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__attribute__((__used__)) 32static const char copyright[] = 33"@(#) Copyright (c) 1983, 1993\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35#endif /* not lint */ 36 37#if 0 38#ifndef lint 39static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; 40#endif /* not lint */ 41#endif 42 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: src/usr.sbin/rwhod/rwhod.c,v 1.23 2005/06/03 17:38:33 ssouhlal Exp $"); 45 46#include <sys/param.h> 47#include <sys/socket.h> 48#include <sys/stat.h> 49#include <sys/signal.h> 50#include <sys/ioctl.h> 51#include <sys/sysctl.h> 52 53#include <net/if.h> 54#include <net/if_dl.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#ifdef __APPLE__ 72#include <utmpx.h> 73#include <net/route.h> 74#else 75#include <utmp.h> 76#endif 77#include <pwd.h> 78#include <grp.h> 79 80/* 81 * This version of Berkeley's rwhod has been modified to use IP multicast 82 * datagrams, under control of a new command-line option: 83 * 84 * rwhod -m causes rwhod to use IP multicast (instead of 85 * broadcast or unicast) on all interfaces that have 86 * the IFF_MULTICAST flag set in their "ifnet" structs 87 * (excluding the loopback interface). The multicast 88 * reports are sent with a time-to-live of 1, to prevent 89 * forwarding beyond the directly-connected subnet(s). 90 * 91 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 92 * time-to-live of <ttl>, via a SINGLE interface rather 93 * than all interfaces. <ttl> must be between 0 and 94 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 95 * is different than "-m", in that "-m 1" specifies 96 * transmission on one interface only. 97 * 98 * When "-m" is used without a <ttl> argument, the program accepts multicast 99 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 100 * is given, it accepts multicast reports from only one interface, the one 101 * on which reports are sent (which may be controlled via the host's routing 102 * table). Regardless of the "-m" option, the program accepts broadcast or 103 * unicast reports from all interfaces. Thus, this program will hear the 104 * reports of old, non-multicasting rwhods, but, if multicasting is used, 105 * those old rwhods won't hear the reports generated by this program. 106 * 107 * -- Steve Deering, Stanford University, February 1989 108 */ 109 110#define UNPRIV_USER "daemon" 111#define UNPRIV_GROUP "daemon" 112 113#define NO_MULTICAST 0 /* multicast modes */ 114#define PER_INTERFACE_MULTICAST 1 115#define SCOPED_MULTICAST 2 116 117#define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 118 119#define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 120 /* (belongs in protocols/rwhod.h) */ 121 122int insecure_mode; 123int quiet_mode; 124int iff_flag = IFF_POINTOPOINT; 125int multicast_mode = NO_MULTICAST; 126int multicast_scope; 127struct sockaddr_in multicast_addr = 128 { sizeof multicast_addr, AF_INET, 0, { 0 }, { 0 } }; 129 130/* 131 * Alarm interval. Don't forget to change the down time check in ruptime 132 * if this is changed. 133 */ 134#define AL_INTERVAL (3 * 60) 135 136char myname[MAXHOSTNAMELEN]; 137 138/* 139 * We communicate with each neighbor in a list constructed at the time we're 140 * started up. Neighbors are currently directly connected via a hardware 141 * interface. 142 */ 143struct neighbor { 144 struct neighbor *n_next; 145 char *n_name; /* interface name */ 146 struct sockaddr *n_addr; /* who to send to */ 147 int n_addrlen; /* size of address */ 148 int n_flags; /* should forward?, interface flags */ 149}; 150 151struct neighbor *neighbors; 152struct whod mywd; 153struct servent *sp; 154int s, utmpf; 155 156#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 157 158void run_as(uid_t *, gid_t *); 159int configure(int); 160void getboottime(int); 161void onalrm(int); 162void quit(const char *); 163void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 164int verify(char *, int); 165static void usage(void); 166#ifdef DEBUG 167char *interval(int, char *); 168void Sendto(int, const void *, size_t, int, const struct sockaddr *, int); 169#define sendto Sendto 170#endif 171 172int 173main(int