rwhod.c revision 252602
1/*- 2 * Copyright (c) 1983, 1993 The Regents of the University of California. 3 * 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 252602 2013-07-03 20:58:58Z pjd $"); 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 <grp.h> 64#include <netdb.h> 65#include <paths.h> 66#include <pwd.h> 67#include <stdio.h> 68#include <stdlib.h> 69#include <string.h> 70#include <syslog.h> 71#include <timeconv.h> 72#include <utmpx.h> 73#include <unistd.h> 74 75#define UNPRIV_USER "daemon" 76#define UNPRIV_GROUP "daemon" 77 78#define NO_MULTICAST 0 /* multicast modes */ 79#define PER_INTERFACE_MULTICAST 1 80#define SCOPED_MULTICAST 2 81 82#define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 83 84#define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 85 /* (belongs in protocols/rwhod.h) */ 86 87int insecure_mode; 88int quiet_mode; 89int iff_flag = IFF_POINTOPOINT; 90int multicast_mode = NO_MULTICAST; 91int multicast_scope; 92struct sockaddr_in multicast_addr = 93 { sizeof(multicast_addr), AF_INET, 0, { 0 }, { 0 } }; 94 95/* 96 * Alarm interval. Don't forget to change the down time check in ruptime 97 * if this is changed. 98 */ 99#define AL_INTERVAL (3 * 60) 100 101char myname[MAXHOSTNAMELEN]; 102 103/* 104 * We communicate with each neighbor in a list constructed at the time we're 105 * started up. Neighbors are currently directly connected via a hardware 106 * interface. 107 */ 108struct neighbor { 109 struct neighbor *n_next; 110 char *n_name; /* interface name */ 111 struct sockaddr *n_addr; /* who to send to */ 112 int n_addrlen; /* size of address */ 113 int n_flags; /* should forward?, interface flags */ 114}; 115 116struct neighbor *neighbors; 117struct whod mywd; 118struct servent *sp; 119int s; 120 121#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 122 123int configure(int so); 124void getboottime(int signo __unused); 125void onalrm(int signo __unused); 126void rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo); 127void run_as(uid_t *uid, gid_t *gid); 128void quit(const char *msg); 129int verify(char *name, int maxlen); 130static void usage(void); 131 132#ifdef DEBUG 133char *interval(int time, char *updown); 134void Sendto(int s, const void *buf, size_t cc, int flags, 135 const struct sockaddr *to, int tolen); 136#define sendto Sendto 137#endif 138 139/* 140 * This version of Berkeley's rwhod has been modified to use IP multicast 141 * datagrams, under control of a new command-line option: 142 * 143 * rwhod -m causes rwhod to use IP multicast (instead of 144 * broadcast or unicast) on all interfaces that have 145 * the IFF_MULTICAST flag set in their "ifnet" structs 146 * (excluding the loopback interface). The multicast 147 * reports are sent with a time-to-live of 1, to prevent 148 * forwarding beyond the directly-connected subnet(s). 149 * 150 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 151 * time-to-live of <ttl>, via a SINGLE interface rather 152 * than all interfaces. <ttl> must be between 0 and 153 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 154 * is different than "-m", in that "-m 1" specifies 155 * transmission on one interface only. 156 * 157 * When "-m" is used without a <ttl> argument, the program accepts multicast 158 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 159 * is given, it accepts multicast reports from only one interface, the one 160 * on which reports are sent (which may be controlled via the host's routing 161 * table). Regardless of the "-m" option, the program accepts broadcast or 162 * unicast reports from all interfaces. Thus, this program will hear the 163 * reports of old, non-multicasting rwhods, but, if multicasting is used, 164 * those old rwhods won't hear the reports generated by this program. 