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 1.24 2007/12/27 15:29:40 matthias 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 <libutil.h> 58 #include <netdb.h> 59 #include <paths.h> 60 #include <poll.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <syslog.h> 65 #include <unistd.h> 66 #include <utmp.h> 67 #include <pwd.h> 68 #include <grp.h> 69 70 /* 71 * This version of Berkeley's rwhod has been modified to use IP multicast 72 * datagrams, under control of a new command-line option: 73 * 74 * rwhod -m causes rwhod to use IP multicast (instead of 75 * broadcast or unicast) on all interfaces that have 76 * the IFF_MULTICAST flag set in their "ifnet" structs 77 * (excluding the loopback interface). The multicast 78 * reports are sent with a time-to-live of 1, to prevent 79 * forwarding beyond the directly-connected subnet(s). 80 * 81 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 82 * time-to-live of <ttl>, via a SINGLE interface rather 83 * than all interfaces. <ttl> must be between 0 and 84 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 85 * is different than "-m", in that "-m 1" specifies 86 * transmission on one interface only. 87 * 88 * When "-m" is used without a <ttl> argument, the program accepts multicast 89 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 90 * is given, it accepts multicast reports from only one interface, the one 91 * on which reports are sent (which may be controlled via the host's routing 92 * table). Regardless of the "-m" option, the program accepts broadcast or 93 * unicast reports from all interfaces. Thus, this program will hear the 94 * reports of old, non-multicasting rwhods, but, if multicasting is used, 95 * those old rwhods won't hear the reports generated by this program. 96 * 97 * -- Steve Deering, Stanford University, February 1989 98 */ 99 100 #define UNPRIV_USER "daemon" 101 #define UNPRIV_GROUP "daemon" 102 103 #define WITH_ERRNO 1 /* Write to syslog with errno (%m) */ 104 #define WITHOUT_ERRNO 0 /* Write to syslog without errno */ 105 106 #define NO_MULTICAST 0 /* multicast modes */ 107 #define PER_INTERFACE_MULTICAST 1 108 #define SCOPED_MULTICAST 2 109 110 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 111 112 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 113 /* (belongs in protocols/rwhod.h) */ 114 115 int insecure_mode; 116 int quiet_mode; 117 int iff_flag = IFF_POINTOPOINT; 118 int multicast_mode = NO_MULTICAST; 119 int multicast_scope; 120 struct sockaddr_in multicast_addr; 121 122 char myname[MAXHOSTNAMELEN]; 123 124 /* 125 * We communicate with each neighbor in a list constructed at the time we're 126 * started up. Neighbors are currently directly connected via a hardware 127 * interface. 128 */ 129 struct neighbor { 130 struct neighbor *n_next; 131 char *n_name; /* interface name */ 132 struct sockaddr *n_addr; /* who to send to */ 133 int n_addrlen; /* size of address */ 134 int n_flags; /* should forward?, interface flags */ 135 }; 136 137 struct neighbor *neighbors; 138 struct whod mywd; 139 struct servent *sp; 140 int s, utmpf; 141 volatile sig_atomic_t onsighup; 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(void); 148 void send_host_information(void); 149 void hup(int); 150 void quit(const char *, int); 151 void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 152 int verify(char *, int); 153 void handleread(int); 154 static void usage(void); 