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 1.253.2.11 2005/08/23 10:29:41 hannes 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 #ifdef DLT_PFLOG
 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         { NULL,                 0 },
 271 };
 272
 273 static if_printer
 274 lookup_printer(int type)
 275 {
 276         struct printer *p;
 277
 278         for (p = printers; p->f; ++p)
 279                 if (type == p->type)
 280                         return p->f;
 281
 282         return NULL;
 283         /* NOTREACHED */
 284 }
 285
 286 static pcap_t *pd;
 287
 288 extern int optind;
 289 extern int opterr;
 290 extern char *optarg;
 291
 292 struct print_info {
 293         if_printer printer;
 294 };
 295
 296 struct dump_info {
 297         char    *WFileName;
 298         pcap_t  *pd;
 299         pcap_dumper_t *p;
 300 };
 301
 302 static void
 303 show_dlts_and_exit(pcap_t *pd)
 304 {
 305         int n_dlts;
 306         int *dlts = 0;
 307         const char *dlt_name;
 308
 309         n_dlts = pcap_list_datalinks(pd, &dlts);
 310         if (n_dlts < 0)
 311                 error("%s", pcap_geterr(pd));
 312         else if (n_dlts == 0 || !dlts)
 313                 error("No data link types.");
 314
 315         (void) fprintf(stderr, "Data link types (use option -y to set):\n");
 316
 317         while (--n_dlts >= 0) {
 318                 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
 319                 if (dlt_name != NULL) {
 320                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
 321                             pcap_datalink_val_to_description(dlts[n_dlts]));
 322
 323                         /*
 324                          * OK, does tcpdump handle that type?
 325                          */
 326                         if (lookup_printer(dlts[n_dlts]) == NULL)
 327                                 (void) fprintf(stderr, " (not supported)");
 328                         putchar('\n');
 329                 } else {
 330                         (void) fprintf(stderr, "  DLT %d (not supported)\n",
 331                             dlts[n_dlts]);
 332                 }
 333         }
 334         free(dlts);
 335         exit(0);
 336 }
 337
 338 /*
 339  * Set up flags that might or might not be supported depending on the
 340  * version of libpcap we're using.
 341  */
 342 #ifdef WIN32
 343 #define B_FLAG          "B:"
 344 #define B_FLAG_USAGE    " [ -B size ]"
 345 #else /* WIN32 */
 346 #define B_FLAG
 347 #define B_FLAG_USAGE
 348 #endif /* WIN32 */
 349
 350 #ifdef HAVE_PCAP_FINDALLDEVS
 351 #ifndef HAVE_PCAP_IF_T
 352 #undef HAVE_PCAP_FINDALLDEVS
 353 #endif
 354 #endif
 355
 356 #ifdef HAVE_PCAP_FINDALLDEVS
 357 #define D_FLAG  "D"
 358 #else
 359 #define D_FLAG
 360 #endif
 361
 362 #ifdef HAVE_PCAP_DUMP_FLUSH
 363 #define U_FLAG  "U"
 364 #else
 365 #define U_FLAG
 366 #endif
 367
 368 #ifndef WIN32
 369 /* Drop root privileges and chroot if necessary */
 370 static void
 371 droproot(const char *username, const char *chroot_dir)
 372 {
 373         struct passwd *pw = NULL;
 374
 375         if (chroot_dir && !username) {
 376                 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
 377                 exit(1);
 378         }
 379
 380         pw = getpwnam(username);
 381         if (pw) {
 382                 if (chroot_dir) {
 383                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
 384                                 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
 385                                     chroot_dir, pcap_strerror(errno));
 386                                 exit(1);
 387                         }
 388                 }
 389                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
 390                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
 391                         fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
 392                             username,
 393                             (unsigned long)pw->pw_uid,
 394                             (unsigned long)pw->pw_gid,
 395                             pcap_strerror(errno));
 396                         exit(1);
 397                 }
 398         }
 399         else {
 400                 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
 401                     username);
 402                 exit(1);
 403         }
 404 }
 405 #endif /* WIN32 */
 406
 407 static int
 408 getWflagChars(int x)
 409 {
 410         int c = 0;
 411
 412         x -= 1;
 413         while (x > 0) {
 414                 c += 1;
 415                 x /= 10;
 416         }
 417
 418         return c;
 419 }
 420
 421
 422 static void
 423 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
 424 {
 425         if (cnt == 0 && max_chars == 0)
 426                 strcpy(buffer, orig_name);
 427         else
 428                 sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
 429 }
 430
 431 static int tcpdump_printf(netdissect_options *ndo _U_,
 432                           const char *fmt, ...)
 433 {
 434
 435   va_list args;
 436   int ret;
 437
 438   va_start(args, fmt);
 439   ret=vfprintf(stdout, fmt, args);
 440   va_end(args);
 441
 442   return ret;
 443 }
 444
 445 int
 446 main(int argc, char **argv)
 447 {
 448         register int cnt, op, i;
 449         bpf_u_int32 localnet, netmask;
 450         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
 451         pcap_handler callback;
 452         int type;
 453         struct bpf_program fcode;
 454 #ifndef WIN32
 455         RETSIGTYPE (*oldhandler)(int);
 456 #endif
 457         struct print_info printinfo;
 458         struct dump_info dumpinfo;
 459         u_char *pcap_userdata;
 460         char ebuf[PCAP_ERRBUF_SIZE];
 461         char *username = NULL;
 462         char *chroot_dir = NULL;
 463 #ifdef HAVE_PCAP_FINDALLDEVS
 464         pcap_if_t *devpointer;
 465         int devnum;
 466 #endif
 467         int status;
 468 #ifdef WIN32
 469         u_int UserBufferSize = 1000000;
 470         if(wsockinit() != 0) return 1;
 471 #endif /* WIN32 */
 472
 473         gndo->ndo_Oflag=1;
 474         gndo->ndo_Rflag=1;
 475         gndo->ndo_dlt=-1;
 476         gndo->ndo_default_print=ndo_default_print;
 477         gndo->ndo_printf=tcpdump_printf;
 478         gndo->ndo_error=ndo_error;
 479         gndo->ndo_warning=ndo_warning;
 480         gndo->ndo_snaplen = DEFAULT_SNAPLEN;
 481
 482         cnt = -1;
 483         device = NULL;
 484         infile = NULL;
 485         RFileName = NULL;
 486         WFileName = NULL;
 487         if ((cp = strrchr(argv[0], '/')) != NULL)
 488                 program_name = cp + 1;
 489         else
 490                 program_name = argv[0];
 491
 492         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 493                 error("%s", ebuf);
 494
 495 #ifdef LIBSMI
 496         smiInit("tcpdump");
 497 #endif
 498
 499         opterr = 0;
 500         while (
 501             (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)
 502                 switch (op) {
 503
 504                 case 'a':
 505                         /* compatibility for old -a */
 506                         break;
 507
 508                 case 'A':
 509                         ++Aflag;
 510                         break;
 511
 512 #ifdef WIN32
 513                 case 'B':
 514                         UserBufferSize = atoi(optarg)*1024;
 515                         if (UserBufferSize < 0)
 516                                 error("invalid packet buffer size %s", optarg);
 517                         break;
 518 #endif /* WIN32 */
 519
 520                 case 'c':
 521                         cnt = atoi(optarg);
 522                         if (cnt <= 0)
 523                                 error("invalid packet count %s", optarg);
 524                         break;
 525
 526                 case 'C':
 527                         Cflag = atoi(optarg) * 1000000;
 528                         if (Cflag < 0)
 529                                 error("invalid file size %s", optarg);
 530                         break;
 531
 532                 case 'd':
 533                         ++dflag;
 534                         break;
 535
 536 #ifdef HAVE_PCAP_FINDALLDEVS
 537                 case 'D':
 538                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 539                                 error("%s", ebuf);
 540                         else {
 541                                 for (i = 0; devpointer != 0; i++) {
 542                                         printf("%d.%s", i+1, devpointer->name);
 543                                         if (devpointer->description != NULL)
 544                                                 printf(" (%s)", devpointer->description);
 545                                         printf("\n");
 546                                         devpointer = devpointer->next;
 547                                 }
 548                         }
 549                         return 0;
 550 #endif /* HAVE_PCAP_FINDALLDEVS */
 551
 552                 case 'L':
 553                         Lflag++;
 554                         break;
 555
 556                 case 'e':
 557                         ++eflag;
 558                         break;
 559
 560                 case 'E':
 561 #ifndef HAVE_LIBCRYPTO
 562                         warning("crypto code not compiled in");
 563 #endif
 564                         gndo->ndo_espsecret = optarg;
 565                         break;
 566
 567                 case 'f':
 568                         ++fflag;
 569                         break;
 570
 571                 case 'F':
 572                         infile = optarg;
 573                         break;
 574
 575                 case 'i':
 576                         if (optarg[0] == '0' && optarg[1] == 0)
 577                                 error("Invalid adapter index");
 578
 579 #ifdef HAVE_PCAP_FINDALLDEVS
 580                         /*
 581                          * If the argument is a number, treat it as
 582                          * an index into the list of adapters, as
 583                          * printed by "tcpdump -D".
 584                          *
 585                          * This should be OK on UNIX systems, as interfaces
 586                          * shouldn't have names that begin with digits.