argc, char *argv[]) 174{ 175 struct sockaddr_in from; 176 struct stat st; 177 char path[64]; 178 int on = 1; 179 char *cp; 180 struct sockaddr_in soin; 181 uid_t unpriv_uid; 182 gid_t unpriv_gid; 183 184 if (getuid()) 185 errx(1, "not super user"); 186 187 run_as(&unpriv_uid, &unpriv_gid); 188 189 argv++; argc--; 190 while (argc > 0 && *argv[0] == '-') { 191 if (strcmp(*argv, "-m") == 0) { 192 if (argc > 1 && isdigit(*(argv + 1)[0])) { 193 argv++, argc--; 194 multicast_mode = SCOPED_MULTICAST; 195 multicast_scope = atoi(*argv); 196 if (multicast_scope > MAX_MULTICAST_SCOPE) 197 errx(1, "ttl must not exceed %u", 198 MAX_MULTICAST_SCOPE); 199 } 200 else 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 argv++, argc--; 211 } 212 if (argc > 0) 213 usage(); 214#ifndef DEBUG 215 daemon(1, 0); 216#endif 217 (void) signal(SIGHUP, getboottime); 218 openlog("rwhod", LOG_PID, LOG_DAEMON); 219 sp = getservbyname("who", "udp"); 220 if (sp == NULL) { 221 syslog(LOG_ERR, "who/udp: unknown service"); 222 exit(1); 223 } 224 if (chdir(_PATH_RWHODIR) < 0) { 225 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 226 exit(1); 227 } 228 /* 229 * Establish host name as returned by system. 230 */ 231 if (gethostname(myname, sizeof(myname) - 1) < 0) { 232 syslog(LOG_ERR, "gethostname: %m"); 233 exit(1); 234 } 235 if ((cp = index(myname, '.')) != NULL) 236 *cp = '\0'; 237 strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1); 238 mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0'; 239#ifdef __APPLE__ 240 utmpf = open(_PATH_UTMPX, O_RDONLY|O_CREAT, 0644); 241#else 242 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 243#endif 244 if (utmpf < 0) { 245#ifdef __APPLE__ 246 syslog(LOG_ERR, "%s: %m", _PATH_UTMPX); 247#else 248 syslog(LOG_ERR, "%s: %m", _PATH_UTMP); 249#endif 250 exit(1); 251 } 252 getboottime(0); 253 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 254 syslog(LOG_ERR, "socket: %m"); 255 exit(1); 256 } 257 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 258 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 259 exit(1); 260 } 261 memset(&soin, 0, sizeof(soin)); 262 soin.sin_len = sizeof(soin); 263 soin.sin_family = AF_INET; 264 soin.sin_port = sp->s_port; 265 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) { 266 syslog(LOG_ERR, "bind: %m"); 267 exit(1); 268 } 269 setgid(unpriv_gid); 270 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 271 setuid(unpriv_uid); 272 if (!configure(s)) 273 exit(1); 274 if (!quiet_mode) { 275 signal(SIGALRM, onalrm); 276 onalrm(0); 277 } 278 for (;;) { 279 struct whod wd; 280 socklen_t len = sizeof(from); 281 int cc, whod; 282 time_t t; 283 284 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 285 (struct sockaddr *)&from, &len); 286 if (cc <= 0) { 287 if (cc < 0 && errno != EINTR) 288 syslog(LOG_WARNING, "recv: %m"); 289 continue; 290 } 291 if (from.sin_port != sp->s_port && !insecure_mode) { 292 syslog(LOG_WARNING, "%d: bad source port from %s", 293 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 294 continue; 295 } 296 if (cc < WHDRSIZE) { 297 syslog(LOG_WARNING, "short packet from %s", 298 inet_ntoa(from.sin_addr)); 299 continue; 300 } 301 if (wd.wd_vers != WHODVERSION) 302 continue; 303 if (wd.wd_type != WHODTYPE_STATUS) 304 continue; 305 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 306 syslog(LOG_WARNING, "malformed host name from %s", 307 inet_ntoa(from.sin_addr)); 308 continue; 309 } 310 (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 311 /* 312 * Rather than truncating and growing the file each time, 313 * use ftruncate if size is less than previous size. 314 */ 315 whod = open(path, O_WRONLY | O_CREAT, 0644); 316 if (whod < 0) { 317 syslog(LOG_WARNING, "%s: %m", path); 318 continue; 319 } 320#if ENDIAN != BIG_ENDIAN 321 { 322 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 323 struct whoent *we; 324 325 /* undo header byte swapping before writing to file */ 326 wd.wd_sendtime = ntohl(wd.wd_sendtime); 327 for (i = 0; i < 3; i++) 328 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 329 wd.wd_boottime = ntohl(wd.wd_boottime); 330 we = wd.wd_we; 331 for (i = 0; i < n; i++) { 332 we->we_idle = ntohl(we->we_idle); 