contrib/tcpdump/tcpdump.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Support for splitting captures into multiple files with a maximum
  22  * file size:
  23  *
  24  * Copyright (c) 2001
  25  *      Seth Webster <swebster@sst.ll.mit.edu>
  26  */
  27
  28 #ifndef lint
  29 static const char copyright[] _U_ =
  30     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
  31 The Regents of the University of California.  All rights reserved.\n";
  32 static const char rcsid[] _U_ =
  33     "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)";
  34 #endif
  35
  36 /* $FreeBSD$ */
  37
  38 /*
  39  * tcpdump - monitor tcp/ip traffic on an ethernet.
  40  *
  41  * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
  42  * Mercilessly hacked and occasionally improved since then via the
  43  * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
  44  */
  45
  46 #ifdef HAVE_CONFIG_H
  47 #include "config.h"
  48 #endif
  49
  50 #include <tcpdump-stdinc.h>
  51
  52 #ifdef WIN32
  53 #include "getopt.h"
  54 #include "w32_fzs.h"
  55 extern int strcasecmp (const char *__s1, const char *__s2);
  56 extern int SIZE_BUF;
  57 #define off_t long
  58 #define uint UINT
  59 #endif /* WIN32 */
  60
  61 #ifdef HAVE_SMI_H
  62 #include <smi.h>
  63 #endif
  64
  65 #include <pcap.h>
  66 #include <signal.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <limits.h>
  71 #ifndef WIN32
  72 #include <sys/wait.h>
  73 #include <sys/resource.h>
  74 #include <pwd.h>
  75 #include <grp.h>
  76 #include <errno.h>
  77 #endif /* WIN32 */
  78
  79 /* capabilities convinience library */
  80 #ifdef HAVE_CAP_NG_H
  81 #include <cap-ng.h>
  82 #endif /* HAVE_CAP_NG_H */
  83
  84 #include "netdissect.h"
  85 #include "interface.h"
  86 #include "addrtoname.h"
  87 #include "machdep.h"
  88 #include "setsignal.h"
  89 #include "gmt2local.h"
  90 #include "pcap-missing.h"
  91
  92 #ifndef PATH_MAX
  93 #define PATH_MAX 1024
  94 #endif
  95
  96 #ifdef SIGINFO
  97 #define SIGNAL_REQ_INFO SIGINFO
  98 #elif SIGUSR1
  99 #define SIGNAL_REQ_INFO SIGUSR1
 100 #endif
 101
 102 netdissect_options Gndo;
 103 netdissect_options *gndo = &Gndo;
 104
 105 static int dflag;                       /* print filter code */
 106 static int Lflag;                       /* list available data link types and exit */
 107 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 108 static int Jflag;                       /* list available time stamp types */
 109 #endif
 110 static char *zflag = NULL;              /* compress each savefile using a specified command (like gzip or bzip2) */
 111
 112 static int infodelay;
 113 static int infoprint;
 114
 115 char *program_name;
 116
 117 int32_t thiszone;               /* seconds offset from gmt to local time */
 118
 119 /* Forwards */
 120 static RETSIGTYPE cleanup(int);
 121 static RETSIGTYPE child_cleanup(int);
 122 static void usage(void) __attribute__((noreturn));
 123 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
 124
 125 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 126 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
 127 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 128 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 129 static void droproot(const char *, const char *);
 130 static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
 131      __attribute__ ((noreturn, format (printf, 2, 3)));
 132 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
 133
 134 #ifdef SIGNAL_REQ_INFO
 135 RETSIGTYPE requestinfo(int);
 136 #endif
 137
 138 #if defined(USE_WIN32_MM_TIMER)
 139   #include <MMsystem.h>
 140   static UINT timer_id;
 141   static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
 142 #elif defined(HAVE_ALARM)
 143   static void verbose_stats_dump(int sig);
 144 #endif
 145
 146 static void info(int);
 147 static u_int packets_captured;
 148
 149 struct printer {
 150         if_printer f;
 151         int type;
 152 };
 153
 154
 155 struct ndo_printer {
 156         if_ndo_printer f;
 157         int type;
 158 };
 159
 160
 161 static struct printer printers[] = {
 162         { arcnet_if_print,      DLT_ARCNET },
 163 #ifdef DLT_ARCNET_LINUX
 164         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
 165 #endif
 166         { token_if_print,       DLT_IEEE802 },
 167 #ifdef DLT_LANE8023
 168         { lane_if_print,        DLT_LANE8023 },
 169 #endif
 170 #ifdef DLT_CIP
 171         { cip_if_print,         DLT_CIP },
 172 #endif
 173 #ifdef DLT_ATM_CLIP
 174         { cip_if_print,         DLT_ATM_CLIP },
 175 #endif
 176         { sl_if_print,          DLT_SLIP },
 177 #ifdef DLT_SLIP_BSDOS
 178         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 179 #endif
 180         { ppp_if_print,         DLT_PPP },
 181 #ifdef DLT_PPP_WITHDIRECTION
 182         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 183 #endif
 184 #ifdef DLT_PPP_BSDOS
 185         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 186 #endif
 187         { fddi_if_print,        DLT_FDDI },
 188         { null_if_print,        DLT_NULL },
 189 #ifdef DLT_LOOP
 190         { null_if_print,        DLT_LOOP },
 191 #endif
 192         { raw_if_print,         DLT_RAW },
 193         { atm_if_print,         DLT_ATM_RFC1483 },
 194 #ifdef DLT_C_HDLC
 195         { chdlc_if_print,       DLT_C_HDLC },
 196 #endif
 197 #ifdef DLT_HDLC
 198         { chdlc_if_print,       DLT_HDLC },
 199 #endif
 200 #ifdef DLT_PPP_SERIAL
 201         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 202 #endif
 203 #ifdef DLT_PPP_ETHER
 204         { pppoe_if_print,       DLT_PPP_ETHER },
 205 #endif
 206 #ifdef DLT_LINUX_SLL
 207         { sll_if_print,         DLT_LINUX_SLL },
 208 #endif
 209 #ifdef DLT_IEEE802_11
 210         { ieee802_11_if_print,  DLT_IEEE802_11},
 211 #endif
 212 #ifdef DLT_LTALK
 213         { ltalk_if_print,       DLT_LTALK },
 214 #endif
 215 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
 216         { pflog_if_print,       DLT_PFLOG },
 217 #endif
 218 #ifdef DLT_FR
 219         { fr_if_print,          DLT_FR },
 220 #endif
 221 #ifdef DLT_FRELAY
 222         { fr_if_print,          DLT_FRELAY },
 223 #endif
 224 #ifdef DLT_SUNATM
 225         { sunatm_if_print,      DLT_SUNATM },
 226 #endif
 227 #ifdef DLT_IP_OVER_FC
 228         { ipfc_if_print,        DLT_IP_OVER_FC },
 229 #endif
 230 #ifdef DLT_PRISM_HEADER
 231         { prism_if_print,       DLT_PRISM_HEADER },
 232 #endif
 233 #ifdef DLT_IEEE802_11_RADIO
 234         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 235 #endif
 236 #ifdef DLT_ENC
 237         { enc_if_print,         DLT_ENC },
 238 #endif
 239 #ifdef DLT_SYMANTEC_FIREWALL
 240         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 241 #endif
 242 #ifdef DLT_APPLE_IP_OVER_IEEE1394
 243         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
 244 #endif
 245 #ifdef DLT_IEEE802_11_RADIO_AVS
 246         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 247 #endif
 248 #ifdef DLT_JUNIPER_ATM1
 249         { juniper_atm1_print,   DLT_JUNIPER_ATM1 },
 250 #endif
 251 #ifdef DLT_JUNIPER_ATM2
 252         { juniper_atm2_print,   DLT_JUNIPER_ATM2 },
 253 #endif
 254 #ifdef DLT_JUNIPER_MFR
 255         { juniper_mfr_print,    DLT_JUNIPER_MFR },
 256 #endif
 257 #ifdef DLT_JUNIPER_MLFR
 258         { juniper_mlfr_print,   DLT_JUNIPER_MLFR },
 259 #endif
 260 #ifdef DLT_JUNIPER_MLPPP
