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

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

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

#ifndef lint
static char sccsid[] = "@(#)rwhod.c	5.10 (Berkeley) %G%";
#endif not lint

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

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

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

extern	errno;

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))
#define	RWHODIR		"/usr/spool/rwho"

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;
	extern char *index();

	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("/dev/tty", 2);
	  if (s >= 0) {
		ioctl(s, TIOCNOTTY, 0);
		(void) close(s);
	  }
	}
#endif
	if (chdir(RWHODIR) < 0) {
		perror(RWHODIR);
		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("/etc/utmp", O_RDONLY);
	if (utmpf < 0) {
		(void) close(creat("/etc/utmp", 0644));
		utmpf = open("/etc/utmp", O_RDONLY);
	}
	if (utmpf < 0) {
		syslog(LOG_ERR, "/etc/utmp: %m");
		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 int i;
	struct stat stb;
	register struct whoent *we = mywd.wd_we, *wlast;
	int cc;
	double avenrun[3];
	time_t now = time(0);
	register struct neighbor *np;

	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) {
			perror("/etc/utmp");
			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("/dev")) {
		syslog(LOG_ERR, "chdir(/dev): %m");
		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(RWHODIR)) {
		syslog(LOG_ERR, "chdir(%s): %m", RWHODIR);
		exit(1);
	}
done:
	(void) alarm(AL_INTERVAL);
}

