ntpdate.c revision 106424
1/* 2 * ntpdate - set the time of day by polling one or more NTP servers 3 */ 4 5#ifdef HAVE_CONFIG_H 6# include <config.h> 7#endif 8 9#ifdef HAVE_NETINFO 10#include <netinfo/ni.h> 11#endif 12 13#include "ntp_machine.h" 14#include "ntp_fp.h" 15#include "ntp.h" 16#include "ntp_io.h" 17#include "ntp_unixtime.h" 18#include "ntpdate.h" 19#include "ntp_string.h" 20#include "ntp_syslog.h" 21#include "ntp_select.h" 22#include "ntp_stdlib.h" 23 24#ifdef HAVE_UNISTD_H 25# include <unistd.h> 26#endif 27 28#include <stdio.h> 29#include <signal.h> 30#include <ctype.h> 31#ifdef HAVE_POLL_H 32# include <poll.h> 33#endif 34#ifndef SYS_WINNT 35# include <netdb.h> 36# ifdef HAVE_SYS_SIGNAL_H 37# include <sys/signal.h> 38# else 39# include <signal.h> 40# endif 41# ifdef HAVE_SYS_IOCTL_H 42# include <sys/ioctl.h> 43# endif 44#endif /* SYS_WINNT */ 45#ifdef HAVE_SYS_RESOURCE_H 46# include <sys/resource.h> 47#endif /* HAVE_SYS_RESOURCE_H */ 48 49#ifdef SYS_VXWORKS 50# include "ioLib.h" 51# include "sockLib.h" 52# include "timers.h" 53 54/* select wants a zero structure ... */ 55struct timeval timeout = {0,0}; 56#else 57struct timeval timeout = {60,0}; 58#endif 59 60#include "recvbuff.h" 61 62#ifdef SYS_WINNT 63# define TARGET_RESOLUTION 1 /* Try for 1-millisecond accuracy 64 on Windows NT timers. */ 65#pragma comment(lib, "winmm") 66#endif /* SYS_WINNT */ 67 68/* 69 * Scheduling priority we run at 70 */ 71#ifndef SYS_VXWORKS 72# define NTPDATE_PRIO (-12) 73#else 74# define NTPDATE_PRIO (100) 75#endif 76 77#if defined(HAVE_TIMER_SETTIME) || defined (HAVE_TIMER_CREATE) 78/* POSIX TIMERS - vxWorks doesn't have itimer - casey */ 79static timer_t ntpdate_timerid; 80#endif 81 82/* 83 * Compatibility stuff for Version 2 84 */ 85#define NTP_MAXSKW 0x28f /* 0.01 sec in fp format */ 86#define NTP_MINDIST 0x51f /* 0.02 sec in fp format */ 87#define PEER_MAXDISP (64*FP_SECOND) /* maximum dispersion (fp 64) */ 88#define NTP_INFIN 15 /* max stratum, infinity a la Bellman-Ford */ 89#define NTP_MAXWGT (8*FP_SECOND) /* maximum select weight 8 seconds */ 90#define NTP_MAXLIST 5 /* maximum select list size */ 91#define PEER_SHIFT 8 /* 8 suitable for crystal time base */ 92 93/* 94 * Debugging flag 95 */ 96volatile int debug = 0; 97 98/* 99 * File descriptor masks etc. for call to select 100 */ 101int fd; 102#ifdef HAVE_POLL_H 103struct pollfd fdmask; 104#else 105fd_set fdmask; 106#endif 107 108/* 109 * Initializing flag. All async routines watch this and only do their 110 * thing when it is clear. 111 */ 112int initializing = 1; 113 114/* 115 * Alarm flag. Set when an alarm occurs 116 */ 117volatile int alarm_flag = 0; 118 119/* 120 * Simple query flag. 121 */ 122int simple_query = 0; 123 124/* 125 * Unpriviledged port flag. 126 */ 127int unpriv_port = 0; 128 129/* 130 * Time to spend measuring drift rate 131 */ 132int rate = 0; 133 134/* 135 * Program name. 136 */ 137char *progname; 138 139/* 140 * Systemwide parameters and flags 141 */ 142int sys_samples = DEFSAMPLES; /* number of samples/server */ 143u_long sys_timeout = DEFTIMEOUT; /* timeout time, in TIMER_HZ units */ 144struct server *sys_servers; /* the server list */ 145int sys_numservers = 0; /* number of servers to poll */ 146int sys_authenticate = 0; /* true when authenticating */ 147u_int32 sys_authkey = 0; /* set to authentication key in use */ 148u_long sys_authdelay = 0; /* authentication delay */ 149int sys_version = NTP_VERSION; /* version to poll with */ 150 151/* 152 * The current internal time 153 */ 154u_long current_time = 0; 155 156/* 157 * Counter for keeping track of completed servers 158 */ 159int complete_servers = 0; 160 161/* 162 * File of encryption keys 163 */ 164 165#ifndef KEYFILE 166# ifndef SYS_WINNT 167#define KEYFILE "/etc/ntp.keys" 168# else 169#define KEYFILE "%windir%\\ntp.keys" 170# endif /* SYS_WINNT */ 171#endif /* KEYFILE */ 172 173#ifndef SYS_WINNT 174const char *key_file = KEYFILE; 175#else 176char key_file_storage[MAX_PATH+1], *key_file ; 177#endif /* SYS_WINNT */ 178 179/* 180 * Miscellaneous flags 181 */ 182int verbose = 0; 183int always_step = 0; 184int never_step = 0; 185 186int ntpdatemain P((int, char **)); 187static void transmit P((struct server *)); 188static void receive P((struct recvbuf *)); 189static void server_data P((struct server *, s_fp, l_fp *, u_fp)); 190static void clock_filter P((struct server *)); 191static struct server *clock_select P((void)); 192static int clock_adjust P((void)); 193static void addserver P((char *)); 194static struct server *findserver P((struct sockaddr_in *)); 195 void timer P((void)); 196static void init_alarm P((void)); 197#ifndef SYS_WINNT 198static RETSIGTYPE alarming P((int)); 199#endif /* SYS_WINNT */ 200static void init_io P((void)); 201static void sendpkt P((struct sockaddr_in *, struct pkt *, int)); 202void input_handler P((void)); 203 204static int l_adj_systime P((l_fp *)); 205static int l_step_systime P((l_fp *)); 206 207static int getnetnum P((const char *, u_int32 *)); 208static void printserver P((struct server *, FILE *)); 209 210#ifdef SYS_WINNT 211int on = 1; 212WORD wVersionRequested; 213WSADATA wsaData; 214HANDLE TimerThreadHandle = NULL; 215#endif /* SYS_WINNT */ 216 217#ifdef NO_MAIN_ALLOWED 218CALL(ntpdate,"ntpdate",ntpdatemain); 219 220void clear_globals() 221{ 222 /* 223 * Debugging flag 224 */ 225 debug = 0; 226 227 ntp_optind = 0; 228 /* 229 * Initializing flag. All async routines watch this and only do their 230 * thing when it is clear. 231 */ 232 initializing = 1; 233 234 /* 235 * Alarm flag. Set when an alarm occurs 236 */ 237 alarm_flag = 0; 238 239 /* 240 * Simple query flag. 241 */ 242 simple_query = 0; 243 244 /* 245 * Unpriviledged port flag. 246 */ 247 unpriv_port = 0; 248 249 /* 250 * Time to spend measuring drift rate 251 */ 252 rate = 0; 253 /* 254 * Systemwide parameters and flags 255 */ 256 sys_numservers = 0; /* number of servers to poll */ 257 sys_authenticate = 0; /* true when authenticating */ 258 sys_authkey = 0; /* set to authentication key in use */ 259 sys_authdelay = 0; /* authentication delay */ 260 sys_version = NTP_VERSION; /* version to poll with */ 261 262 /* 263 * The current internal time 264 */ 265 current_time = 0; 266 267 /* 268 * Counter for keeping track of completed servers 269 */ 270 complete_servers = 0; 271 verbose = 0; 272 always_step = 0; 273 never_step = 0; 274} 275#endif 276 277#ifdef HAVE_NETINFO 278static ni_namelist *getnetinfoservers P((void)); 279#endif 280 281/* 282 * Main program. Initialize us and loop waiting for I/O and/or 283 * timer expiries. 