1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1993 The Regents of the University of California. 5 * Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1983, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #if 0 40 #endif 41 42 #include <sys/cdefs.h> 43 #include <sys/param.h> 44 #include <sys/capsicum.h> 45 #include <sys/ioctl.h> 46 #include <sys/procdesc.h> 47 #include <sys/socket.h> 48 #include <sys/stat.h> 49 #include <sys/signal.h> 50 #include <sys/sysctl.h> 51 #include <sys/wait.h> 52 53 #include <net/if.h> 54 #include <net/if_dl.h> 55 #include <net/route.h> 56 #include <netinet/in.h> 57 #include <arpa/inet.h> 58 #include <protocols/rwhod.h> 59 60 #include <ctype.h> 61 #include <capsicum_helpers.h> 62 #include <err.h> 63 #include <errno.h> 64 #include <fcntl.h> 65 #include <grp.h> 66 #include <netdb.h> 67 #include <paths.h> 68 #include <pwd.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <string.h> 72 #include <syslog.h> 73 #include <timeconv.h> 74 #include <utmpx.h> 75 #include <unistd.h> 76 77 #define UNPRIV_USER "daemon" 78 #define UNPRIV_GROUP "daemon" 79 80 #define NO_MULTICAST 0 /* multicast modes */ 81 #define PER_INTERFACE_MULTICAST 1 82 #define SCOPED_MULTICAST 2 83 84 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 85 86 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 87 /* (belongs in protocols/rwhod.h) */ 88 89 int insecure_mode; 90 int quiet_mode; 91 int iff_flag = IFF_POINTOPOINT; 92 int multicast_mode = NO_MULTICAST; 93 int multicast_scope; 94 struct sockaddr_in multicast_addr = 95 { sizeof(multicast_addr), AF_INET, 0, { 0 }, { 0 } }; 96 97 /* 98 * Sleep interval. Don't forget to change the down time check in ruptime 99 * if this is changed. 100 */ 101 #define SL_INTERVAL (3 * 60) 102 103 char myname[MAXHOSTNAMELEN]; 104 105 /* 106 * We communicate with each neighbor in a list constructed at the time we're 107 * started up. Neighbors are currently directly connected via a hardware 108 * interface. 109 */ 110 struct neighbor { 111 struct neighbor *n_next; 112 char *n_name; /* interface name */ 113 struct sockaddr *n_addr; /* who to send to */ 114 int n_addrlen; /* size of address */ 115 int n_flags; /* should forward?, interface flags */ 116 }; 117 118 struct neighbor *neighbors; 119 struct whod mywd; 120 struct servent *sp; 121 int s; 122 int fdp; 123 pid_t pid_child_receiver; 124 125 #define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 126 127 int configure(int so); 128 void getboottime(int signo __unused); 129 void receiver_process(void); 130 void rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo); 131 void run_as(uid_t *uid, gid_t *gid); 132 void quit(const char *msg); 133 void sender_process(void); 134 int verify(char *name, int maxlen); 135 static void usage(void) __dead2; 136 137 #ifdef DEBUG 138 char *interval(int time, char *updown); 139 void Sendto(int s, const void *buf, size_t cc, int flags, 140 const struct sockaddr *to, int tolen); 141 #define sendto Sendto 142 #endif 143 144 /* 145 * This version of Berkeley's rwhod has been modified to use IP multicast 146 * datagrams, under control of a new command-line option: 147 * 148 * rwhod -m causes rwhod to use IP multicast (instead of 149 * broadcast or unicast) on all interfaces that have 150 * the IFF_MULTICAST flag set in their "ifnet" structs 151 * (excluding the loopback interface). The multicast 152 * reports are sent with a time-to-live of 1, to prevent 153 * forwarding beyond the directly-connected subnet(s). 