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

	if (stat("/vmunix", &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("/vmunix", nl)) {
		syslog(LOG_WARNING, "/vmunix namelist botch");
		sleep(300);
		goto loop;
	}
	kmemf = open("/dev/kmem", O_RDONLY);
	if (kmemf < 0) {
		syslog(LOG_ERR, "/dev/kmem: %m");
		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 DF	1	/*
	2	* Copyright (c) 1983 Regents of the University of California.
	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*/
	6
	7	#ifndef lint
	8	char copyright[] =
	9	"@(#) Copyright (c) 1983 Regents of the University of California.\n\
	10	All rights reserved.\n";
	11	#endif not lint
	12
52b4fb0c	13	#ifndef lint
9bd38ba8	14	static char sccsid[] = "@(#)rwhod.c 5.10 (Berkeley) %G%";
3b86b0f6	15	#endif not lint
52b4fb0c	16
52b4fb0c	17	#include <sys/types.h>
52b4fb0c	18	#include <sys/socket.h>
52b4fb0c	19	#include <sys/stat.h>
52b4fb0c	20	#include <sys/ioctl.h>
9bd66dcf	21	#include <sys/file.h>
de3b21e8	22
7af17b3e	23	#include <net/if.h>
de3b21e8 SL	24	#include <netinet/in.h>
	25
	26	#include <nlist.h>
	27	#include <stdio.h>
	28	#include <signal.h>
	29	#include <errno.h>
	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>
de3b21e8	35
83361bb3 RC	36	/*
	37	* Alarm interval. Don't forget to change the down time check in ruptime
	38	* if this is changed.
	39	*/
00cdc205	40	#define AL_INTERVAL (3 * 60)
83361bb3	41
a0f59ac1	42	struct sockaddr_in sin = { AF_INET };
52b4fb0c BJ	43
	44	extern errno;
	45
7af17b3e	46	char myname[32];
52b4fb0c BJ	47
	48	struct nlist nl[] = {
	49	#define NL_AVENRUN 0
	50	{ "_avenrun" },
de3b21e8 SL	51	#define NL_BOOTTIME 1
de3b21e8 SL	52	{ "_boottime" },
52b4fb0c BJ	53	0
	54	};
	55
7af17b3e SL	56	/*
	57	* We communicate with each neighbor in
	58	* a list constructed at the time we're
	59	* started up. Neighbors are currently
	60	* directly connected via a hardware interface.
	61	*/
	62	struct neighbor {
	63	struct neighbor *n_next;
	64	char n_name; / interface name */
	65	char n_addr; / who to send to */
	66	int n_addrlen; /* size of address */
	67	int n_flags; /* should forward?, interface flags */
	68	};
	69
	70	struct neighbor *neighbors;
52b4fb0c	71	struct whod mywd;
7af17b3e	72	struct servent *sp;
52b4fb0c BJ	73	int s, utmpf, kmemf = -1;
52b4fb0c BJ	74
7af17b3e SL	75	#define WHDRSIZE (sizeof (mywd) - sizeof (mywd.wd_we))
7af17b3e SL	76	#define RWHODIR "/usr/spool/rwho"
fea387f0	77
52b4fb0c	78	int onalrm();
9bd38ba8	79	char strcpy(), malloc();
52b4fb0c BJ	80	long lseek();
52b4fb0c BJ	81	int getkmem();
7af17b3e	82	struct in_addr inet_makeaddr();
52b4fb0c BJ	83
	84	main()
	85	{
	86	struct sockaddr_in from;
0f2d5e68	87	struct stat st;
52b4fb0c	88	char path[64];
221be169	89	int on = 1;
d2444544 JB	90	char *cp;
d2444544 JB	91	extern char *index();
52b4fb0c	92
00cdc205 RC	93	if (getuid()) {
	94	fprintf(stderr, "rwhod: not super user\n");
	95	exit(1);
	96	}
a0f59ac1 SL	97	sp = getservbyname("who", "udp");
	98	if (sp == 0) {
	99	fprintf(stderr, "rwhod: udp/who: unknown service\n");
	100	exit(1);
	101	}
52b4fb0c BJ	102	#ifndef DEBUG
	103	if (fork())
	104	exit(0);
	105	{ int s;
	106	for (s = 0; s < 10; s++)
	107	(void) close(s);
	108	(void) open("/", 0);
	109	(void) dup2(0, 1);
	110	(void) dup2(0, 2);
	111	s = open("/dev/tty", 2);
