dist/tcpdump/tcpdump.c

   1 /*      $NetBSD: tcpdump.c,v 1.8 2007/07/24 11:53:50 drochner Exp $     */
   2
   3 /*
   4  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  *
  23  * Support for splitting captures into multiple files with a maximum
  24  * file size:
  25  *
  26  * Copyright (c) 2001
  27  *      Seth Webster <swebster@sst.ll.mit.edu>
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #ifndef lint
  32 #if 0
  33 static const char copyright[] _U_ =
  34     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
  35 The Regents of the University of California.  All rights reserved.\n";
  36 static const char rcsid[] _U_ =
  37     "@(#) Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.253.2.12 2006/02/01 14:39:56 hannes Exp (LBL)";
  38 #else
  39 __RCSID("$NetBSD: tcpdump.c,v 1.8 2007/07/24 11:53:50 drochner Exp $");
  40 #endif
  41 #endif
  42
  43 /*
  44  * tcpdump - monitor tcp/ip traffic on an ethernet.
  45  *
  46  * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
  47  * Mercilessly hacked and occasionally improved since then via the
  48  * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
  49  */
  50
  51 #ifdef HAVE_CONFIG_H
  52 #include "config.h"
  53 #endif
  54
  55 #include <tcpdump-stdinc.h>
  56
  57 #ifdef WIN32
  58 #include "getopt.h"
  59 #include "w32_fzs.h"
  60 extern int strcasecmp (const char *__s1, const char *__s2);
  61 extern int SIZE_BUF;
  62 #define off_t long
  63 #define uint UINT
  64 #endif /* WIN32 */
  65
  66 #ifdef HAVE_SMI_H
  67 #include <smi.h>
  68 #endif
  69
  70 #include <pcap.h>
  71 #include <signal.h>
  72 #include <stdio.h>
  73 #include <stdlib.h>
  74 #include <string.h>
  75 #ifndef WIN32
  76 #include <pwd.h>
  77 #include <grp.h>
  78 #include <errno.h>
  79 #endif /* WIN32 */
  80
  81 #include "netdissect.h"
  82 #include "interface.h"
  83 #include "addrtoname.h"
  84 #include "machdep.h"
  85 #include "setsignal.h"
  86 #include "gmt2local.h"
  87 #include "pcap-missing.h"
  88
  89 netdissect_options Gndo;
  90 netdissect_options *gndo = &Gndo;
  91
  92 /*
  93  * Define the maximum number of files for the -C flag, and how many
  94  * characters can be added to a filename for the -C flag (which
  95  * should be enough to handle MAX_CFLAG - 1).
  96  */
  97 #define MAX_CFLAG       1000000
  98 #define MAX_CFLAG_CHARS 6
  99
 100 int dflag;                      /* print filter code */
 101 int Lflag;                      /* list available data link types and exit */
 102
 103 static int infodelay;
 104 static int infoprint;
 105
 106 char *program_name;
 107
 108 int32_t thiszone;               /* seconds offset from gmt to local time */
 109
 110 /* Forwards */
 111 static RETSIGTYPE cleanup(int);
 112 static void usage(void) __attribute__((noreturn));
 113 static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
 114
 115 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 116 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
 117 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 118 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 119 static void droproot(const char *, const char *);
 120 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
 121 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
 122
 123 #ifdef SIGINFO
 124 RETSIGTYPE requestinfo(int);
 125 #endif
 126
 127 #if defined(USE_WIN32_MM_TIMER)
 128   #include <MMsystem.h>
 129   static UINT timer_id;
 130   static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
 131 #elif defined(HAVE_ALARM)
 132   static void verbose_stats_dump(int sig);
 133 #endif
 134
 135 static void info(int);
 136 static u_int packets_captured;
 137
 138 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
 139
 140 struct printer {
 141         if_printer f;
 142         int type;
 143 };
 144
 145 static struct printer printers[] = {
 146         { arcnet_if_print,      DLT_ARCNET },
 147 #ifdef DLT_ARCNET_LINUX
 148         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 149 #endif
 150         { ether_if_print,       DLT_EN10MB },
 151         { token_if_print,       DLT_IEEE802 },
 152 #ifdef DLT_LANE8023
 153         { lane_if_print,        DLT_LANE8023 },
 154 #endif
 155 #ifdef DLT_CIP
 156         { cip_if_print,         DLT_CIP },
 157 #endif
 158 #ifdef DLT_ATM_CLIP
 159         { cip_if_print,         DLT_ATM_CLIP },
 160 #endif
 161         { sl_if_print,          DLT_SLIP },
 162 #ifdef DLT_SLIP_BSDOS
 163         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 164 #endif
 165         { ppp_if_print,         DLT_PPP },
 166 #ifdef DLT_PPP_WITHDIRECTION
 167         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 168 #endif
 169 #ifdef DLT_PPP_BSDOS
 170         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 171 #endif
 172         { fddi_if_print,        DLT_FDDI },
 173         { null_if_print,        DLT_NULL },
 174 #ifdef DLT_LOOP
 175         { null_if_print,        DLT_LOOP },
 176 #endif
 177         { raw_if_print,         DLT_RAW },
 178         { atm_if_print,         DLT_ATM_RFC1483 },
 179 #ifdef DLT_C_HDLC
 180         { chdlc_if_print,       DLT_C_HDLC },
 181 #endif
 182 #ifdef DLT_HDLC
 183         { chdlc_if_print,       DLT_HDLC },
