ping.c revision 105624
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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38static const char copyright[] = 39"@(#) Copyright (c) 1989, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41#endif /* not lint */ 42 43#ifndef lint 44#if 0 45static char sccsid[] = "@(#)ping.c 8.1 (Berkeley) 6/5/93"; 46#endif 47static const char rcsid[] = 48 "$FreeBSD: head/sbin/ping/ping.c 105624 2002-10-21 11:43:46Z maxim $"; 49#endif /* not lint */ 50 51/* 52 * P I N G . C 53 * 54 * Using the Internet Control Message Protocol (ICMP) "ECHO" facility, 55 * measure round-trip-delays and packet loss across network paths. 56 * 57 * Author - 58 * Mike Muuss 59 * U. S. Army Ballistic Research Laboratory 60 * December, 1983 61 * 62 * Status - 63 * Public Domain. Distribution Unlimited. 64 * Bugs - 65 * More statistics could always be gathered. 66 * This program has to run SUID to ROOT to access the ICMP socket. 67 */ 68 69#include <sys/param.h> /* NB: we rely on this for <sys/types.h> */ 70 71#include <ctype.h> 72#include <err.h> 73#include <errno.h> 74#include <math.h> 75#include <netdb.h> 76#include <signal.h> 77#include <stdio.h> 78#include <stdlib.h> 79#include <string.h> 80#include <sysexits.h> 81#include <termios.h> 82#include <unistd.h> 83 84#include <sys/socket.h> 85#include <sys/time.h> 86#include <sys/uio.h> 87 88#include <netinet/in.h> 89#include <netinet/in_systm.h> 90#include <netinet/ip.h> 91#include <netinet/ip_icmp.h> 92#include <netinet/ip_var.h> 93#include <arpa/inet.h> 94 95#ifdef IPSEC 96#include <netinet6/ipsec.h> 97#endif /*IPSEC*/ 98 99#define INADDR_LEN ((int)sizeof(in_addr_t)) 100#define PHDR_LEN ((int)sizeof(struct timeval)) 101#define DEFDATALEN (64 - PHDR_LEN) /* default data length */ 102#define FLOOD_BACKOFF 20000 /* usecs to back off if F_FLOOD mode */ 103 /* runs out of buffer space */ 104#define MAXIPLEN (sizeof(struct ip) + MAX_IPOPTLEN) 105#define MAXICMPLEN (ICMP_ADVLENMIN + MAX_IPOPTLEN) 106#define MINICMPLEN ICMP_MINLEN 107#define MAXPAYLOAD (IP_MAXPACKET - MAXIPLEN - MINICMPLEN) 108#define MAXWAIT 10 /* max seconds to wait for response */ 109#define MAXALARM (60 * 60) /* max seconds for alarm timeout */ 110 111#define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */ 112#define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */ 113#define SET(bit) (A(bit) |= B(bit)) 114#define CLR(bit) (A(bit) &= (~B(bit))) 115#define TST(bit) (A(bit) & B(bit)) 116 117/* various options */ 118int options; 119#define F_FLOOD 0x0001 120#define F_INTERVAL 0x0002 121#define F_NUMERIC 0x0004 122#define F_PINGFILLED 0x0008 123#define F_QUIET 0x0010 124#define F_RROUTE 0x0020 125#define F_SO_DEBUG 0x0040 126#define F_SO_DONTROUTE 0x0080 127#define F_VERBOSE 0x0100 128#define F_QUIET2 0x0200 129#define F_NOLOOP 0x0400 130#define F_MTTL 0x0800 131#define F_MIF 0x1000 132#define F_AUDIBLE 0x2000 133#ifdef IPSEC 134#ifdef IPSEC_POLICY_IPSEC 135#define F_POLICY 0x4000 136#endif /*IPSEC_POLICY_IPSEC*/ 137#endif /*IPSEC*/ 138#define F_TTL 0x8000 139#define F_MISSED 0x10000 140#define F_ONCE 0x20000 141 142/* 143 * MAX_DUP_CHK is the number of bits in received table, i.e. the maximum 144 * number of received sequence numbers we can keep track of. Change 128 145 * to 8192 for complete accuracy... 146 */ 147#define MAX_DUP_CHK (8 * 128) 148int mx_dup_ck = MAX_DUP_CHK; 149char rcvd_tbl[MAX_DUP_CHK / 8]; 150 151struct sockaddr_in whereto; /* who to ping */ 152int datalen = DEFDATALEN; 153int s; /* socket file descriptor */ 154u_char outpack[MINICMPLEN + MAXPAYLOAD]; 155char BSPACE = '\b'; /* characters written for flood */ 156char BBELL = '\a'; /* characters written for MISSED and AUDIBLE */ 157char DOT = '.'; 158char *hostname; 159char *shostname; 160int ident; /* process id to identify our packets */ 161int uid; /* cached uid for micro-optimization */ 162 163/* counters */ 164long npackets; /* max packets to transmit */ 165long nreceived; /* # of packets we got back */ 166long nrepeats; /* number of duplicates */ 167long ntransmitted; /* sequence # for outbound packets = #sent */ 168long nmissedmax; /* max value of ntransmitted - nreceived - 1 */ 169int interval = 1000; /* interval between packets, ms */ 170 171/* timing */ 172int timing; /* flag to do timing */ 173double tmin = 999999999.0; /* minimum round trip time */ 174double tmax = 0.0; /* maximum round trip time */ 175double tsum = 0.0; /* sum of all times, for doing average */ 176double tsumsq = 0.0; /* sum of all times squared, for std. dev. */ 177 178volatile sig_atomic_t finish_up; /* nonzero if we've been told to finish up */ 179int reset_kerninfo; 180volatile sig_atomic_t siginfo_p; 181 182static void fill(char *, char *); 183static u_short in_cksum(u_short *, int); 184static void check_status(void); 