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 #include <sys/param.h> 34 #include <sys/capsicum.h> 35 #include <sys/ioctl.h> 36 #include <sys/procdesc.h> 37 #include <sys/socket.h> 38 #include <sys/stat.h> 39 #include <sys/signal.h> 40 #include <sys/sysctl.h> 41 #include <sys/wait.h> 42 43 #include <net/if.h> 44 #include <net/if_dl.h> 45 #include <net/route.h> 46 #include <netinet/in.h> 47 #include <arpa/inet.h> 48 #include <protocols/rwhod.h> 49 50 #include <ctype.h> 51 #include <capsicum_helpers.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <grp.h> 56 #include <netdb.h> 57 #include <paths.h> 58 #include <pwd.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <syslog.h> 63 #include <timeconv.h> 64 #include <utmpx.h> 65 #include <unistd.h> 66 67 #define UNPRIV_USER "daemon" 68 #define UNPRIV_GROUP "daemon" 69 70 #define NO_MULTICAST 0 /* multicast modes */ 71 #define PER_INTERFACE_MULTICAST 1 72 #define SCOPED_MULTICAST 2 73 74 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 75 76 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 77 /* (belongs in protocols/rwhod.h) */ 78 79 int insecure_mode; 80 int quiet_mode; 81 int iff_flag = IFF_POINTOPOINT; 82 int multicast_mode = NO_MULTICAST; 83 int multicast_scope; 84 struct sockaddr_in multicast_addr = 85 { sizeof(multicast_addr), AF_INET, 0, { 0 }, { 0 } }; 86 87 /* 88 * Sleep interval. Don't forget to change the down time check in ruptime 89 * if this is changed. 90 */ 91 #define SL_INTERVAL (3 * 60) 92 93 char myname[MAXHOSTNAMELEN]; 94 95 /* 96 * We communicate with each neighbor in a list constructed at the time we're 97 * started up. Neighbors are currently directly connected via a hardware 98 * interface. 99 */ 100 struct neighbor { 101 struct neighbor *n_next; 102 char *n_name; /* interface name */ 103 struct sockaddr *n_addr; /* who to send to */ 104 int n_addrlen; /* size of address */ 105 int n_flags; /* should forward?, interface flags */ 106 }; 107 108 struct neighbor *neighbors; 109 struct whod mywd; 110 struct servent *sp; 111 int s; 112 int fdp; 113 pid_t pid_child_receiver; 114 115 #define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 116 117 int configure(int so); 118 void getboottime(int signo __unused); 119 void receiver_process(void); 120 void rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo); 121 void run_as(uid_t *uid, gid_t *gid); 122 void quit(const char *msg); 123 void sender_process(void); 124 int verify(char *name, int maxlen); 125 static void usage(void) __dead2; 126 127 #ifdef DEBUG 128 char *interval(int time, char *updown); 129 void Sendto(int s, const void *buf, size_t cc, int flags, 130 const struct sockaddr *to, int tolen); 131 #define sendto Sendto 132 #endif 133 134 /* 135 * This version of Berkeley's rwhod has been modified to use IP multicast 136 * datagrams, under control of a new command-line option: 137 * 138 * rwhod -m causes rwhod to use IP multicast (instead of 139 * broadcast or unicast) on all interfaces that have 140 * the IFF_MULTICAST flag set in their "ifnet" structs 141 * (excluding the loopback interface). The multicast 142 * reports are sent with a time-to-live of 1, to prevent 143 * forwarding beyond the directly-connected subnet(s). 