[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	5.16 (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;
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_family = AF_INET;
	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;
		}
		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(&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) 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,
			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	*
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
417f7a11	15	static char sccsid[] = "@(#)rwhod.c 5.16 (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;
52b4fb0c	76	int onalrm();
9bd38ba8	77	char strcpy(), malloc();
52b4fb0c BJ	78	long lseek();
52b4fb0c BJ	79	int getkmem();
7af17b3e	80	struct in_addr inet_makeaddr();
52b4fb0c BJ	81
	82	main()
	83	{
	84	struct sockaddr_in from;
0f2d5e68	85	struct stat st;
52b4fb0c	86	char path[64];
221be169	87	int on = 1;
17ccb086	88	char cp, index(), *strerror();
52b4fb0c	89
00cdc205 RC	90	if (getuid()) {
	91	fprintf(stderr, "rwhod: not super user\n");
	92	exit(1);
	93	}
a0f59ac1 SL	94	sp = getservbyname("who", "udp");
	95	if (sp == 0) {
	96	fprintf(stderr, "rwhod: udp/who: unknown service\n");
	97	exit(1);
	98	}
52b4fb0c BJ	99	#ifndef DEBUG
	100	if (fork())
	101	exit(0);
	102	{ int s;
	103	for (s = 0; s < 10; s++)
	104	(void) close(s);
	105	(void) open("/", 0);
	106	(void) dup2(0, 1);
	107	(void) dup2(0, 2);
7abf8d65	108	s = open(_PATH_TTY, 2);
52b4fb0c BJ	109	if (s >= 0) {
	110	ioctl(s, TIOCNOTTY, 0);
	111	(void) close(s);
	112	}
	113	}
	114	#endif
17ccb086 KB	115	if (chdir(_PATH_RWHODIR) < 0) {
	116	(void)fprintf(stderr, "rwhod: %s: %s\n",
	117	_PATH_RWHODIR, strerror(errno));
ac82a1ec KM	118	exit(1);
ac82a1ec KM	119	}
52b4fb0c	120	(void) signal(SIGHUP, getkmem);
076ae92c	121	openlog("rwhod", LOG_PID, LOG_DAEMON);
7af17b3e SL	122	/*
	123	* Establish host name as returned by system.
	124	*/
	125	if (gethostname(myname, sizeof (myname) - 1) < 0) {
00cdc205	126	syslog(LOG_ERR, "gethostname: %m");
52b4fb0c BJ	127	exit(1);
52b4fb0c BJ	128	}
d2444544 JB	129	if ((cp = index(myname, '.')) != NULL)
d2444544 JB	130	*cp = '\0';
7af17b3e	131	strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
17ccb086	132	utmpf = open(_PATH_UTMP, O_RDONLY\|O_CREAT, 0644);
52b4fb0c	133	if (utmpf < 0) {
17ccb086	134	syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
52b4fb0c BJ	135	exit(1);
	136	}
	137	getkmem();
9bd66dcf	138	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
00cdc205	139	syslog(LOG_ERR, "socket: %m");
de3b21e8 SL	140	exit(1);
de3b21e8 SL	141	}
3de1986a	142	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
