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 #ifndef lint 41 static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; 42 #endif /* not lint */ 43 #endif 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <sys/param.h> 49 #include <sys/capsicum.h> 50 #include <sys/ioctl.h> 51 #include <sys/procdesc.h> 52 #include <sys/socket.h> 53 #include <sys/stat.h> 54 #include <sys/signal.h> 55 #include <sys/sysctl.h> 56 #include <sys/wait.h> 57 58 #include <net/if.h> 59 #include <net/if_dl.h> 60 #include <net/route.h> 61 #include <netinet/in.h> 62 #include <arpa/inet.h> 63 #include <protocols/rwhod.h> 64 65 #include <ctype.h> 66 #include <capsicum_helpers.h> 67 #include <err.h> 68 #include <errno.h> 69 #include <fcntl.h> 70 #include <grp.h> 71 #include <netdb.h> 72 #include <paths.h> 73 #include <pwd.h> 74 #include <stdio.h> 75 #include <stdlib.h> 76 #include <string.h> 77 #include <syslog.h> 78 #include <timeconv.h> 79 #include <utmpx.h> 80 #include <unistd.h> 81 82 #define UNPRIV_USER "daemon" 83 #define UNPRIV_GROUP "daemon" 84 85 #define NO_MULTICAST 0 /* multicast modes */ 86 #define PER_INTERFACE_MULTICAST 1 87 #define SCOPED_MULTICAST 2 88 89 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 90 91 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 92 /* (belongs in protocols/rwhod.h) */ 93 94 int insecure_mode; 95 int quiet_mode; 96 int iff_flag = IFF_POINTOPOINT; 97 int multicast_mode = NO_MULTICAST; 98 int multicast_scope; 99 struct sockaddr_in multicast_addr = 100 { sizeof(multicast_addr), AF_INET, 0, { 0 }, { 0 } }; 101 102 /* 103 * Sleep interval. Don't forget to change the down time check in ruptime 104 * if this is changed. 105 */ 106 #define SL_INTERVAL (3 * 60) 107 108 char myname[MAXHOSTNAMELEN]; 109 110 /* 111 * We communicate with each neighbor in a list constructed at the time we're 112 * started up. Neighbors are currently directly connected via a hardware 113 * interface. 114 */ 115 struct neighbor { 116 struct neighbor *n_next; 117 char *n_name; /* interface name */ 118 struct sockaddr *n_addr; /* who to send to */ 119 int n_addrlen; /* size of address */ 120 int n_flags; /* should forward?, interface flags */ 121 }; 122 123 struct neighbor *neighbors; 124 struct whod mywd; 125 struct servent *sp; 126 int s; 127 int fdp; 128 pid_t pid_child_receiver; 129 130 #define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 131 132 int configure(int so); 133 void getboottime(int signo __unused); 134 void receiver_process(void); 135 void rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo); 136 void run_as(uid_t *uid, gid_t *gid); 137 void quit(const char *msg); 138 void sender_process(void); 139 int verify(char *name, int maxlen); 140 static void usage(void) __dead2; 141 142 #ifdef DEBUG 143 char *interval(int time, char *updown); 144 void Sendto(int s, const void *buf, size_t cc, int flags, 145 const struct sockaddr *to, int tolen); 146 #define sendto Sendto 147 #endif 148 149 /* 150 * This version of Berkeley's rwhod has been modified to use IP multicast 151 * datagrams, under control of a new command-line option: 152 * 153 * rwhod -m causes rwhod to use IP multicast (instead of 154 * broadcast or unicast) on all interfaces that have 155 * the IFF_MULTICAST flag set in their "ifnet" structs 156 * (excluding the loopback interface). The multicast 157 * reports are sent with a time-to-live of 1, to prevent 158 * forwarding beyond the directly-connected subnet(s). 