 587                          * It can be useful on Windows, where more than
 588                          * one interface can have the same name.
 589                          */
 590                         if ((devnum = atoi(optarg)) != 0) {
 591                                 if (devnum < 0)
 592                                         error("Invalid adapter index");
 593
 594                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 595                                         error("%s", ebuf);
 596                                 else {
 597                                         for (i = 0; i < devnum-1; i++){
 598                                                 devpointer = devpointer->next;
 599                                                 if (devpointer == NULL)
 600                                                         error("Invalid adapter index");
 601                                         }
 602                                 }
 603                                 device = devpointer->name;
 604                                 break;
 605                         }
 606 #endif /* HAVE_PCAP_FINDALLDEVS */
 607                         device = optarg;
 608                         break;
 609
 610                 case 'l':
 611 #ifdef WIN32
 612                         /*
 613                          * _IOLBF is the same as _IOFBF in Microsoft's C
 614                          * libraries; the only alternative they offer
 615                          * is _IONBF.
 616                          *
 617                          * XXX - this should really be checking for MSVC++,
 618                          * not WIN32, if, for example, MinGW has its own
 619                          * C library that is more UNIX-compatible.
 620                          */
 621                         setvbuf(stdout, NULL, _IONBF, 0);
 622 #else /* WIN32 */
 623 #ifdef HAVE_SETLINEBUF
 624                         setlinebuf(stdout);
 625 #else
 626                         setvbuf(stdout, NULL, _IOLBF, 0);
 627 #endif
 628 #endif /* WIN32 */
 629                         break;
 630
 631                 case 'n':
 632                         ++nflag;
 633                         break;
 634
 635                 case 'N':
 636                         ++Nflag;
 637                         break;
 638
 639                 case 'm':
 640 #ifdef LIBSMI
 641                         if (smiLoadModule(optarg) == 0) {
 642                                 error("could not load MIB module %s", optarg);
 643                         }
 644                         sflag = 1;
 645 #else
 646                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 647                                       program_name, optarg);
 648                         (void)fprintf(stderr, "(no libsmi support)\n");
 649 #endif
 650                         break;
 651
 652                 case 'M':
 653                         /* TCP-MD5 shared secret */
 654 #ifndef HAVE_LIBCRYPTO
 655                         warning("crypto code not compiled in");
 656 #endif
 657                         tcpmd5secret = optarg;
 658                         break;
 659
 660                 case 'O':
 661                         Oflag = 0;
 662                         break;
 663
 664                 case 'p':
 665                         ++pflag;
 666                         break;
 667
 668                 case 'q':
 669                         ++qflag;
 670                         ++suppress_default_print;
 671                         break;
 672
 673                 case 'r':
 674                         RFileName = optarg;
 675                         break;
 676
 677                 case 'R':
 678                         Rflag = 0;
 679                         break;
 680
 681                 case 's': {
 682                         char *end;
 683
 684                         snaplen = strtol(optarg, &end, 0);
 685                         if (optarg == end || *end != '\0'
 686                             || snaplen < 0 || snaplen > 65535)
 687                                 error("invalid snaplen %s", optarg);
 688                         else if (snaplen == 0)
 689                                 snaplen = 65535;
 690                         break;
 691                 }
 692
 693                 case 'S':
 694                         ++Sflag;
 695                         break;
 696
 697                 case 't':
 698                         ++tflag;
 699                         break;
 700
 701                 case 'T':
 702                         if (strcasecmp(optarg, "vat") == 0)
 703                                 packettype = PT_VAT;
 704                         else if (strcasecmp(optarg, "wb") == 0)
 705                                 packettype = PT_WB;
 706                         else if (strcasecmp(optarg, "rpc") == 0)
 707                                 packettype = PT_RPC;
 708                         else if (strcasecmp(optarg, "rtp") == 0)
 709                                 packettype = PT_RTP;
 710                         else if (strcasecmp(optarg, "rtcp") == 0)
 711                                 packettype = PT_RTCP;
 712                         else if (strcasecmp(optarg, "snmp") == 0)
 713                                 packettype = PT_SNMP;
 714                         else if (strcasecmp(optarg, "cnfp") == 0)
 715                                 packettype = PT_CNFP;
 716                         else if (strcasecmp(optarg, "tftp") == 0)
 717                                 packettype = PT_TFTP;
 718                         else if (strcasecmp(optarg, "aodv") == 0)
 719                                 packettype = PT_AODV;
 720                         else
 721                                 error("unknown packet type `%s'", optarg);
 722                         break;
 723
 724                 case 'u':
 725                         ++uflag;
 726                         break;
 727
 728 #ifdef HAVE_PCAP_DUMP_FLUSH
 729                 case 'U':
 730                         ++Uflag;
 731                         break;
 732 #endif
 733
 734                 case 'v':
 735                         ++vflag;
 736                         break;
 737
