rwhod.c revision 128186
1185377Ssam/* 2187831Ssam * Copyright (c) 1983, 1993 3185377Ssam * The Regents of the University of California. All rights reserved. 4185377Ssam * 5185377Ssam * Redistribution and use in source and binary forms, with or without 6185377Ssam * modification, are permitted provided that the following conditions 7185377Ssam * are met: 8185377Ssam * 1. Redistributions of source code must retain the above copyright 9185377Ssam * notice, this list of conditions and the following disclaimer. 10185377Ssam * 2. Redistributions in binary form must reproduce the above copyright 11185377Ssam * notice, this list of conditions and the following disclaimer in the 12185377Ssam * documentation and/or other materials provided with the distribution. 13185377Ssam * 3. All advertising materials mentioning features or use of this software 14185377Ssam * must display the following acknowledgement: 15185377Ssam * This product includes software developed by the University of 16185377Ssam * California, Berkeley and its contributors. 17185907Ssam * 4. Neither the name of the University nor the names of its contributors 18185377Ssam * may be used to endorse or promote products derived from this software 19185377Ssam * without specific prior written permission. 20185377Ssam * 21185377Ssam * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22185377Ssam * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23185377Ssam * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24185377Ssam * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25185377Ssam * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26185377Ssam * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27185377Ssam * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28185377Ssam * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29185377Ssam * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30185377Ssam * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31185377Ssam * SUCH DAMAGE. 32185377Ssam */ 33185377Ssam 34185377Ssam#ifndef lint 35185377Ssamstatic const char copyright[] = 36185377Ssam"@(#) Copyright (c) 1983, 1993\n\ 37185377Ssam The Regents of the University of California. All rights reserved.\n"; 38185377Ssam#endif /* not lint */ 39185377Ssam 40185377Ssam#if 0 41185377Ssam#ifndef lint 42185377Ssamstatic char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; 43185377Ssam#endif /* not lint */ 44185377Ssam#endif 45185377Ssam 46185377Ssam#include <sys/cdefs.h> 47185377Ssam__FBSDID("$FreeBSD: head/usr.sbin/rwhod/rwhod.c 128186 2004-04-13 11:24:43Z luigi $"); 48185377Ssam 49185377Ssam#include <sys/param.h> 50185377Ssam#include <sys/socket.h> 51185377Ssam#include <sys/stat.h> 52185377Ssam#include <sys/signal.h> 53185377Ssam#include <sys/ioctl.h> 54185377Ssam#include <sys/sysctl.h> 55185377Ssam 56185377Ssam#include <net/if.h> 57185377Ssam#include <net/if_dl.h> 58185377Ssam#include <net/route.h> 59185377Ssam#include <netinet/in.h> 60185377Ssam#include <arpa/inet.h> 61185377Ssam#include <protocols/rwhod.h> 62185377Ssam 63185377Ssam#include <ctype.h> 64185377Ssam#include <err.h> 65185377Ssam#include <errno.h> 66185377Ssam#include <fcntl.h> 67185377Ssam#include <netdb.h> 68185377Ssam#include <paths.h> 69185377Ssam#include <stdio.h> 70185377Ssam#include <stdlib.h> 71185377Ssam#include <string.h> 72185377Ssam#include <syslog.h> 73185377Ssam#include <timeconv.h> 74185377Ssam#include <unistd.h> 75185377Ssam#include <utmp.h> 76185380Ssam#include <pwd.h> 77185380Ssam#include <grp.h> 78185380Ssam 79185380Ssam/* 80185380Ssam * This version of Berkeley's rwhod has been modified to use IP multicast 81185380Ssam * datagrams, under control of a new command-line option: 82185380Ssam * 83185380Ssam * rwhod -m causes rwhod to use IP multicast (instead of 84185380Ssam * broadcast or unicast) on all interfaces that have 85185380Ssam * the IFF_MULTICAST flag set in their "ifnet" structs 86185380Ssam * (excluding the loopback interface). The multicast 87185380Ssam * reports are sent with a time-to-live of 1, to prevent 88185380Ssam * forwarding beyond the directly-connected subnet(s). 89185380Ssam * 90185380Ssam * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a 91185380Ssam * time-to-live of <ttl>, via a SINGLE interface rather 92185380Ssam * than all interfaces. <ttl> must be between 0 and 93185380Ssam * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1" 94185380Ssam * is different than "-m", in that "-m 1" specifies 95185380Ssam * transmission on one interface only. 96185380Ssam * 97185380Ssam * When "-m" is used without a <ttl> argument, the program accepts multicast 98185380Ssam * rwhod reports from all multicast-capable interfaces. If a <ttl> argument 99185380Ssam * is given, it accepts multicast reports from only one interface, the one 100185380Ssam * on which reports are sent (which may be controlled via the host's routing 101185380Ssam * table). Regardless of the "-m" option, the program accepts broadcast or 102185380Ssam * unicast reports from all interfaces. Thus, this program will hear the 103185380Ssam * reports of old, non-multicasting rwhods, but, if multicasting is used, 104185380Ssam * those old rwhods won't hear the reports generated by this program. 105185380Ssam * 106185380Ssam * -- Steve Deering, Stanford University, February 1989 107185380Ssam */ 108185380Ssam 109185377Ssam#define UNPRIV_USER "daemon" 110185377Ssam#define UNPRIV_GROUP "daemon" 111185377Ssam 112185377Ssam#define NO_MULTICAST 0 /* multicast modes */ 113185377Ssam#define PER_INTERFACE_MULTICAST 1 114185377Ssam#define SCOPED_MULTICAST 2 115185377Ssam 116185377Ssam#define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */ 117185377Ssam 118185377Ssam#define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */ 119185377Ssam /* (belongs in protocols/rwhod.h) */ 120185377Ssam 121185377Ssamint insecure_mode; 122185377Ssamint quiet_mode; 123185380Ssamint iff_flag = IFF_POINTOPOINT; 124185380Ssamint multicast_mode = NO_MULTICAST; 125185380Ssamint multicast_scope; 126185380Ssamstruct sockaddr_in multicast_addr = 127185377Ssam { sizeof multicast_addr, AF_INET, 0, { 0 }, { 0 } }; 128185377Ssam 129185377Ssam/* 130185377Ssam * Alarm interval. Don't forget to change the down time check in ruptime 131185377Ssam * if this is changed. 132185377Ssam */ 133185377Ssam#define AL_INTERVAL (3 * 60) 134185377Ssam 135185380Ssamchar myname[MAXHOSTNAMELEN]; 136185380Ssam 137185380Ssam/* 138185380Ssam * We communicate with each neighbor in a list constructed at the time we're 139185377Ssam * started up. Neighbors are currently directly connected via a hardware 140185377Ssam * interface. 141185377Ssam */ 142185377Ssamstruct neighbor { 143185377Ssam struct neighbor *n_next; 144185377Ssam char *n_name; /* interface name */ 145185377Ssam struct sockaddr *n_addr; /* who to send to */ 146185377Ssam int n_addrlen; /* size of address */ 147185377Ssam int n_flags; /* should forward?, interface flags */ 148185377Ssam}; 149185377Ssam 150185377Ssamstruct neighbor *neighbors; 151185377Ssamstruct whod mywd; 152185377Ssamstruct servent *sp; 153185377Ssamint s, utmpf; 154185377Ssam 155185377Ssam#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we)) 156185377Ssam 157185377Ssamvoid run_as(uid_t *, gid_t *); 158185377Ssamint configure(int); 159185377Ssamvoid getboottime(int); 160185377Ssamvoid onalrm(int); 161185377Ssamvoid quit(const char *); 162185377Ssamvoid rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *); 163185377Ssamint verify(char *, int); 164185377Ssamstatic void usage(void); 165185377Ssam#ifdef DEBUG 166185377Ssamchar *interval(int, char *); 167185377Ssamvoid Sendto(int, const void *, size_t, int, const struct sockaddr *, int); 168185377Ssam#define sendto Sendto 169185377Ssam#endif 170185377Ssam 171185377Ssamint 172185377Ssammain(int argc, char *argv[]) 173185377Ssam{ 174185377Ssam struct sockaddr_in from; 175185377Ssam struct stat st; 176185377Ssam char path[64]; 177185377Ssam int on = 1; 178185377Ssam char *cp; 179185377Ssam struct sockaddr_in soin; 180185377Ssam uid_t unpriv_uid; 181185377Ssam gid_t unpriv_gid; 182185377Ssam 183185377Ssam if (getuid()) 184185377Ssam errx(1, "not super user"); 185185377Ssam 186185377Ssam run_as(&unpriv_uid, &unpriv_gid); 187185377Ssam 188185377Ssam argv++; argc--; 189185377Ssam while (argc > 0 && *argv[0] == '-') { 190185377Ssam if (strcmp(*argv, "-m") == 0) { 191185377Ssam if (argc > 1 && isdigit(*(argv + 1)[0])) { 192185377Ssam argv++, argc--; 193185377Ssam multicast_mode = SCOPED_MULTICAST; 194185377Ssam multicast_scope = atoi(*argv); 195185377Ssam if (multicast_scope > MAX_MULTICAST_SCOPE) 196185377Ssam errx(1, "ttl must not exceed %u", 197185377Ssam MAX_MULTICAST_SCOPE); 198185377Ssam } 199185377Ssam else multicast_mode = PER_INTERFACE_MULTICAST; 200185377Ssam } 201185377Ssam else if (strcmp(*argv, "-i") == 0) 202185377Ssam insecure_mode = 1; 203185377Ssam else if (strcmp(*argv, "-l") == 0) 204185377Ssam quiet_mode = 1; 205185377Ssam else if (strcmp(*argv, "-p") == 0) 206185377Ssam iff_flag = 0; 207185377Ssam else 208185377Ssam usage(); 209185377Ssam argv++, argc--; 210185377Ssam } 211185377Ssam if (argc > 0) 212185377Ssam usage(); 213185377Ssam#ifndef DEBUG 214185377Ssam daemon(1, 0); 215185377Ssam#endif 216185377Ssam (void) signal(SIGHUP, getboottime); 217185377Ssam openlog("rwhod", LOG_PID, LOG_DAEMON); 218185377Ssam sp = getservbyname("who", "udp"); 219185377Ssam if (sp == NULL) { 220185377Ssam syslog(LOG_ERR, "who/udp: unknown service"); 221185377Ssam exit(1); 222185377Ssam } 223185377Ssam if (chdir(_PATH_RWHODIR) < 0) { 224185377Ssam syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR); 225185377Ssam exit(1); 226185377Ssam } 227185377Ssam /* 228185377Ssam * Establish host name as returned by system. 229185377Ssam */ 230185377Ssam if (gethostname(myname, sizeof(myname) - 1) < 0) { 231185377Ssam syslog(LOG_ERR, "gethostname: %m"); 232185377Ssam exit(1); 233185377Ssam } 234185377Ssam if ((cp = index(myname, '.')) != NULL) 235185377Ssam *cp = '\0'; 236185377Ssam strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1); 237185377Ssam mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0'; 238185377Ssam utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644); 239185377Ssam if (utmpf < 0) { 240185377Ssam syslog(LOG_ERR, "%s: %m", _PATH_UTMP); 241185377Ssam exit(1); 242185377Ssam } 243185377Ssam getboottime(0); 244185377Ssam if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 245185377Ssam syslog(LOG_ERR, "socket: %m"); 246185377Ssam exit(1); 247185377Ssam } 248185380Ssam if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { 249185380Ssam syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); 250185380Ssam exit(1); 251185380Ssam } 252185377Ssam memset(&soin, 0, sizeof(soin)); 253185377Ssam soin.sin_len = sizeof(soin); 254185377Ssam soin.sin_family = AF_INET; 255185377Ssam soin.sin_port = sp->s_port; 256185377Ssam if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) { 257185377Ssam