 184 #endif
 185 #ifdef DLT_PPP_SERIAL
 186         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 187 #endif
 188 #ifdef DLT_PPP_ETHER
 189         { pppoe_if_print,       DLT_PPP_ETHER },
 190 #endif
 191 #ifdef DLT_LINUX_SLL
 192         { sll_if_print,         DLT_LINUX_SLL },
 193 #endif
 194 #ifdef DLT_IEEE802_11
 195         { ieee802_11_if_print,  DLT_IEEE802_11},
 196 #endif
 197 #ifdef DLT_LTALK
 198         { ltalk_if_print,       DLT_LTALK },
 199 #endif
 200 #ifdef DLT_PFLOG
 201         { pflog_if_print,       DLT_PFLOG },
 202 #endif
 203 #ifdef DLT_PFSYNC
 204         { pfsync_if_print,  DLT_PFSYNC },
 205 #endif
 206 #ifdef DLT_FR
 207         { fr_if_print,          DLT_FR },
 208 #endif
 209 #ifdef DLT_FRELAY
 210         { fr_if_print,          DLT_FRELAY },
 211 #endif
 212 #ifdef DLT_SUNATM
 213         { sunatm_if_print,      DLT_SUNATM },
 214 #endif
 215 #ifdef DLT_IP_OVER_FC
 216         { ipfc_if_print,        DLT_IP_OVER_FC },
 217 #endif
 218 #ifdef DLT_PRISM_HEADER
 219         { prism_if_print,       DLT_PRISM_HEADER },
 220 #endif
 221 #ifdef DLT_IEEE802_11_RADIO
 222         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 223 #endif
 224 #ifdef DLT_ENC
 225         { enc_if_print,         DLT_ENC },
 226 #endif
 227 #ifdef DLT_SYMANTEC_FIREWALL
 228         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 229 #endif
 230 #ifdef DLT_APPLE_IP_OVER_IEEE1394
 231         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
 232 #endif
 233 #ifdef DLT_JUNIPER_ATM1
 234         { juniper_atm1_print,   DLT_JUNIPER_ATM1 },
 235 #endif
 236 #ifdef DLT_JUNIPER_ATM2
 237         { juniper_atm2_print,   DLT_JUNIPER_ATM2 },
 238 #endif
 239 #ifdef DLT_JUNIPER_MFR
 240         { juniper_mfr_print,    DLT_JUNIPER_MFR },
 241 #endif
 242 #ifdef DLT_JUNIPER_MLFR
 243         { juniper_mlfr_print,   DLT_JUNIPER_MLFR },
 244 #endif
 245 #ifdef DLT_JUNIPER_MLPPP
 246         { juniper_mlppp_print,  DLT_JUNIPER_MLPPP },
 247 #endif
 248 #ifdef DLT_JUNIPER_PPPOE
 249         { juniper_pppoe_print,  DLT_JUNIPER_PPPOE },
 250 #endif
 251 #ifdef DLT_JUNIPER_PPPOE_ATM
 252         { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
 253 #endif
 254 #ifdef DLT_JUNIPER_GGSN
 255         { juniper_ggsn_print,   DLT_JUNIPER_GGSN },
 256 #endif
 257 #ifdef DLT_JUNIPER_ES
 258         { juniper_es_print,     DLT_JUNIPER_ES },
 259 #endif
 260 #ifdef DLT_JUNIPER_MONITOR
 261         { juniper_monitor_print, DLT_JUNIPER_MONITOR },
 262 #endif
 263 #ifdef DLT_JUNIPER_SERVICES
 264         { juniper_services_print, DLT_JUNIPER_SERVICES },
 265 #endif
 266 #ifdef DLT_JUNIPER_ETHER
 267         { juniper_ether_print, DLT_JUNIPER_ETHER },
 268 #endif
 269 #ifdef DLT_JUNIPER_PPP
 270         { juniper_ppp_print, DLT_JUNIPER_PPP },
 271 #endif
 272 #ifdef DLT_JUNIPER_FRELAY
 273         { juniper_frelay_print, DLT_JUNIPER_FRELAY },
 274 #endif
 275 #ifdef DLT_JUNIPER_CHDLC
 276         { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
 277 #endif
 278 #ifdef DLT_MFR
 279         { mfr_if_print, DLT_MFR },
 280 #endif
 281         { NULL,                 0 },
 282 };
 283
 284 static if_printer
 285 lookup_printer(int type)
 286 {
 287         struct printer *p;
 288
 289         for (p = printers; p->f; ++p)
 290                 if (type == p->type)
 291                         return p->f;
 292
 293         return NULL;
 294         /* NOTREACHED */
 295 }
 296
 297 static pcap_t *pd;
 298
 299 extern int optind;
 300 extern int opterr;
 301 extern char *optarg;
 302
 303 struct print_info {
 304         if_printer printer;
 305 };
 306
 307 struct dump_info {
 308         char    *WFileName;
 309         pcap_t  *pd;
 310         pcap_dumper_t *p;
 311 };
 312
 313 static void
 314 show_dlts_and_exit(pcap_t *pd)
 315 {
 316         int n_dlts;
 317         int *dlts = 0;
 318         const char *dlt_name;
 319
 320         n_dlts = pcap_list_datalinks(pd, &dlts);
 321         if (n_dlts < 0)
 322                 error("%s", pcap_geterr(pd));
 323         else if (n_dlts == 0 || !dlts)
 324                 error("No data link types.");
 325
 326         (void) fprintf(stderr, "Data link types (use option -y to set):\n");
 327
 328         while (--n_dlts >= 0) {
 329                 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
 330                 if (dlt_name != NULL) {
 331                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
 332                             pcap_datalink_val_to_description(dlts[n_dlts]));
 333
 334                         /*
 335                          * OK, does tcpdump handle that type?
 336                          */
 337                         if (lookup_printer(dlts[n_dlts]) == NULL)
 338                                 (void) fprintf(stderr, " (not supported)");
 339                         putchar('\n');
 340                 } else {
 341                         (void) fprintf(stderr, "  DLT %d (not supported)\n",
 342                             dlts[n_dlts]);
 343                 }
 344         }
 345         free(dlts);
 346         exit(0);
 347 }
 348
 349 /*
 350  * Set up flags that might or might not be supported depending on the
 351  * version of libpcap we're using.