165 * 166 * -- Steve Deering, Stanford University, February 1989 167 */ 168int 169main(int argc, char *argv[]) 170{ 171 struct sockaddr_in from; 172 struct stat st; 173 char path[64]; 174 int on; 175 char *cp; 176 struct sockaddr_in soin; 177 uid_t unpriv_uid; 178 gid_t unpriv_gid; 179 180 on = 1; 181 if (getuid()) 182 errx(1, "not super user"); 183 184 run_as(&unpriv_uid, &unpriv_gid); 185 186 argv++; 187 argc--; 188 while (argc > 0 && *argv[0] == '-') { 189 if (strcmp(*argv, "-m") == 0) { 190 if (argc > 1 && isdigit(*(argv + 1)[0])) { 191 argv++; 192 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 { 200 multicast_mode = PER_INTERFACE_MULTICAST; 201 } 202 } else if (strcmp(*argv, "-i") == 0) { 203 insecure_mode = 1; 204 } else if (strcmp(*argv, "-l") == 0) { 205 quiet_mode = 1; 206 } else if (strcmp(*argv, "-p") == 0) { 207 iff_flag = 0; 208 } else { 209 usage(); 210 } 211 argv++; 212 argc--; 213 } 214 if (argc > 0) 215 usage(); 216#ifndef DEBUG 217 daemon(1, 0); 218#endif 219 (void) signal(SIGHUP, getboottime); 220 openlog("rwhod", LOG_PID, LOG_DAEMON); 221 sp = getservbyname("who", "udp"); 222 if (sp == NULL) { 223 syslog(LOG_ERR, "who/udp: unknown service"); 224 exit(1); 225 } 226 if (chdir(_PATH_RWHODIR) < 0) { 227 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 228 exit(1); 229 } 230 /* 231 * Establish host name as returned by system. 232 */ 233 if (gethostname(myname, sizeof(myname) - 1) < 0) { 234 syslog(LOG_ERR, "gethostname: %m"); 235 exit(1); 236 } 237 if ((cp = strchr(myname, '.')) != NULL) 238 *cp = '\0'; 239 strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname)); 240 getboottime(0); 241 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 242 syslog(LOG_ERR, "socket: %m"); 243 exit(1); 244 } 245 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 246 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 247 exit(1); 248 } 249 memset(&soin, 0, sizeof(soin)); 250 soin.sin_len = sizeof(soin); 251 soin.sin_family = AF_INET; 252 soin.sin_port = sp->s_port; 253 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) { 254 syslog(LOG_ERR, "bind: %m"); 255 exit(1); 256 } 257 if (setgid(unpriv_gid) != 0) { 258 syslog(LOG_ERR, "setgid: %m"); 259 exit(1); 260 } 261 if (setgroups(1, &unpriv_gid) != 0) { /* XXX BOGUS groups[0] = egid */ 262 syslog(LOG_ERR, "setgroups: %m"); 263 exit(1); 264 } 265 if (setuid(unpriv_uid) != 0) { 266 syslog(LOG_ERR, "setuid: %m"); 267 exit(1); 268 } 269 if (!configure(s)) 270 exit(1); 271 if (!quiet_mode) { 272 signal(SIGALRM, onalrm); 273 onalrm(0); 274 } 275 for (;;) { 276 struct whod wd; 277 socklen_t len; 278 int cc, whod; 279 time_t t; 280 281 len = sizeof(from); 282 cc = recvfrom(s, &wd, sizeof(wd), 0, (struct sockaddr *)&from, 283 &len); 284 if (cc <= 0) { 285 if (cc < 0 && errno != EINTR) 286 syslog(LOG_WARNING, "recv: %m"); 287 continue; 288 } 289 if (from.sin_port != sp->s_port && !insecure_mode) { 290 syslog(LOG_WARNING, "%d: bad source port from %s", 291 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 292 continue; 293 } 294 if (cc < WHDRSIZE) { 295 syslog(LOG_WARNING, "short packet from %s", 296 inet_ntoa(from.sin_addr)); 297 continue; 298 } 299 if (wd.wd_vers != WHODVERSION) 300 continue; 301 if (wd.wd_type != WHODTYPE_STATUS) 302 continue; 303 if (!verify(wd.wd_hostname, sizeof(wd.wd_hostname))) { 304 syslog(LOG_WARNING, "malformed host name from %s", 305 inet_ntoa(from.sin_addr)); 306 continue; 307 } 308 (void) snprintf(path, sizeof(path), "whod.