	112	if (s >= 0) {
	113	ioctl(s, TIOCNOTTY, 0);
	114	(void) close(s);
	115	}
	116	}
	117	#endif
ac82a1ec KM	118	if (chdir(RWHODIR) < 0) {
	119	perror(RWHODIR);
	120	exit(1);
	121	}
52b4fb0c	122	(void) signal(SIGHUP, getkmem);
076ae92c	123	openlog("rwhod", LOG_PID, LOG_DAEMON);
7af17b3e SL	124	/*
	125	* Establish host name as returned by system.
	126	*/
	127	if (gethostname(myname, sizeof (myname) - 1) < 0) {
00cdc205	128	syslog(LOG_ERR, "gethostname: %m");
52b4fb0c BJ	129	exit(1);
52b4fb0c BJ	130	}
d2444544 JB	131	if ((cp = index(myname, '.')) != NULL)
d2444544 JB	132	*cp = '\0';
7af17b3e	133	strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
9bd66dcf	134	utmpf = open("/etc/utmp", O_RDONLY);
52b4fb0c BJ	135	if (utmpf < 0) {
52b4fb0c BJ	136	(void) close(creat("/etc/utmp", 0644));
9bd66dcf	137	utmpf = open("/etc/utmp", O_RDONLY);
52b4fb0c BJ	138	}
52b4fb0c BJ	139	if (utmpf < 0) {
00cdc205	140	syslog(LOG_ERR, "/etc/utmp: %m");
52b4fb0c BJ	141	exit(1);
	142	}
	143	getkmem();
9bd66dcf	144	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
00cdc205	145	syslog(LOG_ERR, "socket: %m");
de3b21e8 SL	146	exit(1);
de3b21e8 SL	147	}
3de1986a	148	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
b0e1e5f3 MK	149	syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
	150	exit(1);
	151	}
7af17b3e	152	sin.sin_port = sp->s_port;
9bd66dcf	153	if (bind(s, &sin, sizeof (sin)) < 0) {
00cdc205	154	syslog(LOG_ERR, "bind: %m");
de3b21e8	155	exit(1);
52b4fb0c	156	}
7af17b3e SL	157	if (!configure(s))
7af17b3e SL	158	exit(1);
8a53982e	159	signal(SIGALRM, onalrm);
52b4fb0c BJ	160	onalrm();
	161	for (;;) {
	162	struct whod wd;
7af17b3e	163	int cc, whod, len = sizeof (from);
52b4fb0c	164
7af17b3e SL	165	cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
7af17b3e SL	166	&from, &len);
52b4fb0c BJ	167	if (cc <= 0) {
52b4fb0c BJ	168	if (cc < 0 && errno != EINTR)
00cdc205	169	syslog(LOG_WARNING, "recv: %m");
52b4fb0c BJ	170	continue;
52b4fb0c BJ	171	}
a0f59ac1	172	if (from.sin_port != sp->s_port) {
00cdc205	173	syslog(LOG_WARNING, "%d: bad from port",
a0f59ac1	174	ntohs(from.sin_port));
52b4fb0c BJ	175	continue;
52b4fb0c BJ	176	}
a0f59ac1 SL	177	#ifdef notdef
a0f59ac1 SL	178	if (gethostbyname(wd.wd_hostname) == 0) {
00cdc205	179	syslog(LOG_WARNING, "%s: unknown host",
a0f59ac1 SL	180	wd.wd_hostname);
	181	continue;
	182	}
	183	#endif
aaddf8a1 SL	184	if (wd.wd_vers != WHODVERSION)
aaddf8a1 SL	185	continue;
7af17b3e SL	186	if (wd.wd_type != WHODTYPE_STATUS)
7af17b3e SL	187	continue;
a0f59ac1	188	if (!verify(wd.wd_hostname)) {
00cdc205	189	syslog(LOG_WARNING, "malformed host name from %x",
a0f59ac1	190	from.sin_addr);
52b4fb0c BJ	191	continue;
52b4fb0c BJ	192	}
ac82a1ec	193	(void) sprintf(path, "whod.%s", wd.wd_hostname);
0f2d5e68 MK	194	/*
	195	* Rather than truncating and growing the file each time,
	196	* use ftruncate if size is less than previous size.
	197	*/
	198	whod = open(path, O_WRONLY \| O_CREAT, 0644);
52b4fb0c	199	if (whod < 0) {
00cdc205	200	syslog(LOG_WARNING, "%s: %m", path);
52b4fb0c BJ	201	continue;
52b4fb0c BJ	202	}
fea387f0 SL	203	#if vax \|\| pdp11
fea387f0 SL	204	{
9bd66dcf	205	int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
fea387f0 SL	206	struct whoent *we;
	207
	208	/* undo header byte swapping before writing to file */
