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 35 static const 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 41 #if 0 42 static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; 43 #endif 44 static const char rcsid[] = 45 "$Id: rwhod.c,v 1.7 1997/10/13 11:27:55 charnier Exp $"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/socket.h> 50 #include <sys/stat.h> 51 #include <sys/signal.h> 52 #include <sys/ioctl.h> 53 #include <sys/sysctl.h> 54 55 #include <net/if.h> 56 #include <net/if_dl.h> 57 #include <net/route.h> 58 #include <netinet/in.h> 59 #include <protocols/rwhod.h> 60 61 #include <ctype.h> 62 #include <err.h> 63 #include <errno.h> 64 #include <fcntl.h> 65 #include <netdb.h> 66 #include <paths.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <syslog.h> 71 #include <unistd.h> 72 #include <utmp.h> 73 #include <pwd.h> 74 #include <grp.h> 75 76 /* 77 * This version of Berkeley's rwhod has been modified to use IP multicast 78 * datagrams, under control of a new command-line option: 79 * 80 * rwhod -m causes rwhod to use IP multicast (instead of 81 * broadcast or unicast) on all interfaces that have 82 * the IFF_MULTICAST flag set in their "ifnet" structs 83 * (excluding the loopback interface). The multicast 84 * reports are sent with a time-to-live of 1, to prevent 85 * forwarding beyond the directly-connected subnet(s). 86 * 87 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 88 * time-to-live of <ttl>, via a SINGLE interface rather 89 * than all interfaces. <ttl> must be between 0 and 90 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 91 * is different than "-m", in that "-m 1" specifies 92 * transmission on one interface only. 93 * 94 * When "-m" is used without a <ttl> argument, the program accepts multicast 95 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 96 * is given, it accepts multicast reports from only one interface, the one 97 * on which reports are sent (which may be controlled via the host's routing 98 * table). Regardless of the "-m" option, the program accepts broadcast or 99 * unicast reports from all interfaces. Thus, this program will hear the 100 * reports of old, non-multicasting rwhods, but, if multicasting is used, 101 * those old rwhods won't hear the reports generated by this program. 102 * 103 * -- Steve Deering, Stanford University, February 1989 104 */ 105 106 #define UNPRIV_USER "daemon" 107 #define UNPRIV_GROUP "daemon" 108 109 #define NO_MULTICAST 0 /* multicast modes */ 110 #define PER_INTERFACE_MULTICAST 1 111 #define SCOPED_MULTICAST 2 112 113 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 114 115 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 116 /* (belongs in protocols/rwhod.h) */ 117 118 int insecure_mode; 119 int multicast_mode = NO_MULTICAST; 120 int multicast_scope; 121 struct sockaddr_in multicast_addr = { sizeof multicast_addr, AF_INET }; 122 123 /* 124 * Alarm interval. Don't forget to change the down time check in ruptime 125 * if this is changed. 126 */ 127 #define AL_INTERVAL (3 * 60) 128 129 char myname[MAXHOSTNAMELEN]; 130 131 /* 132 * We communicate with each neighbor in a list constructed at the time we're 133 * started up. Neighbors are currently directly connected via a hardware 134 * interface. 135 */ 136 struct neighbor { 137 struct neighbor *n_next; 138 char *n_name; /* interface name */ 139 struct sockaddr *n_addr; /* who to send to */ 140 int n_addrlen; /* size of address */ 141 int n_flags; /* should forward?, interface flags */ 142 }; 143 144 struct neighbor *neighbors; 145 struct whod mywd; 146 struct servent *sp; 147 int s, utmpf; 148 149 #define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we)) 150 151 void run_as __P((uid_t *, gid_t *)); 152 int configure __P((int)); 153 void getboottime __P((int)); 154 void onalrm __P((int)); 155 void quit __P((char *)); 156 void rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *)); 