 738                 case 'w':
 739                         WFileName = optarg;
 740                         break;
 741
 742                 case 'W':
 743                         Wflag = atoi(optarg);
 744                         if (Wflag < 0)
 745                                 error("invalid number of output files %s", optarg);
 746                         WflagChars = getWflagChars(Wflag);
 747                         break;
 748
 749                 case 'x':
 750                         ++xflag;
 751                         ++suppress_default_print;
 752                         break;
 753
 754                 case 'X':
 755                         ++Xflag;
 756                         ++suppress_default_print;
 757                         break;
 758
 759                 case 'y':
 760                         gndo->ndo_dltname = optarg;
 761                         gndo->ndo_dlt =
 762                           pcap_datalink_name_to_val(gndo->ndo_dltname);
 763                         if (gndo->ndo_dlt < 0)
 764                                 error("invalid data link type %s", gndo->ndo_dltname);
 765                         break;
 766
 767 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 768                 case 'Y':
 769                         {
 770                         /* Undocumented flag */
 771 #ifdef HAVE_PCAP_DEBUG
 772                         extern int pcap_debug;
 773                         pcap_debug = 1;
 774 #else
 775                         extern int yydebug;
 776                         yydebug = 1;
 777 #endif
 778                         }
 779                         break;
 780 #endif
 781                 case 'Z':
 782                         if (optarg) {
 783                                 username = strdup(optarg);
 784                         }
 785                         else {
 786                                 usage();
 787                                 /* NOTREACHED */
 788                         }
 789                         break;
 790
 791                 default:
 792                         usage();
 793                         /* NOTREACHED */
 794                 }
 795
 796         switch (tflag) {
 797
 798         case 0: /* Default */
 799         case 4: /* Default + Date*/
 800                 thiszone = gmt2local(0);
 801                 break;
 802
 803         case 1: /* No time stamp */
 804         case 2: /* Unix timeval style */
 805         case 3: /* Microseconds since previous packet */
 806                 break;
 807
 808         default: /* Not supported */
 809                 error("only -t, -tt, -ttt, and -tttt are supported");
 810                 break;
 811         }
 812
 813 #ifdef WITH_CHROOT
 814         /* if run as root, prepare for chrooting */
 815         if (getuid() == 0 || geteuid() == 0) {
 816                 /* future extensibility for cmd-line arguments */
 817                 if (!chroot_dir)
 818                         chroot_dir = WITH_CHROOT;
 819         }
 820 #endif
 821
 822 #ifdef WITH_USER
 823         /* if run as root, prepare for dropping root privileges */
 824         if (getuid() == 0 || geteuid() == 0) {
 825                 /* Run with '-Z root' to restore old behaviour */
 826                 if (!username)
 827                         username = WITH_USER;
 828         }
 829 #endif
 830
 831         if (RFileName != NULL) {
 832                 int dlt;
 833                 const char *dlt_name;
 834
 835 #ifndef WIN32
 836                 /*
 837                  * We don't need network access, so relinquish any set-UID
 838                  * or set-GID privileges we have (if any).
 839                  *
 840                  * We do *not* want set-UID privileges when opening a
 841                  * trace file, as that might let the user read other
 842                  * people's trace files (especially if we're set-UID
 843                  * root).
 844                  */
 845                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
 846                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 847 #endif /* WIN32 */
 848                 pd = pcap_open_offline(RFileName, ebuf);
 849                 if (pd == NULL)
 850                         error("%s", ebuf);
 851                 dlt = pcap_datalink(pd);
 852                 dlt_name = pcap_datalink_val_to_name(dlt);
 853                 if (dlt_name == NULL) {
 854                         fprintf(stderr, "reading from file %s, link-type %u\n",
 855                             RFileName, dlt);
 856                 } else {
 857                         fprintf(stderr,
 858                             "reading from file %s, link-type %s (%s)\n",
 859                             RFileName, dlt_name,
 860                             pcap_datalink_val_to_description(dlt));
 861                 }
 862                 localnet = 0;
 863                 netmask = 0;
 864                 if (fflag != 0)
 865                         error("-f and -r options are incompatible");
 866         } else {
 867                 if (device == NULL) {
 868                         device = pcap_lookupdev(ebuf);
 869                         if (device == NULL)
 870                                 error("%s", ebuf);
 871                 }
 872 #ifdef WIN32
 873                 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
 874                 {                                               //a Unicode string has a \0 as second byte (so strlen() is 1)
 875                         fprintf(stderr, "%s: listening on %ws\n", program_name, device);
 876                 }
 877                 else
 878                 {
 879                         fprintf(stderr, "%s: listening on %s\n", program_name, device);
 880                 }
 881
 882                 fflush(stderr);
 883 #endif /* WIN32 */
 884                 *ebuf = '\0';
 885                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
 886                 if (pd == NULL)
 887                         error("%s", ebuf);
 888                 else if (*ebuf)
 889                         warning("%s", ebuf);
 890                 /*
 891                  * Let user own process after socket has been opened.
