1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)rwhod.c 8.1 (Berkeley) 6/6/93 31 * $FreeBSD: src/usr.sbin/rwhod/rwhod.c,v 1.13.2.2 2000/12/23 15:28:12 iedowse Exp $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/socket.h> 36 #include <sys/stat.h> 37 #include <sys/signal.h> 38 #include <sys/ioctl.h> 39 #include <sys/sysctl.h> 40 41 #include <net/if.h> 42 #include <net/if_dl.h> 43 #include <net/route.h> 44 #include <netinet/in.h> 45 #include <arpa/inet.h> 46 #include <protocols/rwhod.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <libutil.h> 53 #include <netdb.h> 54 #include <paths.h> 55 #include <poll.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <syslog.h> 60 #include <timeconv.h> 61 #include <unistd.h> 62 #include <utmpx.h> 63 #include <pwd.h> 64 #include <grp.h> 65 66 /* 67 * This version of Berkeley's rwhod has been modified to use IP multicast 68 * datagrams, under control of a new command-line option: 69 * 70 * rwhod -m causes rwhod to use IP multicast (instead of 71 * broadcast or unicast) on all interfaces that have 72 * the IFF_MULTICAST flag set in their "ifnet" structs 73 * (excluding the loopback interface). The multicast 74 * reports are sent with a time-to-live of 1, to prevent 75 * forwarding beyond the directly-connected subnet(s). 76 * 77 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 78 * time-to-live of <ttl>, via a SINGLE interface rather 79 * than all interfaces. <ttl> must be between 0 and 80 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 81 * is different than "-m", in that "-m 1" specifies 82 * transmission on one interface only. 83 * 84 * When "-m" is used without a <ttl> argument, the program accepts multicast 85 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 86 * is given, it accepts multicast reports from only one interface, the one 87 * on which reports are sent (which may be controlled via the host's routing 88 * table). Regardless of the "-m" option, the program accepts broadcast or 89 * unicast reports from all interfaces. Thus, this program will hear the 90 * reports of old, non-multicasting rwhods, but, if multicasting is used, 91 * those old rwhods won't hear the reports generated by this program. 92 * 93 * -- Steve Deering, Stanford University, February 1989 94 */ 95 96 #define UNPRIV_USER "daemon" 97 #define UNPRIV_GROUP "daemon" 98 99 #define WITH_ERRNO 1 /* Write to syslog with errno (%m) */ 100 #define WITHOUT_ERRNO 0 /* Write to syslog without errno */ 101 102 #define NO_MULTICAST 0 /* multicast modes */ 103 #define PER_INTERFACE_MULTICAST 1 104 #define SCOPED_MULTICAST 2 105 106 #define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 107 108 #define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 109 /* (belongs in protocols/rwhod.h) */ 110 111 static int insecure_mode; 112 static int quiet_mode; 113 static int iff_flag = IFF_POINTOPOINT; 114 static int multicast_mode = NO_MULTICAST; 115 static int multicast_scope; 116 static struct sockaddr_in multicast_addr; 117 118 static char myname[MAXHOSTNAMELEN]; 119 120 /* 121 * We communicate with each neighbor in a list constructed at the time we're 122 * started up. Neighbors are currently directly connected via a hardware 123 * interface. 