157 int verify __P((char *, int)); 158 static void usage __P((void)); 159 #ifdef DEBUG 160 char *interval __P((int, char *)); 161 void Sendto __P((int, const void *, size_t, int, 162 const struct sockaddr *, int)); 163 #define sendto Sendto 164 #endif 165 166 int 167 main(argc, argv) 168 int argc; 169 char *argv[]; 170 { 171 struct sockaddr_in from; 172 struct stat st; 173 char path[64]; 174 int on = 1; 175 char *cp; 176 struct sockaddr_in sin; 177 uid_t unpriv_uid; 178 gid_t unpriv_gid; 179 180 if (getuid()) 181 errx(1, "not super user"); 182 183 run_as(&unpriv_uid, &unpriv_gid); 184 185 argv++; argc--; 186 while (argc > 0 && *argv[0] == '-') { 187 if (strcmp(*argv, "-m") == 0) { 188 if (argc > 1 && isdigit(*(argv + 1)[0])) { 189 argv++, argc--; 190 multicast_mode = SCOPED_MULTICAST; 191 multicast_scope = atoi(*argv); 192 if (multicast_scope > MAX_MULTICAST_SCOPE) 193 errx(1, "ttl must not exceed %u", 194 MAX_MULTICAST_SCOPE); 195 } 196 else multicast_mode = PER_INTERFACE_MULTICAST; 197 } 198 else if (strcmp(*argv, "-i") == 0) 199 insecure_mode = 1; 200 else 201 usage(); 202 argv++, argc--; 203 } 204 if (argc > 0) 205 usage(); 206 #ifndef DEBUG 207 daemon(1, 0); 208 #endif 209 (void) signal(SIGHUP, getboottime); 210 openlog("rwhod", LOG_PID, LOG_DAEMON); 211 sp = getservbyname("who", "udp"); 212 if (sp == NULL) { 213 syslog(LOG_ERR, "rwhod: udp/who: unknown service\n"); 214 exit(1); 215 } 216 if (chdir(_PATH_RWHODIR) < 0) { 217 syslog(LOG_ERR, "rwhod: %s: %m\n", _PATH_RWHODIR); 218 exit(1); 219 } 220 /* 221 * Establish host name as returned by system. 222 */ 223 if (gethostname(myname, sizeof(myname) - 1) < 0) { 224 syslog(LOG_ERR, "gethostname: %m"); 225 exit(1); 226 } 227 if ((cp = index(myname, '.')) != NULL) 228 *cp = '\0'; 229 strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1); 230 mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0'; 231 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 232 if (utmpf < 0) { 233 syslog(LOG_ERR, "%s: %m", _PATH_UTMP); 234 exit(1); 235 } 236 getboottime(0); 237 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 238 syslog(LOG_ERR, "socket: %m"); 239 exit(1); 240 } 241 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 242 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 243 exit(1); 244 } 245 memset(&sin, 0, sizeof(sin)); 246 sin.sin_len = sizeof(sin); 247 sin.sin_family = AF_INET; 248 sin.sin_port = sp->s_port; 249 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 250 syslog(LOG_ERR, "bind: %m"); 251 exit(1); 252 } 253 setgid(unpriv_gid); 254 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 255 setuid(unpriv_uid); 256 if (!configure(s)) 257 exit(1); 258 signal(SIGALRM, onalrm); 259 onalrm(0); 260 for (;;) { 261 struct whod wd; 262 int cc, whod, len = sizeof(from); 263 264 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 265 (struct sockaddr *)&from, &len); 266 if (cc <= 0) { 267 if (cc < 0 && errno != EINTR) 268 syslog(LOG_WARNING, "recv: %m"); 269 continue; 270 } 271 if (from.sin_port != sp->s_port && !insecure_mode) { 272 syslog(LOG_WARNING, "%d: bad from port", 273 ntohs(from.sin_port)); 274 continue; 275 } 276 if (wd.wd_vers != WHODVERSION) 277 continue; 278 if (wd.wd_type != WHODTYPE_STATUS) 279 continue; 280 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 281 syslog(LOG_WARNING, "malformed host name from %x", 282 from.sin_addr); 283 continue; 284 } 285 (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 286 /* 287 * Rather than truncating and growing the file each time, 288 * use ftruncate if size is less than previous size. 289 */ 290 whod = open(path, O_WRONLY | O_CREAT, 0644); 291 if (whod < 0) { 292 syslog(LOG_WARNING, "%s: %m", path); 293 continue; 294 } 295 #if ENDIAN != BIG_ENDIAN 296 { 297 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 298 struct whoent *we; 299 300 /* undo header byte swapping before writing to file */ 301 