b0e1e5f3 MK	143	syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
	144	exit(1);
	145	}
b584098b	146	sin.sin_family = AF_INET;
7af17b3e	147	sin.sin_port = sp->s_port;
9bd66dcf	148	if (bind(s, &sin, sizeof (sin)) < 0) {
00cdc205	149	syslog(LOG_ERR, "bind: %m");
de3b21e8	150	exit(1);
52b4fb0c	151	}
7af17b3e SL	152	if (!configure(s))
7af17b3e SL	153	exit(1);
8a53982e	154	signal(SIGALRM, onalrm);
52b4fb0c BJ	155	onalrm();
	156	for (;;) {
	157	struct whod wd;
7af17b3e	158	int cc, whod, len = sizeof (from);
52b4fb0c	159
7af17b3e SL	160	cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
7af17b3e SL	161	&from, &len);
52b4fb0c BJ	162	if (cc <= 0) {
52b4fb0c BJ	163	if (cc < 0 && errno != EINTR)
00cdc205	164	syslog(LOG_WARNING, "recv: %m");
52b4fb0c BJ	165	continue;
52b4fb0c BJ	166	}
a0f59ac1	167	if (from.sin_port != sp->s_port) {
00cdc205	168	syslog(LOG_WARNING, "%d: bad from port",
a0f59ac1	169	ntohs(from.sin_port));
52b4fb0c BJ	170	continue;
52b4fb0c BJ	171	}
aaddf8a1 SL	172	if (wd.wd_vers != WHODVERSION)
aaddf8a1 SL	173	continue;
7af17b3e SL	174	if (wd.wd_type != WHODTYPE_STATUS)
7af17b3e SL	175	continue;
a0f59ac1	176	if (!verify(wd.wd_hostname)) {
00cdc205	177	syslog(LOG_WARNING, "malformed host name from %x",
a0f59ac1	178	from.sin_addr);
52b4fb0c BJ	179	continue;
52b4fb0c BJ	180	}
ac82a1ec	181	(void) sprintf(path, "whod.%s", wd.wd_hostname);
0f2d5e68 MK	182	/*
	183	* Rather than truncating and growing the file each time,
	184	* use ftruncate if size is less than previous size.
	185	*/
	186	whod = open(path, O_WRONLY \| O_CREAT, 0644);
52b4fb0c	187	if (whod < 0) {
00cdc205	188	syslog(LOG_WARNING, "%s: %m", path);
52b4fb0c BJ	189	continue;
52b4fb0c BJ	190	}
b584098b	191	#if ENDIAN != BIG_ENDIAN
fea387f0	192	{
9bd66dcf	193	int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
fea387f0 SL	194	struct whoent *we;
	195
	196	/* undo header byte swapping before writing to file */
	197	wd.wd_sendtime = ntohl(wd.wd_sendtime);
	198	for (i = 0; i < 3; i++)
	199	wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
	200	wd.wd_boottime = ntohl(wd.wd_boottime);
	201	we = wd.wd_we;
	202	for (i = 0; i < n; i++) {
	203	we->we_idle = ntohl(we->we_idle);
1cccbcb3 SL	204	we->we_utmp.out_time =
1cccbcb3 SL	205	ntohl(we->we_utmp.out_time);
fea387f0 SL	206	we++;
	207	}
	208	}
	209	#endif
52b4fb0c BJ	210	(void) time(&wd.wd_recvtime);
52b4fb0c BJ	211	(void) write(whod, (char *)&wd, cc);
0f2d5e68 MK	212	if (fstat(whod, &st) < 0 \|\| st.st_size > cc)
0f2d5e68 MK	213	ftruncate(whod, cc);
52b4fb0c BJ	214	(void) close(whod);
	215	}
	216	}
	217
a0f59ac1 SL	218	/*
	219	* Check out host name for unprintables
	220	* and other funnies before allowing a file
	221	* to be created. Sorry, but blanks aren't allowed.
	222	*/
	223	verify(name)
	224	register char *name;
	225	{
	226	register int size = 0;
	227
	228	while (*name) {
77650176	229	if (!isascii(name) \|\| !(isalnum(name) \|\| ispunct(*name)))
a0f59ac1 SL	230	return (0);
	231	name++, size++;
	232	}
	233	return (size > 0);
	234	}
	235
52b4fb0c BJ	236	int utmptime;
52b4fb0c BJ	237	int utmpent;
4c9b3acd JB	238	int utmpsize = 0;
4c9b3acd JB	239	struct utmp *utmp;
52b4fb0c BJ	240	int alarmcount;
	241
	242	onalrm()
	243	{
17ccb086 KB	244	register struct neighbor *np;
17ccb086 KB	245	register struct whoent we = mywd.wd_we, wlast;
52b4fb0c BJ	246	register int i;
52b4fb0c BJ	247	struct stat stb;
52b4fb0c BJ	248	int cc;
52b4fb0c BJ	249	double avenrun[3];
17ccb086 KB	250	time_t now = time((time_t *)NULL);
17ccb086 KB	251	char *strerror();
52b4fb0c BJ	252
	253	if (alarmcount % 10 == 0)
	254	getkmem();
	255	alarmcount++;
	256	(void) fstat(utmpf, &stb);
4c9b3acd	257	if ((stb.st_mtime != utmptime) \|\| (stb.st_size > utmpsize)) {
02d31241	258	utmptime = stb.st_mtime;
4c9b3acd JB	259	if (stb.st_size > utmpsize) {
	260	utmpsize = stb.st_size + 10 * sizeof(struct utmp);
	261	if (utmp)
	262	utmp = (struct utmp *)realloc(utmp, utmpsize);
	263	else
	264	utmp = (struct utmp *)malloc(utmpsize);
	265	if (! utmp) {
	266	fprintf(stderr, "rwhod: malloc failed\n");
	267	utmpsize = 0;
	268	goto done;
	269	}
	270	}
9bd66dcf	271	(void) lseek(utmpf, (long)0, L_SET);
4c9b3acd	272	cc = read(utmpf, (char *)utmp, stb.st_size);
52b4fb0c	273	if (cc < 0) {
17ccb086 KB	274	fprintf(stderr, "rwhod: %s: %s\n",
17ccb086 KB	275	_PATH_UTMP, strerror(errno));
08d10f57	276	goto done;
52b4fb0c	277	}
7af17b3e	278	wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
52b4fb0c BJ	279	utmpent = cc / sizeof (struct utmp);
	280	for (i = 0; i < utmpent; i++)
	281	if (utmp[i].ut_name[0]) {
b1456c48 SL	282	bcopy(utmp[i].ut_line, we->we_utmp.out_line,
	283	sizeof (utmp[i].ut_line));
	284	bcopy(utmp[i].ut_name, we->we_utmp.out_name,
	285	sizeof (utmp[i].ut_name));
b1456c48	286	we->we_utmp.out_time = htonl(utmp[i].ut_time);
76886f32 SL	287	if (we >= wlast)
76886f32 SL	288	break;
52b4fb0c BJ	289	we++;
	290	}
	291	utmpent = we - mywd.wd_we;
	292	}
221be169 KM	293
	294	/*
	295	* The test on utmpent looks silly---after all, if no one is
	296	* logged on, why worry about efficiency?---but is useful on
	297	* (e.g.) compute servers.
	298	*/
7abf8d65 KB	299	if (utmpent && chdir(_PATH_DEV)) {
7abf8d65 KB	300	syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
221be169 KM	301	exit(1);
221be169 KM	302	}
52b4fb0c BJ	303	we = mywd.wd_we;
52b4fb0c BJ	304	for (i = 0; i < utmpent; i++) {
221be169	305	if (stat(we->we_utmp.out_line, &stb) >= 0)
b1456c48	306	we->we_idle = htonl(now - stb.st_atime);
52b4fb0c BJ	307	we++;
52b4fb0c BJ	308	}
4b8ee582	309	(void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
52b4fb0c	310	for (i = 0; i < 3; i++)
353c1281	311	mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
b1456c48	312	cc = (char )we - (char )&mywd;
b1456c48	313	mywd.wd_sendtime = htonl(time(0));
7af17b3e SL	314	mywd.wd_vers = WHODVERSION;
