rwhod.c revision 70284
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 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 42static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; 43#endif 44static const char rcsid[] = 45 "$FreeBSD: head/usr.sbin/rwhod/rwhod.c 70284 2000-12-22 21:30:15Z iedowse $"; 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 <arpa/inet.h> 60#include <protocols/rwhod.h> 61 62#include <ctype.h> 63#include <err.h> 64#include <errno.h> 65#include <fcntl.h> 66#include <netdb.h> 67#include <paths.h> 68#include <stdio.h> 69#include <stdlib.h> 70#include <string.h> 71#include <syslog.h> 72#include <unistd.h> 73#include <utmp.h> 74#include <pwd.h> 75#include <grp.h> 76 77/* 78 * This version of Berkeley's rwhod has been modified to use IP multicast 79 * datagrams, under control of a new command-line option: 80 * 81 * rwhod -m causes rwhod to use IP multicast (instead of 82 * broadcast or unicast) on all interfaces that have 83 * the IFF_MULTICAST flag set in their "ifnet" structs 84 * (excluding the loopback interface). The multicast 85 * reports are sent with a time-to-live of 1, to prevent 86 * forwarding beyond the directly-connected subnet(s). 87 * 88 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 89 * time-to-live of <ttl>, via a SINGLE interface rather 90 * than all interfaces. <ttl> must be between 0 and 91 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 92 * is different than "-m", in that "-m 1" specifies 93 * transmission on one interface only. 94 * 95 * When "-m" is used without a <ttl> argument, the program accepts multicast 96 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 97 * is given, it accepts multicast reports from only one interface, the one 98 * on which reports are sent (which may be controlled via the host's routing 99 * table). Regardless of the "-m" option, the program accepts broadcast or 100 * unicast reports from all interfaces. Thus, this program will hear the 101 * reports of old, non-multicasting rwhods, but, if multicasting is used, 102 * those old rwhods won't hear the reports generated by this program. 103 * 104 * -- Steve Deering, Stanford University, February 1989 105 */ 106 107#define UNPRIV_USER "daemon" 108#define UNPRIV_GROUP "daemon" 109 110#define NO_MULTICAST 0 /* multicast modes */ 111#define PER_INTERFACE_MULTICAST 1 112#define SCOPED_MULTICAST 2 113 114#define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 115 116#define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 117 /* (belongs in protocols/rwhod.h) */ 118 119int insecure_mode; 120int quiet_mode; 121int iff_flag = IFF_POINTOPOINT; 122int multicast_mode = NO_MULTICAST; 123int multicast_scope; 124struct sockaddr_in multicast_addr = { sizeof multicast_addr, AF_INET }; 125 126/* 127 * Alarm interval. Don't forget to change the down time check in ruptime 128 * if this is changed. 129 */ 130#define AL_INTERVAL (3 * 60) 131 132char myname[MAXHOSTNAMELEN]; 133 134/* 135 * We communicate with each neighbor in a list constructed at the time we're 136 * started up. Neighbors are currently directly connected via a hardware 137 * interface. 138 */ 139struct neighbor { 140 struct neighbor *n_next; 141 char *n_name; /* interface name */ 142 struct sockaddr *n_addr; /* who to send to */ 143 int n_addrlen; /* size of address */ 144 int n_flags; /* should forward?, interface flags */ 145}; 146 147struct neighbor *neighbors; 148struct whod mywd; 149struct servent *sp; 150int s, utmpf; 151 152#define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we)) 153 154void run_as __P((uid_t *, gid_t *)); 155int configure __P((int)); 156void getboottime __P((int)); 157void onalrm __P((int)); 158void quit __P((char *)); 159void rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *)); 160int verify __P((char *, int)); 161static void usage __P((void)); 162#ifdef DEBUG 163char *interval __P((int, char *)); 164void Sendto __P((int, const