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 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)rwhod.c 8.1 (Berkeley) 6/6/93 35 * $FreeBSD: src/usr.sbin/rwhod/rwhod.c,v 1.13.2.2 2000/12/23 15:28:12 iedowse Exp $ 36 * $DragonFly: src/usr.sbin/rwhod/rwhod.c,v 1.4 2004/03/13 21:07:24 eirikn Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/socket.h> 41 #include <sys/stat.h> 42 #include <sys/signal.h> 43 #include <sys/ioctl.h> 44 #include <sys/sysctl.h> 45 46 #include <net/if.h> 47 #include <net/if_dl.h> 48 #include <net/route.h> 49 #include <netinet/in.h> 50 #include <arpa/inet.h> 51 #include <protocols/rwhod.h> 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <errno.h> 56 #include <fcntl.h> 57 #include <netdb.h> 58 #include <paths.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <syslog.h> 63 #include <unistd.h> 64 #include <utmp.h> 65 #include <pwd.h> 66 #include <grp.h> 67 68 /* 69 * This version of Berkeley's rwhod has been modified to use IP multicast 70 * datagrams, under control of a new command-line option: 71 * 72 * rwhod -m causes rwhod to use IP multicast (instead of 73 * broadcast or unicast) on all interfaces that have 74 * the IFF_MULTICAST flag set in their "ifnet" structs 75 * (excluding the loopback interface). The multicast 76 * reports are sent with a time-to-live of 1, to prevent 77 * forwarding beyond the directly-connected subnet(s). 78 * 79 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 80 * time-to-live of <ttl>, via a SINGLE interface rather 81 * than all interfaces. <ttl> must be between 0 and 82 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 83 * is different than "-m", in that "-m 1" specifies 84 * transmission on one interface only. 85 * 86 * When "-m" is used without a <ttl> argument, the program accepts multicast 87 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 88 * is given, it accepts multicast reports from only one interface, the one 89 * on which reports are sent (which may be controlled via the host's routing 90 * table). Regardless of the "-m" option, the program accepts broadcast or 91 * unicast reports from all interfaces. Thus, this program will hear the 92 * reports of old, non-multicasting rwhods, but, if multicasting is used, 93 * those old rwhods won't hear the reports generated by this program. 94 * 95 * -- Steve Deering, Stanford University, February 1989 96 */ 97 98 #define UNPRIV_USER "daemon" 99 #define UNPRIV_GROUP "daemon" 100 101 #define NO_MULTICAST 0 /* multicast modes */ 102 #define PER_INTERFACE_MULTICAST 1 103 #define SCOPED_MULTICAST 2 104 105 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 106 107 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 108 /* (belongs in protocols/rwhod.h) */ 109 110 int insecure_mode; 111 int quiet_mode; 112 int iff_flag = IFF_POINTOPOINT; 113 int multicast_mode = NO_MULTICAST; 114 int multicast_scope; 115 struct sockaddr_in multicast_addr = { sizeof multicast_addr, AF_INET }; 116 117 /* 118 * Alarm interval. Don't forget to change the down time check in ruptime 119 * if this is changed. 120 */ 121 #define AL_INTERVAL (3 * 60) 122 123 char myname[MAXHOSTNAMELEN]; 124 125 /* 126 * We communicate with each neighbor in a list constructed at the time we're 127 * started up. Neighbors are currently directly connected via a hardware 128 * interface. 