159 * 160 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 161 * time-to-live of <ttl>, via a SINGLE interface rather 162 * than all interfaces. <ttl> must be between 0 and 163 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 164 * is different than "-m", in that "-m 1" specifies 165 * transmission on one interface only. 166 * 167 * When "-m" is used without a <ttl> argument, the program accepts multicast 168 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 169 * is given, it accepts multicast reports from only one interface, the one 170 * on which reports are sent (which may be controlled via the host's routing 171 * table). Regardless of the "-m" option, the program accepts broadcast or 172 * unicast reports from all interfaces. Thus, this program will hear the 173 * reports of old, non-multicasting rwhods, but, if multicasting is used, 174 * those old rwhods won't hear the reports generated by this program. 175 * 176 * -- Steve Deering, Stanford University, February 1989 177 */ 178 int 179 main(int argc, char *argv[]) 180 { 181 int on; 182 char *cp; 183 struct sockaddr_in soin; 184 uid_t unpriv_uid; 185 gid_t unpriv_gid; 186 187 on = 1; 188 if (getuid()) 189 errx(1, "not super user"); 190 191 run_as(&unpriv_uid, &unpriv_gid); 192 193 argv++; 194 argc--; 195 while (argc > 0 && *argv[0] == '-') { 196 if (strcmp(*argv, "-m") == 0) { 197 if (argc > 1 && isdigit(*(argv + 1)[0])) { 198 argv++; 199 argc--; 200 multicast_mode = SCOPED_MULTICAST; 201 multicast_scope = atoi(*argv); 202 if (multicast_scope > MAX_MULTICAST_SCOPE) { 203 errx(1, "ttl must not exceed %u", 204 MAX_MULTICAST_SCOPE); 205 } 206 } else { 207 multicast_mode = PER_INTERFACE_MULTICAST; 208 } 209 } else if (strcmp(*argv, "-i") == 0) { 210 insecure_mode = 1; 211 } else if (strcmp(*argv, "-l") == 0) { 212 quiet_mode = 1; 213 } else if (strcmp(*argv, "-p") == 0) { 214 iff_flag = 0; 215 } else { 216 usage(); 217 } 218 argv++; 219 argc--; 220 } 221 if (argc > 0) 222 usage(); 223 #ifndef DEBUG 224 daemon(1, 0); 225 #endif 226 (void) signal(SIGHUP, getboottime); 227 openlog("rwhod", LOG_PID | LOG_NDELAY, LOG_DAEMON); 228 sp = getservbyname("who", "udp"); 229 if (sp == NULL) { 230 syslog(LOG_ERR, "who/udp: unknown service"); 231 exit(1); 232 } 233 if (chdir(_PATH_RWHODIR) < 0) { 234 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 235 exit(1); 236 } 237 /* 238 * Establish host name as returned by system. 239 */ 240 if (gethostname(myname, sizeof(myname) - 1) < 0) { 241 syslog(LOG_ERR, "gethostname: %m"); 242 exit(1); 243 } 244 if ((cp = strchr(myname, '.')) != NULL) 245 *cp = '\0'; 246 strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname)); 247 getboottime(0); 248 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 249 syslog(LOG_ERR, "socket: %m"); 250 exit(1); 251 } 252 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 253 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 254 exit(1); 255 } 256 memset(&soin, 0, sizeof(soin)); 257 soin.sin_len = sizeof(soin); 258 soin.sin_family = AF_INET; 259 soin.sin_port = sp->s_port; 260 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) { 261 syslog(LOG_ERR, "bind: %m"); 262 exit(1); 263 } 264 if (setgid(unpriv_gid) != 0) { 265 syslog(LOG_ERR, "setgid: %m"); 266 exit(1); 267 } 268 if (setgroups(1, &unpriv_gid) != 0) { /* XXX BOGUS groups[0] = egid */ 269 syslog(LOG_ERR, "setgroups: %m"); 270 exit(1); 