rwhod.c revision 252605
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 252605 2013-07-03 21:07:02Z pjd $"); 45 46#include <sys/capability.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 syslog(LOG_ERR, "pdfork: %m"); 283 exit(1); 284 } 285 } else { 286 receiver_process(); 287 } 288} 289 290static void 291usage(void) 292{ 293 294 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 295 exit(1); 296} 297 298void 299run_as(uid_t *uid, gid_t *gid) 300{ 301 struct passwd *pw; 302 struct group *gr; 303 304 pw = getpwnam(UNPRIV_USER); 305 if (pw == NULL) { 306 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 307 exit(1); 308 } 309 *uid = pw->pw_uid; 310 311 gr = getgrnam(UNPRIV_GROUP); 312 if (gr == NULL) { 313 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 314 exit(1); 315 } 316 *gid = gr->gr_gid; 317} 318 319/* 320 * Check out host name for unprintables 321 * and other funnies before allowing a file 322 * to be created. Sorry, but blanks aren't allowed. 323 */ 324int 325verify(char *name, int maxlen) 326{ 327 int size; 328 329 size = 0; 330 while (*name != '\0' && size < maxlen - 1) { 331 if (!isascii(*name) || !isalnum(*name) || ispunct(*name)) 332 return (0); 333 name++; 334 size++; 335 } 336 *name = '\0'; 337 return (size > 0); 338} 339 340void 341receiver_process(void) 342{ 343 struct sockaddr_in from; 344 struct stat st; 345 char path[64]; 346 int dirfd; 347 struct whod wd; 348 socklen_t len; 349 int cc, whod; 350 time_t t; 351 352 len = sizeof(from); 353 dirfd = open(".", O_RDONLY | O_DIRECTORY); 354 if (dirfd < 0) { 355 syslog(LOG_WARNING, "%s: %m", _PATH_RWHODIR); 356 exit(1); 357 } 358 if (cap_rights_limit(dirfd, CAP_CREATE | CAP_WRITE | CAP_FTRUNCATE | 359 CAP_SEEK | CAP_LOOKUP | CAP_FSTAT) < 0 && errno != ENOSYS) { 360 syslog(LOG_WARNING, "cap_rights_limit: %m"); 361 exit(1); 362 } 363 if (cap_enter() < 0 && errno != ENOSYS) { 364 syslog(LOG_ERR, "cap_enter: %m"); 365 exit(1); 366 } 367 for (;;) { 368 cc = recvfrom(s, &wd, sizeof(wd), 0, (struct sockaddr *)&from, 369 &len); 370 if (cc <= 0) { 371 if (cc < 0 && errno != EINTR) 372 syslog(LOG_WARNING, "recv: %m"); 373 continue; 374 } 375 if (from.sin_port != sp->s_port && !insecure_mode) { 376 syslog(LOG_WARNING, "%d: bad source port from %s", 377 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 378 continue; 379 } 380 if (cc < WHDRSIZE) { 381 syslog(LOG_WARNING, "short packet from %s", 382 inet_ntoa(from.sin_addr)); 383 continue; 384 } 385 if (wd.wd_vers != WHODVERSION) 386 continue; 387 if (wd.wd_type != WHODTYPE_STATUS) 388 continue; 389 if (!verify(wd.wd_hostname, sizeof(wd.wd_hostname))) { 390 syslog(LOG_WARNING, "malformed host name from %s", 391 inet_ntoa(from.sin_addr)); 392 continue; 393 } 394 (void) snprintf(path, sizeof(path), "whod.%s", wd.wd_hostname); 395 /* 396 * Rather than truncating and growing the file each time, 397 * use ftruncate if size is less than previous size. 398 */ 399 whod = openat(dirfd, path, O_WRONLY | O_CREAT, 0644); 400 if (whod < 0) { 401 syslog(LOG_WARNING, "%s: %m", path); 402 continue; 403 } 404 if (cap_rights_limit(whod, CAP_WRITE | CAP_FTRUNCATE | 405 CAP_FSTAT) < 0 && errno != ENOSYS) { 406 syslog(LOG_WARNING, "cap_rights_limit: %m"); 407 exit(1); 408 } 409#if ENDIAN != BIG_ENDIAN 410 { 411 struct whoent *we; 412 int i, n; 