185static void finish(void) __dead2; 186static void pinger(void); 187static char *pr_addr(struct in_addr); 188static void pr_icmph(struct icmp *); 189static void pr_iph(struct ip *); 190static void pr_pack(char *, int, struct sockaddr_in *, struct timeval *); 191static void pr_retip(struct ip *); 192static void status(int); 193static void stopit(int); 194static void tvsub(struct timeval *, struct timeval *); 195static void usage(void) __dead2; 196 197int 198main(argc, argv) 199 int argc; 200 char *const *argv; 201{ 202 struct in_addr ifaddr; 203 struct iovec iov; 204 struct msghdr msg; 205 struct sigaction si_sa; 206 struct sockaddr_in from, sin; 207 struct termios ts; 208 struct timeval last, intvl; 209 struct hostent *hp; 210 struct sockaddr_in *to; 211 double t; 212 u_char *datap, packet[IP_MAXPACKET]; 213 char *ep, *source, *target; 214#ifdef IPSEC_POLICY_IPSEC 215 char *policy_in, *policy_out; 216#endif 217 u_long alarmtimeout, ultmp; 218 int ch, hold, i, packlen, preload, sockerrno, almost_done = 0, ttl; 219 char ctrl[CMSG_SPACE(sizeof(struct timeval))]; 220 char hnamebuf[MAXHOSTNAMELEN], snamebuf[MAXHOSTNAMELEN]; 221#ifdef IP_OPTIONS 222 char rspace[MAX_IPOPTLEN]; /* record route space */ 223#endif 224 unsigned char mttl, loop; 225 226 source = NULL; 227#ifdef IPSEC_POLICY_IPSEC 228 policy_in = policy_out = NULL; 229#endif 230 231 /* 232 * Do the stuff that we need root priv's for *first*, and 233 * then drop our setuid bit. Save error reporting for 234 * after arg parsing. 235 */ 236 s = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 237 sockerrno = errno; 238 239 setuid(getuid()); 240 uid = getuid(); 241 242 alarmtimeout = preload = 0; 243 244 datap = &outpack[MINICMPLEN + PHDR_LEN]; 245 while ((ch = getopt(argc, argv, 246 "AI:LQRS:T:c:adfi:l:m:nop:qrs:t:v" 247#ifdef IPSEC 248#ifdef IPSEC_POLICY_IPSEC 249 "P:" 250#endif /*IPSEC_POLICY_IPSEC*/ 251#endif /*IPSEC*/ 252 )) != -1) 253 { 254 switch(ch) { 255 case 'A': 256 options |= F_MISSED; 257 break; 258 case 'a': 259 options |= F_AUDIBLE; 260 break; 261 case 'c': 262 ultmp = strtoul(optarg, &ep, 0); 263 if (*ep || ep == optarg || ultmp > LONG_MAX || !ultmp) 264 errx(EX_USAGE, 265 "invalid count of packets to transmit: `%s'", 266 optarg); 267 npackets = ultmp; 268 break; 269 case 'd': 270 options |= F_SO_DEBUG; 271 break; 272 case 'f': 273 if (uid) { 274 errno = EPERM; 275 err(EX_NOPERM, "-f flag"); 276 } 277 options |= F_FLOOD; 278 setbuf(stdout, (char *)NULL); 279 break; 280 case 'i': /* wait between sending packets */ 281 t = strtod(optarg, &ep) * 1000.0; 282 if (*ep || ep == optarg || t > (double)INT_MAX) 283 errx(EX_USAGE, "invalid timing interval: `%s'", 284 optarg); 285 options |= F_INTERVAL; 286 interval = (int)t; 287 if (uid && interval < 1000) { 288 errno = EPERM; 289 err(EX_NOPERM, "-i interval too short"); 290 } 291 break; 292 case 'I': /* multicast interface */ 293 if (inet_aton(optarg, &ifaddr) == 0) 294 errx(EX_USAGE, 295 "invalid multicast interface: `%s'", 296 optarg); 297 options |= F_MIF; 298 break; 299 case 'l': 300 ultmp = strtoul(optarg, &ep, 0); 301 if (*ep || ep == optarg || ultmp > INT_MAX) 302 errx(EX_USAGE, 303 "invalid preload value: `%s'", optarg); 304 if (uid) { 305 errno = EPERM; 306 err(EX_NOPERM, "-l flag"); 307 } 308 preload = ultmp; 309 break; 310 case 'L': 311 options |= F_NOLOOP; 312 loop = 0; 313 break; 314 case 'm': /* TTL */ 315 ultmp = strtoul(optarg, &ep, 0); 316 if (*ep || ep == optarg || ultmp > 255) 317 errx(EX_USAGE, "invalid TTL: `%s'", optarg); 318 ttl = ultmp; 319 options |= F_TTL; 320 break; 321 case 'n': 322 options |= F_NUMERIC; 323 break; 324 case 'o': 325 options |= F_ONCE; 326 break; 327 case 'p': /* fill buffer with user pattern */ 328 options |= F_PINGFILLED; 329 fill((char *)datap, optarg); 330 break; 331 case 'Q': 332 options |= F_QUIET2; 333 break; 334 case 'q': 335 options |= F_QUIET; 336 break; 337 case 'R': 338 options |= F_RROUTE; 339 break; 340 case 'r': 341 options |= F_SO_DONTROUTE; 342 break; 343 case 's': /* size of packet to send */ 344 if (uid) { 345 errno = EPERM; 346 err(EX_NOPERM, "-s flag"); 347 } 348 ultmp = strtoul(optarg, &ep, 0); 349 if (ultmp > MAXPAYLOAD) 350 errx(EX_USAGE, 351 "packet size too large: %lu > %u", 352 ultmp, MAXPAYLOAD); 353 if (*ep || ep == optarg) 354 errx(EX_USAGE, "invalid packet size: `%s'", 355 optarg); 356 datalen = ultmp; 357 break; 358 case 'S': 359 source = optarg; 360 break; 361 case 't': 362 alarmtimeout = strtoul(optarg, &ep, 0); 363 if ((alarmtimeout < 1) || (alarmtimeout == ULONG_MAX)) 364 errx(EX_USAGE, "invalid timeout: `%s'", 365 optarg); 366 if (alarmtimeout > MAXALARM) 367 errx(EX_USAGE, "invalid timeout: `%s' > %d", 368 optarg, MAXALARM); 369 alarm((int)alarmtimeout); 370 break; 371 case 'T': /* multicast TTL */ 372 ultmp = strtoul(optarg, &ep, 0); 373 if (*ep || ep == optarg || ultmp > 255) 374 errx(EX_USAGE, "invalid multicast TTL: `%s'", 375 optarg); 376 mttl = ultmp; 377 options |= F_MTTL; 378 break; 379 case 'v': 380 options |= F_VERBOSE; 381 break; 382#ifdef IPSEC 383#ifdef IPSEC_POLICY_IPSEC 384 case 'P': 385 options |= F_POLICY; 386 if (!strncmp("in", optarg, 2)) 387 policy_in = strdup(optarg); 388 else if (!strncmp("out", optarg, 3)) 389 policy_out = strdup(optarg); 390 else 391 errx(1, "invalid security policy"); 392 break; 393#endif /*IPSEC_POLICY_IPSEC*/ 394#endif /*IPSEC*/ 395 default: 396 usage(); 397 } 398 } 399 400 if (argc - optind != 1) 401 usage(); 402 target = argv[optind]; 403 404 if (source) { 405 bzero((char *)&sin, sizeof(sin)); 406 sin.sin_family = AF_INET; 407 if (inet_aton(source, &sin.sin_addr) != 0) { 408 shostname = source; 409 } else { 410 hp = gethostbyname2(source, AF_INET); 411 if (!hp) 412 errx(EX_NOHOST, "cannot resolve %s: %s", 413 source, hstrerror(h_errno)); 414 415 sin.sin_len = sizeof sin; 416 if (hp->h_length > sizeof(sin.sin_addr) || 417 hp->h_length < 0) 418 errx(1, "gethostbyname2: illegal address"); 419 memcpy(&sin.sin_addr, hp->h_addr_list[0], 420 sizeof(sin.sin_addr)); 421 (void)strncpy(snamebuf, hp->h_name, 422 sizeof(snamebuf) - 1); 423 snamebuf[sizeof(snamebuf) - 1] = '\0'; 424 shostname = snamebuf; 425 } 426 if (bind(s, (struct sockaddr *)&sin, sizeof sin) == -1) 427 err(1, "bind"); 428 } 429 430 bzero(&whereto, sizeof(whereto)); 431 to = &whereto; 432 to->sin_family = AF_INET; 433 to->sin_len = sizeof *to; 434 if (inet_aton(target, &to->sin_addr) != 0) { 435 hostname = target; 436 } else { 437 hp = gethostbyname2(target, AF_INET); 438 if (!hp) 439 errx(EX_NOHOST, "cannot resolve %s: %s", 440 target, hstrerror(h_errno)); 441 442 if (hp->h_length > sizeof(to->sin_addr)) 443 errx(1, "gethostbyname2 returned an illegal address"); 444 memcpy(&to->sin_addr, hp->h_addr_list[0], sizeof to->sin_addr); 445 (void)strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1); 446 hnamebuf[sizeof(hnamebuf) - 1] = '\0'; 447 hostname = hnamebuf; 448 } 449 450 if (options & F_FLOOD && options & F_INTERVAL) 451 errx(EX_USAGE, "-f and -i: incompatible options"); 452 453 if (options & F_FLOOD && IN_MULTICAST(ntohl(to->sin_addr.s_addr))) 454 errx(EX_USAGE, 455 "-f flag cannot be used with multicast destination"); 456 if (options & (F_MIF | F_NOLOOP | F_MTTL) 457 && !IN_MULTICAST(ntohl(to->sin_addr.s_addr))) 458 errx(EX_USAGE, 459 "-I, -L, -T flags cannot be used with unicast destination"); 460 461 if (datalen >= PHDR_LEN) /* can we time transfer */ 462 timing = 1; 463 packlen = MAXIPLEN + MAXICMPLEN + datalen; 464 packlen = packlen > IP_MAXPACKET ? IP_MAXPACKET : packlen; 465 466 if (!(options & F_PINGFILLED)) 467 for (i = PHDR_LEN; i < datalen; ++i) 468 *datap++ = i; 469 470 ident = getpid() & 0xFFFF; 471 472 if (s < 0) { 473 errno = sockerrno; 474 err(EX_OSERR, "socket"); 475 } 476 hold = 1; 477 if (options & F_SO_DEBUG) 478 (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&hold, 479 sizeof(hold)); 480 if (options & F_SO_DONTROUTE) 481 (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&hold, 482 sizeof(hold)); 483#ifdef IPSEC 484#ifdef IPSEC_POLICY_IPSEC 485 if (options & F_POLICY) { 486 char *buf; 487 if (policy_in != NULL) { 488 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 489 if (buf == NULL) 490 errx(EX_CONFIG, "%s", ipsec_strerror()); 491 if (setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY, 492 buf, ipsec_get_policylen(buf)) < 0) 493 err(EX_CONFIG, 494 "ipsec policy cannot be configured"); 495 free(buf); 496 } 497 498 if (policy_out != NULL) { 499 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 500 if (buf == NULL) 501 errx(EX_CONFIG, "%s", ipsec_strerror()); 502 if (setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY, 503 buf, ipsec_get_policylen(buf)) < 0) 504 err(EX_CONFIG, 505 "ipsec policy cannot be configured"); 506 free(buf); 507 } 508 } 509#endif /*IPSEC_POLICY_IPSEC*/ 510#endif /*IPSEC*/ 511 512 /* record route option */ 513 if (options & F_RROUTE) { 514#ifdef IP_OPTIONS 515 bzero(rspace, sizeof(rspace)); 516 rspace[IPOPT_OPTVAL] = IPOPT_RR; 517 rspace[IPOPT_OLEN] = sizeof(rspace) - 1; 518 rspace[IPOPT_OFFSET] = IPOPT_MINOFF; 519 rspace[sizeof(rspace) - 1] = IPOPT_EOL; 520 if (setsockopt(s, IPPROTO_IP, IP_OPTIONS, rspace, 521 sizeof(rspace)) < 0) 522 err(EX_OSERR, "setsockopt IP_OPTIONS"); 523#else 524 errx(EX_UNAVAILABLE, 525 "record route not available in this implementation"); 526#endif /* IP_OPTIONS */ 527 } 528 529 if (options & F_TTL) { 530 if (setsockopt(s, IPPROTO_IP, IP_TTL, &ttl, 531 sizeof(ttl)) < 0) { 532 err(EX_OSERR, "setsockopt IP_TTL"); 533 } 534 } 535 if (options & F_NOLOOP) { 536 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, &loop, 