144 * 145 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 146 * time-to-live of <ttl>, via a SINGLE interface rather 147 * than all interfaces. <ttl> must be between 0 and 148 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 149 * is different than "-m", in that "-m 1" specifies 150 * transmission on one interface only. 151 * 152 * When "-m" is used without a <ttl> argument, the program accepts multicast 153 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 154 * is given, it accepts multicast reports from only one interface, the one 155 * on which reports are sent (which may be controlled via the host's routing 156 * table). Regardless of the "-m" option, the program accepts broadcast or 157 * unicast reports from all interfaces. Thus, this program will hear the 158 * reports of old, non-multicasting rwhods, but, if multicasting is used, 159 * those old rwhods won't hear the reports generated by this program. 160 * 161 * -- Steve Deering, Stanford University, February 1989 162 */ 163 int 164 main(int argc, char *argv[]) 165 { 166 int on; 167 char *cp; 168 struct sockaddr_in soin; 169 uid_t unpriv_uid; 170 gid_t unpriv_gid; 171 172 on = 1; 173 if (getuid()) 174 errx(1, "not super user"); 175 176 run_as(&unpriv_uid, &unpriv_gid); 177 178 argv++; 179 argc--; 180 while (argc > 0 && *argv[0] == '-') { 181 if (strcmp(*argv, "-m") == 0) { 182 if (argc > 1 && isdigit(*(argv + 1)[0])) { 183 argv++; 184 argc--; 185 multicast_mode = SCOPED_MULTICAST; 186 multicast_scope = atoi(*argv); 187 if (multicast_scope > MAX_MULTICAST_SCOPE) { 188 errx(1, "ttl must not exceed %u", 189 MAX_MULTICAST_SCOPE); 190 } 191 } else { 192 multicast_mode = PER_INTERFACE_MULTICAST; 193 } 194 } else if (strcmp(*argv, "-i") == 0) { 195 insecure_mode = 1; 196 } else if (strcmp(*argv, "-l") == 0) { 197 quiet_mode = 1; 198 } else if (strcmp(*argv, "-p") == 0) { 199 iff_flag = 0; 200 } else { 201 usage(); 202 } 203 argv++; 204 argc--; 205 } 206 if (argc > 0) 207 usage(); 208 #ifndef DEBUG 209 daemon(1, 0); 210 #endif 211 (void) signal(SIGHUP, getboottime); 212 openlog("rwhod", LOG_PID | LOG_NDELAY, LOG_DAEMON); 213 sp = getservbyname("who", "udp"); 214 if (sp == NULL) { 215 syslog(LOG_ERR, "who/udp: unknown service"); 216 exit(1); 217 } 218 if (chdir(_PATH_RWHODIR) < 0) { 219 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 220 exit(1); 221 } 222 /* 223 * Establish host name as returned by system. 224 */ 225 if (gethostname(myname, sizeof(myname) - 1) < 0) { 226 syslog(LOG_ERR, "gethostname: %m"); 227 exit(1); 228 } 229 if ((cp = strchr(myname, '.')) != NULL) 230 *cp = '\0'; 231 strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname)); 232 getboottime(0); 233 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 234 syslog(LOG_ERR, "socket: %m"); 235 exit(1); 236 } 237 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 238 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 239 exit(1); 240 } 241 memset(&soin, 0, sizeof(soin)); 242 soin.sin_len = sizeof(soin); 243 soin.sin_family = AF_INET; 244 soin.sin_port = sp->s_port; 245 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) { 246 syslog(LOG_ERR, "bind: %m"); 247 exit(1); 248 } 249 if (setgid(unpriv_gid) != 0) { 250 syslog(LOG_ERR, "setgid: %m"); 251 exit(1); 252 } 253 if (setgroups(1, &unpriv_gid) != 0) { /* XXX BOGUS groups[0] = egid */ 254 syslog(LOG_ERR, "setgroups: %m"); 255 exit(1); 256 } 257 if (setuid(unpriv_uid) != 0) { 258 syslog(LOG_ERR, "setuid: %m"); 259 exit(1); 260 } 261 if (!configure(s)) 262 exit(1); 263 if (!quiet_mode) { 