271 } 272 if (setuid(unpriv_uid) != 0) { 273 syslog(LOG_ERR, "setuid: %m"); 274 exit(1); 275 } 276 if (!configure(s)) 277 exit(1); 278 if (!quiet_mode) { 279 pid_child_receiver = pdfork(&fdp, 0); 280 if (pid_child_receiver == 0) { 281 receiver_process(); 282 } else if (pid_child_receiver > 0) { 283 sender_process(); 284 } else if (pid_child_receiver == -1) { 285 if (errno == ENOSYS) { 286 syslog(LOG_ERR, 287 "The pdfork(2) system call is not available - kernel too old."); 288 } else { 289 syslog(LOG_ERR, "pdfork: %m"); 290 } 291 exit(1); 292 } 293 } else { 294 receiver_process(); 295 } 296 } 297 298 static void 299 usage(void) 300 { 301 302 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 303 exit(1); 304 } 305 306 void 307 run_as(uid_t *uid, gid_t *gid) 308 { 309 struct passwd *pw; 310 struct group *gr; 311 312 pw = getpwnam(UNPRIV_USER); 313 if (pw == NULL) { 314 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 315 exit(1); 316 } 317 *uid = pw->pw_uid; 318 319 gr = getgrnam(UNPRIV_GROUP); 320 if (gr == NULL) { 321 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 322 exit(1); 323 } 324 *gid = gr->gr_gid; 325 } 326 327 /* 328 * Check out host name for unprintables 329 * and other funnies before allowing a file 330 * to be created. Sorry, but blanks aren't allowed. 331 */ 332 int 333 verify(char *name, int maxlen) 334 { 335 int size; 336 337 size = 0; 338 while (*name != '\0' && size < maxlen - 1) { 339 if (!isascii((unsigned char)*name) || 340 !(isalnum((unsigned char)*name) || 341 ispunct((unsigned char)*name))) { 342 return (0); 343 } 344 name++; 345 size++; 346 } 347 *name = '\0'; 348 return (size > 0); 349 } 350 351 void 352 receiver_process(void) 353 { 354 struct sockaddr_in from; 355 struct stat st; 356 cap_rights_t rights; 357 char path[64]; 358 int dirfd; 359 struct whod wd; 360 socklen_t len; 361 int cc, whod; 362 time_t t; 363 364 len = sizeof(from); 365 dirfd = open(".", O_RDONLY | O_DIRECTORY); 366 if (dirfd < 0) { 367 syslog(LOG_WARNING, "%s: %m", _PATH_RWHODIR); 368 exit(1); 369 } 370 cap_rights_init(&rights, CAP_CREATE, CAP_FSTAT, CAP_FTRUNCATE, 371 CAP_LOOKUP, CAP_SEEK, CAP_WRITE); 372 if (caph_rights_limit(dirfd, &rights) < 0) { 373 syslog(LOG_WARNING, "cap_rights_limit: %m"); 374 exit(1); 375 } 376 if (caph_enter() < 0) { 377 syslog(LOG_ERR, "cap_enter: %m"); 378 exit(1); 379 } 380 for (;;) { 381 cc = recvfrom(s, &wd, sizeof(wd), 0, (struct sockaddr *)&from, 382 &len); 383 if (cc <= 0) { 384 if (cc < 0 && errno != EINTR) 385 syslog(LOG_WARNING, "recv: %m"); 386 continue; 387 } 388 if (from.sin_port != sp->s_port && !insecure_mode) { 389 syslog(LOG_WARNING, "%d: bad source port from %s", 390 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 391 continue; 392 } 393 if (cc < WHDRSIZE) { 394 syslog(LOG_WARNING, "short packet from %s", 395 inet_ntoa(from.sin_addr)); 396 continue; 397 } 398 if (wd.wd_vers != WHODVERSION) 399 continue; 400 if (wd.wd_type != WHODTYPE_STATUS) 401 continue; 402 if (!verify(wd.wd_hostname, sizeof(wd.wd_hostname))) { 403 syslog(LOG_WARNING, "malformed host name from %s", 404 inet_ntoa(from.sin_addr)); 405 continue; 406 } 407 (void) snprintf(path, sizeof(path), "whod.