	209	wd.wd_sendtime = ntohl(wd.wd_sendtime);
	210	for (i = 0; i < 3; i++)
	211	wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
	212	wd.wd_boottime = ntohl(wd.wd_boottime);
	213	we = wd.wd_we;
	214	for (i = 0; i < n; i++) {
	215	we->we_idle = ntohl(we->we_idle);
1cccbcb3 SL	216	we->we_utmp.out_time =
1cccbcb3 SL	217	ntohl(we->we_utmp.out_time);
fea387f0 SL	218	we++;
	219	}
	220	}
	221	#endif
52b4fb0c BJ	222	(void) time(&wd.wd_recvtime);
52b4fb0c BJ	223	(void) write(whod, (char *)&wd, cc);
0f2d5e68 MK	224	if (fstat(whod, &st) < 0 \|\| st.st_size > cc)
0f2d5e68 MK	225	ftruncate(whod, cc);
52b4fb0c BJ	226	(void) close(whod);
	227	}
	228	}
	229
a0f59ac1 SL	230	/*
	231	* Check out host name for unprintables
	232	* and other funnies before allowing a file
	233	* to be created. Sorry, but blanks aren't allowed.
	234	*/
	235	verify(name)
	236	register char *name;
	237	{
	238	register int size = 0;
	239
	240	while (*name) {
77650176	241	if (!isascii(name) \|\| !(isalnum(name) \|\| ispunct(*name)))
a0f59ac1 SL	242	return (0);
	243	name++, size++;
	244	}
	245	return (size > 0);
	246	}
	247
52b4fb0c BJ	248	int utmptime;
52b4fb0c BJ	249	int utmpent;
4c9b3acd JB	250	int utmpsize = 0;
4c9b3acd JB	251	struct utmp *utmp;
52b4fb0c BJ	252	int alarmcount;
	253
	254	onalrm()
	255	{
	256	register int i;
	257	struct stat stb;
76886f32	258	register struct whoent we = mywd.wd_we, wlast;
52b4fb0c BJ	259	int cc;
	260	double avenrun[3];
	261	time_t now = time(0);
7af17b3e	262	register struct neighbor *np;
52b4fb0c BJ	263
	264	if (alarmcount % 10 == 0)
	265	getkmem();
	266	alarmcount++;
	267	(void) fstat(utmpf, &stb);
4c9b3acd	268	if ((stb.st_mtime != utmptime) \|\| (stb.st_size > utmpsize)) {
02d31241	269	utmptime = stb.st_mtime;
4c9b3acd JB	270	if (stb.st_size > utmpsize) {
	271	utmpsize = stb.st_size + 10 * sizeof(struct utmp);
	272	if (utmp)
	273	utmp = (struct utmp *)realloc(utmp, utmpsize);
	274	else
	275	utmp = (struct utmp *)malloc(utmpsize);
	276	if (! utmp) {
	277	fprintf(stderr, "rwhod: malloc failed\n");
	278	utmpsize = 0;
	279	goto done;
	280	}
	281	}
9bd66dcf	282	(void) lseek(utmpf, (long)0, L_SET);
4c9b3acd	283	cc = read(utmpf, (char *)utmp, stb.st_size);
52b4fb0c BJ	284	if (cc < 0) {
52b4fb0c BJ	285	perror("/etc/utmp");
08d10f57	286	goto done;
52b4fb0c	287	}
7af17b3e	288	wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
52b4fb0c BJ	289	utmpent = cc / sizeof (struct utmp);
	290	for (i = 0; i < utmpent; i++)
	291	if (utmp[i].ut_name[0]) {
b1456c48 SL	292	bcopy(utmp[i].ut_line, we->we_utmp.out_line,
	293	sizeof (utmp[i].ut_line));
	294	bcopy(utmp[i].ut_name, we->we_utmp.out_name,
	295	sizeof (utmp[i].ut_name));
b1456c48	296	we->we_utmp.out_time = htonl(utmp[i].ut_time);
76886f32 SL	297	if (we >= wlast)
76886f32 SL	298	break;
52b4fb0c BJ	299	we++;
	300	}
	301	utmpent = we - mywd.wd_we;
	302	}
221be169 KM	303
	304	/*
	305	* The test on utmpent looks silly---after all, if no one is
	306	* logged on, why worry about efficiency?---but is useful on
	307	* (e.g.) compute servers.
	308	*/
	309	if (utmpent && chdir("/dev")) {
	310	syslog(LOG_ERR, "chdir(/dev): %m");
	311	exit(1);
	312	}
52b4fb0c BJ	313	we = mywd.wd_we;
52b4fb0c BJ	314	for (i = 0; i < utmpent; i++) {
221be169	315	if (stat(we->we_utmp.out_line, &stb) >= 0)