 261         { juniper_mlppp_print,  DLT_JUNIPER_MLPPP },
 262 #endif
 263 #ifdef DLT_JUNIPER_PPPOE
 264         { juniper_pppoe_print,  DLT_JUNIPER_PPPOE },
 265 #endif
 266 #ifdef DLT_JUNIPER_PPPOE_ATM
 267         { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
 268 #endif
 269 #ifdef DLT_JUNIPER_GGSN
 270         { juniper_ggsn_print,   DLT_JUNIPER_GGSN },
 271 #endif
 272 #ifdef DLT_JUNIPER_ES
 273         { juniper_es_print,     DLT_JUNIPER_ES },
 274 #endif
 275 #ifdef DLT_JUNIPER_MONITOR
 276         { juniper_monitor_print, DLT_JUNIPER_MONITOR },
 277 #endif
 278 #ifdef DLT_JUNIPER_SERVICES
 279         { juniper_services_print, DLT_JUNIPER_SERVICES },
 280 #endif
 281 #ifdef DLT_JUNIPER_ETHER
 282         { juniper_ether_print,  DLT_JUNIPER_ETHER },
 283 #endif
 284 #ifdef DLT_JUNIPER_PPP
 285         { juniper_ppp_print,    DLT_JUNIPER_PPP },
 286 #endif
 287 #ifdef DLT_JUNIPER_FRELAY
 288         { juniper_frelay_print, DLT_JUNIPER_FRELAY },
 289 #endif
 290 #ifdef DLT_JUNIPER_CHDLC
 291         { juniper_chdlc_print,  DLT_JUNIPER_CHDLC },
 292 #endif
 293 #ifdef DLT_MFR
 294         { mfr_if_print,         DLT_MFR },
 295 #endif
 296 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
 297         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
 298 #endif
 299 #ifdef HAVE_PCAP_USB_H
 300 #ifdef DLT_USB_LINUX
 301         { usb_linux_48_byte_print, DLT_USB_LINUX},
 302 #endif /* DLT_USB_LINUX */
 303 #ifdef DLT_USB_LINUX_MMAPPED
 304         { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
 305 #endif /* DLT_USB_LINUX_MMAPPED */
 306 #endif /* HAVE_PCAP_USB_H */
 307 #ifdef DLT_IPV4
 308         { raw_if_print,         DLT_IPV4 },
 309 #endif
 310 #ifdef DLT_IPV6
 311         { raw_if_print,         DLT_IPV6 },
 312 #endif
 313         { NULL,                 0 },
 314 };
 315
 316 static struct ndo_printer ndo_printers[] = {
 317         { ether_if_print,       DLT_EN10MB },
 318 #ifdef DLT_IPNET
 319         { ipnet_if_print,       DLT_IPNET },
 320 #endif
 321 #ifdef DLT_IEEE802_15_4
 322         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
 323 #endif
 324 #ifdef DLT_IEEE802_15_4_NOFCS
 325         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
 326 #endif
 327 #ifdef DLT_PPI
 328         { ppi_if_print,         DLT_PPI },
 329 #endif
 330 #ifdef DLT_NETANALYZER
 331         { netanalyzer_if_print, DLT_NETANALYZER },
 332 #endif
 333 #ifdef DLT_NETANALYZER_TRANSPARENT
 334         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
 335 #endif
 336         { NULL,                 0 },
 337 };
 338
 339 if_printer
 340 lookup_printer(int type)
 341 {
 342         struct printer *p;
 343
 344         for (p = printers; p->f; ++p)
 345                 if (type == p->type)
 346                         return p->f;
 347
 348         return NULL;
 349         /* NOTREACHED */
 350 }
 351
 352 if_ndo_printer
 353 lookup_ndo_printer(int type)
 354 {
 355         struct ndo_printer *p;
 356
 357         for (p = ndo_printers; p->f; ++p)
 358                 if (type == p->type)
 359                         return p->f;
 360
 361         return NULL;
 362         /* NOTREACHED */
 363 }
 364
 365 static pcap_t *pd;
 366
 367 static int supports_monitor_mode;
 368
 369 extern int optind;
 370 extern int opterr;
 371 extern char *optarg;
 372
 373 struct print_info {
 374         netdissect_options *ndo;
 375         union {
 376                 if_printer     printer;
 377                 if_ndo_printer ndo_printer;
 378         } p;
 379         int ndo_type;
 380 };
 381
 382 struct dump_info {
 383         char    *WFileName;
 384         char    *CurrentFileName;
 385         pcap_t  *pd;
 386         pcap_dumper_t *p;
 387 };
 388
 389 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 390 static void
 391 show_tstamp_types_and_exit(const char *device, pcap_t *pd)
 392 {
 393         int n_tstamp_types;
 394         int *tstamp_types = 0;
 395         const char *tstamp_type_name;
 396         int i;
 397
 398         n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
 399         if (n_tstamp_types < 0)
 400                 error("%s", pcap_geterr(pd));
 401
 402         if (n_tstamp_types == 0) {
 403                 fprintf(stderr, "Time stamp type cannot be set for %s\n",
 404                     device);
 405                 exit(0);
 406         }
 407         fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
 408             device);
 409         for (i = 0; i < n_tstamp_types; i++) {
 410                 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
 411                 if (tstamp_type_name != NULL) {
 412                         (void) fprintf(stderr, "  %s (%s)\n", tstamp_type_name,
 413                             pcap_tstamp_type_val_to_description(tstamp_types[i]));
 414                 } else {
 415                         (void) fprintf(stderr, "  %d\n", tstamp_types[i]);
 416                 }
 417         }
 418         pcap_free_tstamp_types(tstamp_types);
 419         exit(0);
 420 }
 421 #endif
 422
 423 static void
 424 show_dlts_and_exit(const char *device, pcap_t *pd)
 425 {
 426         int n_dlts;
 427         int *dlts = 0;
 428         const char *dlt_name;
 429
 430         n_dlts = pcap_list_datalinks(pd, &dlts);
 431         if (n_dlts < 0)
 432                 error("%s", pcap_geterr(pd));
 433         else if (n_dlts == 0 || !dlts)
 434                 error("No data link types.");
 435
 436         /*
 437          * If the interface is known to support monitor mode, indicate
 438          * whether these are the data link types available when not in
 439          * monitor mode, if -I wasn't specified, or when in monitor mode,
 440          * when -I was specified (the link-layer types available in
 441          * monitor mode might be different from the ones available when
 442          * not in monitor mode).
 443          */
 444         if (supports_monitor_mode)
 445                 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
 446                     device,
 447                     Iflag ? "when in monitor mode" : "when not in monitor mode");
 448         else
 449                 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
 450                     device);
 451
 452         while (--n_dlts >= 0) {
 453                 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
 454                 if (dlt_name != NULL) {
 455                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
 456                             pcap_datalink_val_to_description(dlts[n_dlts]));
 457
 458                         /*
 459                          * OK, does tcpdump handle that type?
 460                          */
 461                         if (lookup_printer(dlts[n_dlts]) == NULL
 462                             && lookup_ndo_printer(dlts[n_dlts]) == NULL)
 463                                 (void) fprintf(stderr, " (printing not supported)");
 464                         fprintf(stderr, "\n");
 465                 } else {
 466                         (void) fprintf(stderr, "  DLT %d (printing not supported)\n",
 467                             dlts[n_dlts]);
 468                 }
 469         }
 470 #ifdef HAVE_PCAP_FREE_DATALINKS
 471         pcap_free_datalinks(dlts);
 472 #endif
 473         exit(0);
 474 }
 475
 476 /*
 477  * Set up flags that might or might not be supported depending on the
 478  * version of libpcap we're using.
