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 * 4. 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
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1983, 1993\n\
33 The Regents of the University of California. All rights reserved.\n";
34#endif /* not lint */
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
| 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 * 4. 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
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1983, 1993\n\
33 The Regents of the University of California. All rights reserved.\n";
34#endif /* not lint */
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
|
43__FBSDID("$FreeBSD: head/usr.sbin/rwhod/rwhod.c 146940 2005-06-03 17:38:33Z ssouhlal $");
| 43__FBSDID("$FreeBSD: head/usr.sbin/rwhod/rwhod.c 201060 2009-12-27 21:14:55Z ed $");
|
44
45#include <sys/param.h>
46#include <sys/socket.h>
47#include <sys/stat.h>
48#include <sys/signal.h>
49#include <sys/ioctl.h>
50#include <sys/sysctl.h>
51
52#include <net/if.h>
53#include <net/if_dl.h>
54#include <net/route.h>
55#include <netinet/in.h>
56#include <arpa/inet.h>
57#include <protocols/rwhod.h>
58
59#include <ctype.h>
60#include <err.h>
61#include <errno.h>
62#include <fcntl.h>
63#include <netdb.h>
64#include <paths.h>
65#include <stdio.h>
66#include <stdlib.h>
67#include <string.h>
68#include <syslog.h>
69#include <timeconv.h>
| 44
45#include <sys/param.h>
46#include <sys/socket.h>
47#include <sys/stat.h>
48#include <sys/signal.h>
49#include <sys/ioctl.h>
50#include <sys/sysctl.h>
51
52#include <net/if.h>
53#include <net/if_dl.h>
54#include <net/route.h>
55#include <netinet/in.h>
56#include <arpa/inet.h>
57#include <protocols/rwhod.h>
58
59#include <ctype.h>
60#include <err.h>
61#include <errno.h>
62#include <fcntl.h>
63#include <netdb.h>
64#include <paths.h>
65#include <stdio.h>
66#include <stdlib.h>
67#include <string.h>
68#include <syslog.h>
69#include <timeconv.h>
|
| 70#define _ULOG_POSIX_NAMES
71#include <ulog.h>
|
70#include <unistd.h>
| 72#include <unistd.h>
|
71#include <utmp.h>
| |
72#include <pwd.h>
73#include <grp.h>
74
75/*
76 * This version of Berkeley's rwhod has been modified to use IP multicast
77 * datagrams, under control of a new command-line option:
78 *
79 * rwhod -m causes rwhod to use IP multicast (instead of
80 * broadcast or unicast) on all interfaces that have
81 * the IFF_MULTICAST flag set in their "ifnet" structs
82 * (excluding the loopback interface). The multicast
83 * reports are sent with a time-to-live of 1, to prevent
84 * forwarding beyond the directly-connected subnet(s).
85 *
86 * rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a
87 * time-to-live of <ttl>, via a SINGLE interface rather
88 * than all interfaces. <ttl> must be between 0 and
89 * MAX_MULTICAST_SCOPE, defined below. Note that "-m 1"
90 * is different than "-m", in that "-m 1" specifies
91 * transmission on one interface only.
92 *
93 * When "-m" is used without a <ttl> argument, the program accepts multicast
94 * rwhod reports from all multicast-capable interfaces. If a <ttl> argument
95 * is given, it accepts multicast reports from only one interface, the one
96 * on which reports are sent (which may be controlled via the host's routing
97 * table). Regardless of the "-m" option, the program accepts broadcast or
98 * unicast reports from all interfaces. Thus, this program will hear the
99 * reports of old, non-multicasting rwhods, but, if multicasting is used,
100 * those old rwhods won't hear the reports generated by this program.
101 *
102 * -- Steve Deering, Stanford University, February 1989
103 */
104
105#define UNPRIV_USER "daemon"
106#define UNPRIV_GROUP "daemon"
107
108#define NO_MULTICAST 0 /* multicast modes */
109#define PER_INTERFACE_MULTICAST 1
110#define SCOPED_MULTICAST 2
111
112#define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */
113
114#define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */
115 /* (belongs in protocols/rwhod.h) */
116
117int insecure_mode;
118int quiet_mode;
119int iff_flag = IFF_POINTOPOINT;
120int multicast_mode = NO_MULTICAST;
121int multicast_scope;
122struct sockaddr_in multicast_addr =
123 { sizeof multicast_addr, AF_INET, 0, { 0 }, { 0 } };
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;
| 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 =
124 { sizeof multicast_addr, AF_INET, 0, { 0 }, { 0 } };
125
126/*
127 * Alarm interval. Don't forget to change the down time check in ruptime
128 * if this is changed.
129 */
130#define AL_INTERVAL (3 * 60)
131
132char myname[MAXHOSTNAMELEN];
133
134/*
135 * We communicate with each neighbor in a list constructed at the time we're
136 * started up. Neighbors are currently directly connected via a hardware
137 * interface.
