| File: | src/usr.sbin/tcpdump/tcpdump.c |
| Warning: | line 288, column 4 Value stored to 'infile' is never read |
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| 1 | /* $OpenBSD: tcpdump.c,v 1.95 2020/12/04 11:36:13 mvs Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that: (1) source code distributions |
| 9 | * retain the above copyright notice and this paragraph in its entirety, (2) |
| 10 | * distributions including binary code include the above copyright notice and |
| 11 | * this paragraph in its entirety in the documentation or other materials |
| 12 | * provided with the distribution, and (3) all advertising materials mentioning |
| 13 | * features or use of this software display the following acknowledgement: |
| 14 | * ``This product includes software developed by the University of California, |
| 15 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| 16 | * the University nor the names of its contributors may be used to endorse |
| 17 | * or promote products derived from this software without specific prior |
| 18 | * written permission. |
| 19 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| 20 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| 21 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * tcpdump - monitor tcp/ip traffic on an ethernet. |
| 26 | * |
| 27 | * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory. |
| 28 | * Mercilessly hacked and occasionally improved since then via the |
| 29 | * combined efforts of Van, Steve McCanne and Craig Leres of LBL. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/types.h> |
| 33 | #include <sys/time.h> |
| 34 | #include <sys/ioctl.h> |
| 35 | #include <sys/wait.h> |
| 36 | |
| 37 | #include <netinet/in.h> |
| 38 | |
| 39 | #include <pcap.h> |
| 40 | #include <signal.h> |
| 41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
| 43 | #include <string.h> |
| 44 | #include <unistd.h> |
| 45 | #include <limits.h> |
| 46 | #include <ctype.h> |
| 47 | #include <err.h> |
| 48 | #include <errno(*__errno()).h> |
| 49 | |
| 50 | #include "interface.h" |
| 51 | #include "addrtoname.h" |
| 52 | #include "setsignal.h" |
| 53 | #include "gmt2local.h" |
| 54 | |
| 55 | #include <sys/socket.h> |
| 56 | #include <net/if.h> |
| 57 | #include <net/pfvar.h> |
| 58 | #include "pfctl.h" |
| 59 | #include "pfctl_parser.h" |
| 60 | #include "privsep.h" |
| 61 | |
| 62 | int Aflag; /* dump ascii */ |
| 63 | int aflag; /* translate network and broadcast addresses */ |
| 64 | int Bflag; /* BPF fildrop setting */ |
| 65 | int dflag; /* print filter code */ |
| 66 | int eflag; /* print ethernet header */ |
| 67 | int fflag; /* don't translate "foreign" IP address */ |
| 68 | int Iflag; /* include interface in output */ |
| 69 | int Lflag; /* List available link types */ |
| 70 | int nflag; /* leave addresses as numbers */ |
