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 #endif
  33
  34 /*
  35  * tcpdump - dump traffic on a network
  36  *
  37  * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
  38  * Mercilessly hacked and occasionally improved since then via the
  39  * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
  40  */
  41
  42 #ifdef HAVE_CONFIG_H
  43 #include "config.h"
  44 #endif
  45
  46 /*
  47  * Mac OS X may ship pcap.h from libpcap 0.6 with a libpcap based on
  48  * 0.8.  That means it has pcap_findalldevs() but the header doesn't
  49  * define pcap_if_t, meaning that we can't actually *use* pcap_findalldevs().
  50  */
  51 #ifdef HAVE_PCAP_FINDALLDEVS
  52 #ifndef HAVE_PCAP_IF_T
  53 #undef HAVE_PCAP_FINDALLDEVS
  54 #endif
  55 #endif
  56
  57 #include <netdissect-stdinc.h>
  58
  59 #include <sys/stat.h>
  60
  61 #ifdef HAVE_FCNTL_H
  62 #include <fcntl.h>
  63 #endif
  64
  65 #ifdef HAVE_LIBCRYPTO
  66 #include <openssl/crypto.h>
  67 #endif
  68
  69 #ifdef HAVE_GETOPT_LONG
  70 #include <getopt.h>
  71 #else
  72 #include "getopt_long.h"
  73 #endif
  74 /* Capsicum-specific code requires macros from <net/bpf.h>, which will fail
  75  * to compile if <pcap.h> has already been included; including the headers
  76  * in the opposite order works fine.
  77  */
  78 #ifdef HAVE_CAPSICUM
  79 #include <sys/capability.h>
  80 #include <sys/ioccom.h>
  81 #include <net/bpf.h>
  82 #include <libgen.h>
  83 #endif  /* HAVE_CAPSICUM */
  84 #include <pcap.h>
  85 #include <signal.h>
  86 #include <stdio.h>
  87 #include <stdarg.h>
  88 #include <stdlib.h>
  89 #include <string.h>
  90 #include <limits.h>
  91 #ifndef _WIN32
  92 #include <sys/wait.h>
  93 #include <sys/resource.h>
  94 #include <pwd.h>
  95 #include <grp.h>
  96 #endif /* _WIN32 */
  97
  98 /* capabilities convenience library */
  99 /* If a code depends on HAVE_LIBCAP_NG, it depends also on HAVE_CAP_NG_H.
 100  * If HAVE_CAP_NG_H is not defined, undefine HAVE_LIBCAP_NG.
 101  * Thus, the later tests are done only on HAVE_LIBCAP_NG.
 102  */
 103 #ifdef HAVE_LIBCAP_NG
 104 #ifdef HAVE_CAP_NG_H
 105 #include <cap-ng.h>
 106 #else
 107 #undef HAVE_LIBCAP_NG
 108 #endif /* HAVE_CAP_NG_H */
 109 #endif /* HAVE_LIBCAP_NG */
 110
 111 #include "netdissect.h"
 112 #include "interface.h"
 113 #include "addrtoname.h"
 114 #include "machdep.h"
 115 #include "setsignal.h"
 116 #include "gmt2local.h"
 117 #include "pcap-missing.h"
 118 #include "ascii_strcasecmp.h"
 119
 120 #include "print.h"
 121
 122 #ifndef PATH_MAX
 123 #define PATH_MAX 1024
 124 #endif
 125
 126 #ifdef SIGINFO
 127 #define SIGNAL_REQ_INFO SIGINFO
 128 #elif SIGUSR1
 129 #define SIGNAL_REQ_INFO SIGUSR1
 130 #endif
 131
 132 static int Bflag;                       /* buffer size */
 133 static long Cflag;                      /* rotate dump files after this many bytes */
 134 static int Cflag_count;                 /* Keep track of which file number we're writing */
 135 static int Dflag;                       /* list available devices and exit */
 136 /*
 137  * This is exported because, in some versions of libpcap, if libpcap
 138  * is built with optimizer debugging code (which is *NOT* the default
 139  * configuration!), the library *imports*(!) a variable named dflag,
 140  * under the expectation that tcpdump is exporting it, to govern
 141  * how much debugging information to print when optimizing
 142  * the generated BPF code.
 143  *
 144  * This is a horrible hack; newer versions of libpcap don't import
 145  * dflag but, instead, *if* built with optimizer debugging code,
 146  * *export* a routine to set that flag.
 147  */
 148 int dflag;                              /* print filter code */
 149 static int Gflag;                       /* rotate dump files after this many seconds */
 150 static int Gflag_count;                 /* number of files created with Gflag rotation */
 151 static time_t Gflag_time;               /* The last time_t the dump file was rotated. */
 152 static int Lflag;                       /* list available data link types and exit */
 153 static int Iflag;                       /* rfmon (monitor) mode */
 154 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 155 static int Jflag;                       /* list available time stamp types */
 156 #endif
 157 static int jflag = -1;                  /* packet time stamp source */
 158 static int pflag;                       /* don't go promiscuous */
 159 #ifdef HAVE_PCAP_SETDIRECTION
 160 static int Qflag = -1;                  /* restrict captured packet by send/receive direction */
 161 #endif
 162 static int Uflag;                       /* "unbuffered" output of dump files */
 163 static int Wflag;                       /* recycle output files after this number of files */
 164 static int WflagChars;
 165 static char *zflag = NULL;              /* compress each savefile using a specified command (like gzip or bzip2) */
 166 static int immediate_mode;
 167
 168 static int infodelay;
 169 static int infoprint;
 170
 171 char *program_name;
 172
 173 /* Forwards */
 174 static void error(FORMAT_STRING(const char *), ...) NORETURN PRINTFLIKE(1, 2);
 175 static void warning(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2);
 176 static void exit_tcpdump(int) NORETURN;
 177 static RETSIGTYPE cleanup(int);
 178 static RETSIGTYPE child_cleanup(int);
 179 static void print_version(void);
 180 static void print_usage(void);
 181 static void show_tstamp_types_and_exit(pcap_t *, const char *device) NORETURN;
 182 static void show_dlts_and_exit(pcap_t *, const char *device) NORETURN;
 183 #ifdef HAVE_PCAP_FINDALLDEVS
 184 static void show_devices_and_exit (void) NORETURN;
 185 #endif
 186
 187 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 188 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 189 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 190 static void droproot(const char *, const char *);
 191
 192 #ifdef SIGNAL_REQ_INFO
 193 RETSIGTYPE requestinfo(int);
 194 #endif
 195
 196 #if defined(USE_WIN32_MM_TIMER)
 197   #include <MMsystem.h>
 198   static UINT timer_id;
 199   static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
 200 #elif defined(HAVE_ALARM)
 201   static void verbose_stats_dump(int sig);
 202 #endif
 203
 204 static void info(int);
 205 static u_int packets_captured;
 206
 207 #ifdef HAVE_PCAP_FINDALLDEVS
 208 static const struct tok status_flags[] = {
 209 #ifdef PCAP_IF_UP
 210         { PCAP_IF_UP,       "Up"       },
 211 #endif
 212 #ifdef PCAP_IF_RUNNING
 213         { PCAP_IF_RUNNING,  "Running"  },
 214 #endif
 215         { PCAP_IF_LOOPBACK, "Loopback" },
 216         { 0, NULL }
 217 };
 218 #endif
 219
 220 static pcap_t *pd;
 221
 222 static int supports_monitor_mode;
 223
 224 extern int optind;
 225 extern int opterr;
 226 extern char *optarg;
 227
 228 struct dump_info {
 229         char    *WFileName;
 230         char    *CurrentFileName;
 231         pcap_t  *pd;
 232         pcap_dumper_t *p;
 233 #ifdef HAVE_CAPSICUM
 234         int     dirfd;
 235 #endif
 236 };
 237
 238 #if defined(HAVE_PCAP_SET_PARSER_DEBUG)
 239 /*
 240  * We have pcap_set_parser_debug() in libpcap; declare it (it's not declared
 241  * by any libpcap header, because it's a special hack, only available if
 242  * libpcap was configured to include it, and only intended for use by
 243  * libpcap developers trying to debug the parser for filter expressions).
 244  */
 245 #ifdef _WIN32
 246 __declspec(dllimport)
 247 #else /* _WIN32 */
 248 extern
 249 #endif /* _WIN32 */
 250 void pcap_set_parser_debug(int);
 251 #elif defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 252 /*
 253  * We don't have pcap_set_parser_debug() in libpcap, but we do have
 254  * pcap_debug or yydebug.  Make a local version of pcap_set_parser_debug()
 255  * to set the flag, and define HAVE_PCAP_SET_PARSER_DEBUG.
 256  */
 257 static void
 258 pcap_set_parser_debug(int value)
 259 {
 260 #ifdef HAVE_PCAP_DEBUG
 261         extern int pcap_debug;
 262
 263         pcap_debug = value;
 264 #else /* HAVE_PCAP_DEBUG */
 265         extern int yydebug;
 266
 267         yydebug = value;
 268 #endif /* HAVE_PCAP_DEBUG */
 269 }
 270
 271 #define HAVE_PCAP_SET_PARSER_DEBUG
 272 #endif
 273
 274 #if defined(HAVE_PCAP_SET_OPTIMIZER_DEBUG)
 275 /*
 276  * We have pcap_set_optimizer_debug() in libpcap; declare it (it's not declared
 277  * by any libpcap header, because it's a special hack, only available if
 278  * libpcap was configured to include it, and only intended for use by
 279  * libpcap developers trying to debug the optimizer for filter expressions).
 280  */
 281 #ifdef _WIN32
 282 __declspec(dllimport)
 283 #else /* _WIN32 */
 284 extern
 285 #endif /* _WIN32 */
 286 void pcap_set_optimizer_debug(int);
 287 #endif
 288
 289 /* VARARGS */
 290 static void
 291 error(const char *fmt, ...)
 292 {
 293         va_list ap;
 294
 295         (void)fprintf(stderr, "%s: ", program_name);
 296         va_start(ap, fmt);
 297         (void)vfprintf(stderr, fmt, ap);
 298         va_end(ap);
 299         if (*fmt) {
 300                 fmt += strlen(fmt);
 301                 if (fmt[-1] != '\n')
 302                         (void)fputc('\n', stderr);
 303         }
 304         exit_tcpdump(1);
 305         /* NOTREACHED */
 306 }
 307
 308 /* VARARGS */
 309 static void
 310 warning(const char *fmt, ...)
 311 {
 312         va_list ap;
 313
 314         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 315         va_start(ap, fmt);
 316         (void)vfprintf(stderr, fmt, ap);
 317         va_end(ap);
 318         if (*fmt) {
 319                 fmt += strlen(fmt);
 320                 if (fmt[-1] != '\n')
 321                         (void)fputc('\n', stderr);
 322         }
 323 }
 324
 325 static void
 326 exit_tcpdump(int status)
 327 {
 328         nd_cleanup();
 329         exit(status);
 330 }
 331
 332 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 333 static void
 334 show_tstamp_types_and_exit(pcap_t *pc, const char *device)
 335 {
 336         int n_tstamp_types;
 337         int *tstamp_types = 0;
 338         const char *tstamp_type_name;
 339         int i;
 340
 341         n_tstamp_types = pcap_list_tstamp_types(pc, &tstamp_types);
 342         if (n_tstamp_types < 0)
 343                 error("%s", pcap_geterr(pc));
 344
 345         if (n_tstamp_types == 0) {
 346                 fprintf(stderr, "Time stamp type cannot be set for %s\n",
 347                     device);
 348                 exit_tcpdump(0);
 349         }
 350         fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
 351             device);
 352         for (i = 0; i < n_tstamp_types; i++) {
 353                 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
 354                 if (tstamp_type_name != NULL) {
 355                         (void) fprintf(stderr, "  %s (%s)\n", tstamp_type_name,
 356                             pcap_tstamp_type_val_to_description(tstamp_types[i]));
 357                 } else {
 358                         (void) fprintf(stderr, "  %d\n", tstamp_types[i]);
 359                 }
 360         }
 361         pcap_free_tstamp_types(tstamp_types);
 362         exit_tcpdump(0);
 363 }
 364 #endif
 365
 366 static void
 367 show_dlts_and_exit(pcap_t *pc, const char *device)
 368 {
 369         int n_dlts, i;
 370         int *dlts = 0;
 371         const char *dlt_name;
 372
 373         n_dlts = pcap_list_datalinks(pc, &dlts);
 374         if (n_dlts < 0)
 375                 error("%s", pcap_geterr(pc));
 376         else if (n_dlts == 0 || !dlts)
 377                 error("No data link types.");
 378
 379         /*
 380          * If the interface is known to support monitor mode, indicate
 381          * whether these are the data link types available when not in
 382          * monitor mode, if -I wasn't specified, or when in monitor mode,
 383          * when -I was specified (the link-layer types available in
 384          * monitor mode might be different from the ones available when
 385          * not in monitor mode).
