| 1 | /*- |
| 2 | * Copyright (c) 1985, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * @(#)cmds.c 8.1 (Berkeley) 6/6/93 |
| 34 | * $FreeBSD: src/usr.sbin/timed/timedc/cmds.c,v 1.6.2.2 2001/08/31 08:02:06 kris Exp $ |
| 35 | * $DragonFly: src/usr.sbin/timed/timedc/cmds.c,v 1.4 2004/12/18 22:48:14 swildner Exp $ |
| 36 | */ |
| 37 | |
| 38 | #include "timedc.h" |
| 39 | #include <sys/file.h> |
| 40 | |
| 41 | #include <netinet/in_systm.h> |
| 42 | #include <netinet/ip.h> |
| 43 | #include <netinet/ip_icmp.h> |
| 44 | |
| 45 | #include <err.h> |
| 46 | #include <stdlib.h> |
| 47 | #include <string.h> |
| 48 | #include <unistd.h> |
| 49 | |
| 50 | #define TSPTYPES |
| 51 | #include <protocols/timed.h> |
| 52 | |
| 53 | #ifdef sgi |
| 54 | #include <bstring.h> |
| 55 | #include <sys/clock.h> |
| 56 | #else |
| 57 | #define SECHR (60*60) |
| 58 | #define SECDAY (24*SECHR) |
| 59 | #endif /* sgi */ |
| 60 | |
| 61 | # define DATE_PROTO "udp" |
| 62 | # define DATE_PORT "time" |
| 63 | |
| 64 | |
| 65 | int sock; |
| 66 | int sock_raw; |
| 67 | char myname[MAXHOSTNAMELEN]; |
| 68 | struct hostent *hp; |
| 69 | struct sockaddr_in server; |
| 70 | struct sockaddr_in dayaddr; |
| 71 | extern int measure_delta; |
| 72 | |
| 73 | void bytenetorder(struct tsp *); |
| 74 | void bytehostorder(struct tsp *); |
| 75 | |
| 76 | |
| 77 | #define BU (2208988800UL) /* seconds before UNIX epoch */ |
| 78 | |
| 79 | |
| 80 | /* compute the difference between our date and another machine |
| 81 | */ |
| 82 | static int /* difference in days from our time */ |
| 83 | daydiff(char *hostname) |
| 84 | { |
| 85 | int i; |
| 86 | int trials; |
| 87 | struct timeval tout, now; |
| 88 | fd_set ready; |
| 89 | struct sockaddr from; |
| 90 | int fromlen; |
| 91 | unsigned long sec; |
| 92 | |
| 93 | /* wait 2 seconds between 10 tries */ |
| 94 | tout.tv_sec = 2; |
| 95 | tout.tv_usec = 0; |
| 96 | for (trials = 0; trials < 10; trials++) { |
| 97 | /* ask for the time */ |
| 98 | sec = 0; |
| 99 | if (sendto(sock, &sec, sizeof(sec), 0, |
| 100 | (struct sockaddr*)&dayaddr, sizeof(dayaddr)) < 0) { |
| 101 | warn("sendto(sock)"); |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | for (;;) { |
| 106 | FD_ZERO(&ready); |
| 107 | FD_SET(sock, &ready); |
| 108 | i = select(sock+1, &ready, NULL, NULL, &tout); |
| 109 | if (i < 0) { |
| 110 | if (errno == EINTR) |
| 111 | continue; |
| 112 | warn("select(date read)"); |
| 113 | return 0; |
| 114 | } |
| 115 | if (0 == i) |
| 116 | break; |
| 117 | |
| 118 | fromlen = sizeof(from); |
| 119 | if (recvfrom(sock,&sec,sizeof(sec),0, |
| 120 | &from,&fromlen) < 0) { |
| 121 | warn("recvfrom(date read)"); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | sec = ntohl(sec); |
| 126 | if (sec < BU) { |
| 127 | warnx("%s says it is before 1970: %lu", |
| 128 | hostname, sec); |
| 129 | return 0; |
| 130 | } |
| 131 | sec -= BU; |
| 132 | |
| 133 | gettimeofday(&now, NULL); |
| 134 | return (sec - now.tv_sec); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | /* if we get here, we tried too many times */ |
| 139 | warnx("%s will not tell us the date", hostname); |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | |
| 144 | /* |