154 * 155 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 156 * time-to-live of <ttl>, via a SINGLE interface rather 157 * than all interfaces. <ttl> must be between 0 and 158 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 159 * is different than "-m", in that "-m 1" specifies 160 * transmission on one interface only. 161 * 162 * When "-m" is used without a <ttl> argument, the program accepts multicast 163 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 164 * is given, it accepts multicast reports from only one interface, the one 165 * on which reports are sent (which may be controlled via the host's routing 166 * table). Regardless of the "-m" option, the program accepts broadcast or 167 * unicast reports from all interfaces. Thus, this program will hear the 168 * reports of old, non-multicasting rwhods, but, if multicasting is used, 169 * those old rwhods won't hear the reports generated by this program. 170 * 171 * -- Steve Deering, Stanford University, February 1989 172 */ 173 int 174 main(int argc, char *argv[]) 175 { 176 int on; 177 char *cp; 178 struct sockaddr_in soin; 179 uid_t unpriv_uid; 180 gid_t unpriv_gid; 181 182 on = 1; 183 if (getuid()) 184 errx(1, "not super user"); 185 186 run_as(&unpriv_uid, &unpriv_gid); 187 188 argv++; 189 argc--; 190 while (argc > 0 && *argv[0] == '-') { 191 if (strcmp(*argv, "-m") == 0) { 192 if (argc > 1 && isdigit(*(argv + 1)[0])) { 193 argv++; 194 argc--; 195 multicast_mode = SCOPED_MULTICAST; 196 multicast_scope = atoi(*argv); 197 if (multicast_scope > MAX_MULTICAST_SCOPE) { 198 errx(1, "ttl must not exceed %u", 199 MAX_MULTICAST_SCOPE); 200 } 201 } else { 202 multicast_mode = PER_INTERFACE_MULTICAST; 203 } 204 } else if (strcmp(*argv, "-i") == 0) { 205 insecure_mode = 1; 206 } else if (strcmp(*argv, "-l") == 0) { 207 quiet_mode = 1; 208 } else if (strcmp(*argv, "-p") == 0) { 209 iff_flag = 0; 210 } else { 211 usage(); 212 } 213 argv++; 214 argc--; 215 } 216 if (argc > 0) 217 usage(); 218 #ifndef DEBUG 219 daemon(1, 0); 220 #endif 221 (void) signal(SIGHUP, getboottime); 222 openlog("rwhod", LOG_PID | LOG_NDELAY, LOG_DAEMON); 223 sp = getservbyname("who", "udp"); 224 if (sp == NULL) { 225 syslog(LOG_ERR, "who/udp: unknown service"); 226 exit(1); 227 } 228 if (chdir(_PATH_RWHODIR) < 0) { 229 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 230 exit(1); 231 } 232 /* 233 * Establish host name as returned by system. 234 */ 235 if (gethostname(myname, sizeof(myname) - 1) < 0) { 236 syslog(LOG_ERR, "gethostname: %m"); 237 exit(1); 238 } 239 if ((cp = strchr(myname, '.')) != NULL) 240 *cp = '\0'; 241 strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname)); 242 getboottime(0); 243 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 244 syslog(LOG_ERR, "socket: %m"); 245 exit(1); 246 } 247 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 248 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 249 exit(1); 250 } 251 memset(&soin, 0, sizeof(soin)); 252 soin.sin_len = sizeof(soin); 253 soin.sin_family = AF_INET; 254 soin.sin_port = sp->s_port; 255 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) { 256 syslog(LOG_ERR, "bind: %m"); 257 exit(1); 258 } 259 if (setgid(unpriv_gid) != 0) { 260 syslog(LOG_ERR, "setgid: %m"); 261 exit(1); 262 } 263 if (setgroups(1, &unpriv_gid) != 0) { /* XXX BOGUS groups[0] = egid */ 264 syslog(LOG_ERR, "setgroups: %m"); 265 exit(1); 266 } 267 if (setuid(unpriv_uid) != 0) { 268 syslog(LOG_ERR, "setuid: %m"); 269 exit(1); 270 } 271 if (!configure(s)) 272 exit(1); 273 if (!quiet_mode) { 274 pid_child_receiver = pdfork(&fdp, 0); 275 if (pid_child_receiver == 0) { 276 receiver_process(); 277 } else if (pid_child_receiver > 0) { 278 sender_process(); 279 } else if (pid_child_receiver == -1) { 280 if (errno == ENOSYS) { 281 syslog(LOG_ERR, 282 "The pdfork(2) system call is not available - kernel too old."); 283 } else { 284 syslog(LOG_ERR, "pdfork: %m"); 285 } 286 exit(1); 287 } 288 } else { 289 receiver_process(); 290 } 291 } 292 293 static void 294 usage(void) 295 { 296 297 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 298 exit(1); 299 } 300 301 void 302 run_as(uid_t *uid, gid_t *gid) 303 { 304 struct passwd *pw; 305 struct group *gr; 306 307 pw = getpwnam(UNPRIV_USER); 308 if (pw == NULL) { 309 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 310 exit(1); 311 } 312 *uid = pw->pw_uid; 313 314 gr = getgrnam(UNPRIV_GROUP); 315 if (gr == NULL) { 316 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 317 exit(1); 318 } 319 *gid = gr->gr_gid; 320 } 321 322 /* 323 * Check out host name for unprintables 324 * and other funnies before allowing a file 325 * to be created. Sorry, but blanks aren't allowed. 326 */ 327 int 328 verify(char *name, int maxlen) 329 { 330 int size; 331 332 size = 0; 333 while (*name != '\0' && size < maxlen - 1) { 334 if (!isascii((unsigned char)*name) || 335 !(isalnum((unsigned char)*name) || 336 ispunct((unsigned char)*name))) { 337 return (0); 338 } 339 name++; 340 size++; 341 } 342 *name = '\0'; 343 return (size > 0); 344 } 345 346 void 347 receiver_process(void) 348 { 349 struct sockaddr_in from; 350 struct stat st; 351 cap_rights_t rights; 352 char path[64]; 353 int dirfd; 354 struct whod wd; 355 socklen_t len; 356 int cc, whod; 357 time_t t; 358 359 len = sizeof(from); 360 dirfd = open(".", O_RDONLY | O_DIRECTORY); 361 if (dirfd < 0) { 362 syslog(LOG_WARNING, "%s: %m", _PATH_RWHODIR); 363 exit(1); 364 } 365 cap_rights_init(&rights, CAP_CREATE, CAP_FSTAT, CAP_FTRUNCATE, 366 CAP_LOOKUP, CAP_SEEK, CAP_WRITE); 367 if (caph_rights_limit(dirfd, &rights) < 0) { 368 syslog(LOG_WARNING, "cap_rights_limit: %m"); 369 exit(1); 370 } 371 if (caph_enter() < 0) { 372 syslog(LOG_ERR, "cap_enter: %m"); 373 exit(1); 374 } 375 for (;;) { 376 cc = recvfrom(s, &wd, sizeof(wd), 0, (struct sockaddr *)&from, 377 &len); 378 if (cc <= 0) { 379 if (cc < 0 && errno != EINTR) 380 syslog(LOG_WARNING, "recv: %m"); 381 continue; 382 } 383 if (from.sin_port != sp->s_port && !insecure_mode) { 384 syslog(LOG_WARNING, "%d: bad source port from %s", 385 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 386 continue; 387 } 388 if (cc < WHDRSIZE) { 389 syslog(LOG_WARNING, "short packet from %s", 390 inet_ntoa(from.sin_addr)); 391 continue; 392 } 393 if (wd.wd_vers != WHODVERSION) 394 continue; 395 if (wd.wd_type != WHODTYPE_STATUS) 396 continue; 397 if (!verify(wd.wd_hostname, sizeof(wd.wd_hostname))) { 398 syslog(LOG_WARNING, "malformed host name from %s", 399 inet_ntoa(from.sin_addr)); 400 continue; 401 } 402 (void) snprintf(path, sizeof(path), "whod.