contrib/tcpdump/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[] _U_ =
  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[] _U_ =
  33     "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.253.2.13 2007/09/12 19:48:51 guy Exp $ (LBL)";
  34 #endif
  35
  36 /* $FreeBSD$ */
  37
  38 /*
  39  * tcpdump - monitor tcp/ip traffic on an ethernet.
  40  *
  41  * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
  42  * Mercilessly hacked and occasionally improved since then via the
  43  * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
  44  */
  45
  46 #ifdef HAVE_CONFIG_H
  47 #include "config.h"
  48 #endif
  49
  50 #include <tcpdump-stdinc.h>
  51
  52 #ifdef WIN32
  53 #include "getopt.h"
  54 #include "w32_fzs.h"
  55 extern int strcasecmp (const char *__s1, const char *__s2);
  56 extern int SIZE_BUF;
  57 #define off_t long
  58 #define uint UINT
  59 #endif /* WIN32 */
  60
  61 #ifdef HAVE_SMI_H
  62 #include <smi.h>
  63 #endif
  64
  65 #include <pcap.h>
  66 #include <signal.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #ifndef WIN32
  71 #include <pwd.h>
  72 #include <grp.h>
  73 #include <errno.h>
  74 #endif /* WIN32 */
  75
  76 #include "netdissect.h"
  77 #include "interface.h"
  78 #include "addrtoname.h"
  79 #include "machdep.h"
  80 #include "setsignal.h"
  81 #include "gmt2local.h"
  82 #include "pcap-missing.h"
  83
  84 netdissect_options Gndo;
  85 netdissect_options *gndo = &Gndo;
  86
  87 /*
  88  * Define the maximum number of files for the -C flag, and how many
  89  * characters can be added to a filename for the -C flag (which
  90  * should be enough to handle MAX_CFLAG - 1).
  91  */
  92 #define MAX_CFLAG       1000000
  93 #define MAX_CFLAG_CHARS 6
  94
  95 int dflag;                      /* print filter code */
  96 int Lflag;                      /* list available data link types and exit */
  97
  98 static int infodelay;
  99 static int infoprint;
 100
 101 char *program_name;
 102
 103 int32_t thiszone;               /* seconds offset from gmt to local time */
 104
 105 /* Forwards */
 106 static RETSIGTYPE cleanup(int);
 107 static void usage(void) __attribute__((noreturn));
 108 static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
 109
 110 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 111 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
 112 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 113 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 114 static void droproot(const char *, const char *);
 115 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
 116 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
 117
 118 #ifdef SIGINFO
 119 RETSIGTYPE requestinfo(int);
 120 #endif
 121
 122 #if defined(USE_WIN32_MM_TIMER)
 123   #include <MMsystem.h>
 124   static UINT timer_id;
 125   static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
 126 #elif defined(HAVE_ALARM)
 127   static void verbose_stats_dump(int sig);
 128 #endif
 129
 130 static void info(int);
 131 static u_int packets_captured;
 132
 133 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
 134
 135 struct printer {
 136         if_printer f;
 137         int type;
 138 };
 139
 140 static struct printer printers[] = {
 141         { arcnet_if_print,      DLT_ARCNET },
 142 #ifdef DLT_ARCNET_LINUX
 143         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 144 #endif
 145         { ether_if_print,       DLT_EN10MB },
 146         { token_if_print,       DLT_IEEE802 },
 147 #ifdef DLT_LANE8023
 148         { lane_if_print,        DLT_LANE8023 },
 149 #endif
 150 #ifdef DLT_CIP
 151         { cip_if_print,         DLT_CIP },
 152 #endif
 153 #ifdef DLT_ATM_CLIP
 154         { cip_if_print,         DLT_ATM_CLIP },
 155 #endif
 156         { sl_if_print,          DLT_SLIP },
 157 #ifdef DLT_SLIP_BSDOS
 158         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 159 #endif
 160         { ppp_if_print,         DLT_PPP },
 161 #ifdef DLT_PPP_WITHDIRECTION
 162         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 163 #endif
 164 #ifdef DLT_PPP_BSDOS
 165         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 166 #endif
 167         { fddi_if_print,        DLT_FDDI },
 168         { null_if_print,        DLT_NULL },
 169 #ifdef DLT_LOOP
 170         { null_if_print,        DLT_LOOP },
 171 #endif
 172         { raw_if_print,         DLT_RAW },
 173         { atm_if_print,         DLT_ATM_RFC1483 },
 174 #ifdef DLT_C_HDLC
 175         { chdlc_if_print,       DLT_C_HDLC },
 176 #endif
 177 #ifdef DLT_HDLC
 178         { chdlc_if_print,       DLT_HDLC },
 179 #endif
 180 #ifdef DLT_PPP_SERIAL
 181         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 182 #endif
 183 #ifdef DLT_PPP_ETHER
 184         { pppoe_if_print,       DLT_PPP_ETHER },
 185 #endif
 186 #ifdef DLT_LINUX_SLL
 187         { sll_if_print,         DLT_LINUX_SLL },