 386          */
 387         if (supports_monitor_mode)
 388                 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
 389                     device,
 390                     Iflag ? "when in monitor mode" : "when not in monitor mode");
 391         else
 392                 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
 393                     device);
 394
 395         for (i = 0; i < n_dlts; i++) {
 396                 dlt_name = pcap_datalink_val_to_name(dlts[i]);
 397                 if (dlt_name != NULL) {
 398                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
 399                             pcap_datalink_val_to_description(dlts[i]));
 400
 401                         /*
 402                          * OK, does tcpdump handle that type?
 403                          */
 404                         if (!has_printer(dlts[i]))
 405                                 (void) fprintf(stderr, " (printing not supported)");
 406                         fprintf(stderr, "\n");
 407                 } else {
 408                         (void) fprintf(stderr, "  DLT %d (printing not supported)\n",
 409                             dlts[i]);
 410                 }
 411         }
 412 #ifdef HAVE_PCAP_FREE_DATALINKS
 413         pcap_free_datalinks(dlts);
 414 #endif
 415         exit_tcpdump(0);
 416 }
 417
 418 #ifdef HAVE_PCAP_FINDALLDEVS
 419 static void
 420 show_devices_and_exit (void)
 421 {
 422         pcap_if_t *dev, *devlist;
 423         char ebuf[PCAP_ERRBUF_SIZE];
 424         int i;
 425
 426         if (pcap_findalldevs(&devlist, ebuf) < 0)
 427                 error("%s", ebuf);
 428         for (i = 0, dev = devlist; dev != NULL; i++, dev = dev->next) {
 429                 printf("%d.%s", i+1, dev->name);
 430                 if (dev->description != NULL)
 431                         printf(" (%s)", dev->description);
 432                 if (dev->flags != 0)
 433                         printf(" [%s]", bittok2str(status_flags, "none", dev->flags));
 434                 printf("\n");
 435         }
 436         pcap_freealldevs(devlist);
 437         exit_tcpdump(0);
 438 }
 439 #endif /* HAVE_PCAP_FINDALLDEVS */
 440
 441 /*
 442  * Short options.
 443  *
 444  * Note that there we use all letters for short options except for g, k,
 445  * o, and P, and those are used by other versions of tcpdump, and we should
 446  * only use them for the same purposes that the other versions of tcpdump
 447  * use them:
 448  *
 449  * OS X tcpdump uses -g to force non--v output for IP to be on one
 450  * line, making it more "g"repable;
 451  *
 452  * OS X tcpdump uses -k to specify that packet comments in pcap-ng files
 453  * should be printed;
 454  *
 455  * OpenBSD tcpdump uses -o to indicate that OS fingerprinting should be done
 456  * for hosts sending TCP SYN packets;
 457  *
 458  * OS X tcpdump uses -P to indicate that -w should write pcap-ng rather
 459  * than pcap files.
 460  *
 461  * OS X tcpdump also uses -Q to specify expressions that match packet
 462  * metadata, including but not limited to the packet direction.
 463  * The expression syntax is different from a simple "in|out|inout",
 464  * and those expressions aren't accepted by OS X tcpdump, but the
 465  * equivalents would be "in" = "dir=in", "out" = "dir=out", and
 466  * "inout" = "dir=in or dir=out", and the parser could conceivably
 467  * special-case "in", "out", and "inout" as expressions for backwards
 468  * compatibility, so all is not (yet) lost.
 469  */
 470
 471 /*
 472  * Set up flags that might or might not be supported depending on the
 473  * version of libpcap we're using.
 474  */
 475 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
 476 #define B_FLAG          "B:"
 477 #define B_FLAG_USAGE    " [ -B size ]"
 478 #else /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
 479 #define B_FLAG
 480 #define B_FLAG_USAGE
 481 #endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
 482
 483 #ifdef HAVE_PCAP_CREATE
 484 #define I_FLAG          "I"
 485 #else /* HAVE_PCAP_CREATE */
 486 #define I_FLAG
 487 #endif /* HAVE_PCAP_CREATE */
 488
 489 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 490 #define j_FLAG          "j:"
 491 #define j_FLAG_USAGE    " [ -j tstamptype ]"
 492 #define J_FLAG          "J"
 493 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
 494 #define j_FLAG
 495 #define j_FLAG_USAGE
 496 #define J_FLAG
 497 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
 498
 499 #ifdef HAVE_PCAP_FINDALLDEVS
 500 #define D_FLAG  "D"
 501 #else
 502 #define D_FLAG
 503 #endif
 504
 505 #ifdef HAVE_PCAP_DUMP_FLUSH
 506 #define U_FLAG  "U"
 507 #else
 508 #define U_FLAG
 509 #endif
 510
 511 #ifdef HAVE_PCAP_SETDIRECTION
 512 #define Q_FLAG "Q:"
 513 #else
 514 #define Q_FLAG
 515 #endif
 516
 517 #define SHORTOPTS "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpq" Q_FLAG "r:s:StT:u" U_FLAG "vV:w:W:xXy:Yz:Z:#"
 518
 519 /*
 520  * Long options.
 521  *
 522  * We do not currently have long options corresponding to all short
 523  * options; we should probably pick appropriate option names for them.
 524  *
 525  * However, the short options where the number of times the option is
 526  * specified matters, such as -v and -d and -t, should probably not
 527  * just map to a long option, as saying
 528  *
 529  *  tcpdump --verbose --verbose
 530  *
 531  * doesn't make sense; it should be --verbosity={N} or something such
 532  * as that.
 533  *
 534  * For long options with no corresponding short options, we define values
 535  * outside the range of ASCII graphic characters, make that the last
 536  * component of the entry for the long option, and have a case for that
 537  * option in the switch statement.
 538  */
 539 #define OPTION_VERSION          128
 540 #define OPTION_TSTAMP_PRECISION 129
 541 #define OPTION_IMMEDIATE_MODE   130
 542
 543 static const struct option longopts[] = {
 544 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
 545         { "buffer-size", required_argument, NULL, 'B' },
 546 #endif
 547         { "list-interfaces", no_argument, NULL, 'D' },
 548         { "help", no_argument, NULL, 'h' },
 549         { "interface", required_argument, NULL, 'i' },
 550 #ifdef HAVE_PCAP_CREATE
 551         { "monitor-mode", no_argument, NULL, 'I' },
 552 #endif
 553 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 554         { "time-stamp-type", required_argument, NULL, 'j' },
 555         { "list-time-stamp-types", no_argument, NULL, 'J' },
 556 #endif
 557 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
 558         { "time-stamp-precision", required_argument, NULL, OPTION_TSTAMP_PRECISION},
 559 #endif
 560         { "dont-verify-checksums", no_argument, NULL, 'K' },
 561         { "list-data-link-types", no_argument, NULL, 'L' },
 562         { "no-optimize", no_argument, NULL, 'O' },
 563         { "no-promiscuous-mode", no_argument, NULL, 'p' },
 564 #ifdef HAVE_PCAP_SETDIRECTION
 565         { "direction", required_argument, NULL, 'Q' },
 566 #endif
 567         { "snapshot-length", required_argument, NULL, 's' },
 568         { "absolute-tcp-sequence-numbers", no_argument, NULL, 'S' },
 569 #ifdef HAVE_PCAP_DUMP_FLUSH
 570         { "packet-buffered", no_argument, NULL, 'U' },
 571 #endif
 572         { "linktype", required_argument, NULL, 'y' },
 573 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
 574         { "immediate-mode", no_argument, NULL, OPTION_IMMEDIATE_MODE },
 575 #endif
 576 #ifdef HAVE_PCAP_SET_PARSER_DEBUG
 577         { "debug-filter-parser", no_argument, NULL, 'Y' },
 578 #endif
 579         { "relinquish-privileges", required_argument, NULL, 'Z' },
 580         { "number", no_argument, NULL, '#' },
 581         { "version", no_argument, NULL, OPTION_VERSION },
 582         { NULL, 0, NULL, 0 }
 583 };
 584
 585 #ifndef _WIN32
 586 /* Drop root privileges and chroot if necessary */
 587 static void
 588 droproot(const char *username, const char *chroot_dir)
 589 {
 590         struct passwd *pw = NULL;
 591
 592         if (chroot_dir && !username) {
 593                 fprintf(stderr, "%s: Chroot without dropping root is insecure\n",
 594                         program_name);
 595                 exit_tcpdump(1);
 596         }
 597
 598         pw = getpwnam(username);
 599         if (pw) {
 600                 if (chroot_dir) {
 601                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
 602                                 fprintf(stderr, "%s: Couldn't chroot/chdir to '%.64s': %s\n",
 603                                         program_name, chroot_dir, pcap_strerror(errno));
 604                                 exit_tcpdump(1);
 605                         }
 606                 }
 607 #ifdef HAVE_LIBCAP_NG
 608                 {
 609                         int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
 610                         if (ret < 0)
 611                                 error("capng_change_id(): return %d\n", ret);
 612                         else
 613                                 fprintf(stderr, "dropped privs to %s\n", username);
 614                 }
 615 #else
 616                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
 617                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
 618                         fprintf(stderr, "%s: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
 619                                 program_name, username,
 620                                 (unsigned long)pw->pw_uid,
 621                                 (unsigned long)pw->pw_gid,
 622                                 pcap_strerror(errno));
 623                         exit_tcpdump(1);
 624                 }
 625                 else {
 626                         fprintf(stderr, "dropped privs to %s\n", username);
 627                 }
 628 #endif /* HAVE_LIBCAP_NG */
 629         }
 630         else {
 631                 fprintf(stderr, "%s: Couldn't find user '%.32s'\n",
 632                         program_name, username);
 633                 exit_tcpdump(1);
 634         }
 635 #ifdef HAVE_LIBCAP_NG
 636         /* We don't need CAP_SETUID, CAP_SETGID and CAP_SYS_CHROOT any more. */
 637         capng_updatev(
 638                 CAPNG_DROP,
 639                 CAPNG_EFFECTIVE | CAPNG_PERMITTED,
 640                 CAP_SETUID,
 641                 CAP_SETGID,
 642                 CAP_SYS_CHROOT,
 643                 -1);
 644         capng_apply(CAPNG_SELECT_BOTH);
 645 #endif /* HAVE_LIBCAP_NG */
 646
 647 }
 648 #endif /* _WIN32 */
 649
 650 static int
 651 getWflagChars(int x)
 652 {
 653         int c = 0;
 654
 655         x -= 1;
 656         while (x > 0) {
 657                 c += 1;
 658                 x /= 10;
 659         }
 660
 661         return c;
 662 }
 663
 664
 665 static void
 666 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
 667 {
 668         char *filename = malloc(PATH_MAX + 1);
 669         if (filename == NULL)
 670             error("Makefilename: malloc");
 671
 672         /* Process with strftime if Gflag is set. */
 673         if (Gflag != 0) {
 674           struct tm *local_tm;
 675
 676           /* Convert Gflag_time to a usable format */
 677           if ((local_tm = localtime(&Gflag_time)) == NULL) {
 678                   error("MakeTimedFilename: localtime");
 679           }
 680
 681           /* There's no good way to detect an error in strftime since a return
 682            * value of 0 isn't necessarily failure.
