contrib/tcpdump-3.9/tcpdump.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Support for splitting captures into multiple files with a maximum
  22  * file size:
  23  *
  24  * Copyright (c) 2001
  25  *      Seth Webster <swebster@sst.ll.mit.edu>
  26  */
  27
  28 #ifndef lint
  29 static const char copyright[] _U_ =
  30     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
  31 The Regents of the University of California.  All rights reserved.\n";
  32 static const char rcsid[] _U_ =
  33     "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.253.2.13 2007/09/12 19:48:51 guy Exp $ (LBL)";
  34 #endif
  35
  36 /*
  37  * tcpdump - monitor tcp/ip traffic on an ethernet.
  38  *
  39  * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
  40  * Mercilessly hacked and occasionally improved since then via the
  41  * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
  42  */
  43
  44 #ifdef HAVE_CONFIG_H
  45 #include "config.h"
  46 #endif
  47
  48 #include <tcpdump-stdinc.h>
  49
  50 #ifdef WIN32
  51 #include "getopt.h"
  52 #include "w32_fzs.h"
  53 extern int strcasecmp (const char *__s1, const char *__s2);
  54 extern int SIZE_BUF;
  55 #define off_t long
  56 #define uint UINT
  57 #endif /* WIN32 */
  58
  59 #ifdef HAVE_SMI_H
  60 #include <smi.h>
  61 #endif
  62
  63 #include <pcap.h>
  64 #include <signal.h>
  65 #include <stdio.h>
  66 #include <stdlib.h>
  67 #include <string.h>
  68 #ifndef WIN32
  69 #include <pwd.h>
  70 #include <grp.h>
  71 #include <errno.h>
  72 #endif /* WIN32 */
  73
  74 #include "netdissect.h"
  75 #include "interface.h"
  76 #include "addrtoname.h"
  77 #include "machdep.h"
  78 #include "setsignal.h"
  79 #include "gmt2local.h"
  80 #include "pcap-missing.h"
  81
  82 netdissect_options Gndo;
  83 netdissect_options *gndo = &Gndo;
  84
  85 /*
  86  * Define the maximum number of files for the -C flag, and how many
  87  * characters can be added to a filename for the -C flag (which
  88  * should be enough to handle MAX_CFLAG - 1).
  89  */
  90 #define MAX_CFLAG       1000000
  91 #define MAX_CFLAG_CHARS 6
  92
  93 int dflag;                      /* print filter code */
  94 int Lflag;                      /* list available data link types and exit */
  95
  96 static int infodelay;
  97 static int infoprint;
  98
  99 char *program_name;
 100
 101 int32_t thiszone;               /* seconds offset from gmt to local time */
 102
 103 /* Forwards */
 104 static RETSIGTYPE cleanup(int);
 105 static void usage(void) __attribute__((noreturn));
 106 static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
 107
 108 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 109 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
 110 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 111 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 112 static void droproot(const char *, const char *);
 113 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
 114 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
 115
 116 #ifdef SIGINFO
 117 RETSIGTYPE requestinfo(int);
 118 #endif
 119
 120 #if defined(USE_WIN32_MM_TIMER)
 121   #include <MMsystem.h>
 122   static UINT timer_id;
 123   static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
 124 #elif defined(HAVE_ALARM)
 125   static void verbose_stats_dump(int sig);
 126 #endif
 127
 128 static void info(int);
 129 static u_int packets_captured;
 130
 131 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
 132
 133 struct printer {
 134         if_printer f;
 135         int type;
 136 };
 137
 138 static struct printer printers[] = {
 139         { arcnet_if_print,      DLT_ARCNET },
 140 #ifdef DLT_ARCNET_LINUX
 141         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 142 #endif
 143         { ether_if_print,       DLT_EN10MB },
 144         { token_if_print,       DLT_IEEE802 },
 145 #ifdef DLT_LANE8023
 146         { lane_if_print,        DLT_LANE8023 },
 147 #endif
 148 #ifdef DLT_CIP
 149         { cip_if_print,         DLT_CIP },
 150 #endif
 151 #ifdef DLT_ATM_CLIP
 152         { cip_if_print,         DLT_ATM_CLIP },
 153 #endif
 154         { sl_if_print,          DLT_SLIP },
 155 #ifdef DLT_SLIP_BSDOS
 156         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 157 #endif
 158         { ppp_if_print,         DLT_PPP },
 159 #ifdef DLT_PPP_WITHDIRECTION
 160         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 161 #endif
 162 #ifdef DLT_PPP_BSDOS
 163         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 164 #endif
 165         { fddi_if_print,        DLT_FDDI },
 166         { null_if_print,        DLT_NULL },
 167 #ifdef DLT_LOOP
 168         { null_if_print,        DLT_LOOP },
 169 #endif
 170         { raw_if_print,         DLT_RAW },
 171         { atm_if_print,         DLT_ATM_RFC1483 },
 172 #ifdef DLT_C_HDLC
 173         { chdlc_if_print,       DLT_C_HDLC },
 174 #endif
 175 #ifdef DLT_HDLC
 176         { chdlc_if_print,       DLT_HDLC },
 177 #endif
 178 #ifdef DLT_PPP_SERIAL
 179         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 180 #endif