333 we->we_utmp.out_time = 334 ntohl(we->we_utmp.out_time); 335 we++; 336 } 337 } 338#endif 339 (void) time(&t); 340 wd.wd_recvtime = _time_to_int(t); 341 (void) write(whod, (char *)&wd, cc); 342 if (fstat(whod, &st) < 0 || st.st_size > cc) 343 ftruncate(whod, cc); 344 (void) close(whod); 345 } 346} 347 348static void 349usage() 350{ 351 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 352 exit(1); 353} 354 355void 356run_as(uid, gid) 357 uid_t *uid; 358 gid_t *gid; 359{ 360 struct passwd *pw; 361 struct group *gr; 362 363 pw = getpwnam(UNPRIV_USER); 364 if (!pw) { 365 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 366 exit(1); 367 } 368 *uid = pw->pw_uid; 369 370 gr = getgrnam(UNPRIV_GROUP); 371 if (!gr) { 372 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 373 exit(1); 374 } 375 *gid = gr->gr_gid; 376} 377 378/* 379 * Check out host name for unprintables 380 * and other funnies before allowing a file 381 * to be created. Sorry, but blanks aren't allowed. 382 */ 383int 384verify(name, maxlen) 385 register char *name; 386 register int maxlen; 387{ 388 register int size = 0; 389 390 while (*name && size < maxlen - 1) { 391 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 392 return (0); 393 name++, size++; 394 } 395 *name = '\0'; 396 return (size > 0); 397} 398 399int utmptime; 400int utmpent; 401int utmpsize = 0; 402#ifndef __APPLE__ 403struct utmp *utmp; 404#endif 405int alarmcount; 406 407void 408onalrm(signo) 409 int signo __unused; 410{ 411 register struct neighbor *np; 412 register struct whoent *we = mywd.wd_we, *wlast; 413 register int i; 414 struct stat stb; 415 double avenrun[3]; 416 time_t now; 417 int cc; 418#ifdef __APPLE__ 419 struct utmpx *u; 420#endif 421 422 now = time(NULL); 423 if (alarmcount % 10 == 0) 424 getboottime(0); 425 alarmcount++; 426 (void) fstat(utmpf, &stb); 427 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 428 utmptime = stb.st_mtime; 429#ifdef __APPLE__ 430 utmpsize = stb.st_size > utmpsize; 431 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 432 utmpent = 0; 433 setutxent(); 434 while ((u = getutxent()) != NULL) 435 if (u->ut_user[0] && u->ut_type == USER_PROCESS) { 436 memcpy(we->we_utmp.out_line, u->ut_line, 437 sizeof(we->we_utmp.out_line)); 438 memcpy(we->we_utmp.out_name, u->ut_user, 439 sizeof(we->we_utmp.out_name)); 440 we->we_utmp.out_time = htonl(u->ut_tv.tv_sec); 441 if (++we > wlast) 442 break; 443 } 444 endutxent(); 445#else 446 if (stb.st_size > utmpsize) { 447 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 448 utmp = (struct utmp *)reallocf(utmp, utmpsize); 449 if (utmp == NULL) { 450 syslog(LOG_WARNING, "malloc failed"); 451 utmpsize = 0; 452 goto done; 453 } 454 } 455 (void) lseek(utmpf, (off_t)0, L_SET); 456 cc = read(utmpf, (char *)utmp, stb.st_size); 457 if (cc < 0) { 458 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 459 goto done; 460 } 461 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 462 utmpent = cc / sizeof(struct utmp); 463 for (i = 0; i < utmpent; i++) 464 if (utmp[i].ut_name[0]) { 465 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 466 sizeof(utmp[i].ut_line)); 467 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 468 sizeof(utmp[i].ut_name)); 469 we->we_utmp.out_time = htonl(utmp[i].ut_time); 470 if (we >= wlast) 471 break; 472 we++; 473 } 474#endif 475 utmpent = we - mywd.wd_we; 476 } 477 478 /* 479 * The test on utmpent looks silly---after all, if no one is 480 * logged on, why worry about efficiency?---but is useful on 481 * (e.g.) compute servers. 482 */ 483 if (utmpent && chdir(_PATH_DEV)) { 484 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 485 exit(1); 486 } 487 we = mywd.wd_we; 488 for (i = 0; i < utmpent; i++) { 489 if (stat(we->we_utmp.out_line, &stb) >= 0) 490 we->we_idle = htonl(now - stb.st_atime); 491 we++; 492 } 493 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 494 for (i = 0; i < 3; i++) 495 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 496 cc = (char *)we - (char *)&mywd; 497 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 498 mywd.wd_vers = WHODVERSION; 499 mywd.wd_type = WHODTYPE_STATUS; 500 if (multicast_mode == SCOPED_MULTICAST) { 501 (void) sendto(s, (char *)&mywd, cc, 0, 502 (struct sockaddr *)&multicast_addr, 503 sizeof(multicast_addr)); 504 } 505 else for (np = neighbors; np != NULL; np = np->n_next) { 506 if (multicast_mode == PER_INTERFACE_MULTICAST && 507 np->n_flags & IFF_MULTICAST) { 508 /* 509 * Select the outgoing interface for the multicast. 