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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #if 0 37 #ifndef lint 38 static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; 39 #endif /* not lint */ 40 #endif 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/socket.h> 47 #include <sys/stat.h> 48 #include <sys/signal.h> 49 #include <sys/ioctl.h> 50 #include <sys/sysctl.h> 51 52 #include <net/if.h> 53 #include <net/if_dl.h> 54 #include <net/route.h> 55 #include <netinet/in.h> 56 #include <arpa/inet.h> 57 #include <protocols/rwhod.h> 58 59 #include <ctype.h> 60 #include <err.h> 61 #include <errno.h> 62 #include <fcntl.h> 63 #include <netdb.h> 64 #include <paths.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <syslog.h> 69 #include <timeconv.h> 70 #include <unistd.h> 71 #include <utmp.h> 72 #include <pwd.h> 73 #include <grp.h> 74 75 /* 76 * This version of Berkeley's rwhod has been modified to use IP multicast 77 * datagrams, under control of a new command-line option: 78 * 79 * rwhod -m causes rwhod to use IP multicast (instead of 80 * broadcast or unicast) on all interfaces that have 81 * the IFF_MULTICAST flag set in their "ifnet" structs 82 * (excluding the loopback interface). The multicast 83 * reports are sent with a time-to-live of 1, to prevent 84 * forwarding beyond the directly-connected subnet(s). 85 * 86 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 87 * time-to-live of <ttl>, via a SINGLE interface rather 88 * than all interfaces. <ttl> must be between 0 and 89 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 90 * is different than "-m", in that "-m 1" specifies 91 * transmission on one interface only. 92 * 93 * When "-m" is used without a <ttl> argument, the program accepts multicast 94 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 95 * is given, it accepts multicast reports from only one interface, the one 96 * on which reports are sent (which may be controlled via the host's routing 97 * table). Regardless of the "-m" option, the program accepts broadcast or 98 * unicast reports from all interfaces. Thus, this program will hear the 99 * reports of old, non-multicasting rwhods, but, if multicasting is used, 100 * those old rwhods won't hear the reports generated by this program. 101 * 102 * -- Steve Deering, Stanford University, February 1989 103 */ 104 105 #define UNPRIV_USER "daemon" 106 #define UNPRIV_GROUP "daemon" 107 108 #define NO_MULTICAST 0 /* multicast modes */ 109 #define PER_INTERFACE_MULTICAST 1 110 #define SCOPED_MULTICAST 2 111 112 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 113 114 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 115 /* (belongs in protocols/rwhod.h) */ 116 117 int insecure_mode; 118 int quiet_mode; 119 int iff_flag = IFF_POINTOPOINT; 120 int multicast_mode = NO_MULTICAST; 121 int multicast_scope; 122 struct sockaddr_in multicast_addr = 123 { sizeof multicast_addr, AF_INET, 0, { 0 }, { 0 } }; 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 (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 152 153 void run_as(uid_t *, gid_t *); 154 int configure(int); 155 void getboottime(int); 156 void onalrm(int); 157 void quit(const char *); 158 void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 159 int verify(char *, int); 160 static void usage(void); 161 #ifdef DEBUG 162 char *interval(int, char *); 163 void Sendto(int, const void *, size_t, int, const struct sockaddr *, int); 164 #define sendto Sendto 165 #endif 166 167 int 168 main(int argc, char *argv[]) 169 { 170 struct sockaddr_in from; 171 struct stat st; 172 char path[64]; 173 int on = 1; 174 char *cp; 175 struct sockaddr_in soin; 176 uid_t unpriv_uid; 177 gid_t unpriv_gid; 178 179 if (getuid()) 180 errx(1, "not super user"); 181 182 run_as(&unpriv_uid, &unpriv_gid); 183 184 argv++; argc--; 185 while (argc > 0 && *argv[0] == '-') { 186 if (strcmp(*argv, "-m") == 0) { 187 if (argc > 1 && isdigit(*(argv + 1)[0])) { 188 argv++, argc--; 189 multicast_mode = SCOPED_MULTICAST; 190 multicast_scope = atoi(*argv); 191 if (multicast_scope > MAX_MULTICAST_SCOPE) 192 errx(1, "ttl must not exceed %u", 193 MAX_MULTICAST_SCOPE); 194 } 195 else multicast_mode = PER_INTERFACE_MULTICAST; 196 } 197 else if (strcmp(*argv, "-i") == 0) 198 insecure_mode = 1; 199 else if (strcmp(*argv, "-l") == 0) 200 quiet_mode = 1; 201 else if (strcmp(*argv, "-p") == 0) 202 iff_flag = 0; 203 else 204 usage(); 205 argv++, argc--; 206 } 207 if (argc > 0) 208 usage(); 209 #ifndef DEBUG 210 daemon(1, 0); 211 #endif 212 (void) signal(SIGHUP, getboottime); 213 openlog("rwhod", LOG_PID, LOG_DAEMON); 214 sp = getservbyname("who", "udp"); 215 if (sp == NULL) { 216 syslog(LOG_ERR, "who/udp: unknown service"); 217 exit(1); 218 } 219 if (chdir(_PATH_RWHODIR) < 0) { 220 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 221 exit(1); 222 } 223 /* 224 * Establish host name as returned by system. 