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 1.283 2008-09-25 21:45:50 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 #include <limits.h>
  69 #ifndef WIN32
  70 #include <sys/wait.h>
  71 #include <sys/resource.h>
  72 #include <pwd.h>
  73 #include <grp.h>
  74 #include <errno.h>
  75 #endif /* WIN32 */
  76
  77
  78 #include "netdissect.h"
  79 #include "interface.h"
  80 #include "addrtoname.h"
  81 #include "machdep.h"
  82 #include "setsignal.h"
  83 #include "gmt2local.h"
  84 #include "pcap-missing.h"
  85
  86 #ifndef NAME_MAX
  87 #define NAME_MAX 255
  88 #endif
  89
  90 netdissect_options Gndo;
  91 netdissect_options *gndo = &Gndo;
  92
  93 static int dflag;                       /* print filter code */
  94 static int Lflag;                       /* list available data link types and exit */
  95 static char *zflag = NULL;              /* compress each savefile using a specified command (like gzip or bzip2) */
  96
  97 static int infodelay;
  98 static int infoprint;
  99
 100 char *program_name;
 101
 102 int32_t thiszone;               /* seconds offset from gmt to local time */
 103
 104 /* Forwards */
 105 static RETSIGTYPE cleanup(int);
 106 static RETSIGTYPE child_cleanup(int);
 107 static void usage(void) __attribute__((noreturn));
 108 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
 109
 110 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 111 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
 112 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 113 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 114 static void droproot(const char *, const char *);
 115 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
 116 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
 117
 118 #ifdef SIGINFO
 119 RETSIGTYPE requestinfo(int);
 120 #endif
 121
 122 #if defined(USE_WIN32_MM_TIMER)
 123   #include <MMsystem.h>
 124   static UINT timer_id;
 125   static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
 126 #elif defined(HAVE_ALARM)
 127   static void verbose_stats_dump(int sig);
 128 #endif
 129
 130 static void info(int);
 131 static u_int packets_captured;
 132
 133 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
 134 typedef u_int (*if_ndo_printer)(struct netdissect_options *ndo,
 135                                 const struct pcap_pkthdr *, const u_char *);
 136
 137 struct printer {
 138         if_printer f;
 139         int type;
 140 };
 141
 142
 143 struct ndo_printer {
 144         if_ndo_printer f;
 145         int type;
 146 };
 147
 148
 149 static struct printer printers[] = {
 150         { arcnet_if_print,      DLT_ARCNET },
 151 #ifdef DLT_ARCNET_LINUX
 152         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 153 #endif
 154         { ether_if_print,       DLT_EN10MB },
 155         { token_if_print,       DLT_IEEE802 },
 156 #ifdef DLT_LANE8023
 157         { lane_if_print,        DLT_LANE8023 },
 158 #endif
 159 #ifdef DLT_CIP
 160         { cip_if_print,         DLT_CIP },
 161 #endif
 162 #ifdef DLT_ATM_CLIP
 163         { cip_if_print,         DLT_ATM_CLIP },
 164 #endif
 165         { sl_if_print,          DLT_SLIP },
 166 #ifdef DLT_SLIP_BSDOS
 167         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 168 #endif
 169         { ppp_if_print,         DLT_PPP },
 170 #ifdef DLT_PPP_WITHDIRECTION
 171         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 172 #endif
 173 #ifdef DLT_PPP_BSDOS
 174         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 175 #endif
 176         { fddi_if_print,        DLT_FDDI },
 177         { null_if_print,        DLT_NULL },
 178 #ifdef DLT_LOOP
 179         { null_if_print,        DLT_LOOP },
 180 #endif
 181         { raw_if_print,         DLT_RAW },
 182         { atm_if_print,         DLT_ATM_RFC1483 },
 183 #ifdef DLT_C_HDLC
 184         { chdlc_if_print,       DLT_C_HDLC },
 185 #endif
 186 #ifdef DLT_HDLC
 187         { chdlc_if_print,       DLT_HDLC },
 188 #endif
 189 #ifdef DLT_PPP_SERIAL
 190         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 191 #endif
 192 #ifdef DLT_PPP_ETHER
 193         { pppoe_if_print,       DLT_PPP_ETHER },
 194 #endif
 195 #ifdef DLT_LINUX_SLL
 196         { sll_if_print,         DLT_LINUX_SLL },
 197 #endif
 198 #ifdef DLT_IEEE802_11
 199         { ieee802_11_if_print,  DLT_IEEE802_11},
 200 #endif
 201 #ifdef DLT_LTALK
 202         { ltalk_if_print,       DLT_LTALK },
 203 #endif
 204 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
 205         { pflog_if_print,       DLT_PFLOG },
 206 #endif
 207 #ifdef DLT_FR
 208         { fr_if_print,          DLT_FR },
 209 #endif
 210 #ifdef DLT_FRELAY
 211         { fr_if_print,          DLT_FRELAY },
 212 #endif
 213 #ifdef DLT_SUNATM
 214         { sunatm_if_print,      DLT_SUNATM },
 215 #endif
 216 #ifdef DLT_IP_OVER_FC
 217         { ipfc_if_print,        DLT_IP_OVER_FC },
 218 #endif
 219 #ifdef DLT_PRISM_HEADER
 220         { prism_if_print,       DLT_PRISM_HEADER },
 221 #endif
 222 #ifdef DLT_IEEE802_11_RADIO
 223         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 224 #endif
 225 #ifdef DLT_ENC
 226         { enc_if_print,         DLT_ENC },
 227 #endif
 228 #ifdef DLT_SYMANTEC_FIREWALL
 229         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 230 #endif
 231 #ifdef DLT_APPLE_IP_OVER_IEEE1394
 232         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
 233 #endif
 234 #ifdef DLT_IEEE802_11_RADIO_AVS
 235         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 236 #endif
 237 #ifdef DLT_JUNIPER_ATM1
 238         { juniper_atm1_print,   DLT_JUNIPER_ATM1 },
 239 #endif
 240 #ifdef DLT_JUNIPER_ATM2
 241         { juniper_atm2_print,   DLT_JUNIPER_ATM2 },
 242 #endif
 243 #ifdef DLT_JUNIPER_MFR
 244         { juniper_mfr_print,    DLT_JUNIPER_MFR },
 245 #endif
 246 #ifdef DLT_JUNIPER_MLFR
 247         { juniper_mlfr_print,   DLT_JUNIPER_MLFR },
 248 #endif
 249 #ifdef DLT_JUNIPER_MLPPP
 250         { juniper_mlppp_print,  DLT_JUNIPER_MLPPP },
 251 #endif
 252 #ifdef DLT_JUNIPER_PPPOE
 253         { juniper_pppoe_print,  DLT_JUNIPER_PPPOE },
 254 #endif
 255 #ifdef DLT_JUNIPER_PPPOE_ATM
 256         { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
 257 #endif
 258 #ifdef DLT_JUNIPER_GGSN
 259         { juniper_ggsn_print,   DLT_JUNIPER_GGSN },
 260 #endif
 261 #ifdef DLT_JUNIPER_ES
 262         { juniper_es_print,     DLT_JUNIPER_ES },
 263 #endif
 264 #ifdef DLT_JUNIPER_MONITOR
 265         { juniper_monitor_print, DLT_JUNIPER_MONITOR },
 266 #endif
 267 #ifdef DLT_JUNIPER_SERVICES
 268         { juniper_services_print, DLT_JUNIPER_SERVICES },
 269 #endif
 270 #ifdef DLT_JUNIPER_ETHER
 271         { juniper_ether_print,  DLT_JUNIPER_ETHER },
 272 #endif
 273 #ifdef DLT_JUNIPER_PPP
 274         { juniper_ppp_print,    DLT_JUNIPER_PPP },
 275 #endif
 276 #ifdef DLT_JUNIPER_FRELAY
 277         { juniper_frelay_print, DLT_JUNIPER_FRELAY },
 278 #endif
 279 #ifdef DLT_JUNIPER_CHDLC
 280         { juniper_chdlc_print,  DLT_JUNIPER_CHDLC },
 281 #endif
 282 #ifdef DLT_MFR
 283         { mfr_if_print,         DLT_MFR },
 284 #endif
 285 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
 286         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
 287 #endif
 288 #ifdef HAVE_PCAP_USB_H
 289 #ifdef DLT_USB_LINUX
 290         { usb_linux_48_byte_print, DLT_USB_LINUX},
