ping.c revision 171135
1/* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Mike Muuss. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#if 0 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93"; 42#endif /* not lint */ 43#endif 44#include <sys/cdefs.h> 45__FBSDID("$FreeBSD: head/sbin/ping/ping.c 171135 2007-07-01 12:08:08Z gnn $"); 46 47/* 48 * P I N G . C 49 * 50 * Using the Internet Control Message Protocol (ICMP) "ECHO" facility, 51 * measure round-trip-delays and packet loss across network paths. 52 * 53 * Author - 54 * Mike Muuss 55 * U. S. Army Ballistic Research Laboratory 56 * December, 1983 57 * 58 * Status - 59 * Public Domain. Distribution Unlimited. 60 * Bugs - 61 * More statistics could always be gathered. 62 * This program has to run SUID to ROOT to access the ICMP socket. 63 */ 64 65#include <sys/param.h> /* NB: we rely on this for <sys/types.h> */ 66#include <sys/socket.h> 67#include <sys/sysctl.h> 68#include <sys/time.h> 69#include <sys/uio.h> 70 71#include <netinet/in.h> 72#include <netinet/in_systm.h> 73#include <netinet/ip.h> 74#include <netinet/ip_icmp.h> 75#include <netinet/ip_var.h> 76#include <arpa/inet.h> 77 78#ifdef IPSEC 79#include <netipsec/ipsec.h> 80#endif /*IPSEC*/ 81 82#include <ctype.h> 83#include <err.h> 84#include <errno.h> 85#include <math.h> 86#include <netdb.h> 87#include <signal.h> 88#include <stdio.h> 89#include <stdlib.h> 90#include <string.h> 91#include <sysexits.h> 92#include <unistd.h> 93 94#define INADDR_LEN ((int)sizeof(in_addr_t)) 95#define TIMEVAL_LEN ((int)sizeof(struct tv32)) 96#define MASK_LEN (ICMP_MASKLEN - ICMP_MINLEN) 97#define TS_LEN (ICMP_TSLEN - ICMP_MINLEN) 98#define DEFDATALEN 56 /* default data length */ 99#define FLOOD_BACKOFF 20000 /* usecs to back off if F_FLOOD mode */ 100 /* runs out of buffer space */ 101#define MAXIPLEN (sizeof(struct ip) + MAX_IPOPTLEN) 102#define MAXICMPLEN (ICMP_ADVLENMIN + MAX_IPOPTLEN) 103#define MAXWAIT 10000 /* max ms to wait for response */ 104#define MAXALARM (60 * 60) /* max seconds for alarm timeout */ 105#define MAXTOS 255 106 107#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */ 108#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */ 109#define SET(bit) (A(bit) |= B(bit)) 110#define CLR(bit) (A(bit) &= (~B(bit))) 111#define TST(bit) (A(bit) & B(bit)) 112 113struct tv32 { 114 int32_t tv32_sec; 115 int32_t tv32_usec; 116}; 117 118/* various options */ 119int options; 120#define F_FLOOD 0x0001 121#define F_INTERVAL 0x0002 122#define F_NUMERIC 0x0004 123#define F_PINGFILLED 0x0008 124#define F_QUIET 0x0010 125#define F_RROUTE 0x0020 126#define F_SO_DEBUG 0x0040 127#define F_SO_DONTROUTE 0x0080 128#define F_VERBOSE 0x0100 129#define F_QUIET2 0x0200 130#define F_NOLOOP 0x0400 131#define F_MTTL 0x0800 132#define F_MIF 0x1000 133#define F_AUDIBLE 0x2000 134#ifdef IPSEC 135#ifdef IPSEC_POLICY_IPSEC 136#define F_POLICY 0x4000 137#endif /*IPSEC_POLICY_IPSEC*/ 138#endif /*IPSEC*/ 139#define F_TTL 0x8000 140#define F_MISSED 0x10000 141#define F_ONCE 0x20000 142#define F_HDRINCL 0x40000 143#define F_MASK 0x80000 144#define F_TIME 0x100000 145#define F_SWEEP 0x200000 146#define F_WAITTIME 0x400000 147 148/* 149 * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum 150 * number of received sequence numbers we can keep track of. Change 128 151 * to 8192 for complete accuracy... 152 */ 153#define MAX_DUP_CHK (8 * 128) 154int mx_dup_ck = MAX_DUP_CHK; 155char rcvd_tbl[MAX_DUP_CHK / 8]; 156 157struct sockaddr_in whereto; /* who to ping */ 158int datalen = DEFDATALEN; 159int maxpayload; 160int s; /* socket file descriptor */ 161u_char outpackhdr[IP_MAXPACKET], *outpack; 162char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */ 163char BSPACE = '\b'; /* characters written for flood */ 164char DOT = '.'; 165char *hostname; 166char *shostname; 167int ident; /* process id to identify our packets */ 168int uid; /* cached uid for micro-optimization */ 169u_char icmp_type = ICMP_ECHO; 170u_char icmp_type_rsp = ICMP_ECHOREPLY; 171int phdr_len = 0; 172int send_len; 173 174/* counters */ 175long nmissedmax; /* max value of ntransmitted - nreceived - 1 */ 176long npackets; /* max packets to transmit */ 177long nreceived; /* # of packets we got back */ 178long nrepeats; /* number of duplicates */ 179long ntransmitted; /* sequence # for outbound packets = #sent */ 180long snpackets; /* max packets to transmit in one sweep */ 181long snreceived; /* # of packets we got back in this sweep */ 182long sntransmitted; /* # of packets we sent in this sweep */ 183int sweepmax; /* max value of payload in sweep */ 184int sweepmin = 0; /* start value of payload in sweep */ 185int sweepincr = 1; /* payload increment in sweep */ 186int interval = 1000; /* interval between packets, ms */ 187int waittime = MAXWAIT; /* timeout for each packet */ 188long nrcvtimeout = 0; /* # of packets we got back after waittime */ 189 190/* timing */ 191int timing; /* flag to do timing */ 192double tmin = 999999999.0; /* minimum round trip time */ 193double tmax = 0.0; /* maximum round trip time */ 194double tsum = 0.0; /* sum of all times, for doing average */ 195double tsumsq = 0.0; /* sum of all times squared, for std. dev. */ 196 197volatile sig_atomic_t finish_up; /* nonzero if we've been told to finish up */ 198volatile sig_atomic_t siginfo_p; 199 200static void fill(char *, char *); 201static u_short in_cksum(u_short *, int); 202static void check_status(void); 203static void finish(void) __dead2; 204static void pinger(void); 205static char *pr_addr(struct in_addr); 206static char *pr_ntime(n_time); 207static void pr_icmph(struct icmp *); 208static void pr_iph(struct ip *); 209static void pr_pack(char *, int, struct sockaddr_in *, struct timeval *); 210static void pr_retip(struct ip *); 211static void status(int); 212static