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. 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 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)rwhod.c 8.1 (Berkeley) 6/6/93 31 * $FreeBSD: src/usr.sbin/rwhod/rwhod.c,v 1.13.2.2 2000/12/23 15:28:12 iedowse Exp $ 32 * $DragonFly: src/usr.sbin/rwhod/rwhod.c,v 1.24 2007/12/27 15:29:40 matthias Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/socket.h> 37 #include <sys/stat.h> 38 #include <sys/signal.h> 39 #include <sys/ioctl.h> 40 #include <sys/sysctl.h> 41 42 #include <net/if.h> 43 #include <net/if_dl.h> 44 #include <net/route.h> 45 #include <netinet/in.h> 46 #include <arpa/inet.h> 47 #include <protocols/rwhod.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <libutil.h> 54 #include <netdb.h> 55 #include <paths.h> 56 #include <poll.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <syslog.h> 61 #include <unistd.h> 62 #include <utmp.h> 63 #include <pwd.h> 64 #include <grp.h> 65 66 /* 67 * This version of Berkeley's rwhod has been modified to use IP multicast 68 * datagrams, under control of a new command-line option: 69 * 70 * rwhod -m causes rwhod to use IP multicast (instead of 71 * broadcast or unicast) on all interfaces that have 72 * the IFF_MULTICAST flag set in their "ifnet" structs 73 * (excluding the loopback interface). The multicast 74 * reports are sent with a time-to-live of 1, to prevent 75 * forwarding beyond the directly-connected subnet(s). 76 * 77 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 78 * time-to-live of <ttl>, via a SINGLE interface rather 79 * than all interfaces. <ttl> must be between 0 and 80 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 81 * is different than "-m", in that "-m 1" specifies 82 * transmission on one interface only. 83 * 84 * When "-m" is used without a <ttl> argument, the program accepts multicast 85 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 86 * is given, it accepts multicast reports from only one interface, the one 87 * on which reports are sent (which may be controlled via the host's routing 88 * table). Regardless of the "-m" option, the program accepts broadcast or 89 * unicast reports from all interfaces. Thus, this program will hear the 90 * reports of old, non-multicasting rwhods, but, if multicasting is used, 91 * those old rwhods won't hear the reports generated by this program. 92 * 93 * -- Steve Deering, Stanford University, February 1989 94 */ 95 96 #define UNPRIV_USER "daemon" 97 #define UNPRIV_GROUP "daemon" 98 99 #define WITH_ERRNO 1 /* Write to syslog with errno (%m) */ 100 #define WITHOUT_ERRNO 0 /* Write to syslog without errno */ 101 102 #define NO_MULTICAST 0 /* multicast modes */ 103 #define PER_INTERFACE_MULTICAST 1 104 #define SCOPED_MULTICAST 2 105 106 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 107 108 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 109 /* (belongs in protocols/rwhod.h) */ 110 111 int insecure_mode; 112 int quiet_mode; 113 int iff_flag = IFF_POINTOPOINT; 114 int multicast_mode = NO_MULTICAST; 115 int multicast_scope; 116 struct sockaddr_in multicast_addr; 117 118 char myname[MAXHOSTNAMELEN]; 119 120 /* 121 * We communicate with each neighbor in a list constructed at the time we're 122 * started up. Neighbors are currently directly connected via a hardware 123 * interface. 