%s", wd.wd_hostname); 403 /* 404 * Rather than truncating and growing the file each time, 405 * use ftruncate if size is less than previous size. 406 */ 407 whod = openat(dirfd, path, O_WRONLY | O_CREAT, 0644); 408 if (whod < 0) { 409 syslog(LOG_WARNING, "%s: %m", path); 410 continue; 411 } 412 cap_rights_init(&rights, CAP_FSTAT, CAP_FTRUNCATE, CAP_WRITE); 413 if (caph_rights_limit(whod, &rights) < 0) { 414 syslog(LOG_WARNING, "cap_rights_limit: %m"); 415 exit(1); 416 } 417 #if ENDIAN != BIG_ENDIAN 418 { 419 struct whoent *we; 420 int i, n; 421 422 n = (cc - WHDRSIZE) / sizeof(struct whoent); 423 /* undo header byte swapping before writing to file */ 424 wd.wd_sendtime = ntohl(wd.wd_sendtime); 425 for (i = 0; i < 3; i++) 426 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 427 wd.wd_boottime = ntohl(wd.wd_boottime); 428 we = wd.wd_we; 429 for (i = 0; i < n; i++) { 430 we->we_idle = ntohl(we->we_idle); 431 we->we_utmp.out_time = 432 ntohl(we->we_utmp.out_time); 433 we++; 434 } 435 } 436 #endif 437 (void) time(&t); 438 wd.wd_recvtime = _time_to_int(t); 439 (void) write(whod, (char *)&wd, cc); 440 if (fstat(whod, &st) < 0 || st.st_size > cc) 441 ftruncate(whod, cc); 442 (void) close(whod); 443 } 444 (void) close(dirfd); 445 } 446 447 void 448 sender_process(void) 449 { 450 int sendcount; 451 double avenrun[3]; 452 time_t now; 453 int i, cc, status; 454 struct utmpx *ut; 455 struct stat stb; 456 struct neighbor *np; 457 struct whoent *we, *wend; 458 459 sendcount = 0; 460 for (;;) { 461 we = mywd.wd_we; 462 now = time(NULL); 463 if (sendcount % 10 == 0) 464 getboottime(0); 465 sendcount++; 466 wend = &mywd.wd_we[1024 / sizeof(struct whoent)]; 467 setutxent(); 468 while ((ut = getutxent()) != NULL && we < wend) { 469 if (ut->ut_type != USER_PROCESS) 470 continue; 471 strncpy(we->we_utmp.out_line, ut->ut_line, 472 sizeof(we->we_utmp.out_line)); 473 strncpy(we->we_utmp.out_name, ut->ut_user, 474 sizeof(we->we_utmp.out_name)); 475 we->we_utmp.out_time = 476 htonl(_time_to_time32(ut->ut_tv.tv_sec)); 477 we++; 478 } 479 endutxent(); 480 481 if (chdir(_PATH_DEV) < 0) { 482 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 483 exit(1); 484 } 485 wend = we; 486 for (we = mywd.wd_we; we < wend; we++) { 487 if (stat(we->we_utmp.out_line, &stb) >= 0) 488 we->we_idle = htonl(now - stb.st_atime); 489 } 490 (void) getloadavg(avenrun, 491 sizeof(avenrun) / sizeof(avenrun[0])); 492 for (i = 0; i < 3; i++) 493 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 494 cc = (char *)wend - (char *)&mywd; 495 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 496 mywd.wd_vers = WHODVERSION; 497 mywd.wd_type = WHODTYPE_STATUS; 498 if (multicast_mode == SCOPED_MULTICAST) { 499 (void) sendto(s, (char *)&mywd, cc, 0, 500 (struct sockaddr *)&multicast_addr, 501 sizeof(multicast_addr)); 502 } else { 503 for (np = neighbors; np != NULL; np = np->n_next) { 504 if (multicast_mode == PER_INTERFACE_MULTICAST && 505 (np->n_flags & IFF_MULTICAST) != 0) { 506 /* 507 * Select the outgoing interface for the 508 * multicast. 