 479  */
 480 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
 481 #define B_FLAG          "B:"
 482 #define B_FLAG_USAGE    " [ -B size ]"
 483 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
 484 #define B_FLAG
 485 #define B_FLAG_USAGE
 486 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
 487
 488 #ifdef HAVE_PCAP_CREATE
 489 #define I_FLAG          "I"
 490 #else /* HAVE_PCAP_CREATE */
 491 #define I_FLAG
 492 #endif /* HAVE_PCAP_CREATE */
 493
 494 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 495 #define j_FLAG          "j:"
 496 #define j_FLAG_USAGE    " [ -j tstamptype ]"
 497 #define J_FLAG          "J"
 498 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
 499 #define j_FLAG
 500 #define j_FLAG_USAGE
 501 #define J_FLAG
 502 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
 503
 504 #ifdef HAVE_PCAP_FINDALLDEVS
 505 #ifndef HAVE_PCAP_IF_T
 506 #undef HAVE_PCAP_FINDALLDEVS
 507 #endif
 508 #endif
 509
 510 #ifdef HAVE_PCAP_FINDALLDEVS
 511 #define D_FLAG  "D"
 512 #else
 513 #define D_FLAG
 514 #endif
 515
 516 #ifdef HAVE_PCAP_DUMP_FLUSH
 517 #define U_FLAG  "U"
 518 #else
 519 #define U_FLAG
 520 #endif
 521
 522 #ifndef WIN32
 523 /* Drop root privileges and chroot if necessary */
 524 static void
 525 droproot(const char *username, const char *chroot_dir)
 526 {
 527         struct passwd *pw = NULL;
 528
 529         if (chroot_dir && !username) {
 530                 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
 531                 exit(1);
 532         }
 533
 534         pw = getpwnam(username);
 535         if (pw) {
 536                 if (chroot_dir) {
 537                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
 538                                 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
 539                                     chroot_dir, pcap_strerror(errno));
 540                                 exit(1);
 541                         }
 542                 }
 543 #ifdef HAVE_CAP_NG_H
 544                 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
 545                 if (ret < 0) {
 546                         printf("error : ret %d\n", ret);
 547                 }
 548                 /* We don't need CAP_SETUID and CAP_SETGID */
 549                 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
 550                 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
 551                 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
 552                 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
 553                 capng_apply(CAPNG_SELECT_BOTH);
 554
 555 #else
 556                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
 557                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
 558                         fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
 559                             username,
 560                             (unsigned long)pw->pw_uid,
 561                             (unsigned long)pw->pw_gid,
 562                             pcap_strerror(errno));
 563                         exit(1);
 564                 }
 565 #endif /* HAVE_CAP_NG_H */
 566         }
 567         else {
 568                 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
 569                     username);
 570                 exit(1);
 571         }
 572 }
 573 #endif /* WIN32 */
 574
 575 static int
 576 getWflagChars(int x)
 577 {
 578         int c = 0;
 579
 580         x -= 1;
 581         while (x > 0) {
 582                 c += 1;
 583                 x /= 10;
 584         }
 585
 586         return c;
 587 }
 588
 589
 590 static void
 591 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
 592 {
 593         char *filename = malloc(PATH_MAX + 1);
 594         if (filename == NULL)
 595             error("Makefilename: malloc");
 596
 597         /* Process with strftime if Gflag is set. */
 598         if (Gflag != 0) {
 599           struct tm *local_tm;
 600
 601           /* Convert Gflag_time to a usable format */
 602           if ((local_tm = localtime(&Gflag_time)) == NULL) {
 603                   error("MakeTimedFilename: localtime");
 604           }
 605
 606           /* There's no good way to detect an error in strftime since a return
 607            * value of 0 isn't necessarily failure.
 608            */
 609           strftime(filename, PATH_MAX, orig_name, local_tm);
 610         } else {
 611           strncpy(filename, orig_name, PATH_MAX);
 612         }
 613
 614         if (cnt == 0 && max_chars == 0)
 615                 strncpy(buffer, filename, PATH_MAX + 1);
 616         else
 617                 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
 618                   /* Report an error if the filename is too large */
 619                   error("too many output files or filename is too long (> %d)", PATH_MAX);
 620         free(filename);
 621 }
 622
 623 static int tcpdump_printf(netdissect_options *ndo _U_,
 624                           const char *fmt, ...)
 625 {
 626
 627   va_list args;
 628   int ret;
 629
 630   va_start(args, fmt);
 631   ret=vfprintf(stdout, fmt, args);
 632   va_end(args);
 633
 634   return ret;
 635 }
 636
 637 static struct print_info
 638 get_print_info(int type)
 639 {
 640         struct print_info printinfo;
 641
 642         printinfo.ndo_type = 1;
 643         printinfo.ndo = gndo;
 644         printinfo.p.ndo_printer = lookup_ndo_printer(type);
 645         if (printinfo.p.ndo_printer == NULL) {
 646                 printinfo.p.printer = lookup_printer(type);
 647                 printinfo.ndo_type = 0;
 648                 if (printinfo.p.printer == NULL) {
 649                         gndo->ndo_dltname = pcap_datalink_val_to_name(type);
 650                         if (gndo->ndo_dltname != NULL)
 651                                 error("packet printing is not supported for link type %s: use -w",
 652                                       gndo->ndo_dltname);
 653                         else
 654                                 error("packet printing is not supported for link type %d: use -w", type);
 655                 }
 656         }
 657         return (printinfo);
 658 }
 659
 660 static char *
 661 get_next_file(FILE *VFile, char *ptr)
 662 {
 663         char *ret;
 664
 665         ret = fgets(ptr, PATH_MAX, VFile);
 666         if (!ret)
 667                 return NULL;
 668
 669         if (ptr[strlen(ptr) - 1] == '\n')
 670                 ptr[strlen(ptr) - 1] = '\0';
 671
 672         return ret;
 673 }
 674
 675 int
 676 main(int argc, char **argv)
 677 {
 678         register int cnt, op, i;
 679         bpf_u_int32 localnet, netmask;
 680         register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
 681         pcap_handler callback;
 682         int type;
 683         int dlt;
 684         int new_dlt;
 685         const char *dlt_name;
 686         struct bpf_program fcode;
 687 #ifndef WIN32
 688         RETSIGTYPE (*oldhandler)(int);
 689 #endif
 690         struct print_info printinfo;
 691         struct dump_info dumpinfo;
 692         u_char *pcap_userdata;
 693         char ebuf[PCAP_ERRBUF_SIZE];
 694         char VFileLine[PATH_MAX + 1];
 695         char *username = NULL;
 696         char *chroot_dir = NULL;
 697         char *ret = NULL;
 698         char *end;
 699 #ifdef HAVE_PCAP_FINDALLDEVS
 700         pcap_if_t *devpointer;
 701         int devnum;
 702 #endif
 703         int status;
 704         FILE *VFile;
 705 #ifdef WIN32
 706         if(wsockinit() != 0) return 1;
 707 #endif /* WIN32 */
 708
 709         jflag=-1;       /* not set */
 710         gndo->ndo_Oflag=1;
 711         gndo->ndo_Rflag=1;
 712         gndo->ndo_dlt=-1;
 713         gndo->ndo_default_print=ndo_default_print;
 714         gndo->ndo_printf=tcpdump_printf;
 715         gndo->ndo_error=ndo_error;
 716         gndo->ndo_warning=ndo_warning;
 717         gndo->ndo_snaplen = DEFAULT_SNAPLEN;
 718
 719         cnt = -1;
 720         device = NULL;
 721         infile = NULL;
 722         RFileName = NULL;
 723         VFileName = NULL;
 724         VFile = NULL;
 725         WFileName = NULL;
 726         dlt = -1;
 727         if ((cp = strrchr(argv[0], '/')) != NULL)
 728                 program_name = cp + 1;
 729         else
 730                 program_name = argv[0];
 731
 732         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
 733                 error("%s", ebuf);
 734
 735 #ifdef LIBSMI
 736         smiInit("tcpdump");
 737 #endif
 738
 739         while (
 740             (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "V:vw:W:xXy:Yz:Z:")) != -1)
 741                 switch (op) {
 742
 743                 case 'a':
 744                         /* compatibility for old -a */
 745                         break;
 746
 747                 case 'A':
 748                         ++Aflag;
 749                         break;
 750
 751                 case 'b':
 752                         ++bflag;
 753                         break;
 754
 755 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
 756                 case 'B':
 757                         Bflag = atoi(optarg)*1024;
 758                         if (Bflag <= 0)
 759                                 error("invalid packet buffer size %s", optarg);
 760                         break;
 761 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
 762
 763                 case 'c':
 764                         cnt = atoi(optarg);
 765                         if (cnt <= 0)
 766                                 error("invalid packet count %s", optarg);
 767                         break;
 768
 769                 case 'C':
 770                         Cflag = atoi(optarg) * 1000000;
 771                         if (Cflag < 0)
 772                                 error("invalid file size %s", optarg);
 773                         break;
 774
 775                 case 'd':
 776                         ++dflag;
 777                         break;
 778
 779 #ifdef HAVE_PCAP_FINDALLDEVS
 780                 case 'D':
 781                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
 782                                 error("%s", ebuf);
 783                         else {
 784                                 for (i = 0; devpointer != 0; i++) {
 785                                         printf("%d.%s", i+1, devpointer->name);
 786                                         if (devpointer->description != NULL)
 787                                                 printf(" (%s)", devpointer->description);
 788                                         printf("\n");
 789                                         devpointer = devpointer->next;
 790                                 }
 791                         }
 792                         return 0;
 793 #endif /* HAVE_PCAP_FINDALLDEVS */
 794
 795                 case 'L':
 796                         Lflag++;
 797                         break;
 798
 799                 case 'e':
 800                         ++eflag;
 801                         break;
 802
 803                 case 'E':
 804 #ifndef HAVE_LIBCRYPTO
 805                         warning("crypto code not compiled in");
 806 #endif
 807                         gndo->ndo_espsecret = optarg;
 808                         break;
 809
 810                 case 'f':
 811                         ++fflag;
 812                         break;
 813
 814                 case 'F':
 815                         infile = optarg;
 816                         break;
 817
 818                 case 'G':
 819                         Gflag = atoi(optarg);
 820                         if (Gflag < 0)
 821                                 error("invalid number of seconds %s", optarg);
 822
 823                         /* We will create one file initially. */
 824                         Gflag_count = 0;
 825
 826                         /* Grab the current time for rotation use. */
 827                         if ((Gflag_time = time(NULL)) == (time_t)-1) {
 828                                 error("main: can't get current time: %s",
 829                                     pcap_strerror(errno));
 830                         }
 831                         break;
 832
 833                 case 'h':
 834                         usage();
 835                         break;
 836
 837                 case 'H':
 838                         ++Hflag;
 839                         break;
 840
 841                 case 'i':
 842                         if (optarg[0] == '0' && optarg[1] == 0)
 843                                 error("Invalid adapter index");
 844
 845 #ifdef HAVE_PCAP_FINDALLDEVS
 846                         /*
 847                          * If the argument is a number, treat it as
 848                          * an index into the list of adapters, as
 849                          * printed by "tcpdump -D".