129 */ 130 struct neighbor { 131 struct neighbor *n_next; 132 char *n_name; /* interface name */ 133 struct sockaddr *n_addr; /* who to send to */ 134 int n_addrlen; /* size of address */ 135 int n_flags; /* should forward?, interface flags */ 136 }; 137 138 struct neighbor *neighbors; 139 struct whod mywd; 140 struct servent *sp; 141 int s, utmpf; 142 143 #define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we)) 144 145 void run_as(uid_t *, gid_t *); 146 int configure(int); 147 void getboottime(int); 148 void onalrm(int); 149 void quit(char *); 150 void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 151 int verify(char *, int); 152 static void usage(void); 153 #ifdef DEBUG 154 char *interval(int, char *); 155 void Sendto(int, const void *, size_t, int, 156 const struct sockaddr *, int); 157 #define sendto Sendto 158 #endif 159 160 int 161 main(int argc, char *argv[]) 162 { 163 struct sockaddr_in from; 164 struct stat st; 165 char path[64]; 166 int on = 1; 167 char *cp; 168 struct sockaddr_in sin; 169 uid_t unpriv_uid; 170 gid_t unpriv_gid; 171 172 if (getuid()) 173 errx(1, "not super user"); 174 175 run_as(&unpriv_uid, &unpriv_gid); 176 177 argv++; argc--; 178 while (argc > 0 && *argv[0] == '-') { 179 if (strcmp(*argv, "-m") == 0) { 180 if (argc > 1 && isdigit(*(argv + 1)[0])) { 181 argv++, argc--; 182 multicast_mode = SCOPED_MULTICAST; 183 multicast_scope = atoi(*argv); 184 if (multicast_scope > MAX_MULTICAST_SCOPE) 185 errx(1, "ttl must not exceed %u", 186 MAX_MULTICAST_SCOPE); 187 } 188 else multicast_mode = PER_INTERFACE_MULTICAST; 189 } 190 else if (strcmp(*argv, "-i") == 0) 191 insecure_mode = 1; 192 else if (strcmp(*argv, "-l") == 0) 193 quiet_mode = 1; 194 else if (strcmp(*argv, "-p") == 0) 195 iff_flag = 0; 196 else 197 usage(); 198 argv++, argc--; 199 } 200 if (argc > 0) 201 usage(); 202 #ifndef DEBUG 203 daemon(1, 0); 204 #endif 205 (void) signal(SIGHUP, getboottime); 206 openlog("rwhod", LOG_PID, LOG_DAEMON); 207 sp = getservbyname("who", "udp"); 208 if (sp == NULL) { 209 syslog(LOG_ERR, "udp/who: unknown service"); 210 exit(1); 211 } 212 if (chdir(_PATH_RWHODIR) < 0) { 213 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 214 exit(1); 215 } 216 /* 217 * Establish host name as returned by system. 218 */ 219 if (gethostname(myname, sizeof(myname) - 1) < 0) { 220 syslog(LOG_ERR, "gethostname: %m"); 221 exit(1); 222 } 223 if ((cp = index(myname, '.')) != NULL) 224 *cp = '\0'; 225 strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1); 226 mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0'; 227 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 228 if (utmpf < 0) { 229 syslog(LOG_ERR, "%s: %m", _PATH_UTMP); 230 exit(1); 231 } 232 getboottime(0); 233 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 234 syslog(LOG_ERR, "socket: %m"); 235 exit(1); 236 } 237 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 238 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 239 exit(1); 240 } 241 memset(&sin, 0, sizeof(sin)); 242 sin.sin_len = sizeof(sin); 243 sin.sin_family = AF_INET; 244 sin.sin_port = sp->s_port; 245 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 246 syslog(LOG_ERR, "bind: %m"); 247 exit(1); 248 } 249 setgid(unpriv_gid); 250 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 251 setuid(unpriv_uid); 252 if (!configure(s)) 253 exit(1); 254 if (!quiet_mode) { 255 signal(SIGALRM, onalrm); 256 onalrm(0); 257 } 258 for (;;) { 259 struct whod wd; 260 int cc, whod, len = sizeof(from); 261 262 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 263 (struct sockaddr *)&from, &len); 264 if (cc <= 0) { 265 if (cc < 0 && errno != EINTR) 266 syslog(LOG_WARNING, "recv: %m"); 267 continue; 268 } 269 if (from.sin_port != sp->s_port && !insecure_mode) { 270 syslog(LOG_WARNING, "%d: bad source port from %s", 271 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 272 continue; 273 } 274 if (cc < WHDRSIZE) { 275 syslog(LOG_WARNING, "short packet from %s", 276 inet_ntoa(from.sin_addr)); 277 continue; 278 } 279 if (wd.wd_vers != WHODVERSION) 280 continue; 281 if (wd.wd_type != WHODTYPE_STATUS) 282 continue; 283 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 284 syslog(LOG_WARNING, "malformed host name from %s", 285 inet_ntoa(from.sin_addr)); 286 continue; 287 } 288 (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 289 /* 290 * Rather than