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 /*
  29  * tcpdump - dump traffic on a network
  30  *
  31  * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
  32  * Mercilessly hacked and occasionally improved since then via the
  33  * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
  34  */
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include <config.h>
  38 #endif
  39
  40 /*
  41  * Some older versions of Mac OS X may ship pcap.h from libpcap 0.6 with a
  42  * libpcap based on 0.8.  That means it has pcap_findalldevs() but the
  43  * header doesn't define pcap_if_t, meaning that we can't actually *use*
  44  * pcap_findalldevs().
  45  */
  46 #ifdef HAVE_PCAP_FINDALLDEVS
  47 #ifndef HAVE_PCAP_IF_T
  48 #undef HAVE_PCAP_FINDALLDEVS
  49 #endif
  50 #endif
  51
  52 #include "netdissect-stdinc.h"
  53
  54 /*
  55  * This must appear after including netdissect-stdinc.h, so that _U_ is
  56  * defined.
  57  */
  58 #ifndef lint
  59 static const char copyright[] _U_ =
  60     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
  61 The Regents of the University of California.  All rights reserved.\n";
  62 #endif
  63
  64 #include <sys/stat.h>
  65
  66 #ifdef HAVE_FCNTL_H
  67 #include <fcntl.h>
  68 #endif
  69
  70 #ifdef HAVE_LIBCRYPTO
  71 #include <openssl/crypto.h>
  72 #endif
  73
  74 #ifdef HAVE_GETOPT_LONG
  75 #include <getopt.h>
  76 #else
  77 #include "missing/getopt_long.h"
  78 #endif
  79 /* Capsicum-specific code requires macros from <net/bpf.h>, which will fail
  80  * to compile if <pcap.h> has already been included; including the headers
  81  * in the opposite order works fine.
  82  */
  83 #ifdef HAVE_CAPSICUM
  84 #include <sys/capsicum.h>
  85 #include <sys/ioccom.h>
  86 #include <net/bpf.h>
  87 #include <libgen.h>
  88 #ifdef HAVE_CASPER
  89 #include <libcasper.h>
  90 #include <casper/cap_dns.h>
  91 #include <sys/nv.h>
  92 #endif  /* HAVE_CASPER */
  93 #endif  /* HAVE_CAPSICUM */
  94 #ifdef HAVE_PCAP_OPEN
  95 /*
  96  * We found pcap_open() in the capture library, so we'll be using
  97  * the remote capture APIs; define PCAP_REMOTE before we include pcap.h,
  98  * so we get those APIs declared, and the types and #defines that they
  99  * use defined.
 100  *
 101  * WinPcap's headers require that PCAP_REMOTE be defined in order to get
 102  * remote-capture APIs declared and types and #defines that they use
 103  * defined.
 104  *
 105  * (Versions of libpcap with those APIs, and thus Npcap, which is based on
 106  * those versions of libpcap, don't require it.)
 107  */
 108 #define HAVE_REMOTE
 109 #endif
 110 #include <pcap.h>
 111 #include <signal.h>
 112 #include <stdio.h>
 113 #include <stdarg.h>
 114 #include <stdlib.h>
 115 #include <string.h>
 116 #include <limits.h>
 117 #ifdef _WIN32
 118 #include <windows.h>
 119 #else
 120 #include <sys/time.h>
 121 #include <sys/wait.h>
 122 #include <sys/resource.h>
 123 #include <pwd.h>
 124 #include <grp.h>
 125 #endif /* _WIN32 */
 126
 127 /*
 128  * Pathname separator.
 129  * Use this in pathnames, but do *not* use it in URLs.
 130  */
 131 #ifdef _WIN32
 132 #define PATH_SEPARATOR  '\\'
 133 #else
 134 #define PATH_SEPARATOR  '/'
 135 #endif
 136
 137 /* capabilities convenience library */
 138 /* If a code depends on HAVE_LIBCAP_NG, it depends also on HAVE_CAP_NG_H.
 139  * If HAVE_CAP_NG_H is not defined, undefine HAVE_LIBCAP_NG.
 140  * Thus, the later tests are done only on HAVE_LIBCAP_NG.
 141  */
 142 #ifdef HAVE_LIBCAP_NG
 143 #ifdef HAVE_CAP_NG_H
 144 #include <cap-ng.h>
 145 #else
 146 #undef HAVE_LIBCAP_NG
 147 #endif /* HAVE_CAP_NG_H */
 148 #endif /* HAVE_LIBCAP_NG */
 149
 150 #ifdef __FreeBSD__
 151 #include <sys/sysctl.h>
 152 #endif /* __FreeBSD__ */
 153
 154 #include "netdissect-stdinc.h"
 155 #include "netdissect.h"
 156 #include "interface.h"
 157 #include "addrtoname.h"
 158 #include "machdep.h"
 159 #include "pcap-missing.h"
 160 #include "ascii_strcasecmp.h"
 161
 162 #include "print.h"
 163
 164 #include "fptype.h"
 165
 166 #ifndef PATH_MAX
 167 #define PATH_MAX 1024
 168 #endif
 169
 170 #if defined(SIGINFO)
 171 #define SIGNAL_REQ_INFO SIGINFO
 172 #elif defined(SIGUSR1)
 173 #define SIGNAL_REQ_INFO SIGUSR1
 174 #endif
 175
 176 #if defined(HAVE_PCAP_DUMP_FLUSH) && defined(SIGUSR2)
 177 #define SIGNAL_FLUSH_PCAP SIGUSR2
 178 #endif
 179
 180 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
 181 static int Bflag;                       /* buffer size */
 182 #endif
 183 #ifdef HAVE_PCAP_DUMP_FTELL64
 184 static int64_t Cflag;                   /* rotate dump files after this many bytes */
 185 #else
 186 static long Cflag;                      /* rotate dump files after this many bytes */
 187 #endif
 188 static int Cflag_count;                 /* Keep track of which file number we're writing */
 189 #ifdef HAVE_PCAP_FINDALLDEVS
 190 static int Dflag;                       /* list available devices and exit */
 191 #endif
 192 #ifdef HAVE_PCAP_FINDALLDEVS_EX
 193 static char *remote_interfaces_source;  /* list available devices from this source and exit */
 194 #endif
 195
 196 /*
 197  * This is exported because, in some versions of libpcap, if libpcap
 198  * is built with optimizer debugging code (which is *NOT* the default
 199  * configuration!), the library *imports*(!) a variable named dflag,
 200  * under the expectation that tcpdump is exporting it, to govern
 201  * how much debugging information to print when optimizing
 202  * the generated BPF code.
 203  *
 204  * This is a horrible hack; newer versions of libpcap don't import
 205  * dflag but, instead, *if* built with optimizer debugging code,
 206  * *export* a routine to set that flag.
 207  */
 208 extern int dflag;
 209 int dflag;                              /* print filter code */
 210 static int Gflag;                       /* rotate dump files after this many seconds */
 211 static int Gflag_count;                 /* number of files created with Gflag rotation */
 212 static time_t Gflag_time;               /* The last time_t the dump file was rotated. */
 213 static int Lflag;                       /* list available data link types and exit */
 214 static int Iflag;                       /* rfmon (monitor) mode */
 215 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 216 static int Jflag;                       /* list available time stamp types */
 217 static int jflag = -1;                  /* packet time stamp source */
 218 #endif
 219 static int lflag;                       /* line-buffered output */
 220 static int pflag;                       /* don't go promiscuous */
 221 #ifdef HAVE_PCAP_SETDIRECTION
 222 static int Qflag = -1;                  /* restrict captured packet by send/receive direction */
 223 #endif
 224 #ifdef HAVE_PCAP_DUMP_FLUSH
 225 static int Uflag;                       /* "unbuffered" output of dump files */
 226 #endif
 227 static int Wflag;                       /* recycle output files after this number of files */
 228 static int WflagChars;
 229 static char *zflag = NULL;              /* compress each savefile using a specified command (like gzip or bzip2) */
 230 static int timeout = 1000;              /* default timeout = 1000 ms = 1 s */
 231 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
 232 static int immediate_mode;
 233 #endif
 234 static int count_mode;
 235
 236 static int infodelay;
 237 static int infoprint;
 238
 239 char *program_name;
 240
 241 #ifdef HAVE_CASPER
 242 cap_channel_t *capdns;
 243 #endif
 244
 245 /* Forwards */
 246 static NORETURN void error(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2);
 247 static void warning(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2);
 248 static NORETURN void exit_tcpdump(int);
 249 static void (*setsignal (int sig, void (*func)(int)))(int);
 250 static void cleanup(int);
 251 static void child_cleanup(int);
 252 static void print_version(FILE *);
 253 static void print_usage(FILE *);
 254 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 255 static NORETURN void show_tstamp_types_and_exit(pcap_t *, const char *device);
 256 #endif
 257 static NORETURN void show_dlts_and_exit(pcap_t *, const char *device);
 258 #ifdef HAVE_PCAP_FINDALLDEVS
 259 static NORETURN void show_devices_and_exit(void);
 260 #endif
 261 #ifdef HAVE_PCAP_FINDALLDEVS_EX
 262 static NORETURN void show_remote_devices_and_exit(void);
 263 #endif
 264
 265 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 266 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
 267 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
 268 static void droproot(const char *, const char *);
 269
 270 #ifdef SIGNAL_REQ_INFO
 271 static void requestinfo(int);
 272 #endif
 273
 274 #ifdef SIGNAL_FLUSH_PCAP
 275 static void flushpcap(int);
 276 #endif
 277
 278 #ifdef _WIN32
 279     static HANDLE timer_handle = INVALID_HANDLE_VALUE;
 280     static void CALLBACK verbose_stats_dump(PVOID param, BOOLEAN timer_fired);
 281 #else /* _WIN32 */
 282   static void verbose_stats_dump(int sig);
 283 #endif /* _WIN32 */
 284
 285 static void info(int);
 286 static u_int packets_captured;
 287
 288 #ifdef HAVE_PCAP_FINDALLDEVS
 289 static const struct tok status_flags[] = {
 290 #ifdef PCAP_IF_UP
 291         { PCAP_IF_UP,       "Up"       },
 292 #endif
 293 #ifdef PCAP_IF_RUNNING
 294         { PCAP_IF_RUNNING,  "Running"  },
 295 #endif
 296         { PCAP_IF_LOOPBACK, "Loopback" },
 297 #ifdef PCAP_IF_WIRELESS
 298         { PCAP_IF_WIRELESS, "Wireless" },
 299 #endif
 300         { 0, NULL }
 301 };
 302 #endif
 303
 304 static pcap_t *pd;
 305 static pcap_dumper_t *pdd = NULL;
 306
 307 static int supports_monitor_mode;
 308
 309 extern int optind;
 310 extern int opterr;
 311 extern char *optarg;
 312
 313 struct dump_info {
 314         char    *WFileName;
 315         char    *CurrentFileName;
 316         pcap_t  *pd;
 317         pcap_dumper_t *pdd;
 318         netdissect_options *ndo;
 319 #ifdef HAVE_CAPSICUM
 320         int     dirfd;
 321 #endif
 322 };
 323
 324 #if defined(HAVE_PCAP_SET_PARSER_DEBUG)
 325 /*
 326  * We have pcap_set_parser_debug() in libpcap; declare it (it's not declared
 327  * by any libpcap header, because it's a special hack, only available if
 328  * libpcap was configured to include it, and only intended for use by
 329  * libpcap developers trying to debug the parser for filter expressions).
 330  */
 331 #ifdef _WIN32
 332 __declspec(dllimport)
 333 #else /* _WIN32 */
 334 extern
 335 #endif /* _WIN32 */
 336 void pcap_set_parser_debug(int);
 337 #elif defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
 338 /*
 339  * We don't have pcap_set_parser_debug() in libpcap, but we do have
 340  * pcap_debug or yydebug.  Make a local version of pcap_set_parser_debug()
 341  * to set the flag, and define HAVE_PCAP_SET_PARSER_DEBUG.
 342  */
 343 static void
 344 pcap_set_parser_debug(int value)
 345 {
 346 #ifdef HAVE_PCAP_DEBUG
 347         extern int pcap_debug;
 348
 349         pcap_debug = value;
 350 #else /* HAVE_PCAP_DEBUG */
 351         extern int yydebug;
 352
 353         yydebug = value;
 354 #endif /* HAVE_PCAP_DEBUG */
 355 }
 356
 357 #define HAVE_PCAP_SET_PARSER_DEBUG
 358 #endif
 359
 360 #if defined(HAVE_PCAP_SET_OPTIMIZER_DEBUG)
 361 /*
 362  * We have pcap_set_optimizer_debug() in libpcap; declare it (it's not declared
 363  * by any libpcap header, because it's a special hack, only available if
 364  * libpcap was configured to include it, and only intended for use by
 365  * libpcap developers trying to debug the optimizer for filter expressions).
 366  */
 367 #ifdef _WIN32
 368 __declspec(dllimport)
 369 #else /* _WIN32 */
 370 extern
 371 #endif /* _WIN32 */
 372 void pcap_set_optimizer_debug(int);
 373 #endif
 374
 375 /* VARARGS */
 376 static void
 377 error(const char *fmt, ...)
 378 {
 379         va_list ap;
 380
 381         (void)fprintf(stderr, "%s: ", program_name);
 382         va_start(ap, fmt);
 383         (void)vfprintf(stderr, fmt, ap);
 384         va_end(ap);
 385         if (*fmt) {
 386                 fmt += strlen(fmt);
 387                 if (fmt[-1] != '\n')
 388                         (void)fputc('\n', stderr);
 389         }
 390         exit_tcpdump(S_ERR_HOST_PROGRAM);
 391         /* NOTREACHED */
 392 }
 393
 394 /* VARARGS */
 395 static void
 396 warning(const char *fmt, ...)