 352  */
 353 #ifdef WIN32
 354 #define B_FLAG          "B:"
 355 #define B_FLAG_USAGE    " [ -B size ]"
 356 #else /* WIN32 */
 357 #define B_FLAG
 358 #define B_FLAG_USAGE
 359 #endif /* WIN32 */
 360
 361 #ifdef HAVE_PCAP_FINDALLDEVS
 362 #ifndef HAVE_PCAP_IF_T
 363 #undef HAVE_PCAP_FINDALLDEVS
 364 #endif
 365 #endif
 366
 367 #ifdef HAVE_PCAP_FINDALLDEVS
 368 #define D_FLAG  "D"
 369 #else
 370 #define D_FLAG
 371 #endif
 372
 373 #ifdef HAVE_PCAP_DUMP_FLUSH
 374 #define U_FLAG  "U"
 375 #else
 376 #define U_FLAG
 377 #endif
 378
 379 #ifndef WIN32
 380 /* Drop root privileges and chroot if necessary */
 381 static void
 382 droproot(const char *username, const char *chroot_dir)
 383 {
 384         struct passwd *pw = NULL;
 385
 386         if (chroot_dir && !username) {
 387                 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
 388                 exit(1);
 389         }
 390
 391         pw = getpwnam(username);
 392         if (pw) {
 393                 if (chroot_dir) {
 394                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
 395                                 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
 396                                     chroot_dir, pcap_strerror(errno));
 397                                 exit(1);
 398                         }
 399                 }
 400                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
 401                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
 402                         fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
 403                             username,
 404                             (unsigned long)pw->pw_uid,
 405                             (unsigned long)pw->pw_gid,
 406                             pcap_strerror(errno));
 407                         exit(1);
 408                 }
 409         }
 410         else {
 411                 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
 412                     username);
 413                 exit(1);
 414         }
 415 }
 416 #endif /* WIN32 */
 417
 418 static int
 419 getWflagChars(int x)
 420 {
 421         int c = 0;
 422
 423         x -= 1;
 424         while (x > 0) {
 425                 c += 1;
 426                 x /= 10;
 427         }
 428
 429         return c;
 430 }
 431
 432
 433 static void
 434 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
 435 {
 436         if (cnt == 0 && max_chars == 0)
 437                 strcpy(buffer, orig_name);
 438         else
 439                 sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
 440 }
 441
 442 static int tcpdump_printf(netdissect_options *ndo _U_,
 443                           const char *fmt, ...)
 444 {
 445
 446   va_list args;
 447   int ret;
 448
 449   va_start(args, fmt);
 450   ret=vfprintf(stdout, fmt, args);
 451   va_end(args);
 452
 453   return ret;
 454 }
 455
 456 int
 457 main(int argc, char **argv)
 458 {
 459         register int cnt, op, i;
 460         bpf_u_int32 localnet, netmask;
 461         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
 462         pcap_handler callback;
 463         int type;
 464         struct bpf_program fcode;
 465 #ifndef WIN32
 466         RETSIGTYPE (*oldhandler)(int);
 467 #endif
 468         struct print_info printinfo;
 469         struct dump_info dumpinfo;
 470         u_char *pcap_userdata;
 471         char ebuf[PCAP_ERRBUF_SIZE];
 472         char *username = NULL;
 473         char *chroot_dir = NULL;
 474 #ifdef HAVE_PCAP_FINDALLDEVS
 475         pcap_if_t *devpointer;
 476         int devnum;
 477 #endif
 478         int status;
 479 #ifdef WIN32
 480         u_int UserBufferSize = 1000000;
 481         if(wsockinit() != 0) return 1;
 482 #endif /* WIN32 */
 483
 484         gndo->ndo_Oflag=1;
 485         gndo->ndo_Rflag=1;
 486         gndo->ndo_dlt=-1;
 487         gndo->ndo_default_print=ndo_default_print;
 488         gndo->ndo_printf=tcpdump_printf;
 489         gndo->ndo_error=ndo_error;
 490         gndo->ndo_warning=ndo_warning;
 491         gndo->ndo_snaplen = DEFAULT_SNAPLEN;
 492
 493         cnt = -1;
 494         device = NULL;
 495         infile = NULL;
 496         RFileName = NULL;
 497         WFileName = NULL;
 498         if ((cp = strrchr(argv[0], '/')) != NULL)
 499                 program_name = cp + 1;
 500         else
 501                 program_name = argv[0];
 502
 503         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 504                 error("%s", ebuf);
 505
 506 #ifdef LIBSMI
 507         smiInit("tcpdump");
 508 #endif
 509
 510         opterr = 0;
 511         while (
 512             (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)
 513                 switch (op) {
 514
 515                 case 'a':
 516                         /* compatibility for old -a */
 517                         break;
 518
 519                 case 'A':
 520                         ++Aflag;
 521                         break;
 522
 523 #ifdef WIN32
 524                 case 'B':
 525                         UserBufferSize = atoi(optarg)*1024;
 526                         if (UserBufferSize < 0)
 527                                 error("invalid packet buffer size %s", optarg);
 528                         break;
 529 #endif /* WIN32 */
 530
 531                 case 'c':
 532                         cnt = atoi(optarg);
 533                         if (cnt <= 0)
 534                                 error("invalid packet count %s", optarg);
 535                         break;
 536
 537                 case 'C':
 538                         Cflag = atoi(optarg) * 1000000;
 539                         if (Cflag < 0)
 540                                 error("invalid file size %s", optarg);
 541                         break;
 542
 543                 case 'd':
 544                         ++dflag;
 545                         break;
 546
 547 #ifdef HAVE_PCAP_FINDALLDEVS
 548                 case 'D':
 549                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 550                                 error("%s", ebuf);
 551                         else {
 552                                 for (i = 0; devpointer != 0; i++) {
 553                                         printf("%d.%s", i+1, devpointer->name);
 554                                         if (devpointer->description != NULL)
 555                                                 printf(" (%s)", devpointer->description);
 556                                         printf("\n");
 557                                         devpointer = devpointer->next;
 558                                 }
 559                         }
 560                         return 0;
 561 #endif /* HAVE_PCAP_FINDALLDEVS */
 562
 563                 case 'L':
 564                         Lflag++;
 565                         break;
 566
 567                 case 'e':
 568                         ++eflag;
 569                         break;
 570
 571                 case 'E':
 572 #ifndef HAVE_LIBCRYPTO
 573                         warning("crypto code not compiled in");
 574 #endif
 575                         gndo->ndo_espsecret = optarg;
 576                         break;
 577
 578                 case 'f':
 579                         ++fflag;
 580                         break;
 581
 582                 case 'F':
 583                         infile = optarg;
 584                         break;
 585
 586                 case 'i':
 587                         if (optarg[0] == '0' && optarg[1] == 0)
 588                                 error("Invalid adapter index");
 589
 590 #ifdef HAVE_PCAP_FINDALLDEVS
 591                         /*
 592                          * If the argument is a number, treat it as
 593                          * an index into the list of adapters, as
 594                          * printed by "tcpdump -D".
