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

#ifndef lint
static char sccsid[] = "@(#)rwhod.c	4.12 (Berkeley) 83/06/01";
#endif

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

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(), *sprintf(), *malloc();
long	lseek();
int	getkmem();
struct	in_addr inet_makeaddr();

main()
{
	struct sockaddr_in from;
	char path[64];
	int addr;
	struct hostent *hp;

	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
	(void) chdir("/dev");
	(void) signal(SIGHUP, getkmem);
	if (getuid()) {
		fprintf(stderr, "rwhod: not super user\n");
		exit(1);
	}
	/*
	 * Establish host name as returned by system.
	 */
	if (gethostname(myname, sizeof (myname) - 1) < 0) {
		perror("gethostname");
		exit(1);
	}
	strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
	utmpf = open("/etc/utmp", 0);
	if (utmpf < 0) {
		(void) close(creat("/etc/utmp", 0644));
		utmpf = open("/etc/utmp", 0);
	}
	if (utmpf < 0) {
		perror("rwhod: /etc/utmp");
		exit(1);
	}
	getkmem();
	if ((s = socket(AF_INET, SOCK_DGRAM, 0, 0)) < 0) {
		perror("rwhod: socket");
		exit(1);
	}
	hp = gethostbyname(myname);
	if (hp == NULL) {
		fprintf(stderr, "%s: don't know my own name\n", myname);
		exit(1);
	}
	sin.sin_family = hp->h_addrtype;
	sin.sin_port = sp->s_port;
	if (bind(s, &sin, sizeof (sin), 0) < 0) {
		perror("rwhod: bind");
		exit(1);
	}
	if (!configure(s))
		exit(1);
	sigset(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)
				perror("rwhod: recv");
			continue;
		}
		if (from.sin_port != sp->s_port) {
			fprintf(stderr, "rwhod: %d: bad from port\n",
				ntohs(from.sin_port));
			continue;
		}
#ifdef notdef
		if (gethostbyname(wd.wd_hostname) == 0) {
			fprintf(stderr, "rwhod: %s: unknown host\n",
				wd.wd_hostname);
			continue;
		}
#endif
		if (wd.wd_vers != WHODVERSION)
			continue;
		if (wd.wd_type != WHODTYPE_STATUS)
			continue;
		if (!verify(wd.wd_hostname)) {
			fprintf(stderr, "rwhod: malformed host name from %x\n",
				from.sin_addr);
			continue;
		}
		(void) sprintf(path, "%s/whod.%s", RWHODIR, wd.wd_hostname);
		whod = creat(path, 0666);
		if (whod < 0) {
			fprintf(stderr, "rwhod: ");
			perror(path);
			continue;
		}
#if vax || pdp11
		{
			int i, n = (cc - WHDRSIZE)/sizeof(struct utmp);
			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.ut_time =
				    ntohl(we->we_utmp.ut_time);
				we++;
			}
		}
#endif
		(void) time(&wd.wd_recvtime);
		(void) write(whod, (char *)&wd, 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))
			return (0);
		name++, size++;
	}
	return (size > 0);
}

int	utmptime;
int	utmpent;
struct	utmp utmp[100];
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) {
		(void) lseek(utmpf, (long)0, 0);
		cc = read(utmpf, (char *)utmp, sizeof (utmp));
		if (cc < 0) {
			perror("/etc/utmp");
			return;
		}
		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;
	}
	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, 0);
	(void) read(kmemf, (char *)avenrun, sizeof (avenrun));
	for (i = 0; i < 3; i++)
		mywd.wd_loadav[i] = htonl(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);
	(void) alarm(60);
}

getkmem()
{
	struct nlist *nlp;

	signal(SIGHUP, getkmem);
	if (kmemf >= 0)
		(void) close(kmemf);
loop:
	for (nlp = &nl[sizeof (nl) / sizeof (nl[0])]; --nlp >= nl; ) {
		nlp->n_value = 0;
		nlp->n_type = 0;
	}
	nlist("/vmunix", nl);
	if (nl[0].n_value == 0) {
		fprintf(stderr, "/vmunix namelist botch\n");
		sleep(300);
		goto loop;
	}
	kmemf = open("/dev/kmem", 0);
	if (kmemf < 0) {
		perror("/dev/kmem");
		sleep(300);
		goto loop;
	}
	(void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, 0);
	(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;
	int n;
	struct sockaddr_in *sin;
	register struct neighbor *np;