truncating and growing the file each time, 291 * use ftruncate if size is less than previous size. 292 */ 293 whod = open(path, O_WRONLY | O_CREAT, 0644); 294 if (whod < 0) { 295 syslog(LOG_WARNING, "%s: %m", path); 296 continue; 297 } 298 #if ENDIAN != BIG_ENDIAN 299 { 300 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 301 struct whoent *we; 302 303 /* undo header byte swapping before writing to file */ 304 wd.wd_sendtime = ntohl(wd.wd_sendtime); 305 for (i = 0; i < 3; i++) 306 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 307 wd.wd_boottime = ntohl(wd.wd_boottime); 308 we = wd.wd_we; 309 for (i = 0; i < n; i++) { 310 we->we_idle = ntohl(we->we_idle); 311 we->we_utmp.out_time = 312 ntohl(we->we_utmp.out_time); 313 we++; 314 } 315 } 316 #endif 317 (void) time((time_t *)&wd.wd_recvtime); 318 (void) write(whod, (char *)&wd, cc); 319 if (fstat(whod, &st) < 0 || st.st_size > cc) 320 ftruncate(whod, cc); 321 (void) close(whod); 322 } 323 } 324 325 static void 326 usage(void) 327 { 328 329 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 330 exit(1); 331 } 332 333 void 334 run_as(uid_t *uid, gid_t *gid) 335 { 336 struct passwd *pw; 337 struct group *gr; 338 339 pw = getpwnam(UNPRIV_USER); 340 if (!pw) { 341 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 342 exit(1); 343 } 344 *uid = pw->pw_uid; 345 346 gr = getgrnam(UNPRIV_GROUP); 347 if (!gr) { 348 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 349 exit(1); 350 } 351 *gid = gr->gr_gid; 352 } 353 354 /* 355 * Check out host name for unprintables 356 * and other funnies before allowing a file 357 * to be created. Sorry, but blanks aren't allowed. 358 */ 359 int 360 verify(char *name, int maxlen) 361 { 362 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(int signo) 381 { 382 struct neighbor *np; 383 struct whoent *we = mywd.wd_we, *wlast; 384 int i; 385 struct stat stb; 386 double avenrun[3]; 387 time_t now; 388 int cc; 389 390 now = time(NULL); 391 if (alarmcount % 10 == 0) 392 getboottime(0); 393 alarmcount++; 394 (void) fstat(utmpf, &stb); 395 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 396 utmptime = stb.st_mtime; 397 if (stb.st_size > utmpsize) { 398 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 399 if (utmp) 400 utmp = (struct utmp *)realloc(utmp, utmpsize); 401 else 402 utmp = (struct utmp *)malloc(utmpsize); 403 if (! utmp) { 404 syslog(LOG_WARNING, "malloc failed"); 405 utmpsize = 0; 406 goto done; 407 } 408 } 409 (void) lseek(utmpf, (off_t)0, L_SET); 410 cc = read(utmpf, (char *)utmp, stb.st_size); 411 if (cc < 0) { 412 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 413 goto done; 414 } 415 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 416 utmpent = cc / sizeof(struct utmp); 417 for (i = 0; i < utmpent; i++) 418 if (utmp[i].ut_name[0]) { 419 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 420 sizeof(utmp[i].ut_line)); 421 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 422 sizeof(utmp[i].ut_name)); 423 we->we_utmp.out_time = htonl(utmp[i].ut_time); 424 if (we >= wlast) 425 break; 426 we++; 427 } 428 utmpent = we - mywd.wd_we; 429 } 430 431 /* 432 * The test on utmpent looks silly---after all, if no one is 433 * logged on, why worry about efficiency?---but is useful on 434 * (e.g.) compute servers. 435 */ 436 if (utmpent && chdir(_PATH_DEV)) { 437 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 438 exit(1); 439 } 440 we = mywd.wd_we; 441 for (i = 0; i < utmpent; i++) { 442 if (stat(we->we_utmp.out_line, &stb) >= 0) 443 we->we_idle = htonl(now - stb.st_atime); 444 we++; 445 } 446 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 447 for (i = 0; i < 3; i++) 448 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 449 cc = (char *)we - (char *)&mywd; 450 mywd.wd_sendtime = htonl(time(0)); 451 mywd.wd_vers = WHODVERSION; 452 mywd.wd_type = WHODTYPE_STATUS; 453 if (multicast_mode == SCOPED_MULTICAST) { 454 (void) sendto(s, (char *)&mywd, cc, 0, 455 (struct sockaddr *)&multicast_addr, 456 sizeof(multicast_addr)); 457 } 458 else for (np = neighbors; np != NULL; np = np->n_next) { 459 if (multicast_mode == PER_INTERFACE_MULTICAST && 460 np->n_flags & IFF_MULTICAST) { 461 /* 462 * Select the outgoing interface for the multicast. 