413 414 n = (cc - WHDRSIZE) / sizeof(struct whoent); 415 /* undo header byte swapping before writing to file */ 416 wd.wd_sendtime = ntohl(wd.wd_sendtime); 417 for (i = 0; i < 3; i++) 418 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 419 wd.wd_boottime = ntohl(wd.wd_boottime); 420 we = wd.wd_we; 421 for (i = 0; i < n; i++) { 422 we->we_idle = ntohl(we->we_idle); 423 we->we_utmp.out_time = 424 ntohl(we->we_utmp.out_time); 425 we++; 426 } 427 } 428#endif 429 (void) time(&t); 430 wd.wd_recvtime = _time_to_int(t); 431 (void) write(whod, (char *)&wd, cc); 432 if (fstat(whod, &st) < 0 || st.st_size > cc) 433 ftruncate(whod, cc); 434 (void) close(whod); 435 } 436 (void) close(dirfd); 437} 438 439void 440sender_process(void) 441{ 442 int sendcount; 443 double avenrun[3]; 444 time_t now; 445 int i, cc, status; 446 struct utmpx *ut; 447 struct stat stb; 448 struct neighbor *np; 449 struct whoent *we, *wend; 450 451 sendcount = 0; 452 for (;;) { 453 we = mywd.wd_we; 454 now = time(NULL); 455 if (sendcount % 10 == 0) 456 getboottime(0); 457 sendcount++; 458 wend = &mywd.wd_we[1024 / sizeof(struct whoent)]; 459 setutxent(); 460 while ((ut = getutxent()) != NULL && we < wend) { 461 if (ut->ut_type != USER_PROCESS) 462 continue; 463 strncpy(we->we_utmp.out_line, ut->ut_line, 464 sizeof(we->we_utmp.out_line)); 465 strncpy(we->we_utmp.out_name, ut->ut_user, 466 sizeof(we->we_utmp.out_name)); 467 we->we_utmp.out_time = 468 htonl(_time_to_time32(ut->ut_tv.tv_sec)); 469 we++; 470 } 471 endutxent(); 472 473 if (chdir(_PATH_DEV) < 0) { 474 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 475 exit(1); 476 } 477 wend = we; 478 for (we = mywd.wd_we; we < wend; we++) { 479 if (stat(we->we_utmp.out_line, &stb) >= 0) 480 we->we_idle = htonl(now - stb.st_atime); 481 we++; 482 } 483 (void) getloadavg(avenrun, 484 sizeof(avenrun) / sizeof(avenrun[0])); 485 for (i = 0; i < 3; i++) 486 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 487 cc = (char *)wend - (char *)&mywd; 488 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 489 mywd.wd_vers = WHODVERSION; 490 mywd.wd_type = WHODTYPE_STATUS; 491 if (multicast_mode == SCOPED_MULTICAST) { 492 (void) sendto(s, (char *)&mywd, cc, 0, 493 (struct sockaddr *)&multicast_addr, 494 sizeof(multicast_addr)); 495 } else { 496 for (np = neighbors; np != NULL; np = np->n_next) { 497 if (multicast_mode == PER_INTERFACE_MULTICAST && 498 (np->n_flags & IFF_MULTICAST) != 0) { 499 /* 500 * Select the outgoing interface for the 501 * multicast. 502 */ 503 if (setsockopt(s, IPPROTO_IP, 504 IP_MULTICAST_IF, 505 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 506 sizeof(struct in_addr)) < 0) { 507 syslog(LOG_ERR, 508 "setsockopt IP_MULTICAST_IF: %m"); 509 exit(1); 510 } 511 (void) sendto(s, (char *)&mywd, cc, 0, 512 (struct sockaddr *)&multicast_addr, 513 sizeof(multicast_addr)); 514 } else { 515 (void) sendto(s, (char *)&mywd, cc, 0, 516 np->n_addr, np->n_addrlen); 517 } 518 } 519 } 520 if (chdir(_PATH_RWHODIR) < 0) { 521 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 522 exit(1); 523 } 524 if (waitpid(pid_child_receiver, &status, WNOHANG) == 525 pid_child_receiver) { 526 break; 527 } 528 sleep(SL_INTERVAL); 529 } 530} 531 532void 533getboottime(int signo __unused) 534{ 535 int mib[2]; 536 size_t size; 537 struct timeval