155 void timeadd(struct timeval *, time_t, struct timeval *); 156 157 #ifdef DEBUG 158 char *interval(int, const char *); 159 ssize_t Sendto(int, const void *, size_t, int, 160 const struct sockaddr *, int); 161 #else 162 #define Sendto sendto 163 #endif 164 165 int 166 main(int argc, char *argv[]) 167 { 168 struct pollfd pfd[1]; 169 char *ep, *cp; 170 int on = 1; 171 int send_time = 180; /* Default time, 180 seconds (3 minutes) */ 172 struct sockaddr_in m_sin; 173 uid_t unpriv_uid; 174 gid_t unpriv_gid; 175 long tmp; 176 time_t delta = 0; 177 struct timeval next, now; 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 && *(argv + 1)[0] != '-') { 188 /* Argument has been given */ 189 argv++, argc--; 190 multicast_mode = SCOPED_MULTICAST; 191 tmp = strtol(*argv, &ep, 10); 192 if (*ep != '\0' || tmp < INT_MIN || tmp > INT_MAX) 193 errx(1, "invalid ttl: %s", *argv); 194 multicast_scope = (int)tmp; 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 } else if (strcmp(*argv, "-g") == 0) { 201 if (argc > 1 && *(argv + 1)[0] != '-') { 202 argv++, argc--; 203 send_time = (int)strtol(*argv, &ep, 10); 204 if (send_time <= 0) 205 errx(1, "time must be greater than 0"); 206 207 if (ep[0] != '\0') { 208 if (ep[1] != '\0') 209 errx(1, "invalid argument: %s", *argv); 210 if (*ep == 'M' || *ep == 'm') { 211 /* Time in minutes. */ 212 send_time *= 60; 213 } else 214 errx(1, "invalid argument: %s", *argv); 215 } 216 217 if (send_time > 180) 218 errx(1, "cannot be greater than 180 seconds (3 minutes)"); 219 } else 220 errx(1, "missing argument"); 221 } else if (strcmp(*argv, "-i") == 0) 222 insecure_mode = 1; 223 else if (strcmp(*argv, "-l") == 0) 224 quiet_mode = 1; 225 else if (strcmp(*argv, "-p") == 0) 226 iff_flag = 0; 227 else 228 usage(); 229 argv++, argc--; 230 } 231 if (argc > 0) 232 usage(); 233 #ifndef DEBUG 234 daemon(1, 0); 235 pidfile(NULL); 236 #endif 237 signal(SIGHUP, hup); 238 openlog("rwhod", LOG_PID, LOG_DAEMON); 239 sp = getservbyname("who", "udp"); 240 if (sp == NULL) 241 quit("udp/who: unknown service", WITHOUT_ERRNO); 242 243 if (chdir(_PATH_RWHODIR) < 0) 244 quit(_PATH_RWHODIR, WITH_ERRNO); 245 246 /* 247 * Establish host name as returned by system. 248 */ 249 if (gethostname(myname, sizeof(myname)) < 0) 250 quit("gethostname", WITH_ERRNO); 251 252 if ((cp = strchr(myname, '.')) != NULL) 253 *cp = '\0'; 254 strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname)); 255 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 256 if (utmpf < 0) 257 quit(_PATH_UTMP, WITH_ERRNO); 258 259 getboottime(); 260 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 261 quit("socket", WITH_ERRNO); 262 263 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) 264 quit("setsockopt SO_BROADCAST", WITH_ERRNO); 265 266 memset(&m_sin, 0, sizeof(m_sin)); 267 m_sin.sin_len = sizeof(m_sin); 268 m_sin.sin_family = AF_INET; 269 m_sin.sin_port = sp->s_port; 270 if (bind(s, (struct sockaddr *)&m_sin, sizeof(m_sin)) < 0) 271 quit("bind", WITH_ERRNO); 272 273 setgid(unpriv_gid); 274 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 275 setuid(unpriv_uid); 276 if (!configure(s)) 277 exit(1); 278 279 if (!quiet_mode) { 280 send_host_information(); 281 delta = send_time; 282 gettimeofday(&now, NULL); 283 timeadd(&now, delta, &next); 284 } 285 286 pfd[0].fd = s; 287 pfd[0].events = POLLIN; 288 289 for (;;) { 290 int n; 291 292 n = poll(pfd, 1, 1000); 293 294 if (onsighup) { 