| 71 | int Nflag; /* remove domains from printed host names */ |
| 72 | int Oflag = 1; /* run filter code optimizer */ |
| 73 | int oflag; /* print passive OS fingerprints */ |
| 74 | int pflag; /* don't go promiscuous */ |
| 75 | int qflag; /* quick (shorter) output */ |
| 76 | int Sflag; /* print raw TCP sequence numbers */ |
| 77 | int tflag = 1; /* print packet arrival time */ |
| 78 | int vflag; /* verbose */ |
| 79 | int xflag; /* print packet in hex */ |
| 80 | int Xflag; /* print packet in emacs-hexl style */ |
| 81 | |
| 82 | int packettype; |
| 83 | |
| 84 | char *program_name; |
| 85 | char *device = NULL((void *)0); |
| 86 | |
| 87 | int32_t thiszone; /* seconds offset from gmt to local time */ |
| 88 | |
| 89 | extern volatile pid_t child_pid; |
| 90 | |
| 91 | /* Externs */ |
| 92 | extern void bpf_dump(struct bpf_program *, int); |
| 93 | extern int esp_init(char *); |
| 94 | |
| 95 | /* Forwards */ |
| 96 | void cleanup(int); |
| 97 | void gotchld(int); |
| 98 | extern __dead__attribute__((__noreturn__)) void usage(void); |
| 99 | |
| 100 | /* Length of saved portion of packet. */ |
| 101 | int snaplen = 0; |
| 102 | |
| 103 | struct printer { |
| 104 | pcap_handler f; |
| 105 | int type; |
| 106 | }; |
| 107 | |
| 108 | /* XXX needed if using old bpf.h */ |
| 109 | #ifndef DLT_ATM_RFC148311 |
| 110 | #define DLT_ATM_RFC148311 11 |
| 111 | #endif |
| 112 | |
| 113 | static struct printer printers[] = { |
| 114 | { ether_if_print, DLT_EN10MB1 }, |
| 115 | { ether_if_print, DLT_IEEE8026 }, |
| 116 | { sl_if_print, DLT_SLIP8 }, |
| 117 | { sl_bsdos_if_print, DLT_SLIP_BSDOS15 }, |
| 118 | { ppp_if_print, DLT_PPP9 }, |
| 119 | { ppp_hdlc_if_print, DLT_PPP_SERIAL50 }, |
| 120 | { fddi_if_print, DLT_FDDI10 }, |
| 121 | { null_if_print, DLT_NULL0 }, |
| 122 | { raw_if_print, DLT_RAW14 }, |
| 123 | { atm_if_print, DLT_ATM_RFC148311 }, |
| 124 | { loop_if_print, DLT_LOOP12 }, |
| 125 | { enc_if_print, DLT_ENC13 }, |
| 126 | { pflog_if_print, DLT_PFLOG117 }, |
| 127 | { pfsync_if_print, DLT_PFSYNC18 }, |
| 128 | { ppp_ether_if_print, DLT_PPP_ETHER51 }, |
| 129 | { ieee802_11_if_print, DLT_IEEE802_11105 }, |
| 130 | { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO127 }, |
| 131 | { ofp_if_print, DLT_OPENFLOW267 }, |
| 132 | { usbpcap_if_print, DLT_USBPCAP249 }, |
| 133 | { NULL((void *)0), 0 }, |
| 134 | }; |
| 135 | |
| 136 | static pcap_handler |
| 137 | lookup_printer(int type) |
| 138 | { |
| 139 | struct printer *p; |
| 140 | |
| 141 | for (p = printers; p->f; ++p) { |
| 142 | if (type == p->type) |
| 143 | return p->f; |
| 144 | } |
| 145 | |
| 146 | error("unknown data link type 0x%x", type); |
| 147 | /* NOTREACHED */ |
| 148 | } |
| 149 | |
| 150 | static int |
| 151 | init_pfosfp(void) |
| 152 | { |
| 153 | pf_osfp_initialize(); |
| 154 | if (pfctl_file_fingerprints(-1, |