 188 #endif
 189 #ifdef DLT_IEEE802_11
 190         { ieee802_11_if_print,  DLT_IEEE802_11},
 191 #endif
 192 #ifdef DLT_LTALK
 193         { ltalk_if_print,       DLT_LTALK },
 194 #endif
 195 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
 196         { pflog_if_print,       DLT_PFLOG },
 197 #endif
 198 #ifdef DLT_FR
 199         { fr_if_print,          DLT_FR },
 200 #endif
 201 #ifdef DLT_FRELAY
 202         { fr_if_print,          DLT_FRELAY },
 203 #endif
 204 #ifdef DLT_SUNATM
 205         { sunatm_if_print,      DLT_SUNATM },
 206 #endif
 207 #ifdef DLT_IP_OVER_FC
 208         { ipfc_if_print,        DLT_IP_OVER_FC },
 209 #endif
 210 #ifdef DLT_PRISM_HEADER
 211         { prism_if_print,       DLT_PRISM_HEADER },
 212 #endif
 213 #ifdef DLT_IEEE802_11_RADIO
 214         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 215 #endif
 216 #ifdef DLT_ENC
 217         { enc_if_print,         DLT_ENC },
 218 #endif
 219 #ifdef DLT_SYMANTEC_FIREWALL
 220         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 221 #endif
 222 #ifdef DLT_APPLE_IP_OVER_IEEE1394
 223         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
 224 #endif
 225 #ifdef DLT_JUNIPER_ATM1
 226         { juniper_atm1_print,   DLT_JUNIPER_ATM1 },
 227 #endif
 228 #ifdef DLT_JUNIPER_ATM2
 229         { juniper_atm2_print,   DLT_JUNIPER_ATM2 },
 230 #endif
 231 #ifdef DLT_JUNIPER_MFR
 232         { juniper_mfr_print,    DLT_JUNIPER_MFR },
 233 #endif
 234 #ifdef DLT_JUNIPER_MLFR
 235         { juniper_mlfr_print,   DLT_JUNIPER_MLFR },
 236 #endif
 237 #ifdef DLT_JUNIPER_MLPPP
 238         { juniper_mlppp_print,  DLT_JUNIPER_MLPPP },
 239 #endif
 240 #ifdef DLT_JUNIPER_PPPOE
 241         { juniper_pppoe_print,  DLT_JUNIPER_PPPOE },
 242 #endif
 243 #ifdef DLT_JUNIPER_PPPOE_ATM
 244         { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
 245 #endif
 246 #ifdef DLT_JUNIPER_GGSN
 247         { juniper_ggsn_print,   DLT_JUNIPER_GGSN },
 248 #endif
 249 #ifdef DLT_JUNIPER_ES
 250         { juniper_es_print,     DLT_JUNIPER_ES },
 251 #endif
 252 #ifdef DLT_JUNIPER_MONITOR
 253         { juniper_monitor_print, DLT_JUNIPER_MONITOR },
 254 #endif
 255 #ifdef DLT_JUNIPER_SERVICES
 256         { juniper_services_print, DLT_JUNIPER_SERVICES },
 257 #endif
 258 #ifdef DLT_JUNIPER_ETHER
 259         { juniper_ether_print, DLT_JUNIPER_ETHER },
 260 #endif
 261 #ifdef DLT_JUNIPER_PPP
 262         { juniper_ppp_print, DLT_JUNIPER_PPP },
 263 #endif
 264 #ifdef DLT_JUNIPER_FRELAY
 265         { juniper_frelay_print, DLT_JUNIPER_FRELAY },
 266 #endif
 267 #ifdef DLT_JUNIPER_CHDLC
 268         { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
 269 #endif
 270 #ifdef DLT_MFR
 271         { mfr_if_print, DLT_MFR },
 272 #endif
 273         { NULL,                 0 },
 274 };
 275
 276 static if_printer
 277 lookup_printer(int type)
 278 {
 279         struct printer *p;
 280
 281         for (p = printers; p->f; ++p)
 282                 if (type == p->type)
 283                         return p->f;
 284
 285         return NULL;
 286         /* NOTREACHED */
 287 }
 288
 289 static pcap_t *pd;
 290
 291 extern int optind;
 292 extern int opterr;
 293 extern char *optarg;
 294
 295 struct print_info {
 296         if_printer printer;
 297 };
 298
 299 struct dump_info {
 300         char    *WFileName;
 301         pcap_t  *pd;
 302         pcap_dumper_t *p;
 303 };
 304
 305 static void
 306 show_dlts_and_exit(pcap_t *pd)
 307 {
 308         int n_dlts;
 309         int *dlts = 0;
 310         const char *dlt_name;
 311
 312         n_dlts = pcap_list_datalinks(pd, &dlts);
 313         if (n_dlts < 0)
 314                 error("%s", pcap_geterr(pd));
 315         else if (n_dlts == 0 || !dlts)
 316                 error("No data link types.");
 317
 318         (void) fprintf(stderr, "Data link types (use option -y to set):\n");
 319
 320         while (--n_dlts >= 0) {
 321                 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
 322                 if (dlt_name != NULL) {
 323                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
 324                             pcap_datalink_val_to_description(dlts[n_dlts]));
 325
 326                         /*
 327                          * OK, does tcpdump handle that type?
 328                          */
 329                         if (lookup_printer(dlts[n_dlts]) == NULL)
 330                                 (void) fprintf(stderr, " (not supported)");
 331                         putchar('\n');
 332                 } else {
 333                         (void) fprintf(stderr, "  DLT %d (not supported)\n",
 334                             dlts[n_dlts]);
 335                 }
 336         }
 337         free(dlts);
 338         exit(0);
 339 }
 340
 341 /*
 342  * Set up flags that might or might not be supported depending on the
 343  * version of libpcap we're using.