295 onsighup = 0; 296 getboottime(); 297 } 298 299 if (n == 1) 300 handleread(s); 301 if (!quiet_mode) { 302 gettimeofday(&now, NULL); 303 if (now.tv_sec > next.tv_sec) { 304 send_host_information(); 305 timeadd(&now, delta, &next); 306 } 307 } 308 } 309 } 310 311 void 312 timeadd(struct timeval *now, time_t delta, struct timeval *next) 313 { 314 (next)->tv_sec = (now)->tv_sec + delta; 315 } 316 317 void 318 handleread(int sock) 319 { 320 struct sockaddr_in from; 321 struct stat st; 322 char path[64]; 323 struct whod wd; 324 int cc, whod; 325 socklen_t len = sizeof(from); 326 327 cc = recvfrom(sock, (char *)&wd, sizeof(struct whod), 0, 328 (struct sockaddr *)&from, &len); 329 if (cc == 0) 330 return; 331 332 if (cc < 0 && errno != EINTR) { 333 syslog(LOG_WARNING, "recv: %m"); 334 return; 335 } 336 337 if (from.sin_port != sp->s_port && !insecure_mode) { 338 syslog(LOG_WARNING, "%d: bad source port from %s", 339 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 340 return; 341 } 342 if (cc < (int)WHDRSIZE) { 343 syslog(LOG_WARNING, "short packet from %s", 344 inet_ntoa(from.sin_addr)); 345 return; 346 } 347 if (wd.wd_vers != WHODVERSION) 348 return; 349 if (wd.wd_type != WHODTYPE_STATUS) 350 return; 351 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 352 syslog(LOG_WARNING, "malformed host name from %s", 353 inet_ntoa(from.sin_addr)); 354 return; 355 } 356 snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 357 /* 358 * Rather than truncating and growing the file each time, 359 * use ftruncate if size is less than previous size. 360 */ 361 whod = open(path, O_WRONLY | O_CREAT, 0644); 362 if (whod < 0) { 363 syslog(LOG_WARNING, "%s: %m", path); 364 return; 365 } 366 #if ENDIAN != BIG_ENDIAN 367 { 368 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 369 struct whoent *we; 370 371 /* undo header byte swapping before writing to file */ 372 wd.wd_sendtime = ntohl(wd.wd_sendtime); 373 for (i = 0; i < 3; i++) 374 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 375 wd.wd_boottime = ntohl(wd.wd_boottime); 376 we = wd.wd_we; 377 for (i = 0; i < n; i++) { 378 we->we_idle = ntohl(we->we_idle); 379 we->we_utmp.out_time = 380 ntohl(we->we_utmp.out_time); 381 we++; 382 } 383 } 384 #endif 385 time((time_t *)&wd.wd_recvtime); 386 write(whod, (char *)&wd, cc); 387 if (fstat(whod, &st) < 0 || st.st_size > cc) 388 ftruncate(whod, cc); 389 close(whod); 390 } 391 392 static void 393 usage(void) 394 { 395 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 396 exit(1); 397 } 398 399 void 400 hup(int signo __unused) 401 { 402 onsighup = 1; 403 } 404 405 void 406 run_as(uid_t *uid, gid_t *gid) 407 { 408 struct passwd *pw; 409 struct group *gr; 410 411 pw = getpwnam(UNPRIV_USER); 412 if (!pw) 413 quit("getpwnam(daemon)", WITH_ERRNO); 414 415 *uid = pw->pw_uid; 416 417 gr = getgrnam(UNPRIV_GROUP); 418 if (!gr) 419 quit("getgrnam(daemon)", WITH_ERRNO); 420 421 *gid = gr->gr_gid; 422 } 423 424 /* 425 * Check out host name for unprintables 426 * and other funnies before allowing a file 427 * to be created. Sorry, but blanks aren't allowed. 