rwhod.c revision 10087
1/* 2 * Copyright (c) 1983, 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 34#ifndef lint 35static char copyright[] = 36"@(#) Copyright (c) 1983, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; 42#endif /* not lint */ 43 44#include <sys/param.h> 45#include <sys/socket.h> 46#include <sys/stat.h> 47#include <sys/signal.h> 48#include <sys/ioctl.h> 49#include <sys/sysctl.h> 50 51#include <net/if.h> 52#include <net/if_dl.h> 53#include <net/route.h> 54#include <netinet/in.h> 55#include <protocols/rwhod.h> 56 57#include <ctype.h> 58#include <errno.h> 59#include <fcntl.h> 60#include <netdb.h> 61#include <paths.h> 62#include <stdio.h> 63#include <stdlib.h> 64#include <string.h> 65#include <syslog.h> 66#include <unistd.h> 67#include <utmp.h> 68 69/* 70 * This version of Berkeley's rwhod has been modified to use IP multicast 71 * datagrams, under control of a new command-line option: 72 * 73 * rwhod -m causes rwhod to use IP multicast (instead of 74 * broadcast or unicast) on all interfaces that have 75 * the IFF_MULTICAST flag set in their "ifnet" structs 76 * (excluding the loopback interface). The multicast 77 * reports are sent with a time-to-live of 1, to prevent 78 * forwarding beyond the directly-connected subnet(s). 79 * 80 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 81 * time-to-live of <ttl>, via a SINGLE interface rather 82 * than all interfaces. <ttl> must be between 0 and 83 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 84 * is different than "-m", in that "-m 1" specifies 85 * transmission on one interface only. 86 * 87 * When "-m" is used without a <ttl> argument, the program accepts multicast 88 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 89 * is given, it accepts multicast reports from only one interface, the one 90 * on which reports are sent (which may be controlled via the host's routing 91 * table). Regardless of the "-m" option, the program accepts broadcast or 92 * unicast reports from all interfaces. Thus, this program will hear the 93 * reports of old, non-multicasting rwhods, but, if multicasting is used, 94 * those old rwhods won't hear the reports generated by this program. 95 * 96 * -- Steve Deering, Stanford University, February 1989 97 */ 98 99#define NO_MULTICAST 0 /* multicast modes */ 100#define PER_INTERFACE_MULTICAST 1 101#define SCOPED_MULTICAST 2 102 103#define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 104 105#define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 106 /* (belongs in protocols/rwhod.h) */ 107 108int multicast_mode = NO_MULTICAST; 109int multicast_scope; 110struct sockaddr_in multicast_addr = { sizeof multicast_addr, AF_INET }; 111 112/* 113 * Alarm interval. Don't forget to change the down time check in ruptime 114 * if this is changed. 115 */ 116#define AL_INTERVAL (3 * 60) 117 118char myname[MAXHOSTNAMELEN]; 119 120/* 121 * We communicate with each neighbor in a list constructed at the time we're 122 * started up. Neighbors are currently directly connected via a hardware 123 * interface. 124 */ 125struct neighbor { 126 struct neighbor *n_next; 127 char *n_name; /* interface name */ 128 struct sockaddr *n_addr; /* who to send to */ 129 int n_addrlen; /* size of address */ 130 int n_flags; /* should forward?, interface flags */ 131}; 132 133struct neighbor *neighbors; 134struct whod mywd; 135struct servent *sp; 136int s, utmpf; 137 138#define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we)) 139 140int configure __P((int)); 141void getboottime __P((int)); 142void onalrm __P((int)); 143void quit __P((char *)); 144void rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *)); 