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 1.189 2002-12-12 07:28:36 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_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 108 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 109
 110 #ifdef SIGINFO
 111 RETSIGTYPE requestinfo(int);
 112 #endif
 113
 114 /* Length of saved portion of packet. */
 115 int snaplen = DEFAULT_SNAPLEN;
 116
 117 struct printer {
 118         pcap_handler f;
 119         int type;
 120 };
 121
 122 static struct printer printers[] = {
 123         { arcnet_if_print,      DLT_ARCNET },
 124         { ether_if_print,       DLT_EN10MB },
 125         { token_if_print,       DLT_IEEE802 },
 126 #ifdef DLT_LANE8023
 127         { lane_if_print,        DLT_LANE8023 },
 128 #endif
 129 #ifdef DLT_CIP
 130         { cip_if_print,         DLT_CIP },
 131 #endif
 132 #ifdef DLT_ATM_CLIP
 133         { cip_if_print,         DLT_ATM_CLIP },
 134 #endif
 135         { sl_if_print,          DLT_SLIP },
 136         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 137         { ppp_if_print,         DLT_PPP },
 138         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 139         { fddi_if_print,        DLT_FDDI },
 140         { null_if_print,        DLT_NULL },
 141 #ifdef DLT_LOOP
 142         { null_if_print,        DLT_LOOP },
 143 #endif
 144         { raw_if_print,         DLT_RAW },
 145         { atm_if_print,         DLT_ATM_RFC1483 },
 146 #ifdef DLT_C_HDLC
 147         { chdlc_if_print,       DLT_C_HDLC },
 148 #endif
 149 #ifdef DLT_HDLC
 150         { chdlc_if_print,       DLT_HDLC },
 151 #endif
 152 #ifdef DLT_PPP_SERIAL
 153         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 154 #endif
 155 #ifdef DLT_PPP_ETHER
 156         { pppoe_if_print,       DLT_PPP_ETHER },
 157 #endif
 158 #ifdef DLT_LINUX_SLL
 159         { sll_if_print,         DLT_LINUX_SLL },
 160 #endif
 161 #ifdef DLT_IEEE802_11
 162         { ieee802_11_if_print,  DLT_IEEE802_11},
 163 #endif
 164 #ifdef DLT_LTALK
 165         { ltalk_if_print,       DLT_LTALK },
 166 #endif
 167 #ifdef DLT_PFLOG
 168         { pflog_if_print,       DLT_PFLOG },
 169 #endif
 170 #ifdef DLT_FR
 171         { fr_if_print,          DLT_FR },
 172 #endif
 173 #ifdef DLT_FRELAY
 174         { fr_if_print,          DLT_FRELAY },
 175 #endif
 176 #ifdef DLT_SUNATM
 177         { sunatm_if_print,      DLT_SUNATM },
 178 #endif
 179 #ifdef DLT_IP_OVER_FC
 180         { ipfc_if_print,        DLT_IP_OVER_FC },
 181 #endif
 182 #ifdef DLT_PRISM_HEADER
 183         { prism_if_print,       DLT_PRISM_HEADER },
 184 #endif
 185 #ifdef DLT_IEEE802_11_RADIO
 186         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 187 #endif
 188         { NULL,                 0 },
 189 };
 190
 191 static pcap_handler
 192 lookup_printer(int type)
 193 {
 194         struct printer *p;
 195
 196         for (p = printers; p->f; ++p)
 197                 if (type == p->type)
 198                         return p->f;
 199
 200         error("unknown data link type %d", type);
 201         /* NOTREACHED */
 202 }
 203
 204 static pcap_t *pd;
 205
 206 extern int optind;
 207 extern int opterr;
 208 extern char *optarg;
 209
 210 struct dump_info {
 211         char    *WFileName;
 212         pcap_t  *pd;
 213         pcap_dumper_t *p;
 214 };
 215
 216 int
 217 main(int argc, char **argv)
 218 {
 219         register int cnt, op, i;
 220         bpf_u_int32 localnet, netmask;
 221         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
 222         pcap_handler printer;
 223         struct bpf_program fcode;
 224 #ifndef WIN32
 225         RETSIGTYPE (*oldhandler)(int);
 226 #endif
 227         struct dump_info dumpinfo;
 228         u_char *pcap_userdata;
 229         char ebuf[PCAP_ERRBUF_SIZE];
 230 #ifdef HAVE_PCAP_FINDALLDEVS
 231         pcap_if_t *devpointer;
 232         int devnum;
 233 #endif
 234 #ifdef WIN32
 235         DWORD dwVersion;
 236         DWORD dwWindowsMajorVersion;
 237         u_int UserBufferSize=1000000;
 238 #endif
 239
 240 #ifdef WIN32
 241         dwVersion=GetVersion();         /* get the OS version */
 242         dwWindowsMajorVersion =  (DWORD)(LOBYTE(LOWORD(dwVersion)));