| 145 | * Clockdiff computes the difference between the time of the machine on |
| 146 | * which it is called and the time of the machines given as argument. |
| 147 | * The time differences measured by clockdiff are obtained using a sequence |
| 148 | * of ICMP TSTAMP messages which are returned to the sender by the IP module |
| 149 | * in the remote machine. |
| 150 | * In order to compare clocks of machines in different time zones, the time |
| 151 | * is transmitted (as a 32-bit value) in milliseconds since midnight UT. |
| 152 | * If a hosts uses a different time format, it should set the high order |
| 153 | * bit of the 32-bit quantity it transmits. |
| 154 | * However, VMS apparently transmits the time in milliseconds since midnight |
| 155 | * local time (rather than GMT) without setting the high order bit. |
| 156 | * Furthermore, it does not understand daylight-saving time. This makes |
| 157 | * clockdiff behaving inconsistently with hosts running VMS. |
| 158 | * |
| 159 | * In order to reduce the sensitivity to the variance of message transmission |
| 160 | * time, clockdiff sends a sequence of messages. Yet, measures between |
| 161 | * two `distant' hosts can be affected by a small error. The error can, |
| 162 | * however, be reduced by increasing the number of messages sent in each |
| 163 | * measurement. |
| 164 | */ |
| 165 | void |
| 166 | clockdiff(int argc, char *argv[]) |
| 167 | { |
| 168 | int measure_status; |
| 169 | extern int measure(u_long, u_long, char *, struct sockaddr_in*, int); |
| 170 | int avg_cnt; |
| 171 | long avg; |
| 172 | struct servent *sp; |
| 173 | |
| 174 | if (argc < 2) { |
| 175 | printf("usage: timedc clockdiff host ...\n"); |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | if (gethostname(myname, sizeof(myname) - 1) < 0) |
| 180 | err(1, "gethostname"); |
| 181 | |
| 182 | /* get the address for the date ready */ |
| 183 | sp = getservbyname(DATE_PORT, DATE_PROTO); |
| 184 | if (!sp) { |
| 185 | warnx("%s/%s is an unknown service", DATE_PORT, DATE_PROTO); |
| 186 | dayaddr.sin_port = 0; |
| 187 | } else { |
| 188 | dayaddr.sin_port = sp->s_port; |
| 189 | } |
| 190 | |
| 191 | while (argc > 1) { |
| 192 | argc--; argv++; |
| 193 | hp = gethostbyname(*argv); |
| 194 | if (hp == NULL) { |
| 195 | warnx("%s: %s", *argv, hstrerror(h_errno)); |
| 196 | continue; |
| 197 | } |
| 198 | |
| 199 | server.sin_family = hp->h_addrtype; |
| 200 | bcopy(hp->h_addr, &server.sin_addr.s_addr, hp->h_length); |
| 201 | for (avg_cnt = 0, avg = 0; avg_cnt < 16; avg_cnt++) { |
| 202 | measure_status = measure(10000,100, *argv, &server, 1); |
| 203 | if (measure_status != GOOD) |
| 204 | break; |
| 205 | avg += measure_delta; |
| 206 | } |
| 207 | if (measure_status == GOOD) |
| 208 | measure_delta = avg/avg_cnt; |
| 209 | |
| 210 | switch (measure_status) { |
| 211 | case HOSTDOWN: |
| 212 | printf("%s is down\n", hp->h_name); |
| 213 | continue; |
| 214 | case NONSTDTIME: |
| 215 | printf("%s transmitts a non-standard time format\n", |
| 216 | hp->h_name); |
| 217 | continue; |
| 218 | case UNREACHABLE: |
| 219 | printf("%s is unreachable\n", hp->h_name); |
| 220 | continue; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Try to get the date only after using ICMP timestamps to |