 850                          *
 851                          * This should be OK on UNIX systems, as interfaces
 852                          * shouldn't have names that begin with digits.
 853                          * It can be useful on Windows, where more than
 854                          * one interface can have the same name.
 855                          */
 856                         devnum = strtol(optarg, &end, 10);
 857                         if (optarg != end && *end == '\0') {
 858                                 if (devnum < 0)
 859                                         error("Invalid adapter index");
 860
 861                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
 862                                         error("%s", ebuf);
 863                                 else {
 864                                         /*
 865                                          * Look for the devnum-th entry
 866                                          * in the list of devices
 867                                          * (1-based).
 868                                          */
 869                                         for (i = 0;
 870                                             i < devnum-1 && devpointer != NULL;
 871                                             i++, devpointer = devpointer->next)
 872                                                 ;
 873                                         if (devpointer == NULL)
 874                                                 error("Invalid adapter index");
 875                                 }
 876                                 device = devpointer->name;
 877                                 break;
 878                         }
 879 #endif /* HAVE_PCAP_FINDALLDEVS */
 880                         device = optarg;
 881                         break;
 882
 883 #ifdef HAVE_PCAP_CREATE
 884                 case 'I':
 885                         ++Iflag;
 886                         break;
 887 #endif /* HAVE_PCAP_CREATE */
 888
 889 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 890                 case 'j':
 891                         jflag = pcap_tstamp_type_name_to_val(optarg);
 892                         if (jflag < 0)
 893                                 error("invalid time stamp type %s", optarg);
 894                         break;
 895
 896                 case 'J':
 897                         Jflag++;
 898                         break;
 899 #endif
 900
 901                 case 'l':
 902 #ifdef WIN32
 903                         /*
 904                          * _IOLBF is the same as _IOFBF in Microsoft's C
 905                          * libraries; the only alternative they offer
 906                          * is _IONBF.
 907                          *
 908                          * XXX - this should really be checking for MSVC++,
 909                          * not WIN32, if, for example, MinGW has its own
 910                          * C library that is more UNIX-compatible.
 911                          */
 912                         setvbuf(stdout, NULL, _IONBF, 0);
 913 #else /* WIN32 */
 914 #ifdef HAVE_SETLINEBUF
 915                         setlinebuf(stdout);
 916 #else
 917                         setvbuf(stdout, NULL, _IOLBF, 0);
 918 #endif
 919 #endif /* WIN32 */
 920                         break;
 921
 922                 case 'K':
 923                         ++Kflag;
 924                         break;
 925
 926                 case 'm':
 927 #ifdef LIBSMI
 928                         if (smiLoadModule(optarg) == 0) {
 929                                 error("could not load MIB module %s", optarg);
 930                         }
 931                         sflag = 1;
 932 #else
 933                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
 934                                       program_name, optarg);
 935                         (void)fprintf(stderr, "(no libsmi support)\n");
 936 #endif
 937                         break;
 938
 939                 case 'M':
 940                         /* TCP-MD5 shared secret */
 941 #ifndef HAVE_LIBCRYPTO
 942                         warning("crypto code not compiled in");
 943 #endif
 944                         sigsecret = optarg;
 945                         break;
 946
 947                 case 'n':
 948                         ++nflag;
 949                         break;
 950
 951                 case 'N':
 952                         ++Nflag;
 953                         break;
 954
 955                 case 'O':
 956                         Oflag = 0;
 957                         break;
 958
 959                 case 'p':
 960                         ++pflag;
 961                         break;
 962
 963                 case 'q':
 964                         ++qflag;
 965                         ++suppress_default_print;
 966                         break;
 967
 968                 case 'r':
 969                         RFileName = optarg;
 970                         break;
 971
 972                 case 'R':
 973                         Rflag = 0;
 974                         break;
 975
 976                 case 's':
 977                         snaplen = strtol(optarg, &end, 0);
 978                         if (optarg == end || *end != '\0'
 979                             || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
 980                                 error("invalid snaplen %s", optarg);
 981                         else if (snaplen == 0)
 982                                 snaplen = MAXIMUM_SNAPLEN;
 983                         break;
 984
 985                 case 'S':
 986                         ++Sflag;
 987                         break;
 988
 989                 case 't':
 990                         ++tflag;
 991                         break;
 992
 993                 case 'T':
 994                         if (strcasecmp(optarg, "vat") == 0)
 995                                 packettype = PT_VAT;
 996                         else if (strcasecmp(optarg, "wb") == 0)
 997                                 packettype = PT_WB;
 998                         else if (strcasecmp(optarg, "rpc") == 0)
 999                                 packettype = PT_RPC;
1000                         else if (strcasecmp(optarg, "rtp") == 0)
1001                                 packettype = PT_RTP;
1002                         else if (strcasecmp(optarg, "rtcp") == 0)
1003                                 packettype = PT_RTCP;
1004                         else if (strcasecmp(optarg, "snmp") == 0)
1005                                 packettype = PT_SNMP;
1006                         else if (strcasecmp(optarg, "cnfp") == 0)
1007                                 packettype = PT_CNFP;
1008                         else if (strcasecmp(optarg, "tftp") == 0)
1009                                 packettype = PT_TFTP;
1010                         else if (strcasecmp(optarg, "aodv") == 0)
1011                                 packettype = PT_AODV;
1012                         else if (strcasecmp(optarg, "carp") == 0)
1013                                 packettype = PT_CARP;
1014                         else if (strcasecmp(optarg, "radius") == 0)
1015                                 packettype = PT_RADIUS;
1016                         else if (strcasecmp(optarg, "zmtp1") == 0)
1017                                 packettype = PT_ZMTP1;
1018                         else if (strcasecmp(optarg, "vxlan") == 0)
1019                                 packettype = PT_VXLAN;
1020                         else
1021                                 error("unknown packet type `%s'", optarg);
1022                         break;
1023
1024                 case 'u':
1025                         ++uflag;
1026                         break;
1027
1028 #ifdef HAVE_PCAP_DUMP_FLUSH
1029                 case 'U':
1030                         ++Uflag;
1031                         break;
1032 #endif
1033
1034                 case 'v':
1035                         ++vflag;
1036                         break;
1037
1038                 case 'V':
1039                         VFileName = optarg;
1040                         break;
1041
1042                 case 'w':
1043                         WFileName = optarg;
1044                         break;
1045
1046                 case 'W':
1047                         Wflag = atoi(optarg);
1048                         if (Wflag < 0)
1049                                 error("invalid number of output files %s", optarg);
1050                         WflagChars = getWflagChars(Wflag);
1051                         break;
1052
1053                 case 'x':
1054                         ++xflag;
1055                         ++suppress_default_print;
1056                         break;
1057
1058                 case 'X':
1059                         ++Xflag;
1060                         ++suppress_default_print;
1061                         break;
1062
1063                 case 'y':
1064                         gndo->ndo_dltname = optarg;
1065                         gndo->ndo_dlt =
1066                           pcap_datalink_name_to_val(gndo->ndo_dltname);
1067                         if (gndo->ndo_dlt < 0)
1068                                 error("invalid data link type %s", gndo->ndo_dltname);
1069                         break;
1070
1071 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
1072                 case 'Y':
1073                         {
1074                         /* Undocumented flag */
1075 #ifdef HAVE_PCAP_DEBUG
1076                         extern int pcap_debug;
1077                         pcap_debug = 1;
1078 #else
1079                         extern int yydebug;
1080                         yydebug = 1;
1081 #endif
1082                         }
1083                         break;
1084 #endif
1085                 case 'z':
1086                         if (optarg) {
1087                                 zflag = strdup(optarg);
1088                         } else {
1089                                 usage();
1090                                 /* NOTREACHED */
1091                         }
1092                         break;
1093
1094                 case 'Z':
1095                         if (optarg) {
1096                                 username = strdup(optarg);
1097                         }
1098                         else {
1099                                 usage();
1100                                 /* NOTREACHED */
1101                         }
1102                         break;
1103
1104                 default:
1105                         usage();
1106                         /* NOTREACHED */
1107                 }
1108
1109         switch (tflag) {
1110
1111         case 0: /* Default */
1112         case 4: /* Default + Date*/
1113                 thiszone = gmt2local(0);
1114                 break;
1115
1116         case 1: /* No time stamp */
1117         case 2: /* Unix timeval style */
1118         case 3: /* Microseconds since previous packet */
1119         case 5: /* Microseconds since first packet */
1120                 break;
1121
1122         default: /* Not supported */
1123                 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1124                 break;
1125         }
1126
1127         if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
1128                 error("-f can not be used with -V or -r");
1129
1130         if (VFileName != NULL && RFileName != NULL)
1131                 error("-V and -r are mutually exclusive.");
1132
1133 #ifdef WITH_CHROOT
1134         /* if run as root, prepare for chrooting */
1135         if (getuid() == 0 || geteuid() == 0) {
1136                 /* future extensibility for cmd-line arguments */
1137                 if (!chroot_dir)
1138                         chroot_dir = WITH_CHROOT;
1139         }
1140 #endif
1141
1142 #ifdef WITH_USER
1143         /* if run as root, prepare for dropping root privileges */
1144         if (getuid() == 0 || geteuid() == 0) {
1145                 /* Run with '-Z root' to restore old behaviour */
1146                 if (!username)
1147                         username = WITH_USER;
1148         }
1149 #endif
1150
1151         if (RFileName != NULL || VFileName != NULL) {
1152                 /*
1153                  * If RFileName is non-null, it's the pathname of a
1154                  * savefile to read.  If VFileName is non-null, it's
1155                  * the pathname of a file containing a list of pathnames
1156                  * (one per line) of savefiles to read.
