1 /* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * Support for splitting captures into multiple files with a maximum 22 * file size: 23 * 24 * Copyright (c) 2001 25 * Seth Webster <swebster@sst.ll.mit.edu> 26 */ 27 28 #ifndef lint 29 static const char copyright[] _U_ = 30 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\ 31 The Regents of the University of California. All rights reserved.\n"; 32 #endif 33 34 /* 35 * tcpdump - dump traffic on a network 36 * 37 * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory. 38 * Mercilessly hacked and occasionally improved since then via the 39 * combined efforts of Van, Steve McCanne and Craig Leres of LBL. 40 */ 41 42 #ifdef HAVE_CONFIG_H 43 #include "config.h" 44 #endif 45 46 /* 47 * Mac OS X may ship pcap.h from libpcap 0.6 with a libpcap based on 48 * 0.8. That means it has pcap_findalldevs() but the header doesn't 49 * define pcap_if_t, meaning that we can't actually *use* pcap_findalldevs(). 50 */ 51 #ifdef HAVE_PCAP_FINDALLDEVS 52 #ifndef HAVE_PCAP_IF_T 53 #undef HAVE_PCAP_FINDALLDEVS 54 #endif 55 #endif 56 57 #include <netdissect-stdinc.h> 58 59 #include <sys/stat.h> 60 61 #ifdef HAVE_FCNTL_H 62 #include <fcntl.h> 63 #endif 64 65 #ifdef HAVE_LIBCRYPTO 66 #include <openssl/crypto.h> 67 #endif 68 69 #ifdef HAVE_GETOPT_LONG 70 #include <getopt.h> 71 #else 72 #include "getopt_long.h" 73 #endif 74 /* Capsicum-specific code requires macros from <net/bpf.h>, which will fail 75 * to compile if <pcap.h> has already been included; including the headers 76 * in the opposite order works fine. 77 */ 78 #ifdef HAVE_CAPSICUM 79 #include <sys/capsicum.h> 80 #include <sys/nv.h> 81 #include <sys/ioccom.h> 82 #include <net/bpf.h> 83 #include <libgen.h> 84 #ifdef HAVE_CASPER 85 #include <libcasper.h> 86 #include <casper/cap_dns.h> 87 #endif /* HAVE_CASPER */ 88 #endif /* HAVE_CAPSICUM */ 89 #include <pcap.h> 90 #include <signal.h> 91 #include <stdio.h> 92 #include <stdarg.h> 93 #include <stdlib.h> 94 #include <string.h> 95 #include <limits.h> 96 #ifndef _WIN32 97 #include <sys/wait.h> 98 #include <sys/resource.h> 99 #include <pwd.h> 100 #include <grp.h> 101 #endif /* _WIN32 */ 102 103 /* capabilities convenience library */ 104 /* If a code depends on HAVE_LIBCAP_NG, it depends also on HAVE_CAP_NG_H. 105 * If HAVE_CAP_NG_H is not defined, undefine HAVE_LIBCAP_NG. 106 * Thus, the later tests are done only on HAVE_LIBCAP_NG. 107 */ 108 #ifdef HAVE_LIBCAP_NG 109 #ifdef HAVE_CAP_NG_H 110 #include <cap-ng.h> 111 #else 112 #undef HAVE_LIBCAP_NG 113 #endif /* HAVE_CAP_NG_H */ 114 #endif /* HAVE_LIBCAP_NG */ 115 116 #ifdef __FreeBSD__ 117 #include <sys/sysctl.h> 118 #endif /* __FreeBSD__ */ 119 120 #include "netdissect.h" 121 #include "interface.h" 122 #include "addrtoname.h" 123 #include "machdep.h" 124 #include "setsignal.h" 125 #include "gmt2local.h" 126 #include "pcap-missing.h" 127 #include "ascii_strcasecmp.h" 128 129 #include "print.h" 130 131 #ifndef PATH_MAX 132 #define PATH_MAX 1024 133 #endif 134 135 #ifdef SIGINFO 136 #define SIGNAL_REQ_INFO SIGINFO 137 #elif SIGUSR1 138 #define SIGNAL_REQ_INFO SIGUSR1 139 #endif 140 141 static int Bflag; /* buffer size */ 142 static long Cflag; /* rotate dump files after this many bytes */ 143 static int Cflag_count; /* Keep track of which file number we're writing */ 144 static int Dflag; /* list available devices and exit */ 145 /* 146 * This is exported because, in some versions of libpcap, if libpcap 147 * is built with optimizer debugging code (which is *NOT* the default 148 * configuration!), the library *imports*(!) a variable named dflag, 149 * under the expectation that tcpdump is exporting it, to govern 150 * how much debugging information to print when optimizing 151 * the generated BPF code. 152 * 153 * This is a horrible hack; newer versions of libpcap don't import 154 * dflag but, instead, *if* built with optimizer debugging code, 155 * *export* a routine to set that flag. 156 */ 157 int dflag; /* print filter code */ 158 static int Gflag; /* rotate dump files after this many seconds */ 159 static int Gflag_count; /* number of files created with Gflag rotation */ 160 static time_t Gflag_time; /* The last time_t the dump file was rotated. */ 161 static int Lflag; /* list available data link types and exit */ 162 static int Iflag; /* rfmon (monitor) mode */ 163 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE 164 static int Jflag; /* list available time stamp types */ 165 #endif 166 static int jflag = -1; /* packet time stamp source */ 167 static int pflag; /* don't go promiscuous */ 168 #ifdef HAVE_PCAP_SETDIRECTION 169 static int Qflag = -1; /* restrict captured packet by send/receive direction */ 170 #endif 171 static int Uflag; /* "unbuffered" output of dump files */ 172 static int Wflag; /* recycle output files after this number of files */ 173 static int WflagChars; 174 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */ 175 static int immediate_mode; 176 177 static int infodelay; 178 static int infoprint; 179 180 char *program_name; 181 182 #ifdef HAVE_CASPER 183 cap_channel_t *capdns; 184 #endif 185 186 /* Forwards */ 187 static void error(FORMAT_STRING(const char *), ...) NORETURN PRINTFLIKE(1, 2); 188 static void warning(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2); 189 static void exit_tcpdump(int) NORETURN; 190 static RETSIGTYPE cleanup(int); 191 static RETSIGTYPE child_cleanup(int); 192 static void print_version(void); 193 static void print_usage(void); 194 static void show_tstamp_types_and_exit(pcap_t *, const char *device) NORETURN; 195 static void show_dlts_and_exit(pcap_t *, const char *device) NORETURN; 196 #ifdef HAVE_PCAP_FINDALLDEVS 197 static void show_devices_and_exit (void) NORETURN; 198 #endif 199 200 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *); 201 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *); 202 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *); 203 static void droproot(const char *, const char *); 204 205 #ifdef SIGNAL_REQ_INFO 206 RETSIGTYPE requestinfo(int); 207 #endif 208 209 #if defined(USE_WIN32_MM_TIMER) 210 #include <MMsystem.h> 211 static UINT timer_id; 212 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR); 213 #elif defined(HAVE_ALARM) 214 static void verbose_stats_dump(int sig); 215 #endif 216 217 static void info(int); 218 static u_int packets_captured; 219 220 #ifdef HAVE_PCAP_FINDALLDEVS 221 static const struct tok status_flags[] = { 222 #ifdef PCAP_IF_UP 223 { PCAP_IF_UP, "Up" }, 224 #endif 225 #ifdef PCAP_IF_RUNNING 226 { PCAP_IF_RUNNING, "Running" }, 227 #endif 228 { PCAP_IF_LOOPBACK, "Loopback" }, 229 { 0, NULL } 230 }; 231 #endif 232 233 static pcap_t *pd; 234 235 static int supports_monitor_mode; 236 237 extern int optind; 238 extern int opterr; 239 extern char *optarg; 240 241 struct dump_info { 242 char *WFileName; 243 char *CurrentFileName; 244 pcap_t *pd; 245 pcap_dumper_t *p; 246 #ifdef HAVE_CAPSICUM 247 int dirfd; 248 #endif 249 }; 250 251 #if defined(HAVE_PCAP_SET_PARSER_DEBUG) 252 /* 253 * We have pcap_set_parser_debug() in libpcap; declare it (it's not declared 254 * by any libpcap header, because it's a special hack, only available if 255 * libpcap was configured to include it, and only intended for use by 256 * libpcap developers trying to debug the parser for filter expressions). 257 */ 258 #ifdef _WIN32 259 __declspec(dllimport) 260 #else /* _WIN32 */ 261 extern 262 #endif /* _WIN32 */ 263 void pcap_set_parser_debug(int); 264 #elif defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG) 265 /* 266 * We don't have pcap_set_parser_debug() in libpcap, but we do have 267 * pcap_debug or yydebug. Make a local version of pcap_set_parser_debug() 268 * to set the flag, and define HAVE_PCAP_SET_PARSER_DEBUG. 269 */ 270 static void 271 pcap_set_parser_debug(int value) 272 { 273 #ifdef HAVE_PCAP_DEBUG 274 extern int pcap_debug; 275 276 pcap_debug = value; 277 #else /* HAVE_PCAP_DEBUG */ 278 extern int yydebug; 279 280 yydebug = value; 281 #endif /* HAVE_PCAP_DEBUG */ 282 } 283 284 #define HAVE_PCAP_SET_PARSER_DEBUG 285 #endif 286 287 #if defined(HAVE_PCAP_SET_OPTIMIZER_DEBUG) 288 /* 289 * We have pcap_set_optimizer_debug() in libpcap; declare it (it's not declared 290 * by any libpcap header, because it's a special hack, only available if 291 * libpcap was configured to include it, and only intended for use by 292 * libpcap developers trying to debug the optimizer for filter expressions). 293 */ 294 #ifdef _WIN32 295 __declspec(dllimport) 296 #else /* _WIN32 */ 297 extern 298 #endif /* _WIN32 */ 299 void pcap_set_optimizer_debug(int); 300 #endif 301 302 /* VARARGS */ 303 static void 304 error(const char *fmt, ...) 305 { 306 va_list ap; 307 308 (void)fprintf(stderr, "%s: ", program_name); 309 va_start(ap, fmt); 310 (void)vfprintf(stderr, fmt, ap); 311 va_end(ap); 312 if (*fmt) { 313 fmt += strlen(fmt); 314 if (fmt[-1] != '\n') 315 (void)fputc('\n', stderr); 316 } 317 exit_tcpdump(1); 318 /* NOTREACHED */ 319 } 320 321 /* VARARGS */ 322 static void 323 warning(const char *fmt, ...) 