 397 {
 398         va_list ap;
 399
 400         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 401         va_start(ap, fmt);
 402         (void)vfprintf(stderr, fmt, ap);
 403         va_end(ap);
 404         if (*fmt) {
 405                 fmt += strlen(fmt);
 406                 if (fmt[-1] != '\n')
 407                         (void)fputc('\n', stderr);
 408         }
 409 }
 410
 411 static void
 412 exit_tcpdump(int status)
 413 {
 414         nd_cleanup();
 415         exit(status);
 416 }
 417
 418 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 419 static void
 420 show_tstamp_types_and_exit(pcap_t *pc, const char *device)
 421 {
 422         int n_tstamp_types;
 423         int *tstamp_types = 0;
 424         const char *tstamp_type_name;
 425         int i;
 426
 427         n_tstamp_types = pcap_list_tstamp_types(pc, &tstamp_types);
 428         if (n_tstamp_types < 0)
 429                 error("%s", pcap_geterr(pc));
 430
 431         if (n_tstamp_types == 0) {
 432                 fprintf(stderr, "Time stamp type cannot be set for %s\n",
 433                     device);
 434                 exit_tcpdump(S_SUCCESS);
 435         }
 436         fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
 437             device);
 438         for (i = 0; i < n_tstamp_types; i++) {
 439                 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
 440                 if (tstamp_type_name != NULL) {
 441                         (void) fprintf(stderr, "  %s (%s)\n", tstamp_type_name,
 442                             pcap_tstamp_type_val_to_description(tstamp_types[i]));
 443                 } else {
 444                         (void) fprintf(stderr, "  %d\n", tstamp_types[i]);
 445                 }
 446         }
 447         pcap_free_tstamp_types(tstamp_types);
 448         exit_tcpdump(S_SUCCESS);
 449 }
 450 #endif
 451
 452 static void
 453 show_dlts_and_exit(pcap_t *pc, const char *device)
 454 {
 455         int n_dlts, i;
 456         int *dlts = 0;
 457         const char *dlt_name;
 458
 459         n_dlts = pcap_list_datalinks(pc, &dlts);
 460         if (n_dlts < 0)
 461                 error("%s", pcap_geterr(pc));
 462         else if (n_dlts == 0 || !dlts)
 463                 error("No data link types.");
 464
 465         /*
 466          * If the interface is known to support monitor mode, indicate
 467          * whether these are the data link types available when not in
 468          * monitor mode, if -I wasn't specified, or when in monitor mode,
 469          * when -I was specified (the link-layer types available in
 470          * monitor mode might be different from the ones available when
 471          * not in monitor mode).
 472          */
 473         if (supports_monitor_mode)
 474                 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
 475                     device,
 476                     Iflag ? "when in monitor mode" : "when not in monitor mode");
 477         else
 478                 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
 479                     device);
 480
 481         for (i = 0; i < n_dlts; i++) {
 482                 dlt_name = pcap_datalink_val_to_name(dlts[i]);
 483                 if (dlt_name != NULL) {
 484                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
 485                             pcap_datalink_val_to_description(dlts[i]));
 486
 487                         /*
 488                          * OK, does tcpdump handle that type?
 489                          */
 490                         if (!has_printer(dlts[i]))
 491                                 (void) fprintf(stderr, " (printing not supported)");
 492                         fprintf(stderr, "\n");
 493                 } else {
 494                         (void) fprintf(stderr, "  DLT %d (printing not supported)\n",
 495                             dlts[i]);
 496                 }
 497         }
 498 #ifdef HAVE_PCAP_FREE_DATALINKS
 499         pcap_free_datalinks(dlts);
 500 #endif
 501         exit_tcpdump(S_SUCCESS);
 502 }
 503
 504 #ifdef HAVE_PCAP_FINDALLDEVS
 505 static void
 506 show_devices_and_exit(void)
 507 {
 508         pcap_if_t *dev, *devlist;
 509         char ebuf[PCAP_ERRBUF_SIZE];
 510         int i;
 511
 512         if (pcap_findalldevs(&devlist, ebuf) < 0)
 513                 error("%s", ebuf);
 514         for (i = 0, dev = devlist; dev != NULL; i++, dev = dev->next) {
 515                 printf("%d.%s", i+1, dev->name);
 516                 if (dev->description != NULL)
 517                         printf(" (%s)", dev->description);
 518                 if (dev->flags != 0) {
 519                         printf(" [");
 520                         printf("%s", bittok2str(status_flags, "none", dev->flags));
 521 #ifdef PCAP_IF_WIRELESS
 522                         if (dev->flags & PCAP_IF_WIRELESS) {
 523                                 switch (dev->flags & PCAP_IF_CONNECTION_STATUS) {
 524
 525                                 case PCAP_IF_CONNECTION_STATUS_UNKNOWN:
 526                                         printf(", Association status unknown");
 527                                         break;
 528
 529                                 case PCAP_IF_CONNECTION_STATUS_CONNECTED:
 530                                         printf(", Associated");
 531                                         break;
 532
 533                                 case PCAP_IF_CONNECTION_STATUS_DISCONNECTED:
 534                                         printf(", Not associated");
 535                                         break;
 536
 537                                 case PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE:
 538                                         break;
 539                                 }
 540                         } else {
 541                                 switch (dev->flags & PCAP_IF_CONNECTION_STATUS) {
 542
 543                                 case PCAP_IF_CONNECTION_STATUS_UNKNOWN:
 544                                         printf(", Connection status unknown");
 545                                         break;
 546
 547                                 case PCAP_IF_CONNECTION_STATUS_CONNECTED:
 548                                         printf(", Connected");
 549                                         break;
 550
 551                                 case PCAP_IF_CONNECTION_STATUS_DISCONNECTED:
 552                                         printf(", Disconnected");
 553                                         break;
 554
 555                                 case PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE:
 556                                         break;
 557                                 }
 558                         }
 559 #endif
 560                         printf("]");
 561                 }
 562                 printf("\n");
 563         }
 564         pcap_freealldevs(devlist);
 565         exit_tcpdump(S_SUCCESS);
 566 }
 567 #endif /* HAVE_PCAP_FINDALLDEVS */
 568
 569 #ifdef HAVE_PCAP_FINDALLDEVS_EX
 570 static void
 571 show_remote_devices_and_exit(void)
 572 {
 573         pcap_if_t *dev, *devlist;
 574         char ebuf[PCAP_ERRBUF_SIZE];
 575         int i;
 576
 577         if (pcap_findalldevs_ex(remote_interfaces_source, NULL, &devlist,
 578             ebuf) < 0)
 579                 error("%s", ebuf);
 580         for (i = 0, dev = devlist; dev != NULL; i++, dev = dev->next) {
 581                 printf("%d.%s", i+1, dev->name);
 582                 if (dev->description != NULL)
 583                         printf(" (%s)", dev->description);
 584                 if (dev->flags != 0)
 585                         printf(" [%s]", bittok2str(status_flags, "none", dev->flags));
 586                 printf("\n");
 587         }
 588         pcap_freealldevs(devlist);
 589         exit_tcpdump(S_SUCCESS);
 590 }
 591 #endif /* HAVE_PCAP_FINDALLDEVS */
 592
 593 /*
 594  * Short options.
 595  *
 596  * Note that there we use all letters for short options except for g, k,
 597  * o, and P, and those are used by other versions of tcpdump, and we should
 598  * only use them for the same purposes that the other versions of tcpdump
 599  * use them:
 600  *
 601  * macOS tcpdump uses -g to force non--v output for IP to be on one
 602  * line, making it more "g"repable;
 603  *
 604  * macOS tcpdump uses -k to specify that packet comments in pcapng files
 605  * should be printed;
 606  *
 607  * OpenBSD tcpdump uses -o to indicate that OS fingerprinting should be done
 608  * for hosts sending TCP SYN packets;
 609  *
 610  * macOS tcpdump uses -P to indicate that -w should write pcapng rather
 611  * than pcap files.
 612  *
 613  * macOS tcpdump also uses -Q to specify expressions that match packet
 614  * metadata, including but not limited to the packet direction.
 615  * The expression syntax is different from a simple "in|out|inout",
 616  * and those expressions aren't accepted by macOS tcpdump, but the
 617  * equivalents would be "in" = "dir=in", "out" = "dir=out", and
 618  * "inout" = "dir=in or dir=out", and the parser could conceivably
 619  * special-case "in", "out", and "inout" as expressions for backwards
 620  * compatibility, so all is not (yet) lost.
 621  */
 622
 623 /*
 624  * Set up flags that might or might not be supported depending on the
 625  * version of libpcap we're using.
 626  */
 627 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
 628 #define B_FLAG          "B:"
 629 #define B_FLAG_USAGE    " [ -B size ]"
 630 #else /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
 631 #define B_FLAG
 632 #define B_FLAG_USAGE
 633 #endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
 634
 635 #ifdef HAVE_PCAP_FINDALLDEVS
 636 #define D_FLAG  "D"
 637 #else
 638 #define D_FLAG
 639 #endif
 640
 641 #ifdef HAVE_PCAP_CREATE
 642 #define I_FLAG          "I"
 643 #else /* HAVE_PCAP_CREATE */
 644 #define I_FLAG
 645 #endif /* HAVE_PCAP_CREATE */
 646
 647 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 648 #define j_FLAG          "j:"
 649 #define j_FLAG_USAGE    " [ -j tstamptype ]"
 650 #define J_FLAG          "J"
 651 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
 652 #define j_FLAG
 653 #define j_FLAG_USAGE
 654 #define J_FLAG
 655 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
 656
 657 #ifdef USE_LIBSMI
 658 #define m_FLAG_USAGE "[ -m module ] ..."
 659 #endif
 660
 661 #ifdef HAVE_PCAP_SETDIRECTION
 662 #define Q_FLAG "Q:"
 663 #define Q_FLAG_USAGE " [ -Q in|out|inout ]"
 664 #else
 665 #define Q_FLAG
 666 #define Q_FLAG_USAGE
 667 #endif
 668
 669 #ifdef HAVE_PCAP_DUMP_FLUSH
 670 #define U_FLAG  "U"
 671 #else
 672 #define U_FLAG
 673 #endif
 674
 675 #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:#"
 676
 677 /*
 678  * Long options.
 679  *
 680  * We do not currently have long options corresponding to all short
 681  * options; we should probably pick appropriate option names for them.
 682  *
 683  * However, the short options where the number of times the option is
 684  * specified matters, such as -v and -d and -t, should probably not
 685  * just map to a long option, as saying
 686  *
 687  *  tcpdump --verbose --verbose
 688  *
 689  * doesn't make sense; it should be --verbosity={N} or something such
 690  * as that.
 691  *
 692  * For long options with no corresponding short options, we define values
 693  * outside the range of ASCII graphic characters, make that the last
 694  * component of the entry for the long option, and have a case for that
 695  * option in the switch statement.
 696  */
 697 #define OPTION_VERSION                  128
 698 #define OPTION_TSTAMP_PRECISION         129
 699 #define OPTION_IMMEDIATE_MODE           130
 700 #define OPTION_PRINT                    131
 701 #define OPTION_LIST_REMOTE_INTERFACES   132
 702 #define OPTION_TSTAMP_MICRO             133
 703 #define OPTION_TSTAMP_NANO              134
 704 #define OPTION_FP_TYPE                  135
 705 #define OPTION_COUNT                    136
 706
 707 static const struct option longopts[] = {
 708 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
 709         { "buffer-size", required_argument, NULL, 'B' },
 710 #endif
 711         { "list-interfaces", no_argument, NULL, 'D' },
 712 #ifdef HAVE_PCAP_FINDALLDEVS_EX
 713         { "list-remote-interfaces", required_argument, NULL, OPTION_LIST_REMOTE_INTERFACES },
 714 #endif
 715         { "help", no_argument, NULL, 'h' },
 716         { "interface", required_argument, NULL, 'i' },
 717 #ifdef HAVE_PCAP_CREATE
 718         { "monitor-mode", no_argument, NULL, 'I' },
 719 #endif
 720 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
 721         { "time-stamp-type", required_argument, NULL, 'j' },
 722         { "list-time-stamp-types", no_argument, NULL, 'J' },
 723 #endif
 724 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
 725         { "micro", no_argument, NULL, OPTION_TSTAMP_MICRO},
 726         { "nano", no_argument, NULL, OPTION_TSTAMP_NANO},
 727         { "time-stamp-precision", required_argument, NULL, OPTION_TSTAMP_PRECISION},
 728 #endif
 729         { "dont-verify-checksums", no_argument, NULL, 'K' },
 730         { "list-data-link-types", no_argument, NULL, 'L' },
 731         { "no-optimize", no_argument, NULL, 'O' },
 732         { "no-promiscuous-mode", no_argument, NULL, 'p' },
 733 #ifdef HAVE_PCAP_SETDIRECTION
 734         { "direction", required_argument, NULL, 'Q' },
 735 #endif
 736         { "snapshot-length", required_argument, NULL, 's' },
 737         { "absolute-tcp-sequence-numbers", no_argument, NULL, 'S' },
 738 #ifdef HAVE_PCAP_DUMP_FLUSH
 739         { "packet-buffered", no_argument, NULL, 'U' },
 740 #endif
 741         { "linktype", required_argument, NULL, 'y' },
 742 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
 743         { "immediate-mode", no_argument, NULL, OPTION_IMMEDIATE_MODE },
 744 #endif
 745 #ifdef HAVE_PCAP_SET_PARSER_DEBUG
 746         { "debug-filter-parser", no_argument, NULL, 'Y' },
 747 #endif
 748         { "relinquish-privileges", required_argument, NULL, 'Z' },
 749         { "count", no_argument, NULL, OPTION_COUNT },
 750         { "fp-type", no_argument, NULL, OPTION_FP_TYPE },
 751         { "number", no_argument, NULL, '#' },
 752         { "print", no_argument, NULL, OPTION_PRINT },
 753         { "version", no_argument, NULL, OPTION_VERSION },
 754         { NULL, 0, NULL, 0 }
 755 };
 756
 757 #ifdef HAVE_PCAP_FINDALLDEVS_EX
 758 #define LIST_REMOTE_INTERFACES_USAGE "[ --list-remote-interfaces remote-source ]"
 759 #else
 760 #define LIST_REMOTE_INTERFACES_USAGE
 761 #endif
 762
 763 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
 764 #define IMMEDIATE_MODE_USAGE " [ --immediate-mode ]"
 765 #else
 766 #define IMMEDIATE_MODE_USAGE ""
 767 #endif
 768
 769 #ifndef _WIN32
 770 /* Drop root privileges and chroot if necessary */
 771 static void
 772 droproot(const char *username, const char *chroot_dir)
 773 {
 774         struct passwd *pw = NULL;
 775
 776         if (chroot_dir && !username)
 777                 error("Chroot without dropping root is insecure");
 778
 779         pw = getpwnam(username);
 780         if (pw) {
 781                 if (chroot_dir) {
 782                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0)
 783                                 error("Couldn't chroot/chdir to '%.64s': %s",
 784                                       chroot_dir, pcap_strerror(errno));
 785                 }
 786 #ifdef HAVE_LIBCAP_NG
 787                 {
 788                         int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
 789                         if (ret < 0)
 790                                 error("capng_change_id(): return %d\n", ret);
 791                         else
 792                                 fprintf(stderr, "dropped privs to %s\n", username);
 793                 }
 794 #else
 795                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
 796                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0)
 797                         error("Couldn't change to '%.32s' uid=%lu gid=%lu: %s",
 798                                 username,
 799                                 (unsigned long)pw->pw_uid,
 800                                 (unsigned long)pw->pw_gid,
 801                                 pcap_strerror(errno));
 802                 else {
 803                         fprintf(stderr, "dropped privs to %s\n", username);
 804                 }
 805 #endif /* HAVE_LIBCAP_NG */
 806         } else
 807                 error("Couldn't find user '%.32s'", username);
 808 #ifdef HAVE_LIBCAP_NG
 809         /* We don't need CAP_SETUID, CAP_SETGID and CAP_SYS_CHROOT any more. */
 810 DIAG_OFF_CLANG(assign-enum)
 811         capng_updatev(
 812                 CAPNG_DROP,
 813                 CAPNG_EFFECTIVE | CAPNG_PERMITTED,
 814                 CAP_SETUID,
 815                 CAP_SETGID,
 816                 CAP_SYS_CHROOT,
 817                 -1);
 818 DIAG_ON_CLANG(assign-enum)
 819         capng_apply(CAPNG_SELECT_BOTH);
 820 #endif /* HAVE_LIBCAP_NG */
 821
 822 }
 823 #endif /* _WIN32 */
 824
 825 static int
 826 getWflagChars(int x)
 827 {
 828         int c = 0;
 829
 830         x -= 1;
 831         while (x > 0) {
 832                 c += 1;
 833                 x /= 10;
 834         }
 835
 836         return c;
 837 }
 838
 839
 840 static void
 841 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
 842 {
 843         char *filename = malloc(PATH_MAX + 1);
 844         if (filename == NULL)
 845             error("%s: malloc", __func__);
 846
 847         /* Process with strftime if Gflag is set. */
 848         if (Gflag != 0) {
 849           struct tm *local_tm;
 850
 851           /* Convert Gflag_time to a usable format */
 852           if ((local_tm = localtime(&Gflag_time)) == NULL) {
 853                   error("%s: localtime", __func__);
 854           }
 855
 856           /* There's no good way to detect an error in strftime since a return
 857            * value of 0 isn't necessarily failure.