 892                  */
 893 #ifndef WIN32
 894                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
 895                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 896 #endif /* WIN32 */
 897 #ifdef WIN32
 898                 if(UserBufferSize != 1000000)
 899                         if(pcap_setbuff(pd, UserBufferSize)==-1){
 900                                 error("%s", pcap_geterr(pd));
 901                         }
 902 #endif /* WIN32 */
 903                 if (Lflag)
 904                         show_dlts_and_exit(pd);
 905                 if (gndo->ndo_dlt >= 0) {
 906 #ifdef HAVE_PCAP_SET_DATALINK
 907                         if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
 908                                 error("%s", pcap_geterr(pd));
 909 #else
 910                         /*
 911                          * We don't actually support changing the
 912                          * data link type, so we only let them
 913                          * set it to what it already is.
 914                          */
 915                         if (gndo->ndo_dlt != pcap_datalink(pd)) {
 916                                 error("%s is not one of the DLTs supported by this device\n",
 917                                       gndo->ndo_dltname);
 918                         }
 919 #endif
 920                         (void)fprintf(stderr, "%s: data link type %s\n",
 921                                       program_name, gndo->ndo_dltname);
 922                         (void)fflush(stderr);
 923                 }
 924                 i = pcap_snapshot(pd);
 925                 if (snaplen < i) {
 926                         warning("snaplen raised from %d to %d", snaplen, i);
 927                         snaplen = i;
 928                 }
 929                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 930                         localnet = 0;
 931                         netmask = 0;
 932                         warning("%s", ebuf);
 933                 }
 934         }
 935         if (infile)
 936                 cmdbuf = read_infile(infile);
 937         else
 938                 cmdbuf = copy_argv(&argv[optind]);
 939
 940         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 941                 error("%s", pcap_geterr(pd));
 942         if (dflag) {
 943                 bpf_dump(&fcode, dflag);
 944                 pcap_close(pd);
 945                 exit(0);
 946         }
 947         init_addrtoname(localnet, netmask);
 948
 949 #ifndef WIN32
 950         (void)setsignal(SIGPIPE, cleanup);
 951 #endif /* WIN32 */
 952         (void)setsignal(SIGTERM, cleanup);
 953         (void)setsignal(SIGINT, cleanup);
 954         /* Cooperate with nohup(1) */
 955 #ifndef WIN32
 956         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
 957                 (void)setsignal(SIGHUP, oldhandler);
 958 #endif /* WIN32 */
 959
 960         if (pcap_setfilter(pd, &fcode) < 0)
 961                 error("%s", pcap_geterr(pd));
 962         if (WFileName) {
 963                 pcap_dumper_t *p;
 964
 965                 WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1);
 966                 if (WFileNameAlt == NULL)
 967                         error("malloc of WFileNameAlt");
 968                 MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
 969                 p = pcap_dump_open(pd, WFileNameAlt);
 970                 if (p == NULL)
 971                         error("%s", pcap_geterr(pd));
 972                 if (Cflag != 0) {
 973                         callback = dump_packet_and_trunc;
 974                         dumpinfo.WFileName = WFileName;
 975                         dumpinfo.pd = pd;
 976                         dumpinfo.p = p;
 977                         pcap_userdata = (u_char *)&dumpinfo;
 978                 } else {
 979                         callback = dump_packet;
 980                         pcap_userdata = (u_char *)p;
 981                 }
 982         } else {
 983                 type = pcap_datalink(pd);
 984                 printinfo.printer = lookup_printer(type);
 985                 if (printinfo.printer == NULL) {
 986                         gndo->ndo_dltname = pcap_datalink_val_to_name(type);
 987                         if (gndo->ndo_dltname != NULL)
 988                                 error("unsupported data link type %s",
 989                                       gndo->ndo_dltname);
 990                         else
 991                                 error("unsupported data link type %d", type);
 992                 }
 993                 callback = print_packet;
 994                 pcap_userdata = (u_char *)&printinfo;
 995         }
 996 #ifndef WIN32
 997         /*
 998          * We cannot do this earlier, because we want to be able to open
 999          * the file (if done) for writing before giving up permissions.