wd.wd_sendtime = ntohl(wd.wd_sendtime); 302 for (i = 0; i < 3; i++) 303 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 304 wd.wd_boottime = ntohl(wd.wd_boottime); 305 we = wd.wd_we; 306 for (i = 0; i < n; i++) { 307 we->we_idle = ntohl(we->we_idle); 308 we->we_utmp.out_time = 309 ntohl(we->we_utmp.out_time); 310 we++; 311 } 312 } 313 #endif 314 (void) time((time_t *)&wd.wd_recvtime); 315 (void) write(whod, (char *)&wd, cc); 316 if (fstat(whod, &st) < 0 || st.st_size > cc) 317 ftruncate(whod, cc); 318 (void) close(whod); 319 } 320 } 321 322 static void 323 usage() 324 { 325 fprintf(stderr, "usage: rwhod [-i] [-m [ttl]]\n"); 326 exit(1); 327 } 328 329 void 330 run_as(uid, gid) 331 uid_t *uid; 332 gid_t *gid; 333 { 334 struct passwd *pw; 335 struct group *gr; 336 337 pw = getpwnam(UNPRIV_USER); 338 if (!pw) { 339 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 340 exit(1); 341 } 342 *uid = pw->pw_uid; 343 344 gr = getgrnam(UNPRIV_GROUP); 345 if (!gr) { 346 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 347 exit(1); 348 } 349 *gid = gr->gr_gid; 350 } 351 352 /* 353 * Check out host name for unprintables 354 * and other funnies before allowing a file 355 * to be created. Sorry, but blanks aren't allowed. 356 */ 357 int 358 verify(name, maxlen) 359 register char *name; 360 register int maxlen; 361 { 362 register int size = 0; 363 364 while (*name && size < maxlen - 1) { 365 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 366 return (0); 367 name++, size++; 368 } 369 *name = '\0'; 370 return (size > 0); 371 } 372 373 int utmptime; 374 int utmpent; 375 int utmpsize = 0; 376 struct utmp *utmp; 377 int alarmcount; 378 379 void 380 onalrm(signo) 381 int signo; 382 { 383 register struct neighbor *np; 384 register struct whoent *we = mywd.wd_we, *wlast; 385 register int i; 386 struct stat stb; 387 double avenrun[3]; 388 time_t now; 389 int cc; 390 391 now = time(NULL); 392 if (alarmcount % 10 == 0) 393 getboottime(0); 394 alarmcount++; 395 (void) fstat(utmpf, &stb); 396 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 397 utmptime = stb.st_mtime; 398 if (stb.st_size > utmpsize) { 399 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 400 if (utmp) 401 utmp = (struct utmp *)realloc(utmp, utmpsize); 402 else 403 utmp = (struct utmp *)malloc(utmpsize); 404 if (! utmp) { 405 syslog(LOG_WARNING, "malloc failed"); 406 utmpsize = 0; 407 goto done; 408 } 409 } 410 (void) lseek(utmpf, (off_t)0, L_SET); 411 cc = read(utmpf, (char *)utmp, stb.st_size); 412 if (cc < 0) { 413 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 414 goto done; 415 } 416 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 417 utmpent = cc / sizeof(struct utmp); 418 for (i = 0; i < utmpent; i++) 419 if (utmp[i].ut_name[0]) { 420 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 421 sizeof(utmp[i].ut_line)); 422 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 423 sizeof(utmp[i].ut_name)); 424 we->we_utmp.out_time = htonl(utmp[i].ut_time); 425 if (we >= wlast) 426 break; 427 we++; 428 } 429 utmpent = we - mywd.wd_we; 430 } 431 432 /* 433 * The test on utmpent looks silly---after all, if no one is 434 * logged on, why worry about efficiency?---but is useful on 435 * (e.g.) compute servers. 436 */ 437 if (utmpent && chdir(_PATH_DEV)) { 438 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 439 exit(1); 440 } 441 we = mywd.wd_we; 442 for (i = 0; i < utmpent; i++) { 443 if (stat(we->we_utmp.out_line, &stb) >= 0) 444 we->we_idle = htonl(now - stb.st_atime); 445 we++; 446 } 447 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 448 for (i = 0; i < 3; i++) 449 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 450 cc = (char *)we - (char *)&mywd; 451 mywd.wd_sendtime = htonl(time(0)); 452 mywd.wd_vers = WHODVERSION; 453 mywd.wd_type = WHODTYPE_STATUS; 454 if (multicast_mode == SCOPED_MULTICAST) { 455 (void) sendto(s, (char *)&mywd, cc, 0, 456 (struct sockaddr *)&multicast_addr, 457 sizeof(multicast_addr)); 458 } 459 else for (np = neighbors; np != NULL; np = np->n_next) { 460 if (multicast_mode == PER_INTERFACE_MULTICAST && 461 np->n_flags & IFF_MULTICAST) { 462 /* 463 * Select the outgoing interface for the multicast. 