[unix-history] / usr / src / usr.sbin / rwhod / rwhod.c

/*
 * Copyright (c) 1983 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)rwhod.c	5.13 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/signal.h>
#include <sys/ioctl.h>
#include <sys/file.h>

#include <net/if.h>
#include <netinet/in.h>

#include <nlist.h>
#include <errno.h>
#include <utmp.h>
#include <ctype.h>
#include <netdb.h>
#include <syslog.h>
#include <protocols/rwhod.h>
#include <stdio.h>
#include <paths.h>

/*
 * Alarm interval. Don't forget to change the down time check in ruptime
 * if this is changed.
 */
#define AL_INTERVAL (3 * 60)

struct	sockaddr_in sin = { AF_INET };

char	myname[32];

struct	nlist nl[] = {
#define	NL_AVENRUN	0
	{ "_avenrun" },
#define	NL_BOOTTIME	1
	{ "_boottime" },
	0
};

/*
 * We communicate with each neighbor in
 * a list constructed at the time we're
 * started up.  Neighbors are currently
 * directly connected via a hardware interface.
 */
struct	neighbor {
	struct	neighbor *n_next;
	char	*n_name;		/* interface name */
	char	*n_addr;		/* who to send to */
	int	n_addrlen;		/* size of address */
	int	n_flags;		/* should forward?, interface flags */
};

struct	neighbor *neighbors;
struct	whod mywd;
struct	servent *sp;
int	s, utmpf, kmemf = -1;

#define	WHDRSIZE	(sizeof (mywd) - sizeof (mywd.wd_we))

extern int errno;
int	onalrm();
char	*strcpy(), *malloc();
long	lseek();
int	getkmem();
struct	in_addr inet_makeaddr();

main()
{
	struct sockaddr_in from;
	struct stat st;
	char path[64];
	int on = 1;
	char *cp, *index(), *strerror();

	if (getuid()) {
		fprintf(stderr, "rwhod: not super user\n");
		exit(1);
	}
	sp = getservbyname("who", "udp");
	if (sp == 0) {
		fprintf(stderr, "rwhod: udp/who: unknown service\n");
		exit(1);
	}
#ifndef DEBUG
	if (fork())
		exit(0);
	{ int s;
	  for (s = 0; s < 10; s++)
		(void) close(s);
	  (void) open("/", 0);
	  (void) dup2(0, 1);
	  (void) dup2(0, 2);
	  s = open(_PATH_TTY, 2);
	  if (s >= 0) {
		ioctl(s, TIOCNOTTY, 0);
		(void) close(s);
	  }
	}
#endif
	if (chdir(_PATH_RWHODIR) < 0) {
		(void)fprintf(stderr, "rwhod: %s: %s\n",
		    _PATH_RWHODIR, strerror(errno));
		exit(1);
	}
	(void) signal(SIGHUP, getkmem);
	openlog("rwhod", LOG_PID, LOG_DAEMON);
	/*
	 * Establish host name as returned by system.
	 */
	if (gethostname(myname, sizeof (myname) - 1) < 0) {
		syslog(LOG_ERR, "gethostname: %m");
		exit(1);
	}
	if ((cp = index(myname, '.')) != NULL)
		*cp = '\0';
	strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
	utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644);
	if (utmpf < 0) {
		syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
		exit(1);
	}
	getkmem();
	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
		syslog(LOG_ERR, "socket: %m");
		exit(1);
	}
	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
		syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
		exit(1);
	}
	sin.sin_port = sp->s_port;
	if (bind(s, &sin, sizeof (sin)) < 0) {
		syslog(LOG_ERR, "bind: %m");
		exit(1);
	}
	if (!configure(s))
		exit(1);
	signal(SIGALRM, onalrm);
	onalrm();
	for (;;) {
		struct whod wd;
		int cc, whod, len = sizeof (from);

		cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
			&from, &len);
		if (cc <= 0) {
			if (cc < 0 && errno != EINTR)
				syslog(LOG_WARNING, "recv: %m");
			continue;
		}
		if (from.sin_port != sp->s_port) {
			syslog(LOG_WARNING, "%d: bad from port",
				ntohs(from.sin_port));
			continue;
		}
#ifdef notdef
		if (gethostbyname(wd.wd_hostname) == 0) {
			syslog(LOG_WARNING, "%s: unknown host",
				wd.wd_hostname);
			continue;
		}
#endif
		if (wd.wd_vers != WHODVERSION)
			continue;
		if (wd.wd_type != WHODTYPE_STATUS)
			continue;
		if (!verify(wd.wd_hostname)) {
			syslog(LOG_WARNING, "malformed host name from %x",
				from.sin_addr);
			continue;
		}
		(void) sprintf(path, "whod.%s", wd.wd_hostname);
		/*
		 * Rather than truncating and growing the file each time,
		 * use ftruncate if size is less than previous size.
		 */
		whod = open(path, O_WRONLY | O_CREAT, 0644);
		if (whod < 0) {
			syslog(LOG_WARNING, "%s: %m", path);
			continue;
		}
#if vax || pdp11
		{
			int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
			struct whoent *we;