| 155 | PF_OPT_QUIET0x00010|PF_OPT_NOACTION0x00008, PF_OSFP_FILE"/etc/pf.os") == 0) |
| 156 | return 1; |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | static pcap_t *pd; |
| 161 | |
| 162 | /* Multiple DLT support */ |
| 163 | void pcap_list_linktypes(pcap_t *); |
| 164 | void pcap_print_linktype(u_int); |
| 165 | |
| 166 | void |
| 167 | pcap_print_linktype(u_int dlt) |
| 168 | { |
| 169 | const char *name; |
| 170 | |
| 171 | if ((name = pcap_datalink_val_to_name(dlt)) != NULL((void *)0)) |
| 172 | fprintf(stderr(&__sF[2]), "%s\n", name); |
| 173 | else |
| 174 | fprintf(stderr(&__sF[2]), "<unknown: %u>\n", dlt); |
| 175 | } |
| 176 | |
| 177 | void |
| 178 | pcap_list_linktypes(pcap_t *p) |
| 179 | { |
| 180 | int fd = p->fd; |
| 181 | u_int n; |
| 182 | |
| 183 | #define MAXDLT100 100 |
| 184 | |
| 185 | u_int dltlist[MAXDLT100]; |
| 186 | struct bpf_dltlist dl = {MAXDLT100, dltlist}; |
| 187 | |
| 188 | if (fd < 0) |
| 189 | error("Invalid bpf descriptor"); |
| 190 | |
| 191 | if (ioctl(fd, BIOCGDLTLIST(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct bpf_dltlist) & 0x1fff) << 16) | ((('B')) << 8) | ((123))), &dl) == -1) |
| 192 | err(1, "BIOCGDLTLIST"); |
| 193 | |
| 194 | if (dl.bfl_len > MAXDLT100) |
| 195 | error("Invalid number of linktypes: %u", dl.bfl_len); |
| 196 | |
| 197 | fprintf(stderr(&__sF[2]), "%d link type%s supported:\n", dl.bfl_len, |
| 198 | dl.bfl_len == 1 ? "" : "s"); |
| 199 | |
| 200 | for (n = 0; n < dl.bfl_len; n++) { |
| 201 | fprintf(stderr(&__sF[2]), "\t"); |
| 202 | pcap_print_linktype(dltlist[n]); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | int |
| 207 | main(int argc, char **argv) |
| 208 | { |
| 209 | int cnt = -1, op, i; |
| 210 | bpf_u_int32 localnet, netmask; |
| 211 | char *cp, *infile = NULL((void *)0), *RFileName = NULL((void *)0); |
| 212 | char ebuf[PCAP_ERRBUF_SIZE256], *WFileName = NULL((void *)0); |
| 213 | pcap_handler printer; |
| 214 | struct bpf_program *fcode; |
| 215 | u_char *pcap_userdata; |
| 216 | u_int dirfilt = 0, dlt = (u_int) -1; |
| 217 | const char *errstr; |
| 218 | |
| 219 | if ((cp = strrchr(argv[0], '/')) != NULL((void *)0)) |
| 220 | program_name = cp + 1; |
| 221 | else |
| 222 | program_name = argv[0]; |
| 223 | |
| 224 | /* '-P' used internally, exec privileged portion */ |
| 225 | if (argc >= 2 && strcmp("-P", argv[1]) == 0) |
| 226 | priv_exec(argc, argv); |
| 227 | |
| 228 | if (priv_init(argc, argv)) |
| 229 | error("Failed to setup privsep"); |
| 230 | |
| 231 | /* state: STATE_INIT */ |
| 232 | |
| 233 | opterr = 0; |
| 234 | while ((op = getopt(argc, argv, |
| 235 | "AaB:c:D:deE:fF:i:IlLnNOopqr:s:StT:vw:xXy:")) != -1) |
| 236 | switch (op) { |
| 237 | |
| 238 | case 'A': |
| 239 | xflag = 1; |
| 240 | Aflag = 1; |
| 241 | break; |
| 242 | |
| 243 | case 'a': |
| 244 | aflag = 1; |