225 */ 226 if (gethostname(myname, sizeof(myname) - 1) < 0) { 227 syslog(LOG_ERR, "gethostname: %m"); 228 exit(1); 229 } 230 if ((cp = index(myname, '.')) != NULL) 231 *cp = '\0'; 232 strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1); 233 mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0'; 234 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 235 if (utmpf < 0) { 236 syslog(LOG_ERR, "%s: %m", _PATH_UTMP); 237 exit(1); 238 } 239 getboottime(0); 240 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 241 syslog(LOG_ERR, "socket: %m"); 242 exit(1); 243 } 244 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 245 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 246 exit(1); 247 } 248 memset(&soin, 0, sizeof(soin)); 249 soin.sin_len = sizeof(soin); 250 soin.sin_family = AF_INET; 251 soin.sin_port = sp->s_port; 252 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) { 253 syslog(LOG_ERR, "bind: %m"); 254 exit(1); 255 } 256 setgid(unpriv_gid); 257 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 258 setuid(unpriv_uid); 259 if (!configure(s)) 260 exit(1); 261 if (!quiet_mode) { 262 signal(SIGALRM, onalrm); 263 onalrm(0); 264 } 265 for (;;) { 266 struct whod wd; 267 int cc, whod, len = sizeof(from); 268 time_t t; 269 270 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 271 (struct sockaddr *)&from, &len); 272 if (cc <= 0) { 273 if (cc < 0 && errno != EINTR) 274 syslog(LOG_WARNING, "recv: %m"); 275 continue; 276 } 277 if (from.sin_port != sp->s_port && !insecure_mode) { 278 syslog(LOG_WARNING, "%d: bad source port from %s", 279 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 280 continue; 281 } 282 if (cc < WHDRSIZE) { 283 syslog(LOG_WARNING, "short packet from %s", 284 inet_ntoa(from.sin_addr)); 285 continue; 286 } 287 if (wd.wd_vers != WHODVERSION) 288 continue; 289 if (wd.wd_type != WHODTYPE_STATUS) 290 continue; 291 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 292 syslog(LOG_WARNING, "malformed host name from %s", 293 inet_ntoa(from.sin_addr)); 294 continue; 295 } 296 (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 297 /* 298 * Rather than truncating and growing the file each time, 299 * use ftruncate if size is less than previous size. 300 */ 301 whod = open(path, O_WRONLY | O_CREAT, 0644); 302 if (whod < 0) { 303 syslog(LOG_WARNING, "%s: %m", path); 304 continue; 305 } 306 #if ENDIAN != BIG_ENDIAN 307 { 308 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 309 struct whoent *we; 310 311 /* undo header byte swapping before writing to file */ 312 wd.wd_sendtime = ntohl(wd.wd_sendtime); 313 for (i = 0; i < 3; i++) 314 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 315 wd.wd_boottime = ntohl(wd.wd_boottime); 316 we = wd.wd_we; 317 for (i = 0; i < n; i++) { 318 we->we_idle = ntohl(we->we_idle); 319 we->we_utmp.out_time = 320 ntohl(we->we_utmp.out_time); 321 we++; 322 } 323 } 324 #endif 325 (void) time(&t); 326 wd.wd_recvtime = _time_to_int(t); 327 (void) write(whod, (char *)&wd, cc); 328 if (fstat(whod, &st) < 0 || st.st_size > cc) 329 ftruncate(whod, cc); 330 (void) close(whod); 331 } 332 } 333 334 static void 335 usage() 336 { 337 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 338 exit(1); 339 } 340 341 void 342 run_as(uid, gid) 343 uid_t *uid; 344 gid_t *gid; 345 { 346 struct passwd *pw; 347 struct group *gr; 348 349 pw = getpwnam(UNPRIV_USER); 350 if (!pw) { 351 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 352 exit(1); 353 } 354 *uid = pw->pw_uid; 355 356 gr = getgrnam(UNPRIV_GROUP); 357 if (!gr) { 358 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 359 exit(1); 360 } 361 *gid = gr->gr_gid; 362 } 363 364 /* 365 * Check out host name for unprintables 366 * and other funnies before allowing a file 367 * to be created. Sorry, but blanks aren't allowed. 