284 */ 285#ifndef NO_MAIN_ALLOWED 286int 287main( 288 int argc, 289 char *argv[] 290 ) 291{ 292 return ntpdatemain (argc, argv); 293} 294#endif /* NO_MAIN_ALLOWED */ 295 296int 297ntpdatemain ( 298 int argc, 299 char *argv[] 300 ) 301{ 302 int was_alarmed; 303 struct recvbuf *rbuflist; 304 struct recvbuf *rbuf; 305 l_fp tmp; 306 int errflg; 307 int c; 308#ifdef HAVE_NETINFO 309 ni_namelist *netinfoservers; 310#endif 311#ifdef SYS_WINNT 312 HANDLE process_handle; 313 314 wVersionRequested = MAKEWORD(1,1); 315 if (WSAStartup(wVersionRequested, &wsaData)) { 316 msyslog(LOG_ERR, "No useable winsock.dll: %m"); 317 exit(1); 318 } 319 320 key_file = key_file_storage; 321 322 if (!ExpandEnvironmentStrings(KEYFILE, key_file, MAX_PATH)) 323 { 324 msyslog(LOG_ERR, "ExpandEnvironmentStrings(KEYFILE) failed: %m\n"); 325 } 326#endif /* SYS_WINNT */ 327 328#ifdef NO_MAIN_ALLOWED 329 clear_globals(); 330#endif 331 332 errflg = 0; 333 progname = argv[0]; 334 syslogit = 0; 335 336 /* 337 * Decode argument list 338 */ 339 while ((c = ntp_getopt(argc, argv, "a:bBde:k:o:p:qr:st:uv")) != EOF) 340 switch (c) 341 { 342 case 'a': 343 c = atoi(ntp_optarg); 344 sys_authenticate = 1; 345 sys_authkey = c; 346 break; 347 case 'b': 348 always_step++; 349 never_step = 0; 350 break; 351 case 'B': 352 never_step++; 353 always_step = 0; 354 break; 355 case 'd': 356 ++debug; 357 break; 358 case 'e': 359 if (!atolfp(ntp_optarg, &tmp) 360 || tmp.l_ui != 0) { 361 (void) fprintf(stderr, 362 "%s: encryption delay %s is unlikely\n", 363 progname, ntp_optarg); 364 errflg++; 365 } else { 366 sys_authdelay = tmp.l_uf; 367 } 368 break; 369 case 'k': 370 key_file = ntp_optarg; 371 break; 372 case 'o': 373 sys_version = atoi(ntp_optarg); 374 break; 375 case 'p': 376 c = atoi(ntp_optarg); 377 if (c <= 0 || c > NTP_SHIFT) { 378 (void) fprintf(stderr, 379 "%s: number of samples (%d) is invalid\n", 380 progname, c); 381 errflg++; 382 } else { 383 sys_samples = c; 384 } 385 break; 386 case 'q': 387 simple_query = 1; 388 break; 389 case 'r': 390 c = atoi(ntp_optarg); 391 if (c <= 0 || c > (60 * 60)) { 392 (void) fprintf(stderr, 393 "%s: rate (%d) is invalid: 0 - %d\n", 394 progname, c, (60 * 60)); 395 errflg++; 396 } else { 397 rate = c; 398 } 399 break; 400 case 's': 401 syslogit = 1; 402 break; 403 case 't': 404 if (!atolfp(ntp_optarg, &tmp)) { 405 (void) fprintf(stderr, 406 "%s: timeout %s is undecodeable\n", 407 progname, ntp_optarg); 408 errflg++; 409 } else { 410 sys_timeout = ((LFPTOFP(&tmp) * TIMER_HZ) 411 + 0x8000) >> 16; 412 if (sys_timeout == 0) 413 sys_timeout = 1; 414 } 415 break; 416 case 'v': 417 verbose = 1; 418 break; 419 case 'u': 420 unpriv_port = 1; 421 break; 422 case '?': 423 ++errflg; 424 break; 425 default: 426 break; 427 } 428 429 if (errflg) { 430 (void) fprintf(stderr, 431 "usage: %s [-bBdqsuv] [-a key#] [-e delay] [-k file] [-p samples] [-o version#] [-r rate] [-t timeo] server ...\n", 432 progname); 433 exit(2); 434 } 435 436 if (debug || simple_query) { 437#ifdef HAVE_SETVBUF 438 static char buf[BUFSIZ]; 439 setvbuf(stdout, buf, _IOLBF, BUFSIZ); 440#else 441 setlinebuf(stdout); 442#endif 443 } 444 445 /* 446 * Logging. Open the syslog if we have to 447 */ 448 if (syslogit) { 449#if !defined (SYS_WINNT) && !defined (SYS_VXWORKS) && !defined SYS_CYGWIN32 450# ifndef LOG_DAEMON 451 openlog("ntpdate", LOG_PID); 452# else 453 454# ifndef LOG_NTP 455# define LOG_NTP LOG_DAEMON 456# endif 457 openlog("ntpdate", LOG_PID | LOG_NDELAY, LOG_NTP); 458 if (debug) 459 setlogmask(LOG_UPTO(LOG_DEBUG)); 460 else 461 setlogmask(LOG_UPTO(LOG_INFO)); 462# endif /* LOG_DAEMON */ 463#endif /* SYS_WINNT */ 464 } 465 466 if (debug || verbose) 467 msyslog(LOG_NOTICE, "%s", Version); 468 469 /* 470 * Add servers we are going to be polling 471 */ 472#ifdef HAVE_NETINFO 473 netinfoservers = getnetinfoservers(); 474#endif 475 476 for ( ; ntp_optind < argc; ntp_optind++) 477 addserver(argv[ntp_optind]); 478 479#ifdef HAVE_NETINFO 480 if (netinfoservers) { 481 if ( netinfoservers->ni_namelist_len && 482 *netinfoservers->ni_namelist_val ) { 483 u_int servercount = 0; 484 while (servercount < netinfoservers->ni_namelist_len) { 485 if (debug) msyslog(LOG_DEBUG, 486 "Adding time server %s from NetInfo configuration.", 487 netinfoservers->ni_namelist_val[servercount]); 488 addserver(netinfoservers->ni_namelist_val[servercount++]); 489 } 490 } 491 ni_namelist_free(netinfoservers); 492 free(netinfoservers); 493 } 494#endif 495 496 if (sys_numservers == 0) { 497 msyslog(LOG_ERR, "no servers can be used, exiting"); 498 exit(1); 499 } 500 501 /* 502 * Initialize the time of day routines and the I/O subsystem 503 */ 504 if (sys_authenticate) { 505 init_auth(); 506 if (!authreadkeys(key_file)) { 507 msyslog(LOG_ERR, "no key file <%s>, exiting", key_file); 508 exit(1); 509 } 510 authtrust(sys_authkey, 1); 511 if (!authistrusted(sys_authkey)) { 512 char buf[10]; 513 514 (void) sprintf(buf, "%lu", (unsigned long)sys_authkey); 515 msyslog(LOG_ERR, "authentication key %s unknown", buf); 516 exit(1); 517 } 518 } 519 init_io(); 520 init_alarm(); 521 522 /* 523 * Set the priority. 524 */ 525#ifdef SYS_VXWORKS 526 taskPrioritySet( taskIdSelf(), NTPDATE_PRIO); 527#endif 528#if defined(HAVE_ATT_NICE) 529 nice (NTPDATE_PRIO); 530#endif 531#if defined(HAVE_BSD_NICE) 532 (void) setpriority(PRIO_PROCESS, 0, NTPDATE_PRIO); 533#endif 534#ifdef SYS_WINNT 535 process_handle = GetCurrentProcess(); 536 if (!SetPriorityClass(process_handle, (DWORD) REALTIME_PRIORITY_CLASS)) { 537 msyslog(LOG_ERR, "SetPriorityClass failed: %m"); 538 } 539#endif /* SYS_WINNT */ 540 541 initializing = 0; 542 543 was_alarmed = 0; 544 rbuflist = (struct recvbuf *)0; 545 while (complete_servers < sys_numservers) { 546#ifdef HAVE_POLL_H 547 struct pollfd rdfdes; 548#else 549 fd_set rdfdes; 550#endif 551 int nfound; 552 553 if (alarm_flag) { /* alarmed? */ 554 was_alarmed = 1; 555 alarm_flag = 0; 556 } 557 rbuflist = getrecvbufs(); /* get received buffers */ 558 559 if (!was_alarmed && rbuflist == (struct recvbuf *)0) { 560 /* 561 * Nothing to do. Wait for something. 