428 */ 429 int 430 verify(char *name, int maxlen) 431 { 432 int size = 0; 433 434 while (*name && size < maxlen - 1) { 435 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 436 return (0); 437 name++, size++; 438 } 439 *name = '\0'; 440 return (size > 0); 441 } 442 443 int utmptime; 444 int utmpent; 445 int utmpsize; 446 struct utmp *utmp; 447 int alarmcount; 448 449 void 450 send_host_information(void) 451 { 452 struct neighbor *np; 453 struct whoent *we = mywd.wd_we, *wlast; 454 int i; 455 struct stat stb; 456 double avenrun[3]; 457 time_t now; 458 int cc; 459 460 now = time(NULL); 461 if (alarmcount % 10 == 0) 462 getboottime(); 463 alarmcount++; 464 fstat(utmpf, &stb); 465 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 466 utmptime = stb.st_mtime; 467 if (stb.st_size > utmpsize) { 468 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 469 utmp = reallocf(utmp, utmpsize); 470 if (utmp == NULL) { 471 syslog(LOG_WARNING, "malloc failed: %m"); 472 utmpsize = 0; 473 return; 474 } 475 } 476 lseek(utmpf, (off_t)0, L_SET); 477 cc = read(utmpf, (char *)utmp, stb.st_size); 478 if (cc < 0) { 479 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 480 return; 481 } 482 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 483 utmpent = cc / sizeof(struct utmp); 484 for (i = 0; i < utmpent; i++) 485 if (utmp[i].ut_name[0]) { 486 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 487 sizeof(utmp[i].ut_line)); 488 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 489 sizeof(utmp[i].ut_name)); 490 we->we_utmp.out_time = htonl(utmp[i].ut_time); 491 if (we >= wlast) 492 break; 493 we++; 494 } 495 utmpent = we - mywd.wd_we; 496 } 497 498 /* 499 * The test on utmpent looks silly---after all, if no one is 500 * logged on, why worry about efficiency?---but is useful on 501 * (e.g.) compute servers. 502 */ 503 if (utmpent && chdir(_PATH_DEV)) { 504 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 505 exit(1); 506 } 507 508 we = mywd.wd_we; 509 for (i = 0; i < utmpent; i++) { 510 if (stat(we->we_utmp.out_line, &stb) >= 0) 511 we->we_idle = htonl(now - stb.st_atime); 512 we++; 513 } 514 getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 515 for (i = 0; i < 3; i++) 516 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 517 cc = (char *)we - (char *)&mywd; 518 mywd.wd_sendtime = htonl(time(0)); 519 mywd.wd_vers = WHODVERSION; 520 mywd.wd_type = WHODTYPE_STATUS; 521 if (multicast_mode == SCOPED_MULTICAST) { 522 Sendto(s, (char *)&mywd, cc, 0, 523 (struct sockaddr *)&multicast_addr, 524 sizeof(multicast_addr)); 525 } 526 else for (np = neighbors; np != NULL; np = np->n_next) { 527 if (multicast_mode == PER_INTERFACE_MULTICAST && 528 np->n_flags & IFF_MULTICAST) { 529 /* 530 * Select the outgoing interface for the multicast. 531 */ 532 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 533 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 534 sizeof(struct in_addr)) < 0) { 535 quit("setsockopt IP_MULTICAST_IF", WITH_ERRNO); 536 } 537 Sendto(s, (char *)&mywd, cc, 0, 538 (struct sockaddr *)&multicast_addr, 539 sizeof(multicast_addr)); 540 } else Sendto(s, (char *)&mywd, cc, 0, 541 np->n_addr, np->n_addrlen); 542 } 543 if (utmpent && chdir(_PATH_RWHODIR)) { 544 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 545 exit(1); 546 } 547 } 548 549 void 550 getboottime(void) 551 { 552 int mib[2]; 553 size_t size; 554 struct timeval tm; 555 556 mib[0] = CTL_KERN; 557 mib[1] = KERN_BOOTTIME; 558 size = sizeof(tm); 559 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) 560 quit("cannot get boottime", WITH_ERRNO); 561 562 mywd.wd_boottime = htonl(tm.tv_sec); 563 } 564 565 /* 566 * If wrterrno == WITH_ERRNO, we will print 567 * errno. If not, we leave errno out. 568 */ 569 void 570 