464 */ 465 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 466 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 467 sizeof(struct in_addr)) < 0) { 468 syslog(LOG_ERR, 469 "setsockopt IP_MULTICAST_IF: %m"); 470 exit(1); 471 } 472 (void) sendto(s, (char *)&mywd, cc, 0, 473 (struct sockaddr *)&multicast_addr, 474 sizeof(multicast_addr)); 475 } else (void) sendto(s, (char *)&mywd, cc, 0, 476 np->n_addr, np->n_addrlen); 477 } 478 if (utmpent && chdir(_PATH_RWHODIR)) { 479 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 480 exit(1); 481 } 482 done: 483 (void) alarm(AL_INTERVAL); 484 } 485 486 void 487 getboottime(signo) 488 int signo; 489 { 490 int mib[2]; 491 size_t size; 492 struct timeval tm; 493 494 mib[0] = CTL_KERN; 495 mib[1] = KERN_BOOTTIME; 496 size = sizeof(tm); 497 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 498 syslog(LOG_ERR, "cannot get boottime: %m"); 499 exit(1); 500 } 501 mywd.wd_boottime = htonl(tm.tv_sec); 502 } 503 504 void 505 quit(msg) 506 char *msg; 507 { 508 syslog(LOG_ERR, msg); 509 exit(1); 510 } 511 512 #define ROUNDUP(a) \ 513 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 514 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 515 516 void 517 rt_xaddrs(cp, cplim, rtinfo) 518 register caddr_t cp, cplim; 519 register struct rt_addrinfo *rtinfo; 520 { 521 register struct sockaddr *sa; 522 register int i; 523 524 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 525 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 526 if ((rtinfo->rti_addrs & (1 << i)) == 0) 527 continue; 528 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 529 ADVANCE(cp, sa); 530 } 531 } 532 533 /* 534 * Figure out device configuration and select 535 * networks which deserve status information. 536 */ 537 int 538 configure(s) 539 int s; 540 { 541 register struct neighbor *np; 542 register struct if_msghdr *ifm; 543 register struct ifa_msghdr *ifam; 544 struct sockaddr_dl *sdl; 545 size_t needed; 546 int mib[6], flags = 0, len; 547 char *buf, *lim, *next; 548 struct rt_addrinfo info; 549 550 if (multicast_mode != NO_MULTICAST) { 551 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 552 multicast_addr.sin_port = sp->s_port; 553 } 554 555 if (multicast_mode == SCOPED_MULTICAST) { 556 struct ip_mreq mreq; 557 unsigned char ttl; 558 559 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 560 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 561 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 562 &mreq, sizeof(mreq)) < 0) { 563 syslog(LOG_ERR, 564 "setsockopt IP_ADD_MEMBERSHIP: %m"); 565 return(0); 566 } 567 ttl = multicast_scope; 568 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 569 &ttl, sizeof(ttl)) < 0) { 570 syslog(LOG_ERR, 571 "setsockopt IP_MULTICAST_TTL: %m"); 572 return(0); 573 } 574 return(1); 575 } 576 577 mib[0] = CTL_NET; 578 mib[1] = PF_ROUTE; 579 mib[2] = 0; 580 mib[3] = AF_INET; 581 mib[4] = NET_RT_IFLIST; 582 mib[5] = 0; 583 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 584 quit("route-sysctl-estimate"); 585 if ((buf = malloc(needed)) == NULL) 586 quit("malloc"); 587 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 588 quit("actual retrieval of interface table"); 589 lim = buf + needed; 590 591 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 592 for (next = buf; next < lim; next += ifm->ifm_msglen) { 593 ifm = (struct if_msghdr *)next; 594 if (ifm->ifm_type == RTM_IFINFO) { 595 sdl = (struct sockaddr_dl *)(ifm + 1); 596 flags = ifm->ifm_flags; 597 continue; 598 } 599 if ((flags & IFF_UP) == 0 || 600 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 601 IFF_MULTICAST : 0) | 