syslog(LOG_ERR, "bind: %m"); 258185377Ssam exit(1); 259185377Ssam } 260185377Ssam setgid(unpriv_gid); 261185377Ssam setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */ 262185377Ssam setuid(unpriv_uid); 263185377Ssam if (!configure(s)) 264185377Ssam exit(1); 265185377Ssam if (!quiet_mode) { 266185377Ssam signal(SIGALRM, onalrm); 267185377Ssam onalrm(0); 268185377Ssam } 269185377Ssam for (;;) { 270185377Ssam struct whod wd; 271185377Ssam int cc, whod, len = sizeof(from); 272185377Ssam time_t t; 273185377Ssam 274185377Ssam cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, 275185377Ssam (struct sockaddr *)&from, &len); 276185377Ssam if (cc <= 0) { 277185377Ssam if (cc < 0 && errno != EINTR) 278185377Ssam syslog(LOG_WARNING, "recv: %m"); 279185377Ssam continue; 280185377Ssam } 281185377Ssam if (from.sin_port != sp->s_port && !insecure_mode) { 282185377Ssam syslog(LOG_WARNING, "%d: bad source port from %s", 283185377Ssam ntohs(from.sin_port), inet_ntoa(from.sin_addr)); 284185377Ssam continue; 285185377Ssam } 286185377Ssam if (cc < WHDRSIZE) { 287185377Ssam syslog(LOG_WARNING, "short packet from %s", 288185377Ssam inet_ntoa(from.sin_addr)); 289185377Ssam continue; 290185377Ssam } 291185377Ssam if (wd.wd_vers != WHODVERSION) 292185377Ssam continue; 293185377Ssam if (wd.wd_type != WHODTYPE_STATUS) 294185377Ssam continue; 295187831Ssam if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) { 296185377Ssam syslog(LOG_WARNING, "malformed host name from %s", 297185377Ssam inet_ntoa(from.sin_addr)); 298185377Ssam continue; 299185377Ssam } 300187831Ssam (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname); 301185377Ssam /* 302185377Ssam * Rather than truncating and growing the file each time, 303185377Ssam * use ftruncate if size is less than previous size. 304185377Ssam */ 305185377Ssam whod = open(path, O_WRONLY | O_CREAT, 0644); 306185377Ssam if (whod < 0) { 307185377Ssam syslog(LOG_WARNING, "%s: %m", path); 308185377Ssam continue; 309185377Ssam } 310185377Ssam#if ENDIAN != BIG_ENDIAN 311185377Ssam { 312185377Ssam int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); 313185377Ssam struct whoent *we; 314185377Ssam 315185377Ssam /* undo header byte swapping before writing to file */ 316185377Ssam wd.wd_sendtime = ntohl(wd.wd_sendtime); 317185377Ssam for (i = 0; i < 3; i++) 318185377Ssam wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); 319185377Ssam wd.wd_boottime = ntohl(wd.wd_boottime); 320185377Ssam we = wd.wd_we; 321185377Ssam for (i = 0; i < n; i++) { 322185377Ssam we->we_idle = ntohl(we->we_idle); 323185377Ssam we->we_utmp.out_time = 324185377Ssam ntohl(we->we_utmp.out_time); 325185377Ssam we++; 326185377Ssam } 327185377Ssam } 328185377Ssam#endif 329185377Ssam (void) time(&t); 330185377Ssam wd.wd_recvtime = _time_to_int(t); 331185377Ssam (void) write(whod, (char *)&wd, cc); 332185377Ssam if (fstat(whod, &st) < 0 || st.st_size > cc) 333185377Ssam ftruncate(whod, cc); 334185377Ssam (void) close(whod); 335185377Ssam } 336185377Ssam} 337185377Ssam 338185377Ssamstatic void 339185377Ssamusage() 340185377Ssam{ 341185377Ssam fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n"); 342185377Ssam exit(1); 343185377Ssam} 344185377Ssam 345185377Ssamvoid 346185377Ssamrun_as(uid, gid) 347185377Ssam uid_t *uid; 348185377Ssam gid_t *gid; 349185377Ssam{ 350185377Ssam struct passwd *pw; 351185377Ssam struct group *gr; 352185377Ssam 353185377Ssam pw = getpwnam(UNPRIV_USER); 354185377Ssam if (!pw) { 355185377Ssam syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER); 356185377Ssam exit(1); 357185377Ssam } 358185377Ssam *uid = pw->pw_uid; 359185377Ssam 360185377Ssam gr = getgrnam(UNPRIV_GROUP); 361185377Ssam if (!gr) { 362185377Ssam syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP); 363185377Ssam exit(1); 364185377Ssam } 365185377Ssam *gid = gr->gr_gid; 366185377Ssam} 367185377Ssam 368185377Ssam/* 369185377Ssam * Check out host name for unprintables 370185377Ssam * and other funnies before allowing a file 371185377Ssam * to be created. Sorry, but blanks aren't allowed. 