537 sizeof(loop)) < 0) { 538 err(EX_OSERR, "setsockopt IP_MULTICAST_LOOP"); 539 } 540 } 541 if (options & F_MTTL) { 542 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &mttl, 543 sizeof(mttl)) < 0) { 544 err(EX_OSERR, "setsockopt IP_MULTICAST_TTL"); 545 } 546 } 547 if (options & F_MIF) { 548 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, &ifaddr, 549 sizeof(ifaddr)) < 0) { 550 err(EX_OSERR, "setsockopt IP_MULTICAST_IF"); 551 } 552 } 553#ifdef SO_TIMESTAMP 554 { int on = 1; 555 if (setsockopt(s, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on)) < 0) 556 err(EX_OSERR, "setsockopt SO_TIMESTAMP"); 557 } 558#endif 559 560 /* 561 * When pinging the broadcast address, you can get a lot of answers. 562 * Doing something so evil is useful if you are trying to stress the 563 * ethernet, or just want to fill the arp cache to get some stuff for 564 * /etc/ethers. But beware: RFC 1122 allows hosts to ignore broadcast 565 * or multicast pings if they wish. 566 */ 567 568 /* 569 * XXX receive buffer needs undetermined space for mbuf overhead 570 * as well. 571 */ 572 hold = IP_MAXPACKET + 128; 573 (void)setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&hold, 574 sizeof(hold)); 575 576 if (!uid) { 577 (void)setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&hold, 578 sizeof(hold)); 579 } 580 581 if (to->sin_family == AF_INET) { 582 (void)printf("PING %s (%s)", hostname, 583 inet_ntoa(to->sin_addr)); 584 if (source) 585 (void)printf(" from %s", shostname); 586 (void)printf(": %d data bytes\n", datalen); 587 } else 588 (void)printf("PING %s: %d data bytes\n", hostname, datalen); 589 590 /* 591 * Use sigaction() instead of signal() to get unambiguous semantics, 592 * in particular with SA_RESTART not set. 593 */ 594 595 sigemptyset(&si_sa.sa_mask); 596 si_sa.sa_flags = 0; 597 598 si_sa.sa_handler = stopit; 599 if (sigaction(SIGINT, &si_sa, 0) == -1) { 600 err(EX_OSERR, "sigaction SIGINT"); 601 } 602 603 si_sa.sa_handler = status; 604 if (sigaction(SIGINFO, &si_sa, 0) == -1) { 605 err(EX_OSERR, "sigaction"); 606 } 607 608 if (alarmtimeout > 0) { 609 si_sa.sa_handler = stopit; 610 if (sigaction(SIGALRM, &si_sa, 0) == -1) 611 err(EX_OSERR, "sigaction SIGALRM"); 612 } 613 614 bzero(&msg, sizeof(msg)); 615 msg.msg_name = (caddr_t)&from; 616 msg.msg_iov = &iov; 617 msg.msg_iovlen = 1; 618#ifdef SO_TIMESTAMP 619 msg.msg_control = (caddr_t)ctrl; 620#endif 621 iov.iov_base = packet; 622 iov.iov_len = packlen; 623 624 if (tcgetattr(STDOUT_FILENO, &ts) != -1) { 625 reset_kerninfo = !(ts.c_lflag & NOKERNINFO); 626 ts.c_lflag |= NOKERNINFO; 627 tcsetattr(STDOUT_FILENO, TCSANOW, &ts); 628 } 629 630 if (preload == 0) 631 pinger(); /* send the first ping */ 632 else { 633 if (npackets != 0 && preload > npackets) 634 preload = npackets; 635 while (preload--) /* fire off them quickies */ 636 pinger(); 637 } 638 (void)gettimeofday(&last, NULL); 639 640 if (options & F_FLOOD) { 641 intvl.tv_sec = 0; 642 intvl.tv_usec = 10000; 643 } else { 644 intvl.tv_sec = interval / 1000; 645 intvl.tv_usec = interval % 1000 * 1000; 646 } 647 648 while (!finish_up) { 649 int cc; 650 int n; 651 struct timeval timeout, now; 652 fd_set rfds; 653 654 check_status(); 655 if (s >= FD_SETSIZE) 656 errx(EX_OSERR, "descriptor too large"); 657 FD_ZERO(&rfds); 658 FD_SET(s, &rfds); 659 (void)gettimeofday(&now, NULL); 660 timeout.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec; 661 timeout.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec; 662 while (timeout.tv_usec < 0) { 663 timeout.tv_usec += 1000000; 664 timeout.tv_sec--; 665 } 666 while (timeout.tv_usec >= 1000000) { 667 timeout.tv_usec -= 1000000; 668 timeout.tv_sec++; 669 } 670 if (timeout.tv_sec < 0) 671 timeout.tv_sec = timeout.tv_usec = 0; 672 n = select(s + 1, &rfds, NULL, NULL, &timeout); 673 if (n < 0) 674 continue; /* Must be EINTR. */ 675 if (n == 1) { 676 struct timeval *t = NULL; 677#ifdef SO_TIMESTAMP 678 struct cmsghdr *cmsg = (struct cmsghdr *)&ctrl; 679 680 msg.msg_controllen = sizeof(ctrl); 681#endif 682 msg.msg_namelen = sizeof(from); 683 if ((cc = recvmsg(s, &msg, 0)) < 0) { 684 if (errno == EINTR) 685 continue; 686 warn("recvmsg"); 687 continue; 688 } 689#ifdef SO_TIMESTAMP 690 if (cmsg->cmsg_level == SOL_SOCKET && 691 cmsg->cmsg_type == SCM_TIMESTAMP && 692 cmsg->cmsg_len == CMSG_LEN(sizeof *t)) { 693 /* Copy to avoid alignment problems: */ 694 memcpy(&now, CMSG_DATA(cmsg), sizeof(now)); 695 t = &now; 696 } 697#endif 698 if (t == NULL) { 699 (void)gettimeofday(&now, NULL); 700 t = &now; 701 } 702 pr_pack((char *)packet, cc, &from, t); 703 if (options & F_ONCE && nreceived || 704 npackets && nreceived >= npackets) 705 break; 706 } 707 if (n == 0 || options & F_FLOOD) { 708 if (!npackets || ntransmitted < npackets) 709 