138 */
139struct neighbor {
140 struct neighbor *n_next;
141 char *n_name; /* interface name */
142 struct sockaddr *n_addr; /* who to send to */
143 int n_addrlen; /* size of address */
144 int n_flags; /* should forward?, interface flags */
145};
146
147struct neighbor *neighbors;
148struct whod mywd;
149struct servent *sp;
|
149int s, utmpf;
| 150int s;
|
150
151#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we))
152
153void run_as(uid_t *, gid_t *);
154int configure(int);
155void getboottime(int);
156void onalrm(int);
157void quit(const char *);
158void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *);
159int verify(char *, int);
160static void usage(void);
161#ifdef DEBUG
162char *interval(int, char *);
163void Sendto(int, const void *, size_t, int, const struct sockaddr *, int);
164#define sendto Sendto
165#endif
166
167int
168main(int argc, char *argv[])
169{
170 struct sockaddr_in from;
171 struct stat st;
172 char path[64];
173 int on = 1;
174 char *cp;
175 struct sockaddr_in soin;
176 uid_t unpriv_uid;
177 gid_t unpriv_gid;
178
179 if (getuid())
180 errx(1, "not super user");
181
182 run_as(&unpriv_uid, &unpriv_gid);
183
184 argv++; argc--;
185 while (argc > 0 && *argv[0] == '-') {
186 if (strcmp(*argv, "-m") == 0) {
187 if (argc > 1 && isdigit(*(argv + 1)[0])) {
188 argv++, argc--;
189 multicast_mode = SCOPED_MULTICAST;
190 multicast_scope = atoi(*argv);
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 }
197 else if (strcmp(*argv, "-i") == 0)
198 insecure_mode = 1;
199 else if (strcmp(*argv, "-l") == 0)
200 quiet_mode = 1;
201 else if (strcmp(*argv, "-p") == 0)
202 iff_flag = 0;
203 else
204 usage();
205 argv++, argc--;
206 }
207 if (argc > 0)
208 usage();
209#ifndef DEBUG
210 daemon(1, 0);
211#endif
212 (void) signal(SIGHUP, getboottime);
213 openlog("rwhod", LOG_PID, LOG_DAEMON);
214 sp = getservbyname("who", "udp");
215 if (sp == NULL) {
216 syslog(LOG_ERR, "who/udp: unknown service");
217 exit(1);
218 }
219 if (chdir(_PATH_RWHODIR) < 0) {
220 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR);
221 exit(1);
222 }
223 /*
224 * Establish host name as returned by system.
225 */
226 if (gethostname(myname, sizeof(myname) - 1) < 0) {
227 syslog(LOG_ERR, "gethostname: %m");
228 exit(1);
229 }
230 if ((cp = index(myname, '.')) != NULL)
231 *cp = '\0';
232 strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1);
233 mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0';
| 151
152#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we))
153
154void run_as(uid_t *, gid_t *);
155int configure(int);
156void getboottime(int);
157void onalrm(int);
158void quit(const char *);
159void rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *);
160int verify(char *, int);
161static void usage(void);
162#ifdef DEBUG
163char *interval(int, char *);
164void Sendto(int, const void *, size_t, int, const struct sockaddr *, int);
165#define sendto Sendto
166#endif
167
168int
169main(int argc, char *argv[])
170{
171 struct sockaddr_in from;
172 struct stat st;
173 char path[64];
174 int on = 1;
175 char *cp;
176 struct sockaddr_in soin;
177 uid_t unpriv_uid;
178 gid_t unpriv_gid;
179
180 if (getuid())
181 errx(1, "not super user");
182
183 run_as(&unpriv_uid, &unpriv_gid);
184
185 argv++; argc--;
186 while (argc > 0 && *argv[0] == '-') {
187 if (strcmp(*argv, "-m") == 0) {
188 if (argc > 1 && isdigit(*(argv + 1)[0])) {
189 argv++, argc--;
190 multicast_mode = SCOPED_MULTICAST;
191 multicast_scope = atoi(*argv);
192 if (multicast_scope > MAX_MULTICAST_SCOPE)
193 errx(1, "ttl must not exceed %u",
194 MAX_MULTICAST_SCOPE);
195 }
196 else multicast_mode = PER_INTERFACE_MULTICAST;
197 }
198 else if (strcmp(*argv, "-i") == 0)
199 insecure_mode = 1;
200 else if (strcmp(*argv, "-l") == 0)
201 quiet_mode = 1;
202 else if (strcmp(*argv, "-p") == 0)
203 iff_flag = 0;
204 else
205 usage();
206 argv++, argc--;
207 }
208 if (argc > 0)
209 usage();
210#ifndef DEBUG
211 daemon(1, 0);
212#endif
213 (void) signal(SIGHUP, getboottime);
214 openlog("rwhod", LOG_PID, LOG_DAEMON);
215 sp = getservbyname("who", "udp");
216 if (sp == NULL) {
217 syslog(LOG_ERR, "who/udp: unknown service");
218 exit(1);
219 }
220 if (chdir(_PATH_RWHODIR) < 0) {
221 syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR);
222 exit(1);
223 }
224 /*
225 * Establish host name as returned by system.
