rwhod.c revision 146940
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 31static 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 38static 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: head/usr.sbin/rwhod/rwhod.c 146940 2005-06-03 17:38:33Z ssouhlal $"); 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 117int insecure_mode; 118int quiet_mode; 119int iff_flag = IFF_POINTOPOINT; 120int multicast_mode = NO_MULTICAST; 121int multicast_scope; 122struct 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 131char 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 */ 138struct 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 146struct neighbor *neighbors; 147struct whod mywd; 148struct servent *sp; 149int s, utmpf; 150 151#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 152 153void run_as(uid_t *, gid_t *); 154int configure(int); 155void getboottime(int); 156void onalrm(int); 157void quit(const char *); 158void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 159int verify(char *, int); 160static void usage(void); 161#ifdef DEBUG 162char *interval(int, char *); 163void Sendto(int, const void *, size_t, int, const struct sockaddr *, int); 164#define sendto Sendto 165#endif 166 167int 168main(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 socklen_t len = sizeof(from); 268 int cc, whod; 269 time_t t; 270 271 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 272 (struct sockaddr *)&from, &len); 273 if (cc <= 0) { 274 if (cc < 0 && errno != EINTR) 275 syslog(LOG_WARNING, "recv: %m"); 276 continue; 277 } 278 if (from.sin_port != sp->s_port && !insecure_mode) { 279 syslog(LOG_WARNING, "%d: bad source port from %s", 280 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 281 continue; 282 } 283 if (cc < WHDRSIZE) { 284 syslog(LOG_WARNING, "short packet from %s", 285 inet_ntoa(from.sin_addr)); 286 continue; 287 } 288 if (wd.wd_vers != WHODVERSION) 289 continue; 290 if (wd.wd_type != WHODTYPE_STATUS) 291 continue; 292 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 293 syslog(LOG_WARNING, "malformed host name from %s", 294 inet_ntoa(from.sin_addr)); 295 continue; 296 } 297 (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 298 /* 299 * Rather than truncating and growing the file each time, 300 * use ftruncate if size is less than previous size. 301 */ 302 whod = open(path, O_WRONLY | O_CREAT, 0644); 303 if (whod < 0) { 304 syslog(LOG_WARNING, "%s: %m", path); 305 continue; 306 } 307#if ENDIAN != BIG_ENDIAN 308 { 309 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 310 struct whoent *we; 311 312 /* undo header byte swapping before writing to file */ 313 wd.wd_sendtime = ntohl(wd.wd_sendtime); 314 for (i = 0; i < 3; i++) 315 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 316 wd.wd_boottime = ntohl(wd.wd_boottime); 317 we = wd.wd_we; 318 for (i = 0; i < n; i++) { 319 we->we_idle = ntohl(we->we_idle); 320 we->we_utmp.out_time = 321 ntohl(we->we_utmp.out_time); 322 we++; 323 } 324 } 325#endif 326 (void) time(&t); 327 wd.wd_recvtime = _time_to_int(t); 328 (void) write(whod, (char *)&wd, cc); 329 if (fstat(whod, &st) < 0 || st.st_size > cc) 330 ftruncate(whod, cc); 331 (void) close(whod); 332 } 333} 334 335static void 336usage() 337{ 338 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 339 exit(1); 340} 341 342void 343run_as(uid, gid) 344 uid_t *uid; 345 gid_t *gid; 346{ 347 struct passwd *pw; 348 struct group *gr; 349 350 pw = getpwnam(UNPRIV_USER); 351 if (!pw) { 352 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 353 exit(1); 354 } 355 *uid = pw->pw_uid; 356 357 gr = getgrnam(UNPRIV_GROUP); 358 if (!gr) { 359 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 360 exit(1); 361 } 362 *gid = gr->gr_gid; 363} 364 365/* 366 * Check out host name for unprintables 367 * and other funnies before allowing a file 368 * to be created. Sorry, but blanks aren't allowed. 369 */ 370int 371verify(name, maxlen) 372 register char *name; 373 register int maxlen; 374{ 375 register int size = 0; 376 377 while (*name && size < maxlen - 1) { 378 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 379 return (0); 380 name++, size++; 381 } 382 *name = '\0'; 383 return (size > 0); 384} 385 386int utmptime; 387int utmpent; 388int utmpsize = 0; 389struct utmp *utmp; 390int alarmcount; 391 392void 393onalrm(signo) 394 int signo __unused; 395{ 396 register struct neighbor *np; 397 register struct whoent *we = mywd.wd_we, *wlast; 398 register int i; 399 struct stat stb; 400 double avenrun[3]; 401 time_t now; 402 int cc; 403 404 now = time(NULL); 405 if (alarmcount % 10 == 0) 406 getboottime(0); 407 alarmcount++; 408 (void) fstat(utmpf, &stb); 409 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 410 utmptime = stb.st_mtime; 411 if (stb.st_size > utmpsize) { 412 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 413 utmp = (struct utmp *)reallocf(utmp, utmpsize); 414 if (utmp == NULL) { 415 syslog(LOG_WARNING, "malloc failed"); 416 utmpsize = 0; 417 goto done; 418 } 419 } 420 (void) lseek(utmpf, (off_t)0, L_SET); 421 cc = read(utmpf, (char *)utmp, stb.st_size); 422 if (cc < 0) { 423 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 424 goto done; 425 } 426 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 427 utmpent = cc / sizeof(struct utmp); 428 for (i = 0; i < utmpent; i++) 429 if (utmp[i].ut_name[0]) { 430 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 431 sizeof(utmp[i].ut_line)); 432 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 433 sizeof(utmp[i].ut_name)); 434 we->we_utmp.out_time = htonl(utmp[i].ut_time); 435 if (we >= wlast) 436 break; 437 we++; 438 } 439 utmpent = we - mywd.wd_we; 440 } 441 442 /* 443 * The test on utmpent looks silly---after all, if no one is 444 * logged on, why worry about efficiency?---but is useful on 445 * (e.g.) compute servers. 446 */ 447 if (utmpent && chdir(_PATH_DEV)) { 448 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 449 exit(1); 450 } 451 we = mywd.wd_we; 452 for (i = 0; i < utmpent; i++) { 453 if (stat(we->we_utmp.out_line, &stb) >= 0) 454 we->we_idle = htonl(now - stb.st_atime); 455 we++; 456 } 457 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 458 for (i = 0; i < 3; i++) 459 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 460 cc = (char *)we - (char *)&mywd; 461 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 462 mywd.wd_vers = WHODVERSION; 463 mywd.wd_type = WHODTYPE_STATUS; 464 if (multicast_mode == SCOPED_MULTICAST) { 465 (void) sendto(s, (char *)&mywd, cc, 0, 466 (struct sockaddr *)&multicast_addr, 467 sizeof(multicast_addr)); 468 } 469 else for (np = neighbors; np != NULL; np = np->n_next) { 470 if (multicast_mode == PER_INTERFACE_MULTICAST && 471 np->n_flags & IFF_MULTICAST) { 472 /* 473 * Select the outgoing interface for the multicast. 474 */ 475 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 476 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 477 sizeof(struct in_addr)) < 0) { 478 syslog(LOG_ERR, 479 "setsockopt IP_MULTICAST_IF: %m"); 480 exit(1); 481 } 482 (void) sendto(s, (char *)&mywd, cc, 0, 483 (struct sockaddr *)&multicast_addr, 484 sizeof(multicast_addr)); 485 } else (void) sendto(s, (char *)&mywd, cc, 0, 486 np->n_addr, np->n_addrlen); 487 } 488 if (utmpent && chdir(_PATH_RWHODIR)) { 489 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 490 exit(1); 491 } 492done: 493 (void) alarm(AL_INTERVAL); 494} 495 496void 497getboottime(signo) 498 int signo __unused; 499{ 500 int mib[2]; 501 size_t size; 502 struct timeval tm; 503 504 mib[0] = CTL_KERN; 505 mib[1] = KERN_BOOTTIME; 506 size = sizeof(tm); 507 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 508 syslog(LOG_ERR, "cannot get boottime: %m"); 509 exit(1); 510 } 511 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 512} 513 514void 515quit(msg) 516 const char *msg; 517{ 518 syslog(LOG_ERR, "%s", msg); 519 exit(1); 520} 521 522void 523rt_xaddrs(cp, cplim, rtinfo) 524 register caddr_t cp, cplim; 525 register struct rt_addrinfo *rtinfo; 526{ 527 register struct sockaddr *sa; 528 register int i; 529 530 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 531 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 532 if ((rtinfo->rti_addrs & (1 << i)) == 0) 533 continue; 534 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 535 cp += SA_SIZE(sa); 536 } 537} 538 539/* 540 * Figure out device configuration and select 541 * networks which deserve status information. 542 */ 543int 544configure(so) 545 int so; 546{ 547 register struct neighbor *np; 548 register struct if_msghdr *ifm; 549 register struct ifa_msghdr *ifam; 550 struct sockaddr_dl *sdl; 551 size_t needed; 552 int mib[6], flags = 0, len; 553 char *buf, *lim, *next; 554 struct rt_addrinfo info; 555 556 if (multicast_mode != NO_MULTICAST) { 557 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 558 multicast_addr.sin_port = sp->s_port; 559 } 560 561 if (multicast_mode == SCOPED_MULTICAST) { 562 struct ip_mreq mreq; 563 unsigned char ttl; 564 565 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 566 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 567 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP, 568 &mreq, sizeof(mreq)) < 0) { 569 syslog(LOG_ERR, 570 "setsockopt IP_ADD_MEMBERSHIP: %m"); 571 return(0); 572 } 573 ttl = multicast_scope; 574 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, 575 &ttl, sizeof(ttl)) < 0) { 576 syslog(LOG_ERR, 577 "setsockopt IP_MULTICAST_TTL: %m"); 578 return(0); 579 } 580 