| 225 | * get the time. This is because the date protocol |
| 226 | * is optional. |
| 227 | */ |
| 228 | if (dayaddr.sin_port != 0) { |
| 229 | dayaddr.sin_family = hp->h_addrtype; |
| 230 | bcopy(hp->h_addr, &dayaddr.sin_addr.s_addr, |
| 231 | hp->h_length); |
| 232 | avg = daydiff(*argv); |
| 233 | if (avg > SECDAY) { |
| 234 | printf("time on %s is %ld days ahead %s\n", |
| 235 | hp->h_name, avg/SECDAY, myname); |
| 236 | continue; |
| 237 | } else if (avg < -SECDAY) { |
| 238 | printf("time on %s is %ld days behind %s\n", |
| 239 | hp->h_name, -avg/SECDAY, myname); |
| 240 | continue; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | if (measure_delta > 0) { |
| 245 | printf("time on %s is %d ms. ahead of time on %s\n", |
| 246 | hp->h_name, measure_delta, myname); |
| 247 | } else if (measure_delta == 0) { |
| 248 | printf("%s and %s have the same time\n", |
| 249 | hp->h_name, myname); |
| 250 | } else { |
| 251 | printf("time on %s is %d ms. behind time on %s\n", |
| 252 | hp->h_name, -measure_delta, myname); |
| 253 | } |
| 254 | } |
| 255 | return; |
| 256 | } |
| 257 | |
| 258 | |
| 259 | /* |
| 260 | * finds location of master timedaemon |
| 261 | */ |
| 262 | void |
| 263 | msite(int argc, char *argv[]) |
| 264 | { |
| 265 | int cc; |
| 266 | fd_set ready; |
| 267 | struct sockaddr_in dest; |
| 268 | int i, length; |
| 269 | struct sockaddr_in from; |
| 270 | struct timeval tout; |
| 271 | struct tsp msg; |
| 272 | struct servent *srvp; |
| 273 | char *tgtname; |
| 274 | |
| 275 | if (argc < 1) { |
| 276 | printf("usage: timedc msite [host ...]\n"); |
| 277 | return; |
| 278 | } |
| 279 | |
| 280 | srvp = getservbyname("timed", "udp"); |
| 281 | if (srvp == 0) { |
| 282 | warnx("udp/timed: unknown service"); |
| 283 | return; |
| 284 | } |
| 285 | dest.sin_port = srvp->s_port; |
| 286 | dest.sin_family = AF_INET; |
| 287 | |
| 288 | if (gethostname(myname, sizeof(myname) - 1) < 0) |
| 289 | err(1, "gethostname"); |
| 290 | i = 1; |
| 291 | do { |
| 292 | tgtname = (i >= argc) ? myname : argv[i]; |
| 293 | hp = gethostbyname(tgtname); |
| 294 | if (hp == 0) { |
| 295 | warnx("%s: %s", tgtname, hstrerror(h_errno)); |
| 296 | continue; |
| 297 | } |
| 298 | bcopy(hp->h_addr, &dest.sin_addr.s_addr, hp->h_length); |
| 299 | |
| 300 | strlcpy(msg.tsp_name, myname, sizeof(msg.tsp_name)); |
| 301 | msg.tsp_type = TSP_MSITE; |
| 302 | msg.tsp_vers = TSPVERSION; |
| 303 | bytenetorder(&msg); |
| 304 | if (sendto(sock, &msg, sizeof(struct tsp), 0, |
| 305 | (struct sockaddr*)&dest, |
| 306 | sizeof(struct sockaddr)) < 0) { |
| 307 | warn("sendto"); |
| 308 | continue; |
| 309 | } |
| 310 | |
| 311 | tout.tv_sec = 15; |
| 312 | tout.tv_usec = 0; |
| 313 | FD_ZERO(&ready); |
| 314 | FD_SET(sock, &ready); |
| 315 | if (select(FD_SETSIZE, &ready, NULL, NULL, &tout)) { |
| 316 | length = sizeof(from); |
| 317 | cc = recvfrom(sock, &msg, sizeof(struct tsp), 0, |
| 318 | (struct sockaddr *)&from, &length); |
| 319 | if (cc < 0) { |
| 320 | warn("recvfrom"); |
| 321 | continue; |
| 322 | } |
| 323 | /* |
| 324 | * The 4.3BSD protocol spec had a 32-byte tsp_name field, and |
| 325 | * this is still OS-dependent. Demand that the packet is at |
| 326 | * least long enough to hold a 4.3BSD packet. |