124 */ 125 struct neighbor { 126 struct neighbor *n_next; 127 char *n_name; /* interface name */ 128 struct sockaddr *n_addr; /* who to send to */ 129 int n_addrlen; /* size of address */ 130 int n_flags; /* should forward?, interface flags */ 131 }; 132 133 struct neighbor *neighbors; 134 struct whod mywd; 135 struct servent *sp; 136 int s, utmpf; 137 volatile sig_atomic_t onsighup; 138 139 #define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we)) 140 141 void run_as(uid_t *, gid_t *); 142 int configure(int); 143 void getboottime(void); 144 void send_host_information(void); 145 void hup(int); 146 void quit(const char *, int); 147 void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 148 int verify(char *, int); 149 void handleread(int); 150 static void usage(void); 151 void timeadd(struct timeval *, time_t, struct timeval *); 152 153 #ifdef DEBUG 154 char *interval(int, const char *); 155 ssize_t Sendto(int, const void *, size_t, int, 156 const struct sockaddr *, int); 157 #else 158 #define Sendto sendto 159 #endif 160 161 int 162 main(int argc, char *argv[]) 163 { 164 struct pollfd pfd[1]; 165 char *ep, *cp; 166 int on = 1; 167 int send_time = 180; /* Default time, 180 seconds (3 minutes) */ 168 struct sockaddr_in m_sin; 169 uid_t unpriv_uid; 170 gid_t unpriv_gid; 171 long tmp; 172 time_t delta = 0; 173 struct timeval next, now; 174 175 if (getuid()) 176 errx(1, "not super user"); 177 178 run_as(&unpriv_uid, &unpriv_gid); 179 180 argv++; argc--; 181 while (argc > 0 && *argv[0] == '-') { 182 if (strcmp(*argv, "-m") == 0) { 183 if (argc > 1 && *(argv + 1)[0] != '-') { 184 /* Argument has been given */ 185 argv++, argc--; 186 multicast_mode = SCOPED_MULTICAST; 187 tmp = strtol(*argv, &ep, 10); 188 if (*ep != '\0' || tmp < INT_MIN || tmp > INT_MAX) 189 errx(1, "invalid ttl: %s", *argv); 190 multicast_scope = (int)tmp; 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 } else if (strcmp(*argv, "-g") == 0) { 197 if (argc > 1 && *(argv + 1)[0] != '-') { 198 argv++, argc--; 199 send_time = (int)strtol(*argv, &ep, 10); 200 if (send_time <= 0) 201 errx(1, "time must be greater than 0"); 202 203 if (ep[0] != '\0') { 204 if (ep[1] != '\0') 205 errx(1, "invalid argument: %s", *argv); 206 if (*ep == 'M' || *ep == 'm') { 207 /* Time in minutes. */ 208 send_time *= 60; 209 } else 210 errx(1, "invalid argument: %s", *argv); 211 } 212 213 if (send_time > 180) 214 errx(1, "cannot be greater than 180 seconds (3 minutes)"); 215 } else 216 errx(1, "missing argument"); 217 } else if (strcmp(*argv, "-i") == 0) 218 insecure_mode = 1; 219 else if (strcmp(*argv, "-l") == 0) 220 quiet_mode = 1; 221 else if (strcmp(*argv, "-p") == 0) 222 iff_flag = 0; 223 else 224 usage(); 225 argv++, argc--; 226 } 227 if (argc > 0) 228 usage(); 229 #ifndef DEBUG 230 daemon(1, 0); 231 pidfile(NULL); 232 #endif 233 signal(SIGHUP, hup); 234 openlog("rwhod", LOG_PID, LOG_DAEMON); 235 sp = getservbyname("who", "udp"); 236 if (sp == NULL) 237 quit("udp/who: unknown service", WITHOUT_ERRNO); 238 239 if (chdir(_PATH_RWHODIR) < 0) 240 quit(_PATH_RWHODIR, WITH_ERRNO); 241 242 /* 243 * Establish host name as returned by system. 244 */ 245 if (gethostname(myname, sizeof(myname)) < 0) 246 quit("gethostname", WITH_ERRNO); 247 248 if ((cp = strchr(myname, '.')) != NULL) 249 *cp = '\0'; 250 strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname)); 251 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 252 if (utmpf < 0) 253 quit(_PATH_UTMP, WITH_ERRNO); 254 255 getboottime(); 256 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 257 quit("socket", WITH_ERRNO); 258 259 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) 260 quit("setsockopt SO_BROADCAST", WITH_ERRNO); 261 262 memset(&m_sin, 0, sizeof(m_sin)); 263 m_sin.sin_len = sizeof(m_sin); 264 m_sin.sin_family = AF_INET; 265 m_sin.sin_port = sp->s_port; 266 if (bind(s, (struct sockaddr *)&m_sin, sizeof(m_sin)) < 0) 267 quit("bind", WITH_ERRNO); 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); 274 275 if (!quiet_mode) { 276 send_host_information(); 277 delta = send_time; 278 gettimeofday(&now, NULL); 279 timeadd(&now, delta, &next); 280 } 281 282 pfd[0].fd = s; 283 pfd[0].events = POLLIN; 284 285 for (;;) { 286 int n; 287 288 n = poll(pfd, 1, 1000); 289 290 if (onsighup) { 291 onsighup = 0; 292 getboottime(); 293 } 294 295 if (n == 1) 296 handleread(s); 297 if (!quiet_mode) { 298 gettimeofday(&now, NULL); 299 if (now.tv_sec > next.tv_sec) { 300 send_host_information(); 301 timeadd(&now, delta, &next); 302 } 303 } 304 } 305 } 306 307 void 308 timeadd(struct timeval *now, time_t delta, struct timeval *next) 309 { 310 (next)->tv_sec = (now)->tv_sec + delta; 311 } 312 313 void 314 handleread(int sock) 315 { 316 struct sockaddr_in from; 317 struct stat st; 318 char path[64]; 319 struct whod wd; 320 int cc, whod; 321 socklen_t len = sizeof(from); 322 323 cc = recvfrom(sock, (char *)&wd, sizeof(struct whod), 0, 324 (struct sockaddr *)&from, &len); 325 if (cc == 0) 326 return; 327 328 if (cc < 0 && errno != EINTR) { 329 syslog(LOG_WARNING, "recv: %m"); 330 return; 331 } 332 333 if (from.sin_port != sp->s_port && !insecure_mode) { 334 syslog(LOG_WARNING, "%d: bad source port from %s", 335 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 336 return; 337 } 338 if (cc < (int)WHDRSIZE) { 339 syslog(LOG_WARNING, "short packet from %s", 340 inet_ntoa(from.sin_addr)); 341 return; 342 } 343 if (wd.wd_vers != WHODVERSION) 344 return; 345 if (wd.wd_type != WHODTYPE_STATUS) 346 return; 347 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 348 syslog(LOG_WARNING, "malformed host name from %s", 349 inet_ntoa(from.sin_addr)); 350 return; 351 } 352 snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 353 /* 354 * Rather than truncating and growing the file each time, 355 * use ftruncate if size is less than previous size. 356 */ 357 whod = open(path, O_WRONLY | O_CREAT, 0644); 358 if (whod < 0) { 359 syslog(LOG_WARNING, "%s: %m", path); 360 return; 361 } 362 #if ENDIAN != BIG_ENDIAN 363 { 364 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 365 struct whoent *we; 366 367 /* undo header byte swapping before writing to file */ 368 wd.wd_sendtime = ntohl(wd.wd_sendtime); 369 for (i = 0; i < 3; i++) 370 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 371 wd.wd_boottime = ntohl(wd.wd_boottime); 372 we = wd.wd_we; 373 for (i = 0; i < n; i++) { 374 we->we_idle = ntohl(we->we_idle); 375 we->we_utmp.out_time = 376 ntohl(we->we_utmp.out_time); 377 we++; 378 } 379 } 380 #endif 381 wd.wd_recvtime = time(NULL); 382 write(whod, (char *)&wd, cc); 383 if (fstat(whod, &st) < 0 || st.st_size > cc) 384 ftruncate(whod, cc); 385 close(whod); 386 } 387 388 static void 389 usage(void) 390 { 391 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 392 exit(1); 393 } 394 395 void 396 hup(int signo __unused) 397 { 398 onsighup = 1; 399 } 400 401 void 402 run_as(uid_t *uid, gid_t *gid) 403 { 404 struct passwd *pw; 405 struct group *gr; 406 407 pw = getpwnam(UNPRIV_USER); 408 if (!pw) 409 quit("getpwnam(daemon)", WITH_ERRNO); 410 411 *uid = pw->pw_uid; 412 413 gr = getgrnam(UNPRIV_GROUP); 414 if (!gr) 415 quit("getgrnam(daemon)", WITH_ERRNO); 416 417 *gid = gr->gr_gid; 418 } 419 420 /* 421 * Check out host name for unprintables 422 * and other funnies before allowing a file 423 * to be created. Sorry, but blanks aren't allowed. 