 291 #endif /* DLT_USB_LINUX */
 292 #ifdef DLT_USB_LINUX_MMAPPED
 293         { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
 294 #endif /* DLT_USB_LINUX_MMAPPED */
 295 #endif /* HAVE_PCAP_USB_H */
 296 #ifdef DLT_IPV4
 297         { raw_if_print,         DLT_IPV4 },
 298 #endif
 299 #ifdef DLT_IPV6
 300         { raw_if_print,         DLT_IPV6 },
 301 #endif
 302         { NULL,                 0 },
 303 };
 304
 305 static struct ndo_printer ndo_printers[] = {
 306 #ifdef DLT_IPNET
 307         { ipnet_if_print,       DLT_IPNET },
 308 #endif
 309         { NULL,                 0 },
 310 };
 311
 312 static if_printer
 313 lookup_printer(int type)
 314 {
 315         struct printer *p;
 316
 317         for (p = printers; p->f; ++p)
 318                 if (type == p->type)
 319                         return p->f;
 320
 321         return NULL;
 322         /* NOTREACHED */
 323 }
 324
 325 static if_ndo_printer
 326 lookup_ndo_printer(int type)
 327 {
 328         struct ndo_printer *p;
 329
 330         for (p = ndo_printers; p->f; ++p)
 331                 if (type == p->type)
 332                         return p->f;
 333
 334         return NULL;
 335         /* NOTREACHED */
 336 }
 337
 338 static pcap_t *pd;
 339
 340 static int supports_monitor_mode;
 341
 342 extern int optind;
 343 extern int opterr;
 344 extern char *optarg;
 345
 346 struct print_info {
 347         netdissect_options *ndo;
 348         union {
 349                 if_printer     printer;
 350                 if_ndo_printer ndo_printer;
 351         } p;
 352         int ndo_type;
 353 };
 354
 355 struct dump_info {
 356         char    *WFileName;
 357         char    *CurrentFileName;
 358         pcap_t  *pd;
 359         pcap_dumper_t *p;
 360 };
 361
 362 static void
 363 show_dlts_and_exit(const char *device, pcap_t *pd)
 364 {
 365         int n_dlts;
 366         int *dlts = 0;
 367         const char *dlt_name;
 368
 369         n_dlts = pcap_list_datalinks(pd, &dlts);
 370         if (n_dlts < 0)
 371                 error("%s", pcap_geterr(pd));
 372         else if (n_dlts == 0 || !dlts)
 373                 error("No data link types.");
 374
 375         /*
 376          * If the interface is known to support monitor mode, indicate
 377          * whether these are the data link types available when not in
 378          * monitor mode, if -I wasn't specified, or when in monitor mode,
 379          * when -I was specified (the link-layer types available in
 380          * monitor mode might be different from the ones available when
 381          * not in monitor mode).
 382          */
 383         if (supports_monitor_mode)
 384                 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
 385                     device,
 386                     Iflag ? "when in monitor mode" : "when not in monitor mode");
 387         else
 388                 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
 389                     device);
 390
 391         while (--n_dlts >= 0) {
 392                 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
 393                 if (dlt_name != NULL) {
 394                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
 395                             pcap_datalink_val_to_description(dlts[n_dlts]));
 396
 397                         /*
 398                          * OK, does tcpdump handle that type?
 399                          */
 400                         if (lookup_printer(dlts[n_dlts]) == NULL
 401                             && lookup_ndo_printer(dlts[n_dlts]) == NULL)
 402                                 (void) fprintf(stderr, " (printing not supported)");
 403                         putchar('\n');
 404                 } else {
 405                         (void) fprintf(stderr, "  DLT %d (printing not supported)\n",
 406                             dlts[n_dlts]);
 407                 }
 408         }
 409         free(dlts);
 410         exit(0);
 411 }
 412
 413 /*
 414  * Set up flags that might or might not be supported depending on the
 415  * version of libpcap we're using.
 416  */
 417 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
 418 #define B_FLAG          "B:"
 419 #define B_FLAG_USAGE    " [ -B size ]"
 420 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
 421 #define B_FLAG
 422 #define B_FLAG_USAGE
 423 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
 424
 425 #ifdef HAVE_PCAP_CREATE
 426 #define I_FLAG          "I"
 427 #else /* HAVE_PCAP_CREATE */
 428 #define I_FLAG
 429 #endif /* HAVE_PCAP_CREATE */
 430
 431 #ifdef HAVE_PCAP_FINDALLDEVS
 432 #ifndef HAVE_PCAP_IF_T
 433 #undef HAVE_PCAP_FINDALLDEVS
 434 #endif
 435 #endif
 436
 437 #ifdef HAVE_PCAP_FINDALLDEVS
 438 #define D_FLAG  "D"
 439 #else
 440 #define D_FLAG
 441 #endif
 442
 443 #ifdef HAVE_PCAP_DUMP_FLUSH
 444 #define U_FLAG  "U"
 445 #else
 446 #define U_FLAG
 447 #endif
 448
 449 #ifndef WIN32
 450 /* Drop root privileges and chroot if necessary */
 451 static void
 452 droproot(const char *username, const char *chroot_dir)
 453 {
 454         struct passwd *pw = NULL;
 455
 456         if (chroot_dir && !username) {
 457                 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
 458                 exit(1);
 459         }
 460
 461         pw = getpwnam(username);
 462         if (pw) {
 463                 if (chroot_dir) {
 464                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
 465                                 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
 466                                     chroot_dir, pcap_strerror(errno));
 467                                 exit(1);
 468                         }
 469                 }
 470                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
 471                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
 472                         fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
 473                             username,
 474                             (unsigned long)pw->pw_uid,
 475                             (unsigned long)pw->pw_gid,
 476                             pcap_strerror(errno));
 477                         exit(1);
 478                 }
 479         }
 480         else {
 481                 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
 482                     username);
 483                 exit(1);
 484         }
 485 }
 486 #endif /* WIN32 */
 487
 488 static int
 489 getWflagChars(int x)
 490 {
 491         int c = 0;
 492
 493         x -= 1;
 494         while (x > 0) {
 495                 c += 1;
 496                 x /= 10;
 497         }
 498
 499         return c;
 500 }
 501
 502
 503 static void
 504 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
 505 {
 506         char *filename = malloc(NAME_MAX + 1);
 507
 508         /* Process with strftime if Gflag is set. */
 509         if (Gflag != 0) {
 510           struct tm *local_tm;
 511
 512           /* Convert Gflag_time to a usable format */
 513           if ((local_tm = localtime(&Gflag_time)) == NULL) {
 514                   error("MakeTimedFilename: localtime");
 515           }
 516
 517           /* There's no good way to detect an error in strftime since a return
 518            * value of 0 isn't necessarily failure.