368 */ 369 int 370 verify(name, maxlen) 371 register char *name; 372 register int maxlen; 373 { 374 register int size = 0; 375 376 while (*name && size < maxlen - 1) { 377 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 378 return (0); 379 name++, size++; 380 } 381 *name = '\0'; 382 return (size > 0); 383 } 384 385 int utmptime; 386 int utmpent; 387 int utmpsize = 0; 388 struct utmp *utmp; 389 int alarmcount; 390 391 void 392 onalrm(signo) 393 int signo __unused; 394 { 395 register struct neighbor *np; 396 register struct whoent *we = mywd.wd_we, *wlast; 397 register int i; 398 struct stat stb; 399 double avenrun[3]; 400 time_t now; 401 int cc; 402 403 now = time(NULL); 404 if (alarmcount % 10 == 0) 405 getboottime(0); 406 alarmcount++; 407 (void) fstat(utmpf, &stb); 408 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 409 utmptime = stb.st_mtime; 410 if (stb.st_size > utmpsize) { 411 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 412 if (utmp) 413 utmp = (struct utmp *)realloc(utmp, utmpsize); 414 else 415 utmp = (struct utmp *)malloc(utmpsize); 416 if (! utmp) { 417 syslog(LOG_WARNING, "malloc failed"); 418 utmpsize = 0; 419 goto done; 420 } 421 } 422 (void) lseek(utmpf, (off_t)0, L_SET); 423 cc = read(utmpf, (char *)utmp, stb.st_size); 424 if (cc < 0) { 425 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 426 goto done; 427 } 428 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 429 utmpent = cc / sizeof(struct utmp); 430 for (i = 0; i < utmpent; i++) 431 if (utmp[i].ut_name[0]) { 432 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 433 sizeof(utmp[i].ut_line)); 434 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 435 sizeof(utmp[i].ut_name)); 436 we->we_utmp.out_time = htonl(utmp[i].ut_time); 437 if (we >= wlast) 438 break; 439 we++; 440 } 441 utmpent = we - mywd.wd_we; 442 } 443 444 /* 445 * The test on utmpent looks silly---after all, if no one is 446 * logged on, why worry about efficiency?---but is useful on 447 * (e.g.) compute servers. 448 */ 449 if (utmpent && chdir(_PATH_DEV)) { 450 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 451 exit(1); 452 } 453 we = mywd.wd_we; 454 for (i = 0; i < utmpent; i++) { 455 if (stat(we->we_utmp.out_line, &stb) >= 0) 456 we->we_idle = htonl(now - stb.st_atime); 457 we++; 458 } 459 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 460 for (i = 0; i < 3; i++) 461 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 462 cc = (char *)we - (char *)&mywd; 463 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 464 mywd.wd_vers = WHODVERSION; 465 mywd.wd_type = WHODTYPE_STATUS; 466 if (multicast_mode == SCOPED_MULTICAST) { 467 (void) sendto(s, (char *)&mywd, cc, 0, 468 (struct sockaddr *)&multicast_addr, 469 sizeof(multicast_addr)); 470 } 471 else for (np = neighbors; np != NULL; np = np->n_next) { 472 if (multicast_mode == PER_INTERFACE_MULTICAST && 473 np->n_flags & IFF_MULTICAST) { 474 /* 475 * Select the outgoing interface for the multicast. 476 */ 477 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 478 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 479 sizeof(struct in_addr)) < 0) { 480 syslog(LOG_ERR, 481 "setsockopt IP_MULTICAST_IF: %m"); 482 exit(1); 483 } 484 (void) sendto(s, (char *)&mywd, cc, 0, 485 (struct sockaddr *)&multicast_addr, 486 sizeof(multicast_addr)); 487 } else (void) sendto(s, (char *)&mywd, cc, 0, 488 np->n_addr, np->n_addrlen); 489 } 490 if (utmpent && chdir(_PATH_RWHODIR)) { 491 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 492 exit(1); 493 } 494 done: 495 (void) alarm(AL_INTERVAL); 496 } 497 498 void 499 getboottime(signo) 500 int signo __unused; 501 { 502 int mib[2]; 503 size_t size; 504 struct timeval tm; 505 506 mib[0] = CTL_KERN; 507 mib[1] = KERN_BOOTTIME; 508 size = sizeof(tm); 509 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 510 syslog(LOG_ERR, "cannot get boottime: %m"); 511 exit(1); 512 } 513 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 514 } 515 516 void 517 quit(msg) 518 const char *msg; 519 { 520 syslog(LOG_ERR, "%s", msg); 521 exit(1); 522 } 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 cp += SA_SIZE(sa); 538 } 539 } 540 541 /* 542 * Figure out device configuration and select 543 * networks which deserve status information. 544 */ 545 int 546 configure(so) 547 int so; 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(so, 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(so, 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 = _time32_to_time(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