 181 #ifdef DLT_PPP_ETHER
 182         { pppoe_if_print,       DLT_PPP_ETHER },
 183 #endif
 184 #ifdef DLT_LINUX_SLL
 185         { sll_if_print,         DLT_LINUX_SLL },
 186 #endif
 187 #ifdef DLT_IEEE802_11
 188         { ieee802_11_if_print,  DLT_IEEE802_11},
 189 #endif
 190 #ifdef DLT_LTALK
 191         { ltalk_if_print,       DLT_LTALK },
 192 #endif
 193 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
 194         { pflog_if_print,       DLT_PFLOG },
 195 #endif
 196 #ifdef DLT_FR
 197         { fr_if_print,          DLT_FR },
 198 #endif
 199 #ifdef DLT_FRELAY
 200         { fr_if_print,          DLT_FRELAY },
 201 #endif
 202 #ifdef DLT_SUNATM
 203         { sunatm_if_print,      DLT_SUNATM },
 204 #endif
 205 #ifdef DLT_IP_OVER_FC
 206         { ipfc_if_print,        DLT_IP_OVER_FC },
 207 #endif
 208 #ifdef DLT_PRISM_HEADER
 209         { prism_if_print,       DLT_PRISM_HEADER },
 210 #endif
 211 #ifdef DLT_IEEE802_11_RADIO
 212         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 213 #endif
 214 #ifdef DLT_ENC
 215         { enc_if_print,         DLT_ENC },
 216 #endif
 217 #ifdef DLT_SYMANTEC_FIREWALL
 218         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 219 #endif
 220 #ifdef DLT_APPLE_IP_OVER_IEEE1394
 221         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
 222 #endif
 223 #ifdef DLT_JUNIPER_ATM1
 224         { juniper_atm1_print,   DLT_JUNIPER_ATM1 },
 225 #endif
 226 #ifdef DLT_JUNIPER_ATM2
 227         { juniper_atm2_print,   DLT_JUNIPER_ATM2 },
 228 #endif
 229 #ifdef DLT_JUNIPER_MFR
 230         { juniper_mfr_print,    DLT_JUNIPER_MFR },
 231 #endif
 232 #ifdef DLT_JUNIPER_MLFR
 233         { juniper_mlfr_print,   DLT_JUNIPER_MLFR },
 234 #endif
 235 #ifdef DLT_JUNIPER_MLPPP
 236         { juniper_mlppp_print,  DLT_JUNIPER_MLPPP },
 237 #endif
 238 #ifdef DLT_JUNIPER_PPPOE
 239         { juniper_pppoe_print,  DLT_JUNIPER_PPPOE },
 240 #endif
 241 #ifdef DLT_JUNIPER_PPPOE_ATM
 242         { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
 243 #endif
 244 #ifdef DLT_JUNIPER_GGSN
 245         { juniper_ggsn_print,   DLT_JUNIPER_GGSN },
 246 #endif
 247 #ifdef DLT_JUNIPER_ES
 248         { juniper_es_print,     DLT_JUNIPER_ES },
 249 #endif
 250 #ifdef DLT_JUNIPER_MONITOR
 251         { juniper_monitor_print, DLT_JUNIPER_MONITOR },
 252 #endif
 253 #ifdef DLT_JUNIPER_SERVICES
 254         { juniper_services_print, DLT_JUNIPER_SERVICES },
 255 #endif
 256 #ifdef DLT_JUNIPER_ETHER
 257         { juniper_ether_print, DLT_JUNIPER_ETHER },
 258 #endif
 259 #ifdef DLT_JUNIPER_PPP
 260         { juniper_ppp_print, DLT_JUNIPER_PPP },
 261 #endif
 262 #ifdef DLT_JUNIPER_FRELAY
 263         { juniper_frelay_print, DLT_JUNIPER_FRELAY },
 264 #endif
 265 #ifdef DLT_JUNIPER_CHDLC
 266         { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
 267 #endif
 268 #ifdef DLT_MFR
 269         { mfr_if_print, DLT_MFR },
 270 #endif
 271         { NULL,                 0 },
 272 };
 273
 274 static if_printer
 275 lookup_printer(int type)
 276 {
 277         struct printer *p;
 278
 279         for (p = printers; p->f; ++p)
 280                 if (type == p->type)
 281                         return p->f;
 282
 283         return NULL;
 284         /* NOTREACHED */
 285 }
 286
 287 static pcap_t *pd;
 288
 289 extern int optind;
 290 extern int opterr;
 291 extern char *optarg;
 292
 293 struct print_info {
 294         if_printer printer;
 295 };
 296
 297 struct dump_info {
 298         char    *WFileName;
 299         pcap_t  *pd;
 300         pcap_dumper_t *p;
 301 };
 302
 303 static void
 304 show_dlts_and_exit(pcap_t *pd)
 305 {
 306         int n_dlts;
 307         int *dlts = 0;
 308         const char *dlt_name;
 309
 310         n_dlts = pcap_list_datalinks(pd, &dlts);
 311         if (n_dlts < 0)
 312                 error("%s", pcap_geterr(pd));
 313         else if (n_dlts == 0 || !dlts)
 314                 error("No data link types.");
 315
 316         (void) fprintf(stderr, "Data link types (use option -y to set):\n");
 317
 318         while (--n_dlts >= 0) {
 319                 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
 320                 if (dlt_name != NULL) {
 321                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
 322                             pcap_datalink_val_to_description(dlts[n_dlts]));
 323
 324                         /*
 325                          * OK, does tcpdump handle that type?
 326                          */
 327                         if (lookup_printer(dlts[n_dlts]) == NULL)
 328                                 (void) fprintf(stderr, " (not supported)");
 329                         putchar('\n');
 330                 } else {
 331                         (void) fprintf(stderr, "  DLT %d (not supported)\n",
 332                             dlts[n_dlts]);
 333                 }
 334         }
 335         free(dlts);
 336         exit(0);
 337 }
 338
 339 /*
 340  * Set up flags that might or might not be supported depending on the
 341  * version of libpcap we're using.