 243         if(wsockinit()!=0) return 1;
 244 #endif /* WIN32 */
 245
 246         cnt = -1;
 247         device = NULL;
 248         infile = NULL;
 249         RFileName = NULL;
 250         WFileName = NULL;
 251         if ((cp = strrchr(argv[0], '/')) != NULL)
 252                 program_name = cp + 1;
 253         else
 254                 program_name = argv[0];
 255
 256         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 257                 error("%s", ebuf);
 258
 259 #ifdef LIBSMI
 260         smiInit("tcpdump");
 261 #endif
 262
 263         opterr = 0;
 264         while (
 265 #ifdef WIN32
 266             (op = getopt(argc, argv, "aAB:c:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 267 #else /* WIN32 */
 268 #ifdef HAVE_PCAP_FINDALLDEVS
 269             (op = getopt(argc, argv, "aAc:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 270 #else /* HAVE_PCAP_FINDALLDEVS */
 271             (op = getopt(argc, argv, "aAc:C:deE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 272 #endif /* HAVE_PCAP_FINDALLDEVS */
 273 #endif /* WIN32 */
 274                 switch (op) {
 275
 276                 case 'a':
 277                         ++aflag;
 278                         break;
 279
 280                case 'A':
 281                        ++xflag;
 282                        ++Xflag;
 283                        ++Aflag;
 284                        break;
 285
 286 #ifdef WIN32
 287                 case 'B':
 288                         UserBufferSize = atoi(optarg)*1024;
 289                         if (UserBufferSize < 0)
 290                                 error("invalid packet buffer size %s", optarg);
 291                         break;
 292 #endif /* WIN32 */
 293
 294                 case 'c':
 295                         cnt = atoi(optarg);
 296                         if (cnt <= 0)
 297                                 error("invalid packet count %s", optarg);
 298                         break;
 299
 300                 case 'C':
 301                         Cflag = atoi(optarg) * 1000000;
 302                         if (Cflag < 0)
 303                                 error("invalid file size %s", optarg);
 304                         break;
 305
 306                 case 'd':
 307                         ++dflag;
 308                         break;
 309
 310 #ifdef HAVE_PCAP_FINDALLDEVS
 311                 case 'D':
 312                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 313                                 error("%s", ebuf);
 314                         else {
 315                                 for (i = 0; devpointer != 0; i++) {
 316                                         printf("%d.%s", i+1, devpointer->name);
 317                                         if (devpointer->description != NULL)
 318                                                 printf(" (%s)", devpointer->description);
 319                                         printf("\n");
 320                                         devpointer = devpointer->next;
 321                                 }
 322                         }
 323                         return 0;
 324 #endif /* HAVE_PCAP_FINDALLDEVS */
 325
 326                 case 'e':
 327                         ++eflag;
 328                         break;
 329
 330                 case 'E':
 331 #ifndef HAVE_LIBCRYPTO
 332                         warning("crypto code not compiled in");
 333 #endif
 334                         espsecret = optarg;
 335                         break;
 336
 337                 case 'f':
 338                         ++fflag;
 339                         break;
 340
 341                 case 'F':
 342                         infile = optarg;
 343                         break;
 344
 345                 case 'i':
 346                         if (optarg[0] == '0' && optarg[1] == 0)
 347                                 error("Invalid adapter index");
 348
 349 #ifdef HAVE_PCAP_FINDALLDEVS
 350                         /*
 351                          * If the argument is a number, treat it as
 352                          * an index into the list of adapters, as
 353                          * printed by "tcpdump -D".