226 */
227 if (gethostname(myname, sizeof(myname) - 1) < 0) {
228 syslog(LOG_ERR, "gethostname: %m");
229 exit(1);
230 }
231 if ((cp = index(myname, '.')) != NULL)
232 *cp = '\0';
233 strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1);
234 mywd.wd_hostname[sizeof(mywd.wd_hostname) - 1] = '\0';
|
234 utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644);
235 if (utmpf < 0) {
236 syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
237 exit(1);
238 }
| |
239 getboottime(0);
240 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
241 syslog(LOG_ERR, "socket: %m");
242 exit(1);
243 }
244 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) {
245 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
246 exit(1);
247 }
248 memset(&soin, 0, sizeof(soin));
249 soin.sin_len = sizeof(soin);
250 soin.sin_family = AF_INET;
251 soin.sin_port = sp->s_port;
252 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) {
253 syslog(LOG_ERR, "bind: %m");
254 exit(1);
255 }
256 setgid(unpriv_gid);
257 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */
258 setuid(unpriv_uid);
259 if (!configure(s))
260 exit(1);
261 if (!quiet_mode) {
262 signal(SIGALRM, onalrm);
263 onalrm(0);
264 }
265 for (;;) {
266 struct whod wd;
267 socklen_t len = sizeof(from);
268 int cc, whod;
269 time_t t;
270
271 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0,
272 (struct sockaddr *)&from, &len);
273 if (cc <= 0) {
274 if (cc < 0 && errno != EINTR)
275 syslog(LOG_WARNING, "recv: %m");
276 continue;
277 }
278 if (from.sin_port != sp->s_port && !insecure_mode) {
279 syslog(LOG_WARNING, "%d: bad source port from %s",
280 ntohs(from.sin_port), inet_ntoa(from.sin_addr));
281 continue;
282 }
283 if (cc < WHDRSIZE) {
284 syslog(LOG_WARNING, "short packet from %s",
285 inet_ntoa(from.sin_addr));
286 continue;
287 }
288 if (wd.wd_vers != WHODVERSION)
289 continue;
290 if (wd.wd_type != WHODTYPE_STATUS)
291 continue;
292 if (!verify(wd.wd_hostname, sizeof wd.wd_hostname)) {
293 syslog(LOG_WARNING, "malformed host name from %s",
294 inet_ntoa(from.sin_addr));
295 continue;
296 }
297 (void) snprintf(path, sizeof path, "whod.%s", wd.wd_hostname);
298 /*
299 * Rather than truncating and growing the file each time,
300 * use ftruncate if size is less than previous size.
301 */
302 whod = open(path, O_WRONLY | O_CREAT, 0644);
303 if (whod < 0) {
304 syslog(LOG_WARNING, "%s: %m", path);
305 continue;
306 }
307#if ENDIAN != BIG_ENDIAN
308 {
309 int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
310 struct whoent *we;
311
312 /* undo header byte swapping before writing to file */
313 wd.wd_sendtime = ntohl(wd.wd_sendtime);
314 for (i = 0; i < 3; i++)
315 wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
316 wd.wd_boottime = ntohl(wd.wd_boottime);
317 we = wd.wd_we;
318 for (i = 0; i < n; i++) {
319 we->we_idle = ntohl(we->we_idle);
320 we->we_utmp.out_time =
321 ntohl(we->we_utmp.out_time);
322 we++;
323 }
324 }
325#endif
326 (void) time(&t);
327 wd.wd_recvtime = _time_to_int(t);
328 (void) write(whod, (char *)&wd, cc);
329 if (fstat(whod, &st) < 0 || st.st_size > cc)
330 ftruncate(whod, cc);
331 (void) close(whod);
332 }
333}
334
335static void
336usage()
337{
338 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n");
339 exit(1);
340}
341
342void
343run_as(uid, gid)
344 uid_t *uid;
345 gid_t *gid;
346{
347 struct passwd *pw;
348 struct group *gr;
349
350 pw = getpwnam(UNPRIV_USER);
351 if (!pw) {
352 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER);
353 exit(1);
354 }
355 *uid = pw->pw_uid;
356
357 gr = getgrnam(UNPRIV_GROUP);
358 if (!gr) {
359 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP);
360 exit(1);
361 }
362 *gid = gr->gr_gid;
363}
364
365/*
366 * Check out host name for unprintables
367 * and other funnies before allowing a file
368 * to be created. Sorry, but blanks aren't allowed.