 519            */
 520           strftime(filename, NAME_MAX, orig_name, local_tm);
 521         } else {
 522           strncpy(filename, orig_name, NAME_MAX);
 523         }
 524
 525         if (cnt == 0 && max_chars == 0)
 526                 strncpy(buffer, filename, NAME_MAX + 1);
 527         else
 528                 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
 529                   /* Report an error if the filename is too large */
 530                   error("too many output files or filename is too long (> %d)", NAME_MAX);
 531         free(filename);
 532 }
 533
 534 static int tcpdump_printf(netdissect_options *ndo _U_,
 535                           const char *fmt, ...)
 536 {
 537
 538   va_list args;
 539   int ret;
 540
 541   va_start(args, fmt);
 542   ret=vfprintf(stdout, fmt, args);
 543   va_end(args);
 544
 545   return ret;
 546 }
 547
 548 int
 549 main(int argc, char **argv)
 550 {
 551         register int cnt, op, i;
 552         bpf_u_int32 localnet, netmask;
 553         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
 554         pcap_handler callback;
 555         int type;
 556         struct bpf_program fcode;
 557 #ifndef WIN32
 558         RETSIGTYPE (*oldhandler)(int);
 559 #endif
 560         struct print_info printinfo;
 561         struct dump_info dumpinfo;
 562         u_char *pcap_userdata;
 563         char ebuf[PCAP_ERRBUF_SIZE];
 564         char *username = NULL;
 565         char *chroot_dir = NULL;
 566 #ifdef HAVE_PCAP_FINDALLDEVS
 567         pcap_if_t *devpointer;
 568         int devnum;
 569 #endif
 570         int status;
 571 #ifdef WIN32
 572         if(wsockinit() != 0) return 1;
 573 #endif /* WIN32 */
 574
 575         gndo->ndo_Oflag=1;
 576         gndo->ndo_Rflag=1;
 577         gndo->ndo_dlt=-1;
 578         gndo->ndo_default_print=ndo_default_print;
 579         gndo->ndo_printf=tcpdump_printf;
 580         gndo->ndo_error=ndo_error;
 581         gndo->ndo_warning=ndo_warning;
 582         gndo->ndo_snaplen = DEFAULT_SNAPLEN;
 583
 584         cnt = -1;
 585         device = NULL;
 586         infile = NULL;
 587         RFileName = NULL;
 588         WFileName = NULL;
 589         if ((cp = strrchr(argv[0], '/')) != NULL)
 590                 program_name = cp + 1;
 591         else
 592                 program_name = argv[0];
 593
 594         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 595                 error("%s", ebuf);
 596
 597 #ifdef LIBSMI
 598         smiInit("tcpdump");
 599 #endif
 600
 601         opterr = 0;
 602         while (
 603             (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:i:" I_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1)
 604                 switch (op) {
 605
 606                 case 'a':
 607                         /* compatibility for old -a */
 608                         break;
 609
 610                 case 'A':
 611                         ++Aflag;
 612                         break;
 613
 614                 case 'b':
 615                         ++bflag;
 616                         break;
 617
 618 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
 619                 case 'B':
 620                         Bflag = atoi(optarg)*1024;
 621                         if (Bflag <= 0)
 622                                 error("invalid packet buffer size %s", optarg);
 623                         break;
 624 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
 625
 626                 case 'c':
 627                         cnt = atoi(optarg);
 628                         if (cnt <= 0)
 629                                 error("invalid packet count %s", optarg);
 630                         break;
 631
 632                 case 'C':
 633                         Cflag = atoi(optarg) * 1000000;
 634                         if (Cflag < 0)
 635                                 error("invalid file size %s", optarg);
 636                         break;
 637
 638                 case 'd':
 639                         ++dflag;
 640                         break;
 641
 642 #ifdef HAVE_PCAP_FINDALLDEVS
 643                 case 'D':
 644                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 645                                 error("%s", ebuf);
 646                         else {
 647                                 for (i = 0; devpointer != 0; i++) {
 648                                         printf("%d.%s", i+1, devpointer->name);
 649                                         if (devpointer->description != NULL)
 650                                                 printf(" (%s)", devpointer->description);
 651                                         printf("\n");
 652                                         devpointer = devpointer->next;
 653                                 }
 654                         }
 655                         return 0;
 656 #endif /* HAVE_PCAP_FINDALLDEVS */
 657
 658                 case 'L':
 659                         Lflag++;
 660                         break;
 661
 662                 case 'e':
 663                         ++eflag;
 664                         break;
 665
 666                 case 'E':
 667 #ifndef HAVE_LIBCRYPTO
 668                         warning("crypto code not compiled in");
 669 #endif
 670                         gndo->ndo_espsecret = optarg;
 671                         break;
 672
 673                 case 'f':
 674                         ++fflag;
 675                         break;
 676
 677                 case 'F':
 678                         infile = optarg;
 679                         break;
 680
 681                 case 'G':
 682                         Gflag = atoi(optarg);
 683                         if (Gflag < 0)
 684                                 error("invalid number of seconds %s", optarg);
 685
 686                         /* We will create one file initially. */
 687                         Gflag_count = 0;
 688
 689                         /* Grab the current time for rotation use. */
 690                         if ((Gflag_time = time(NULL)) == (time_t)-1) {
 691                                 error("main: can't get current time: %s",
 692                                     pcap_strerror(errno));
 693                         }
 694                         break;
 695
 696                 case 'i':
 697                         if (optarg[0] == '0' && optarg[1] == 0)
 698                                 error("Invalid adapter index");
 699
 700 #ifdef HAVE_PCAP_FINDALLDEVS
 701                         /*
 702                          * If the argument is a number, treat it as
 703                          * an index into the list of adapters, as
 704                          * printed by "tcpdump -D".
 705                          *
 706                          * This should be OK on UNIX systems, as interfaces
 707                          * shouldn't have names that begin with digits.
 708                          * It can be useful on Windows, where more than
 709                          * one interface can have the same name.
 710                          */
 711                         if ((devnum = atoi(optarg)) != 0) {
 712                                 if (devnum < 0)
 713                                         error("Invalid adapter index");
 714
 715                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 716                                         error("%s", ebuf);
 717                                 else {
 718                                         /*
 719                                          * Look for the devnum-th entry
 720                                          * in the list of devices
 721                                          * (1-based).
 722                                          */
 723                                         for (i = 0;
 724                                             i < devnum-1 && devpointer != NULL;
 725                                             i++, devpointer = devpointer->next)
 726                                                 ;
 727                                         if (devpointer == NULL)
 728                                                 error("Invalid adapter index");
 729                                 }
 730                                 device = devpointer->name;
 731                                 break;
 732                         }
 733 #endif /* HAVE_PCAP_FINDALLDEVS */
 734                         device = optarg;
 735                         break;
 736
 737 #ifdef HAVE_PCAP_CREATE
 738                 case 'I':
 739                         ++Iflag;
 740                         break;
 741 #endif /* HAVE_PCAP_CREATE */
 742
 743                 case 'l':
 744 #ifdef WIN32
 745                         /*
 746                          * _IOLBF is the same as _IOFBF in Microsoft's C
 747                          * libraries; the only alternative they offer
 748                          * is _IONBF.
 749                          *
 750                          * XXX - this should really be checking for MSVC++,
 751                          * not WIN32, if, for example, MinGW has its own
 752                          * C library that is more UNIX-compatible.
 753                          */
 754                         setvbuf(stdout, NULL, _IONBF, 0);
 755 #else /* WIN32 */
 756 #ifdef HAVE_SETLINEBUF
 757                         setlinebuf(stdout);
 758 #else
 759                         setvbuf(stdout, NULL, _IOLBF, 0);
 760 #endif
 761 #endif /* WIN32 */
 762                         break;
 763
 764                 case 'K':
 765                         ++Kflag;
 766                         break;
 767
 768                 case 'm':
 769 #ifdef LIBSMI
 770                         if (smiLoadModule(optarg) == 0) {
 771                                 error("could not load MIB module %s", optarg);
 772                         }
 773                         sflag = 1;
 774 #else
 775                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 776                                       program_name, optarg);
 777                         (void)fprintf(stderr, "(no libsmi support)\n");
 778 #endif
 779                         break;
 780
 781                 case 'M':
 782                         /* TCP-MD5 shared secret */
 783 #ifndef HAVE_LIBCRYPTO
 784                         warning("crypto code not compiled in");
 785 #endif
 786                         sigsecret = optarg;
 787                         break;
 788
 789                 case 'n':
 790                         ++nflag;
 791                         break;
 792
 793                 case 'N':
 794                         ++Nflag;
 795                         break;
 796
 797                 case 'O':
 798                         Oflag = 0;
 799                         break;
 800
 801                 case 'p':
 802                         ++pflag;
 803                         break;
 804
 805                 case 'q':
 806                         ++qflag;
 807                         ++suppress_default_print;
 808                         break;
 809
 810                 case 'r':
 811                         RFileName = optarg;
 812                         break;
 813
 814                 case 'R':
 815                         Rflag = 0;
 816                         break;
 817
 818                 case 's': {
 819                         char *end;
 820
 821                         snaplen = strtol(optarg, &end, 0);
 822                         if (optarg == end || *end != '\0'
 823                             || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
 824                                 error("invalid snaplen %s", optarg);
 825                         else if (snaplen == 0)
 826                                 snaplen = MAXIMUM_SNAPLEN;
 827                         break;
 828                 }
 829
 830                 case 'S':
 831                         ++Sflag;
 832                         break;
 833
 834                 case 't':
 835                         ++tflag;
 836                         break;
 837
 838                 case 'T':
 839                         if (strcasecmp(optarg, "vat") == 0)
 840                                 packettype = PT_VAT;
 841                         else if (strcasecmp(optarg, "wb") == 0)
 842                                 packettype = PT_WB;
 843                         else if (strcasecmp(optarg, "rpc") == 0)
 844                                 packettype = PT_RPC;
 845                         else if (strcasecmp(optarg, "rtp") == 0)
 846                                 packettype = PT_RTP;
 847                         else if (strcasecmp(optarg, "rtcp") == 0)
 848                                 packettype = PT_RTCP;
 849                         else if (strcasecmp(optarg, "snmp") == 0)
 850                                 packettype = PT_SNMP;
 851                         else if (strcasecmp(optarg, "cnfp") == 0)
 852                                 packettype = PT_CNFP;
 853                         else if (strcasecmp(optarg, "tftp") == 0)
 854                                 packettype = PT_TFTP;
 855                         else if (strcasecmp(optarg, "aodv") == 0)
 856                                 packettype = PT_AODV;
 857                         else
 858                                 error("unknown packet type `%s'", optarg);
 859                         break;
 860
 861                 case 'u':
 862                         ++uflag;
 863                         break;
 864
 865 #ifdef HAVE_PCAP_DUMP_FLUSH
 866                 case 'U':
 867                         ++Uflag;
 868                         break;
 869 #endif
 870
 871                 case 'v':
 872                         ++vflag;
 873                         break;
 874
 875                 case 'w':
 876                         WFileName = optarg;
 877                         break;
 878
 879                 case 'W':
 880                         Wflag = atoi(optarg);
 881                         if (Wflag < 0)
 882                                 error("invalid number of output files %s", optarg);
 883                         WflagChars = getWflagChars(Wflag);
 884                         break;
 885
 886                 case 'x':
 887                         ++xflag;
 888                         ++suppress_default_print;
 889                         break;
 890
 891                 case 'X':
 892                         ++Xflag;
 893                         ++suppress_default_print;
 894                         break;
 895
 896                 case 'y':
 897                         gndo->ndo_dltname = optarg;
 898                         gndo->ndo_dlt =
 899                           pcap_datalink_name_to_val(gndo->ndo_dltname);
 900                         if (gndo->ndo_dlt < 0)
 901                                 error("invalid data link type %s", gndo->ndo_dltname);
 902                         break;
 903
 904 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 905                 case 'Y':
 906                         {
 907                         /* Undocumented flag */
 908 #ifdef HAVE_PCAP_DEBUG
 909                         extern int pcap_debug;
 910                         pcap_debug = 1;
 911 #else
 912                         extern int yydebug;
 913                         yydebug = 1;
 914 #endif
 915                         }
 916                         break;
 917 #endif
 918                 case 'z':
 919                         if (optarg) {
 920                                 zflag = strdup(optarg);
 921                         } else {
 922                                 usage();
 923                                 /* NOTREACHED */
 924                         }
 925                         break;
 926
 927                 case 'Z':
 928                         if (optarg) {
 929                                 username = strdup(optarg);
 930                         }
 931                         else {
 932                                 usage();
 933                                 /* NOTREACHED */
 934                         }
 935                         break;
 936
 937                 default:
 938                         usage();
 939                         /* NOTREACHED */
 940                 }
 941
 942         switch (tflag) {
 943
 944         case 0: /* Default */
 945         case 4: /* Default + Date*/
 946                 thiszone = gmt2local(0);
 947                 break;
 948
 949         case 1: /* No time stamp */
 950         case 2: /* Unix timeval style */
 951         case 3: /* Microseconds since previous packet */
 952         case 5: /* Microseconds since first packet */
 953                 break;
 954
 955         default: /* Not supported */
 956                 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
 957                 break;
 958         }
 959
 960 #ifdef WITH_CHROOT
 961         /* if run as root, prepare for chrooting */
 962         if (getuid() == 0 || geteuid() == 0) {
 963                 /* future extensibility for cmd-line arguments */
 964                 if (!chroot_dir)
 965                         chroot_dir = WITH_CHROOT;
 966         }
 967 #endif
 968
 969 #ifdef WITH_USER
 970         /* if run as root, prepare for dropping root privileges */
 971         if (getuid() == 0 || geteuid() == 0) {
 972                 /* Run with '-Z root' to restore old behaviour */
 973                 if (!username)
 974                         username = WITH_USER;
 975         }
 976 #endif
 977
 978         if (RFileName != NULL) {
 979                 int dlt;
 980                 const char *dlt_name;
 981
 982 #ifndef WIN32
 983                 /*
 984                  * We don't need network access, so relinquish any set-UID
 985                  * or set-GID privileges we have (if any).