%s", wd.wd_hostname); 309 /* 310 * Rather than truncating and growing the file each time, 311 * use ftruncate if size is less than previous size. 312 */ 313 whod = open(path, O_WRONLY | O_CREAT, 0644); 314 if (whod < 0) { 315 syslog(LOG_WARNING, "%s: %m", path); 316 continue; 317 } 318#if ENDIAN != BIG_ENDIAN 319 { 320 struct whoent *we; 321 int i, n; 322 323 n = (cc - WHDRSIZE) / sizeof(struct whoent); 324 /* undo header byte swapping before writing to file */ 325 wd.wd_sendtime = ntohl(wd.wd_sendtime); 326 for (i = 0; i < 3; i++) 327 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 328 wd.wd_boottime = ntohl(wd.wd_boottime); 329 we = wd.wd_we; 330 for (i = 0; i < n; i++) { 331 we->we_idle = ntohl(we->we_idle); 332 we->we_utmp.out_time = 333 ntohl(we->we_utmp.out_time); 334 we++; 335 } 336 } 337#endif 338 (void) time(&t); 339 wd.wd_recvtime = _time_to_int(t); 340 (void) write(whod, (char *)&wd, cc); 341 if (fstat(whod, &st) < 0 || st.st_size > cc) 342 ftruncate(whod, cc); 343 (void) close(whod); 344 } 345} 346 347static void 348usage(void) 349{ 350 351 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 352 exit(1); 353} 354 355void 356run_as(uid_t *uid, gid_t *gid) 357{ 358 struct passwd *pw; 359 struct group *gr; 360 361 pw = getpwnam(UNPRIV_USER); 362 if (pw == NULL) { 363 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 364 exit(1); 365 } 366 *uid = pw->pw_uid; 367 368 gr = getgrnam(UNPRIV_GROUP); 369 if (gr == NULL) { 370 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 371 exit(1); 372 } 373 *gid = gr->gr_gid; 374} 375 376/* 377 * Check out host name for unprintables 378 * and other funnies before allowing a file 379 * to be created. Sorry, but blanks aren't allowed. 380 */ 381int 382verify(char *name, int maxlen) 383{ 384 int size; 385 386 size = 0; 387 while (*name != '\0' && size < maxlen - 1) { 388 if (!isascii(*name) || !isalnum(*name) || ispunct(*name)) 389 return (0); 390 name++; 391 size++; 392 } 393 *name = '\0'; 394 return (size > 0); 395} 396 397void 398onalrm(int signo __unused) 399{ 400 static int alarmcount = 0; 401 double avenrun[3]; 402 time_t now; 403 int i, cc; 404 struct utmpx *ut; 405 struct stat stb; 406 struct neighbor *np; 407 struct whoent *we, *wend; 408 409 we = mywd.wd_we; 410 now = time(NULL); 411 if (alarmcount % 10 == 0) 412 getboottime(0); 413 alarmcount++; 414 wend = &mywd.wd_we[1024 / sizeof(struct whoent)]; 415 setutxent(); 416 while ((ut = getutxent()) != NULL && we < wend) { 417 if (ut->ut_type != USER_PROCESS) 418 continue; 419 strncpy(we->we_utmp.out_line, ut->ut_line, 420 sizeof(we->we_utmp.out_line)); 421 strncpy(we->we_utmp.out_name, ut->ut_user, 422 sizeof(we->we_utmp.out_name)); 423 we->we_utmp.out_time = 424 htonl(_time_to_time32(ut->ut_tv.tv_sec)); 425 we++; 426 } 427 endutxent(); 428 429 if (chdir(_PATH_DEV) < 0) { 430 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 431 exit(1); 432 } 433 wend = we; 434 for (we = mywd.wd_we; we < wend; we++) { 435 if (stat(we->we_utmp.out_line, &stb) >= 0) 436 we->we_idle = htonl(now - stb.st_atime); 437 we++; 438 } 439 (void) getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])); 440 for (i = 0; i < 3; i++) 441 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 442 cc = (char *)wend - (char *)&mywd; 443 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 444 mywd.wd_vers = WHODVERSION; 445 mywd.wd_type = WHODTYPE_STATUS; 446 if (multicast_mode == SCOPED_MULTICAST) { 447 (void) sendto(s, (char *)&mywd, cc, 0, 448 (struct sockaddr *)&multicast_addr, 449 sizeof(multicast_addr)); 450 } else { 451 for (np = neighbors; np != NULL; np = np->n_next) { 452 if (multicast_mode == PER_INTERFACE_MULTICAST && 453 (np->n_flags & IFF_MULTICAST) != 0) { 454 /* 455 * Select the outgoing interface for the 456 * multicast. 