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 1.188 2002-11-11 19:54:40 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         { NULL,                 0 },
 183 };
 184
 185 static pcap_handler
 186 lookup_printer(int type)
 187 {
 188         struct printer *p;
 189
 190         for (p = printers; p->f; ++p)
 191                 if (type == p->type)
 192                         return p->f;
 193
 194         error("unknown data link type %d", type);
 195         /* NOTREACHED */
 196 }
 197
 198 static pcap_t *pd;
 199
 200 extern int optind;
 201 extern int opterr;
 202 extern char *optarg;
 203
 204 struct dump_info {
 205         char    *WFileName;
 206         pcap_t  *pd;
 207         pcap_dumper_t *p;
 208 };
 209
 210 int
 211 main(int argc, char **argv)
 212 {
 213         register int cnt, op, i;
 214         bpf_u_int32 localnet, netmask;
 215         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
 216         pcap_handler printer;
 217         struct bpf_program fcode;
 218 #ifndef WIN32
 219         RETSIGTYPE (*oldhandler)(int);
 220 #endif
 221         struct dump_info dumpinfo;
 222         u_char *pcap_userdata;
 223         char ebuf[PCAP_ERRBUF_SIZE];
 224 #ifdef HAVE_PCAP_FINDALLDEVS
 225         pcap_if_t *devpointer;
 226         int devnum;
 227 #endif
 228 #ifdef WIN32
 229         DWORD dwVersion;
 230         DWORD dwWindowsMajorVersion;
 231         u_int UserBufferSize=1000000;
 232 #endif
 233
 234 #ifdef WIN32
 235         dwVersion=GetVersion();         /* get the OS version */
 236         dwWindowsMajorVersion =  (DWORD)(LOBYTE(LOWORD(dwVersion)));
 237         if(wsockinit()!=0) return 1;
 238 #endif /* WIN32 */
 239
 240         cnt = -1;
 241         device = NULL;
 242         infile = NULL;
 243         RFileName = NULL;
 244         WFileName = NULL;
 245         if ((cp = strrchr(argv[0], '/')) != NULL)
 246                 program_name = cp + 1;
 247         else
 248                 program_name = argv[0];
 249
 250         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 251                 error("%s", ebuf);
 252
 253 #ifdef LIBSMI
 254         smiInit("tcpdump");
 255 #endif
 256
 257         opterr = 0;
 258         while (
 259 #ifdef WIN32
 260             (op = getopt(argc, argv, "aAB:c:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 261 #else /* WIN32 */
 262 #ifdef HAVE_PCAP_FINDALLDEVS
 263             (op = getopt(argc, argv, "aAc:C:dDeE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 264 #else /* HAVE_PCAP_FINDALLDEVS */
 265             (op = getopt(argc, argv, "aAc:C:deE:fF:i:lm:nNOpqr:Rs:StT:uvw:xXY")) != -1)
 266 #endif /* HAVE_PCAP_FINDALLDEVS */
 267 #endif /* WIN32 */
 268                 switch (op) {
 269
 270                 case 'a':
 271                         ++aflag;
 272                         break;
 273
 274                case 'A':
 275                        ++xflag;
 276                        ++Xflag;
 277                        ++Aflag;
 278                        break;
 279
 280 #ifdef WIN32
 281                 case 'B':
 282                         UserBufferSize = atoi(optarg)*1024;
 283                         if (UserBufferSize < 0)
 284                                 error("invalid packet buffer size %s", optarg);
 285                         break;
 286 #endif /* WIN32 */
 287
 288                 case 'c':
 289                         cnt = atoi(optarg);
 290                         if (cnt <= 0)
 291                                 error("invalid packet count %s", optarg);
 292                         break;
 293
 294                 case 'C':
 295                         Cflag = atoi(optarg) * 1000000;
 296                         if (Cflag < 0)
 297                                 error("invalid file size %s", optarg);
 298                         break;
 299
 300                 case 'd':
 301                         ++dflag;
 302                         break;
 303
 304 #ifdef HAVE_PCAP_FINDALLDEVS
 305                 case 'D':
 306                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 307                                 error("%s", ebuf);
 308                         else {
 309                                 for (i = 0; devpointer != 0; i++) {
 310                                         printf("%d.%s", i+1, devpointer->name);
 311                                         if (devpointer->description != NULL)
 312                                                 printf(" (%s)", devpointer->description);
 313                                         printf("\n");
 314                                         devpointer = devpointer->next;
 315                                 }
 316                         }
 317                         return 0;
 318 #endif /* HAVE_PCAP_FINDALLDEVS */
 319
 320                 case 'e':
 321                         ++eflag;
 322                         break;
 323
 324                 case 'E':
 325 #ifndef HAVE_LIBCRYPTO
 326                         warning("crypto code not compiled in");
 327 #endif
 328                         espsecret = optarg;
 329                         break;
 330
 331                 case 'f':
 332                         ++fflag;
 333                         break;
 334
 335                 case 'F':
 336                         infile = optarg;
 337                         break;
 338
 339                 case 'i':
 340                         if (optarg[0] == '0' && optarg[1] == 0)
 341                                 error("Invalid adapter index");
 342
 343 #ifdef HAVE_PCAP_FINDALLDEVS
 344                         /*
 345                          * If the argument is a number, treat it as
 346                          * an index into the list of adapters, as
 347                          * printed by "tcpdump -D".