324 { 325 va_list ap; 326 327 (void)fprintf(stderr, "%s: WARNING: ", program_name); 328 va_start(ap, fmt); 329 (void)vfprintf(stderr, fmt, ap); 330 va_end(ap); 331 if (*fmt) { 332 fmt += strlen(fmt); 333 if (fmt[-1] != '\n') 334 (void)fputc('\n', stderr); 335 } 336 } 337 338 static void 339 exit_tcpdump(int status) 340 { 341 nd_cleanup(); 342 exit(status); 343 } 344 345 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE 346 static void 347 show_tstamp_types_and_exit(pcap_t *pc, const char *device) 348 { 349 int n_tstamp_types; 350 int *tstamp_types = 0; 351 const char *tstamp_type_name; 352 int i; 353 354 n_tstamp_types = pcap_list_tstamp_types(pc, &tstamp_types); 355 if (n_tstamp_types < 0) 356 error("%s", pcap_geterr(pc)); 357 358 if (n_tstamp_types == 0) { 359 fprintf(stderr, "Time stamp type cannot be set for %s\n", 360 device); 361 exit_tcpdump(0); 362 } 363 fprintf(stderr, "Time stamp types for %s (use option -j to set):\n", 364 device); 365 for (i = 0; i < n_tstamp_types; i++) { 366 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]); 367 if (tstamp_type_name != NULL) { 368 (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name, 369 pcap_tstamp_type_val_to_description(tstamp_types[i])); 370 } else { 371 (void) fprintf(stderr, " %d\n", tstamp_types[i]); 372 } 373 } 374 pcap_free_tstamp_types(tstamp_types); 375 exit_tcpdump(0); 376 } 377 #endif 378 379 static void 380 show_dlts_and_exit(pcap_t *pc, const char *device) 381 { 382 int n_dlts, i; 383 int *dlts = 0; 384 const char *dlt_name; 385 386 n_dlts = pcap_list_datalinks(pc, &dlts); 387 if (n_dlts < 0) 388 error("%s", pcap_geterr(pc)); 389 else if (n_dlts == 0 || !dlts) 390 error("No data link types."); 391 392 /* 393 * If the interface is known to support monitor mode, indicate 394 * whether these are the data link types available when not in 395 * monitor mode, if -I wasn't specified, or when in monitor mode, 396 * when -I was specified (the link-layer types available in 397 * monitor mode might be different from the ones available when 398 * not in monitor mode). 399 */ 400 if (supports_monitor_mode) 401 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n", 402 device, 403 Iflag ? "when in monitor mode" : "when not in monitor mode"); 404 else 405 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n", 406 device); 407 408 for (i = 0; i < n_dlts; i++) { 409 dlt_name = pcap_datalink_val_to_name(dlts[i]); 410 if (dlt_name != NULL) { 411 (void) fprintf(stderr, " %s (%s)", dlt_name, 412 pcap_datalink_val_to_description(dlts[i])); 413 414 /* 415 * OK, does tcpdump handle that type? 416 */ 417 if (!has_printer(dlts[i])) 418 (void) fprintf(stderr, " (printing not supported)"); 419 fprintf(stderr, "\n"); 420 } else { 421 (void) fprintf(stderr, " DLT %d (printing not supported)\n", 422 dlts[i]); 423 } 424 } 425 #ifdef HAVE_PCAP_FREE_DATALINKS 426 pcap_free_datalinks(dlts); 427 #endif 428 exit_tcpdump(0); 429 } 430 431 #ifdef HAVE_PCAP_FINDALLDEVS 432 static void 433 show_devices_and_exit (void) 434 { 435 pcap_if_t *dev, *devlist; 436 char ebuf[PCAP_ERRBUF_SIZE]; 437 int i; 438 439 if (pcap_findalldevs(&devlist, ebuf) < 0) 440 error("%s", ebuf); 441 for (i = 0, dev = devlist; dev != NULL; i++, dev = dev->next) { 442 printf("%d.%s", i+1, dev->name); 443 if (dev->description != NULL) 444 printf(" (%s)", dev->description); 445 if (dev->flags != 0) 446 printf(" [%s]", bittok2str(status_flags, "none", dev->flags)); 447 printf("\n"); 448 } 449 pcap_freealldevs(devlist); 450 exit_tcpdump(0); 451 } 452 #endif /* HAVE_PCAP_FINDALLDEVS */ 453 454 /* 455 * Short options. 456 * 457 * Note that there we use all letters for short options except for g, k, 458 * o, and P, and those are used by other versions of tcpdump, and we should 459 * only use them for the same purposes that the other versions of tcpdump 460 * use them: 461 * 462 * OS X tcpdump uses -g to force non--v output for IP to be on one 463 * line, making it more "g"repable; 464 * 465 * OS X tcpdump uses -k to specify that packet comments in pcap-ng files 466 * should be printed; 467 * 468 * OpenBSD tcpdump uses -o to indicate that OS fingerprinting should be done 469 * for hosts sending TCP SYN packets; 470 * 471 * OS X tcpdump uses -P to indicate that -w should write pcap-ng rather 472 * than pcap files. 473 * 474 * OS X tcpdump also uses -Q to specify expressions that match packet 475 * metadata, including but not limited to the packet direction. 476 * The expression syntax is different from a simple "in|out|inout", 477 * and those expressions aren't accepted by OS X tcpdump, but the 478 * equivalents would be "in" = "dir=in", "out" = "dir=out", and 479 * "inout" = "dir=in or dir=out", and the parser could conceivably 480 * special-case "in", "out", and "inout" as expressions for backwards 481 * compatibility, so all is not (yet) lost. 482 */ 483 484 /* 485 * Set up flags that might or might not be supported depending on the 486 * version of libpcap we're using. 487 */ 488 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32) 489 #define B_FLAG "B:" 490 #define B_FLAG_USAGE " [ -B size ]" 491 #else /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */ 492 #define B_FLAG 493 #define B_FLAG_USAGE 494 #endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */ 495 496 #ifdef HAVE_PCAP_CREATE 497 #define I_FLAG "I" 498 #else /* HAVE_PCAP_CREATE */ 499 #define I_FLAG 500 #endif /* HAVE_PCAP_CREATE */ 501 502 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE 503 #define j_FLAG "j:" 504 #define j_FLAG_USAGE " [ -j tstamptype ]" 505 #define J_FLAG "J" 506 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */ 507 #define j_FLAG 508 #define j_FLAG_USAGE 509 #define J_FLAG 510 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */ 511 512 #ifdef HAVE_PCAP_FINDALLDEVS 513 #define D_FLAG "D" 514 #else 515 #define D_FLAG 516 #endif 517 518 #ifdef HAVE_PCAP_DUMP_FLUSH 519 #define U_FLAG "U" 520 #else 521 #define U_FLAG 522 #endif 523 524 #ifdef HAVE_PCAP_SETDIRECTION 525 #define Q_FLAG "Q:" 526 #else 527 #define Q_FLAG 528 #endif 529 530 #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:#" 531 532 /* 533 * Long options. 534 * 535 * We do not currently have long options corresponding to all short 536 * options; we should probably pick appropriate option names for them. 537 * 538 * However, the short options where the number of times the option is 539 * specified matters, such as -v and -d and -t, should probably not 540 * just map to a long option, as saying 541 * 542 * tcpdump --verbose --verbose 543 * 544 * doesn't make sense; it should be --verbosity={N} or something such 545 * as that. 546 * 547 * For long options with no corresponding short options, we define values 548 * outside the range of ASCII graphic characters, make that the last 549 * component of the entry for the long option, and have a case for that 550 * option in the switch statement. 551 */ 552 #define OPTION_VERSION 128 553 #define OPTION_TSTAMP_PRECISION 129 554 #define OPTION_IMMEDIATE_MODE 130 555 556 static const struct option longopts[] = { 557 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32) 558 { "buffer-size", required_argument, NULL, 'B' }, 559 #endif 560 { "list-interfaces", no_argument, NULL, 'D' }, 561 { "help", no_argument, NULL, 'h' }, 562 { "interface", required_argument, NULL, 'i' }, 563 #ifdef HAVE_PCAP_CREATE 564 { "monitor-mode", no_argument, NULL, 'I' }, 565 #endif 566 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE 567 { "time-stamp-type", required_argument, NULL, 'j' }, 568 { "list-time-stamp-types", no_argument, NULL, 'J' }, 569 #endif 570 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION 571 { "time-stamp-precision", required_argument, NULL, OPTION_TSTAMP_PRECISION}, 572 #endif 573 { "dont-verify-checksums", no_argument, NULL, 'K' }, 574 { "list-data-link-types", no_argument, NULL, 'L' }, 575 { "no-optimize", no_argument, NULL, 'O' }, 576 { "no-promiscuous-mode", no_argument, NULL, 'p' }, 577 #ifdef HAVE_PCAP_SETDIRECTION 578 { "direction", required_argument, NULL, 'Q' }, 579 #endif 580 { "snapshot-length", required_argument, NULL, 's' }, 581 { "absolute-tcp-sequence-numbers", no_argument, NULL, 'S' }, 582 #ifdef HAVE_PCAP_DUMP_FLUSH 583 { "packet-buffered", no_argument, NULL, 'U' }, 584 #endif 585 { "linktype", required_argument, NULL, 'y' }, 586 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE 587 { "immediate-mode", no_argument, NULL, OPTION_IMMEDIATE_MODE }, 588 #endif 589 #ifdef HAVE_PCAP_SET_PARSER_DEBUG 590 { "debug-filter-parser", no_argument, NULL, 'Y' }, 591 #endif 592 { "relinquish-privileges", required_argument, NULL, 'Z' }, 593 { "number", no_argument, NULL, '#' }, 594 { "version", no_argument, NULL, OPTION_VERSION }, 595 { NULL, 0, NULL, 0 } 596 }; 597 598 #ifndef _WIN32 599 /* Drop root privileges and chroot if necessary */ 600 static void 601 droproot(const char *username, const char *chroot_dir) 602 { 603 struct passwd *pw = NULL; 604 605 if (chroot_dir && !username) { 606 fprintf(stderr, "%s: Chroot without dropping root is insecure\n", 607 program_name); 608 exit_tcpdump(1); 609 } 610 611 pw = getpwnam(username); 612 if (pw) { 613 if (chroot_dir) { 614 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) { 615 fprintf(stderr, "%s: Couldn't chroot/chdir to '%.64s': %s\n", 616 program_name, chroot_dir, pcap_strerror(errno)); 617 exit_tcpdump(1); 618 } 619 } 620 #ifdef HAVE_LIBCAP_NG 621 { 622 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG); 623 if (ret < 0) { 624 fprintf(stderr, "error : ret %d\n", ret); 625 } else { 626 fprintf(stderr, "dropped privs to %s\n", username); 627 } 628 } 629 #else 630 if (initgroups(pw->pw_name, pw->pw_gid) != 0 || 631 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) { 632 fprintf(stderr, "%s: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n", 633 program_name, username, 634 (unsigned long)pw->pw_uid, 635 (unsigned long)pw->pw_gid, 636 pcap_strerror(errno)); 637 exit_tcpdump(1); 638 } 639 else { 640 fprintf(stderr, "dropped privs to %s\n", username); 641 } 642 #endif /* HAVE_LIBCAP_NG */ 643 } 644 else { 645 fprintf(stderr, "%s: Couldn't find user '%.32s'\n", 646 program_name, username); 647 exit_tcpdump(1); 648 } 649 #ifdef HAVE_LIBCAP_NG 650 /* We don't need CAP_SETUID, CAP_SETGID and CAP_SYS_CHROOT any more. */ 651 capng_updatev( 652 CAPNG_DROP, 653 CAPNG_EFFECTIVE | CAPNG_PERMITTED, 654 CAP_SETUID, 655 CAP_SETGID, 656 CAP_SYS_CHROOT, 657 -1); 658 capng_apply(CAPNG_SELECT_BOTH); 659 #endif /* HAVE_LIBCAP_NG */ 660 661 } 662 #endif /* _WIN32 */ 663 664 static int 665 getWflagChars(int x) 666 { 667 int c = 0; 668 669 x -= 1; 670 while (x > 0) { 671 c += 1; 672 x /= 10; 673 } 674 675 return c; 676 } 677 678 679 static void 680 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars) 681 { 682 char *filename = malloc(PATH_MAX + 1); 683 if (filename == NULL) 684 error("Makefilename: malloc"); 685 686 /* Process with strftime if Gflag is set. */ 687 if (Gflag != 0) { 688 struct tm *local_tm; 689 690 /* Convert Gflag_time to a usable format */ 691 if ((local_tm = localtime(&Gflag_time)) == NULL) { 692 error("MakeTimedFilename: localtime"); 693 } 694 695 /* There's no good way to detect an error in strftime since a return 696 * value of 0 isn't necessarily failure. 