	315	mywd.wd_type = WHODTYPE_STATUS;
	316	for (np = neighbors; np != NULL; np = np->n_next)
	317	(void) sendto(s, (char *)&mywd, cc, 0,
	318	np->n_addr, np->n_addrlen);
17ccb086 KB	319	if (utmpent && chdir(_PATH_RWHODIR)) {
17ccb086 KB	320	syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
221be169 KM	321	exit(1);
221be169 KM	322	}
08d10f57	323	done:
83361bb3	324	(void) alarm(AL_INTERVAL);
52b4fb0c BJ	325	}
	326
	327	getkmem()
	328	{
07cac863 SL	329	static ino_t vmunixino;
	330	static time_t vmunixctime;
	331	struct stat sb;
52b4fb0c	332
17ccb086	333	if (stat(_PATH_UNIX, &sb) < 0) {
07cac863 SL	334	if (vmunixctime)
	335	return;
	336	} else {
	337	if (sb.st_ctime == vmunixctime && sb.st_ino == vmunixino)
	338	return;
	339	vmunixctime = sb.st_ctime;
	340	vmunixino= sb.st_ino;
	341	}
52b4fb0c BJ	342	if (kmemf >= 0)
	343	(void) close(kmemf);
	344	loop:
17ccb086 KB	345	if (nlist(_PATH_UNIX, nl)) {
17ccb086 KB	346	syslog(LOG_WARNING, "%s: namelist botch", _PATH_UNIX);
52b4fb0c BJ	347	sleep(300);
	348	goto loop;
	349	}
17ccb086	350	kmemf = open(_PATH_KMEM, O_RDONLY, 0);
52b4fb0c	351	if (kmemf < 0) {
17ccb086	352	syslog(LOG_ERR, "%s: %m", _PATH_KMEM);
00cdc205	353	exit(1);
52b4fb0c	354	}
9bd66dcf SL	355	(void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, L_SET);
	356	(void) read(kmemf, (char *)&mywd.wd_boottime,
	357	sizeof (mywd.wd_boottime));
b1456c48	358	mywd.wd_boottime = htonl(mywd.wd_boottime);
52b4fb0c	359	}
7af17b3e SL	360
	361	/*
	362	* Figure out device configuration and select
	363	* networks which deserve status information.
	364	*/
	365	configure(s)
	366	int s;
	367	{
	368	char buf[BUFSIZ];
	369	struct ifconf ifc;
	370	struct ifreq ifreq, *ifr;
7af17b3e SL	371	struct sockaddr_in *sin;
7af17b3e SL	372	register struct neighbor *np;
9bd66dcf	373	int n;
7af17b3e SL	374
	375	ifc.ifc_len = sizeof (buf);
	376	ifc.ifc_buf = buf;
	377	if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
00cdc205	378	syslog(LOG_ERR, "ioctl (get interface configuration)");
7af17b3e SL	379	return (0);
	380	}
	381	ifr = ifc.ifc_req;
	382	for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) {
	383	for (np = neighbors; np != NULL; np = np->n_next)
	384	if (np->n_name &&
	385	strcmp(ifr->ifr_name, np->n_name) == 0)
	386	break;
	387	if (np != NULL)
	388	continue;
	389	ifreq = *ifr;
	390	np = (struct neighbor )malloc(sizeof (np));
	391	if (np == NULL)
	392	continue;
	393	np->n_name = malloc(strlen(ifr->ifr_name) + 1);
	394	if (np->n_name == NULL) {
	395	free((char *)np);
	396	continue;
	397	}
	398	strcpy(np->n_name, ifr->ifr_name);
	399	np->n_addrlen = sizeof (ifr->ifr_addr);
	400	np->n_addr = malloc(np->n_addrlen);
	401	if (np->n_addr == NULL) {
	402	free(np->n_name);
	403	free((char *)np);
	404	continue;
	405	}
	406	bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
	407	if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
00cdc205	408	syslog(LOG_ERR, "ioctl (get interface flags)");
7af17b3e SL	409	free((char *)np);
	410	continue;
	411	}
64b7ee70 MK	412	if ((ifreq.ifr_flags & IFF_UP) == 0 \|\|