1157                  *
1158                  * In either case, we're reading a savefile, not doing
1159                  * a live capture.
1160                  */
1161 #ifndef WIN32
1162                 /*
1163                  * We don't need network access, so relinquish any set-UID
1164                  * or set-GID privileges we have (if any).
1165                  *
1166                  * We do *not* want set-UID privileges when opening a
1167                  * trace file, as that might let the user read other
1168                  * people's trace files (especially if we're set-UID
1169                  * root).
1170                  */
1171                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1172                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
1173 #endif /* WIN32 */
1174                 if (VFileName != NULL) {
1175                         if (VFileName[0] == '-' && VFileName[1] == '\0')
1176                                 VFile = stdin;
1177                         else
1178                                 VFile = fopen(VFileName, "r");
1179
1180                         if (VFile == NULL)
1181                                 error("Unable to open file: %s\n", strerror(errno));
1182
1183                         ret = get_next_file(VFile, VFileLine);
1184                         if (!ret)
1185                                 error("Nothing in %s\n", VFileName);
1186                         RFileName = VFileLine;
1187                 }
1188
1189                 pd = pcap_open_offline(RFileName, ebuf);
1190                 if (pd == NULL)
1191                         error("%s", ebuf);
1192                 dlt = pcap_datalink(pd);
1193                 dlt_name = pcap_datalink_val_to_name(dlt);
1194                 if (dlt_name == NULL) {
1195                         fprintf(stderr, "reading from file %s, link-type %u\n",
1196                             RFileName, dlt);
1197                 } else {
1198                         fprintf(stderr,
1199                             "reading from file %s, link-type %s (%s)\n",
1200                             RFileName, dlt_name,
1201                             pcap_datalink_val_to_description(dlt));
1202                 }
1203                 localnet = 0;
1204                 netmask = 0;
1205         } else {
1206                 /*
1207                  * We're doing a live capture.
1208                  */
1209                 if (device == NULL) {
1210                         device = pcap_lookupdev(ebuf);
1211                         if (device == NULL)
1212                                 error("%s", ebuf);
1213                 }
1214 #ifdef WIN32
1215                 /*
1216                  * Print a message to the standard error on Windows.
1217                  * XXX - why do it here, with a different message?
1218                  */
1219                 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1220                 {                                               //a Unicode string has a \0 as second byte (so strlen() is 1)
1221                         fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1222                 }
1223                 else
1224                 {
1225                         fprintf(stderr, "%s: listening on %s\n", program_name, device);
1226                 }
1227
1228                 fflush(stderr);
1229 #endif /* WIN32 */
1230 #ifdef HAVE_PCAP_CREATE
1231                 pd = pcap_create(device, ebuf);
1232                 if (pd == NULL)
1233                         error("%s", ebuf);
1234 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1235                 if (Jflag)
1236                         show_tstamp_types_and_exit(device, pd);
1237 #endif
1238                 /*
1239                  * Is this an interface that supports monitor mode?
1240                  */
1241                 if (pcap_can_set_rfmon(pd) == 1)
1242                         supports_monitor_mode = 1;
1243                 else
1244                         supports_monitor_mode = 0;
1245                 status = pcap_set_snaplen(pd, snaplen);
1246                 if (status != 0)
1247                         error("%s: Can't set snapshot length: %s",
1248                             device, pcap_statustostr(status));
1249                 status = pcap_set_promisc(pd, !pflag);
1250                 if (status != 0)
1251                         error("%s: Can't set promiscuous mode: %s",
1252                             device, pcap_statustostr(status));
1253                 if (Iflag) {
1254                         status = pcap_set_rfmon(pd, 1);
1255                         if (status != 0)
1256                                 error("%s: Can't set monitor mode: %s",
1257                                     device, pcap_statustostr(status));
1258                 }
1259                 status = pcap_set_timeout(pd, 1000);
1260                 if (status != 0)
1261                         error("%s: pcap_set_timeout failed: %s",
1262                             device, pcap_statustostr(status));
1263                 if (Bflag != 0) {
1264                         status = pcap_set_buffer_size(pd, Bflag);
1265                         if (status != 0)
1266                                 error("%s: Can't set buffer size: %s",
1267                                     device, pcap_statustostr(status));
1268                 }
1269 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1270                 if (jflag != -1) {
1271                         status = pcap_set_tstamp_type(pd, jflag);
1272                         if (status < 0)
1273                                 error("%s: Can't set time stamp type: %s",
1274                                     device, pcap_statustostr(status));
1275                 }
1276 #endif
1277                 status = pcap_activate(pd);
1278                 if (status < 0) {
1279                         /*
1280                          * pcap_activate() failed.
1281                          */
1282                         cp = pcap_geterr(pd);
1283                         if (status == PCAP_ERROR)
1284                                 error("%s", cp);
1285                         else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1286                                   status == PCAP_ERROR_PERM_DENIED) &&
1287                                  *cp != '\0')
1288                                 error("%s: %s\n(%s)", device,
1289                                     pcap_statustostr(status), cp);
1290                         else
1291                                 error("%s: %s", device,
1292                                     pcap_statustostr(status));
1293                 } else if (status > 0) {
1294                         /*
1295                          * pcap_activate() succeeded, but it's warning us
1296                          * of a problem it had.
1297                          */
1298                         cp = pcap_geterr(pd);
1299                         if (status == PCAP_WARNING)
1300                                 warning("%s", cp);
1301                         else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1302                                  *cp != '\0')
1303                                 warning("%s: %s\n(%s)", device,
1304                                     pcap_statustostr(status), cp);
1305                         else
1306                                 warning("%s: %s", device,
1307                                     pcap_statustostr(status));
1308                 }
1309 #else
1310                 *ebuf = '\0';
1311                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1312                 if (pd == NULL)
1313                         error("%s", ebuf);
1314                 else if (*ebuf)
1315                         warning("%s", ebuf);
1316 #endif /* HAVE_PCAP_CREATE */
1317                 /*
1318                  * Let user own process after socket has been opened.
1319                  */
1320 #ifndef WIN32
1321                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1322                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
1323 #endif /* WIN32 */
1324 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1325                 if(Bflag != 0)
1326                         if(pcap_setbuff(pd, Bflag)==-1){
1327                                 error("%s", pcap_geterr(pd));
1328                         }
1329 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1330                 if (Lflag)
1331                         show_dlts_and_exit(device, pd);
1332                 if (gndo->ndo_dlt >= 0) {
1333 #ifdef HAVE_PCAP_SET_DATALINK
1334                         if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1335                                 error("%s", pcap_geterr(pd));
1336 #else
1337                         /*
1338                          * We don't actually support changing the
1339                          * data link type, so we only let them
1340                          * set it to what it already is.