 683            */
 684           strftime(filename, PATH_MAX, orig_name, local_tm);
 685         } else {
 686           strncpy(filename, orig_name, PATH_MAX);
 687         }
 688
 689         if (cnt == 0 && max_chars == 0)
 690                 strncpy(buffer, filename, PATH_MAX + 1);
 691         else
 692                 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
 693                   /* Report an error if the filename is too large */
 694                   error("too many output files or filename is too long (> %d)", PATH_MAX);
 695         free(filename);
 696 }
 697
 698 static char *
 699 get_next_file(FILE *VFile, char *ptr)
 700 {
 701         char *ret;
 702         size_t len;
 703
 704         ret = fgets(ptr, PATH_MAX, VFile);
 705         if (!ret)
 706                 return NULL;
 707
 708         len = strlen (ptr);
 709         if (len > 0 && ptr[len - 1] == '\n')
 710                 ptr[len - 1] = '\0';
 711
 712         return ret;
 713 }
 714
 715 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
 716 static int
 717 tstamp_precision_from_string(const char *precision)
 718 {
 719         if (strncmp(precision, "nano", strlen("nano")) == 0)
 720                 return PCAP_TSTAMP_PRECISION_NANO;
 721
 722         if (strncmp(precision, "micro", strlen("micro")) == 0)
 723                 return PCAP_TSTAMP_PRECISION_MICRO;
 724
 725         return -EINVAL;
 726 }
 727
 728 static const char *
 729 tstamp_precision_to_string(int precision)
 730 {
 731         switch (precision) {
 732
 733         case PCAP_TSTAMP_PRECISION_MICRO:
 734                 return "micro";
 735
 736         case PCAP_TSTAMP_PRECISION_NANO:
 737                 return "nano";
 738
 739         default:
 740                 return "unknown";
 741         }
 742 }
 743 #endif
 744
 745 #ifdef HAVE_CAPSICUM
 746 /*
 747  * Ensure that, on a dump file's descriptor, we have all the rights
 748  * necessary to make the standard I/O library work with an fdopen()ed
 749  * FILE * from that descriptor.
 750  *
 751  * A long time ago, in a galaxy far far away, AT&T decided that, instead
 752  * of providing separate APIs for getting and setting the FD_ flags on a
 753  * descriptor, getting and setting the O_ flags on a descriptor, and
 754  * locking files, they'd throw them all into a kitchen-sink fcntl() call
 755  * along the lines of ioctl(), the fact that ioctl() operations are
 756  * largely specific to particular character devices but fcntl() operations
 757  * are either generic to all descriptors or generic to all descriptors for
 758  * regular files nonwithstanding.
 759  *
 760  * The Capsicum people decided that fine-grained control of descriptor
 761  * operations was required, so that you need to grant permission for
 762  * reading, writing, seeking, and fcntl-ing.  The latter, courtesy of
 763  * AT&T's decision, means that "fcntl-ing" isn't a thing, but a motley
 764  * collection of things, so there are *individual* fcntls for which
 765  * permission needs to be granted.
 766  *
 767  * The FreeBSD standard I/O people implemented some optimizations that
 768  * requires that the standard I/O routines be able to determine whether
 769  * the descriptor for the FILE * is open append-only or not; as that
 770  * descriptor could have come from an open() rather than an fopen(),
 771  * that requires that it be able to do an F_GETFL fcntl() to read
 772  * the O_ flags.
 773  *
 774  * Tcpdump uses ftell() to determine how much data has been written
 775  * to a file in order to, when used with -C, determine when it's time
 776  * to rotate capture files.  ftell() therefore needs to do an lseek()
 777  * to find out the file offset and must, thanks to the aforementioned
 778  * optimization, also know whether the descriptor is open append-only
 779  * or not.
 780  *
 781  * The net result of all the above is that we need to grant CAP_SEEK,
 782  * CAP_WRITE, and CAP_FCNTL with the CAP_FCNTL_GETFL subcapability.
 783  *
 784  * Perhaps this is the universe's way of saying that either
 785  *
 786  *      1) there needs to be an fopenat() call and a pcap_dump_openat() call
 787  *         using it, so that Capsicum-capable tcpdump wouldn't need to do
 788  *         an fdopen()
 789  *
 790  * or
 791  *
 792  *      2) there needs to be a cap_fdopen() call in the FreeBSD standard
 793  *         I/O library that knows what rights are needed by the standard
 794  *         I/O library, based on the open mode, and assigns them, perhaps
 795  *         with an additional argument indicating, for example, whether
 796  *         seeking should be allowed, so that tcpdump doesn't need to know
 797  *         what the standard I/O library happens to require this week.
 798  */
 799 static void
 800 set_dumper_capsicum_rights(pcap_dumper_t *p)
 801 {
 802         int fd = fileno(pcap_dump_file(p));
 803         cap_rights_t rights;
 804
 805         cap_rights_init(&rights, CAP_SEEK, CAP_WRITE, CAP_FCNTL);
 806         if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
 807                 error("unable to limit dump descriptor");
 808         }
 809         if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) {
 810                 error("unable to limit dump descriptor fcntls");
 811         }
 812 }
 813 #endif
 814
 815 /*
 816  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 817  */
 818 static char *
 819 copy_argv(register char **argv)
 820 {
 821         register char **p;
 822         register u_int len = 0;
 823         char *buf;
 824         char *src, *dst;
 825
 826         p = argv;
 827         if (*p == NULL)
 828                 return 0;
 829
 830         while (*p)
 831                 len += strlen(*p++) + 1;
 832
 833         buf = (char *)malloc(len);
 834         if (buf == NULL)
 835                 error("copy_argv: malloc");
 836
 837         p = argv;
 838         dst = buf;
 839         while ((src = *p++) != NULL) {
 840                 while ((*dst++ = *src++) != '\0')
 841                         ;
 842                 dst[-1] = ' ';
 843         }
 844         dst[-1] = '\0';
 845
 846         return buf;
 847 }
 848
 849 /*
 850  * On Windows, we need to open the file in binary mode, so that
 851  * we get all the bytes specified by the size we get from "fstat()".
 852  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
 853  * we define it as 0 if it's not defined, so it does nothing.
 854  */
 855 #ifndef O_BINARY
 856 #define O_BINARY        0
 857 #endif
 858
 859 static char *
 860 read_infile(char *fname)
 861 {
 862         register int i, fd, cc;
 863         register char *cp;
 864         struct stat buf;
 865
 866         fd = open(fname, O_RDONLY|O_BINARY);
 867         if (fd < 0)
 868                 error("can't open %s: %s", fname, pcap_strerror(errno));
 869
 870         if (fstat(fd, &buf) < 0)
 871                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 872
 873         cp = malloc((u_int)buf.st_size + 1);
 874         if (cp == NULL)
 875                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
 876                         fname, pcap_strerror(errno));
 877         cc = read(fd, cp, (u_int)buf.st_size);
 878         if (cc < 0)
 879                 error("read %s: %s", fname, pcap_strerror(errno));
 880         if (cc != buf.st_size)
 881                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 882
 883         close(fd);
 884         /* replace "# comment" with spaces */
 885         for (i = 0; i < cc; i++) {
 886                 if (cp[i] == '#')
 887                         while (i < cc && cp[i] != '\n')
 888                                 cp[i++] = ' ';
 889         }
 890         cp[cc] = '\0';
 891         return (cp);
 892 }
 893
 894 #ifdef HAVE_PCAP_FINDALLDEVS
 895 static long
 896 parse_interface_number(const char *device)
 897 {
 898         long devnum;
 899         char *end;
 900
 901         devnum = strtol(device, &end, 10);
 902         if (device != end && *end == '\0') {
 903                 /*
 904                  * It's all-numeric, but is it a valid number?
 905                  */
 906                 if (devnum <= 0) {
 907                         /*
 908                          * No, it's not an ordinal.
 909                          */
 910                         error("Invalid adapter index");
 911                 }
 912                 return (devnum);
 913         } else {
 914                 /*
 915                  * It's not all-numeric; return -1, so our caller
 916                  * knows that.
 917                  */
 918                 return (-1);
 919         }
 920 }
 921
 922 static char *
 923 find_interface_by_number(long devnum)
 924 {
 925         pcap_if_t *dev, *devlist;
 926         long i;
 927         char ebuf[PCAP_ERRBUF_SIZE];
 928         char *device;
 929
 930         if (pcap_findalldevs(&devlist, ebuf) < 0)
 931                 error("%s", ebuf);
 932         /*
 933          * Look for the devnum-th entry in the list of devices (1-based).
 934          */
 935         for (i = 0, dev = devlist; i < devnum-1 && dev != NULL;
 936             i++, dev = dev->next)
 937                 ;
 938         if (dev == NULL)
 939                 error("Invalid adapter index");
 940         device = strdup(dev->name);
 941         pcap_freealldevs(devlist);
 942         return (device);
 943 }
 944 #endif
 945
 946 static pcap_t *
 947 open_interface(const char *device, netdissect_options *ndo, char *ebuf)
 948 {
 949         pcap_t *pc;
 950 #ifdef HAVE_PCAP_CREATE
 951         int status;
 952         char *cp;
 953 #endif
 954
 955 #ifdef HAVE_PCAP_CREATE
 956         pc = pcap_create(device, ebuf);
 957         if (pc == NULL) {
 958                 /*
 959                  * If this failed with "No such device", that means
 960                  * the interface doesn't exist; return NULL, so that
 961                  * the caller can see whether the device name is
 962                  * actually an interface index.
 963                  */
 964                 if (strstr(ebuf, "No such device") != NULL)
 965                         return (NULL);
 966                 error("%s", ebuf);
 967         }
 968 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 969         if (Jflag)
 970                 show_tstamp_types_and_exit(pc, device);
 971 #endif
 972 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
 973         status = pcap_set_tstamp_precision(pc, ndo->ndo_tstamp_precision);
 974         if (status != 0)
 975                 error("%s: Can't set %ssecond time stamp precision: %s",
 976                         device,
 977                         tstamp_precision_to_string(ndo->ndo_tstamp_precision),
 978                         pcap_statustostr(status));
 979 #endif
 980
 981 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
 982         if (immediate_mode) {
 983                 status = pcap_set_immediate_mode(pc, 1);
 984                 if (status != 0)
 985                         error("%s: Can't set immediate mode: %s",
 986                         device,
 987                         pcap_statustostr(status));
 988         }
 989 #endif
 990         /*
 991          * Is this an interface that supports monitor mode?