124 */ 125 struct neighbor { 126 struct neighbor *n_next; 127 char *n_name; /* interface name */ 128 struct sockaddr *n_addr; /* who to send to */ 129 int n_addrlen; /* size of address */ 130 int n_flags; /* should forward?, interface flags */ 131 }; 132 133 static struct neighbor *neighbors; 134 static struct whod mywd; 135 static struct servent *sp; 136 static int s; 137 static volatile sig_atomic_t onsighup; 138 139 #define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we)) 140 141 static void run_as(uid_t *, gid_t *); 142 static int configure(int); 143 static void getboottime(void); 144 static void send_host_information(void); 145 static void hup(int); 146 static void quit(const char *, int) __dead2; 147 static void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 148 static int verify(char *, int); 149 static void handleread(int); 150 static void usage(void) __dead2; 151 static void timeadd(struct timeval *, time_t, struct timeval *); 152 153 #ifdef DEBUG 154 static char *interval(int, const char *); 155 static ssize_t Sendto(int, const void *, size_t, int, 156 const struct sockaddr *, int); 157 #else 158 #define Sendto sendto 159 #endif 160 161 int 162 main(int argc, char *argv[]) 163 { 164 struct pollfd pfd[1]; 165 char *ep, *cp; 166 int on = 1; 167 int send_time = 180; /* Default time, 180 seconds (3 minutes) */ 168 struct sockaddr_in m_sin; 169 uid_t unpriv_uid; 170 gid_t unpriv_gid; 171 long tmp; 172 time_t delta = 0; 173 struct timeval next = { .tv_sec = 0 }, now; 174 175 if (getuid()) 176 errx(1, "not super user"); 177 178 run_as(&unpriv_uid, &unpriv_gid); 179 180 argv++; argc--; 181 while (argc > 0 && *argv[0] == '-') { 182 if (strcmp(*argv, "-m") == 0) { 183 if (argc > 1 && *(argv + 1)[0] != '-') { 184 /* Argument has been given */ 185 argv++, argc--; 186 multicast_mode = SCOPED_MULTICAST; 187 tmp = strtol(*argv, &ep, 10); 188 if (*ep != '\0' || tmp < INT_MIN || tmp > INT_MAX) 189 errx(1, "invalid ttl: %s", *argv); 190 multicast_scope = (int)tmp; 191 if (multicast_scope > MAX_MULTICAST_SCOPE) 192 errx(1, "ttl must not exceed %u", 193 MAX_MULTICAST_SCOPE); 194 } 195 else multicast_mode = PER_INTERFACE_MULTICAST; 196 } else if (strcmp(*argv, "-g") == 0) { 197 if (argc > 1 && *(argv + 1)[0] != '-') { 198 argv++, argc--; 199 send_time = (int)strtol(*argv, &ep, 10); 200 if (send_time <= 0) 201 errx(1, "time must be greater than 0"); 202 203 if (ep[0] != '\0') { 204 if (ep[1] != '\0') 205 errx(1, "invalid argument: %s", *argv); 206 if (*ep == 'M' || *ep == 'm') { 207 /* Time in minutes. */ 208 send_time *= 60; 209 } else 210 errx(1, "invalid argument: %s", *argv); 211 } 212 213 if (send_time > 180) 214 errx(1, "cannot be greater than 180 seconds (3 minutes)"); 215 } else 216 errx(1, "missing argument"); 217 } else if (strcmp(*argv, "-i") == 0) 218 insecure_mode = 1; 219 else if (strcmp(*argv, "-l") == 0) 220 quiet_mode = 1; 221 else if (strcmp(*argv, "-p") == 0) 222 iff_flag = 0; 223 else 224 usage(); 225 argv++, argc--; 226 } 227 if (argc > 0) 228 usage(); 229 #ifndef DEBUG 230 struct pidfh *pfh = NULL; 231 pfh = pidfile_open(NULL, 600, NULL); 232 daemon(1, 0); 233 pidfile_write(pfh); 234 #endif 235 signal(SIGHUP, hup); 236 openlog("rwhod", LOG_PID, LOG_DAEMON); 237 sp = getservbyname("who", "udp"); 238 if (sp == NULL) 239 quit("udp/who: unknown service", WITHOUT_ERRNO); 240 241 if (chdir(_PATH_RWHODIR) < 0) 242 quit(_PATH_RWHODIR, WITH_ERRNO); 243 244 /* 245 * Establish host name as returned by system. 