1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * 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 38 char copyright[] = 39 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ 40 All rights reserved.\n"; 41 #endif /* not lint */ 42 43 /* 44 * P I N G . C 45 * 46 * Using the InterNet Control Message Protocol (ICMP) "ECHO" facility, 47 * measure round-trip-delays and packet loss across network paths. 48 * 49 * Author - 50 * Mike Muuss 51 * U. S. Army Ballistic Research Laboratory 52 * December, 1983 53 * 54 * Status - 55 * Public Domain. Distribution Unlimited. 56 * Bugs - 57 * More statistics could always be gathered. 58 * This program has to run SUID to ROOT to access the ICMP socket. 59 */ 60 61 #include "ping_common.h" 62 63 #include <netinet/ip.h> 64 #include <linux/icmp.h> 65 #include <sched.h> 66 #include <sys/types.h> 67 #include <private/android_filesystem_config.h> 68 69 #define bzero(b,sz) memset(b, 0, sz) 70 71 /* PING COMMON */ 72 73 int options; 74 75 int sndbuf; 76 int ttl; 77 int rtt; 78 int rtt_addend; 79 __u16 acked; 80 81 int mx_dup_ck = MAX_DUP_CHK; 82 char rcvd_tbl[MAX_DUP_CHK / 8]; 83 84 85 /* counters */ 86 long npackets; /* max packets to transmit */ 87 long nreceived; /* # of packets we got back */ 88 long nrepeats; /* number of duplicates */ 89 long ntransmitted; /* sequence # for outbound packets = #sent */ 90 long nchecksum; /* replies with bad checksum */ 91 long nerrors; /* icmp errors */ 92 int interval = 1000; /* interval between packets (msec) */ 93 int preload; 94 int deadline = 0; /* time to die */ 95 int lingertime = MAXWAIT*1000; 96 struct timeval start_time, cur_time; 97 volatile int exiting; 98 volatile int status_snapshot; 99 int confirm = 0; 100 101 /* Stupid workarounds for bugs/missing functionality in older linuces. 102 * confirm_flag fixes refusing service of kernels without MSG_CONFIRM. 103 * i.e. for linux-2.2 */ 104 int confirm_flag = MSG_CONFIRM; 105 /* And this is workaround for bug in IP_RECVERR on raw sockets which is present 106 * in linux-2.2.[0-19], linux-2.4.[0-7] */ 107 int working_recverr; 108 109 /* timing */ 110 int timing; /* flag to do timing */ 111 long tmin = LONG_MAX; /* minimum round trip time */ 112 long tmax; /* maximum round trip time */ 113 /* Message for rpm maintainers: have _shame_. If you want 114 * to fix something send the patch to me for sanity checking. 115 * "sparcfix" patch is a complete non-sense, apparenly the person 116 * prepared it was stoned. 117 */ 118 long long tsum; /* sum of all times, for doing average */ 119 long long tsum2; 120 int pipesize = -1; 121 122 int datalen = DEFDATALEN; 123 124 char *hostname; 125 int uid; 126 int ident; /* process id to identify our packets */ 127 128 static int screen_width = INT_MAX; 129 130 /* Fills all the outpack, excluding ICMP header, but _including_ 131 * timestamp area with supplied pattern. 132 */ 133 static void fill(char *patp) 134 { 135 int ii, jj, kk; 136 int pat[16]; 137 char *cp; 138 char *bp = outpack+8; 139 140 for (cp = patp; *cp; cp++) { 141 if (!isxdigit(*cp)) { 142 fprintf(stderr, 143 "ping: patterns must be specified as hex digits.\n"); 144 exit(2); 145 } 146 } 147 ii = sscanf(patp, 148 "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x", 149 &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6], 150 &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12], 151 &pat[13], &pat[14], &pat[15]); 152 153 if (ii > 0) { 154 for (kk = 0; kk <= maxpacket - (8 + ii); kk += ii) 155 for (jj = 0; jj < ii; ++jj) 156 bp[jj + kk] = pat[jj]; 157 } 158 if (!(options & F_QUIET)) { 159 printf("PATTERN: 0x"); 160 for (jj = 0; jj < ii; ++jj) 161 printf("%02x", bp[jj] & 0xFF); 162 printf("\n"); 163 } 164 } 165 166 void common_options(int ch) 167 { 168 switch(ch) { 169 case 'a': 170 options |= F_AUDIBLE; 171 break; 172 case 'A': 173 options |= F_ADAPTIVE; 174 break; 175 case 'c': 176 npackets = atoi(optarg); 177 if (npackets <= 0) { 178 fprintf(stderr, "ping: bad number of packets to transmit.\n"); 179 exit(2); 180 } 181 break; 182 case 'd': 183 options |= F_SO_DEBUG; 184 break; 185 case 'f': 186 options |= F_FLOOD; 187 //setbuf(stdout, (char *)NULL); 188 break; 189 case 'i': /* wait between sending packets */ 190 { 191 if (strchr(optarg, '.')) { 192 float t; 193 if (sscanf(optarg, "%f", &t) != 1) { 194 fprintf(stderr, "ping: bad timing interval.\n"); 195 exit(2); 196 } 197 interval = (int)(t*1000); 198 } else if (sscanf(optarg, "%d", &interval) == 1) { 199 interval *= 1000; 200 } else { 201 fprintf(stderr, "ping: bad timing interval.\n"); 202 exit(2); 203 } 204 205 if (interval < 0) { 206 fprintf(stderr, "ping: bad timing interval.\n"); 207 exit(2); 208 } 209 options |= F_INTERVAL; 210 break; 211 } 212 case 'w': 213 deadline = atoi(optarg); 214 if (deadline < 0) { 215 fprintf(stderr, "ping: bad wait time.\n"); 216 exit(2); 217 } 218 break; 219 case 'l': 220 preload = atoi(optarg); 221 if (preload <= 0) { 222 fprintf(stderr, "ping: bad preload value, should be 1..%d\n", mx_dup_ck); 223 exit(2); 224 } 225 if (preload > mx_dup_ck) 226 preload = mx_dup_ck; 227 if (uid && preload > 3) { 228 fprintf(stderr, "ping: cannot set preload to value > 3\n"); 229 exit(2); 230 } 231 break; 232 case 'S': 233 sndbuf = atoi(optarg); 234 if (sndbuf <= 0) { 235 fprintf(stderr, "ping: bad sndbuf value.\n"); 236 exit(2); 237 } 238 break; 239 case 'n': 240 options |= F_NUMERIC; 241 break; 242 case 'p': /* fill buffer with user pattern */ 243 options |= F_PINGFILLED; 244 fill(optarg); 245 break; 246 case 'q': 247 options |= F_QUIET; 248 break; 249 case 'r': 250 options |= F_SO_DONTROUTE; 251 break; 252 case 's': /* size of packet to send */ 253 datalen = atoi(optarg); 254 if (datalen < 0) { 255 fprintf(stderr, "ping: illegal negative packet size %d.\n", datalen); 256 exit(2); 257 } 258 break; 259 case 'v': 260 options |= F_VERBOSE; 261 break; 262 case 'L': 263 options |= F_NOLOOP; 264 break; 265 case 't': 266 options |= F_TTL; 267 ttl = atoi(optarg); 268 if (ttl < 0 || ttl > 255) { 269 fprintf(stderr, "ping: ttl %u out of range\n", ttl); 270 exit(2); 271 } 272 break; 273 case 'U': 274 options |= F_LATENCY; 275 break; 276 case 'B': 277 options |= F_STRICTSOURCE; 278 break; 279 case 'W': 280 lingertime = atoi(optarg); 281 if (lingertime < 0 || lingertime > INT_MAX/1000000) { 282 fprintf(stderr, "ping: bad linger time.