rwhod.c revision 263234
1/*- 2 * Copyright (c) 1983, 1993 The Regents of the University of California. 3 * Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#ifndef lint 32static const char copyright[] = 33"@(#) Copyright (c) 1983, 1993\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35#endif /* not lint */ 36 37#if 0 38#ifndef lint 39static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; 40#endif /* not lint */ 41#endif 42 43#include <sys/cdefs.h> 44__FBSDID("$FreeBSD: head/usr.sbin/rwhod/rwhod.c 263234 2014-03-16 11:04:44Z rwatson $"); 45 46#include <sys/capsicum.h> 47#include <sys/param.h> 48#include <sys/socket.h> 49#include <sys/stat.h> 50#include <sys/signal.h> 51#include <sys/ioctl.h> 52#include <sys/sysctl.h> 53#include <sys/procdesc.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 <err.h> 65#include <errno.h> 66#include <fcntl.h> 67#include <grp.h> 68#include <netdb.h> 69#include <paths.h> 70#include <pwd.h> 71#include <stdio.h> 72#include <stdlib.h> 73#include <string.h> 74#include <syslog.h> 75#include <timeconv.h> 76#include <utmpx.h> 77#include <unistd.h> 78 79#define UNPRIV_USER "daemon" 80#define UNPRIV_GROUP "daemon" 81 82#define NO_MULTICAST 0 /* multicast modes */ 83#define PER_INTERFACE_MULTICAST 1 84#define SCOPED_MULTICAST 2 85 86#define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 87 88#define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 89 /* (belongs in protocols/rwhod.h) */ 90 91int insecure_mode; 92int quiet_mode; 93int iff_flag = IFF_POINTOPOINT; 94int multicast_mode = NO_MULTICAST; 95int multicast_scope; 96struct sockaddr_in multicast_addr = 97 { sizeof(multicast_addr), AF_INET, 0, { 0 }, { 0 } }; 98 99/* 100 * Sleep interval. Don't forget to change the down time check in ruptime 101 * if this is changed. 102 */ 103#define SL_INTERVAL (3 * 60) 104 105char myname[MAXHOSTNAMELEN]; 106 107/* 108 * We communicate with each neighbor in a list constructed at the time we're 109 * started up. Neighbors are currently directly connected via a hardware 110 * interface. 111 */ 112struct neighbor { 113 struct neighbor *n_next; 114 char *n_name; /* interface name */ 115 struct sockaddr *n_addr; /* who to send to */ 116 int n_addrlen; /* size of address */ 117 int n_flags; /* should forward?, interface flags */ 118}; 119 120struct neighbor *neighbors; 121struct whod mywd; 122struct servent *sp; 123int s; 124int fdp; 125pid_t pid_child_receiver; 126 127#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 128 129int configure(int so); 130void getboottime(int signo __unused); 131void receiver_process(void); 132void rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo); 133void run_as(uid_t *uid, gid_t *gid); 134void quit(const char *msg); 135void sender_process(void); 136int verify(char *name, int maxlen); 137static void usage(void); 138 139#ifdef DEBUG 140char *interval(int time, char *updown); 141void Sendto(int s, const void *buf, size_t cc, int flags, 142 const struct sockaddr *to, int tolen); 143#define sendto Sendto 144#endif 145 146/* 147 * This version of Berkeley's rwhod has been modified to use IP multicast 148 * datagrams, under control of a new command-line option: 149 * 150 * rwhod -m causes rwhod to use IP multicast (instead of 151 * broadcast or unicast) on all interfaces that have 152 * the IFF_MULTICAST flag set in their "ifnet" structs 153 * (excluding the loopback interface). The multicast 154 * reports are sent with a time-to-live of 1, to prevent 155 * forwarding beyond the directly-connected subnet(s). 156 * 157 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 158 * time-to-live of <ttl>, via a SINGLE interface rather 159 * than all interfaces. <ttl> must be between 0 and 160 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 161 * is different than "-m", in that "-m 1" specifies 162 * transmission on one interface only. 163 * 164 * When "-m" is used without a <ttl> argument, the program accepts multicast 165 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 166 * is given, it accepts multicast reports from only one interface, the one 167 * on which reports are sent (which may be controlled via the host's routing 168 * table). Regardless of the "-m" option, the program accepts broadcast or 169 * unicast reports from all interfaces. Thus, this program will hear the 170 * reports of old, non-multicasting rwhods, but, if multicasting is used, 171 * those old rwhods won't hear the reports generated by this program. 172 * 173 * -- Steve Deering, Stanford University, February 1989 174 */ 175int 176main(int argc, char *argv[]) 177{ 178 int on; 179 char *cp; 180 struct sockaddr_in soin; 181 uid_t unpriv_uid; 182 gid_t unpriv_gid; 183 184 on = 1; 185 if (getuid()) 186 errx(1, "not super user"); 187 188 run_as(&unpriv_uid, &unpriv_gid); 189 190 argv++; 191 argc--; 192 while (argc > 0 && *argv[0] == '-') { 193 if (strcmp(*argv, "-m") == 0) { 194 if (argc > 1 && isdigit(*(argv + 1)[0])) { 195 argv++; 196 argc--; 197 multicast_mode = SCOPED_MULTICAST; 198 multicast_scope = atoi(*argv); 199 if (multicast_scope > MAX_MULTICAST_SCOPE) { 200 errx(1, "ttl must not exceed %u", 201 MAX_MULTICAST_SCOPE); 202 } 203 } else { 204 multicast_mode = PER_INTERFACE_MULTICAST; 205 } 206 } else if (strcmp(*argv, "-i") == 0) { 207 insecure_mode = 1; 208 } else if (strcmp(*argv, "-l") == 0) { 209 quiet_mode = 1; 210 } else if (strcmp(*argv, "-p") == 0) { 211 iff_flag = 0; 212 } else { 213 usage(); 214 } 215 argv++; 216 argc--; 217 } 218 if (argc > 0) 219 usage(); 220#ifndef DEBUG 221 daemon(1, 0); 222#endif 223 (void) signal(SIGHUP, getboottime); 224 openlog("rwhod", LOG_PID | LOG_NDELAY, LOG_DAEMON); 225 sp = getservbyname("who", "udp"); 226 if (sp == NULL) { 227 syslog(LOG_ERR, "who/udp: unknown service"); 228 exit(1); 229 } 230 if (chdir(_PATH_RWHODIR) < 0) { 231 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 232 exit(1); 233 } 234 /* 235 * Establish host name as returned by system. 236 */ 237 if (gethostname(myname, sizeof(myname) - 1) < 0) { 238 syslog(LOG_ERR, "gethostname: %m"); 239 exit(1); 240 } 241 if ((cp = strchr(myname, '.')) != NULL) 242 *cp = '\0'; 243 strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname)); 244 getboottime(0); 245 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 246 syslog(LOG_ERR, "socket: %m"); 247 exit(1); 248 } 249 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 250 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 251 exit(1); 252 } 253 memset(&soin, 0, sizeof(soin)); 254 soin.sin_len = sizeof(soin); 255 soin.sin_family = AF_INET; 256 soin.sin_port = sp->s_port; 257 