457 */ 458 if (setsockopt(s, IPPROTO_IP, 459 IP_MULTICAST_IF, 460 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 461 sizeof(struct in_addr)) < 0) { 462 syslog(LOG_ERR, 463 "setsockopt IP_MULTICAST_IF: %m"); 464 exit(1); 465 } 466 (void) sendto(s, (char *)&mywd, cc, 0, 467 (struct sockaddr *)&multicast_addr, 468 sizeof(multicast_addr)); 469 } else { 470 (void) sendto(s, (char *)&mywd, cc, 0, 471 np->n_addr, np->n_addrlen); 472 } 473 } 474 } 475 if (chdir(_PATH_RWHODIR) < 0) { 476 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 477 exit(1); 478 } 479 (void) alarm(AL_INTERVAL); 480} 481 482void 483getboottime(int signo __unused) 484{ 485 int mib[2]; 486 size_t size; 487 struct timeval tm; 488 489 mib[0] = CTL_KERN; 490 mib[1] = KERN_BOOTTIME; 491 size = sizeof(tm); 492 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 493 syslog(LOG_ERR, "cannot get boottime: %m"); 494 exit(1); 495 } 496 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 497} 498 499void 500quit(const char *msg) 501{ 502 503 syslog(LOG_ERR, "%s", msg); 504 exit(1); 505} 506 507void 508rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 509{ 510 struct sockaddr *sa; 511 int i; 512 513 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 514 for (i = 0; i < RTAX_MAX && cp < cplim; i++) { 515 if ((rtinfo->rti_addrs & (1 << i)) == 0) 516 continue; 517 sa = (struct sockaddr *)cp; 518 rtinfo->rti_info[i] = sa; 519 cp += SA_SIZE(sa); 520 } 521} 522 523/* 524 * Figure out device configuration and select 525 * networks which deserve status information. 526 */ 527int 528configure(int so) 529{ 530 struct neighbor *np; 531 struct if_msghdr *ifm; 532 struct ifa_msghdr *ifam; 533 struct sockaddr_dl *sdl; 534 size_t needed; 535 int mib[6], flags, lflags, len; 536 char *buf, *lim, *next; 537 struct rt_addrinfo info; 538 539 flags = 0; 540 if (multicast_mode != NO_MULTICAST) { 541 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 542 multicast_addr.sin_port = sp->s_port; 543 } 544 545 if (multicast_mode == SCOPED_MULTICAST) { 546 struct ip_mreq mreq; 547 unsigned char ttl; 548 549 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 550 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 551 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP, 552 &mreq, sizeof(mreq)) < 0) { 553 syslog(LOG_ERR, 554 "setsockopt IP_ADD_MEMBERSHIP: %m"); 555 return (0); 556 } 557 ttl = multicast_scope; 558 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, 559 sizeof(ttl)) < 0) { 560 syslog(LOG_ERR, 561 "setsockopt IP_MULTICAST_TTL: %m"); 562 return (0); 563 } 564 return (1); 565 } 566 567 mib[0] = CTL_NET; 568 mib[1] = PF_ROUTE; 569 mib[2] = 0; 570 mib[3] = AF_INET; 571 mib[4] = NET_RT_IFLIST; 572 mib[5] = 0; 573 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 574 quit("route-sysctl-estimate"); 575 if ((buf = malloc(needed)) == NULL) 576 quit("malloc"); 577 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 578 quit("actual retrieval of interface table"); 579 lim = buf + needed; 580 581 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 582 for (next = buf; next < lim; next += ifm->ifm_msglen) { 583 ifm = (struct if_msghdr *)next; 584 if (ifm->ifm_type == RTM_IFINFO) { 585 sdl = (struct sockaddr_dl *)(ifm + 1); 586 flags = ifm->ifm_flags; 587 continue; 588 } 589 if ((flags & IFF_UP) == 0) 590 continue; 591 lflags = IFF_BROADCAST | iff_flag; 592 if (multicast_mode == PER_INTERFACE_MULTICAST) 593 lflags |= IFF_MULTICAST; 594 if ((flags & lflags) == 0) 595 continue; 596 if (ifm->ifm_type != RTM_NEWADDR) 597 quit("out of sync parsing NET_RT_IFLIST"); 598 ifam = (struct ifa_msghdr *)ifm; 599 info.rti_addrs = ifam->ifam_addrs; 600 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 601 &info); 602 /* gag, wish we could get rid of Internet dependencies */ 603#define dstaddr info.rti_info[RTAX_BRD] 604#define ifaddr info.rti_info[RTAX_IFA] 605#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 606#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 607 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 608 continue; 609 PORT_SA(dstaddr) = sp->s_port; 610 for (np = neighbors; np != NULL; np = np->n_next) { 611 if (memcmp(sdl->sdl_data, np->n_name, 612 sdl->sdl_nlen) == 0 && 613 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) { 614 break; 615 } 616 } 617 if (np != NULL) 618 continue; 619 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 620 np = malloc(len); 621 if (np == NULL) 622 quit("malloc of neighbor structure"); 623 memset(np, 0, len); 624 np->n_flags = flags; 625 np->n_addr = (struct sockaddr *)(np + 1); 626 np->n_addrlen = dstaddr->sa_len; 627 np->n_name = np->n_addrlen + (char *)np->n_addr; 628 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 629 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 630 if (multicast_mode == PER_INTERFACE_MULTICAST && 631 (flags & IFF_MULTICAST) != 0 && 632 (flags & IFF_LOOPBACK) == 0) { 633 struct ip_mreq mreq; 634 635 memcpy((char *)np->n_addr, (char *)ifaddr, 636 np->n_addrlen); 637 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 638 mreq.imr_interface.s_addr = 639 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 640 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 641 &mreq, sizeof(mreq)) < 0) { 642 syslog(LOG_ERR, 643 "setsockopt IP_ADD_MEMBERSHIP: %m"); 644#if 0 645 /* Fall back to broadcast on this if. */ 646 np->n_flags &= ~IFF_MULTICAST; 647#else 648 free(np); 649 continue; 650#endif 651 } 652 } 653 np->n_next = neighbors; 654 neighbors = np; 655 } 656 free(buf); 657 return (1); 658} 659 660#ifdef DEBUG 661void 662Sendto(int s, const void *buf, size_t cc, int flags, const struct sockaddr *to, 663 int tolen) 664{ 665 struct whod *w; 666 struct whoent *we; 667 struct sockaddr_in *sin; 668 669 w = (struct whod *)buf; 670 sin = (struct sockaddr_in *)to; 671 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 672 ntohs(sin->sin_port)); 673 printf("hostname %s %s\n", w->wd_hostname, 674 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 675 printf("load %4.2f, %4.2f, %4.2f\n", 676 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 677 ntohl(w->wd_loadav[2]) / 100.0); 678 cc -= WHDRSIZE; 679 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 680 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time)); 681 682 printf("%-8.8s %s:%s %.12s", we->we_utmp.out_name, 683 w->wd_hostname, we->we_utmp.out_line, ctime(&t) + 4); 684 we->we_idle = ntohl(we->we_idle) / 60; 685 if (we->we_idle != 0) { 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 698char * 699interval(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; 710 minutes %= 60; 711 days = hours / 24; 712 hours %= 24; 713 if (days > 0) { 714 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 715 updown, days, hours, minutes); 716 } else { 717 (void) sprintf(resbuf, "%s %2d:%02d", 718 updown, hours, minutes); 719 } 720 return (resbuf); 721} 722#endif 723