1341                          */
1342                         if (gndo->ndo_dlt != pcap_datalink(pd)) {
1343                                 error("%s is not one of the DLTs supported by this device\n",
1344                                       gndo->ndo_dltname);
1345                         }
1346 #endif
1347                         (void)fprintf(stderr, "%s: data link type %s\n",
1348                                       program_name, gndo->ndo_dltname);
1349                         (void)fflush(stderr);
1350                 }
1351                 i = pcap_snapshot(pd);
1352                 if (snaplen < i) {
1353                         warning("snaplen raised from %d to %d", snaplen, i);
1354                         snaplen = i;
1355                 }
1356                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1357                         localnet = 0;
1358                         netmask = 0;
1359                         warning("%s", ebuf);
1360                 }
1361         }
1362         if (infile)
1363                 cmdbuf = read_infile(infile);
1364         else
1365                 cmdbuf = copy_argv(&argv[optind]);
1366
1367         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1368                 error("%s", pcap_geterr(pd));
1369         if (dflag) {
1370                 bpf_dump(&fcode, dflag);
1371                 pcap_close(pd);
1372                 free(cmdbuf);
1373                 exit(0);
1374         }
1375         init_addrtoname(localnet, netmask);
1376         init_checksum();
1377
1378 #ifndef WIN32
1379         (void)setsignal(SIGPIPE, cleanup);
1380         (void)setsignal(SIGTERM, cleanup);
1381         (void)setsignal(SIGINT, cleanup);
1382 #endif /* WIN32 */
1383 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1384         (void)setsignal(SIGCHLD, child_cleanup);
1385 #endif
1386         /* Cooperate with nohup(1) */
1387 #ifndef WIN32
1388         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1389                 (void)setsignal(SIGHUP, oldhandler);
1390 #endif /* WIN32 */
1391
1392 #ifndef WIN32
1393         /*
1394          * If a user name was specified with "-Z", attempt to switch to
1395          * that user's UID.  This would probably be used with sudo,
1396          * to allow tcpdump to be run in a special restricted
1397          * account (if you just want to allow users to open capture
1398          * devices, and can't just give users that permission,
1399          * you'd make tcpdump set-UID or set-GID).
1400          *
1401          * Tcpdump doesn't necessarily write only to one savefile;
1402          * the general only way to allow a -Z instance to write to
1403          * savefiles as the user under whose UID it's run, rather
1404          * than as the user specified with -Z, would thus be to switch
1405          * to the original user ID before opening a capture file and
1406          * then switch back to the -Z user ID after opening the savefile.
1407          * Switching to the -Z user ID only after opening the first
1408          * savefile doesn't handle the general case.
1409          */
1410
1411 #ifdef HAVE_CAP_NG_H
1412         /* We are running as root and we will be writing to savefile */
1413         if ((getuid() == 0 || geteuid() == 0) && WFileName) {
1414                 if (username) {
1415                         /* Drop all capabilities from effective set */
1416                         capng_clear(CAPNG_EFFECTIVE);
1417                         /* Add capabilities we will need*/
1418                         capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
1419                         capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
1420                         capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
1421
1422                         capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
1423                         capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
1424                         capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1425
1426                         capng_apply(CAPNG_SELECT_BOTH);
1427                 }
1428         }
1429 #endif /* HAVE_CAP_NG_H */
1430
1431         if (getuid() == 0 || geteuid() == 0) {
1432                 if (username || chroot_dir)
1433                         droproot(username, chroot_dir);
1434
1435         }
1436 #endif /* WIN32 */
1437
1438         if (pcap_setfilter(pd, &fcode) < 0)
1439                 error("%s", pcap_geterr(pd));
1440         if (WFileName) {
1441                 pcap_dumper_t *p;
1442                 /* Do not exceed the default PATH_MAX for files. */
1443                 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1444
1445                 if (dumpinfo.CurrentFileName == NULL)
1446                         error("malloc of dumpinfo.CurrentFileName");
1447
1448                 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1449                 if (Cflag != 0)
1450                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1451                 else
1452                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1453
1454                 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1455 #ifdef HAVE_CAP_NG_H
1456         /* Give up capabilities, clear Effective set */
1457         capng_clear(CAPNG_EFFECTIVE);
1458 #endif
1459                 if (p == NULL)
1460                         error("%s", pcap_geterr(pd));
1461                 if (Cflag != 0 || Gflag != 0) {
1462                         callback = dump_packet_and_trunc;
1463                         dumpinfo.WFileName = WFileName;
1464                         dumpinfo.pd = pd;
1465                         dumpinfo.p = p;
1466                         pcap_userdata = (u_char *)&dumpinfo;
1467                 } else {
1468                         callback = dump_packet;
1469                         pcap_userdata = (u_char *)p;
1470                 }
1471 #ifdef HAVE_PCAP_DUMP_FLUSH
1472                 if (Uflag)
1473                         pcap_dump_flush(p);
1474 #endif
1475         } else {
1476                 type = pcap_datalink(pd);
1477                 printinfo = get_print_info(type);
1478                 callback = print_packet;
1479                 pcap_userdata = (u_char *)&printinfo;
1480         }
1481
1482 #ifdef SIGNAL_REQ_INFO
1483         /*
1484          * We can't get statistics when reading from a file rather
1485          * than capturing from a device.
1486          */
1487         if (RFileName == NULL)
1488                 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1489 #endif
1490
1491         if (vflag > 0 && WFileName) {
1492                 /*
1493                  * When capturing to a file, "-v" means tcpdump should,
1494                  * every 10 secodns, "v"erbosely report the number of
1495                  * packets captured.
1496                  */
1497 #ifdef USE_WIN32_MM_TIMER
1498                 /* call verbose_stats_dump() each 1000 +/-100msec */
1499                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1500                 setvbuf(stderr, NULL, _IONBF, 0);
1501 #elif defined(HAVE_ALARM)
1502                 (void)setsignal(SIGALRM, verbose_stats_dump);
1503                 alarm(1);
1504 #endif
1505         }
1506
1507 #ifndef WIN32
1508         if (RFileName == NULL) {
1509                 /*
1510                  * Live capture (if -V was specified, we set RFileName
1511                  * to a file from the -V file).  Print a message to
1512                  * the standard error on UN*X.
1513                  */
1514                 if (!vflag && !WFileName) {
1515                         (void)fprintf(stderr,
1516                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1517                             program_name);
1518                 } else
1519                         (void)fprintf(stderr, "%s: ", program_name);
1520                 dlt = pcap_datalink(pd);
1521                 dlt_name = pcap_datalink_val_to_name(dlt);
1522                 if (dlt_name == NULL) {
1523                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1524                             device, dlt, snaplen);
1525                 } else {
1526                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1527                             device, dlt_name,
1528                             pcap_datalink_val_to_description(dlt), snaplen);
1529                 }
1530                 (void)fflush(stderr);
1531         }
1532 #endif /* WIN32 */
1533         do {
1534                 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1535                 if (WFileName == NULL) {
1536                         /*
1537                          * We're printing packets.  Flush the printed output,
1538                          * so it doesn't get intermingled with error output.
1539                          */
1540                         if (status == -2) {
1541                                 /*
1542                                  * We got interrupted, so perhaps we didn't
1543                                  * manage to finish a line we were printing.
1544                                  * Print an extra newline, just in case.
1545                                  */
1546                                 putchar('\n');
1547                         }
1548                         (void)fflush(stdout);
1549                 }
1550                 if (status == -1) {
1551                         /*
1552                          * Error.  Report it.
1553                          */
1554                         (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1555                             program_name, pcap_geterr(pd));
1556                 }
1557                 if (RFileName == NULL) {
1558                         /*
1559                          * We're doing a live capture.  Report the capture
1560                          * statistics.
