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