void stopit(int); 213static void tvsub(struct timeval *, struct timeval *); 214static void usage(void) __dead2; 215 216int 217main(argc, argv) 218 int argc; 219 char *const *argv; 220{ 221 struct sockaddr_in from, sock_in; 222 struct in_addr ifaddr; 223 struct timeval last, intvl; 224 struct iovec iov; 225 struct ip *ip; 226 struct msghdr msg; 227 struct sigaction si_sa; 228 size_t sz; 229 u_char *datap, packet[IP_MAXPACKET] __aligned(4); 230 char *ep, *source, *target, *payload; 231 struct hostent *hp; 232#ifdef IPSEC_POLICY_IPSEC 233 char *policy_in, *policy_out; 234#endif 235 struct sockaddr_in *to; 236 double t; 237 u_long alarmtimeout, ultmp; 238 int almost_done, ch, df, hold, i, icmp_len, mib[4], preload, sockerrno, 239 tos, ttl; 240 char ctrl[CMSG_SPACE(sizeof(struct timeval))]; 241 char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN]; 242#ifdef IP_OPTIONS 243 char rspace[MAX_IPOPTLEN]; /* record route space */ 244#endif 245 unsigned char loop, mttl; 246 247 payload = source = NULL; 248#ifdef IPSEC_POLICY_IPSEC 249 policy_in = policy_out = NULL; 250#endif 251 252 /* 253 * Do the stuff that we need root priv's for *first*, and 254 * then drop our setuid bit. Save error reporting for 255 * after arg parsing. 256 */ 257 s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 258 sockerrno = errno; 259 260 setuid(getuid()); 261 uid = getuid(); 262 263 alarmtimeout = df = preload = tos = 0; 264 265 outpack = outpackhdr + sizeof(struct ip); 266 while ((ch = getopt(argc, argv, 267 "Aac:DdfG:g:h:I:i:Ll:M:m:nop:QqRrS:s:T:t:vW:z:" 268#ifdef IPSEC 269#ifdef IPSEC_POLICY_IPSEC 270 "P:" 271#endif /*IPSEC_POLICY_IPSEC*/ 272#endif /*IPSEC*/ 273 )) != -1) 274 { 275 switch(ch) { 276 case 'A': 277 options |= F_MISSED; 278 break; 279 case 'a': 280 options |= F_AUDIBLE; 281 break; 282 case 'c': 283 ultmp = strtoul(optarg, &ep, 0); 284 if (*ep || ep == optarg || ultmp > LONG_MAX || !ultmp) 285 errx(EX_USAGE, 286 "invalid count of packets to transmit: `%s'", 287 optarg); 288 npackets = ultmp; 289 break; 290 case 'D': 291 options |= F_HDRINCL; 292 df = 1; 293 break; 294 case 'd': 295 options |= F_SO_DEBUG; 296 break; 297 case 'f': 298 if (uid) { 299 errno = EPERM; 300 err(EX_NOPERM, "-f flag"); 301 } 302 options |= F_FLOOD; 303 setbuf(stdout, (char *)NULL); 304 break; 305 case 'G': /* Maximum packet size for ping sweep */ 306 ultmp = strtoul(optarg, &ep, 0); 307 if (*ep || ep == optarg) 308 errx(EX_USAGE, "invalid packet size: `%s'", 309 optarg); 310 if (uid != 0 && ultmp > DEFDATALEN) { 311 errno = EPERM; 312 err(EX_NOPERM, 313 "packet size too large: %lu > %u", 314 ultmp, DEFDATALEN); 315 } 316 options |= F_SWEEP; 317 sweepmax = ultmp; 318 break; 319 case 'g': /* Minimum packet size for ping sweep */ 320 ultmp = strtoul(optarg, &ep, 0); 321 if (*ep || ep == optarg) 322 errx(EX_USAGE, "invalid packet size: `%s'", 323 optarg); 324 if (uid != 0 && ultmp > DEFDATALEN) { 325 errno = EPERM; 326 err(EX_NOPERM, 327 "packet size too large: %lu > %u", 328 ultmp, DEFDATALEN); 329 } 330 options |= F_SWEEP; 331 sweepmin = ultmp; 332 break; 333 case 'h': /* Packet size increment for ping sweep */ 334 ultmp = strtoul(optarg, &ep, 0); 335 if (*ep || ep == optarg || ultmp < 1) 336 errx(EX_USAGE, "invalid increment size: `%s'", 337 optarg); 338 if (uid != 0 && ultmp > DEFDATALEN) { 339 errno = EPERM; 340 err(EX_NOPERM, 341 "packet size too large: %lu > %u", 342 ultmp, DEFDATALEN); 343 } 344 options |= F_SWEEP; 345 sweepincr = ultmp; 346 break; 347 case 'I': /* multicast interface */ 348 if (inet_aton(optarg, &ifaddr) == 0) 349 errx(EX_USAGE, 350 "invalid multicast interface: `%s'", 351 optarg); 352 options |= F_MIF; 353 break; 354 case 'i': /* wait between sending packets */ 355 t = strtod(optarg, &ep) * 1000.0; 356 if (*ep || ep == optarg || t > (double)INT_MAX) 357 errx(EX_USAGE, "invalid timing interval: `%s'", 358 optarg); 359 options |= F_INTERVAL; 360 interval = (int)t; 361 if (uid && interval < 1000) { 362 errno = EPERM; 363 err(EX_NOPERM, "-i interval too short"); 364 } 365 break; 366 case 'L': 367 options |= F_NOLOOP; 368 loop = 0; 369 break; 370 case 'l': 371 ultmp = strtoul(optarg, &ep, 0); 372 if (*ep || ep == optarg || ultmp > INT_MAX) 373 errx(EX_USAGE, 374 "invalid preload value: `%s'", optarg); 375 if (uid) { 376 errno = EPERM; 377 err(EX_NOPERM, "-l flag"); 378 } 379 preload = ultmp; 380 break; 381 case 'M': 382 switch(optarg[0]) { 383 case 'M': 384 case 'm': 385 options |= F_MASK; 386 break; 387 case 'T': 388 case 't': 389 options |= F_TIME; 390 break; 391 default: 392 errx(EX_USAGE, "invalid message: `%c'", optarg[0]); 393 break; 394 } 395 break; 396 case 'm': /* TTL */ 397 ultmp = strtoul(optarg, &ep, 0); 398 if (*ep || ep == optarg || ultmp > MAXTTL) 399 errx(EX_USAGE, "invalid TTL: `%s'", optarg); 400 ttl = ultmp; 401 options |= F_TTL; 402 break; 403 case 'n': 404 options |= F_NUMERIC; 405 break; 406 case 'o': 407 options |= F_ONCE; 408 break; 409#ifdef IPSEC 410#ifdef IPSEC_POLICY_IPSEC 411 case 'P': 412 options |= F_POLICY; 413 if (!strncmp("in", optarg, 2)) 414 policy_in = strdup(optarg); 415 else if (!strncmp("out", optarg, 3)) 416 policy_out = strdup(optarg); 417 else 418 errx(1, "invalid security policy"); 419 break; 420#endif /*IPSEC_POLICY_IPSEC*/ 421#endif /*IPSEC*/ 422 case 'p': /* fill buffer with user pattern */ 423 options |= F_PINGFILLED; 424 payload = optarg; 425 break; 426 case 'Q': 427 options |= F_QUIET2; 428 break; 429 case 'q': 430 options |= F_QUIET; 431 break; 432 case 'R': 433 options |= F_RROUTE; 434 break; 435 case 'r': 436 options |= F_SO_DONTROUTE; 437 break; 438 case 'S': 439 source = optarg; 440 break; 441 case 's': /* size of packet to send */ 442 ultmp = strtoul(optarg, &ep, 0); 443 if (*ep || ep == optarg) 444 errx(EX_USAGE, "invalid packet size: `%s'", 445 