 595                          *
 596                          * This should be OK on UNIX systems, as interfaces
 597                          * shouldn't have names that begin with digits.
 598                          * It can be useful on Windows, where more than
 599                          * one interface can have the same name.
 600                          */
 601                         if ((devnum = atoi(optarg)) != 0) {
 602                                 if (devnum < 0)
 603                                         error("Invalid adapter index");
 604
 605                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 606                                         error("%s", ebuf);
 607                                 else {
 608                                         for (i = 0; i < devnum-1; i++){
 609                                                 devpointer = devpointer->next;
 610                                                 if (devpointer == NULL)
 611                                                         error("Invalid adapter index");
 612                                         }
 613                                 }
 614                                 device = devpointer->name;
 615                                 break;
 616                         }
 617 #endif /* HAVE_PCAP_FINDALLDEVS */
 618                         device = optarg;
 619                         break;
 620
 621                 case 'l':
 622 #ifdef WIN32
 623                         /*
 624                          * _IOLBF is the same as _IOFBF in Microsoft's C
 625                          * libraries; the only alternative they offer
 626                          * is _IONBF.
 627                          *
 628                          * XXX - this should really be checking for MSVC++,
 629                          * not WIN32, if, for example, MinGW has its own
 630                          * C library that is more UNIX-compatible.
 631                          */
 632                         setvbuf(stdout, NULL, _IONBF, 0);
 633 #else /* WIN32 */
 634 #ifdef HAVE_SETLINEBUF
 635                         setlinebuf(stdout);
 636 #else
 637                         setvbuf(stdout, NULL, _IOLBF, 0);
 638 #endif
 639 #endif /* WIN32 */
 640                         break;
 641
 642                 case 'n':
 643                         ++nflag;
 644                         break;
 645
 646                 case 'N':
 647                         ++Nflag;
 648                         break;
 649
 650                 case 'm':
 651 #ifdef LIBSMI
 652                         if (smiLoadModule(optarg) == 0) {
 653                                 error("could not load MIB module %s", optarg);
 654                         }
 655                         sflag = 1;
 656 #else
 657                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 658                                       program_name, optarg);
 659                         (void)fprintf(stderr, "(no libsmi support)\n");
 660 #endif
 661                         break;
 662
 663                 case 'M':
 664                         /* TCP-MD5 shared secret */
 665 #ifndef HAVE_LIBCRYPTO
 666                         warning("crypto code not compiled in");
 667 #endif
 668                         tcpmd5secret = optarg;
 669                         break;
 670
 671                 case 'O':
 672                         Oflag = 0;
 673                         break;
 674
 675                 case 'p':
 676                         ++pflag;
 677                         break;
 678
 679                 case 'q':
 680                         ++qflag;
 681                         ++suppress_default_print;
 682                         break;
 683
 684                 case 'r':
 685                         RFileName = optarg;
 686                         break;
 687
 688                 case 'R':
 689                         Rflag = 0;
 690                         break;
 691
 692                 case 's': {
 693                         char *end;
 694
 695                         snaplen = strtol(optarg, &end, 0);
 696                         if (optarg == end || *end != '\0'
 697                             || snaplen < 0 || snaplen > 65535)
 698                                 error("invalid snaplen %s", optarg);
 699                         else if (snaplen == 0)
 700                                 snaplen = 65535;
 701                         break;
 702                 }
 703
 704                 case 'S':
 705                         ++Sflag;
 706                         break;
 707
 708                 case 't':
 709                         ++tflag;
 710                         break;
 711
 712                 case 'T':
 713                         if (strcasecmp(optarg, "vat") == 0)
 714                                 packettype = PT_VAT;
 715                         else if (strcasecmp(optarg, "wb") == 0)
 716                                 packettype = PT_WB;
 717                         else if (strcasecmp(optarg, "rpc") == 0)
 718                                 packettype = PT_RPC;
 719                         else if (strcasecmp(optarg, "rtp") == 0)
 720                                 packettype = PT_RTP;
 721                         else if (strcasecmp(optarg, "rtcp") == 0)
 722                                 packettype = PT_RTCP;
 723                         else if (strcasecmp(optarg, "snmp") == 0)
 724                                 packettype = PT_SNMP;
 725                         else if (strcasecmp(optarg, "cnfp") == 0)
 726                                 packettype = PT_CNFP;
 727                         else if (strcasecmp(optarg, "tftp") == 0)
 728                                 packettype = PT_TFTP;
 729                         else if (strcasecmp(optarg, "aodv") == 0)
 730                                 packettype = PT_AODV;
 731                         else
 732                                 error("unknown packet type `%s'", optarg);
 733                         break;
 734
 735                 case 'u':
 736                         ++uflag;
 737                         break;
 738
 739 #ifdef HAVE_PCAP_DUMP_FLUSH
 740                 case 'U':
 741                         ++Uflag;
 742                         break;
 743 #endif
 744
 745                 case 'v':
 746                         ++vflag;
 747                         break;
 748
 749                 case 'w':
 750                         WFileName = optarg;
 751                         break;
 752
 753                 case 'W':
 754                         Wflag = atoi(optarg);
 755                         if (Wflag < 0)
 756                                 error("invalid number of output files %s", optarg);
 757                         WflagChars = getWflagChars(Wflag);
 758                         break;