1000          */
1001         if (getuid() == 0 || geteuid() == 0) {
1002                 if (username || chroot_dir)
1003                         droproot(username, chroot_dir);
1004         }
1005 #endif /* WIN32 */
1006 #ifdef SIGINFO
1007         (void)setsignal(SIGINFO, requestinfo);
1008 #endif
1009
1010         if (vflag > 0 && WFileName) {
1011                 /*
1012                  * When capturing to a file, "-v" means tcpdump should,
1013                  * every 10 secodns, "v"erbosely report the number of
1014                  * packets captured.
1015                  */
1016 #ifdef USE_WIN32_MM_TIMER
1017                 /* call verbose_stats_dump() each 1000 +/-100msec */
1018                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1019                 setvbuf(stderr, NULL, _IONBF, 0);
1020 #elif defined(HAVE_ALARM)
1021                 (void)setsignal(SIGALRM, verbose_stats_dump);
1022                 alarm(1);
1023 #endif
1024         }
1025
1026 #ifndef WIN32
1027         if (RFileName == NULL) {
1028                 int dlt;
1029                 const char *dlt_name;
1030
1031                 if (!vflag && !WFileName) {
1032                         (void)fprintf(stderr,
1033                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1034                             program_name);
1035                 } else
1036                         (void)fprintf(stderr, "%s: ", program_name);
1037                 dlt = pcap_datalink(pd);
1038                 dlt_name = pcap_datalink_val_to_name(dlt);
1039                 if (dlt_name == NULL) {
1040                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1041                             device, dlt, snaplen);
1042                 } else {
1043                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1044                             device, dlt_name,
1045                             pcap_datalink_val_to_description(dlt), snaplen);
1046                 }
1047                 (void)fflush(stderr);
1048         }
1049 #endif /* WIN32 */
1050         status = pcap_loop(pd, cnt, callback, pcap_userdata);
1051         if (WFileName == NULL) {
1052                 /*
1053                  * We're printing packets.  Flush the printed output,
1054                  * so it doesn't get intermingled with error output.
1055                  */
1056                 if (status == -2) {
1057                         /*
1058                          * We got interrupted, so perhaps we didn't
1059                          * manage to finish a line we were printing.
1060                          * Print an extra newline, just in case.
1061                          */
1062                         putchar('\n');
1063                 }
1064                 (void)fflush(stdout);
1065         }
1066         if (status == -1) {
1067                 /*
1068                  * Error.  Report it.
1069                  */
1070                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1071                     program_name, pcap_geterr(pd));
1072         }
1073         if (RFileName == NULL) {
1074                 /*
1075                  * We're doing a live capture.  Report the capture
1076                  * statistics.
1077                  */
1078                 info(1);
1079         }
1080         pcap_close(pd);
1081         exit(status == -1 ? 1 : 0);
1082 }
1083
1084 /* make a clean exit on interrupts */
1085 static RETSIGTYPE
1086 cleanup(int signo _U_)
1087 {
1088 #ifdef USE_WIN32_MM_TIMER
1089         if (timer_id)
1090                 timeKillEvent(timer_id);
1091         timer_id = 0;
1092 #elif defined(HAVE_ALARM)
1093         alarm(0);
1094 #endif
1095
1096 #ifdef HAVE_PCAP_BREAKLOOP
1097         /*
1098          * We have "pcap_breakloop()"; use it, so that we do as little
1099          * as possible in the signal handler (it's probably not safe
1100          * to do anything with standard I/O streams in a signal handler -
1101          * the ANSI C standard doesn't say it is).
1102          */
1103         pcap_breakloop(pd);
1104 #else
1105         /*
1106          * We don't have "pcap_breakloop()"; this isn't safe, but
1107          * it's the best we can do.  Print the summary if we're
1108          * not reading from a savefile - i.e., if we're doing a
1109          * live capture - and exit.
1110          */
1111         if (pd != NULL && pcap_file(pd) == NULL) {
1112                 /*
1113                  * We got interrupted, so perhaps we didn't
1114                  * manage to finish a line we were printing.
1115                  * Print an extra newline, just in case.
1116                  */
1117                 putchar('\n');
1118                 (void)fflush(stdout);
1119                 info(1);
1120         }
1121         exit(0);
1122 #endif
1123 }
1124
1125 static void
1126 info(register int verbose)
1127 {
1128         struct pcap_stat stat;
1129
1130         if (pcap_stats(pd, &stat) < 0) {
1131                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1132                 return;
1133         }
1134
1135         if (!verbose)
1136                 fprintf(stderr, "%s: ", program_name);
1137
1138         (void)fprintf(stderr, "%u packets captured", packets_captured);
1139         if (!verbose)
1140                 fputs(", ", stderr);
1141         else
1142                 putc('\n', stderr);
1143         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1144         if (!verbose)
1145                 fputs(", ", stderr);
1146         else
1147                 putc('\n', stderr);
1148         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1149         infoprint = 0;
1150 }
1151
1152 static void
1153 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1154 {
1155         struct dump_info *dump_info;
1156         char *name;
1157
1158         ++packets_captured;
1159
1160         ++infodelay;
1161
1162         dump_info = (struct dump_info *)user;
1163
1164         /*
1165          * XXX - this won't prevent capture files from getting
1166          * larger than Cflag - the last packet written to the
1167          * file could put it over Cflag.