 342  */
 343 #ifdef WIN32
 344 #define B_FLAG          "B:"
 345 #define B_FLAG_USAGE    " [ -B size ]"
 346 #else /* WIN32 */
 347 #define B_FLAG
 348 #define B_FLAG_USAGE
 349 #endif /* WIN32 */
 350
 351 #ifdef HAVE_PCAP_FINDALLDEVS
 352 #ifndef HAVE_PCAP_IF_T
 353 #undef HAVE_PCAP_FINDALLDEVS
 354 #endif
 355 #endif
 356
 357 #ifdef HAVE_PCAP_FINDALLDEVS
 358 #define D_FLAG  "D"
 359 #else
 360 #define D_FLAG
 361 #endif
 362
 363 #ifdef HAVE_PCAP_DUMP_FLUSH
 364 #define U_FLAG  "U"
 365 #else
 366 #define U_FLAG
 367 #endif
 368
 369 #ifndef WIN32
 370 /* Drop root privileges and chroot if necessary */
 371 static void
 372 droproot(const char *username, const char *chroot_dir)
 373 {
 374         struct passwd *pw = NULL;
 375
 376         if (chroot_dir && !username) {
 377                 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
 378                 exit(1);
 379         }
 380
 381         pw = getpwnam(username);
 382         if (pw) {
 383                 if (chroot_dir) {
 384                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
 385                                 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
 386                                     chroot_dir, pcap_strerror(errno));
 387                                 exit(1);
 388                         }
 389                 }
 390                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
 391                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
 392                         fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
 393                             username,
 394                             (unsigned long)pw->pw_uid,
 395                             (unsigned long)pw->pw_gid,
 396                             pcap_strerror(errno));
 397                         exit(1);
 398                 }
 399         }
 400         else {
 401                 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
 402                     username);
 403                 exit(1);
 404         }
 405 }
 406 #endif /* WIN32 */
 407
 408 static int
 409 getWflagChars(int x)
 410 {
 411         int c = 0;
 412
 413         x -= 1;
 414         while (x > 0) {
 415                 c += 1;
 416                 x /= 10;
 417         }
 418
 419         return c;
 420 }
 421
 422
 423 static void
 424 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
 425 {
 426         if (cnt == 0 && max_chars == 0)
 427                 strcpy(buffer, orig_name);
 428         else
 429                 sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
 430 }
 431
 432 static int tcpdump_printf(netdissect_options *ndo _U_,
 433                           const char *fmt, ...)
 434 {
 435
 436   va_list args;
 437   int ret;
 438
 439   va_start(args, fmt);
 440   ret=vfprintf(stdout, fmt, args);
 441   va_end(args);
 442
 443   return ret;
 444 }
 445
 446 int
 447 main(int argc, char **argv)
 448 {
 449         register int cnt, op, i;
 450         bpf_u_int32 localnet, netmask;
 451         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
 452         pcap_handler callback;
 453         int type;
 454         struct bpf_program fcode;
 455 #ifndef WIN32
 456         RETSIGTYPE (*oldhandler)(int);
 457 #endif
 458         struct print_info printinfo;
 459         struct dump_info dumpinfo;
 460         u_char *pcap_userdata;
 461         char ebuf[PCAP_ERRBUF_SIZE];
 462         char *username = NULL;
 463         char *chroot_dir = NULL;
 464 #ifdef HAVE_PCAP_FINDALLDEVS
 465         pcap_if_t *devpointer;
 466         int devnum;
 467 #endif
 468         int status;
 469 #ifdef WIN32
 470         u_int UserBufferSize = 1000000;
 471         if(wsockinit() != 0) return 1;
 472 #endif /* WIN32 */
 473
 474         gndo->ndo_Oflag=1;
 475         gndo->ndo_Rflag=1;
 476         gndo->ndo_dlt=-1;
 477         gndo->ndo_default_print=ndo_default_print;
 478         gndo->ndo_printf=tcpdump_printf;
 479         gndo->ndo_error=ndo_error;
 480         gndo->ndo_warning=ndo_warning;
 481         gndo->ndo_snaplen = DEFAULT_SNAPLEN;
 482
 483         cnt = -1;
 484         device = NULL;
 485         infile = NULL;
 486         RFileName = NULL;
 487         WFileName = NULL;
 488         if ((cp = strrchr(argv[0], '/')) != NULL)
 489                 program_name = cp + 1;
 490         else
 491                 program_name = argv[0];
 492
 493         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 494                 error("%s", ebuf);
 495
 496 #ifdef LIBSMI
 497         smiInit("tcpdump");
 498 #endif
 499
 500         opterr = 0;
 501         while (
 502             (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)
 503                 switch (op) {
 504
 505                 case 'a':
 506                         /* compatibility for old -a */
 507                         break;
 508
 509                 case 'A':
 510                         ++Aflag;
 511                         break;
 512
 513 #ifdef WIN32
 514                 case 'B':
 515                         UserBufferSize = atoi(optarg)*1024;
 516                         if (UserBufferSize < 0)
 517                                 error("invalid packet buffer size %s", optarg);
 518                         break;
 519 #endif /* WIN32 */
 520
 521                 case 'c':
 522                         cnt = atoi(optarg);
 523                         if (cnt <= 0)
 524                                 error("invalid packet count %s", optarg);
 525                         break;
 526
 527                 case 'C':
 528                         Cflag = atoi(optarg) * 1000000;
 529                         if (Cflag < 0)
 530                                 error("invalid file size %s", optarg);
 531                         break;
 532
 533                 case 'd':
 534                         ++dflag;
 535                         break;
 536
 537 #ifdef HAVE_PCAP_FINDALLDEVS
 538                 case 'D':
 539                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 540                                 error("%s", ebuf);
 541                         else {
 542                                 for (i = 0; devpointer != 0; i++) {
 543                                         printf("%d.%s", i+1, devpointer->name);
 544                                         if (devpointer->description != NULL)
 545                                                 printf(" (%s)", devpointer->description);
 546                                         printf("\n");
 547                                         devpointer = devpointer->next;
 548                                 }
 549                         }
 550                         return 0;
 551 #endif /* HAVE_PCAP_FINDALLDEVS */
 552
 553                 case 'L':
 554                         Lflag++;
 555                         break;
 556
 557                 case 'e':
 558                         ++eflag;
 559                         break;
 560
 561                 case 'E':
 562 #ifndef HAVE_LIBCRYPTO
 563                         warning("crypto code not compiled in");
 564 #endif
 565                         gndo->ndo_espsecret = optarg;
 566                         break;
 567
 568                 case 'f':
 569                         ++fflag;
 570                         break;
 571
 572                 case 'F':
 573                         infile = optarg;
 574                         break;
 575
 576                 case 'i':
 577                         if (optarg[0] == '0' && optarg[1] == 0)
 578                                 error("Invalid adapter index");
 579
 580 #ifdef HAVE_PCAP_FINDALLDEVS
 581                         /*
 582                          * If the argument is a number, treat it as
 583                          * an index into the list of adapters, as
 584                          * printed by "tcpdump -D".