\n"); 283 exit(2); 284 } 285 lingertime *= 1000; 286 break; 287 case 'V': 288 printf("ping utility, iputils-ss\n"); 289 exit(0); 290 default: 291 abort(); 292 } 293 } 294 295 296 static void sigexit(int signo) 297 { 298 exiting = 1; 299 } 300 301 static void sigstatus(int signo) 302 { 303 status_snapshot = 1; 304 } 305 306 307 int __schedule_exit(int next) 308 { 309 static unsigned long waittime; 310 struct itimerval it; 311 312 if (waittime) 313 return next; 314 315 if (nreceived) { 316 waittime = 2 * tmax; 317 if (waittime < 1000*interval) 318 waittime = 1000*interval; 319 } else 320 waittime = lingertime*1000; 321 322 if (next < 0 || next < waittime/1000) 323 next = waittime/1000; 324 325 it.it_interval.tv_sec = 0; 326 it.it_interval.tv_usec = 0; 327 it.it_value.tv_sec = waittime/1000000; 328 it.it_value.tv_usec = waittime%1000000; 329 setitimer(ITIMER_REAL, &it, NULL); 330 return next; 331 } 332 333 static inline void update_interval(void) 334 { 335 int est = rtt ? rtt/8 : interval*1000; 336 337 interval = (est+rtt_addend+500)/1000; 338 if (uid && interval < MINUSERINTERVAL) 339 interval = MINUSERINTERVAL; 340 } 341 342 /* 343 * pinger -- 344 * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet 345 * will be added on by the kernel. The ID field is our UNIX process ID, 346 * and the sequence number is an ascending integer. The first 8 bytes 347 * of the data portion are used to hold a UNIX "timeval" struct in VAX 348 * byte-order, to compute the round-trip time. 349 */ 350 int pinger(void) 351 { 352 static int oom_count; 353 static int tokens; 354 int i; 355 356 /* Have we already sent enough? If we have, return an arbitrary positive value. */ 357 if (exiting || (npackets && ntransmitted >= npackets && !deadline)) 358 return 1000; 359 360 /* Check that packets < rate*time + preload */ 361 if (cur_time.tv_sec == 0) { 362 gettimeofday(&cur_time, NULL); 363 tokens = interval*(preload-1); 364 } else { 365 long ntokens; 366 struct timeval tv; 367 368 gettimeofday(&tv, NULL); 369 ntokens = (tv.tv_sec - cur_time.tv_sec)*1000 + 370 (tv.tv_usec-cur_time.tv_usec)/1000; 371 if (!interval) { 372 /* Case of unlimited flood is special; 373 * if we see no reply, they are limited to 100pps */ 374 if (ntokens < MININTERVAL && in_flight() >= preload) 375 return MININTERVAL-ntokens; 376 } 377 ntokens += tokens; 378 if (ntokens > interval*preload) 379 ntokens = interval*preload; 380 if (ntokens < interval) 381 return interval - ntokens; 382 383 cur_time = tv; 384 tokens = ntokens - interval; 385 } 386 387 resend: 388 i = send_probe(); 389 390 if (i == 0) { 391 oom_count = 0; 392 advance_ntransmitted(); 393 if (!(options & F_QUIET) && (options & F_FLOOD)) { 394 /* Very silly, but without this output with 395 * high preload or pipe size is very confusing. */ 396 if ((preload < screen_width && pipesize < screen_width) || 397 in_flight() < screen_width) 398 write(STDOUT_FILENO, ".", 1); 399 } 400 return interval - tokens; 401 } 402 403 /* And handle various errors... */ 404 if (i > 0) { 405 /* Apparently, it is some fatal bug. */ 406 abort(); 407 } else if (errno == ENOBUFS || errno == ENOMEM) { 408 int nores_interval; 409 410 /* Device queue overflow or OOM. Packet is not sent. */ 411 tokens = 0; 412 /* Slowdown. This works only in adaptive mode (option -A) */ 413 rtt_addend += (rtt < 8*50000 ? rtt/8 : 50000); 414 if (options&F_ADAPTIVE) 415 update_interval(); 416 nores_interval = SCHINT(interval/2); 417 if (nores_interval > 500) 418 nores_interval = 500; 419 oom_count++; 420 if (oom_count*nores_interval < lingertime) 421 return nores_interval; 422 i = 0; 423 /* Fall to hard error. It is to avoid complete deadlock 424 * on stuck output device even when dealine was not requested. 425 * Expected timings are screwed up in any case, but we will 426 * exit some day. :-) */ 427 } else if (errno == EAGAIN) { 428 /* Socket buffer is full. */ 429 tokens += interval; 430 return MININTERVAL; 431 } else { 432 if ((i=receive_error_msg()) > 0) { 433 /* An ICMP error arrived. */ 434 tokens += interval; 435 return MININTERVAL; 436 } 437 /* Compatibility with old linuces. */ 438 if (i == 0 && confirm_flag && errno == EINVAL) { 439 confirm_flag = 0; 440 errno = 0; 441 } 442 if (!errno) 443 goto resend; 444 } 445 446 /* Hard local error. Pretend we sent packet. */ 447 advance_ntransmitted(); 448 449 if (i == 0 && !(options & F_QUIET)) { 450 if (options & F_FLOOD) 451 write(STDOUT_FILENO, "E", 1); 452 else 453 perror("ping: sendmsg"); 454 } 455 tokens = 0; 456 return SCHINT(interval); 457 } 458 459 /* Set socket buffers, "alloc" is an estimate of memory taken by single packet. */ 460 461 void sock_setbufs(int icmp_sock, int alloc) 462 { 463 int rcvbuf, hold; 464 int tmplen = sizeof(hold); 465 466 if (!sndbuf) 467 sndbuf = alloc; 468 setsockopt(icmp_sock, SOL_SOCKET, SO_SNDBUF, (char *)&sndbuf, sizeof(sndbuf)); 469 470 rcvbuf = hold = alloc * preload; 471 if (hold < 65536) 472 hold = 65536; 473 setsockopt(icmp_sock, SOL_SOCKET, SO_RCVBUF, (char *)&hold, sizeof(hold)); 474 if (getsockopt(icmp_sock, SOL_SOCKET, SO_RCVBUF, (char *)&hold, &tmplen) == 0) { 475 if (hold < rcvbuf) 476 fprintf(stderr, "WARNING: probably, rcvbuf is not enough to hold preload.\n"); 477 } 478 } 479 480 /* Protocol independent setup and parameter checks. */ 481 482 void setup(int icmp_sock) 483 { 484 int hold; 485 struct timeval tv; 486 487 if ((options & F_FLOOD) && !(options & F_INTERVAL)) 488 interval = 0; 489 490 if (uid && interval < MINUSERINTERVAL) { 491 fprintf(stderr, "ping: cannot flood; minimal interval, allowed for user, is %dms\n", MINUSERINTERVAL); 492 exit(2); 493 } 494 495 if (interval >= INT_MAX/preload) { 496 fprintf(stderr, "ping: illegal preload and/or interval\n"); 497 exit(2); 498 } 499 500 hold = 1; 501 if (options & F_SO_DEBUG) 502 setsockopt(icmp_sock, SOL_SOCKET, SO_DEBUG, (char *)&hold, sizeof(hold)); 503 if (options & F_SO_DONTROUTE) 504 setsockopt(icmp_sock, SOL_SOCKET, SO_DONTROUTE, (char *)&hold, sizeof(hold)); 505 506 #ifdef SO_TIMESTAMP 507 if (!(options&F_LATENCY)) { 508 int on = 1; 509 if (setsockopt(icmp_sock, SOL_SOCKET, SO_TIMESTAMP, &on, sizeof(on))) 510 fprintf(stderr, "Warning: no SO_TIMESTAMP support, falling back to SIOCGSTAMP\n"); 511 } 512 #endif 513 514 /* Set some SNDTIMEO to prevent blocking forever 515 * on sends, when device is too slow or stalls. Just put limit 516 * of one second, or "interval", if it is less. 517 */ 518 tv.tv_sec = 1; 519 tv.tv_usec = 0; 520 if (interval < 1000) { 521 tv.tv_sec = 0; 522 tv.tv_usec = 1000 * SCHINT(interval); 523 } 524 setsockopt(icmp_sock, SOL_SOCKET, SO_SNDTIMEO, (char*)&tv, sizeof(tv)); 525 526 /* Set RCVTIMEO to "interval". Note, it is just an optimization 527 * allowing to avoid redundant poll(). */ 528 tv.tv_sec = SCHINT(interval)/1000; 529 tv.tv_usec = 1000*(SCHINT(interval)%1000); 530 if (setsockopt(icmp_sock, SOL_SOCKET, SO_RCVTIMEO, (char*)&tv, sizeof(tv))) 531 options |= F_FLOOD_POLL; 532 533 if (!