cmds.c revision 1.8
1 /* $NetBSD: cmds.c,v 1.8 1997/10/18 07:13:33 lukem Exp $ */ 2 3 /*- 4 * Copyright (c) 1985, 1993 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)cmds.c 8.2 (Berkeley) 3/26/95"; 40 #else 41 __RCSID("$NetBSD: cmds.c,v 1.8 1997/10/18 07:13:33 lukem Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #ifdef sgi 46 #ident "$Revision: 1.8 $" 47 #endif 48 49 #include "timedc.h" 50 #include <sys/file.h> 51 52 #include <netinet/in_systm.h> 53 #include <netinet/ip.h> 54 #include <netinet/ip_icmp.h> 55 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #define TSPTYPES 61 #include <protocols/timed.h> 62 63 #ifdef sgi 64 #include <bstring.h> 65 #include <sys/clock.h> 66 #else 67 #define SECHR (60*60) 68 #define SECDAY (24*SECHR) 69 #endif /* sgi */ 70 71 # define DATE_PROTO "udp" 72 # define DATE_PORT "time" 73 74 75 int sock; 76 int sock_raw; 77 char myname[MAXHOSTNAMELEN]; 78 struct hostent *hp; 79 struct sockaddr_in server; 80 struct sockaddr_in dayaddr; 81 extern int measure_delta; 82 83 void bytenetorder(struct tsp *); 84 void bytehostorder(struct tsp *); 85 86 87 #define BU ((unsigned long)2208988800U) /* seconds before UNIX epoch */ 88 89 90 /* compute the difference between our date and another machine 91 */ 92 static int /* difference in days from our time */ 93 daydiff(char *hostname) 94 { 95 int i; 96 int trials; 97 struct timeval tout, now; 98 fd_set ready; 99 struct sockaddr from; 100 int fromlen; 101 unsigned long sec; 102 103 104 /* wait 2 seconds between 10 tries */ 105 tout.tv_sec = 2; 106 tout.tv_usec = 0; 107 for (trials = 0; trials < 10; trials++) { 108 /* ask for the time */ 109 sec = 0; 110 if (sendto(sock, &sec, sizeof(sec), 0, 111 (struct sockaddr*)&dayaddr, sizeof(dayaddr)) < 0) { 112 perror("sendto(sock)"); 113 return 0; 114 } 115 116 for (;;) { 117 FD_ZERO(&ready); 118 FD_SET(sock, &ready); 119 i = select(sock+1, &ready, (fd_set *)0, 120 (fd_set *)0, &tout); 121 if (i < 0) { 122 if (errno == EINTR) 123 continue; 124 perror("select(date read)"); 125 return 0; 126 } 127 if (0 == i) 128 break; 129 130 fromlen = sizeof(from); 131 if (recvfrom(sock,&sec,sizeof(sec),0, 132 &from,&fromlen) < 0) { 133 perror("recvfrom(date read)"); 134 return 0; 135 } 136 137 sec = ntohl(sec); 138 if (sec < BU) { 139 fprintf(stderr, 140 "%s says it is before 1970: %lu", 141 hostname, sec); 142 return 0; 143 } 144 sec -= BU; 145 146 (void)gettimeofday(&now, (struct timezone*)0); 147 return (sec - now.tv_sec); 148 } 149 } 150 151 /* if we get here, we tried too many times */ 152 fprintf(stderr,"%s will not tell us the date\n", hostname); 153 return 0; 154 } 155 156 157 /* 158 * Clockdiff computes the difference between the time of the machine on 159 * which it is called and the time of the machines given as argument. 160 * The time differences measured by clockdiff are obtained using a sequence 161 * of ICMP TSTAMP messages which are returned to the sender by the IP module 162 * in the remote machine. 163 * In order to compare clocks of machines in different time zones, the time 164 * is transmitted (as a 32-bit value) in milliseconds since midnight UT. 165 * If a hosts uses a different time format, it should set the high order 166 * bit of the 32-bit quantity it transmits. 167 * However, VMS apparently transmits the time in milliseconds since midnight 168 * local time (rather than GMT) without setting the high order bit. 169 * Furthermore, it does not understand daylight-saving time. This makes 170 * clockdiff behaving inconsistently with hosts running VMS. 171 * 172 * In order to reduce the sensitivity to the variance of message transmission 173 * time, clockdiff sends a sequence of messages. Yet, measures between 174 * two `distant' hosts can be affected by a small error. The error can, 175 * however, be reduced by increasing the number of messages sent in each 176 * measurement. 