 858            */
 859           strftime(filename, PATH_MAX, orig_name, local_tm);
 860         } else {
 861           strncpy(filename, orig_name, PATH_MAX);
 862         }
 863
 864         if (cnt == 0 && max_chars == 0)
 865                 strncpy(buffer, filename, PATH_MAX + 1);
 866         else
 867                 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
 868                   /* Report an error if the filename is too large */
 869                   error("too many output files or filename is too long (> %d)", PATH_MAX);
 870         free(filename);
 871 }
 872
 873 static char *
 874 get_next_file(FILE *VFile, char *ptr)
 875 {
 876         char *ret;
 877         size_t len;
 878
 879         ret = fgets(ptr, PATH_MAX, VFile);
 880         if (!ret)
 881                 return NULL;
 882
 883         len = strlen (ptr);
 884         if (len > 0 && ptr[len - 1] == '\n')
 885                 ptr[len - 1] = '\0';
 886
 887         return ret;
 888 }
 889
 890 #ifdef HAVE_CASPER
 891 static cap_channel_t *
 892 capdns_setup(void)
 893 {
 894         cap_channel_t *capcas, *capdnsloc;
 895         const char *types[1];
 896         int families[2];
 897
 898         capcas = cap_init();
 899         if (capcas == NULL)
 900                 error("unable to create casper process");
 901         capdnsloc = cap_service_open(capcas, "system.dns");
 902         /* Casper capability no longer needed. */
 903         cap_close(capcas);
 904         if (capdnsloc == NULL)
 905                 error("unable to open system.dns service");
 906         /* Limit system.dns to reverse DNS lookups. */
 907         types[0] = "ADDR";
 908         if (cap_dns_type_limit(capdnsloc, types, 1) < 0)
 909                 error("unable to limit access to system.dns service");
 910         families[0] = AF_INET;
 911         families[1] = AF_INET6;
 912         if (cap_dns_family_limit(capdnsloc, families, 2) < 0)
 913                 error("unable to limit access to system.dns service");
 914
 915         return (capdnsloc);
 916 }
 917 #endif  /* HAVE_CASPER */
 918
 919 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
 920 static int
 921 tstamp_precision_from_string(const char *precision)
 922 {
 923         if (strncmp(precision, "nano", strlen("nano")) == 0)
 924                 return PCAP_TSTAMP_PRECISION_NANO;
 925
 926         if (strncmp(precision, "micro", strlen("micro")) == 0)
 927                 return PCAP_TSTAMP_PRECISION_MICRO;
 928
 929         return -EINVAL;
 930 }
 931
 932 static const char *
 933 tstamp_precision_to_string(int precision)
 934 {
 935         switch (precision) {
 936
 937         case PCAP_TSTAMP_PRECISION_MICRO:
 938                 return "micro";
 939
 940         case PCAP_TSTAMP_PRECISION_NANO:
 941                 return "nano";
 942
 943         default:
 944                 return "unknown";
 945         }
 946 }
 947 #endif
 948
 949 #ifdef HAVE_CAPSICUM
 950 /*
 951  * Ensure that, on a dump file's descriptor, we have all the rights
 952  * necessary to make the standard I/O library work with an fdopen()ed
 953  * FILE * from that descriptor.
 954  *
 955  * A long time ago in a galaxy far, far away, AT&T decided that, instead
 956  * of providing separate APIs for getting and setting the FD_ flags on a
 957  * descriptor, getting and setting the O_ flags on a descriptor, and
 958  * locking files, they'd throw them all into a kitchen-sink fcntl() call
 959  * along the lines of ioctl(), the fact that ioctl() operations are
 960  * largely specific to particular character devices but fcntl() operations
 961  * are either generic to all descriptors or generic to all descriptors for
 962  * regular files nonwithstanding.
 963  *
 964  * The Capsicum people decided that fine-grained control of descriptor
 965  * operations was required, so that you need to grant permission for
 966  * reading, writing, seeking, and fcntl-ing.  The latter, courtesy of
 967  * AT&T's decision, means that "fcntl-ing" isn't a thing, but a motley
 968  * collection of things, so there are *individual* fcntls for which
 969  * permission needs to be granted.
 970  *
 971  * The FreeBSD standard I/O people implemented some optimizations that
 972  * requires that the standard I/O routines be able to determine whether
 973  * the descriptor for the FILE * is open append-only or not; as that
 974  * descriptor could have come from an open() rather than an fopen(),
 975  * that requires that it be able to do an F_GETFL fcntl() to read
 976  * the O_ flags.
 977  *
 978  * Tcpdump uses ftell() to determine how much data has been written
 979  * to a file in order to, when used with -C, determine when it's time
 980  * to rotate capture files.  ftell() therefore needs to do an lseek()
 981  * to find out the file offset and must, thanks to the aforementioned
 982  * optimization, also know whether the descriptor is open append-only
 983  * or not.
 984  *
 985  * The net result of all the above is that we need to grant CAP_SEEK,
 986  * CAP_WRITE, and CAP_FCNTL with the CAP_FCNTL_GETFL subcapability.
 987  *
 988  * Perhaps this is the universe's way of saying that either
 989  *
 990  *      1) there needs to be an fopenat() call and a pcap_dump_openat() call
 991  *         using it, so that Capsicum-capable tcpdump wouldn't need to do
 992  *         an fdopen()
 993  *
 994  * or
 995  *
 996  *      2) there needs to be a cap_fdopen() call in the FreeBSD standard
 997  *         I/O library that knows what rights are needed by the standard
 998  *         I/O library, based on the open mode, and assigns them, perhaps
 999  *         with an additional argument indicating, for example, whether
1000  *         seeking should be allowed, so that tcpdump doesn't need to know
1001  *         what the standard I/O library happens to require this week.
1002  */
1003 static void
1004 set_dumper_capsicum_rights(pcap_dumper_t *p)
1005 {
1006         int fd = fileno(pcap_dump_file(p));
1007         cap_rights_t rights;
1008
1009         cap_rights_init(&rights, CAP_SEEK, CAP_WRITE, CAP_FCNTL);
1010         if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
1011                 error("unable to limit dump descriptor");
1012         }
1013         if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) {
1014                 error("unable to limit dump descriptor fcntls");
1015         }
1016 }
1017 #endif
1018
1019 /*
1020  * Copy arg vector into a new buffer, concatenating arguments with spaces.
1021  */
1022 static char *
1023 copy_argv(char **argv)
1024 {
1025         char **p;
1026         size_t len = 0;
1027         char *buf;
1028         char *src, *dst;
1029
1030         p = argv;
1031         if (*p == NULL)
1032                 return 0;
1033
1034         while (*p)
1035                 len += strlen(*p++) + 1;
1036
1037         buf = (char *)malloc(len);
1038         if (buf == NULL)
1039                 error("%s: malloc", __func__);
1040
1041         p = argv;
1042         dst = buf;
1043         while ((src = *p++) != NULL) {
1044                 while ((*dst++ = *src++) != '\0')
1045                         ;
1046                 dst[-1] = ' ';
1047         }
1048         dst[-1] = '\0';
1049
1050         return buf;
1051 }
1052
1053 /*
1054  * On Windows, we need to open the file in binary mode, so that
1055  * we get all the bytes specified by the size we get from "fstat()".
1056  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
1057  * we define it as 0 if it's not defined, so it does nothing.
1058  */
1059 #ifndef O_BINARY
1060 #define O_BINARY        0
1061 #endif
1062
1063 static char *
1064 read_infile(char *fname)
1065 {
1066         int i, fd;
1067         ssize_t cc;
1068         char *cp;
1069         our_statb buf;
1070
1071         fd = open(fname, O_RDONLY|O_BINARY);
1072         if (fd < 0)
1073                 error("can't open %s: %s", fname, pcap_strerror(errno));
1074
1075         if (our_fstat(fd, &buf) < 0)
1076                 error("can't stat %s: %s", fname, pcap_strerror(errno));
1077
1078         /*
1079          * Reject files whose size doesn't fit into an int; a filter
1080          * *that* large will probably be too big.
1081          */
1082         if (buf.st_size > INT_MAX)
1083                 error("%s is too large", fname);
1084
1085         cp = malloc((u_int)buf.st_size + 1);
1086         if (cp == NULL)
1087                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
1088                         fname, pcap_strerror(errno));
1089         cc = read(fd, cp, (u_int)buf.st_size);
1090         if (cc < 0)
1091                 error("read %s: %s", fname, pcap_strerror(errno));
1092         if (cc != buf.st_size)
1093                 error("short read %s (%d != %d)", fname, (int) cc,
1094                     (int)buf.st_size);
1095
1096         close(fd);
1097         /* replace "# comment" with spaces */
1098         for (i = 0; i < cc; i++) {
1099                 if (cp[i] == '#')
1100                         while (i < cc && cp[i] != '\n')
1101                                 cp[i++] = ' ';
1102         }
1103         cp[cc] = '\0';
1104         return (cp);
1105 }
1106
1107 #ifdef HAVE_PCAP_FINDALLDEVS
1108 static long
1109 parse_interface_number(const char *device)
1110 {
1111         const char *p;
1112         long devnum;
1113         char *end;
1114
1115         /*
1116          * Search for a colon, terminating any scheme at the beginning
1117          * of the device.
1118          */
1119         p = strchr(device, ':');
1120         if (p != NULL) {
1121                 /*
1122                  * We found it.  Is it followed by "//"?
1123                  */
1124                 p++;    /* skip the : */
1125                 if (strncmp(p, "//", 2) == 0) {
1126                         /*
1127                          * Yes.  Search for the next /, at the end of the
1128                          * authority part of the URL.
1129                          */
1130                         p += 2; /* skip the // */
1131                         p = strchr(p, '/');
1132                         if (p != NULL) {
1133                                 /*
1134                                  * OK, past the / is the path.
1135                                  */
1136                                 device = p + 1;
1137                         }
1138                 }
1139         }
1140         devnum = strtol(device, &end, 10);
1141         if (device != end && *end == '\0') {
1142                 /*
1143                  * It's all-numeric, but is it a valid number?
1144                  */
1145                 if (devnum <= 0) {
1146                         /*
1147                          * No, it's not an ordinal.
1148                          */
1149                         error("Invalid adapter index");
1150                 }
1151                 return (devnum);
1152         } else {
1153                 /*
1154                  * It's not all-numeric; return -1, so our caller
1155                  * knows that.
1156                  */
1157                 return (-1);
1158         }
1159 }
1160
1161 static char *
1162 find_interface_by_number(const char *url
1163 #ifndef HAVE_PCAP_FINDALLDEVS_EX
1164 _U_
1165 #endif
1166 , long devnum)
1167 {
1168         pcap_if_t *dev, *devlist;
1169         long i;
1170         char ebuf[PCAP_ERRBUF_SIZE];
1171         char *device;
1172 #ifdef HAVE_PCAP_FINDALLDEVS_EX
1173         const char *endp;
1174         char *host_url;
1175 #endif
1176         int status;
1177
1178 #ifdef HAVE_PCAP_FINDALLDEVS_EX
1179         /*
1180          * Search for a colon, terminating any scheme at the beginning
1181          * of the URL.
1182          */
1183         endp = strchr(url, ':');
1184         if (endp != NULL) {
1185                 /*
1186                  * We found it.  Is it followed by "//"?
1187                  */
1188                 endp++; /* skip the : */
1189                 if (strncmp(endp, "//", 2) == 0) {
1190                         /*
1191                          * Yes.  Search for the next /, at the end of the
1192                          * authority part of the URL.
1193                          */
1194                         endp += 2;      /* skip the // */
1195                         endp = strchr(endp, '/');
1196                 } else
1197                         endp = NULL;
1198         }
1199         if (endp != NULL) {
1200                 /*
1201                  * OK, everything from device to endp is a URL to hand
1202                  * to pcap_findalldevs_ex().
1203                  */
1204                 endp++; /* Include the trailing / in the URL; pcap_findalldevs_ex() requires it */
1205                 host_url = malloc(endp - url + 1);
1206                 if (host_url == NULL && (endp - url + 1) > 0)
1207                         error("Invalid allocation for host");
1208
1209                 memcpy(host_url, url, endp - url);
1210                 host_url[endp - url] = '\0';
1211                 status = pcap_findalldevs_ex(host_url, NULL, &devlist, ebuf);
1212                 free(host_url);
1213         } else
1214 #endif
1215         status = pcap_findalldevs(&devlist, ebuf);
1216         if (status < 0)
1217                 error("%s", ebuf);
1218         /*
1219          * Look for the devnum-th entry in the list of devices (1-based).
1220          */
1221         for (i = 0, dev = devlist; i < devnum-1 && dev != NULL;
1222             i++, dev = dev->next)
1223                 ;
1224         if (dev == NULL)
1225                 error("Invalid adapter index");
1226         device = strdup(dev->name);
1227         pcap_freealldevs(devlist);
1228         return (device);
1229 }
1230 #endif
1231
1232 #ifdef HAVE_PCAP_OPEN
1233 /*
1234  * Prefixes for rpcap URLs.