 585                          *
 586                          * This should be OK on UNIX systems, as interfaces
 587                          * shouldn't have names that begin with digits.
 588                          * It can be useful on Windows, where more than
 589                          * one interface can have the same name.
 590                          */
 591                         if ((devnum = atoi(optarg)) != 0) {
 592                                 if (devnum < 0)
 593                                         error("Invalid adapter index");
 594
 595                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 596                                         error("%s", ebuf);
 597                                 else {
 598                                         for (i = 0; i < devnum-1; i++){
 599                                                 devpointer = devpointer->next;
 600                                                 if (devpointer == NULL)
 601                                                         error("Invalid adapter index");
 602                                         }
 603                                 }
 604                                 device = devpointer->name;
 605                                 break;
 606                         }
 607 #endif /* HAVE_PCAP_FINDALLDEVS */
 608                         device = optarg;
 609                         break;
 610
 611                 case 'l':
 612 #ifdef WIN32
 613                         /*
 614                          * _IOLBF is the same as _IOFBF in Microsoft's C
 615                          * libraries; the only alternative they offer
 616                          * is _IONBF.
 617                          *
 618                          * XXX - this should really be checking for MSVC++,
 619                          * not WIN32, if, for example, MinGW has its own
 620                          * C library that is more UNIX-compatible.
 621                          */
 622                         setvbuf(stdout, NULL, _IONBF, 0);
 623 #else /* WIN32 */
 624 #ifdef HAVE_SETLINEBUF
 625                         setlinebuf(stdout);
 626 #else
 627                         setvbuf(stdout, NULL, _IOLBF, 0);
 628 #endif
 629 #endif /* WIN32 */
 630                         break;
 631
 632                 case 'n':
 633                         ++nflag;
 634                         break;
 635
 636                 case 'N':
 637                         ++Nflag;
 638                         break;
 639
 640                 case 'm':
 641 #ifdef LIBSMI
 642                         if (smiLoadModule(optarg) == 0) {
 643                                 error("could not load MIB module %s", optarg);
 644                         }
 645                         sflag = 1;
 646 #else
 647                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 648                                       program_name, optarg);
 649                         (void)fprintf(stderr, "(no libsmi support)\n");
 650 #endif
 651                         break;
 652
 653                 case 'M':
 654                         /* TCP-MD5 shared secret */
 655 #ifndef HAVE_LIBCRYPTO
 656                         warning("crypto code not compiled in");
 657 #endif
 658                         tcpmd5secret = optarg;
 659                         break;
 660
 661                 case 'O':
 662                         Oflag = 0;
 663                         break;
 664
 665                 case 'p':
 666                         ++pflag;
 667                         break;
 668
 669                 case 'q':
 670                         ++qflag;
 671                         ++suppress_default_print;
 672                         break;
 673
 674                 case 'r':
 675                         RFileName = optarg;
 676                         break;
 677
 678                 case 'R':
 679                         Rflag = 0;
 680                         break;
 681
 682                 case 's': {
 683                         char *end;
 684
 685                         snaplen = strtol(optarg, &end, 0);
 686                         if (optarg == end || *end != '\0'
 687                             || snaplen < 0 || snaplen > 65535)
 688                                 error("invalid snaplen %s", optarg);
 689                         else if (snaplen == 0)
 690                                 snaplen = 65535;
 691                         break;
 692                 }
 693
 694                 case 'S':
 695                         ++Sflag;
 696                         break;
 697
 698                 case 't':
 699                         ++tflag;
 700                         break;
 701
 702                 case 'T':
 703                         if (strcasecmp(optarg, "vat") == 0)
 704                                 packettype = PT_VAT;
 705                         else if (strcasecmp(optarg, "wb") == 0)
 706                                 packettype = PT_WB;
 707                         else if (strcasecmp(optarg, "rpc") == 0)
 708                                 packettype = PT_RPC;
 709                         else if (strcasecmp(optarg, "rtp") == 0)
 710                                 packettype = PT_RTP;
 711                         else if (strcasecmp(optarg, "rtcp") == 0)
 712                                 packettype = PT_RTCP;
 713                         else if (strcasecmp(optarg, "snmp") == 0)
 714                                 packettype = PT_SNMP;
 715                         else if (strcasecmp(optarg, "cnfp") == 0)
 716                                 packettype = PT_CNFP;
 717                         else if (strcasecmp(optarg, "tftp") == 0)
 718                                 packettype = PT_TFTP;
 719                         else if (strcasecmp(optarg, "aodv") == 0)
 720                                 packettype = PT_AODV;
 721                         else
 722                                 error("unknown packet type `%s'", optarg);
 723                         break;
 724
 725                 case 'u':
 726                         ++uflag;
 727                         break;
 728
 729 #ifdef HAVE_PCAP_DUMP_FLUSH
 730                 case 'U':
 731                         ++Uflag;
 732                         break;
 733 #endif
 734
 735                 case 'v':
 736                         ++vflag;
 737                         break;
 738
 739                 case 'w':
 740                         WFileName = optarg;
 741                         break;
 742
 743                 case 'W':
 744                         Wflag = atoi(optarg);
 745                         if (Wflag < 0)
 746                                 error("invalid number of output files %s", optarg);
 747                         WflagChars = getWflagChars(Wflag);
 748                         break;