602 IFF_BROADCAST|IFF_POINTOPOINT)) == 0) 603 continue; 604 if (ifm->ifm_type != RTM_NEWADDR) 605 quit("out of sync parsing NET_RT_IFLIST"); 606 ifam = (struct ifa_msghdr *)ifm; 607 info.rti_addrs = ifam->ifam_addrs; 608 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 609 &info); 610 /* gag, wish we could get rid of Internet dependencies */ 611 #define dstaddr info.rti_info[RTAX_BRD] 612 #define ifaddr info.rti_info[RTAX_IFA] 613 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 614 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 615 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 616 continue; 617 PORT_SA(dstaddr) = sp->s_port; 618 for (np = neighbors; np != NULL; np = np->n_next) 619 if (memcmp(sdl->sdl_data, np->n_name, 620 sdl->sdl_nlen) == 0 && 621 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 622 break; 623 if (np != NULL) 624 continue; 625 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 626 np = (struct neighbor *)malloc(len); 627 if (np == NULL) 628 quit("malloc of neighbor structure"); 629 memset(np, 0, len); 630 np->n_flags = flags; 631 np->n_addr = (struct sockaddr *)(np + 1); 632 np->n_addrlen = dstaddr->sa_len; 633 np->n_name = np->n_addrlen + (char *)np->n_addr; 634 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 635 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 636 if (multicast_mode == PER_INTERFACE_MULTICAST && 637 (flags & IFF_MULTICAST) && 638 !(flags & IFF_LOOPBACK)) { 639 struct ip_mreq mreq; 640 641 memcpy((char *)np->n_addr, (char *)ifaddr, 642 np->n_addrlen); 643 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 644 mreq.imr_interface.s_addr = 645 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 646 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 647 &mreq, sizeof(mreq)) < 0) { 648 syslog(LOG_ERR, 649 "setsockopt IP_ADD_MEMBERSHIP: %m"); 650 #if 0 651 /* Fall back to broadcast on this if. */ 652 np->n_flags &= ~IFF_MULTICAST; 653 #else 654 free((char *)np); 655 continue; 656 #endif 657 } 658 } 659 np->n_next = neighbors; 660 neighbors = np; 661 } 662 free(buf); 663 return (1); 664 } 665 666 #ifdef DEBUG 667 void 668 Sendto(s, buf, cc, flags, to, tolen) 669 int s; 670 const void *buf; 671 size_t cc; 672 int flags; 673 const struct sockaddr *to; 674 int tolen; 675 { 676 register struct whod *w = (struct whod *)buf; 677 register struct whoent *we; 678 struct sockaddr_in *sin = (struct sockaddr_in *)to; 679 680 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 681 ntohs(sin->sin_port)); 682 printf("hostname %s %s\n", w->wd_hostname, 683 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 684 printf("load %4.2f, %4.2f, %4.2f\n", 685 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 686 ntohl(w->wd_loadav[2]) / 100.0); 687 cc -= WHDRSIZE; 688 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 689 time_t t = ntohl(we->we_utmp.out_time); 690 printf("%-8.8s %s:%s %.12s", 691 we->we_utmp.out_name, 692 w->wd_hostname, we->we_utmp.out_line, 693 ctime(&t)+4); 694 we->we_idle = ntohl(we->we_idle) / 60; 695 if (we->we_idle) { 696 if (we->we_idle >= 100*60) 697 we->we_idle = 100*60 - 1; 698 if (we->we_idle >= 60) 699 printf(" %2d", we->we_idle / 60); 700 else 701 printf(" "); 702 printf(":%02d", we->we_idle % 60); 703 } 704 printf("\n"); 705 } 706 } 707 708 char * 709 interval(time, updown) 710 int time; 711 char *updown; 712 { 713 static char resbuf[32]; 714 int days, hours, minutes; 715 716 if (time < 0 || time > 3*30*24*60*60) { 717 (void) sprintf(resbuf, " %s ??:??", updown); 718 return (resbuf); 719 } 720 minutes = (time + 59) / 60; /* round to minutes */ 721 hours = minutes / 60; minutes %= 60; 722 days = hours / 24; hours %= 24; 723 if (days) 724 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 725 updown, days, hours, minutes); 726 else 727 (void) sprintf(resbuf, "%s %2d:%02d", 728 updown, hours, minutes); 729 return (resbuf); 730 } 731 #endif 732