(options & F_PINGFILLED)) { 534 int i; 535 char *p = outpack+8; 536 537 /* Do not forget about case of small datalen, 538 * fill timestamp area too! 539 */ 540 for (i = 0; i < datalen; ++i) 541 *p++ = i; 542 } 543 544 ident = getpid() & 0xFFFF; 545 546 set_signal(SIGINT, sigexit); 547 set_signal(SIGALRM, sigexit); 548 set_signal(SIGQUIT, sigstatus); 549 550 gettimeofday(&start_time, NULL); 551 552 if (deadline) { 553 struct itimerval it; 554 555 it.it_interval.tv_sec = 0; 556 it.it_interval.tv_usec = 0; 557 it.it_value.tv_sec = deadline; 558 it.it_value.tv_usec = 0; 559 setitimer(ITIMER_REAL, &it, NULL); 560 } 561 562 #if 0 563 if (isatty(STDOUT_FILENO)) { 564 struct winsize w; 565 566 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) != -1) { 567 if (w.ws_col > 0) 568 screen_width = w.ws_col; 569 } 570 } 571 #endif 572 } 573 574 void main_loop(int icmp_sock, __u8 *packet, int packlen) 575 { 576 char addrbuf[128]; 577 char ans_data[4096]; 578 struct iovec iov; 579 struct msghdr msg; 580 struct cmsghdr *c; 581 int cc; 582 int next; 583 int polling; 584 585 iov.iov_base = (char *)packet; 586 587 for (;;) { 588 /* Check exit conditions. */ 589 if (exiting) 590 break; 591 if (npackets && nreceived + nerrors >= npackets) 592 break; 593 if (deadline && nerrors) 594 break; 595 /* Check for and do special actions. */ 596 if (status_snapshot) 597 status(); 598 599 /* Send probes scheduled to this time. */ 600 do { 601 next = pinger(); 602 next = schedule_exit(next); 603 } while (next <= 0); 604 605 /* "next" is time to send next probe, if positive. 606 * If next<=0 send now or as soon as possible. */ 607 608 /* Technical part. Looks wicked. Could be dropped, 609 * if everyone used the newest kernel. :-) 610 * Its purpose is: 611 * 1. Provide intervals less than resolution of scheduler. 612 * Solution: spinning. 613 * 2. Avoid use of poll(), when recvmsg() can provide 614 * timed waiting (SO_RCVTIMEO). */ 615 polling = 0; 616 if ((options & (F_ADAPTIVE|F_FLOOD_POLL)) || next<SCHINT(interval)) { 617 int recv_expected = in_flight(); 618 619 /* If we are here, recvmsg() is unable to wait for 620 * required timeout. */ 621 if (1000*next <= 1000000/(int)HZ) { 622 /* Very short timeout... So, if we wait for 623 * something, we sleep for MININTERVAL. 624 * Otherwise, spin! */ 625 if (recv_expected) { 626 next = MININTERVAL; 627 } else { 628 next = 0; 629 /* When spinning, no reasons to poll. 630 * Use nonblocking recvmsg() instead. */ 631 polling = MSG_DONTWAIT; 632 /* But yield yet. */ 633 sched_yield(); 634 } 635 } 636 637 if (!polling && 638 ((options & (F_ADAPTIVE|F_FLOOD_POLL)) || interval)) { 639 struct pollfd pset; 640 pset.fd = icmp_sock; 641 pset.events = POLLIN|POLLERR; 642 pset.revents = 0; 643 if (poll(&pset, 1, next) < 1 || 644 !(pset.revents&(POLLIN|POLLERR))) 645 continue; 646 polling = MSG_DONTWAIT; 647 } 648 } 649 650 for (;;) { 651 struct timeval *recv_timep = NULL; 652 struct timeval recv_time; 653 int not_ours = 0; /* Raw socket can receive messages 654 * destined to other running pings. */ 655 656 iov.iov_len = packlen; 657 msg.msg_name = addrbuf; 658 msg.msg_namelen = sizeof(addrbuf); 659 msg.msg_iov = &iov; 660 msg.msg_iovlen = 1; 661 msg.msg_control = ans_data; 662 msg.msg_controllen = sizeof(ans_data); 663 664 cc = recvmsg(icmp_sock, &msg, polling); 665 polling = MSG_DONTWAIT; 666 667 if (cc < 0) { 668 if (errno == EAGAIN || errno == EINTR) 669 break; 670 if (!receive_error_msg()) { 671 if (errno) { 672 perror("ping: recvmsg"); 673 break; 674 } 675 not_ours = 1; 676 } 677 } else { 678 679 #ifdef SO_TIMESTAMP 680 for (c = CMSG_FIRSTHDR(&msg); c; c = CMSG_NXTHDR(&msg, c)) { 681 if (c->cmsg_level != SOL_SOCKET || 682 c->cmsg_type != SO_TIMESTAMP) 683 continue; 684 if (c->cmsg_len < CMSG_LEN(sizeof(struct timeval))) 685 continue; 686 recv_timep = (struct timeval*)CMSG_DATA(c); 687 } 688 #endif 689 690 if ((options&F_LATENCY) || recv_timep == NULL) { 691 if ((options&F_LATENCY) || 692 ioctl(icmp_sock, SIOCGSTAMP, &recv_time)) 693 gettimeofday(&recv_time, NULL); 694 recv_timep = &recv_time; 695 } 696 697 not_ours = parse_reply(&msg, cc, addrbuf, recv_timep); 698 } 699 700 /* See? ... someone runs another ping on this host. */ 701 if (not_ours) 702 install_filter(); 703 704 /* If nothing is in flight, "break" returns us to pinger. */ 705 if (in_flight() == 0) 706 break; 707 708 /* Otherwise, try to recvmsg() again. recvmsg() 709 * is nonblocking after the first iteration, so that 710 * if nothing is queued, it will receive EAGAIN 711 * and return to pinger. */ 712 } 713 } 714 finish(); 715 } 716 717 int gather_statistics(__u8 *ptr, int cc, __u16 seq, int hops, 718 int csfailed, struct timeval *tv, char *from) 719 { 720 int dupflag = 0; 721 long triptime = 0; 722 723 ++nreceived; 724 if (!csfailed) 725 acknowledge(seq); 726 727 if (timing && cc >= 8+sizeof(struct timeval)) { 728 struct timeval tmp_tv; 729 memcpy(&tmp_tv, ptr, sizeof(tmp_tv)); 730 731 restamp: 732 tvsub(tv, &tmp_tv); 733 triptime = tv->tv_sec * 1000000 + tv->tv_usec; 734 if (triptime < 0) { 735 fprintf(stderr, "Warning: time of day goes back (%ldus), taking countermeasures.\n", triptime); 736 triptime = 0; 737 if (!(options & F_LATENCY)) { 738 gettimeofday(tv, NULL); 739 options |= F_LATENCY; 740 goto restamp; 741 } 742 } 743 if (!csfailed) { 744 tsum += triptime; 745 tsum2 += (long long)triptime * (long long)triptime; 746 if (triptime < tmin) 747 tmin = triptime; 748 if (triptime > tmax) 749 tmax = triptime; 750 if (!rtt) 751 rtt = triptime*8; 752 else 753 rtt += triptime-rtt/8; 754 if (options&F_ADAPTIVE) 755 update_interval(); 756 } 757 } 758 759 if (csfailed) { 760 ++nchecksum; 761 --nreceived; 762 } else if (TST(seq % mx_dup_ck)) { 763 ++nrepeats; 764 --nreceived; 765 dupflag = 1; 766 } else { 767 SET(seq % mx_dup_ck); 768 dupflag = 0; 769 } 770 confirm = confirm_flag; 771 772 if (options & F_QUIET) 773 return 1; 774 775 if (options & F_FLOOD) { 776 if (!csfailed) 777 write(STDOUT_FILENO, "\b \b", 3); 778 else 779 write(STDOUT_FILENO, "\bC", 1); 780 } else { 781 int i; 782 __u8 *cp, *dp; 783 printf("%d bytes from %s: icmp_seq=%u", cc, from, seq); 784 785 if (hops >= 0) 786 printf(" ttl=%d", hops); 787 788 if (cc < datalen+8) { 789 printf(" (truncated)\n"); 790 return 1; 791 } 792 if (timing) { 793 if (triptime >= 100000) 794 printf(" time=%ld ms", triptime/1000); 795 else if (triptime >= 10000) 796 printf(" time=%ld.%01ld ms", triptime/1000, 797 (triptime%1000)/100); 798 else if (triptime >= 1000) 799 printf(" time=%ld.%02ld ms", triptime/1000, 800 (triptime%1000)/10); 801 else 802 printf(" time=%ld.%03ld ms", triptime/1000, 803 triptime%1000); 804 } 805 if (dupflag) 806 printf(" (DUP!)"); 807 if (csfailed) 808 printf(" (BAD CHECKSUM!)"); 809 810 /* check the data */ 811 cp = ((u_char*)ptr) + sizeof(struct timeval); 812 dp = &outpack[8 + sizeof(struct timeval)]; 813 for (i = sizeof(struct timeval); i < datalen; ++i, ++cp, ++dp) { 814 if (*cp != *dp) { 815 printf("\nwrong data byte #%d should be 0x%x but was 0x%x", 816 i, *dp, *cp); 817 cp = (u_char*)ptr + sizeof(struct timeval); 818 for (i = sizeof(struct timeval); i < datalen; ++i, ++cp) { 819 if ((i % 32) == sizeof(struct timeval)) 820 printf("\n#%d\t", i); 821 printf("%x ", *cp); 822 } 823 break; 824 } 825 } 826 } 827 return 0; 828 } 829 830 static long llsqrt(long long a) 831 { 832 long long prev = ~((long long)1 << 63); 833 long long x = a; 834 835 if (x > 0) { 836 while (x < prev) { 837 prev = x; 838 x = (x+(a/x))/2; 839 } 840 } 841 842 return (long)x; 843 } 844 845 /* 846 * finish -- 847 * Print out statistics, and give up. 848 */ 849 void finish(void) 850 { 851 struct timeval tv = cur_time; 852 853 tvsub(&tv, &start_time); 854 855 putchar('\n'); 856 fflush(stdout); 857 printf("--- %s ping statistics ---\n", hostname); 858 printf("%ld packets transmitted, ", ntransmitted); 859 printf("%ld received", nreceived); 860 if (nrepeats) 861 printf(", +%ld duplicates", nrepeats); 862 if (nchecksum) 863 printf(", +%ld corrupted", nchecksum); 864 if (nerrors) 865 printf(", +%ld errors", nerrors); 866 if (ntransmitted) { 867 printf(", %d%% packet loss", 868 (int) ((((long long)(ntransmitted - nreceived)) * 100) / 869 ntransmitted)); 870 printf(", time %ldms", 1000*tv.tv_sec+tv.tv_usec/1000); 871 } 872 putchar('\n'); 873 874 if (nreceived && timing) { 875 long tmdev; 876 877 tsum /= nreceived + nrepeats; 878 tsum2 /= nreceived + nrepeats; 879 tmdev = llsqrt(tsum2 - tsum * tsum); 880 881 printf("rtt min/avg/max/mdev = %ld.