%s", wd.wd_hostname); 408 /* 409 * Rather than truncating and growing the file each time, 410 * use ftruncate if size is less than previous size. 411 */ 412 whod = openat(dirfd, path, O_WRONLY | O_CREAT, 0644); 413 if (whod < 0) { 414 syslog(LOG_WARNING, "%s: %m", path); 415 continue; 416 } 417 cap_rights_init(&rights, CAP_FSTAT, CAP_FTRUNCATE, CAP_WRITE); 418 if (caph_rights_limit(whod, &rights) < 0) { 419 syslog(LOG_WARNING, "cap_rights_limit: %m"); 420 exit(1); 421 } 422 #if ENDIAN != BIG_ENDIAN 423 { 424 struct whoent *we; 425 int i, n; 426 427 n = (cc - WHDRSIZE) / sizeof(struct whoent); 428 /* undo header byte swapping before writing to file */ 429 wd.wd_sendtime = ntohl(wd.wd_sendtime); 430 for (i = 0; i < 3; i++) 431 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 432 wd.wd_boottime = ntohl(wd.wd_boottime); 433 we = wd.wd_we; 434 for (i = 0; i < n; i++) { 435 we->we_idle = ntohl(we->we_idle); 436 we->we_utmp.out_time = 437 ntohl(we->we_utmp.out_time); 438 we++; 439 } 440 } 441 #endif 442 (void) time(&t); 443 wd.wd_recvtime = _time_to_int(t); 444 (void) write(whod, (char *)&wd, cc); 445 if (fstat(whod, &st) < 0 || st.st_size > cc) 446 ftruncate(whod, cc); 447 (void) close(whod); 448 } 449 (void) close(dirfd); 450 } 451 452 void 453 sender_process(void) 454 { 455 int sendcount; 456 double avenrun[3]; 457 time_t now; 458 int i, cc, status; 459 struct utmpx *ut; 460 struct stat stb; 461 struct neighbor *np; 462 struct whoent *we, *wend; 463 464 sendcount = 0; 465 for (;;) { 466 we = mywd.wd_we; 467 now = time(NULL); 468 if (sendcount % 10 == 0) 469 getboottime(0); 470 sendcount++; 471 wend = &mywd.wd_we[1024 / sizeof(struct whoent)]; 472 setutxent(); 473 while ((ut = getutxent()) != NULL && we < wend) { 474 if (ut->ut_type != USER_PROCESS) 475 continue; 476 strncpy(we->we_utmp.out_line, ut->ut_line, 477 sizeof(we->we_utmp.out_line)); 478 strncpy(we->we_utmp.out_name, ut->ut_user, 479 sizeof(we->we_utmp.out_name)); 480 we->we_utmp.out_time = 481 htonl(_time_to_time32(ut->ut_tv.tv_sec)); 482 we++; 483 } 484 endutxent(); 485 486 if (chdir(_PATH_DEV) < 0) { 487 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 488 exit(1); 489 } 490 wend = we; 491 for (we = mywd.wd_we; we < wend; we++) { 492 if (stat(we->we_utmp.out_line, &stb) >= 0) 493 we->we_idle = htonl(now - stb.st_atime); 494 } 495 (void) getloadavg(avenrun, 496 sizeof(avenrun) / sizeof(avenrun[0])); 497 for (i = 0; i < 3; i++) 498 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 499 cc = (char *)wend - (char *)&mywd; 500 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 501 mywd.wd_vers = WHODVERSION; 502 mywd.wd_type = WHODTYPE_STATUS; 503 if (multicast_mode == SCOPED_MULTICAST) { 504 (void) sendto(s, (char *)&mywd, cc, 0, 505 (struct sockaddr *)&multicast_addr, 506 sizeof(multicast_addr)); 507 } else { 508 for (np = neighbors; np != NULL; np = np->n_next) { 509 if (multicast_mode == PER_INTERFACE_MULTICAST && 510 (np->n_flags & IFF_MULTICAST) != 0) { 511 /* 512 * Select the outgoing interface for the 513 * multicast. 514 */ 515 if (setsockopt(s, IPPROTO_IP, 516 IP_MULTICAST_IF, 517 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 518 sizeof(struct in_addr)) < 0) { 519 syslog(LOG_ERR, 520 "setsockopt IP_MULTICAST_IF: %m"); 521 exit(1); 522 } 523 (void) sendto(s, (char *)&mywd, cc, 0, 524 (struct sockaddr *)&multicast_addr, 525 sizeof(multicast_addr)); 526 } else { 527 (void) sendto(s, (char *)&mywd, cc, 0, 528 np->n_addr, np->n_addrlen); 529 } 530 } 531 } 532 if (chdir(_PATH_RWHODIR) < 0) { 533 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 534 exit(1); 535 } 536 if (waitpid(pid_child_receiver, &status, WNOHANG) == 