void *, size_t, int, 165 const struct sockaddr *, int)); 166#define sendto Sendto 167#endif 168 169int 170main(argc, argv) 171 int argc; 172 char *argv[]; 173{ 174 struct sockaddr_in from; 175 struct stat st; 176 char path[64]; 177 int on = 1; 178 char *cp; 179 struct sockaddr_in sin; 180 uid_t unpriv_uid; 181 gid_t unpriv_gid; 182 183 if (getuid()) 184 errx(1, "not super user"); 185 186 run_as(&unpriv_uid, &unpriv_gid); 187 188 argv++; argc--; 189 while (argc > 0 && *argv[0] == '-') { 190 if (strcmp(*argv, "-m") == 0) { 191 if (argc > 1 && isdigit(*(argv + 1)[0])) { 192 argv++, argc--; 193 multicast_mode = SCOPED_MULTICAST; 194 multicast_scope = atoi(*argv); 195 if (multicast_scope > MAX_MULTICAST_SCOPE) 196 errx(1, "ttl must not exceed %u", 197 MAX_MULTICAST_SCOPE); 198 } 199 else multicast_mode = PER_INTERFACE_MULTICAST; 200 } 201 else if (strcmp(*argv, "-i") == 0) 202 insecure_mode = 1; 203 else if (strcmp(*argv, "-l") == 0) 204 quiet_mode = 1; 205 else if (strcmp(*argv, "-p") == 0) 206 iff_flag = 0; 207 else 208 usage(); 209 argv++, argc--; 210 } 211 if (argc > 0) 212 usage(); 213#ifndef DEBUG 214 daemon(1, 0); 215#endif 216 (void) signal(SIGHUP, getboottime); 217 openlog("rwhod", LOG_PID, LOG_DAEMON); 218 sp = getservbyname("who", "udp"); 219 if (sp == NULL) { 220 syslog(LOG_ERR, "udp/who: unknown service"); 221 exit(1); 222 } 223 if (chdir(_PATH_RWHODIR) < 0) { 224 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 225 exit(1); 226 } 227 /* 228 * Establish host name as returned by system. 229 */ 230 if (gethostname(myname, sizeof(myname) - 1) < 0) { 231 syslog(LOG_ERR, "gethostname: %m"); 232 exit(1); 233 } 234 if ((cp = index(myname, '.')) != NULL) 235 *cp = '\0'; 236 strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1); 237 mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0'; 238 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 239 if (utmpf < 0) { 240 syslog(LOG_ERR, "%s: %m", _PATH_UTMP); 241 exit(1); 242 } 243 getboottime(0); 244 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 245 syslog(LOG_ERR, "socket: %m"); 246 exit(1); 247 } 248 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 249 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 250 exit(1); 251 } 252 memset(&sin, 0, sizeof(sin)); 253 sin.sin_len = sizeof(sin); 254 sin.sin_family = AF_INET; 255 sin.sin_port = sp->s_port; 256 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 257 syslog(LOG_ERR, "bind: %m"); 258 exit(1); 259 } 260 setgid(unpriv_gid); 261 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 262 setuid(unpriv_uid); 263 if (!configure(s)) 264 exit(1); 265 if (!quiet_mode) { 266 signal(SIGALRM, onalrm); 267 onalrm(0); 268 } 269 for (;;) { 270 struct whod wd; 271 int cc, whod, len = sizeof(from); 272 273 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 274 (struct sockaddr *)&from, &len); 275 if (cc <= 0) { 276 if (cc < 0 && errno != EINTR) 277 syslog(LOG_WARNING, "recv: %m"); 278 continue; 279 } 280 if (from.sin_port != sp->s_port && !insecure_mode) { 281 syslog(LOG_WARNING, "%d: bad source port from %s", 282 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 283 continue; 284 } 285 if (cc < WHDRSIZE) { 286 syslog(LOG_WARNING, "short packet from %s", 287 inet_ntoa(from.sin_addr)); 288 continue; 289 } 290 if (wd.wd_vers != WHODVERSION) 291 continue; 292 if (wd.wd_type != WHODTYPE_STATUS) 293 continue; 294 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 295 syslog(LOG_WARNING, "malformed host name from %s", 296 inet_ntoa(from.sin_addr)); 297 continue; 298 } 299 (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 300 /* 301 * Rather than truncating and growing the file each time, 302 * use ftruncate if size is less than previous size. 303 */ 304 whod = open(path, O_WRONLY | O_CREAT, 0644); 305 if (whod < 0) { 306 syslog(LOG_WARNING, "%s: %m", path); 307 continue; 308 } 309#if ENDIAN != BIG_ENDIAN 310 { 311 