optarg); 446 if (uid != 0 && ultmp > DEFDATALEN) { 447 errno = EPERM; 448 err(EX_NOPERM, 449 "packet size too large: %lu > %u", 450 ultmp, DEFDATALEN); 451 } 452 datalen = ultmp; 453 break; 454 case 'T': /* multicast TTL */ 455 ultmp = strtoul(optarg, &ep, 0); 456 if (*ep || ep == optarg || ultmp > MAXTTL) 457 errx(EX_USAGE, "invalid multicast TTL: `%s'", 458 optarg); 459 mttl = ultmp; 460 options |= F_MTTL; 461 break; 462 case 't': 463 alarmtimeout = strtoul(optarg, &ep, 0); 464 if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX)) 465 errx(EX_USAGE, "invalid timeout: `%s'", 466 optarg); 467 if (alarmtimeout > MAXALARM) 468 errx(EX_USAGE, "invalid timeout: `%s' > %d", 469 optarg, MAXALARM); 470 alarm((int)alarmtimeout); 471 break; 472 case 'v': 473 options |= F_VERBOSE; 474 break; 475 case 'W': /* wait ms for answer */ 476 t = strtod(optarg, &ep); 477 if (*ep || ep == optarg || t > (double)INT_MAX) 478 errx(EX_USAGE, "invalid timing interval: `%s'", 479 optarg); 480 options |= F_WAITTIME; 481 waittime = (int)t; 482 break; 483 case 'z': 484 options |= F_HDRINCL; 485 ultmp = strtoul(optarg, &ep, 0); 486 if (*ep || ep == optarg || ultmp > MAXTOS) 487 errx(EX_USAGE, "invalid TOS: `%s'", optarg); 488 tos = ultmp; 489 break; 490 default: 491 usage(); 492 } 493 } 494 495 if (argc - optind != 1) 496 usage(); 497 target = argv[optind]; 498 499 switch (options & (F_MASK|F_TIME)) { 500 case 0: break; 501 case F_MASK: 502 icmp_type = ICMP_MASKREQ; 503 icmp_type_rsp = ICMP_MASKREPLY; 504 phdr_len = MASK_LEN; 505 if (!(options & F_QUIET)) 506 (void)printf("ICMP_MASKREQ\n"); 507 break; 508 case F_TIME: 509 icmp_type = ICMP_TSTAMP; 510 icmp_type_rsp = ICMP_TSTAMPREPLY; 511 phdr_len = TS_LEN; 512 if (!(options & F_QUIET)) 513 (void)printf("ICMP_TSTAMP\n"); 514 break; 515 default: 516 errx(EX_USAGE, "ICMP_TSTAMP and ICMP_MASKREQ are exclusive."); 517 break; 518 } 519 icmp_len = sizeof(struct ip) + ICMP_MINLEN + phdr_len; 520 if (options & F_RROUTE) 521 icmp_len += MAX_IPOPTLEN; 522 maxpayload = IP_MAXPACKET - icmp_len; 523 if (datalen > maxpayload) 524 errx(EX_USAGE, "packet size too large: %d > %d", datalen, 525 maxpayload); 526 send_len = icmp_len + datalen; 527 datap = &outpack[ICMP_MINLEN + phdr_len + TIMEVAL_LEN]; 528 if (options & F_PINGFILLED) { 529 fill((char *)datap, payload); 530 } 531 if (source) { 532 bzero((char *)&sock_in, sizeof(sock_in)); 533 sock_in.sin_family = AF_INET; 534 if (inet_aton(source, &sock_in.sin_addr) != 0) { 535 shostname = source; 536 } else { 537 hp = gethostbyname2(source, AF_INET); 538 if (!hp) 539 errx(EX_NOHOST, "cannot resolve %s: %s", 540 source, hstrerror(h_errno)); 541 542 sock_in.sin_len = sizeof sock_in; 543 if ((unsigned)hp->h_length > sizeof(sock_in.sin_addr) || 544 hp->h_length < 0) 545 errx(1, "gethostbyname2: illegal address"); 546 memcpy(&sock_in.sin_addr, hp->h_addr_list[0], 547 sizeof(sock_in.sin_addr)); 548 (void)strncpy(snamebuf, hp->h_name, 549 sizeof(snamebuf) - 1); 550 snamebuf[sizeof(snamebuf) - 1] = '\0'; 551 shostname = snamebuf; 552 } 553 if (bind(s, (struct sockaddr *)&sock_in, sizeof sock_in) == -1) 554 err(1, "bind"); 555 } 556 557 bzero(&whereto, sizeof(whereto)); 558 to = &whereto; 559 to->sin_family = AF_INET; 560 to->sin_len = sizeof *to; 561 if (inet_aton(target, &to->sin_addr) != 0) { 562 hostname = target; 563 } else { 564 hp = gethostbyname2(target, AF_INET); 565 if (!hp) 566 errx(EX_NOHOST, "cannot resolve %s: %s", 567 target, hstrerror(h_errno)); 568 569 if ((unsigned)hp->h_length > sizeof(to->sin_addr)) 570 errx(1, "gethostbyname2 returned an illegal address"); 571 memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr); 572 (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1); 573 hnamebuf[sizeof(hnamebuf) - 1] = '\0'; 574 hostname = hnamebuf; 575 } 576 577 if (options & F_FLOOD && options & F_INTERVAL) 578 errx(EX_USAGE, "-f and -i: incompatible options"); 579 580 if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr))) 581 errx(EX_USAGE, 582 "-f flag cannot be used with multicast destination"); 583 if (options & (F_MIF | F_NOLOOP | F_MTTL) 584 && !IN_MULTICAST(ntohl(to->sin_addr.s_addr))) 585 errx(EX_USAGE, 586 "-I, -L, -T flags cannot be used with unicast destination"); 587 588 if (datalen >= TIMEVAL_LEN) /* can we time transfer */ 589 timing = 1; 590 591 if (!(options & F_PINGFILLED)) 592 for (i = TIMEVAL_LEN; i < datalen; ++i) 593 *datap++ = i; 594 595 ident = getpid() & 0xFFFF; 596 597 if (s < 0) { 598 errno = sockerrno; 599 err(EX_OSERR, "socket"); 600 } 601 hold = 1; 602 if (options & F_SO_DEBUG) 603 (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&hold, 604 sizeof(hold)); 605 if (options & F_SO_DONTROUTE) 606 (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&hold, 607 sizeof(hold)); 608#ifdef IPSEC 609#ifdef IPSEC_POLICY_IPSEC 610 if (options & F_POLICY) { 611 char *buf; 612 if (policy_in != NULL) { 613 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 614 if (buf == NULL) 615 errx(EX_CONFIG, "%s", ipsec_strerror()); 616 if (setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY, 617 buf, ipsec_get_policylen(buf)) < 0) 618 err(EX_CONFIG, 619 "ipsec policy cannot be configured"); 620 free(buf); 621 } 622 623 if (policy_out != NULL) { 624 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 625 if (buf == NULL) 626 errx(EX_CONFIG, "%s", ipsec_strerror()); 627 if (setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY, 628 buf, ipsec_get_policylen(buf)) < 0) 629 err(EX_CONFIG, 630 "ipsec policy cannot be configured"); 631 free(buf); 632 } 633 } 634#endif /*IPSEC_POLICY_IPSEC*/ 635#endif /*IPSEC*/ 636 637 if (options & F_HDRINCL) { 638 ip = (struct ip*)outpackhdr; 639 if (!