 354                          *
 355                          * This should be OK on UNIX systems, as interfaces
 356                          * shouldn't have names that begin with digits.
 357                          * It can be useful on Windows, where more than
 358                          * one interface can have the same name.
 359                          */
 360                         if ((devnum = atoi(optarg)) != 0) {
 361                                 if (devnum < 0)
 362                                         error("Invalid adapter index");
 363
 364                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 365                                         error("%s", ebuf);
 366                                 else {
 367                                         for (i = 0; i < devnum-1; i++){
 368                                                 devpointer = devpointer->next;
 369                                                 if (devpointer == NULL)
 370                                                         error("Invalid adapter index");
 371                                         }
 372                                 }
 373                                 device = devpointer->name;
 374                                 break;
 375                         }
 376 #endif /* HAVE_PCAP_FINDALLDEVS */
 377                         device = optarg;
 378                         break;
 379
 380                 case 'l':
 381 #ifdef HAVE_SETLINEBUF
 382                         setlinebuf(stdout);
 383 #else
 384                         setvbuf(stdout, NULL, _IOLBF, 0);
 385 #endif
 386                         break;
 387
 388                 case 'n':
 389                         ++nflag;
 390                         break;
 391
 392                 case 'N':
 393                         ++Nflag;
 394                         break;
 395
 396                 case 'm':
 397 #ifdef LIBSMI
 398                         if (smiLoadModule(optarg) == 0) {
 399                                 error("could not load MIB module %s", optarg);
 400                         }
 401                         sflag = 1;
 402 #else
 403                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 404                                       program_name, optarg);
 405                         (void)fprintf(stderr, "(no libsmi support)\n");
 406 #endif
 407
 408                 case 'O':
 409                         Oflag = 0;
 410                         break;
 411
 412                 case 'p':
 413                         ++pflag;
 414                         break;
 415
 416                 case 'q':
 417                         ++qflag;
 418                         break;
 419
 420                 case 'r':
 421                         RFileName = optarg;
 422                         break;
 423
 424                 case 'R':
 425                         Rflag = 0;
 426                         break;
 427
 428                 case 's': {
 429                         char *end;
 430
 431                         snaplen = strtol(optarg, &end, 0);
 432                         if (optarg == end || *end != '\0'
 433                             || snaplen < 0 || snaplen > 65535)
 434                                 error("invalid snaplen %s", optarg);
 435                         else if (snaplen == 0)
 436                                 snaplen = 65535;
 437                         break;
 438                 }
 439
 440                 case 'S':
 441                         ++Sflag;
 442                         break;
 443
 444                 case 't':
 445                         --tflag;
 446                         break;
 447
 448                 case 'T':
 449                         if (strcasecmp(optarg, "vat") == 0)
 450                                 packettype = PT_VAT;
 451                         else if (strcasecmp(optarg, "wb") == 0)
 452                                 packettype = PT_WB;
 453                         else if (strcasecmp(optarg, "rpc") == 0)
 454                                 packettype = PT_RPC;
 455                         else if (strcasecmp(optarg, "rtp") == 0)
 456                                 packettype = PT_RTP;
 457                         else if (strcasecmp(optarg, "rtcp") == 0)
 458                                 packettype = PT_RTCP;
 459                         else if (strcasecmp(optarg, "snmp") == 0)
 460                                 packettype = PT_SNMP;
 461                         else if (strcasecmp(optarg, "cnfp") == 0)
 462                                 packettype = PT_CNFP;
 463                         else
 464                                 error("unknown packet type `%s'", optarg);
 465                         break;
 466
 467                 case 'u':
 468                         ++uflag;
 469                         break;
 470
 471                 case 'v':
 472                         ++vflag;
 473                         break;
 474
 475                 case 'w':
 476                         WFileName = optarg;
 477                         break;
 478
 479                 case 'x':
 480                         ++xflag;
 481                         break;
 482
 483                 case 'X':
 484                         ++xflag;
 485                         ++Xflag;
 486                         break;
 487
 488 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 489                 case 'Y':
 490                         {
 491                         /* Undocumented flag */
 492 #ifdef HAVE_PCAP_DEBUG
 493                         extern int pcap_debug;
 494                         pcap_debug = 1;
 495 #else
 496                         extern int yydebug;
 497                         yydebug = 1;
 498 #endif
 499                         }
 500                         break;
 501 #endif
 502                 default:
 503                         usage();
 504                         /* NOTREACHED */
 505                 }
 506
 507         if (aflag && nflag)
 508                 error("-a and -n options are incompatible");
 509
 510         if (tflag > 0)
 511                 thiszone = gmt2local(0);
 512
 513         if (RFileName != NULL) {
 514                 /*
 515                  * We don't need network access, so set it back to the user id.