372185377Ssam */ 373185377Ssamint 374185377Ssamverify(name, maxlen) 375185377Ssam register char *name; 376185377Ssam register int maxlen; 377185377Ssam{ 378185377Ssam register int size = 0; 379185377Ssam 380185377Ssam while (*name && size < maxlen - 1) { 381185377Ssam if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) 382185377Ssam return (0); 383185377Ssam name++, size++; 384185377Ssam } 385185377Ssam *name = '\0'; 386185377Ssam return (size > 0); 387185377Ssam} 388185377Ssam 389185377Ssamint utmptime; 390185377Ssamint utmpent; 391185377Ssamint utmpsize = 0; 392185377Ssamstruct utmp *utmp; 393185377Ssamint alarmcount; 394185377Ssam 395185377Ssamvoid 396185377Ssamonalrm(signo) 397185377Ssam int signo __unused; 398185377Ssam{ 399185377Ssam register struct neighbor *np; 400185377Ssam register struct whoent *we = mywd.wd_we, *wlast; 401185377Ssam register int i; 402185377Ssam struct stat stb; 403185377Ssam double avenrun[3]; 404185377Ssam time_t now; 405185377Ssam int cc; 406185377Ssam 407185377Ssam now = time(NULL); 408185377Ssam if (alarmcount % 10 == 0) 409185377Ssam getboottime(0); 410185377Ssam alarmcount++; 411185377Ssam (void) fstat(utmpf, &stb); 412185377Ssam if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) { 413185377Ssam utmptime = stb.st_mtime; 414185377Ssam if (stb.st_size > utmpsize) { 415185377Ssam utmpsize = stb.st_size + 10 * sizeof(struct utmp); 416185377Ssam if (utmp) 417185380Ssam utmp = (struct utmp *)realloc(utmp, utmpsize); 418185377Ssam else 419185377Ssam utmp = (struct utmp *)malloc(utmpsize); 420185377Ssam if (! utmp) { 421185380Ssam syslog(LOG_WARNING, "malloc failed"); 422185377Ssam utmpsize = 0; 423185380Ssam goto done; 424187831Ssam } 425185377Ssam } 426187831Ssam (void) lseek(utmpf, (off_t)0, L_SET); 427185380Ssam cc = read(utmpf, (char *)utmp, stb.st_size); 428185380Ssam if (cc < 0) { 429185380Ssam syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP); 430185377Ssam goto done; 431185377Ssam } 432187831Ssam wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1]; 433185377Ssam utmpent = cc / sizeof(struct utmp); 434185377Ssam for (i = 0; i < utmpent; i++) 435185377Ssam if (utmp[i].ut_name[0]) { 436185377Ssam memcpy(we->we_utmp.out_line, utmp[i].ut_line, 437185377Ssam sizeof(utmp[i].ut_line)); 438185377Ssam memcpy(we->we_utmp.out_name, utmp[i].ut_name, 439185377Ssam sizeof(utmp[i].ut_name)); 440185377Ssam we->we_utmp.out_time = htonl(utmp[i].ut_time); 441185377Ssam if (we >= wlast) 442185377Ssam break; 443185377Ssam we++; 444185377Ssam } 445185377Ssam utmpent = we - mywd.wd_we; 446185377Ssam } 447185377Ssam 448185377Ssam /* 449185377Ssam * The test on utmpent looks silly---after all, if no one is 450185377Ssam * logged on, why worry about efficiency?---but is useful on 451185377Ssam * (e.g.) compute servers. 