(options & (F_TTL | F_MTTL))) { 640 mib[0] = CTL_NET; 641 mib[1] = PF_INET; 642 mib[2] = IPPROTO_IP; 643 mib[3] = IPCTL_DEFTTL; 644 sz = sizeof(ttl); 645 if (sysctl(mib, 4, &ttl, &sz, NULL, 0) == -1) 646 err(1, "sysctl(net.inet.ip.ttl)"); 647 } 648 setsockopt(s, IPPROTO_IP, IP_HDRINCL, &hold, sizeof(hold)); 649 ip->ip_v = IPVERSION; 650 ip->ip_hl = sizeof(struct ip) >> 2; 651 ip->ip_tos = tos; 652 ip->ip_id = 0; 653 ip->ip_off = df ? IP_DF : 0; 654 ip->ip_ttl = ttl; 655 ip->ip_p = IPPROTO_ICMP; 656 ip->ip_src.s_addr = source ? sock_in.sin_addr.s_addr : INADDR_ANY; 657 ip->ip_dst = to->sin_addr; 658 } 659 /* record route option */ 660 if (options & F_RROUTE) { 661#ifdef IP_OPTIONS 662 bzero(rspace, sizeof(rspace)); 663 rspace[IPOPT_OPTVAL] = IPOPT_RR; 664 rspace[IPOPT_OLEN] = sizeof(rspace) - 1; 665 rspace[IPOPT_OFFSET] = IPOPT_MINOFF; 666 rspace[sizeof(rspace) - 1] = IPOPT_EOL; 667 if (setsockopt(s, IPPROTO_IP, IP_OPTIONS, rspace, 668 sizeof(rspace)) < 0) 669 err(EX_OSERR, "setsockopt IP_OPTIONS"); 670#else 671 errx(EX_UNAVAILABLE, 672 "record route not available in this implementation"); 673#endif /* IP_OPTIONS */ 674 } 675 676 if (options & F_TTL) { 677 if (setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, 678 sizeof(ttl)) < 0) { 679 err(EX_OSERR, "setsockopt IP_TTL"); 680 } 681 } 682 if (options & F_NOLOOP) { 683 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, 684 sizeof(loop)) < 0) { 685 err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP"); 686 } 687 } 688 if (options & F_MTTL) { 689 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &mttl, 690 sizeof(mttl)) < 0) { 691 err(EX_OSERR, "setsockopt IP_MULTICAST_TTL"); 692 } 693 } 694 if (options & F_MIF) { 695 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr, 696 sizeof(ifaddr)) < 0) { 697 err(EX_OSERR, "setsockopt IP_MULTICAST_IF"); 698 } 699 } 700#ifdef SO_TIMESTAMP 701 { int on = 1; 702 if (setsockopt(s, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)) < 0) 703 err(EX_OSERR, "setsockopt SO_TIMESTAMP"); 704 } 705#endif 706 if (sweepmax) { 707 if (sweepmin >= sweepmax) 708 errx(EX_USAGE, "Maximum packet size must be greater than the minimum packet size"); 709 710 if (datalen != DEFDATALEN) 711 errx(EX_USAGE, "Packet size and ping sweep are mutually exclusive"); 712 713 if (npackets > 0) { 714 snpackets = npackets; 715 npackets = 0; 716 } else 717 snpackets = 1; 718 datalen = sweepmin; 719 send_len = icmp_len + sweepmin; 720 } 721 if (options & F_SWEEP && !sweepmax) 722 errx(EX_USAGE, "Maximum sweep size must be specified"); 723 724 /* 725 * When pinging the broadcast address, you can get a lot of answers. 726 * Doing something so evil is useful if you are trying to stress the 727 * ethernet, or just want to fill the arp cache to get some stuff for 728 * /etc/ethers. But beware: RFC 1122 allows hosts to ignore broadcast 729 * or multicast pings if they wish. 730 */ 731 732 /* 733 * XXX receive buffer needs undetermined space for mbuf overhead 734 * as well. 735 */ 736 hold = IP_MAXPACKET + 128; 737 (void)setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&hold, 738 sizeof(hold)); 739 if (uid == 0) 740 (void)setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&hold, 741 sizeof(hold)); 742 743 if (to->sin_family == AF_INET) { 744 (void)printf("PING %s (%s)", hostname, 745 inet_ntoa(to->sin_addr)); 746 if (source) 747 (void)printf(" from %s", shostname); 748 if (sweepmax) 749 (void)printf(": (%d ... %d) data bytes\n", 750 sweepmin, sweepmax); 751 else 752 (void)printf(": %d data bytes\n", datalen); 753 754 } else { 755 if (sweepmax) 756 (void)printf("PING %s: (%d ... %d) data bytes\n", 757 hostname, sweepmin, sweepmax); 758 else 759 (void)printf("PING %s: %d data bytes\n", hostname, datalen); 760 } 761 762 /* 763 * Use sigaction() instead of signal() to get unambiguous semantics, 764 * in particular with SA_RESTART not set. 765 */ 766 767 sigemptyset(&si_sa.sa_mask); 768 si_sa.sa_flags = 0; 769 770 si_sa.sa_handler = stopit; 771 if (sigaction(SIGINT, &si_sa, 0) == -1) { 772 err(EX_OSERR, "sigaction SIGINT"); 773 } 774 775 si_sa.sa_handler = status; 776 if (sigaction(SIGINFO, &si_sa, 0) == -1) { 777 err(EX_OSERR, "sigaction"); 778 } 779 780 if (alarmtimeout > 0) { 781 si_sa.sa_handler = stopit; 782 if (sigaction(SIGALRM, &si_sa, 0) == -1) 783 err(EX_OSERR, "sigaction SIGALRM"); 784 } 785 786 bzero(&msg, sizeof(msg)); 787 msg.msg_name = (caddr_t)&from; 788 msg.msg_iov = &iov; 789 msg.msg_iovlen = 1; 790#ifdef SO_TIMESTAMP 791 msg.msg_control = (caddr_t)ctrl; 792#endif 793 iov.iov_base = packet; 794 iov.iov_len = IP_MAXPACKET; 795 796 if (preload == 0) 797 pinger(); /* send the first ping */ 798 else { 799 if (npackets != 0 && preload > npackets) 800 preload = npackets; 801 while (preload--) /* fire off them quickies */ 802 pinger(); 803 } 804 (void)gettimeofday(&last, NULL); 805 806 if (options & F_FLOOD) { 807 intvl.tv_sec = 0; 808 intvl.tv_usec = 10000; 809 } else { 810 intvl.tv_sec = interval / 1000; 811 intvl.tv_usec = interval % 1000 * 1000; 812 } 813 814 almost_done = 0; 815 while (!finish_up) { 816 struct timeval now, timeout; 817 fd_set rfds; 818 int cc, n; 819 820 check_status(); 821 if ((unsigned)s >= FD_SETSIZE) 822 errx(EX_OSERR, "descriptor too large"); 823 FD_ZERO(&rfds); 824 FD_SET(s, &rfds); 825 (void)gettimeofday(&now, NULL); 826 timeout.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec; 827 timeout.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec; 828 while (timeout.tv_usec < 0) { 829 timeout.tv_usec += 1000000; 830 timeout.tv_sec--; 831 } 832 while (timeout.tv_usec >= 1000000) { 833 timeout.tv_usec -= 1000000; 834 timeout.tv_sec++; 835 } 836 if (timeout.tv_sec < 0) 837 timeout.tv_sec = timeout.tv_usec = 0; 838 n = select(s + 1, &rfds, NULL, NULL, &timeout); 839 if (n < 0) 840 continue; /* Must be EINTR. */ 841 if (n == 1) { 842 struct timeval *tv = NULL; 843#ifdef SO_TIMESTAMP 844 struct cmsghdr *cmsg = (struct cmsghdr *)&ctrl; 845 846 msg.msg_controllen = sizeof(ctrl); 847#endif 848 msg.msg_namelen = sizeof(from); 849 if ((cc = recvmsg(s, &msg, 0)) < 0) { 850 if (errno == EINTR) 851 continue; 852 warn("recvmsg"); 853 continue; 854 } 855#ifdef SO_TIMESTAMP 856 if (cmsg->cmsg_level == SOL_SOCKET && 857 cmsg->cmsg_type == SCM_TIMESTAMP && 858 cmsg->cmsg_len == CMSG_LEN(sizeof *tv)) { 859 /* Copy to avoid alignment problems: */ 860 memcpy(&now, CMSG_DATA(cmsg), sizeof(now)); 861 tv = &now; 862 } 863#endif 864 if (tv == NULL) { 865 (void)gettimeofday(&now, NULL); 866 tv = &now; 867 } 868 pr_pack((char *)packet, cc, &from, tv); 869 if ((options & F_ONCE && nreceived) || 870 (npackets && nreceived >= npackets)) 871 break; 872 } 873 if (n == 0 || options & F_FLOOD) { 874 if (sweepmax && sntransmitted == snpackets) { 875 for (i = 0; i < sweepincr ; ++i) 876 *datap++ = i; 877 datalen += sweepincr; 878 if (datalen > sweepmax) 879 break; 880 send_len = icmp_len + datalen; 881 sntransmitted = 0; 882 } 883 if (!npackets || ntransmitted < npackets) 884 pinger(); 885 else { 886 if (almost_done) 887 break; 888 almost_done = 1; 889 intvl.tv_usec = 0; 890 if (nreceived) { 891 intvl.tv_sec = 2 * tmax / 1000; 892 if (!intvl.tv_sec) 893 intvl.tv_sec = 1; 894 } else { 895 intvl.tv_sec = waittime / 1000; 896 intvl.tv_usec = waittime % 1000 * 1000; 897 } 898 } 899 (void)gettimeofday(&last, NULL); 900 if (ntransmitted - nreceived - 1 > nmissedmax) { 901 nmissedmax = ntransmitted - nreceived - 1; 902 if (options & F_MISSED) 903 (void)write(STDOUT_FILENO, &BBELL, 1); 904 } 905 } 906 } 907 finish(); 908 /* NOTREACHED */ 909 exit(0); /* Make the compiler happy */ 910} 911 912/* 913 * stopit -- 914 * Set the global bit that causes the main loop to quit. 915 * Do NOT call finish() from here, since finish() does far too much 916 * to be called from a signal handler. 917 */ 918void 919stopit(sig) 920 int sig __unused; 921{ 922 923 /* 924 * When doing reverse DNS lookups, the finish_up flag might not 925 * be noticed for a while. Just exit if we get a second SIGINT. 926 */ 927 if (!(options & F_NUMERIC) && finish_up) 928 _exit(nreceived ? 0 : 2); 929 finish_up = 1; 930} 931 932/* 933 * pinger -- 934 * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet 935 * will be added on by the kernel. The ID field is our UNIX process ID, 936 * and the sequence number is an ascending integer. The first TIMEVAL_LEN 937 * bytes of the data portion are used to hold a UNIX "timeval" struct in 938 * host byte-order, to compute the round-trip time. 939 */ 940static void 941pinger(void) 942{ 943 struct timeval now; 944 struct tv32 tv32; 945 struct ip *ip; 946 struct icmp *icp; 947 int cc, i; 948 u_char *packet; 949 950 packet = outpack; 951 icp = (struct icmp *)outpack; 952 icp->icmp_type = icmp_type; 953 icp->icmp_code = 0; 954 icp->icmp_cksum = 0; 955 icp->icmp_seq = htons(ntransmitted); 956 icp->icmp_id = ident; /* ID */ 957 958 CLR(ntransmitted % mx_dup_ck); 959 960 if ((options & F_TIME) || timing) { 961 (void)gettimeofday(&now, NULL); 962 963 tv32.tv32_sec = htonl(now.tv_sec); 964 tv32.tv32_usec = htonl(now.tv_usec); 965 if (options & F_TIME) 966 icp->icmp_otime = htonl((now.tv_sec % (24*60*60)) 967 * 1000 + now.tv_usec / 1000); 968 if (timing) 969 bcopy((void *)&tv32, 970 (void *)&outpack[ICMP_MINLEN + phdr_len], 971 sizeof(tv32)); 972 } 973 974 cc = ICMP_MINLEN + phdr_len + datalen; 975 976 /* compute ICMP checksum here */ 977 icp->icmp_cksum = in_cksum((u_short *)icp, cc); 978 979 if (options & F_HDRINCL) { 980 cc += sizeof(struct ip); 981 ip = (struct ip *)outpackhdr; 982 ip->ip_len = cc; 983 ip->ip_sum = in_cksum((u_short *)outpackhdr, cc); 984 packet = outpackhdr; 985 } 986 i = sendto(s, (char *)packet, cc, 0, (struct sockaddr *)&whereto, 987 sizeof(whereto)); 988 989 if (i < 0 || i != cc) { 990 if (i < 0) { 991 if (options & F_FLOOD && errno == ENOBUFS) { 992 usleep(FLOOD_BACKOFF); 993 return; 994 } 995 warn("sendto"); 996 } else { 997 warn("%s: partial write: %d of %d bytes", 998 hostname, i, cc); 999 } 1000 } 1001 ntransmitted++; 1002 sntransmitted++; 1003 if (!(options & F_QUIET) && options & F_FLOOD) 1004 (void)write(STDOUT_FILENO, &DOT, 1); 1005} 1006 1007/* 1008 * pr_pack -- 1009 * Print out the packet, if it came from us. This logic is necessary 1010 * because ALL readers of the ICMP socket get a copy of ALL ICMP packets 1011 * which arrive ('tis only fair). This permits multiple copies of this 1012 * program to be run without having intermingled output (or statistics!). 1013 */ 1014static void 1015pr_pack(buf, cc, from, tv) 1016 char *buf; 1017 int cc; 1018 struct sockaddr_in *from; 1019 struct timeval *tv; 1020{ 1021 struct in_addr ina; 1022 u_char *cp, *dp; 1023 struct icmp *icp; 1024 struct ip *ip; 1025 const void *tp; 1026 double triptime; 1027 int dupflag, hlen, i, j, recv_len, seq; 1028 static int old_rrlen; 1029 static char old_rr[MAX_IPOPTLEN]; 1030 1031 /* Check the IP header */ 1032 ip = (struct ip *)buf; 1033 hlen = ip->ip_hl << 2; 1034 recv_len = cc; 1035 if (cc < hlen + ICMP_MINLEN) { 1036 if (options & F_VERBOSE) 1037 warn("packet too short (%d bytes) from %s", cc, 1038 inet_ntoa(from->sin_addr)); 1039 return; 1040 } 1041 1042 /* Now the ICMP part */ 1043 cc -= hlen; 1044 icp = (struct icmp *)(buf + hlen); 1045 if (icp->icmp_type == icmp_type_rsp) { 1046 if (icp->icmp_id != ident) 1047 return; /* 'Twas not our ECHO */ 1048 ++nreceived; 1049 triptime = 0.0; 1050 if (timing) { 1051 struct timeval tv1; 1052 struct tv32 tv32; 1053#ifndef icmp_data 1054 tp = &icp->icmp_ip; 1055#else 1056 tp = icp->icmp_data; 1057#endif 1058 tp = (const char *)tp + phdr_len; 1059 1060 if (cc - ICMP_MINLEN - phdr_len >= sizeof(tv1)) { 1061 /* Copy to avoid alignment problems: */ 1062 memcpy(&tv32, tp, sizeof(tv32)); 