177 */ 178 void 179 clockdiff(argc, argv) 180 int argc; 181 char *argv[]; 182 { 183 int measure_status; 184 extern int measure(u_long, u_long, char *, struct sockaddr_in*, int); 185 register int avg_cnt; 186 register long avg; 187 struct servent *sp; 188 189 if (argc < 2) { 190 printf("Usage: clockdiff host ... \n"); 191 return; 192 } 193 194 (void)gethostname(myname,sizeof(myname)); 195 196 /* get the address for the date ready */ 197 sp = getservbyname(DATE_PORT, DATE_PROTO); 198 if (!sp) { 199 (void)fprintf(stderr, "%s/%s is an unknown service\n", 200 DATE_PORT, DATE_PROTO); 201 dayaddr.sin_port = 0; 202 } else { 203 dayaddr.sin_port = sp->s_port; 204 } 205 206 while (argc > 1) { 207 argc--; argv++; 208 hp = gethostbyname(*argv); 209 if (hp == NULL) { 210 fprintf(stderr, "timedc: %s: ", *argv); 211 herror(0); 212 continue; 213 } 214 215 server.sin_family = hp->h_addrtype; 216 bcopy(hp->h_addr, &server.sin_addr.s_addr, hp->h_length); 217 for (avg_cnt = 0, avg = 0; avg_cnt < 16; avg_cnt++) { 218 measure_status = measure(10000,100, *argv, &server, 1); 219 if (measure_status != GOOD) 220 break; 221 avg += measure_delta; 222 } 223 if (measure_status == GOOD) 224 measure_delta = avg/avg_cnt; 225 226 switch (measure_status) { 227 case HOSTDOWN: 228 printf("%s is down\n", hp->h_name); 229 continue; 230 case NONSTDTIME: 231 printf("%s transmitts a non-standard time format\n", 232 hp->h_name); 233 continue; 234 case UNREACHABLE: 235 printf("%s is unreachable\n", hp->h_name); 236 continue; 237 } 238 239 /* 240 * Try to get the date only after using ICMP timestamps to 241 * get the time. This is because the date protocol 242 * is optional. 243 */ 244 if (dayaddr.sin_port != 0) { 245 dayaddr.sin_family = hp->h_addrtype; 246 bcopy(hp->h_addr, &dayaddr.sin_addr.s_addr, 247 hp->h_length); 248 avg = daydiff(*argv); 249 if (avg > SECDAY) { 250 printf("time on %s is %ld days ahead %s\n", 251 hp->h_name, avg/SECDAY, myname); 252 continue; 253 } else if (avg < -SECDAY) { 254 printf("time on %s is %ld days behind %s\n", 255 hp->h_name, -avg/SECDAY, myname); 256 continue; 257 } 258 } 259 260 if (measure_delta > 0) { 261 printf("time on %s is %d ms. ahead of time on %s\n", 262 hp->h_name, measure_delta, myname); 263 } else if (measure_delta == 0) { 264 printf("%s and %s have the same time\n", 265 hp->h_name, myname); 266 } else { 267 printf("time on %s is %d ms. behind time on %s\n", 268 hp->h_name, -measure_delta, myname); 269 } 270 } 271 return; 272 } 273 274 275 /* 276 * finds location of master timedaemon 277 */ 278 void 279 msite(int argc, char *argv[]) 280 { 281 int cc; 282 fd_set ready; 283 struct sockaddr_in dest; 284 int i, length; 285 struct sockaddr from; 286 struct timeval tout; 287 struct tsp msg; 288 struct servent *srvp; 289 char *tgtname; 290 291 if (argc < 1) { 292 printf("Usage: msite [hostname]\n"); 293 return; 294 } 295 296 srvp = getservbyname("timed", "udp"); 297 if (srvp == 0) { 298 fprintf(stderr, "udp/timed: unknown service\n"); 299 return; 300 } 301 dest.sin_port = srvp->s_port; 302 dest.sin_family = AF_INET; 303 304 (void)gethostname(myname, sizeof(myname)); 305 i = 1; 306 do { 307 tgtname = (i >= argc) ? myname : argv[i]; 308 hp = gethostbyname(tgtname); 309 if (hp == 0) { 310 fprintf(stderr, "timedc: %s: ", tgtname); 311 herror(0); 312 continue; 313 } 314 bcopy(hp->h_addr, &dest.sin_addr.s_addr, hp->h_length); 315 316 (void)strncpy(msg.tsp_name, myname, sizeof(msg.tsp_name) - 1); 317 msg.tsp_type = TSP_MSITE; 318 msg.tsp_vers = TSPVERSION; 319 bytenetorder(&msg); 320 if (sendto(sock, &msg, sizeof(struct tsp), 0, 321 (struct sockaddr*)&dest, 322 sizeof(struct sockaddr)) < 0) { 323 perror("sendto"); 324 continue; 325 } 326 327 tout.tv_sec = 15; 328 tout.tv_usec = 0; 329 FD_ZERO(&ready); 330 FD_SET(sock, &ready); 331 if (select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, 332 &tout)) { 333 length = sizeof(struct sockaddr); 334 