 344  */
 345 #ifdef WIN32
 346 #define B_FLAG          "B:"
 347 #define B_FLAG_USAGE    " [ -B size ]"
 348 #else /* WIN32 */
 349 #define B_FLAG
 350 #define B_FLAG_USAGE
 351 #endif /* WIN32 */
 352
 353 #ifdef HAVE_PCAP_FINDALLDEVS
 354 #ifndef HAVE_PCAP_IF_T
 355 #undef HAVE_PCAP_FINDALLDEVS
 356 #endif
 357 #endif
 358
 359 #ifdef HAVE_PCAP_FINDALLDEVS
 360 #define D_FLAG  "D"
 361 #else
 362 #define D_FLAG
 363 #endif
 364
 365 #ifdef HAVE_PCAP_DUMP_FLUSH
 366 #define U_FLAG  "U"
 367 #else
 368 #define U_FLAG
 369 #endif
 370
 371 #ifndef WIN32
 372 /* Drop root privileges and chroot if necessary */
 373 static void
 374 droproot(const char *username, const char *chroot_dir)
 375 {
 376         struct passwd *pw = NULL;
 377
 378         if (chroot_dir && !username) {
 379                 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
 380                 exit(1);
 381         }
 382
 383         pw = getpwnam(username);
 384         if (pw) {
 385                 if (chroot_dir) {
 386                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
 387                                 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
 388                                     chroot_dir, pcap_strerror(errno));
 389                                 exit(1);
 390                         }
 391                 }
 392                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
 393                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
 394                         fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
 395                             username,
 396                             (unsigned long)pw->pw_uid,
 397                             (unsigned long)pw->pw_gid,
 398                             pcap_strerror(errno));
 399                         exit(1);
 400                 }
 401         }
 402         else {
 403                 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
 404                     username);
 405                 exit(1);
 406         }
 407 }
 408 #endif /* WIN32 */
 409
 410 static int
 411 getWflagChars(int x)
 412 {
 413         int c = 0;
 414
 415         x -= 1;
 416         while (x > 0) {
 417                 c += 1;
 418                 x /= 10;
 419         }
 420
 421         return c;
 422 }
 423
 424
 425 static void
 426 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
 427 {
 428         if (cnt == 0 && max_chars == 0)
 429                 strcpy(buffer, orig_name);
 430         else
 431                 sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
 432 }
 433
 434 static int tcpdump_printf(netdissect_options *ndo _U_,
 435                           const char *fmt, ...)
 436 {
 437
 438   va_list args;
 439   int ret;
 440
 441   va_start(args, fmt);
 442   ret=vfprintf(stdout, fmt, args);
 443   va_end(args);
 444
 445   return ret;
 446 }
 447
 448 int
 449 main(int argc, char **argv)
 450 {
 451         register int cnt, op, i;
 452         bpf_u_int32 localnet, netmask;
 453         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
 454         pcap_handler callback;
 455         int type;
 456         struct bpf_program fcode;
 457 #ifndef WIN32
 458         RETSIGTYPE (*oldhandler)(int);
 459 #endif
 460         struct print_info printinfo;
 461         struct dump_info dumpinfo;
 462         u_char *pcap_userdata;
 463         char ebuf[PCAP_ERRBUF_SIZE];
 464         char *username = NULL;
 465         char *chroot_dir = NULL;
 466 #ifdef HAVE_PCAP_FINDALLDEVS
 467         pcap_if_t *devpointer;
 468         int devnum;
 469 #endif
 470         int status;
 471 #ifdef WIN32
 472         u_int UserBufferSize = 1000000;
 473         if(wsockinit() != 0) return 1;
 474 #endif /* WIN32 */
 475
 476         gndo->ndo_Oflag=1;
 477         gndo->ndo_Rflag=1;
 478         gndo->ndo_dlt=-1;
 479         gndo->ndo_default_print=ndo_default_print;
 480         gndo->ndo_printf=tcpdump_printf;
 481         gndo->ndo_error=ndo_error;
 482         gndo->ndo_warning=ndo_warning;
 483         gndo->ndo_snaplen = DEFAULT_SNAPLEN;
 484
 485         cnt = -1;
 486         device = NULL;
 487         infile = NULL;
 488         RFileName = NULL;
 489         WFileName = NULL;
 490         if ((cp = strrchr(argv[0], '/')) != NULL)
 491                 program_name = cp + 1;
 492         else
 493                 program_name = argv[0];
 494
 495         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 496                 error("%s", ebuf);
 497
 498 #ifdef LIBSMI
 499         smiInit("tcpdump");
 500 #endif
 501
 502         opterr = 0;
 503         while (
 504             (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:i:lLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:YZ:")) != -1)
 505                 switch (op) {
 506
 507                 case 'a':
 508                         /* compatibility for old -a */
 509                         break;
 510
 511                 case 'A':
 512                         ++Aflag;
 513                         break;
 514
 515 #ifdef WIN32
 516                 case 'B':
 517                         UserBufferSize = atoi(optarg)*1024;
 518                         if (UserBufferSize < 0)
 519                                 error("invalid packet buffer size %s", optarg);
 520                         break;
 521 #endif /* WIN32 */
 522
 523                 case 'c':
 524                         cnt = atoi(optarg);
 525                         if (cnt <= 0)
 526                                 error("invalid packet count %s", optarg);
 527                         break;
 528
 529                 case 'C':
 530                         Cflag = atoi(optarg) * 1000000;
 531                         if (Cflag < 0)
 532                                 error("invalid file size %s", optarg);
 533                         break;
 534
 535                 case 'd':
 536                         ++dflag;
 537                         break;
 538
 539 #ifdef HAVE_PCAP_FINDALLDEVS
 540                 case 'D':
 541                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 542                                 error("%s", ebuf);
 543                         else {
 544                                 for (i = 0; devpointer != 0; i++) {
 545                                         printf("%d.%s", i+1, devpointer->name);
 546                                         if (devpointer->description != NULL)
 547                                                 printf(" (%s)", devpointer->description);
 548                                         printf("\n");
 549                                         devpointer = devpointer->next;
 550                                 }
 551                         }
 552                         return 0;
 553 #endif /* HAVE_PCAP_FINDALLDEVS */
 554
 555                 case 'L':
 556                         Lflag++;
 557                         break;
 558
 559                 case 'e':
 560                         ++eflag;
 561                         break;
 562
 563                 case 'E':
 564 #ifndef HAVE_LIBCRYPTO
 565                         warning("crypto code not compiled in");
 566 #endif
 567                         gndo->ndo_espsecret = optarg;
 568                         break;
 569
 570                 case 'f':
 571                         ++fflag;
 572                         break;
 573
 574                 case 'F':
 575                         infile = optarg;
 576                         break;
 577
 578                 case 'i':
 579                         if (optarg[0] == '0' && optarg[1] == 0)
 580                                 error("Invalid adapter index");
 581
 582 #ifdef HAVE_PCAP_FINDALLDEVS
 583                         /*
 584                          * If the argument is a number, treat it as
 585                          * an index into the list of adapters, as
 586                          * printed by "tcpdump -D".