697 */ 698 strftime(filename, PATH_MAX, orig_name, local_tm); 699 } else { 700 strncpy(filename, orig_name, PATH_MAX); 701 } 702 703 if (cnt == 0 && max_chars == 0) 704 strncpy(buffer, filename, PATH_MAX + 1); 705 else 706 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX) 707 /* Report an error if the filename is too large */ 708 error("too many output files or filename is too long (> %d)", PATH_MAX); 709 free(filename); 710 } 711 712 static char * 713 get_next_file(FILE *VFile, char *ptr) 714 { 715 char *ret; 716 717 ret = fgets(ptr, PATH_MAX, VFile); 718 if (!ret) 719 return NULL; 720 721 if (ptr[strlen(ptr) - 1] == '\n') 722 ptr[strlen(ptr) - 1] = '\0'; 723 724 return ret; 725 } 726 727 #ifdef HAVE_CASPER 728 static cap_channel_t * 729 capdns_setup(void) 730 { 731 cap_channel_t *capcas, *capdnsloc; 732 const char *types[1]; 733 int families[2]; 734 735 capcas = cap_init(); 736 if (capcas == NULL) 737 error("unable to create casper process"); 738 capdnsloc = cap_service_open(capcas, "system.dns"); 739 /* Casper capability no longer needed. */ 740 cap_close(capcas); 741 if (capdnsloc == NULL) 742 error("unable to open system.dns service"); 743 /* Limit system.dns to reverse DNS lookups. */ 744 types[0] = "ADDR2NAME"; 745 if (cap_dns_type_limit(capdnsloc, types, 1) < 0) 746 error("unable to limit access to system.dns service"); 747 families[0] = AF_INET; 748 families[1] = AF_INET6; 749 if (cap_dns_family_limit(capdnsloc, families, 2) < 0) 750 error("unable to limit access to system.dns service"); 751 752 return (capdnsloc); 753 } 754 #endif /* HAVE_CASPER */ 755 756 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION 757 static int 758 tstamp_precision_from_string(const char *precision) 759 { 760 if (strncmp(precision, "nano", strlen("nano")) == 0) 761 return PCAP_TSTAMP_PRECISION_NANO; 762 763 if (strncmp(precision, "micro", strlen("micro")) == 0) 764 return PCAP_TSTAMP_PRECISION_MICRO; 765 766 return -EINVAL; 767 } 768 769 static const char * 770 tstamp_precision_to_string(int precision) 771 { 772 switch (precision) { 773 774 case PCAP_TSTAMP_PRECISION_MICRO: 775 return "micro"; 776 777 case PCAP_TSTAMP_PRECISION_NANO: 778 return "nano"; 779 780 default: 781 return "unknown"; 782 } 783 } 784 #endif 785 786 #ifdef HAVE_CAPSICUM 787 /* 788 * Ensure that, on a dump file's descriptor, we have all the rights 789 * necessary to make the standard I/O library work with an fdopen()ed 790 * FILE * from that descriptor. 791 * 792 * A long time ago, in a galaxy far far away, AT&T decided that, instead 793 * of providing separate APIs for getting and setting the FD_ flags on a 794 * descriptor, getting and setting the O_ flags on a descriptor, and 795 * locking files, they'd throw them all into a kitchen-sink fcntl() call 796 * along the lines of ioctl(), the fact that ioctl() operations are 797 * largely specific to particular character devices but fcntl() operations 798 * are either generic to all descriptors or generic to all descriptors for 799 * regular files nonwithstanding. 800 * 801 * The Capsicum people decided that fine-grained control of descriptor 802 * operations was required, so that you need to grant permission for 803 * reading, writing, seeking, and fcntl-ing. The latter, courtesy of 804 * AT&T's decision, means that "fcntl-ing" isn't a thing, but a motley 805 * collection of things, so there are *individual* fcntls for which 806 * permission needs to be granted. 807 * 808 * The FreeBSD standard I/O people implemented some optimizations that 809 * requires that the standard I/O routines be able to determine whether 810 * the descriptor for the FILE * is open append-only or not; as that 811 * descriptor could have come from an open() rather than an fopen(), 812 * that requires that it be able to do an F_GETFL fcntl() to read 813 * the O_ flags. 814 * 815 * Tcpdump uses ftell() to determine how much data has been written 816 * to a file in order to, when used with -C, determine when it's time 817 * to rotate capture files. ftell() therefore needs to do an lseek() 818 * to find out the file offset and must, thanks to the aforementioned 819 * optimization, also know whether the descriptor is open append-only 820 * or not. 821 * 822 * The net result of all the above is that we need to grant CAP_SEEK, 823 * CAP_WRITE, and CAP_FCNTL with the CAP_FCNTL_GETFL subcapability. 824 * 825 * Perhaps this is the universe's way of saying that either 826 * 827 * 1) there needs to be an fopenat() call and a pcap_dump_openat() call 828 * using it, so that Capsicum-capable tcpdump wouldn't need to do 829 * an fdopen() 830 * 831 * or 832 * 833 * 2) there needs to be a cap_fdopen() call in the FreeBSD standard 834 * I/O library that knows what rights are needed by the standard 835 * I/O library, based on the open mode, and assigns them, perhaps 836 * with an additional argument indicating, for example, whether 837 * seeking should be allowed, so that tcpdump doesn't need to know 838 * what the standard I/O library happens to require this week. 839 */ 840 static void 841 set_dumper_capsicum_rights(pcap_dumper_t *p) 842 { 843 int fd = fileno(pcap_dump_file(p)); 844 cap_rights_t rights; 845 846 cap_rights_init(&rights, CAP_SEEK, CAP_WRITE, CAP_FCNTL); 847 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) { 848 error("unable to limit dump descriptor"); 849 } 850 if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) { 851 error("unable to limit dump descriptor fcntls"); 852 } 853 } 854 #endif 855 856 /* 857 * Copy arg vector into a new buffer, concatenating arguments with spaces. 858 */ 859 static char * 860 copy_argv(register char **argv) 861 { 862 register char **p; 863 register u_int len = 0; 864 char *buf; 865 char *src, *dst; 866 867 p = argv; 868 if (*p == NULL) 869 return 0; 870 871 while (*p) 872 len += strlen(*p++) + 1; 873 874 buf = (char *)malloc(len); 875 if (buf == NULL) 876 error("copy_argv: malloc"); 877 878 p = argv; 879 dst = buf; 880 while ((src = *p++) != NULL) { 881 while ((*dst++ = *src++) != '\0') 882 ; 883 dst[-1] = ' '; 884 } 885 dst[-1] = '\0'; 886 887 return buf; 888 } 889 890 /* 891 * On Windows, we need to open the file in binary mode, so that 892 * we get all the bytes specified by the size we get from "fstat()". 893 * On UNIX, that's not necessary. O_BINARY is defined on Windows; 894 * we define it as 0 if it's not defined, so it does nothing. 895 */ 896 #ifndef O_BINARY 897 #define O_BINARY 0 898 #endif 899 900 static char * 901 read_infile(char *fname) 902 { 903 register int i, fd, cc; 904 register char *cp; 905 struct stat buf; 906 907 fd = open(fname, O_RDONLY|O_BINARY); 908 if (fd < 0) 909 error("can't open %s: %s", fname, pcap_strerror(errno)); 910 911 if (fstat(fd, &buf) < 0) 912 error("can't stat %s: %s", fname, pcap_strerror(errno)); 913 914 cp = malloc((u_int)buf.st_size + 1); 915 if (cp == NULL) 916 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1, 917 fname, pcap_strerror(errno)); 918 cc = read(fd, cp, (u_int)buf.st_size); 919 if (cc < 0) 920 error("read %s: %s", fname, pcap_strerror(errno)); 921 if (cc != buf.st_size) 922 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size); 923 924 close(fd); 925 /* replace "# comment" with spaces */ 926 for (i = 0; i < cc; i++) { 927 if (cp[i] == '#') 928 while (i < cc && cp[i] != '\n') 929 cp[i++] = ' '; 930 } 931 cp[cc] = '\0'; 932 return (cp); 933 } 934 935 #ifdef HAVE_PCAP_FINDALLDEVS 936 static long 937 parse_interface_number(const char *device) 938 { 939 long devnum; 940 char *end; 941 942 devnum = strtol(device, &end, 10); 943 if (device != end && *end == '\0') { 944 /* 945 * It's all-numeric, but is it a valid number? 946 */ 947 if (devnum <= 0) { 948 /* 949 * No, it's not an ordinal. 950 */ 951 error("Invalid adapter index"); 952 } 953 return (devnum); 954 } else { 955 /* 956 * It's not all-numeric; return -1, so our caller 957 * knows that. 958 */ 959 return (-1); 960 } 961 } 962 963 static char * 964 find_interface_by_number(long devnum) 965 { 966 pcap_if_t *dev, *devlist; 967 long i; 968 char ebuf[PCAP_ERRBUF_SIZE]; 969 char *device; 970 971 if (pcap_findalldevs(&devlist, ebuf) < 0) 972 error("%s", ebuf); 973 /* 974 * Look for the devnum-th entry in the list of devices (1-based). 975 */ 976 for (i = 0, dev = devlist; i < devnum-1 && dev != NULL; 977 i++, dev = dev->next) 978 ; 979 if (dev == NULL) 980 error("Invalid adapter index"); 981 device = strdup(dev->name); 982 pcap_freealldevs(devlist); 983 return (device); 984 } 985 #endif 986 987 static pcap_t * 988 open_interface(const char *device, netdissect_options *ndo, char *ebuf) 989 { 990 pcap_t *pc; 991 #ifdef HAVE_PCAP_CREATE 992 int status; 993 char *cp; 994 #endif 995 996 #ifdef HAVE_PCAP_CREATE 997 pc = pcap_create(device, ebuf); 998 if (pc == NULL) { 999 /* 1000 * If this failed with "No such device", that means 1001 * the interface doesn't exist; return NULL, so that 1002 * the caller can see whether the device name is 1003 * actually an interface index. 