| 327 | */ |
| 328 | if (cc < (sizeof(struct tsp) - MAXHOSTNAMELEN + 32)) { |
| 329 | fprintf(stderr, |
| 330 | "short packet (%d/%zu bytes) from %s\n", |
| 331 | cc, sizeof(struct tsp) - MAXHOSTNAMELEN + 32, |
| 332 | inet_ntoa(from.sin_addr)); |
| 333 | continue; |
| 334 | } |
| 335 | bytehostorder(&msg); |
| 336 | if (msg.tsp_type == TSP_ACK) { |
| 337 | printf("master timedaemon at %s is %s\n", |
| 338 | tgtname, msg.tsp_name); |
| 339 | } else { |
| 340 | if (msg.tsp_type >= TSPTYPENUMBER) |
| 341 | printf("unknown ack received: %u\n", |
| 342 | msg.tsp_type); |
| 343 | else |
| 344 | printf("wrong ack received: %s\n", |
| 345 | tsptype[msg.tsp_type]); |
| 346 | } |
| 347 | } else { |
| 348 | printf("communication error with %s\n", tgtname); |
| 349 | } |
| 350 | } while (++i < argc); |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * quits timedc |
| 355 | */ |
| 356 | void |
| 357 | quit(void) |
| 358 | { |
| 359 | |
| 360 | exit(0); |
| 361 | } |
| 362 | |
| 363 | |
| 364 | /* |
| 365 | * Causes the election timer to expire on the selected hosts |
| 366 | * It sends just one udp message per machine, relying on |
| 367 | * reliability of communication channel. |
| 368 | */ |
| 369 | void |
| 370 | testing(int argc, char *argv[]) |
| 371 | { |
| 372 | struct servent *srvp; |
| 373 | struct sockaddr_in sin; |
| 374 | struct tsp msg; |
| 375 | |
| 376 | if (argc < 2) { |
| 377 | printf("usage: timedc election host1 [host2 ...]\n"); |
| 378 | return; |
| 379 | } |
| 380 | |
| 381 | srvp = getservbyname("timed", "udp"); |
| 382 | if (srvp == 0) { |
| 383 | warnx("udp/timed: unknown service"); |
| 384 | return; |
| 385 | } |
| 386 | |
| 387 | while (argc > 1) { |
| 388 | argc--; argv++; |
| 389 | hp = gethostbyname(*argv); |
| 390 | if (hp == NULL) { |
| 391 | warnx("%s: %s", *argv, hstrerror(h_errno)); |
| 392 | argc--; argv++; |
| 393 | continue; |
| 394 | } |
| 395 | sin.sin_port = srvp->s_port; |
| 396 | sin.sin_family = hp->h_addrtype; |
| 397 | bcopy(hp->h_addr, &sin.sin_addr.s_addr, hp->h_length); |
| 398 | |
| 399 | msg.tsp_type = TSP_TEST; |
| 400 | msg.tsp_vers = TSPVERSION; |
| 401 | if (gethostname(myname, sizeof(myname) - 1) < 0) |
| 402 | err(1, "gethostname"); |
| 403 | strlcpy(msg.tsp_name, myname, sizeof(msg.tsp_name)); |
| 404 | bytenetorder(&msg); |
| 405 | if (sendto(sock, &msg, sizeof(struct tsp), 0, |
| 406 | (struct sockaddr*)&sin, |
| 407 | sizeof(struct sockaddr)) < 0) { |
| 408 | warn("sendto"); |
| 409 | } |
| 410 | } |
| 411 | } |
| 412 | |
| 413 | |
| 414 | /* |
| 415 | * Enables or disables tracing on local timedaemon |
| 416 | */ |
| 417 | void |
| 418 | tracing(int argc, char *argv[]) |
| 419 | { |
| 420 | int onflag; |
| 421 | int length; |
| 422 | int cc; |
| 423 | fd_set ready; |
| 424 | struct sockaddr_in dest; |
| 425 | struct sockaddr_in from; |
| 426 | struct timeval tout; |
| 427 | struct tsp msg; |
| 428 | struct servent *srvp; |
| 429 | |
| 430 | if (argc != 2) { |
| 431 | printf("usage: timedc trace { on | off }\n"); |
| 432 | return; |
| 433 | } |
| 434 | |
| 435 | srvp = getservbyname("timed", "udp"); |
| 436 | if (srvp == 0) { |
| 437 | warnx("udp/timed: unknown service"); |
| 438 | return; |
| 439 | } |
| 440 | dest.sin_port = srvp->s_port; |