1063 tv1.tv_sec = ntohl(tv32.tv32_sec); 1064 tv1.tv_usec = ntohl(tv32.tv32_usec); 1065 tvsub(tv, &tv1); 1066 triptime = ((double)tv->tv_sec) * 1000.0 + 1067 ((double)tv->tv_usec) / 1000.0; 1068 tsum += triptime; 1069 tsumsq += triptime * triptime; 1070 if (triptime < tmin) 1071 tmin = triptime; 1072 if (triptime > tmax) 1073 tmax = triptime; 1074 } else 1075 timing = 0; 1076 } 1077 1078 seq = ntohs(icp->icmp_seq); 1079 1080 if (TST(seq % mx_dup_ck)) { 1081 ++nrepeats; 1082 --nreceived; 1083 dupflag = 1; 1084 } else { 1085 SET(seq % mx_dup_ck); 1086 dupflag = 0; 1087 } 1088 1089 if (options & F_QUIET) 1090 return; 1091 1092 if (options & F_WAITTIME && triptime > waittime) { 1093 ++nrcvtimeout; 1094 return; 1095 } 1096 1097 if (options & F_FLOOD) 1098 (void)write(STDOUT_FILENO, &BSPACE, 1); 1099 else { 1100 (void)printf("%d bytes from %s: icmp_seq=%u", cc, 1101 inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr), 1102 seq); 1103 (void)printf(" ttl=%d", ip->ip_ttl); 1104 if (timing) 1105 (void)printf(" time=%.3f ms", triptime); 1106 if (dupflag) 1107 (void)printf(" (DUP!)"); 1108 if (options & F_AUDIBLE) 1109 (void)write(STDOUT_FILENO, &BBELL, 1); 1110 if (options & F_MASK) { 1111 /* Just prentend this cast isn't ugly */ 1112 (void)printf(" mask=%s", 1113 pr_addr(*(struct in_addr *)&(icp->icmp_mask))); 1114 } 1115 if (options & F_TIME) { 1116 (void)printf(" tso=%s", pr_ntime(icp->icmp_otime)); 1117 (void)printf(" tsr=%s", pr_ntime(icp->icmp_rtime)); 1118 (void)printf(" tst=%s", pr_ntime(icp->icmp_ttime)); 1119 } 1120 if (recv_len != send_len) { 1121 (void)printf( 1122 "\nwrong total length %d instead of %d", 1123 recv_len, send_len); 1124 } 1125 /* check the data */ 1126 cp = (u_char*)&icp->icmp_data[phdr_len]; 1127 dp = &outpack[ICMP_MINLEN + phdr_len]; 1128 cc -= ICMP_MINLEN + phdr_len; 1129 i = 0; 1130 if (timing) { /* don't check variable timestamp */ 1131 cp += TIMEVAL_LEN; 1132 dp += TIMEVAL_LEN; 1133 cc -= TIMEVAL_LEN; 1134 i += TIMEVAL_LEN; 1135 } 1136 for (; i < datalen && cc > 0; ++i, ++cp, ++dp, --cc) { 1137 if (*cp != *dp) { 1138 (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x", 1139 i, *dp, *cp); 1140 (void)printf("\ncp:"); 1141 cp = (u_char*)&icp->icmp_data[0]; 1142 for (i = 0; i < datalen; ++i, ++cp) { 1143 if ((i % 16) == 8) 1144 (void)printf("\n\t"); 1145 (void)printf("%2x ", *cp); 1146 } 1147 (void)printf("\ndp:"); 1148 cp = &outpack[ICMP_MINLEN]; 1149 for (i = 0; i < datalen; ++i, ++cp) { 1150 if ((i % 16) == 8) 1151 (void)printf("\n\t"); 1152 (void)printf("%2x ", *cp); 1153 } 1154 break; 1155 } 1156 } 1157 } 1158 } else { 1159 /* 1160 * We've got something other than an ECHOREPLY. 1161 * See if it's a reply to something that we sent. 1162 * We can compare IP destination, protocol, 1163 * and ICMP type and ID. 1164 * 1165 * Only print all the error messages if we are running 1166 * as root to avoid leaking information not normally 1167 * available to those not running as root. 1168 */ 1169#ifndef icmp_data 1170 struct ip *oip = &icp->icmp_ip; 1171#else 1172 struct ip *oip = (struct ip *)icp->icmp_data; 1173#endif 1174 struct icmp *oicmp = (struct icmp *)(oip + 1); 1175 1176 if (((options & F_VERBOSE) && uid == 0) || 1177 (!(options & F_QUIET2) && 1178 (oip->ip_dst.s_addr == whereto.sin_addr.s_addr) && 1179 (oip->ip_p == IPPROTO_ICMP) && 1180 (oicmp->icmp_type == ICMP_ECHO) && 1181 (oicmp->icmp_id == ident))) { 1182 (void)printf("%d bytes from %s: ", cc, 1183 pr_addr(from->sin_addr)); 1184 pr_icmph(icp); 1185 } else 1186 return; 1187 } 1188 1189 /* Display any IP options */ 1190 cp = (u_char *)buf + sizeof(struct ip); 1191 1192 for (; hlen > (int)sizeof(struct ip); --hlen, ++cp) 1193 switch (*cp) { 1194 case IPOPT_EOL: 1195 hlen = 0; 1196 break; 1197 case IPOPT_LSRR: 1198 case IPOPT_SSRR: 1199 (void)printf(*cp == IPOPT_LSRR ? 1200 "\nLSRR: " : "\nSSRR: "); 1201 j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1; 1202 hlen -= 2; 1203 cp += 2; 1204 if (j >= INADDR_LEN && 1205 j <= hlen - (int)sizeof(struct ip)) { 1206 for (;;) { 1207 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1208 if (ina.s_addr == 0) 1209 (void)printf("\t0.0.0.0"); 1210 else 1211 (void)printf("\t%s", 1212 pr_addr(ina)); 1213 hlen -= INADDR_LEN; 1214 cp += INADDR_LEN - 1; 1215 j -= INADDR_LEN; 1216 if (j < INADDR_LEN) 1217 break; 1218 (void)putchar('\n'); 1219 } 1220 } else 1221 (void)printf("\t(truncated route)\n"); 1222 break; 1223 case IPOPT_RR: 1224 j = cp[IPOPT_OLEN]; /* get length */ 1225 i = cp[IPOPT_OFFSET]; /* and pointer */ 1226 hlen -= 2; 1227 cp += 2; 1228 if (i > j) 1229 i = j; 1230 i = i - IPOPT_MINOFF + 1; 1231 if (i < 0 || i > (hlen - (int)sizeof(struct ip))) { 1232 old_rrlen = 0; 1233 continue; 1234 } 1235 if (i == old_rrlen 1236 && !bcmp((char *)cp, old_rr, i) 1237 && !(options & F_FLOOD)) { 1238 (void)printf("\t(same route)"); 1239 hlen -= i; 1240 cp += i; 1241 break; 1242 } 1243 old_rrlen = i; 1244 bcopy((char *)cp, old_rr, i); 1245 (void)printf("\nRR: "); 1246 if (i >= INADDR_LEN && 1247 i <= hlen - (int)sizeof(struct ip)) { 1248 for (;;) { 1249 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1250 if (ina.s_addr == 0) 1251 (void)printf("\t0.0.0.0"); 1252 else 1253 (void)printf("\t%s", 1254 pr_addr(ina)); 1255 hlen -= INADDR_LEN; 1256 cp += INADDR_LEN - 1; 1257 i -= INADDR_LEN; 1258 if (i < INADDR_LEN) 1259 break; 1260 (void)putchar('\n'); 1261 } 1262 } else 1263 (void)printf("\t(truncated route)"); 1264 break; 1265 case IPOPT_NOP: 1266 (void)printf("\nNOP"); 1267 break; 1268 default: 1269 (void)printf("\nunknown option %x", *cp); 1270 break; 1271 } 1272 if (!