quit(const char *msg, int wrterrno) 571 { 572 if (wrterrno) 573 syslog(LOG_ERR, "%s: %m", msg); 574 else 575 syslog(LOG_ERR, "%s", msg); 576 exit(1); 577 } 578 579 #define ROUNDUP(a) \ 580 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 581 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 582 583 void 584 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 585 { 586 struct sockaddr *sa; 587 int i; 588 589 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 590 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 591 if ((rtinfo->rti_addrs & (1 << i)) == 0) 592 continue; 593 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 594 ADVANCE(cp, sa); 595 } 596 } 597 598 /* 599 * Figure out device configuration and select 600 * networks which deserve status information. 601 */ 602 int 603 configure(int c_sock) 604 { 605 struct neighbor *np; 606 struct if_msghdr *ifm; 607 struct ifa_msghdr *ifam; 608 struct sockaddr_dl *sdl; 609 size_t needed; 610 int mib[6], flags = 0, len; 611 char *buf, *lim, *next; 612 struct rt_addrinfo info; 613 614 if (multicast_mode != NO_MULTICAST) { 615 multicast_addr.sin_len = sizeof(multicast_addr); 616 multicast_addr.sin_family = AF_INET; 617 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 618 multicast_addr.sin_port = sp->s_port; 619 } 620 621 if (multicast_mode == SCOPED_MULTICAST) { 622 struct ip_mreq mreq; 623 unsigned char ttl; 624 625 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 626 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 627 if (setsockopt(c_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, 628 &mreq, sizeof(mreq)) < 0) { 629 syslog(LOG_ERR, 630 "setsockopt IP_ADD_MEMBERSHIP: %m"); 631 return(0); 632 } 633 ttl = multicast_scope; 634 if (setsockopt(c_sock, IPPROTO_IP, IP_MULTICAST_TTL, 635 &ttl, sizeof(ttl)) < 0) { 636 syslog(LOG_ERR, 637 "setsockopt IP_MULTICAST_TTL: %m"); 638 return(0); 639 } 640 return(1); 641 } 642 643 mib[0] = CTL_NET; 644 mib[1] = PF_ROUTE; 645 mib[2] = 0; 646 mib[3] = AF_INET; 647 mib[4] = NET_RT_IFLIST; 648 mib[5] = 0; 649 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 650 quit("route-sysctl-estimate", WITH_ERRNO); 651 if ((buf = malloc(needed)) == NULL) 652 quit("malloc", WITH_ERRNO); 653 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 654 quit("actual retrieval of interface table", WITH_ERRNO); 655 lim = buf + needed; 656 657 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 658 for (next = buf; next < lim; next += ifm->ifm_msglen) { 659 ifm = (struct if_msghdr *)next; 660 if (ifm->ifm_type == RTM_IFINFO) { 661 sdl = (struct sockaddr_dl *)(ifm + 1); 662 flags = ifm->ifm_flags; 663 continue; 664 } 665 if ((flags & IFF_UP) == 0 || 666 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 667 IFF_MULTICAST : 0) | 668 IFF_BROADCAST|iff_flag)) == 0) 669 continue; 670 if (ifm->ifm_type != RTM_NEWADDR) 671 quit("out of sync parsing NET_RT_IFLIST", WITHOUT_ERRNO); 672 ifam = (struct ifa_msghdr *)ifm; 673 info.rti_addrs = ifam->ifam_addrs; 674 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 675 &info); 676 /* gag, wish we could get rid of Internet dependencies */ 677 #define dstaddr info.rti_info[RTAX_BRD] 678 #define ifaddr info.rti_info[RTAX_IFA] 679 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 680 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 681 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 682 continue; 683 