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 312 struct whoent *we; 313 314 /* undo header byte swapping before writing to file */ 315 wd.wd_sendtime = ntohl(wd.wd_sendtime); 316 for (i = 0; i < 3; i++) 317 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 318 wd.wd_boottime = ntohl(wd.wd_boottime); 319 we = wd.wd_we; 320 for (i = 0; i < n; i++) { 321 we->we_idle = ntohl(we->we_idle); 322 we->we_utmp.out_time = 323 ntohl(we->we_utmp.out_time); 324 we++; 325 } 326 } 327#endif 328 (void) time((time_t *)&wd.wd_recvtime); 329 (void) write(whod, (char *)&wd, cc); 330 if (fstat(whod, &st) < 0 || st.st_size > cc) 331 ftruncate(whod, cc); 332 (void) close(whod); 333 } 334} 335 336static void 337usage() 338{ 339 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 340 exit(1); 341} 342 343void 344run_as(uid, gid) 345 uid_t *uid; 346 gid_t *gid; 347{ 348 struct passwd *pw; 349 struct group *gr; 350 351 pw = getpwnam(UNPRIV_USER); 352 if (!pw) { 353 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 354 exit(1); 355 } 356 *uid = pw->pw_uid; 357 358 gr = getgrnam(UNPRIV_GROUP); 359 if (!gr) { 360 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 361 exit(1); 362 } 363 *gid = gr->gr_gid; 364} 365 366/* 367 * Check out host name for unprintables 368 * and other funnies before allowing a file 369 * to be created. Sorry, but blanks aren't allowed. 370 */ 371int 372verify(name, maxlen) 373 register char *name; 374 register int maxlen; 375{ 376 register int size = 0; 377 378 while (*name && size < maxlen - 1) { 379 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 380 return (0); 381 name++, size++; 382 } 383 *name = '\0'; 384 return (size > 0); 385} 386 387int utmptime; 388int utmpent; 389int utmpsize = 0; 390struct utmp *utmp; 391int alarmcount; 392 393void 394onalrm(signo) 395 int signo; 396{ 397 register struct neighbor *np; 398 register struct whoent *we = mywd.wd_we, *wlast; 399 register int i; 400 struct stat stb; 401 double avenrun[3]; 402 time_t now; 403 int cc; 404 405 now = time(NULL); 406 if (alarmcount % 10 == 0) 407 getboottime(0); 408 alarmcount++; 409 (void) fstat(utmpf, &stb); 410 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 411 utmptime = stb.st_mtime; 412 if (stb.st_size > utmpsize) { 413 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 414 if (utmp) 415 utmp = (struct utmp *)realloc(utmp, utmpsize); 416 else 417 utmp = (struct utmp *)malloc(utmpsize); 418 if (! utmp) { 419 syslog(LOG_WARNING, "malloc failed"); 420 utmpsize = 0; 421 goto done; 422 } 423 } 424 (void) lseek(utmpf, (off_t)0, L_SET); 425 cc = read(utmpf, (char *)utmp, stb.st_size); 426 if (cc < 0) { 427 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 428 goto done; 429 } 430 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 431 utmpent = cc / sizeof(struct utmp); 432 for (i = 0; i < utmpent; i++) 433 if (utmp[i].ut_name[0]) { 434 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 435 sizeof(utmp[i].ut_line)); 436 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 437 sizeof(utmp[i].ut_name)); 438 we->we_utmp.out_time = htonl(utmp[i].ut_time); 439 if (we >= wlast) 440 break; 441 we++; 442 } 443 utmpent = we - mywd.wd_we; 444 } 445 446 /* 447 * The test on utmpent looks silly---after all, if no one is 448 * logged on, why worry about efficiency?---but is useful on 449 * (e.g.) compute servers. 450 */ 451 if (utmpent && chdir(_PATH_DEV)) { 452 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 453 exit(1); 454 } 455 we = mywd.wd_we; 456 for (i = 0; i < utmpent; i++) { 457 if (stat(we->we_utmp.out_line, &stb) >= 0) 458 we->we_idle = htonl(now - stb.st_atime); 459 we++; 460 } 461 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 462 for (i = 0; i < 3; i++) 463 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 464 cc = (char *)we - (char *)&mywd; 465 mywd.wd_sendtime = htonl(time(0)); 466 mywd.wd_vers = WHODVERSION; 467 mywd.wd_type = WHODTYPE_STATUS; 468 if (multicast_mode == SCOPED_MULTICAST) { 469 (void) sendto(s, (char *)&mywd, cc, 0, 470 (struct sockaddr *)&multicast_addr, 471 sizeof(multicast_addr)); 472 } 473 else for (np = neighbors; np != NULL; np = np->n_next) { 474 if (multicast_mode == PER_INTERFACE_MULTICAST && 475 np->n_flags & IFF_MULTICAST) { 476 /* 477 * Select the outgoing interface for the multicast. 