1235  */
1236 static char rpcap_prefix[] = "rpcap://";
1237 static char rpcap_ssl_prefix[] = "rpcaps://";
1238 #endif
1239
1240 static pcap_t *
1241 open_interface(const char *device, netdissect_options *ndo, char *ebuf)
1242 {
1243         pcap_t *pc;
1244 #ifdef HAVE_PCAP_CREATE
1245         int status;
1246         char *cp;
1247 #endif
1248
1249 #ifdef HAVE_PCAP_OPEN
1250         /*
1251          * Is this an rpcap URL?
1252          */
1253         if (strncmp(device, rpcap_prefix, sizeof(rpcap_prefix) - 1) == 0 ||
1254             strncmp(device, rpcap_ssl_prefix, sizeof(rpcap_ssl_prefix) - 1) == 0) {
1255                 /*
1256                  * Yes.  Open it with pcap_open().
1257                  */
1258                 *ebuf = '\0';
1259                 pc = pcap_open(device, ndo->ndo_snaplen,
1260                     pflag ? 0 : PCAP_OPENFLAG_PROMISCUOUS, timeout, NULL,
1261                     ebuf);
1262                 if (pc == NULL) {
1263                         /*
1264                          * If this failed with "No such device" or "The system
1265                          * cannot find the device specified", that means
1266                          * the interface doesn't exist; return NULL, so that
1267                          * the caller can see whether the device name is
1268                          * actually an interface index.
1269                          */
1270                         if (strstr(ebuf, "No such device") != NULL ||
1271                             strstr(ebuf, "The system cannot find the device specified") != NULL)
1272                                 return (NULL);
1273                         error("%s", ebuf);
1274                 }
1275                 if (*ebuf)
1276                         warning("%s", ebuf);
1277                 return (pc);
1278         }
1279 #endif /* HAVE_PCAP_OPEN */
1280
1281 #ifdef HAVE_PCAP_CREATE
1282         pc = pcap_create(device, ebuf);
1283         if (pc == NULL) {
1284                 /*
1285                  * If this failed with "No such device", that means
1286                  * the interface doesn't exist; return NULL, so that
1287                  * the caller can see whether the device name is
1288                  * actually an interface index.
1289                  */
1290                 if (strstr(ebuf, "No such device") != NULL)
1291                         return (NULL);
1292                 error("%s", ebuf);
1293         }
1294 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1295         if (Jflag)
1296                 show_tstamp_types_and_exit(pc, device);
1297 #endif
1298 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1299         status = pcap_set_tstamp_precision(pc, ndo->ndo_tstamp_precision);
1300         if (status != 0)
1301                 error("%s: Can't set %ssecond time stamp precision: %s",
1302                     device,
1303                     tstamp_precision_to_string(ndo->ndo_tstamp_precision),
1304                     pcap_statustostr(status));
1305 #endif
1306
1307 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1308         if (immediate_mode) {
1309                 status = pcap_set_immediate_mode(pc, 1);
1310                 if (status != 0)
1311                         error("%s: Can't set immediate mode: %s",
1312                             device, pcap_statustostr(status));
1313         }
1314 #endif
1315         /*
1316          * Is this an interface that supports monitor mode?
1317          */
1318         if (pcap_can_set_rfmon(pc) == 1)
1319                 supports_monitor_mode = 1;
1320         else
1321                 supports_monitor_mode = 0;
1322         if (ndo->ndo_snaplen != 0) {
1323                 /*
1324                  * A snapshot length was explicitly specified;
1325                  * use it.
1326                  */
1327                 status = pcap_set_snaplen(pc, ndo->ndo_snaplen);
1328                 if (status != 0)
1329                         error("%s: Can't set snapshot length: %s",
1330                             device, pcap_statustostr(status));
1331         }
1332         status = pcap_set_promisc(pc, !pflag);
1333         if (status != 0)
1334                 error("%s: Can't set promiscuous mode: %s",
1335                     device, pcap_statustostr(status));
1336         if (Iflag) {
1337                 status = pcap_set_rfmon(pc, 1);
1338                 if (status != 0)
1339                         error("%s: Can't set monitor mode: %s",
1340                             device, pcap_statustostr(status));
1341         }
1342         status = pcap_set_timeout(pc, timeout);
1343         if (status != 0)
1344                 error("%s: pcap_set_timeout failed: %s",
1345                     device, pcap_statustostr(status));
1346         if (Bflag != 0) {
1347                 status = pcap_set_buffer_size(pc, Bflag);
1348                 if (status != 0)
1349                         error("%s: Can't set buffer size: %s",
1350                             device, pcap_statustostr(status));
1351         }
1352 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1353         if (jflag != -1) {
1354                 status = pcap_set_tstamp_type(pc, jflag);
1355                 if (status < 0)
1356                         error("%s: Can't set time stamp type: %s",
1357                             device, pcap_statustostr(status));
1358                 else if (status > 0)
1359                         warning("When trying to set timestamp type '%s' on %s: %s",
1360                             pcap_tstamp_type_val_to_name(jflag), device,
1361                             pcap_statustostr(status));
1362         }
1363 #endif
1364         status = pcap_activate(pc);
1365         if (status < 0) {
1366                 /*
1367                  * pcap_activate() failed.
1368                  */
1369                 cp = pcap_geterr(pc);
1370                 if (status == PCAP_ERROR)
1371                         error("%s", cp);
1372                 else if (status == PCAP_ERROR_NO_SUCH_DEVICE) {
1373                         /*
1374                          * Return an error for our caller to handle.
1375                          */
1376                         snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s\n(%s)",
1377                             device, pcap_statustostr(status), cp);
1378                 } else if (status == PCAP_ERROR_PERM_DENIED && *cp != '\0')
1379                         error("%s: %s\n(%s)", device,
1380                             pcap_statustostr(status), cp);
1381 #ifdef __FreeBSD__
1382                 else if (status == PCAP_ERROR_RFMON_NOTSUP &&
1383                     strncmp(device, "wlan", 4) == 0) {
1384                         char parent[8], newdev[8];
1385                         char sysctl[32];
1386                         size_t s = sizeof(parent);
1387
1388                         snprintf(sysctl, sizeof(sysctl),
1389                             "net.wlan.%d.%%parent", atoi(device + 4));
1390                         sysctlbyname(sysctl, parent, &s, NULL, 0);
1391                         strlcpy(newdev, device, sizeof(newdev));
1392                         /* Suggest a new wlan device. */
1393                         /* FIXME: incrementing the index this way is not going to work well
1394                          * when the index is 9 or greater but the only consequence in this
1395                          * specific case would be an error message that looks a bit odd.
1396                          */
1397                         newdev[strlen(newdev)-1]++;
1398                         error("%s is not a monitor mode VAP\n"
1399                             "To create a new monitor mode VAP use:\n"
1400                             "  ifconfig %s create wlandev %s wlanmode monitor\n"
1401                             "and use %s as the tcpdump interface",
1402                             device, newdev, parent, newdev);
1403                 }
1404 #endif
1405                 else
1406                         error("%s: %s", device,
1407                             pcap_statustostr(status));
1408                 pcap_close(pc);
1409                 return (NULL);
1410         } else if (status > 0) {
1411                 /*
1412                  * pcap_activate() succeeded, but it's warning us
1413                  * of a problem it had.
1414                  */
1415                 cp = pcap_geterr(pc);
1416                 if (status == PCAP_WARNING)
1417                         warning("%s", cp);
1418                 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1419                          *cp != '\0')
1420                         warning("%s: %s\n(%s)", device,
1421                             pcap_statustostr(status), cp);
1422                 else
1423                         warning("%s: %s", device,
1424                             pcap_statustostr(status));
1425         }
1426 #ifdef HAVE_PCAP_SETDIRECTION
1427         if (Qflag != -1) {
1428                 status = pcap_setdirection(pc, Qflag);
1429                 if (status != 0)
1430                         error("%s: pcap_setdirection() failed: %s",
1431                               device,  pcap_geterr(pc));
1432                 }
1433 #endif /* HAVE_PCAP_SETDIRECTION */
1434 #else /* HAVE_PCAP_CREATE */
1435         *ebuf = '\0';
1436         /*
1437          * If no snapshot length was specified, or a length of 0 was
1438          * specified, default to 256KB.
1439          */
1440         if (ndo->ndo_snaplen == 0)
1441                 ndo->ndo_snaplen = MAXIMUM_SNAPLEN;
1442         pc = pcap_open_live(device, ndo->ndo_snaplen, !pflag, timeout, ebuf);
1443         if (pc == NULL) {
1444                 /*
1445                  * If this failed with "No such device", that means
1446                  * the interface doesn't exist; return NULL, so that
1447                  * the caller can see whether the device name is
1448                  * actually an interface index.
1449                  */
1450                 if (strstr(ebuf, "No such device") != NULL)
1451                         return (NULL);
1452                 error("%s", ebuf);
1453         }
1454         if (*ebuf)
1455                 warning("%s", ebuf);
1456 #endif /* HAVE_PCAP_CREATE */
1457
1458         return (pc);
1459 }
1460
1461 int
1462 main(int argc, char **argv)
1463 {
1464         int cnt, op, i;
1465         bpf_u_int32 localnet = 0, netmask = 0;
1466         char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
1467         char *endp;
1468         pcap_handler callback;
1469         int dlt;
1470         const char *dlt_name;
1471         struct bpf_program fcode;
1472 #ifndef _WIN32
1473         void (*oldhandler)(int);
1474 #endif
1475         struct dump_info dumpinfo;
1476         u_char *pcap_userdata;
1477         char ebuf[PCAP_ERRBUF_SIZE];
1478         char VFileLine[PATH_MAX + 1];
1479         const char *username = NULL;
1480 #ifndef _WIN32
1481         const char *chroot_dir = NULL;
1482 #endif
1483         char *ret = NULL;
1484         char *end;
1485 #ifdef HAVE_PCAP_FINDALLDEVS
1486         pcap_if_t *devlist;
1487         long devnum;
1488 #endif
1489         int status;
1490         FILE *VFile;
1491 #ifdef HAVE_CAPSICUM
1492         cap_rights_t rights;
1493         int cansandbox;
1494 #endif  /* HAVE_CAPSICUM */
1495         int Oflag = 1;                  /* run filter code optimizer */
1496         int yflag_dlt = -1;
1497         const char *yflag_dlt_name = NULL;
1498         int print = 0;
1499
1500         netdissect_options Ndo;
1501         netdissect_options *ndo = &Ndo;
1502
1503         /*
1504          * Initialize the netdissect code.
1505          */
1506         if (nd_init(ebuf, sizeof(ebuf)) == -1)
1507                 error("%s", ebuf);
1508
1509         memset(ndo, 0, sizeof(*ndo));
1510         ndo_set_function_pointers(ndo);
1511
1512         cnt = -1;
1513         device = NULL;
1514         infile = NULL;
1515         RFileName = NULL;
1516         VFileName = NULL;
1517         VFile = NULL;
1518         WFileName = NULL;
1519         dlt = -1;
1520         if ((cp = strrchr(argv[0], PATH_SEPARATOR)) != NULL)
1521                 ndo->program_name = program_name = cp + 1;
1522         else
1523                 ndo->program_name = program_name = argv[0];
1524
1525 #if defined(HAVE_PCAP_WSOCKINIT)
1526         if (pcap_wsockinit() != 0)
1527                 error("Attempting to initialize Winsock failed");
1528 #elif defined(HAVE_WSOCKINIT)
1529         if (wsockinit() != 0)
1530                 error("Attempting to initialize Winsock failed");
1531 #endif
1532
1533         /*
1534          * On platforms where the CPU doesn't support unaligned loads,
1535          * force unaligned accesses to abort with SIGBUS, rather than
1536          * being fixed up (slowly) by the OS kernel; on those platforms,
1537          * misaligned accesses are bugs, and we want tcpdump to crash so
1538          * that the bugs are reported.
1539          */
1540         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
1541                 error("%s", ebuf);
1542
1543         while (
1544             (op = getopt_long(argc, argv, SHORTOPTS, longopts, NULL)) != -1)
1545                 switch (op) {
1546
1547                 case 'a':
1548                         /* compatibility for old -a */
1549                         break;
1550
1551                 case 'A':
1552                         ++ndo->ndo_Aflag;
1553                         break;
1554
1555                 case 'b':
1556                         ++ndo->ndo_bflag;
1557                         break;
1558
1559 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
1560                 case 'B':
1561                         Bflag = atoi(optarg)*1024;
1562                         if (Bflag <= 0)
1563                                 error("invalid packet buffer size %s", optarg);
1564                         break;
1565 #endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
1566
1567                 case 'c':
1568                         cnt = atoi(optarg);
1569                         if (cnt <= 0)
1570                                 error("invalid packet count %s", optarg);
1571                         break;
1572
1573                 case 'C':
1574                         errno = 0;
1575 #ifdef HAVE_PCAP_DUMP_FTELL64
1576                         Cflag = strtoint64_t(optarg, &endp, 10);
1577 #else
1578                         Cflag = strtol(optarg, &endp, 10);
1579 #endif
1580                         if (endp == optarg || *endp != '\0' || errno != 0
1581                             || Cflag <= 0)
1582                                 error("invalid file size %s", optarg);
1583                         /*
1584                          * Will multiplying it by 1000000 overflow?
1585                          */
1586 #ifdef HAVE_PCAP_DUMP_FTELL64
1587                         if (Cflag > INT64_T_CONSTANT(0x7fffffffffffffff) / 1000000)
1588 #else
1589                         if (Cflag > LONG_MAX / 1000000)
1590 #endif
1591                                 error("file size %s is too large", optarg);
1592                         Cflag *= 1000000;
1593                         break;
1594
1595                 case 'd':
1596                         ++dflag;
1597                         break;
1598
1599 #ifdef HAVE_PCAP_FINDALLDEVS
1600                 case 'D':
1601                         Dflag++;
1602                         break;
1603 #endif
1604
1605 #ifdef HAVE_PCAP_FINDALLDEVS_EX
1606                 case OPTION_LIST_REMOTE_INTERFACES:
1607                         remote_interfaces_source = optarg;
1608                         break;
1609 #endif
1610
1611                 case 'L':
1612                         Lflag++;
1613                         break;
1614
1615                 case 'e':
1616                         ++ndo->ndo_eflag;
1617                         break;
1618
1619                 case 'E':
1620 #ifndef HAVE_LIBCRYPTO
1621                         warning("crypto code not compiled in");
1622 #endif
1623                         ndo->ndo_espsecret = optarg;
1624                         break;
1625
1626                 case 'f':
1627                         ++ndo->ndo_fflag;
1628                         break;
1629
1630                 case 'F':
1631                         infile = optarg;
1632                         break;
1633
1634                 case 'G':
1635                         Gflag = atoi(optarg);
1636                         if (Gflag < 0)
1637                                 error("invalid number of seconds %s", optarg);
1638
1639                         /* We will create one file initially. */
1640                         Gflag_count = 0;
1641
1642                         /* Grab the current time for rotation use. */
1643                         if ((Gflag_time = time(NULL)) == (time_t)-1) {
1644                                 error("%s: can't get current time: %s",
1645                                     __func__, pcap_strerror(errno));
1646                         }
1647                         break;
1648
1649                 case 'h':
1650                         print_usage(stdout);
1651                         exit_tcpdump(S_SUCCESS);
1652                         break;
1653
1654                 case 'H':
1655                         ++ndo->ndo_Hflag;
1656                         break;
1657
1658                 case 'i':
1659                         device = optarg;
1660                         break;
1661
1662 #ifdef HAVE_PCAP_CREATE
1663                 case 'I':
1664                         ++Iflag;
1665                         break;
1666 #endif /* HAVE_PCAP_CREATE */
1667
1668 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1669                 case 'j':
1670                         jflag = pcap_tstamp_type_name_to_val(optarg);
1671                         if (jflag < 0)
1672                                 error("invalid time stamp type %s", optarg);
1673                         break;
1674
1675                 case 'J':
1676                         Jflag++;
1677                         break;
1678 #endif
1679
1680                 case 'l':
1681 #ifdef _WIN32
1682                         /*
1683                          * _IOLBF is the same as _IOFBF in Microsoft's C
1684                          * libraries; the only alternative they offer
1685                          * is _IONBF.