 759
 760                 case 'x':
 761                         ++xflag;
 762                         ++suppress_default_print;
 763                         break;
 764
 765                 case 'X':
 766                         ++Xflag;
 767                         ++suppress_default_print;
 768                         break;
 769
 770                 case 'y':
 771                         gndo->ndo_dltname = optarg;
 772                         gndo->ndo_dlt =
 773                           pcap_datalink_name_to_val(gndo->ndo_dltname);
 774                         if (gndo->ndo_dlt < 0)
 775                                 error("invalid data link type %s", gndo->ndo_dltname);
 776                         break;
 777
 778 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 779                 case 'Y':
 780                         {
 781                         /* Undocumented flag */
 782 #ifdef HAVE_PCAP_DEBUG
 783                         extern int pcap_debug;
 784                         pcap_debug = 1;
 785 #else
 786                         extern int yydebug;
 787                         yydebug = 1;
 788 #endif
 789                         }
 790                         break;
 791 #endif
 792                 case 'Z':
 793                         if (optarg) {
 794                                 username = strdup(optarg);
 795                         }
 796                         else {
 797                                 usage();
 798                                 /* NOTREACHED */
 799                         }
 800                         break;
 801
 802                 default:
 803                         usage();
 804                         /* NOTREACHED */
 805                 }
 806
 807         switch (tflag) {
 808
 809         case 0: /* Default */
 810         case 4: /* Default + Date*/
 811                 thiszone = gmt2local(0);
 812                 break;
 813
 814         case 1: /* No time stamp */
 815         case 2: /* Unix timeval style */
 816         case 3: /* Microseconds since previous packet */
 817                 break;
 818
 819         default: /* Not supported */
 820                 error("only -t, -tt, -ttt, and -tttt are supported");
 821                 break;
 822         }
 823
 824 #ifdef WITH_CHROOT
 825         /* if run as root, prepare for chrooting */
 826         if (getuid() == 0 || geteuid() == 0) {
 827                 /* future extensibility for cmd-line arguments */
 828                 if (!chroot_dir)
 829                         chroot_dir = WITH_CHROOT;
 830         }
 831 #endif
 832
 833 #ifdef WITH_USER
 834         /* if run as root, prepare for dropping root privileges */
 835         if (getuid() == 0 || geteuid() == 0) {
 836                 /* Run with '-Z root' to restore old behaviour */
 837                 if (!username)
 838                         username = WITH_USER;
 839         }
 840 #endif
 841
 842         if (RFileName != NULL) {
 843                 int dlt;
 844                 const char *dlt_name;
 845
 846 #ifndef WIN32
 847                 /*
 848                  * We don't need network access, so relinquish any set-UID
 849                  * or set-GID privileges we have (if any).
 850                  *
 851                  * We do *not* want set-UID privileges when opening a
 852                  * trace file, as that might let the user read other
 853                  * people's trace files (especially if we're set-UID
 854                  * root).
 855                  */
 856                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
 857                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 858 #endif /* WIN32 */
 859                 pd = pcap_open_offline(RFileName, ebuf);
 860                 if (pd == NULL)
 861                         error("%s", ebuf);
 862                 dlt = pcap_datalink(pd);
 863                 dlt_name = pcap_datalink_val_to_name(dlt);
 864                 if (dlt_name == NULL) {
 865                         fprintf(stderr, "reading from file %s, link-type %u\n",
 866                             RFileName, dlt);
 867                 } else {
 868                         fprintf(stderr,
 869                             "reading from file %s, link-type %s (%s)\n",
 870                             RFileName, dlt_name,
 871                             pcap_datalink_val_to_description(dlt));
 872                 }
 873                 localnet = 0;
 874                 netmask = 0;
 875                 if (fflag != 0)
 876                         error("-f and -r options are incompatible");
 877         } else {
 878                 if (device == NULL) {
 879                         device = pcap_lookupdev(ebuf);
 880                         if (device == NULL)
 881                                 error("%s", ebuf);
 882                 }
 883 #ifdef WIN32
 884                 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
 885                 {                                               //a Unicode string has a \0 as second byte (so strlen() is 1)
 886                         fprintf(stderr, "%s: listening on %ws\n", program_name, device);
 887                 }
 888                 else
 889                 {
 890                         fprintf(stderr, "%s: listening on %s\n", program_name, device);
 891                 }
 892
 893                 fflush(stderr);
 894 #endif /* WIN32 */
 895                 *ebuf = '\0';
 896                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
 897                 if (pd == NULL)
 898                         error("%s", ebuf);
 899                 else if (*ebuf)
 900                         warning("%s", ebuf);
 901                 /*
 902                  * Let user own process after socket has been opened.
 903                  */
 904 #ifndef WIN32
 905                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
 906                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 907 #endif /* WIN32 */
 908 #ifdef WIN32
 909                 if(UserBufferSize != 1000000)
 910                         if(pcap_setbuff(pd, UserBufferSize)==-1){
 911                                 error("%s", pcap_geterr(pd));
 912                         }
 913 #endif /* WIN32 */
 914                 if (Lflag)
 915                         show_dlts_and_exit(pd);
 916                 if (gndo->ndo_dlt >= 0) {
 917 #ifdef HAVE_PCAP_SET_DATALINK
 918                         if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
 919                                 error("%s", pcap_geterr(pd));
 920 #else
 921                         /*
 922                          * We don't actually support changing the
 923                          * data link type, so we only let them
 924                          * set it to what it already is.
