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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 | /* vi: set sw=4 ts=4: */ /* * $Id: ping.c,v 1.39 2001/03/14 01:23:07 andersen Exp $ * Mini ping implementation for busybox * * Copyright (C) 1999 by Randolph Chung <tausq@debian.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * This version of ping is adapted from the ping in netkit-base 0.10, * which is: * * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Mike Muuss. * * Original copyright notice is retained at the end of this file. */ #include <sys/param.h> #include <sys/socket.h> #include <sys/file.h> #include <sys/time.h> #include <sys/times.h> #include <sys/signal.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip_icmp.h> #include <arpa/inet.h> #include <netdb.h> #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <unistd.h> #include <string.h> #include <stdlib.h> #include "busybox.h" /* It turns out that libc5 doesn't have proper icmp support * built into it header files, so we have to supplement it */ #if ! defined __GLIBC__ && ! defined __UCLIBC__ static const int ICMP_MINLEN = 8; /* abs minimum */ struct icmp_ra_addr { u_int32_t ira_addr; u_int32_t ira_preference; }; struct icmp { u_int8_t icmp_type; /* type of message, see below */ u_int8_t icmp_code; /* type sub code */ u_int16_t icmp_cksum; /* ones complement checksum of struct */ union { u_char ih_pptr; /* ICMP_PARAMPROB */ struct in_addr ih_gwaddr; /* gateway address */ struct ih_idseq /* echo datagram */ { u_int16_t icd_id; u_int16_t icd_seq; } ih_idseq; u_int32_t ih_void; /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */ struct ih_pmtu { u_int16_t ipm_void; u_int16_t ipm_nextmtu; } ih_pmtu; struct ih_rtradv { u_int8_t irt_num_addrs; u_int8_t irt_wpa; u_int16_t irt_lifetime; } ih_rtradv; } icmp_hun; #define icmp_pptr icmp_hun.ih_pptr #define icmp_gwaddr icmp_hun.ih_gwaddr #define icmp_id icmp_hun.ih_idseq.icd_id #define icmp_seq icmp_hun.ih_idseq.icd_seq #define icmp_void icmp_hun.ih_void #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu #define icmp_num_addrs icmp_hun.ih_rtradv.irt_num_addrs #define icmp_wpa icmp_hun.ih_rtradv.irt_wpa #define icmp_lifetime icmp_hun.ih_rtradv.irt_lifetime union { struct { u_int32_t its_otime; u_int32_t its_rtime; u_int32_t its_ttime; } id_ts; struct { struct ip idi_ip; /* options and then 64 bits of data */ } id_ip; struct icmp_ra_addr id_radv; u_int32_t id_mask; u_int8_t id_data[1]; } icmp_dun; #define icmp_otime icmp_dun.id_ts.its_otime #define icmp_rtime icmp_dun.id_ts.its_rtime #define icmp_ttime icmp_dun.id_ts.its_ttime #define icmp_ip icmp_dun.id_ip.idi_ip #define icmp_radv icmp_dun.id_radv #define icmp_mask icmp_dun.id_mask #define icmp_data icmp_dun.id_data }; #endif static const int DEFDATALEN = 56; static const int MAXIPLEN = 60; static const int MAXICMPLEN = 76; static const int MAXPACKET = 65468; #define MAX_DUP_CHK (8 * 128) static const int MAXWAIT = 10; static const int PINGINTERVAL = 1; /* second */ #define O_QUIET (1 << 0) #define A(bit) rcvd_tbl[(bit)>>3] /* identify byte in array */ #define B(bit) (1 << ((bit) & 0x07)) /* identify bit in byte */ #define SET(bit) (A(bit) |= B(bit)) #define CLR(bit) (A(bit) &= (~B(bit))) #define TST(bit) (A(bit) & B(bit)) static void ping(const char *host); /* common routines */ static int in_cksum(unsigned short *buf, int sz) { int nleft = sz; int sum = 0; unsigned short *w = buf; unsigned short ans = 0; while (nleft > 1) { sum += *w++; nleft -= 2; } if (nleft == 1) { *(unsigned char *) (&ans) = *(unsigned char *) w; sum += ans; } sum = (sum >> 16) + (sum & 0xFFFF); sum += (sum >> 16); ans = ~sum; return (ans); } /* simple version */ #ifdef BB_FEATURE_SIMPLE_PING static char *hostname = NULL; static void noresp(int ign) { printf("No response from %s\n", hostname); exit(0); } static void ping(const char *host) { struct hostent *h; struct sockaddr_in pingaddr; struct icmp *pkt; int pingsock, c; char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN]; if ((pingsock = socket(AF_INET, SOCK_RAW, 1)) < 0) /* 1 == ICMP */ perror_msg_and_die("creating a raw socket"); /* drop root privs if running setuid */ setuid(getuid()); memset(&pingaddr, 0, sizeof(struct sockaddr_in)); pingaddr.sin_family = AF_INET; if (!