 348                          *
 349                          * This should be OK on UNIX systems, as interfaces
 350                          * shouldn't have names that begin with digits.
 351                          * It can be useful on Windows, where more than
 352                          * one interface can have the same name.
 353                          */
 354                         if ((devnum = atoi(optarg)) != 0) {
 355                                 if (devnum < 0)
 356                                         error("Invalid adapter index");
 357
 358                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 359                                         error("%s", ebuf);
 360                                 else {
 361                                         for (i = 0; i < devnum-1; i++){
 362                                                 devpointer = devpointer->next;
 363                                                 if (devpointer == NULL)
 364                                                         error("Invalid adapter index");
 365                                         }
 366                                 }
 367                                 device = devpointer->name;
 368                                 break;
 369                         }
 370 #endif /* HAVE_PCAP_FINDALLDEVS */
 371                         device = optarg;
 372                         break;
 373
 374                 case 'l':
 375 #ifdef HAVE_SETLINEBUF
 376                         setlinebuf(stdout);
 377 #else
 378                         setvbuf(stdout, NULL, _IOLBF, 0);
 379 #endif
 380                         break;
 381
 382                 case 'n':
 383                         ++nflag;
 384                         break;
 385
 386                 case 'N':
 387                         ++Nflag;
 388                         break;
 389
 390                 case 'm':
 391 #ifdef LIBSMI
 392                         if (smiLoadModule(optarg) == 0) {
 393                                 error("could not load MIB module %s", optarg);
 394                         }
 395                         sflag = 1;
 396 #else
 397                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 398                                       program_name, optarg);
 399                         (void)fprintf(stderr, "(no libsmi support)\n");
 400 #endif
 401
 402                 case 'O':
 403                         Oflag = 0;
 404                         break;
 405
 406                 case 'p':
 407                         ++pflag;
 408                         break;
 409
 410                 case 'q':
 411                         ++qflag;
 412                         break;
 413
 414                 case 'r':
 415                         RFileName = optarg;
 416                         break;
 417
 418                 case 'R':
 419                         Rflag = 0;
 420                         break;
 421
 422                 case 's': {
 423                         char *end;
 424
 425                         snaplen = strtol(optarg, &end, 0);
 426                         if (optarg == end || *end != '\0'
 427                             || snaplen < 0 || snaplen > 65535)
 428                                 error("invalid snaplen %s", optarg);
 429                         else if (snaplen == 0)
 430                                 snaplen = 65535;
 431                         break;
 432                 }
 433
 434                 case 'S':
 435                         ++Sflag;
 436                         break;
 437
 438                 case 't':
 439                         --tflag;
 440                         break;
 441
 442                 case 'T':
 443                         if (strcasecmp(optarg, "vat") == 0)
 444                                 packettype = PT_VAT;
 445                         else if (strcasecmp(optarg, "wb") == 0)
 446                                 packettype = PT_WB;
 447                         else if (strcasecmp(optarg, "rpc") == 0)
 448                                 packettype = PT_RPC;
 449                         else if (strcasecmp(optarg, "rtp") == 0)
 450                                 packettype = PT_RTP;
 451                         else if (strcasecmp(optarg, "rtcp") == 0)
 452                                 packettype = PT_RTCP;
 453                         else if (strcasecmp(optarg, "snmp") == 0)
 454                                 packettype = PT_SNMP;
 455                         else if (strcasecmp(optarg, "cnfp") == 0)
 456                                 packettype = PT_CNFP;
 457                         else
 458                                 error("unknown packet type `%s'", optarg);
 459                         break;
 460
 461                 case 'u':
 462                         ++uflag;
 463                         break;
 464
 465                 case 'v':
 466                         ++vflag;
 467                         break;
 468
 469                 case 'w':
 470                         WFileName = optarg;
 471                         break;
 472
 473                 case 'x':
 474                         ++xflag;
 475                         break;
 476
 477                 case 'X':
 478                         ++xflag;
 479                         ++Xflag;
 480                         break;
 481
 482 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 483                 case 'Y':
 484                         {
 485                         /* Undocumented flag */
 486 #ifdef HAVE_PCAP_DEBUG
 487                         extern int pcap_debug;
 488                         pcap_debug = 1;
 489 #else
 490                         extern int yydebug;
 491                         yydebug = 1;
 492 #endif
 493                         }
 494                         break;
 495 #endif
 496                 default:
 497                         usage();
 498                         /* NOTREACHED */
 499                 }
 500
 501         if (aflag && nflag)
 502                 error("-a and -n options are incompatible");
 503
 504         if (tflag > 0)
 505                 thiszone = gmt2local(0);
 506
 507         if (RFileName != NULL) {
 508                 /*
 509                  * We don't need network access, so set it back to the user id.
 510                  * Also, this prevents the user from reading anyone's
 511                  * trace file.
 512                  */
 513 #ifndef WIN32
 514                 setuid(getuid());
 515 #endif /* WIN32 */
 516
 517                 pd = pcap_open_offline(RFileName, ebuf);
 518                 if (pd == NULL)
 519                         error("%s", ebuf);
 520                 localnet = 0;
 521                 netmask = 0;
 522                 if (fflag != 0)
 523                         error("-f and -r options are incompatible");
 524         } else {
 525                 if (device == NULL) {
 526                         device = pcap_lookupdev(ebuf);
 527                         if (device == NULL)
 528                                 error("%s", ebuf);
 529                 }
 530 #ifdef WIN32
 531                 PrintCapBegins(program_name,device);
 532 #endif /* WIN32 */
 533                 *ebuf = '\0';
 534                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
 535                 if (pd == NULL)
 536                         error("%s", ebuf);
 537                 else if (*ebuf)
 538                         warning("%s", ebuf);
 539 #ifdef WIN32
 540                 if(UserBufferSize != 1000000)
 541                         if(pcap_setbuff(pd, UserBufferSize)==-1){
 542                                 error("%s", pcap_geterr(pd));
 543                         }
 544 #endif /* WIN32 */
 545                 i = pcap_snapshot(pd);
 546                 if (snaplen < i) {
 547                         warning("snaplen raised from %d to %d", snaplen, i);
 548                         snaplen = i;
 549                 }
 550                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 551                         localnet = 0;
 552                         netmask = 0;
 553                         warning("%s", ebuf);
 554                 }
 555                 /*
 556                  * Let user own process after socket has been opened.