 749
 750                 case 'x':
 751                         ++xflag;
 752                         ++suppress_default_print;
 753                         break;
 754
 755                 case 'X':
 756                         ++Xflag;
 757                         ++suppress_default_print;
 758                         break;
 759
 760                 case 'y':
 761                         gndo->ndo_dltname = optarg;
 762                         gndo->ndo_dlt =
 763                           pcap_datalink_name_to_val(gndo->ndo_dltname);
 764                         if (gndo->ndo_dlt < 0)
 765                                 error("invalid data link type %s", gndo->ndo_dltname);
 766                         break;
 767
 768 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 769                 case 'Y':
 770                         {
 771                         /* Undocumented flag */
 772 #ifdef HAVE_PCAP_DEBUG
 773                         extern int pcap_debug;
 774                         pcap_debug = 1;
 775 #else
 776                         extern int yydebug;
 777                         yydebug = 1;
 778 #endif
 779                         }
 780                         break;
 781 #endif
 782                 case 'Z':
 783                         if (optarg) {
 784                                 username = strdup(optarg);
 785                         }
 786                         else {
 787                                 usage();
 788                                 /* NOTREACHED */
 789                         }
 790                         break;
 791
 792                 default:
 793                         usage();
 794                         /* NOTREACHED */
 795                 }
 796
 797         switch (tflag) {
 798
 799         case 0: /* Default */
 800         case 4: /* Default + Date*/
 801                 thiszone = gmt2local(0);
 802                 break;
 803
 804         case 1: /* No time stamp */
 805         case 2: /* Unix timeval style */
 806         case 3: /* Microseconds since previous packet */
 807                 break;
 808
 809         default: /* Not supported */
 810                 error("only -t, -tt, -ttt, and -tttt are supported");
 811                 break;
 812         }
 813
 814 #ifdef WITH_CHROOT
 815         /* if run as root, prepare for chrooting */
 816         if (getuid() == 0 || geteuid() == 0) {
 817                 /* future extensibility for cmd-line arguments */
 818                 if (!chroot_dir)
 819                         chroot_dir = WITH_CHROOT;
 820         }
 821 #endif
 822
 823 #ifdef WITH_USER
 824         /* if run as root, prepare for dropping root privileges */
 825         if (getuid() == 0 || geteuid() == 0) {
 826                 /* Run with '-Z root' to restore old behaviour */
 827                 if (!username)
 828                         username = WITH_USER;
 829         }
 830 #endif
 831
 832         if (RFileName != NULL) {
 833                 int dlt;
 834                 const char *dlt_name;
 835
 836 #ifndef WIN32
 837                 /*
 838                  * We don't need network access, so relinquish any set-UID
 839                  * or set-GID privileges we have (if any).
 840                  *
 841                  * We do *not* want set-UID privileges when opening a
 842                  * trace file, as that might let the user read other
 843                  * people's trace files (especially if we're set-UID
 844                  * root).
 845                  */
 846                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
 847                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 848 #endif /* WIN32 */
 849                 pd = pcap_open_offline(RFileName, ebuf);
 850                 if (pd == NULL)
 851                         error("%s", ebuf);
 852                 dlt = pcap_datalink(pd);
 853                 dlt_name = pcap_datalink_val_to_name(dlt);
 854                 if (dlt_name == NULL) {
 855                         fprintf(stderr, "reading from file %s, link-type %u\n",
 856                             RFileName, dlt);
 857                 } else {
 858                         fprintf(stderr,
 859                             "reading from file %s, link-type %s (%s)\n",
 860                             RFileName, dlt_name,
 861                             pcap_datalink_val_to_description(dlt));
 862                 }
 863                 localnet = 0;
 864                 netmask = 0;
 865                 if (fflag != 0)
 866                         error("-f and -r options are incompatible");
 867         } else {
 868                 if (device == NULL) {
 869                         device = pcap_lookupdev(ebuf);
 870                         if (device == NULL)
 871                                 error("%s", ebuf);
 872                 }
 873 #ifdef WIN32
 874                 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
 875                 {                                               //a Unicode string has a \0 as second byte (so strlen() is 1)
 876                         fprintf(stderr, "%s: listening on %ws\n", program_name, device);
 877                 }
 878                 else
 879                 {
 880                         fprintf(stderr, "%s: listening on %s\n", program_name, device);
 881                 }
 882
 883                 fflush(stderr);
 884 #endif /* WIN32 */
 885                 *ebuf = '\0';
 886                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
 887                 if (pd == NULL)
 888                         error("%s", ebuf);
 889                 else if (*ebuf)
 890                         warning("%s", ebuf);
 891                 /*
 892                  * Let user own process after socket has been opened.
 893                  */
 894 #ifndef WIN32
 895                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
 896                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 897 #endif /* WIN32 */
 898 #ifdef WIN32
 899                 if(UserBufferSize != 1000000)
 900                         if(pcap_setbuff(pd, UserBufferSize)==-1){
 901                                 error("%s", pcap_geterr(pd));
 902                         }
 903 #endif /* WIN32 */
 904                 if (Lflag)
 905                         show_dlts_and_exit(pd);
 906                 if (gndo->ndo_dlt >= 0) {
 907 #ifdef HAVE_PCAP_SET_DATALINK
 908                         if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
 909                                 error("%s", pcap_geterr(pd));
 910 #else
 911                         /*
 912                          * We don't actually support changing the
 913                          * data link type, so we only let them
 914                          * set it to what it already is.