463 */ 464 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 465 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 466 sizeof(struct in_addr)) < 0) { 467 syslog(LOG_ERR, 468 "setsockopt IP_MULTICAST_IF: %m"); 469 exit(1); 470 } 471 (void) sendto(s, (char *)&mywd, cc, 0, 472 (struct sockaddr *)&multicast_addr, 473 sizeof(multicast_addr)); 474 } else (void) sendto(s, (char *)&mywd, cc, 0, 475 np->n_addr, np->n_addrlen); 476 } 477 if (utmpent && chdir(_PATH_RWHODIR)) { 478 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 479 exit(1); 480 } 481 done: 482 (void) alarm(AL_INTERVAL); 483 } 484 485 void 486 getboottime(int signo) 487 { 488 int mib[2]; 489 size_t size; 490 struct timeval tm; 491 492 mib[0] = CTL_KERN; 493 mib[1] = KERN_BOOTTIME; 494 size = sizeof(tm); 495 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 496 syslog(LOG_ERR, "cannot get boottime: %m"); 497 exit(1); 498 } 499 mywd.wd_boottime = htonl(tm.tv_sec); 500 } 501 502 void 503 quit(char *msg) 504 { 505 506 syslog(LOG_ERR, "%s", msg); 507 exit(1); 508 } 509 510 #define ROUNDUP(a) \ 511 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 512 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 513 514 void 515 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 516 { 517 struct sockaddr *sa; 518 int i; 519 520 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 521 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 522 if ((rtinfo->rti_addrs & (1 << i)) == 0) 523 continue; 524 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 525 ADVANCE(cp, sa); 526 } 527 } 528 529 /* 530 * Figure out device configuration and select 531 * networks which deserve status information. 532 */ 533 int 534 configure(int s) 535 { 536 struct neighbor *np; 537 struct if_msghdr *ifm; 538 struct ifa_msghdr *ifam; 539 struct sockaddr_dl *sdl; 540 size_t needed; 541 int mib[6], flags = 0, len; 542 char *buf, *lim, *next; 543 struct rt_addrinfo info; 544 545 if (multicast_mode != NO_MULTICAST) { 546 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 547 multicast_addr.sin_port = sp->s_port; 548 } 549 550 if (multicast_mode == SCOPED_MULTICAST) { 551 struct ip_mreq mreq; 552 unsigned char ttl; 553 554 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 555 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 556 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 557 &mreq, sizeof(mreq)) < 0) { 558 syslog(LOG_ERR, 559 "setsockopt IP_ADD_MEMBERSHIP: %m"); 560 return(0); 561 } 562 ttl = multicast_scope; 563 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 564 &ttl, sizeof(ttl)) < 0) { 565 syslog(LOG_ERR, 566 "setsockopt IP_MULTICAST_TTL: %m"); 567 return(0); 568 } 569 return(1); 570 } 571 572 mib[0] = CTL_NET; 573 mib[1] = PF_ROUTE; 574 mib[2] = 0; 575 mib[3] = AF_INET; 576 mib[4] = NET_RT_IFLIST; 577 mib[5] = 0; 578 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 579 quit("route-sysctl-estimate"); 580 if ((buf = malloc(needed)) == NULL) 581 quit("malloc"); 582 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 583 quit("actual retrieval of interface table"); 584 lim = buf + needed; 585 586 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 587 for (next = buf; next < lim; next += ifm->ifm_msglen) { 588 ifm = (struct if_msghdr *)next; 589 if (ifm->ifm_type == RTM_IFINFO) { 590 sdl = (struct sockaddr_dl *)(ifm + 1); 591 flags = ifm->ifm_flags; 592 continue; 593 } 594 if ((flags & IFF_UP) == 0 || 595 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 