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 "$FreeBSD$"; 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 quiet_mode; 120 int iff_flag = IFF_POINTOPOINT; 121 int multicast_mode = NO_MULTICAST; 122 int multicast_scope; 123 struct sockaddr_in multicast_addr = { sizeof multicast_addr, AF_INET }; 124 125 /* 126 * Alarm interval. Don't forget to change the down time check in ruptime 127 * if this is changed. 128 */ 129 #define AL_INTERVAL (3 * 60) 130 131 char myname[MAXHOSTNAMELEN]; 132 133 /* 134 * We communicate with each neighbor in a list constructed at the time we're 135 * started up. Neighbors are currently directly connected via a hardware 136 * interface. 137 */ 138 struct neighbor { 139 struct neighbor *n_next; 140 char *n_name; /* interface name */ 141 struct sockaddr *n_addr; /* who to send to */ 142 int n_addrlen; /* size of address */ 143 int n_flags; /* should forward?, interface flags */ 144 }; 145 146 struct neighbor *neighbors; 147 struct whod mywd; 148 struct servent *sp; 149 int s, utmpf; 150 151 #define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we)) 152 153 void run_as __P((uid_t *, gid_t *)); 154 int configure __P((int)); 155 void getboottime __P((int)); 156 void onalrm __P((int)); 157 void quit __P((char *)); 158 void rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *)); 159 int verify __P((char *, int)); 160 static void usage __P((void)); 161 #ifdef DEBUG 162 char *interval __P((int, char *)); 163 void Sendto __P((int, const void *, size_t, int, 164 const struct sockaddr *, int)); 165 #define sendto Sendto 166 #endif 167 168 int 169 main(argc, argv) 170 int argc; 171 char *argv[]; 172 { 173 struct sockaddr_in from; 174 struct stat st; 175 char path[64]; 176 int on = 1; 177 char *cp; 178 struct sockaddr_in sin; 179 uid_t unpriv_uid; 180 gid_t unpriv_gid; 181 182 if (getuid()) 183 errx(1, "not super user"); 184 185 run_as(&unpriv_uid, &unpriv_gid); 186 187 argv++; argc--; 188 while (argc > 0 && *argv[0] == '-') { 189 if (strcmp(*argv, "-m") == 0) { 190 if (argc > 1 && isdigit(*(argv + 1)[0])) { 191 argv++, argc--; 192 multicast_mode = SCOPED_MULTICAST; 193 multicast_scope = atoi(*argv); 194 if (multicast_scope > MAX_MULTICAST_SCOPE) 195 errx(1, "ttl must not exceed %u", 196 MAX_MULTICAST_SCOPE); 197 } 198 else multicast_mode = PER_INTERFACE_MULTICAST; 199 } 200 else if (strcmp(*argv, "-i") == 0) 201 insecure_mode = 1; 202 else if (strcmp(*argv, "-l") == 0) 203 quiet_mode = 1; 204 else if (strcmp(*argv, "-p") == 0) 205 iff_flag = 0; 206 else 207 usage(); 208 argv++, argc--; 209 } 210 if (argc > 0) 211 usage(); 212 #ifndef DEBUG 213 daemon(1, 0); 214 #endif 215 (void) signal(SIGHUP, getboottime); 216 openlog("rwhod", LOG_PID, LOG_DAEMON); 217 sp = getservbyname("who", "udp"); 218 if (sp == NULL) { 219 syslog(LOG_ERR, "udp/who: unknown service"); 220 exit(1); 221 } 222 if (chdir(_PATH_RWHODIR) < 0) { 223 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 224 exit(1); 225 } 226 /* 227 * Establish host name as returned by system. 228 */ 229 if (gethostname(myname, sizeof(myname) - 1) < 0) { 230 syslog(LOG_ERR, "gethostname: %m"); 231 exit(1); 232 } 233 if ((cp = index(myname, '.')) != NULL) 234 *cp = '\0'; 235 strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1); 236 mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0'; 237 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 238 if (utmpf < 0) { 239 syslog(LOG_ERR, "%s: %m", _PATH_UTMP); 240 exit(1); 241 } 242 getboottime(0); 243 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 244 syslog(LOG_ERR, "socket: %m"); 245 exit(1); 246 } 247 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 248 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 249 exit(1); 250 } 251 memset(&sin, 0, sizeof(sin)); 252 sin.sin_len = sizeof(sin); 253 sin.sin_family = AF_INET; 254 sin.sin_port = sp->s_port; 255 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 256 syslog(LOG_ERR, "bind: %m"); 257 exit(1); 258 } 259 setgid(unpriv_gid); 260 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 261 setuid(unpriv_uid); 262 if (!configure(s)) 263 exit(1); 264 if (!quiet_mode) { 265 signal(SIGALRM, onalrm); 266 onalrm(0); 267 } 268 for (;;) { 269 struct whod wd; 270 int cc, whod, len = sizeof(from); 271 272 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 273 (struct sockaddr *)&from, &len); 274 if (cc <= 0) { 275 if (cc < 0 && errno != EINTR) 276 syslog(LOG_WARNING, "recv: %m"); 277 continue; 278 } 279 if (from.sin_port != sp->s_port && !insecure_mode) { 280 syslog(LOG_WARNING, "%d: bad from port", 281 ntohs(from.sin_port)); 282 continue; 283 } 284 if (wd.wd_vers != WHODVERSION) 285 continue; 286 if (wd.wd_type != WHODTYPE_STATUS) 287 continue; 288 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 289 syslog(LOG_WARNING, "malformed host name from %x", 290 from.sin_addr); 291 continue; 292 } 293 (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 294 /* 295 * Rather than truncating and growing the file each time, 296 * use ftruncate if size is less than previous size. 297 */ 298 whod = open(path, O_WRONLY | O_CREAT, 0644); 299 if (whod < 0) { 300 syslog(LOG_WARNING, "%s: %m", path); 301 continue; 302 } 303 #if ENDIAN != BIG_ENDIAN 304 { 305 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 306 struct whoent *we; 307 308 /* undo header byte swapping before writing to file */ 309 wd.wd_sendtime = ntohl(wd.wd_sendtime); 310 for (i = 0; i < 3; i++) 311 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 312 wd.wd_boottime = ntohl(wd.wd_boottime); 313 we = wd.wd_we; 314 for (i = 0; i < n; i++) { 315 we->we_idle = ntohl(we->we_idle); 316 we->we_utmp.out_time = 317 ntohl(we->we_utmp.out_time); 318 we++; 319 } 320 } 321 #endif 322 (void) time((time_t *)&wd.wd_recvtime); 323 (void) write(whod, (char *)&wd, cc); 324 if (fstat(whod, &st) < 0 || st.st_size > cc) 325 ftruncate(whod, cc); 326 (void) close(whod); 327 } 328 } 329 330 static void 331 usage() 332 { 333 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 334 exit(1); 335 } 336 337 void 338 run_as(uid, gid) 339 uid_t *uid; 340 gid_t *gid; 341 { 342 struct passwd *pw; 343 struct group *gr; 344 345 pw = getpwnam(UNPRIV_USER); 346 if (!pw) { 347 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 348 exit(1); 349 } 350 *uid = pw->pw_uid; 351 352 gr = getgrnam(UNPRIV_GROUP); 353 if (!gr) { 354 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 355 exit(1); 356 } 357 *gid = gr->gr_gid; 358 } 359 360 /* 361 * Check out host name for unprintables 362 * and other funnies before allowing a file 363 * to be created. Sorry, but blanks aren't allowed. 364 */ 365 int 366 verify(name, maxlen) 367 register char *name; 368 register int maxlen; 369 { 370 register int size = 0; 371 372 while (*name && size < maxlen - 1) { 373 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 374 return (0); 375 name++, size++; 376 } 377 *name = '\0'; 378 return (size > 0); 379 } 380 381 int utmptime; 382 int utmpent; 383 int utmpsize = 0; 384 struct utmp *utmp; 385 int alarmcount; 386 387 void 388 onalrm(signo) 389 int signo; 390 { 391 register struct neighbor *np; 392 register struct whoent *we = mywd.wd_we, *wlast; 393 register int i; 394 struct stat stb; 395 double avenrun[3]; 396 time_t now; 397 int cc; 398 399 now = time(NULL); 400 if (alarmcount % 10 == 0) 401 getboottime(0); 402 alarmcount++; 403 (void) fstat(utmpf, &stb); 404 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 405 utmptime = stb.st_mtime; 406 if (stb.st_size > utmpsize) { 407 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 408 if (utmp) 409 utmp = (struct utmp *)realloc(utmp, utmpsize); 410 else 411 utmp = (struct utmp *)malloc(utmpsize); 412 if (! utmp) { 413 syslog(LOG_WARNING, "malloc failed"); 414 utmpsize = 0; 415 goto done; 416 } 417 } 418 (void) lseek(utmpf, (off_t)0, L_SET); 419 cc = read(utmpf, (char *)utmp, stb.st_size); 420 if (cc < 0) { 421 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 422 goto done; 423 } 424 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 425 utmpent = cc / sizeof(struct utmp); 426 for (i = 0; i < utmpent; i++) 427 if (utmp[i].ut_name[0]) { 428 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 429 sizeof(utmp[i].ut_line)); 430 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 431 sizeof(utmp[i].ut_name)); 432 we->we_utmp.out_time = htonl(utmp[i].ut_time); 433 if (we >= wlast) 434 break; 435 we++; 436 } 437 utmpent = we - mywd.wd_we; 438 } 439 440 /* 441 * The test on utmpent looks silly---after all, if no one is 442 * logged on, why worry about efficiency?---but is useful on 443 * (e.g.) compute servers. 444 */ 445 if (utmpent && chdir(_PATH_DEV)) { 446 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 447 exit(1); 448 } 449 we = mywd.wd_we; 450 for (i = 0; i < utmpent; i++) { 451 if (stat(we->we_utmp.out_line, &stb) >= 0) 452 we->we_idle = htonl(now - stb.st_atime); 453 we++; 454 } 455 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 456 for (i = 0; i < 3; i++) 457 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 458 cc = (char *)we - (char *)&mywd; 459 mywd.wd_sendtime = htonl(time(0)); 460 mywd.wd_vers = WHODVERSION; 461 mywd.wd_type = WHODTYPE_STATUS; 462 if (multicast_mode == SCOPED_MULTICAST) { 463 (void) sendto(s, (char *)&mywd, cc, 0, 464 (struct sockaddr *)&multicast_addr, 465 sizeof(multicast_addr)); 466 } 467 else for (np = neighbors; np != NULL; np = np->n_next) { 468 if (multicast_mode == PER_INTERFACE_MULTICAST && 469 np->n_flags & IFF_MULTICAST) { 470 /* 471 * Select the outgoing interface for the multicast. 472 */ 473 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 474 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 475 sizeof(struct in_addr)) < 0) { 476 syslog(LOG_ERR, 477 "setsockopt IP_MULTICAST_IF: %m"); 478 exit(1); 479 } 480 (void) sendto(s, (char *)&mywd, cc, 0, 481 (struct sockaddr *)&multicast_addr, 482 sizeof(multicast_addr)); 483 } else (void) sendto(s, (char *)&mywd, cc, 0, 484 np->n_addr, np->n_addrlen); 485 } 486 if (utmpent && chdir(_PATH_RWHODIR)) { 487 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 488 exit(1); 489 } 490 done: 491 (void) alarm(AL_INTERVAL); 492 } 493 494 void 495 getboottime(signo) 496 int signo; 497 { 498 int mib[2]; 499 size_t size; 500 struct timeval tm; 501 502 mib[0] = CTL_KERN; 503 mib[1] = KERN_BOOTTIME; 504 size = sizeof(tm); 505 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 506 syslog(LOG_ERR, "cannot get boottime: %m"); 507 exit(1); 508 } 509 mywd.wd_boottime = htonl(tm.tv_sec); 510 } 511 512 void 513 quit(msg) 514 char *msg; 515 { 516 syslog(LOG_ERR, "%s", msg); 517 exit(1); 518 } 519 520 #define ROUNDUP(a) \ 521 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 522 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 523 524 void 525 rt_xaddrs(cp, cplim, rtinfo) 526 register caddr_t cp, cplim; 527 register struct rt_addrinfo *rtinfo; 528 { 529 register struct sockaddr *sa; 530 register int i; 531 532 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 533 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 534 if ((rtinfo->rti_addrs & (1 << i)) == 0) 535 continue; 536 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 537 ADVANCE(cp, sa); 538 } 539 } 540 541 /* 542 * Figure out device configuration and select 543 * networks which deserve status information. 544 */ 545 int 546 configure(s) 547 int s; 548 { 549 register struct neighbor *np; 550 register struct if_msghdr *ifm; 551 register struct ifa_msghdr *ifam; 552 struct sockaddr_dl *sdl; 553 size_t needed; 554 int mib[6], flags = 0, len; 555 char *buf, *lim, *next; 556 struct rt_addrinfo info; 557 558 if (multicast_mode != NO_MULTICAST) { 559 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 560 multicast_addr.sin_port = sp->s_port; 561 } 562 563 if (multicast_mode == SCOPED_MULTICAST) { 564 struct ip_mreq mreq; 565 unsigned char ttl; 566 567 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 568 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 569 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 570 &mreq, sizeof(mreq)) < 0) { 571 syslog(LOG_ERR, 572 "setsockopt IP_ADD_MEMBERSHIP: %m"); 573 return(0); 574 } 575 ttl = multicast_scope; 576 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 577 &ttl, sizeof(ttl)) < 0) { 578 syslog(LOG_ERR, 579 "setsockopt IP_MULTICAST_TTL: %m"); 580 return(0); 581 } 582 return(1); 583 } 584 585 mib[0] = CTL_NET; 586 mib[1] = PF_ROUTE; 587 mib[2] = 0; 588 mib[3] = AF_INET; 589 mib[4] = NET_RT_IFLIST; 590 mib[5] = 0; 591 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 592 quit("route-sysctl-estimate"); 593 if ((buf = malloc(needed)) == NULL) 594 quit("malloc"); 595 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 596 quit("actual retrieval of interface table"); 597 lim = buf + needed; 598 599 