369 */
370int
371verify(name, maxlen)
372 register char *name;
373 register int maxlen;
374{
375 register int size = 0;
376
377 while (*name && size < maxlen - 1) {
378 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name)))
379 return (0);
380 name++, size++;
381 }
382 *name = '\0';
383 return (size > 0);
384}
385
| 235 getboottime(0);
236 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
237 syslog(LOG_ERR, "socket: %m");
238 exit(1);
239 }
240 if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) {
241 syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
242 exit(1);
243 }
244 memset(&soin, 0, sizeof(soin));
245 soin.sin_len = sizeof(soin);
246 soin.sin_family = AF_INET;
247 soin.sin_port = sp->s_port;
248 if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) {
249 syslog(LOG_ERR, "bind: %m");
250 exit(1);
251 }
252 setgid(unpriv_gid);
253 setgroups(1, &unpriv_gid); /* XXX BOGUS groups[0] = egid */
254 setuid(unpriv_uid);
255 if (!configure(s))
256 exit(1);
257 if (!quiet_mode) {
258 signal(SIGALRM, onalrm);
259 onalrm(0);
260 }
261 for (;;) {
262 struct whod wd;
263 socklen_t len = sizeof(from);
264 int cc, whod;
265 time_t t;
266
267 cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0,
268 (struct sockaddr *)&from, &len);
269 if (cc <= 0) {
270 if (cc < 0 && errno != EINTR)
271 syslog(LOG_WARNING, "recv: %m");
272 continue;
273 }
274 if (from.sin_port != sp->s_port && !insecure_mode) {
275 syslog(LOG_WARNING, "%d: bad source port from %s",
276 ntohs(from.sin_port), inet_ntoa(from.sin_addr));
277 continue;
278 }
279 if (cc < WHDRSIZE) {
280 syslog(LOG_WARNING, "short packet from %s",
281 inet_ntoa(from.sin_addr));
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 %s",
290 inet_ntoa(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(&t);
323 wd.wd_recvtime = _time_to_int(t);
324 (void) write(whod, (char *)&wd, cc);
325 if (fstat(whod, &st) < 0 || st.st_size > cc)
326 ftruncate(whod, cc);
327 (void) close(whod);
328 }
329}
330
331static void
332usage()
333{
334 fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n");
335 exit(1);
336}
337
338void
339run_as(uid, gid)
340 uid_t *uid;
341 gid_t *gid;
342{
343 struct passwd *pw;
344 struct group *gr;
345
346 pw = getpwnam(UNPRIV_USER);
347 if (!pw) {
348 syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER);
349 exit(1);
350 }
351 *uid = pw->pw_uid;
352
353 gr = getgrnam(UNPRIV_GROUP);
354 if (!gr) {
355 syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP);
356 exit(1);
357 }
358 *gid = gr->gr_gid;
359}
360
361/*
362 * Check out host name for unprintables
363 * and other funnies before allowing a file
364 * to be created. Sorry, but blanks aren't allowed.
365 */
366int
367verify(name, maxlen)
368 register char *name;
369 register int maxlen;
370{
371 register int size = 0;
372
373 while (*name && size < maxlen - 1) {
374 if (!isascii(*name) || !(isalnum(*name) || ispunct(*name)))
375 return (0);
376 name++, size++;
377 }
378 *name = '\0';
379 return (size > 0);
380}
381
|
386int utmptime;
387int utmpent;
388int utmpsize = 0;
389struct utmp *utmp;
390int alarmcount;
391
| |
392void
| 382void
|
393onalrm(signo)
394 int signo __unused;
| 383onalrm(int signo __unused)
|
395{
| 384{
|
396 register struct neighbor *np;
397 register struct whoent *we = mywd.wd_we, *wlast;
398 register int i;
| 385 struct neighbor *np;
386 struct whoent *we = mywd.wd_we, *wend;
|
399 struct stat stb;
| 387 struct stat stb;
|
| 388 struct utmpx *ut;
389 static int alarmcount = 0;
|
400 double avenrun[3];
401 time_t now;
| 390 double avenrun[3];
391 time_t now;
|
402 int cc;
| 392 int i, cc;
|
403
404 now = time(NULL);
405 if (alarmcount % 10 == 0)
406 getboottime(0);
407 alarmcount++;
| 393
394 now = time(NULL);
395 if (alarmcount % 10 == 0)
396 getboottime(0);
397 alarmcount++;
|
408 (void) fstat(utmpf, &stb);
409 if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) {
410 utmptime = stb.st_mtime;
411 if (stb.st_size > utmpsize) {
412 utmpsize = stb.st_size + 10 * sizeof(struct utmp);
413 utmp = (struct utmp *)reallocf(utmp, utmpsize);
414 if (utmp == NULL) {
415 syslog(LOG_WARNING, "malloc failed");
416 utmpsize = 0;
417 goto done;
418 }
419 }
420 (void) lseek(utmpf, (off_t)0, L_SET);
421 cc = read(utmpf, (char *)utmp, stb.st_size);
422 if (cc < 0) {
423 syslog(LOG_ERR, "read(%s): %m", _PATH_UTMP);
424 goto done;
425 }
426 wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1];
427 utmpent = cc / sizeof(struct utmp);
428 for (i = 0; i < utmpent; i++)
429 if (utmp[i].ut_name[0]) {
430 memcpy(we->we_utmp.out_line, utmp[i].ut_line,
431 sizeof(utmp[i].ut_line));
432 memcpy(we->we_utmp.out_name, utmp[i].ut_name,
433 sizeof(utmp[i].ut_name));
434 we->we_utmp.out_time = htonl(utmp[i].ut_time);
435 if (we >= wlast)
436 break;
437 we++;
438 }
439 utmpent = we - mywd.wd_we;
| 398 wend = &mywd.wd_we[1024 / sizeof(struct whoent)];
399 setutxent();
400 while ((ut = getutxent()) != NULL && we < wend) {
401 if (ut->ut_type != USER_PROCESS)
402 continue;
403 strncpy(we->we_utmp.out_line, ut->ut_line,
404 sizeof(we->we_utmp.out_line));
405 strncpy(we->we_utmp.out_name, ut->ut_user,
406 sizeof(we->we_utmp.out_name));
407 we->we_utmp.out_time =
408 htonl(_time_to_time32(ut->ut_tv.tv_sec));
409 we++;
|
440 }
| 410 }
|
| 411 endutxent();
|
441
| 412
|
442 /*
443 * The test on utmpent looks silly---after all, if no one is
444 * logged on, why worry about efficiency?---but is useful on
445 * (e.g.) compute servers.