1004 */ 1005 if (strstr(ebuf, "No such device") != NULL) 1006 return (NULL); 1007 error("%s", ebuf); 1008 } 1009 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE 1010 if (Jflag) 1011 show_tstamp_types_and_exit(pc, device); 1012 #endif 1013 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION 1014 status = pcap_set_tstamp_precision(pc, ndo->ndo_tstamp_precision); 1015 if (status != 0) 1016 error("%s: Can't set %ssecond time stamp precision: %s", 1017 device, 1018 tstamp_precision_to_string(ndo->ndo_tstamp_precision), 1019 pcap_statustostr(status)); 1020 #endif 1021 1022 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE 1023 if (immediate_mode) { 1024 status = pcap_set_immediate_mode(pc, 1); 1025 if (status != 0) 1026 error("%s: Can't set immediate mode: %s", 1027 device, 1028 pcap_statustostr(status)); 1029 } 1030 #endif 1031 /* 1032 * Is this an interface that supports monitor mode? 1033 */ 1034 if (pcap_can_set_rfmon(pc) == 1) 1035 supports_monitor_mode = 1; 1036 else 1037 supports_monitor_mode = 0; 1038 status = pcap_set_snaplen(pc, ndo->ndo_snaplen); 1039 if (status != 0) 1040 error("%s: Can't set snapshot length: %s", 1041 device, pcap_statustostr(status)); 1042 status = pcap_set_promisc(pc, !pflag); 1043 if (status != 0) 1044 error("%s: Can't set promiscuous mode: %s", 1045 device, pcap_statustostr(status)); 1046 if (Iflag) { 1047 status = pcap_set_rfmon(pc, 1); 1048 if (status != 0) 1049 error("%s: Can't set monitor mode: %s", 1050 device, pcap_statustostr(status)); 1051 } 1052 status = pcap_set_timeout(pc, 1000); 1053 if (status != 0) 1054 error("%s: pcap_set_timeout failed: %s", 1055 device, pcap_statustostr(status)); 1056 if (Bflag != 0) { 1057 status = pcap_set_buffer_size(pc, Bflag); 1058 if (status != 0) 1059 error("%s: Can't set buffer size: %s", 1060 device, pcap_statustostr(status)); 1061 } 1062 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE 1063 if (jflag != -1) { 1064 status = pcap_set_tstamp_type(pc, jflag); 1065 if (status < 0) 1066 error("%s: Can't set time stamp type: %s", 1067 device, pcap_statustostr(status)); 1068 } 1069 #endif 1070 status = pcap_activate(pc); 1071 if (status < 0) { 1072 /* 1073 * pcap_activate() failed. 1074 */ 1075 cp = pcap_geterr(pc); 1076 if (status == PCAP_ERROR) 1077 error("%s", cp); 1078 else if (status == PCAP_ERROR_NO_SUCH_DEVICE) { 1079 /* 1080 * Return an error for our caller to handle. 1081 */ 1082 snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s\n(%s)", 1083 device, pcap_statustostr(status), cp); 1084 pcap_close(pc); 1085 return (NULL); 1086 } else if (status == PCAP_ERROR_PERM_DENIED && *cp != '\0') 1087 error("%s: %s\n(%s)", device, 1088 pcap_statustostr(status), cp); 1089 #ifdef __FreeBSD__ 1090 else if (status == PCAP_ERROR_RFMON_NOTSUP && 1091 strncmp(device, "wlan", 4) == 0) { 1092 char parent[8], newdev[8]; 1093 char sysctl[32]; 1094 size_t s = sizeof(parent); 1095 1096 snprintf(sysctl, sizeof(sysctl), 1097 "net.wlan.%d.%%parent", atoi(device + 4)); 1098 sysctlbyname(sysctl, parent, &s, NULL, 0); 1099 strlcpy(newdev, device, sizeof(newdev)); 1100 /* Suggest a new wlan device. */ 1101 /* FIXME: incrementing the index this way is not going to work well 1102 * when the index is 9 or greater but the only consequence in this 1103 * specific case would be an error message that looks a bit odd. 1104 */ 1105 newdev[strlen(newdev)-1]++; 1106 error("%s is not a monitor mode VAP\n" 1107 "To create a new monitor mode VAP use:\n" 1108 " ifconfig %s create wlandev %s wlanmode monitor\n" 1109 "and use %s as the tcpdump interface", 1110 device, newdev, parent, newdev); 1111 } 1112 #endif 1113 else 1114 error("%s: %s", device, 1115 pcap_statustostr(status)); 1116 } else if (status > 0) { 1117 /* 1118 * pcap_activate() succeeded, but it's warning us 1119 * of a problem it had. 1120 */ 1121 cp = pcap_geterr(pc); 1122 if (status == PCAP_WARNING) 1123 warning("%s", cp); 1124 else if (status == PCAP_WARNING_PROMISC_NOTSUP && 1125 *cp != '\0') 1126 warning("%s: %s\n(%s)", device, 1127 pcap_statustostr(status), cp); 1128 else 1129 warning("%s: %s", device, 1130 pcap_statustostr(status)); 1131 } 1132 #ifdef HAVE_PCAP_SETDIRECTION 1133 if (Qflag != -1) { 1134 status = pcap_setdirection(pc, Qflag); 1135 if (status != 0) 1136 error("%s: pcap_setdirection() failed: %s", 1137 device, pcap_geterr(pc)); 1138 } 1139 #endif /* HAVE_PCAP_SETDIRECTION */ 1140 #else /* HAVE_PCAP_CREATE */ 1141 *ebuf = '\0'; 1142 pc = pcap_open_live(device, ndo->ndo_snaplen, !pflag, 1000, ebuf); 1143 if (pc == NULL) { 1144 /* 1145 * If this failed with "No such device", that means 1146 * the interface doesn't exist; return NULL, so that 1147 * the caller can see whether the device name is 1148 * actually an interface index. 1149 */ 1150 if (strstr(ebuf, "No such device") != NULL) 1151 return (NULL); 1152 error("%s", ebuf); 1153 } 1154 if (*ebuf) 1155 warning("%s", ebuf); 1156 #endif /* HAVE_PCAP_CREATE */ 1157 1158 return (pc); 1159 } 1160 1161 int 1162 main(int argc, char **argv) 1163 { 1164 register int cnt, op, i; 1165 bpf_u_int32 localnet =0 , netmask = 0; 1166 int timezone_offset = 0; 1167 register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName; 1168 pcap_handler callback; 1169 int dlt; 1170 const char *dlt_name; 1171 struct bpf_program fcode; 1172 #ifndef _WIN32 1173 RETSIGTYPE (*oldhandler)(int); 1174 #endif 1175 struct dump_info dumpinfo; 1176 u_char *pcap_userdata; 1177 char ebuf[PCAP_ERRBUF_SIZE]; 1178 char VFileLine[PATH_MAX + 1]; 1179 char *username = NULL; 1180 char *chroot_dir = NULL; 1181 char *ret = NULL; 1182 char *end; 1183 #ifdef HAVE_PCAP_FINDALLDEVS 1184 pcap_if_t *devlist; 1185 long devnum; 1186 #endif 1187 int status; 1188 FILE *VFile; 1189 #ifdef HAVE_CAPSICUM 1190 cap_rights_t rights; 1191 int cansandbox; 1192 #endif /* HAVE_CAPSICUM */ 1193 int Oflag = 1; /* run filter code optimizer */ 1194 int yflag_dlt = -1; 1195 const char *yflag_dlt_name = NULL; 1196 1197 netdissect_options Ndo; 1198 netdissect_options *ndo = &Ndo; 1199 1200 /* 1201 * Initialize the netdissect code. 1202 */ 1203 if (nd_init(ebuf, sizeof ebuf) == -1) 1204 error("%s", ebuf); 1205 1206 memset(ndo, 0, sizeof(*ndo)); 1207 ndo_set_function_pointers(ndo); 1208 ndo->ndo_snaplen = DEFAULT_SNAPLEN; 1209 1210 cnt = -1; 1211 device = NULL; 1212 infile = NULL; 1213 RFileName = NULL; 1214 VFileName = NULL; 1215 VFile = NULL; 1216 WFileName = NULL; 1217 dlt = -1; 1218 if ((cp = strrchr(argv[0], '/')) != NULL) 1219 ndo->program_name = program_name = cp + 1; 1220 else 1221 ndo->program_name = program_name = argv[0]; 1222 1223 #ifdef _WIN32 1224 if (pcap_wsockinit() != 0) 1225 error("Attempting to initialize Winsock failed"); 1226 #endif /* _WIN32 */ 1227 1228 /* 1229 * On platforms where the CPU doesn't support unaligned loads, 1230 * force unaligned accesses to abort with SIGBUS, rather than 1231 * being fixed up (slowly) by the OS kernel; on those platforms, 1232 * misaligned accesses are bugs, and we want tcpdump to crash so 1233 * that the bugs are reported. 1234 */ 1235 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0) 1236 error("%s", ebuf); 1237 1238 while ( 1239 (op = getopt_long(argc, argv, SHORTOPTS, longopts, NULL)) != -1) 1240 switch (op) { 1241 1242 case 'a': 1243 /* compatibility for old -a */ 1244 break; 1245 1246 case 'A': 1247 ++ndo->ndo_Aflag; 1248 break; 1249 1250 case 'b': 1251 ++ndo->ndo_bflag; 1252 break; 1253 1254 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32) 1255 case 'B': 1256 Bflag = atoi(optarg)*1024; 1257 if (Bflag <= 0) 1258 error("invalid packet buffer size %s", optarg); 1259 break; 1260 #endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */ 1261 1262 case 'c': 1263 cnt = atoi(optarg); 1264 if (cnt <= 0) 1265 error("invalid packet count %s", optarg); 1266 break; 1267 1268 case 'C': 1269 Cflag = atoi(optarg) * 1000000; 1270 if (Cflag <= 0) 1271 error("invalid file size %s", optarg); 1272 break; 1273 1274 case 'd': 1275 ++dflag; 1276 break; 1277 1278 case 'D': 1279 Dflag++; 1280 break; 1281 1282 case 'L': 1283 Lflag++; 1284 break; 1285 1286 case 'e': 1287 ++ndo->ndo_eflag; 1288 break; 1289 1290 case 'E': 1291 #ifndef HAVE_LIBCRYPTO 1292 warning("crypto code not compiled in"); 1293 #endif 1294 ndo->ndo_espsecret = optarg; 1295 break; 1296 1297 case 'f': 1298 ++ndo->ndo_fflag; 1299 break; 1300 1301 case 'F': 1302 infile = optarg; 1303 break; 1304 1305 case 'G': 1306 Gflag = atoi(optarg); 1307 if (Gflag < 0) 1308 error("invalid number of seconds %s", optarg); 1309 1310 /* We will create one file initially. */ 1311 Gflag_count = 0; 1312 1313 /* Grab the current time for rotation use. */ 1314 if ((Gflag_time = time(NULL)) == (time_t)-1) { 1315 error("main: can't get current time: %s", 1316 pcap_strerror(errno)); 1317 } 1318 break; 1319 1320 case 'h': 1321 print_usage(); 1322 exit_tcpdump(0); 1323 break; 1324 1325 case 'H': 1326 ++ndo->ndo_Hflag; 1327 break; 1328 1329 case 'i': 1330 device = optarg; 1331 break; 1332 1333 #ifdef HAVE_PCAP_CREATE 1334 case 'I': 1335 ++Iflag; 1336 break; 1337 #endif /* HAVE_PCAP_CREATE */ 1338 1339 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE 1340 case 'j': 1341 jflag = pcap_tstamp_type_name_to_val(optarg); 1342 if (jflag < 0) 1343 error("invalid time stamp type %s", optarg); 1344 break; 1345 1346 case 'J': 1347 Jflag++; 1348 break; 1349 #endif 1350 1351 case 'l': 1352 #ifdef _WIN32 1353 /* 1354 * _IOLBF is the same as _IOFBF in Microsoft's C 1355 * libraries; the only alternative they offer 1356 * is _IONBF. 1357 * 1358 * XXX - this should really be checking for MSVC++, 1359 * not _WIN32, if, for example, MinGW has its own 1360 * C library that is more UNIX-compatible. 