510 */ 511 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 512 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 513 sizeof(struct in_addr)) < 0) { 514 syslog(LOG_ERR, 515 "setsockopt IP_MULTICAST_IF: %m"); 516 exit(1); 517 } 518 (void) sendto(s, (char *)&mywd, cc, 0, 519 (struct sockaddr *)&multicast_addr, 520 sizeof(multicast_addr)); 521 } else (void) sendto(s, (char *)&mywd, cc, 0, 522 np->n_addr, np->n_addrlen); 523 } 524 if (utmpent && chdir(_PATH_RWHODIR)) { 525 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 526 exit(1); 527 } 528#ifndef __APPLE__ 529done: 530#endif 531 (void) alarm(AL_INTERVAL); 532} 533 534void 535getboottime(signo) 536 int signo __unused; 537{ 538 int mib[2]; 539 size_t size; 540 struct timeval tm; 541 542 mib[0] = CTL_KERN; 543 mib[1] = KERN_BOOTTIME; 544 size = sizeof(tm); 545 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 546 syslog(LOG_ERR, "cannot get boottime: %m"); 547 exit(1); 548 } 549 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 550} 551 552void 553quit(msg) 554 const char *msg; 555{ 556 syslog(LOG_ERR, "%s", msg); 557 exit(1); 558} 559 560#ifdef __APPLE__ 561/* 562 * This macro returns the size of a struct sockaddr when passed 563 * through a routing socket. Basically we round up sa_len to 564 * a multiple of sizeof(long), with a minimum of sizeof(long). 565 * The check for a NULL pointer is just a convenience, probably never used. 566 * The case sa_len == 0 should only apply to empty structures. 567 */ 568#define SA_SIZE(sa) \ 569 ( (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ? \ 570 sizeof(long) : \ 571 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) ) 572#endif 573 574void 575rt_xaddrs(cp, cplim, rtinfo) 576 register caddr_t cp, cplim; 577 register struct rt_addrinfo *rtinfo; 578{ 579 register struct sockaddr *sa; 580 register int i; 581 582 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 583 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 584 if ((rtinfo->rti_addrs & (1 << i)) == 0) 585 continue; 586 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 587 cp += SA_SIZE(sa); 588 } 589} 590 591/* 592 * Figure out device configuration and select 593 * networks which deserve status information. 594 */ 595int 596configure(so) 597 int so; 598{ 599 register struct neighbor *np; 600 register struct if_msghdr *ifm; 601 register struct ifa_msghdr *ifam; 602 struct sockaddr_dl *sdl; 603 size_t needed; 604 int mib[6], flags = 0, len; 605 char *buf, *lim, *next; 606 struct rt_addrinfo info; 607 608 if (multicast_mode != NO_MULTICAST) { 609 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 610 multicast_addr.sin_port = sp->s_port; 611 } 612 613 if (multicast_mode == SCOPED_MULTICAST) { 614 struct ip_mreq mreq; 615 unsigned char ttl; 616 617 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 618 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 619 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP, 620 &mreq, sizeof(mreq)) < 0) { 621 syslog(LOG_ERR, 622 "setsockopt IP_ADD_MEMBERSHIP: %m"); 623 return(0); 624 } 625 ttl = multicast_scope; 626 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, 627 &ttl, sizeof(ttl)) < 0) { 628 syslog(LOG_ERR, 629 "setsockopt IP_MULTICAST_TTL: %m"); 630 return(0); 631 } 632 return(1); 633 } 634 635 mib[0] = CTL_NET; 636 mib[1] = PF_ROUTE; 637 mib[2] = 0; 638 mib[3] = AF_INET; 639 mib[4] = NET_RT_IFLIST; 640 mib[5] = 0; 641 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 642 quit("route-sysctl-estimate"); 643 if ((buf = malloc(needed)) == NULL) 644 quit("malloc"); 645 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 646 quit("actual retrieval of interface table"); 647 lim = buf + needed; 648 649 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 650 for (next = buf; next < lim; next += ifm->ifm_msglen) { 651 ifm = (struct