	ifc.ifc_len = sizeof (buf);
	ifc.ifc_buf = buf;
	if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
		perror("rwhod: 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) {
			perror("rwhod: ioctl (get interface flags)");
			free((char *)np);
			continue;
		}
		if ((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) {
				perror("rwhod: 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) {
			/* we assume addresses are all the same size */
			sin = (struct sockaddr_in *)np->n_addr;
			sin->sin_addr =
			  inet_makeaddr(inet_netof(sin->sin_addr), INADDR_ANY);
		}
		/* 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(w->wd_sendtime - w->wd_boottime, "  up"));
	printf("load %4.2f, %4.2f, %4.2f\n",
	    w->wd_loadav[0] / 100.0, w->wd_loadav[1] / 100.0,
	    w->wd_loadav[2] / 100.0);
	cc -= WHDRSIZE;
	for (we = w->wd_we, cc /= sizeof (struct whoent); cc > 0; cc--, we++) {
		printf("%-8.8s %s:%s %.12s",
			 we->we_utmp.out_name,
			 w->wd_hostname, we->we_utmp.out_line,
			ctime((time_t *)&we->we_utmp.out_time)+4);
		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
52b4fb0c	1	#ifndef lint
19bc19e0	2	static char sccsid[] = "@(#)rwhod.c 4.12 (Berkeley) 83/06/01";
52b4fb0c BJ	3	#endif
52b4fb0c BJ	4
52b4fb0c	5	#include <sys/types.h>
52b4fb0c	6	#include <sys/socket.h>
52b4fb0c	7	#include <sys/stat.h>
52b4fb0c	8	#include <sys/ioctl.h>
de3b21e8	9
7af17b3e	10	#include <net/if.h>
de3b21e8 SL	11	#include <netinet/in.h>
	12
	13	#include <nlist.h>
	14	#include <stdio.h>
	15	#include <signal.h>
	16	#include <errno.h>
	17	#include <utmp.h>
a0f59ac1 SL	18	#include <ctype.h>
a0f59ac1 SL	19	#include <netdb.h>
7af17b3e	20	#include <rwhod.h>
de3b21e8	21
a0f59ac1	22	struct sockaddr_in sin = { AF_INET };
52b4fb0c BJ	23
	24	extern errno;
	25
7af17b3e	26	char myname[32];
52b4fb0c BJ	27
	28	struct nlist nl[] = {
	29	#define NL_AVENRUN 0
	30	{ "_avenrun" },
de3b21e8 SL	31	#define NL_BOOTTIME 1
de3b21e8 SL	32	{ "_boottime" },
52b4fb0c BJ	33	0
	34	};
	35
7af17b3e SL	36	/*
	37	* We communicate with each neighbor in
	38	* a list constructed at the time we're
	39	* started up. Neighbors are currently
	40	* directly connected via a hardware interface.
	41	*/
	42	struct neighbor {
	43	struct neighbor *n_next;
	44	char n_name; / interface name */
	45	char n_addr; / who to send to */
	46	int n_addrlen; /* size of address */
	47	int n_flags; /* should forward?, interface flags */
	48	};
	49
	50	struct neighbor *neighbors;
52b4fb0c	51	struct whod mywd;
7af17b3e	52	struct servent *sp;
52b4fb0c BJ	53	int s, utmpf, kmemf = -1;
52b4fb0c BJ	54
7af17b3e SL	55	#define WHDRSIZE (sizeof (mywd) - sizeof (mywd.wd_we))
7af17b3e SL	56	#define RWHODIR "/usr/spool/rwho"
fea387f0	57
52b4fb0c	58	int onalrm();
7af17b3e	59	char strcpy(), sprintf(), *malloc();
52b4fb0c BJ	60	long lseek();
52b4fb0c BJ	61	int getkmem();
7af17b3e	62	struct in_addr inet_makeaddr();
52b4fb0c BJ	63
	64	main()
	65	{
	66	struct sockaddr_in from;
	67	char path[64];
	68	int addr;
7af17b3e	69	struct hostent *hp;
52b4fb0c	70
a0f59ac1 SL	71	sp = getservbyname("who", "udp");
	72	if (sp == 0) {
	73	fprintf(stderr, "rwhod: udp/who: unknown service\n");
	74	exit(1);
	75	}
52b4fb0c BJ	76	#ifndef DEBUG
	77	if (fork())
	78	exit(0);
	79	{ int s;