509 */ 510 if (setsockopt(s, IPPROTO_IP, 511 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 { 522 (void) sendto(s, (char *)&mywd, cc, 0, 523 np->n_addr, np->n_addrlen); 524 } 525 } 526 } 527 if (chdir(_PATH_RWHODIR) < 0) { 528 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 529 exit(1); 530 } 531 if (waitpid(pid_child_receiver, &status, WNOHANG) == 532 pid_child_receiver) { 533 break; 534 } 535 sleep(SL_INTERVAL); 536 } 537 } 538 539 void 540 getboottime(int signo __unused) 541 { 542 int mib[2]; 543 size_t size; 544 struct timeval tm; 545 546 mib[0] = CTL_KERN; 547 mib[1] = KERN_BOOTTIME; 548 size = sizeof(tm); 549 if (sysctl(mib, nitems(mib), &tm, &size, NULL, 0) == -1) { 550 syslog(LOG_ERR, "cannot get boottime: %m"); 551 exit(1); 552 } 553 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 554 } 555 556 void 557 quit(const char *msg) 558 { 559 560 syslog(LOG_ERR, "%s", msg); 561 exit(1); 562 } 563 564 void 565 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 566 { 567 struct sockaddr *sa; 568 int i; 569 570 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 571 for (i = 0; i < RTAX_MAX && cp < cplim; i++) { 572 if ((rtinfo->rti_addrs & (1 << i)) == 0) 573 continue; 574 sa = (struct sockaddr *)cp; 575 rtinfo->rti_info[i] = sa; 576 cp += SA_SIZE(sa); 577 } 578 } 579 580 /* 581 * Figure out device configuration and select 582 * networks which deserve status information. 583 */ 584 int 585 configure(int so) 586 { 587 struct neighbor *np; 588 struct if_msghdr *ifm; 589 struct ifa_msghdr *ifam; 590 struct sockaddr_dl *sdl; 591 size_t needed; 592 int mib[6], flags, lflags, len; 593 char *buf, *lim, *next; 594 struct rt_addrinfo info; 595 596 flags = 0; 597 if (multicast_mode != NO_MULTICAST) { 598 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 599 multicast_addr.sin_port = sp->s_port; 600 } 601 602 if (multicast_mode == SCOPED_MULTICAST) { 603 struct ip_mreq mreq; 604 unsigned char ttl; 605 606 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 607 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 608 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP, 609 &mreq, sizeof(mreq)) < 0) { 610 syslog(LOG_ERR, 611 "setsockopt IP_ADD_MEMBERSHIP: %m"); 612 return (0); 613 } 614 ttl = multicast_scope; 615 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, 616 sizeof(ttl)) < 0) { 617 syslog(LOG_ERR, 618 "setsockopt IP_MULTICAST_TTL: %m"); 619 return (0); 620 } 621 return (1); 622 } 623 624 mib[0] = CTL_NET; 625 mib[1] = PF_ROUTE; 626 mib[2] = 0; 627 mib[3] = AF_INET; 628 mib[4] = NET_RT_IFLIST; 629 mib[5] = 0; 630 if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0) 631 quit("route-sysctl-estimate"); 632 if ((buf = malloc(needed)) == NULL) 633 quit("malloc"); 634 if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) 635 quit("actual retrieval of interface table"); 636 lim = buf + needed; 637 638 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 639 for (next = buf; next < lim; next += ifm->ifm_msglen) { 640 ifm = (struct if_msghdr *)next; 641 if (ifm->ifm_type == RTM_IFINFO) { 642 sdl = (struct sockaddr_dl *)(ifm + 1); 643 flags = ifm->ifm_flags; 644 continue; 645 } 646 if ((flags & IFF_UP) == 0) 647 continue; 648 lflags = IFF_BROADCAST | iff_flag; 649 if (multicast_mode == PER_INTERFACE_MULTICAST) 650 lflags |= IFF_MULTICAST; 651 if ((flags & lflags) == 0) 652 continue; 653 if (ifm->ifm_type != RTM_NEWADDR) 654 quit("out of sync parsing NET_RT_IFLIST"); 655 ifam = (struct ifa_msghdr *)ifm; 656 info.rti_addrs = ifam->ifam_addrs; 657 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 658 &info); 659 /* gag, wish we could get rid of Internet dependencies */ 660 #define dstaddr info.rti_info[RTAX_BRD] 661 #define ifaddr info.rti_info[RTAX_IFA] 662 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 663 