tm; 538 539 mib[0] = CTL_KERN; 540 mib[1] = KERN_BOOTTIME; 541 size = sizeof(tm); 542 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 543 syslog(LOG_ERR, "cannot get boottime: %m"); 544 exit(1); 545 } 546 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 547} 548 549void 550quit(const char *msg) 551{ 552 553 syslog(LOG_ERR, "%s", msg); 554 exit(1); 555} 556 557void 558rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 559{ 560 struct sockaddr *sa; 561 int i; 562 563 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 564 for (i = 0; i < RTAX_MAX && cp < cplim; i++) { 565 if ((rtinfo->rti_addrs & (1 << i)) == 0) 566 continue; 567 sa = (struct sockaddr *)cp; 568 rtinfo->rti_info[i] = sa; 569 cp += SA_SIZE(sa); 570 } 571} 572 573/* 574 * Figure out device configuration and select 575 * networks which deserve status information. 576 */ 577int 578configure(int so) 579{ 580 struct neighbor *np; 581 struct if_msghdr *ifm; 582 struct ifa_msghdr *ifam; 583 struct sockaddr_dl *sdl; 584 size_t needed; 585 int mib[6], flags, lflags, len; 586 char *buf, *lim, *next; 587 struct rt_addrinfo info; 588 589 flags = 0; 590 if (multicast_mode != NO_MULTICAST) { 591 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 592 multicast_addr.sin_port = sp->s_port; 593 } 594 595 if (multicast_mode == SCOPED_MULTICAST) { 596 struct ip_mreq mreq; 597 unsigned char ttl; 598 599 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 600 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 601 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP, 602 &mreq, sizeof(mreq)) < 0) { 603 syslog(LOG_ERR, 604 "setsockopt IP_ADD_MEMBERSHIP: %m"); 605 return (0); 606 } 607 ttl = multicast_scope; 608 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, 609 sizeof(ttl)) < 0) { 610 syslog(LOG_ERR, 611 "setsockopt IP_MULTICAST_TTL: %m"); 612 return (0); 613 } 614 return (1); 615 } 616 617 mib[0] = CTL_NET; 618 mib[1] = PF_ROUTE; 619 mib[2] = 0; 620 mib[3] = AF_INET; 621 mib[4] = NET_RT_IFLIST; 622 mib[5] = 0; 623 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 624 quit("route-sysctl-estimate"); 625 if ((buf = malloc(needed)) == NULL) 626 quit("malloc"); 627 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 628 quit("actual retrieval of interface table"); 629 lim = buf + needed; 630 631 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 632 for (next = buf; next < lim; next += ifm->ifm_msglen) { 633 ifm = (struct if_msghdr *)next; 634 if (ifm->ifm_type == RTM_IFINFO) { 635 sdl = (struct sockaddr_dl *)(ifm + 1); 636 flags = ifm->ifm_flags; 637 continue; 638 } 639 if ((flags & IFF_UP) == 0) 640 continue; 641 lflags = IFF_BROADCAST | iff_flag; 642 if (multicast_mode == PER_INTERFACE_MULTICAST) 643 lflags |= IFF_MULTICAST; 644 if ((flags & lflags) == 0) 645 continue; 646 if (ifm->ifm_type != RTM_NEWADDR) 647 quit("out of sync parsing NET_RT_IFLIST"); 648 ifam = (struct ifa_msghdr *)ifm; 649 info.rti_addrs = ifam->ifam_addrs; 650 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 651 &info); 652 /* gag, wish we could get rid of Internet dependencies */ 653#define dstaddr info.rti_info[RTAX_BRD] 654#define ifaddr info.rti_info[RTAX_IFA] 655#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 656#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 657 