			/* undo header byte swapping before writing to file */
			wd.wd_sendtime = ntohl(wd.wd_sendtime);
			for (i = 0; i < 3; i++)
				wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
			wd.wd_boottime = ntohl(wd.wd_boottime);
			we = wd.wd_we;
			for (i = 0; i < n; i++) {
				we->we_idle = ntohl(we->we_idle);
				we->we_utmp.out_time =
				    ntohl(we->we_utmp.out_time);
				we++;
			}
		}
#endif
		(void) time(&wd.wd_recvtime);
		(void) write(whod, (char *)&wd, cc);
		if (fstat(whod, &st) < 0 || st.st_size > cc)
			ftruncate(whod, cc);
		(void) close(whod);
	}
}

/*
 * Check out host name for unprintables
 * and other funnies before allowing a file
 * to be created.  Sorry, but blanks aren't allowed.
 */
verify(name)
	register char *name;
{
	register int size = 0;

	while (*name) {
		if (!isascii(*name) || !(isalnum(*name) || ispunct(*name)))
			return (0);
		name++, size++;
	}
	return (size > 0);
}

int	utmptime;
int	utmpent;
int	utmpsize = 0;
struct	utmp *utmp;
int	alarmcount;

onalrm()
{
	register struct neighbor *np;
	register struct whoent *we = mywd.wd_we, *wlast;
	register int i;
	struct stat stb;
	int cc;
	double avenrun[3];
	time_t now = time((time_t *)NULL);
	char *strerror();

	if (alarmcount % 10 == 0)
		getkmem();
	alarmcount++;
	(void) fstat(utmpf, &stb);
	if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) {
		utmptime = stb.st_mtime;
		if (stb.st_size > utmpsize) {
			utmpsize = stb.st_size + 10 * sizeof(struct utmp);
			if (utmp)
				utmp = (struct utmp *)realloc(utmp, utmpsize);
			else
				utmp = (struct utmp *)malloc(utmpsize);
			if (! utmp) {
				fprintf(stderr, "rwhod: malloc failed\n");
				utmpsize = 0;
				goto done;
			}
		}
		(void) lseek(utmpf, (long)0, L_SET);
		cc = read(utmpf, (char *)utmp, stb.st_size);
		if (cc < 0) {
			fprintf(stderr, "rwhod: %s: %s\n",
			    _PATH_UTMP, strerror(errno));
			goto done;
		}
		wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
		utmpent = cc / sizeof (struct utmp);
		for (i = 0; i < utmpent; i++)
			if (utmp[i].ut_name[0]) {
				bcopy(utmp[i].ut_line, we->we_utmp.out_line,
				   sizeof (utmp[i].ut_line));
				bcopy(utmp[i].ut_name, we->we_utmp.out_name,
				   sizeof (utmp[i].ut_name));
				we->we_utmp.out_time = htonl(utmp[i].ut_time);
				if (we >= wlast)
					break;
				we++;
			}
		utmpent = we - mywd.wd_we;
	}

	/*
	 * The test on utmpent looks silly---after all, if no one is
	 * logged on, why worry about efficiency?---but is useful on
	 * (e.g.) compute servers.
	 */
	if (utmpent && chdir(_PATH_DEV)) {
		syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
		exit(1);
	}
	we = mywd.wd_we;
	for (i = 0; i < utmpent; i++) {
		if (stat(we->we_utmp.out_line, &stb) >= 0)
			we->we_idle = htonl(now - stb.st_atime);
		we++;
	}
	(void) lseek(kmemf, (long)nl[NL_AVENRUN].n_value, L_SET);
	(void) read(kmemf, (char *)avenrun, sizeof (avenrun));
	for (i = 0; i < 3; i++)
		mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
	cc = (char *)we - (char *)&mywd;
	mywd.wd_sendtime = htonl(time(0));
	mywd.wd_vers = WHODVERSION;
	mywd.wd_type = WHODTYPE_STATUS;
	for (np = neighbors; np != NULL; np = np->n_next)
		(void) sendto(s, (char *)&mywd, cc, 0,
			np->n_addr, np->n_addrlen);
	if (utmpent && chdir(_PATH_RWHODIR)) {
		syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
		exit(1);
	}
done:
	(void) alarm(AL_INTERVAL);
}

getkmem()
{
	static ino_t vmunixino;
	static time_t vmunixctime;
	struct stat sb;