562 */ 563 rdfdes = fdmask; 564#ifdef HAVE_POLL_H 565 nfound = poll(&rdfdes, 1, timeout.tv_sec * 1000); 566#else 567 nfound = select(fd+1, &rdfdes, (fd_set *)0, 568 (fd_set *)0, &timeout); 569#endif 570 if (nfound > 0) 571 input_handler(); 572 else if ( 573#ifndef SYS_WINNT 574 nfound == -1 575#else 576 nfound == SOCKET_ERROR 577#endif /* SYS_WINNT */ 578 ) { 579#ifndef SYS_WINNT 580 if (errno != EINTR) 581#endif 582 msyslog(LOG_ERR, 583#ifdef HAVE_POLL_H 584 "poll() error: %m" 585#else 586 "select() error: %m" 587#endif 588 ); 589 } else { 590#ifndef SYS_VXWORKS 591 msyslog(LOG_DEBUG, 592#ifdef HAVE_POLL_H 593 "poll(): nfound = %d, error: %m", 594#else 595 "select(): nfound = %d, error: %m", 596#endif 597 nfound); 598#endif 599 } 600 if (alarm_flag) { /* alarmed? */ 601 was_alarmed = 1; 602 alarm_flag = 0; 603 } 604 rbuflist = getrecvbufs(); /* get received buffers */ 605 } 606 607 /* 608 * Out here, signals are unblocked. Call receive 609 * procedure for each incoming packet. 610 */ 611 while (rbuflist != (struct recvbuf *)0) { 612 rbuf = rbuflist; 613 rbuflist = rbuf->next; 614 receive(rbuf); 615 freerecvbuf(rbuf); 616 } 617 618 /* 619 * Call timer to process any timeouts 620 */ 621 if (was_alarmed) { 622 timer(); 623 was_alarmed = 0; 624 } 625 626 /* 627 * Go around again 628 */ 629 } 630 631 /* 632 * When we get here we've completed the polling of all servers. 633 * Adjust the clock, then exit. 634 */ 635#ifdef SYS_WINNT 636 WSACleanup(); 637#endif 638#ifdef SYS_VXWORKS 639 close (fd); 640 timer_delete(ntpdate_timerid); 641#endif 642 return clock_adjust(); 643} 644 645 646/* 647 * transmit - transmit a packet to the given server, or mark it completed. 648 * This is called by the timeout routine and by the receive 649 * procedure. 650 */ 651static void 652transmit( 653 register struct server *server 654 ) 655{ 656 struct pkt xpkt; 657 658 if (debug) 659 printf("transmit(%s)\n", ntoa(&server->srcadr)); 660 661 if (server->filter_nextpt < server->xmtcnt) { 662 l_fp ts; 663 /* 664 * Last message to this server timed out. Shift 665 * zeros into the filter. 666 */ 667 L_CLR(&ts); 668 server_data(server, 0, &ts, 0); 669 } 670 671 if ((int)server->filter_nextpt >= sys_samples) { 672 /* 673 * Got all the data we need. Mark this guy 674 * completed and return. 675 */ 676 server->event_time = 0; 677 complete_servers++; 678 return; 679 } 680 681 /* 682 * If we're here, send another message to the server. Fill in 683 * the packet and let 'er rip. 684 */ 685 xpkt.li_vn_mode = PKT_LI_VN_MODE(LEAP_NOTINSYNC, 686 sys_version, MODE_CLIENT); 687 xpkt.stratum = STRATUM_TO_PKT(STRATUM_UNSPEC); 688 xpkt.ppoll = NTP_MINPOLL; 689 xpkt.precision = NTPDATE_PRECISION; 690 xpkt.rootdelay = htonl(NTPDATE_DISTANCE); 691 xpkt.rootdispersion = htonl(NTPDATE_DISP); 692 xpkt.refid = htonl(NTPDATE_REFID); 693 L_CLR(&xpkt.reftime); 694 L_CLR(&xpkt.org); 695 L_CLR(&xpkt.rec); 696 697 /* 698 * Determine whether to authenticate or not. If so, 699 * fill in the extended part of the packet and do it. 700 * If not, just timestamp it and send it away. 701 */ 702 if (sys_authenticate) { 703 int len; 704 705 xpkt.exten[0] = htonl(sys_authkey); 706 get_systime(&server->xmt); 707 L_ADDUF(&server->xmt, sys_authdelay); 708 HTONL_FP(&server->xmt, &xpkt.xmt); 709 len = authencrypt(sys_authkey, (u_int32 *)&xpkt, LEN_PKT_NOMAC); 710 sendpkt(&(server->srcadr), &xpkt, (int)(LEN_PKT_NOMAC + len)); 711 712 if (debug > 1) 713 printf("transmit auth to %s\n", 714 ntoa(&(server->srcadr))); 715 } else { 716 get_systime(&(server->xmt)); 717 HTONL_FP(&server->xmt, &xpkt.xmt); 718 sendpkt(&(server->srcadr), &xpkt, LEN_PKT_NOMAC); 719 720 if (debug > 1) 721 printf("transmit to %s\n", ntoa(&(server->srcadr))); 722 } 723 724 /* 725 * Update the server timeout and transmit count 726 */ 727 server->event_time = current_time + sys_timeout; 728 server->xmtcnt++; 729} 730 731 732/* 733 * receive - receive and process an incoming frame 734 */ 735static void 736receive( 737 struct recvbuf *rbufp 738 ) 739{ 740 register struct pkt *rpkt; 741 register struct server *server; 742 register s_fp di; 743 l_fp t10, t23, tmp; 744 l_fp org; 745 l_fp rec; 746 l_fp ci; 747 int has_mac; 748 int is_authentic; 749 750 if (debug) 751 printf("receive(%s)\n", ntoa(&rbufp->recv_srcadr)); 752 /* 753 * Check to see if the packet basically looks like something 754 * intended for us. 755 */ 756 if (rbufp->recv_length == LEN_PKT_NOMAC) 757 has_mac = 0; 758 else if (rbufp->recv_length >= LEN_PKT_NOMAC) 759 has_mac = 1; 760 else { 761 if (debug) 762 printf("receive: packet length %d\n", 763 rbufp->recv_length); 764 return; /* funny length packet */ 765 } 766 767 rpkt = &(rbufp->recv_pkt); 768 if (PKT_VERSION(rpkt->li_vn_mode) < NTP_OLDVERSION || 769 PKT_VERSION(rpkt->li_vn_mode) > NTP_VERSION) { 770 return; 771 } 772 773 if ((PKT_MODE(rpkt->li_vn_mode) != MODE_SERVER 774 && PKT_MODE(rpkt->li_vn_mode) != MODE_PASSIVE) 775 || rpkt->stratum >= STRATUM_UNSPEC) { 776 if (debug) 777 printf("receive: mode %d stratum %d\n", 778 PKT_MODE(rpkt->li_vn_mode), rpkt->stratum); 779 return; 780 } 781 782 /* 783 * So far, so good. See if this is from a server we know. 784 */ 785 server = findserver(&(rbufp->recv_srcadr)); 786 if (server == NULL) { 787 if (debug) 788 printf("receive: server not found\n"); 789 return; 790 } 791 792 /* 793 * Decode the org timestamp and make sure we're getting a response 794 * to our last request. 795 */ 796 NTOHL_FP(&rpkt->org, &org); 797 if (!L_ISEQU(&org, &server->xmt)) { 798 if (debug) 799 printf("receive: pkt.org and peer.xmt differ\n"); 800 return; 801 } 802 803 /* 804 * Check out the authenticity if we're doing that. 805 */ 806 if (!sys_authenticate) 807 is_authentic = 1; 808 else { 809 is_authentic = 0; 810 811 if (debug > 3) 812 printf("receive: rpkt keyid=%ld sys_authkey=%ld decrypt=%ld\n", 813 (long int)ntohl(rpkt->exten[0]), (long int)sys_authkey, 814 (long int)authdecrypt(sys_authkey, (u_int32 *)rpkt, 815 LEN_PKT_NOMAC, (int)(rbufp->recv_length - LEN_PKT_NOMAC))); 816 817 if (has_mac && ntohl(rpkt->exten[0]) == sys_authkey && 818 authdecrypt(sys_authkey, (u_int32 *)rpkt, LEN_PKT_NOMAC, 819 (int)(rbufp->recv_length - LEN_PKT_NOMAC))) 820 is_authentic = 1; 821 if (debug) 822 printf("receive: authentication %s\n", 823 is_authentic ? "passed" : "failed"); 824 } 825 server->trust <<= 1; 826 if (!is_authentic) 827 server->trust |= 1; 828 829 /* 830 * Looks good. Record info from the packet. 831 */ 832 server->leap = PKT_LEAP(rpkt->li_vn_mode); 833 server->stratum = PKT_TO_STRATUM(rpkt->stratum); 834 server->precision = rpkt->precision; 835 server->rootdelay = ntohl(rpkt->rootdelay); 836 server->rootdispersion = ntohl(rpkt->rootdispersion); 837 server->refid = rpkt->refid; 838 NTOHL_FP(&rpkt->reftime, &server->reftime); 839 NTOHL_FP(&rpkt->rec, &rec); 840 NTOHL_FP(&rpkt->xmt, &server->org); 841 842 /* 843 * Make sure the server is at least somewhat sane. If not, try 844 * again. 