cc = recvfrom(sock, &msg, sizeof(struct tsp), 0, 335 &from, &length); 336 if (cc < 0) { 337 perror("recvfrom"); 338 continue; 339 } 340 bytehostorder(&msg); 341 if (msg.tsp_type == TSP_ACK) { 342 printf("master timedaemon at %s is %s\n", 343 tgtname, msg.tsp_name); 344 } else { 345 printf("received wrong ack: %s\n", 346 tsptype[msg.tsp_type]); 347 } 348 } else { 349 printf("communication error with %s\n", tgtname); 350 } 351 } while (++i < argc); 352 } 353 354 /* 355 * quits timedc 356 */ 357 void 358 quit(int argc, char *argv[]) 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: election host1 [host2 ...]\n"); 378 return; 379 } 380 381 srvp = getservbyname("timed", "udp"); 382 if (srvp == 0) { 383 fprintf(stderr, "udp/timed: unknown service\n"); 384 return; 385 } 386 387 while (argc > 1) { 388 argc--; argv++; 389 hp = gethostbyname(*argv); 390 if (hp == NULL) { 391 fprintf(stderr, "timedc: %s: ", *argv); 392 herror(0); 393 argc--; argv++; 394 continue; 395 } 396 sin.sin_port = srvp->s_port; 397 sin.sin_family = hp->h_addrtype; 398 bcopy(hp->h_addr, &sin.sin_addr.s_addr, hp->h_length); 399 400 msg.tsp_type = TSP_TEST; 401 msg.tsp_vers = TSPVERSION; 402 (void)gethostname(myname, sizeof(myname)); 403 (void)strncpy(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 perror("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 from; 426 struct timeval tout; 427 struct tsp msg; 428 struct servent *srvp; 429 430 if (argc != 2) { 431 printf("Usage: tracing { on | off }\n"); 432 return; 433 } 434 435 srvp = getservbyname("timed", "udp"); 436 if (srvp == 0) { 437 fprintf(stderr, "udp/timed: unknown service\n"); 438 return; 439 } 440 dest.sin_port = srvp->s_port; 441 dest.sin_family = AF_INET; 442 443 (void)gethostname(myname,sizeof(myname)); 444 hp = gethostbyname(myname); 445 bcopy(hp->h_addr, &dest.sin_addr.s_addr, hp->h_length); 446 447 if (strcmp(argv[1], "on") == 0) { 448 msg.tsp_type = TSP_TRACEON; 449 onflag = ON; 450 } else { 451 msg.tsp_type = TSP_TRACEOFF; 452 onflag = OFF; 453 } 454 455 (void)strncpy(msg.tsp_name, myname, sizeof(msg.tsp_name) - 1); 456 msg.tsp_vers = TSPVERSION; 457 bytenetorder(&msg); 458 if (sendto(sock, &msg, sizeof(struct tsp), 0, 459 (struct sockaddr*)&dest, sizeof(struct sockaddr)) < 0) { 460 perror("sendto"); 461 return; 462 } 463 464 tout.tv_sec = 5; 465 tout.tv_usec = 0; 466 FD_ZERO(&ready); 467 FD_SET(sock, &ready); 468 if (select(FD_SETSIZE, &ready, (fd_set *)0, (fd_set *)0, &tout)) { 469 length = sizeof(struct sockaddr); 470 cc = recvfrom(sock, &msg, sizeof(struct tsp), 0, 471 &from, &length); 472 if (cc < 0) { 473 perror("recvfrom"); 474 return; 475 } 476 bytehostorder(&msg); 477 if (msg.tsp_type == TSP_ACK) 478 if (onflag) 479 printf("timed tracing enabled\n"); 480 else 481 printf("timed tracing disabled\n"); 482 else 483 printf("wrong ack received: %s\n", 484 tsptype[msg.tsp_type]); 485 } else 486 printf("communication error\n"); 487 } 488 489 int 490 priv_resources() 491 { 492 int port; 493 struct sockaddr_in sin; 494 495 sock = socket(AF_INET, SOCK_DGRAM, 0); 496 if (sock < 0) { 497 perror("opening socket"); 498 return(-1); 499 } 500 501 sin.sin_family = AF_INET; 502 sin.sin_addr.s_addr = 0; 503 for (port = IPPORT_RESERVED - 1; port > IPPORT_RESERVED / 2; port--) { 504 sin.sin_port = htons((u_short)port); 505 if (bind(sock, (struct sockaddr*)&sin, sizeof (sin)) >= 0) 506 break; 507 if (errno != EADDRINUSE && errno != EADDRNOTAVAIL) { 508 perror("bind"); 509 (void) close(sock); 510 return(-1); 511 } 512 } 513 if (port == IPPORT_RESERVED / 2) { 514 fprintf(stderr, "all reserved ports in use\n"); 515 (void) close(sock); 516 return(-1); 517 } 518 519 sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 520 if (sock_raw < 0) { 521 perror("opening raw socket"); 522 (void) close(sock); 523 return(-1); 524 } 525 return(1); 526 } 527
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