 992          */
 993         if (pcap_can_set_rfmon(pc) == 1)
 994                 supports_monitor_mode = 1;
 995         else
 996                 supports_monitor_mode = 0;
 997         status = pcap_set_snaplen(pc, ndo->ndo_snaplen);
 998         if (status != 0)
 999                 error("%s: Can't set snapshot length: %s",
1000                     device, pcap_statustostr(status));
1001         status = pcap_set_promisc(pc, !pflag);
1002         if (status != 0)
1003                 error("%s: Can't set promiscuous mode: %s",
1004                     device, pcap_statustostr(status));
1005         if (Iflag) {
1006                 status = pcap_set_rfmon(pc, 1);
1007                 if (status != 0)
1008                         error("%s: Can't set monitor mode: %s",
1009                             device, pcap_statustostr(status));
1010         }
1011         status = pcap_set_timeout(pc, 1000);
1012         if (status != 0)
1013                 error("%s: pcap_set_timeout failed: %s",
1014                     device, pcap_statustostr(status));
1015         if (Bflag != 0) {
1016                 status = pcap_set_buffer_size(pc, Bflag);
1017                 if (status != 0)
1018                         error("%s: Can't set buffer size: %s",
1019                             device, pcap_statustostr(status));
1020         }
1021 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1022         if (jflag != -1) {
1023                 status = pcap_set_tstamp_type(pc, jflag);
1024                 if (status < 0)
1025                         error("%s: Can't set time stamp type: %s",
1026                               device, pcap_statustostr(status));
1027                 else if (status > 0)
1028                         warning("When trying to set timestamp type '%s' on %s: %s",
1029                                 pcap_tstamp_type_val_to_name(jflag), device,
1030                                 pcap_statustostr(status));
1031         }
1032 #endif
1033         status = pcap_activate(pc);
1034         if (status < 0) {
1035                 /*
1036                  * pcap_activate() failed.
1037                  */
1038                 cp = pcap_geterr(pc);
1039                 if (status == PCAP_ERROR)
1040                         error("%s", cp);
1041                 else if (status == PCAP_ERROR_NO_SUCH_DEVICE) {
1042                         /*
1043                          * Return an error for our caller to handle.
1044                          */
1045                         snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s\n(%s)",
1046                             device, pcap_statustostr(status), cp);
1047                         pcap_close(pc);
1048                         return (NULL);
1049                 } else if (status == PCAP_ERROR_PERM_DENIED && *cp != '\0')
1050                         error("%s: %s\n(%s)", device,
1051                             pcap_statustostr(status), cp);
1052                 else
1053                         error("%s: %s", device,
1054                             pcap_statustostr(status));
1055         } else if (status > 0) {
1056                 /*
1057                  * pcap_activate() succeeded, but it's warning us
1058                  * of a problem it had.
1059                  */
1060                 cp = pcap_geterr(pc);
1061                 if (status == PCAP_WARNING)
1062                         warning("%s", cp);
1063                 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1064                          *cp != '\0')
1065                         warning("%s: %s\n(%s)", device,
1066                             pcap_statustostr(status), cp);
1067                 else
1068                         warning("%s: %s", device,
1069                             pcap_statustostr(status));
1070         }
1071 #ifdef HAVE_PCAP_SETDIRECTION
1072         if (Qflag != -1) {
1073                 status = pcap_setdirection(pc, Qflag);
1074                 if (status != 0)
1075                         error("%s: pcap_setdirection() failed: %s",
1076                               device,  pcap_geterr(pc));
1077                 }
1078 #endif /* HAVE_PCAP_SETDIRECTION */
1079 #else /* HAVE_PCAP_CREATE */
1080         *ebuf = '\0';
1081         pc = pcap_open_live(device, ndo->ndo_snaplen, !pflag, 1000, ebuf);
1082         if (pc == NULL) {
1083                 /*
1084                  * If this failed with "No such device", that means
1085                  * the interface doesn't exist; return NULL, so that
1086                  * the caller can see whether the device name is
1087                  * actually an interface index.
1088                  */
1089                 if (strstr(ebuf, "No such device") != NULL)
1090                         return (NULL);
1091                 error("%s", ebuf);
1092         }
1093         if (*ebuf)
1094                 warning("%s", ebuf);
1095 #endif /* HAVE_PCAP_CREATE */
1096
1097         return (pc);
1098 }
1099
1100 int
1101 main(int argc, char **argv)
1102 {
1103         register int cnt, op, i;
1104         bpf_u_int32 localnet =0 , netmask = 0;
1105         int timezone_offset = 0;
1106         register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
1107         pcap_handler callback;
1108         int dlt;
1109         const char *dlt_name;
1110         struct bpf_program fcode;
1111 #ifndef _WIN32
1112         RETSIGTYPE (*oldhandler)(int);
1113 #endif
1114         struct dump_info dumpinfo;
1115         u_char *pcap_userdata;
1116         char ebuf[PCAP_ERRBUF_SIZE];
1117         char VFileLine[PATH_MAX + 1];
1118         char *username = NULL;
1119         char *chroot_dir = NULL;
1120         char *ret = NULL;
1121         char *end;
1122 #ifdef HAVE_PCAP_FINDALLDEVS
1123         pcap_if_t *devlist;
1124         long devnum;
1125 #endif
1126         int status;
1127         FILE *VFile;
1128 #ifdef HAVE_CAPSICUM
1129         cap_rights_t rights;
1130         int cansandbox;
1131 #endif  /* HAVE_CAPSICUM */
1132         int Oflag = 1;                  /* run filter code optimizer */
1133         int yflag_dlt = -1;
1134         const char *yflag_dlt_name = NULL;
1135
1136         netdissect_options Ndo;
1137         netdissect_options *ndo = &Ndo;
1138
1139         /*
1140          * Initialize the netdissect code.
1141          */
1142         if (nd_init(ebuf, sizeof ebuf) == -1)
1143                 error("%s", ebuf);
1144
1145         memset(ndo, 0, sizeof(*ndo));
1146         ndo_set_function_pointers(ndo);
1147         ndo->ndo_snaplen = DEFAULT_SNAPLEN;
1148
1149         cnt = -1;
1150         device = NULL;
1151         infile = NULL;
1152         RFileName = NULL;
1153         VFileName = NULL;
1154         VFile = NULL;
1155         WFileName = NULL;
1156         dlt = -1;
1157         if ((cp = strrchr(argv[0], '/')) != NULL)
1158                 ndo->program_name = program_name = cp + 1;
1159         else
1160                 ndo->program_name = program_name = argv[0];
1161
1162 #ifdef _WIN32
1163         if (pcap_wsockinit() != 0)
1164                 error("Attempting to initialize Winsock failed");
1165 #endif /* _WIN32 */
1166
1167         /*
1168          * On platforms where the CPU doesn't support unaligned loads,
1169          * force unaligned accesses to abort with SIGBUS, rather than
1170          * being fixed up (slowly) by the OS kernel; on those platforms,
1171          * misaligned accesses are bugs, and we want tcpdump to crash so
1172          * that the bugs are reported.
1173          */
1174         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
1175                 error("%s", ebuf);
1176
1177         while (
1178             (op = getopt_long(argc, argv, SHORTOPTS, longopts, NULL)) != -1)
1179                 switch (op) {
1180
1181                 case 'a':
1182                         /* compatibility for old -a */
1183                         break;
1184
1185                 case 'A':
1186                         ++ndo->ndo_Aflag;
1187                         break;
1188
1189                 case 'b':
1190                         ++ndo->ndo_bflag;
1191                         break;
1192
1193 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
1194                 case 'B':
1195                         Bflag = atoi(optarg)*1024;
1196                         if (Bflag <= 0)
1197                                 error("invalid packet buffer size %s", optarg);
1198                         break;
1199 #endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
1200
1201                 case 'c':
1202                         cnt = atoi(optarg);
1203                         if (cnt <= 0)
1204                                 error("invalid packet count %s", optarg);
1205                         break;
1206
1207                 case 'C':
1208                         Cflag = atoi(optarg) * 1000000;
1209                         if (Cflag <= 0)
1210                                 error("invalid file size %s", optarg);
1211                         break;
1212
1213                 case 'd':
1214                         ++dflag;
1215                         break;
1216
1217                 case 'D':
1218                         Dflag++;
1219                         break;
1220
1221                 case 'L':
1222                         Lflag++;
1223                         break;
1224
1225                 case 'e':
1226                         ++ndo->ndo_eflag;
1227                         break;
1228
1229                 case 'E':
1230 #ifndef HAVE_LIBCRYPTO
1231                         warning("crypto code not compiled in");
1232 #endif
1233                         ndo->ndo_espsecret = optarg;
1234                         break;
1235
1236                 case 'f':
1237                         ++ndo->ndo_fflag;
1238                         break;
1239
1240                 case 'F':
1241                         infile = optarg;
1242                         break;
1243
1244                 case 'G':
1245                         Gflag = atoi(optarg);
1246                         if (Gflag < 0)
1247                                 error("invalid number of seconds %s", optarg);
1248
1249                         /* We will create one file initially. */
1250                         Gflag_count = 0;
1251
1252                         /* Grab the current time for rotation use. */
1253                         if ((Gflag_time = time(NULL)) == (time_t)-1) {
1254                                 error("main: can't get current time: %s",
1255                                     pcap_strerror(errno));
1256                         }
1257                         break;
1258
1259                 case 'h':
1260                         print_usage();
1261                         exit_tcpdump(0);
1262                         break;
1263
1264                 case 'H':
1265                         ++ndo->ndo_Hflag;
1266                         break;
1267
1268                 case 'i':
1269                         device = optarg;
1270                         break;
1271
1272 #ifdef HAVE_PCAP_CREATE
1273                 case 'I':
1274                         ++Iflag;
1275                         break;
1276 #endif /* HAVE_PCAP_CREATE */
1277
1278 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1279                 case 'j':
1280                         jflag = pcap_tstamp_type_name_to_val(optarg);
1281                         if (jflag < 0)
1282                                 error("invalid time stamp type %s", optarg);
1283                         break;
1284
1285                 case 'J':
1286                         Jflag++;
1287                         break;
1288 #endif
1289
1290                 case 'l':
1291 #ifdef _WIN32
1292                         /*
1293                          * _IOLBF is the same as _IOFBF in Microsoft's C
1294                          * libraries; the only alternative they offer
1295                          * is _IONBF.
1296                          *
1297                          * XXX - this should really be checking for MSVC++,
1298                          * not _WIN32, if, for example, MinGW has its own
1299                          * C library that is more UNIX-compatible.