 925                          */
 926                         if (gndo->ndo_dlt != pcap_datalink(pd)) {
 927                                 error("%s is not one of the DLTs supported by this device\n",
 928                                       gndo->ndo_dltname);
 929                         }
 930 #endif
 931                         (void)fprintf(stderr, "%s: data link type %s\n",
 932                                       program_name, gndo->ndo_dltname);
 933                         (void)fflush(stderr);
 934                 }
 935                 i = pcap_snapshot(pd);
 936                 if (snaplen < i) {
 937                         warning("snaplen raised from %d to %d", snaplen, i);
 938                         snaplen = i;
 939                 }
 940                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 941                         localnet = 0;
 942                         netmask = 0;
 943                         warning("%s", ebuf);
 944                 }
 945         }
 946         if (infile)
 947                 cmdbuf = read_infile(infile);
 948         else
 949                 cmdbuf = copy_argv(&argv[optind]);
 950
 951         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 952                 error("%s", pcap_geterr(pd));
 953         if (dflag) {
 954                 bpf_dump(&fcode, dflag);
 955                 pcap_close(pd);
 956                 exit(0);
 957         }
 958         init_addrtoname(localnet, netmask);
 959
 960 #ifndef WIN32
 961         (void)setsignal(SIGPIPE, cleanup);
 962 #endif /* WIN32 */
 963         (void)setsignal(SIGTERM, cleanup);
 964         (void)setsignal(SIGINT, cleanup);
 965         /* Cooperate with nohup(1) */
 966 #ifndef WIN32
 967         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
 968                 (void)setsignal(SIGHUP, oldhandler);
 969 #endif /* WIN32 */
 970
 971         if (pcap_setfilter(pd, &fcode) < 0)
 972                 error("%s", pcap_geterr(pd));
 973         if (WFileName) {
 974                 pcap_dumper_t *p;
 975
 976                 WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1);
 977                 if (WFileNameAlt == NULL)
 978                         error("malloc of WFileNameAlt");
 979                 MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
 980                 p = pcap_dump_open(pd, WFileNameAlt);
 981                 if (p == NULL)
 982                         error("%s", pcap_geterr(pd));
 983                 if (Cflag != 0) {
 984                         callback = dump_packet_and_trunc;
 985                         dumpinfo.WFileName = WFileName;
 986                         dumpinfo.pd = pd;
 987                         dumpinfo.p = p;
 988                         pcap_userdata = (u_char *)&dumpinfo;
 989                 } else {
 990                         callback = dump_packet;
 991                         pcap_userdata = (u_char *)p;
 992                 }
 993         } else {
 994                 type = pcap_datalink(pd);
 995                 printinfo.printer = lookup_printer(type);
 996                 if (printinfo.printer == NULL) {
 997                         gndo->ndo_dltname = pcap_datalink_val_to_name(type);
 998                         if (gndo->ndo_dltname != NULL)
 999                                 error("unsupported data link type %s",
1000                                       gndo->ndo_dltname);
1001                         else
1002                                 error("unsupported data link type %d", type);
1003                 }
1004                 callback = print_packet;
1005                 pcap_userdata = (u_char *)&printinfo;
1006         }
1007 #ifndef WIN32
1008         /*
1009          * We cannot do this earlier, because we want to be able to open
1010          * the file (if done) for writing before giving up permissions.
1011          */
1012         if (getuid() == 0 || geteuid() == 0) {
1013                 if (username || chroot_dir)
1014                         droproot(username, chroot_dir);
1015         }
1016 #endif /* WIN32 */
1017 #ifdef SIGINFO
1018         (void)setsignal(SIGINFO, requestinfo);
1019 #endif
1020
1021         if (vflag > 0 && WFileName) {
1022                 /*
1023                  * When capturing to a file, "-v" means tcpdump should,
1024                  * every 10 secodns, "v"erbosely report the number of
1025                  * packets captured.
1026                  */
1027 #ifdef USE_WIN32_MM_TIMER
1028                 /* call verbose_stats_dump() each 1000 +/-100msec */
1029                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1030                 setvbuf(stderr, NULL, _IONBF, 0);
1031 #elif defined(HAVE_ALARM)
1032                 (void)setsignal(SIGALRM, verbose_stats_dump);
1033                 alarm(1);
1034 #endif
1035         }
1036
1037 #ifndef WIN32
1038         if (RFileName == NULL) {
1039                 int dlt;
1040                 const char *dlt_name;
1041
1042                 if (!vflag && !WFileName) {
1043                         (void)fprintf(stderr,
1044                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1045                             program_name);
1046                 } else
1047                         (void)fprintf(stderr, "%s: ", program_name);
1048                 dlt = pcap_datalink(pd);
1049                 dlt_name = pcap_datalink_val_to_name(dlt);
1050                 if (dlt_name == NULL) {
1051                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1052                             device, dlt, snaplen);
1053                 } else {
1054                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1055                             device, dlt_name,
1056                             pcap_datalink_val_to_description(dlt), snaplen);
1057                 }
1058                 (void)fflush(stderr);
1059         }
1060 #endif /* WIN32 */
1061         status = pcap_loop(pd, cnt, callback, pcap_userdata);
1062         if (WFileName == NULL) {
1063                 /*
1064                  * We're printing packets.  Flush the printed output,
1065                  * so it doesn't get intermingled with error output.
1066                  */
1067                 if (status == -2) {
1068                         /*
1069                          * We got interrupted, so perhaps we didn't
1070                          * manage to finish a line we were printing.
1071                          * Print an extra newline, just in case.