1561                          */
1562                         info(1);
1563                 }
1564                 pcap_close(pd);
1565                 if (VFileName != NULL) {
1566                         ret = get_next_file(VFile, VFileLine);
1567                         if (ret) {
1568                                 RFileName = VFileLine;
1569                                 pd = pcap_open_offline(RFileName, ebuf);
1570                                 if (pd == NULL)
1571                                         error("%s", ebuf);
1572                                 new_dlt = pcap_datalink(pd);
1573                                 if (WFileName && new_dlt != dlt)
1574                                         error("%s: new dlt does not match original", RFileName);
1575                                 printinfo = get_print_info(new_dlt);
1576                                 dlt_name = pcap_datalink_val_to_name(new_dlt);
1577                                 if (dlt_name == NULL) {
1578                                         fprintf(stderr, "reading from file %s, link-type %u\n",
1579                                         RFileName, new_dlt);
1580                                 } else {
1581                                         fprintf(stderr,
1582                                         "reading from file %s, link-type %s (%s)\n",
1583                                         RFileName, dlt_name,
1584                                         pcap_datalink_val_to_description(new_dlt));
1585                                 }
1586                                 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1587                                         error("%s", pcap_geterr(pd));
1588                                 if (pcap_setfilter(pd, &fcode) < 0)
1589                                         error("%s", pcap_geterr(pd));
1590                         }
1591                 }
1592         }
1593         while (ret != NULL);
1594
1595         free(cmdbuf);
1596         exit(status == -1 ? 1 : 0);
1597 }
1598
1599 /* make a clean exit on interrupts */
1600 static RETSIGTYPE
1601 cleanup(int signo _U_)
1602 {
1603 #ifdef USE_WIN32_MM_TIMER
1604         if (timer_id)
1605                 timeKillEvent(timer_id);
1606         timer_id = 0;
1607 #elif defined(HAVE_ALARM)
1608         alarm(0);
1609 #endif
1610
1611 #ifdef HAVE_PCAP_BREAKLOOP
1612         /*
1613          * We have "pcap_breakloop()"; use it, so that we do as little
1614          * as possible in the signal handler (it's probably not safe
1615          * to do anything with standard I/O streams in a signal handler -
1616          * the ANSI C standard doesn't say it is).
1617          */
1618         pcap_breakloop(pd);
1619 #else
1620         /*
1621          * We don't have "pcap_breakloop()"; this isn't safe, but
1622          * it's the best we can do.  Print the summary if we're
1623          * not reading from a savefile - i.e., if we're doing a
1624          * live capture - and exit.
1625          */
1626         if (pd != NULL && pcap_file(pd) == NULL) {
1627                 /*
1628                  * We got interrupted, so perhaps we didn't
1629                  * manage to finish a line we were printing.
1630                  * Print an extra newline, just in case.
1631                  */
1632                 putchar('\n');
1633                 (void)fflush(stdout);
1634                 info(1);
1635         }
1636         exit(0);
1637 #endif
1638 }
1639
1640 /*
1641   On windows, we do not use a fork, so we do not care less about
1642   waiting a child processes to die
1643  */
1644 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1645 static RETSIGTYPE
1646 child_cleanup(int signo _U_)
1647 {
1648   wait(NULL);
1649 }
1650 #endif /* HAVE_FORK && HAVE_VFORK */
1651
1652 static void
1653 info(register int verbose)
1654 {
1655         struct pcap_stat stat;
1656
1657         /*
1658          * Older versions of libpcap didn't set ps_ifdrop on some
1659          * platforms; initialize it to 0 to handle that.
1660          */
1661         stat.ps_ifdrop = 0;
1662         if (pcap_stats(pd, &stat) < 0) {
1663                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1664                 infoprint = 0;
1665                 return;
1666         }
1667
1668         if (!verbose)
1669                 fprintf(stderr, "%s: ", program_name);
1670
1671         (void)fprintf(stderr, "%u packet%s captured", packets_captured,
1672             PLURAL_SUFFIX(packets_captured));
1673         if (!verbose)
1674                 fputs(", ", stderr);
1675         else
1676                 putc('\n', stderr);
1677         (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
1678             PLURAL_SUFFIX(stat.ps_recv));
1679         if (!verbose)
1680                 fputs(", ", stderr);
1681         else
1682                 putc('\n', stderr);
1683         (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
1684             PLURAL_SUFFIX(stat.ps_drop));
1685         if (stat.ps_ifdrop != 0) {
1686                 if (!verbose)
1687                         fputs(", ", stderr);
1688                 else
1689                         putc('\n', stderr);
1690                 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
1691                     stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
1692         } else
1693                 putc('\n', stderr);
1694         infoprint = 0;
1695 }
1696
1697 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1698 static void
1699 compress_savefile(const char *filename)
1700 {
1701 # ifdef HAVE_FORK
1702         if (fork())
1703 # else
1704         if (vfork())
1705 # endif
1706                 return;
1707         /*
1708          * Set to lowest priority so that this doesn't disturb the capture
1709          */
1710 #ifdef NZERO
1711         setpriority(PRIO_PROCESS, 0, NZERO - 1);
1712 #else
1713         setpriority(PRIO_PROCESS, 0, 19);
1714 #endif
1715         if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1716                 fprintf(stderr,
1717                         "compress_savefile:execlp(%s, %s): %s\n",
1718                         zflag,
1719                         filename,
1720                         strerror(errno));
1721 # ifdef HAVE_FORK
1722         exit(1);
1723 # else
1724         _exit(1);
1725 # endif
1726 }
1727 #else  /* HAVE_FORK && HAVE_VFORK */
1728 static void
1729 compress_savefile(const char *filename)
1730 {
1731         fprintf(stderr,
1732                 "compress_savefile failed. Functionality not implemented under your system\n");
1733 }
1734 #endif /* HAVE_FORK && HAVE_VFORK */
1735
1736 static void
1737 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1738 {
1739         struct dump_info *dump_info;
1740
1741         ++packets_captured;
1742
1743         ++infodelay;
1744
1745         dump_info = (struct dump_info *)user;
1746
1747         /*
1748          * XXX - this won't force the file to rotate on the specified time
1749          * boundary, but it will rotate on the first packet received after the
1750          * specified Gflag number of seconds. Note: if a Gflag time boundary
1751          * and a Cflag size boundary coincide, the time rotation will occur
1752          * first thereby cancelling the Cflag boundary (since the file should
1753          * be 0).
1754          */
1755         if (Gflag != 0) {
1756                 /* Check if it is time to rotate */
1757                 time_t t;
1758
1759                 /* Get the current time */
1760                 if ((t = time(NULL)) == (time_t)-1) {
1761                         error("dump_and_trunc_packet: can't get current_time: %s",
1762                             pcap_strerror(errno));
1763                 }
1764
1765
1766                 /* If the time is greater than the specified window, rotate */
1767                 if (t - Gflag_time >= Gflag) {
1768                         /* Update the Gflag_time */
1769                         Gflag_time = t;
1770                         /* Update Gflag_count */
1771                         Gflag_count++;
1772                         /*
1773                          * Close the current file and open a new one.
1774                          */
1775                         pcap_dump_close(dump_info->p);
1776
1777                         /*
1778                          * Compress the file we just closed, if the user asked for it
1779                          */
1780                         if (zflag != NULL)
1781                                 compress_savefile(dump_info->CurrentFileName);
1782
1783                         /*
1784                          * Check to see if we've exceeded the Wflag (when
1785                          * not using Cflag).
1786                          */
1787                         if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1788                                 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1789                                     Wflag);
1790                                 exit(0);
1791                                 /* NOTREACHED */
1792                         }
1793                         if (dump_info->CurrentFileName != NULL)
1794                                 free(dump_info->CurrentFileName);
1795                         /* Allocate space for max filename + \0. */
1796                         dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1797                         if (dump_info->CurrentFileName == NULL)
1798                                 error("dump_packet_and_trunc: malloc");
1799                         /*
1800                          * This is always the first file in the Cflag
1801                          * rotation: e.g. 0
1802                          * We also don't need numbering if Cflag is not set.
1803                          */
1804                         if (Cflag != 0)
1805                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1806                                     WflagChars);
1807                         else
1808                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1809
1810 #ifdef HAVE_CAP_NG_H
1811                         capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1812                         capng_apply(CAPNG_EFFECTIVE);
1813 #endif /* HAVE_CAP_NG_H */
1814                         dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1815 #ifdef HAVE_CAP_NG_H
1816                         capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1817                         capng_apply(CAPNG_EFFECTIVE);
1818 #endif /* HAVE_CAP_NG_H */
1819                         if (dump_info->p == NULL)
1820                                 error("%s", pcap_geterr(pd));
1821                 }
1822         }
1823
1824         /*
1825          * XXX - this won't prevent capture files from getting
1826          * larger than Cflag - the last packet written to the
1827          * file could put it over Cflag.
1828          */
1829         if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1830                 /*
1831                  * Close the current file and open a new one.