PORT_SA(dstaddr) = sp->s_port; 684 for (np = neighbors; np != NULL; np = np->n_next) 685 if (memcmp(sdl->sdl_data, np->n_name, 686 sdl->sdl_nlen) == 0 && 687 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 688 break; 689 if (np != NULL) 690 continue; 691 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 692 np = (struct neighbor *)malloc(len); 693 if (np == NULL) 694 quit("malloc of neighbor structure", WITH_ERRNO); 695 memset(np, 0, len); 696 np->n_flags = flags; 697 np->n_addr = (struct sockaddr *)(np + 1); 698 np->n_addrlen = dstaddr->sa_len; 699 np->n_name = np->n_addrlen + (char *)np->n_addr; 700 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 701 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 702 if (multicast_mode == PER_INTERFACE_MULTICAST && 703 (flags & IFF_MULTICAST) && 704 !(flags & IFF_LOOPBACK)) { 705 struct ip_mreq mreq; 706 707 memcpy((char *)np->n_addr, (char *)ifaddr, 708 np->n_addrlen); 709 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 710 mreq.imr_interface.s_addr = 711 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 712 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 713 &mreq, sizeof(mreq)) < 0) { 714 syslog(LOG_ERR, 715 "setsockopt IP_ADD_MEMBERSHIP: %m"); 716 #if 0 717 /* Fall back to broadcast on this if. */ 718 np->n_flags &= ~IFF_MULTICAST; 719 #else 720 free((char *)np); 721 continue; 722 #endif 723 } 724 } 725 np->n_next = neighbors; 726 neighbors = np; 727 } 728 free(buf); 729 return (1); 730 } 731 732 #ifdef DEBUG 733 ssize_t 734 Sendto(int s_debug, const void *buf, size_t cc, int flags, 735 const struct sockaddr *to, int tolen) 736 { 737 const struct whod *w = (const struct whod *)buf; 738 const struct whoent *we; 739 const struct sockaddr_in *sock_in = (const struct sockaddr_in *)to; 740 ssize_t ret; 741 int idle_time; 742 743 ret = sendto(s_debug, buf, cc, flags, to, tolen); 744 745 printf("sendto %s:%d\n", inet_ntoa(sock_in->sin_addr), 746 ntohs(sock_in->sin_port)); 747 printf("hostname %s %s\n", w->wd_hostname, 748 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 749 printf("load %4.2f, %4.2f, %4.2f\n", 750 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 751 ntohl(w->wd_loadav[2]) / 100.0); 752 cc -= WHDRSIZE; 753 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 754 time_t t = ntohl(we->we_utmp.out_time); 755 idle_time = we->we_idle; 756 printf("%-8.8s %s:%s %.12s", 757 we->we_utmp.out_name, 758 w->wd_hostname, we->we_utmp.out_line, 759 ctime(&t)+4); 760 idle_time = ntohl(we->we_idle) / 60; 761 if (idle_time) { 762 if (idle_time >= 100*60) 763 idle_time = 100*60 - 1; 764 if (idle_time >= 60) 765 printf(" %2d", idle_time / 60); 766 else 767 printf(" "); 768 printf(":%02d", idle_time % 60); 769 } 770 printf("\n"); 771 } 772 return(ret); 773 } 774 775 char * 776 interval(int inter_time, const char *updown) 777 { 778 static char resbuf[32]; 779 int days, hours, minutes; 780 781 if (inter_time < 0 || inter_time > 3*30*24*60*60) { 782 snprintf(resbuf, sizeof(resbuf), " %s ??:??", updown); 783 return (resbuf); 784 } 785 minutes = (inter_time + 59) / 60; /* round to minutes */ 786 hours = minutes / 60; minutes %= 60; 787 days = hours / 24; hours %= 24; 788 if (days) 789 snprintf(resbuf, sizeof(resbuf), "%s %2d+%02d:%02d", 790 updown, days, hours, minutes); 791 else 792 snprintf(resbuf, sizeof(resbuf), "%s %2d:%02d", 793 updown, hours, minutes); 794 return (resbuf); 795 } 796 #endif 797