| 245 | break; |
| 246 | |
| 247 | case 'B': |
| 248 | if (strcasecmp(optarg, "pass") == 0) |
| 249 | Bflag = BPF_FILDROP_PASS0; |
| 250 | else if (strcasecmp(optarg, "capture") == 0) |
| 251 | Bflag = BPF_FILDROP_CAPTURE1; |
| 252 | else if (strcasecmp(optarg, "drop") == 0) |
| 253 | Bflag = BPF_FILDROP_DROP2; |
| 254 | else { |
| 255 | error("invalid BPF fildrop option: %s", |
| 256 | optarg); |
| 257 | } |
| 258 | break; |
| 259 | |
| 260 | case 'c': |
| 261 | cnt = strtonum(optarg, 1, INT_MAX2147483647, &errstr); |
| 262 | if (errstr) |
| 263 | error("invalid packet count %s: %s", |
| 264 | optarg, errstr); |
| 265 | break; |
| 266 | |
| 267 | case 'D': |
| 268 | if (strcasecmp(optarg, "in") == 0) |
| 269 | dirfilt = BPF_DIRECTION_OUT(1 << 1); |
| 270 | else if (strcasecmp(optarg, "out") == 0) |
| 271 | dirfilt = BPF_DIRECTION_IN(1 << 0); |
| 272 | else |
| 273 | error("invalid traffic direction %s", optarg); |
| 274 | break; |
| 275 | |
| 276 | case 'd': |
| 277 | ++dflag; |
| 278 | break; |
| 279 | case 'e': |
| 280 | eflag = 1; |
| 281 | break; |
| 282 | |
| 283 | case 'f': |
| 284 | fflag = 1; |
| 285 | break; |
| 286 | |
| 287 | case 'F': |
| 288 | infile = optarg; |
Value stored to 'infile' is never read | |
| 289 | break; |
| 290 | |
| 291 | case 'i': |
| 292 | device = optarg; |
| 293 | break; |
| 294 | |
| 295 | case 'I': |
| 296 | Iflag = 1; |
| 297 | break; |
| 298 | |
| 299 | case 'l': |
| 300 | setvbuf(stdout(&__sF[1]), NULL((void *)0), _IOLBF1, 0); |
| 301 | break; |
| 302 | case 'L': |
| 303 | Lflag = 1; |
| 304 | break; |
| 305 | case 'n': |
| 306 | nflag = 1; |
| 307 | break; |
| 308 | |
| 309 | case 'N': |
| 310 | Nflag = 1; |
| 311 | break; |
| 312 | |
| 313 | case 'O': |
| 314 | Oflag = 0; |
| 315 | break; |
| 316 | |
| 317 | case 'o': |
| 318 | oflag = 1; |
| 319 | break; |
| 320 | |
| 321 | case 'p': |
| 322 | pflag = 1; |
| 323 | break; |
| 324 | |
| 325 | case 'q': |
| 326 | qflag = 1; |
| 327 | break; |
| 328 | |
| 329 | case 'r': |
| 330 | RFileName = optarg; |
| 331 | break; |
| 332 | |
| 333 | case 's': |
| 334 | snaplen = strtonum(optarg, 1, INT_MAX2147483647, &errstr); |
| 335 | if (errstr) |
| 336 | error("invalid snaplen %s: %s", optarg, errstr); |
| 337 | break; |
| 338 | |
| 339 | case 'S': |
| 340 | Sflag = 1; |
| 341 | break; |
| 342 | |
| 343 | case 't': |
| 344 | --tflag; |
| 345 | break; |
| 346 | |
| 347 | case 'T': |
| 348 | if (strcasecmp(optarg, "vat") == 0) |
| 349 | packettype = PT_VAT1; |
| 350 | else if (strcasecmp(optarg, "wb") == 0) |
| 351 | packettype = PT_WB2; |
| 352 | else if (strcasecmp(optarg, "rpc") == 0) |
| 353 | packettype = PT_RPC3; |
| 354 | else if (strcasecmp(optarg, "rtp") == 0) |
| 355 | packettype = PT_RTP4; |
| 356 | else if (strcasecmp(optarg, "rtcp") == 0) |
| 357 | packettype = PT_RTCP5; |