246 */ 247 if (gethostname(myname, sizeof(myname)) < 0) 248 quit("gethostname", WITH_ERRNO); 249 250 if ((cp = strchr(myname, '.')) != NULL) 251 *cp = '\0'; 252 strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname)); 253 getboottime(); 254 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 255 quit("socket", WITH_ERRNO); 256 257 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) 258 quit("setsockopt SO_BROADCAST", WITH_ERRNO); 259 260 memset(&m_sin, 0, sizeof(m_sin)); 261 m_sin.sin_len = sizeof(m_sin); 262 m_sin.sin_family = AF_INET; 263 m_sin.sin_port = sp->s_port; 264 if (bind(s, (struct sockaddr *)&m_sin, sizeof(m_sin)) < 0) 265 quit("bind", WITH_ERRNO); 266 267 setgid(unpriv_gid); 268 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 269 setuid(unpriv_uid); 270 if (!configure(s)) 271 exit(1); 272 273 if (!quiet_mode) { 274 send_host_information(); 275 delta = send_time; 276 gettimeofday(&now, NULL); 277 timeadd(&now, delta, &next); 278 } 279 280 pfd[0].fd = s; 281 pfd[0].events = POLLIN; 282 283 for (;;) { 284 int n; 285 286 n = poll(pfd, 1, 1000); 287 288 if (onsighup) { 289 onsighup = 0; 290 getboottime(); 291 } 292 293 if (n == 1) 294 handleread(s); 295 if (!quiet_mode) { 296 gettimeofday(&now, NULL); 297 if (now.tv_sec > next.tv_sec) { 298 send_host_information(); 299 timeadd(&now, delta, &next); 300 } 301 } 302 } 303 } 304 305 static void 306 timeadd(struct timeval *now, time_t delta, struct timeval *next) 307 { 308 (next)->tv_sec = (now)->tv_sec + delta; 309 } 310 311 static void 312 handleread(int sock) 313 { 314 struct sockaddr_in from; 315 struct stat st; 316 char path[64]; 317 struct whod wd; 318 int cc, whod; 319 socklen_t len = sizeof(from); 320 321 cc = recvfrom(sock, (char *)&wd, sizeof(struct whod), 0, 322 (struct sockaddr *)&from, &len); 323 if (cc == 0) 324 return; 325 326 if (cc < 0 && errno != EINTR) { 327 syslog(LOG_WARNING, "recv: %m"); 328 return; 329 } 330 331 if (from.sin_port != sp->s_port && !insecure_mode) { 332 syslog(LOG_WARNING, "%d: bad source port from %s", 333 ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 334 return; 335 } 336 if (cc < (int)WHDRSIZE) { 337 syslog(LOG_WARNING, "short packet from %s", 338 inet_ntoa(from.sin_addr)); 339 return; 340 } 341 if (wd.wd_vers != WHODVERSION) 342 return; 343 if (wd.wd_type != WHODTYPE_STATUS) 344 return; 345 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 346 syslog(LOG_WARNING, "malformed host name from %s", 347 inet_ntoa(from.sin_addr)); 348 return; 349 } 350 snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 351 /* 352 * Rather than truncating and growing the file each time, 353 * use ftruncate if size is less than previous size. 354 */ 355 whod = open(path, O_WRONLY | O_CREAT, 0644); 356 if (whod < 0) { 357 syslog(LOG_WARNING, "%s: %m", path); 358 return; 359 } 360 #if _BYTE_ORDER != _BIG_ENDIAN 361 { 362 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 363 struct whoent *we; 364 365 /* undo header byte swapping before writing to file */ 366 wd.wd_sendtime = ntohl(wd.wd_sendtime); 367 for (i = 0; i < 3; i++) 368 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 369 wd.wd_boottime = ntohl(wd.wd_boottime); 370 we = wd.wd_we; 371 for (i = 0; i < n; i++) { 372 we->we_idle = ntohl(we->we_idle); 373 we->we_utmp.out_time = 374 ntohl(we->we_utmp.out_time); 375 we++; 376 } 377 } 378 #endif 379 wd.wd_recvtime = time(NULL); 380 write(whod, (char *)&wd, cc); 381 if (fstat(whod, &st) < 0 || st.st_size > cc) 382 ftruncate(whod, cc); 383 close(whod); 