1361 */ 1362 setvbuf(stdout, NULL, _IONBF, 0); 1363 #else /* _WIN32 */ 1364 #ifdef HAVE_SETLINEBUF 1365 setlinebuf(stdout); 1366 #else 1367 setvbuf(stdout, NULL, _IOLBF, 0); 1368 #endif 1369 #endif /* _WIN32 */ 1370 break; 1371 1372 case 'K': 1373 ++ndo->ndo_Kflag; 1374 break; 1375 1376 case 'm': 1377 if (nd_have_smi_support()) { 1378 if (nd_load_smi_module(optarg, ebuf, sizeof ebuf) == -1) 1379 error("%s", ebuf); 1380 } else { 1381 (void)fprintf(stderr, "%s: ignoring option `-m %s' ", 1382 program_name, optarg); 1383 (void)fprintf(stderr, "(no libsmi support)\n"); 1384 } 1385 break; 1386 1387 case 'M': 1388 /* TCP-MD5 shared secret */ 1389 #ifndef HAVE_LIBCRYPTO 1390 warning("crypto code not compiled in"); 1391 #endif 1392 ndo->ndo_sigsecret = optarg; 1393 break; 1394 1395 case 'n': 1396 ++ndo->ndo_nflag; 1397 break; 1398 1399 case 'N': 1400 ++ndo->ndo_Nflag; 1401 break; 1402 1403 case 'O': 1404 Oflag = 0; 1405 break; 1406 1407 case 'p': 1408 ++pflag; 1409 break; 1410 1411 case 'q': 1412 ++ndo->ndo_qflag; 1413 ++ndo->ndo_suppress_default_print; 1414 break; 1415 1416 #ifdef HAVE_PCAP_SETDIRECTION 1417 case 'Q': 1418 if (ascii_strcasecmp(optarg, "in") == 0) 1419 Qflag = PCAP_D_IN; 1420 else if (ascii_strcasecmp(optarg, "out") == 0) 1421 Qflag = PCAP_D_OUT; 1422 else if (ascii_strcasecmp(optarg, "inout") == 0) 1423 Qflag = PCAP_D_INOUT; 1424 else 1425 error("unknown capture direction `%s'", optarg); 1426 break; 1427 #endif /* HAVE_PCAP_SETDIRECTION */ 1428 1429 case 'r': 1430 RFileName = optarg; 1431 break; 1432 1433 case 's': 1434 ndo->ndo_snaplen = strtol(optarg, &end, 0); 1435 if (optarg == end || *end != '\0' 1436 || ndo->ndo_snaplen < 0 || ndo->ndo_snaplen > MAXIMUM_SNAPLEN) 1437 error("invalid snaplen %s", optarg); 1438 else if (ndo->ndo_snaplen == 0) 1439 ndo->ndo_snaplen = MAXIMUM_SNAPLEN; 1440 break; 1441 1442 case 'S': 1443 ++ndo->ndo_Sflag; 1444 break; 1445 1446 case 't': 1447 ++ndo->ndo_tflag; 1448 break; 1449 1450 case 'T': 1451 if (ascii_strcasecmp(optarg, "vat") == 0) 1452 ndo->ndo_packettype = PT_VAT; 1453 else if (ascii_strcasecmp(optarg, "wb") == 0) 1454 ndo->ndo_packettype = PT_WB; 1455 else if (ascii_strcasecmp(optarg, "rpc") == 0) 1456 ndo->ndo_packettype = PT_RPC; 1457 else if (ascii_strcasecmp(optarg, "rtp") == 0) 1458 ndo->ndo_packettype = PT_RTP; 1459 else if (ascii_strcasecmp(optarg, "rtcp") == 0) 1460 ndo->ndo_packettype = PT_RTCP; 1461 else if (ascii_strcasecmp(optarg, "snmp") == 0) 1462 ndo->ndo_packettype = PT_SNMP; 1463 else if (ascii_strcasecmp(optarg, "cnfp") == 0) 1464 ndo->ndo_packettype = PT_CNFP; 1465 else if (ascii_strcasecmp(optarg, "tftp") == 0) 1466 ndo->ndo_packettype = PT_TFTP; 1467 else if (ascii_strcasecmp(optarg, "aodv") == 0) 1468 ndo->ndo_packettype = PT_AODV; 1469 else if (ascii_strcasecmp(optarg, "carp") == 0) 1470 ndo->ndo_packettype = PT_CARP; 1471 else if (ascii_strcasecmp(optarg, "radius") == 0) 1472 ndo->ndo_packettype = PT_RADIUS; 1473 else if (ascii_strcasecmp(optarg, "zmtp1") == 0) 1474 ndo->ndo_packettype = PT_ZMTP1; 1475 else if (ascii_strcasecmp(optarg, "vxlan") == 0) 1476 ndo->ndo_packettype = PT_VXLAN; 1477 else if (ascii_strcasecmp(optarg, "pgm") == 0) 1478 ndo->ndo_packettype = PT_PGM; 1479 else if (ascii_strcasecmp(optarg, "pgm_zmtp1") == 0) 1480 ndo->ndo_packettype = PT_PGM_ZMTP1; 1481 else if (ascii_strcasecmp(optarg, "lmp") == 0) 1482 ndo->ndo_packettype = PT_LMP; 1483 else if (ascii_strcasecmp(optarg, "resp") == 0) 1484 ndo->ndo_packettype = PT_RESP; 1485 else 1486 error("unknown packet type `%s'", optarg); 1487 break; 1488 1489 case 'u': 1490 ++ndo->ndo_uflag; 1491 break; 1492 1493 #ifdef HAVE_PCAP_DUMP_FLUSH 1494 case 'U': 1495 ++Uflag; 1496 break; 1497 #endif 1498 1499 case 'v': 1500 ++ndo->ndo_vflag; 1501 break; 1502 1503 case 'V': 1504 VFileName = optarg; 1505 break; 1506 1507 case 'w': 1508 WFileName = optarg; 1509 break; 1510 1511 case 'W': 1512 Wflag = atoi(optarg); 1513 if (Wflag <= 0) 1514 error("invalid number of output files %s", optarg); 1515 WflagChars = getWflagChars(Wflag); 1516 break; 1517 1518 case 'x': 1519 ++ndo->ndo_xflag; 1520 ++ndo->ndo_suppress_default_print; 1521 break; 1522 1523 case 'X': 1524 ++ndo->ndo_Xflag; 1525 ++ndo->ndo_suppress_default_print; 1526 break; 1527 1528 case 'y': 1529 yflag_dlt_name = optarg; 1530 yflag_dlt = 1531 pcap_datalink_name_to_val(yflag_dlt_name); 1532 if (yflag_dlt < 0) 1533 error("invalid data link type %s", yflag_dlt_name); 1534 break; 1535 1536 #ifdef HAVE_PCAP_SET_PARSER_DEBUG 1537 case 'Y': 1538 { 1539 /* Undocumented flag */ 1540 pcap_set_parser_debug(1); 1541 } 1542 break; 1543 #endif 1544 case 'z': 1545 zflag = optarg; 1546 break; 1547 1548 case 'Z': 1549 username = optarg; 1550 break; 1551 1552 case '#': 1553 ndo->ndo_packet_number = 1; 1554 break; 1555 1556 case OPTION_VERSION: 1557 print_version(); 1558 exit_tcpdump(0); 1559 break; 1560 1561 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION 1562 case OPTION_TSTAMP_PRECISION: 1563 ndo->ndo_tstamp_precision = tstamp_precision_from_string(optarg); 1564 if (ndo->ndo_tstamp_precision < 0) 1565 error("unsupported time stamp precision"); 1566 break; 1567 #endif 1568 1569 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE 1570 case OPTION_IMMEDIATE_MODE: 1571 immediate_mode = 1; 1572 break; 1573 #endif 1574 1575 default: 1576 print_usage(); 1577 exit_tcpdump(1); 1578 /* NOTREACHED */ 1579 } 1580 1581 #ifdef HAVE_PCAP_FINDALLDEVS 1582 if (Dflag) 1583 show_devices_and_exit(); 1584 #endif 1585 1586 switch (ndo->ndo_tflag) { 1587 1588 case 0: /* Default */ 1589 case 4: /* Default + Date*/ 1590 timezone_offset = gmt2local(0); 1591 break; 1592 1593 case 1: /* No time stamp */ 1594 case 2: /* Unix timeval style */ 1595 case 3: /* Microseconds since previous packet */ 1596 case 5: /* Microseconds since first packet */ 1597 break; 1598 1599 default: /* Not supported */ 1600 error("only -t, -tt, -ttt, -tttt and -ttttt are supported"); 1601 break; 1602 } 1603 1604 if (ndo->ndo_fflag != 0 && (VFileName != NULL || RFileName != NULL)) 1605 error("-f can not be used with -V or -r"); 1606 1607 if (VFileName != NULL && RFileName != NULL) 1608 error("-V and -r are mutually exclusive."); 1609 1610 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE 1611 /* 1612 * If we're printing dissected packets to the standard output 1613 * rather than saving raw packets to a file, and the standard 1614 * output is a terminal, use immediate mode, as the user's 1615 * probably expecting to see packets pop up immediately. 1616 */ 1617 if (WFileName == NULL && isatty(1)) 1618 immediate_mode = 1; 1619 #endif 1620 1621 #ifdef WITH_CHROOT 1622 /* if run as root, prepare for chrooting */ 1623 if (getuid() == 0 || geteuid() == 0) { 1624 /* future extensibility for cmd-line arguments */ 1625 if (!chroot_dir) 1626 chroot_dir = WITH_CHROOT; 1627 } 1628 #endif 1629 1630 #ifdef WITH_USER 1631 /* if run as root, prepare for dropping root privileges */ 1632 if (getuid() == 0 || geteuid() == 0) { 1633 /* Run with '-Z root' to restore old behaviour */ 1634 if (!username) 1635 username = WITH_USER; 1636 } 1637 #endif 1638 1639 if (RFileName != NULL || VFileName != NULL) { 1640 /* 1641 * If RFileName is non-null, it's the pathname of a 1642 * savefile to read. If VFileName is non-null, it's 1643 * the pathname of a file containing a list of pathnames 1644 * (one per line) of savefiles to read. 1645 * 1646 * In either case, we're reading a savefile, not doing 1647 * a live capture. 1648 */ 1649 #ifndef _WIN32 1650 /* 1651 * We don't need network access, so relinquish any set-UID 1652 * or set-GID privileges we have (if any). 1653 * 1654 * We do *not* want set-UID privileges when opening a 1655 * trace file, as that might let the user read other 1656 * people's trace files (especially if we're set-UID 1657 * root). 1658 */ 1659 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 ) 1660 fprintf(stderr, "Warning: setgid/setuid failed !\n"); 1661 #endif /* _WIN32 */ 1662 if (VFileName != NULL) { 1663 if (VFileName[0] == '-' && VFileName[1] == '\0') 1664 VFile = stdin; 1665 else 1666 VFile = fopen(VFileName, "r"); 1667 1668 if (VFile == NULL) 1669 error("Unable to open file: %s\n", pcap_strerror(errno)); 1670 1671 ret = get_next_file(VFile, VFileLine); 1672 if (!ret) 1673 error("Nothing in %s\n", VFileName); 1674 RFileName = VFileLine; 1675 } 1676 1677 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION 1678 pd = pcap_open_offline_with_tstamp_precision(RFileName, 1679 ndo->ndo_tstamp_precision, ebuf); 1680 #else 1681 pd = pcap_open_offline(RFileName, ebuf); 1682 #endif 1683 1684 if (pd == NULL) 1685 error("%s", ebuf); 1686 #ifdef HAVE_CAPSICUM 1687 cap_rights_init(&rights, CAP_READ); 1688 if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 && 1689 errno != ENOSYS) { 1690 error("unable to limit pcap descriptor"); 1691 } 1692 #endif 1693 dlt = pcap_datalink(pd); 1694 dlt_name = pcap_datalink_val_to_name(dlt); 1695 if (dlt_name == NULL) { 1696 fprintf(stderr, "reading from file %s, link-type %u\n", 1697 RFileName, dlt); 1698 } else { 1699 fprintf(stderr, 1700 "reading from file %s, link-type %s (%s)\n", 1701 RFileName, dlt_name, 1702 pcap_datalink_val_to_description(dlt)); 1703 } 1704 } else { 1705 /* 1706 * We're doing a live capture. 1707 */ 1708 if (device == NULL) { 1709 /* 1710 * No interface was specified. Pick one. 1711 */ 1712 #ifdef HAVE_PCAP_FINDALLDEVS 1713 /* 1714 * Find the list of interfaces, and pick 1715 * the first interface. 1716 */ 1717 if (pcap_findalldevs(&devlist, ebuf) >= 0 && 1718 devlist != NULL) { 1719 device = strdup(devlist->name); 1720 pcap_freealldevs(devlist); 1721 } 1722 #else /* HAVE_PCAP_FINDALLDEVS */ 1723 /* 1724 * Use whatever interface pcap_lookupdev() 1725 * chooses. 