452185377Ssam */ 453185377Ssam if (utmpent && chdir(_PATH_DEV)) { 454187831Ssam syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV); 455185377Ssam exit(1); 456185377Ssam } 457185377Ssam we = mywd.wd_we; 458185377Ssam for (i = 0; i < utmpent; i++) { 459185377Ssam if (stat(we->we_utmp.out_line, &stb) >= 0) 460185377Ssam we->we_idle = htonl(now - stb.st_atime); 461185377Ssam we++; 462185377Ssam } 463185377Ssam (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])); 464185377Ssam for (i = 0; i < 3; i++) 465185377Ssam mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100)); 466185377Ssam cc = (char *)we - (char *)&mywd; 467185377Ssam mywd.wd_sendtime = htonl(_time_to_time32(time(NULL))); 468185377Ssam mywd.wd_vers = WHODVERSION; 469185377Ssam mywd.wd_type = WHODTYPE_STATUS; 470185377Ssam if (multicast_mode == SCOPED_MULTICAST) { 471185377Ssam (void) sendto(s, (char *)&mywd, cc, 0, 472185377Ssam (struct sockaddr *)&multicast_addr, 473185377Ssam sizeof(multicast_addr)); 474185377Ssam } 475185377Ssam else for (np = neighbors; np != NULL; np = np->n_next) { 476185377Ssam if (multicast_mode == PER_INTERFACE_MULTICAST && 477185377Ssam np->n_flags & IFF_MULTICAST) { 478185377Ssam /* 479185377Ssam * Select the outgoing interface for the multicast. 480185377Ssam */ 481185377Ssam if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, 482185377Ssam &(((struct sockaddr_in *)np->n_addr)->sin_addr), 483185377Ssam sizeof(struct in_addr)) < 0) { 484185377Ssam syslog(LOG_ERR, 485185377Ssam "setsockopt IP_MULTICAST_IF: %m"); 486185377Ssam exit(1); 487185377Ssam } 488185377Ssam (void) sendto(s, (char *)&mywd, cc, 0, 489185377Ssam (struct sockaddr *)&multicast_addr, 490185377Ssam sizeof(multicast_addr)); 491185377Ssam } else (void) sendto(s, (char *)&mywd, cc, 0, 492185377Ssam np->n_addr, np->n_addrlen); 493185377Ssam } 494185377Ssam if (utmpent && chdir(_PATH_RWHODIR)) { 495185377Ssam syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); 496185377Ssam exit(1); 497185377Ssam } 498185377Ssamdone: 499185377Ssam (void) alarm(AL_INTERVAL); 500185377Ssam} 501185377Ssam 502185377Ssamvoid 503185377Ssamgetboottime(signo) 504185377Ssam int signo __unused; 505185377Ssam{ 506185377Ssam int mib[2]; 507185377Ssam size_t size; 508185377Ssam struct timeval tm; 509185377Ssam 510185377Ssam mib[0] = CTL_KERN; 511185377Ssam mib[1] = KERN_BOOTTIME; 512185377Ssam size = sizeof(tm); 513185377Ssam if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) { 514185377Ssam syslog(LOG_ERR, "cannot get boottime: %m"); 515185377Ssam exit(1); 516185377Ssam } 517185377Ssam mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec)); 518185377Ssam} 519185377Ssam 520185377Ssamvoid 521185377Ssamquit(msg) 522185377Ssam const char *msg; 523185377Ssam{ 524185377Ssam syslog(LOG_ERR, "%s", msg); 525185377Ssam exit(1); 526185377Ssam} 527185377Ssam 528185377Ssamvoid 529185377Ssamrt_xaddrs(cp, cplim, rtinfo) 530185377Ssam register caddr_t cp, cplim; 531185377Ssam register struct rt_addrinfo *rtinfo; 532185377Ssam{ 533185377Ssam register struct sockaddr *sa; 534185377Ssam register int i; 535185377Ssam 536185377Ssam memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info)); 537185377Ssam for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) { 538185377Ssam if ((rtinfo->rti_addrs & (1 << i)) == 0) 539185377Ssam continue; 540185377Ssam rtinfo->rti_info[i] = sa = (struct sockaddr *)cp; 541185377Ssam cp += SA_SIZE(sa); 542185377Ssam } 543185377Ssam} 544185377Ssam 545185377Ssam/* 546185377Ssam * Figure out device configuration and select 547185377Ssam * networks which deserve status information. 