 587                          *
 588                          * This should be OK on UNIX systems, as interfaces
 589                          * shouldn't have names that begin with digits.
 590                          * It can be useful on Windows, where more than
 591                          * one interface can have the same name.
 592                          */
 593                         if ((devnum = atoi(optarg)) != 0) {
 594                                 if (devnum < 0)
 595                                         error("Invalid adapter index");
 596
 597                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 598                                         error("%s", ebuf);
 599                                 else {
 600                                         for (i = 0; i < devnum-1; i++){
 601                                                 devpointer = devpointer->next;
 602                                                 if (devpointer == NULL)
 603                                                         error("Invalid adapter index");
 604                                         }
 605                                 }
 606                                 device = devpointer->name;
 607                                 break;
 608                         }
 609 #endif /* HAVE_PCAP_FINDALLDEVS */
 610                         device = optarg;
 611                         break;
 612
 613                 case 'l':
 614 #ifdef WIN32
 615                         /*
 616                          * _IOLBF is the same as _IOFBF in Microsoft's C
 617                          * libraries; the only alternative they offer
 618                          * is _IONBF.
 619                          *
 620                          * XXX - this should really be checking for MSVC++,
 621                          * not WIN32, if, for example, MinGW has its own
 622                          * C library that is more UNIX-compatible.
 623                          */
 624                         setvbuf(stdout, NULL, _IONBF, 0);
 625 #else /* WIN32 */
 626 #ifdef HAVE_SETLINEBUF
 627                         setlinebuf(stdout);
 628 #else
 629                         setvbuf(stdout, NULL, _IOLBF, 0);
 630 #endif
 631 #endif /* WIN32 */
 632                         break;
 633
 634                 case 'n':
 635                         ++nflag;
 636                         break;
 637
 638                 case 'N':
 639                         ++Nflag;
 640                         break;
 641
 642                 case 'm':
 643 #ifdef LIBSMI
 644                         if (smiLoadModule(optarg) == 0) {
 645                                 error("could not load MIB module %s", optarg);
 646                         }
 647                         sflag = 1;
 648 #else
 649                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 650                                       program_name, optarg);
 651                         (void)fprintf(stderr, "(no libsmi support)\n");
 652 #endif
 653                         break;
 654
 655                 case 'M':
 656                         /* TCP-MD5 shared secret */
 657 #ifndef HAVE_LIBCRYPTO
 658                         warning("crypto code not compiled in");
 659 #endif
 660                         tcpmd5secret = optarg;
 661                         break;
 662
 663                 case 'O':
 664                         Oflag = 0;
 665                         break;
 666
 667                 case 'p':
 668                         ++pflag;
 669                         break;
 670
 671                 case 'q':
 672                         ++qflag;
 673                         ++suppress_default_print;
 674                         break;
 675
 676                 case 'r':
 677                         RFileName = optarg;
 678                         break;
 679
 680                 case 'R':
 681                         Rflag = 0;
 682                         break;
 683
 684                 case 's': {
 685                         char *end;
 686
 687                         snaplen = strtol(optarg, &end, 0);
 688                         if (optarg == end || *end != '\0'
 689                             || snaplen < 0 || snaplen > 65535)
 690                                 error("invalid snaplen %s", optarg);
 691                         else if (snaplen == 0)
 692                                 snaplen = 65535;
 693                         break;
 694                 }
 695
 696                 case 'S':
 697                         ++Sflag;
 698                         break;
 699
 700                 case 't':
 701                         ++tflag;
 702                         break;
 703
 704                 case 'T':
 705                         if (strcasecmp(optarg, "vat") == 0)
 706                                 packettype = PT_VAT;
 707                         else if (strcasecmp(optarg, "wb") == 0)
 708                                 packettype = PT_WB;
 709                         else if (strcasecmp(optarg, "rpc") == 0)
 710                                 packettype = PT_RPC;
 711                         else if (strcasecmp(optarg, "rtp") == 0)
 712                                 packettype = PT_RTP;
 713                         else if (strcasecmp(optarg, "rtcp") == 0)
 714                                 packettype = PT_RTCP;
 715                         else if (strcasecmp(optarg, "snmp") == 0)
 716                                 packettype = PT_SNMP;
 717                         else if (strcasecmp(optarg, "cnfp") == 0)
 718                                 packettype = PT_CNFP;
 719                         else if (strcasecmp(optarg, "tftp") == 0)
 720                                 packettype = PT_TFTP;
 721                         else if (strcasecmp(optarg, "aodv") == 0)
 722                                 packettype = PT_AODV;
 723                         else
 724                                 error("unknown packet type `%s'", optarg);
 725                         break;
 726
 727                 case 'u':
 728                         ++uflag;
 729                         break;
 730
 731 #ifdef HAVE_PCAP_DUMP_FLUSH
 732                 case 'U':
 733                         ++Uflag;
 734                         break;
 735 #endif
 736
 737                 case 'v':
 738                         ++vflag;
 739                         break;
 740
 741                 case 'w':
 742                         WFileName = optarg;
 743                         break;
 744
 745                 case 'W':
 746                         Wflag = atoi(optarg);
 747                         if (Wflag < 0)
 748                                 error("invalid number of output files %s", optarg);
 749                         WflagChars = getWflagChars(Wflag);
 750                         break;