if_msghdr *)next; 652 if (ifm->ifm_type == RTM_IFINFO) { 653 sdl = (struct sockaddr_dl *)(ifm + 1); 654 flags = ifm->ifm_flags; 655 continue; 656 } 657 if ((flags & IFF_UP) == 0 || 658 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 659 IFF_MULTICAST : 0) | 660 IFF_BROADCAST|iff_flag)) == 0) 661 continue; 662 if (ifm->ifm_type != RTM_NEWADDR) 663 quit("out of sync parsing NET_RT_IFLIST"); 664 ifam = (struct ifa_msghdr *)ifm; 665 info.rti_addrs = ifam->ifam_addrs; 666 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 667 &info); 668 /* gag, wish we could get rid of Internet dependencies */ 669#define dstaddr info.rti_info[RTAX_BRD] 670#define ifaddr info.rti_info[RTAX_IFA] 671#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 672#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 673 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 674 continue; 675 PORT_SA(dstaddr) = sp->s_port; 676 for (np = neighbors; np != NULL; np = np->n_next) 677 if (memcmp(sdl->sdl_data, np->n_name, 678 sdl->sdl_nlen) == 0 && 679 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 680 break; 681 if (np != NULL) 682 continue; 683 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 684 np = (struct neighbor *)malloc(len); 685 if (np == NULL) 686 quit("malloc of neighbor structure"); 687 memset(np, 0, len); 688 np->n_flags = flags; 689 np->n_addr = (struct sockaddr *)(np + 1); 690 np->n_addrlen = dstaddr->sa_len; 691 np->n_name = np->n_addrlen + (char *)np->n_addr; 692 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 693 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 694 if (multicast_mode == PER_INTERFACE_MULTICAST && 695 (flags & IFF_MULTICAST) && 696 !(flags & IFF_LOOPBACK)) { 697 struct ip_mreq mreq; 698 699 memcpy((char *)np->n_addr, (char *)ifaddr, 700 np->n_addrlen); 701 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 702 mreq.imr_interface.s_addr = 703 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 704 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 705 &mreq, sizeof(mreq)) < 0) { 706 syslog(LOG_ERR, 707 "setsockopt IP_ADD_MEMBERSHIP: %m"); 708#if 0 709 /* Fall back to broadcast on this if. */ 710 np->n_flags &= ~IFF_MULTICAST; 711#else 712 free((char *)np); 713 continue; 714#endif 715 } 716 } 717 np->n_next = neighbors; 718 neighbors = np; 719 } 720 free(buf); 721 return (1); 722} 723 724#ifdef DEBUG 725void 726Sendto(s, buf, cc, flags, to, tolen) 727 int s; 728 const void *buf; 729 size_t cc; 730 int flags; 731 const struct sockaddr *to; 732 int tolen; 733{ 734 register struct whod *w = (struct whod *)buf; 735 register struct whoent *we; 736 struct sockaddr_in *sin = (struct sockaddr_in *)to; 737 738 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 739 ntohs(sin->sin_port)); 740 printf("hostname %s %s\n", w->wd_hostname, 741 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 742 printf("load %4.2f, %4.2f, %4.2f\n", 743 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 744 ntohl(w->wd_loadav[2]) / 100.0); 745 cc -= WHDRSIZE; 746 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 747 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time)); 748 printf("%-8.8s %s:%s %.12s", 749 we->we_utmp.out_name, 750 w->wd_hostname, we->we_utmp.out_line, 751 ctime(&t)+4); 752 we->we_idle = ntohl(we->we_idle) / 60; 753 if (we->we_idle) { 754 if (we->we_idle >= 100*60) 755 we->we_idle = 100*60 - 1; 756 if (we->we_idle >= 60) 757 printf(" %2d", we->we_idle / 60); 758 else 759 printf(" "); 760 printf(":%02d", we->we_idle % 60); 761 } 762 printf("\n"); 763 } 764} 765 766char * 767interval(time, updown) 768 int time; 769 char *updown; 770{ 771 static char resbuf[32]; 772 int days, hours, minutes; 773 774 if (time < 0 || time > 3*30*24*60*60) { 775 (void) sprintf(resbuf, " %s ??:??", updown); 776 return (resbuf); 777 } 778 minutes = (time + 59) / 60; /* round to minutes */ 779 hours = minutes / 60; minutes %= 60; 780 days = hours / 24; hours %= 24; 781 if (days) 782 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 783 updown, days, hours, minutes); 784 else 785 (void) sprintf(resbuf, "%s %2d:%02d", 786 updown, hours, minutes); 787 return (resbuf); 788} 789#endif 790