1300                          */
1301                         setvbuf(stdout, NULL, _IONBF, 0);
1302 #else /* _WIN32 */
1303 #ifdef HAVE_SETLINEBUF
1304                         setlinebuf(stdout);
1305 #else
1306                         setvbuf(stdout, NULL, _IOLBF, 0);
1307 #endif
1308 #endif /* _WIN32 */
1309                         break;
1310
1311                 case 'K':
1312                         ++ndo->ndo_Kflag;
1313                         break;
1314
1315                 case 'm':
1316                         if (nd_have_smi_support()) {
1317                                 if (nd_load_smi_module(optarg, ebuf, sizeof ebuf) == -1)
1318                                         error("%s", ebuf);
1319                         } else {
1320                                 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
1321                                               program_name, optarg);
1322                                 (void)fprintf(stderr, "(no libsmi support)\n");
1323                         }
1324                         break;
1325
1326                 case 'M':
1327                         /* TCP-MD5 shared secret */
1328 #ifndef HAVE_LIBCRYPTO
1329                         warning("crypto code not compiled in");
1330 #endif
1331                         ndo->ndo_sigsecret = optarg;
1332                         break;
1333
1334                 case 'n':
1335                         ++ndo->ndo_nflag;
1336                         break;
1337
1338                 case 'N':
1339                         ++ndo->ndo_Nflag;
1340                         break;
1341
1342                 case 'O':
1343                         Oflag = 0;
1344                         break;
1345
1346                 case 'p':
1347                         ++pflag;
1348                         break;
1349
1350                 case 'q':
1351                         ++ndo->ndo_qflag;
1352                         ++ndo->ndo_suppress_default_print;
1353                         break;
1354
1355 #ifdef HAVE_PCAP_SETDIRECTION
1356                 case 'Q':
1357                         if (ascii_strcasecmp(optarg, "in") == 0)
1358                                 Qflag = PCAP_D_IN;
1359                         else if (ascii_strcasecmp(optarg, "out") == 0)
1360                                 Qflag = PCAP_D_OUT;
1361                         else if (ascii_strcasecmp(optarg, "inout") == 0)
1362                                 Qflag = PCAP_D_INOUT;
1363                         else
1364                                 error("unknown capture direction `%s'", optarg);
1365                         break;
1366 #endif /* HAVE_PCAP_SETDIRECTION */
1367
1368                 case 'r':
1369                         RFileName = optarg;
1370                         break;
1371
1372                 case 's':
1373                         ndo->ndo_snaplen = strtol(optarg, &end, 0);
1374                         if (optarg == end || *end != '\0'
1375                             || ndo->ndo_snaplen < 0 || ndo->ndo_snaplen > MAXIMUM_SNAPLEN)
1376                                 error("invalid snaplen %s", optarg);
1377                         else if (ndo->ndo_snaplen == 0)
1378                                 ndo->ndo_snaplen = MAXIMUM_SNAPLEN;
1379                         break;
1380
1381                 case 'S':
1382                         ++ndo->ndo_Sflag;
1383                         break;
1384
1385                 case 't':
1386                         ++ndo->ndo_tflag;
1387                         break;
1388
1389                 case 'T':
1390                         if (ascii_strcasecmp(optarg, "vat") == 0)
1391                                 ndo->ndo_packettype = PT_VAT;
1392                         else if (ascii_strcasecmp(optarg, "wb") == 0)
1393                                 ndo->ndo_packettype = PT_WB;
1394                         else if (ascii_strcasecmp(optarg, "rpc") == 0)
1395                                 ndo->ndo_packettype = PT_RPC;
1396                         else if (ascii_strcasecmp(optarg, "rtp") == 0)
1397                                 ndo->ndo_packettype = PT_RTP;
1398                         else if (ascii_strcasecmp(optarg, "rtcp") == 0)
1399                                 ndo->ndo_packettype = PT_RTCP;
1400                         else if (ascii_strcasecmp(optarg, "snmp") == 0)
1401                                 ndo->ndo_packettype = PT_SNMP;
1402                         else if (ascii_strcasecmp(optarg, "cnfp") == 0)
1403                                 ndo->ndo_packettype = PT_CNFP;
1404                         else if (ascii_strcasecmp(optarg, "tftp") == 0)
1405                                 ndo->ndo_packettype = PT_TFTP;
1406                         else if (ascii_strcasecmp(optarg, "aodv") == 0)
1407                                 ndo->ndo_packettype = PT_AODV;
1408                         else if (ascii_strcasecmp(optarg, "carp") == 0)
1409                                 ndo->ndo_packettype = PT_CARP;
1410                         else if (ascii_strcasecmp(optarg, "radius") == 0)
1411                                 ndo->ndo_packettype = PT_RADIUS;
1412                         else if (ascii_strcasecmp(optarg, "zmtp1") == 0)
1413                                 ndo->ndo_packettype = PT_ZMTP1;
1414                         else if (ascii_strcasecmp(optarg, "vxlan") == 0)
1415                                 ndo->ndo_packettype = PT_VXLAN;
1416                         else if (ascii_strcasecmp(optarg, "pgm") == 0)
1417                                 ndo->ndo_packettype = PT_PGM;
1418                         else if (ascii_strcasecmp(optarg, "pgm_zmtp1") == 0)
1419                                 ndo->ndo_packettype = PT_PGM_ZMTP1;
1420                         else if (ascii_strcasecmp(optarg, "lmp") == 0)
1421                                 ndo->ndo_packettype = PT_LMP;
1422                         else if (ascii_strcasecmp(optarg, "resp") == 0)
1423                                 ndo->ndo_packettype = PT_RESP;
1424                         else
1425                                 error("unknown packet type `%s'", optarg);
1426                         break;
1427
1428                 case 'u':
1429                         ++ndo->ndo_uflag;
1430                         break;
1431
1432 #ifdef HAVE_PCAP_DUMP_FLUSH
1433                 case 'U':
1434                         ++Uflag;
1435                         break;
1436 #endif
1437
1438                 case 'v':
1439                         ++ndo->ndo_vflag;
1440                         break;
1441
1442                 case 'V':
1443                         VFileName = optarg;
1444                         break;
1445
1446                 case 'w':
1447                         WFileName = optarg;
1448                         break;
1449
1450                 case 'W':
1451                         Wflag = atoi(optarg);
1452                         if (Wflag <= 0)
1453                                 error("invalid number of output files %s", optarg);
1454                         WflagChars = getWflagChars(Wflag);
1455                         break;
1456
1457                 case 'x':
1458                         ++ndo->ndo_xflag;
1459                         ++ndo->ndo_suppress_default_print;
1460                         break;
1461
1462                 case 'X':
1463                         ++ndo->ndo_Xflag;
1464                         ++ndo->ndo_suppress_default_print;
1465                         break;
1466
1467                 case 'y':
1468                         yflag_dlt_name = optarg;
1469                         yflag_dlt =
1470                                 pcap_datalink_name_to_val(yflag_dlt_name);
1471                         if (yflag_dlt < 0)
1472                                 error("invalid data link type %s", yflag_dlt_name);
1473                         break;
1474
1475 #ifdef HAVE_PCAP_SET_PARSER_DEBUG
1476                 case 'Y':
1477                         {
1478                         /* Undocumented flag */
1479                         pcap_set_parser_debug(1);
1480                         }
1481                         break;
1482 #endif
1483                 case 'z':
1484                         zflag = optarg;
1485                         break;
1486
1487                 case 'Z':
1488                         username = optarg;
1489                         break;
1490
1491                 case '#':
1492                         ndo->ndo_packet_number = 1;
1493                         break;
1494
1495                 case OPTION_VERSION:
1496                         print_version();
1497                         exit_tcpdump(0);
1498                         break;
1499
1500 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1501                 case OPTION_TSTAMP_PRECISION:
1502                         ndo->ndo_tstamp_precision = tstamp_precision_from_string(optarg);
1503                         if (ndo->ndo_tstamp_precision < 0)
1504                                 error("unsupported time stamp precision");
1505                         break;
1506 #endif
1507
1508 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1509                 case OPTION_IMMEDIATE_MODE:
1510                         immediate_mode = 1;
1511                         break;
1512 #endif
1513
1514                 default:
1515                         print_usage();
1516                         exit_tcpdump(1);
1517                         /* NOTREACHED */
1518                 }
1519
1520 #ifdef HAVE_PCAP_FINDALLDEVS
1521         if (Dflag)
1522                 show_devices_and_exit();
1523 #endif
1524
1525         switch (ndo->ndo_tflag) {
1526
1527         case 0: /* Default */
1528         case 4: /* Default + Date*/
1529                 timezone_offset = gmt2local(0);
1530                 break;
1531
1532         case 1: /* No time stamp */
1533         case 2: /* Unix timeval style */
1534         case 3: /* Microseconds since previous packet */
1535         case 5: /* Microseconds since first packet */
1536                 break;
1537
1538         default: /* Not supported */
1539                 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1540                 break;
1541         }
1542
1543         if (ndo->ndo_fflag != 0 && (VFileName != NULL || RFileName != NULL))
1544                 error("-f can not be used with -V or -r");
1545
1546         if (VFileName != NULL && RFileName != NULL)
1547                 error("-V and -r are mutually exclusive.");
1548
1549 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1550         /*
1551          * If we're printing dissected packets to the standard output
1552          * rather than saving raw packets to a file, and the standard
1553          * output is a terminal, use immediate mode, as the user's
1554          * probably expecting to see packets pop up immediately.
1555          */
1556         if (WFileName == NULL && isatty(1))
1557                 immediate_mode = 1;
1558 #endif
1559
1560 #ifdef WITH_CHROOT
1561         /* if run as root, prepare for chrooting */
1562         if (getuid() == 0 || geteuid() == 0) {
1563                 /* future extensibility for cmd-line arguments */
1564                 if (!chroot_dir)
1565                         chroot_dir = WITH_CHROOT;
1566         }
1567 #endif
1568
1569 #ifdef WITH_USER
1570         /* if run as root, prepare for dropping root privileges */
1571         if (getuid() == 0 || geteuid() == 0) {
1572                 /* Run with '-Z root' to restore old behaviour */
1573                 if (!username)
1574                         username = WITH_USER;
1575         }
1576 #endif
1577
1578         if (RFileName != NULL || VFileName != NULL) {
1579                 /*
1580                  * If RFileName is non-null, it's the pathname of a
1581                  * savefile to read.  If VFileName is non-null, it's
1582                  * the pathname of a file containing a list of pathnames
1583                  * (one per line) of savefiles to read.
1584                  *
1585                  * In either case, we're reading a savefile, not doing
1586                  * a live capture.
1587                  */
1588 #ifndef _WIN32
1589                 /*
1590                  * We don't need network access, so relinquish any set-UID
1591                  * or set-GID privileges we have (if any).
1592                  *
1593                  * We do *not* want set-UID privileges when opening a
1594                  * trace file, as that might let the user read other
1595                  * people's trace files (especially if we're set-UID
1596                  * root).
1597                  */
1598                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1599                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
1600 #endif /* _WIN32 */
1601                 if (VFileName != NULL) {
1602                         if (VFileName[0] == '-' && VFileName[1] == '\0')
1603                                 VFile = stdin;
1604                         else
1605                                 VFile = fopen(VFileName, "r");
1606
1607                         if (VFile == NULL)
1608                                 error("Unable to open file: %s\n", pcap_strerror(errno));
1609
1610                         ret = get_next_file(VFile, VFileLine);
1611                         if (!ret)
1612                                 error("Nothing in %s\n", VFileName);
1613                         RFileName = VFileLine;
1614                 }
1615
1616 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1617                 pd = pcap_open_offline_with_tstamp_precision(RFileName,
1618                     ndo->ndo_tstamp_precision, ebuf);
1619 #else
1620                 pd = pcap_open_offline(RFileName, ebuf);
1621 #endif
1622
1623                 if (pd == NULL)
1624                         error("%s", ebuf);
1625 #ifdef HAVE_CAPSICUM
1626                 cap_rights_init(&rights, CAP_READ);
1627                 if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 &&
1628                     errno != ENOSYS) {
1629                         error("unable to limit pcap descriptor");
1630                 }
1631 #endif
1632                 dlt = pcap_datalink(pd);
1633                 dlt_name = pcap_datalink_val_to_name(dlt);
1634                 if (dlt_name == NULL) {
1635                         fprintf(stderr, "reading from file %s, link-type %u\n",
1636                             RFileName, dlt);
1637                 } else {
1638                         fprintf(stderr,
1639                             "reading from file %s, link-type %s (%s)\n",
1640                             RFileName, dlt_name,
1641                             pcap_datalink_val_to_description(dlt));
1642                 }
1643         } else {
1644                 /*
1645                  * We're doing a live capture.
1646                  */
1647                 if (device == NULL) {
1648                         /*
1649                          * No interface was specified.  Pick one.
1650                          */
1651 #ifdef HAVE_PCAP_FINDALLDEVS
1652                         /*
1653                          * Find the list of interfaces, and pick
1654                          * the first interface.
1655                          */
1656                         if (pcap_findalldevs(&devlist, ebuf) >= 0 &&
1657                             devlist != NULL) {
1658                                 device = strdup(devlist->name);
1659                                 pcap_freealldevs(devlist);
1660                         }
1661 #else /* HAVE_PCAP_FINDALLDEVS */
1662                         /*
1663                          * Use whatever interface pcap_lookupdev()
1664                          * chooses.
1665                          */
1666                         device = pcap_lookupdev(ebuf);
1667 #endif
1668                         if (device == NULL)
1669                                 error("%s", ebuf);
1670                 }
1671
1672                 /*
1673                  * Try to open the interface with the specified name.