| 358 | else if (strcasecmp(optarg, "cnfp") == 0) |
| 359 | packettype = PT_CNFP6; |
| 360 | else if (strcasecmp(optarg, "vrrp") == 0) |
| 361 | packettype = PT_VRRP7; |
| 362 | else if (strcasecmp(optarg, "tcp") == 0) |
| 363 | packettype = PT_TCP8; |
| 364 | else if (strcasecmp(optarg, "gre") == 0) |
| 365 | packettype = PT_GRE9; |
| 366 | else if (strcasecmp(optarg, "vxlan") == 0) |
| 367 | packettype = PT_VXLAN12; |
| 368 | else if (strcasecmp(optarg, "geneve") == 0) |
| 369 | packettype = PT_GENEVE15; |
| 370 | else if (strcasecmp(optarg, "erspan") == 0) |
| 371 | packettype = PT_ERSPAN13; |
| 372 | else if (strcasecmp(optarg, "mpls") == 0) |
| 373 | packettype = PT_MPLS10; |
| 374 | else if (strcasecmp(optarg, "tftp") == 0) |
| 375 | packettype = PT_TFTP11; |
| 376 | else if (strcasecmp(optarg, "wg") == 0) |
| 377 | packettype = PT_WIREGUARD14; |
| 378 | else if (strcasecmp(optarg, "sack") == 0) |
| 379 | /* |
| 380 | * kept for compatibility; DEFAULT_SNAPLEN |
| 381 | * used to be too short to capture SACK. |
| 382 | */ |
| 383 | ; |
| 384 | else |
| 385 | error("unknown packet type `%s'", optarg); |
| 386 | break; |
| 387 | |
| 388 | case 'v': |
| 389 | ++vflag; |
| 390 | break; |
| 391 | |
| 392 | case 'w': |
| 393 | WFileName = optarg; |
| 394 | break; |
| 395 | |
| 396 | case 'y': |
| 397 | i = pcap_datalink_name_to_val(optarg); |
| 398 | if (i < 0) |
| 399 | error("invalid data link type: %s", optarg); |
| 400 | dlt = (u_int)i; |
| 401 | break; |
| 402 | |
| 403 | case 'x': |
| 404 | xflag = 1; |
| 405 | break; |
| 406 | |
| 407 | case 'X': |
| 408 | Xflag = 1; |
| 409 | xflag = 1; |
| 410 | break; |
| 411 | |
| 412 | case 'E': |
| 413 | if (esp_init(optarg) < 0) |
| 414 | error("bad esp specification `%s'", optarg); |
| 415 | break; |
| 416 | |
| 417 | default: |
| 418 | usage(); |
| 419 | /* NOTREACHED */ |
| 420 | } |
| 421 | |
| 422 | if (snaplen == 0) { |
| 423 | switch (dlt) { |
| 424 | case DLT_IEEE802_11105: |
| 425 | snaplen = IEEE802_11_SNAPLEN(116 + 30); |
| 426 | break; |
| 427 | case DLT_IEEE802_11_RADIO127: |
| 428 | snaplen = IEEE802_11_RADIO_SNAPLEN((116 + 30) + 64); |
| 429 | break; |
| 430 | default: |
| 431 | snaplen = DEFAULT_SNAPLEN116; |
| 432 | break; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | if (aflag && nflag) |
| 437 | error("-a and -n options are incompatible"); |
| 438 | |
| 439 | if (RFileName != NULL((void *)0)) { |
| 440 | pd = priv_pcap_offline(RFileName, ebuf); |
| 441 | if (pd == NULL((void *)0)) |
| 442 | error("%s", ebuf); |
| 443 | /* state: STATE_BPF */ |
| 444 | localnet = 0; |
| 445 | netmask = 0; |
| 446 | if (fflag != 0) |
| 447 | error("-f and -r options are incompatible"); |
| 448 | } else { |
| 449 | if (device == NULL((void *)0)) { |
| 450 | device = pcap_lookupdev(ebuf); |
| 451 | if (device == NULL((void *)0)) |
| 452 | error("%s", ebuf); |