b1456c48	316	we->we_idle = htonl(now - stb.st_atime);
52b4fb0c BJ	317	we++;
52b4fb0c BJ	318	}
9bd66dcf	319	(void) lseek(kmemf, (long)nl[NL_AVENRUN].n_value, L_SET);
52b4fb0c BJ	320	(void) read(kmemf, (char *)avenrun, sizeof (avenrun));
52b4fb0c BJ	321	for (i = 0; i < 3; i++)
353c1281	322	mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
b1456c48	323	cc = (char )we - (char )&mywd;
b1456c48	324	mywd.wd_sendtime = htonl(time(0));
7af17b3e SL	325	mywd.wd_vers = WHODVERSION;
	326	mywd.wd_type = WHODTYPE_STATUS;
	327	for (np = neighbors; np != NULL; np = np->n_next)
	328	(void) sendto(s, (char *)&mywd, cc, 0,
	329	np->n_addr, np->n_addrlen);
221be169 KM	330	if (utmpent && chdir(RWHODIR)) {
	331	syslog(LOG_ERR, "chdir(%s): %m", RWHODIR);
	332	exit(1);
	333	}
08d10f57	334	done:
83361bb3	335	(void) alarm(AL_INTERVAL);
52b4fb0c BJ	336	}
	337
	338	getkmem()
	339	{
07cac863 SL	340	static ino_t vmunixino;
	341	static time_t vmunixctime;
	342	struct stat sb;
52b4fb0c	343
07cac863 SL	344	if (stat("/vmunix", &sb) < 0) {
	345	if (vmunixctime)
	346	return;
	347	} else {
	348	if (sb.st_ctime == vmunixctime && sb.st_ino == vmunixino)
	349	return;
	350	vmunixctime = sb.st_ctime;
	351	vmunixino= sb.st_ino;
	352	}
52b4fb0c BJ	353	if (kmemf >= 0)
	354	(void) close(kmemf);
	355	loop:
00cdc205 RC	356	if (nlist("/vmunix", nl)) {
00cdc205 RC	357	syslog(LOG_WARNING, "/vmunix namelist botch");
52b4fb0c BJ	358	sleep(300);
	359	goto loop;
	360	}
9bd66dcf	361	kmemf = open("/dev/kmem", O_RDONLY);
52b4fb0c	362	if (kmemf < 0) {
00cdc205 RC	363	syslog(LOG_ERR, "/dev/kmem: %m");
00cdc205 RC	364	exit(1);
52b4fb0c	365	}
9bd66dcf SL	366	(void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, L_SET);
	367	(void) read(kmemf, (char *)&mywd.wd_boottime,
	368	sizeof (mywd.wd_boottime));
b1456c48	369	mywd.wd_boottime = htonl(mywd.wd_boottime);
52b4fb0c	370	}
7af17b3e SL	371
	372	/*
	373	* Figure out device configuration and select
	374	* networks which deserve status information.
	375	*/
	376	configure(s)
	377	int s;
	378	{
	379	char buf[BUFSIZ];
	380	struct ifconf ifc;
	381	struct ifreq ifreq, *ifr;
7af17b3e SL	382	struct sockaddr_in *sin;
7af17b3e SL	383	register struct neighbor *np;
9bd66dcf	384	int n;
7af17b3e SL	385
	386	ifc.ifc_len = sizeof (buf);
	387	ifc.ifc_buf = buf;
	388	if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
00cdc205	389	syslog(LOG_ERR, "ioctl (get interface configuration)");
7af17b3e SL	390	return (0);
	391	}
	392	ifr = ifc.ifc_req;
	393	for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) {
	394	for (np = neighbors; np != NULL; np = np->n_next)
	395	if (np->n_name &&
	396	strcmp(ifr->ifr_name, np->n_name) == 0)
	397	break;
	398	if (np != NULL)
	399	continue;
	400	ifreq = *ifr;
	401	np = (struct neighbor )malloc(sizeof (np));
	402	if (np == NULL)
	403	continue;
	404	np->n_name = malloc(strlen(ifr->ifr_name) + 1);
	405	if (np->n_name == NULL) {
	406	free((char *)np);
	407	continue;
	408	}
	409	strcpy(np->n_name, ifr->ifr_name);
	410	np->n_addrlen = sizeof (ifr->ifr_addr);
	411	np->n_addr = malloc(np->n_addrlen);
	412	if (np->n_addr == NULL) {
	413	free(np->n_name);
	414	free((char *)np);
	415	continue;
	416	}
	417	bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