145int verify __P((char *)); 146#ifdef DEBUG 147char *interval __P((int, char *)); 148void Sendto __P((int, char *, int, int, char *, int)); 149#define sendto Sendto 150#endif 151 152int 153main(argc, argv) 154 int argc; 155 char *argv[]; 156{ 157 struct sockaddr_in from; 158 struct stat st; 159 char path[64]; 160 int on = 1; 161 char *cp; 162 struct sockaddr_in sin; 163 164 if (getuid()) { 165 fprintf(stderr, "rwhod: not super user\n"); 166 exit(1); 167 } 168 argv++; argc--; 169 while (argc > 0 && *argv[0] == '-') { 170 if (strcmp(*argv, "-m") == 0) { 171 if (argc > 1 && isdigit(*(argv + 1)[0])) { 172 argv++, argc--; 173 multicast_mode = SCOPED_MULTICAST; 174 multicast_scope = atoi(*argv); 175 if (multicast_scope > MAX_MULTICAST_SCOPE) { 176 fprintf(stderr, 177 "rwhod: ttl must not exceed %u\n", 178 MAX_MULTICAST_SCOPE); 179 exit(1); 180 } 181 } 182 else multicast_mode = PER_INTERFACE_MULTICAST; 183 } 184 else goto usage; 185 argv++, argc--; 186 } 187 if (argc > 0) { 188usage: fprintf(stderr, "usage: rwhod [ -m [ ttl ] ]\n"); 189 exit(1); 190 } 191#ifndef DEBUG 192 daemon(1, 0); 193#endif 194 (void) signal(SIGHUP, getboottime); 195 openlog("rwhod", LOG_PID, LOG_DAEMON); 196 sp = getservbyname("who", "udp"); 197 if (sp == NULL) { 198 syslog(LOG_ERR, "rwhod: udp/who: unknown service\n"); 199 exit(1); 200 } 201 if (chdir(_PATH_RWHODIR) < 0) { 202 syslog(LOG_ERR, "rwhod: %s: %m\n", _PATH_RWHODIR); 203 exit(1); 204 } 205 /* 206 * Establish host name as returned by system. 207 */ 208 if (gethostname(myname, sizeof(myname) - 1) < 0) { 209 syslog(LOG_ERR, "gethostname: %m"); 210 exit(1); 211 } 212 if ((cp = index(myname, '.')) != NULL) 213 *cp = '\0'; 214 strncpy(mywd.wd_hostname, myname, sizeof(myname) - 1); 215 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 216 if (utmpf < 0) { 217 syslog(LOG_ERR, "%s: %m", _PATH_UTMP); 218 exit(1); 219 } 220 getboottime(0); 221 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 222 syslog(LOG_ERR, "socket: %m"); 223 exit(1); 224 } 225 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 226 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 227 exit(1); 228 } 229 memset(&sin, 0, sizeof(sin)); 230 sin.sin_len = sizeof(sin); 231 sin.sin_family = AF_INET; 232 sin.sin_port = sp->s_port; 233 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 234 syslog(LOG_ERR, "bind: %m"); 235 exit(1); 236 } 237 if (!configure(s)) 238 exit(1); 239 signal(SIGALRM, onalrm); 240 onalrm(0); 241 for (;;) { 242 struct whod wd; 243 int cc, whod, len = sizeof(from); 244 245 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 246 (struct sockaddr *)&from, &len); 247 if (cc <= 0) { 248 if (cc < 0 && errno != EINTR) 249 syslog(LOG_WARNING, "recv: %m"); 250 continue; 251 } 252 if (from.sin_port != sp->s_port) { 253 syslog(LOG_WARNING, "%d: bad from port", 254 ntohs(from.sin_port)); 255 continue; 256 } 257 if (wd.wd_vers != WHODVERSION) 258 continue; 259 if (wd.wd_type != WHODTYPE_STATUS) 260 continue; 261 if (!verify(wd.wd_hostname)) { 262 syslog(LOG_WARNING, "malformed host name from %x", 263 from.sin_addr); 264 continue; 265 } 266 (void) sprintf(path, "whod.