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 658 continue; 659 PORT_SA(dstaddr) = sp->s_port; 660 for (np = neighbors; np != NULL; np = np->n_next) { 661 if (memcmp(sdl->sdl_data, np->n_name, 662 sdl->sdl_nlen) == 0 && 663 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) { 664 break; 665 } 666 } 667 if (np != NULL) 668 continue; 669 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 670 np = malloc(len); 671 if (np == NULL) 672 quit("malloc of neighbor structure"); 673 memset(np, 0, len); 674 np->n_flags = flags; 675 np->n_addr = (struct sockaddr *)(np + 1); 676 np->n_addrlen = dstaddr->sa_len; 677 np->n_name = np->n_addrlen + (char *)np->n_addr; 678 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 679 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 680 if (multicast_mode == PER_INTERFACE_MULTICAST && 681 (flags & IFF_MULTICAST) != 0 && 682 (flags & IFF_LOOPBACK) == 0) { 683 struct ip_mreq mreq; 684 685 memcpy((char *)np->n_addr, (char *)ifaddr, 686 np->n_addrlen); 687 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 688 mreq.imr_interface.s_addr = 689 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 690 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 691 &mreq, sizeof(mreq)) < 0) { 692 syslog(LOG_ERR, 693 "setsockopt IP_ADD_MEMBERSHIP: %m"); 694#if 0 695 /* Fall back to broadcast on this if. */ 696 np->n_flags &= ~IFF_MULTICAST; 697#else 698 free(np); 699 continue; 700#endif 701 } 702 } 703 np->n_next = neighbors; 704 neighbors = np; 705 } 706 free(buf); 707 return (1); 708} 709 710#ifdef DEBUG 711void 712Sendto(int s, const void *buf, size_t cc, int flags, const struct sockaddr *to, 713 int tolen) 714{ 715 struct whod *w; 716 struct whoent *we; 717 struct sockaddr_in *sin; 718 719 w = (struct whod *)buf; 720 sin = (struct sockaddr_in *)to; 721 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 722 ntohs(sin->sin_port)); 723 printf("hostname %s %s\n", w->wd_hostname, 724 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 725 printf("load %4.2f, %4.2f, %4.2f\n", 726 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 727 ntohl(w->wd_loadav[2]) / 100.0); 728 cc -= WHDRSIZE; 729 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 730 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time)); 731 732 printf("%-8.8s %s:%s %.12s", we->we_utmp.out_name, 733 w->wd_hostname, we->we_utmp.out_line, ctime(&t) + 4); 734 we->we_idle = ntohl(we->we_idle) / 60; 735 if (we->we_idle != 0) { 736 if (we->we_idle >= 100 * 60) 737 we->we_idle = 100 * 60 - 1; 738 if (we->we_idle >= 60) 739 printf(" %2d", we->we_idle / 60); 740 else 741 printf(" "); 742 printf(":%02d", we->we_idle % 60); 743 } 744 printf("\n"); 745 } 746} 747 748char * 749interval(int time, char *updown) 750{ 751 static char resbuf[32]; 752 int days, hours, minutes; 753 754 if (time < 0 || time > 3 * 30 * 24 * 60 * 60) { 755 (void) sprintf(resbuf, " %s ??:??", updown); 756 return (resbuf); 757 } 758 minutes = (time + 59) / 60; /* round to minutes */ 759 hours = minutes / 60; 760 minutes %= 60; 761 days = hours / 24; 762 hours %= 24; 763 if (days > 0) { 764 (void) sprintf(resbuf, "%s %2d+%02d:%02d", 765 updown, days, hours, minutes); 766 } else { 767 (void) sprintf(resbuf, "%s %2d:%02d", 768 updown, hours, minutes); 769 } 770 return (resbuf); 771} 772#endif 773