pinger(); 710 else { 711 if (almost_done) 712 break; 713 almost_done = 1; 714 intvl.tv_usec = 0; 715 if (nreceived) { 716 intvl.tv_sec = 2 * tmax / 1000; 717 if (!intvl.tv_sec) 718 intvl.tv_sec = 1; 719 } else 720 intvl.tv_sec = MAXWAIT; 721 } 722 (void)gettimeofday(&last, NULL); 723 724 if (ntransmitted - nreceived - 1 > nmissedmax) { 725 nmissedmax = ntransmitted - nreceived - 1; 726 if (options & F_MISSED) 727 (void)write(STDOUT_FILENO, &BBELL, 1); 728 } 729 } 730 } 731 finish(); 732 /* NOTREACHED */ 733 exit(0); /* Make the compiler happy */ 734} 735 736/* 737 * stopit -- 738 * Set the global bit that causes the main loop to quit. 739 * Do NOT call finish() from here, since finish() does far too much 740 * to be called from a signal handler. 741 */ 742void 743stopit(sig) 744 int sig __unused; 745{ 746 747 finish_up = 1; 748} 749 750/* 751 * pinger -- 752 * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet 753 * will be added on by the kernel. The ID field is our UNIX process ID, 754 * and the sequence number is an ascending integer. The first PHDR_LEN 755 * bytes of the data portion are used to hold a UNIX "timeval" struct in 756 * host byte-order, to compute the round-trip time. 757 */ 758static void 759pinger(void) 760{ 761 struct icmp *icp; 762 int cc, i; 763 764 icp = (struct icmp *)outpack; 765 icp->icmp_type = ICMP_ECHO; 766 icp->icmp_code = 0; 767 icp->icmp_cksum = 0; 768 icp->icmp_seq = htons(ntransmitted); 769 icp->icmp_id = ident; /* ID */ 770 771 CLR(ntransmitted % mx_dup_ck); 772 773 if (timing) 774 (void)gettimeofday((struct timeval *)&outpack[MINICMPLEN], 775 (struct timezone *)NULL); 776 777 cc = MINICMPLEN + datalen; 778 779 /* compute ICMP checksum here */ 780 icp->icmp_cksum = in_cksum((u_short *)icp, cc); 781 782 i = sendto(s, (char *)outpack, cc, 0, (struct sockaddr *)&whereto, 783 sizeof(whereto)); 784 785 if (i < 0 || i != cc) { 786 if (i < 0) { 787 if (options & F_FLOOD && errno == ENOBUFS) { 788 usleep(FLOOD_BACKOFF); 789 return; 790 } 791 warn("sendto"); 792 } else { 793 warn("%s: partial write: %d of %d bytes", 794 hostname, i, cc); 795 } 796 } 797 ntransmitted++; 798 if (!(options & F_QUIET) && options & F_FLOOD) 799 (void)write(STDOUT_FILENO, &DOT, 1); 800} 801 802/* 803 * pr_pack -- 804 * Print out the packet, if it came from us. This logic is necessary 805 * because ALL readers of the ICMP socket get a copy of ALL ICMP packets 806 * which arrive ('tis only fair). This permits multiple copies of this 807 * program to be run without having intermingled output (or statistics!). 808 */ 809static void 810pr_pack(buf, cc, from, tv) 811 char *buf; 812 int cc; 813 struct sockaddr_in *from; 814 struct timeval *tv; 815{ 816 struct in_addr ina; 817 u_char *cp, *dp; 818 struct icmp *icp; 819 struct ip *ip; 820 const void *tp; 821 double triptime; 822 int dupflag, hlen, i, j, seq; 823 static int old_rrlen; 824 static char old_rr[MAX_IPOPTLEN]; 825 826 /* Check the IP header */ 827 ip = (struct ip *)buf; 828 hlen = ip->ip_hl << 2; 829 if (cc < hlen + ICMP_MINLEN) { 830 if (options & F_VERBOSE) 831 warn("packet too short (%d bytes) from %s", cc, 832 inet_ntoa(from->sin_addr)); 833 return; 834 } 835 836 /* Now the ICMP part */ 837 cc -= hlen; 838 icp = (struct icmp *)(buf + hlen); 839 if (icp->icmp_type == ICMP_ECHOREPLY) { 840 if (icp->icmp_id != ident) 841 return; /* 'Twas not our ECHO */ 842 ++nreceived; 843 triptime = 0.0; 844 if (timing) { 845 struct timeval tv1; 846#ifndef icmp_data 847 tp = &icp->icmp_ip; 848#else 849 tp = icp->icmp_data; 850#endif 851 /* Copy to avoid alignment problems: */ 852 memcpy(&tv1, tp, sizeof(tv1)); 853 tvsub(tv, &tv1); 854 triptime = ((double)tv->tv_sec) * 1000.0 + 855 ((double)tv->tv_usec) / 1000.0; 856 tsum += triptime; 857 tsumsq += triptime * triptime; 858 if (triptime < tmin) 859 tmin = triptime; 860 if (triptime > tmax) 861 tmax = triptime; 862 } 863 864 seq = ntohs(icp->icmp_seq); 865 866 if (TST(seq % mx_dup_ck)) { 867 ++nrepeats; 868 --nreceived; 869 dupflag = 1; 870 } else { 871 SET(seq % mx_dup_ck); 872 dupflag = 0; 873 } 874 875 if (options & F_QUIET) 876 return; 877 878 if (options & F_FLOOD) 879 (void)write(STDOUT_FILENO, &BSPACE, 1); 880 else { 881 (void)printf("%d bytes from %s: icmp_seq=%u", cc, 882 inet_ntoa(*(struct in_addr *)&from->sin_addr.s_addr), 883 seq); 884 (void)printf(" ttl=%d", ip->ip_ttl); 885 if (timing) 886 (void)printf(" time=%.3f ms", triptime); 887 if (dupflag) 888 (void)printf(" (DUP!)"); 889 if (options & F_AUDIBLE) 890 (void)write(STDOUT_FILENO, &BBELL, 1); 891 /* check the data */ 892 cp = (u_char*)&icp->icmp_data[PHDR_LEN]; 893 dp = &outpack[MINICMPLEN + PHDR_LEN]; 894 for (i = PHDR_LEN; i < datalen; ++i, ++cp, ++dp) { 895 if (*cp != *dp) { 896 (void)printf("\nwrong data byte #%d should be 0x%x but was 0x%x", 897 i, *dp, *cp); 898 (void)printf("\ncp:"); 899 cp = (u_char*)&icp->icmp_data[0]; 900 for (i = 0; i < datalen; ++i, ++cp) { 901 if ((i % 32) == 8) 902 (void)printf("\n\t"); 903 (void)printf("%x ", *cp); 904 } 905 (void)printf("\ndp:"); 906 cp = &outpack[MINICMPLEN]; 907 for (i = 0; i < datalen; ++i, ++cp) { 908 if ((i % 32) == 8) 909 (void)printf("\n\t"); 910 (void)printf("%x ", *cp); 911 } 912 break; 913 } 914 } 915 } 916 } else { 917 /* 918 * We've got something other than an ECHOREPLY. 