537 pid_child_receiver) { 538 break; 539 } 540 sleep(SL_INTERVAL); 541 } 542 } 543 544 void 545 getboottime(int signo __unused) 546 { 547 int mib[2]; 548 size_t size; 549 struct timeval tm; 550 551 mib[0] = CTL_KERN; 552 mib[1] = KERN_BOOTTIME; 553 size = sizeof(tm); 554 if (sysctl(mib, nitems(mib), &tm, &size, NULL, 0) == -1) { 555 syslog(LOG_ERR, "cannot get boottime: %m"); 556 exit(1); 557 } 558 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 559 } 560 561 void 562 quit(const char *msg) 563 { 564 565 syslog(LOG_ERR, "%s", msg); 566 exit(1); 567 } 568 569 void 570 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 571 { 572 struct sockaddr *sa; 573 int i; 574 575 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 576 for (i = 0; i < RTAX_MAX && cp < cplim; i++) { 577 if ((rtinfo->rti_addrs & (1 << i)) == 0) 578 continue; 579 sa = (struct sockaddr *)cp; 580 rtinfo->rti_info[i] = sa; 581 cp += SA_SIZE(sa); 582 } 583 } 584 585 /* 586 * Figure out device configuration and select 587 * networks which deserve status information. 588 */ 589 int 590 configure(int so) 591 { 592 struct neighbor *np; 593 struct if_msghdr *ifm; 594 struct ifa_msghdr *ifam; 595 struct sockaddr_dl *sdl; 596 size_t needed; 597 int mib[6], flags, lflags, len; 598 char *buf, *lim, *next; 599 struct rt_addrinfo info; 600 601 flags = 0; 602 if (multicast_mode != NO_MULTICAST) { 603 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 604 multicast_addr.sin_port = sp->s_port; 605 } 606 607 if (multicast_mode == SCOPED_MULTICAST) { 608 struct ip_mreq mreq; 609 unsigned char ttl; 610 611 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 612 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 613 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP, 614 &mreq, sizeof(mreq)) < 0) { 615 syslog(LOG_ERR, 616 "setsockopt IP_ADD_MEMBERSHIP: %m"); 617 return (0); 618 } 619 ttl = multicast_scope; 620 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, 621 sizeof(ttl)) < 0) { 622 syslog(LOG_ERR, 623 "setsockopt IP_MULTICAST_TTL: %m"); 624 return (0); 625 } 626 return (1); 627 } 628 629 mib[0] = CTL_NET; 630 mib[1] = PF_ROUTE; 631 mib[2] = 0; 632 mib[3] = AF_INET; 633 mib[4] = NET_RT_IFLIST; 634 mib[5] = 0; 635 if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0) 636 quit("route-sysctl-estimate"); 637 if ((buf = malloc(needed)) == NULL) 638 quit("malloc"); 639 if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) 640 quit("actual retrieval of interface table"); 641 lim = buf + needed; 642 643 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 644 for (next = buf; next < lim; next += ifm->ifm_msglen) { 645 ifm = (struct if_msghdr *)next; 646 if (ifm->ifm_type == RTM_IFINFO) { 647 sdl = (struct sockaddr_dl *)(ifm + 1); 648 flags = ifm->ifm_flags; 649 continue; 650 } 651 if ((flags & IFF_UP) == 0) 652 continue; 653 lflags = IFF_BROADCAST | iff_flag; 654 if (multicast_mode == PER_INTERFACE_MULTICAST) 655 lflags |= IFF_MULTICAST; 656 if ((flags & lflags) == 0) 657 continue; 658 if (ifm->ifm_type != RTM_NEWADDR) 659 quit("out of sync parsing NET_RT_IFLIST"); 660 ifam = (struct ifa_msghdr *)ifm; 661 info.rti_addrs = ifam->ifam_addrs; 662 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 663 &info); 664 /* gag, wish we could get rid of Internet dependencies */ 665 #define dstaddr info.rti_info[RTAX_BRD] 666 #define ifaddr info.rti_info[RTAX_IFA] 667 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 