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 600 for (next = buf; next < lim; next += ifm->ifm_msglen) { 601 ifm = (struct if_msghdr *)next; 602 if (ifm->ifm_type == RTM_IFINFO) { 603 sdl = (struct sockaddr_dl *)(ifm + 1); 604 flags = ifm->ifm_flags; 605 continue; 606 } 607 if ((flags & IFF_UP) == 0 || 608 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 609 IFF_MULTICAST : 0) | 610 IFF_BROADCAST|iff_flag)) == 0) 611 continue; 612 if (ifm->ifm_type != RTM_NEWADDR) 613 quit("out of sync parsing NET_RT_IFLIST"); 614 ifam = (struct ifa_msghdr *)ifm; 615 info.rti_addrs = ifam->ifam_addrs; 616 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 617 &info); 618 /* gag, wish we could get rid of Internet dependencies */ 619 #define dstaddr info.rti_info[RTAX_BRD] 620 #define ifaddr info.rti_info[RTAX_IFA] 621 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 622 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 623 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 624 continue; 625 PORT_SA(dstaddr) = sp->s_port; 626 for (np = neighbors; np != NULL; np = np->n_next) 627 if (memcmp(sdl->sdl_data, np->n_name, 628 sdl->sdl_nlen) == 0 && 629 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 630 break; 631 if (np != NULL) 632 continue; 633 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 634 np = (struct neighbor *)malloc(len); 635 if (np == NULL) 636 quit("malloc of neighbor structure"); 637 memset(np, 0, len); 638 np->n_flags = flags; 639 np->n_addr = (struct sockaddr *)(np + 1); 640 np->n_addrlen = dstaddr->sa_len; 641 np->n_name = np->n_addrlen + (char *)np->n_addr; 642 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 643 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 644 if (multicast_mode == PER_INTERFACE_MULTICAST && 645 (flags & IFF_MULTICAST) && 646 !(flags & IFF_LOOPBACK)) { 647 struct ip_mreq mreq; 648 649 memcpy((char *)np->n_addr, (char *)ifaddr, 650 np->n_addrlen); 651 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 652 mreq.imr_interface.s_addr = 653 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 654 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 655 &mreq, sizeof(mreq)) < 0) { 656 syslog(LOG_ERR, 657 "setsockopt IP_ADD_MEMBERSHIP: %m"); 658 #if 0 659 /* Fall back to broadcast on this if. */ 660 np->n_flags &= ~IFF_MULTICAST; 661 #else 662 free((char *)np); 663 continue; 664 #endif 665 } 666 } 667 np->n_next = neighbors; 668 neighbors = np; 669 } 670 free(buf); 671 return (1); 672 } 673 674 #ifdef DEBUG 675 void 676 Sendto(s, buf, cc, flags, to, tolen) 677 int s; 678 const void *buf; 679 size_t cc; 680 int flags; 681 const struct sockaddr *to; 682 int tolen; 683 { 684 register struct whod *w = (struct whod *)buf; 685 register struct whoent *we; 686 struct sockaddr_in *sin = (struct sockaddr_in *)to; 687 688 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 689 ntohs(sin->sin_port)); 690 printf("hostname %s %s\n", w->wd_hostname, 691 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 692 printf("load %4.2f, %4.2f, %4.2f\n", 693 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 694 ntohl(w->wd_loadav[2]) / 100.0); 695 cc -= WHDRSIZE; 696 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 697 time_t t = ntohl(we->we_utmp.out_time); 698 printf("%-8.8s %s:%s %.12s", 699 we->we_utmp.out_name, 700 w->wd_hostname, we->we_utmp.out_line, 701 ctime(&t)+4); 702 we->we_idle = ntohl(we->we_idle) / 60; 703 if (we->we_idle) { 704 if (we->we_idle >= 100*60) 705 we->we_idle = 100*60 - 1; 706 if (we->we_idle >= 60) 707 printf(" %2d", we->we_idle / 60); 708 else 709 printf(" "); 710 printf(":%02d", we->we_idle % 60); 711 } 712 printf("\n"); 713 } 714 } 715 716 char * 717 interval(time, updown) 718 int time; 719 char *updown; 720 { 721 static char resbuf[32]; 722 int days, hours, minutes; 723 724 if (time < 0 || time > 3*30*24*60*60) { 725 (void) sprintf(resbuf, " %s ??:??", updown); 726 return (resbuf); 727 } 728 minutes = (time + 59) / 60; /* round to minutes */ 729 hours = minutes / 60; minutes %= 60; 730 days = hours / 24; hours %= 24; 731 if (days) 732 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 733 updown, days, hours, minutes); 734 else 735 (void) sprintf(resbuf, "%s %2d:%02d", 736 updown, hours, minutes); 737 return (resbuf); 738 } 739 #endif 740