264 pid_child_receiver = pdfork(&fdp, 0); 265 if (pid_child_receiver == 0) { 266 receiver_process(); 267 } else if (pid_child_receiver > 0) { 268 sender_process(); 269 } else if (pid_child_receiver == -1) { 270 if (errno == ENOSYS) { 271 syslog(LOG_ERR, 272 "The pdfork(2) system call is not available - kernel too old."); 273 } else { 274 syslog(LOG_ERR, "pdfork: %m"); 275 } 276 exit(1); 277 } 278 } else { 279 receiver_process(); 280 } 281 } 282 283 static void 284 usage(void) 285 { 286 287 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 288 exit(1); 289 } 290 291 void 292 run_as(uid_t *uid, gid_t *gid) 293 { 294 struct passwd *pw; 295 struct group *gr; 296 297 pw = getpwnam(UNPRIV_USER); 298 if (pw == NULL) { 299 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 300 exit(1); 301 } 302 *uid = pw->pw_uid; 303 304 gr = getgrnam(UNPRIV_GROUP); 305 if (gr == NULL) { 306 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 307 exit(1); 308 } 309 *gid = gr->gr_gid; 310 } 311 312 /* 313 * Check out host name for unprintables 314 * and other funnies before allowing a file 315 * to be created. Sorry, but blanks aren't allowed. 316 */ 317 int 318 verify(char *name, int maxlen) 319 { 320 int size; 321 322 size = 0; 323 while (*name != '\0' && size < maxlen - 1) { 324 if (!isascii((unsigned char)*name) || 325 !(isalnum((unsigned char)*name) || 326 ispunct((unsigned char)*name))) { 327 return (0); 328 } 329 name++; 330 size++; 331 } 332 *name = '\0'; 333 return (size > 0); 334 } 335 336 void 337 receiver_process(void) 338 { 339 struct sockaddr_in from; 340 struct stat st; 341 cap_rights_t rights; 342 char path[64]; 343 int dirfd; 344 struct whod wd; 345 socklen_t len; 346 int cc, whod; 347 time_t t; 348 349 len = sizeof(from); 350 dirfd = open(".", O_RDONLY | O_DIRECTORY); 351 if (dirfd < 0) { 352 syslog(LOG_WARNING, "%s: %m", _PATH_RWHODIR); 353 exit(1); 354 } 355 cap_rights_init(&rights, CAP_CREATE, CAP_FSTAT, CAP_FTRUNCATE, 356 CAP_LOOKUP, CAP_SEEK, CAP_WRITE); 357 if (caph_rights_limit(dirfd, &rights) < 0) { 358 syslog(LOG_WARNING, "cap_rights_limit: %m"); 359 exit(1); 360 } 361 if (caph_enter() < 0) { 362 syslog(LOG_ERR, "cap_enter: %m"); 363 exit(1); 364 } 365 for (;;) { 366 cc = recvfrom(s, &wd, sizeof(wd), 0, (struct sockaddr *)&from, 367 &len); 368 if (cc <= 0) { 369 if (cc < 0 && errno != EINTR) 370 syslog(LOG_WARNING, "recv: %m"); 371 continue; 372 } 373 if (from.sin_port != sp->s_port && !insecure_mode) { 374 syslog(LOG_WARNING, "%d: bad source port from %s", 375 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 376 continue; 377 } 378 if (cc < WHDRSIZE) { 379 syslog(LOG_WARNING, "short packet from %s", 380 inet_ntoa(from.sin_addr)); 381 continue; 382 } 383 if (wd.wd_vers != WHODVERSION) 384 continue; 385 if (wd.wd_type != WHODTYPE_STATUS) 386 continue; 387 if (!verify(wd.wd_hostname, sizeof(wd.wd_hostname))) { 388 syslog(LOG_WARNING, "malformed host name from %s", 389 inet_ntoa(from.sin_addr)); 390 continue; 391 } 392 (void) snprintf(path, sizeof(path), "whod.