 516                  * Also, this prevents the user from reading anyone's
 517                  * trace file.
 518                  */
 519 #ifndef WIN32
 520                 setuid(getuid());
 521 #endif /* WIN32 */
 522
 523                 pd = pcap_open_offline(RFileName, ebuf);
 524                 if (pd == NULL)
 525                         error("%s", ebuf);
 526                 localnet = 0;
 527                 netmask = 0;
 528                 if (fflag != 0)
 529                         error("-f and -r options are incompatible");
 530         } else {
 531                 if (device == NULL) {
 532                         device = pcap_lookupdev(ebuf);
 533                         if (device == NULL)
 534                                 error("%s", ebuf);
 535                 }
 536 #ifdef WIN32
 537                 PrintCapBegins(program_name,device);
 538 #endif /* WIN32 */
 539                 *ebuf = '\0';
 540                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
 541                 if (pd == NULL)
 542                         error("%s", ebuf);
 543                 else if (*ebuf)
 544                         warning("%s", ebuf);
 545 #ifdef WIN32
 546                 if(UserBufferSize != 1000000)
 547                         if(pcap_setbuff(pd, UserBufferSize)==-1){
 548                                 error("%s", pcap_geterr(pd));
 549                         }
 550 #endif /* WIN32 */
 551                 i = pcap_snapshot(pd);
 552                 if (snaplen < i) {
 553                         warning("snaplen raised from %d to %d", snaplen, i);
 554                         snaplen = i;
 555                 }
 556                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 557                         localnet = 0;
 558                         netmask = 0;
 559                         warning("%s", ebuf);
 560                 }
 561                 /*
 562                  * Let user own process after socket has been opened.
 563                  */
 564 #ifndef WIN32
 565                 setuid(getuid());
 566 #endif /* WIN32 */
 567         }
 568         if (infile)
 569                 cmdbuf = read_infile(infile);
 570         else
 571                 cmdbuf = copy_argv(&argv[optind]);
 572
 573         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 574                 error("%s", pcap_geterr(pd));
 575         if (dflag) {
 576                 bpf_dump(&fcode, dflag);
 577                 pcap_close(pd);
 578                 exit(0);
 579         }
 580         init_addrtoname(localnet, netmask);
 581
 582         (void)setsignal(SIGTERM, cleanup);
 583         (void)setsignal(SIGINT, cleanup);
 584         /* Cooperate with nohup(1) */
 585 #ifndef WIN32
 586         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
 587                 (void)setsignal(SIGHUP, oldhandler);
 588 #endif /* WIN32 */
 589
 590         if (pcap_setfilter(pd, &fcode) < 0)
 591                 error("%s", pcap_geterr(pd));
 592         if (WFileName) {
 593                 pcap_dumper_t *p = pcap_dump_open(pd, WFileName);
 594                 if (p == NULL)
 595                         error("%s", pcap_geterr(pd));
 596                 if (Cflag != 0) {
 597                         printer = dump_packet_and_trunc;
 598                         dumpinfo.WFileName = WFileName;