| 441 | dest.sin_family = AF_INET; |
| 442 | |
| 443 | if (gethostname(myname, sizeof(myname) - 1) < 0) |
| 444 | err(1, "gethostname"); |
| 445 | hp = gethostbyname(myname); |
| 446 | bcopy(hp->h_addr, &dest.sin_addr.s_addr, hp->h_length); |
| 447 | |
| 448 | if (strcmp(argv[1], "on") == 0) { |
| 449 | msg.tsp_type = TSP_TRACEON; |
| 450 | onflag = ON; |
| 451 | } else { |
| 452 | msg.tsp_type = TSP_TRACEOFF; |
| 453 | onflag = OFF; |
| 454 | } |
| 455 | |
| 456 | strcpy(msg.tsp_name, myname); |
| 457 | msg.tsp_vers = TSPVERSION; |
| 458 | bytenetorder(&msg); |
| 459 | if (sendto(sock, &msg, sizeof(struct tsp), 0, |
| 460 | (struct sockaddr*)&dest, sizeof(struct sockaddr)) < 0) { |
| 461 | warn("sendto"); |
| 462 | return; |
| 463 | } |
| 464 | |
| 465 | tout.tv_sec = 5; |
| 466 | tout.tv_usec = 0; |
| 467 | FD_ZERO(&ready); |
| 468 | FD_SET(sock, &ready); |
| 469 | if (select(FD_SETSIZE, &ready, NULL, NULL, &tout)) { |
| 470 | length = sizeof(from); |
| 471 | cc = recvfrom(sock, &msg, sizeof(struct tsp), 0, |
| 472 | (struct sockaddr *)&from, &length); |
| 473 | if (cc < 0) { |
| 474 | warn("recvfrom"); |
| 475 | return; |
| 476 | } |
| 477 | /* |
| 478 | * The 4.3BSD protocol spec had a 32-byte tsp_name field, and |
| 479 | * this is still OS-dependent. Demand that the packet is at |
| 480 | * least long enough to hold a 4.3BSD packet. |
| 481 | */ |
| 482 | if (cc < (sizeof(struct tsp) - MAXHOSTNAMELEN + 32)) { |
| 483 | fprintf(stderr, "short packet (%d/%zu bytes) from %s\n", |
| 484 | cc, sizeof(struct tsp) - MAXHOSTNAMELEN + 32, |
| 485 | inet_ntoa(from.sin_addr)); |
| 486 | return; |
| 487 | } |
| 488 | bytehostorder(&msg); |
| 489 | if (msg.tsp_type == TSP_ACK) |
| 490 | if (onflag) |
| 491 | printf("timed tracing enabled\n"); |
| 492 | else |
| 493 | printf("timed tracing disabled\n"); |
| 494 | else { |
| 495 | if (msg.tsp_type >= TSPTYPENUMBER) |
| 496 | printf("unknown ack received: %u\n", |
| 497 | msg.tsp_type); |
| 498 | else |
| 499 | printf("wrong ack received: %s\n", |
| 500 | tsptype[msg.tsp_type]); |
| 501 | } |
| 502 | } else |
| 503 | printf("communication error\n"); |
| 504 | } |
| 505 | |
| 506 | int |
| 507 | priv_resources(void) |
| 508 | { |
| 509 | int port; |
| 510 | struct sockaddr_in sin; |
| 511 | |
| 512 | sock = socket(AF_INET, SOCK_DGRAM, 0); |
| 513 | if (sock < 0) { |
| 514 | warn("opening socket"); |
| 515 | return(-1); |
| 516 | } |
| 517 | |
| 518 | sin.sin_family = AF_INET; |
| 519 | sin.sin_addr.s_addr = 0; |
| 520 | for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) { |
| 521 | sin.sin_port = htons((u_short)port); |
| 522 | if (bind(sock, (struct sockaddr*)&sin, sizeof (sin)) >= 0) |
| 523 | break; |
| 524 | if (errno != EADDRINUSE && errno != EADDRNOTAVAIL) { |
| 525 | warn("bind"); |
| 526 | close(sock); |
| 527 | return(-1); |
| 528 | } |
| 529 | } |
| 530 | if (port == IPPORT_RESERVED / 2) { |
| 531 | warnx("all reserved ports in use"); |
| 532 | close(sock); |
| 533 | return(-1); |
| 534 | } |
| 535 | |
| 536 | sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| 537 | if (sock_raw < 0) { |
| 538 | warn("opening raw socket"); |
| 539 | close(sock); |
| 540 | return(-1); |
| 541 | } |
| 542 | return(1); |
| 543 | } |