%s", wd.wd_hostname); 393 /* 394 * Rather than truncating and growing the file each time, 395 * use ftruncate if size is less than previous size. 396 */ 397 whod = openat(dirfd, path, O_WRONLY | O_CREAT, 0644); 398 if (whod < 0) { 399 syslog(LOG_WARNING, "%s: %m", path); 400 continue; 401 } 402 cap_rights_init(&rights, CAP_FSTAT, CAP_FTRUNCATE, CAP_WRITE); 403 if (caph_rights_limit(whod, &rights) < 0) { 404 syslog(LOG_WARNING, "cap_rights_limit: %m"); 405 exit(1); 406 } 407 #if ENDIAN != BIG_ENDIAN 408 { 409 struct whoent *we; 410 int i, n; 411 412 n = (cc - WHDRSIZE) / sizeof(struct whoent); 413 /* undo header byte swapping before writing to file */ 414 wd.wd_sendtime = ntohl(wd.wd_sendtime); 415 for (i = 0; i < 3; i++) 416 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 417 wd.wd_boottime = ntohl(wd.wd_boottime); 418 we = wd.wd_we; 419 for (i = 0; i < n; i++) { 420 we->we_idle = ntohl(we->we_idle); 421 we->we_utmp.out_time = 422 ntohl(we->we_utmp.out_time); 423 we++; 424 } 425 } 426 #endif 427 (void) time(&t); 428 wd.wd_recvtime = _time_to_int(t); 429 (void) write(whod, (char *)&wd, cc); 430 if (fstat(whod, &st) < 0 || st.st_size > cc) 431 ftruncate(whod, cc); 432 (void) close(whod); 433 } 434 (void) close(dirfd); 435 } 436 437 void 438 sender_process(void) 439 { 440 int sendcount; 441 double avenrun[3]; 442 time_t now; 443 int i, cc, status; 444 struct utmpx *ut; 445 struct stat stb; 446 struct neighbor *np; 447 struct whoent *we, *wend; 448 449 sendcount = 0; 450 for (;;) { 451 we = mywd.wd_we; 452 now = time(NULL); 453 if (sendcount % 10 == 0) 454 getboottime(0); 455 sendcount++; 456 wend = &mywd.wd_we[1024 / sizeof(struct whoent)]; 457 setutxent(); 458 while ((ut = getutxent()) != NULL && we < wend) { 459 if (ut->ut_type != USER_PROCESS) 460 continue; 461 strncpy(we->we_utmp.out_line, ut->ut_line, 462 sizeof(we->we_utmp.out_line)); 463 strncpy(we->we_utmp.out_name, ut->ut_user, 464 sizeof(we->we_utmp.out_name)); 465 we->we_utmp.out_time = 466 htonl(_time_to_time32(ut->ut_tv.tv_sec)); 467 we++; 468 } 469 endutxent(); 470 471 if (chdir(_PATH_DEV) < 0) { 472 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 473 exit(1); 474 } 475 wend = we; 476 for (we = mywd.wd_we; we < wend; we++) { 477 if (stat(we->we_utmp.out_line, &stb) >= 0) 478 we->we_idle = htonl(now - stb.st_atime); 479 } 480 (void) getloadavg(avenrun, 481 sizeof(avenrun) / sizeof(avenrun[0])); 482 for (i = 0; i < 3; i++) 483 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 484 cc = (char *)wend - (char *)&mywd; 485 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 486 mywd.wd_vers = WHODVERSION; 487 mywd.wd_type = WHODTYPE_STATUS; 488 if (multicast_mode == SCOPED_MULTICAST) { 489 (void) sendto(s, (char *)&mywd, cc, 0, 490 (struct sockaddr *)&multicast_addr, 491 sizeof(multicast_addr)); 492 } else { 493 for (np = neighbors; np != NULL; np = np->n_next) { 494 if (multicast_mode == PER_INTERFACE_MULTICAST && 495 (np->n_flags & IFF_MULTICAST) != 0) { 496 /* 497 * Select the outgoing interface for the 498 * multicast. 499 */ 500 if (setsockopt(s, IPPROTO_IP, 501 IP_MULTICAST_IF, 502 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 503 sizeof(struct in_addr)) < 0) { 504 syslog(LOG_ERR, 505 "setsockopt IP_MULTICAST_IF: %m"); 506 exit(1); 507 } 508 (void) sendto(s, (char *)&mywd, cc, 0, 509 (struct sockaddr *)&multicast_addr, 510 sizeof(multicast_addr)); 511 } else { 512 (void) sendto(s, (char *)&mywd, cc, 0, 513 np->n_addr, np->n_addrlen); 514 } 515 } 516 } 517 if (chdir(_PATH_RWHODIR) < 0) { 518 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 519 exit(1); 520 } 521 if (waitpid(pid_child_receiver, &status, WNOHANG) == 522 pid_child_receiver) { 523 break; 524 } 525 sleep(SL_INTERVAL); 526 } 527 } 528 529 void 530 getboottime(int signo __unused) 531 { 532 int mib[2]; 533 size_t size; 534 struct timeval tm; 535 536 mib[0] = CTL_KERN; 537 mib[1] = KERN_BOOTTIME; 538 size = sizeof(tm); 539 if (sysctl(mib, nitems(mib), &tm, &size, NULL, 0) == -1) { 540 syslog(LOG_ERR, "cannot get boottime: %m"); 541 exit(1); 542 } 543 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 544 } 545 546 void 547 quit(const char *msg) 548 { 549 550 syslog(LOG_ERR, "%s", msg); 551 exit(1); 552 } 553 554 void 555 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 556 { 557 struct sockaddr *sa; 558 int i; 559 560 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 561 for (i = 0; i < RTAX_MAX && cp < cplim; i++) { 562 if ((rtinfo->rti_addrs & (1 << i)) == 0) 563 continue; 564 sa = (struct sockaddr *)cp; 565 rtinfo->rti_info[i] = sa; 566 cp += SA_SIZE(sa); 567 } 568 } 569 570 /* 571 * Figure out device configuration and select 572 * networks which deserve status information. 573 */ 574 int 575 configure(int so) 576 { 577 struct neighbor *np; 578 struct if_msghdr *ifm; 579 struct ifa_msghdr *ifam; 580 struct sockaddr_dl *sdl; 581 size_t needed; 582 int mib[6], flags, lflags, len; 583 char *buf, *lim, *next; 584 struct rt_addrinfo info; 585 586 flags = 0; 587 if (multicast_mode != NO_MULTICAST) { 588 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 589 multicast_addr.sin_port = sp->s_port; 590 } 591 592 if (multicast_mode == SCOPED_MULTICAST) { 593 struct ip_mreq mreq; 594 unsigned char ttl; 595 596 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 597 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 598 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP, 599 &mreq, sizeof(mreq)) < 0) { 600 syslog(LOG_ERR, 601 "setsockopt IP_ADD_MEMBERSHIP: %m"); 602 return (0); 603 } 604 ttl = multicast_scope; 605 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, 606 sizeof(ttl)) < 0) { 607 syslog(LOG_ERR, 608 "setsockopt IP_MULTICAST_TTL: %m"); 609 return (0); 610 } 611 return (1); 612 } 613 614 mib[0] = CTL_NET; 615 mib[1] = PF_ROUTE; 616 mib[2] = 0; 617 mib[3] = AF_INET; 618 mib[4] = NET_RT_IFLIST; 619 mib[5] = 0; 620 if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0) 621 quit("route-sysctl-estimate"); 622 if ((buf = malloc(needed)) == NULL) 623 quit("malloc"); 624 if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) 625 quit("actual retrieval of interface table"); 626 lim = buf + needed; 627 628 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 629 for (next = buf; next < lim; next += ifm->ifm_msglen) { 630 ifm = (struct if_msghdr *)next; 631 if (ifm->ifm_type == RTM_IFINFO) { 632 sdl = (struct sockaddr_dl *)(ifm + 1); 633 flags = ifm->ifm_flags; 634 continue; 635 } 636 if ((flags & IFF_UP) == 0) 637 continue; 638 lflags = IFF_BROADCAST | iff_flag; 639 if (multicast_mode == PER_INTERFACE_MULTICAST) 640 lflags |= IFF_MULTICAST; 641 if ((flags & lflags) == 0) 642 continue; 643 if (ifm->ifm_type != RTM_NEWADDR) 644 quit("out of sync parsing NET_RT_IFLIST"); 645 ifam = (struct ifa_msghdr *)ifm; 646 info.rti_addrs = ifam->ifam_addrs; 647 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 648 &info); 649 /* gag, wish we could get rid of Internet dependencies */ 650 #define dstaddr info.rti_info[RTAX_BRD] 651 #define ifaddr info.rti_info[RTAX_IFA] 652 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 653 