(h = gethostbyname(host))) { error_msg("unknown host %s", host); exit(1); } memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr)); hostname = h->h_name; pkt = (struct icmp *) packet; memset(pkt, 0, sizeof(packet)); pkt->icmp_type = ICMP_ECHO; pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet)); c = sendto(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in)); if (c < 0 || c != sizeof(packet)) perror_msg_and_die("sendto"); signal(SIGALRM, noresp); alarm(5); /* give the host 5000ms to respond */ /* listen for replies */ while (1) { struct sockaddr_in from; size_t fromlen = sizeof(from); if ((c = recvfrom(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &from, &fromlen)) < 0) { if (errno == EINTR) continue; perror_msg("recvfrom"); continue; } if (c >= 76) { /* ip + icmp */ struct iphdr *iphdr = (struct iphdr *) packet; pkt = (struct icmp *) (packet + (iphdr->ihl << 2)); /* skip ip hdr */ if (pkt->icmp_type == ICMP_ECHOREPLY) break; } } printf("%s is alive!\n", hostname); return; } extern int ping_main(int argc, char **argv) { argc--; argv++; if (argc < 1) show_usage(); ping(*argv); return EXIT_SUCCESS; } #else /* ! BB_FEATURE_SIMPLE_PING */ /* full(er) version */ static char *hostname = NULL; static struct sockaddr_in pingaddr; static int pingsock = -1; static int datalen; /* intentionally uninitialized to work around gcc bug */ static long ntransmitted = 0, nreceived = 0, nrepeats = 0, pingcount = 0; static int myid = 0, options = 0; static unsigned long tmin = ULONG_MAX, tmax = 0, tsum = 0; static char rcvd_tbl[MAX_DUP_CHK / 8]; static void sendping(int); static void pingstats(int); static void unpack(char *, int, struct sockaddr_in *); /**************************************************************************/ static void pingstats(int junk) { int status; signal(SIGINT, SIG_IGN); printf("\n--- %s ping statistics ---\n", hostname); printf("%ld packets transmitted, ", ntransmitted); printf("%ld packets received, ", nreceived); if (nrepeats) printf("%ld duplicates, ", nrepeats); if (ntransmitted) printf("%ld%% packet loss\n", (ntransmitted - nreceived) * 100 / ntransmitted); if (nreceived) printf("round-trip min/avg/max = %lu.%lu/%lu.%lu/%lu.%lu ms\n", tmin / 10, tmin % 10, (tsum / (nreceived + nrepeats)) / 10, (tsum / (nreceived + nrepeats)) % 10, tmax / 10, tmax % 10); if (nreceived != 0) status = EXIT_SUCCESS; else status = EXIT_FAILURE; exit(status); } static void sendping(int junk) { struct icmp *pkt; int i; char packet[datalen + 8]; pkt = (struct icmp *) packet; pkt->icmp_type = ICMP_ECHO; pkt->icmp_code = 0; pkt->icmp_cksum = 0; pkt->icmp_seq = ntransmitted++; pkt->icmp_id = myid; CLR(pkt->icmp_seq % MAX_DUP_CHK); gettimeofday((struct timeval *) &packet[8], NULL); pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet)); i = sendto(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in)); if (i < 0) perror_msg_and_die("sendto"); else if ((size_t)i != sizeof(packet)) error_msg_and_die("ping wrote %d chars; %d expected", i, (int)sizeof(packet)); signal(SIGALRM, sendping); if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */ alarm(PINGINTERVAL); } else { /* done, wait for the last ping to come back */ /* todo, don't necessarily need to wait so long... */ signal(SIGALRM, pingstats); alarm(MAXWAIT); } } static char *icmp_type_name (int id) { switch (id) { case ICMP_ECHOREPLY: return "Echo Reply"; case ICMP_DEST_UNREACH: return "Destination Unreachable"; case ICMP_SOURCE_QUENCH: return "Source Quench"; case ICMP_REDIRECT: return "Redirect (change route)"; case ICMP_ECHO: return "Echo Request"; case ICMP_TIME_EXCEEDED: return "Time Exceeded"; case ICMP_PARAMETERPROB: return "Parameter Problem"; case ICMP_TIMESTAMP: return "Timestamp Request"; case ICMP_TIMESTAMPREPLY: return "Timestamp Reply"; case ICMP_INFO_REQUEST: return "Information Request"; case ICMP_INFO_REPLY: return "Information Reply"; case ICMP_ADDRESS: return "Address Mask Request"; case ICMP_ADDRESSREPLY: return "Address Mask Reply"; default: return "unknown ICMP type"; } } static void unpack(char *buf, int sz, struct sockaddr_in *from) { struct icmp *icmppkt; struct iphdr *iphdr; struct timeval tv, *tp; int hlen, dupflag; unsigned long triptime; gettimeofday(&tv, NULL); /* check IP header */ iphdr = (struct iphdr *) buf; hlen = iphdr->ihl << 2; /* discard if too short */ if (sz < (datalen + ICMP_MINLEN)) return; sz -= hlen; icmppkt = (struct icmp *) (buf + hlen); if (icmppkt->icmp_id != myid) return; /* not our ping */ if (icmppkt->icmp_type == ICMP_ECHOREPLY) { ++nreceived; tp = (struct timeval *) icmppkt->icmp_data; if ((tv.tv_usec -= tp->tv_usec) < 0) { --tv.tv_sec; tv.tv_usec += 1000000; } tv.tv_sec -= tp->tv_sec; triptime = tv.tv_sec * 10000 + (tv.tv_usec / 100); tsum += triptime; if (triptime < tmin) tmin = triptime; if (triptime > tmax) tmax = triptime; if (TST(icmppkt->icmp_seq % MAX_DUP_CHK)) { ++nrepeats; --nreceived; dupflag = 1; } else { SET(icmppkt->icmp_seq % MAX_DUP_CHK); dupflag = 0; } if (options & O_QUIET) return; printf("%d bytes from %s: icmp_seq=%u", sz, inet_ntoa(*(struct in_addr *) &from->sin_addr.s_addr), icmppkt->icmp_seq); printf(" ttl=%d", iphdr->ttl); printf(" time=%lu.%lu ms", triptime / 10, triptime % 10); if (dupflag) printf(" (DUP!)"); printf("\n"); } else if (icmppkt->icmp_type != ICMP_ECHO) error_msg("Warning: Got ICMP %d (%s)", icmppkt->icmp_type, icmp_type_name (icmppkt->icmp_type)); } static void ping(const char *host) { struct protoent *proto; struct hostent *h; char buf[MAXHOSTNAMELEN]; char packet[datalen + MAXIPLEN + MAXICMPLEN]; int sockopt; proto = getprotobyname("icmp"); /* if getprotobyname failed, just silently force * proto->p_proto to have the correct value for "icmp" */ if ((pingsock = socket(AF_INET, SOCK_RAW, (proto ? proto->p_proto : 1))) < 0) { /* 1 == ICMP */ if (errno == EPERM) error_msg_and_die("permission denied. (are you root?)"); else perror_msg_and_die("creating a raw socket"); } /* drop root privs if running setuid */ setuid(getuid()); memset(&pingaddr, 0, sizeof(struct sockaddr_in)); pingaddr.sin_family = AF_INET; if (!(h = gethostbyname(host))) { error_msg("unknown host %s", host); exit(1); } if (h->h_addrtype != AF_INET) { error_msg("unknown address type; only AF_INET is currently supported."); exit(1); } pingaddr.sin_family = AF_INET; /* h->h_addrtype */ memcpy(&pingaddr.sin_addr, h->h_addr, sizeof(pingaddr.sin_addr)); strncpy(buf, h->h_name, sizeof(buf) - 1); hostname = buf; /* enable broadcast pings */ sockopt = 1; setsockopt(pingsock, SOL_SOCKET, SO_BROADCAST, (char *) &sockopt, sizeof(sockopt)); /* set recv buf for broadcast pings */ sockopt = 48 * 1024; setsockopt(pingsock, SOL_SOCKET, SO_RCVBUF, (char *) &sockopt, sizeof(sockopt)); printf("PING %s (%s): %d data bytes\n", hostname, inet_ntoa(*(struct in_addr *) &pingaddr.sin_addr.s_addr), datalen); signal(SIGINT, pingstats); /* start the ping's going ... */ sendping(0); /* listen for replies */ while (1) { struct sockaddr_in from; socklen_t fromlen = (socklen_t) sizeof(from); int c; if ((c = recvfrom(pingsock, packet, sizeof(packet), 0, (struct sockaddr *) &from, &fromlen)) < 0) { if (errno == EINTR) continue; perror_msg("recvfrom"); continue; } unpack(packet, c, &from); if (pingcount > 0 && nreceived >= pingcount) break; } pingstats(0); } extern int ping_main(int argc, char **argv) { char *thisarg; datalen = DEFDATALEN; /* initialized here rather than in global scope to work around gcc bug */ argc--; argv++; options = 0; /* Parse any options */ while (argc >= 1 && **argv == '-') { thisarg = *argv; thisarg++; switch (*thisarg) { case 'q': options |= O_QUIET; break; case 'c': if (--argc <= 0) show_usage(); argv++; pingcount = atoi(*argv); break; case 's': if (--argc <= 0) show_usage(); argv++; datalen = atoi(*argv); break; default: show_usage(); } argc--; argv++; } if (argc < 1) show_usage(); myid = getpid() & 0xFFFF; ping(*argv); return EXIT_SUCCESS; } #endif /* ! BB_FEATURE_SIMPLE_PING */ /* * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Mike Muuss. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> * * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ |