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

/*
 * Copyright (c) 1983 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#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	5.20 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.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;

char	myname[MAXHOSTNAMELEN];

struct	nlist nl[] = {
#define	NL_BOOTTIME	0
	{ "_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;
char	*strcpy(), *malloc();
long	lseek();
void	getkmem(), onalrm();
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
	daemon(1, 0);
#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_family = AF_INET;
	sin.sin_port = sp->s_port;
	if (bind(s, (struct sockaddr *)&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,
			(struct sockaddr *)&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;
		}
		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 ENDIAN != BIG_ENDIAN
		{
			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((time_t *)&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;

void
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) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
	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,
			(struct sockaddr *)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);
}

void
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], *cp, *cplim;
	struct ifconf ifc;
	struct ifreq ifreq, *ifr;
	struct sockaddr_in *sin;
	register struct neighbor *np;

	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;
#ifdef AF_LINK
#define max(a, b) (a > b ? a : b)
#define size(p)	max((p).sa_len, sizeof(p))
#else
#define size(p) (sizeof (p))
#endif
	cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
	for (cp = buf; cp < cplim;
			cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
		ifr = (struct ifreq *)cp;
		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	*
417f7a11	5	* %sccs.include.redist.c%
3b86b0f6 DF	6	*/
	7
	8	#ifndef lint
	9	char copyright[] =
86f08f99	10	"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
3b86b0f6	11	All rights reserved.\n";
86f08f99	12	#endif /* not lint */
3b86b0f6	13
52b4fb0c	14	#ifndef lint
0df908a9	15	static char sccsid[] = "@(#)rwhod.c 5.20 (Berkeley) %G%";
86f08f99	16	#endif /* not lint */
52b4fb0c	17
b584098b	18	#include <sys/param.h>
52b4fb0c	19	#include <sys/socket.h>
52b4fb0c	20	#include <sys/stat.h>
17ccb086	21	#include <sys/signal.h>
52b4fb0c	22	#include <sys/ioctl.h>
9bd66dcf	23	#include <sys/file.h>
de3b21e8	24
7af17b3e	25	#include <net/if.h>
de3b21e8 SL	26	#include <netinet/in.h>
	27
	28	#include <nlist.h>
de3b21e8 SL	29	#include <errno.h>
de3b21e8 SL	30	#include <utmp.h>
a0f59ac1 SL	31	#include <ctype.h>
a0f59ac1 SL	32	#include <netdb.h>
00cdc205	33	#include <syslog.h>
3c13756b	34	#include <protocols/rwhod.h>
17ccb086	35	#include <stdio.h>
7abf8d65	36	#include <paths.h>
de3b21e8	37
83361bb3 RC	38	/*
	39	* Alarm interval. Don't forget to change the down time check in ruptime
	40	* if this is changed.
	41	*/
00cdc205	42	#define AL_INTERVAL (3 * 60)
83361bb3	43
b584098b	44	struct sockaddr_in sin;
52b4fb0c	45
b584098b	46	char myname[MAXHOSTNAMELEN];
52b4fb0c BJ	47
52b4fb0c BJ	48	struct nlist nl[] = {
4b8ee582	49	#define NL_BOOTTIME 0
de3b21e8	50	{ "_boottime" },
52b4fb0c BJ	51	0
	52	};
	53
7af17b3e SL	54	/*
	55	* We communicate with each neighbor in
	56	* a list constructed at the time we're
	57	* started up. Neighbors are currently
	58	* directly connected via a hardware interface.
	59	*/
	60	struct neighbor {
	61	struct neighbor *n_next;
	62	char n_name; / interface name */
	63	char n_addr; / who to send to */
	64	int n_addrlen; /* size of address */
	65	int n_flags; /* should forward?, interface flags */
	66	};
	67
	68	struct neighbor *neighbors;
52b4fb0c	69	struct whod mywd;
7af17b3e	70	struct servent *sp;
52b4fb0c BJ	71	int s, utmpf, kmemf = -1;
52b4fb0c BJ	72
7af17b3e	73	#define WHDRSIZE (sizeof (mywd) - sizeof (mywd.wd_we))
fea387f0	74
17ccb086	75	extern int errno;
9bd38ba8	76	char strcpy(), malloc();
52b4fb0c	77	long lseek();
0df908a9	78	void getkmem(), onalrm();
7af17b3e	79	struct in_addr inet_makeaddr();
52b4fb0c BJ	80
	81	main()
	82	{
	83	struct sockaddr_in from;
0f2d5e68	84	struct stat st;
52b4fb0c	85	char path[64];
221be169	86	int on = 1;
17ccb086	87	char cp, index(), *strerror();
52b4fb0c	88
00cdc205 RC	89	if (getuid()) {
	90	fprintf(stderr, "rwhod: not super user\n");
	91	exit(1);
	92	}
a0f59ac1 SL	93	sp = getservbyname("who", "udp");
	94	if (sp == 0) {
	95	fprintf(stderr, "rwhod: udp/who: unknown service\n");
	96	exit(1);
	97	}
52b4fb0c	98	#ifndef DEBUG
afe907a4	99	daemon(1, 0);
52b4fb0c	100	#endif
17ccb086 KB	101	if (chdir(_PATH_RWHODIR) < 0) {
	102	(void)fprintf(stderr, "rwhod: %s: %s\n",
	103	_PATH_RWHODIR, strerror(errno));
ac82a1ec KM	104	exit(1);
ac82a1ec KM	105	}
52b4fb0c	106	(void) signal(SIGHUP, getkmem);
076ae92c	107	openlog("rwhod", LOG_PID, LOG_DAEMON);
7af17b3e SL	108	/*
	109	* Establish host name as returned by system.
	110	*/
	111	if (gethostname(myname, sizeof (myname) - 1) < 0) {
00cdc205	112	syslog(LOG_ERR, "gethostname: %m");
52b4fb0c BJ	113	exit(1);
52b4fb0c BJ	114	}
d2444544 JB	115	if ((cp = index(myname, '.')) != NULL)
d2444544 JB	116	*cp = '\0';
7af17b3e	117	strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
17ccb086	118	utmpf = open(_PATH_UTMP, O_RDONLY\|O_CREAT, 0644);
52b4fb0c	119	if (utmpf < 0) {
17ccb086	120	syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
52b4fb0c BJ	121	exit(1);
	122	}
	123	getkmem();
9bd66dcf	124	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
00cdc205	125	syslog(LOG_ERR, "socket: %m");
de3b21e8 SL	126	exit(1);
de3b21e8 SL	127	}
3de1986a	128	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
b0e1e5f3 MK	129	syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
	130	exit(1);
	131	}
b584098b	132	sin.sin_family = AF_INET;
7af17b3e	133	sin.sin_port = sp->s_port;
0df908a9	134	if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
00cdc205	135	syslog(LOG_ERR, "bind: %m");
de3b21e8	136	exit(1);
52b4fb0c	137	}
7af17b3e SL	138	if (!configure(s))
7af17b3e SL	139	exit(1);
8a53982e	140	signal(SIGALRM, onalrm);
52b4fb0c BJ	141	onalrm();
	142	for (;;) {
	143	struct whod wd;
7af17b3e	144	int cc, whod, len = sizeof (from);
52b4fb0c	145
7af17b3e	146	cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
0df908a9	147	(struct sockaddr *)&from, &len);
52b4fb0c BJ	148	if (cc <= 0) {
52b4fb0c BJ	149	if (cc < 0 && errno != EINTR)
00cdc205	150	syslog(LOG_WARNING, "recv: %m");
52b4fb0c BJ	151	continue;
52b4fb0c BJ	152	}
a0f59ac1	153	if (from.sin_port != sp->s_port) {
00cdc205	154	syslog(LOG_WARNING, "%d: bad from port",
a0f59ac1	155	ntohs(from.sin_port));
52b4fb0c BJ	156	continue;
52b4fb0c BJ	157	}
aaddf8a1 SL	158	if (wd.wd_vers != WHODVERSION)
aaddf8a1 SL	159	continue;
7af17b3e SL	160	if (wd.wd_type != WHODTYPE_STATUS)
7af17b3e SL	161	continue;
a0f59ac1	162	if (!verify(wd.wd_hostname)) {
00cdc205	163	syslog(LOG_WARNING, "malformed host name from %x",
a0f59ac1	164	from.sin_addr);
52b4fb0c BJ	165	continue;
52b4fb0c BJ	166	}
ac82a1ec	167	(void) sprintf(path, "whod.%s", wd.wd_hostname);
0f2d5e68 MK	168	/*
	169	* Rather than truncating and growing the file each time,
	170	* use ftruncate if size is less than previous size.
	171	*/
	172	whod = open(path, O_WRONLY \| O_CREAT, 0644);
52b4fb0c	173	if (whod < 0) {
00cdc205	174	syslog(LOG_WARNING, "%s: %m", path);
52b4fb0c BJ	175	continue;
52b4fb0c BJ	176	}
b584098b	177	#if ENDIAN != BIG_ENDIAN
fea387f0	178	{
9bd66dcf	179	int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
fea387f0 SL	180	struct whoent *we;
	181
	182	/* undo header byte swapping before writing to file */
	183	wd.wd_sendtime = ntohl(wd.wd_sendtime);
	184	for (i = 0; i < 3; i++)
	185	wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
	186	wd.wd_boottime = ntohl(wd.wd_boottime);
	187	we = wd.wd_we;
	188	for (i = 0; i < n; i++) {
	189	we->we_idle = ntohl(we->we_idle);
1cccbcb3 SL	190	we->we_utmp.out_time =
1cccbcb3 SL	191	ntohl(we->we_utmp.out_time);
fea387f0 SL	192	we++;
	193	}
	194	}
	195	#endif
0df908a9	196	(void) time((time_t *)&wd.wd_recvtime);
52b4fb0c	197	(void) write(whod, (char *)&wd, cc);
0f2d5e68 MK	198	if (fstat(whod, &st) < 0 \|\| st.st_size > cc)
0f2d5e68 MK	199	ftruncate(whod, cc);
52b4fb0c BJ	200	(void) close(whod);
	201	}
	202	}
	203
a0f59ac1 SL	204	/*
	205	* Check out host name for unprintables
	206	* and other funnies before allowing a file
	207	* to be created. Sorry, but blanks aren't allowed.
	208	*/
	209	verify(name)
	210	register char *name;
	211	{
	212	register int size = 0;
	213
	214	while (*name) {
77650176	215	if (!isascii(name) \|\| !(isalnum(name) \|\| ispunct(*name)))
a0f59ac1 SL	216	return (0);
	217	name++, size++;
	218	}
	219	return (size > 0);
	220	}
	221
52b4fb0c BJ	222	int utmptime;
52b4fb0c BJ	223	int utmpent;
4c9b3acd JB	224	int utmpsize = 0;
4c9b3acd JB	225	struct utmp *utmp;
52b4fb0c BJ	226	int alarmcount;
52b4fb0c BJ	227
0df908a9	228	void
52b4fb0c BJ	229	onalrm()
52b4fb0c BJ	230	{
17ccb086 KB	231	register struct neighbor *np;
17ccb086 KB	232	register struct whoent we = mywd.wd_we, wlast;
52b4fb0c BJ	233	register int i;
52b4fb0c BJ	234	struct stat stb;
52b4fb0c BJ	235	int cc;
52b4fb0c BJ	236	double avenrun[3];
17ccb086 KB	237	time_t now = time((time_t *)NULL);
17ccb086 KB	238	char *strerror();
52b4fb0c BJ	239
	240	if (alarmcount % 10 == 0)
	241	getkmem();
	242	alarmcount++;
	243	(void) fstat(utmpf, &stb);
4c9b3acd	244	if ((stb.st_mtime != utmptime) \|\| (stb.st_size > utmpsize)) {
02d31241	245	utmptime = stb.st_mtime;
4c9b3acd JB	246	if (stb.st_size > utmpsize) {
	247	utmpsize = stb.st_size + 10 * sizeof(struct utmp);
	248	if (utmp)
	249	utmp = (struct utmp *)realloc(utmp, utmpsize);
	250	else
	251	utmp = (struct utmp *)malloc(utmpsize);
	252	if (! utmp) {
	253	fprintf(stderr, "rwhod: malloc failed\n");
	254	utmpsize = 0;
	255	goto done;
	256	}
	257	}
9bd66dcf	258	(void) lseek(utmpf, (long)0, L_SET);
4c9b3acd	259	cc = read(utmpf, (char *)utmp, stb.st_size);
52b4fb0c	260	if (cc < 0) {
17ccb086 KB	261	fprintf(stderr, "rwhod: %s: %s\n",
17ccb086 KB	262	_PATH_UTMP, strerror(errno));
08d10f57	263	goto done;
52b4fb0c	264	}
7af17b3e	265	wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
52b4fb0c BJ	266	utmpent = cc / sizeof (struct utmp);
	267	for (i = 0; i < utmpent; i++)
	268	if (utmp[i].ut_name[0]) {
b1456c48 SL	269	bcopy(utmp[i].ut_line, we->we_utmp.out_line,
	270	sizeof (utmp[i].ut_line));
	271	bcopy(utmp[i].ut_name, we->we_utmp.out_name,
	272	sizeof (utmp[i].ut_name));
b1456c48	273	we->we_utmp.out_time = htonl(utmp[i].ut_time);
76886f32 SL	274	if (we >= wlast)
76886f32 SL	275	break;
52b4fb0c BJ	276	we++;
	277	}
	278	utmpent = we - mywd.wd_we;
	279	}
221be169 KM	280
	281	/*
	282	* The test on utmpent looks silly---after all, if no one is
	283	* logged on, why worry about efficiency?---but is useful on
	284	* (e.g.) compute servers.
	285	*/
7abf8d65 KB	286	if (utmpent && chdir(_PATH_DEV)) {
7abf8d65 KB	287	syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
221be169 KM	288	exit(1);
221be169 KM	289	}
52b4fb0c BJ	290	we = mywd.wd_we;
52b4fb0c BJ	291	for (i = 0; i < utmpent; i++) {
221be169	292	if (stat(we->we_utmp.out_line, &stb) >= 0)
b1456c48	293	we->we_idle = htonl(now - stb.st_atime);
52b4fb0c BJ	294	we++;
52b4fb0c BJ	295	}
4b8ee582	296	(void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
52b4fb0c	297	for (i = 0; i < 3; i++)
353c1281	298	mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
b1456c48	299	cc = (char )we - (char )&mywd;
b1456c48	300	mywd.wd_sendtime = htonl(time(0));
7af17b3e SL	301	mywd.wd_vers = WHODVERSION;
	302	mywd.wd_type = WHODTYPE_STATUS;
	303	for (np = neighbors; np != NULL; np = np->n_next)
	304	(void) sendto(s, (char *)&mywd, cc, 0,
0df908a9	305	(struct sockaddr *)np->n_addr, np->n_addrlen);
17ccb086 KB	306	if (utmpent && chdir(_PATH_RWHODIR)) {
17ccb086 KB	307	syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
221be169 KM	308	exit(1);
221be169 KM	309	}
08d10f57	310	done:
83361bb3	311	(void) alarm(AL_INTERVAL);
52b4fb0c BJ	312	}
52b4fb0c BJ	313
0df908a9	314	void
52b4fb0c BJ	315	getkmem()
52b4fb0c BJ	316	{
07cac863 SL	317	static ino_t vmunixino;
	318	static time_t vmunixctime;
	319	struct stat sb;
52b4fb0c	320
17ccb086	321	if (stat(_PATH_UNIX, &sb) < 0) {
07cac863 SL	322	if (vmunixctime)
	323	return;
	324	} else {
	325	if (sb.st_ctime == vmunixctime && sb.st_ino == vmunixino)
	326	return;
	327	vmunixctime = sb.st_ctime;
	328	vmunixino= sb.st_ino;
	329	}
52b4fb0c BJ	330	if (kmemf >= 0)
	331	(void) close(kmemf);
	332	loop:
17ccb086 KB	333	if (nlist(_PATH_UNIX, nl)) {
17ccb086 KB	334	syslog(LOG_WARNING, "%s: namelist botch", _PATH_UNIX);
52b4fb0c BJ	335	sleep(300);
	336	goto loop;
	337	}
17ccb086	338	kmemf = open(_PATH_KMEM, O_RDONLY, 0);
52b4fb0c	339	if (kmemf < 0) {
17ccb086	340	syslog(LOG_ERR, "%s: %m", _PATH_KMEM);
00cdc205	341	exit(1);
52b4fb0c	342	}
9bd66dcf SL	343	(void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, L_SET);
	344	(void) read(kmemf, (char *)&mywd.wd_boottime,
	345	sizeof (mywd.wd_boottime));
b1456c48	346	mywd.wd_boottime = htonl(mywd.wd_boottime);
52b4fb0c	347	}
7af17b3e SL	348
	349	/*
	350	* Figure out device configuration and select
	351	* networks which deserve status information.
	352	*/
	353	configure(s)
	354	int s;
	355	{
25a88e81	356	char buf[BUFSIZ], cp, cplim;
7af17b3e SL	357	struct ifconf ifc;
7af17b3e SL	358	struct ifreq ifreq, *ifr;
7af17b3e SL	359	struct sockaddr_in *sin;
	360	register struct neighbor *np;
	361
	362	ifc.ifc_len = sizeof (buf);
	363	ifc.ifc_buf = buf;
	364	if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
00cdc205	365	syslog(LOG_ERR, "ioctl (get interface configuration)");
7af17b3e SL	366	return (0);
	367	}
	368	ifr = ifc.ifc_req;
d4a5bf04	369	#ifdef AF_LINK
25a88e81 KS	370	#define max(a, b) (a > b ? a : b)
	371	#define size(p) max((p).sa_len, sizeof(p))
	372	#else
	373	#define size(p) (sizeof (p))
	374	#endif
	375	cplim = buf + ifc.ifc_len; /skip over if's with big ifr_addr's /
	376	for (cp = buf; cp < cplim;
	377	cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
	378	ifr = (struct ifreq *)cp;
7af17b3e SL	379	for (np = neighbors; np != NULL; np = np->n_next)
	380	if (np->n_name &&
	381	strcmp(ifr->ifr_name, np->n_name) == 0)
	382	break;
	383	if (np != NULL)
	384	continue;
	385	ifreq = *ifr;
	386	np = (struct neighbor )malloc(sizeof (np));
	387	if (np == NULL)
	388	continue;
	389	np->n_name = malloc(strlen(ifr->ifr_name) + 1);
	390	if (np->n_name == NULL) {
	391	free((char *)np);
	392	continue;
	393	}
	394	strcpy(np->n_name, ifr->ifr_name);
	395	np->n_addrlen = sizeof (ifr->ifr_addr);
	396	np->n_addr = malloc(np->n_addrlen);
	397	if (np->n_addr == NULL) {
	398	free(np->n_name);
	399	free((char *)np);
	400	continue;
	401	}
	402	bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
	403	if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
00cdc205	404	syslog(LOG_ERR, "ioctl (get interface flags)");
7af17b3e SL	405	free((char *)np);
	406	continue;
	407	}
64b7ee70 MK	408	if ((ifreq.ifr_flags & IFF_UP) == 0 \|\|
64b7ee70 MK	409	(ifreq.ifr_flags & (IFF_BROADCAST\|IFF_POINTOPOINT)) == 0) {
7af17b3e SL	410	free((char *)np);
	411	continue;
	412	}
	413	np->n_flags = ifreq.ifr_flags;
	414	if (np->n_flags & IFF_POINTOPOINT) {
	415	if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
00cdc205	416	syslog(LOG_ERR, "ioctl (get dstaddr)");
7af17b3e SL	417	free((char *)np);