384 } 385 386 static void 387 usage(void) 388 { 389 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 390 exit(1); 391 } 392 393 static void 394 hup(int signo __unused) 395 { 396 onsighup = 1; 397 } 398 399 static void 400 run_as(uid_t *uid, gid_t *gid) 401 { 402 struct passwd *pw; 403 struct group *gr; 404 405 pw = getpwnam(UNPRIV_USER); 406 if (!pw) 407 quit("getpwnam(daemon)", WITH_ERRNO); 408 409 *uid = pw->pw_uid; 410 411 gr = getgrnam(UNPRIV_GROUP); 412 if (!gr) 413 quit("getgrnam(daemon)", WITH_ERRNO); 414 415 *gid = gr->gr_gid; 416 } 417 418 /* 419 * Check out host name for unprintables 420 * and other funnies before allowing a file 421 * to be created. Sorry, but blanks aren't allowed. 422 */ 423 static int 424 verify(char *name, int maxlen) 425 { 426 int size = 0; 427 428 while (*name && size < maxlen - 1) { 429 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 430 return (0); 431 name++, size++; 432 } 433 *name = '\0'; 434 return (size > 0); 435 } 436 437 static void 438 send_host_information(void) 439 { 440 struct neighbor *np; 441 struct whoent *we = mywd.wd_we, *wend; 442 struct stat stb; 443 struct utmpx *ut; 444 static int alarmcount = 0; 445 double avenrun[3]; 446 time_t now; 447 int i, cc; 448 449 now = time(NULL); 450 if (alarmcount % 10 == 0) 451 getboottime(); 452 alarmcount++; 453 wend = &mywd.wd_we[1024 / sizeof(struct whoent)]; 454 setutxent(); 455 while ((ut = getutxent()) != NULL && we < wend) { 456 if (ut->ut_type != USER_PROCESS) 457 continue; 458 strncpy(we->we_utmp.out_line, ut->ut_line, 459 sizeof(we->we_utmp.out_line)); 460 strncpy(we->we_utmp.out_name, ut->ut_user, 461 sizeof(we->we_utmp.out_name)); 462 we->we_utmp.out_time = 463 htonl(_time_to_time32(ut->ut_tv.tv_sec)); 464 we++; 465 } 466 endutxent(); 467 468 if (chdir(_PATH_DEV)) { 469 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 470 exit(1); 471 } 472 473 wend = we; 474 for (we = mywd.wd_we; we < wend; we++) { 475 if (stat(we->we_utmp.out_line, &stb) >= 0) 476 we->we_idle = htonl(now - stb.st_atime); 477 } 478 getloadavg(avenrun, NELEM(avenrun)); 479 for (i = 0; i < 3; i++) 480 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 481 cc = (char *)wend - (char *)&mywd; 482 mywd.wd_sendtime = htonl(time(0)); 483 mywd.wd_vers = WHODVERSION; 484 mywd.wd_type = WHODTYPE_STATUS; 485 if (multicast_mode == SCOPED_MULTICAST) { 486 Sendto(s, (char *)&mywd, cc, 0, 487 (struct sockaddr *)&multicast_addr, 488 sizeof(multicast_addr)); 489 } 490 else for (np = neighbors; np != NULL; np = np->n_next) { 491 if (multicast_mode == PER_INTERFACE_MULTICAST && 492 np->n_flags & IFF_MULTICAST) { 493 /* 494 * Select the outgoing interface for the multicast. 495 */ 496 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 497 &(((struct sockaddr_in *)np->n_addr)->sin_addr), 498 sizeof(struct in_addr)) < 0) { 499 quit("setsockopt IP_MULTICAST_IF", WITH_ERRNO); 500 } 501 Sendto(s, (char *)&mywd, cc, 0, 502 (struct sockaddr *)&multicast_addr, 503 sizeof(multicast_addr)); 504 } else Sendto(s, (char *)&mywd, cc, 0, 505 np->n_addr, np->n_addrlen); 506 } 507 if (chdir(_PATH_RWHODIR)) { 508 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 509 exit(1); 510 } 511 } 512 513 static void 514 getboottime(void) 515 { 516 struct timespec uts; 517 518 clock_gettime(CLOCK_UPTIME, &uts); 519 mywd.wd_boottime = htonl(time(NULL) - uts.tv_sec); 520 } 521 522 /* 523 * If wrterrno == WITH_ERRNO, we