446 */
447 if (utmpent && chdir(_PATH_DEV)) {
| 413 if (chdir(_PATH_DEV)) {
|
448 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
449 exit(1);
450 }
| 414 syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
415 exit(1);
416 }
|
451 we = mywd.wd_we;
452 for (i = 0; i < utmpent; i++) {
| 417 wend = we;
418 for (we = mywd.wd_we; we < wend; we++) {
|
453 if (stat(we->we_utmp.out_line, &stb) >= 0)
454 we->we_idle = htonl(now - stb.st_atime);
455 we++;
456 }
457 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
458 for (i = 0; i < 3; i++)
459 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
| 419 if (stat(we->we_utmp.out_line, &stb) >= 0)
420 we->we_idle = htonl(now - stb.st_atime);
421 we++;
422 }
423 (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
424 for (i = 0; i < 3; i++)
425 mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
|
460 cc = (char *)we - (char *)&mywd;
| 426 cc = (char *)wend - (char *)&mywd;
|
461 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL)));
462 mywd.wd_vers = WHODVERSION;
463 mywd.wd_type = WHODTYPE_STATUS;
464 if (multicast_mode == SCOPED_MULTICAST) {
465 (void) sendto(s, (char *)&mywd, cc, 0,
466 (struct sockaddr *)&multicast_addr,
467 sizeof(multicast_addr));
468 }
469 else for (np = neighbors; np != NULL; np = np->n_next) {
470 if (multicast_mode == PER_INTERFACE_MULTICAST &&
471 np->n_flags & IFF_MULTICAST) {
472 /*
473 * Select the outgoing interface for the multicast.
474 */
475 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF,
476 &(((struct sockaddr_in *)np->n_addr)->sin_addr),
477 sizeof(struct in_addr)) < 0) {
478 syslog(LOG_ERR,
479 "setsockopt IP_MULTICAST_IF: %m");
480 exit(1);
481 }
482 (void) sendto(s, (char *)&mywd, cc, 0,
483 (struct sockaddr *)&multicast_addr,
484 sizeof(multicast_addr));
485 } else (void) sendto(s, (char *)&mywd, cc, 0,
486 np->n_addr, np->n_addrlen);
487 }
| 427 mywd.wd_sendtime = htonl(_time_to_time32(time(NULL)));
428 mywd.wd_vers = WHODVERSION;
429 mywd.wd_type = WHODTYPE_STATUS;
430 if (multicast_mode == SCOPED_MULTICAST) {
431 (void) sendto(s, (char *)&mywd, cc, 0,
432 (struct sockaddr *)&multicast_addr,
433 sizeof(multicast_addr));
434 }
435 else for (np = neighbors; np != NULL; np = np->n_next) {
436 if (multicast_mode == PER_INTERFACE_MULTICAST &&
437 np->n_flags & IFF_MULTICAST) {
438 /*
439 * Select the outgoing interface for the multicast.
440 */
441 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF,
442 &(((struct sockaddr_in *)np->n_addr)->sin_addr),
443 sizeof(struct in_addr)) < 0) {
444 syslog(LOG_ERR,
445 "setsockopt IP_MULTICAST_IF: %m");
446 exit(1);
447 }
448 (void) sendto(s, (char *)&mywd, cc, 0,
449 (struct sockaddr *)&multicast_addr,
450 sizeof(multicast_addr));
451 } else (void) sendto(s, (char *)&mywd, cc, 0,
452 np->n_addr, np->n_addrlen);
453 }
|
488 if (utmpent && chdir(_PATH_RWHODIR)) {
| 454 if (chdir(_PATH_RWHODIR)) {
|
489 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
490 exit(1);
491 }
| 455 syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
456 exit(1);
457 }
|
492done:
| |
493 (void) alarm(AL_INTERVAL);
494}
495
496void
497getboottime(signo)
498 int signo __unused;
499{
500 int mib[2];
501 size_t size;
502 struct timeval tm;
503
504 mib[0] = CTL_KERN;
505 mib[1] = KERN_BOOTTIME;
506 size = sizeof(tm);
507 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) {
508 syslog(LOG_ERR, "cannot get boottime: %m");
509 exit(1);
510 }
511 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec));
512}
513
514void
515quit(msg)
516 const char *msg;
517{
518 syslog(LOG_ERR, "%s", msg);
519 exit(1);
520}
521
522void
523rt_xaddrs(cp, cplim, rtinfo)
524 register caddr_t cp, cplim;
525 register struct rt_addrinfo *rtinfo;
526{
527 register struct sockaddr *sa;
528 register int i;
529
530 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
531 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
532 if ((rtinfo->rti_addrs & (1 << i)) == 0)
533 continue;
534 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
535 cp += SA_SIZE(sa);
536 }
537}
538
539/*
540 * Figure out device configuration and select
541 * networks which deserve status information.