| 453 | } |
| 454 | pd = priv_pcap_live(device, snaplen, !pflag, 1000, ebuf, |
| 455 | dlt, dirfilt, Bflag); |
| 456 | if (pd == NULL((void *)0)) |
| 457 | error("%s", ebuf); |
| 458 | |
| 459 | /* state: STATE_BPF */ |
| 460 | if (pcap_lookupnet(device, &localnet, &netmask, ebuf)) { |
| 461 | if (fflag) |
| 462 | warning("%s", ebuf); |
| 463 | localnet = 0; |
| 464 | netmask = 0; |
| 465 | } |
| 466 | } |
| 467 | i = pcap_snapshot(pd); |
| 468 | if (snaplen < i) { |
| 469 | warning("snaplen raised from %d to %d", snaplen, i); |
| 470 | snaplen = i; |
| 471 | } |
| 472 | |
| 473 | if (Lflag) { |
| 474 | pcap_list_linktypes(pd); |
| 475 | exit(0); |
| 476 | } |
| 477 | |
| 478 | fcode = priv_pcap_setfilter(pd, Oflag, netmask); |
| 479 | /* state: STATE_FILTER */ |
| 480 | if (fcode == NULL((void *)0)) |
| 481 | error("%s", pcap_geterr(pd)); |
| 482 | if (dflag) { |
| 483 | bpf_dump(fcode, dflag); |
| 484 | exit(0); |
| 485 | } |
| 486 | if (oflag) |
| 487 | oflag = init_pfosfp(); |
| 488 | init_addrtoname(localnet, netmask); |
| 489 | |
| 490 | if (WFileName) { |
| 491 | pcap_dumper_t *p; |
| 492 | |
| 493 | p = priv_pcap_dump_open(pd, WFileName); |
| 494 | /* state: STATE_RUN */ |
| 495 | if (p == NULL((void *)0)) |
| 496 | error("%s", pcap_geterr(pd)); |
| 497 | { |
| 498 | FILE *fp = (FILE *)p; /* XXX touching pcap guts! */ |
| 499 | fflush(fp); |
| 500 | setvbuf(fp, NULL((void *)0), _IONBF2, 0); |
| 501 | } |
| 502 | printer = pcap_dump; |
| 503 | pcap_userdata = (u_char *)p; |
| 504 | } else { |
| 505 | printer = lookup_printer(pcap_datalink(pd)); |
| 506 | pcap_userdata = NULL((void *)0); |
| 507 | priv_init_done(); |
| 508 | /* state: STATE_RUN */ |
| 509 | } |
| 510 | if (RFileName == NULL((void *)0)) { |
| 511 | (void)fprintf(stderr(&__sF[2]), "%s: listening on %s, link-type ", |
| 512 | program_name, device); |
| 513 | pcap_print_linktype(pd->linktype); |
| 514 | (void)fflush(stderr(&__sF[2])); |
| 515 | } |
| 516 | |
| 517 | if (tflag > 0) |
| 518 | thiszone = gmt2local(0); |
| 519 | |
| 520 | if (pledge("stdio", NULL((void *)0)) == -1) |
| 521 | err(1, "pledge"); |
| 522 | |
| 523 | if (pcap_loop(pd, cnt, printer, pcap_userdata) < 0) { |
| 524 | (void)fprintf(stderr(&__sF[2]), "%s: pcap_loop: %s\n", |
| 525 | program_name, pcap_geterr(pd)); |
| 526 | exit(1); |
| 527 | } |
| 528 | pcap_close(pd); |
| 529 | exit(0); |
| 530 | } |
| 531 | |
| 532 | /* make a clean exit on interrupts */ |
| 533 | void |
| 534 | cleanup(int signo) |
| 535 | { |
| 536 | struct pcap_stat stat; |
| 537 | sigset_t allsigs; |
| 538 | |
| 539 | sigfillset(&allsigs); |
| 540 | sigprocmask(SIG_BLOCK1, &allsigs, NULL((void *)0)); |
| 541 | |
| 542 | /* Can't print the summary if reading from a savefile */ |
| 543 | dprintf(STDERR_FILENO2, "\n"); |
| 544 | if (pd != NULL((void *)0) && pcap_file(pd) == NULL((void *)0)) { |