 986                  *
 987                  * We do *not* want set-UID privileges when opening a
 988                  * trace file, as that might let the user read other
 989                  * people's trace files (especially if we're set-UID
 990                  * root).
 991                  */
 992                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
 993                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
 994 #endif /* WIN32 */
 995                 pd = pcap_open_offline(RFileName, ebuf);
 996                 if (pd == NULL)
 997                         error("%s", ebuf);
 998                 dlt = pcap_datalink(pd);
 999                 dlt_name = pcap_datalink_val_to_name(dlt);
1000                 if (dlt_name == NULL) {
1001                         fprintf(stderr, "reading from file %s, link-type %u\n",
1002                             RFileName, dlt);
1003                 } else {
1004                         fprintf(stderr,
1005                             "reading from file %s, link-type %s (%s)\n",
1006                             RFileName, dlt_name,
1007                             pcap_datalink_val_to_description(dlt));
1008                 }
1009                 localnet = 0;
1010                 netmask = 0;
1011                 if (fflag != 0)
1012                         error("-f and -r options are incompatible");
1013         } else {
1014                 if (device == NULL) {
1015                         device = pcap_lookupdev(ebuf);
1016                         if (device == NULL)
1017                                 error("%s", ebuf);
1018                 }
1019 #ifdef WIN32
1020                 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1021                 {                                               //a Unicode string has a \0 as second byte (so strlen() is 1)
1022                         fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1023                 }
1024                 else
1025                 {
1026                         fprintf(stderr, "%s: listening on %s\n", program_name, device);
1027                 }
1028
1029                 fflush(stderr);
1030 #endif /* WIN32 */
1031 #ifdef HAVE_PCAP_CREATE
1032                 pd = pcap_create(device, ebuf);
1033                 if (pd == NULL)
1034                         error("%s", ebuf);
1035                 /*
1036                  * Is this an interface that supports monitor mode?
1037                  */
1038                 if (pcap_can_set_rfmon(pd) == 1)
1039                         supports_monitor_mode = 1;
1040                 else
1041                         supports_monitor_mode = 0;
1042                 status = pcap_set_snaplen(pd, snaplen);
1043                 if (status != 0)
1044                         error("%s: pcap_set_snaplen failed: %s",
1045                             device, pcap_statustostr(status));
1046                 status = pcap_set_promisc(pd, !pflag);
1047                 if (status != 0)
1048                         error("%s: pcap_set_promisc failed: %s",
1049                             device, pcap_statustostr(status));
1050                 if (Iflag) {
1051                         status = pcap_set_rfmon(pd, 1);
1052                         if (status != 0)
1053                                 error("%s: pcap_set_rfmon failed: %s",
1054                                     device, pcap_statustostr(status));
1055                 }
1056                 status = pcap_set_timeout(pd, 1000);
1057                 if (status != 0)
1058                         error("%s: pcap_set_timeout failed: %s",
1059                             device, pcap_statustostr(status));
1060                 if (Bflag != 0) {
1061                         status = pcap_set_buffer_size(pd, Bflag);
1062                         if (status != 0)
1063                                 error("%s: pcap_set_buffer_size failed: %s",
1064                                     device, pcap_statustostr(status));
1065                 }
1066                 status = pcap_activate(pd);
1067                 if (status < 0) {
1068                         /*
1069                          * pcap_activate() failed.
1070                          */
1071                         cp = pcap_geterr(pd);
1072                         if (status == PCAP_ERROR)
1073                                 error("%s", cp);
1074                         else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1075                                   status == PCAP_ERROR_PERM_DENIED) &&
1076                                  *cp != '\0')
1077                                 error("%s: %s\n(%s)", device,
1078                                     pcap_statustostr(status), cp);
1079                         else
1080                                 error("%s: %s", device,
1081                                     pcap_statustostr(status));
1082                 } else if (status > 0) {
1083                         /*
1084                          * pcap_activate() succeeded, but it's warning us
1085                          * of a problem it had.
1086                          */
1087                         cp = pcap_geterr(pd);
1088                         if (status == PCAP_WARNING)
1089                                 warning("%s", cp);
1090                         else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1091                                  *cp != '\0')
1092                                 warning("%s: %s\n(%s)", device,
1093                                     pcap_statustostr(status), cp);
1094                         else
1095                                 warning("%s: %s", device,
1096                                     pcap_statustostr(status));
1097                 }
1098 #else
1099                 *ebuf = '\0';
1100                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1101                 if (pd == NULL)
1102                         error("%s", ebuf);
1103                 else if (*ebuf)
1104                         warning("%s", ebuf);
1105 #endif /* HAVE_PCAP_CREATE */
1106                 /*
1107                  * Let user own process after socket has been opened.
1108                  */
1109 #ifndef WIN32
1110                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1111                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
1112 #endif /* WIN32 */
1113 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1114                 if(Bflag != 0)
1115                         if(pcap_setbuff(pd, Bflag)==-1){
1116                                 error("%s", pcap_geterr(pd));
1117                         }
1118 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1119                 if (Lflag)
1120                         show_dlts_and_exit(device, pd);
1121                 if (gndo->ndo_dlt >= 0) {
1122 #ifdef HAVE_PCAP_SET_DATALINK
1123                         if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1124                                 error("%s", pcap_geterr(pd));
1125 #else
1126                         /*
1127                          * We don't actually support changing the
1128                          * data link type, so we only let them
1129                          * set it to what it already is.