1686                          *
1687                          * XXX - this should really be checking for MSVC++,
1688                          * not _WIN32, if, for example, MinGW has its own
1689                          * C library that is more UNIX-compatible.
1690                          */
1691                         setvbuf(stdout, NULL, _IONBF, 0);
1692 #else /* _WIN32 */
1693 #ifdef HAVE_SETLINEBUF
1694                         setlinebuf(stdout);
1695 #else
1696                         setvbuf(stdout, NULL, _IOLBF, 0);
1697 #endif
1698 #endif /* _WIN32 */
1699                         lflag = 1;
1700                         break;
1701
1702                 case 'K':
1703                         ++ndo->ndo_Kflag;
1704                         break;
1705
1706                 case 'm':
1707                         if (nd_have_smi_support()) {
1708                                 if (nd_load_smi_module(optarg, ebuf, sizeof(ebuf)) == -1)
1709                                         error("%s", ebuf);
1710                         } else {
1711                                 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
1712                                               program_name, optarg);
1713                                 (void)fprintf(stderr, "(no libsmi support)\n");
1714                         }
1715                         break;
1716
1717                 case 'M':
1718                         /* TCP-MD5 shared secret */
1719 #ifndef HAVE_LIBCRYPTO
1720                         warning("crypto code not compiled in");
1721 #endif
1722                         ndo->ndo_sigsecret = optarg;
1723                         break;
1724
1725                 case 'n':
1726                         ++ndo->ndo_nflag;
1727                         break;
1728
1729                 case 'N':
1730                         ++ndo->ndo_Nflag;
1731                         break;
1732
1733                 case 'O':
1734                         Oflag = 0;
1735                         break;
1736
1737                 case 'p':
1738                         ++pflag;
1739                         break;
1740
1741                 case 'q':
1742                         ++ndo->ndo_qflag;
1743                         ++ndo->ndo_suppress_default_print;
1744                         break;
1745
1746 #ifdef HAVE_PCAP_SETDIRECTION
1747                 case 'Q':
1748                         if (ascii_strcasecmp(optarg, "in") == 0)
1749                                 Qflag = PCAP_D_IN;
1750                         else if (ascii_strcasecmp(optarg, "out") == 0)
1751                                 Qflag = PCAP_D_OUT;
1752                         else if (ascii_strcasecmp(optarg, "inout") == 0)
1753                                 Qflag = PCAP_D_INOUT;
1754                         else
1755                                 error("unknown capture direction `%s'", optarg);
1756                         break;
1757 #endif /* HAVE_PCAP_SETDIRECTION */
1758
1759                 case 'r':
1760                         RFileName = optarg;
1761                         break;
1762
1763                 case 's':
1764                         ndo->ndo_snaplen = (int)strtol(optarg, &end, 0);
1765                         if (optarg == end || *end != '\0'
1766                             || ndo->ndo_snaplen < 0 || ndo->ndo_snaplen > MAXIMUM_SNAPLEN)
1767                                 error("invalid snaplen %s (must be >= 0 and <= %d)",
1768                                       optarg, MAXIMUM_SNAPLEN);
1769                         break;
1770
1771                 case 'S':
1772                         ++ndo->ndo_Sflag;
1773                         break;
1774
1775                 case 't':
1776                         ++ndo->ndo_tflag;
1777                         break;
1778
1779                 case 'T':
1780                         if (ascii_strcasecmp(optarg, "vat") == 0)
1781                                 ndo->ndo_packettype = PT_VAT;
1782                         else if (ascii_strcasecmp(optarg, "wb") == 0)
1783                                 ndo->ndo_packettype = PT_WB;
1784                         else if (ascii_strcasecmp(optarg, "rpc") == 0)
1785                                 ndo->ndo_packettype = PT_RPC;
1786                         else if (ascii_strcasecmp(optarg, "rtp") == 0)
1787                                 ndo->ndo_packettype = PT_RTP;
1788                         else if (ascii_strcasecmp(optarg, "rtcp") == 0)
1789                                 ndo->ndo_packettype = PT_RTCP;
1790                         else if (ascii_strcasecmp(optarg, "snmp") == 0)
1791                                 ndo->ndo_packettype = PT_SNMP;
1792                         else if (ascii_strcasecmp(optarg, "cnfp") == 0)
1793                                 ndo->ndo_packettype = PT_CNFP;
1794                         else if (ascii_strcasecmp(optarg, "tftp") == 0)
1795                                 ndo->ndo_packettype = PT_TFTP;
1796                         else if (ascii_strcasecmp(optarg, "aodv") == 0)
1797                                 ndo->ndo_packettype = PT_AODV;
1798                         else if (ascii_strcasecmp(optarg, "carp") == 0)
1799                                 ndo->ndo_packettype = PT_CARP;
1800                         else if (ascii_strcasecmp(optarg, "radius") == 0)
1801                                 ndo->ndo_packettype = PT_RADIUS;
1802                         else if (ascii_strcasecmp(optarg, "zmtp1") == 0)
1803                                 ndo->ndo_packettype = PT_ZMTP1;
1804                         else if (ascii_strcasecmp(optarg, "vxlan") == 0)
1805                                 ndo->ndo_packettype = PT_VXLAN;
1806                         else if (ascii_strcasecmp(optarg, "pgm") == 0)
1807                                 ndo->ndo_packettype = PT_PGM;
1808                         else if (ascii_strcasecmp(optarg, "pgm_zmtp1") == 0)
1809                                 ndo->ndo_packettype = PT_PGM_ZMTP1;
1810                         else if (ascii_strcasecmp(optarg, "lmp") == 0)
1811                                 ndo->ndo_packettype = PT_LMP;
1812                         else if (ascii_strcasecmp(optarg, "resp") == 0)
1813                                 ndo->ndo_packettype = PT_RESP;
1814                         else if (ascii_strcasecmp(optarg, "ptp") == 0)
1815                                 ndo->ndo_packettype = PT_PTP;
1816                         else if (ascii_strcasecmp(optarg, "someip") == 0)
1817                                 ndo->ndo_packettype = PT_SOMEIP;
1818                         else if (ascii_strcasecmp(optarg, "domain") == 0)
1819                                 ndo->ndo_packettype = PT_DOMAIN;
1820                         else
1821                                 error("unknown packet type `%s'", optarg);
1822                         break;
1823
1824                 case 'u':
1825                         ++ndo->ndo_uflag;
1826                         break;
1827
1828 #ifdef HAVE_PCAP_DUMP_FLUSH
1829                 case 'U':
1830                         ++Uflag;
1831                         break;
1832 #endif
1833
1834                 case 'v':
1835                         ++ndo->ndo_vflag;
1836                         break;
1837
1838                 case 'V':
1839                         VFileName = optarg;
1840                         break;
1841
1842                 case 'w':
1843                         WFileName = optarg;
1844                         break;
1845
1846                 case 'W':
1847                         Wflag = atoi(optarg);
1848                         if (Wflag <= 0)
1849                                 error("invalid number of output files %s", optarg);
1850                         WflagChars = getWflagChars(Wflag);
1851                         break;
1852
1853                 case 'x':
1854                         ++ndo->ndo_xflag;
1855                         ++ndo->ndo_suppress_default_print;
1856                         break;
1857
1858                 case 'X':
1859                         ++ndo->ndo_Xflag;
1860                         ++ndo->ndo_suppress_default_print;
1861                         break;
1862
1863                 case 'y':
1864                         yflag_dlt_name = optarg;
1865                         yflag_dlt =
1866                                 pcap_datalink_name_to_val(yflag_dlt_name);
1867                         if (yflag_dlt < 0)
1868                                 error("invalid data link type %s", yflag_dlt_name);
1869                         break;
1870
1871 #ifdef HAVE_PCAP_SET_PARSER_DEBUG
1872                 case 'Y':
1873                         {
1874                         /* Undocumented flag */
1875                         pcap_set_parser_debug(1);
1876                         }
1877                         break;
1878 #endif
1879                 case 'z':
1880                         zflag = optarg;
1881                         break;
1882
1883                 case 'Z':
1884                         username = optarg;
1885                         break;
1886
1887                 case '#':
1888                         ndo->ndo_packet_number = 1;
1889                         break;
1890
1891                 case OPTION_VERSION:
1892                         print_version(stdout);
1893                         exit_tcpdump(S_SUCCESS);
1894                         break;
1895
1896 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1897                 case OPTION_TSTAMP_PRECISION:
1898                         ndo->ndo_tstamp_precision = tstamp_precision_from_string(optarg);
1899                         if (ndo->ndo_tstamp_precision < 0)
1900                                 error("unsupported time stamp precision");
1901                         break;
1902 #endif
1903
1904 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1905                 case OPTION_IMMEDIATE_MODE:
1906                         immediate_mode = 1;
1907                         break;
1908 #endif
1909
1910                 case OPTION_PRINT:
1911                         print = 1;
1912                         break;
1913
1914 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1915                 case OPTION_TSTAMP_MICRO:
1916                         ndo->ndo_tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
1917                         break;
1918
1919                 case OPTION_TSTAMP_NANO:
1920                         ndo->ndo_tstamp_precision = PCAP_TSTAMP_PRECISION_NANO;
1921                         break;
1922 #endif
1923
1924                 case OPTION_FP_TYPE:
1925                         /*
1926                          * Print out the type of floating-point arithmetic
1927                          * we're doing; it's probably IEEE, unless somebody
1928                          * tries to run this on a VAX, but the precision
1929                          * may differ (e.g., it might be 32-bit, 64-bit,
1930                          * or 80-bit).
1931                          */
1932                         float_type_check(0x4e93312d);
1933                         return 0;
1934
1935                 case OPTION_COUNT:
1936                         count_mode = 1;
1937                         break;
1938
1939                 default:
1940                         print_usage(stderr);
1941                         exit_tcpdump(S_ERR_HOST_PROGRAM);
1942                         /* NOTREACHED */
1943                 }
1944
1945 #ifdef HAVE_PCAP_FINDALLDEVS
1946         if (Dflag)
1947                 show_devices_and_exit();
1948 #endif
1949 #ifdef HAVE_PCAP_FINDALLDEVS_EX
1950         if (remote_interfaces_source != NULL)
1951                 show_remote_devices_and_exit();
1952 #endif
1953
1954 #if defined(DLT_LINUX_SLL2) && defined(HAVE_PCAP_SET_DATALINK)
1955 /* Set default linktype DLT_LINUX_SLL2 when capturing on the "any" device */
1956                 if (device != NULL &&
1957                     strncmp (device, "any", strlen("any")) == 0
1958                     && yflag_dlt == -1)
1959                         yflag_dlt = DLT_LINUX_SLL2;
1960 #endif
1961
1962         switch (ndo->ndo_tflag) {
1963
1964         case 0: /* Default */
1965         case 1: /* No time stamp */
1966         case 2: /* Unix timeval style */
1967         case 3: /* Microseconds/nanoseconds since previous packet */
1968         case 4: /* Date + Default */
1969         case 5: /* Microseconds/nanoseconds since first packet */
1970                 break;
1971
1972         default: /* Not supported */
1973                 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1974                 break;
1975         }
1976
1977         if (ndo->ndo_fflag != 0 && (VFileName != NULL || RFileName != NULL))
1978                 error("-f can not be used with -V or -r");
1979
1980         if (VFileName != NULL && RFileName != NULL)
1981                 error("-V and -r are mutually exclusive.");
1982
1983         /*
1984          * If we're printing dissected packets to the standard output,
1985          * and either the standard output is a terminal or we're doing
1986          * "line" buffering, set the capture timeout to .1 second rather
1987          * than 1 second, as the user's probably expecting to see packets
1988          * pop up immediately shortly after they arrive.
1989          *
1990          * XXX - would there be some value appropriate for all cases,
1991          * based on, say, the buffer size and packet input rate?
1992          */
1993         if ((WFileName == NULL || print) && (isatty(1) || lflag))
1994                 timeout = 100;
1995
1996 #ifdef WITH_CHROOT
1997         /* if run as root, prepare for chrooting */
1998         if (getuid() == 0 || geteuid() == 0) {
1999                 /* future extensibility for cmd-line arguments */
2000                 if (!chroot_dir)
2001                         chroot_dir = WITH_CHROOT;
2002         }
2003 #endif
2004
2005 #ifdef WITH_USER
2006         /* if run as root, prepare for dropping root privileges */
2007         if (getuid() == 0 || geteuid() == 0) {
2008                 /* Run with '-Z root' to restore old behaviour */
2009                 if (!username)
2010                         username = WITH_USER;
2011         }
2012 #endif
2013
2014         if (RFileName != NULL || VFileName != NULL) {
2015                 /*
2016                  * If RFileName is non-null, it's the pathname of a
2017                  * savefile to read.  If VFileName is non-null, it's
2018                  * the pathname of a file containing a list of pathnames
2019                  * (one per line) of savefiles to read.
2020                  *
2021                  * In either case, we're reading a savefile, not doing
2022                  * a live capture.
2023                  */
2024 #ifndef _WIN32
2025                 /*
2026                  * We don't need network access, so relinquish any set-UID
2027                  * or set-GID privileges we have (if any).
2028                  *
2029                  * We do *not* want set-UID privileges when opening a
2030                  * trace file, as that might let the user read other
2031                  * people's trace files (especially if we're set-UID
2032                  * root).