548185377Ssam */ 549185377Ssamint 550185377Ssamconfigure(so) 551185377Ssam int so; 552185377Ssam{ 553185377Ssam register struct neighbor *np; 554185377Ssam register struct if_msghdr *ifm; 555185377Ssam register struct ifa_msghdr *ifam; 556185377Ssam struct sockaddr_dl *sdl; 557185377Ssam size_t needed; 558185377Ssam int mib[6], flags = 0, len; 559185377Ssam char *buf, *lim, *next; 560185377Ssam struct rt_addrinfo info; 561185377Ssam 562185377Ssam if (multicast_mode != NO_MULTICAST) { 563185377Ssam multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP); 564185377Ssam multicast_addr.sin_port = sp->s_port; 565185377Ssam } 566185377Ssam 567185377Ssam if (multicast_mode == SCOPED_MULTICAST) { 568185377Ssam struct ip_mreq mreq; 569185377Ssam unsigned char ttl; 570185377Ssam 571185377Ssam mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 572185377Ssam mreq.imr_interface.s_addr = htonl(INADDR_ANY); 573185377Ssam if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP, 574185377Ssam &mreq, sizeof(mreq)) < 0) { 575185377Ssam syslog(LOG_ERR, 576185377Ssam "setsockopt IP_ADD_MEMBERSHIP: %m"); 577185377Ssam return(0); 578185377Ssam } 579185377Ssam ttl = multicast_scope; 580185377Ssam if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, 581185377Ssam &ttl, sizeof(ttl)) < 0) { 582185377Ssam syslog(LOG_ERR, 583185377Ssam "setsockopt IP_MULTICAST_TTL: %m"); 584185377Ssam return(0); 585185377Ssam } 586185377Ssam return(1); 587185377Ssam } 588185377Ssam 589185377Ssam mib[0] = CTL_NET; 590185377Ssam mib[1] = PF_ROUTE; 591185377Ssam mib[2] = 0; 592185377Ssam mib[3] = AF_INET; 593187831Ssam mib[4] = NET_RT_IFLIST; 594185377Ssam mib[5] = 0; 595185377Ssam if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) 596185377Ssam quit("route-sysctl-estimate"); 597185377Ssam if ((buf = malloc(needed)) == NULL) 598185377Ssam quit("malloc"); 599185377Ssam if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) 600185377Ssam quit("actual retrieval of interface table"); 601185377Ssam lim = buf + needed; 602187831Ssam 603185377Ssam sdl = NULL; /* XXX just to keep gcc -Wall happy */ 604185377Ssam for (next = buf; next < lim; next += ifm->ifm_msglen) { 605187831Ssam ifm = (struct if_msghdr *)next; 606185377Ssam if (ifm->ifm_type == RTM_IFINFO) { 607185377Ssam sdl = (struct sockaddr_dl *)(ifm + 1); 608185377Ssam flags = ifm->ifm_flags; 609185377Ssam continue; 610185377Ssam } 611185377Ssam if ((flags & IFF_UP) == 0 || 612185377Ssam (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ? 613185377Ssam IFF_MULTICAST : 0) | 614185377Ssam IFF_BROADCAST|iff_flag)) == 0) 615185377Ssam continue; 616185377Ssam if (ifm->ifm_type != RTM_NEWADDR) 617185377Ssam quit("out of sync parsing NET_RT_IFLIST"); 618185377Ssam ifam = (struct ifa_msghdr *)ifm; 619185377Ssam info.rti_addrs = ifam->ifam_addrs; 620185377Ssam rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam, 621185377Ssam &info); 622185377Ssam /* gag, wish we could get rid of Internet dependencies */ 623185377Ssam#define dstaddr info.rti_info[RTAX_BRD] 624185377Ssam#define ifaddr info.rti_info[RTAX_IFA] 625185377Ssam#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr 626185377Ssam#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port 627185377Ssam if (dstaddr == 0 || dstaddr->sa_family != AF_INET) 628185377Ssam continue; 629185377Ssam PORT_SA(dstaddr) = sp->s_port; 630185377Ssam for (np = neighbors; np != NULL; np = np->n_next) 631185377Ssam if (memcmp(sdl->sdl_data, np->n_name, 632185377Ssam sdl->sdl_nlen) == 0 && 633185377Ssam IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) 634185377Ssam break; 635185377Ssam if (np != NULL) 636185377Ssam continue; 637185377Ssam len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1; 638185377Ssam np = (struct neighbor *)malloc(len); 639185377Ssam if (np == NULL) 640185377Ssam quit("malloc of neighbor structure"); 641185377Ssam memset(np, 0, len); 642185377Ssam np->n_flags = flags; 643185377Ssam np->n_addr = (struct sockaddr *)(np + 1); 644185377Ssam np->n_addrlen = dstaddr->sa_len; 645185377Ssam np->n_name = np->n_addrlen + (char *)np->n_addr; 646185377Ssam memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); 647185377Ssam memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); 648185377Ssam if (multicast_mode == PER_INTERFACE_MULTICAST && 649185377Ssam (flags & IFF_MULTICAST) && 650185377Ssam !