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) { 258 syslog(LOG_ERR, "bind: %m"); 259 exit(1); 260 } 261 if (setgid(unpriv_gid) != 0) { 262 syslog(LOG_ERR, "setgid: %m"); 263 exit(1); 264 } 265 if (setgroups(1, &unpriv_gid) != 0) { /* XXX BOGUS groups[0] = egid */ 266 syslog(LOG_ERR, "setgroups: %m"); 267 exit(1); 268 } 269 if (setuid(unpriv_uid) != 0) { 270 syslog(LOG_ERR, "setuid: %m"); 271 exit(1); 272 } 273 if (!configure(s)) 274 exit(1); 275 if (!quiet_mode) { 276 pid_child_receiver = pdfork(&fdp, 0); 277 if (pid_child_receiver == 0) { 278 receiver_process(); 279 } else if (pid_child_receiver > 0) { 280 sender_process(); 281 } else if (pid_child_receiver == -1) { 282 if (errno == ENOSYS) { 283 syslog(LOG_ERR, 284 "The pdfork(2) system call is not available - kernel too old."); 285 } else { 286 syslog(LOG_ERR, "pdfork: %m"); 287 } 288 exit(1); 289 } 290 } else { 291 receiver_process(); 292 } 293} 294 295static void 296usage(void) 297{ 298 299 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 300 exit(1); 301} 302 303void 304run_as(uid_t *uid, gid_t *gid) 305{ 306 struct passwd *pw; 307 struct group *gr; 308 309 pw = getpwnam(UNPRIV_USER); 310 if (pw == NULL) { 311 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 312 exit(1); 313 } 314 *uid = pw->pw_uid; 315 316 gr = getgrnam(UNPRIV_GROUP); 317 if (gr == NULL) { 318 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 319 exit(1); 320 } 321 *gid = gr->gr_gid; 322} 323 324/* 325 * Check out host name for unprintables 326 * and other funnies before allowing a file 327 * to be created. Sorry, but blanks aren't allowed. 328 */ 329int 330verify(char *name, int maxlen) 331{ 332 int size; 333 334 size = 0; 335 while (*name != '\0' && size < maxlen - 1) { 336 if (!isascii((unsigned char)*name) || 337 !(isalnum((unsigned char)*name) || 338 ispunct((unsigned char)*name))) { 339 return (0); 340 } 341 name++; 342 size++; 343 } 344 *name = '\0'; 345 return (size > 0); 346} 347 348void 349receiver_process(void) 350{ 351 struct sockaddr_in from; 352 struct stat st; 353 cap_rights_t rights; 354 char path[64]; 355 int dirfd; 356 struct whod wd; 357 socklen_t len; 358 int cc, whod; 359 time_t t; 360 361 len = sizeof(from); 362 dirfd = open(".", O_RDONLY | O_DIRECTORY); 363 if (dirfd < 0) { 364 syslog(LOG_WARNING, "%s: %m", _PATH_RWHODIR); 365 exit(1); 366 } 367 cap_rights_init(&rights, CAP_CREATE, CAP_FSTAT, CAP_FTRUNCATE, 368 CAP_LOOKUP, CAP_SEEK, CAP_WRITE); 369 if (cap_rights_limit(dirfd, &rights) < 0 && errno != ENOSYS) { 370 syslog(LOG_WARNING, "cap_rights_limit: %m"); 371 exit(1); 372 } 373 if (cap_enter() < 0 && errno != ENOSYS) { 374 syslog(LOG_ERR, "cap_enter: %m"); 375 exit(1); 376 } 377 for (;;) { 378 cc = recvfrom(s, &wd, sizeof(wd), 0, (struct sockaddr *)&from, 379 &len); 380 if (cc <= 0) { 381 if (cc < 0 && errno != EINTR) 382 syslog(LOG_WARNING, "recv: %m"); 383 continue; 384 } 385 if (from.sin_port != sp->s_port && !insecure_mode) { 386 syslog(LOG_WARNING, "%d: bad source port from %s", 387 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 388 continue; 389 } 390 if (cc < WHDRSIZE) { 391 syslog(LOG_WARNING, "short packet from %s", 392 inet_ntoa(from.sin_addr)); 393 continue; 394 } 395 if (wd.wd_vers != WHODVERSION) 396 continue; 397 if (wd.wd_type != WHODTYPE_STATUS) 398 continue; 399 if (!verify(wd.wd_hostname, sizeof(wd.wd_hostname))) { 400 syslog(LOG_WARNING, "malformed host name from %s", 401 inet_ntoa(from.sin_addr)); 402 continue; 403 } 404 (void) snprintf(path, sizeof(path), "whod.