1674                  */
1675                 pd = open_interface(device, ndo, ebuf);
1676                 if (pd == NULL) {
1677                         /*
1678                          * That failed.  If we can get a list of
1679                          * interfaces, and the interface name
1680                          * is purely numeric, try to use it as
1681                          * a 1-based index in the list of
1682                          * interfaces.
1683                          */
1684 #ifdef HAVE_PCAP_FINDALLDEVS
1685                         devnum = parse_interface_number(device);
1686                         if (devnum == -1) {
1687                                 /*
1688                                  * It's not a number; just report
1689                                  * the open error and fail.
1690                                  */
1691                                 error("%s", ebuf);
1692                         }
1693
1694                         /*
1695                          * OK, it's a number; try to find the
1696                          * interface with that index, and try
1697                          * to open it.
1698                          *
1699                          * find_interface_by_number() exits if it
1700                          * couldn't be found.
1701                          */
1702                         device = find_interface_by_number(devnum);
1703                         pd = open_interface(device, ndo, ebuf);
1704                         if (pd == NULL)
1705                                 error("%s", ebuf);
1706 #else /* HAVE_PCAP_FINDALLDEVS */
1707                         /*
1708                          * We can't get a list of interfaces; just
1709                          * fail.
1710                          */
1711                         error("%s", ebuf);
1712 #endif /* HAVE_PCAP_FINDALLDEVS */
1713                 }
1714
1715                 /*
1716                  * Let user own process after socket has been opened.
1717                  */
1718 #ifndef _WIN32
1719                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1720                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
1721 #endif /* _WIN32 */
1722 #if !defined(HAVE_PCAP_CREATE) && defined(_WIN32)
1723                 if(Bflag != 0)
1724                         if(pcap_setbuff(pd, Bflag)==-1){
1725                                 error("%s", pcap_geterr(pd));
1726                         }
1727 #endif /* !defined(HAVE_PCAP_CREATE) && defined(_WIN32) */
1728                 if (Lflag)
1729                         show_dlts_and_exit(pd, device);
1730                 if (yflag_dlt >= 0) {
1731 #ifdef HAVE_PCAP_SET_DATALINK
1732                         if (pcap_set_datalink(pd, yflag_dlt) < 0)
1733                                 error("%s", pcap_geterr(pd));
1734 #else
1735                         /*
1736                          * We don't actually support changing the
1737                          * data link type, so we only let them
1738                          * set it to what it already is.
1739                          */
1740                         if (yflag_dlt != pcap_datalink(pd)) {
1741                                 error("%s is not one of the DLTs supported by this device\n",
1742                                       yflag_dlt_name);
1743                         }
1744 #endif
1745                         (void)fprintf(stderr, "%s: data link type %s\n",
1746                                       program_name, yflag_dlt_name);
1747                         (void)fflush(stderr);
1748                 }
1749                 i = pcap_snapshot(pd);
1750                 if (ndo->ndo_snaplen < i) {
1751                         warning("snaplen raised from %d to %d", ndo->ndo_snaplen, i);
1752                         ndo->ndo_snaplen = i;
1753                 }
1754                 if(ndo->ndo_fflag != 0) {
1755                         if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1756                                 warning("foreign (-f) flag used but: %s", ebuf);
1757                         }
1758                 }
1759
1760         }
1761         if (infile)
1762                 cmdbuf = read_infile(infile);
1763         else
1764                 cmdbuf = copy_argv(&argv[optind]);
1765
1766 #ifdef HAVE_PCAP_SET_OPTIMIZER_DEBUG
1767         pcap_set_optimizer_debug(dflag);
1768 #endif
1769         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1770                 error("%s", pcap_geterr(pd));
1771         if (dflag) {
1772                 bpf_dump(&fcode, dflag);
1773                 pcap_close(pd);
1774                 free(cmdbuf);
1775                 pcap_freecode(&fcode);
1776                 exit_tcpdump(0);
1777         }
1778         init_print(ndo, localnet, netmask, timezone_offset);
1779
1780 #ifndef _WIN32
1781         (void)setsignal(SIGPIPE, cleanup);
1782         (void)setsignal(SIGTERM, cleanup);
1783         (void)setsignal(SIGINT, cleanup);
1784 #endif /* _WIN32 */
1785 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1786         (void)setsignal(SIGCHLD, child_cleanup);
1787 #endif
1788         /* Cooperate with nohup(1) */
1789 #ifndef _WIN32
1790         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1791                 (void)setsignal(SIGHUP, oldhandler);
1792 #endif /* _WIN32 */
1793
1794 #ifndef _WIN32
1795         /*
1796          * If a user name was specified with "-Z", attempt to switch to
1797          * that user's UID.  This would probably be used with sudo,
1798          * to allow tcpdump to be run in a special restricted
1799          * account (if you just want to allow users to open capture
1800          * devices, and can't just give users that permission,
1801          * you'd make tcpdump set-UID or set-GID).
1802          *
1803          * Tcpdump doesn't necessarily write only to one savefile;
1804          * the general only way to allow a -Z instance to write to
1805          * savefiles as the user under whose UID it's run, rather
1806          * than as the user specified with -Z, would thus be to switch
1807          * to the original user ID before opening a capture file and
1808          * then switch back to the -Z user ID after opening the savefile.
1809          * Switching to the -Z user ID only after opening the first
1810          * savefile doesn't handle the general case.
1811          */
1812
1813         if (getuid() == 0 || geteuid() == 0) {
1814 #ifdef HAVE_LIBCAP_NG
1815                 /* Initialize capng */
1816                 capng_clear(CAPNG_SELECT_BOTH);
1817                 if (username) {
1818                         capng_updatev(
1819                                 CAPNG_ADD,
1820                                 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
1821                                 CAP_SETUID,
1822                                 CAP_SETGID,
1823                                 -1);
1824                 }
1825                 if (chroot_dir) {
1826                         capng_update(
1827                                 CAPNG_ADD,
1828                                 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
1829                                 CAP_SYS_CHROOT
1830                                 );
1831                 }
1832
1833                 if (WFileName) {
1834                         capng_update(
1835                                 CAPNG_ADD,
1836                                 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
1837                                 CAP_DAC_OVERRIDE
1838                                 );
1839                 }
1840                 capng_apply(CAPNG_SELECT_BOTH);
1841 #endif /* HAVE_LIBCAP_NG */
1842                 if (username || chroot_dir)
1843                         droproot(username, chroot_dir);
1844
1845         }
1846 #endif /* _WIN32 */
1847
1848         if (pcap_setfilter(pd, &fcode) < 0)
1849                 error("%s", pcap_geterr(pd));
1850 #ifdef HAVE_CAPSICUM
1851         if (RFileName == NULL && VFileName == NULL) {
1852                 static const unsigned long cmds[] = { BIOCGSTATS, BIOCROTZBUF };
1853
1854                 /*
1855                  * The various libpcap devices use a combination of
1856                  * read (bpf), ioctl (bpf, netmap), poll (netmap)
1857                  * so we add the relevant access rights.
1858                  */
1859                 cap_rights_init(&rights, CAP_IOCTL, CAP_READ, CAP_EVENT);
1860                 if (cap_rights_limit(pcap_fileno(pd), &rights) < 0 &&
1861                     errno != ENOSYS) {
1862                         error("unable to limit pcap descriptor");
1863                 }
1864                 if (cap_ioctls_limit(pcap_fileno(pd), cmds,
1865                     sizeof(cmds) / sizeof(cmds[0])) < 0 && errno != ENOSYS) {
1866                         error("unable to limit ioctls on pcap descriptor");
1867                 }
1868         }
1869 #endif
1870         if (WFileName) {
1871                 pcap_dumper_t *p;
1872                 /* Do not exceed the default PATH_MAX for files. */
1873                 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1874
1875                 if (dumpinfo.CurrentFileName == NULL)
1876                         error("malloc of dumpinfo.CurrentFileName");
1877
1878                 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1879                 if (Cflag != 0)
1880                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1881                 else
1882                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1883
1884                 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1885 #ifdef HAVE_LIBCAP_NG
1886                 /* Give up CAP_DAC_OVERRIDE capability.
1887                  * Only allow it to be restored if the -C or -G flag have been
1888                  * set since we may need to create more files later on.
1889                  */
1890                 capng_update(
1891                         CAPNG_DROP,
1892                         (Cflag || Gflag ? 0 : CAPNG_PERMITTED)
1893                                 | CAPNG_EFFECTIVE,
1894                         CAP_DAC_OVERRIDE
1895                         );
1896                 capng_apply(CAPNG_SELECT_BOTH);
1897 #endif /* HAVE_LIBCAP_NG */
1898                 if (p == NULL)
1899                         error("%s", pcap_geterr(pd));
1900 #ifdef HAVE_CAPSICUM
1901                 set_dumper_capsicum_rights(p);
1902 #endif
1903                 if (Cflag != 0 || Gflag != 0) {
1904 #ifdef HAVE_CAPSICUM
1905                         dumpinfo.WFileName = strdup(basename(WFileName));
1906                         if (dumpinfo.WFileName == NULL) {
1907                                 error("Unable to allocate memory for file %s",
1908                                     WFileName);
1909                         }
1910                         dumpinfo.dirfd = open(dirname(WFileName),
1911                             O_DIRECTORY | O_RDONLY);
1912                         if (dumpinfo.dirfd < 0) {
1913                                 error("unable to open directory %s",
1914                                     dirname(WFileName));
1915                         }
1916                         cap_rights_init(&rights, CAP_CREATE, CAP_FCNTL,
1917                             CAP_FTRUNCATE, CAP_LOOKUP, CAP_SEEK, CAP_WRITE);
1918                         if (cap_rights_limit(dumpinfo.dirfd, &rights) < 0 &&
1919                             errno != ENOSYS) {
1920                                 error("unable to limit directory rights");
1921                         }
1922                         if (cap_fcntls_limit(dumpinfo.dirfd, CAP_FCNTL_GETFL) < 0 &&
1923                             errno != ENOSYS) {
1924                                 error("unable to limit dump descriptor fcntls");
1925                         }
1926 #else   /* !HAVE_CAPSICUM */
1927                         dumpinfo.WFileName = WFileName;
1928 #endif
1929                         callback = dump_packet_and_trunc;
1930                         dumpinfo.pd = pd;
1931                         dumpinfo.p = p;
1932                         pcap_userdata = (u_char *)&dumpinfo;
1933                 } else {
1934                         callback = dump_packet;
1935                         pcap_userdata = (u_char *)p;
1936                 }
1937 #ifdef HAVE_PCAP_DUMP_FLUSH
1938                 if (Uflag)
1939                         pcap_dump_flush(p);
1940 #endif
1941         } else {
1942                 dlt = pcap_datalink(pd);
1943                 ndo->ndo_if_printer = get_if_printer(ndo, dlt);
1944                 callback = print_packet;
1945                 pcap_userdata = (u_char *)ndo;
1946         }
1947
1948 #ifdef SIGNAL_REQ_INFO
1949         /*
1950          * We can't get statistics when reading from a file rather
1951          * than capturing from a device.
1952          */
1953         if (RFileName == NULL)
1954                 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1955 #endif
1956
1957         if (ndo->ndo_vflag > 0 && WFileName) {
1958                 /*
1959                  * When capturing to a file, "-v" means tcpdump should,
1960                  * every 10 seconds, "v"erbosely report the number of
1961                  * packets captured.
1962                  */
1963 #ifdef USE_WIN32_MM_TIMER
1964                 /* call verbose_stats_dump() each 1000 +/-100msec */
1965                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1966                 setvbuf(stderr, NULL, _IONBF, 0);
1967 #elif defined(HAVE_ALARM)
1968                 (void)setsignal(SIGALRM, verbose_stats_dump);
1969                 alarm(1);
1970 #endif
1971         }
1972
1973         if (RFileName == NULL) {
1974                 /*
1975                  * Live capture (if -V was specified, we set RFileName
1976                  * to a file from the -V file).  Print a message to
1977                  * the standard error on UN*X.