1130                          */
1131                         if (gndo->ndo_dlt != pcap_datalink(pd)) {
1132                                 error("%s is not one of the DLTs supported by this device\n",
1133                                       gndo->ndo_dltname);
1134                         }
1135 #endif
1136                         (void)fprintf(stderr, "%s: data link type %s\n",
1137                                       program_name, gndo->ndo_dltname);
1138                         (void)fflush(stderr);
1139                 }
1140                 i = pcap_snapshot(pd);
1141                 if (snaplen < i) {
1142                         warning("snaplen raised from %d to %d", snaplen, i);
1143                         snaplen = i;
1144                 }
1145                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1146                         localnet = 0;
1147                         netmask = 0;
1148                         warning("%s", ebuf);
1149                 }
1150         }
1151         if (infile)
1152                 cmdbuf = read_infile(infile);
1153         else
1154                 cmdbuf = copy_argv(&argv[optind]);
1155
1156         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1157                 error("%s", pcap_geterr(pd));
1158         free(cmdbuf);
1159         if (dflag) {
1160                 bpf_dump(&fcode, dflag);
1161                 pcap_close(pd);
1162                 exit(0);
1163         }
1164         init_addrtoname(localnet, netmask);
1165         init_checksum();
1166
1167 #ifndef WIN32
1168         (void)setsignal(SIGPIPE, cleanup);
1169         (void)setsignal(SIGTERM, cleanup);
1170         (void)setsignal(SIGINT, cleanup);
1171         (void)setsignal(SIGCHLD, child_cleanup);
1172 #endif /* WIN32 */
1173         /* Cooperate with nohup(1) */
1174 #ifndef WIN32
1175         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1176                 (void)setsignal(SIGHUP, oldhandler);
1177 #endif /* WIN32 */
1178
1179         if (pcap_setfilter(pd, &fcode) < 0)
1180                 error("%s", pcap_geterr(pd));
1181         if (WFileName) {
1182                 pcap_dumper_t *p;
1183                 /* Do not exceed the default NAME_MAX for files. */
1184                 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1185
1186                 if (dumpinfo.CurrentFileName == NULL)
1187                         error("malloc of dumpinfo.CurrentFileName");
1188
1189                 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1190                 if (Cflag != 0)
1191                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1192                 else
1193                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1194
1195                 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1196                 if (p == NULL)
1197                         error("%s", pcap_geterr(pd));
1198                 if (Cflag != 0 || Gflag != 0) {
1199                         callback = dump_packet_and_trunc;
1200                         dumpinfo.WFileName = WFileName;
1201                         dumpinfo.pd = pd;
1202                         dumpinfo.p = p;
1203                         pcap_userdata = (u_char *)&dumpinfo;
1204                 } else {
1205                         callback = dump_packet;
1206                         pcap_userdata = (u_char *)p;
1207                 }
1208         } else {
1209                 type = pcap_datalink(pd);
1210                 printinfo.ndo_type = 1;
1211                 printinfo.ndo = gndo;
1212                 printinfo.p.ndo_printer = lookup_ndo_printer(type);
1213                 if (printinfo.p.ndo_printer == NULL) {
1214                         printinfo.p.printer = lookup_printer(type);
1215                         printinfo.ndo_type = 0;
1216                         if (printinfo.p.printer == NULL) {
1217                                 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1218                                 if (gndo->ndo_dltname != NULL)
1219                                         error("packet printing is not supported for link type %s: use -w",
1220                                               gndo->ndo_dltname);
1221                                 else
1222                                         error("packet printing is not supported for link type %d: use -w", type);
1223                         }
1224                 }
1225                 callback = print_packet;
1226                 pcap_userdata = (u_char *)&printinfo;
1227         }
1228 #ifndef WIN32
1229         /*
1230          * We cannot do this earlier, because we want to be able to open
1231          * the file (if done) for writing before giving up permissions.
1232          */
1233         if (getuid() == 0 || geteuid() == 0) {
1234                 if (username || chroot_dir)
1235                         droproot(username, chroot_dir);
1236         }
1237 #endif /* WIN32 */
1238 #ifdef SIGINFO
1239         /*
1240          * We can't get statistics when reading from a file rather
1241          * than capturing from a device.
1242          */
1243         if (RFileName == NULL)
1244                 (void)setsignal(SIGINFO, requestinfo);
1245 #endif
1246
1247         if (vflag > 0 && WFileName) {
1248                 /*
1249                  * When capturing to a file, "-v" means tcpdump should,
1250                  * every 10 secodns, "v"erbosely report the number of
1251                  * packets captured.
1252                  */
1253 #ifdef USE_WIN32_MM_TIMER
1254                 /* call verbose_stats_dump() each 1000 +/-100msec */
1255                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1256                 setvbuf(stderr, NULL, _IONBF, 0);
1257 #elif defined(HAVE_ALARM)
1258                 (void)setsignal(SIGALRM, verbose_stats_dump);
1259                 alarm(1);
1260 #endif
1261         }
1262
1263 #ifndef WIN32
1264         if (RFileName == NULL) {
1265                 int dlt;
1266                 const char *dlt_name;
1267
1268                 if (!vflag && !WFileName) {
1269                         (void)fprintf(stderr,
1270                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1271                             program_name);
1272                 } else
1273                         (void)fprintf(stderr, "%s: ", program_name);
1274                 dlt = pcap_datalink(pd);
1275                 dlt_name = pcap_datalink_val_to_name(dlt);
1276                 if (dlt_name == NULL) {
1277                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1278                             device, dlt, snaplen);
1279                 } else {
1280                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1281                             device, dlt_name,
1282                             pcap_datalink_val_to_description(dlt), snaplen);
1283                 }
1284                 (void)fflush(stderr);
1285         }
1286 #endif /* WIN32 */
1287         status = pcap_loop(pd, cnt, callback, pcap_userdata);
1288         if (WFileName == NULL) {
1289                 /*
1290                  * We're printing packets.  Flush the printed output,
1291                  * so it doesn't get intermingled with error output.
1292                  */
1293                 if (status == -2) {
1294                         /*
1295                          * We got interrupted, so perhaps we didn't
1296                          * manage to finish a line we were printing.
1297                          * Print an extra newline, just in case.
1298                          */
1299                         putchar('\n');
1300                 }
1301                 (void)fflush(stdout);
1302         }
1303         if (status == -1) {
1304                 /*
1305                  * Error.  Report it.
1306                  */
1307                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1308                     program_name, pcap_geterr(pd));
1309         }
1310         if (RFileName == NULL) {
1311                 /*
1312                  * We're doing a live capture.  Report the capture
1313                  * statistics.
1314                  */
1315                 info(1);
1316         }
1317         pcap_close(pd);
1318         exit(status == -1 ? 1 : 0);
1319 }
1320
1321 /* make a clean exit on interrupts */
1322 static RETSIGTYPE
1323 cleanup(int signo _U_)
1324 {
1325 #ifdef USE_WIN32_MM_TIMER
1326         if (timer_id)
1327                 timeKillEvent(timer_id);
1328         timer_id = 0;
1329 #elif defined(HAVE_ALARM)
1330         alarm(0);
1331 #endif
1332
1333 #ifdef HAVE_PCAP_BREAKLOOP
1334         /*
1335          * We have "pcap_breakloop()"; use it, so that we do as little
1336          * as possible in the signal handler (it's probably not safe
1337          * to do anything with standard I/O streams in a signal handler -
1338          * the ANSI C standard doesn't say it is).
1339          */
1340         pcap_breakloop(pd);
1341 #else
1342         /*
1343          * We don't have "pcap_breakloop()"; this isn't safe, but
1344          * it's the best we can do.  Print the summary if we're
1345          * not reading from a savefile - i.e., if we're doing a
1346          * live capture - and exit.
1347          */
1348         if (pd != NULL && pcap_file(pd) == NULL) {
1349                 /*
1350                  * We got interrupted, so perhaps we didn't
1351                  * manage to finish a line we were printing.
1352                  * Print an extra newline, just in case.