2033                  */
2034                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
2035                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
2036 #endif /* _WIN32 */
2037                 if (VFileName != NULL) {
2038                         if (VFileName[0] == '-' && VFileName[1] == '\0')
2039                                 VFile = stdin;
2040                         else
2041                                 VFile = fopen(VFileName, "r");
2042
2043                         if (VFile == NULL)
2044                                 error("Unable to open file: %s\n", pcap_strerror(errno));
2045
2046                         ret = get_next_file(VFile, VFileLine);
2047                         if (!ret)
2048                                 error("Nothing in %s\n", VFileName);
2049                         RFileName = VFileLine;
2050                 }
2051
2052 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
2053                 pd = pcap_open_offline_with_tstamp_precision(RFileName,
2054                     ndo->ndo_tstamp_precision, ebuf);
2055 #else
2056                 pd = pcap_open_offline(RFileName, ebuf);
2057 #endif
2058
2059                 if (pd == NULL)
2060                         error("%s", ebuf);
2061 #ifdef HAVE_CAPSICUM
2062                 cap_rights_init(&rights, CAP_READ);
2063                 if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 &&
2064                     errno != ENOSYS) {
2065                         error("unable to limit pcap descriptor");
2066                 }
2067 #endif
2068                 dlt = pcap_datalink(pd);
2069                 dlt_name = pcap_datalink_val_to_name(dlt);
2070                 fprintf(stderr, "reading from file %s", RFileName);
2071                 if (dlt_name == NULL) {
2072                         fprintf(stderr, ", link-type %u", dlt);
2073                 } else {
2074                         fprintf(stderr, ", link-type %s (%s)", dlt_name,
2075                                 pcap_datalink_val_to_description(dlt));
2076                 }
2077                 fprintf(stderr, ", snapshot length %d\n", pcap_snapshot(pd));
2078 #ifdef DLT_LINUX_SLL2
2079                 if (dlt == DLT_LINUX_SLL2)
2080                         fprintf(stderr, "Warning: interface names might be incorrect\n");
2081 #endif
2082         } else if (dflag && !device) {
2083                 int dump_dlt = DLT_EN10MB;
2084                 /*
2085                  * We're dumping the compiled code without an explicit
2086                  * device specification.  (If a device is specified, we
2087                  * definitely want to open it to use the DLT of that device.)
2088                  * Either default to DLT_EN10MB with a warning, or use
2089                  * the user-specified value if supplied.
2090                  */
2091                 /*
2092                  * If no snapshot length was specified, or a length of 0 was
2093                  * specified, default to 256KB.
2094                  */
2095                 if (ndo->ndo_snaplen == 0)
2096                         ndo->ndo_snaplen = MAXIMUM_SNAPLEN;
2097                 /*
2098                  * If a DLT was specified with the -y flag, use that instead.
2099                  */
2100                 if (yflag_dlt != -1)
2101                         dump_dlt = yflag_dlt;
2102                 else
2103                         fprintf(stderr, "Warning: assuming Ethernet\n");
2104                 pd = pcap_open_dead(dump_dlt, ndo->ndo_snaplen);
2105         } else {
2106                 /*
2107                  * We're doing a live capture.
2108                  */
2109                 if (device == NULL) {
2110                         /*
2111                          * No interface was specified.  Pick one.
2112                          */
2113 #ifdef HAVE_PCAP_FINDALLDEVS
2114                         /*
2115                          * Find the list of interfaces, and pick
2116                          * the first interface.
2117                          */
2118                         if (pcap_findalldevs(&devlist, ebuf) == -1)
2119                                 error("%s", ebuf);
2120                         if (devlist == NULL)
2121                                 error("no interfaces available for capture");
2122                         device = strdup(devlist->name);
2123                         pcap_freealldevs(devlist);
2124 #else /* HAVE_PCAP_FINDALLDEVS */
2125                         /*
2126                          * Use whatever interface pcap_lookupdev()
2127                          * chooses.
2128                          */
2129                         device = pcap_lookupdev(ebuf);
2130                         if (device == NULL)
2131                                 error("%s", ebuf);
2132 #endif
2133                 }
2134
2135                 /*
2136                  * Try to open the interface with the specified name.
2137                  */
2138                 pd = open_interface(device, ndo, ebuf);
2139                 if (pd == NULL) {
2140                         /*
2141                          * That failed.  If we can get a list of
2142                          * interfaces, and the interface name
2143                          * is purely numeric, try to use it as
2144                          * a 1-based index in the list of
2145                          * interfaces.
2146                          */
2147 #ifdef HAVE_PCAP_FINDALLDEVS
2148                         devnum = parse_interface_number(device);
2149                         if (devnum == -1) {
2150                                 /*
2151                                  * It's not a number; just report
2152                                  * the open error and fail.
2153                                  */
2154                                 error("%s", ebuf);
2155                         }
2156
2157                         /*
2158                          * OK, it's a number; try to find the
2159                          * interface with that index, and try
2160                          * to open it.
2161                          *
2162                          * find_interface_by_number() exits if it
2163                          * couldn't be found.
2164                          */
2165                         device = find_interface_by_number(device, devnum);
2166                         pd = open_interface(device, ndo, ebuf);
2167                         if (pd == NULL)
2168                                 error("%s", ebuf);
2169 #else /* HAVE_PCAP_FINDALLDEVS */
2170                         /*
2171                          * We can't get a list of interfaces; just
2172                          * fail.
2173                          */
2174                         error("%s", ebuf);
2175 #endif /* HAVE_PCAP_FINDALLDEVS */
2176                 }
2177
2178                 /*
2179                  * Let user own process after capture device has
2180                  * been opened.
2181                  */
2182 #ifndef _WIN32
2183                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
2184                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
2185 #endif /* _WIN32 */
2186 #if !defined(HAVE_PCAP_CREATE) && defined(_WIN32)
2187                 if(Bflag != 0)
2188                         if(pcap_setbuff(pd, Bflag)==-1){
2189                                 error("%s", pcap_geterr(pd));
2190                         }
2191 #endif /* !defined(HAVE_PCAP_CREATE) && defined(_WIN32) */
2192                 if (Lflag)
2193                         show_dlts_and_exit(pd, device);
2194                 if (yflag_dlt >= 0) {
2195 #ifdef HAVE_PCAP_SET_DATALINK
2196                         if (pcap_set_datalink(pd, yflag_dlt) < 0)
2197                                 error("%s", pcap_geterr(pd));
2198 #else
2199                         /*
2200                          * We don't actually support changing the
2201                          * data link type, so we only let them
2202                          * set it to what it already is.
2203                          */
2204                         if (yflag_dlt != pcap_datalink(pd)) {
2205                                 error("%s is not one of the DLTs supported by this device\n",
2206                                       yflag_dlt_name);
2207                         }
2208 #endif
2209                         (void)fprintf(stderr, "%s: data link type %s\n",
2210                                       program_name,
2211                                       pcap_datalink_val_to_name(yflag_dlt));
2212                         (void)fflush(stderr);
2213                 }
2214                 i = pcap_snapshot(pd);
2215                 if (ndo->ndo_snaplen < i) {
2216                         if (ndo->ndo_snaplen != 0)
2217                                 warning("snaplen raised from %d to %d", ndo->ndo_snaplen, i);
2218                         ndo->ndo_snaplen = i;
2219                 } else if (ndo->ndo_snaplen > i) {
2220                         warning("snaplen lowered from %d to %d", ndo->ndo_snaplen, i);
2221                         ndo->ndo_snaplen = i;
2222                 }
2223                 if(ndo->ndo_fflag != 0) {
2224                         if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
2225                                 warning("foreign (-f) flag used but: %s", ebuf);
2226                         }
2227                 }
2228
2229         }
2230         if (infile)
2231                 cmdbuf = read_infile(infile);
2232         else
2233                 cmdbuf = copy_argv(&argv[optind]);
2234
2235 #ifdef HAVE_PCAP_SET_OPTIMIZER_DEBUG
2236         pcap_set_optimizer_debug(dflag);
2237 #endif
2238         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
2239                 error("%s", pcap_geterr(pd));
2240         if (dflag) {
2241                 bpf_dump(&fcode, dflag);
2242                 pcap_close(pd);
2243                 free(cmdbuf);
2244                 pcap_freecode(&fcode);
2245                 exit_tcpdump(S_SUCCESS);
2246         }
2247
2248 #ifdef HAVE_CASPER
2249         if (!ndo->ndo_nflag)
2250                 capdns = capdns_setup();
2251 #endif  /* HAVE_CASPER */
2252
2253         init_print(ndo, localnet, netmask);
2254
2255 #ifndef _WIN32
2256         (void)setsignal(SIGPIPE, cleanup);
2257         (void)setsignal(SIGTERM, cleanup);
2258 #endif /* _WIN32 */
2259         (void)setsignal(SIGINT, cleanup);
2260 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2261         (void)setsignal(SIGCHLD, child_cleanup);
2262 #endif
2263         /* Cooperate with nohup(1) */
2264 #ifndef _WIN32
2265         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
2266                 (void)setsignal(SIGHUP, oldhandler);
2267 #endif /* _WIN32 */
2268
2269 #ifndef _WIN32
2270         /*
2271          * If a user name was specified with "-Z", attempt to switch to
2272          * that user's UID.  This would probably be used with sudo,
2273          * to allow tcpdump to be run in a special restricted
2274          * account (if you just want to allow users to open capture
2275          * devices, and can't just give users that permission,
2276          * you'd make tcpdump set-UID or set-GID).
2277          *
2278          * Tcpdump doesn't necessarily write only to one savefile;
2279          * the general only way to allow a -Z instance to write to
2280          * savefiles as the user under whose UID it's run, rather
2281          * than as the user specified with -Z, would thus be to switch
2282          * to the original user ID before opening a capture file and
2283          * then switch back to the -Z user ID after opening the savefile.
2284          * Switching to the -Z user ID only after opening the first
2285          * savefile doesn't handle the general case.
2286          */
2287
2288         if (getuid() == 0 || geteuid() == 0) {
2289 #ifdef HAVE_LIBCAP_NG
2290                 /* Initialize capng */
2291                 capng_clear(CAPNG_SELECT_BOTH);
2292                 if (username) {
2293 DIAG_OFF_CLANG(assign-enum)
2294                         capng_updatev(
2295                                 CAPNG_ADD,
2296                                 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
2297                                 CAP_SETUID,
2298                                 CAP_SETGID,
2299                                 -1);
2300 DIAG_ON_CLANG(assign-enum)
2301                 }
2302                 if (chroot_dir) {
2303 DIAG_OFF_CLANG(assign-enum)
2304                         capng_update(
2305                                 CAPNG_ADD,
2306                                 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
2307                                 CAP_SYS_CHROOT
2308                                 );
2309 DIAG_ON_CLANG(assign-enum)
2310                 }
2311
2312                 if (WFileName) {
2313 DIAG_OFF_CLANG(assign-enum)
2314                         capng_update(
2315                                 CAPNG_ADD,
2316                                 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
2317                                 CAP_DAC_OVERRIDE
2318                                 );
2319 DIAG_ON_CLANG(assign-enum)
2320                 }
2321                 capng_apply(CAPNG_SELECT_BOTH);
2322 #endif /* HAVE_LIBCAP_NG */
2323                 if (username || chroot_dir)
2324                         droproot(username, chroot_dir);
2325
2326         }
2327 #endif /* _WIN32 */
2328
2329         if (pcap_setfilter(pd, &fcode) < 0)
2330                 error("%s", pcap_geterr(pd));
2331 #ifdef HAVE_CAPSICUM
2332         if (RFileName == NULL && VFileName == NULL && pcap_fileno(pd) != -1) {
2333                 static const unsigned long cmds[] = { BIOCGSTATS, BIOCROTZBUF };
2334
2335                 /*
2336                  * The various libpcap devices use a combination of
2337                  * read (bpf), ioctl (bpf, netmap), poll (netmap)
2338                  * so we add the relevant access rights.
2339                  */
2340                 cap_rights_init(&rights, CAP_IOCTL, CAP_READ, CAP_EVENT);
2341                 if (cap_rights_limit(pcap_fileno(pd), &rights) < 0 &&
2342                     errno != ENOSYS) {
2343                         error("unable to limit pcap descriptor");
2344                 }
2345                 if (cap_ioctls_limit(pcap_fileno(pd), cmds,
2346                     sizeof(cmds) / sizeof(cmds[0])) < 0 && errno != ENOSYS) {
2347                         error("unable to limit ioctls on pcap descriptor");
2348                 }
2349         }
2350 #endif
2351         if (WFileName) {
2352                 /* Do not exceed the default PATH_MAX for files. */
2353                 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
2354
2355                 if (dumpinfo.CurrentFileName == NULL)
2356                         error("malloc of dumpinfo.CurrentFileName");
2357
2358                 /* We do not need numbering for dumpfiles if Cflag isn't set. */
2359                 if (Cflag != 0)
2360                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
2361                 else
2362                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
2363
2364                 pdd = pcap_dump_open(pd, dumpinfo.CurrentFileName);
2365 #ifdef HAVE_LIBCAP_NG
2366                 /* Give up CAP_DAC_OVERRIDE capability.
2367                  * Only allow it to be restored if the -C or -G flag have been
2368                  * set since we may need to create more files later on.
2369                  */
2370                 capng_update(
2371                         CAPNG_DROP,
2372                         (Cflag || Gflag ? 0 : CAPNG_PERMITTED)
2373                                 | CAPNG_EFFECTIVE,
2374                         CAP_DAC_OVERRIDE
2375                         );
2376                 capng_apply(CAPNG_SELECT_BOTH);
2377 #endif /* HAVE_LIBCAP_NG */
2378                 if (pdd == NULL)
2379                         error("%s", pcap_geterr(pd));
2380 #ifdef HAVE_CAPSICUM
2381                 set_dumper_capsicum_rights(pdd);
2382 #endif
2383                 if (Cflag != 0 || Gflag != 0) {
2384 #ifdef HAVE_CAPSICUM
2385                         dumpinfo.WFileName = strdup(basename(WFileName));
2386                         if (dumpinfo.WFileName == NULL) {
2387                                 error("Unable to allocate memory for file %s",
2388                                     WFileName);
2389                         }
2390                         dumpinfo.dirfd = open(dirname(WFileName),
2391                             O_DIRECTORY | O_RDONLY);
2392                         if (dumpinfo.dirfd < 0) {
2393                                 error("unable to open directory %s",
2394                                     dirname(WFileName));
2395                         }
2396                         cap_rights_init(&rights, CAP_CREATE, CAP_FCNTL,
2397                             CAP_FTRUNCATE, CAP_LOOKUP, CAP_SEEK, CAP_WRITE);
2398                         if (cap_rights_limit(dumpinfo.dirfd, &rights) < 0 &&
2399                             errno != ENOSYS) {
2400                                 error("unable to limit directory rights");
2401                         }
2402                         if (cap_fcntls_limit(dumpinfo.dirfd, CAP_FCNTL_GETFL) < 0 &&
2403                             errno != ENOSYS) {
2404                                 error("unable to limit dump descriptor fcntls");
2405                         }
2406 #else   /* !HAVE_CAPSICUM */
2407                         dumpinfo.WFileName = WFileName;
2408 #endif
2409                         callback = dump_packet_and_trunc;
2410                         dumpinfo.pd = pd;
2411                         dumpinfo.pdd = pdd;
2412                         pcap_userdata = (u_char *)&dumpinfo;
2413                 } else {
2414                         callback = dump_packet;
2415                         dumpinfo.WFileName = WFileName;
2416                         dumpinfo.pd = pd;
2417                         dumpinfo.pdd = pdd;
2418                         pcap_userdata = (u_char *)&dumpinfo;
2419                 }
2420                 if (print) {
2421                         dlt = pcap_datalink(pd);
2422                         ndo->ndo_if_printer = get_if_printer(dlt);
2423                         dumpinfo.ndo = ndo;
2424                 } else
2425                         dumpinfo.ndo = NULL;
2426
2427 #ifdef HAVE_PCAP_DUMP_FLUSH
2428                 if (Uflag)
2429                         pcap_dump_flush(pdd);
2430 #endif
2431         } else {
2432                 dlt = pcap_datalink(pd);
2433                 ndo->ndo_if_printer = get_if_printer(dlt);
2434                 callback = print_packet;
2435                 pcap_userdata = (u_char *)ndo;
2436         }
2437
2438 #ifdef SIGNAL_REQ_INFO
2439         /*
2440          * We can't get statistics when reading from a file rather
2441          * than capturing from a device.