	if (stat(_PATH_UNIX, &sb) < 0) {
		if (vmunixctime)
			return;
	} else {
		if (sb.st_ctime == vmunixctime && sb.st_ino == vmunixino)
			return;
		vmunixctime = sb.st_ctime;
		vmunixino= sb.st_ino;
	}
	if (kmemf >= 0)
		(void) close(kmemf);
loop:
	if (nlist(_PATH_UNIX, nl)) {
		syslog(LOG_WARNING, "%s: namelist botch", _PATH_UNIX);
		sleep(300);
		goto loop;
	}
	kmemf = open(_PATH_KMEM, O_RDONLY, 0);
	if (kmemf < 0) {
		syslog(LOG_ERR, "%s: %m", _PATH_KMEM);
		exit(1);
	}
	(void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, L_SET);
	(void) read(kmemf, (char *)&mywd.wd_boottime,
	    sizeof (mywd.wd_boottime));
	mywd.wd_boottime = htonl(mywd.wd_boottime);
}

/*
 * Figure out device configuration and select
 * networks which deserve status information.
 */
configure(s)
	int s;
{
	char buf[BUFSIZ];
	struct ifconf ifc;
	struct ifreq ifreq, *ifr;
	struct sockaddr_in *sin;
	register struct neighbor *np;
	int n;

	ifc.ifc_len = sizeof (buf);
	ifc.ifc_buf = buf;
	if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
		syslog(LOG_ERR, "ioctl (get interface configuration)");
		return (0);
	}
	ifr = ifc.ifc_req;
	for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) {
		for (np = neighbors; np != NULL; np = np->n_next)
			if (np->n_name &&
			    strcmp(ifr->ifr_name, np->n_name) == 0)
				break;
		if (np != NULL)
			continue;
		ifreq = *ifr;
		np = (struct neighbor *)malloc(sizeof (*np));
		if (np == NULL)
			continue;
		np->n_name = malloc(strlen(ifr->ifr_name) + 1);
		if (np->n_name == NULL) {
			free((char *)np);
			continue;
		}
		strcpy(np->n_name, ifr->ifr_name);
		np->n_addrlen = sizeof (ifr->ifr_addr);
		np->n_addr = malloc(np->n_addrlen);
		if (np->n_addr == NULL) {
			free(np->n_name);
			free((char *)np);
			continue;
		}
		bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
		if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
			syslog(LOG_ERR, "ioctl (get interface flags)");
			free((char *)np);
			continue;
		}
		if ((ifreq.ifr_flags & IFF_UP) == 0 ||
		    (ifreq.ifr_flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0) {
			free((char *)np);
			continue;
		}
		np->n_flags = ifreq.ifr_flags;
		if (np->n_flags & IFF_POINTOPOINT) {
			if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
				syslog(LOG_ERR, "ioctl (get dstaddr)");
				free((char *)np);
				continue;
			}
			/* we assume addresses are all the same size */
			bcopy((char *)&ifreq.ifr_dstaddr,
			  np->n_addr, np->n_addrlen);
		}
		if (np->n_flags & IFF_BROADCAST) {
			if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
				syslog(LOG_ERR, "ioctl (get broadaddr)");
				free((char *)np);
				continue;
			}
			/* we assume addresses are all the same size */
			bcopy((char *)&ifreq.ifr_broadaddr,
			  np->n_addr, np->n_addrlen);
		}
		/* gag, wish we could get rid of Internet dependencies */
		sin = (struct sockaddr_in *)np->n_addr;
		sin->sin_port = sp->s_port;
		np->n_next = neighbors;
		neighbors = np;
	}
	return (1);
}

#ifdef DEBUG
sendto(s, buf, cc, flags, to, tolen)
	int s;
	char *buf;
	int cc, flags;
	char *to;
	int tolen;
{
	register struct whod *w = (struct whod *)buf;
	register struct whoent *we;
	struct sockaddr_in *sin = (struct sockaddr_in *)to;
	char *interval();

	printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port));
	printf("hostname %s %s\n", w->wd_hostname,
	   interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), "  up"));
	printf("load %4.2f, %4.2f, %4.2f\n",
	    ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
	    ntohl(w->wd_loadav[2]) / 100.0);
	cc -= WHDRSIZE;
	for (we = w->wd_we, cc /= sizeof (struct whoent); cc > 0; cc--, we++) {
		time_t t = ntohl(we->we_utmp.out_time);
		printf("%-8.8s %s:%s %.12s",
			we->we_utmp.out_name,
			w->wd_hostname, we->we_utmp.out_line,
			ctime(&t)+4);
		we->we_idle = ntohl(we->we_idle) / 60;
		if (we->we_idle) {
			if (we->we_idle >= 100*60)
				we->we_idle = 100*60 - 1;
			if (we->we_idle >= 60)
				printf(" %2d", we->we_idle / 60);
			else
				printf("   ");
			printf(":%02d", we->we_idle % 60);
		}
		printf("\n");
	}
}