 557                  */
 558 #ifndef WIN32
 559                 setuid(getuid());
 560 #endif /* WIN32 */
 561         }
 562         if (infile)
 563                 cmdbuf = read_infile(infile);
 564         else
 565                 cmdbuf = copy_argv(&argv[optind]);
 566
 567         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 568                 error("%s", pcap_geterr(pd));
 569         if (dflag) {
 570                 bpf_dump(&fcode, dflag);
 571                 pcap_close(pd);
 572                 exit(0);
 573         }
 574         init_addrtoname(localnet, netmask);
 575
 576         (void)setsignal(SIGTERM, cleanup);
 577         (void)setsignal(SIGINT, cleanup);
 578         /* Cooperate with nohup(1) */
 579 #ifndef WIN32
 580         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
 581                 (void)setsignal(SIGHUP, oldhandler);
 582 #endif /* WIN32 */
 583
 584         if (pcap_setfilter(pd, &fcode) < 0)
 585                 error("%s", pcap_geterr(pd));
 586         if (WFileName) {
 587                 pcap_dumper_t *p = pcap_dump_open(pd, WFileName);
 588                 if (p == NULL)
 589                         error("%s", pcap_geterr(pd));
 590                 if (Cflag != 0) {
 591                         printer = dump_packet_and_trunc;
 592                         dumpinfo.WFileName = WFileName;
 593                         dumpinfo.pd = pd;
 594                         dumpinfo.p = p;
 595                         pcap_userdata = (u_char *)&dumpinfo;
 596                 } else {
 597                         printer = dump_packet;
 598                         pcap_userdata = (u_char *)p;
 599                 }
 600         } else {
 601                 printer = lookup_printer(pcap_datalink(pd));
 602                 pcap_userdata = 0;
 603         }
 604 #ifdef SIGINFO
 605         (void)setsignal(SIGINFO, requestinfo);
 606 #endif
 607 #ifndef WIN32
 608         if (RFileName == NULL) {
 609                 (void)fprintf(stderr, "%s: listening on %s\n",
 610                     program_name, device);
 611                 (void)fflush(stderr);
 612         }
 613 #endif /* WIN32 */
 614         if (pcap_loop(pd, cnt, printer, pcap_userdata) < 0) {
 615                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
 616                     program_name, pcap_geterr(pd));
 617                 cleanup(0);
 618                 pcap_close(pd);
 619                 exit(1);
 620         }
 621         if (RFileName == NULL)
 622                 info(1);
 623         pcap_close(pd);
 624         exit(0);
 625 }
 626
 627 /* make a clean exit on interrupts */
 628 static RETSIGTYPE
 629 cleanup(int signo)
 630 {
 631
 632         /* Can't print the summary if reading from a savefile */
 633         if (pd != NULL && pcap_file(pd) == NULL) {
 634                 (void)fflush(stdout);
 635                 putc('\n', stderr);
 636                 info(1);
 637         }
 638         if (signo)
 639                 exit(0);
 640 }
 641
 642 void
 643 info(register int verbose)
 644 {
 645         struct pcap_stat stat;
 646
 647         if (pcap_stats(pd, &stat) < 0) {
 648                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
 649                 return;
 650         }
 651
 652         if (!verbose)
 653                 fprintf(stderr, "%s: ", program_name);
 654
 655         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
 656         if (!verbose)
 657                 fputs(", ", stderr);
 658         else
 659                 putc('\n', stderr);
 660         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
 661         infoprint = 0;
 662 }
 663
 664 static void
 665 reverse(char *s)
 666 {
 667         int i, j, c;
 668
 669         for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
 670                 c = s[i];
 671                 s[i] = s[j];
 672                 s[j] = c;
 673         }
 674 }
 675
 676
 677 static void
 678 swebitoa(unsigned int n, char *s)
 679 {
 680         unsigned int i;
 681
 682         i = 0;
 683         do {
 684                 s[i++] = n % 10 + '0';
 685         } while ((n /= 10) > 0);
 686
 687         s[i] = '\0';
 688         reverse(s);
 689 }
 690
 691 static void
 692 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 693 {
 694         struct dump_info *dump_info;
 695         static uint cnt = 2;
 696         char *name;
 697
 698         ++infodelay;
 699
 700         dump_info = (struct dump_info *)user;
 701
 702         /*
 703          * XXX - this won't prevent capture files from getting
 704          * larger than Cflag - the last packet written to the
 705          * file could put it over Cflag.