(flags & IFF_LOOPBACK)) { 651185377Ssam struct ip_mreq mreq; 652185377Ssam 653185377Ssam memcpy((char *)np->n_addr, (char *)ifaddr, 654185377Ssam np->n_addrlen); 655185377Ssam mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP); 656185377Ssam mreq.imr_interface.s_addr = 657185377Ssam ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr; 658185377Ssam if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, 659185377Ssam &mreq, sizeof(mreq)) < 0) { 660185377Ssam syslog(LOG_ERR, 661185377Ssam "setsockopt IP_ADD_MEMBERSHIP: %m"); 662185377Ssam#if 0 663185377Ssam /* Fall back to broadcast on this if. */ 664185377Ssam np->n_flags &= ~IFF_MULTICAST; 665185377Ssam#else 666185377Ssam free((char *)np); 667185377Ssam continue; 668185377Ssam#endif 669185377Ssam } 670185380Ssam } 671185380Ssam np->n_next = neighbors; 672185377Ssam neighbors = np; 673185377Ssam } 674185377Ssam free(buf); 675185377Ssam return (1); 676185377Ssam} 677185377Ssam 678185377Ssam#ifdef DEBUG 679185377Ssamvoid 680185377SsamSendto(s, buf, cc, flags, to, tolen) 681185377Ssam int s; 682185377Ssam const void *buf; 683185377Ssam size_t cc; 684185377Ssam int flags; 685185377Ssam const struct sockaddr *to; 686185377Ssam int tolen; 687185377Ssam{ 688185377Ssam register struct whod *w = (struct whod *)buf; 689185377Ssam register struct whoent *we; 690185377Ssam struct sockaddr_in *sin = (struct sockaddr_in *)to; 691185377Ssam 692185377Ssam printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr), 693185377Ssam ntohs(sin->sin_port)); 694185377Ssam printf("hostname %s %s\n", w->wd_hostname, 695185377Ssam interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up")); 696185377Ssam printf("load %4.2f, %4.2f, %4.2f\n", 697185377Ssam ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0, 698185377Ssam ntohl(w->wd_loadav[2]) / 100.0); 699185377Ssam cc -= WHDRSIZE; 700185377Ssam for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) { 701185377Ssam time_t t = _time32_to_time(ntohl(we->we_utmp.out_time)); 702185377Ssam printf("%-8.8s %s:%s %.12s", 703185377Ssam we->we_utmp.out_name, 704185377Ssam w->wd_hostname, we->we_utmp.out_line, 705185377Ssam ctime(&t)+4); 706185377Ssam we->we_idle = ntohl(we->we_idle) / 60; 707185377Ssam if (we->we_idle) { 708185380Ssam if (we->we_idle >= 100*60) 709185380Ssam we->we_idle = 100*60 - 1; 710185380Ssam if (we->we_idle >= 60) 711185377Ssam printf(" %2d", we->we_idle / 60); 712185377Ssam else 713185377Ssam printf(" "); 714185377Ssam printf(":%02d", we->we_idle % 60); 715185377Ssam } 716185377Ssam printf("\n"); 717185377Ssam } 718185377Ssam} 719185377Ssam 720185377Ssamchar * 721185377Ssaminterval(time, updown) 722185377Ssam int time; 723185377Ssam char *updown; 724185377Ssam{ 725185377Ssam static char resbuf[32]; 726185380Ssam int days, hours, minutes; 727185380Ssam 728185377Ssam if (time < 0 || time > 3*30*24*60*60) { 729185377Ssam (void) sprintf(resbuf, " %s ??:??", updown); 730185377Ssam return (resbuf); 731185377Ssam } 732185377Ssam minutes = (time + 59) / 60; /* round to minutes */ 733185377Ssam hours = minutes / 60; minutes %= 60; 734185377Ssam days = hours / 24; hours %= 24; 735185377Ssam if (days) 736185377Ssam (void) sprintf(resbuf, "%s %2d+%02d:%02d", 737185380Ssam updown, days, hours, minutes); 738185380Ssam else 739185377Ssam (void) sprintf(resbuf, "%s %2d:%02d", 740185377Ssam updown, hours, minutes); 741185377Ssam return (resbuf); 742185377Ssam} 743185377Ssam#endif 744185377Ssam