542 */
543int
544configure(so)
545 int so;
546{
547 register struct neighbor *np;
548 register struct if_msghdr *ifm;
549 register struct ifa_msghdr *ifam;
550 struct sockaddr_dl *sdl;
551 size_t needed;
552 int mib[6], flags = 0, len;
553 char *buf, *lim, *next;
554 struct rt_addrinfo info;
555
556 if (multicast_mode != NO_MULTICAST) {
557 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP);
558 multicast_addr.sin_port = sp->s_port;
559 }
560
561 if (multicast_mode == SCOPED_MULTICAST) {
562 struct ip_mreq mreq;
563 unsigned char ttl;
564
565 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP);
566 mreq.imr_interface.s_addr = htonl(INADDR_ANY);
567 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP,
568 &mreq, sizeof(mreq)) < 0) {
569 syslog(LOG_ERR,
570 "setsockopt IP_ADD_MEMBERSHIP: %m");
571 return(0);
572 }
573 ttl = multicast_scope;
574 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL,
575 &ttl, sizeof(ttl)) < 0) {
576 syslog(LOG_ERR,
577 "setsockopt IP_MULTICAST_TTL: %m");
578 return(0);
579 }
580 return(1);
581 }
582
583 mib[0] = CTL_NET;
584 mib[1] = PF_ROUTE;
585 mib[2] = 0;
586 mib[3] = AF_INET;
587 mib[4] = NET_RT_IFLIST;
588 mib[5] = 0;
589 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
590 quit("route-sysctl-estimate");
591 if ((buf = malloc(needed)) == NULL)
592 quit("malloc");
593 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
594 quit("actual retrieval of interface table");
595 lim = buf + needed;
596
597 sdl = NULL; /* XXX just to keep gcc -Wall happy */
598 for (next = buf; next < lim; next += ifm->ifm_msglen) {
599 ifm = (struct if_msghdr *)next;
600 if (ifm->ifm_type == RTM_IFINFO) {
601 sdl = (struct sockaddr_dl *)(ifm + 1);
602 flags = ifm->ifm_flags;
603 continue;
604 }
605 if ((flags & IFF_UP) == 0 ||
606 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ?
607 IFF_MULTICAST : 0) |
608 IFF_BROADCAST|iff_flag)) == 0)
609 continue;
610 if (ifm->ifm_type != RTM_NEWADDR)
611 quit("out of sync parsing NET_RT_IFLIST");
612 ifam = (struct ifa_msghdr *)ifm;
613 info.rti_addrs = ifam->ifam_addrs;
614 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam,
615 &info);
616 /* gag, wish we could get rid of Internet dependencies */
617#define dstaddr info.rti_info[RTAX_BRD]
618#define ifaddr info.rti_info[RTAX_IFA]
619#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr
620#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port
621 if (dstaddr == 0 || dstaddr->sa_family != AF_INET)
622 continue;
623 PORT_SA(dstaddr) = sp->s_port;
624 for (np = neighbors; np != NULL; np = np->n_next)
625 if (memcmp(sdl->sdl_data, np->n_name,
626 sdl->sdl_nlen) == 0 &&
627 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr))
628 break;
629 if (np != NULL)
630 continue;
631 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1;
632 np = (struct neighbor *)malloc(len);
633 if (np == NULL)
634 quit("malloc of neighbor structure");
635 memset(np, 0, len);
636 np->n_flags = flags;
637 np->n_addr = (struct sockaddr *)(np + 1);
638 np->n_addrlen = dstaddr->sa_len;
639 np->n_name = np->n_addrlen + (char *)np->n_addr;
640 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen);
641 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen);
642 if (multicast_mode == PER_INTERFACE_MULTICAST &&
643 (flags & IFF_MULTICAST) &&
644 !(flags & IFF_LOOPBACK)) {
645 struct ip_mreq mreq;
646
647 memcpy((char *)np->n_addr, (char *)ifaddr,
648 np->n_addrlen);
649 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP);
650 mreq.imr_interface.s_addr =
651 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr;
652 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP,
653 &mreq, sizeof(mreq)) < 0) {
654 syslog(LOG_ERR,
655 "setsockopt IP_ADD_MEMBERSHIP: %m");
656#if 0
657 /* Fall back to broadcast on this if. */
658 np->n_flags &= ~IFF_MULTICAST;
659#else
660 free((char *)np);
661 continue;
662#endif
663 }
664 }
665 np->n_next = neighbors;
666 neighbors = np;
667 }
668 free(buf);
669 return (1);
670}
671
672#ifdef DEBUG
673void
674Sendto(s, buf, cc, flags, to, tolen)
675 int s;
676 const void *buf;
677 size_t cc;
678 int flags;
679 const struct sockaddr *to;
680 int tolen;
681{
682 register struct whod *w = (struct whod *)buf;
683 register struct whoent *we;
684 struct sockaddr_in *sin = (struct sockaddr_in *)to;
685
686 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr),