 915                          */
 916                         if (gndo->ndo_dlt != pcap_datalink(pd)) {
 917                                 error("%s is not one of the DLTs supported by this device\n",
 918                                       gndo->ndo_dltname);
 919                         }
 920 #endif
 921                         (void)fprintf(stderr, "%s: data link type %s\n",
 922                                       program_name, gndo->ndo_dltname);
 923                         (void)fflush(stderr);
 924                 }
 925                 i = pcap_snapshot(pd);
 926                 if (snaplen < i) {
 927                         warning("snaplen raised from %d to %d", snaplen, i);
 928                         snaplen = i;
 929                 }
 930                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
 931                         localnet = 0;
 932                         netmask = 0;
 933                         warning("%s", ebuf);
 934                 }
 935         }
 936         if (infile)
 937                 cmdbuf = read_infile(infile);
 938         else
 939                 cmdbuf = copy_argv(&argv[optind]);
 940
 941         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 942                 error("%s", pcap_geterr(pd));
 943         if (dflag) {
 944                 bpf_dump(&fcode, dflag);
 945                 pcap_close(pd);
 946                 exit(0);
 947         }
 948         init_addrtoname(localnet, netmask);
 949
 950 #ifndef WIN32
 951         (void)setsignal(SIGPIPE, cleanup);
 952 #endif /* WIN32 */
 953         (void)setsignal(SIGTERM, cleanup);
 954         (void)setsignal(SIGINT, cleanup);
 955         /* Cooperate with nohup(1) */
 956 #ifndef WIN32
 957         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
 958                 (void)setsignal(SIGHUP, oldhandler);
 959 #endif /* WIN32 */
 960
 961         if (pcap_setfilter(pd, &fcode) < 0)
 962                 error("%s", pcap_geterr(pd));
 963         if (WFileName) {
 964                 pcap_dumper_t *p;
 965
 966                 WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1);
 967                 if (WFileNameAlt == NULL)
 968                         error("malloc of WFileNameAlt");
 969                 MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
 970                 p = pcap_dump_open(pd, WFileNameAlt);
 971                 if (p == NULL)
 972                         error("%s", pcap_geterr(pd));
 973                 if (Cflag != 0) {
 974                         callback = dump_packet_and_trunc;
 975                         dumpinfo.WFileName = WFileName;
 976                         dumpinfo.pd = pd;
 977                         dumpinfo.p = p;
 978                         pcap_userdata = (u_char *)&dumpinfo;
 979                 } else {
 980                         callback = dump_packet;
 981                         pcap_userdata = (u_char *)p;
 982                 }
 983         } else {
 984                 type = pcap_datalink(pd);
 985                 printinfo.printer = lookup_printer(type);
 986                 if (printinfo.printer == NULL) {
 987                         gndo->ndo_dltname = pcap_datalink_val_to_name(type);
 988                         if (gndo->ndo_dltname != NULL)
 989                                 error("unsupported data link type %s",
 990                                       gndo->ndo_dltname);
 991                         else
 992                                 error("unsupported data link type %d", type);
 993                 }
 994                 callback = print_packet;
 995                 pcap_userdata = (u_char *)&printinfo;
 996         }
 997 #ifndef WIN32
 998         /*
 999          * We cannot do this earlier, because we want to be able to open
1000          * the file (if done) for writing before giving up permissions.
1001          */
1002         if (getuid() == 0 || geteuid() == 0) {
1003                 if (username || chroot_dir)
1004                         droproot(username, chroot_dir);
1005         }
1006 #endif /* WIN32 */
1007 #ifdef SIGINFO
1008         (void)setsignal(SIGINFO, requestinfo);
1009 #endif
1010
1011         if (vflag > 0 && WFileName) {
1012                 /*
1013                  * When capturing to a file, "-v" means tcpdump should,
1014                  * every 10 secodns, "v"erbosely report the number of
1015                  * packets captured.
1016                  */
1017 #ifdef USE_WIN32_MM_TIMER
1018                 /* call verbose_stats_dump() each 1000 +/-100msec */
1019                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1020                 setvbuf(stderr, NULL, _IONBF, 0);
1021 #elif defined(HAVE_ALARM)
1022                 (void)setsignal(SIGALRM, verbose_stats_dump);
1023                 alarm(1);
1024 #endif
1025         }
1026
1027 #ifndef WIN32
1028         if (RFileName == NULL) {
1029                 int dlt;
1030                 const char *dlt_name;
1031
1032                 if (!vflag && !WFileName) {
1033                         (void)fprintf(stderr,
1034                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1035                             program_name);
1036                 } else
1037                         (void)fprintf(stderr, "%s: ", program_name);
1038                 dlt = pcap_datalink(pd);
1039                 dlt_name = pcap_datalink_val_to_name(dlt);
1040                 if (dlt_name == NULL) {
1041                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1042                             device, dlt, snaplen);
1043                 } else {
1044                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1045                             device, dlt_name,
1046                             pcap_datalink_val_to_description(dlt), snaplen);
1047                 }
1048                 (void)fflush(stderr);
1049         }
1050 #endif /* WIN32 */
1051         status = pcap_loop(pd, cnt, callback, pcap_userdata);
1052         if (WFileName == NULL) {
1053                 /*
1054                  * We're printing packets.  Flush the printed output,
1055                  * so it doesn't get intermingled with error output.
1056                  */
1057                 if (status == -2) {
1058                         /*
1059                          * We got interrupted, so perhaps we didn't
1060                          * manage to finish a line we were printing.
1061                          * Print an extra newline, just in case.
1062                          */
1063                         putchar('\n');
1064                 }
1065                 (void)fflush(stdout);
1066         }
1067         if (status == -1) {
1068                 /*
1069                  * Error.  Report it.