845 */ 846 if (L_ISZERO(&rec) || !L_ISHIS(&server->org, &rec)) { 847 transmit(server); 848 return; 849 } 850 851 /* 852 * Calculate the round trip delay (di) and the clock offset (ci). 853 * We use the equations (reordered from those in the spec): 854 * 855 * d = (t2 - t3) - (t1 - t0) 856 * c = ((t2 - t3) + (t1 - t0)) / 2 857 */ 858 t10 = server->org; /* pkt.xmt == t1 */ 859 L_SUB(&t10, &rbufp->recv_time); /* recv_time == t0*/ 860 861 t23 = rec; /* pkt.rec == t2 */ 862 L_SUB(&t23, &org); /* pkt->org == t3 */ 863 864 /* now have (t2 - t3) and (t0 - t1). Calculate (ci) and (di) */ 865 /* 866 * Calculate (ci) = ((t1 - t0) / 2) + ((t2 - t3) / 2) 867 * For large offsets this may prevent an overflow on '+' 868 */ 869 ci = t10; 870 L_RSHIFT(&ci); 871 tmp = t23; 872 L_RSHIFT(&tmp); 873 L_ADD(&ci, &tmp); 874 875 /* 876 * Calculate di in t23 in full precision, then truncate 877 * to an s_fp. 878 */ 879 L_SUB(&t23, &t10); 880 di = LFPTOFP(&t23); 881 882 if (debug > 3) 883 printf("offset: %s, delay %s\n", lfptoa(&ci, 6), fptoa(di, 5)); 884 885 di += (FP_SECOND >> (-(int)NTPDATE_PRECISION)) 886 + (FP_SECOND >> (-(int)server->precision)) + NTP_MAXSKW; 887 888 if (di <= 0) { /* value still too raunchy to use? */ 889 L_CLR(&ci); 890 di = 0; 891 } else { 892 di = max(di, NTP_MINDIST); 893 } 894 895 /* 896 * Shift this data in, then transmit again. 897 */ 898 server_data(server, (s_fp) di, &ci, 0); 899 transmit(server); 900} 901 902 903/* 904 * server_data - add a sample to the server's filter registers 905 */ 906static void 907server_data( 908 register struct server *server, 909 s_fp d, 910 l_fp *c, 911 u_fp e 912 ) 913{ 914 register int i; 915 916 i = server->filter_nextpt; 917 if (i < NTP_SHIFT) { 918 server->filter_delay[i] = d; 919 server->filter_offset[i] = *c; 920 server->filter_soffset[i] = LFPTOFP(c); 921 server->filter_error[i] = e; 922 server->filter_nextpt = i + 1; 923 } 924} 925 926 927/* 928 * clock_filter - determine a server's delay, dispersion and offset 929 */ 930static void 931clock_filter( 932 register struct server *server 933 ) 934{ 935 register int i, j; 936 int ord[NTP_SHIFT]; 937 938 /* 939 * Sort indices into increasing delay order 940 */ 941 for (i = 0; i < sys_samples; i++) 942 ord[i] = i; 943 944 for (i = 0; i < (sys_samples-1); i++) { 945 for (j = i+1; j < sys_samples; j++) { 946 if (server->filter_delay[ord[j]] == 0) 947 continue; 948 if (server->filter_delay[ord[i]] == 0 949 || (server->filter_delay[ord[i]] 950 > server->filter_delay[ord[j]])) { 951 register int tmp; 952 953 tmp = ord[i]; 954 ord[i] = ord[j]; 955 ord[j] = tmp; 956 } 957 } 958 } 959 960 /* 961 * Now compute the dispersion, and assign values to delay and 962 * offset. If there are no samples in the register, delay and 963 * offset go to zero and dispersion is set to the maximum. 964 */ 965 if (server->filter_delay[ord[0]] == 0) { 966 server->delay = 0; 967 L_CLR(&server->offset); 968 server->soffset = 0; 969 server->dispersion = PEER_MAXDISP; 970 } else { 971 register s_fp d; 972 973 server->delay = server->filter_delay[ord[0]]; 974 server->offset = server->filter_offset[ord[0]]; 975 server->soffset = LFPTOFP(&server->offset); 976 server->dispersion = 0; 977 for (i = 1; i < sys_samples; i++) { 978 if (server->filter_delay[ord[i]] == 0) 979 d = PEER_MAXDISP; 980 else { 981 d = server->filter_soffset[ord[i]] 982 - server->filter_soffset[ord[0]]; 983 if (d < 0) 984 d = -d; 985 if (d > PEER_MAXDISP) 986 d = PEER_MAXDISP; 987 } 988 /* 989 * XXX This *knows* PEER_FILTER is 1/2 990 */ 991 server->dispersion += (u_fp)(d) >> i; 992 } 993 } 994 /* 995 * We're done 996 */ 997} 998 999 1000/* 1001 * clock_select - select the pick-of-the-litter clock from the samples 1002 * we've got. 1003 */ 1004static struct server * 1005clock_select(void) 1006{ 1007 register struct server *server; 1008 register int i; 1009 register int nlist; 1010 register s_fp d; 1011 register int j; 1012 register int n; 1013 s_fp local_threshold; 1014 struct server *server_list[NTP_MAXCLOCK]; 1015 u_fp server_badness[NTP_MAXCLOCK]; 1016 struct server *sys_server; 1017 1018 /* 1019 * This first chunk of code is supposed to go through all 1020 * servers we know about to find the NTP_MAXLIST servers which 1021 * are most likely to succeed. We run through the list 1022 * doing the sanity checks and trying to insert anyone who 1023 * looks okay. We are at all times aware that we should 1024 * only keep samples from the top two strata and we only need 1025 * NTP_MAXLIST of them. 1026 */ 1027 nlist = 0; /* none yet */ 1028 for (server = sys_servers; server != NULL; server = server->next_server) { 1029 if (server->delay == 0) { 1030 if (debug) 1031 printf("%s: Server dropped: no data\n", ntoa(&server->srcadr)); 1032 continue; /* no data */ 1033 } 1034 if (server->stratum > NTP_INFIN) { 1035 if (debug) 1036 printf("%s: Server dropped: strata too high\n", ntoa(&server->srcadr)); 1037 continue; /* stratum no good */ 1038 } 1039 if (server->delay > NTP_MAXWGT) { 1040 if (debug) 1041 printf("%s: Server dropped: server too far away\n", 1042 ntoa(&server->srcadr)); 1043 continue; /* too far away */ 1044 } 1045 if (server->leap == LEAP_NOTINSYNC) { 1046 if (debug) 1047 printf("%s: Server dropped: Leap not in sync\n", ntoa(&server->srcadr)); 1048 continue; /* he's in trouble */ 1049 } 1050 if (!L_ISHIS(&server->org, &server->reftime)) { 1051 if (debug) 1052 printf("%s: Server dropped: server is very broken\n", 1053 ntoa(&server->srcadr)); 1054 continue; /* very broken host */ 1055 } 1056 if ((server->org.l_ui - server->reftime.l_ui) 1057 >= NTP_MAXAGE) { 1058 if (debug) 1059 printf("%s: Server dropped: Server has gone too long without sync\n", 1060 ntoa(&server->srcadr)); 1061 continue; /* too long without sync */ 1062 } 1063 if (server->trust != 0) { 1064 if (debug) 1065 printf("%s: Server dropped: Server is untrusted\n", 1066 ntoa(&server->srcadr)); 1067 continue; 1068 } 1069 1070 /* 1071 * This one seems sane. Find where he belongs 1072 * on the list. 1073 */ 1074 d = server->dispersion + server->dispersion; 1075 for (i = 0; i < nlist; i++) 1076 if (server->stratum <= server_list[i]->stratum) 1077 break; 1078 for ( ; i < nlist; i++) { 1079 if (server->stratum < server_list[i]->stratum) 1080 break; 1081 if (d < (s_fp) server_badness[i]) 1082 break; 1083 } 1084 1085 /* 1086 * If i points past the end of the list, this 1087 * guy is a loser, else stick him in. 1088 */ 1089 if (i >= NTP_MAXLIST) 1090 continue; 1091 for (j = nlist; j > i; j--) 1092 if (j < NTP_MAXLIST) { 1093 server_list[j] = server_list[j-1]; 1094 server_badness[j] 1095 = server_badness[j-1]; 1096 } 1097 1098 server_list[i] = server; 1099 server_badness[i] = d; 1100 if (nlist < NTP_MAXLIST) 1101 nlist++; 1102 } 1103 1104 /* 1105 * Got the five-or-less best. Cut the list where the number of 1106 * strata exceeds two. 1107 */ 1108 j = 0; 1109 for (i = 1; i < nlist; i++) 1110 if (server_list[i]->stratum > server_list[i-1]->stratum) 1111 if (++j == 2) { 1112 nlist = i; 1113 break; 1114 } 1115 1116 /* 1117 * Whew! What we should have by now is 0 to 5 candidates for 1118 * the job of syncing us. If we have none, we're out of luck. 1119 * If we have one, he's a winner. If we have more, do falseticker 1120 * detection. 