%s", wd.wd_hostname); 405 /* 406 * Rather than truncating and growing the file each time, 407 * use ftruncate if size is less than previous size. 408 */ 409 whod = openat(dirfd, path, O_WRONLY | O_CREAT, 0644); 410 if (whod < 0) { 411 syslog(LOG_WARNING, "%s: %m", path); 412 continue; 413 } 414 cap_rights_init(&rights, CAP_FSTAT, CAP_FTRUNCATE, CAP_WRITE); 415 if (cap_rights_limit(whod, &rights) < 0 && errno != ENOSYS) { 416 syslog(LOG_WARNING, "cap_rights_limit: %m"); 417 exit(1); 418 } 419#if ENDIAN != BIG_ENDIAN 420 { 421 struct whoent *we; 422 int i, n; 423 424 n = (cc - WHDRSIZE) / sizeof(struct whoent); 425 /* undo header byte swapping before writing to file */ 426 wd.wd_sendtime = ntohl(wd.wd_sendtime); 427 for (i = 0; i < 3; i++) 428 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 429 wd.wd_boottime = ntohl(wd.wd_boottime); 430 we = wd.wd_we; 431 for (i = 0; i < n; i++) { 432 we->we_idle = ntohl(we->we_idle); 433 we->we_utmp.out_time = 434 ntohl(we->we_utmp.out_time); 435 we++; 436 } 437 } 438#endif 439 (void) time(&t); 440 wd.wd_recvtime = _time_to_int(t); 441 (void) write(whod, (char *)&wd, cc); 442 if (fstat(whod, &st) < 0 || st.st_size > cc) 443 ftruncate(whod, cc); 444 (void) close(whod); 445 } 446 (void) close(dirfd); 447} 448 449void 450sender_process(void) 451{ 452 int sendcount; 453 double avenrun[3]; 454 time_t now; 455 int i, cc, status; 456 struct utmpx *ut; 457 struct stat stb; 458 struct neighbor *np; 459 struct whoent *we, *wend; 460 461 sendcount = 0; 462 for (;;) { 463 we = mywd.wd_we; 464 now = time(NULL); 465 if (sendcount % 10 == 0) 466 getboottime(0); 467 sendcount++; 468 wend = &mywd.wd_we[1024 / sizeof(struct whoent)]; 469 setutxent(); 470 while ((ut = getutxent()) != NULL && we < wend) { 471 if (ut->ut_type != USER_PROCESS) 472 continue; 473 strncpy(we->we_utmp.out_line, ut->ut_line, 474 sizeof(we->we_utmp.out_line)); 475 strncpy(we->we_utmp.out_name, ut->ut_user, 476 sizeof(we->we_utmp.out_name)); 477 we->we_utmp.out_time = 478 htonl(_time_to_time32(ut->ut_tv.tv_sec)); 479 we++; 480 } 481 endutxent(); 482 483 if (chdir(_PATH_DEV) < 0) { 484 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 485 exit(1); 486 } 487 wend = we; 488 for (we = mywd.wd_we; we < wend; we++) { 489 if (stat(we->we_utmp.out_line, &stb) >= 0) 490 we->we_idle = htonl(now - stb.st_atime); 491 we++; 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 542void 543getboottime(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, 2, &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 559void 560quit(const char *msg) 561{ 562 563 syslog(LOG_ERR, "%s", msg); 564 exit(1); 565} 566 567void 568rt_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 */ 587int 588configure(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, 6, NULL, &needed, NULL, 0) < 0) 634 quit("route-sysctl-estimate"); 635 if ((buf = malloc(needed)) == NULL) 636 quit("malloc"); 637 if (sysctl(mib, 6, 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 721void 722Sendto(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 758char * 759interval(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