%03ld/%lu.%03ld/%ld.%03ld/%ld.%03ld ms", 882 tmin/1000, tmin%1000, 883 (unsigned long)(tsum/1000), (long)(tsum%1000), 884 tmax/1000, tmax%1000, 885 tmdev/1000, tmdev%1000 886 ); 887 } 888 if (pipesize > 1) 889 printf(", pipe %d", pipesize); 890 if (ntransmitted > 1 && (!interval || (options&(F_FLOOD|F_ADAPTIVE)))) { 891 int ipg = (1000000*(long long)tv.tv_sec+tv.tv_usec)/(ntransmitted-1); 892 printf(", ipg/ewma %d.%03d/%d.%03d ms", 893 ipg/1000, ipg%1000, rtt/8000, (rtt/8)%1000); 894 } 895 putchar('\n'); 896 exit(!nreceived || (deadline && nreceived < npackets)); 897 } 898 899 900 void status(void) 901 { 902 int loss = 0; 903 long tavg = 0; 904 905 status_snapshot = 0; 906 907 if (ntransmitted) 908 loss = (((long long)(ntransmitted - nreceived)) * 100) / ntransmitted; 909 910 fprintf(stderr, "\r%ld/%ld packets, %d%% loss", ntransmitted, nreceived, loss); 911 912 if (nreceived && timing) { 913 tavg = tsum / (nreceived + nrepeats); 914 915 fprintf(stderr, ", min/avg/ewma/max = %ld.%03ld/%lu.%03ld/%d.%03d/%ld.%03ld ms", 916 tmin/1000, tmin%1000, 917 tavg/1000, tavg%1000, 918 rtt/8000, (rtt/8)%1000, 919 tmax/1000, tmax%1000 920 ); 921 } 922 fprintf(stderr, "\n"); 923 } 924 925 /* PING COMMON */ 926 927 #define MAXIPLEN 60 928 #define MAXICMPLEN 76 929 #define NROUTES 9 /* number of record route slots */ 930 #define TOS_MAX 255 /* 8-bit TOS field */ 931 932 933 static int ts_type; 934 static int nroute = 0; 935 static __u32 route[10]; 936 937 938 939 struct sockaddr_in whereto; /* who to ping */ 940 int optlen = 0; 941 int settos = 0; /* Set TOS, Precendence or other QOS options */ 942 int icmp_sock; /* socket file descriptor */ 943 u_char outpack[0x10000]; 944 int maxpacket = sizeof(outpack); 945 946 static int broadcast_pings = 0; 947 948 static char *pr_addr(__u32); 949 static void pr_options(unsigned char * cp, int hlen); 950 static void pr_iph(struct iphdr *ip); 951 static void usage(void) __attribute__((noreturn)); 952 static u_short in_cksum(const u_short *addr, int len, u_short salt); 953 static void pr_icmph(__u8 type, __u8 code, __u32 info, struct icmphdr *icp); 954 static int parsetos(char *str); 955 956 static struct { 957 struct cmsghdr cm; 958 struct in_pktinfo ipi; 959 } cmsg = { {sizeof(struct cmsghdr) + sizeof(struct in_pktinfo), SOL_IP, IP_PKTINFO}, 960 {0, }}; 961 int cmsg_len; 962 963 struct sockaddr_in source; 964 char *device; 965 int pmtudisc = -1; 966 967 int receive_error_msg() 968 { 969 int res; 970 char cbuf[512]; 971 struct iovec iov; 972 struct msghdr msg; 973 struct cmsghdr *cmsg; 974 struct sock_extended_err *e; 975 struct icmphdr icmph; 976 struct sockaddr_in target; 977 int net_errors = 0; 978 int local_errors = 0; 979 int saved_errno = errno; 980 981 iov.iov_base = &icmph; 982 iov.iov_len = sizeof(icmph); 983 msg.msg_name = (void*)⌖ 984 msg.msg_namelen = sizeof(target); 985 msg.msg_iov = &iov; 986 msg.msg_iovlen = 1; 987 msg.msg_flags = 0; 988 msg.msg_control = cbuf; 989 msg.msg_controllen = sizeof(cbuf); 990 991 res = recvmsg(icmp_sock, &msg, MSG_ERRQUEUE|MSG_DONTWAIT); 992 if (res < 0) 993 goto out; 994 995 e = NULL; 996 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) { 997 if (cmsg->cmsg_level == SOL_IP) { 998 if (cmsg->cmsg_type == IP_RECVERR) 999 e = (struct sock_extended_err *)CMSG_DATA(cmsg); 1000 } 1001 } 1002 if (e == NULL) 1003 abort(); 1004 1005 if (e->ee_origin == SO_EE_ORIGIN_LOCAL) { 1006 local_errors++; 1007 if (options & F_QUIET) 1008 goto out; 1009 if (options & F_FLOOD) 1010 write(STDOUT_FILENO, "E", 1); 1011 else if (e->ee_errno != EMSGSIZE) 1012 fprintf(stderr, "ping: local error: %s\n", strerror(e->ee_errno)); 1013 else 1014 fprintf(stderr, "ping: local error: Message too long, mtu=%u\n", e->ee_info); 1015 nerrors++; 1016 } else if (e->ee_origin == SO_EE_ORIGIN_ICMP) { 1017 struct sockaddr_in *sin = (struct sockaddr_in*)(e+1); 1018 1019 if (res < sizeof(icmph) || 1020 target.sin_addr.s_addr != whereto.sin_addr.s_addr || 1021 icmph.type != ICMP_ECHO || 1022 icmph.un.echo.id != ident) { 1023 /* Not our error, not an error at all. Clear. */ 1024 saved_errno = 0; 1025 goto out; 1026 } 1027 1028 acknowledge(ntohs(icmph.un.echo.sequence)); 1029 1030 if (!working_recverr) { 1031 struct icmp_filter filt; 1032 working_recverr = 1; 1033 /* OK, it works. Add stronger filter. */ 1034 filt.data = ~((1<<ICMP_SOURCE_QUENCH)| 1035 (1<<ICMP_REDIRECT)| 1036 (1<<ICMP_ECHOREPLY)); 1037 if (setsockopt(icmp_sock, SOL_RAW, ICMP_FILTER, (char*)&filt, sizeof(filt)) == -1) 1038 perror("\rWARNING: setsockopt(ICMP_FILTER)"); 1039 } 1040 1041 net_errors++; 1042 nerrors++; 1043 if (options & F_QUIET) 1044 goto out; 1045 if (options & F_FLOOD) { 1046 write(STDOUT_FILENO, "\bE", 2); 1047 } else { 1048 printf("From %s icmp_seq=%u ", pr_addr(sin->sin_addr.s_addr), ntohs(icmph.un.echo.sequence)); 1049 pr_icmph(e->ee_type, e->ee_code, e->ee_info, NULL); 1050 fflush(stdout); 1051 } 1052 } 1053 1054 out: 1055 errno = saved_errno; 1056 return net_errors ? : -local_errors; 1057 } 1058 1059 /* 1060 * pinger -- 1061 * Compose and transmit an ICMP ECHO REQUEST packet. The IP packet 1062 * will be added on by the kernel. The ID field is our UNIX process ID, 1063 * and the sequence number is an ascending integer. The first 8 bytes 1064 * of the data portion are used to hold a UNIX "timeval" struct in VAX 1065 * byte-order, to compute the round-trip time. 1066 */ 1067 int send_probe() 1068 { 1069 struct icmphdr *icp; 1070 int cc; 1071 int i; 1072 1073 icp = (struct icmphdr *)outpack; 1074 icp->type = ICMP_ECHO; 1075 icp->code = 0; 1076 icp->checksum = 0; 1077 icp->un.echo.sequence = htons(ntransmitted+1); 1078 icp->un.echo.id = ident; /* ID */ 1079 1080 CLR((ntransmitted+1) % mx_dup_ck); 1081 1082 if (timing) { 1083 if (options&F_LATENCY) { 1084 static volatile int fake_fucked_egcs = sizeof(struct timeval); 1085 struct timeval tmp_tv; 1086 gettimeofday(&tmp_tv, NULL); 1087 /* egcs is crap or glibc is crap, but memcpy 1088 does not copy anything, if len is constant! */ 1089 memcpy(icp+1, &tmp_tv, fake_fucked_egcs); 1090 } else { 1091 memset(icp+1, 0, sizeof(struct timeval)); 1092 } 1093 } 1094 1095 cc = datalen + 8; /* skips ICMP portion */ 1096 1097 /* compute ICMP checksum here */ 1098 icp->checksum = in_cksum((u_short *)icp, cc, 0); 1099 1100 if (timing && !(options&F_LATENCY)) { 1101 static volatile int fake_fucked_egcs = sizeof(struct timeval); 1102 struct timeval tmp_tv; 1103 gettimeofday(&tmp_tv, NULL); 1104 /* egcs is crap or glibc is crap, but memcpy 1105 does not copy anything, if len is constant! */ 1106 memcpy(icp+1, &tmp_tv, fake_fucked_egcs); 1107 icp->checksum = in_cksum((u_short *)(icp+1), fake_fucked_egcs, ~icp->checksum); 1108 } 1109 1110 do { 1111 static struct iovec iov = {outpack, 0}; 1112 static struct msghdr m = { &whereto, sizeof(whereto), 1113 &iov, 1, &cmsg, 0, 0 }; 1114 m.msg_controllen = cmsg_len; 1115 iov.iov_len = cc; 1116 1117 i = sendmsg(icmp_sock, &m, confirm); 1118 confirm = 0; 1119 } while (0); 1120 1121 return (cc == i ? 0 : i); 1122 } 1123 1124 /* 1125 * parse_reply -- 1126 * Print out the packet, if it came from us. This logic is necessary 1127 * because ALL readers of the ICMP socket get a copy of ALL ICMP packets 1128 * which arrive ('tis only fair). This permits multiple copies of this 1129 * program to be run without having intermingled output (or statistics!). 1130 */ 1131 int 1132 parse_reply(struct msghdr *msg, int cc, void *addr, struct timeval *tv) 1133 { 1134 struct sockaddr_in *from = addr; 1135 __u8 *buf = msg->msg_iov->iov_base; 1136 struct icmphdr *icp; 1137 struct iphdr *ip; 1138 int hlen; 1139 int csfailed; 1140 1141 /* Check the IP header */ 1142 ip = (struct iphdr *)buf; 1143 hlen = ip->ihl*4; 1144 if (cc < hlen + 8 || ip->ihl < 5) { 1145 if (options & F_VERBOSE) 1146 fprintf(stderr, "ping: packet too short (%d bytes) from %s\n", cc, 1147 pr_addr(from->sin_addr.s_addr)); 1148 return 1; 1149 } 1150 1151 /* Now the ICMP part */ 1152 cc -= hlen; 1153 icp = (struct icmphdr *)(buf + hlen); 1154 csfailed = in_cksum((u_short *)icp, cc, 0); 1155 1156 if (icp->type == ICMP_ECHOREPLY) { 1157 if (icp->un.echo.id != ident) 1158 return 1; /* 'Twas not our ECHO */ 1159 if (gather_statistics((__u8*)(icp+1), cc, 1160 ntohs(icp->un.echo.sequence), 1161 ip->ttl, 0, tv, pr_addr(from->sin_addr.s_addr))) 1162 return 0; 1163 } else { 1164 /* We fall here when a redirect or source quench arrived. 1165 * Also this branch processes icmp errors, when IP_RECVERR 1166 * is broken. */ 1167 1168 switch (icp->type) { 1169 case ICMP_ECHO: 1170 /* MUST NOT */ 1171 return 1; 1172 case ICMP_SOURCE_QUENCH: 1173 case ICMP_REDIRECT: 1174 case ICMP_DEST_UNREACH: 1175 case ICMP_TIME_EXCEEDED: 1176 case ICMP_PARAMETERPROB: 1177 { 1178 struct iphdr * iph = (struct iphdr *)(&icp[1]); 1179 struct icmphdr *icp1 = (struct icmphdr*)((unsigned char *)iph + iph->ihl*4); 1180 int error_pkt; 1181 if (cc < 8+sizeof(struct iphdr)+8 || 1182 cc < 8+iph->ihl*4+8) 1183 return 1; 1184 if (icp1->type != ICMP_ECHO || 1185 iph->daddr != whereto.sin_addr.s_addr || 1186 icp1->un.echo.id != ident) 1187 return 1; 1188 error_pkt = (icp->type != ICMP_REDIRECT && 1189 icp->type != ICMP_SOURCE_QUENCH); 1190 if (error_pkt) { 1191 acknowledge(ntohs(icp1->un.echo.sequence)); 1192 if (working_recverr) { 1193 return 0; 1194 } else { 1195 static int once; 1196 /* Sigh, IP_RECVERR for raw socket 1197 * was broken until 2.4.9. So, we ignore 1198 * the first error and warn on the second. 1199 */ 1200 if (once++ == 1) 1201 fprintf(stderr, "\rWARNING: kernel is not very fresh, upgrade is recommended.\n"); 1202 if (once == 1) 1203 return 0; 1204 } 1205 } 1206 nerrors+=error_pkt; 1207 if (options&F_QUIET) 1208 return !error_pkt; 1209 if (options & F_FLOOD) { 1210 if (error_pkt) 1211 write(STDOUT_FILENO, "\bE", 2); 1212 return !error_pkt; 1213 } 1214 printf("From %s: icmp_seq=%u ", 1215 pr_addr(from->sin_addr.s_addr), 1216 ntohs(icp1->un.echo.sequence)); 1217 if (csfailed) 1218 printf("(BAD CHECKSUM)"); 1219 pr_icmph(icp->type, icp->code, ntohl(icp->un.gateway), icp); 1220 return !error_pkt; 1221 } 1222 default: 1223 /* MUST NOT */ 1224 break; 1225 } 1226 if ((options & F_FLOOD) && !(options & (F_VERBOSE|F_QUIET))) { 1227 if (!csfailed) 1228 write(STDOUT_FILENO, "!E", 2); 1229 else 1230 write(STDOUT_FILENO, "!EC", 3); 1231 return 0; 1232 } 1233 if (!(options & F_VERBOSE) || uid) 1234 return 0; 1235 printf("From %s: ", pr_addr(from->sin_addr.s_addr)); 1236 if (csfailed) { 1237 printf("(BAD CHECKSUM)\n"); 1238 return 0; 1239 } 1240 pr_icmph(icp->type, icp->code, ntohl(icp->un.gateway), icp); 1241 return 0; 1242 } 1243 1244 if (!(options & F_FLOOD)) { 1245 pr_options(buf + sizeof(struct iphdr), hlen); 1246 1247 if (options & F_AUDIBLE) 1248 putchar('\a'); 1249 putchar('\n'); 1250 fflush(stdout); 1251 } 1252 return 0; 1253 } 1254 1255 u_short 1256 in_cksum(const u_short *addr, register int len, u_short csum) 1257 { 1258 register int nleft = len; 1259 const u_short *w = addr; 1260 register u_short answer; 1261 register int sum = csum; 1262 1263 /* 1264 * Our algorithm is simple, using a 32 bit accumulator (sum), 1265 * we add sequential 16 bit words to it, and at the end, fold 1266 * back all the carry bits from the top 16 bits into the lower 1267 * 16 bits. 1268 */ 1269 while (nleft > 1) { 1270 sum += *w++; 1271 nleft -= 2; 1272 } 1273 1274 /* mop up an odd byte, if necessary */ 1275 if (nleft == 1) 1276 sum += htons(*(u_char *)w << 8); 1277 1278 /* 1279 * add back carry outs from top 16 bits to low 16 bits 1280 */ 1281 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ 1282 sum += (sum >> 16); /* add carry */ 1283 answer = ~sum; /* truncate to 16 bits */ 1284 return (answer); 1285 } 1286 1287 /* 1288 * pr_icmph -- 1289 * Print a descriptive string about an ICMP header. 1290 */ 1291 void pr_icmph(__u8 type, __u8 code, __u32 info, struct icmphdr *icp) 1292 { 1293 switch(type) { 1294 case ICMP_ECHOREPLY: 1295 printf("Echo Reply\n"); 1296 /* XXX ID + Seq + Data */ 1297 break; 1298 case ICMP_DEST_UNREACH: 1299 switch(code) { 1300 case ICMP_NET_UNREACH: 1301 printf("Destination Net Unreachable\n"); 1302 break; 1303 case ICMP_HOST_UNREACH: 1304 printf("Destination Host Unreachable\n"); 1305 break; 1306 case ICMP_PROT_UNREACH: 1307 printf("Destination Protocol Unreachable\n"); 1308 break; 1309 case ICMP_PORT_UNREACH: 1310 printf("Destination Port Unreachable\n"); 1311 break; 1312 case ICMP_FRAG_NEEDED: 1313 printf("Frag needed and DF set (mtu = %u)\n", info); 1314 break; 1315 case ICMP_SR_FAILED: 1316 printf("Source Route Failed\n"); 1317 break; 1318 case ICMP_PKT_FILTERED: 1319 printf("Packet filtered\n"); 1320 break; 1321 default: 1322 printf("Dest Unreachable, Bad Code: %d\n", code); 1323 break; 1324 } 1325 if (icp && (options & F_VERBOSE)) 1326 pr_iph((struct iphdr*)(icp + 1)); 1327 break; 1328 case ICMP_SOURCE_QUENCH: 1329 printf("Source Quench\n"); 1330 if (icp && (options & F_VERBOSE)) 1331 pr_iph((struct iphdr*)(icp + 1)); 1332 break; 1333 case ICMP_REDIRECT: 1334 switch(code) { 1335 case ICMP_REDIR_NET: 1336 printf("Redirect Network"); 1337 break; 1338 case ICMP_REDIR_HOST: 1339 printf("Redirect Host"); 1340 break; 1341 case ICMP_REDIR_NETTOS: 1342 printf("Redirect Type of Service and Network"); 1343 break; 1344 case ICMP_REDIR_HOSTTOS: 1345 printf("Redirect Type of Service and Host"); 1346 break; 1347 default: 1348 printf("Redirect, Bad Code: %d", code); 1349 break; 1350 } 1351 if (icp) 1352 printf("(New nexthop: %s)\n", pr_addr(icp->un.gateway)); 1353 if (icp && (options & F_VERBOSE)) 1354 pr_iph((struct iphdr*)(icp + 1)); 1355 break; 1356 case ICMP_ECHO: 1357 printf("Echo Request\n"); 1358 /* XXX ID + Seq + Data */ 1359 break; 1360 case ICMP_TIME_EXCEEDED: 1361 switch(code) { 1362 case ICMP_EXC_TTL: 1363 printf("Time to live exceeded\n"); 1364 break; 1365 case ICMP_EXC_FRAGTIME: 1366 printf("Frag reassembly time exceeded\n"); 1367 break; 1368 default: 1369 printf("Time exceeded, Bad Code: %d\n", code); 1370 break; 1371 } 1372 if (icp && (options & F_VERBOSE)) 1373 pr_iph((struct iphdr*)(icp + 1)); 1374 break; 1375 case ICMP_PARAMETERPROB: 1376 printf("Parameter problem: pointer = %u\n", icp ? (ntohl(icp->un.gateway)>>24) : info); 1377 if (icp && (options & F_VERBOSE)) 1378 pr_iph((struct iphdr*)(icp + 1)); 1379 break; 1380 case ICMP_TIMESTAMP: 1381 printf("Timestamp\n"); 1382 /* XXX ID + Seq + 3 timestamps */ 1383 break; 1384 case ICMP_TIMESTAMPREPLY: 1385 printf("Timestamp Reply\n"); 1386 /* XXX ID + Seq + 3 timestamps */ 1387 break; 1388 case ICMP_INFO_REQUEST: 1389 printf("Information Request\n"); 1390 /* XXX ID + Seq */ 1391 break; 1392 case ICMP_INFO_REPLY: 1393 printf("Information Reply\n"); 1394 /* XXX ID + Seq */ 1395 break; 1396 #ifdef ICMP_MASKREQ 1397 case ICMP_MASKREQ: 1398 printf("Address Mask Request\n"); 1399 break; 1400 #endif 1401 #ifdef ICMP_MASKREPLY 1402 case ICMP_MASKREPLY: 1403 printf("Address Mask Reply\n"); 1404 break; 1405 #endif 1406 default: 1407 printf("Bad ICMP type: %d\n", type); 1408 } 1409 } 1410 1411 void pr_options(unsigned char * cp, int hlen) 1412 { 1413 int i, j; 1414 int optlen, totlen; 1415 unsigned char * optptr; 1416 static int old_rrlen; 1417 static char old_rr[MAX_IPOPTLEN]; 1418 1419 totlen = hlen-sizeof(struct iphdr); 1420 optptr = cp; 1421 1422 while (totlen > 0) { 1423 if (*optptr == IPOPT_EOL) 1424 break; 1425 if (*optptr == IPOPT_NOP) { 1426 totlen--; 1427 optptr++; 1428 printf("\nNOP"); 1429 continue; 1430 } 1431 cp = optptr; 1432 optlen = optptr[1]; 1433 if (optlen < 2 || optlen > totlen) 1434 break; 1435 1436 switch (*cp) { 1437 case IPOPT_SSRR: 1438 case IPOPT_LSRR: 1439 printf("\n%cSRR: ", *cp==IPOPT_SSRR ? 'S' : 'L'); 1440 j = *++cp; 1441 i = *++cp; 1442 i -= 4; 1443 cp++; 1444 if (j > IPOPT_MINOFF) { 1445 for (;;) { 1446 __u32 address; 1447 memcpy(&address, cp, 4); 1448 cp += 4; 1449 if (address == 0) 1450 printf("\t0.0.0.0"); 1451 else 1452 printf("\t%s", pr_addr(address)); 1453 j -= 4; 1454 putchar('\n'); 1455 if (j <= IPOPT_MINOFF) 1456 break; 1457 } 1458 } 1459 break; 1460 case IPOPT_RR: 1461 j = *++cp; /* get length */ 1462 i = *++cp; /* and pointer */ 1463 if (i > j) 1464 i = j; 1465 i -= IPOPT_MINOFF; 1466 if (i <= 0) 1467 continue; 1468 if (i == old_rrlen 1469 && !memcmp((char *)cp, old_rr, i) 1470 && !(options & F_FLOOD)) { 1471 printf("\t(same route)"); 1472 i = ((i + 3) / 4) * 4; 1473 cp += i; 1474 break; 1475 } 1476 old_rrlen = i; 1477 memcpy((char *)cp, old_rr, i); 1478 printf("\nRR: "); 1479 cp++; 1480 for (;;) { 1481 __u32 address; 1482 memcpy(&address, cp, 4); 1483 cp += 4; 1484 if (address == 0) 1485 printf("\t0.0.0.0"); 1486 else 1487 printf("\t%s", pr_addr(address)); 1488 i -= 4; 1489 putchar('\n'); 1490 if (i <= 0) 1491 break; 1492 } 1493 break; 1494 case IPOPT_TS: 1495 { 1496 int stdtime = 0, nonstdtime = 0; 1497 __u8 flags; 1498 j = *++cp; /* get length */ 1499 i = *++cp; /* and pointer */ 1500 if (i > j) 1501 i = j; 1502 i -= 5; 1503 if (i <= 0) 1504 continue; 1505 flags = *++cp; 1506 printf("\nTS: "); 1507 cp++; 1508 for (;;) { 1509 long l; 1510 1511 if ((flags&0xF) != IPOPT_TS_TSONLY) { 1512 __u32 address; 1513 memcpy(&address, cp, 4); 1514 cp += 4; 1515 if (address == 0) 1516 printf("\t0.0.0.0"); 1517 else 1518 printf("\t%s", pr_addr(address)); 1519 i -= 4; 1520 if (i <= 0) 1521 break; 1522 } 1523 l = *cp++; 1524 l = (l<<8) + *cp++; 1525 l = (l<<8) + *cp++; 1526 l = (l<<8) + *cp++; 1527 1528 if (l & 0x80000000) { 1529 if (nonstdtime==0) 1530 printf("\t%ld absolute not-standard", l&0x7fffffff); 1531 else 1532 printf("\t%ld not-standard", (l&0x7fffffff) - nonstdtime); 1533 nonstdtime = l&0x7fffffff; 1534 } else { 1535 if (stdtime==0) 1536 printf("\t%ld absolute", l); 1537 else 1538 printf("\t%ld", l - stdtime); 1539 stdtime = l; 1540 } 1541 i -= 4; 1542 putchar('\n'); 1543 if (i <= 0) 1544 break; 1545 } 1546 if (flags>>4) 1547 printf("Unrecorded hops: %d\n", flags>>4); 1548 break; 1549 } 1550 default: 1551 printf("\nunknown option %x", *cp); 1552 break; 1553 } 1554 totlen -= optlen; 1555 optptr += optlen; 1556 } 1557 } 1558 1559 1560 /* 1561 * pr_iph -- 1562 * Print an IP header with options. 1563 */ 1564 void pr_iph(struct iphdr *ip) 1565 { 1566 int hlen; 1567 u_char *cp; 1568 1569 hlen = ip->ihl << 2; 1570 cp = (u_char *)ip + 20; /* point to options */ 1571 1572 printf("Vr HL TOS Len ID Flg off TTL Pro cks Src Dst Data\n"); 1573 printf(" %1x %1x %02x %04x %04x", 1574 ip->version, ip->ihl, ip->tos, ip->tot_len, ip->id); 1575 printf(" %1x %04x", ((ip->frag_off) & 0xe000) >> 13, 1576 (ip->frag_off) & 0x1fff); 1577 printf(" %02x %02x %04x", ip->ttl, ip->protocol, ip->check); 1578 printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->saddr)); 1579 printf(" %s ", inet_ntoa(*(struct in_addr *)&ip->daddr)); 1580 printf("\n"); 1581 pr_options(cp, hlen); 1582 } 1583 1584 /* 1585 * pr_addr -- 1586 * Return an ascii host address as a dotted quad and optionally with 1587 * a hostname. 1588 */ 1589 char * 1590 pr_addr(__u32 addr) 1591 { 1592 struct hostent *hp; 1593 static char buf[4096]; 1594 1595 if ((options & F_NUMERIC) || 1596 !