1121 */ 1122 1123 if (nlist == 0) 1124 sys_server = 0; 1125 else if (nlist == 1) { 1126 sys_server = server_list[0]; 1127 } else { 1128 /* 1129 * Re-sort by stratum, bdelay estimate quality and 1130 * server.delay. 1131 */ 1132 for (i = 0; i < nlist-1; i++) 1133 for (j = i+1; j < nlist; j++) { 1134 if (server_list[i]->stratum 1135 < server_list[j]->stratum) 1136 break; /* already sorted by stratum */ 1137 if (server_list[i]->delay 1138 < server_list[j]->delay) 1139 continue; 1140 server = server_list[i]; 1141 server_list[i] = server_list[j]; 1142 server_list[j] = server; 1143 } 1144 1145 /* 1146 * Calculate the fixed part of the dispersion limit 1147 */ 1148 local_threshold = (FP_SECOND >> (-(int)NTPDATE_PRECISION)) 1149 + NTP_MAXSKW; 1150 1151 /* 1152 * Now drop samples until we're down to one. 1153 */ 1154 while (nlist > 1) { 1155 for (n = 0; n < nlist; n++) { 1156 server_badness[n] = 0; 1157 for (j = 0; j < nlist; j++) { 1158 if (j == n) /* with self? */ 1159 continue; 1160 d = server_list[j]->soffset 1161 - server_list[n]->soffset; 1162 if (d < 0) /* absolute value */ 1163 d = -d; 1164 /* 1165 * XXX This code *knows* that 1166 * NTP_SELECT is 3/4 1167 */ 1168 for (i = 0; i < j; i++) 1169 d = (d>>1) + (d>>2); 1170 server_badness[n] += d; 1171 } 1172 } 1173 1174 /* 1175 * We now have an array of nlist badness 1176 * coefficients. Find the badest. Find 1177 * the minimum precision while we're at 1178 * it. 1179 */ 1180 i = 0; 1181 n = server_list[0]->precision;; 1182 for (j = 1; j < nlist; j++) { 1183 if (server_badness[j] >= server_badness[i]) 1184 i = j; 1185 if (n > server_list[j]->precision) 1186 n = server_list[j]->precision; 1187 } 1188 1189 /* 1190 * i is the index of the server with the worst 1191 * dispersion. If his dispersion is less than 1192 * the threshold, stop now, else delete him and 1193 * continue around again. 1194 */ 1195 if ( (s_fp) server_badness[i] < (local_threshold 1196 + (FP_SECOND >> (-n)))) 1197 break; 1198 for (j = i + 1; j < nlist; j++) 1199 server_list[j-1] = server_list[j]; 1200 nlist--; 1201 } 1202 1203 /* 1204 * What remains is a list of less than 5 servers. Take 1205 * the best. 1206 */ 1207 sys_server = server_list[0]; 1208 } 1209 1210 /* 1211 * That's it. Return our server. 1212 */ 1213 return sys_server; 1214} 1215 1216 1217/* 1218 * clock_adjust - process what we've received, and adjust the time 1219 * if we got anything decent. 1220 */ 1221static int 1222clock_adjust(void) 1223{ 1224 register struct server *sp, *server; 1225 s_fp absoffset; 1226 int dostep; 1227 1228 for (sp = sys_servers; sp != NULL; sp = sp->next_server) 1229 clock_filter(sp); 1230 server = clock_select(); 1231 1232 if (debug || simple_query) { 1233 for (sp = sys_servers; sp != NULL; sp = sp->next_server) 1234 printserver(sp, stdout); 1235 } 1236 1237 if (server == 0) { 1238 msyslog(LOG_ERR, 1239 "no server suitable for synchronization found"); 1240 return(1); 1241 } 1242 1243 if (always_step) { 1244 dostep = 1; 1245 } else if (never_step) { 1246 dostep = 0; 1247 } else { 1248 absoffset = server->soffset; 1249 if (absoffset < 0) 1250 absoffset = -absoffset; 1251 dostep = (absoffset >= NTPDATE_THRESHOLD || absoffset < 0); 1252 } 1253 1254 if (dostep) { 1255 if (simple_query || l_step_systime(&server->offset)) { 1256 msyslog(LOG_NOTICE, "step time server %s offset %s sec", 1257 ntoa(&server->srcadr), 1258 lfptoa(&server->offset, 6)); 1259 } 1260 } else { 1261#if !defined SYS_WINNT && !defined SYS_CYGWIN32 1262 if (simple_query || l_adj_systime(&server->offset)) { 1263 msyslog(LOG_NOTICE, "adjust time server %s offset %s sec", 1264 ntoa(&server->srcadr), 1265 lfptoa(&server->offset, 6)); 1266 } 1267#else 1268 /* The NT SetSystemTimeAdjustment() call achieves slewing by 1269 * changing the clock frequency. This means that we cannot specify 1270 * it to slew the clock by a definite amount and then stop like 1271 * the Unix adjtime() routine. We can technically adjust the clock 1272 * frequency, have ntpdate sleep for a while, and then wake 1273 * up and reset the clock frequency, but this might cause some 1274 * grief if the user attempts to run ntpd immediately after 1275 * ntpdate and the socket is in use. 1276 */ 1277 printf("\nThe -b option is required by ntpdate on Windows NT platforms\n"); 1278 exit(1); 1279#endif /* SYS_WINNT */ 1280 } 1281 return(0); 1282} 1283 1284 1285/* XXX ELIMINATE: merge BIG slew into adj_systime in lib/systime.c */ 1286/* 1287 * addserver - determine a server's address and allocate a new structure 1288 * for it. 1289 */ 1290static void 1291addserver( 1292 char *serv 1293 ) 1294{ 1295 register struct server *server; 1296 u_int32 netnum; 1297 1298 if (!getnetnum(serv, &netnum)) { 1299 msyslog(LOG_ERR, "can't find host %s\n", serv); 1300 return; 1301 } 1302 1303 server = (struct server *)emalloc(sizeof(struct server)); 1304 memset((char *)server, 0, sizeof(struct server)); 1305 1306 server->srcadr.sin_family = AF_INET; 1307 server->srcadr.sin_addr.s_addr = netnum; 1308 server->srcadr.sin_port = htons(NTP_PORT); 1309 1310 server->event_time = ++sys_numservers; 1311 if (sys_servers == NULL) 1312 sys_servers = server; 1313 else { 1314 struct server *sp; 1315 1316 for (sp = sys_servers; sp->next_server != NULL; 1317 sp = sp->next_server) ; 1318 sp->next_server = server; 1319 } 1320} 1321 1322 1323/* 1324 * findserver - find a server in the list given its address 1325 */ 1326static struct server * 1327findserver( 1328 struct sockaddr_in *addr 1329 ) 1330{ 1331 register u_int32 netnum; 1332 