return(1); 581 } 582 583 mib[0] = CTL_NET; 584 mib[1] = PF_ROUTE; 585 mib[2] = 0; 586 mib[3] = AF_INET; 587 mib[4] = NET_RT_IFLIST; 588 mib[5] = 0; 589 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 590 quit("route-sysctl-estimate"); 591 if ((buf = malloc(needed)) == NULL) 592 quit("malloc"); 593 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 594 quit("actual retrieval of interface table"); 595 lim = buf + needed; 596 597 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 598 for (next = buf; next < lim; next += ifm->ifm_msglen) { 599 ifm = (struct if_msghdr *)next; 600 if (ifm->ifm_type == RTM_IFINFO) { 601 sdl = (struct sockaddr_dl *)(ifm + 1); 602 flags = ifm->ifm_flags; 603 continue; 604 } 605 if ((flags & IFF_UP) == 0 || 606 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 607 IFF_MULTICAST : 0) | 608 IFF_BROADCAST|iff_flag)) == 0) 609 continue; 610 if (ifm->ifm_type != RTM_NEWADDR) 611 quit("out of sync parsing NET_RT_IFLIST"); 612 ifam = (struct ifa_msghdr *)ifm; 613 info.rti_addrs = ifam->ifam_addrs; 614 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 615 &info); 616 /* gag, wish we could get rid of Internet dependencies */ 617#define dstaddr info.rti_info[RTAX_BRD] 618#define ifaddr info.rti_info[RTAX_IFA] 619#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 620#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 621 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 622 continue; 623 PORT_SA(dstaddr) = sp->s_port; 624 for (np = neighbors; np != NULL; np = np->n_next) 625 if (memcmp(sdl->sdl_data, np->n_name, 626 sdl->sdl_nlen) == 0 && 627 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 628 break; 629 if (np != NULL) 630 continue; 631 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 632 np = (struct neighbor *)malloc(len); 633 if (np == NULL) 634 quit("malloc of neighbor structure"); 635 memset(np, 0, len); 636 np->n_flags = flags; 637 np->n_addr = (struct sockaddr *)(np + 1); 638 np->n_addrlen = dstaddr->sa_len; 639 np->n_name = np->n_addrlen + (char *)np->n_addr; 640 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 641 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 642 if (multicast_mode == PER_INTERFACE_MULTICAST && 643 (flags & IFF_MULTICAST) && 644 !(flags & IFF_LOOPBACK)) { 645 struct ip_mreq mreq; 646 647 memcpy((char *)np->n_addr, (char *)ifaddr, 648 np->n_addrlen); 649 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 650 mreq.imr_interface.s_addr = 651 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 652 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 653 &mreq, sizeof(mreq)) < 0) { 654 syslog(LOG_ERR, 655 "setsockopt IP_ADD_MEMBERSHIP: %m"); 656#if 0 657 /* Fall back to broadcast on this if. */ 658 np->n_flags &= ~IFF_MULTICAST; 659#else 660 free((char *)np); 661 continue; 662#endif 663 } 664 } 665 np->n_next = neighbors; 666 neighbors = np; 667 } 668 free(buf); 669 return (1); 670} 671 672#ifdef DEBUG 673void 674Sendto(s, buf, cc, flags, to, tolen) 675 int s; 676 const void *buf; 677 size_t cc; 678 int flags; 679 const struct sockaddr *to; 680 int tolen; 681{ 682 register struct whod *w = (struct whod *)buf; 683 register struct whoent *we; 684 struct sockaddr_in *sin = (struct sockaddr_in *)to; 685 686 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 687 ntohs(sin->sin_port)); 688 printf("hostname %s %s\n", w->wd_hostname, 689 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 690 printf("load %4.2f, %4.2f, %4.2f\n", 691 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 692 ntohl(w->wd_loadav[2]) / 100.0); 693 cc -= WHDRSIZE; 694 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 695 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time)); 696 printf("%-8.8s %s:%s %.12s", 697 we->we_utmp.out_name, 698 w->wd_hostname, we->we_utmp.out_line, 699 ctime(&t)+4); 700 we->we_idle = ntohl(we->we_idle) / 60; 701 if (we->we_idle) { 702 if (we->we_idle >= 100*60) 703 we->we_idle = 100*60 - 1; 704 if (we->we_idle >= 60) 705 printf(" %2d", we->we_idle / 60); 706 else 707 printf(" "); 708 printf(":%02d", we->we_idle % 60); 709 } 710 printf("\n"); 711 } 712} 713 714char * 715interval(time, updown) 716 int time; 717 char *updown; 718{ 719 static char resbuf[32]; 720 int days, hours, minutes; 721 722 if (time < 0 || time > 3*30*24*60*60) { 723 (void) sprintf(resbuf, " %s ??:??", updown); 724 return (resbuf); 725 } 726 minutes = (time + 59) / 60; /* round to minutes */ 727 hours = minutes / 60; minutes %= 60; 728 days = hours / 24; hours %= 24; 729 if (days) 730 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 731 updown, days, hours, minutes); 732 else 733 (void) sprintf(resbuf, "%s %2d:%02d", 734 updown, hours, minutes); 735 return (resbuf); 736} 737#endif 738