919 * See if it's a reply to something that we sent. 920 * We can compare IP destination, protocol, 921 * and ICMP type and ID. 922 * 923 * Only print all the error messages if we are running 924 * as root to avoid leaking information not normally 925 * available to those not running as root. 926 */ 927#ifndef icmp_data 928 struct ip *oip = &icp->icmp_ip; 929#else 930 struct ip *oip = (struct ip *)icp->icmp_data; 931#endif 932 struct icmp *oicmp = (struct icmp *)(oip + 1); 933 934 if (((options & F_VERBOSE) && uid == 0) || 935 (!(options & F_QUIET2) && 936 (oip->ip_dst.s_addr == whereto.sin_addr.s_addr) && 937 (oip->ip_p == IPPROTO_ICMP) && 938 (oicmp->icmp_type == ICMP_ECHO) && 939 (oicmp->icmp_id == ident))) { 940 (void)printf("%d bytes from %s: ", cc, 941 pr_addr(from->sin_addr)); 942 pr_icmph(icp); 943 } else 944 return; 945 } 946 947 /* Display any IP options */ 948 cp = (u_char *)buf + sizeof(struct ip); 949 950 for (; hlen > (int)sizeof(struct ip); --hlen, ++cp) 951 switch (*cp) { 952 case IPOPT_EOL: 953 hlen = 0; 954 break; 955 case IPOPT_LSRR: 956 (void)printf("\nLSRR: "); 957 j = cp[IPOPT_OLEN] - IPOPT_MINOFF + 1; 958 hlen -= 2; 959 cp += 2; 960 if (j >= INADDR_LEN && 961 j <= hlen - (int)sizeof(struct ip)) { 962 for (;;) { 963 bcopy(++cp, &ina.s_addr, INADDR_LEN); 964 if (ina.s_addr == 0) 965 (void)printf("\t0.0.0.0"); 966 else 967 (void)printf("\t%s", 968 pr_addr(ina)); 969 hlen -= INADDR_LEN; 970 cp += INADDR_LEN - 1; 971 j -= INADDR_LEN; 972 if (j < INADDR_LEN) 973 break; 974 (void)putchar('\n'); 975 } 976 } else 977 (void)printf("\t(truncated route)\n"); 978 break; 979 case IPOPT_RR: 980 j = cp[IPOPT_OLEN]; /* get length */ 981 i = cp[IPOPT_OFFSET]; /* and pointer */ 982 hlen -= 2; 983 cp += 2; 984 if (i > j) 985 i = j; 986 i = i - IPOPT_MINOFF + 1; 987 if (i < 0 || i > (hlen - (int)sizeof(struct ip))) { 988 old_rrlen = 0; 989 continue; 990 } 991 if (i == old_rrlen 992 && !bcmp((char *)cp, old_rr, i) 993 && !(options & F_FLOOD)) { 994 (void)printf("\t(same route)"); 995 hlen -= i; 996 cp += i; 997 break; 998 } 999 old_rrlen = i; 1000 bcopy((char *)cp, old_rr, i); 1001 1002 (void)printf("\nRR: "); 1003 1004 if (i >= INADDR_LEN && 1005 i <= hlen - (int)sizeof(struct ip)) { 1006 for (;;) { 1007 bcopy(++cp, &ina.s_addr, INADDR_LEN); 1008 if (ina.s_addr == 0) 1009 (void)printf("\t0.0.0.0"); 1010 else 1011 (void)printf("\t%s", 1012 pr_addr(ina)); 1013 hlen -= INADDR_LEN; 1014 cp += INADDR_LEN - 1; 1015 i -= INADDR_LEN; 1016 if (i < INADDR_LEN) 1017 break; 1018 (void)putchar('\n'); 1019 } 1020 } else 1021 (void)printf("\t(truncated route)"); 1022 break; 1023 case IPOPT_NOP: 1024 (void)printf("\nNOP"); 1025 break; 1026 default: 1027 (void)printf("\nunknown option %x", *cp); 1028 break; 1029 } 1030 if (!(options & F_FLOOD)) { 1031 (void)putchar('\n'); 1032 (void)fflush(stdout); 1033 } 1034} 1035 1036/* 1037 * in_cksum -- 1038 * Checksum routine for Internet Protocol family headers (C Version) 1039 */ 1040u_short 1041in_cksum(addr, len) 1042 u_short *addr; 1043 int len; 1044{ 1045 int nleft, sum; 1046 u_short *w; 1047 union { 1048 u_short us; 1049 u_char uc[2]; 1050 } last; 1051 u_short answer; 1052 1053 nleft = len; 1054 sum = 0; 1055 w = addr; 1056 1057 /* 1058 * Our algorithm is simple, using a 32 bit accumulator (sum), we add 1059 * sequential 16 bit words to it, and at the end, fold back all the 1060 * carry bits from the top 16 bits into the lower 16 bits. 1061 */ 1062 while (nleft > 1) { 1063 sum += *w++; 1064 nleft -= 2; 1065 } 1066 1067 /* mop up an odd byte, if necessary */ 1068 if (nleft == 1) { 1069 last.uc[0] = *(u_char *)w; 1070 last.uc[1] = 0; 1071 sum += last.us; 1072 } 1073 1074 /* add back carry outs from top 16 bits to low 16 bits */ 1075 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ 1076 sum += (sum >> 16); /* add carry */ 1077 answer = ~sum; /* truncate to 16 bits */ 1078 return(answer); 1079} 1080 1081/* 1082 * tvsub -- 1083 * Subtract 2 timeval structs: out = out - in. Out is assumed to 1084 * be >= in. 1085 */ 1086static void 1087tvsub(out, in) 1088 struct timeval *out, *in; 1089{ 1090 1091 if ((out->tv_usec -= in->tv_usec) < 0) { 1092 --out->tv_sec; 1093 out->tv_usec += 1000000; 1094 } 1095 out->tv_sec -= in->tv_sec; 1096} 1097 1098/* 1099 * status -- 1100 * Print out statistics when SIGINFO is received. 