2442          */
2443         if (RFileName == NULL)
2444                 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
2445 #endif
2446 #ifdef SIGNAL_FLUSH_PCAP
2447         (void)setsignal(SIGNAL_FLUSH_PCAP, flushpcap);
2448 #endif
2449
2450         if (ndo->ndo_vflag > 0 && WFileName && RFileName == NULL && !print) {
2451                 /*
2452                  * When capturing to a file, if "--print" wasn't specified,
2453                  *"-v" means tcpdump should, once per second,
2454                  * "v"erbosely report the number of packets captured.
2455                  * Except when reading from a file, because -r, -w and -v
2456                  * together used to make a corner case, in which pcap_loop()
2457                  * errored due to EINTR (see GH #155 for details).
2458                  */
2459 #ifdef _WIN32
2460                 /*
2461                  * https://blogs.msdn.microsoft.com/oldnewthing/20151230-00/?p=92741
2462                  *
2463                  * suggests that this dates back to W2K.
2464                  *
2465                  * I don't know what a "long wait" is, but we'll assume
2466                  * that printing the stats could be a "long wait".
2467                  */
2468                 CreateTimerQueueTimer(&timer_handle, NULL,
2469                     verbose_stats_dump, NULL, 1000, 1000,
2470                     WT_EXECUTEDEFAULT|WT_EXECUTELONGFUNCTION);
2471                 setvbuf(stderr, NULL, _IONBF, 0);
2472 #else /* _WIN32 */
2473                 /*
2474                  * Assume this is UN*X, and that it has setitimer(); that
2475                  * dates back to UNIX 95.
2476                  */
2477                 struct itimerval timer;
2478                 (void)setsignal(SIGALRM, verbose_stats_dump);
2479                 timer.it_interval.tv_sec = 1;
2480                 timer.it_interval.tv_usec = 0;
2481                 timer.it_value.tv_sec = 1;
2482                 timer.it_value.tv_usec = 1;
2483                 setitimer(ITIMER_REAL, &timer, NULL);
2484 #endif /* _WIN32 */
2485         }
2486
2487         if (RFileName == NULL) {
2488                 /*
2489                  * Live capture (if -V was specified, we set RFileName
2490                  * to a file from the -V file).  Print a message to
2491                  * the standard error on UN*X.
2492                  */
2493                 if (!ndo->ndo_vflag && !WFileName) {
2494                         (void)fprintf(stderr,
2495                             "%s: verbose output suppressed, use -v[v]... for full protocol decode\n",
2496                             program_name);
2497                 } else
2498                         (void)fprintf(stderr, "%s: ", program_name);
2499                 dlt = pcap_datalink(pd);
2500                 dlt_name = pcap_datalink_val_to_name(dlt);
2501                 (void)fprintf(stderr, "listening on %s", device);
2502                 if (dlt_name == NULL) {
2503                         (void)fprintf(stderr, ", link-type %u", dlt);
2504                 } else {
2505                         (void)fprintf(stderr, ", link-type %s (%s)", dlt_name,
2506                                       pcap_datalink_val_to_description(dlt));
2507                 }
2508                 (void)fprintf(stderr, ", snapshot length %d bytes\n", ndo->ndo_snaplen);
2509                 (void)fflush(stderr);
2510         }
2511
2512 #ifdef HAVE_CAPSICUM
2513         cansandbox = (VFileName == NULL && zflag == NULL);
2514 #ifdef HAVE_CASPER
2515         cansandbox = (cansandbox && (ndo->ndo_nflag || capdns != NULL));
2516 #else
2517         cansandbox = (cansandbox && ndo->ndo_nflag);
2518 #endif /* HAVE_CASPER */
2519         if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
2520                 error("unable to enter the capability mode");
2521 #endif  /* HAVE_CAPSICUM */
2522
2523         do {
2524                 status = pcap_loop(pd, cnt, callback, pcap_userdata);
2525                 if (WFileName == NULL) {
2526                         /*
2527                          * We're printing packets.  Flush the printed output,
2528                          * so it doesn't get intermingled with error output.
2529                          */
2530                         if (status == -2) {
2531                                 /*
2532                                  * We got interrupted, so perhaps we didn't
2533                                  * manage to finish a line we were printing.
2534                                  * Print an extra newline, just in case.
2535                                  */
2536                                 putchar('\n');
2537                         }
2538                         (void)fflush(stdout);
2539                 }
2540                 if (status == -2) {
2541                         /*
2542                          * We got interrupted. If we are reading multiple
2543                          * files (via -V) set these so that we stop.
2544                          */
2545                         VFileName = NULL;
2546                         ret = NULL;
2547                 }
2548                 if (status == -1) {
2549                         /*
2550                          * Error.  Report it.
2551                          */
2552                         (void)fprintf(stderr, "%s: pcap_loop: %s\n",
2553                             program_name, pcap_geterr(pd));
2554                 }
2555                 if (RFileName == NULL) {
2556                         /*
2557                          * We're doing a live capture.  Report the capture
2558                          * statistics.
2559                          */
2560                         info(1);
2561                 }
2562                 pcap_close(pd);
2563                 if (VFileName != NULL) {
2564                         ret = get_next_file(VFile, VFileLine);
2565                         if (ret) {
2566                                 int new_dlt;
2567
2568                                 RFileName = VFileLine;
2569                                 pd = pcap_open_offline(RFileName, ebuf);
2570                                 if (pd == NULL)
2571                                         error("%s", ebuf);
2572 #ifdef HAVE_CAPSICUM
2573                                 cap_rights_init(&rights, CAP_READ);
2574                                 if (cap_rights_limit(fileno(pcap_file(pd)),
2575                                     &rights) < 0 && errno != ENOSYS) {
2576                                         error("unable to limit pcap descriptor");
2577                                 }
2578 #endif
2579                                 new_dlt = pcap_datalink(pd);
2580                                 if (new_dlt != dlt) {
2581                                         /*
2582                                          * The new file has a different
2583                                          * link-layer header type from the
2584                                          * previous one.
2585                                          */
2586                                         if (WFileName != NULL) {
2587                                                 /*
2588                                                  * We're writing raw packets
2589                                                  * that match the filter to
2590                                                  * a pcap file.  pcap files
2591                                                  * don't support multiple
2592                                                  * different link-layer
2593                                                  * header types, so we fail
2594                                                  * here.
2595                                                  */
2596                                                 error("%s: new dlt does not match original", RFileName);
2597                                         }
2598
2599                                         /*
2600                                          * We're printing the decoded packets;
2601                                          * switch to the new DLT.
2602                                          *
2603                                          * To do that, we need to change
2604                                          * the printer, change the DLT name,
2605                                          * and recompile the filter with
2606                                          * the new DLT.
2607                                          */
2608                                         dlt = new_dlt;
2609                                         ndo->ndo_if_printer = get_if_printer(dlt);
2610                                         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
2611                                                 error("%s", pcap_geterr(pd));
2612                                 }
2613
2614                                 /*
2615                                  * Set the filter on the new file.
2616                                  */
2617                                 if (pcap_setfilter(pd, &fcode) < 0)
2618                                         error("%s", pcap_geterr(pd));
2619
2620                                 /*
2621                                  * Report the new file.
2622                                  */
2623                                 dlt_name = pcap_datalink_val_to_name(dlt);
2624                                 fprintf(stderr, "reading from file %s", RFileName);
2625                                 if (dlt_name == NULL) {
2626                                         fprintf(stderr, ", link-type %u", dlt);
2627                                 } else {
2628                                         fprintf(stderr, ", link-type %s (%s)",
2629                                                 dlt_name,
2630                                                 pcap_datalink_val_to_description(dlt));
2631                                 }
2632                                 fprintf(stderr, ", snapshot length %d\n", pcap_snapshot(pd));
2633                         }
2634                 }
2635         }
2636         while (ret != NULL);
2637
2638         if (count_mode && RFileName != NULL)
2639                 fprintf(stdout, "%u packet%s\n", packets_captured,
2640                         PLURAL_SUFFIX(packets_captured));
2641
2642         free(cmdbuf);
2643         pcap_freecode(&fcode);
2644         exit_tcpdump(status == -1 ? 1 : 0);
2645 }
2646
2647 /*
2648  * Catch a signal.
2649  */
2650 static void
2651 (*setsignal (int sig, void (*func)(int)))(int)
2652 {
2653 #ifdef _WIN32
2654         return (signal(sig, func));
2655 #else
2656         struct sigaction old, new;
2657
2658         memset(&new, 0, sizeof(new));
2659         new.sa_handler = func;
2660         if (sig == SIGCHLD)
2661                 new.sa_flags = SA_RESTART;
2662         if (sigaction(sig, &new, &old) < 0)
2663                 return (SIG_ERR);
2664         return (old.sa_handler);
2665 #endif
2666 }
2667
2668 /* make a clean exit on interrupts */
2669 static void
2670 cleanup(int signo _U_)
2671 {
2672 #ifdef _WIN32
2673         if (timer_handle != INVALID_HANDLE_VALUE) {
2674                 DeleteTimerQueueTimer(NULL, timer_handle, NULL);
2675                 CloseHandle(timer_handle);
2676                 timer_handle = INVALID_HANDLE_VALUE;
2677         }
2678 #else /* _WIN32 */
2679         struct itimerval timer;
2680
2681         timer.it_interval.tv_sec = 0;
2682         timer.it_interval.tv_usec = 0;
2683         timer.it_value.tv_sec = 0;
2684         timer.it_value.tv_usec = 0;
2685         setitimer(ITIMER_REAL, &timer, NULL);
2686 #endif /* _WIN32 */
2687
2688 #ifdef HAVE_PCAP_BREAKLOOP
2689         /*
2690          * We have "pcap_breakloop()"; use it, so that we do as little
2691          * as possible in the signal handler (it's probably not safe
2692          * to do anything with standard I/O streams in a signal handler -
2693          * the ANSI C standard doesn't say it is).
2694          */
2695         pcap_breakloop(pd);
2696 #else
2697         /*
2698          * We don't have "pcap_breakloop()"; this isn't safe, but
2699          * it's the best we can do.  Print the summary if we're
2700          * not reading from a savefile - i.e., if we're doing a
2701          * live capture - and exit.
2702          */
2703         if (pd != NULL && pcap_file(pd) == NULL) {
2704                 /*
2705                  * We got interrupted, so perhaps we didn't
2706                  * manage to finish a line we were printing.
2707                  * Print an extra newline, just in case.
2708                  */
2709                 putchar('\n');
2710                 (void)fflush(stdout);
2711                 info(1);
2712         }
2713         exit_tcpdump(S_SUCCESS);
2714 #endif
2715 }
2716
2717 /*
2718   On windows, we do not use a fork, so we do not care less about
2719   waiting a child processes to die
2720  */
2721 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2722 static void
2723 child_cleanup(int signo _U_)
2724 {
2725   wait(NULL);
2726 }
2727 #endif /* HAVE_FORK && HAVE_VFORK */
2728
2729 static void
2730 info(int verbose)
2731 {
2732         struct pcap_stat stats;
2733
2734         /*
2735          * Older versions of libpcap didn't set ps_ifdrop on some
2736          * platforms; initialize it to 0 to handle that.
2737          */
2738         stats.ps_ifdrop = 0;
2739         if (pcap_stats(pd, &stats) < 0) {
2740                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
2741                 infoprint = 0;
2742                 return;
2743         }
2744
2745         if (!verbose)
2746                 fprintf(stderr, "%s: ", program_name);
2747
2748         (void)fprintf(stderr, "%u packet%s captured", packets_captured,
2749             PLURAL_SUFFIX(packets_captured));
2750         if (!verbose)
2751                 fputs(", ", stderr);
2752         else
2753                 putc('\n', stderr);
2754         (void)fprintf(stderr, "%u packet%s received by filter", stats.ps_recv,
2755             PLURAL_SUFFIX(stats.ps_recv));
2756         if (!verbose)
2757                 fputs(", ", stderr);
2758         else
2759                 putc('\n', stderr);
2760         (void)fprintf(stderr, "%u packet%s dropped by kernel", stats.ps_drop,
2761             PLURAL_SUFFIX(stats.ps_drop));
2762         if (stats.ps_ifdrop != 0) {
2763                 if (!verbose)
2764                         fputs(", ", stderr);
2765                 else
2766                         putc('\n', stderr);
2767                 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
2768                     stats.ps_ifdrop, PLURAL_SUFFIX(stats.ps_ifdrop));
2769         } else
2770                 putc('\n', stderr);
2771         infoprint = 0;
2772 }
2773
2774 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2775 #ifdef HAVE_FORK
2776 #define fork_subprocess() fork()
2777 #else
2778 #define fork_subprocess() vfork()
2779 #endif
2780 static void
2781 compress_savefile(const char *filename)
2782 {
2783         pid_t child;
2784
2785         child = fork_subprocess();
2786         if (child == -1) {
2787                 fprintf(stderr,
2788                         "compress_savefile: fork failed: %s\n",
2789                         pcap_strerror(errno));
2790                 return;
2791         }
2792         if (child != 0) {
2793                 /* Parent process. */
2794                 return;
2795         }
2796
2797         /*
2798          * Child process.
2799          * Set to lowest priority so that this doesn't disturb the capture.