424 */ 425 int 426 verify(char *name, int maxlen) 427 { 428 int size = 0; 429 430 while (*name && size < maxlen - 1) { 431 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 432 return (0); 433 name++, size++; 434 } 435 *name = '\0'; 436 return (size > 0); 437 } 438 439 int utmptime; 440 int utmpent; 441 int utmpsize; 442 struct utmp *utmp; 443 int alarmcount; 444 445 void 446 send_host_information(void) 447 { 448 struct neighbor *np; 449 struct whoent *we = mywd.wd_we, *wlast; 450 int i; 451 struct stat stb; 452 double avenrun[3]; 453 time_t now; 454 int cc; 455 456 now = time(NULL); 457 if (alarmcount % 10 == 0) 458 getboottime(); 459 alarmcount++; 460 fstat(utmpf, &stb); 461 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 462 utmptime = stb.st_mtime; 463 if (stb.st_size > utmpsize) { 464 utmpsize = stb.st_size + 10 * sizeof(struct utmp); 465 utmp = reallocf(utmp, utmpsize); 466 if (utmp == NULL) { 467 syslog(LOG_WARNING, "malloc failed: %m"); 468 utmpsize = 0; 469 return; 470 } 471 } 472 lseek(utmpf, (off_t)0, L_SET); 473 cc = read(utmpf, (char *)utmp, stb.st_size); 474 if (cc < 0) { 475 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 476 return; 477 } 478 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 479 utmpent = cc / sizeof(struct utmp); 480 for (i = 0; i < utmpent; i++) 481 if (utmp[i].ut_name[0]) { 482 memcpy(we->we_utmp.out_line, utmp[i].ut_line, 483 sizeof(utmp[i].ut_line)); 484 memcpy(we->we_utmp.out_name, utmp[i].ut_name, 485 sizeof(utmp[i].ut_name)); 486 we->we_utmp.out_time = htonl(utmp[i].ut_time); 487 if (we >= wlast) 488 break; 489 we++; 490 } 491 utmpent = we - mywd.wd_we; 492 } 493 494 /* 495 * The test on utmpent looks silly---after all, if no one is 496 * logged on, why worry about efficiency?---but is useful on 497 * (e.g.) compute servers. 498 */ 499 if (utmpent && chdir(_PATH_DEV)) { 500 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 501 exit(1); 502 } 503 504 we = mywd.wd_we; 505 for (i = 0; i < utmpent; i++) { 506 if (stat(we->we_utmp.out_line, &stb) >= 0) 507 we->we_idle = htonl(now - stb.st_atime); 508 we++; 509 } 510 getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 511 for (i = 0; i < 3; i++) 512 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 513 cc = (char *)we - (char *)&mywd; 514 mywd.wd_sendtime = htonl(time(0)); 515 mywd.wd_vers = WHODVERSION; 516 mywd.wd_type = WHODTYPE_STATUS; 517 if (multicast_mode == SCOPED_MULTICAST) { 518 Sendto(s, (char *)&mywd, cc, 0, 519 (struct sockaddr *)&multicast_addr, 520 sizeof(multicast_addr)); 521 } 522 else for (np = neighbors; np != NULL; np = np->n_next) { 523 if (multicast_mode == PER_INTERFACE_MULTICAST && 524 np->n_flags & IFF_MULTICAST) { 525 /* 526 * Select the outgoing interface for the multicast. 527 */ 528 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 529 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 530 sizeof(struct in_addr)) < 0) { 531 quit("setsockopt IP_MULTICAST_IF", WITH_ERRNO); 532 } 533 Sendto(s, (char *)&mywd, cc, 0, 534 (struct sockaddr *)&multicast_addr, 535 sizeof(multicast_addr)); 536 } else Sendto(s, (char *)&mywd, cc, 0, 537 np->n_addr, np->n_addrlen); 538 } 539 if (utmpent && chdir(_PATH_RWHODIR)) { 540 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 541 exit(1); 542 } 543 } 544 545 void 546 getboottime(void) 547 { 548 int mib[2]; 549 size_t size; 550 struct timeval tm; 551 552 mib[0] = CTL_KERN; 553 mib[1] = KERN_BOOTTIME; 554 size = sizeof(tm); 555 