 751
 752                 case 'x':
 753                         ++xflag;
 754                         ++suppress_default_print;
 755                         break;
 756
 757                 case 'X':
 758                         ++Xflag;
 759                         ++suppress_default_print;
 760                         break;
 761
 762                 case 'y':
 763                         gndo->ndo_dltname = optarg;
 764                         gndo->ndo_dlt =
 765                           pcap_datalink_name_to_val(gndo->ndo_dltname);
 766                         if (gndo->ndo_dlt < 0)
 767                                 error("invalid data link type %s", gndo->ndo_dltname);
 768                         break;
 769
 770 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 771                 case 'Y':
 772                         {
 773                         /* Undocumented flag */
 774 #ifdef HAVE_PCAP_DEBUG
 775                         extern int pcap_debug;
 776                         pcap_debug = 1;
 777 #else
 778                         extern int yydebug;
 779                         yydebug = 1;
 780 #endif
 781                         }
 782                         break;
 783 #endif
 784                 case 'Z':
 785                         if (optarg) {
 786                                 username = strdup(optarg);
 787                         }
 788                         else {
 789                                 usage();
 790                                 /* NOTREACHED */
 791                         }
 792                         break;
 793
 794                 default:
 795                         usage();
 796                         /* NOTREACHED */
 797                 }
 798
 799         switch (tflag) {
 800
 801         case 0: /* Default */
 802         case 4: /* Default + Date*/
 803                 thiszone = gmt2local(0);
 804                 break;
 805
 806         case 1: /* No time stamp */
 807         case 2: /* Unix timeval style */
 808         case 3: /* Microseconds since previous packet */
 809                 break;
 810
 811         default: /* Not supported */
 812                 error("only -t, -tt, -ttt, and -tttt are supported");
 813                 break;
 814         }
 815
 816 #ifdef WITH_CHROOT
 817         /* if run as root, prepare for chrooting */
 818         if (getuid() == 0 || geteuid() == 0) {
 819                 /* future extensibility for cmd-line arguments */
 820                 if (!chroot_dir)
 821                         chroot_dir = WITH_CHROOT;
 822         }
 823 #endif
 824
 825 #ifdef WITH_USER
 826         /* if run as root, prepare for dropping root privileges */
 827         if (getuid() == 0 || geteuid() == 0) {
 828                 /* Run with '-Z root' to restore old behaviour */
 829                 if (!username)
 830                         username = WITH_USER;
 831         }
 832 #endif
 833
 834         if (RFileName != NULL) {
 835                 int dlt;
 836                 const char *dlt_name;
 837
 838 #ifndef WIN32
 839                 /*
 840                  * We don't need network access, so relinquish any set-UID
 841                  * or set-GID privileges we have (if any).
 842                  *
 843                  * We do *not* want set-UID privileges when opening a
 844                  * trace file, as that might let the user read other
 845                  * people's trace files (especially if we're set-UID
 846                  * root).
 847                  */
 848                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
 849                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 850 #endif /* WIN32 */
 851                 pd = pcap_open_offline(RFileName, ebuf);
 852                 if (pd == NULL)
 853                         error("%s", ebuf);
 854                 dlt = pcap_datalink(pd);
 855                 dlt_name = pcap_datalink_val_to_name(dlt);
 856                 if (dlt_name == NULL) {
 857                         fprintf(stderr, "reading from file %s, link-type %u\n",
 858                             RFileName, dlt);
 859                 } else {
 860                         fprintf(stderr,
 861                             "reading from file %s, link-type %s (%s)\n",
 862                             RFileName, dlt_name,
 863                             pcap_datalink_val_to_description(dlt));
 864                 }
 865                 localnet = 0;
 866                 netmask = 0;
 867                 if (fflag != 0)
 868                         error("-f and -r options are incompatible");
 869         } else {
 870                 if (device == NULL) {
 871                         device = pcap_lookupdev(ebuf);
 872                         if (device == NULL)
 873                                 error("%s", ebuf);
 874                 }
 875 #ifdef WIN32
 876                 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
 877                 {                                               //a Unicode string has a \0 as second byte (so strlen() is 1)
 878                         fprintf(stderr, "%s: listening on %ws\n", program_name, device);
 879                 }
 880                 else
 881                 {
 882                         fprintf(stderr, "%s: listening on %s\n", program_name, device);
 883                 }
 884
 885                 fflush(stderr);
 886 #endif /* WIN32 */
 887                 *ebuf = '\0';
 888                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
 889                 if (pd == NULL)
 890                         error("%s", ebuf);
 891                 else if (*ebuf)
 892                         warning("%s", ebuf);
 893                 /*
 894                  * Let user own process after socket has been opened.
 895                  */
 896 #ifndef WIN32
 897                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
 898                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 899 #endif /* WIN32 */
 900 #ifdef WIN32
 901                 if(UserBufferSize != 1000000)
 902                         if(pcap_setbuff(pd, UserBufferSize)==-1){
 903                                 error("%s", pcap_geterr(pd));
 904                         }
 905 #endif /* WIN32 */
 906                 if (Lflag)
 907                         show_dlts_and_exit(pd);
 908                 if (gndo->ndo_dlt >= 0) {
 909 #ifdef HAVE_PCAP_SET_DATALINK
 910                         if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
 911                                 error("%s", pcap_geterr(pd));
 912 #else
 913                         /*
 914                          * We don't actually support changing the
 915                          * data link type, so we only let them
 916                          * set it to what it already is.