1168          */
1169         if (pcap_dump_ftell(dump_info->p) > Cflag) {
1170                 /*
1171                  * Close the current file and open a new one.
1172                  */
1173                 pcap_dump_close(dump_info->p);
1174                 Cflag_count++;
1175                 if (Wflag > 0) {
1176                         if (Cflag_count >= Wflag)
1177                                 Cflag_count = 0;
1178                 } else {
1179                         if (Cflag_count >= MAX_CFLAG)
1180                                 error("too many output files");
1181                 }
1182                 name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1);
1183                 if (name == NULL)
1184                         error("dump_packet_and_trunc: malloc");
1185                 MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
1186                 dump_info->p = pcap_dump_open(dump_info->pd, name);
1187                 free(name);
1188                 if (dump_info->p == NULL)
1189                         error("%s", pcap_geterr(pd));
1190         }
1191
1192         pcap_dump((u_char *)dump_info->p, h, sp);
1193 #ifdef HAVE_PCAP_DUMP_FLUSH
1194         if (Uflag)
1195                 pcap_dump_flush(dump_info->p);
1196 #endif
1197
1198         --infodelay;
1199         if (infoprint)
1200                 info(0);
1201 }
1202
1203 static void
1204 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1205 {
1206         ++packets_captured;
1207
1208         ++infodelay;
1209
1210         pcap_dump(user, h, sp);
1211 #ifdef HAVE_PCAP_DUMP_FLUSH
1212         if (Uflag)
1213                 pcap_dump_flush((pcap_dumper_t *)user);
1214 #endif
1215
1216         --infodelay;
1217         if (infoprint)
1218                 info(0);
1219 }
1220
1221 static void
1222 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1223 {
1224         struct print_info *print_info;
1225         u_int hdrlen;
1226
1227         ++packets_captured;
1228
1229         ++infodelay;
1230         ts_print(&h->ts);
1231
1232         print_info = (struct print_info *)user;
1233
1234         /*
1235          * Some printers want to check that they're not walking off the
1236          * end of the packet.
1237          * Rather than pass it all the way down, we set this global.
1238          */
1239         snapend = sp + h->caplen;
1240
1241         hdrlen = (*print_info->printer)(h, sp);
1242         if (Xflag) {
1243                 /*
1244                  * Print the raw packet data in hex and ASCII.
1245                  */
1246                 if (Xflag > 1) {
1247                         /*
1248                          * Include the link-layer header.
1249                          */
1250                         hex_and_ascii_print("\n\t", sp, h->caplen);
1251                 } else {
1252                         /*
1253                          * Don't include the link-layer header - and if
1254                          * we have nothing past the link-layer header,
1255                          * print nothing.
1256                          */
1257                         if (h->caplen > hdrlen)
1258                                 hex_and_ascii_print("\n\t", sp + hdrlen,
1259                                     h->caplen - hdrlen);
1260                 }
1261         } else if (xflag) {
1262                 /*
1263                  * Print the raw packet data in hex.
1264                  */
1265                 if (xflag > 1) {
1266                         /*
1267                          * Include the link-layer header.
1268                          */
1269                         hex_print("\n\t", sp, h->caplen);
1270                 } else {
1271                         /*
1272                          * Don't include the link-layer header - and if
1273                          * we have nothing past the link-layer header,
1274                          * print nothing.
1275                          */
1276                         if (h->caplen > hdrlen)
1277                                 hex_print("\n\t", sp + hdrlen,
1278                                     h->caplen - hdrlen);
1279                 }
1280         } else if (Aflag) {
1281                 /*
1282                  * Print the raw packet data in ASCII.
1283                  */
1284                 if (Aflag > 1) {
1285                         /*
1286                          * Include the link-layer header.
1287                          */
1288                         ascii_print(sp, h->caplen);
1289                 } else {
1290                         /*
1291                          * Don't include the link-layer header - and if
1292                          * we have nothing past the link-layer header,
1293                          * print nothing.