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) 556 quit("cannot get boottime", WITH_ERRNO); 557 558 mywd.wd_boottime = htonl(tm.tv_sec); 559 } 560 561 /* 562 * If wrterrno == WITH_ERRNO, we will print 563 * errno. If not, we leave errno out. 564 */ 565 void 566 quit(const char *msg, int wrterrno) 567 { 568 if (wrterrno) 569 syslog(LOG_ERR, "%s: %m", msg); 570 else 571 syslog(LOG_ERR, "%s", msg); 572 exit(1); 573 } 574 575 #define ROUNDUP(a) \ 576 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) 577 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) 578 579 void 580 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 581 { 582 struct sockaddr *sa; 583 int i; 584 585 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 586 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 587 if ((rtinfo->rti_addrs & (1 << i)) == 0) 588 continue; 589 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 590 ADVANCE(cp, sa); 591 } 592 } 593 594 /* 595 * Figure out device configuration and select 596 * networks which deserve status information. 597 */ 598 int 599 configure(int c_sock) 600 { 601 struct neighbor *np; 602 struct if_msghdr *ifm; 603 struct ifa_msghdr *ifam; 604 struct sockaddr_dl *sdl; 605 size_t needed; 606 int mib[6], flags = 0, len; 607 char *buf, *lim, *next; 608 struct rt_addrinfo info; 609 610 if (multicast_mode != NO_MULTICAST) { 611 multicast_addr.sin_len = sizeof(multicast_addr); 612 multicast_addr.sin_family = AF_INET; 613 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 614 multicast_addr.sin_port = sp->s_port; 615 } 616 617 if (multicast_mode == SCOPED_MULTICAST) { 618 struct ip_mreq mreq; 619 unsigned char ttl; 620 621 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 622 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 623 if (setsockopt(c_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, 624 &mreq, sizeof(mreq)) < 0) { 625 syslog(LOG_ERR, 626 "setsockopt IP_ADD_MEMBERSHIP: %m"); 627 return(0); 628 } 629 ttl = multicast_scope; 630 if (setsockopt(c_sock, IPPROTO_IP, IP_MULTICAST_TTL, 631 &ttl, sizeof(ttl)) < 0) { 632 syslog(LOG_ERR, 633 "setsockopt IP_MULTICAST_TTL: %m"); 634 return(0); 635 } 636 return(1); 637 } 638 639 mib[0] = CTL_NET; 640 mib[1] = PF_ROUTE; 641 mib[2] = 0; 642 mib[3] = AF_INET; 643 mib[4] = NET_RT_IFLIST; 644 mib[5] = 0; 645 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 646 quit("route-sysctl-estimate", WITH_ERRNO); 647 if ((buf = malloc(needed)) == NULL) 648 quit("malloc", WITH_ERRNO); 649 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 650 quit("actual retrieval of interface table", WITH_ERRNO); 651 lim = buf + needed; 652 653 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 654 for (next = buf; next < lim; next += ifm->ifm_msglen) { 655 ifm = (struct if_msghdr *)next; 656 if (ifm->ifm_type == RTM_IFINFO) { 657 sdl = (struct sockaddr_dl *)(ifm + 1); 658 flags = ifm->ifm_flags; 659 continue; 660 } 661 if ((flags & IFF_UP) == 0 || 662 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 663 IFF_MULTICAST : 0) | 664 IFF_BROADCAST|iff_flag)) == 0) 665 continue; 666 if (ifm->ifm_type != RTM_NEWADDR) 667 quit("out of sync parsing NET_RT_IFLIST", WITHOUT_ERRNO); 668 ifam = (struct ifa_msghdr *)ifm; 669 info.rti_addrs = ifam->ifam_addrs; 670 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 671 &info); 672 /* gag, wish we could get rid of Internet dependencies */ 673 #define dstaddr info.rti_info[RTAX_BRD] 674 #define ifaddr info.rti_info[RTAX_IFA] 675 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 676 