687 ntohs(sin->sin_port));
688 printf("hostname %s %s\n", w->wd_hostname,
689 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
690 printf("load %4.2f, %4.2f, %4.2f\n",
691 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
692 ntohl(w->wd_loadav[2]) / 100.0);
693 cc -= WHDRSIZE;
694 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) {
695 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time));
696 printf("%-8.8s %s:%s %.12s",
697 we->we_utmp.out_name,
698 w->wd_hostname, we->we_utmp.out_line,
699 ctime(&t)+4);
700 we->we_idle = ntohl(we->we_idle) / 60;
701 if (we->we_idle) {
702 if (we->we_idle >= 100*60)
703 we->we_idle = 100*60 - 1;
704 if (we->we_idle >= 60)
705 printf(" %2d", we->we_idle / 60);
706 else
707 printf(" ");
708 printf(":%02d", we->we_idle % 60);
709 }
710 printf("\n");
711 }
712}
713
714char *
715interval(time, updown)
716 int time;
717 char *updown;
718{
719 static char resbuf[32];
720 int days, hours, minutes;
721
722 if (time < 0 || time > 3*30*24*60*60) {
723 (void) sprintf(resbuf, " %s ??:??", updown);
724 return (resbuf);
725 }
726 minutes = (time + 59) / 60; /* round to minutes */
727 hours = minutes / 60; minutes %= 60;
728 days = hours / 24; hours %= 24;
729 if (days)
730 (void) sprintf(resbuf, "%s %2d+%02d:%02d",
731 updown, days, hours, minutes);
732 else
733 (void) sprintf(resbuf, "%s %2d:%02d",
734 updown, hours, minutes);
735 return (resbuf);
736}
737#endif
| 458 (void) alarm(AL_INTERVAL);
459}
460
461void
462getboottime(signo)
463 int signo __unused;
464{
465 int mib[2];
466 size_t size;
467 struct timeval tm;
468
469 mib[0] = CTL_KERN;
470 mib[1] = KERN_BOOTTIME;
471 size = sizeof(tm);
472 if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) {
473 syslog(LOG_ERR, "cannot get boottime: %m");
474 exit(1);
475 }
476 mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec));
477}
478
479void
480quit(msg)
481 const char *msg;
482{
483 syslog(LOG_ERR, "%s", msg);
484 exit(1);
485}
486
487void
488rt_xaddrs(cp, cplim, rtinfo)
489 register caddr_t cp, cplim;
490 register struct rt_addrinfo *rtinfo;
491{
492 register struct sockaddr *sa;
493 register int i;
494
495 memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
496 for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
497 if ((rtinfo->rti_addrs & (1 << i)) == 0)
498 continue;
499 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
500 cp += SA_SIZE(sa);
501 }
502}
503
504/*
505 * Figure out device configuration and select
506 * networks which deserve status information.
507 */
508int
509configure(so)
510 int so;
511{
512 register struct neighbor *np;
513 register struct if_msghdr *ifm;
514 register struct ifa_msghdr *ifam;
515 struct sockaddr_dl *sdl;
516 size_t needed;
517 int mib[6], flags = 0, len;
518 char *buf, *lim, *next;
519 struct rt_addrinfo info;
520
521 if (multicast_mode != NO_MULTICAST) {
522 multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP);
523 multicast_addr.sin_port = sp->s_port;
524 }
525
526 if (multicast_mode == SCOPED_MULTICAST) {
527 struct ip_mreq mreq;
528 unsigned char ttl;
529
530 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP);
531 mreq.imr_interface.s_addr = htonl(INADDR_ANY);
532 if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP,
533 &mreq, sizeof(mreq)) < 0) {
534 syslog(LOG_ERR,
535 "setsockopt IP_ADD_MEMBERSHIP: %m");
536 return(0);
537 }
538 ttl = multicast_scope;
539 if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL,
540 &ttl, sizeof(ttl)) < 0) {
541 syslog(LOG_ERR,
542 "setsockopt IP_MULTICAST_TTL: %m");
543 return(0);
544 }
545 return(1);
546 }
547
548 mib[0] = CTL_NET;
549 mib[1] = PF_ROUTE;
550 mib[2] = 0;
551 mib[3] = AF_INET;
552 mib[4] = NET_RT_IFLIST;
553 mib[5] = 0;
554 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
555 quit("route-sysctl-estimate");
556 if ((buf = malloc(needed)) == NULL)
557 quit("malloc");
558 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
559 quit("actual retrieval of interface table");
560 lim = buf + needed;
561
562 sdl = NULL; /* XXX just to keep gcc -Wall happy */
563 for (next = buf; next < lim; next += ifm->ifm_msglen) {
564 ifm = (struct if_msghdr *)next;
565 if (ifm->ifm_type == RTM_IFINFO) {
566 sdl = (struct sockaddr_dl *)(ifm + 1);
567 flags = ifm->ifm_flags;
568 continue;
569 }
570 if ((flags & IFF_UP) == 0 ||
571 (flags & (((multicast_mode == PER_INTERFACE_MULTICAST) ?