478 */ 479 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 480 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 481 sizeof(struct in_addr)) < 0) { 482 syslog(LOG_ERR, 483 "setsockopt IP_MULTICAST_IF: %m"); 484 exit(1); 485 } 486 (void) sendto(s, (char *)&mywd, cc, 0, 487 (struct sockaddr *)&multicast_addr, 488 sizeof(multicast_addr)); 489 } else (void) sendto(s, (char *)&mywd, cc, 0, 490 np->n_addr, np->n_addrlen); 491 } 492 if (utmpent && chdir(_PATH_RWHODIR)) { 493 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 494 exit(1); 495 } 496done: 497 (void) alarm(AL_INTERVAL); 498} 499 500void 501getboottime(signo) 502 int signo; 503{ 504 int mib[2]; 505 size_t size; 506 struct timeval tm; 507 508 mib[0] = CTL_KERN; 509 mib[1] = KERN_BOOTTIME; 510 size = sizeof(tm); 511 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 512 syslog(LOG_ERR, "cannot get boottime: %m"); 513 exit(1); 514 } 515 mywd.wd_boottime = htonl(tm.tv_sec); 516} 517 518void 519quit(msg) 520 char *msg; 521{ 522 syslog(LOG_ERR, "%s", msg); 523 exit(1); 524} 525 526#define ROUNDUP(a) \ 527 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 528#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 529 530void 531rt_xaddrs(cp, cplim, rtinfo) 532 register caddr_t cp, cplim; 533 register struct rt_addrinfo *rtinfo; 534{ 535 register struct sockaddr *sa; 536 register int i; 537 538 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 539 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 540 if ((rtinfo->rti_addrs & (1 << i)) == 0) 541 continue; 542 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 543 ADVANCE(cp, sa); 544 } 545} 546 547/* 548 * Figure out device configuration and select 549 * networks which deserve status information. 550 */ 551int 552configure(s) 553 int s; 554{ 555 register struct neighbor *np; 556 register struct if_msghdr *ifm; 557 register struct ifa_msghdr *ifam; 558 struct sockaddr_dl *sdl; 559 size_t needed; 560 int mib[6], flags = 0, len; 561 char *buf, *lim, *next; 562 struct rt_addrinfo info; 563 564 if (multicast_mode != NO_MULTICAST) { 565 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 566 multicast_addr.sin_port = sp->s_port; 567 } 568 569 if (multicast_mode == SCOPED_MULTICAST) { 570 struct ip_mreq mreq; 571 unsigned char ttl; 572 573 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 574 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 575 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 576 &mreq, sizeof(mreq)) < 0) { 577 syslog(LOG_ERR, 578 "setsockopt IP_ADD_MEMBERSHIP: %m"); 579 return(0); 580 } 581 ttl = multicast_scope; 582 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, 583 &ttl, sizeof(ttl)) < 0) { 584 syslog(LOG_ERR, 585 "setsockopt IP_MULTICAST_TTL: %m"); 586 return(0); 587 } 588 return(1); 589 } 590 591 mib[0] = CTL_NET; 592 mib[1] = PF_ROUTE; 593 mib[2] = 0; 594 mib[3] = AF_INET; 595 mib[4] = NET_RT_IFLIST; 596 mib[5] = 0; 597 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 598 quit("route-sysctl-estimate"); 599 if ((buf = malloc(needed)) == NULL) 600 quit("malloc"); 601 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 602 quit("actual retrieval of interface table"); 603 lim = buf + needed; 604 605 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 606 for (next = buf; next < lim; next += ifm->ifm_msglen) { 607 ifm = (struct if_msghdr *)next; 608 if (ifm->ifm_type == RTM_IFINFO) { 609 sdl = (struct sockaddr_dl *)(ifm + 1); 610 flags = ifm->ifm_flags; 611 continue; 612 } 613 if ((flags & IFF_UP) == 0 || 614 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 