char *
interval(time, updown)
	int time;
	char *updown;
{
	static char resbuf[32];
	int days, hours, minutes;

	if (time < 0 || time > 3*30*24*60*60) {
		(void) sprintf(resbuf, "   %s ??:??", updown);
		return (resbuf);
	}
	minutes = (time + 59) / 60;		/* round to minutes */
	hours = minutes / 60; minutes %= 60;
	days = hours / 24; hours %= 24;
	if (days)
		(void) sprintf(resbuf, "%s %2d+%02d:%02d",
		    updown, days, hours, minutes);
	else
		(void) sprintf(resbuf, "%s    %2d:%02d",
		    updown, hours, minutes);
	return (resbuf);
}
#endif
Commit	Line	Data
3b86b0f6	1	/*
86f08f99 KB	2	* Copyright (c) 1983 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
	10	* by the University of California, Berkeley. The name of the
	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
3b86b0f6 DF	16	*/
	17
	18	#ifndef lint
	19	char copyright[] =
86f08f99	20	"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
3b86b0f6	21	All rights reserved.\n";
86f08f99	22	#endif /* not lint */
3b86b0f6	23
52b4fb0c	24	#ifndef lint
7abf8d65	25	static char sccsid[] = "@(#)rwhod.c 5.13 (Berkeley) %G%";
86f08f99	26	#endif /* not lint */
52b4fb0c	27
52b4fb0c	28	#include <sys/types.h>
52b4fb0c	29	#include <sys/socket.h>
52b4fb0c	30	#include <sys/stat.h>
17ccb086	31	#include <sys/signal.h>
52b4fb0c	32	#include <sys/ioctl.h>
9bd66dcf	33	#include <sys/file.h>
de3b21e8	34
7af17b3e	35	#include <net/if.h>
de3b21e8 SL	36	#include <netinet/in.h>
	37
	38	#include <nlist.h>
de3b21e8 SL	39	#include <errno.h>
de3b21e8 SL	40	#include <utmp.h>
a0f59ac1 SL	41	#include <ctype.h>
a0f59ac1 SL	42	#include <netdb.h>
00cdc205	43	#include <syslog.h>
3c13756b	44	#include <protocols/rwhod.h>
17ccb086	45	#include <stdio.h>
7abf8d65	46	#include <paths.h>
de3b21e8	47
83361bb3 RC	48	/*
	49	* Alarm interval. Don't forget to change the down time check in ruptime
	50	* if this is changed.
	51	*/
00cdc205	52	#define AL_INTERVAL (3 * 60)
83361bb3	53
a0f59ac1	54	struct sockaddr_in sin = { AF_INET };
52b4fb0c	55
7af17b3e	56	char myname[32];
52b4fb0c BJ	57
	58	struct nlist nl[] = {
	59	#define NL_AVENRUN 0
	60	{ "_avenrun" },
de3b21e8 SL	61	#define NL_BOOTTIME 1
de3b21e8 SL	62	{ "_boottime" },
52b4fb0c BJ	63	0
	64	};
	65
7af17b3e SL	66	/*
	67	* We communicate with each neighbor in
	68	* a list constructed at the time we're
	69	* started up. Neighbors are currently
	70	* directly connected via a hardware interface.
	71	*/
	72	struct neighbor {
	73	struct neighbor *n_next;
	74	char n_name; / interface name */
	75	char n_addr; / who to send to */
	76	int n_addrlen; /* size of address */
	77	int n_flags; /* should forward?, interface flags */
	78	};
	79
	80	struct neighbor *neighbors;
52b4fb0c	81	struct whod mywd;
7af17b3e	82	struct servent *sp;
52b4fb0c BJ	83	int s, utmpf, kmemf = -1;
52b4fb0c BJ	84
7af17b3e	85	#define WHDRSIZE (sizeof (mywd) - sizeof (mywd.wd_we))
fea387f0	86
17ccb086	87	extern int errno;
52b4fb0c	88	int onalrm();
9bd38ba8	89	char strcpy(), malloc();
52b4fb0c BJ	90	long lseek();
52b4fb0c BJ	91	int getkmem();
7af17b3e	92	struct in_addr inet_makeaddr();
52b4fb0c BJ	93
	94	main()
	95	{
	96	struct sockaddr_in from;
0f2d5e68	97	struct stat st;
52b4fb0c	98	char path[64];
221be169	99	int on = 1;
17ccb086	100	char cp, index(), *strerror();
52b4fb0c	101
00cdc205 RC	102	if (getuid()) {
	103	fprintf(stderr, "rwhod: not super user\n");
	104	exit(1);
	105	}
a0f59ac1 SL	106	sp = getservbyname("who", "udp");
	107	if (sp == 0) {