1070                  */
1071                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1072                     program_name, pcap_geterr(pd));
1073         }
1074         if (RFileName == NULL) {
1075                 /*
1076                  * We're doing a live capture.  Report the capture
1077                  * statistics.
1078                  */
1079                 info(1);
1080         }
1081         pcap_close(pd);
1082         exit(status == -1 ? 1 : 0);
1083 }
1084
1085 /* make a clean exit on interrupts */
1086 static RETSIGTYPE
1087 cleanup(int signo _U_)
1088 {
1089 #ifdef USE_WIN32_MM_TIMER
1090         if (timer_id)
1091                 timeKillEvent(timer_id);
1092         timer_id = 0;
1093 #elif defined(HAVE_ALARM)
1094         alarm(0);
1095 #endif
1096
1097 #ifdef HAVE_PCAP_BREAKLOOP
1098         /*
1099          * We have "pcap_breakloop()"; use it, so that we do as little
1100          * as possible in the signal handler (it's probably not safe
1101          * to do anything with standard I/O streams in a signal handler -
1102          * the ANSI C standard doesn't say it is).
1103          */
1104         pcap_breakloop(pd);
1105 #else
1106         /*
1107          * We don't have "pcap_breakloop()"; this isn't safe, but
1108          * it's the best we can do.  Print the summary if we're
1109          * not reading from a savefile - i.e., if we're doing a
1110          * live capture - and exit.
1111          */
1112         if (pd != NULL && pcap_file(pd) == NULL) {
1113                 /*
1114                  * We got interrupted, so perhaps we didn't
1115                  * manage to finish a line we were printing.
1116                  * Print an extra newline, just in case.
1117                  */
1118                 putchar('\n');
1119                 (void)fflush(stdout);
1120                 info(1);
1121         }
1122         exit(0);
1123 #endif
1124 }
1125
1126 static void
1127 info(register int verbose)
1128 {
1129         struct pcap_stat stat;
1130
1131         if (pcap_stats(pd, &stat) < 0) {
1132                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1133                 return;
1134         }
1135
1136         if (!verbose)
1137                 fprintf(stderr, "%s: ", program_name);
1138
1139         (void)fprintf(stderr, "%u packets captured", packets_captured);
1140         if (!verbose)
1141                 fputs(", ", stderr);
1142         else
1143                 putc('\n', stderr);
1144         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1145         if (!verbose)
1146                 fputs(", ", stderr);
1147         else
1148                 putc('\n', stderr);
1149         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1150         infoprint = 0;
1151 }
1152
1153 static void
1154 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1155 {
1156         struct dump_info *dump_info;
1157         char *name;
1158
1159         ++packets_captured;
1160
1161         ++infodelay;
1162
1163         dump_info = (struct dump_info *)user;
1164
1165         /*
1166          * XXX - this won't prevent capture files from getting
1167          * larger than Cflag - the last packet written to the
1168          * file could put it over Cflag.
1169          */
1170         if (pcap_dump_ftell(dump_info->p) > Cflag) {
1171                 /*
1172                  * Close the current file and open a new one.
1173                  */
1174                 pcap_dump_close(dump_info->p);
1175                 Cflag_count++;
1176                 if (Wflag > 0) {
1177                         if (Cflag_count >= Wflag)
1178                                 Cflag_count = 0;
1179                 } else {
1180                         if (Cflag_count >= MAX_CFLAG)
1181                                 error("too many output files");
1182                 }
1183                 name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1);
1184                 if (name == NULL)
1185                         error("dump_packet_and_trunc: malloc");
1186                 MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
1187                 dump_info->p = pcap_dump_open(dump_info->pd, name);
1188                 free(name);
1189                 if (dump_info->p == NULL)
1190                         error("%s", pcap_geterr(pd));
1191         }
1192
1193         pcap_dump((u_char *)dump_info->p, h, sp);
1194 #ifdef HAVE_PCAP_DUMP_FLUSH
1195         if (Uflag)
1196                 pcap_dump_flush(dump_info->p);
1197 #endif
1198
1199         --infodelay;
1200         if (infoprint)
1201                 info(0);
1202 }
1203
1204 static void
1205 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1206 {
1207         ++packets_captured;
1208
1209         ++infodelay;
1210
1211         pcap_dump(user, h, sp);
1212 #ifdef HAVE_PCAP_DUMP_FLUSH
1213         if (Uflag)
1214                 pcap_dump_flush((pcap_dumper_t *)user);
1215 #endif
1216
1217         --infodelay;
1218         if (infoprint)
1219                 info(0);
1220 }
1221
1222 static void
1223 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1224 {
1225         struct print_info *print_info;
1226         u_int hdrlen;
1227
1228         ++packets_captured;
1229
1230         ++infodelay;
1231         ts_print(&h->ts);
1232
1233         print_info = (struct print_info *)user;
1234
1235         /*
1236          * Some printers want to check that they're not walking off the
1237          * end of the packet.
1238          * Rather than pass it all the way down, we set this global.
1239          */
1240         snapend = sp + h->caplen;
1241
1242         hdrlen = (*print_info->printer)(h, sp);
1243         if (Xflag) {
1244                 /*
1245                  * Print the raw packet data in hex and ASCII.
1246                  */
1247                 if (Xflag > 1) {
1248                         /*
1249                          * Include the link-layer header.
1250                          */
1251                         hex_and_ascii_print("\n\t", sp, h->caplen);
1252                 } else {
1253                         /*
1254                          * Don't include the link-layer header - and if
1255                          * we have nothing past the link-layer header,
1256                          * print nothing.
1257                          */
1258                         if (h->caplen > hdrlen)
1259                                 hex_and_ascii_print("\n\t", sp + hdrlen,
1260                                     h->caplen - hdrlen);
1261                 }
1262         } else if (xflag) {
1263                 /*
1264                  * Print the raw packet data in hex.