%s", wd.wd_hostname); 267 /* 268 * Rather than truncating and growing the file each time, 269 * use ftruncate if size is less than previous size. 270 */ 271 whod = open(path, O_WRONLY | O_CREAT, 0644); 272 if (whod < 0) { 273 syslog(LOG_WARNING, "%s: %m", path); 274 continue; 275 } 276#if ENDIAN != BIG_ENDIAN 277 { 278 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 279 struct whoent *we; 280 281 /* undo header byte swapping before writing to file */ 282 wd.wd_sendtime = ntohl(wd.wd_sendtime); 283 for (i = 0; i < 3; i++) 284 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 285 wd.wd_boottime = ntohl(wd.wd_boottime); 286 we = wd.wd_we; 287 for (i = 0; i < n; i++) { 288 we->we_idle = ntohl(we->we_idle); 289 we->we_utmp.out_time = 290 ntohl(we->we_utmp.out_time); 291 we++; 292 } 293 } 294#endif 295 (void) time((time_t *)&wd.wd_recvtime); 296 (void) write(whod, (char *)&wd, cc); 297 if (fstat(whod, &st) < 0 || st.st_size > cc) 298 ftruncate(whod, cc); 299 (void) close(whod); 300 } 301} 302 303/* 304 * Check out host name for unprintables 305 * and other funnies before allowing a file 306 * to be created. Sorry, but blanks aren't allowed. 307 */ 308int 309verify(name) 310 register char *name; 311{ 312 register int size = 0; 313 314 while (*name) { 315 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 316 return (0); 317 name++, size++; 318 } 319 return (size > 0); 320} 321 322int utmptime; 323int utmpent; 324int utmpsize = 0; 325struct utmp *utmp; 326int alarmcount; 327 328void 329onalrm(signo) 330 int signo; 331{ 332 register struct neighbor *np; 333 register struct whoent *we = mywd.wd_we, *wlast; 334 register int i; 335 struct stat stb; 336 double avenrun[3]; 337 time_t now; 338 int cc; 339 340 now = time(NULL); 341 if (alarmcount % 10 == 0) 342 getboottime(0); 343 alarmcount++; 344 (void) fstat(utmpf, &stb); 345 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 346 utmptime = stb.st_mtime; 347 if (stb.st_size > utmpsize) { 348 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 349 if (utmp) 350 utmp = (struct utmp *)realloc(utmp, utmpsize); 351 else 352 utmp = (struct utmp *)malloc(utmpsize); 353 if (! utmp) { 354 fprintf(stderr, "rwhod: malloc failed\n"); 355 utmpsize = 0; 356 goto done; 357 } 358 } 359 (void) lseek(utmpf, (off_t)0, L_SET); 360 cc = read(utmpf, (char *)utmp, stb.st_size); 361 if (cc < 0) { 362 fprintf(stderr, "rwhod: %s: %s\n", 363 _PATH_UTMP, strerror(errno)); 364 goto done; 365 } 366 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 367 utmpent = cc / sizeof(struct utmp); 368 for (i = 0; i < utmpent; i++) 369 if (utmp[i].ut_name[0]) { 370 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 371 sizeof(utmp[i].ut_line)); 372 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 373 sizeof(utmp[i].ut_name)); 374 we->we_utmp.out_time = htonl(utmp[i].ut_time); 375 if (we >= wlast) 376 break; 377 we++; 378 } 379 utmpent = we - mywd.wd_we; 380 } 381 382 /* 383 * The test on utmpent looks silly---after all, if no one is 384 * logged on, why worry about efficiency?---but is useful on 385 * (e.g.) compute servers. 386 */ 387 if (utmpent && chdir(_PATH_DEV)) { 388 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 389 exit(1); 390 } 391 we = mywd.wd_we; 392 for (i = 0; i < utmpent; i++) { 393 if (stat(we->we_utmp.out_line, &stb) >= 0) 394 we->we_idle = htonl(now - stb.st_atime); 395 we++; 396 } 397 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 398 for (i = 0; i < 3; i++) 399 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 400 cc = (char *)we - (char *)&mywd; 401 mywd.wd_sendtime = htonl(time(0)); 402 mywd.wd_vers = WHODVERSION; 403 mywd.wd_type = WHODTYPE_STATUS; 404 if (multicast_mode == SCOPED_MULTICAST) { 405 (void) sendto(s, (char *)&mywd, cc, 0, 406 (struct sockaddr *)&multicast_addr, 407 sizeof(multicast_addr)); 408 } 409 else for (np = neighbors; np != NULL; np = np->n_next) { 410 if (multicast_mode == PER_INTERFACE_MULTICAST && 411 np->n_flags & IFF_MULTICAST) { 412 /* 413 * Select the outgoing interface for the multicast. 