	108	fprintf(stderr, "rwhod: udp/who: unknown service\n");
	109	exit(1);
	110	}
52b4fb0c BJ	111	#ifndef DEBUG
	112	if (fork())
	113	exit(0);
	114	{ int s;
	115	for (s = 0; s < 10; s++)
	116	(void) close(s);
	117	(void) open("/", 0);
	118	(void) dup2(0, 1);
	119	(void) dup2(0, 2);
7abf8d65	120	s = open(_PATH_TTY, 2);
52b4fb0c BJ	121	if (s >= 0) {
	122	ioctl(s, TIOCNOTTY, 0);
	123	(void) close(s);
	124	}
	125	}
	126	#endif
17ccb086 KB	127	if (chdir(_PATH_RWHODIR) < 0) {
	128	(void)fprintf(stderr, "rwhod: %s: %s\n",
	129	_PATH_RWHODIR, strerror(errno));
ac82a1ec KM	130	exit(1);
ac82a1ec KM	131	}
52b4fb0c	132	(void) signal(SIGHUP, getkmem);
076ae92c	133	openlog("rwhod", LOG_PID, LOG_DAEMON);
7af17b3e SL	134	/*
	135	* Establish host name as returned by system.
	136	*/
	137	if (gethostname(myname, sizeof (myname) - 1) < 0) {
00cdc205	138	syslog(LOG_ERR, "gethostname: %m");
52b4fb0c BJ	139	exit(1);
52b4fb0c BJ	140	}
d2444544 JB	141	if ((cp = index(myname, '.')) != NULL)
d2444544 JB	142	*cp = '\0';
7af17b3e	143	strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
17ccb086	144	utmpf = open(_PATH_UTMP, O_RDONLY\|O_CREAT, 0644);
52b4fb0c	145	if (utmpf < 0) {
17ccb086	146	syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
52b4fb0c BJ	147	exit(1);
	148	}
	149	getkmem();
9bd66dcf	150	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
00cdc205	151	syslog(LOG_ERR, "socket: %m");
de3b21e8 SL	152	exit(1);
de3b21e8 SL	153	}
3de1986a	154	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
b0e1e5f3 MK	155	syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
	156	exit(1);
	157	}
7af17b3e	158	sin.sin_port = sp->s_port;
9bd66dcf	159	if (bind(s, &sin, sizeof (sin)) < 0) {
00cdc205	160	syslog(LOG_ERR, "bind: %m");
de3b21e8	161	exit(1);
52b4fb0c	162	}
7af17b3e SL	163	if (!configure(s))
7af17b3e SL	164	exit(1);
8a53982e	165	signal(SIGALRM, onalrm);
52b4fb0c BJ	166	onalrm();
	167	for (;;) {
	168	struct whod wd;
7af17b3e	169	int cc, whod, len = sizeof (from);
52b4fb0c	170
7af17b3e SL	171	cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
7af17b3e SL	172	&from, &len);
52b4fb0c BJ	173	if (cc <= 0) {
52b4fb0c BJ	174	if (cc < 0 && errno != EINTR)
00cdc205	175	syslog(LOG_WARNING, "recv: %m");
52b4fb0c BJ	176	continue;
52b4fb0c BJ	177	}
a0f59ac1	178	if (from.sin_port != sp->s_port) {
00cdc205	179	syslog(LOG_WARNING, "%d: bad from port",
a0f59ac1	180	ntohs(from.sin_port));
52b4fb0c BJ	181	continue;
52b4fb0c BJ	182	}
a0f59ac1 SL	183	#ifdef notdef
a0f59ac1 SL	184	if (gethostbyname(wd.wd_hostname) == 0) {
00cdc205	185	syslog(LOG_WARNING, "%s: unknown host",
a0f59ac1 SL	186	wd.wd_hostname);
	187	continue;
	188	}
	189	#endif
aaddf8a1 SL	190	if (wd.wd_vers != WHODVERSION)
aaddf8a1 SL	191	continue;
7af17b3e SL	192	if (wd.wd_type != WHODTYPE_STATUS)
7af17b3e SL	193	continue;
a0f59ac1	194	if (!verify(wd.wd_hostname)) {
00cdc205	195	syslog(LOG_WARNING, "malformed host name from %x",
a0f59ac1	196	from.sin_addr);
52b4fb0c BJ	197	continue;
52b4fb0c BJ	198	}
ac82a1ec	199	(void) sprintf(path, "whod.%s", wd.wd_hostname);
0f2d5e68 MK	200	/*
	201	* Rather than truncating and growing the file each time,
	202	* use ftruncate if size is less than previous size.
	203	*/
	204	whod = open(path, O_WRONLY \| O_CREAT, 0644);
52b4fb0c	205	if (whod < 0) {
00cdc205	206	syslog(LOG_WARNING, "%s: %m", path);
52b4fb0c BJ	207	continue;
52b4fb0c BJ	208	}
fea387f0 SL	209	#if vax \|\| pdp11
fea387f0 SL	210	{