 917                          */
 918                         if (gndo->ndo_dlt != pcap_datalink(pd)) {
 919                                 error("%s is not one of the DLTs supported by this device\n",
 920                                       gndo->ndo_dltname);
 921                         }
 922 #endif
 923                         (void)fprintf(stderr, "%s: data link type %s\n",
 924                                       program_name, gndo->ndo_dltname);
 925                         (void)fflush(stderr);
 926                 }
 927                 i = pcap_snapshot(pd);
 928                 if (snaplen < i) {
 929                         warning("snaplen raised from %d to %d", snaplen, i);
 930                         snaplen = i;
 931                 }
 932                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 933                         localnet = 0;
 934                         netmask = 0;
 935                         warning("%s", ebuf);
 936                 }
 937         }
 938         if (infile)
 939                 cmdbuf = read_infile(infile);
 940         else
 941                 cmdbuf = copy_argv(&argv[optind]);
 942
 943         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 944                 error("%s", pcap_geterr(pd));
 945         if (dflag) {
 946                 bpf_dump(&fcode, dflag);
 947                 pcap_close(pd);
 948                 exit(0);
 949         }
 950         init_addrtoname(localnet, netmask);
 951
 952 #ifndef WIN32
 953         (void)setsignal(SIGPIPE, cleanup);
 954 #endif /* WIN32 */
 955         (void)setsignal(SIGTERM, cleanup);
 956         (void)setsignal(SIGINT, cleanup);
 957         /* Cooperate with nohup(1) */
 958 #ifndef WIN32
 959         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
 960                 (void)setsignal(SIGHUP, oldhandler);
 961 #endif /* WIN32 */
 962
 963         if (pcap_setfilter(pd, &fcode) < 0)
 964                 error("%s", pcap_geterr(pd));
 965         if (WFileName) {
 966                 pcap_dumper_t *p;
 967
 968                 WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1);
 969                 if (WFileNameAlt == NULL)
 970                         error("malloc of WFileNameAlt");
 971                 MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
 972                 p = pcap_dump_open(pd, WFileNameAlt);
 973                 if (p == NULL)
 974                         error("%s", pcap_geterr(pd));
 975                 if (Cflag != 0) {
 976                         callback = dump_packet_and_trunc;
 977                         dumpinfo.WFileName = WFileName;
 978                         dumpinfo.pd = pd;
 979                         dumpinfo.p = p;
 980                         pcap_userdata = (u_char *)&dumpinfo;
 981                 } else {
 982                         callback = dump_packet;
 983                         pcap_userdata = (u_char *)p;
 984                 }
 985         } else {
 986                 type = pcap_datalink(pd);
 987                 printinfo.printer = lookup_printer(type);
 988                 if (printinfo.printer == NULL) {
 989                         gndo->ndo_dltname = pcap_datalink_val_to_name(type);
 990                         if (gndo->ndo_dltname != NULL)
 991                                 error("unsupported data link type %s",
 992                                       gndo->ndo_dltname);
 993                         else
 994                                 error("unsupported data link type %d", type);
 995                 }
 996                 callback = print_packet;
 997                 pcap_userdata = (u_char *)&printinfo;
 998         }
 999 #ifndef WIN32
1000         /*
1001          * We cannot do this earlier, because we want to be able to open
1002          * the file (if done) for writing before giving up permissions.
1003          */
1004         if (getuid() == 0 || geteuid() == 0) {
1005                 if (username || chroot_dir)
1006                         droproot(username, chroot_dir);
1007         }
1008 #endif /* WIN32 */
1009 #ifdef SIGINFO
1010         (void)setsignal(SIGINFO, requestinfo);
1011 #endif
1012
1013         if (vflag > 0 && WFileName) {
1014                 /*
1015                  * When capturing to a file, "-v" means tcpdump should,
1016                  * every 10 secodns, "v"erbosely report the number of
1017                  * packets captured.
1018                  */
1019 #ifdef USE_WIN32_MM_TIMER
1020                 /* call verbose_stats_dump() each 1000 +/-100msec */
1021                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1022                 setvbuf(stderr, NULL, _IONBF, 0);
1023 #elif defined(HAVE_ALARM)
1024                 (void)setsignal(SIGALRM, verbose_stats_dump);
1025                 alarm(1);
1026 #endif
1027         }
1028
1029 #ifndef WIN32
1030         if (RFileName == NULL) {
1031                 int dlt;
1032                 const char *dlt_name;
1033
1034                 if (!vflag && !WFileName) {
1035                         (void)fprintf(stderr,
1036                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1037                             program_name);
1038                 } else
1039                         (void)fprintf(stderr, "%s: ", program_name);
1040                 dlt = pcap_datalink(pd);
1041                 dlt_name = pcap_datalink_val_to_name(dlt);
1042                 if (dlt_name == NULL) {
1043                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1044                             device, dlt, snaplen);
1045                 } else {
1046                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1047                             device, dlt_name,
1048                             pcap_datalink_val_to_description(dlt), snaplen);
1049                 }
1050                 (void)fflush(stderr);
1051         }
1052 #endif /* WIN32 */
1053         status = pcap_loop(pd, cnt, callback, pcap_userdata);
1054         if (WFileName == NULL) {
1055                 /*
1056                  * We're printing packets.  Flush the printed output,
1057                  * so it doesn't get intermingled with error output.
1058                  */
1059                 if (status == -2) {
1060                         /*
1061                          * We got interrupted, so perhaps we didn't
1062                          * manage to finish a line we were printing.
1063                          * Print an extra newline, just in case.
1064                          */
1065                         putchar('\n');
1066                 }
1067                 (void)fflush(stdout);
1068         }
1069         if (status == -1) {
1070                 /*
1071                  * Error.  Report it.
1072                  */
1073                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1074                     program_name, pcap_geterr(pd));
1075         }
1076         if (RFileName == NULL) {
1077                 /*
1078                  * We're doing a live capture.  Report the capture
1079                  * statistics.