1072                          */
1073                         putchar('\n');
1074                 }
1075                 (void)fflush(stdout);
1076         }
1077         if (status == -1) {
1078                 /*
1079                  * Error.  Report it.
1080                  */
1081                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1082                     program_name, pcap_geterr(pd));
1083         }
1084         if (RFileName == NULL) {
1085                 /*
1086                  * We're doing a live capture.  Report the capture
1087                  * statistics.
1088                  */
1089                 info(1);
1090         }
1091         pcap_close(pd);
1092         exit(status == -1 ? 1 : 0);
1093 }
1094
1095 /* make a clean exit on interrupts */
1096 static RETSIGTYPE
1097 cleanup(int signo _U_)
1098 {
1099 #ifdef USE_WIN32_MM_TIMER
1100         if (timer_id)
1101                 timeKillEvent(timer_id);
1102         timer_id = 0;
1103 #elif defined(HAVE_ALARM)
1104         alarm(0);
1105 #endif
1106
1107 #ifdef HAVE_PCAP_BREAKLOOP
1108         /*
1109          * We have "pcap_breakloop()"; use it, so that we do as little
1110          * as possible in the signal handler (it's probably not safe
1111          * to do anything with standard I/O streams in a signal handler -
1112          * the ANSI C standard doesn't say it is).
1113          */
1114         pcap_breakloop(pd);
1115 #else
1116         /*
1117          * We don't have "pcap_breakloop()"; this isn't safe, but
1118          * it's the best we can do.  Print the summary if we're
1119          * not reading from a savefile - i.e., if we're doing a
1120          * live capture - and exit.
1121          */
1122         if (pd != NULL && pcap_file(pd) == NULL) {
1123                 /*
1124                  * We got interrupted, so perhaps we didn't
1125                  * manage to finish a line we were printing.
1126                  * Print an extra newline, just in case.
1127                  */
1128                 putchar('\n');
1129                 (void)fflush(stdout);
1130                 info(1);
1131         }
1132         exit(0);
1133 #endif
1134 }
1135
1136 static void
1137 info(register int verbose)
1138 {
1139         struct pcap_stat stat;
1140
1141         if (pcap_stats(pd, &stat) < 0) {
1142                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1143                 return;
1144         }
1145
1146         if (!verbose)
1147                 fprintf(stderr, "%s: ", program_name);
1148
1149         (void)fprintf(stderr, "%u packets captured", packets_captured);
1150         if (!verbose)
1151                 fputs(", ", stderr);
1152         else
1153                 putc('\n', stderr);
1154         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1155         if (!verbose)
1156                 fputs(", ", stderr);
1157         else
1158                 putc('\n', stderr);
1159         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1160         infoprint = 0;
1161 }
1162
1163 static void
1164 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1165 {
1166         struct dump_info *dump_info;
1167         char *name;
1168
1169         ++packets_captured;
1170
1171         ++infodelay;
1172
1173         dump_info = (struct dump_info *)user;
1174
1175         /*
1176          * XXX - this won't prevent capture files from getting
1177          * larger than Cflag - the last packet written to the
1178          * file could put it over Cflag.
1179          */
1180         if (pcap_dump_ftell(dump_info->p) > Cflag) {
1181                 /*
1182                  * Close the current file and open a new one.
1183                  */
1184                 pcap_dump_close(dump_info->p);
1185                 Cflag_count++;
1186                 if (Wflag > 0) {
1187                         if (Cflag_count >= Wflag)
1188                                 Cflag_count = 0;
1189                 } else {
1190                         if (Cflag_count >= MAX_CFLAG)
1191                                 error("too many output files");
1192                 }
1193                 name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1);
1194                 if (name == NULL)
1195                         error("dump_packet_and_trunc: malloc");
1196                 MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
1197                 dump_info->p = pcap_dump_open(dump_info->pd, name);
1198                 free(name);
1199                 if (dump_info->p == NULL)
1200                         error("%s", pcap_geterr(pd));
1201         }
1202
1203         pcap_dump((u_char *)dump_info->p, h, sp);
1204 #ifdef HAVE_PCAP_DUMP_FLUSH
1205         if (Uflag)
1206                 pcap_dump_flush(dump_info->p);
1207 #endif
1208
1209         --infodelay;
1210         if (infoprint)
1211                 info(0);
1212 }
1213
1214 static void
1215 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1216 {
1217         ++packets_captured;
1218
1219         ++infodelay;
1220
1221         pcap_dump(user, h, sp);
1222 #ifdef HAVE_PCAP_DUMP_FLUSH
1223         if (Uflag)
1224                 pcap_dump_flush((pcap_dumper_t *)user);
1225 #endif
1226
1227         --infodelay;
1228         if (infoprint)
1229                 info(0);
1230 }
1231
1232 static void
1233 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1234 {
1235         struct print_info *print_info;
1236         u_int hdrlen;
1237
1238         ++packets_captured;
1239
1240         ++infodelay;
1241         ts_print(&h->ts);
1242
1243         print_info = (struct print_info *)user;
1244
1245         /*
1246          * Some printers want to check that they're not walking off the
1247          * end of the packet.
1248          * Rather than pass it all the way down, we set this global.
1249          */
1250         snapend = sp + h->caplen;
1251
1252         hdrlen = (*print_info->printer)(h, sp);
1253         if (Xflag) {
1254                 /*
1255                  * Print the raw packet data in hex and ASCII.
1256                  */
1257                 if (Xflag > 1) {
1258                         /*
1259                          * Include the link-layer header.
1260                          */
1261                         hex_and_ascii_print("\n\t", sp, h->caplen);
1262                 } else {
1263                         /*
1264                          * Don't include the link-layer header - and if
1265                          * we have nothing past the link-layer header,
1266                          * print nothing.
1267                          */
1268                         if (h->caplen > hdrlen)
1269                                 hex_and_ascii_print("\n\t", sp + hdrlen,
1270                                     h->caplen - hdrlen);
1271                 }
1272         } else if (xflag) {
1273                 /*
1274                  * Print the raw packet data in hex.
