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