668 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 669 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 670 continue; 671 PORT_SA(dstaddr) = sp->s_port; 672 for (np = neighbors; np != NULL; np = np->n_next) { 673 if (memcmp(sdl->sdl_data, np->n_name, 674 sdl->sdl_nlen) == 0 && 675 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) { 676 break; 677 } 678 } 679 if (np != NULL) 680 continue; 681 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 682 np = malloc(len); 683 if (np == NULL) 684 quit("malloc of neighbor structure"); 685 memset(np, 0, len); 686 np->n_flags = flags; 687 np->n_addr = (struct sockaddr *)(np + 1); 688 np->n_addrlen = dstaddr->sa_len; 689 np->n_name = np->n_addrlen + (char *)np->n_addr; 690 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 691 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 692 if (multicast_mode == PER_INTERFACE_MULTICAST && 693 (flags & IFF_MULTICAST) != 0 && 694 (flags & IFF_LOOPBACK) == 0) { 695 struct ip_mreq mreq; 696 697 memcpy((char *)np->n_addr, (char *)ifaddr, 698 np->n_addrlen); 699 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 700 mreq.imr_interface.s_addr = 701 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 702 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 703 &mreq, sizeof(mreq)) < 0) { 704 syslog(LOG_ERR, 705 "setsockopt IP_ADD_MEMBERSHIP: %m"); 706 #if 0 707 /* Fall back to broadcast on this if. */ 708 np->n_flags &= ~IFF_MULTICAST; 709 #else 710 free(np); 711 continue; 712 #endif 713 } 714 } 715 np->n_next = neighbors; 716 neighbors = np; 717 } 718 free(buf); 719 return (1); 720 } 721 722 #ifdef DEBUG 723 void 724 Sendto(int s, const void *buf, size_t cc, int flags, const struct sockaddr *to, 725 int tolen) 726 { 727 struct whod *w; 728 struct whoent *we; 729 struct sockaddr_in *sin; 730 731 w = (struct whod *)buf; 732 sin = (struct sockaddr_in *)to; 733 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 734 ntohs(sin->sin_port)); 735 printf("hostname %s %s\n", w->wd_hostname, 736 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 737 printf("load %4.2f, %4.2f, %4.2f\n", 738 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 739 ntohl(w->wd_loadav[2]) / 100.0); 740 cc -= WHDRSIZE; 741 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 742 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time)); 743 744 printf("%-8.8s %s:%s %.12s", we->we_utmp.out_name, 745 w->wd_hostname, we->we_utmp.out_line, ctime(&t) + 4); 746 we->we_idle = ntohl(we->we_idle) / 60; 747 if (we->we_idle != 0) { 748 if (we->we_idle >= 100 * 60) 749 we->we_idle = 100 * 60 - 1; 750 if (we->we_idle >= 60) 751 printf(" %2d", we->we_idle / 60); 752 else 753 printf(" "); 754 printf(":%02d", we->we_idle % 60); 755 } 756 printf("\n"); 757 } 758 } 759 760 char * 761 interval(int time, char *updown) 762 { 763 static char resbuf[32]; 764 int days, hours, minutes; 765 766 if (time < 0 || time > 3 * 30 * 24 * 60 * 60) { 767 (void) sprintf(resbuf, " %s ??:??", updown); 768 return (resbuf); 769 } 770 minutes = (time + 59) / 60; /* round to minutes */ 771 hours = minutes / 60; 772 minutes %= 60; 773 days = hours / 24; 774 hours %= 24; 775 if (days > 0) { 776 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 777 updown, days, hours, minutes); 778 } else { 779 (void) sprintf(resbuf, "%s %2d:%02d", 780 updown, hours, minutes); 781 } 782 return (resbuf); 783 } 784 #endif 785