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