(options & F_FLOOD)) { 1273 (void)putchar('\n'); 1274 (void)fflush(stdout); 1275 } 1276} 1277 1278/* 1279 * in_cksum -- 1280 * Checksum routine for Internet Protocol family headers (C Version) 1281 */ 1282u_short 1283in_cksum(addr, len) 1284 u_short *addr; 1285 int len; 1286{ 1287 int nleft, sum; 1288 u_short *w; 1289 union { 1290 u_short us; 1291 u_char uc[2]; 1292 } last; 1293 u_short answer; 1294 1295 nleft = len; 1296 sum = 0; 1297 w = addr; 1298 1299 /* 1300 * Our algorithm is simple, using a 32 bit accumulator (sum), we add 1301 * sequential 16 bit words to it, and at the end, fold back all the 1302 * carry bits from the top 16 bits into the lower 16 bits. 1303 */ 1304 while (nleft > 1) { 1305 sum += *w++; 1306 nleft -= 2; 1307 } 1308 1309 /* mop up an odd byte, if necessary */ 1310 if (nleft == 1) { 1311 last.uc[0] = *(u_char *)w; 1312 last.uc[1] = 0; 1313 sum += last.us; 1314 } 1315 1316 /* add back carry outs from top 16 bits to low 16 bits */ 1317 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ 1318 sum += (sum >> 16); /* add carry */ 1319 answer = ~sum; /* truncate to 16 bits */ 1320 return(answer); 1321} 1322 1323/* 1324 * tvsub -- 1325 * Subtract 2 timeval structs: out = out - in. Out is assumed to 1326 * be >= in. 1327 */ 1328static void 1329tvsub(out, in) 1330 struct timeval *out, *in; 1331{ 1332 1333 if ((out->tv_usec -= in->tv_usec) < 0) { 1334 --out->tv_sec; 1335 out->tv_usec += 1000000; 1336 } 1337 out->tv_sec -= in->tv_sec; 1338} 1339 1340/* 1341 * status -- 1342 * Print out statistics when SIGINFO is received. 1343 */ 1344 1345static void 1346status(sig) 1347 int sig __unused; 1348{ 1349 1350 siginfo_p = 1; 1351} 1352 1353static void 1354check_status() 1355{ 1356 1357 if (siginfo_p) { 1358 siginfo_p = 0; 1359 (void)fprintf(stderr, "\r%ld/%ld packets received (%.1f%%)", 1360 nreceived, ntransmitted, 1361 ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0); 1362 if (nreceived && timing) 1363 (void)fprintf(stderr, " %.3f min / %.3f avg / %.3f max", 1364 tmin, tsum / (nreceived + nrepeats), tmax); 1365 (void)fprintf(stderr, "\n"); 1366 } 1367} 1368 1369/* 1370 * finish -- 1371 * Print out statistics, and give up. 1372 */ 1373static void 1374finish() 1375{ 1376 1377 (void)signal(SIGINT, SIG_IGN); 1378 (void)signal(SIGALRM, SIG_IGN); 1379 (void)putchar('\n'); 1380 (void)fflush(stdout); 1381 (void)printf("--- %s ping statistics ---\n", hostname); 1382 (void)printf("%ld packets transmitted, ", ntransmitted); 1383 (void)printf("%ld packets received, ", nreceived); 1384 if (nrepeats) 1385 (void)printf("+%ld duplicates, ", nrepeats); 1386 if (ntransmitted) { 1387 if (nreceived > ntransmitted) 1388 (void)printf("-- somebody's printing up packets!"); 1389 else 1390 (void)printf("%.1f%% packet loss", 1391 ((ntransmitted - nreceived) * 100.0) / 1392 ntransmitted); 1393 } 1394 if (nrcvtimeout) 1395 (void)printf(", %ld packets out of wait time", nrcvtimeout); 1396 (void)putchar('\n'); 1397 if (nreceived && timing) { 1398 double n = nreceived + nrepeats; 1399 double avg = tsum / n; 1400 double vari = tsumsq / n - avg * avg; 1401 (void)printf( 1402 "round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n", 1403 tmin, avg, tmax, sqrt(vari)); 1404 } 1405 1406 if (nreceived) 1407 exit(0); 1408 else 1409 exit(2); 1410} 1411 1412#ifdef notdef 1413static char *ttab[] = { 1414 "Echo Reply", /* ip + seq + udata */ 1415 "Dest Unreachable", /* net, host, proto, port, frag, sr + IP */ 1416 "Source Quench", /* IP */ 1417 "Redirect", /* redirect type, gateway, + IP */ 1418 "Echo", 1419 "Time Exceeded", /* transit, frag reassem + IP */ 1420 "Parameter Problem", /* pointer + IP */ 1421 "Timestamp", /* id + seq + three timestamps */ 1422 "Timestamp Reply", /* " */ 1423 "Info Request", /* id + sq */ 1424 "Info Reply" /* " */ 1425}; 1426#endif 1427 1428/* 1429 * pr_icmph -- 1430 * Print a descriptive string about an ICMP header. 1431 */ 1432static void 1433pr_icmph(icp) 1434 struct icmp *icp; 1435{ 1436 1437 switch(icp->icmp_type) { 1438 case ICMP_ECHOREPLY: 1439 (void)printf("Echo Reply\n"); 1440 /* XXX ID + Seq + Data */ 1441 break; 1442 case ICMP_UNREACH: 1443 switch(icp->icmp_code) { 1444 case ICMP_UNREACH_NET: 1445 (void)printf("Destination Net Unreachable\n"); 1446 break; 1447 case ICMP_UNREACH_HOST: 1448 (void)printf("Destination Host Unreachable\n"); 1449 break; 1450 case ICMP_UNREACH_PROTOCOL: 1451 (void)printf("Destination Protocol Unreachable\n"); 1452 break; 1453 case ICMP_UNREACH_PORT: 1454 (void)printf("Destination Port Unreachable\n"); 1455 break; 1456 case ICMP_UNREACH_NEEDFRAG: 1457 (void)printf("frag needed and DF set (MTU %d)\n", 1458 ntohs(icp->icmp_nextmtu)); 1459 break; 1460 case ICMP_UNREACH_SRCFAIL: 1461 (void)printf("Source Route Failed\n"); 1462 break; 1463 case ICMP_UNREACH_FILTER_PROHIB: 1464 (void)printf("Communication prohibited by filter\n"); 1465 break; 1466 default: 1467 (void)printf("Dest Unreachable, Bad Code: %d\n", 1468 icp->icmp_code); 1469 break; 1470 } 1471 /* Print returned IP header information */ 1472#ifndef icmp_data 1473 pr_retip(&icp->icmp_ip); 1474#else 1475 pr_retip((struct ip *)icp->icmp_data); 1476#endif 1477 break; 1478 case ICMP_SOURCEQUENCH: 1479 (void)printf("Source Quench\n"); 1480#ifndef icmp_data 1481 pr_retip(&icp->icmp_ip); 1482#else 1483 pr_retip((struct ip *)icp->icmp_data); 1484#endif 1485 break; 1486 case ICMP_REDIRECT: 1487 switch(icp->icmp_code) { 1488 case ICMP_REDIRECT_NET: 1489 (void)printf("Redirect Network"); 1490 break; 1491 case ICMP_REDIRECT_HOST: 1492 (void)printf("Redirect Host"); 1493 break; 1494 case ICMP_REDIRECT_TOSNET: 1495 (void)printf("Redirect Type of Service and Network"); 1496 break; 1497 case ICMP_REDIRECT_TOSHOST: 1498 (void)printf("Redirect Type of Service and Host"); 1499 break; 1500 default: 1501 (void)printf("Redirect, Bad Code: %d", icp->icmp_code); 1502 break; 1503 } 1504 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr)); 1505#ifndef icmp_data 1506 pr_retip(&icp->icmp_ip); 1507#else 