 599                         dumpinfo.pd = pd;
 600                         dumpinfo.p = p;
 601                         pcap_userdata = (u_char *)&dumpinfo;
 602                 } else {
 603                         printer = dump_packet;
 604                         pcap_userdata = (u_char *)p;
 605                 }
 606         } else {
 607                 printer = lookup_printer(pcap_datalink(pd));
 608                 pcap_userdata = 0;
 609         }
 610 #ifdef SIGINFO
 611         (void)setsignal(SIGINFO, requestinfo);
 612 #endif
 613 #ifndef WIN32
 614         if (RFileName == NULL) {
 615                 (void)fprintf(stderr, "%s: listening on %s\n",
 616                     program_name, device);
 617                 (void)fflush(stderr);
 618         }
 619 #endif /* WIN32 */
 620         if (pcap_loop(pd, cnt, printer, pcap_userdata) < 0) {
 621                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
 622                     program_name, pcap_geterr(pd));
 623                 cleanup(0);
 624                 pcap_close(pd);
 625                 exit(1);
 626         }
 627         if (RFileName == NULL)
 628                 info(1);
 629         pcap_close(pd);
 630         exit(0);
 631 }
 632
 633 /* make a clean exit on interrupts */
 634 static RETSIGTYPE
 635 cleanup(int signo)
 636 {
 637
 638         /* Can't print the summary if reading from a savefile */
 639         if (pd != NULL && pcap_file(pd) == NULL) {
 640                 (void)fflush(stdout);
 641                 putc('\n', stderr);
 642                 info(1);
 643         }
 644         if (signo)
 645                 exit(0);
 646 }
 647
 648 void
 649 info(register int verbose)
 650 {
 651         struct pcap_stat stat;
 652
 653         if (pcap_stats(pd, &stat) < 0) {
 654                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
 655                 return;
 656         }
 657
 658         if (!verbose)
 659                 fprintf(stderr, "%s: ", program_name);
 660
 661         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
 662         if (!verbose)
 663                 fputs(", ", stderr);
 664         else
 665                 putc('\n', stderr);
 666         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
 667         infoprint = 0;
 668 }
 669
 670 static void
 671 reverse(char *s)
 672 {
 673         int i, j, c;
 674
 675         for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
 676                 c = s[i];
 677                 s[i] = s[j];
 678                 s[j] = c;
 679         }
 680 }
 681
 682
 683 static void
 684 swebitoa(unsigned int n, char *s)
 685 {
 686         unsigned int i;
 687
 688         i = 0;
 689         do {
 690                 s[i++] = n % 10 + '0';
 691         } while ((n /= 10) > 0);
 692
 693         s[i] = '\0';
 694         reverse(s);
 695 }
 696
 697 static void
 698 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 699 {
 700         struct dump_info *dump_info;
 701         static uint cnt = 2;
 702         char *name;
 703
 704         ++infodelay;
 705
 706         dump_info = (struct dump_info *)user;
 707
 708         /*
 709          * XXX - this won't prevent capture files from getting
 710          * larger than Cflag - the last packet written to the
 711          * file could put it over Cflag.