1275                  */
1276                 if (xflag > 1) {
1277                         /*
1278                          * Include the link-layer header.
1279                          */
1280                         hex_print("\n\t", sp, h->caplen);
1281                 } else {
1282                         /*
1283                          * Don't include the link-layer header - and if
1284                          * we have nothing past the link-layer header,
1285                          * print nothing.
1286                          */
1287                         if (h->caplen > hdrlen)
1288                                 hex_print("\n\t", sp + hdrlen,
1289                                     h->caplen - hdrlen);
1290                 }
1291         } else if (Aflag) {
1292                 /*
1293                  * Print the raw packet data in ASCII.
1294                  */
1295                 if (Aflag > 1) {
1296                         /*
1297                          * Include the link-layer header.
1298                          */
1299                         ascii_print(sp, h->caplen);
1300                 } else {
1301                         /*
1302                          * Don't include the link-layer header - and if
1303                          * we have nothing past the link-layer header,
1304                          * print nothing.
1305                          */
1306                         if (h->caplen > hdrlen)
1307                                 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1308                 }
1309         }
1310
1311         putchar('\n');
1312
1313         --infodelay;
1314         if (infoprint)
1315                 info(0);
1316 }
1317
1318 #ifdef WIN32
1319         /*
1320          * XXX - there should really be libpcap calls to get the version
1321          * number as a string (the string would be generated from #defines
1322          * at run time, so that it's not generated from string constants
1323          * in the library, as, on many UNIX systems, those constants would
1324          * be statically linked into the application executable image, and
1325          * would thus reflect the version of libpcap on the system on
1326          * which the application was *linked*, not the system on which it's
1327          * *running*.
1328          *
1329          * That routine should be documented, unlike the "version[]"
1330          * string, so that UNIX vendors providing their own libpcaps
1331          * don't omit it (as a couple of vendors have...).
1332          *
1333          * Packet.dll should perhaps also export a routine to return the
1334          * version number of the Packet.dll code, to supply the
1335          * "Wpcap_version" information on Windows.
1336          */
1337         char WDversion[]="current-cvs.tcpdump.org";
1338 #if !defined(HAVE_GENERATED_VERSION)
1339         char version[]="current-cvs.tcpdump.org";
1340 #endif
1341         char pcap_version[]="current-cvs.tcpdump.org";
1342         char Wpcap_version[]="3.1";
1343 #endif
1344
1345 /*
1346  * By default, print the specified data out in hex and ASCII.
1347  */
1348 static void
1349 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1350 {
1351         hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1352 }
1353
1354 void
1355 default_print(const u_char *bp, u_int length)
1356 {
1357         ndo_default_print(gndo, bp, length);
1358 }
1359
1360 #ifdef SIGINFO
1361 RETSIGTYPE requestinfo(int signo _U_)
1362 {
1363         if (infodelay)
1364                 ++infoprint;
1365         else
1366                 info(0);
1367 }
1368 #endif
1369
1370 /*
1371  * Called once each second in verbose mode while dumping to file
1372  */
1373 #ifdef USE_WIN32_MM_TIMER
1374 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1375                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1376 {
1377         struct pcap_stat stat;
1378
1379         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1380                 fprintf(stderr, "Got %u\r", packets_captured);
1381 }
1382 #elif defined(HAVE_ALARM)
1383 static void verbose_stats_dump(int sig _U_)
1384 {
1385         struct pcap_stat stat;
1386
1387         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1388                 fprintf(stderr, "Got %u\r", packets_captured);
1389         alarm(1);
1390 }
1391 #endif
1392
1393 static void
1394 usage(void)
1395 {
1396         extern char version[];
1397 #ifndef HAVE_PCAP_LIB_VERSION
1398 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1399         extern char pcap_version[];
1400 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1401         static char pcap_version[] = "unknown";
1402 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1403 #endif /* HAVE_PCAP_LIB_VERSION */
1404
1405 #ifdef 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 #else /* WIN32 */
1409         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1410 #endif /* WIN32 */
1411         (void)fprintf(stderr, "%s\n",pcap_lib_version());
1412 #else /* HAVE_PCAP_LIB_VERSION */
1413 #ifdef WIN32
1414         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1415         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1416 #else /* WIN32 */
1417         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1418         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1419 #endif /* WIN32 */
1420 #endif /* HAVE_PCAP_LIB_VERSION */
1421         (void)fprintf(stderr,
1422 "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
1423         (void)fprintf(stderr,
1424 "\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -M secret ]\n");
1425         (void)fprintf(stderr,
1426 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1427         (void)fprintf(stderr,
1428 "\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
1429         (void)fprintf(stderr,
1430 "\t\t[ expression ]\n");
1431         exit(1);
1432 }
1433
1434
1435
1436 /* VARARGS */
1437 static void
1438 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1439 {
1440         va_list ap;
1441
1442         (void)fprintf(stderr, "%s: ", program_name);
1443         va_start(ap, fmt);
1444         (void)vfprintf(stderr, fmt, ap);
1445         va_end(ap);
1446         if (*fmt) {
1447                 fmt += strlen(fmt);
1448                 if (fmt[-1] != '\n')
1449                         (void)fputc('\n', stderr);
1450         }
1451         exit(1);
1452         /* NOTREACHED */
1453 }
1454
1455 /* VARARGS */
1456 static void
1457 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1458 {
1459         va_list ap;
1460
1461         (void)fprintf(stderr, "%s: WARNING: ", program_name);
1462         va_start(ap, fmt);
1463         (void)vfprintf(stderr, fmt, ap);
1464         va_end(ap);
1465         if (*fmt) {
1466                 fmt += strlen(fmt);
1467                 if (fmt[-1] != '\n')
1468                         (void)fputc('\n', stderr);
1469         }
1470 }
1471