 706          */
 707         if (ftell((FILE *)dump_info->p) > Cflag) {
 708                 name = (char *) malloc(strlen(dump_info->WFileName) + 4);
 709                 if (name == NULL)
 710                         error("dump_packet_and_trunc: malloc");
 711                 strcpy(name, dump_info->WFileName);
 712                 swebitoa(cnt, name + strlen(dump_info->WFileName));
 713                 cnt++;
 714                 pcap_dump_close(dump_info->p);
 715                 dump_info->p = pcap_dump_open(dump_info->pd, name);
 716                 free(name);
 717                 if (dump_info->p == NULL)
 718                         error("%s", pcap_geterr(pd));
 719         }
 720
 721         pcap_dump((u_char *)dump_info->p, h, sp);
 722
 723         --infodelay;
 724         if (infoprint)
 725                 info(0);
 726 }
 727
 728 static void
 729 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
 730 {
 731         ++infodelay;
 732
 733         pcap_dump(user, h, sp);
 734
 735         --infodelay;
 736         if (infoprint)
 737                 info(0);
 738 }
 739
 740 /* Like default_print() but data need not be aligned */
 741 void
 742 default_print_unaligned(register const u_char *cp, register u_int length)
 743 {
 744         register u_int i, s;
 745         register int nshorts;
 746
 747         if (Xflag) {
 748                 ascii_print(cp, length);
 749                 return;
 750         }
 751         nshorts = (u_int) length / sizeof(u_short);
 752         i = 0;
 753         while (--nshorts >= 0) {
 754                 if ((i++ % 8) == 0)
 755                         (void)printf("\n\t\t\t");
 756                 s = *cp++;
 757                 (void)printf(" %02x%02x", s, *cp++);
 758         }
 759         if (length & 1) {
 760                 if ((i % 8) == 0)
 761                         (void)printf("\n\t\t\t");
 762                 (void)printf(" %02x", *cp);
 763         }
 764 }
 765
 766 #ifdef WIN32
 767         /*
 768          * XXX - there should really be libpcap calls to get the version
 769          * number as a string (the string would be generated from #defines
 770          * at run time, so that it's not generated from string constants
 771          * in the library, as, on many UNIX systems, those constants would
 772          * be statically linked into the application executable image, and
 773          * would thus reflect the version of libpcap on the system on
 774          * which the application was *linked*, not the system on which it's
 775          * *running*.
 776          *
 777          * That routine should be documented, unlike the "version[]"
 778          * string, so that UNIX vendors providing their own libpcaps
 779          * don't omit it (as a couple of vendors have...).
 780          *
 781          * Packet.dll should perhaps also export a routine to return the
 782          * version number of the Packet.dll code, to supply the
 783          * "Wpcap_version" information on Windows.
 784          */
 785         char WDversion[]="current-cvs.tcpdump.org";
 786         char version[]="current-cvs.tcpdump.org";
 787         char pcap_version[]="current-cvs.tcpdump.org";
 788         char Wpcap_version[]="3.0 alpha";
 789 #endif
 790
 791 /*
 792  * By default, print the packet out in hex.
 793  */
 794 void
 795 default_print(register const u_char *bp, register u_int length)
 796 {
 797         default_print_unaligned(bp, length);
 798 }
 799
 800 #ifdef SIGINFO
 801 RETSIGTYPE requestinfo(int signo _U_)
 802 {
 803         if (infodelay)
 804                 ++infoprint;
 805         else
 806                 info(0);
 807 }
 808 #endif
 809
 810 static void
 811 usage(void)
 812 {
 813         extern char version[];
 814 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
 815         extern char pcap_version[];
 816 #else
 817         static char pcap_version[] = "unknown";
 818 #endif
 819
 820 #ifdef WIN32
 821         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
 822         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
 823 #else
 824         (void)fprintf(stderr, "%s version %s\n", program_name, version);
 825         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
 826 #endif /* WIN32 */
 827         (void)fprintf(stderr,
 828 #ifdef WIN32
 829 "Usage: %s [-aAdDeflnNOpqRStuvxX] [-B size] [-c count] [ -C file_size ]\n", program_name);
 830 #else /* WIN32 */
 831 #ifdef HAVE_PCAP_FINDALLDEVS
 832 "Usage: %s [-aAdDeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name);
 833 #else /* HAVE_PCAP_FINDALLDEVS */
 834 "Usage: %s [-aAdeflnNOpqRStuvxX] [-c count] [ -C file_size ]\n", program_name);
 835 #endif /* HAVE_PCAP_FINDALLDEVS */
 836 #endif /* WIN32 */
 837         (void)fprintf(stderr,
 838 "\t\t[ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ]\n");
 839         (void)fprintf(stderr,
 840 "\t\t[ -T type ] [ -w file ] [ -E algo:secret ] [ expression ]\n");
 841         exit(1);
 842 }