1832                  */
1833                 pcap_dump_close(dump_info->p);
1834
1835                 /*
1836                  * Compress the file we just closed, if the user asked for it
1837                  */
1838                 if (zflag != NULL)
1839                         compress_savefile(dump_info->CurrentFileName);
1840
1841                 Cflag_count++;
1842                 if (Wflag > 0) {
1843                         if (Cflag_count >= Wflag)
1844                                 Cflag_count = 0;
1845                 }
1846                 if (dump_info->CurrentFileName != NULL)
1847                         free(dump_info->CurrentFileName);
1848                 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1849                 if (dump_info->CurrentFileName == NULL)
1850                         error("dump_packet_and_trunc: malloc");
1851                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1852                 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1853                 if (dump_info->p == NULL)
1854                         error("%s", pcap_geterr(pd));
1855         }
1856
1857         pcap_dump((u_char *)dump_info->p, h, sp);
1858 #ifdef HAVE_PCAP_DUMP_FLUSH
1859         if (Uflag)
1860                 pcap_dump_flush(dump_info->p);
1861 #endif
1862
1863         --infodelay;
1864         if (infoprint)
1865                 info(0);
1866 }
1867
1868 static void
1869 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1870 {
1871         ++packets_captured;
1872
1873         ++infodelay;
1874
1875         pcap_dump(user, h, sp);
1876 #ifdef HAVE_PCAP_DUMP_FLUSH
1877         if (Uflag)
1878                 pcap_dump_flush((pcap_dumper_t *)user);
1879 #endif
1880
1881         --infodelay;
1882         if (infoprint)
1883                 info(0);
1884 }
1885
1886 static void
1887 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1888 {
1889         struct print_info *print_info;
1890         u_int hdrlen;
1891
1892         ++packets_captured;
1893
1894         ++infodelay;
1895         ts_print(&h->ts);
1896
1897         print_info = (struct print_info *)user;
1898
1899         /*
1900          * Some printers want to check that they're not walking off the
1901          * end of the packet.
1902          * Rather than pass it all the way down, we set this global.
1903          */
1904         snapend = sp + h->caplen;
1905
1906         if(print_info->ndo_type) {
1907                 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1908         } else {
1909                 hdrlen = (*print_info->p.printer)(h, sp);
1910         }
1911
1912         if (Xflag) {
1913                 /*
1914                  * Print the raw packet data in hex and ASCII.
1915                  */
1916                 if (Xflag > 1) {
1917                         /*
1918                          * Include the link-layer header.
1919                          */
1920                         hex_and_ascii_print("\n\t", sp, h->caplen);
1921                 } else {
1922                         /*
1923                          * Don't include the link-layer header - and if
1924                          * we have nothing past the link-layer header,
1925                          * print nothing.
1926                          */
1927                         if (h->caplen > hdrlen)
1928                                 hex_and_ascii_print("\n\t", sp + hdrlen,
1929                                     h->caplen - hdrlen);
1930                 }
1931         } else if (xflag) {
1932                 /*
1933                  * Print the raw packet data in hex.
1934                  */
1935                 if (xflag > 1) {
1936                         /*
1937                          * Include the link-layer header.
1938                          */
1939                         hex_print("\n\t", sp, h->caplen);
1940                 } else {
1941                         /*
1942                          * Don't include the link-layer header - and if
1943                          * we have nothing past the link-layer header,
1944                          * print nothing.
1945                          */
1946                         if (h->caplen > hdrlen)
1947                                 hex_print("\n\t", sp + hdrlen,
1948                                     h->caplen - hdrlen);
1949                 }
1950         } else if (Aflag) {
1951                 /*
1952                  * Print the raw packet data in ASCII.
1953                  */
1954                 if (Aflag > 1) {
1955                         /*
1956                          * Include the link-layer header.
1957                          */
1958                         ascii_print(sp, h->caplen);
1959                 } else {
1960                         /*
1961                          * Don't include the link-layer header - and if
1962                          * we have nothing past the link-layer header,
1963                          * print nothing.
1964                          */
1965                         if (h->caplen > hdrlen)
1966                                 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1967                 }
1968         }
1969
1970         putchar('\n');
1971
1972         --infodelay;
1973         if (infoprint)
1974                 info(0);
1975 }
1976
1977 #ifdef WIN32
1978         /*
1979          * XXX - there should really be libpcap calls to get the version
1980          * number as a string (the string would be generated from #defines
1981          * at run time, so that it's not generated from string constants
1982          * in the library, as, on many UNIX systems, those constants would
1983          * be statically linked into the application executable image, and
1984          * would thus reflect the version of libpcap on the system on
1985          * which the application was *linked*, not the system on which it's
1986          * *running*.
1987          *
1988          * That routine should be documented, unlike the "version[]"
1989          * string, so that UNIX vendors providing their own libpcaps
1990          * don't omit it (as a couple of vendors have...).
1991          *
1992          * Packet.dll should perhaps also export a routine to return the
1993          * version number of the Packet.dll code, to supply the
1994          * "Wpcap_version" information on Windows.
1995          */
1996         char WDversion[]="current-cvs.tcpdump.org";
1997 #if !defined(HAVE_GENERATED_VERSION)
1998         char version[]="current-cvs.tcpdump.org";
1999 #endif
2000         char pcap_version[]="current-cvs.tcpdump.org";
2001         char Wpcap_version[]="3.1";
2002 #endif
2003
2004 /*
2005  * By default, print the specified data out in hex and ASCII.
2006  */
2007 static void
2008 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
2009 {
2010         hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
2011 }
2012
2013 void
2014 default_print(const u_char *bp, u_int length)
2015 {
2016         ndo_default_print(gndo, bp, length);
2017 }
2018
2019 #ifdef SIGNAL_REQ_INFO
2020 RETSIGTYPE requestinfo(int signo _U_)
2021 {
2022         if (infodelay)
2023                 ++infoprint;
2024         else
2025                 info(0);
2026 }
2027 #endif
2028
2029 /*
2030  * Called once each second in verbose mode while dumping to file
2031  */
2032 #ifdef USE_WIN32_MM_TIMER
2033 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2034                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2035 {
2036         struct pcap_stat stat;
2037
2038         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2039                 fprintf(stderr, "Got %u\r", packets_captured);
2040 }
2041 #elif defined(HAVE_ALARM)
2042 static void verbose_stats_dump(int sig _U_)
2043 {
2044         struct pcap_stat stat;
2045
2046         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2047                 fprintf(stderr, "Got %u\r", packets_captured);
2048         alarm(1);
2049 }
2050 #endif
2051
2052 static void
2053 usage(void)
2054 {
2055         extern char version[];
2056 #ifndef HAVE_PCAP_LIB_VERSION
2057 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
2058         extern char pcap_version[];
2059 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2060         static char pcap_version[] = "unknown";
2061 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2062 #endif /* HAVE_PCAP_LIB_VERSION */
2063
2064 #ifdef HAVE_PCAP_LIB_VERSION
2065 #ifdef WIN32
2066         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2067 #else /* WIN32 */
2068         (void)fprintf(stderr, "%s version %s\n", program_name, version);
2069 #endif /* WIN32 */
2070         (void)fprintf(stderr, "%s\n",pcap_lib_version());
2071 #else /* HAVE_PCAP_LIB_VERSION */
2072 #ifdef WIN32
2073         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2074         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2075 #else /* WIN32 */
2076         (void)fprintf(stderr, "%s version %s\n", program_name, version);
2077         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2078 #endif /* WIN32 */
2079 #endif /* HAVE_PCAP_LIB_VERSION */
2080         (void)fprintf(stderr,
2081 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2082         (void)fprintf(stderr,
2083 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2084         (void)fprintf(stderr,
2085 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
2086         (void)fprintf(stderr,
2087 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n");
2088         (void)fprintf(stderr,
2089 "\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
2090         (void)fprintf(stderr,
2091 "\t\t[ -Z user ] [ expression ]\n");
2092         exit(1);
2093 }
2094
2095
2096
2097 /* VARARGS */
2098 static void
2099 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
2100 {
2101         va_list ap;
2102
2103         (void)fprintf(stderr, "%s: ", program_name);
2104         va_start(ap, fmt);
2105         (void)vfprintf(stderr, fmt, ap);
2106         va_end(ap);
2107         if (*fmt) {
2108                 fmt += strlen(fmt);
2109                 if (fmt[-1] != '\n')
2110                         (void)fputc('\n', stderr);
2111         }
2112         exit(1);
2113         /* NOTREACHED */
2114 }
2115
2116 /* VARARGS */
2117 static void
2118 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
2119 {
2120         va_list ap;
2121
2122         (void)fprintf(stderr, "%s: WARNING: ", program_name);
2123         va_start(ap, fmt);
2124         (void)vfprintf(stderr, fmt, ap);
2125         va_end(ap);
2126         if (*fmt) {
2127                 fmt += strlen(fmt);
2128                 if (fmt[-1] != '\n')
2129                         (void)fputc('\n', stderr);
2130         }
2131 }