1978                  */
1979                 if (!ndo->ndo_vflag && !WFileName) {
1980                         (void)fprintf(stderr,
1981                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1982                             program_name);
1983                 } else
1984                         (void)fprintf(stderr, "%s: ", program_name);
1985                 dlt = pcap_datalink(pd);
1986                 dlt_name = pcap_datalink_val_to_name(dlt);
1987                 if (dlt_name == NULL) {
1988                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1989                             device, dlt, ndo->ndo_snaplen);
1990                 } else {
1991                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1992                             device, dlt_name,
1993                             pcap_datalink_val_to_description(dlt), ndo->ndo_snaplen);
1994                 }
1995                 (void)fflush(stderr);
1996         }
1997
1998 #ifdef HAVE_CAPSICUM
1999         cansandbox = (ndo->ndo_nflag && VFileName == NULL && zflag == NULL);
2000         if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
2001                 error("unable to enter the capability mode");
2002 #endif  /* HAVE_CAPSICUM */
2003
2004         do {
2005                 status = pcap_loop(pd, cnt, callback, pcap_userdata);
2006                 if (WFileName == NULL) {
2007                         /*
2008                          * We're printing packets.  Flush the printed output,
2009                          * so it doesn't get intermingled with error output.
2010                          */
2011                         if (status == -2) {
2012                                 /*
2013                                  * We got interrupted, so perhaps we didn't
2014                                  * manage to finish a line we were printing.
2015                                  * Print an extra newline, just in case.
2016                                  */
2017                                 putchar('\n');
2018                         }
2019                         (void)fflush(stdout);
2020                 }
2021                 if (status == -2) {
2022                         /*
2023                          * We got interrupted. If we are reading multiple
2024                          * files (via -V) set these so that we stop.
2025                          */
2026                         VFileName = NULL;
2027                         ret = NULL;
2028                 }
2029                 if (status == -1) {
2030                         /*
2031                          * Error.  Report it.
2032                          */
2033                         (void)fprintf(stderr, "%s: pcap_loop: %s\n",
2034                             program_name, pcap_geterr(pd));
2035                 }
2036                 if (RFileName == NULL) {
2037                         /*
2038                          * We're doing a live capture.  Report the capture
2039                          * statistics.
2040                          */
2041                         info(1);
2042                 }
2043                 pcap_close(pd);
2044                 if (VFileName != NULL) {
2045                         ret = get_next_file(VFile, VFileLine);
2046                         if (ret) {
2047                                 int new_dlt;
2048
2049                                 RFileName = VFileLine;
2050                                 pd = pcap_open_offline(RFileName, ebuf);
2051                                 if (pd == NULL)
2052                                         error("%s", ebuf);
2053 #ifdef HAVE_CAPSICUM
2054                                 cap_rights_init(&rights, CAP_READ);
2055                                 if (cap_rights_limit(fileno(pcap_file(pd)),
2056                                     &rights) < 0 && errno != ENOSYS) {
2057                                         error("unable to limit pcap descriptor");
2058                                 }
2059 #endif
2060                                 new_dlt = pcap_datalink(pd);
2061                                 if (new_dlt != dlt) {
2062                                         /*
2063                                          * The new file has a different
2064                                          * link-layer header type from the
2065                                          * previous one.
2066                                          */
2067                                         if (WFileName != NULL) {
2068                                                 /*
2069                                                  * We're writing raw packets
2070                                                  * that match the filter to
2071                                                  * a pcap file.  pcap files
2072                                                  * don't support multiple
2073                                                  * different link-layer
2074                                                  * header types, so we fail
2075                                                  * here.
2076                                                  */
2077                                                 error("%s: new dlt does not match original", RFileName);
2078                                         }
2079
2080                                         /*
2081                                          * We're printing the decoded packets;
2082                                          * switch to the new DLT.
2083                                          *
2084                                          * To do that, we need to change
2085                                          * the printer, change the DLT name,
2086                                          * and recompile the filter with
2087                                          * the new DLT.
2088                                          */
2089                                         dlt = new_dlt;
2090                                         ndo->ndo_if_printer = get_if_printer(ndo, dlt);
2091                                         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
2092                                                 error("%s", pcap_geterr(pd));
2093                                 }
2094
2095                                 /*
2096                                  * Set the filter on the new file.
2097                                  */
2098                                 if (pcap_setfilter(pd, &fcode) < 0)
2099                                         error("%s", pcap_geterr(pd));
2100
2101                                 /*
2102                                  * Report the new file.
2103                                  */
2104                                 dlt_name = pcap_datalink_val_to_name(dlt);
2105                                 if (dlt_name == NULL) {
2106                                         fprintf(stderr, "reading from file %s, link-type %u\n",
2107                                             RFileName, dlt);
2108                                 } else {
2109                                         fprintf(stderr,
2110                                         "reading from file %s, link-type %s (%s)\n",
2111                                             RFileName, dlt_name,
2112                                             pcap_datalink_val_to_description(dlt));
2113                                 }
2114                         }
2115                 }
2116         }
2117         while (ret != NULL);
2118
2119         free(cmdbuf);
2120         pcap_freecode(&fcode);
2121         exit_tcpdump(status == -1 ? 1 : 0);
2122 }
2123
2124 /* make a clean exit on interrupts */
2125 static RETSIGTYPE
2126 cleanup(int signo _U_)
2127 {
2128 #ifdef USE_WIN32_MM_TIMER
2129         if (timer_id)
2130                 timeKillEvent(timer_id);
2131         timer_id = 0;
2132 #elif defined(HAVE_ALARM)
2133         alarm(0);
2134 #endif
2135
2136 #ifdef HAVE_PCAP_BREAKLOOP
2137         /*
2138          * We have "pcap_breakloop()"; use it, so that we do as little
2139          * as possible in the signal handler (it's probably not safe
2140          * to do anything with standard I/O streams in a signal handler -
2141          * the ANSI C standard doesn't say it is).
2142          */
2143         pcap_breakloop(pd);
2144 #else
2145         /*
2146          * We don't have "pcap_breakloop()"; this isn't safe, but
2147          * it's the best we can do.  Print the summary if we're
2148          * not reading from a savefile - i.e., if we're doing a
2149          * live capture - and exit.
2150          */
2151         if (pd != NULL && pcap_file(pd) == NULL) {
2152                 /*
2153                  * We got interrupted, so perhaps we didn't
2154                  * manage to finish a line we were printing.
2155                  * Print an extra newline, just in case.
2156                  */
2157                 putchar('\n');
2158                 (void)fflush(stdout);
2159                 info(1);
2160         }
2161         exit_tcpdump(0);
2162 #endif
2163 }
2164
2165 /*
2166   On windows, we do not use a fork, so we do not care less about
2167   waiting a child processes to die
2168  */
2169 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2170 static RETSIGTYPE
2171 child_cleanup(int signo _U_)
2172 {
2173   wait(NULL);
2174 }
2175 #endif /* HAVE_FORK && HAVE_VFORK */
2176
2177 static void
2178 info(register int verbose)
2179 {
2180         struct pcap_stat stats;
2181
2182         /*
2183          * Older versions of libpcap didn't set ps_ifdrop on some
2184          * platforms; initialize it to 0 to handle that.
2185          */
2186         stats.ps_ifdrop = 0;
2187         if (pcap_stats(pd, &stats) < 0) {
2188                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
2189                 infoprint = 0;
2190                 return;
2191         }
2192
2193         if (!verbose)
2194                 fprintf(stderr, "%s: ", program_name);
2195
2196         (void)fprintf(stderr, "%u packet%s captured", packets_captured,
2197             PLURAL_SUFFIX(packets_captured));
2198         if (!verbose)
2199                 fputs(", ", stderr);
2200         else
2201                 putc('\n', stderr);
2202         (void)fprintf(stderr, "%u packet%s received by filter", stats.ps_recv,
2203             PLURAL_SUFFIX(stats.ps_recv));
2204         if (!verbose)
2205                 fputs(", ", stderr);
2206         else
2207                 putc('\n', stderr);
2208         (void)fprintf(stderr, "%u packet%s dropped by kernel", stats.ps_drop,
2209             PLURAL_SUFFIX(stats.ps_drop));
2210         if (stats.ps_ifdrop != 0) {
2211                 if (!verbose)
2212                         fputs(", ", stderr);
2213                 else
2214                         putc('\n', stderr);
2215                 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
2216                     stats.ps_ifdrop, PLURAL_SUFFIX(stats.ps_ifdrop));
2217         } else
2218                 putc('\n', stderr);
2219         infoprint = 0;
2220 }
2221
2222 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2223 #ifdef HAVE_FORK
2224 #define fork_subprocess() fork()
2225 #else
2226 #define fork_subprocess() vfork()
2227 #endif
2228 static void
2229 compress_savefile(const char *filename)
2230 {
2231         pid_t child;
2232
2233         child = fork_subprocess();
2234         if (child == -1) {
2235                 fprintf(stderr,
2236                         "compress_savefile: fork failed: %s\n",
2237                         pcap_strerror(errno));
2238                 return;
2239         }
2240         if (child != 0) {
2241                 /* Parent process. */
2242                 return;
2243         }
2244
2245         /*
2246          * Child process.
2247          * Set to lowest priority so that this doesn't disturb the capture.
2248          */
2249 #ifdef NZERO
2250         setpriority(PRIO_PROCESS, 0, NZERO - 1);
2251 #else
2252         setpriority(PRIO_PROCESS, 0, 19);
2253 #endif
2254         if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
2255                 fprintf(stderr,
2256                         "compress_savefile: execlp(%s, %s) failed: %s\n",
2257                         zflag,
2258                         filename,
2259                         pcap_strerror(errno));
2260 #ifdef HAVE_FORK
2261         exit(1);
2262 #else
2263         _exit(1);
2264 #endif
2265 }
2266 #else  /* HAVE_FORK && HAVE_VFORK */
2267 static void
2268 compress_savefile(const char *filename)
2269 {
2270         fprintf(stderr,
2271                 "compress_savefile failed. Functionality not implemented under your system\n");
2272 }
2273 #endif /* HAVE_FORK && HAVE_VFORK */
2274
2275 static void
2276 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2277 {
2278         struct dump_info *dump_info;
2279
2280         ++packets_captured;
2281
2282         ++infodelay;
2283
2284         dump_info = (struct dump_info *)user;
2285
2286         /*
2287          * XXX - this won't force the file to rotate on the specified time
2288          * boundary, but it will rotate on the first packet received after the
2289          * specified Gflag number of seconds. Note: if a Gflag time boundary
2290          * and a Cflag size boundary coincide, the time rotation will occur
2291          * first thereby cancelling the Cflag boundary (since the file should
2292          * be 0).
2293          */
2294         if (Gflag != 0) {
2295                 /* Check if it is time to rotate */
2296                 time_t t;
2297
2298                 /* Get the current time */
2299                 if ((t = time(NULL)) == (time_t)-1) {
2300                         error("dump_and_trunc_packet: can't get current_time: %s",
2301                             pcap_strerror(errno));
2302                 }
2303
2304
2305                 /* If the time is greater than the specified window, rotate */
2306                 if (t - Gflag_time >= Gflag) {
2307 #ifdef HAVE_CAPSICUM
2308                         FILE *fp;
2309                         int fd;
2310 #endif
2311
2312                         /* Update the Gflag_time */
2313                         Gflag_time = t;
2314                         /* Update Gflag_count */
2315                         Gflag_count++;
2316                         /*
2317                          * Close the current file and open a new one.