	418	continue;
	419	}
	420	/* we assume addresses are all the same size */
	421	bcopy((char *)&ifreq.ifr_dstaddr,
	422	np->n_addr, np->n_addrlen);
	423	}
	424	if (np->n_flags & IFF_BROADCAST) {
64b7ee70 MK	425	if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
	426	syslog(LOG_ERR, "ioctl (get broadaddr)");
	427	free((char *)np);
	428	continue;
	429	}
7af17b3e	430	/* we assume addresses are all the same size */
64b7ee70 MK	431	bcopy((char *)&ifreq.ifr_broadaddr,
64b7ee70 MK	432	np->n_addr, np->n_addrlen);
7af17b3e SL	433	}
	434	/* gag, wish we could get rid of Internet dependencies */
	435	sin = (struct sockaddr_in *)np->n_addr;
	436	sin->sin_port = sp->s_port;
	437	np->n_next = neighbors;
	438	neighbors = np;
	439	}
	440	return (1);
	441	}
b1456c48 SL	442
	443	#ifdef DEBUG
	444	sendto(s, buf, cc, flags, to, tolen)
	445	int s;
	446	char *buf;
	447	int cc, flags;
	448	char *to;
	449	int tolen;
	450	{
	451	register struct whod w = (struct whod )buf;
	452	register struct whoent *we;
	453	struct sockaddr_in sin = (struct sockaddr_in )to;
	454	char *interval();
	455
	456	printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port));
	457	printf("hostname %s %s\n", w->wd_hostname,
9bd66dcf	458	interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
b1456c48	459	printf("load %4.2f, %4.2f, %4.2f\n",
9bd66dcf SL	460	ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
9bd66dcf SL	461	ntohl(w->wd_loadav[2]) / 100.0);
b1456c48 SL	462	cc -= WHDRSIZE;
b1456c48 SL	463	for (we = w->wd_we, cc /= sizeof (struct whoent); cc > 0; cc--, we++) {
9bd66dcf	464	time_t t = ntohl(we->we_utmp.out_time);
b1456c48	465	printf("%-8.8s %s:%s %.12s",
9bd66dcf SL	466	we->we_utmp.out_name,
	467	w->wd_hostname, we->we_utmp.out_line,
	468	ctime(&t)+4);
	469	we->we_idle = ntohl(we->we_idle) / 60;
b1456c48 SL	470	if (we->we_idle) {
	471	if (we->we_idle >= 100*60)
	472	we->we_idle = 100*60 - 1;
	473	if (we->we_idle >= 60)
	474	printf(" %2d", we->we_idle / 60);
	475	else
	476	printf(" ");
	477	printf(":%02d", we->we_idle % 60);
	478	}
	479	printf("\n");
	480	}
	481	}
	482
	483	char *
	484	interval(time, updown)
	485	int time;
	486	char *updown;
	487	{
	488	static char resbuf[32];
	489	int days, hours, minutes;
	490
	491	if (time < 0 \|\| time > 330246060) {
	492	(void) sprintf(resbuf, " %s ??:??", updown);
	493	return (resbuf);
	494	}
	495	minutes = (time + 59) / 60; /* round to minutes */
	496	hours = minutes / 60; minutes %= 60;
	497	days = hours / 24; hours %= 24;
	498	if (days)
	499	(void) sprintf(resbuf, "%s %2d+%02d:%02d",
	500	updown, days, hours, minutes);
	501	else
	502	(void) sprintf(resbuf, "%s %2d:%02d",
	503	updown, hours, minutes);
	504	return (resbuf);
	505	}
	506	#endif