struct server *server; 1333 struct server *mc_server; 1334 1335 mc_server = NULL; 1336 if (htons(addr->sin_port) != NTP_PORT) 1337 return 0; 1338 netnum = addr->sin_addr.s_addr; 1339 1340 for (server = sys_servers; server != NULL; 1341 server = server->next_server) { 1342 register u_int32 servnum; 1343 1344 servnum = server->srcadr.sin_addr.s_addr; 1345 if (netnum == servnum) 1346 return server; 1347 if (IN_MULTICAST(ntohl(servnum))) 1348 mc_server = server; 1349 } 1350 1351 if (mc_server != NULL) { 1352 struct server *sp; 1353 1354 if (mc_server->event_time != 0) { 1355 mc_server->event_time = 0; 1356 complete_servers++; 1357 } 1358 server = (struct server *)emalloc(sizeof(struct server)); 1359 memset((char *)server, 0, sizeof(struct server)); 1360 1361 server->srcadr.sin_family = AF_INET; 1362 server->srcadr.sin_addr.s_addr = netnum; 1363 server->srcadr.sin_port = htons(NTP_PORT); 1364 1365 server->event_time = ++sys_numservers; 1366 for (sp = sys_servers; sp->next_server != NULL; 1367 sp = sp->next_server) ; 1368 sp->next_server = server; 1369 transmit(server); 1370 } 1371 return NULL; 1372} 1373 1374 1375/* 1376 * timer - process a timer interrupt 1377 */ 1378void 1379timer(void) 1380{ 1381 struct server *server; 1382 1383 /* 1384 * Bump the current idea of the time 1385 */ 1386 current_time++; 1387 1388 /* 1389 * Search through the server list looking for guys 1390 * who's event timers have expired. Give these to 1391 * the transmit routine. 1392 */ 1393 for (server = sys_servers; server != NULL; 1394 server = server->next_server) { 1395 if (server->event_time != 0 1396 && server->event_time <= current_time) 1397 transmit(server); 1398 } 1399} 1400 1401 1402/* 1403 * The code duplication in the following subroutine sucks, but 1404 * we need to appease ansi2knr. 1405 */ 1406 1407#ifndef SYS_WINNT 1408/* 1409 * alarming - record the occurance of an alarm interrupt 1410 */ 1411static RETSIGTYPE 1412alarming( 1413 int sig 1414 ) 1415{ 1416 alarm_flag++; 1417} 1418#else 1419void CALLBACK 1420alarming(UINT uTimerID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2) 1421{ 1422 alarm_flag++; 1423} 1424#endif /* SYS_WINNT */ 1425 1426 1427/* 1428 * init_alarm - set up the timer interrupt 1429 */ 1430static void 1431init_alarm(void) 1432{ 1433#ifndef SYS_WINNT 1434# ifndef HAVE_TIMER_SETTIME 1435 struct itimerval itimer; 1436# else 1437 struct itimerspec ntpdate_itimer; 1438# endif 1439#else 1440 TIMECAPS tc; 1441 UINT wTimerRes, wTimerID; 1442# endif /* SYS_WINNT */ 1443#if defined SYS_CYGWIN32 || defined SYS_WINNT 1444 HANDLE hToken; 1445 TOKEN_PRIVILEGES tkp; 1446 DWORD dwUser = 0; 1447#endif /* SYS_WINNT */ 1448 1449 alarm_flag = 0; 1450 1451#ifndef SYS_WINNT 1452# if defined(HAVE_TIMER_CREATE) && defined(HAVE_TIMER_SETTIME) 1453 alarm_flag = 0; 1454 /* this code was put in as setitimer() is non existant this us the 1455 * POSIX "equivalents" setup - casey 1456 */ 1457 /* ntpdate_timerid is global - so we can kill timer later */ 1458 if (timer_create (CLOCK_REALTIME, NULL, &ntpdate_timerid) == 1459# ifdef SYS_VXWORKS 1460 ERROR 1461# else 1462 -1 1463# endif 1464 ) 1465 { 1466 fprintf (stderr, "init_alarm(): timer_create (...) FAILED\n"); 1467 return; 1468 } 1469 1470 /* TIMER_HZ = (5) 1471 * Set up the alarm interrupt. The first comes 1/(2*TIMER_HZ) 1472 * seconds from now and they continue on every 1/TIMER_HZ seconds. 1473 */ 1474 (void) signal_no_reset(SIGALRM, alarming); 1475 ntpdate_itimer.it_interval.tv_sec = ntpdate_itimer.it_value.tv_sec = 0; 1476 ntpdate_itimer.it_interval.tv_nsec = 1000000000/TIMER_HZ; 1477 ntpdate_itimer.it_value.tv_nsec = 1000000000/(TIMER_HZ<<1); 1478 timer_settime(ntpdate_timerid, 0 /* !TIMER_ABSTIME */, &ntpdate_itimer, NULL); 1479# else 1480 /* 1481 * Set up the alarm interrupt. The first comes 1/(2*TIMER_HZ) 1482 * seconds from now and they continue on every 1/TIMER_HZ seconds. 1483 */ 1484 (void) signal_no_reset(SIGALRM, alarming); 1485 itimer.it_interval.tv_sec = itimer.it_value.tv_sec = 0; 1486 itimer.it_interval.tv_usec = 1000000/TIMER_HZ; 1487 itimer.it_value.tv_usec = 1000000/(TIMER_HZ<<1); 1488 setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0); 1489# endif 1490#if defined SYS_CYGWIN32 1491 /* 1492 * Get previleges needed for fiddling with the clock 1493 */ 1494 1495 /* get the current process token handle */ 1496 if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) { 1497 msyslog(LOG_ERR, "OpenProcessToken failed: %m"); 1498 exit(1); 1499 } 1500 /* get the LUID for system-time privilege. */ 1501 LookupPrivilegeValue(NULL, SE_SYSTEMTIME_NAME, &tkp.Privileges[0].Luid); 1502 tkp.PrivilegeCount = 1; /* one privilege to set */ 1503 tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 1504 /* get set-time privilege for this process. */ 1505 AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,(PTOKEN_PRIVILEGES) NULL, 0); 1506 /* cannot test return value of AdjustTokenPrivileges. */ 1507 if (GetLastError() != ERROR_SUCCESS) 1508 msyslog(LOG_ERR, "AdjustTokenPrivileges failed: %m"); 1509#endif 1510#else /* SYS_WINNT */ 1511 _tzset(); 1512 1513 /* 1514 * Get previleges needed for fiddling with the clock 1515 */ 1516 1517 /* get the current process token handle */ 1518 if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) { 1519 msyslog(LOG_ERR, "OpenProcessToken failed: %m"); 1520 exit(1); 1521 } 1522 /* get the LUID for system-time privilege. */ 1523 LookupPrivilegeValue(NULL, SE_SYSTEMTIME_NAME, &tkp.Privileges[0].Luid); 1524 tkp.PrivilegeCount = 1; /* one privilege to set */ 1525 tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; 1526 /* get set-time privilege for this process. */ 1527 AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,(PTOKEN_PRIVILEGES) NULL, 0); 1528 /* cannot test return value of AdjustTokenPrivileges. */ 1529 if (GetLastError() != ERROR_SUCCESS) 1530 msyslog(LOG_ERR, "AdjustTokenPrivileges failed: %m"); 1531 1532 /* 1533 * Set up timer interrupts for every 2**EVENT_TIMEOUT seconds 1534 * Under Win/NT, expiry of timer interval leads to invocation 1535 * of a callback function (on a different thread) rather than 1536 * generating an alarm signal 1537 */ 1538 1539 /* determine max and min resolution supported */ 1540 if(timeGetDevCaps(&tc, sizeof(TIMECAPS)) != TIMERR_NOERROR) { 1541 msyslog(LOG_ERR, "timeGetDevCaps failed: %m"); 1542 exit(1); 1543 } 1544 wTimerRes = min(max(tc.wPeriodMin, TARGET_RESOLUTION), tc.wPeriodMax); 1545 /* establish the minimum timer