1726 */ 1727 device = pcap_lookupdev(ebuf); 1728 #endif 1729 if (device == NULL) 1730 error("%s", ebuf); 1731 } 1732 1733 /* 1734 * Try to open the interface with the specified name. 1735 */ 1736 pd = open_interface(device, ndo, ebuf); 1737 if (pd == NULL) { 1738 /* 1739 * That failed. If we can get a list of 1740 * interfaces, and the interface name 1741 * is purely numeric, try to use it as 1742 * a 1-based index in the list of 1743 * interfaces. 1744 */ 1745 #ifdef HAVE_PCAP_FINDALLDEVS 1746 devnum = parse_interface_number(device); 1747 if (devnum == -1) { 1748 /* 1749 * It's not a number; just report 1750 * the open error and fail. 1751 */ 1752 error("%s", ebuf); 1753 } 1754 1755 /* 1756 * OK, it's a number; try to find the 1757 * interface with that index, and try 1758 * to open it. 1759 * 1760 * find_interface_by_number() exits if it 1761 * couldn't be found. 1762 */ 1763 device = find_interface_by_number(devnum); 1764 pd = open_interface(device, ndo, ebuf); 1765 if (pd == NULL) 1766 error("%s", ebuf); 1767 #else /* HAVE_PCAP_FINDALLDEVS */ 1768 /* 1769 * We can't get a list of interfaces; just 1770 * fail. 1771 */ 1772 error("%s", ebuf); 1773 #endif /* HAVE_PCAP_FINDALLDEVS */ 1774 } 1775 1776 /* 1777 * Let user own process after socket has been opened. 1778 */ 1779 #ifndef _WIN32 1780 if (setgid(getgid()) != 0 || setuid(getuid()) != 0) 1781 fprintf(stderr, "Warning: setgid/setuid failed !\n"); 1782 #endif /* _WIN32 */ 1783 #if !defined(HAVE_PCAP_CREATE) && defined(_WIN32) 1784 if(Bflag != 0) 1785 if(pcap_setbuff(pd, Bflag)==-1){ 1786 error("%s", pcap_geterr(pd)); 1787 } 1788 #endif /* !defined(HAVE_PCAP_CREATE) && defined(_WIN32) */ 1789 if (Lflag) 1790 show_dlts_and_exit(pd, device); 1791 if (yflag_dlt >= 0) { 1792 #ifdef HAVE_PCAP_SET_DATALINK 1793 if (pcap_set_datalink(pd, yflag_dlt) < 0) 1794 error("%s", pcap_geterr(pd)); 1795 #else 1796 /* 1797 * We don't actually support changing the 1798 * data link type, so we only let them 1799 * set it to what it already is. 1800 */ 1801 if (yflag_dlt != pcap_datalink(pd)) { 1802 error("%s is not one of the DLTs supported by this device\n", 1803 yflag_dlt_name); 1804 } 1805 #endif 1806 (void)fprintf(stderr, "%s: data link type %s\n", 1807 program_name, yflag_dlt_name); 1808 (void)fflush(stderr); 1809 } 1810 i = pcap_snapshot(pd); 1811 if (ndo->ndo_snaplen < i) { 1812 warning("snaplen raised from %d to %d", ndo->ndo_snaplen, i); 1813 ndo->ndo_snaplen = i; 1814 } 1815 if(ndo->ndo_fflag != 0) { 1816 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) { 1817 warning("foreign (-f) flag used but: %s", ebuf); 1818 } 1819 } 1820 1821 } 1822 if (infile) 1823 cmdbuf = read_infile(infile); 1824 else 1825 cmdbuf = copy_argv(&argv[optind]); 1826 1827 #ifdef HAVE_PCAP_SET_OPTIMIZER_DEBUG 1828 pcap_set_optimizer_debug(dflag); 1829 #endif 1830 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0) 1831 error("%s", pcap_geterr(pd)); 1832 if (dflag) { 1833 bpf_dump(&fcode, dflag); 1834 pcap_close(pd); 1835 free(cmdbuf); 1836 pcap_freecode(&fcode); 1837 exit_tcpdump(0); 1838 } 1839 1840 #ifdef HAVE_CASPER 1841 if (!ndo->ndo_nflag) 1842 capdns = capdns_setup(); 1843 #endif /* HAVE_CASPER */ 1844 1845 init_print(ndo, localnet, netmask, timezone_offset); 1846 1847 #ifndef _WIN32 1848 (void)setsignal(SIGPIPE, cleanup); 1849 (void)setsignal(SIGTERM, cleanup); 1850 (void)setsignal(SIGINT, cleanup); 1851 #endif /* _WIN32 */ 1852 #if defined(HAVE_FORK) || defined(HAVE_VFORK) 1853 (void)setsignal(SIGCHLD, child_cleanup); 1854 #endif 1855 /* Cooperate with nohup(1) */ 1856 #ifndef _WIN32 1857 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL) 1858 (void)setsignal(SIGHUP, oldhandler); 1859 #endif /* _WIN32 */ 1860 1861 #ifndef _WIN32 1862 /* 1863 * If a user name was specified with "-Z", attempt to switch to 1864 * that user's UID. This would probably be used with sudo, 1865 * to allow tcpdump to be run in a special restricted 1866 * account (if you just want to allow users to open capture 1867 * devices, and can't just give users that permission, 1868 * you'd make tcpdump set-UID or set-GID). 1869 * 1870 * Tcpdump doesn't necessarily write only to one savefile; 1871 * the general only way to allow a -Z instance to write to 1872 * savefiles as the user under whose UID it's run, rather 1873 * than as the user specified with -Z, would thus be to switch 1874 * to the original user ID before opening a capture file and 1875 * then switch back to the -Z user ID after opening the savefile. 1876 * Switching to the -Z user ID only after opening the first 1877 * savefile doesn't handle the general case. 1878 */ 1879 1880 if (getuid() == 0 || geteuid() == 0) { 1881 #ifdef HAVE_LIBCAP_NG 1882 /* Initialize capng */ 1883 capng_clear(CAPNG_SELECT_BOTH); 1884 if (username) { 1885 capng_updatev( 1886 CAPNG_ADD, 1887 CAPNG_PERMITTED | CAPNG_EFFECTIVE, 1888 CAP_SETUID, 1889 CAP_SETGID, 1890 -1); 1891 } 1892 if (chroot_dir) { 1893 capng_update( 1894 CAPNG_ADD, 1895 CAPNG_PERMITTED | CAPNG_EFFECTIVE, 1896 CAP_SYS_CHROOT 1897 ); 1898 } 1899 1900 if (WFileName) { 1901 capng_update( 1902 CAPNG_ADD, 1903 CAPNG_PERMITTED | CAPNG_EFFECTIVE, 1904 CAP_DAC_OVERRIDE 1905 ); 1906 } 1907 capng_apply(CAPNG_SELECT_BOTH); 1908 #endif /* HAVE_LIBCAP_NG */ 1909 if (username || chroot_dir) 1910 droproot(username, chroot_dir); 1911 1912 } 1913 #endif /* _WIN32 */ 1914 1915 if (pcap_setfilter(pd, &fcode) < 0) 1916 error("%s", pcap_geterr(pd)); 1917 #ifdef HAVE_CAPSICUM 1918 if (RFileName == NULL && VFileName == NULL && pcap_fileno(pd) != -1) { 1919 static const unsigned long cmds[] = { BIOCGSTATS, BIOCROTZBUF }; 1920 1921 /* 1922 * The various libpcap devices use a combination of 1923 * read (bpf), ioctl (bpf, netmap), poll (netmap) 1924 * so we add the relevant access rights. 1925 */ 1926 cap_rights_init(&rights, CAP_IOCTL, CAP_READ, CAP_EVENT); 1927 if (cap_rights_limit(pcap_fileno(pd), &rights) < 0 && 1928 errno != ENOSYS) { 1929 error("unable to limit pcap descriptor"); 1930 } 1931 if (cap_ioctls_limit(pcap_fileno(pd), cmds, 1932 sizeof(cmds) / sizeof(cmds[0])) < 0 && errno != ENOSYS) { 1933 error("unable to limit ioctls on pcap descriptor"); 1934 } 1935 } 1936 #endif 1937 if (WFileName) { 1938 pcap_dumper_t *p; 1939 /* Do not exceed the default PATH_MAX for files. */ 1940 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1); 1941 1942 if (dumpinfo.CurrentFileName == NULL) 1943 error("malloc of dumpinfo.CurrentFileName"); 1944 1945 /* We do not need numbering for dumpfiles if Cflag isn't set. */ 1946 if (Cflag != 0) 1947 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars); 1948 else 1949 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0); 1950 1951 p = pcap_dump_open(pd, dumpinfo.CurrentFileName); 1952 #ifdef HAVE_LIBCAP_NG 1953 /* Give up CAP_DAC_OVERRIDE capability. 1954 * Only allow it to be restored if the -C or -G flag have been 1955 * set since we may need to create more files later on. 1956 */ 1957 capng_update( 1958 CAPNG_DROP, 1959 (Cflag || Gflag ? 0 : CAPNG_PERMITTED) 1960 | CAPNG_EFFECTIVE, 1961 CAP_DAC_OVERRIDE 1962 ); 1963 capng_apply(CAPNG_SELECT_BOTH); 1964 #endif /* HAVE_LIBCAP_NG */ 1965 if (p == NULL) 1966 error("%s", pcap_geterr(pd)); 1967 #ifdef HAVE_CAPSICUM 1968 set_dumper_capsicum_rights(p); 1969 #endif 1970 if (Cflag != 0 || Gflag != 0) { 1971 #ifdef HAVE_CAPSICUM 1972 dumpinfo.WFileName = strdup(basename(WFileName)); 1973 if (dumpinfo.WFileName == NULL) { 1974 error("Unable to allocate memory for file %s", 1975 WFileName); 1976 } 1977 dumpinfo.dirfd = open(dirname(WFileName), 1978 O_DIRECTORY | O_RDONLY); 1979 if (dumpinfo.dirfd < 0) { 1980 error("unable to open directory %s", 1981 dirname(WFileName)); 1982 } 1983 cap_rights_init(&rights, CAP_CREATE, CAP_FCNTL, 1984 CAP_FTRUNCATE, CAP_LOOKUP, CAP_SEEK, CAP_WRITE); 1985 if (cap_rights_limit(dumpinfo.dirfd, &rights) < 0 && 1986 errno != ENOSYS) { 1987 error("unable to limit directory rights"); 1988 } 1989 if (cap_fcntls_limit(dumpinfo.dirfd, CAP_FCNTL_GETFL) < 0 && 1990 errno != ENOSYS) { 1991 error("unable to limit dump descriptor fcntls"); 1992 } 1993 #else /* !HAVE_CAPSICUM */ 1994 dumpinfo.WFileName = WFileName; 1995 #endif 1996 callback = dump_packet_and_trunc; 1997 dumpinfo.pd = pd; 1998 dumpinfo.p = p; 1999 pcap_userdata = (u_char *)&dumpinfo; 2000 } else { 2001 callback = dump_packet; 2002 pcap_userdata = (u_char *)p; 2003 } 2004 #ifdef HAVE_PCAP_DUMP_FLUSH 2005 if (Uflag) 2006 pcap_dump_flush(p); 2007 #endif 2008 } else { 2009 dlt = pcap_datalink(pd); 2010 ndo->ndo_if_printer = get_if_printer(ndo, dlt); 2011 callback = print_packet; 2012 pcap_userdata = (u_char *)ndo; 2013 } 2014 2015 #ifdef SIGNAL_REQ_INFO 2016 /* 2017 * We can't get statistics when reading from a file rather 2018 * than capturing from a device. 2019 */ 2020 if (RFileName == NULL) 2021 (void)setsignal(SIGNAL_REQ_INFO, requestinfo); 2022 #endif 2023 2024 if (ndo->ndo_vflag > 0 && WFileName) { 2025 /* 2026 * When capturing to a file, "-v" means tcpdump should, 2027 * every 10 seconds, "v"erbosely report the number of 2028 * packets captured. 