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 677 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 678 continue; 679 PORT_SA(dstaddr) = sp->s_port; 680 for (np = neighbors; np != NULL; np = np->n_next) 681 if (memcmp(sdl->sdl_data, np->n_name, 682 sdl->sdl_nlen) == 0 && 683 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 684 break; 685 if (np != NULL) 686 continue; 687 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 688 np = (struct neighbor *)malloc(len); 689 if (np == NULL) 690 quit("malloc of neighbor structure", WITH_ERRNO); 691 memset(np, 0, len); 692 np->n_flags = flags; 693 np->n_addr = (struct sockaddr *)(np + 1); 694 np->n_addrlen = dstaddr->sa_len; 695 np->n_name = np->n_addrlen + (char *)np->n_addr; 696 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 697 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 698 if (multicast_mode == PER_INTERFACE_MULTICAST && 699 (flags & IFF_MULTICAST) && 700 !(flags & IFF_LOOPBACK)) { 701 struct ip_mreq mreq; 702 703 memcpy((char *)np->n_addr, (char *)ifaddr, 704 np->n_addrlen); 705 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 706 mreq.imr_interface.s_addr = 707 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 708 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 709 &mreq, sizeof(mreq)) < 0) { 710 syslog(LOG_ERR, 711 "setsockopt IP_ADD_MEMBERSHIP: %m"); 712 #if 0 713 /* Fall back to broadcast on this if. */ 714 np->n_flags &= ~IFF_MULTICAST; 715 #else 716 free((char *)np); 717 continue; 718 #endif 719 } 720 } 721 np->n_next = neighbors; 722 neighbors = np; 723 } 724 free(buf); 725 return (1); 726 } 727 728 #ifdef DEBUG 729 ssize_t 730 Sendto(int s_debug, const void *buf, size_t cc, int flags, 731 const struct sockaddr *to, int tolen) 732 { 733 const struct whod *w = (const struct whod *)buf; 734 const struct whoent *we; 735 const struct sockaddr_in *sock_in = (const struct sockaddr_in *)to; 736 ssize_t ret; 737 int idle_time; 738 739 ret = sendto(s_debug, buf, cc, flags, to, tolen); 740 741 printf("sendto %s:%d\n", inet_ntoa(sock_in->sin_addr), 742 ntohs(sock_in->sin_port)); 743 printf("hostname %s %s\n", w->wd_hostname, 744 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 745 printf("load %4.2f, %4.2f, %4.2f\n", 746 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 747 ntohl(w->wd_loadav[2]) / 100.0); 748 cc -= WHDRSIZE; 749 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 750 time_t t = ntohl(we->we_utmp.out_time); 751 idle_time = we->we_idle; 752 printf("%-8.8s %s:%s %.12s", 753 we->we_utmp.out_name, 754 w->wd_hostname, we->we_utmp.out_line, 755 ctime(&t)+4); 756 idle_time = ntohl(we->we_idle) / 60; 757 if (idle_time) { 758 if (idle_time >= 100*60) 759 idle_time = 100*60 - 1; 760 if (idle_time >= 60) 761 printf(" %2d", idle_time / 60); 762 else 763 printf(" "); 764 printf(":%02d", idle_time % 60); 765 } 766 printf("\n"); 767 } 768 return(ret); 769 } 770 771 char * 772 interval(int inter_time, const char *updown) 773 { 774 static char resbuf[32]; 775 int days, hours, minutes; 776 777 if (inter_time < 0 || inter_time > 3*30*24*60*60) { 778 snprintf(resbuf, sizeof(resbuf), " %s ??:??", updown); 779 return (resbuf); 780 } 781 minutes = (inter_time + 59) / 60; /* round to minutes */ 782 hours = minutes / 60; minutes %= 60; 783 days = hours / 24; hours %= 24; 784 if (days) 785 snprintf(resbuf, sizeof(resbuf), "%s %2d+%02d:%02d", 786 updown, days, hours, minutes); 787 else 788 snprintf(resbuf, sizeof(resbuf), "%s %2d:%02d", 789 updown, hours, minutes); 790 return (resbuf); 791 } 792 #endif 793