1353                  */
1354                 putchar('\n');
1355                 (void)fflush(stdout);
1356                 info(1);
1357         }
1358         exit(0);
1359 #endif
1360 }
1361
1362 /*
1363   On windows, we do not use a fork, so we do not care less about
1364   waiting a child processes to die
1365  */
1366 #ifndef WIN32
1367 static RETSIGTYPE
1368 child_cleanup(int signo _U_)
1369 {
1370   wait(NULL);
1371 }
1372 #endif /* WIN32 */
1373
1374 static void
1375 info(register int verbose)
1376 {
1377         struct pcap_stat stat;
1378
1379         /*
1380          * Older versions of libpcap didn't set ps_ifdrop on some
1381          * platforms; initialize it to 0 to handle that.
1382          */
1383         stat.ps_ifdrop = 0;
1384         if (pcap_stats(pd, &stat) < 0) {
1385                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1386                 infoprint = 0;
1387                 return;
1388         }
1389
1390         if (!verbose)
1391                 fprintf(stderr, "%s: ", program_name);
1392
1393         (void)fprintf(stderr, "%u packets captured", packets_captured);
1394         if (!verbose)
1395                 fputs(", ", stderr);
1396         else
1397                 putc('\n', stderr);
1398         (void)fprintf(stderr, "%u packets received by filter", stat.ps_recv);
1399         if (!verbose)
1400                 fputs(", ", stderr);
1401         else
1402                 putc('\n', stderr);
1403         (void)fprintf(stderr, "%u packets dropped by kernel", stat.ps_drop);
1404         if (stat.ps_ifdrop != 0) {
1405                 if (!verbose)
1406                         fputs(", ", stderr);
1407                 else
1408                         putc('\n', stderr);
1409                 (void)fprintf(stderr, "%u packets dropped by interface\n",
1410                     stat.ps_ifdrop);
1411         } else
1412                 putc('\n', stderr);
1413         infoprint = 0;
1414 }
1415
1416 #ifndef WIN32
1417 static void
1418 compress_savefile(const char *filename)
1419 {
1420         if (fork())
1421                 return;
1422         /*
1423          * Set to lowest priority so that this doesn't disturb the capture
1424          */
1425 #ifdef NZERO
1426         setpriority(PRIO_PROCESS, 0, NZERO - 1);
1427 #else
1428         setpriority(PRIO_PROCESS, 0, 19);
1429 #endif
1430         if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1431                 fprintf(stderr,
1432                         "compress_savefile:execlp(%s, %s): %s\n",
1433                         zflag,
1434                         filename,
1435                         strerror(errno));
1436 }
1437 #else  /* WIN32 */
1438 static void
1439 compress_savefile(const char *filename)
1440 {
1441         fprintf(stderr,
1442                 "compress_savefile failed. Functionality not implemented under windows\n");
1443 }
1444 #endif /* WIN32 */
1445
1446 static void
1447 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1448 {
1449         struct dump_info *dump_info;
1450
1451         ++packets_captured;
1452
1453         ++infodelay;
1454
1455         dump_info = (struct dump_info *)user;
1456
1457         /*
1458          * XXX - this won't force the file to rotate on the specified time
1459          * boundary, but it will rotate on the first packet received after the
1460          * specified Gflag number of seconds. Note: if a Gflag time boundary
1461          * and a Cflag size boundary coincide, the time rotation will occur
1462          * first thereby cancelling the Cflag boundary (since the file should
1463          * be 0).
1464          */
1465         if (Gflag != 0) {
1466                 /* Check if it is time to rotate */
1467                 time_t t;
1468
1469                 /* Get the current time */
1470                 if ((t = time(NULL)) == (time_t)-1) {
1471                         error("dump_and_trunc_packet: can't get current_time: %s",
1472                             pcap_strerror(errno));
1473                 }
1474
1475
1476                 /* If the time is greater than the specified window, rotate */
1477                 if (t - Gflag_time >= Gflag) {
1478                         /* Update the Gflag_time */
1479                         Gflag_time = t;
1480                         /* Update Gflag_count */
1481                         Gflag_count++;
1482                         /*
1483                          * Close the current file and open a new one.
1484                          */
1485                         pcap_dump_close(dump_info->p);
1486
1487                         /*
1488                          * Compress the file we just closed, if the user asked for it
1489                          */
1490                         if (zflag != NULL)
1491                                 compress_savefile(dump_info->CurrentFileName);
1492
1493                         /*
1494                          * Check to see if we've exceeded the Wflag (when
1495                          * not using Cflag).
1496                          */
1497                         if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1498                                 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1499                                     Wflag);
1500                                 exit(0);
1501                                 /* NOTREACHED */
1502                         }
1503                         if (dump_info->CurrentFileName != NULL)
1504                                 free(dump_info->CurrentFileName);
1505                         /* Allocate space for max filename + \0. */
1506                         dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1507                         if (dump_info->CurrentFileName == NULL)
1508                                 error("dump_packet_and_trunc: malloc");
1509                         /*
1510                          * This is always the first file in the Cflag
1511                          * rotation: e.g. 0
1512                          * We also don't need numbering if Cflag is not set.
1513                          */
1514                         if (Cflag != 0)
1515                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1516                                     WflagChars);
1517                         else
1518                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1519
1520                         dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1521                         if (dump_info->p == NULL)
1522                                 error("%s", pcap_geterr(pd));
1523                 }
1524         }
1525
1526         /*
1527          * XXX - this won't prevent capture files from getting
1528          * larger than Cflag - the last packet written to the
1529          * file could put it over Cflag.
1530          */
1531         if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1532                 /*
1533                  * Close the current file and open a new one.
1534                  */
1535                 pcap_dump_close(dump_info->p);
1536
1537                 /*
1538                  * Compress the file we just closed, if the user asked for it
1539                  */
1540                 if (zflag != NULL)
1541                         compress_savefile(dump_info->CurrentFileName);
1542
1543                 Cflag_count++;
1544                 if (Wflag > 0) {
1545                         if (Cflag_count >= Wflag)
1546                                 Cflag_count = 0;
1547                 }
1548                 if (dump_info->CurrentFileName != NULL)
1549                         free(dump_info->CurrentFileName);
1550                 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1551                 if (dump_info->CurrentFileName == NULL)
1552                         error("dump_packet_and_trunc: malloc");
1553                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1554                 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1555                 if (dump_info->p == NULL)
1556                         error("%s", pcap_geterr(pd));
1557         }
1558
1559         pcap_dump((u_char *)dump_info->p, h, sp);
1560 #ifdef HAVE_PCAP_DUMP_FLUSH
1561         if (Uflag)
1562                 pcap_dump_flush(dump_info->p);
1563 #endif
1564
1565         --infodelay;
1566         if (infoprint)
1567                 info(0);
1568 }
1569
1570 static void
1571 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1572 {
1573         ++packets_captured;
1574
1575         ++infodelay;
1576
1577         pcap_dump(user, h, sp);
1578 #ifdef HAVE_PCAP_DUMP_FLUSH
1579         if (Uflag)
1580                 pcap_dump_flush((pcap_dumper_t *)user);
1581 #endif
1582
1583         --infodelay;
1584         if (infoprint)
1585                 info(0);
1586 }
1587
1588 static void
1589 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1590 {
1591         struct print_info *print_info;
1592         u_int hdrlen;
1593
1594         ++packets_captured;
1595
1596         ++infodelay;
1597         ts_print(&h->ts);
1598
1599         print_info = (struct print_info *)user;
1600
1601         /*
1602          * Some printers want to check that they're not walking off the
1603          * end of the packet.