2029 */ 2030 #ifdef USE_WIN32_MM_TIMER 2031 /* call verbose_stats_dump() each 1000 +/-100msec */ 2032 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC); 2033 setvbuf(stderr, NULL, _IONBF, 0); 2034 #elif defined(HAVE_ALARM) 2035 (void)setsignal(SIGALRM, verbose_stats_dump); 2036 alarm(1); 2037 #endif 2038 } 2039 2040 if (RFileName == NULL) { 2041 /* 2042 * Live capture (if -V was specified, we set RFileName 2043 * to a file from the -V file). Print a message to 2044 * the standard error on UN*X. 2045 */ 2046 if (!ndo->ndo_vflag && !WFileName) { 2047 (void)fprintf(stderr, 2048 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n", 2049 program_name); 2050 } else 2051 (void)fprintf(stderr, "%s: ", program_name); 2052 dlt = pcap_datalink(pd); 2053 dlt_name = pcap_datalink_val_to_name(dlt); 2054 if (dlt_name == NULL) { 2055 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n", 2056 device, dlt, ndo->ndo_snaplen); 2057 } else { 2058 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n", 2059 device, dlt_name, 2060 pcap_datalink_val_to_description(dlt), ndo->ndo_snaplen); 2061 } 2062 (void)fflush(stderr); 2063 } 2064 2065 #ifdef HAVE_CAPSICUM 2066 cansandbox = (VFileName == NULL && zflag == NULL); 2067 #ifdef HAVE_CASPER 2068 cansandbox = (cansandbox && (ndo->ndo_nflag || capdns != NULL)); 2069 #else 2070 cansandbox = (cansandbox && ndo->ndo_nflag); 2071 #endif /* HAVE_CASPER */ 2072 cansandbox = (cansandbox && (pcap_fileno(pd) != -1 || 2073 RFileName != NULL)); 2074 2075 if (cansandbox && cap_enter() < 0 && errno != ENOSYS) 2076 error("unable to enter the capability mode"); 2077 #endif /* HAVE_CAPSICUM */ 2078 2079 do { 2080 status = pcap_loop(pd, cnt, callback, pcap_userdata); 2081 if (WFileName == NULL) { 2082 /* 2083 * We're printing packets. Flush the printed output, 2084 * so it doesn't get intermingled with error output. 2085 */ 2086 if (status == -2) { 2087 /* 2088 * We got interrupted, so perhaps we didn't 2089 * manage to finish a line we were printing. 2090 * Print an extra newline, just in case. 2091 */ 2092 putchar('\n'); 2093 } 2094 (void)fflush(stdout); 2095 } 2096 if (status == -2) { 2097 /* 2098 * We got interrupted. If we are reading multiple 2099 * files (via -V) set these so that we stop. 2100 */ 2101 VFileName = NULL; 2102 ret = NULL; 2103 } 2104 if (status == -1) { 2105 /* 2106 * Error. Report it. 2107 */ 2108 (void)fprintf(stderr, "%s: pcap_loop: %s\n", 2109 program_name, pcap_geterr(pd)); 2110 } 2111 if (RFileName == NULL) { 2112 /* 2113 * We're doing a live capture. Report the capture 2114 * statistics. 2115 */ 2116 info(1); 2117 } 2118 pcap_close(pd); 2119 if (VFileName != NULL) { 2120 ret = get_next_file(VFile, VFileLine); 2121 if (ret) { 2122 int new_dlt; 2123 2124 RFileName = VFileLine; 2125 pd = pcap_open_offline(RFileName, ebuf); 2126 if (pd == NULL) 2127 error("%s", ebuf); 2128 #ifdef HAVE_CAPSICUM 2129 cap_rights_init(&rights, CAP_READ); 2130 if (cap_rights_limit(fileno(pcap_file(pd)), 2131 &rights) < 0 && errno != ENOSYS) { 2132 error("unable to limit pcap descriptor"); 2133 } 2134 #endif 2135 new_dlt = pcap_datalink(pd); 2136 if (new_dlt != dlt) { 2137 /* 2138 * The new file has a different 2139 * link-layer header type from the 2140 * previous one. 2141 */ 2142 if (WFileName != NULL) { 2143 /* 2144 * We're writing raw packets 2145 * that match the filter to 2146 * a pcap file. pcap files 2147 * don't support multiple 2148 * different link-layer 2149 * header types, so we fail 2150 * here. 2151 */ 2152 error("%s: new dlt does not match original", RFileName); 2153 } 2154 2155 /* 2156 * We're printing the decoded packets; 2157 * switch to the new DLT. 2158 * 2159 * To do that, we need to change 2160 * the printer, change the DLT name, 2161 * and recompile the filter with 2162 * the new DLT. 2163 */ 2164 dlt = new_dlt; 2165 ndo->ndo_if_printer = get_if_printer(ndo, dlt); 2166 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0) 2167 error("%s", pcap_geterr(pd)); 2168 } 2169 2170 /* 2171 * Set the filter on the new file. 2172 */ 2173 if (pcap_setfilter(pd, &fcode) < 0) 2174 error("%s", pcap_geterr(pd)); 2175 2176 /* 2177 * Report the new file. 2178 */ 2179 dlt_name = pcap_datalink_val_to_name(dlt); 2180 if (dlt_name == NULL) { 2181 fprintf(stderr, "reading from file %s, link-type %u\n", 2182 RFileName, dlt); 2183 } else { 2184 fprintf(stderr, 2185 "reading from file %s, link-type %s (%s)\n", 2186 RFileName, dlt_name, 2187 pcap_datalink_val_to_description(dlt)); 2188 } 2189 } 2190 } 2191 } 2192 while (ret != NULL); 2193 2194 free(cmdbuf); 2195 pcap_freecode(&fcode); 2196 exit_tcpdump(status == -1 ? 1 : 0); 2197 } 2198 2199 /* make a clean exit on interrupts */ 2200 static RETSIGTYPE 2201 cleanup(int signo _U_) 2202 { 2203 #ifdef USE_WIN32_MM_TIMER 2204 if (timer_id) 2205 timeKillEvent(timer_id); 2206 timer_id = 0; 2207 #elif defined(HAVE_ALARM) 2208 alarm(0); 2209 #endif 2210 2211 #ifdef HAVE_PCAP_BREAKLOOP 2212 /* 2213 * We have "pcap_breakloop()"; use it, so that we do as little 2214 * as possible in the signal handler (it's probably not safe 2215 * to do anything with standard I/O streams in a signal handler - 2216 * the ANSI C standard doesn't say it is). 2217 */ 2218 pcap_breakloop(pd); 2219 #else 2220 /* 2221 * We don't have "pcap_breakloop()"; this isn't safe, but 2222 * it's the best we can do. Print the summary if we're 2223 * not reading from a savefile - i.e., if we're doing a 2224 * live capture - and exit. 2225 */ 2226 if (pd != NULL && pcap_file(pd) == NULL) { 2227 /* 2228 * We got interrupted, so perhaps we didn't 2229 * manage to finish a line we were printing. 2230 * Print an extra newline, just in case. 2231 */ 2232 putchar('\n'); 2233 (void)fflush(stdout); 2234 info(1); 2235 } 2236 exit_tcpdump(0); 2237 #endif 2238 } 2239 2240 /* 2241 On windows, we do not use a fork, so we do not care less about 2242 waiting a child processes to die 2243 */ 2244 #if defined(HAVE_FORK) || defined(HAVE_VFORK) 2245 static RETSIGTYPE 2246 child_cleanup(int signo _U_) 2247 { 2248 wait(NULL); 2249 } 2250 #endif /* HAVE_FORK && HAVE_VFORK */ 2251 2252 static void 2253 info(register int verbose) 2254 { 2255 struct pcap_stat stats; 2256 2257 /* 2258 * Older versions of libpcap didn't set ps_ifdrop on some 2259 * platforms; initialize it to 0 to handle that. 2260 */ 2261 stats.ps_ifdrop = 0; 2262 if (pcap_stats(pd, &stats) < 0) { 2263 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd)); 2264 infoprint = 0; 2265 return; 2266 } 2267 2268 if (!verbose) 2269 fprintf(stderr, "%s: ", program_name); 2270 2271 (void)fprintf(stderr, "%u packet%s captured", packets_captured, 2272 PLURAL_SUFFIX(packets_captured)); 2273 if (!verbose) 2274 fputs(", ", stderr); 2275 else 2276 putc('\n', stderr); 2277 (void)fprintf(stderr, "%u packet%s received by filter", stats.ps_recv, 2278 PLURAL_SUFFIX(stats.ps_recv)); 2279 if (!verbose) 2280 fputs(", ", stderr); 2281 else 2282 putc('\n', stderr); 2283 (void)fprintf(stderr, "%u packet%s dropped by kernel", stats.ps_drop, 2284 PLURAL_SUFFIX(stats.ps_drop)); 2285 if (stats.ps_ifdrop != 0) { 2286 if (!verbose) 2287 fputs(", ", stderr); 2288 else 2289 putc('\n', stderr); 2290 (void)fprintf(stderr, "%u packet%s dropped by interface\n", 2291 stats.ps_ifdrop, PLURAL_SUFFIX(stats.ps_ifdrop)); 2292 } else 2293 putc('\n', stderr); 2294 infoprint = 0; 2295 } 2296 2297 #if defined(HAVE_FORK) || defined(HAVE_VFORK) 2298 #ifdef HAVE_FORK 2299 #define fork_subprocess() fork() 2300 #else 2301 #define fork_subprocess() vfork() 2302 #endif 2303 static void 2304 compress_savefile(const char *filename) 2305 { 2306 pid_t child; 2307 2308 child = fork_subprocess(); 2309 if (child == -1) { 2310 fprintf(stderr, 2311 "compress_savefile: fork failed: %s\n", 2312 pcap_strerror(errno)); 2313 return; 2314 } 2315 if (child != 0) { 2316 /* Parent process. */ 2317 return; 2318 } 2319 2320 /* 2321 * Child process. 2322 * Set to lowest priority so that this doesn't disturb the capture. 2323 */ 2324 #ifdef NZERO 2325 setpriority(PRIO_PROCESS, 0, NZERO - 1); 2326 #else 2327 setpriority(PRIO_PROCESS, 0, 19); 2328 #endif 2329 if (execlp(zflag, zflag, filename, (char *)NULL) == -1) 2330 fprintf(stderr, 2331 "compress_savefile: execlp(%s, %s) failed: %s\n", 2332 zflag, 2333 filename, 2334 pcap_strerror(errno)); 2335 #ifdef HAVE_FORK 2336 exit(1); 2337 #else 2338 _exit(1); 2339 #endif 2340 } 2341 #else /* HAVE_FORK && HAVE_VFORK */ 2342 static void 2343 compress_savefile(const char *filename) 2344 { 2345 fprintf(stderr, 2346 "compress_savefile failed. Functionality not implemented under your system\n"); 2347 } 2348 #endif /* HAVE_FORK && HAVE_VFORK */ 2349 2350 static void 2351 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) 2352 { 2353 struct dump_info *dump_info; 2354 2355 ++packets_captured; 2356 2357 ++infodelay; 2358 2359 dump_info = (struct dump_info *)user; 2360 2361 /* 2362 * XXX - this won't force the file to rotate on the specified time 2363 * boundary, but it will rotate on the first packet received after the 2364 * specified Gflag number of seconds. Note: if a Gflag time boundary 2365 * and a Cflag size boundary coincide, the time rotation will occur 2366 * first thereby cancelling the Cflag boundary (since the file should 2367 * be 0). 2368 */ 2369 if (Gflag != 0) { 2370 /* Check if it is time to rotate */ 2371 time_t t; 2372 2373 /* Get the current time */ 2374 if ((t = time(NULL)) == (time_t)-1) { 2375 error("dump_and_trunc_packet: can't get current_time: %s", 2376 pcap_strerror(errno)); 2377 } 2378 2379 2380 /* If the time is greater than the specified window, rotate */ 2381 if (t - Gflag_time >= Gflag) { 2382 #ifdef HAVE_CAPSICUM 2383 FILE *fp; 2384 int fd; 2385 #endif 2386 2387 /* Update the Gflag_time */ 2388 Gflag_time = t; 2389 /* Update Gflag_count */ 2390 Gflag_count++; 2391 /* 2392 * Close the current file and open a new one. 2393 */ 2394 pcap_dump_close(dump_info->p); 2395 2396 /* 2397 * Compress the file we just closed, if the user asked for it 2398 */ 2399 if (zflag != NULL) 2400 compress_savefile(dump_info->CurrentFileName); 2401 2402 /* 2403 * Check to see if we've exceeded the Wflag (when 2404 * not using Cflag). 