(hp = gethostbyaddr((char *)&addr, 4, AF_INET))) 1597 sprintf(buf, "%s", inet_ntoa(*(struct in_addr *)&addr)); 1598 else 1599 snprintf(buf, sizeof(buf), "%s (%s)", hp->h_name, 1600 inet_ntoa(*(struct in_addr *)&addr)); 1601 return(buf); 1602 } 1603 1604 1605 /* Set Type of Service (TOS) and other Quality of Service relating bits */ 1606 int parsetos(char *str) 1607 { 1608 const char *cp; 1609 int tos; 1610 char *ep; 1611 1612 /* handle both hex and decimal values */ 1613 if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) { 1614 cp = str + 2; 1615 tos = (int)strtol(cp, &ep, 16); 1616 } else 1617 tos = (int)strtol(str, &ep, 10); 1618 1619 /* doesn't look like decimal or hex, eh? */ 1620 if (*ep != '\0') { 1621 fprintf(stderr, "ping: \"%s\" bad value for TOS\n", str); 1622 exit(2); 1623 } 1624 1625 if (tos > TOS_MAX) { 1626 fprintf(stderr, "ping: the decimal value of TOS bits must be 0-254 (or zero)\n"); 1627 exit(2); 1628 } 1629 return(tos); 1630 } 1631 1632 #include <linux/filter.h> 1633 1634 void install_filter(void) 1635 { 1636 static int once; 1637 static struct sock_filter insns[] = { 1638 BPF_STMT(BPF_LDX|BPF_B|BPF_MSH, 0), /* Skip IP header. F..g BSD... Look into ping6. */ 1639 BPF_STMT(BPF_LD|BPF_H|BPF_IND, 4), /* Load icmp echo ident */ 1640 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0xAAAA, 0, 1), /* Ours? */ 1641 BPF_STMT(BPF_RET|BPF_K, ~0U), /* Yes, it passes. */ 1642 BPF_STMT(BPF_LD|BPF_B|BPF_IND, 0), /* Load icmp type */ 1643 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, ICMP_ECHOREPLY, 1, 0), /* Echo? */ 1644 BPF_STMT(BPF_RET|BPF_K, 0xFFFFFFF), /* No. It passes. */ 1645 BPF_STMT(BPF_RET|BPF_K, 0) /* Echo with wrong ident. Reject. */ 1646 }; 1647 static struct sock_fprog filter = { 1648 sizeof insns / sizeof(insns[0]), 1649 insns 1650 }; 1651 1652 if (once) 1653 return; 1654 once = 1; 1655 1656 /* Patch bpflet for current identifier. */ 1657 insns[2] = (struct sock_filter)BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __constant_htons(ident), 0, 1); 1658 1659 if (setsockopt(icmp_sock, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter))) 1660 perror("WARNING: failed to install socket filter\n"); 1661 } 1662 1663 1664 void usage(void) 1665 { 1666 fprintf(stderr, 1667 "Usage: ping [-LRUbdfnqrvVaA] [-c count] [-i interval] [-w deadline]\n" 1668 " [-p pattern] [-s packetsize] [-t ttl] [-I interface or address]\n" 1669 " [-M mtu discovery hint] [-S sndbuf]\n" 1670 " [ -T timestamp option ] [ -Q tos ] [hop1 ...] destination\n"); 1671 exit(2); 1672 } 1673 1674 int isInSupplementaryGroup(gid_t group) { 1675 long ngroups_max; 1676 gid_t empty[0]; 1677 gid_t *groups; 1678 int ngroups; 1679 int i; 1680 1681 if (getuid() == 0) { 1682 // root is presumed to be in every group 1683 return 1; 1684 } 1685 1686 ngroups = getgroups(0, empty); 1687 if (ngroups < 0) { 1688 perror("ping: call to getgroups for sizing failed"); 1689 exit(2); 1690 } 1691 groups = (gid_t *) malloc((ngroups * sizeof(gid_t))); 1692 if (groups == NULL) { 1693 fprintf(stderr, "ping: unable to allocate memory for %d groups. Aborting\n", ngroups); 1694 exit(2); 1695 } 1696 ngroups = getgroups(ngroups, groups); 1697 if (ngroups < 0) { 1698 perror("ping: getgroups failed"); 1699 exit(2); 1700 } 1701 1702 for (i = 0; i < ngroups; i++) { 1703 if (group == groups[i]) { 1704 free(groups); 1705 return 1; 1706 } 1707 } 1708 1709 free(groups); 1710 return 0; 1711 } 1712 1713 int main(int argc, char *argv[]) 1714 { 1715 struct hostent *hp; 1716 int ch, hold, packlen; 1717 int socket_errno; 1718 u_char *packet; 1719 char *target, hnamebuf[MAXHOSTNAMELEN]; 1720 char rspace[3 + 4 * NROUTES + 1]; /* record route space */ 1721 1722 icmp_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 1723 socket_errno = errno; 1724 1725 /* if we were setuid root, undo that */ 1726 if (setuid(getuid())) return -1; 1727 1728 if (!isInSupplementaryGroup(AID_INET)) { 1729 fprintf(stderr, "You must have internet permissions to use ping. Aborting.\n"); 1730 exit(2); 1731 } 1732 1733 source.sin_family = AF_INET; 1734 1735 preload = 1; 1736 while ((ch = getopt(argc, argv, COMMON_OPTSTR "bRT:")) != EOF) { 1737 switch(ch) { 1738 case 'b': 1739 broadcast_pings = 1; 1740 break; 1741 case 'Q': 1742 settos = parsetos(optarg); 1743 if (settos && 1744 (setsockopt(icmp_sock, IPPROTO_IP, IP_TOS, 1745 (char *)&settos, sizeof(int)) < 0)) { 1746 perror("ping: error setting QOS sockopts"); 1747 exit(2); 1748 } 1749 break; 1750 case 'R': 1751 if (options & F_TIMESTAMP) { 1752 fprintf(stderr, "Only one of -T or -R may be used\n"); 1753 exit(2); 1754 } 1755 options |= F_RROUTE; 1756 break; 1757 case 'T': 1758 if (options & F_RROUTE) { 1759 fprintf(stderr, "Only one of -T or -R may be used\n"); 1760 exit(2); 1761 } 1762 options |= F_TIMESTAMP; 1763 if (strcmp(optarg, "tsonly") == 0) 1764 ts_type = IPOPT_TS_TSONLY; 1765 else if (strcmp(optarg, "tsandaddr") == 0) 1766 ts_type = IPOPT_TS_TSANDADDR; 1767 else if (strcmp(optarg, "tsprespec") == 0) 1768 ts_type = IPOPT_TS_PRESPEC; 1769 else { 1770 fprintf(stderr, "Invalid timestamp type\n"); 1771 exit(2); 1772 } 1773 break; 1774 case 'I': 1775 { 1776 char dummy; 1777 int i1, i2, i3, i4; 1778 1779 if (sscanf(optarg, "%u.%u.%u.%u%c", 1780 &i1, &i2, &i3, &i4, &dummy) == 4) { 1781 __u8 *ptr; 1782 ptr = (__u8*)&source.sin_addr; 1783 ptr[0] = i1; 1784 ptr[1] = i2; 1785 ptr[2] = i3; 1786 ptr[3] = i4; 1787 options |= F_STRICTSOURCE; 1788 } else { 1789 device = optarg; 1790 } 1791 break; 1792 } 1793 case 'M': 1794 if (strcmp(optarg, "do") == 0) 1795 pmtudisc = IP_PMTUDISC_DO; 1796 else if (strcmp(optarg, "dont") == 0) 1797 pmtudisc = IP_PMTUDISC_DONT; 1798 else if (strcmp(optarg, "want") == 0) 1799 pmtudisc = IP_PMTUDISC_WANT; 1800 else { 1801 fprintf(stderr, "ping: wrong value for -M: do, dont, want are valid ones.\n"); 1802 exit(2); 1803 } 1804 break; 1805 case 'V': 1806 printf("ping utility, iputils-ss\n"); 1807 exit(0); 1808 COMMON_OPTIONS 1809 common_options(ch); 1810 break; 1811 default: 1812 usage(); 1813 } 1814 } 1815 argc -= optind; 1816 argv += optind; 1817 1818 if (argc == 0) 1819 usage(); 1820 if (argc > 1) { 1821 if (options & F_RROUTE) 1822 usage(); 1823 else if (options & F_TIMESTAMP) { 1824 if (ts_type != IPOPT_TS_PRESPEC) 1825 usage(); 1826 if (argc > 5) 1827 usage(); 1828 } else { 1829 if (argc > 10) 1830 usage(); 1831 options |= F_SOURCEROUTE; 1832 } 1833 } 1834 while (argc > 0) { 1835 target = *argv; 1836 1837 bzero((char *)&whereto, sizeof(whereto)); 1838 whereto.sin_family = AF_INET; 1839 if (inet_aton(target, &whereto.sin_addr) == 1) { 1840 hostname = target; 1841 if (argc == 1) 1842 options |= F_NUMERIC; 1843 } else { 1844 hp = gethostbyname(target); 1845 hp = gethostbyname(target); 1846 hp = gethostbyname(target); 1847 if (!hp) { 1848 fprintf(stderr, "ping: unknown host %s\n", target); 1849 exit(2); 1850 } 1851 memcpy(&whereto.sin_addr, hp->h_addr, 4); 1852 strncpy(hnamebuf, hp->h_name, sizeof(hnamebuf) - 1); 1853 hnamebuf[sizeof(hnamebuf) - 1] = 0; 1854 hostname = hnamebuf; 1855 } 1856 if (argc > 1) 1857 route[nroute++] = whereto.sin_addr.s_addr; 1858 argc--; 1859 argv++; 1860 } 1861 1862 if (source.sin_addr.s_addr == 0) { 1863 int alen; 1864 struct sockaddr_in dst = whereto; 1865 int probe_fd = socket(AF_INET, SOCK_DGRAM, 0); 1866 1867 if (probe_fd < 0) { 1868 perror("socket"); 1869 exit(2); 1870 } 1871 if (device) { 1872 struct ifreq ifr; 1873 memset(&ifr, 0, sizeof(ifr)); 1874 strncpy(ifr.ifr_name, device, IFNAMSIZ-1); 1875 if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1) == -1) { 1876 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 1877 struct ip_mreqn imr; 1878 if (ioctl(probe_fd, SIOCGIFINDEX, &ifr) < 0) { 1879 fprintf(stderr, "ping: unknown iface %s\n", device); 1880 exit(2); 1881 } 1882 memset(&imr, 0, sizeof(imr)); 1883 imr.imr_ifindex = ifr.ifr_ifindex; 1884 if (setsockopt(probe_fd, SOL_IP, IP_MULTICAST_IF, &imr, sizeof(imr)) == -1) { 1885 perror("ping: IP_MULTICAST_IF"); 1886 