resolution that we'll use */ 1546 timeBeginPeriod(wTimerRes); 1547 1548 /* start the timer event */ 1549 wTimerID = timeSetEvent( 1550 (UINT) (1000/TIMER_HZ), /* Delay */ 1551 wTimerRes, /* Resolution */ 1552 (LPTIMECALLBACK) alarming, /* Callback function */ 1553 (DWORD) dwUser, /* User data */ 1554 TIME_PERIODIC); /* Event type (periodic) */ 1555 if (wTimerID == 0) { 1556 msyslog(LOG_ERR, "timeSetEvent failed: %m"); 1557 exit(1); 1558 } 1559#endif /* SYS_WINNT */ 1560} 1561 1562 1563 1564 1565/* 1566 * We do asynchronous input using the SIGIO facility. A number of 1567 * recvbuf buffers are preallocated for input. In the signal 1568 * handler we poll to see if the socket is ready and read the 1569 * packets from it into the recvbuf's along with a time stamp and 1570 * an indication of the source host and the interface it was received 1571 * through. This allows us to get as accurate receive time stamps 1572 * as possible independent of other processing going on. 1573 * 1574 * We allocate a number of recvbufs equal to the number of servers 1575 * plus 2. This should be plenty. 1576 */ 1577 1578 1579/* 1580 * init_io - initialize I/O data and open socket 1581 */ 1582static void 1583init_io(void) 1584{ 1585 /* 1586 * Init buffer free list and stat counters 1587 */ 1588 init_recvbuff(sys_numservers + 2); 1589 /* 1590 * Open the socket 1591 */ 1592 1593 /* create a datagram (UDP) socket */ 1594 if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 1595 msyslog(LOG_ERR, "socket() failed: %m"); 1596 exit(1); 1597 /*NOTREACHED*/ 1598 } 1599 1600 /* 1601 * bind the socket to the NTP port 1602 */ 1603 if (!debug && !simple_query && !unpriv_port) { 1604 struct sockaddr_in addr; 1605 1606 memset((char *)&addr, 0, sizeof addr); 1607 addr.sin_family = AF_INET; 1608 addr.sin_port = htons(NTP_PORT); 1609 addr.sin_addr.s_addr = htonl(INADDR_ANY); 1610 if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) { 1611#ifndef SYS_WINNT 1612 if (errno == EADDRINUSE) 1613#else 1614 if (WSAGetLastError() == WSAEADDRINUSE) 1615#endif /* SYS_WINNT */ 1616 msyslog(LOG_ERR, 1617 "the NTP socket is in use, exiting"); 1618 else 1619 msyslog(LOG_ERR, "bind() fails: %m"); 1620 exit(1); 1621 } 1622 } 1623 1624#ifdef HAVE_POLL_H 1625 fdmask.fd = fd; 1626 fdmask.events = POLLIN; 1627#else 1628 FD_ZERO(&fdmask); 1629 FD_SET(fd, &fdmask); 1630#endif 1631 1632 /* 1633 * set non-blocking, 1634 */ 1635#ifndef SYS_WINNT 1636# ifdef SYS_VXWORKS 1637 { 1638 int on = TRUE; 1639 1640 if (ioctl(fd,FIONBIO, &on) == ERROR) { 1641 msyslog(LOG_ERR, "ioctl(FIONBIO) fails: %m"); 1642 exit(1); 1643 } 1644 } 1645# else /* not SYS_VXWORKS */ 1646# if defined(O_NONBLOCK) 1647 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) { 1648 msyslog(LOG_ERR, "fcntl(FNDELAY|FASYNC) fails: %m"); 1649 exit(1); 1650 /*NOTREACHED*/ 1651 } 1652# else /* not O_NONBLOCK */ 1653# if defined(FNDELAY) 1654 if (fcntl(fd, F_SETFL, FNDELAY) < 0) { 1655 msyslog(LOG_ERR, "fcntl(FNDELAY|FASYNC) fails: %m"); 1656 exit(1); 1657 /*NOTREACHED*/ 1658 } 1659# else /* FNDELAY */ 1660# include "Bletch: Need non blocking I/O" 1661# endif /* FNDELAY */ 1662# endif /* not O_NONBLOCK */ 1663# endif /* SYS_VXWORKS */ 1664#else /* SYS_WINNT */ 1665 if (ioctlsocket(fd, FIONBIO, (u_long *) &on) == SOCKET_ERROR) { 1666 msyslog(LOG_ERR, "ioctlsocket(FIONBIO) fails: %m"); 1667 exit(1); 1668 } 1669#endif /* SYS_WINNT */ 1670} 1671 1672 1673/* 1674 * sendpkt - send a packet to the specified destination 1675 */ 1676static void 1677sendpkt( 1678 struct sockaddr_in *dest, 1679 struct pkt *pkt, 1680 int len 1681 ) 1682{ 1683 int cc; 1684 1685#ifdef SYS_WINNT 1686 DWORD err; 1687#endif /* SYS_WINNT */ 1688 1689 cc = sendto(fd, (char *)pkt, (size_t)len, 0, (struct sockaddr *)dest, 1690 sizeof(struct sockaddr_in)); 1691#ifndef SYS_WINNT 1692 if (cc == -1) { 1693 if (errno != EWOULDBLOCK && errno != ENOBUFS) 1694#else 1695 if (cc == SOCKET_ERROR) { 1696 err = WSAGetLastError(); 1697 if (err != WSAEWOULDBLOCK && err != WSAENOBUFS) 1698#endif /* SYS_WINNT */ 1699 msyslog(LOG_ERR, "sendto(%s): %m", ntoa(dest)); 1700 } 1701} 1702 1703 1704/* 1705 * input_handler - receive packets asynchronously 1706 */ 1707void 1708input_handler(void) 1709{ 1710 register int n; 1711 register struct recvbuf *rb; 1712 struct timeval tvzero; 1713 int fromlen; 1714 l_fp ts; 1715#ifdef HAVE_POLL_H 1716 struct pollfd fds; 1717#else 1718 fd_set fds; 1719#endif 1720 1721 /* 1722 * Do a poll to see if we have data 1723 */ 1724 for (;;) { 1725 fds = fdmask; 1726 tvzero.tv_sec = tvzero.tv_usec = 0; 1727#ifdef HAVE_POLL_H 1728 n = poll(&fds, 1, tvzero.tv_sec * 1000); 1729#else 1730 n = select(fd+1, &fds, (fd_set *)0, (fd_set *)0, &tvzero); 1731#endif 1732 1733 /* 1734 * If nothing to do, just return. If an error occurred, 1735 * complain and return. If we've got some, freeze a 1736 * timestamp. 1737 */ 1738 if (n == 0) 1739 return; 1740 else if (n == -1) { 1741 if (errno != EINTR) 1742 msyslog(LOG_ERR, 1743#ifdef HAVE_POLL_H 1744 "poll() error: %m" 1745#else 1746 "select() error: %m" 1747#endif 1748 ); 1749 return; 1750 } 1751 get_systime(&ts); 1752 1753 /* 1754 * Get a buffer and read the frame. If we 1755 * haven't got a buffer, or this is received 1756 * on the wild card socket, just dump the packet. 1757 */ 1758 if (initializing || free_recvbuffs() == 0) { 1759 char buf[100]; 1760 1761#ifndef SYS_WINNT 1762 (void) read(fd, buf, sizeof buf); 1763#else 1764 /* NT's _read does not operate on nonblocking sockets 1765 * either recvfrom or ReadFile() has to be used here. 1766 * ReadFile is used in [ntpd]ntp_intres() and ntpdc, 1767 * just to be different use recvfrom() here 1768 */ 1769 recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr *)0, NULL); 1770#endif /* SYS_WINNT */ 1771 continue; 1772 } 1773 1774 rb = get_free_recv_buffer(); 1775 1776 fromlen = sizeof(struct sockaddr_in); 1777 rb->recv_length = recvfrom(fd, (char *)&rb->recv_pkt, 1778 sizeof(rb->recv_pkt), 0, 1779 (struct sockaddr *)&rb->recv_srcadr, &fromlen); 1780 if (rb->recv_length == -1) { 1781 freerecvbuf(rb); 1782 continue; 1783 } 1784 1785 /* 1786 * Got one. Mark how and when it got here, 1787 * put it on the full list. 1788 */ 1789 rb->recv_time = ts; 1790 add_full_recv_buffer(rb); 1791 } 1792} 1793 1794 1795#if !defined SYS_WINNT && !defined SYS_CYGWIN32 1796/* 1797 * adj_systime - do a big long slew of the system time 1798 */ 1799static int 1800l_adj_systime( 1801 l_fp *ts 1802 ) 1803{ 1804 struct timeval adjtv, oadjtv; 1805 int isneg = 0; 1806 l_fp offset; 1807#ifndef STEP_SLEW 1808 l_fp overshoot; 1809#endif 1810 1811 /* 1812 * Take the absolute value of the offset 1813 */ 1814 offset = *ts; 1815 if (L_ISNEG(&offset)) { 1816 isneg = 1; 1817 L_NEG(&offset); 1818 } 1819 1820#ifndef STEP_SLEW 1821 /* 1822 * Calculate the overshoot. XXX N.B. This code *knows* 1823 * ADJ_OVERSHOOT is 1/2. 