2405 */ 2406 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) { 2407 (void)fprintf(stderr, "Maximum file limit reached: %d\n", 2408 Wflag); 2409 info(1); 2410 exit_tcpdump(0); 2411 /* NOTREACHED */ 2412 } 2413 if (dump_info->CurrentFileName != NULL) 2414 free(dump_info->CurrentFileName); 2415 /* Allocate space for max filename + \0. */ 2416 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1); 2417 if (dump_info->CurrentFileName == NULL) 2418 error("dump_packet_and_trunc: malloc"); 2419 /* 2420 * Gflag was set otherwise we wouldn't be here. Reset the count 2421 * so multiple files would end with 1,2,3 in the filename. 2422 * The counting is handled with the -C flow after this. 2423 */ 2424 Cflag_count = 0; 2425 2426 /* 2427 * This is always the first file in the Cflag 2428 * rotation: e.g. 0 2429 * We also don't need numbering if Cflag is not set. 2430 */ 2431 if (Cflag != 0) 2432 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 2433 WflagChars); 2434 else 2435 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0); 2436 2437 #ifdef HAVE_LIBCAP_NG 2438 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); 2439 capng_apply(CAPNG_SELECT_BOTH); 2440 #endif /* HAVE_LIBCAP_NG */ 2441 #ifdef HAVE_CAPSICUM 2442 fd = openat(dump_info->dirfd, 2443 dump_info->CurrentFileName, 2444 O_CREAT | O_WRONLY | O_TRUNC, 0644); 2445 if (fd < 0) { 2446 error("unable to open file %s", 2447 dump_info->CurrentFileName); 2448 } 2449 fp = fdopen(fd, "w"); 2450 if (fp == NULL) { 2451 error("unable to fdopen file %s", 2452 dump_info->CurrentFileName); 2453 } 2454 dump_info->p = pcap_dump_fopen(dump_info->pd, fp); 2455 #else /* !HAVE_CAPSICUM */ 2456 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName); 2457 #endif 2458 #ifdef HAVE_LIBCAP_NG 2459 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); 2460 capng_apply(CAPNG_SELECT_BOTH); 2461 #endif /* HAVE_LIBCAP_NG */ 2462 if (dump_info->p == NULL) 2463 error("%s", pcap_geterr(pd)); 2464 #ifdef HAVE_CAPSICUM 2465 set_dumper_capsicum_rights(dump_info->p); 2466 #endif 2467 } 2468 } 2469 2470 /* 2471 * XXX - this won't prevent capture files from getting 2472 * larger than Cflag - the last packet written to the 2473 * file could put it over Cflag. 2474 */ 2475 if (Cflag != 0) { 2476 long size = pcap_dump_ftell(dump_info->p); 2477 2478 if (size == -1) 2479 error("ftell fails on output file"); 2480 if (size > Cflag) { 2481 #ifdef HAVE_CAPSICUM 2482 FILE *fp; 2483 int fd; 2484 #endif 2485 2486 /* 2487 * Close the current file and open a new one. 2488 */ 2489 pcap_dump_close(dump_info->p); 2490 2491 /* 2492 * Compress the file we just closed, if the user 2493 * asked for it. 2494 */ 2495 if (zflag != NULL) 2496 compress_savefile(dump_info->CurrentFileName); 2497 2498 Cflag_count++; 2499 if (Wflag > 0) { 2500 if (Cflag_count >= Wflag) 2501 Cflag_count = 0; 2502 } 2503 if (dump_info->CurrentFileName != NULL) 2504 free(dump_info->CurrentFileName); 2505 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1); 2506 if (dump_info->CurrentFileName == NULL) 2507 error("dump_packet_and_trunc: malloc"); 2508 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars); 2509 #ifdef HAVE_LIBCAP_NG 2510 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); 2511 capng_apply(CAPNG_SELECT_BOTH); 2512 #endif /* HAVE_LIBCAP_NG */ 2513 #ifdef HAVE_CAPSICUM 2514 fd = openat(dump_info->dirfd, dump_info->CurrentFileName, 2515 O_CREAT | O_WRONLY | O_TRUNC, 0644); 2516 if (fd < 0) { 2517 error("unable to open file %s", 2518 dump_info->CurrentFileName); 2519 } 2520 fp = fdopen(fd, "w"); 2521 if (fp == NULL) { 2522 error("unable to fdopen file %s", 2523 dump_info->CurrentFileName); 2524 } 2525 dump_info->p = pcap_dump_fopen(dump_info->pd, fp); 2526 #else /* !HAVE_CAPSICUM */ 2527 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName); 2528 #endif 2529 #ifdef HAVE_LIBCAP_NG 2530 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE); 2531 capng_apply(CAPNG_SELECT_BOTH); 2532 #endif /* HAVE_LIBCAP_NG */ 2533 if (dump_info->p == NULL) 2534 error("%s", pcap_geterr(pd)); 2535 #ifdef HAVE_CAPSICUM 2536 set_dumper_capsicum_rights(dump_info->p); 2537 #endif 2538 } 2539 } 2540 2541 pcap_dump((u_char *)dump_info->p, h, sp); 2542 #ifdef HAVE_PCAP_DUMP_FLUSH 2543 if (Uflag) 2544 pcap_dump_flush(dump_info->p); 2545 #endif 2546 2547 --infodelay; 2548 if (infoprint) 2549 info(0); 2550 } 2551 2552 static void 2553 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) 2554 { 2555 ++packets_captured; 2556 2557 ++infodelay; 2558 2559 pcap_dump(user, h, sp); 2560 #ifdef HAVE_PCAP_DUMP_FLUSH 2561 if (Uflag) 2562 pcap_dump_flush((pcap_dumper_t *)user); 2563 #endif 2564 2565 --infodelay; 2566 if (infoprint) 2567 info(0); 2568 } 2569 2570 static void 2571 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp) 2572 { 2573 ++packets_captured; 2574 2575 ++infodelay; 2576 2577 pretty_print_packet((netdissect_options *)user, h, sp, packets_captured); 2578 2579 --infodelay; 2580 if (infoprint) 2581 info(0); 2582 } 2583 2584 #ifdef _WIN32 2585 /* 2586 * XXX - there should really be libpcap calls to get the version 2587 * number as a string (the string would be generated from #defines 2588 * at run time, so that it's not generated from string constants 2589 * in the library, as, on many UNIX systems, those constants would 2590 * be statically linked into the application executable image, and 2591 * would thus reflect the version of libpcap on the system on 2592 * which the application was *linked*, not the system on which it's 2593 * *running*. 2594 * 2595 * That routine should be documented, unlike the "version[]" 2596 * string, so that UNIX vendors providing their own libpcaps 2597 * don't omit it (as a couple of vendors have...). 2598 * 2599 * Packet.dll should perhaps also export a routine to return the 2600 * version number of the Packet.dll code, to supply the 2601 * "Wpcap_version" information on Windows. 2602 */ 2603 char WDversion[]="current-git.tcpdump.org"; 2604 #if !defined(HAVE_GENERATED_VERSION) 2605 char version[]="current-git.tcpdump.org"; 2606 #endif 2607 char pcap_version[]="current-git.tcpdump.org"; 2608 char Wpcap_version[]="3.1"; 2609 #endif 2610 2611 #ifdef SIGNAL_REQ_INFO 2612 RETSIGTYPE requestinfo(int signo _U_) 2613 { 2614 if (infodelay) 2615 ++infoprint; 2616 else 2617 info(0); 2618 } 2619 #endif 2620 2621 /* 2622 * Called once each second in verbose mode while dumping to file 2623 */ 2624 #ifdef USE_WIN32_MM_TIMER 2625 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_, 2626 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_) 2627 { 2628 if (infodelay == 0) 2629 fprintf(stderr, "Got %u\r", packets_captured); 2630 } 2631 #elif defined(HAVE_ALARM) 2632 static void verbose_stats_dump(int sig _U_) 2633 { 2634 if (infodelay == 0) 2635 fprintf(stderr, "Got %u\r", packets_captured); 2636 alarm(1); 2637 } 2638 #endif 2639 2640 USES_APPLE_DEPRECATED_API 2641 static void 2642 print_version(void) 2643 { 2644 extern char version[]; 2645 #ifndef HAVE_PCAP_LIB_VERSION 2646 #if defined(_WIN32) || defined(HAVE_PCAP_VERSION) 2647 extern char pcap_version[]; 2648 #else /* defined(_WIN32) || defined(HAVE_PCAP_VERSION) */ 2649 static char pcap_version[] = "unknown"; 2650 #endif /* defined(_WIN32) || defined(HAVE_PCAP_VERSION) */ 2651 #endif /* HAVE_PCAP_LIB_VERSION */ 2652 const char *smi_version_string; 2653 2654 #ifdef HAVE_PCAP_LIB_VERSION 2655 #ifdef _WIN32 2656 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version); 2657 #else /* _WIN32 */ 2658 (void)fprintf(stderr, "%s version %s\n", program_name, version); 2659 #endif /* _WIN32 */ 2660 (void)fprintf(stderr, "%s\n",pcap_lib_version()); 2661 #else /* HAVE_PCAP_LIB_VERSION */ 2662 #ifdef _WIN32 2663 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version); 2664 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version); 2665 #else /* _WIN32 */ 2666 (void)fprintf(stderr, "%s version %s\n", program_name, version); 2667 (void)fprintf(stderr, "libpcap version %s\n", pcap_version); 2668 #endif /* _WIN32 */ 2669 #endif /* HAVE_PCAP_LIB_VERSION */ 2670 2671 #if defined(HAVE_LIBCRYPTO) && defined(SSLEAY_VERSION) 2672 (void)fprintf (stderr, "%s\n", SSLeay_version(SSLEAY_VERSION)); 2673 #endif 2674 2675 smi_version_string = nd_smi_version_string(); 2676 if (smi_version_string != NULL) 2677 (void)fprintf (stderr, "SMI-library: %s\n", smi_version_string); 2678 2679 #if defined(__SANITIZE_ADDRESS__) 2680 (void)fprintf (stderr, "Compiled with AddressSanitizer/GCC.\n"); 2681 #elif defined(__has_feature) 2682 # if __has_feature(address_sanitizer) 2683 (void)fprintf (stderr, "Compiled with AddressSanitizer/CLang.\n"); 2684 # endif 2685 #endif /* __SANITIZE_ADDRESS__ or __has_feature */ 2686 } 2687 USES_APPLE_RST 2688 2689 static void 2690 print_usage(void) 2691 { 2692 print_version(); 2693 (void)fprintf(stderr, 2694 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqStu" U_FLAG "vxX#]" B_FLAG_USAGE " [ -c count ]\n", program_name); 2695 (void)fprintf(stderr, 2696 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n"); 2697 (void)fprintf(stderr, 2698 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ] [ --number ]\n"); 2699 #ifdef HAVE_PCAP_SETDIRECTION 2700 (void)fprintf(stderr, 2701 "\t\t[ -Q in|out|inout ]\n"); 2702 #endif 2703 (void)fprintf(stderr, 2704 "\t\t[ -r file ] [ -s snaplen ] "); 2705 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION 2706 (void)fprintf(stderr, "[ --time-stamp-precision precision ]\n"); 2707 (void)fprintf(stderr, 2708 "\t\t"); 2709 #endif 2710 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE 2711 (void)fprintf(stderr, "[ --immediate-mode ] "); 2712 #endif 2713 (void)fprintf(stderr, "[ -T type ] [ --version ] [ -V file ]\n"); 2714 (void)fprintf(stderr, 2715 "\t\t[ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z postrotate-command ]\n"); 2716 (void)fprintf(stderr, 2717 "\t\t[ -Z user ] [ expression ]\n"); 2718 } 2719 /* 2720 * Local Variables: 2721 * c-style: whitesmith 2722 * c-basic-offset: 8 2723 * End: 2724 */ 2725