2318                          */
2319                         pcap_dump_close(dump_info->p);
2320
2321                         /*
2322                          * Compress the file we just closed, if the user asked for it
2323                          */
2324                         if (zflag != NULL)
2325                                 compress_savefile(dump_info->CurrentFileName);
2326
2327                         /*
2328                          * Check to see if we've exceeded the Wflag (when
2329                          * not using Cflag).
2330                          */
2331                         if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
2332                                 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
2333                                     Wflag);
2334                                 info(1);
2335                                 exit_tcpdump(0);
2336                                 /* NOTREACHED */
2337                         }
2338                         if (dump_info->CurrentFileName != NULL)
2339                                 free(dump_info->CurrentFileName);
2340                         /* Allocate space for max filename + \0. */
2341                         dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2342                         if (dump_info->CurrentFileName == NULL)
2343                                 error("dump_packet_and_trunc: malloc");
2344                         /*
2345                          * Gflag was set otherwise we wouldn't be here. Reset the count
2346                          * so multiple files would end with 1,2,3 in the filename.
2347                          * The counting is handled with the -C flow after this.
2348                          */
2349                         Cflag_count = 0;
2350
2351                         /*
2352                          * This is always the first file in the Cflag
2353                          * rotation: e.g. 0
2354                          * We also don't need numbering if Cflag is not set.
2355                          */
2356                         if (Cflag != 0)
2357                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
2358                                     WflagChars);
2359                         else
2360                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
2361
2362 #ifdef HAVE_LIBCAP_NG
2363                         capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2364                         capng_apply(CAPNG_SELECT_BOTH);
2365 #endif /* HAVE_LIBCAP_NG */
2366 #ifdef HAVE_CAPSICUM
2367                         fd = openat(dump_info->dirfd,
2368                             dump_info->CurrentFileName,
2369                             O_CREAT | O_WRONLY | O_TRUNC, 0644);
2370                         if (fd < 0) {
2371                                 error("unable to open file %s",
2372                                     dump_info->CurrentFileName);
2373                         }
2374                         fp = fdopen(fd, "w");
2375                         if (fp == NULL) {
2376                                 error("unable to fdopen file %s",
2377                                     dump_info->CurrentFileName);
2378                         }
2379                         dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
2380 #else   /* !HAVE_CAPSICUM */
2381                         dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2382 #endif
2383 #ifdef HAVE_LIBCAP_NG
2384                         capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2385                         capng_apply(CAPNG_SELECT_BOTH);
2386 #endif /* HAVE_LIBCAP_NG */
2387                         if (dump_info->p == NULL)
2388                                 error("%s", pcap_geterr(pd));
2389 #ifdef HAVE_CAPSICUM
2390                         set_dumper_capsicum_rights(dump_info->p);
2391 #endif
2392                 }
2393         }
2394
2395         /*
2396          * XXX - this won't prevent capture files from getting
2397          * larger than Cflag - the last packet written to the
2398          * file could put it over Cflag.
2399          */
2400         if (Cflag != 0) {
2401                 long size = pcap_dump_ftell(dump_info->p);
2402
2403                 if (size == -1)
2404                         error("ftell fails on output file");
2405                 if (size > Cflag) {
2406 #ifdef HAVE_CAPSICUM
2407                         FILE *fp;
2408                         int fd;
2409 #endif
2410
2411                         /*
2412                          * Close the current file and open a new one.
2413                          */
2414                         pcap_dump_close(dump_info->p);
2415
2416                         /*
2417                          * Compress the file we just closed, if the user
2418                          * asked for it.
2419                          */
2420                         if (zflag != NULL)
2421                                 compress_savefile(dump_info->CurrentFileName);
2422
2423                         Cflag_count++;
2424                         if (Wflag > 0) {
2425                                 if (Cflag_count >= Wflag)
2426                                         Cflag_count = 0;
2427                         }
2428                         if (dump_info->CurrentFileName != NULL)
2429                                 free(dump_info->CurrentFileName);
2430                         dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2431                         if (dump_info->CurrentFileName == NULL)
2432                                 error("dump_packet_and_trunc: malloc");
2433                         MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
2434 #ifdef HAVE_LIBCAP_NG
2435                         capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2436                         capng_apply(CAPNG_SELECT_BOTH);
2437 #endif /* HAVE_LIBCAP_NG */
2438 #ifdef HAVE_CAPSICUM
2439                         fd = openat(dump_info->dirfd, dump_info->CurrentFileName,
2440                             O_CREAT | O_WRONLY | O_TRUNC, 0644);
2441                         if (fd < 0) {
2442                                 error("unable to open file %s",
2443                                     dump_info->CurrentFileName);
2444                         }
2445                         fp = fdopen(fd, "w");
2446                         if (fp == NULL) {
2447                                 error("unable to fdopen file %s",
2448                                     dump_info->CurrentFileName);
2449                         }
2450                         dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
2451 #else   /* !HAVE_CAPSICUM */
2452                         dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2453 #endif
2454 #ifdef HAVE_LIBCAP_NG
2455                         capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2456                         capng_apply(CAPNG_SELECT_BOTH);
2457 #endif /* HAVE_LIBCAP_NG */
2458                         if (dump_info->p == NULL)
2459                                 error("%s", pcap_geterr(pd));
2460 #ifdef HAVE_CAPSICUM
2461                         set_dumper_capsicum_rights(dump_info->p);
2462 #endif
2463                 }
2464         }
2465
2466         pcap_dump((u_char *)dump_info->p, h, sp);
2467 #ifdef HAVE_PCAP_DUMP_FLUSH
2468         if (Uflag)
2469                 pcap_dump_flush(dump_info->p);
2470 #endif
2471
2472         --infodelay;
2473         if (infoprint)
2474                 info(0);
2475 }
2476
2477 static void
2478 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2479 {
2480         ++packets_captured;
2481
2482         ++infodelay;
2483
2484         pcap_dump(user, h, sp);
2485 #ifdef HAVE_PCAP_DUMP_FLUSH
2486         if (Uflag)
2487                 pcap_dump_flush((pcap_dumper_t *)user);
2488 #endif
2489
2490         --infodelay;
2491         if (infoprint)
2492                 info(0);
2493 }
2494
2495 static void
2496 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2497 {
2498         ++packets_captured;
2499
2500         ++infodelay;
2501
2502         pretty_print_packet((netdissect_options *)user, h, sp, packets_captured);
2503
2504         --infodelay;
2505         if (infoprint)
2506                 info(0);
2507 }
2508
2509 #ifdef _WIN32
2510         /*
2511          * XXX - there should really be libpcap calls to get the version
2512          * number as a string (the string would be generated from #defines
2513          * at run time, so that it's not generated from string constants
2514          * in the library, as, on many UNIX systems, those constants would
2515          * be statically linked into the application executable image, and
2516          * would thus reflect the version of libpcap on the system on
2517          * which the application was *linked*, not the system on which it's
2518          * *running*.
2519          *
2520          * That routine should be documented, unlike the "version[]"
2521          * string, so that UNIX vendors providing their own libpcaps
2522          * don't omit it (as a couple of vendors have...).
2523          *
2524          * Packet.dll should perhaps also export a routine to return the
2525          * version number of the Packet.dll code, to supply the
2526          * "Wpcap_version" information on Windows.
2527          */
2528         char WDversion[]="current-git.tcpdump.org";
2529 #if !defined(HAVE_GENERATED_VERSION)
2530         char version[]="current-git.tcpdump.org";
2531 #endif
2532         char pcap_version[]="current-git.tcpdump.org";
2533         char Wpcap_version[]="3.1";
2534 #endif
2535
2536 #ifdef SIGNAL_REQ_INFO
2537 RETSIGTYPE requestinfo(int signo _U_)
2538 {
2539         if (infodelay)
2540                 ++infoprint;
2541         else
2542                 info(0);
2543 }
2544 #endif
2545
2546 /*
2547  * Called once each second in verbose mode while dumping to file
2548  */
2549 #ifdef USE_WIN32_MM_TIMER
2550 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2551                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2552 {
2553         if (infodelay == 0)
2554                 fprintf(stderr, "Got %u\r", packets_captured);
2555 }
2556 #elif defined(HAVE_ALARM)
2557 static void verbose_stats_dump(int sig _U_)
2558 {
2559         if (infodelay == 0)
2560                 fprintf(stderr, "Got %u\r", packets_captured);
2561         alarm(1);
2562 }
2563 #endif
2564
2565 USES_APPLE_DEPRECATED_API
2566 static void
2567 print_version(void)
2568 {
2569         extern char version[];
2570 #ifndef HAVE_PCAP_LIB_VERSION
2571 #if defined(_WIN32) || defined(HAVE_PCAP_VERSION)
2572         extern char pcap_version[];
2573 #else /* defined(_WIN32) || defined(HAVE_PCAP_VERSION) */
2574         static char pcap_version[] = "unknown";
2575 #endif /* defined(_WIN32) || defined(HAVE_PCAP_VERSION) */
2576 #endif /* HAVE_PCAP_LIB_VERSION */
2577         const char *smi_version_string;
2578
2579 #ifdef HAVE_PCAP_LIB_VERSION
2580 #ifdef _WIN32
2581         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2582 #else /* _WIN32 */
2583         (void)fprintf(stderr, "%s version %s\n", program_name, version);
2584 #endif /* _WIN32 */
2585         (void)fprintf(stderr, "%s\n",pcap_lib_version());
2586 #else /* HAVE_PCAP_LIB_VERSION */
2587 #ifdef _WIN32
2588         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2589         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2590 #else /* _WIN32 */
2591         (void)fprintf(stderr, "%s version %s\n", program_name, version);
2592         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2593 #endif /* _WIN32 */
2594 #endif /* HAVE_PCAP_LIB_VERSION */
2595
2596 #if defined(HAVE_LIBCRYPTO) && defined(SSLEAY_VERSION)
2597         (void)fprintf (stderr, "%s\n", SSLeay_version(SSLEAY_VERSION));
2598 #endif
2599
2600         smi_version_string = nd_smi_version_string();
2601         if (smi_version_string != NULL)
2602                 (void)fprintf (stderr, "SMI-library: %s\n", smi_version_string);
2603
2604 #if defined(__SANITIZE_ADDRESS__)
2605         (void)fprintf (stderr, "Compiled with AddressSanitizer/GCC.\n");
2606 #elif defined(__has_feature)
2607 #  if __has_feature(address_sanitizer)
2608         (void)fprintf (stderr, "Compiled with AddressSanitizer/CLang.\n");
2609 #  endif
2610 #endif /* __SANITIZE_ADDRESS__ or __has_feature */
2611 }
2612 USES_APPLE_RST
2613
2614 static void
2615 print_usage(void)
2616 {
2617         print_version();
2618         (void)fprintf(stderr,
2619 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqStu" U_FLAG "vxX#]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2620         (void)fprintf(stderr,
2621 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2622         (void)fprintf(stderr,
2623 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ] [ --number ]\n");
2624 #ifdef HAVE_PCAP_SETDIRECTION
2625         (void)fprintf(stderr,
2626 "\t\t[ -Q in|out|inout ]\n");
2627 #endif
2628         (void)fprintf(stderr,
2629 "\t\t[ -r file ] [ -s snaplen ] ");
2630 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
2631         (void)fprintf(stderr, "[ --time-stamp-precision precision ]\n");
2632         (void)fprintf(stderr,
2633 "\t\t");
2634 #endif
2635 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
2636         (void)fprintf(stderr, "[ --immediate-mode ] ");
2637 #endif
2638         (void)fprintf(stderr, "[ -T type ] [ --version ] [ -V file ]\n");
2639         (void)fprintf(stderr,
2640 "\t\t[ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z postrotate-command ]\n");
2641         (void)fprintf(stderr,
2642 "\t\t[ -Z user ] [ expression ]\n");
2643 }
2644 /*
2645  * Local Variables:
2646  * c-style: whitesmith
2647  * c-basic-offset: 8
2648  * End:
2649  */