", ebuf);
 502                 localnet = 0;
 503                 netmask = 0;
 504                 if (fflag != 0)
 505                         error("-f and -r options are incompatible");
 506         } else {
 507                 if (device == NULL) {
 508                         device = pcap_lookupdev(ebuf);
 509                         if (device == NULL)
 510                                 error("%s", ebuf);
 511                 }
 512 #ifdef WIN32
 513                 else
 514                 {
 515                         if (!(dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4))                   /* Windows '95 */
 516                         {
 517                                 if(device[1]!=0)
 518                                         device=(char*)SChar2WChar(device);
 519                         }
 520                         else{
 521                                 for (ii=0;ii<(signed)strlen(device);ii++)
 522                                 for (ii=strlen(device)-1;ii>0&&(device[ii]==' '||device[ii]=='\t');ii--)device[ii]='\0';
 523                                 for (ii=0;ii<(signed)strlen(device)&&(device[ii]==' '||device[ii]=='\t');ii++);
 524                                 strcpy(device,device+ii);
 525                         }
 526                 }
 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 #ifdef WIN32
 568             pcap_close(pd);
 569 #endif /* WIN32 */
 570                 exit(0);
 571         }
 572         init_addrtoname(localnet, netmask);
 573
 574         (void)setsignal(SIGTERM, cleanup);
 575         (void)setsignal(SIGINT, cleanup);
 576         /* Cooperate with nohup(1) */
 577 #ifndef WIN32
 578         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
 579                 (void)setsignal(SIGHUP, oldhandler);
 580 #endif /* WIN32 */
 581
 582         if (pcap_setfilter(pd, &fcode) < 0)
 583                 error("%s", pcap_geterr(pd));
 584         if (WFileName) {
 585                 pcap_dumper_t *p = pcap_dump_open(pd, WFileName);
 586                 if (p == NULL)
 587                         error("%s", pcap_geterr(pd));
 588                 if (Cflag != 0) {
 589                         printer = dump_and_trunc;
 590                         dumpinfo.WFileName = WFileName;
 591                         dumpinfo.pd = pd;
 592                         dumpinfo.p = p;
 593                         pcap_userdata = (u_char *)&dumpinfo;
 594                 } else {
 595                         printer = pcap_dump;
 596                         pcap_userdata = (u_char *)p;
 597                 }
 598         } else {
 599                 printer = lookup_printer(pcap_datalink(pd));
 600                 pcap_userdata = 0;
 601 #ifdef SIGINFO
 602                 (void)setsignal(SIGINFO, requestinfo);
 603 #endif
 604         }
 605 #ifndef WIN32
 606         if (RFileName == NULL) {
 607                 (void)fprintf(stderr, "%s: listening on %s\n",
 608                     program_name, device);
 609                 (void)fflush(stderr);
 610         }
 611 #endif /* WIN32 */
 612         if (pcap_loop(pd, cnt, printer, pcap_userdata) < 0) {
 613                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
 614                     program_name, pcap_geterr(pd));
 615                 cleanup(0);
 616                 pcap_close(pd);
 617                 exit(1);
 618         }
 619         if (RFileName == NULL)
 620                 info(1);
 621         pcap_close(pd);
 622         exit(0);
 623 }
 624
 625 /* make a clean exit on interrupts */
 626 static RETSIGTYPE
 627 cleanup(int signo)
 628 {
 629
 630         /* Can't print the summary if reading from a savefile */
 631         if (pd != NULL && pcap_file(pd) == NULL) {
 632                 (void)fflush(stdout);
 633                 putc('\n', stderr);
 634                 info(1);
 635         }
 636         if (signo)
 637                 exit(0);
 638 }
 639
 640 void
 641 info(register int verbose)
 642 {
 643         struct pcap_stat stat;
 644
 645         if (pcap_stats(pd, &stat) < 0) {
 646                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
 647                 return;
 648         }
 649
 650         if (!verbose)
 651                 fprintf(stderr, "%s: ", program_name);
 652
 653         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
 654         if (!verbose)
 655                 fputs(", ", stderr);
 656         else
 657                 putc('\n', stderr);
 658         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
 659         infoprint = 0;
 660 }
 661
 662 static void
 663 reverse(char *s)
 664 {
 665         int i, j, c;
 666
 667         for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
 668                 c = s[i];
 669                 s[i] = s[j];
 670                 s[j] = c;
 671         }
 672 }
 673
 674
 675 static void
 676 swebitoa(unsigned int n, char *s)
 677 {
 678         unsigned int i;
 679
 680         i = 0;
 681         do {
 682                 s[i++] = n % 10 + '0';
 683         } while ((n /= 10) > 0);
 684
 685         s[i] = '\0';
 686         reverse(s);
 687 }
 688
 689 static void
 690 dump_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 691 {
 692         struct dump_info *info;
 693         static uint cnt = 2;
 694         char *name;
 695
 696         info = (struct dump_info *)user;
 697
 698         /*
 699          * XXX - this won't prevent capture files from getting
 700          * larger than Cflag - the last packet written to the
 701          * file could put it over Cflag.