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 664 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 665 continue; 666 PORT_SA(dstaddr) = sp->s_port; 667 for (np = neighbors; np != NULL; np = np->n_next) { 668 if (memcmp(sdl->sdl_data, np->n_name, 669 sdl->sdl_nlen) == 0 && 670 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) { 671 break; 672 } 673 } 674 if (np != NULL) 675 continue; 676 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 677 np = malloc(len); 678 if (np == NULL) 679 quit("malloc of neighbor structure"); 680 memset(np, 0, len); 681 np->n_flags = flags; 682 np->n_addr = (struct sockaddr *)(np + 1); 683 np->n_addrlen = dstaddr->sa_len; 684 np->n_name = np->n_addrlen + (char *)np->n_addr; 685 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 686 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 687 if (multicast_mode == PER_INTERFACE_MULTICAST && 688 (flags & IFF_MULTICAST) != 0 && 689 (flags & IFF_LOOPBACK) == 0) { 690 struct ip_mreq mreq; 691 692 memcpy((char *)np->n_addr, (char *)ifaddr, 693 np->n_addrlen); 694 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 695 mreq.imr_interface.s_addr = 696 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 697 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 698 &mreq, sizeof(mreq)) < 0) { 699 syslog(LOG_ERR, 700 "setsockopt IP_ADD_MEMBERSHIP: %m"); 701 #if 0 702 /* Fall back to broadcast on this if. */ 703 np->n_flags &= ~IFF_MULTICAST; 704 #else 705 free(np); 706 continue; 707 #endif 708 } 709 } 710 np->n_next = neighbors; 711 neighbors = np; 712 } 713 free(buf); 714 return (1); 715 } 716 717 #ifdef DEBUG 718 void 719 Sendto(int s, const void *buf, size_t cc, int flags, const struct sockaddr *to, 720 int tolen) 721 { 722 struct whod *w; 723 struct whoent *we; 724 struct sockaddr_in *sin; 725 726 w = (struct whod *)buf; 727 sin = (struct sockaddr_in *)to; 728 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 729 ntohs(sin->sin_port)); 730 printf("hostname %s %s\n", w->wd_hostname, 731 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 732 printf("load %4.2f, %4.2f, %4.2f\n", 733 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 734 ntohl(w->wd_loadav[2]) / 100.0); 735 cc -= WHDRSIZE; 736 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 737 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time)); 738 739 printf("%-8.8s %s:%s %.12s", we->we_utmp.out_name, 740 w->wd_hostname, we->we_utmp.out_line, ctime(&t) + 4); 741 we->we_idle = ntohl(we->we_idle) / 60; 742 if (we->we_idle != 0) { 743 if (we->we_idle >= 100 * 60) 744 we->we_idle = 100 * 60 - 1; 745 if (we->we_idle >= 60) 746 printf(" %2d", we->we_idle / 60); 747 else 748 printf(" "); 749 printf(":%02d", we->we_idle % 60); 750 } 751 printf("\n"); 752 } 753 } 754 755 char * 756 interval(int time, char *updown) 757 { 758 static char resbuf[32]; 759 int days, hours, minutes; 760 761 if (time < 0 || time > 3 * 30 * 24 * 60 * 60) { 762 (void) sprintf(resbuf, " %s ??:??", updown); 763 return (resbuf); 764 } 765 minutes = (time + 59) / 60; /* round to minutes */ 766 hours = minutes / 60; 767 minutes %= 60; 768 days = hours / 24; 769 hours %= 24; 770 if (days > 0) { 771 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 772 updown, days, hours, minutes); 773 } else { 774 (void) sprintf(resbuf, "%s %2d:%02d", 775 updown, hours, minutes); 776 } 777 return (resbuf); 778 } 779 #endif 780