615 IFF_MULTICAST : 0) | 616 IFF_BROADCAST|iff_flag)) == 0) 617 continue; 618 if (ifm->ifm_type != RTM_NEWADDR) 619 quit("out of sync parsing NET_RT_IFLIST"); 620 ifam = (struct ifa_msghdr *)ifm; 621 info.rti_addrs = ifam->ifam_addrs; 622 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 623 &info); 624 /* gag, wish we could get rid of Internet dependencies */ 625#define dstaddr info.rti_info[RTAX_BRD] 626#define ifaddr info.rti_info[RTAX_IFA] 627#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 628#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 629 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 630 continue; 631 PORT_SA(dstaddr) = sp->s_port; 632 for (np = neighbors; np != NULL; np = np->n_next) 633 if (memcmp(sdl->sdl_data, np->n_name, 634 sdl->sdl_nlen) == 0 && 635 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 636 break; 637 if (np != NULL) 638 continue; 639 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 640 np = (struct neighbor *)malloc(len); 641 if (np == NULL) 642 quit("malloc of neighbor structure"); 643 memset(np, 0, len); 644 np->n_flags = flags; 645 np->n_addr = (struct sockaddr *)(np + 1); 646 np->n_addrlen = dstaddr->sa_len; 647 np->n_name = np->n_addrlen + (char *)np->n_addr; 648 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 649 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 650 if (multicast_mode == PER_INTERFACE_MULTICAST && 651 (flags & IFF_MULTICAST) && 652 !(flags & IFF_LOOPBACK)) { 653 struct ip_mreq mreq; 654 655 memcpy((char *)np->n_addr, (char *)ifaddr, 656 np->n_addrlen); 657 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 658 mreq.imr_interface.s_addr = 659 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 660 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 661 &mreq, sizeof(mreq)) < 0) { 662 syslog(LOG_ERR, 663 "setsockopt IP_ADD_MEMBERSHIP: %m"); 664#if 0 665 /* Fall back to broadcast on this if. */ 666 np->n_flags &= ~IFF_MULTICAST; 667#else 668 free((char *)np); 669 continue; 670#endif 671 } 672 } 673 np->n_next = neighbors; 674 neighbors = np; 675 } 676 free(buf); 677 return (1); 678} 679 680#ifdef DEBUG 681void 682Sendto(s, buf, cc, flags, to, tolen) 683 int s; 684 const void *buf; 685 size_t cc; 686 int flags; 687 const struct sockaddr *to; 688 int tolen; 689{ 690 register struct whod *w = (struct whod *)buf; 691 register struct whoent *we; 692 struct sockaddr_in *sin = (struct sockaddr_in *)to; 693 694 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 695 ntohs(sin->sin_port)); 696 printf("hostname %s %s\n", w->wd_hostname, 697 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 698 printf("load %4.2f, %4.2f, %4.2f\n", 699 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 700 ntohl(w->wd_loadav[2]) / 100.0); 701 cc -= WHDRSIZE; 702 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 703 time_t t = ntohl(we->we_utmp.out_time); 704 printf("%-8.8s %s:%s %.12s", 705 we->we_utmp.out_name, 706 w->wd_hostname, we->we_utmp.out_line, 707 ctime(&t)+4); 708 we->we_idle = ntohl(we->we_idle) / 60; 709 if (we->we_idle) { 710 if (we->we_idle >= 100*60) 711 we->we_idle = 100*60 - 1; 712 if (we->we_idle >= 60) 713 printf(" %2d", we->we_idle / 60); 714 else 715 printf(" "); 716 printf(":%02d", we->we_idle % 60); 717 } 718 printf("\n"); 719 } 720} 721 722char * 723interval(time, updown) 724 int time; 725 char *updown; 726{ 727 static char resbuf[32]; 728 int days, hours, minutes; 729 730 if (time < 0 || time > 3*30*24*60*60) { 731 (void) sprintf(resbuf, " %s ??:??", updown); 732 return (resbuf); 733 } 734 minutes = (time + 59) / 60; /* round to minutes */ 735 hours = minutes / 60; minutes %= 60; 736 days = hours / 24; hours %= 24; 737 if (days) 738 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 739 updown, days, hours, minutes); 740 else 741 (void) sprintf(resbuf, "%s %2d:%02d", 742 updown, hours, minutes); 743 return (resbuf); 744} 745#endif 746