1824 */ 1825 overshoot = offset; 1826 L_RSHIFTU(&overshoot); 1827 if (overshoot.l_ui != 0 || (overshoot.l_uf > ADJ_MAXOVERSHOOT)) { 1828 overshoot.l_ui = 0; 1829 overshoot.l_uf = ADJ_MAXOVERSHOOT; 1830 } 1831 L_ADD(&offset, &overshoot); 1832#endif 1833 TSTOTV(&offset, &adjtv); 1834 1835 if (isneg) { 1836 adjtv.tv_sec = -adjtv.tv_sec; 1837 adjtv.tv_usec = -adjtv.tv_usec; 1838 } 1839 1840 if (adjtv.tv_usec != 0 && !debug) { 1841 if (adjtime(&adjtv, &oadjtv) < 0) { 1842 msyslog(LOG_ERR, "Can't adjust the time of day: %m"); 1843 return 0; 1844 } 1845 } 1846 return 1; 1847} 1848#endif /* SYS_WINNT */ 1849 1850 1851/* 1852 * This fuction is not the same as lib/systime step_systime!!! 1853 */ 1854static int 1855l_step_systime( 1856 l_fp *ts 1857 ) 1858{ 1859 double dtemp; 1860 1861#ifdef SLEWALWAYS 1862#ifdef STEP_SLEW 1863 l_fp ftmp; 1864 int isneg; 1865 int n; 1866 1867 if (debug) return 1; 1868 /* 1869 * Take the absolute value of the offset 1870 */ 1871 ftmp = *ts; 1872 if (L_ISNEG(&ftmp)) { 1873 L_NEG(&ftmp); 1874 isneg = 1; 1875 } else 1876 isneg = 0; 1877 1878 if (ftmp.l_ui >= 3) { /* Step it and slew - we might win */ 1879 LFPTOD(ts, dtemp); 1880 n = step_systime(dtemp); 1881 if (!n) 1882 return n; 1883 if (isneg) 1884 ts->l_ui = ~0; 1885 else 1886 ts->l_ui = ~0; 1887 } 1888 /* 1889 * Just add adjustment into the current offset. The update 1890 * routine will take care of bringing the system clock into 1891 * line. 1892 */ 1893#endif 1894 if (debug) 1895 return 1; 1896#ifdef FORCE_NTPDATE_STEP 1897 LFPTOD(ts, dtemp); 1898 return step_systime(dtemp); 1899#else 1900 l_adj_systime(ts); 1901 return 1; 1902#endif 1903#else /* SLEWALWAYS */ 1904 if (debug) 1905 return 1; 1906 LFPTOD(ts, dtemp); 1907 return step_systime(dtemp); 1908#endif /* SLEWALWAYS */ 1909} 1910 1911/* 1912 * getnetnum - given a host name, return its net number 1913 */ 1914static int 1915getnetnum( 1916 const char *host, 1917 u_int32 *num 1918 ) 1919{ 1920 struct hostent *hp; 1921 1922 if (decodenetnum(host, num)) { 1923 return 1; 1924 } else if ((hp = gethostbyname(host)) != 0) { 1925 memmove((char *)num, hp->h_addr, sizeof(u_int32)); 1926 return (1); 1927 } 1928 return (0); 1929} 1930 1931/* XXX ELIMINATE printserver similar in ntptrace.c, ntpdate.c */ 1932/* 1933 * printserver - print detail information for a server 1934 */ 1935static void 1936printserver( 1937 register struct server *pp, 1938 FILE *fp 1939 ) 1940{ 1941 register int i; 1942 char junk[5]; 1943 char *str; 1944 1945 if (!debug) { 1946 (void) fprintf(fp, "server %s, stratum %d, offset %s, delay %s\n", 1947 ntoa(&pp->srcadr), pp->stratum, 1948 lfptoa(&pp->offset, 6), fptoa((s_fp)pp->delay, 5)); 1949 return; 1950 } 1951 1952 (void) fprintf(fp, "server %s, port %d\n", 1953 ntoa(&pp->srcadr), ntohs(pp->srcadr.sin_port)); 1954 1955 (void) fprintf(fp, "stratum %d, precision %d, leap %c%c, trust %03o\n", 1956 pp->stratum, pp->precision, 1957 pp->leap & 0x2 ? '1' : '0', 1958 pp->leap & 0x1 ? '1' : '0', 1959 pp->trust); 1960 1961 if (pp->stratum == 1) { 1962 junk[4] = 0; 1963 memmove(junk, (char *)&pp->refid, 4); 1964 str = junk; 1965 } else { 1966 str = numtoa(pp->refid); 1967 } 1968 (void) fprintf(fp, 1969 "refid [%s], delay %s, dispersion %s\n", 1970 str, fptoa((s_fp)pp->delay, 5), 1971 ufptoa(pp->dispersion, 5)); 1972 1973 (void) fprintf(fp, "transmitted %d, in filter %d\n", 1974 pp->xmtcnt, pp->filter_nextpt); 1975 1976 (void) fprintf(fp, "reference time: %s\n", 1977 prettydate(&pp->reftime)); 1978 (void) fprintf(fp, "originate timestamp: %s\n", 1979 prettydate(&pp->org)); 1980 (void) fprintf(fp, "transmit timestamp: %s\n", 1981 prettydate(&pp->xmt)); 1982 1983 (void) fprintf(fp, "filter delay: "); 1984 for (i = 0; i < NTP_SHIFT; i++) { 1985 (void) fprintf(fp, " %-8.8s", fptoa(pp->filter_delay[i], 5)); 1986 if (i == (NTP_SHIFT>>1)-1) 1987 (void) fprintf(fp, "\n "); 1988 } 1989 (void) fprintf(fp, "\n"); 1990 1991 (void) fprintf(fp, "filter offset:"); 1992 for (i = 0; i < PEER_SHIFT; i++) { 1993 (void) fprintf(fp, " %-8.8s", lfptoa(&pp->filter_offset[i], 6)); 1994 if (i == (PEER_SHIFT>>1)-1) 1995 (void) fprintf(fp, "\n "); 1996 } 1997 (void) fprintf(fp, "\n"); 1998 1999 (void) fprintf(fp, "delay %s, dispersion %s\n", 2000 fptoa((s_fp)pp->delay, 5), ufptoa(pp->dispersion, 5)); 2001 2002 (void) fprintf(fp, "offset %s\n\n", 2003 lfptoa(&pp->offset, 6)); 2004} 2005 2006#if !defined(HAVE_VSPRINTF) 2007int 2008vsprintf( 2009 char *str, 2010 const char *fmt, 2011 va_list ap 2012 ) 2013{ 2014 FILE f; 2015 int len; 2016 2017 f._flag = _IOWRT+_IOSTRG; 2018 f._ptr = str; 2019 f._cnt = 32767; 2020 len = _doprnt(fmt, ap, &f); 2021 *f._ptr = 0; 2022 return (len); 2023} 2024#endif 2025 2026#if 0 2027/* override function in library since SA_RESTART makes ALL syscalls restart */ 2028#ifdef SA_RESTART 2029void 2030signal_no_reset( 2031 int sig, 2032 void (*func)() 2033 ) 2034{ 2035 int n; 2036 struct sigaction vec; 2037 2038 vec.sa_handler = func; 2039 sigemptyset(&vec.sa_mask); 2040 vec.sa_flags = 0; 2041 2042 while (1) 2043 { 2044 n = sigaction(sig, &vec, NULL); 2045 if (n == -1 && errno == EINTR) 2046 continue; 2047 break; 2048 } 2049 if (n == -1) 2050 { 2051 perror("sigaction"); 2052 exit(1); 2053 } 2054} 2055#endif 2056#endif 2057 2058#ifdef HAVE_NETINFO 2059static ni_namelist * 2060getnetinfoservers(void) 2061{ 2062 ni_status status; 2063 void *domain; 2064 ni_id confdir; 2065 ni_namelist *namelist = (ni_namelist*)malloc(sizeof(ni_namelist)); 2066 2067 /* Find a time server in NetInfo */ 2068 if ((status = ni_open(NULL, ".", &domain)) != NI_OK) return NULL; 2069 2070 while (status = ni_pathsearch(domain, &confdir, NETINFO_CONFIG_DIR) == NI_NODIR) { 2071 void *next_domain; 2072 if (ni_open(domain, "..", &next_domain) != NI_OK) break; 2073 ni_free(domain); 2074 domain = next_domain; 2075 } 2076 if (status != NI_OK) return NULL; 2077 2078 NI_INIT(namelist); 2079 if (ni_lookupprop(domain, &confdir, "server", namelist) != NI_OK) { 2080 ni_namelist_free(namelist); 2081 free(namelist); 2082 return NULL; 2083 } 2084 2085 return(namelist); 2086} 2087#endif 2088