1508 pr_retip((struct ip *)icp->icmp_data); 1509#endif 1510 break; 1511 case ICMP_ECHO: 1512 (void)printf("Echo Request\n"); 1513 /* XXX ID + Seq + Data */ 1514 break; 1515 case ICMP_TIMXCEED: 1516 switch(icp->icmp_code) { 1517 case ICMP_TIMXCEED_INTRANS: 1518 (void)printf("Time to live exceeded\n"); 1519 break; 1520 case ICMP_TIMXCEED_REASS: 1521 (void)printf("Frag reassembly time exceeded\n"); 1522 break; 1523 default: 1524 (void)printf("Time exceeded, Bad Code: %d\n", 1525 icp->icmp_code); 1526 break; 1527 } 1528#ifndef icmp_data 1529 pr_retip(&icp->icmp_ip); 1530#else 1531 pr_retip((struct ip *)icp->icmp_data); 1532#endif 1533 break; 1534 case ICMP_PARAMPROB: 1535 (void)printf("Parameter problem: pointer = 0x%02x\n", 1536 icp->icmp_hun.ih_pptr); 1537#ifndef icmp_data 1538 pr_retip(&icp->icmp_ip); 1539#else 1540 pr_retip((struct ip *)icp->icmp_data); 1541#endif 1542 break; 1543 case ICMP_TSTAMP: 1544 (void)printf("Timestamp\n"); 1545 /* XXX ID + Seq + 3 timestamps */ 1546 break; 1547 case ICMP_TSTAMPREPLY: 1548 (void)printf("Timestamp Reply\n"); 1549 /* XXX ID + Seq + 3 timestamps */ 1550 break; 1551 case ICMP_IREQ: 1552 (void)printf("Information Request\n"); 1553 /* XXX ID + Seq */ 1554 break; 1555 case ICMP_IREQREPLY: 1556 (void)printf("Information Reply\n"); 1557 /* XXX ID + Seq */ 1558 break; 1559 case ICMP_MASKREQ: 1560 (void)printf("Address Mask Request\n"); 1561 break; 1562 case ICMP_MASKREPLY: 1563 (void)printf("Address Mask Reply\n"); 1564 break; 1565 case ICMP_ROUTERADVERT: 1566 (void)printf("Router Advertisement\n"); 1567 break; 1568 case ICMP_ROUTERSOLICIT: 1569 (void)printf("Router Solicitation\n"); 1570 break; 1571 default: 1572 (void)printf("Bad ICMP type: %d\n", icp->icmp_type); 1573 } 1574} 1575 1576/* 1577 * pr_iph -- 1578 * Print an IP header with options. 1579 */ 1580static void 1581pr_iph(ip) 1582 struct ip *ip; 1583{ 1584 u_char *cp; 1585 int hlen; 1586 1587 hlen = ip->ip_hl << 2; 1588 cp = (u_char *)ip + 20; /* point to options */ 1589 1590 (void)printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst\n"); 1591 (void)printf(" %1x %1x %02x %04x %04x", 1592 ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len), 1593 ntohs(ip->ip_id)); 1594 (void)printf(" %1lx %04lx", 1595 (u_long) (ntohl(ip->ip_off) & 0xe000) >> 13, 1596 (u_long) ntohl(ip->ip_off) & 0x1fff); 1597 (void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p, 1598 ntohs(ip->ip_sum)); 1599 (void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_src.s_addr)); 1600 (void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_dst.s_addr)); 1601 /* dump any option bytes */ 1602 while (hlen-- > 20) { 1603 (void)printf("%02x", *cp++); 1604 } 1605 (void)putchar('\n'); 1606} 1607 1608/* 1609 * pr_addr -- 1610 * Return an ascii host address as a dotted quad and optionally with 1611 * a hostname. 1612 */ 1613static char * 1614pr_addr(ina) 1615 struct in_addr ina; 1616{ 1617 struct hostent *hp; 1618 static char buf[16 + 3 + MAXHOSTNAMELEN]; 1619 1620 if ((options & F_NUMERIC) || 1621 !(hp = gethostbyaddr((char *)&ina, 4, AF_INET))) 1622 return inet_ntoa(ina); 1623 else 1624 (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name, 1625 inet_ntoa(ina)); 1626 return(buf); 1627} 1628 1629/* 1630 * pr_retip -- 1631 * Dump some info on a returned (via ICMP) IP packet. 1632 */ 1633static void 1634pr_retip(ip) 1635 struct ip *ip; 1636{ 1637 u_char *cp; 1638 int hlen; 1639 1640 pr_iph(ip); 1641 hlen = ip->ip_hl << 2; 1642 cp = (u_char *)ip + hlen; 1643 1644 if (ip->ip_p == 6) 1645 (void)printf("TCP: from port %u, to port %u (decimal)\n", 1646 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3))); 1647 else if (ip->ip_p == 17) 1648 (void)printf("UDP: from port %u, to port %u (decimal)\n", 1649 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3))); 1650} 1651 1652static char * 1653pr_ntime (n_time timestamp) 1654{ 1655 static char buf[10]; 1656 int hour, min, sec; 1657 1658 sec = ntohl(timestamp) / 1000; 1659 hour = sec / 60 / 60; 1660 min = (sec % (60 * 60)) / 60; 1661 sec = (sec % (60 * 60)) % 60; 1662 1663 (void)snprintf(buf, sizeof(buf), "%02d:%02d:%02d", hour, min, sec); 1664 1665 return (buf); 1666} 1667 1668static void 1669fill(bp, patp) 1670 char *bp, *patp; 1671{ 1672 char *cp; 1673 int pat[16]; 1674 u_int ii, jj, kk; 1675 1676 for (cp = patp; *cp; cp++) { 1677 if (!isxdigit(*cp)) 1678 errx(EX_USAGE, 1679 "patterns must be specified as hex digits"); 1680 1681 } 1682 ii = sscanf(patp, 1683 "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x", 1684 &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6], 1685 &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12], 1686 &pat[13], &pat[14], &pat[15]); 1687 1688 if (ii > 0) 1689 for (kk = 0; kk <= maxpayload - (TIMEVAL_LEN + ii); kk += ii) 1690 for (jj = 0; jj < ii; ++jj) 1691 bp[jj + kk] = pat[jj]; 1692 if (!(options & F_QUIET)) { 1693 (void)printf("PATTERN: 0x"); 1694 for (jj = 0; jj < ii; ++jj) 1695 (void)printf("%02x", bp[jj] & 0xFF); 1696 (void)printf("\n"); 1697 } 1698} 1699 1700#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC) 1701#define SECOPT " [-P policy]" 1702#else 1703#define SECOPT "" 1704#endif 1705static void 1706usage() 1707{ 1708 1709 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n", 1710"usage: ping [-AaDdfnoQqRrv] [-c count] [-G sweepmaxsize] [-g sweepminsize]", 1711" [-h sweepincrsize] [-i wait] [-l preload] [-M mask | time] [-m ttl]", 1712" " SECOPT " [-p pattern] [-S src_addr] [-s packetsize] [-t timeout]", 1713" [-W waittime] [-z tos] host", 1714" ping [-AaDdfLnoQqRrv] [-c count] [-I iface] [-i wait] [-l preload]", 1715" [-M mask | time] [-m ttl]" SECOPT " [-p pattern] [-S src_addr]", 1716" [-s packetsize] [-T ttl] [-t timeout] [-W waittime]", 1717" [-z tos] mcast-group"); 1718 exit(EX_USAGE); 1719} 1720