1265                  */
1266                 if (xflag > 1) {
1267                         /*
1268                          * Include the link-layer header.
1269                          */
1270                         hex_print("\n\t", sp, h->caplen);
1271                 } else {
1272                         /*
1273                          * Don't include the link-layer header - and if
1274                          * we have nothing past the link-layer header,
1275                          * print nothing.
1276                          */
1277                         if (h->caplen > hdrlen)
1278                                 hex_print("\n\t", sp + hdrlen,
1279                                     h->caplen - hdrlen);
1280                 }
1281         } else if (Aflag) {
1282                 /*
1283                  * Print the raw packet data in ASCII.
1284                  */
1285                 if (Aflag > 1) {
1286                         /*
1287                          * Include the link-layer header.
1288                          */
1289                         ascii_print(sp, h->caplen);
1290                 } else {
1291                         /*
1292                          * Don't include the link-layer header - and if
1293                          * we have nothing past the link-layer header,
1294                          * print nothing.
1295                          */
1296                         if (h->caplen > hdrlen)
1297                                 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1298                 }
1299         }
1300
1301         putchar('\n');
1302
1303         --infodelay;
1304         if (infoprint)
1305                 info(0);
1306 }
1307
1308 #ifdef WIN32
1309         /*
1310          * XXX - there should really be libpcap calls to get the version
1311          * number as a string (the string would be generated from #defines
1312          * at run time, so that it's not generated from string constants
1313          * in the library, as, on many UNIX systems, those constants would
1314          * be statically linked into the application executable image, and
1315          * would thus reflect the version of libpcap on the system on
1316          * which the application was *linked*, not the system on which it's
1317          * *running*.
1318          *
1319          * That routine should be documented, unlike the "version[]"
1320          * string, so that UNIX vendors providing their own libpcaps
1321          * don't omit it (as a couple of vendors have...).
1322          *
1323          * Packet.dll should perhaps also export a routine to return the
1324          * version number of the Packet.dll code, to supply the
1325          * "Wpcap_version" information on Windows.
1326          */
1327         char WDversion[]="current-cvs.tcpdump.org";
1328 #if !defined(HAVE_GENERATED_VERSION)
1329         char version[]="current-cvs.tcpdump.org";
1330 #endif
1331         char pcap_version[]="current-cvs.tcpdump.org";
1332         char Wpcap_version[]="3.1";
1333 #endif
1334
1335 /*
1336  * By default, print the specified data out in hex and ASCII.
1337  */
1338 static void
1339 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1340 {
1341         hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1342 }
1343
1344 void
1345 default_print(const u_char *bp, u_int length)
1346 {
1347         ndo_default_print(gndo, bp, length);
1348 }
1349
1350 #ifdef SIGINFO
1351 RETSIGTYPE requestinfo(int signo _U_)
1352 {
1353         if (infodelay)
1354                 ++infoprint;
1355         else
1356                 info(0);
1357 }
1358 #endif
1359
1360 /*
1361  * Called once each second in verbose mode while dumping to file
1362  */
1363 #ifdef USE_WIN32_MM_TIMER
1364 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1365                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1366 {
1367         struct pcap_stat stat;
1368
1369         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1370                 fprintf(stderr, "Got %u\r", packets_captured);
1371 }
1372 #elif defined(HAVE_ALARM)
1373 static void verbose_stats_dump(int sig _U_)
1374 {
1375         struct pcap_stat stat;
1376
1377         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1378                 fprintf(stderr, "Got %u\r", packets_captured);
1379         alarm(1);
1380 }
1381 #endif
1382
1383 static void
1384 usage(void)
1385 {
1386         extern char version[];
1387 #ifndef HAVE_PCAP_LIB_VERSION
1388 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1389         extern char pcap_version[];
1390 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1391         static char pcap_version[] = "unknown";
1392 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1393 #endif /* HAVE_PCAP_LIB_VERSION */
1394
1395 #ifdef HAVE_PCAP_LIB_VERSION
1396 #ifdef WIN32
1397         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1398 #else /* WIN32 */
1399         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1400 #endif /* WIN32 */
1401         (void)fprintf(stderr, "%s\n",pcap_lib_version());
1402 #else /* HAVE_PCAP_LIB_VERSION */
1403 #ifdef WIN32
1404         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1405         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1406 #else /* WIN32 */
1407         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1408         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1409 #endif /* WIN32 */
1410 #endif /* HAVE_PCAP_LIB_VERSION */
1411         (void)fprintf(stderr,
1412 "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
1413         (void)fprintf(stderr,
1414 "\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -M secret ]\n");
1415         (void)fprintf(stderr,
1416 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1417         (void)fprintf(stderr,
1418 "\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
1419         (void)fprintf(stderr,
1420 "\t\t[ expression ]\n");
1421         exit(1);
1422 }
1423
1424
1425
1426 /* VARARGS */
1427 static void
1428 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1429 {
1430         va_list ap;
1431
1432         (void)fprintf(stderr, "%s: ", program_name);
1433         va_start(ap, fmt);
1434         (void)vfprintf(stderr, fmt, ap);
1435         va_end(ap);
1436         if (*fmt) {
1437                 fmt += strlen(fmt);
1438                 if (fmt[-1] != '\n')
1439                         (void)fputc('\n', stderr);
1440         }
1441         exit(1);
1442         /* NOTREACHED */
1443 }
1444
1445 /* VARARGS */
1446 static void
1447 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1448 {
1449         va_list ap;
1450
1451         (void)fprintf(stderr, "%s: WARNING: ", program_name);
1452         va_start(ap, fmt);
1453         (void)vfprintf(stderr, fmt, ap);
1454         va_end(ap);
1455         if (*fmt) {
1456                 fmt += strlen(fmt);
1457                 if (fmt[-1] != '\n')
1458                         (void)fputc('\n', stderr);
1459         }
1460 }
1461