414 */ 415 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 416 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 417 sizeof(struct in_addr)) < 0) { 418 syslog(LOG_ERR, 419 "setsockopt IP_MULTICAST_IF: %m"); 420 exit(1); 421 } 422 (void) sendto(s, (char *)&mywd, cc, 0, 423 (struct sockaddr *)&multicast_addr, 424 sizeof(multicast_addr)); 425 } else (void) sendto(s, (char *)&mywd, cc, 0, 426 np->n_addr, np->n_addrlen); 427 } 428 if (utmpent && chdir(_PATH_RWHODIR)) { 429 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 430 exit(1); 431 } 432done: 433 (void) alarm(AL_INTERVAL); 434} 435 436void 437getboottime(signo) 438 int signo; 439{ 440 int mib[2]; 441 size_t size; 442 struct timeval tm; 443 444 mib[0] = CTL_KERN; 445 mib[1] = KERN_BOOTTIME; 446 size = sizeof(tm); 447 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 448 syslog(LOG_ERR, "cannot get boottime: %m"); 449 exit(1); 450 } 451 mywd.wd_boottime = htonl(tm.tv_sec); 452} 453 454void 455quit(msg) 456 char *msg; 457{ 458 syslog(LOG_ERR, msg); 459 exit(1); 460} 461 462#define ROUNDUP(a) \ 463 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 464#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 465 466void 467rt_xaddrs(cp, cplim, rtinfo) 468 register caddr_t cp, cplim; 469 register struct rt_addrinfo *rtinfo; 470{ 471 register struct sockaddr *sa; 472 register int i; 473 474 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 475 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 476 if ((rtinfo->rti_addrs & (1 << i)) == 0) 477 continue; 478 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 479 ADVANCE(cp, sa); 480 } 481} 482 483/* 484 * Figure out device configuration and select 485 * networks which deserve status information. 486 */ 487int 488configure(s) 489 int s; 490{ 491 register struct neighbor *np; 492 register struct if_msghdr *ifm; 493 register struct ifa_msghdr *ifam; 494 struct sockaddr_dl *sdl; 495 size_t needed; 496 int mib[6], flags = 0, len; 497 char *buf, *lim, *next; 498 struct rt_addrinfo info; 499 500 if (multicast_mode != NO_MULTICAST) { 501 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 502 multicast_addr.sin_port = sp->s_port; 503 } 504 505 if (multicast_mode == SCOPED_MULTICAST) { 506 struct ip_mreq mreq; 507 unsigned char ttl; 508 509 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 510 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 511 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 512 &mreq, sizeof(mreq)) < 0) { 513 syslog(LOG_ERR, 514 "setsockopt IP_ADD_MEMBERSHIP: %m"); 515 return(0); 516 } 517 ttl = multicast_scope; 518 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 519 &ttl, sizeof(ttl)) < 0) { 520 syslog(LOG_ERR, 521 "setsockopt IP_MULTICAST_TTL: %m"); 522 return(0); 523 } 524 return(1); 525 } 526 527 mib[0] = CTL_NET; 528 mib[1] = PF_ROUTE; 529 mib[2] = 0; 530 mib[3] = AF_INET; 531 mib[4] = NET_RT_IFLIST; 532 mib[5] = 0; 533 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 534 quit("route-sysctl-estimate"); 535 if ((buf = malloc(needed)) == NULL) 536 quit("malloc"); 537 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 538 quit("actual retrieval of interface table"); 539 lim = buf + needed; 540 541 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 542 for (next = buf; next < lim; next += ifm->ifm_msglen) { 543 ifm = (struct if_msghdr *)next; 544 if (ifm->ifm_type == RTM_IFINFO) { 545 sdl = (struct sockaddr_dl *)(ifm + 1); 546 flags = ifm->ifm_flags; 547 continue; 548 } 549 if ((flags & IFF_UP) == 0 || 550 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 551 IFF_MULTICAST : 0) | 552 IFF_BROADCAST|IFF_POINTOPOINT)) == 0) 553 continue; 554 if (ifm->ifm_type != RTM_NEWADDR) 555 quit("out of sync parsing NET_RT_IFLIST"); 556 ifam = (struct ifa_msghdr *)ifm; 557 