exit(2); 1887 } 1888 } 1889 } 1890 } 1891 1892 if (settos && 1893 setsockopt(probe_fd, IPPROTO_IP, IP_TOS, (char *)&settos, sizeof(int)) < 0) 1894 perror("Warning: error setting QOS sockopts"); 1895 1896 dst.sin_port = htons(1025); 1897 if (nroute) 1898 dst.sin_addr.s_addr = route[0]; 1899 if (connect(probe_fd, (struct sockaddr*)&dst, sizeof(dst)) == -1) { 1900 if (errno == EACCES) { 1901 if (broadcast_pings == 0) { 1902 fprintf(stderr, "Do you want to ping broadcast? Then -b\n"); 1903 exit(2); 1904 } 1905 fprintf(stderr, "WARNING: pinging broadcast address\n"); 1906 if (setsockopt(probe_fd, SOL_SOCKET, SO_BROADCAST, 1907 &broadcast_pings, sizeof(broadcast_pings)) < 0) { 1908 perror ("can't set broadcasting"); 1909 exit(2); 1910 } 1911 if (connect(probe_fd, (struct sockaddr*)&dst, sizeof(dst)) == -1) { 1912 perror("connect"); 1913 exit(2); 1914 } 1915 } else { 1916 perror("connect"); 1917 exit(2); 1918 } 1919 } 1920 alen = sizeof(source); 1921 if (getsockname(probe_fd, (struct sockaddr*)&source, &alen) == -1) { 1922 perror("getsockname"); 1923 exit(2); 1924 } 1925 source.sin_port = 0; 1926 close(probe_fd); 1927 } while (0); 1928 1929 if (whereto.sin_addr.s_addr == 0) 1930 whereto.sin_addr.s_addr = source.sin_addr.s_addr; 1931 1932 if (icmp_sock < 0) { 1933 errno = socket_errno; 1934 perror("ping: icmp open socket"); 1935 exit(2); 1936 } 1937 1938 if (device) { 1939 struct ifreq ifr; 1940 1941 memset(&ifr, 0, sizeof(ifr)); 1942 strncpy(ifr.ifr_name, device, IFNAMSIZ-1); 1943 if (ioctl(icmp_sock, SIOCGIFINDEX, &ifr) < 0) { 1944 fprintf(stderr, "ping: unknown iface %s\n", device); 1945 exit(2); 1946 } 1947 cmsg.ipi.ipi_ifindex = ifr.ifr_ifindex; 1948 cmsg_len = sizeof(cmsg); 1949 } 1950 1951 if (broadcast_pings || IN_MULTICAST(ntohl(whereto.sin_addr.s_addr))) { 1952 if (uid) { 1953 if (interval < 1000) { 1954 fprintf(stderr, "ping: broadcast ping with too short interval.\n"); 1955 exit(2); 1956 } 1957 if (pmtudisc >= 0 && pmtudisc != IP_PMTUDISC_DO) { 1958 fprintf(stderr, "ping: broadcast ping does not fragment.\n"); 1959 exit(2); 1960 } 1961 } 1962 if (pmtudisc < 0) 1963 pmtudisc = IP_PMTUDISC_DO; 1964 } 1965 1966 if (pmtudisc >= 0) { 1967 if (setsockopt(icmp_sock, SOL_IP, IP_MTU_DISCOVER, &pmtudisc, sizeof(pmtudisc)) == -1) { 1968 perror("ping: IP_MTU_DISCOVER"); 1969 exit(2); 1970 } 1971 } 1972 1973 if ((options&F_STRICTSOURCE) && 1974 bind(icmp_sock, (struct sockaddr*)&source, sizeof(source)) == -1) { 1975 perror("bind"); 1976 exit(2); 1977 } 1978 1979 if (1) { 1980 struct icmp_filter filt; 1981 filt.data = ~((1<<ICMP_SOURCE_QUENCH)| 1982 (1<<ICMP_DEST_UNREACH)| 1983 (1<<ICMP_TIME_EXCEEDED)| 1984 (1<<ICMP_PARAMETERPROB)| 1985 (1<<ICMP_REDIRECT)| 1986 (1<<ICMP_ECHOREPLY)); 1987 if (setsockopt(icmp_sock, SOL_RAW, ICMP_FILTER, (char*)&filt, sizeof(filt)) == -1) 1988 perror("WARNING: setsockopt(ICMP_FILTER)"); 1989 } 1990 1991 hold = 1; 1992 if (setsockopt(icmp_sock, SOL_IP, IP_RECVERR, (char *)&hold, sizeof(hold))) 1993 fprintf(stderr, "WARNING: your kernel is veeery old. No problems.\n"); 1994 1995 /* record route option */ 1996 if (options & F_RROUTE) { 1997 bzero(rspace, sizeof(rspace)); 1998 rspace[0] = IPOPT_NOP; 1999 rspace[1+IPOPT_OPTVAL] = IPOPT_RR; 2000 rspace[1+IPOPT_OLEN] = sizeof(rspace)-1; 2001 rspace[1+IPOPT_OFFSET] = IPOPT_MINOFF; 2002 optlen = 40; 2003 if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, sizeof(rspace)) < 0) { 2004 perror("ping: record route"); 2005 exit(2); 2006 } 2007 } 2008 if (options & F_TIMESTAMP) { 2009 bzero(rspace, sizeof(rspace)); 2010 rspace[0] = IPOPT_TIMESTAMP; 2011 rspace[1] = (ts_type==IPOPT_TS_TSONLY ? 40 : 36); 2012 rspace[2] = 5; 2013 rspace[3] = ts_type; 2014 if (ts_type == IPOPT_TS_PRESPEC) { 2015 int i; 2016 rspace[1] = 4+nroute*8; 2017 for (i=0; i<nroute; i++) 2018 *(__u32*)&rspace[4+i*8] = route[i]; 2019 } 2020 if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, rspace[1]) < 0) { 2021 rspace[3] = 2; 2022 if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, rspace[1]) < 0) { 2023 perror("ping: ts option"); 2024 exit(2); 2025 } 2026 } 2027 optlen = 40; 2028 } 2029 if (options & F_SOURCEROUTE) { 2030 int i; 2031 bzero(rspace, sizeof(rspace)); 2032 rspace[0] = IPOPT_NOOP; 2033 rspace[1+IPOPT_OPTVAL] = (options & F_SO_DONTROUTE) ? IPOPT_SSRR 2034 : IPOPT_LSRR; 2035 rspace[1+IPOPT_OLEN] = 3 + nroute*4; 2036 rspace[1+IPOPT_OFFSET] = IPOPT_MINOFF; 2037 for (i=0; i<nroute; i++) 2038 *(__u32*)&rspace[4+i*4] = route[i]; 2039 2040 if (setsockopt(icmp_sock, IPPROTO_IP, IP_OPTIONS, rspace, 4 + nroute*4) < 0) { 2041 perror("ping: record route"); 2042 exit(2); 2043 } 2044 optlen = 40; 2045 } 2046 2047 /* Estimate memory eaten by single packet. It is rough estimate. 2048 * Actually, for small datalen's it depends on kernel side a lot. */ 2049 hold = datalen + 8; 2050 hold += ((hold+511)/512)*(optlen + 20 + 16 + 64 + 160); 2051 sock_setbufs(icmp_sock, hold); 2052 2053 if (broadcast_pings) { 2054 if (setsockopt(icmp_sock, SOL_SOCKET, SO_BROADCAST, 2055 &broadcast_pings, sizeof(broadcast_pings)) < 0) { 2056 perror ("ping: can't set broadcasting"); 2057 exit(2); 2058 } 2059 } 2060 2061 if (options & F_NOLOOP) { 2062 int loop = 0; 2063 if (setsockopt(icmp_sock, IPPROTO_IP, IP_MULTICAST_LOOP, 2064 &loop, 1) == -1) { 2065 perror ("ping: can't disable multicast loopback"); 2066 exit(2); 2067 } 2068 } 2069 if (options & F_TTL) { 2070 int ittl = ttl; 2071 if (setsockopt(icmp_sock, IPPROTO_IP, IP_MULTICAST_TTL, 2072 &ttl, 1) == -1) { 2073 perror ("ping: can't set multicast time-to-live"); 2074 exit(2); 2075 } 2076 if (setsockopt(icmp_sock, IPPROTO_IP, IP_TTL, 2077 &ittl, sizeof(ittl)) == -1) { 2078 perror ("ping: can't set unicast time-to-live"); 2079 exit(2); 2080 } 2081 } 2082 2083 if (datalen > 0xFFFF - 8 - optlen - 20) { 2084 if (uid || datalen > sizeof(outpack)-8) { 2085 fprintf(stderr, "Error: packet size %d is too large. Maximum is %d\n", datalen, 0xFFFF-8-20-optlen); 2086 exit(2); 2087 } 2088 /* Allow small oversize to root yet. It will cause EMSGSIZE. */ 2089 fprintf(stderr, "WARNING: packet size %d is too large. Maximum is %d\n", datalen, 0xFFFF-8-20-optlen); 2090 } 2091 2092 if (datalen >= sizeof(struct timeval)) /* can we time transfer */ 2093 timing = 1; 2094 packlen = datalen + MAXIPLEN + MAXICMPLEN; 2095 if (!(packet = (u_char *)malloc((u_int)packlen))) { 2096 fprintf(stderr, "ping: out of memory.\n"); 2097 exit(2); 2098 } 2099 2100 printf("PING %s (%s) ", hostname, inet_ntoa(whereto.sin_addr)); 2101 if (device || (options&F_STRICTSOURCE)) 2102 printf("from %s %s: ", inet_ntoa(source.sin_addr), device ?: ""); 2103 printf("%d(%d) bytes of data.\n", datalen, datalen+8+optlen+20); 2104 2105 setup(icmp_sock); 2106 2107 main_loop(icmp_sock, packet, packlen); 2108 return 0; 2109 } 2110 2111 void *dlopen(const char *filename, int flag) { return 0; } 2112 char *dlerror(void) { return 0; } 2113 void *dlsym(void *handle, const char *symbol) { return 0; } 2114 int dlclose(void *handle) { return 0; } 2115