596 IFF_MULTICAST : 0) | 597 IFF_BROADCAST|iff_flag)) == 0) 598 continue; 599 if (ifm->ifm_type != RTM_NEWADDR) 600 quit("out of sync parsing NET_RT_IFLIST"); 601 ifam = (struct ifa_msghdr *)ifm; 602 info.rti_addrs = ifam->ifam_addrs; 603 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 604 &info); 605 /* gag, wish we could get rid of Internet dependencies */ 606 #define dstaddr info.rti_info[RTAX_BRD] 607 #define ifaddr info.rti_info[RTAX_IFA] 608 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 609 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 610 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 611 continue; 612 PORT_SA(dstaddr) = sp->s_port; 613 for (np = neighbors; np != NULL; np = np->n_next) 614 if (memcmp(sdl->sdl_data, np->n_name, 615 sdl->sdl_nlen) == 0 && 616 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 617 break; 618 if (np != NULL) 619 continue; 620 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 621 np = (struct neighbor *)malloc(len); 622 if (np == NULL) 623 quit("malloc of neighbor structure"); 624 memset(np, 0, len); 625 np->n_flags = flags; 626 np->n_addr = (struct sockaddr *)(np + 1); 627 np->n_addrlen = dstaddr->sa_len; 628 np->n_name = np->n_addrlen + (char *)np->n_addr; 629 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 630 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 631 if (multicast_mode == PER_INTERFACE_MULTICAST && 632 (flags & IFF_MULTICAST) && 633 !(flags & IFF_LOOPBACK)) { 634 struct ip_mreq mreq; 635 636 memcpy((char *)np->n_addr, (char *)ifaddr, 637 np->n_addrlen); 638 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 639 mreq.imr_interface.s_addr = 640 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 641 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 642 &mreq, sizeof(mreq)) < 0) { 643 syslog(LOG_ERR, 644 "setsockopt IP_ADD_MEMBERSHIP: %m"); 645 #if 0 646 /* Fall back to broadcast on this if. */ 647 np->n_flags &= ~IFF_MULTICAST; 648 #else 649 free((char *)np); 650 continue; 651 #endif 652 } 653 } 654 np->n_next = neighbors; 655 neighbors = np; 656 } 657 free(buf); 658 return (1); 659 } 660 661 #ifdef DEBUG 662 void 663 Sendto(int s, const void *buf, size_t cc, int flags, 664 const struct sockaddr *to, int tolen) 665 { 666 struct whod *w = (struct whod *)buf; 667 struct whoent *we; 668 struct sockaddr_in *sin = (struct sockaddr_in *)to; 669 670 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 671 ntohs(sin->sin_port)); 672 printf("hostname %s %s\n", w->wd_hostname, 673 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 674 printf("load %4.2f, %4.2f, %4.2f\n", 675 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 676 ntohl(w->wd_loadav[2]) / 100.0); 677 cc -= WHDRSIZE; 678 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 679 time_t t = ntohl(we->we_utmp.out_time); 680 printf("%-8.8s %s:%s %.12s", 681 we->we_utmp.out_name, 682 w->wd_hostname, we->we_utmp.out_line, 683 ctime(&t)+4); 684 we->we_idle = ntohl(we->we_idle) / 60; 685 if (we->we_idle) { 686 if (we->we_idle >= 100*60) 687 we->we_idle = 100*60 - 1; 688 if (we->we_idle >= 60) 689 printf(" %2d", we->we_idle / 60); 690 else 691 printf(" "); 692 printf(":%02d", we->we_idle % 60); 693 } 694 printf("\n"); 695 } 696 } 697 698 char * 699 interval(int time, char *updown) 700 { 701 static char resbuf[32]; 702 int days, hours, minutes; 703 704 if (time < 0 || time > 3*30*24*60*60) { 705 (void) sprintf(resbuf, " %s ??:??", updown); 706 return (resbuf); 707 } 708 minutes = (time + 59) / 60; /* round to minutes */ 709 hours = minutes / 60; minutes %= 60; 710 days = hours / 24; hours %= 24; 711 if (days) 712 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 713 updown, days, hours, minutes); 714 else 715 (void) sprintf(resbuf, "%s %2d:%02d", 716 updown, hours, minutes); 717 return (resbuf); 718 } 719 #endif 720