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 654 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 655 continue; 656 PORT_SA(dstaddr) = sp->s_port; 657 for (np = neighbors; np != NULL; np = np->n_next) { 658 if (memcmp(sdl->sdl_data, np->n_name, 659 sdl->sdl_nlen) == 0 && 660 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) { 661 break; 662 } 663 } 664 if (np != NULL) 665 continue; 666 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 667 np = malloc(len); 668 if (np == NULL) 669 quit("malloc of neighbor structure"); 670 memset(np, 0, len); 671 np->n_flags = flags; 672 np->n_addr = (struct sockaddr *)(np + 1); 673 np->n_addrlen = dstaddr->sa_len; 674 np->n_name = np->n_addrlen + (char *)np->n_addr; 675 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 676 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 677 if (multicast_mode == PER_INTERFACE_MULTICAST && 678 (flags & IFF_MULTICAST) != 0 && 679 (flags & IFF_LOOPBACK) == 0) { 680 struct ip_mreq mreq; 681 682 memcpy((char *)np->n_addr, (char *)ifaddr, 683 np->n_addrlen); 684 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 685 mreq.imr_interface.s_addr = 686 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 687 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 688 &mreq, sizeof(mreq)) < 0) { 689 syslog(LOG_ERR, 690 "setsockopt IP_ADD_MEMBERSHIP: %m"); 691 #if 0 692 /* Fall back to broadcast on this if. */ 693 np->n_flags &= ~IFF_MULTICAST; 694 #else 695 free(np); 696 continue; 697 #endif 698 } 699 } 700 np->n_next = neighbors; 701 neighbors = np; 702 } 703 free(buf); 704 return (1); 705 } 706 707 #ifdef DEBUG 708 void 709 Sendto(int s, const void *buf, size_t cc, int flags, const struct sockaddr *to, 710 int tolen) 711 { 712 struct whod *w; 713 struct whoent *we; 714 struct sockaddr_in *sin; 715 716 w = (struct whod *)buf; 717 sin = (struct sockaddr_in *)to; 718 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 719 ntohs(sin->sin_port)); 720 printf("hostname %s %s\n", w->wd_hostname, 721 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 722 printf("load %4.2f, %4.2f, %4.2f\n", 723 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 724 ntohl(w->wd_loadav[2]) / 100.0); 725 cc -= WHDRSIZE; 726 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 727 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time)); 728 729 printf("%-8.8s %s:%s %.12s", we->we_utmp.out_name, 730 w->wd_hostname, we->we_utmp.out_line, ctime(&t) + 4); 731 we->we_idle = ntohl(we->we_idle) / 60; 732 if (we->we_idle != 0) { 733 if (we->we_idle >= 100 * 60) 734 we->we_idle = 100 * 60 - 1; 735 if (we->we_idle >= 60) 736 printf(" %2d", we->we_idle / 60); 737 else 738 printf(" "); 739 printf(":%02d", we->we_idle % 60); 740 } 741 printf("\n"); 742 } 743 } 744 745 char * 746 interval(int time, char *updown) 747 { 748 static char resbuf[32]; 749 int days, hours, minutes; 750 751 if (time < 0 || time > 3 * 30 * 24 * 60 * 60) { 752 (void) sprintf(resbuf, " %s ??:??", updown); 753 return (resbuf); 754 } 755 minutes = (time + 59) / 60; /* round to minutes */ 756 hours = minutes / 60; 757 minutes %= 60; 758 days = hours / 24; 759 hours %= 24; 760 if (days > 0) { 761 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 762 updown, days, hours, minutes); 763 } else { 764 (void) sprintf(resbuf, "%s %2d:%02d", 765 updown, hours, minutes); 766 } 767 return (resbuf); 768 } 769 #endif 770