1080                  */
1081                 info(1);
1082         }
1083         pcap_close(pd);
1084         exit(status == -1 ? 1 : 0);
1085 }
1086
1087 /* make a clean exit on interrupts */
1088 static RETSIGTYPE
1089 cleanup(int signo _U_)
1090 {
1091 #ifdef USE_WIN32_MM_TIMER
1092         if (timer_id)
1093                 timeKillEvent(timer_id);
1094         timer_id = 0;
1095 #elif defined(HAVE_ALARM)
1096         alarm(0);
1097 #endif
1098
1099 #ifdef HAVE_PCAP_BREAKLOOP
1100         /*
1101          * We have "pcap_breakloop()"; use it, so that we do as little
1102          * as possible in the signal handler (it's probably not safe
1103          * to do anything with standard I/O streams in a signal handler -
1104          * the ANSI C standard doesn't say it is).
1105          */
1106         pcap_breakloop(pd);
1107 #else
1108         /*
1109          * We don't have "pcap_breakloop()"; this isn't safe, but
1110          * it's the best we can do.  Print the summary if we're
1111          * not reading from a savefile - i.e., if we're doing a
1112          * live capture - and exit.
1113          */
1114         if (pd != NULL && pcap_file(pd) == NULL) {
1115                 /*
1116                  * We got interrupted, so perhaps we didn't
1117                  * manage to finish a line we were printing.
1118                  * Print an extra newline, just in case.
1119                  */
1120                 putchar('\n');
1121                 (void)fflush(stdout);
1122                 info(1);
1123         }
1124         exit(0);
1125 #endif
1126 }
1127
1128 static void
1129 info(register int verbose)
1130 {
1131         struct pcap_stat stat;
1132
1133         if (pcap_stats(pd, &stat) < 0) {
1134                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1135                 infoprint = 0;
1136                 return;
1137         }
1138
1139         if (!verbose)
1140                 fprintf(stderr, "%s: ", program_name);
1141
1142         (void)fprintf(stderr, "%u packets captured", packets_captured);
1143         if (!verbose)
1144                 fputs(", ", stderr);
1145         else
1146                 putc('\n', stderr);
1147         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1148         if (!verbose)
1149                 fputs(", ", stderr);
1150         else
1151                 putc('\n', stderr);
1152         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1153         infoprint = 0;
1154 }
1155
1156 static void
1157 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1158 {
1159         struct dump_info *dump_info;
1160         char *name;
1161
1162         ++packets_captured;
1163
1164         ++infodelay;
1165
1166         dump_info = (struct dump_info *)user;
1167
1168         /*
1169          * XXX - this won't prevent capture files from getting
1170          * larger than Cflag - the last packet written to the
1171          * file could put it over Cflag.
1172          */
1173         if (pcap_dump_ftell(dump_info->p) > Cflag) {
1174                 /*
1175                  * Close the current file and open a new one.
1176                  */
1177                 pcap_dump_close(dump_info->p);
1178                 Cflag_count++;
1179                 if (Wflag > 0) {
1180                         if (Cflag_count >= Wflag)
1181                                 Cflag_count = 0;
1182                 } else {
1183                         if (Cflag_count >= MAX_CFLAG)
1184                                 error("too many output files");
1185                 }
1186                 name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1);
1187                 if (name == NULL)
1188                         error("dump_packet_and_trunc: malloc");
1189                 MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
1190                 dump_info->p = pcap_dump_open(dump_info->pd, name);
1191                 free(name);
1192                 if (dump_info->p == NULL)
1193                         error("%s", pcap_geterr(pd));
1194         }
1195
1196         pcap_dump((u_char *)dump_info->p, h, sp);
1197 #ifdef HAVE_PCAP_DUMP_FLUSH
1198         if (Uflag)
1199                 pcap_dump_flush(dump_info->p);
1200 #endif
1201
1202         --infodelay;
1203         if (infoprint)
1204                 info(0);
1205 }
1206
1207 static void
1208 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1209 {
1210         ++packets_captured;
1211
1212         ++infodelay;
1213
1214         pcap_dump(user, h, sp);
1215 #ifdef HAVE_PCAP_DUMP_FLUSH
1216         if (Uflag)
1217                 pcap_dump_flush((pcap_dumper_t *)user);
1218 #endif
1219
1220         --infodelay;
1221         if (infoprint)
1222                 info(0);
1223 }
1224
1225 static void
1226 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1227 {
1228         struct print_info *print_info;
1229         u_int hdrlen;
1230
1231         ++packets_captured;
1232
1233         ++infodelay;
1234         ts_print(&h->ts);
1235
1236         print_info = (struct print_info *)user;
1237
1238         /*
1239          * Some printers want to check that they're not walking off the
1240          * end of the packet.
1241          * Rather than pass it all the way down, we set this global.
1242          */
1243         snapend = sp + h->caplen;
1244
1245         hdrlen = (*print_info->printer)(h, sp);
1246         if (Xflag) {
1247                 /*
1248                  * Print the raw packet data in hex and ASCII.
1249                  */
1250                 if (Xflag > 1) {
1251                         /*
1252                          * Include the link-layer header.
1253                          */
1254                         hex_and_ascii_print("\n\t", sp, h->caplen);
1255                 } else {
1256                         /*
1257                          * Don't include the link-layer header - and if
1258                          * we have nothing past the link-layer header,
1259                          * print nothing.
1260                          */
1261                         if (h->caplen > hdrlen)
1262                                 hex_and_ascii_print("\n\t", sp + hdrlen,
1263                                     h->caplen - hdrlen);
1264                 }
1265         } else if (xflag) {
1266                 /*
1267                  * Print the raw packet data in hex.
1268                  */
1269                 if (xflag > 1) {
1270                         /*
1271                          * Include the link-layer header.