 712          */
 713         if (ftell((FILE *)dump_info->p) > Cflag) {
 714                 name = (char *) malloc(strlen(dump_info->WFileName) + 4);
 715                 if (name == NULL)
 716                         error("dump_packet_and_trunc: malloc");
 717                 strcpy(name, dump_info->WFileName);
 718                 swebitoa(cnt, name + strlen(dump_info->WFileName));
 719                 cnt++;
 720                 pcap_dump_close(dump_info->p);
 721                 dump_info->p = pcap_dump_open(dump_info->pd, name);
 722                 free(name);
 723                 if (dump_info->p == NULL)
 724                         error("%s", pcap_geterr(pd));
 725         }
 726
 727         pcap_dump((u_char *)dump_info->p, h, sp);
 728
 729         --infodelay;
 730         if (infoprint)
 731                 info(0);
 732 }
 733
 734 static void
 735 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 736 {
 737         ++infodelay;
 738
 739         pcap_dump(user, h, sp);
 740
 741         --infodelay;
 742         if (infoprint)
 743                 info(0);
 744 }
 745
 746 /* Like default_print() but data need not be aligned */
 747 void
 748 default_print_unaligned(register const u_char *cp, register u_int length)
 749 {
 750         register u_int i, s;
 751         register int nshorts;
 752
 753         if (Xflag) {
 754                 ascii_print(cp, length);
 755                 return;
 756         }
 757         nshorts = (u_int) length / sizeof(u_short);
 758         i = 0;
 759         while (--nshorts >= 0) {
 760                 if ((i++ % 8) == 0)
 761                         (void)printf("\n\t\t\t");
 762                 s = *cp++;
 763                 (void)printf(" %02x%02x", s, *cp++);
 764         }
 765         if (length & 1) {
 766                 if ((i % 8) == 0)
 767                         (void)printf("\n\t\t\t");
 768                 (void)printf(" %02x", *cp);
 769         }
 770 }
 771
 772 #ifdef WIN32
 773         /*
 774          * XXX - there should really be libpcap calls to get the version
 775          * number as a string (the string would be generated from #defines
 776          * at run time, so that it's not generated from string constants
 777          * in the library, as, on many UNIX systems, those constants would
 778          * be statically linked into the application executable image, and
 779          * would thus reflect the version of libpcap on the system on
 780          * which the application was *linked*, not the system on which it's
 781          * *running*.
 782          *
 783          * That routine should be documented, unlike the "version[]"
 784          * string, so that UNIX vendors providing their own libpcaps
 785          * don't omit it (as a couple of vendors have...).
 786          *
 787          * Packet.dll should perhaps also export a routine to return the
 788          * version number of the Packet.dll code, to supply the
 789          * "Wpcap_version" information on Windows.
 790          */
 791         char WDversion[]="current-cvs.tcpdump.org";
 792         char version[]="current-cvs.tcpdump.org";
 793         char pcap_version[]="current-cvs.tcpdump.org";
 794         char Wpcap_version[]="3.0 alpha";
 795 #endif
 796
 797 /*
 798  * By default, print the packet out in hex.
 799  */
 800 void
 801 default_print(register const u_char *bp, register u_int length)
 802 {
 803         default_print_unaligned(bp, length);
 804 }
 805
 806 #ifdef SIGINFO
 807 RETSIGTYPE requestinfo(int signo _U_)
 808 {
 809         if (infodelay)
 810                 ++infoprint;
 811         else
 812                 info(0);
 813 }
 814 #endif
 815
 816 static void
 817 usage(void)
 818 {
 819         extern char version[];
 820 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
 821         extern char pcap_version[];
 822 #else
 823         static char pcap_version[] = "unknown";
 824 #endif
 825
 826 #ifdef WIN32
 827         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
 828         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
 829 #else
 830         (void)fprintf(stderr, "%s version %s\n", program_name, version);
 831         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
 832 #endif /* WIN32 */
 833         (void)fprintf(stderr,
 834 #ifdef WIN32
 835 "Usage: %s [-aAdDeflnNOpqRStuvxX] [-B size] [-c count] [ -C file_size ]\n", program_name);
 836 #else /* WIN32 */
 837 #ifdef HAVE_PCAP_FINDALLDEVS
 838 "Usage: %s [-aAdDeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name);
 839 #else /* HAVE_PCAP_FINDALLDEVS */
 840 "Usage: %s [-aAdeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name);
 841 #endif /* HAVE_PCAP_FINDALLDEVS */
 842 #endif /* WIN32 */
 843         (void)fprintf(stderr,
 844 "\t\t[ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ]\n");
 845         (void)fprintf(stderr,
 846 "\t\t[ -T type ] [ -w file ] [ -E algo:secret ] [ expression ]\n");
 847         exit(1);
 848 }