	418	if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
00cdc205	419	syslog(LOG_ERR, "ioctl (get interface flags)");
7af17b3e SL	420	free((char *)np);
	421	continue;
	422	}
64b7ee70 MK	423	if ((ifreq.ifr_flags & IFF_UP) == 0 \|\|
64b7ee70 MK	424	(ifreq.ifr_flags & (IFF_BROADCAST\|IFF_POINTOPOINT)) == 0) {
7af17b3e SL	425	free((char *)np);
	426	continue;
	427	}
	428	np->n_flags = ifreq.ifr_flags;
	429	if (np->n_flags & IFF_POINTOPOINT) {
	430	if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
00cdc205	431	syslog(LOG_ERR, "ioctl (get dstaddr)");
7af17b3e SL	432	free((char *)np);
	433	continue;
	434	}
	435	/* we assume addresses are all the same size */
	436	bcopy((char *)&ifreq.ifr_dstaddr,
	437	np->n_addr, np->n_addrlen);
	438	}
	439	if (np->n_flags & IFF_BROADCAST) {
64b7ee70 MK	440	if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
	441	syslog(LOG_ERR, "ioctl (get broadaddr)");
	442	free((char *)np);
	443	continue;
	444	}
7af17b3e	445	/* we assume addresses are all the same size */
64b7ee70 MK	446	bcopy((char *)&ifreq.ifr_broadaddr,
64b7ee70 MK	447	np->n_addr, np->n_addrlen);
7af17b3e SL	448	}
	449	/* gag, wish we could get rid of Internet dependencies */
	450	sin = (struct sockaddr_in *)np->n_addr;
	451	sin->sin_port = sp->s_port;
	452	np->n_next = neighbors;
	453	neighbors = np;
	454	}
	455	return (1);
	456	}
b1456c48 SL	457
	458	#ifdef DEBUG
	459	sendto(s, buf, cc, flags, to, tolen)
	460	int s;
	461	char *buf;
	462	int cc, flags;
	463	char *to;
	464	int tolen;
	465	{
	466	register struct whod w = (struct whod )buf;
	467	register struct whoent *we;
	468	struct sockaddr_in sin = (struct sockaddr_in )to;
	469	char *interval();
	470
	471	printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port));
	472	printf("hostname %s %s\n", w->wd_hostname,
9bd66dcf	473	interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
b1456c48	474	printf("load %4.2f, %4.2f, %4.2f\n",
9bd66dcf SL	475	ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
9bd66dcf SL	476	ntohl(w->wd_loadav[2]) / 100.0);
b1456c48 SL	477	cc -= WHDRSIZE;
b1456c48 SL	478	for (we = w->wd_we, cc /= sizeof (struct whoent); cc > 0; cc--, we++) {
9bd66dcf	479	time_t t = ntohl(we->we_utmp.out_time);
b1456c48	480	printf("%-8.8s %s:%s %.12s",
9bd66dcf SL	481	we->we_utmp.out_name,
	482	w->wd_hostname, we->we_utmp.out_line,
	483	ctime(&t)+4);
	484	we->we_idle = ntohl(we->we_idle) / 60;
b1456c48 SL	485	if (we->we_idle) {
	486	if (we->we_idle >= 100*60)
	487	we->we_idle = 100*60 - 1;
	488	if (we->we_idle >= 60)
	489	printf(" %2d", we->we_idle / 60);
	490	else
	491	printf(" ");
	492	printf(":%02d", we->we_idle % 60);
	493	}
	494	printf("\n");
	495	}
	496	}
	497
	498	char *
	499	interval(time, updown)
	500	int time;
	501	char *updown;
	502	{
	503	static char resbuf[32];
	504	int days, hours, minutes;
	505
	506	if (time < 0 \|\| time > 330246060) {
	507	(void) sprintf(resbuf, " %s ??:??", updown);
	508	return (resbuf);
	509	}
	510	minutes = (time + 59) / 60; /* round to minutes */
	511	hours = minutes / 60; minutes %= 60;
	512	days = hours / 24; hours %= 24;
	513	if (days)
	514	(void) sprintf(resbuf, "%s %2d+%02d:%02d",
	515	updown, days, hours, minutes);
	516	else
	517	(void) sprintf(resbuf, "%s %2d:%02d",
	518	updown, hours, minutes);
	519	return (resbuf);
	520	}
	521	#endif