1604          * Rather than pass it all the way down, we set this global.
1605          */
1606         snapend = sp + h->caplen;
1607
1608         if(print_info->ndo_type) {
1609                 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1610         } else {
1611                 hdrlen = (*print_info->p.printer)(h, sp);
1612         }
1613
1614         if (Xflag) {
1615                 /*
1616                  * Print the raw packet data in hex and ASCII.
1617                  */
1618                 if (Xflag > 1) {
1619                         /*
1620                          * Include the link-layer header.
1621                          */
1622                         hex_and_ascii_print("\n\t", sp, h->caplen);
1623                 } else {
1624                         /*
1625                          * Don't include the link-layer header - and if
1626                          * we have nothing past the link-layer header,
1627                          * print nothing.
1628                          */
1629                         if (h->caplen > hdrlen)
1630                                 hex_and_ascii_print("\n\t", sp + hdrlen,
1631                                     h->caplen - hdrlen);
1632                 }
1633         } else if (xflag) {
1634                 /*
1635                  * Print the raw packet data in hex.
1636                  */
1637                 if (xflag > 1) {
1638                         /*
1639                          * Include the link-layer header.
1640                          */
1641                         hex_print("\n\t", sp, h->caplen);
1642                 } else {
1643                         /*
1644                          * Don't include the link-layer header - and if
1645                          * we have nothing past the link-layer header,
1646                          * print nothing.
1647                          */
1648                         if (h->caplen > hdrlen)
1649                                 hex_print("\n\t", sp + hdrlen,
1650                                     h->caplen - hdrlen);
1651                 }
1652         } else if (Aflag) {
1653                 /*
1654                  * Print the raw packet data in ASCII.
1655                  */
1656                 if (Aflag > 1) {
1657                         /*
1658                          * Include the link-layer header.
1659                          */
1660                         ascii_print(sp, h->caplen);
1661                 } else {
1662                         /*
1663                          * Don't include the link-layer header - and if
1664                          * we have nothing past the link-layer header,
1665                          * print nothing.
1666                          */
1667                         if (h->caplen > hdrlen)
1668                                 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1669                 }
1670         }
1671
1672         putchar('\n');
1673
1674         --infodelay;
1675         if (infoprint)
1676                 info(0);
1677 }
1678
1679 #ifdef WIN32
1680         /*
1681          * XXX - there should really be libpcap calls to get the version
1682          * number as a string (the string would be generated from #defines
1683          * at run time, so that it's not generated from string constants
1684          * in the library, as, on many UNIX systems, those constants would
1685          * be statically linked into the application executable image, and
1686          * would thus reflect the version of libpcap on the system on
1687          * which the application was *linked*, not the system on which it's
1688          * *running*.
1689          *
1690          * That routine should be documented, unlike the "version[]"
1691          * string, so that UNIX vendors providing their own libpcaps
1692          * don't omit it (as a couple of vendors have...).
1693          *
1694          * Packet.dll should perhaps also export a routine to return the
1695          * version number of the Packet.dll code, to supply the
1696          * "Wpcap_version" information on Windows.
1697          */
1698         char WDversion[]="current-cvs.tcpdump.org";
1699 #if !defined(HAVE_GENERATED_VERSION)
1700         char version[]="current-cvs.tcpdump.org";
1701 #endif
1702         char pcap_version[]="current-cvs.tcpdump.org";
1703         char Wpcap_version[]="3.1";
1704 #endif
1705
1706 /*
1707  * By default, print the specified data out in hex and ASCII.
1708  */
1709 static void
1710 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1711 {
1712         hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1713 }
1714
1715 void
1716 default_print(const u_char *bp, u_int length)
1717 {
1718         ndo_default_print(gndo, bp, length);
1719 }
1720
1721 #ifdef SIGINFO
1722 RETSIGTYPE requestinfo(int signo _U_)
1723 {
1724         if (infodelay)
1725                 ++infoprint;
1726         else
1727                 info(0);
1728 }
1729 #endif
1730
1731 /*
1732  * Called once each second in verbose mode while dumping to file
1733  */
1734 #ifdef USE_WIN32_MM_TIMER
1735 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1736                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1737 {
1738         struct pcap_stat stat;
1739
1740         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1741                 fprintf(stderr, "Got %u\r", packets_captured);
1742 }
1743 #elif defined(HAVE_ALARM)
1744 static void verbose_stats_dump(int sig _U_)
1745 {
1746         struct pcap_stat stat;
1747
1748         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1749                 fprintf(stderr, "Got %u\r", packets_captured);
1750         alarm(1);
1751 }
1752 #endif
1753
1754 static void
1755 usage(void)
1756 {
1757         extern char version[];
1758 #ifndef HAVE_PCAP_LIB_VERSION
1759 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1760         extern char pcap_version[];
1761 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1762         static char pcap_version[] = "unknown";
1763 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1764 #endif /* HAVE_PCAP_LIB_VERSION */
1765
1766 #ifdef HAVE_PCAP_LIB_VERSION
1767 #ifdef WIN32
1768         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1769 #else /* WIN32 */
1770         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1771 #endif /* WIN32 */
1772         (void)fprintf(stderr, "%s\n",pcap_lib_version());
1773 #else /* HAVE_PCAP_LIB_VERSION */
1774 #ifdef WIN32
1775         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1776         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1777 #else /* WIN32 */
1778         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1779         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1780 #endif /* WIN32 */
1781 #endif /* HAVE_PCAP_LIB_VERSION */
1782         (void)fprintf(stderr,
1783 "Usage: %s [-aAbd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1784         (void)fprintf(stderr,
1785 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
1786         (void)fprintf(stderr,
1787 "\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
1788         (void)fprintf(stderr,
1789 "\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
1790         (void)fprintf(stderr,
1791 "\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
1792         (void)fprintf(stderr,
1793 "\t\t[ expression ]\n");
1794         exit(1);
1795 }
1796
1797
1798
1799 /* VARARGS */
1800 static void
1801 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1802 {
1803         va_list ap;
1804
1805         (void)fprintf(stderr, "%s: ", program_name);
1806         va_start(ap, fmt);
1807         (void)vfprintf(stderr, fmt, ap);
1808         va_end(ap);
1809         if (*fmt) {
1810                 fmt += strlen(fmt);
1811                 if (fmt[-1] != '\n')
1812                         (void)fputc('\n', stderr);
1813         }
1814         exit(1);
1815         /* NOTREACHED */
1816 }
1817
1818 /* VARARGS */
1819 static void
1820 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1821 {
1822         va_list ap;
1823
1824         (void)fprintf(stderr, "%s: WARNING: ", program_name);
1825         va_start(ap, fmt);
1826         (void)vfprintf(stderr, fmt, ap);
1827         va_end(ap);
1828         if (*fmt) {
1829                 fmt += strlen(fmt);
1830                 if (fmt[-1] != '\n')
1831                         (void)fputc('\n', stderr);
1832         }
1833 }