 702          */
 703         if (ftell((FILE *)info->p) > Cflag) {
 704                 name = (char *) malloc(strlen(info->WFileName) + 4);
 705                 if (name == NULL)
 706                         error("dump_and_trunc: malloc");
 707                 strcpy(name, info->WFileName);
 708                 swebitoa(cnt, name + strlen(info->WFileName));
 709                 cnt++;
 710                 pcap_dump_close(info->p);
 711                 info->p = pcap_dump_open(info->pd, name);
 712                 free(name);
 713                 if (info->p == NULL)
 714                         error("%s", pcap_geterr(pd));
 715         }
 716
 717         pcap_dump((u_char *)info->p, h, sp);
 718 }
 719
 720 /* Like default_print() but data need not be aligned */
 721 void
 722 default_print_unaligned(register const u_char *cp, register u_int length)
 723 {
 724         register u_int i, s;
 725         register int nshorts;
 726
 727         if (Xflag) {
 728                 ascii_print(cp, length);
 729                 return;
 730         }
 731         nshorts = (u_int) length / sizeof(u_short);
 732         i = 0;
 733         while (--nshorts >= 0) {
 734                 if ((i++ % 8) == 0)
 735                         (void)printf("\n\t\t\t");
 736                 s = *cp++;
 737                 (void)printf(" %02x%02x", s, *cp++);
 738         }
 739         if (length & 1) {
 740                 if ((i % 8) == 0)
 741                         (void)printf("\n\t\t\t");
 742                 (void)printf(" %02x", *cp);
 743         }
 744 }
 745
 746 #ifdef WIN32
 747         char WDversion[]="current-cvs.tcpdump.org";
 748         char version[]="current-cvs.tcpdump.org";
 749         char pcap_version[]="current-cvs.tcpdump.org";
 750         char Wpcap_version[]="3.0 alpha";
 751 #endif
 752
 753 /*
 754  * By default, print the packet out in hex.
 755  */
 756 void
 757 default_print(register const u_char *bp, register u_int length)
 758 {
 759         default_print_unaligned(bp, length);
 760 }
 761
 762 #ifdef SIGINFO
 763 RETSIGTYPE requestinfo(int signo)
 764 {
 765         if (infodelay)
 766                 ++infoprint;
 767         else
 768                 info(0);
 769 }
 770 #endif
 771
 772 static void
 773 usage(void)
 774 {
 775         extern char version[];
 776         extern char pcap_version[];
 777
 778 #ifdef WIN32
 779         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
 780         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
 781 #else
 782         (void)fprintf(stderr, "%s version %s\n", program_name, version);
 783         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
 784 #endif /* WIN32 */
 785         (void)fprintf(stderr,
 786 #ifdef WIN32
 787 "Usage: %s [-adDeflnNOpqStuvxX] [-B size] [-c count] [ -C file_size ]\n", program_name);
 788 #else
 789 "Usage: %s [-adDeflnNOpqStuvxX] [-c count] [ -C file_size ]\n", program_name);
 790 #endif /* WIN32 */
 791         (void)fprintf(stderr,
 792 "\t\t[ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ]\n");
 793         (void)fprintf(stderr,
 794 "\t\t[ -T type ] [ -w file ] [ -E algo:secret ] [ expression ]\n");
 795         exit(1);
 796 }