1101 */ 1102 1103static void 1104status(sig) 1105 int sig __unused; 1106{ 1107 1108 siginfo_p = 1; 1109} 1110 1111static void 1112check_status() 1113{ 1114 1115 if (siginfo_p) { 1116 siginfo_p = 0; 1117 (void)fprintf(stderr, 1118 "\r%ld/%ld packets received (%.0f%%) %.3f min / %.3f avg / %.3f max\n", 1119 nreceived, ntransmitted, 1120 ntransmitted ? nreceived * 100.0 / ntransmitted : 0.0, 1121 nreceived ? tmin : 0.0, 1122 nreceived + nrepeats ? tsum / (nreceived + nrepeats) : tsum, 1123 tmax); 1124 } 1125} 1126 1127/* 1128 * finish -- 1129 * Print out statistics, and give up. 1130 */ 1131static void 1132finish() 1133{ 1134 1135 struct termios ts; 1136 1137 (void)signal(SIGINT, SIG_IGN); 1138 (void)signal(SIGALRM, SIG_IGN); 1139 (void)putchar('\n'); 1140 (void)fflush(stdout); 1141 (void)printf("--- %s ping statistics ---\n", hostname); 1142 (void)printf("%ld packets transmitted, ", ntransmitted); 1143 (void)printf("%ld packets received, ", nreceived); 1144 if (nrepeats) 1145 (void)printf("+%ld duplicates, ", nrepeats); 1146 if (ntransmitted) { 1147 if (nreceived > ntransmitted) 1148 (void)printf("-- somebody's printing up packets!"); 1149 else 1150 (void)printf("%d%% packet loss", 1151 (int)(((ntransmitted - nreceived) * 100) / 1152 ntransmitted)); 1153 } 1154 (void)putchar('\n'); 1155 if (nreceived && timing) { 1156 double n = nreceived + nrepeats; 1157 double avg = tsum / n; 1158 double vari = tsumsq / n - avg * avg; 1159 (void)printf( 1160 "round-trip min/avg/max/stddev = %.3f/%.3f/%.3f/%.3f ms\n", 1161 tmin, avg, tmax, sqrt(vari)); 1162 } 1163 if (reset_kerninfo && tcgetattr(STDOUT_FILENO, &ts) != -1) { 1164 ts.c_lflag &= ~NOKERNINFO; 1165 tcsetattr(STDOUT_FILENO, TCSANOW, &ts); 1166 } 1167 1168 if (nreceived) 1169 exit(0); 1170 else 1171 exit(2); 1172} 1173 1174#ifdef notdef 1175static char *ttab[] = { 1176 "Echo Reply", /* ip + seq + udata */ 1177 "Dest Unreachable", /* net, host, proto, port, frag, sr + IP */ 1178 "Source Quench", /* IP */ 1179 "Redirect", /* redirect type, gateway, + IP */ 1180 "Echo", 1181 "Time Exceeded", /* transit, frag reassem + IP */ 1182 "Parameter Problem", /* pointer + IP */ 1183 "Timestamp", /* id + seq + three timestamps */ 1184 "Timestamp Reply", /* " */ 1185 "Info Request", /* id + sq */ 1186 "Info Reply" /* " */ 1187}; 1188#endif 1189 1190/* 1191 * pr_icmph -- 1192 * Print a descriptive string about an ICMP header. 1193 */ 1194static void 1195pr_icmph(icp) 1196 struct icmp *icp; 1197{ 1198 1199 switch(icp->icmp_type) { 1200 case ICMP_ECHOREPLY: 1201 (void)printf("Echo Reply\n"); 1202 /* XXX ID + Seq + Data */ 1203 break; 1204 case ICMP_UNREACH: 1205 switch(icp->icmp_code) { 1206 case ICMP_UNREACH_NET: 1207 (void)printf("Destination Net Unreachable\n"); 1208 break; 1209 case ICMP_UNREACH_HOST: 1210 (void)printf("Destination Host Unreachable\n"); 1211 break; 1212 case ICMP_UNREACH_PROTOCOL: 1213 (void)printf("Destination Protocol Unreachable\n"); 1214 break; 1215 case ICMP_UNREACH_PORT: 1216 (void)printf("Destination Port Unreachable\n"); 1217 break; 1218 case ICMP_UNREACH_NEEDFRAG: 1219 (void)printf("frag needed and DF set (MTU %d)\n", 1220 ntohs(icp->icmp_nextmtu)); 1221 break; 1222 case ICMP_UNREACH_SRCFAIL: 1223 (void)printf("Source Route Failed\n"); 1224 break; 1225 case ICMP_UNREACH_FILTER_PROHIB: 1226 (void)printf("Communication prohibited by filter\n"); 1227 break; 1228 default: 1229 (void)printf("Dest Unreachable, Bad Code: %d\n", 1230 icp->icmp_code); 1231 break; 1232 } 1233 /* Print returned IP header information */ 1234#ifndef icmp_data 1235 pr_retip(&icp->icmp_ip); 1236#else 1237 pr_retip((struct ip *)icp->icmp_data); 1238#endif 1239 break; 1240 case ICMP_SOURCEQUENCH: 1241 (void)printf("Source Quench\n"); 1242#ifndef icmp_data 1243 pr_retip(&icp->icmp_ip); 1244#else 1245 pr_retip((struct ip *)icp->icmp_data); 1246#endif 1247 break; 1248 case ICMP_REDIRECT: 1249 switch(icp->icmp_code) { 1250 case ICMP_REDIRECT_NET: 1251 (void)printf("Redirect Network"); 1252 break; 1253 case ICMP_REDIRECT_HOST: 1254 (void)printf("Redirect Host"); 1255 break; 1256 case ICMP_REDIRECT_TOSNET: 1257 (void)printf("Redirect Type of Service and Network"); 1258 break; 1259 case ICMP_REDIRECT_TOSHOST: 1260 (void)printf("Redirect Type of Service and Host"); 1261 break; 1262 default: 1263 (void)printf("Redirect, Bad Code: %d", icp->icmp_code); 1264 break; 1265 } 1266 (void)printf("(New addr: %s)\n", inet_ntoa(icp->icmp_gwaddr)); 1267#ifndef icmp_data 1268 pr_retip(&icp->icmp_ip); 1269#else 1270 pr_retip((struct ip *)icp->icmp_data); 1271#endif 1272 break; 1273 case ICMP_ECHO: 1274 (void)printf("Echo Request\n"); 1275 /* XXX ID + Seq + Data */ 1276 break; 1277 case ICMP_TIMXCEED: 1278 switch(icp->icmp_code) { 1279 case ICMP_TIMXCEED_INTRANS: 1280 (void)printf("Time to live exceeded\n"); 1281 break; 1282 case ICMP_TIMXCEED_REASS: 1283 (void)printf("Frag reassembly time exceeded\n"); 1284 break; 1285 default: 1286 (void)printf("Time exceeded, Bad Code: %d\n", 1287 icp->icmp_code); 1288 break; 1289 } 1290#ifndef icmp_data 1291 pr_retip(&icp->icmp_ip); 1292#else 1293 pr_retip((struct ip *)icp->icmp_data); 1294#endif 1295 break; 1296 case ICMP_PARAMPROB: 1297 (void)printf("Parameter problem: pointer = 0x%02x\n", 1298 icp->icmp_hun.ih_pptr); 1299#ifndef icmp_data 1300 pr_retip(&icp->icmp_ip); 1301#else 1302 pr_retip((struct ip *)icp->icmp_data); 1303#endif 1304 break; 1305 case ICMP_TSTAMP: 1306 (void)printf("Timestamp\n"); 1307 /* XXX ID + Seq + 3 timestamps */ 1308 break; 1309 case ICMP_TSTAMPREPLY: 1310 (void)printf("Timestamp Reply\n"); 1311 /* XXX ID + Seq + 3 timestamps */ 1312 break; 1313 case ICMP_IREQ: 1314 (void)printf("Information Request\n"); 1315 /* XXX ID + Seq */ 1316 break; 1317 case ICMP_IREQREPLY: 1318 (void)printf("Information Reply\n"); 1319 /* XXX ID + Seq */ 1320 break; 1321 case ICMP_MASKREQ: 1322 (void)printf("Address Mask Request\n"); 1323 break; 1324 case ICMP_MASKREPLY: 1325 (void)printf("Address Mask Reply\n"); 1326 break; 1327 case ICMP_ROUTERADVERT: 1328 (void)printf("Router Advertisement\n"); 1329 break; 1330 case ICMP_ROUTERSOLICIT: 1331 (void)printf("Router Solicitation\n"); 1332 break; 1333 default: 1334 (void)printf("Bad ICMP type: %d\n", icp->icmp_type); 1335 } 1336} 1337 1338/* 1339 * pr_iph -- 1340 * Print an IP header with options. 1341 */ 1342static void 1343pr_iph(ip) 1344 struct ip *ip; 1345{ 1346 u_char *cp; 1347 int hlen; 1348 1349 hlen = ip->ip_hl << 2; 1350 cp = (u_char *)ip + 20; /* point to options */ 1351 1352 (void)printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst\n"); 1353 (void)printf(" %1x %1x %02x %04x %04x", 1354 ip->ip_v, ip->ip_hl, ip->ip_tos, ntohs(ip->ip_len), 1355 ntohs(ip->ip_id)); 1356 (void)printf(" %1lx %04lx", 1357 (u_long) (ntohl(ip->ip_off) & 0xe000) >> 13, 1358 (u_long) ntohl(ip->ip_off) & 0x1fff); 1359 (void)printf(" %02x %02x %04x", ip->ip_ttl, ip->ip_p, 1360 ntohs(ip->ip_sum)); 1361 (void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_src.s_addr)); 1362 (void)printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->ip_dst.s_addr)); 1363 /* dump any option bytes */ 1364 while (hlen-- > 20) { 1365 (void)printf("%02x", *cp++); 1366 } 1367 (void)putchar('\n'); 1368} 1369 1370/* 1371 * pr_addr -- 1372 * Return an ascii host address as a dotted quad and optionally with 1373 * a hostname. 1374 */ 1375static char * 1376pr_addr(ina) 1377 struct in_addr ina; 1378{ 1379 struct hostent *hp; 1380 static char buf[16 + 3 + MAXHOSTNAMELEN]; 1381 1382 if ((options & F_NUMERIC) || 1383 !(hp = gethostbyaddr((char *)&ina, 4, AF_INET))) 1384 return inet_ntoa(ina); 1385 else 1386 (void)snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name, 1387 inet_ntoa(ina)); 1388 return(buf); 1389} 1390 1391/* 1392 * pr_retip -- 1393 * Dump some info on a returned (via ICMP) IP packet. 1394 */ 1395static void 1396pr_retip(ip) 1397 struct ip *ip; 1398{ 1399 u_char *cp; 1400 int hlen; 1401 1402 pr_iph(ip); 1403 hlen = ip->ip_hl << 2; 1404 cp = (u_char *)ip + hlen; 1405 1406 if (ip->ip_p == 6) 1407 (void)printf("TCP: from port %u, to port %u (decimal)\n", 1408 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3))); 1409 else if (ip->ip_p == 17) 1410 (void)printf("UDP: from port %u, to port %u (decimal)\n", 1411 (*cp * 256 + *(cp + 1)), (*(cp + 2) * 256 + *(cp + 3))); 1412} 1413 1414static void 1415fill(bp, patp) 1416 char *bp, *patp; 1417{ 1418 char *cp; 1419 int pat[16]; 1420 u_int ii, jj, kk; 1421 1422 for (cp = patp; *cp; cp++) { 1423 if (!isxdigit(*cp)) 1424 errx(EX_USAGE, 1425 "patterns must be specified as hex digits"); 1426 1427 } 1428 ii = sscanf(patp, 1429 "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x", 1430 &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6], 1431 &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12], 1432 &pat[13], &pat[14], &pat[15]); 1433 1434 if (ii > 0) 1435 for (kk = 0; kk <= MAXPAYLOAD - (PHDR_LEN + ii); kk += ii) 1436 for (jj = 0; jj < ii; ++jj) 1437 bp[jj + kk] = pat[jj]; 1438 if (!(options & F_QUIET)) { 1439 (void)printf("PATTERN: 0x"); 1440 for (jj = 0; jj < ii; ++jj) 1441 (void)printf("%02x", bp[jj] & 0xFF); 1442 (void)printf("\n"); 1443 } 1444} 1445 1446static void 1447usage() 1448{ 1449 (void)fprintf(stderr, "%s\n%s\n%s\n", 1450"usage: ping [-AQRadfnoqrv] [-c count] [-i wait] [-l preload] [-m ttl]", 1451" [-p pattern] " 1452#ifdef IPSEC 1453#ifdef IPSEC_POLICY_IPSEC 1454"[-P policy] " 1455#endif 1456#endif 1457"[-s packetsize] [-S src_addr] [-t timeout]", 1458" [host | [-L] [-I iface] [-T ttl] mcast-group]"); 1459 exit(EX_USAGE); 1460} 1461