will print 524 * errno. If not, we leave errno out. 525 */ 526 static void 527 quit(const char *msg, int wrterrno) 528 { 529 if (wrterrno) 530 syslog(LOG_ERR, "%s: %m", msg); 531 else 532 syslog(LOG_ERR, "%s", msg); 533 exit(1); 534 } 535 536 static void 537 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo) 538 { 539 struct sockaddr *sa; 540 int i; 541 542 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 543 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 544 if ((rtinfo->rti_addrs & (1 << i)) == 0) 545 continue; 546 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 547 RT_ADVANCE(cp, sa); 548 } 549 } 550 551 /* 552 * Figure out device configuration and select 553 * networks which deserve status information. 554 */ 555 static int 556 configure(int c_sock) 557 { 558 struct neighbor *np; 559 struct if_msghdr *ifm; 560 struct ifa_msghdr *ifam; 561 struct sockaddr_dl *sdl; 562 size_t needed; 563 int mib[6], flags = 0, len; 564 char *buf, *lim, *next; 565 struct rt_addrinfo info; 566 567 if (multicast_mode != NO_MULTICAST) { 568 multicast_addr.sin_len = sizeof(multicast_addr); 569 multicast_addr.sin_family = AF_INET; 570 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 571 multicast_addr.sin_port = sp->s_port; 572 } 573 574 if (multicast_mode == SCOPED_MULTICAST) { 575 struct ip_mreq mreq; 576 unsigned char ttl; 577 578 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 579 mreq.imr_interface.s_addr = htonl(INADDR_ANY); 580 if (setsockopt(c_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, 581 &mreq, sizeof(mreq)) < 0) { 582 syslog(LOG_ERR, 583 "setsockopt IP_ADD_MEMBERSHIP: %m"); 584 return(0); 585 } 586 ttl = multicast_scope; 587 if (setsockopt(c_sock, IPPROTO_IP, IP_MULTICAST_TTL, 588 &ttl, sizeof(ttl)) < 0) { 589 syslog(LOG_ERR, 590 "setsockopt IP_MULTICAST_TTL: %m"); 591 return(0); 592 } 593 return(1); 594 } 595 596 mib[0] = CTL_NET; 597 mib[1] = PF_ROUTE; 598 mib[2] = 0; 599 mib[3] = AF_INET; 600 mib[4] = NET_RT_IFLIST; 601 mib[5] = 0; 602 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 603 quit("route-sysctl-estimate", WITH_ERRNO); 604 if ((buf = malloc(needed)) == NULL) 605 quit("malloc", WITH_ERRNO); 606 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 607 quit("actual retrieval of interface table", WITH_ERRNO); 608 lim = buf + needed; 609 610 sdl = NULL; /* XXX just to keep gcc -Wall happy */ 611 for (next = buf; next < lim; next += ifm->ifm_msglen) { 612 ifm = (struct if_msghdr *)next; 613 if (ifm->ifm_type == RTM_IFINFO) { 614 sdl = (struct sockaddr_dl *)(ifm + 1); 615 flags = ifm->ifm_flags; 616 continue; 617 } 618 if ((flags & IFF_UP) == 0 || 619 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 620 IFF_MULTICAST : 0) | 621 IFF_BROADCAST|iff_flag)) == 0) 622 continue; 623 if (ifm->ifm_type != RTM_NEWADDR) 624 quit("out of sync parsing NET_RT_IFLIST", WITHOUT_ERRNO); 625 ifam = (struct ifa_msghdr *)ifm; 626 info.rti_addrs = ifam->ifam_addrs; 627 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 628 &info); 629 /* gag, wish we could get rid of Internet dependencies */ 630 #define dstaddr info.rti_info[RTAX_BRD] 631 #define ifaddr info.rti_info[RTAX_IFA] 632 #define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 633 #define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 634 if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 635 continue; 636 PORT_SA(dstaddr) = sp->s_port; 637 for (np = neighbors; np != NULL; np = np->n_next) 638 if (memcmp(sdl->sdl_data, np->n_name, 639 sdl->sdl_nlen) == 0 && 640 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 641 break; 642 if (np != NULL) 643 continue; 644 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 645 np = (struct neighbor *)malloc(len); 646 if (np == NULL) 647 quit("malloc of neighbor structure", WITH_ERRNO); 648 memset(np, 0, len); 649 np->n_flags = flags; 650 np->n_addr = (struct sockaddr *)(np + 1); 651 np->n_addrlen = dstaddr->sa_len; 652 np->n_name = np->n_addrlen + (char *)np->n_addr; 653 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 654 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 655 if (multicast_mode == PER_INTERFACE_MULTICAST && 656 (flags & IFF_MULTICAST) && 657 !(flags & IFF_LOOPBACK)) { 658 struct ip_mreq mreq; 659 660 memcpy((char *)np->n_addr, (char *)ifaddr, 661 np->n_addrlen); 662 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 663 mreq.imr_interface.s_addr = 664 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 665 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 666 &mreq, sizeof(mreq)) < 0) { 667 syslog(LOG_ERR, 668 "setsockopt IP_ADD_MEMBERSHIP: %m"); 669 #if 0 670 /* Fall back to broadcast on this if. */ 671 np->n_flags &= ~IFF_MULTICAST; 672 #else 673 free((char *)np); 674 continue; 675 #endif 676 } 677 } 678 np->n_next = neighbors; 679 neighbors = np; 680 } 681 free(buf); 682 return (1); 683 } 684 685 #ifdef DEBUG 686 static ssize_t 687 Sendto(int s_debug, const void *buf, size_t cc, int flags, 688 const struct sockaddr *to, int tolen) 689 { 690 const struct whod *w = (const struct whod *)buf; 691 const struct whoent *we; 692 const struct sockaddr_in *sock_in = (const struct sockaddr_in *)to; 693 ssize_t ret; 694 int idle_time; 695 696 ret = sendto(s_debug, buf, cc, flags, to, tolen); 697 698 printf("sendto %s:%d\n", inet_ntoa(sock_in->sin_addr), 699 ntohs(sock_in->sin_port)); 700 printf("hostname %s %s\n", w->wd_hostname, 701 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 702 printf("load %4.2f, %4.2f, %4.2f\n", 703 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 704 ntohl(w->wd_loadav[2]) / 100.0); 705 cc -= WHDRSIZE; 706 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 707 time_t t = ntohl(we->we_utmp.out_time); 708 idle_time = we->we_idle; 709 printf("%-8.8s %s:%s %.12s", 710 we->we_utmp.out_name, 711 w->wd_hostname, we->we_utmp.out_line, 712 ctime(&t)+4); 713 idle_time = ntohl(we->we_idle) / 60; 714 if (idle_time) { 715 if (idle_time >= 100*60) 716 idle_time = 100*60 - 1; 717 if (idle_time >= 60) 718 printf(" %2d", idle_time / 60); 719 else 720 printf(" "); 721 printf(":%02d", idle_time % 60); 722 } 723 printf("\n"); 724 } 725 return(ret); 726 } 727 728 static char * 729 interval(int inter_time, const char *updown) 730 { 731 static char resbuf[32]; 732 int days, hours, minutes; 733 734 if (inter_time < 0 || inter_time > 3*30*24*60*60) { 735 snprintf(resbuf, sizeof(resbuf), " %s ??:??", updown); 736 return (resbuf); 737 } 738 minutes = (inter_time + 59) / 60; /* round to minutes */ 739 hours = minutes / 60; minutes %= 60; 740 days = hours / 24; hours %= 24; 741 if (days) 742 snprintf(resbuf, sizeof(resbuf), "%s %2d+%02d:%02d", 743 updown, days, hours, minutes); 744 else 745 snprintf(resbuf, sizeof(resbuf), "%s %2d:%02d", 746 updown, hours, minutes); 747 return (resbuf); 748 } 749 #endif 750