572 IFF_MULTICAST : 0) |
573 IFF_BROADCAST|iff_flag)) == 0)
574 continue;
575 if (ifm->ifm_type != RTM_NEWADDR)
576 quit("out of sync parsing NET_RT_IFLIST");
577 ifam = (struct ifa_msghdr *)ifm;
578 info.rti_addrs = ifam->ifam_addrs;
579 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam,
580 &info);
581 /* gag, wish we could get rid of Internet dependencies */
582#define dstaddr info.rti_info[RTAX_BRD]
583#define ifaddr info.rti_info[RTAX_IFA]
584#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr
585#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port
586 if (dstaddr == 0 || dstaddr->sa_family != AF_INET)
587 continue;
588 PORT_SA(dstaddr) = sp->s_port;
589 for (np = neighbors; np != NULL; np = np->n_next)
590 if (memcmp(sdl->sdl_data, np->n_name,
591 sdl->sdl_nlen) == 0 &&
592 IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr))
593 break;
594 if (np != NULL)
595 continue;
596 len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1;
597 np = (struct neighbor *)malloc(len);
598 if (np == NULL)
599 quit("malloc of neighbor structure");
600 memset(np, 0, len);
601 np->n_flags = flags;
602 np->n_addr = (struct sockaddr *)(np + 1);
603 np->n_addrlen = dstaddr->sa_len;
604 np->n_name = np->n_addrlen + (char *)np->n_addr;
605 memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen);
606 memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen);
607 if (multicast_mode == PER_INTERFACE_MULTICAST &&
608 (flags & IFF_MULTICAST) &&
609 !(flags & IFF_LOOPBACK)) {
610 struct ip_mreq mreq;
611
612 memcpy((char *)np->n_addr, (char *)ifaddr,
613 np->n_addrlen);
614 mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP);
615 mreq.imr_interface.s_addr =
616 ((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr;
617 if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP,
618 &mreq, sizeof(mreq)) < 0) {
619 syslog(LOG_ERR,
620 "setsockopt IP_ADD_MEMBERSHIP: %m");
621#if 0
622 /* Fall back to broadcast on this if. */
623 np->n_flags &= ~IFF_MULTICAST;
624#else
625 free((char *)np);
626 continue;
627#endif
628 }
629 }
630 np->n_next = neighbors;
631 neighbors = np;
632 }
633 free(buf);
634 return (1);
635}
636
637#ifdef DEBUG
638void
639Sendto(s, buf, cc, flags, to, tolen)
640 int s;
641 const void *buf;
642 size_t cc;
643 int flags;
644 const struct sockaddr *to;
645 int tolen;
646{
647 register struct whod *w = (struct whod *)buf;
648 register struct whoent *we;
649 struct sockaddr_in *sin = (struct sockaddr_in *)to;
650
651 printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr),
652 ntohs(sin->sin_port));
653 printf("hostname %s %s\n", w->wd_hostname,
654 interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
655 printf("load %4.2f, %4.2f, %4.2f\n",
656 ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
657 ntohl(w->wd_loadav[2]) / 100.0);
658 cc -= WHDRSIZE;
659 for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) {
660 time_t t = _time32_to_time(ntohl(we->we_utmp.out_time));
661 printf("%-8.8s %s:%s %.12s",
662 we->we_utmp.out_name,
663 w->wd_hostname, we->we_utmp.out_line,
664 ctime(&t)+4);
665 we->we_idle = ntohl(we->we_idle) / 60;
666 if (we->we_idle) {
667 if (we->we_idle >= 100*60)
668 we->we_idle = 100*60 - 1;
669 if (we->we_idle >= 60)
670 printf(" %2d", we->we_idle / 60);
671 else
672 printf(" ");
673 printf(":%02d", we->we_idle % 60);
674 }
675 printf("\n");
676 }
677}
678
679char *
680interval(time, updown)
681 int time;
682 char *updown;
683{
684 static char resbuf[32];
685 int days, hours, minutes;
686
687 if (time < 0 || time > 3*30*24*60*60) {
688 (void) sprintf(resbuf, " %s ??:??", updown);
689 return (resbuf);
690 }
691 minutes = (time + 59) / 60; /* round to minutes */
692 hours = minutes / 60; minutes %= 60;
693 days = hours / 24; hours %= 24;
694 if (days)
695 (void) sprintf(resbuf, "%s %2d+%02d:%02d",
696 updown, days, hours, minutes);
697 else
698 (void) sprintf(resbuf, "%s %2d:%02d",
699 updown, hours, minutes);
700 return (resbuf);
701}
702#endif
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