2800          */
2801 #ifdef NZERO
2802         setpriority(PRIO_PROCESS, 0, NZERO - 1);
2803 #else
2804         setpriority(PRIO_PROCESS, 0, 19);
2805 #endif
2806         if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
2807                 fprintf(stderr,
2808                         "compress_savefile: execlp(%s, %s) failed: %s\n",
2809                         zflag,
2810                         filename,
2811                         pcap_strerror(errno));
2812 #ifdef HAVE_FORK
2813         exit(S_ERR_HOST_PROGRAM);
2814 #else
2815         _exit(S_ERR_HOST_PROGRAM);
2816 #endif
2817 }
2818 #else  /* HAVE_FORK && HAVE_VFORK */
2819 static void
2820 compress_savefile(const char *filename)
2821 {
2822         fprintf(stderr,
2823                 "compress_savefile failed. Functionality not implemented under your system\n");
2824 }
2825 #endif /* HAVE_FORK && HAVE_VFORK */
2826
2827 static void
2828 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2829 {
2830         struct dump_info *dump_info;
2831
2832         ++packets_captured;
2833
2834         ++infodelay;
2835
2836         dump_info = (struct dump_info *)user;
2837
2838         /*
2839          * XXX - this won't force the file to rotate on the specified time
2840          * boundary, but it will rotate on the first packet received after the
2841          * specified Gflag number of seconds. Note: if a Gflag time boundary
2842          * and a Cflag size boundary coincide, the time rotation will occur
2843          * first thereby cancelling the Cflag boundary (since the file should
2844          * be 0).
2845          */
2846         if (Gflag != 0) {
2847                 /* Check if it is time to rotate */
2848                 time_t t;
2849
2850                 /* Get the current time */
2851                 if ((t = time(NULL)) == (time_t)-1) {
2852                         error("%s: can't get current_time: %s",
2853                             __func__, pcap_strerror(errno));
2854                 }
2855
2856
2857                 /* If the time is greater than the specified window, rotate */
2858                 if (t - Gflag_time >= Gflag) {
2859 #ifdef HAVE_CAPSICUM
2860                         FILE *fp;
2861                         int fd;
2862 #endif
2863
2864                         /* Update the Gflag_time */
2865                         Gflag_time = t;
2866                         /* Update Gflag_count */
2867                         Gflag_count++;
2868                         /*
2869                          * Close the current file and open a new one.
2870                          */
2871                         pcap_dump_close(dump_info->pdd);
2872
2873                         /*
2874                          * Compress the file we just closed, if the user asked for it
2875                          */
2876                         if (zflag != NULL)
2877                                 compress_savefile(dump_info->CurrentFileName);
2878
2879                         /*
2880                          * Check to see if we've exceeded the Wflag (when
2881                          * not using Cflag).
2882                          */
2883                         if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
2884                                 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
2885                                     Wflag);
2886                                 info(1);
2887                                 exit_tcpdump(S_SUCCESS);
2888                                 /* NOTREACHED */
2889                         }
2890                         if (dump_info->CurrentFileName != NULL)
2891                                 free(dump_info->CurrentFileName);
2892                         /* Allocate space for max filename + \0. */
2893                         dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2894                         if (dump_info->CurrentFileName == NULL)
2895                                 error("dump_packet_and_trunc: malloc");
2896                         /*
2897                          * Gflag was set otherwise we wouldn't be here. Reset the count
2898                          * so multiple files would end with 1,2,3 in the filename.
2899                          * The counting is handled with the -C flow after this.
2900                          */
2901                         Cflag_count = 0;
2902
2903                         /*
2904                          * This is always the first file in the Cflag
2905                          * rotation: e.g. 0
2906                          * We also don't need numbering if Cflag is not set.
2907                          */
2908                         if (Cflag != 0)
2909                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
2910                                     WflagChars);
2911                         else
2912                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
2913
2914 #ifdef HAVE_LIBCAP_NG
2915                         capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2916                         capng_apply(CAPNG_SELECT_BOTH);
2917 #endif /* HAVE_LIBCAP_NG */
2918 #ifdef HAVE_CAPSICUM
2919                         fd = openat(dump_info->dirfd,
2920                             dump_info->CurrentFileName,
2921                             O_CREAT | O_WRONLY | O_TRUNC, 0644);
2922                         if (fd < 0) {
2923                                 error("unable to open file %s",
2924                                     dump_info->CurrentFileName);
2925                         }
2926                         fp = fdopen(fd, "w");
2927                         if (fp == NULL) {
2928                                 error("unable to fdopen file %s",
2929                                     dump_info->CurrentFileName);
2930                         }
2931                         dump_info->pdd = pcap_dump_fopen(dump_info->pd, fp);
2932 #else   /* !HAVE_CAPSICUM */
2933                         dump_info->pdd = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2934 #endif
2935 #ifdef HAVE_LIBCAP_NG
2936                         capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2937                         capng_apply(CAPNG_SELECT_BOTH);
2938 #endif /* HAVE_LIBCAP_NG */
2939                         if (dump_info->pdd == NULL)
2940                                 error("%s", pcap_geterr(pd));
2941 #ifdef HAVE_CAPSICUM
2942                         set_dumper_capsicum_rights(dump_info->pdd);
2943 #endif
2944                 }
2945         }
2946
2947         /*
2948          * XXX - this won't prevent capture files from getting
2949          * larger than Cflag - the last packet written to the
2950          * file could put it over Cflag.
2951          */
2952         if (Cflag != 0) {
2953 #ifdef HAVE_PCAP_DUMP_FTELL64
2954                 int64_t size = pcap_dump_ftell64(dump_info->pdd);
2955 #else
2956                 /*
2957                  * XXX - this only handles a Cflag value > 2^31-1 on
2958                  * LP64 platforms; to handle ILP32 (32-bit UN*X and
2959                  * Windows) or LLP64 (64-bit Windows) would require
2960                  * a version of libpcap with pcap_dump_ftell64().
2961                  */
2962                 long size = pcap_dump_ftell(dump_info->pdd);
2963 #endif
2964
2965                 if (size == -1)
2966                         error("ftell fails on output file");
2967                 if (size > Cflag) {
2968 #ifdef HAVE_CAPSICUM
2969                         FILE *fp;
2970                         int fd;
2971 #endif
2972
2973                         /*
2974                          * Close the current file and open a new one.
2975                          */
2976                         pcap_dump_close(dump_info->pdd);
2977
2978                         /*
2979                          * Compress the file we just closed, if the user
2980                          * asked for it.
2981                          */
2982                         if (zflag != NULL)
2983                                 compress_savefile(dump_info->CurrentFileName);
2984
2985                         Cflag_count++;
2986                         if (Wflag > 0) {
2987                                 if (Cflag_count >= Wflag)
2988                                         Cflag_count = 0;
2989                         }
2990                         if (dump_info->CurrentFileName != NULL)
2991                                 free(dump_info->CurrentFileName);
2992                         dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2993                         if (dump_info->CurrentFileName == NULL)
2994                                 error("%s: malloc", __func__);
2995                         MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
2996 #ifdef HAVE_LIBCAP_NG
2997                         capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2998                         capng_apply(CAPNG_SELECT_BOTH);
2999 #endif /* HAVE_LIBCAP_NG */
3000 #ifdef HAVE_CAPSICUM
3001                         fd = openat(dump_info->dirfd, dump_info->CurrentFileName,
3002                             O_CREAT | O_WRONLY | O_TRUNC, 0644);
3003                         if (fd < 0) {
3004                                 error("unable to open file %s",
3005                                     dump_info->CurrentFileName);
3006                         }
3007                         fp = fdopen(fd, "w");
3008                         if (fp == NULL) {
3009                                 error("unable to fdopen file %s",
3010                                     dump_info->CurrentFileName);
3011                         }
3012                         dump_info->pdd = pcap_dump_fopen(dump_info->pd, fp);
3013 #else   /* !HAVE_CAPSICUM */
3014                         dump_info->pdd = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
3015 #endif
3016 #ifdef HAVE_LIBCAP_NG
3017                         capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
3018                         capng_apply(CAPNG_SELECT_BOTH);
3019 #endif /* HAVE_LIBCAP_NG */
3020                         if (dump_info->pdd == NULL)
3021                                 error("%s", pcap_geterr(pd));
3022 #ifdef HAVE_CAPSICUM
3023                         set_dumper_capsicum_rights(dump_info->pdd);
3024 #endif
3025                 }
3026         }
3027
3028         pcap_dump((u_char *)dump_info->pdd, h, sp);
3029 #ifdef HAVE_PCAP_DUMP_FLUSH
3030         if (Uflag)
3031                 pcap_dump_flush(dump_info->pdd);
3032 #endif
3033
3034         if (dump_info->ndo != NULL)
3035                 pretty_print_packet(dump_info->ndo, h, sp, packets_captured);
3036
3037         --infodelay;
3038         if (infoprint)
3039                 info(0);
3040 }
3041
3042 static void
3043 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
3044 {
3045         struct dump_info *dump_info;
3046
3047         ++packets_captured;
3048
3049         ++infodelay;
3050
3051         dump_info = (struct dump_info *)user;
3052
3053         pcap_dump((u_char *)dump_info->pdd, h, sp);
3054 #ifdef HAVE_PCAP_DUMP_FLUSH
3055         if (Uflag)
3056                 pcap_dump_flush(dump_info->pdd);
3057 #endif
3058
3059         if (dump_info->ndo != NULL)
3060                 pretty_print_packet(dump_info->ndo, h, sp, packets_captured);
3061
3062         --infodelay;
3063         if (infoprint)
3064                 info(0);
3065 }
3066
3067 static void
3068 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
3069 {
3070         ++packets_captured;
3071
3072         ++infodelay;
3073
3074         if (!count_mode)
3075                 pretty_print_packet((netdissect_options *)user, h, sp, packets_captured);
3076
3077         --infodelay;
3078         if (infoprint)
3079                 info(0);
3080 }
3081
3082 #ifdef SIGNAL_REQ_INFO
3083 static void
3084 requestinfo(int signo _U_)
3085 {
3086         if (infodelay)
3087                 ++infoprint;
3088         else
3089                 info(0);
3090 }
3091 #endif
3092
3093 #ifdef SIGNAL_FLUSH_PCAP
3094 static void
3095 flushpcap(int signo _U_)
3096 {
3097         if (pdd != NULL)
3098                 pcap_dump_flush(pdd);
3099 }
3100 #endif
3101
3102 static void
3103 print_packets_captured (void)
3104 {
3105         static u_int prev_packets_captured, first = 1;
3106
3107         if (infodelay == 0 && (first || packets_captured != prev_packets_captured)) {
3108                 fprintf(stderr, "Got %u\r", packets_captured);
3109                 first = 0;
3110                 prev_packets_captured = packets_captured;
3111         }
3112 }
3113
3114 /*
3115  * Called once each second in verbose mode while dumping to file
3116  */
3117 #ifdef _WIN32
3118 static void CALLBACK verbose_stats_dump(PVOID param _U_,
3119     BOOLEAN timer_fired _U_)
3120 {
3121         print_packets_captured();
3122 }
3123 #else /* _WIN32 */
3124 static void verbose_stats_dump(int sig _U_)
3125 {
3126         print_packets_captured();
3127 }
3128 #endif /* _WIN32 */
3129
3130 USES_APPLE_DEPRECATED_API
3131 static void
3132 print_version(FILE *f)
3133 {
3134 #ifndef HAVE_PCAP_LIB_VERSION
3135   #ifdef HAVE_PCAP_VERSION
3136         extern char pcap_version[];
3137   #else /* HAVE_PCAP_VERSION */
3138         static char pcap_version[] = "unknown";
3139   #endif /* HAVE_PCAP_VERSION */
3140 #endif /* HAVE_PCAP_LIB_VERSION */
3141         const char *smi_version_string;
3142
3143         (void)fprintf(f, "%s version " PACKAGE_VERSION "\n", program_name);
3144 #ifdef HAVE_PCAP_LIB_VERSION
3145         (void)fprintf(f, "%s\n", pcap_lib_version());
3146 #else /* HAVE_PCAP_LIB_VERSION */
3147         (void)fprintf(f, "libpcap version %s\n", pcap_version);
3148 #endif /* HAVE_PCAP_LIB_VERSION */
3149
3150 #if defined(HAVE_LIBCRYPTO) && defined(SSLEAY_VERSION)
3151         (void)fprintf (f, "%s\n", SSLeay_version(SSLEAY_VERSION));
3152 #endif
3153
3154         smi_version_string = nd_smi_version_string();
3155         if (smi_version_string != NULL)
3156                 (void)fprintf (f, "SMI-library: %s\n", smi_version_string);
3157
3158 #if defined(__SANITIZE_ADDRESS__)
3159         (void)fprintf (f, "Compiled with AddressSanitizer/GCC.\n");
3160 #elif defined(__has_feature)
3161 #  if __has_feature(address_sanitizer)
3162         (void)fprintf (f, "Compiled with AddressSanitizer/Clang.\n");
3163 #  elif __has_feature(memory_sanitizer)
3164         (void)fprintf (f, "Compiled with MemorySanitizer/Clang.\n");
3165 #  endif
3166 #endif /* __SANITIZE_ADDRESS__ or __has_feature */
3167 }
3168 USES_APPLE_RST
3169
3170 static void
3171 print_usage(FILE *f)
3172 {
3173         print_version(f);
3174         (void)fprintf(f,
3175 "Usage: %s [-Abd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqStu" U_FLAG "vxX#]" B_FLAG_USAGE " [ -c count ] [--count]\n", program_name);
3176         (void)fprintf(f,
3177 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
3178         (void)fprintf(f,
3179 "\t\t[ -i interface ]" IMMEDIATE_MODE_USAGE j_FLAG_USAGE "\n");
3180 #ifdef HAVE_PCAP_FINDALLDEVS_EX
3181         (void)fprintf(f,
3182 "\t\t" LIST_REMOTE_INTERFACES_USAGE "\n");
3183 #endif
3184 #ifdef USE_LIBSMI
3185         (void)fprintf(f,
3186 "\t\t" m_FLAG_USAGE "\n");
3187 #endif
3188         (void)fprintf(f,
3189 "\t\t[ -M secret ] [ --number ] [ --print ]" Q_FLAG_USAGE "\n");
3190         (void)fprintf(f,
3191 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ --version ]\n");
3192         (void)fprintf(f,
3193 "\t\t[ -V file ] [ -w file ] [ -W filecount ] [ -y datalinktype ]\n");
3194 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
3195         (void)fprintf(f,
3196 "\t\t[ --time-stamp-precision precision ] [ --micro ] [ --nano ]\n");
3197 #endif
3198         (void)fprintf(f,
3199 "\t\t[ -z postrotate-command ] [ -Z user ] [ expression ]\n");
3200 }