1294                          */
1295                         if (h->caplen > hdrlen)
1296                                 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1297                 }
1298         }
1299
1300         putchar('\n');
1301
1302         --infodelay;
1303         if (infoprint)
1304                 info(0);
1305 }
1306
1307 #ifdef WIN32
1308         /*
1309          * XXX - there should really be libpcap calls to get the version
1310          * number as a string (the string would be generated from #defines
1311          * at run time, so that it's not generated from string constants
1312          * in the library, as, on many UNIX systems, those constants would
1313          * be statically linked into the application executable image, and
1314          * would thus reflect the version of libpcap on the system on
1315          * which the application was *linked*, not the system on which it's
1316          * *running*.
1317          *
1318          * That routine should be documented, unlike the "version[]"
1319          * string, so that UNIX vendors providing their own libpcaps
1320          * don't omit it (as a couple of vendors have...).
1321          *
1322          * Packet.dll should perhaps also export a routine to return the
1323          * version number of the Packet.dll code, to supply the
1324          * "Wpcap_version" information on Windows.
1325          */
1326         char WDversion[]="current-cvs.tcpdump.org";
1327 #if !defined(HAVE_GENERATED_VERSION)
1328         char version[]="current-cvs.tcpdump.org";
1329 #endif
1330         char pcap_version[]="current-cvs.tcpdump.org";
1331         char Wpcap_version[]="3.1";
1332 #endif
1333
1334 /*
1335  * By default, print the specified data out in hex and ASCII.
1336  */
1337 static void
1338 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1339 {
1340         hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1341 }
1342
1343 void
1344 default_print(const u_char *bp, u_int length)
1345 {
1346         ndo_default_print(gndo, bp, length);
1347 }
1348
1349 #ifdef SIGINFO
1350 RETSIGTYPE requestinfo(int signo _U_)
1351 {
1352         if (infodelay)
1353                 ++infoprint;
1354         else
1355                 info(0);
1356 }
1357 #endif
1358
1359 /*
1360  * Called once each second in verbose mode while dumping to file
1361  */
1362 #ifdef USE_WIN32_MM_TIMER
1363 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1364                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1365 {
1366         struct pcap_stat stat;
1367
1368         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1369                 fprintf(stderr, "Got %u\r", packets_captured);
1370 }
1371 #elif defined(HAVE_ALARM)
1372 static void verbose_stats_dump(int sig _U_)
1373 {
1374         struct pcap_stat stat;
1375
1376         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1377                 fprintf(stderr, "Got %u\r", packets_captured);
1378         alarm(1);
1379 }
1380 #endif
1381
1382 static void
1383 usage(void)
1384 {
1385         extern char version[];
1386 #ifndef HAVE_PCAP_LIB_VERSION
1387 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1388         extern char pcap_version[];
1389 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1390         static char pcap_version[] = "unknown";
1391 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1392 #endif /* HAVE_PCAP_LIB_VERSION */
1393
1394 #ifdef HAVE_PCAP_LIB_VERSION
1395 #ifdef WIN32
1396         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1397 #else /* WIN32 */
1398         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1399 #endif /* WIN32 */
1400         (void)fprintf(stderr, "%s\n",pcap_lib_version());
1401 #else /* HAVE_PCAP_LIB_VERSION */
1402 #ifdef WIN32
1403         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1404         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1405 #else /* WIN32 */
1406         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1407         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1408 #endif /* WIN32 */
1409 #endif /* HAVE_PCAP_LIB_VERSION */
1410         (void)fprintf(stderr,
1411 "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
1412         (void)fprintf(stderr,
1413 "\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -M secret ]\n");
1414         (void)fprintf(stderr,
1415 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1416         (void)fprintf(stderr,
1417 "\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
1418         (void)fprintf(stderr,
1419 "\t\t[ expression ]\n");
1420         exit(1);
1421 }
1422
1423
1424
1425 /* VARARGS */
1426 static void
1427 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1428 {
1429         va_list ap;
1430
1431         (void)fprintf(stderr, "%s: ", program_name);
1432         va_start(ap, fmt);
1433         (void)vfprintf(stderr, fmt, ap);
1434         va_end(ap);
1435         if (*fmt) {
1436                 fmt += strlen(fmt);
1437                 if (fmt[-1] != '\n')
1438                         (void)fputc('\n', stderr);
1439         }
1440         exit(1);
1441         /* NOTREACHED */
1442 }
1443
1444 /* VARARGS */
1445 static void
1446 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1447 {
1448         va_list ap;
1449
1450         (void)fprintf(stderr, "%s: WARNING: ", program_name);
1451         va_start(ap, fmt);
1452         (void)vfprintf(stderr, fmt, ap);
1453         va_end(ap);
1454         if (*fmt) {
1455                 fmt += strlen(fmt);
1456                 if (fmt[-1] != '\n')
1457                         (void)fputc('\n', stderr);
1458         }
1459 }
1460