info.rti_addrs = ifam->ifam_addrs; 558 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 559 &info); 560 /* gag, wish we could get rid of Internet dependencies */ 561#define dstaddr info.rti_info[RTAX_BRD] 562#define ifaddr info.rti_info[RTAX_IFA] 563#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 564#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 565 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 566 continue; 567 PORT_SA(dstaddr) = sp->s_port; 568 for (np = neighbors; np != NULL; np = np->n_next) 569 if (memcmp(sdl->sdl_data, np->n_name, 570 sdl->sdl_nlen) == 0 && 571 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 572 break; 573 if (np != NULL) 574 continue; 575 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 576 np = (struct neighbor *)malloc(len); 577 if (np == NULL) 578 quit("malloc of neighbor structure"); 579 memset(np, 0, len); 580 np->n_flags = flags; 581 np->n_addr = (struct sockaddr *)(np + 1); 582 np->n_addrlen = dstaddr->sa_len; 583 np->n_name = np->n_addrlen + (char *)np->n_addr; 584 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 585 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 586 if (multicast_mode == PER_INTERFACE_MULTICAST && 587 (flags & IFF_MULTICAST) && 588 !(flags & IFF_LOOPBACK)) { 589 struct ip_mreq mreq; 590 591 memcpy((char *)np->n_addr, (char *)ifaddr, 592 np->n_addrlen); 593 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 594 mreq.imr_interface.s_addr = 595 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 596 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 597 &mreq, sizeof(mreq)) < 0) { 598 syslog(LOG_ERR, 599 "setsockopt IP_ADD_MEMBERSHIP: %m"); 600#if 0 601 /* Fall back to broadcast on this if. */ 602 np->n_flags &= ~IFF_MULTICAST; 603#else 604 free((char *)np); 605 continue; 606#endif 607 } 608 } 609 np->n_next = neighbors; 610 neighbors = np; 611 } 612 free(buf); 613 return (1); 614} 615 616#ifdef DEBUG 617void 618Sendto(s, buf, cc, flags, to, tolen) 619 int s; 620 char *buf; 621 int cc, flags; 622 char *to; 623 int tolen; 624{ 625 register struct whod *w = (struct whod *)buf; 626 register struct whoent *we; 627 struct sockaddr_in *sin = (struct sockaddr_in *)to; 628 629 printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port)); 630 printf("hostname %s %s\n", w->wd_hostname, 631 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 632 printf("load %4.2f, %4.2f, %4.2f\n", 633 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 634 ntohl(w->wd_loadav[2]) / 100.0); 635 cc -= WHDRSIZE; 636 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 637 time_t t = ntohl(we->we_utmp.out_time); 638 printf("%-8.8s %s:%s %.12s", 639 we->we_utmp.out_name, 640 w->wd_hostname, we->we_utmp.out_line, 641 ctime(&t)+4); 642 we->we_idle = ntohl(we->we_idle) / 60; 643 if (we->we_idle) { 644 if (we->we_idle >= 100*60) 645 we->we_idle = 100*60 - 1; 646 if (we->we_idle >= 60) 647 printf(" %2d", we->we_idle / 60); 648 else 649 printf(" "); 650 printf(":%02d", we->we_idle % 60); 651 } 652 printf("\n"); 653 } 654} 655 656char * 657interval(time, updown) 658 int time; 659 char *updown; 660{ 661 static char resbuf[32]; 662 int days, hours, minutes; 663 664 if (time < 0 || time > 3*30*24*60*60) { 665 (void) sprintf(resbuf, " %s ??:??", updown); 666 return (resbuf); 667 } 668 minutes = (time + 59) / 60; /* round to minutes */ 669 hours = minutes / 60; minutes %= 60; 670 days = hours / 24; hours %= 24; 671 if (days) 672 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 673 updown, days, hours, minutes); 674 else 675 (void) sprintf(resbuf, "%s %2d:%02d", 676 updown, hours, minutes); 677 return (resbuf); 678} 679#endif 680