9bd66dcf	211	int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
fea387f0 SL	212	struct whoent *we;
	213
	214	/* undo header byte swapping before writing to file */
	215	wd.wd_sendtime = ntohl(wd.wd_sendtime);
	216	for (i = 0; i < 3; i++)
	217	wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
	218	wd.wd_boottime = ntohl(wd.wd_boottime);
	219	we = wd.wd_we;
	220	for (i = 0; i < n; i++) {
	221	we->we_idle = ntohl(we->we_idle);
1cccbcb3 SL	222	we->we_utmp.out_time =
1cccbcb3 SL	223	ntohl(we->we_utmp.out_time);
fea387f0 SL	224	we++;
	225	}
	226	}
	227	#endif
52b4fb0c BJ	228	(void) time(&wd.wd_recvtime);
52b4fb0c BJ	229	(void) write(whod, (char *)&wd, cc);
0f2d5e68 MK	230	if (fstat(whod, &st) < 0 \|\| st.st_size > cc)
0f2d5e68 MK	231	ftruncate(whod, cc);
52b4fb0c BJ	232	(void) close(whod);
	233	}
	234	}
	235
a0f59ac1 SL	236	/*
	237	* Check out host name for unprintables
	238	* and other funnies before allowing a file
	239	* to be created. Sorry, but blanks aren't allowed.
	240	*/
	241	verify(name)
	242	register char *name;
	243	{
	244	register int size = 0;
	245
	246	while (*name) {
77650176	247	if (!isascii(name) \|\| !(isalnum(name) \|\| ispunct(*name)))
a0f59ac1 SL	248	return (0);
	249	name++, size++;
	250	}
	251	return (size > 0);
	252	}
	253
52b4fb0c BJ	254	int utmptime;
52b4fb0c BJ	255	int utmpent;
4c9b3acd JB	256	int utmpsize = 0;
4c9b3acd JB	257	struct utmp *utmp;
52b4fb0c BJ	258	int alarmcount;
	259
	260	onalrm()
	261	{
17ccb086 KB	262	register struct neighbor *np;
17ccb086 KB	263	register struct whoent we = mywd.wd_we, wlast;
52b4fb0c BJ	264	register int i;
52b4fb0c BJ	265	struct stat stb;
52b4fb0c BJ	266	int cc;
52b4fb0c BJ	267	double avenrun[3];
17ccb086 KB	268	time_t now = time((time_t *)NULL);
17ccb086 KB	269	char *strerror();
52b4fb0c BJ	270
	271	if (alarmcount % 10 == 0)
	272	getkmem();
	273	alarmcount++;
	274	(void) fstat(utmpf, &stb);
4c9b3acd	275	if ((stb.st_mtime != utmptime) \|\| (stb.st_size > utmpsize)) {
02d31241	276	utmptime = stb.st_mtime;
4c9b3acd JB	277	if (stb.st_size > utmpsize) {
	278	utmpsize = stb.st_size + 10 * sizeof(struct utmp);
	279	if (utmp)
	280	utmp = (struct utmp *)realloc(utmp, utmpsize);
	281	else
	282	utmp = (struct utmp *)malloc(utmpsize);
	283	if (! utmp) {
	284	fprintf(stderr, "rwhod: malloc failed\n");
	285	utmpsize = 0;
	286	goto done;
	287	}
	288	}
9bd66dcf	289	(void) lseek(utmpf, (long)0, L_SET);
4c9b3acd	290	cc = read(utmpf, (char *)utmp, stb.st_size);
52b4fb0c	291	if (cc < 0) {
17ccb086 KB	292	fprintf(stderr, "rwhod: %s: %s\n",
17ccb086 KB	293	_PATH_UTMP, strerror(errno));
08d10f57	294	goto done;
52b4fb0c	295	}
7af17b3e	296	wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
52b4fb0c BJ	297	utmpent = cc / sizeof (struct utmp);
	298	for (i = 0; i < utmpent; i++)
	299	if (utmp[i].ut_name[0]) {
b1456c48 SL	300	bcopy(utmp[i].ut_line, we->we_utmp.out_line,
	301	sizeof (utmp[i].ut_line));
	302	bcopy(utmp[i].ut_name, we->we_utmp.out_name,
	303	sizeof (utmp[i].ut_name));
b1456c48	304	we->we_utmp.out_time = htonl(utmp[i].ut_time);
76886f32 SL	305	if (we >= wlast)
76886f32 SL	306	break;
52b4fb0c BJ	307	we++;
	308	}
	309	utmpent = we - mywd.wd_we;
	310	}
221be169 KM	311
	312	/*
	313	* The test on utmpent looks silly---after all, if no one is
	314	* logged on, why worry about efficiency?---but is useful on
	315	* (e.g.) compute servers.
	316	*/
7abf8d65 KB	317	if (utmpent && chdir(_PATH_DEV)) {