| 545 | if (priv_pcap_stats(&stat) < 0) { |
| 546 | dprintf(STDERR_FILENO2, |
| 547 | "pcap_stats: %s\n", pcap_geterr(pd)); |
| 548 | } else { |
| 549 | dprintf(STDERR_FILENO2, |
| 550 | "%u packets received by filter\n", stat.ps_recv); |
| 551 | dprintf(STDERR_FILENO2, |
| 552 | "%u packets dropped by kernel\n", stat.ps_drop); |
| 553 | } |
| 554 | } |
| 555 | _exit(0); |
| 556 | } |
| 557 | |
| 558 | void |
| 559 | gotchld(int signo) |
| 560 | { |
| 561 | pid_t pid; |
| 562 | int status; |
| 563 | int save_err = errno(*__errno()); |
| 564 | |
| 565 | do { |
| 566 | pid = waitpid(child_pid, &status, WNOHANG1); |
| 567 | if (pid > 0 && (WIFEXITED(status)(((status) & 0177) == 0) || WIFSIGNALED(status)(((status) & 0177) != 0177 && ((status) & 0177 ) != 0))) |
| 568 | cleanup(0); |
| 569 | } while (pid == -1 && errno(*__errno()) == EINTR4); |
| 570 | |
| 571 | if (pid == -1) |
| 572 | _exit(1); |
| 573 | |
| 574 | errno(*__errno()) = save_err; |
| 575 | } |
| 576 | |
| 577 | /* dump the buffer in `emacs-hexl' style */ |
| 578 | void |
| 579 | default_print_hexl(const u_char *cp, unsigned int length) |
| 580 | { |
| 581 | unsigned int i, j, jm; |
| 582 | int c; |
| 583 | char ln[128], buf[128]; |
| 584 | |
| 585 | printf("\n"); |
| 586 | for (i = 0; i < length; i += 0x10) { |
| 587 | snprintf(ln, sizeof(ln), " %04x: ", (unsigned int)i); |
| 588 | jm = length - i; |
| 589 | jm = jm > 16 ? 16 : jm; |
| 590 | |
| 591 | for (j = 0; j < jm; j++) { |
| 592 | if ((j % 2) == 1) |
| 593 | snprintf(buf, sizeof(buf), "%02x ", |
| 594 | (unsigned int)cp[i+j]); |
| 595 | else |
| 596 | snprintf(buf, sizeof(buf), "%02x", |
| 597 | (unsigned int)cp[i+j]); |
| 598 | strlcat(ln, buf, sizeof ln); |
| 599 | } |
| 600 | for (; j < 16; j++) { |
| 601 | if ((j % 2) == 1) |
| 602 | snprintf(buf, sizeof buf, " "); |
| 603 | else |
| 604 | snprintf(buf, sizeof buf, " "); |
| 605 | strlcat(ln, buf, sizeof ln); |
| 606 | } |
| 607 | |
| 608 | strlcat(ln, " ", sizeof ln); |
| 609 | for (j = 0; j < jm; j++) { |
| 610 | c = cp[i+j]; |
| 611 | c = isprint(c) ? c : '.'; |
| 612 | buf[0] = c; |
| 613 | buf[1] = '\0'; |
| 614 | strlcat(ln, buf, sizeof ln); |
| 615 | } |
| 616 | printf("%s\n", ln); |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | /* dump the text from the buffer */ |
| 621 | void |
| 622 | default_print_ascii(const u_char *cp, unsigned int length) |
| 623 | { |
| 624 | int c, i; |
| 625 | |
| 626 | printf("\n"); |
| 627 | for (i = 0; i < length; i++) { |
| 628 | c = cp[i]; |
| 629 | if (isprint(c) || c == '\t' || c == '\n' || c == '\r') |
| 630 | putchar(c)(!__isthreaded ? __sputc(c, (&__sF[1])) : (putc)(c, (& __sF[1]))); |
| 631 | else |
| 632 | putchar('.')(!__isthreaded ? __sputc('.', (&__sF[1])) : (putc)('.', ( &__sF[1]))); |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | /* Like default_print() but data need not be aligned */ |