1272                          */
1273                         hex_print("\n\t", sp, h->caplen);
1274                 } else {
1275                         /*
1276                          * Don't include the link-layer header - and if
1277                          * we have nothing past the link-layer header,
1278                          * print nothing.
1279                          */
1280                         if (h->caplen > hdrlen)
1281                                 hex_print("\n\t", sp + hdrlen,
1282                                     h->caplen - hdrlen);
1283                 }
1284         } else if (Aflag) {
1285                 /*
1286                  * Print the raw packet data in ASCII.
1287                  */
1288                 if (Aflag > 1) {
1289                         /*
1290                          * Include the link-layer header.
1291                          */
1292                         ascii_print(sp, h->caplen);
1293                 } else {
1294                         /*
1295                          * Don't include the link-layer header - and if
1296                          * we have nothing past the link-layer header,
1297                          * print nothing.
1298                          */
1299                         if (h->caplen > hdrlen)
1300                                 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1301                 }
1302         }
1303
1304         putchar('\n');
1305
1306         --infodelay;
1307         if (infoprint)
1308                 info(0);
1309 }
1310
1311 #ifdef WIN32
1312         /*
1313          * XXX - there should really be libpcap calls to get the version
1314          * number as a string (the string would be generated from #defines
1315          * at run time, so that it's not generated from string constants
1316          * in the library, as, on many UNIX systems, those constants would
1317          * be statically linked into the application executable image, and
1318          * would thus reflect the version of libpcap on the system on
1319          * which the application was *linked*, not the system on which it's
1320          * *running*.
1321          *
1322          * That routine should be documented, unlike the "version[]"
1323          * string, so that UNIX vendors providing their own libpcaps
1324          * don't omit it (as a couple of vendors have...).
1325          *
1326          * Packet.dll should perhaps also export a routine to return the
1327          * version number of the Packet.dll code, to supply the
1328          * "Wpcap_version" information on Windows.
1329          */
1330         char WDversion[]="current-cvs.tcpdump.org";
1331 #if !defined(HAVE_GENERATED_VERSION)
1332         char version[]="current-cvs.tcpdump.org";
1333 #endif
1334         char pcap_version[]="current-cvs.tcpdump.org";
1335         char Wpcap_version[]="3.1";
1336 #endif
1337
1338 /*
1339  * By default, print the specified data out in hex and ASCII.
1340  */
1341 static void
1342 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1343 {
1344         hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1345 }
1346
1347 void
1348 default_print(const u_char *bp, u_int length)
1349 {
1350         ndo_default_print(gndo, bp, length);
1351 }
1352
1353 #ifdef SIGINFO
1354 RETSIGTYPE requestinfo(int signo _U_)
1355 {
1356         if (infodelay)
1357                 ++infoprint;
1358         else
1359                 info(0);
1360 }
1361 #endif
1362
1363 /*
1364  * Called once each second in verbose mode while dumping to file
1365  */
1366 #ifdef USE_WIN32_MM_TIMER
1367 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1368                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1369 {
1370         struct pcap_stat stat;
1371
1372         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1373                 fprintf(stderr, "Got %u\r", packets_captured);
1374 }
1375 #elif defined(HAVE_ALARM)
1376 static void verbose_stats_dump(int sig _U_)
1377 {
1378         struct pcap_stat stat;
1379
1380         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1381                 fprintf(stderr, "Got %u\r", packets_captured);
1382         alarm(1);
1383 }
1384 #endif
1385
1386 static void
1387 usage(void)
1388 {
1389         extern char version[];
1390 #ifndef HAVE_PCAP_LIB_VERSION
1391 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1392         extern char pcap_version[];
1393 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1394         static char pcap_version[] = "unknown";
1395 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1396 #endif /* HAVE_PCAP_LIB_VERSION */
1397
1398 #ifdef HAVE_PCAP_LIB_VERSION
1399 #ifdef WIN32
1400         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1401 #else /* WIN32 */
1402         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1403 #endif /* WIN32 */
1404         (void)fprintf(stderr, "%s\n",pcap_lib_version());
1405 #else /* HAVE_PCAP_LIB_VERSION */
1406 #ifdef WIN32
1407         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1408         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1409 #else /* WIN32 */
1410         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1411         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1412 #endif /* WIN32 */
1413 #endif /* HAVE_PCAP_LIB_VERSION */
1414         (void)fprintf(stderr,
1415 "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
1416         (void)fprintf(stderr,
1417 "\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -M secret ]\n");
1418         (void)fprintf(stderr,
1419 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1420         (void)fprintf(stderr,
1421 "\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
1422         (void)fprintf(stderr,
1423 "\t\t[ expression ]\n");
1424         exit(1);
1425 }
1426
1427
1428
1429 /* VARARGS */
1430 static void
1431 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1432 {
1433         va_list ap;
1434
1435         (void)fprintf(stderr, "%s: ", program_name);
1436         va_start(ap, fmt);
1437         (void)vfprintf(stderr, fmt, ap);
1438         va_end(ap);
1439         if (*fmt) {
1440                 fmt += strlen(fmt);
1441                 if (fmt[-1] != '\n')
1442                         (void)fputc('\n', stderr);
1443         }
1444         exit(1);
1445         /* NOTREACHED */
1446 }
1447
1448 /* VARARGS */
1449 static void
1450 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1451 {
1452         va_list ap;
1453
1454         (void)fprintf(stderr, "%s: WARNING: ", program_name);
1455         va_start(ap, fmt);
1456         (void)vfprintf(stderr, fmt, ap);
1457         va_end(ap);
1458         if (*fmt) {
1459                 fmt += strlen(fmt);
1460                 if (fmt[-1] != '\n')
1461                         (void)fputc('\n', stderr);
1462         }
1463 }
1464