7abf8d65 KB	318	syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
221be169 KM	319	exit(1);
221be169 KM	320	}
52b4fb0c BJ	321	we = mywd.wd_we;
52b4fb0c BJ	322	for (i = 0; i < utmpent; i++) {
221be169	323	if (stat(we->we_utmp.out_line, &stb) >= 0)
b1456c48	324	we->we_idle = htonl(now - stb.st_atime);
52b4fb0c BJ	325	we++;
52b4fb0c BJ	326	}
9bd66dcf	327	(void) lseek(kmemf, (long)nl[NL_AVENRUN].n_value, L_SET);
52b4fb0c BJ	328	(void) read(kmemf, (char *)avenrun, sizeof (avenrun));
52b4fb0c BJ	329	for (i = 0; i < 3; i++)
353c1281	330	mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
b1456c48	331	cc = (char )we - (char )&mywd;
b1456c48	332	mywd.wd_sendtime = htonl(time(0));
7af17b3e SL	333	mywd.wd_vers = WHODVERSION;
	334	mywd.wd_type = WHODTYPE_STATUS;
	335	for (np = neighbors; np != NULL; np = np->n_next)
	336	(void) sendto(s, (char *)&mywd, cc, 0,
	337	np->n_addr, np->n_addrlen);
17ccb086 KB	338	if (utmpent && chdir(_PATH_RWHODIR)) {
17ccb086 KB	339	syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
221be169 KM	340	exit(1);
221be169 KM	341	}
08d10f57	342	done:
83361bb3	343	(void) alarm(AL_INTERVAL);
52b4fb0c BJ	344	}
	345
	346	getkmem()
	347	{
07cac863 SL	348	static ino_t vmunixino;
	349	static time_t vmunixctime;
	350	struct stat sb;
52b4fb0c	351
17ccb086	352	if (stat(_PATH_UNIX, &sb) < 0) {
07cac863 SL	353	if (vmunixctime)
	354	return;
	355	} else {
	356	if (sb.st_ctime == vmunixctime && sb.st_ino == vmunixino)
	357	return;
	358	vmunixctime = sb.st_ctime;
	359	vmunixino= sb.st_ino;
	360	}
52b4fb0c BJ	361	if (kmemf >= 0)
	362	(void) close(kmemf);
	363	loop:
17ccb086 KB	364	if (nlist(_PATH_UNIX, nl)) {
17ccb086 KB	365	syslog(LOG_WARNING, "%s: namelist botch", _PATH_UNIX);
52b4fb0c BJ	366	sleep(300);
	367	goto loop;
	368	}
17ccb086	369	kmemf = open(_PATH_KMEM, O_RDONLY, 0);
52b4fb0c	370	if (kmemf < 0) {
17ccb086	371	syslog(LOG_ERR, "%s: %m", _PATH_KMEM);
00cdc205	372	exit(1);
52b4fb0c	373	}
9bd66dcf SL	374	(void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, L_SET);
	375	(void) read(kmemf, (char *)&mywd.wd_boottime,
	376	sizeof (mywd.wd_boottime));
b1456c48	377	mywd.wd_boottime = htonl(mywd.wd_boottime);
52b4fb0c	378	}
7af17b3e SL	379
	380	/*
	381	* Figure out device configuration and select
	382	* networks which deserve status information.
	383	*/
	384	configure(s)
	385	int s;
	386	{
	387	char buf[BUFSIZ];
	388	struct ifconf ifc;
	389	struct ifreq ifreq, *ifr;
7af17b3e SL	390	struct sockaddr_in *sin;
7af17b3e SL	391	register struct neighbor *np;
9bd66dcf	392	int n;
7af17b3e SL	393
	394	ifc.ifc_len = sizeof (buf);
	395	ifc.ifc_buf = buf;
	396	if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
00cdc205	397	syslog(LOG_ERR, "ioctl (get interface configuration)");
7af17b3e SL	398	return (0);
	399	}
	400	ifr = ifc.ifc_req;
	401	for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) {
	402	for (np = neighbors; np != NULL; np = np->n_next)
	403	if (np->n_name &&
	404	strcmp(ifr->ifr_name, np->n_name) == 0)
	405	break;
	406	if (np != NULL)
	407	continue;
	408	ifreq = *ifr;
	409	np = (struct neighbor )malloc(sizeof (np));
	410	if (np == NULL)
	411	continue;
	412	np->n_name = malloc(strlen(ifr->ifr_name) + 1);
	413	if (np->n_name == NULL) {
	414	free((char *)np);
	415	continue;
	416	}
	417	strcpy(np->n_name, ifr->ifr_name);
	418	np->n_addrlen = sizeof (ifr->ifr_addr);
	419	np->n_addr = malloc(np->n_addrlen);
	420	if (np->n_addr == NULL) {