| 637 | void |
| 638 | default_print_unaligned(const u_char *cp, u_int length) |
| 639 | { |
| 640 | u_int i, s; |
| 641 | int nshorts; |
| 642 | |
| 643 | if (Xflag) { |
| 644 | /* dump the buffer in `emacs-hexl' style */ |
| 645 | default_print_hexl(cp, length); |
| 646 | } else if (Aflag) { |
| 647 | /* dump the text in the buffer */ |
| 648 | default_print_ascii(cp, length); |
| 649 | } else { |
| 650 | /* dump the buffer in old tcpdump style */ |
| 651 | nshorts = (u_int) length / sizeof(u_short); |
| 652 | i = 0; |
| 653 | while (--nshorts >= 0) { |
| 654 | if ((i++ % 8) == 0) |
| 655 | printf("\n\t\t\t"); |
| 656 | s = *cp++; |
| 657 | printf(" %02x%02x", s, *cp++); |
| 658 | } |
| 659 | if (length & 1) { |
| 660 | if ((i % 8) == 0) |
| 661 | printf("\n\t\t\t"); |
| 662 | printf(" %02x", *cp); |
| 663 | } |
| 664 | } |
| 665 | } |
| 666 | |
| 667 | void |
| 668 | default_print(const u_char *bp, u_int length) |
| 669 | { |
| 670 | const u_short *sp; |
| 671 | u_int i; |
| 672 | int nshorts; |
| 673 | |
| 674 | if (Xflag) { |
| 675 | /* dump the buffer in `emacs-hexl' style */ |
| 676 | default_print_hexl(bp, length); |
| 677 | } else if (Aflag) { |
| 678 | /* dump the text in the buffer */ |
| 679 | default_print_ascii(bp, length); |
| 680 | } else { |
| 681 | /* dump the buffer in old tcpdump style */ |
| 682 | if ((long)bp & 1) { |
| 683 | default_print_unaligned(bp, length); |
| 684 | return; |
| 685 | } |
| 686 | sp = (u_short *)bp; |
| 687 | nshorts = (u_int) length / sizeof(u_short); |
| 688 | i = 0; |
| 689 | while (--nshorts >= 0) { |
| 690 | if ((i++ % 8) == 0) |
| 691 | printf("\n\t\t\t"); |
| 692 | printf(" %04x", ntohs(*sp++)(__uint16_t)(__builtin_constant_p(*sp++) ? (__uint16_t)(((__uint16_t )(*sp++) & 0xffU) << 8 | ((__uint16_t)(*sp++) & 0xff00U) >> 8) : __swap16md(*sp++))); |
| 693 | } |
| 694 | if (length & 1) { |
| 695 | if ((i % 8) == 0) |
| 696 | printf("\n\t\t\t"); |
| 697 | printf(" %02x", *(u_char *)sp); |
| 698 | } |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | void |
| 703 | set_slave_signals(void) |
| 704 | { |
| 705 | setsignal(SIGTERM15, cleanup); |
| 706 | setsignal(SIGINT2, cleanup); |
| 707 | setsignal(SIGCHLD20, gotchld); |
| 708 | setsignal(SIGHUP1, cleanup); |
| 709 | } |
| 710 | |
| 711 | __dead__attribute__((__noreturn__)) void |
| 712 | usage(void) |
| 713 | { |
| 714 | (void)fprintf(stderr(&__sF[2]), |
| 715 | "Usage: %s [-AadefILlNnOopqStvXx] [-B fildrop] [-c count] [-D direction]\n", |
| 716 | program_name); |
| 717 | (void)fprintf(stderr(&__sF[2]), |
| 718 | "\t [-E [espalg:]espkey] [-F file] [-i interface] [-r file]\n"); |
| 719 | (void)fprintf(stderr(&__sF[2]), |
| 720 | "\t [-s snaplen] [-T type] [-w file] [-y datalinktype] [expression]\n"); |
| 721 | exit(1); |
| 722 | } |