64b7ee70 MK	413	(ifreq.ifr_flags & (IFF_BROADCAST\|IFF_POINTOPOINT)) == 0) {
7af17b3e SL	414	free((char *)np);
	415	continue;
	416	}
	417	np->n_flags = ifreq.ifr_flags;
	418	if (np->n_flags & IFF_POINTOPOINT) {
	419	if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
00cdc205	420	syslog(LOG_ERR, "ioctl (get dstaddr)");
7af17b3e SL	421	free((char *)np);
	422	continue;
	423	}
	424	/* we assume addresses are all the same size */
	425	bcopy((char *)&ifreq.ifr_dstaddr,
	426	np->n_addr, np->n_addrlen);
	427	}
	428	if (np->n_flags & IFF_BROADCAST) {
64b7ee70 MK	429	if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
	430	syslog(LOG_ERR, "ioctl (get broadaddr)");
	431	free((char *)np);
	432	continue;
	433	}
7af17b3e	434	/* we assume addresses are all the same size */
64b7ee70 MK	435	bcopy((char *)&ifreq.ifr_broadaddr,
64b7ee70 MK	436	np->n_addr, np->n_addrlen);
7af17b3e SL	437	}
	438	/* gag, wish we could get rid of Internet dependencies */
	439	sin = (struct sockaddr_in *)np->n_addr;
	440	sin->sin_port = sp->s_port;
	441	np->n_next = neighbors;
	442	neighbors = np;
	443	}
	444	return (1);
	445	}
b1456c48 SL	446
	447	#ifdef DEBUG
	448	sendto(s, buf, cc, flags, to, tolen)
	449	int s;
	450	char *buf;
	451	int cc, flags;
	452	char *to;
	453	int tolen;
	454	{
	455	register struct whod w = (struct whod )buf;
	456	register struct whoent *we;
	457	struct sockaddr_in sin = (struct sockaddr_in )to;
	458	char *interval();
	459
	460	printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port));
	461	printf("hostname %s %s\n", w->wd_hostname,
9bd66dcf	462	interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
b1456c48	463	printf("load %4.2f, %4.2f, %4.2f\n",
9bd66dcf SL	464	ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
9bd66dcf SL	465	ntohl(w->wd_loadav[2]) / 100.0);
b1456c48 SL	466	cc -= WHDRSIZE;
b1456c48 SL	467	for (we = w->wd_we, cc /= sizeof (struct whoent); cc > 0; cc--, we++) {
9bd66dcf	468	time_t t = ntohl(we->we_utmp.out_time);
b1456c48	469	printf("%-8.8s %s:%s %.12s",
9bd66dcf SL	470	we->we_utmp.out_name,
	471	w->wd_hostname, we->we_utmp.out_line,
	472	ctime(&t)+4);
	473	we->we_idle = ntohl(we->we_idle) / 60;
b1456c48 SL	474	if (we->we_idle) {
	475	if (we->we_idle >= 100*60)
	476	we->we_idle = 100*60 - 1;
	477	if (we->we_idle >= 60)
	478	printf(" %2d", we->we_idle / 60);
	479	else
	480	printf(" ");
	481	printf(":%02d", we->we_idle % 60);
	482	}
	483	printf("\n");
	484	}
	485	}
	486
	487	char *
	488	interval(time, updown)
	489	int time;
	490	char *updown;
	491	{
	492	static char resbuf[32];
	493	int days, hours, minutes;
	494
	495	if (time < 0 \|\| time > 330246060) {
	496	(void) sprintf(resbuf, " %s ??:??", updown);
	497	return (resbuf);
	498	}
	499	minutes = (time + 59) / 60; /* round to minutes */
	500	hours = minutes / 60; minutes %= 60;
	501	days = hours / 24; hours %= 24;
	502	if (days)
	503	(void) sprintf(resbuf, "%s %2d+%02d:%02d",
	504	updown, days, hours, minutes);
	505	else
	506	(void) sprintf(resbuf, "%s %2d:%02d",
	507	updown, hours, minutes);
	508	return (resbuf);
	509	}
	510	#endif