	421	free(np->n_name);
	422	free((char *)np);
	423	continue;
	424	}
	425	bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
	426	if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
00cdc205	427	syslog(LOG_ERR, "ioctl (get interface flags)");
7af17b3e SL	428	free((char *)np);
	429	continue;
	430	}
64b7ee70 MK	431	if ((ifreq.ifr_flags & IFF_UP) == 0 \|\|
64b7ee70 MK	432	(ifreq.ifr_flags & (IFF_BROADCAST\|IFF_POINTOPOINT)) == 0) {
7af17b3e SL	433	free((char *)np);
	434	continue;
	435	}
	436	np->n_flags = ifreq.ifr_flags;
	437	if (np->n_flags & IFF_POINTOPOINT) {
	438	if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
00cdc205	439	syslog(LOG_ERR, "ioctl (get dstaddr)");
7af17b3e SL	440	free((char *)np);
	441	continue;
	442	}
	443	/* we assume addresses are all the same size */
	444	bcopy((char *)&ifreq.ifr_dstaddr,
	445	np->n_addr, np->n_addrlen);
	446	}
	447	if (np->n_flags & IFF_BROADCAST) {
64b7ee70 MK	448	if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
	449	syslog(LOG_ERR, "ioctl (get broadaddr)");
	450	free((char *)np);
	451	continue;
	452	}
7af17b3e	453	/* we assume addresses are all the same size */
64b7ee70 MK	454	bcopy((char *)&ifreq.ifr_broadaddr,
64b7ee70 MK	455	np->n_addr, np->n_addrlen);
7af17b3e SL	456	}
	457	/* gag, wish we could get rid of Internet dependencies */
	458	sin = (struct sockaddr_in *)np->n_addr;
	459	sin->sin_port = sp->s_port;
	460	np->n_next = neighbors;
	461	neighbors = np;
	462	}
	463	return (1);
	464	}
b1456c48 SL	465
	466	#ifdef DEBUG
	467	sendto(s, buf, cc, flags, to, tolen)
	468	int s;
	469	char *buf;
	470	int cc, flags;
	471	char *to;
	472	int tolen;
	473	{
	474	register struct whod w = (struct whod )buf;
	475	register struct whoent *we;
	476	struct sockaddr_in sin = (struct sockaddr_in )to;
	477	char *interval();
	478
	479	printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port));
	480	printf("hostname %s %s\n", w->wd_hostname,
9bd66dcf	481	interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
b1456c48	482	printf("load %4.2f, %4.2f, %4.2f\n",
9bd66dcf SL	483	ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
9bd66dcf SL	484	ntohl(w->wd_loadav[2]) / 100.0);
b1456c48 SL	485	cc -= WHDRSIZE;
b1456c48 SL	486	for (we = w->wd_we, cc /= sizeof (struct whoent); cc > 0; cc--, we++) {
9bd66dcf	487	time_t t = ntohl(we->we_utmp.out_time);
b1456c48	488	printf("%-8.8s %s:%s %.12s",
9bd66dcf SL	489	we->we_utmp.out_name,
	490	w->wd_hostname, we->we_utmp.out_line,
	491	ctime(&t)+4);
	492	we->we_idle = ntohl(we->we_idle) / 60;
b1456c48 SL	493	if (we->we_idle) {
	494	if (we->we_idle >= 100*60)
	495	we->we_idle = 100*60 - 1;
	496	if (we->we_idle >= 60)
	497	printf(" %2d", we->we_idle / 60);
	498	else
	499	printf(" ");
	500	printf(":%02d", we->we_idle % 60);
	501	}
	502	printf("\n");
	503	}
	504	}
	505
	506	char *
	507	interval(time, updown)
	508	int time;
	509	char *updown;
	510	{
	511	static char resbuf[32];
	512	int days, hours, minutes;
	513
	514	if (time < 0 \|\| time > 330246060) {
	515	(void) sprintf(resbuf, " %s ??:??", updown);
	516	return (resbuf);
	517	}
	518	minutes = (time + 59) / 60; /* round to minutes */
	519	hours = minutes / 60; minutes %= 60;
	520	days = hours / 24; hours %= 24;
	521	if (days)
	522	(void) sprintf(resbuf, "%s %2d+%02d:%02d",
	523	updown, days, hours, minutes);
	524	else
	525	(void) sprintf(resbuf, "%s %2d:%02d",
	526	updown, hours, minutes);
	527	return (resbuf);
	528	}
	529	#endif