	80	for (s = 0; s < 10; s++)
	81	(void) close(s);
	82	(void) open("/", 0);
	83	(void) dup2(0, 1);
	84	(void) dup2(0, 2);
	85	s = open("/dev/tty", 2);
	86	if (s >= 0) {
	87	ioctl(s, TIOCNOTTY, 0);
	88	(void) close(s);
	89	}
	90	}
	91	#endif
	92	(void) chdir("/dev");
	93	(void) signal(SIGHUP, getkmem);
	94	if (getuid()) {
a0f59ac1	95	fprintf(stderr, "rwhod: not super user\n");
52b4fb0c BJ	96	exit(1);
52b4fb0c BJ	97	}
7af17b3e SL	98	/*
	99	* Establish host name as returned by system.
	100	*/
	101	if (gethostname(myname, sizeof (myname) - 1) < 0) {
	102	perror("gethostname");
52b4fb0c BJ	103	exit(1);
52b4fb0c BJ	104	}
7af17b3e	105	strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
52b4fb0c BJ	106	utmpf = open("/etc/utmp", 0);
	107	if (utmpf < 0) {
	108	(void) close(creat("/etc/utmp", 0644));
	109	utmpf = open("/etc/utmp", 0);
	110	}
	111	if (utmpf < 0) {
a0f59ac1	112	perror("rwhod: /etc/utmp");
52b4fb0c BJ	113	exit(1);
	114	}
	115	getkmem();
85b11450	116	if ((s = socket(AF_INET, SOCK_DGRAM, 0, 0)) < 0) {
a0f59ac1	117	perror("rwhod: socket");
de3b21e8 SL	118	exit(1);
de3b21e8 SL	119	}
7af17b3e SL	120	hp = gethostbyname(myname);
	121	if (hp == NULL) {
	122	fprintf(stderr, "%s: don't know my own name\n", myname);
	123	exit(1);
	124	}
	125	sin.sin_family = hp->h_addrtype;
	126	sin.sin_port = sp->s_port;
de3b21e8 SL	127	if (bind(s, &sin, sizeof (sin), 0) < 0) {
	128	perror("rwhod: bind");
	129	exit(1);
52b4fb0c	130	}
7af17b3e SL	131	if (!configure(s))
7af17b3e SL	132	exit(1);
52b4fb0c BJ	133	sigset(SIGALRM, onalrm);
	134	onalrm();
	135	for (;;) {
	136	struct whod wd;
7af17b3e	137	int cc, whod, len = sizeof (from);
52b4fb0c	138
7af17b3e SL	139	cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
7af17b3e SL	140	&from, &len);
52b4fb0c BJ	141	if (cc <= 0) {
52b4fb0c BJ	142	if (cc < 0 && errno != EINTR)
de3b21e8	143	perror("rwhod: recv");
52b4fb0c BJ	144	continue;
52b4fb0c BJ	145	}
a0f59ac1 SL	146	if (from.sin_port != sp->s_port) {
	147	fprintf(stderr, "rwhod: %d: bad from port\n",
	148	ntohs(from.sin_port));
52b4fb0c BJ	149	continue;
52b4fb0c BJ	150	}
a0f59ac1 SL	151	#ifdef notdef
	152	if (gethostbyname(wd.wd_hostname) == 0) {
	153	fprintf(stderr, "rwhod: %s: unknown host\n",
	154	wd.wd_hostname);
	155	continue;
	156	}
	157	#endif
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 SL	162	if (!verify(wd.wd_hostname)) {
	163	fprintf(stderr, "rwhod: malformed host name from %x\n",
	164	from.sin_addr);
52b4fb0c BJ	165	continue;
52b4fb0c BJ	166	}
a82aa56a	167	(void) sprintf(path, "%s/whod.%s", RWHODIR, wd.wd_hostname);
52b4fb0c BJ	168	whod = creat(path, 0666);
52b4fb0c BJ	169	if (whod < 0) {
a0f59ac1 SL	170	fprintf(stderr, "rwhod: ");
a0f59ac1 SL	171	perror(path);
52b4fb0c BJ	172	continue;
52b4fb0c BJ	173	}
fea387f0 SL	174	#if vax \|\| pdp11
	175	{
	176	int i, n = (cc - WHDRSIZE)/sizeof(struct utmp);
	177	struct whoent *we;
	178
	179	/* undo header byte swapping before writing to file */
	180	wd.wd_sendtime = ntohl(wd.wd_sendtime);
	181	for (i = 0; i < 3; i++)
	182	wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
	183	wd.wd_boottime = ntohl(wd.wd_boottime);
	184	we = wd.wd_we;
	185	for (i = 0; i < n; i++) {
	186	we->we_idle = ntohl(we->we_idle);
19bc19e0 SL	187	we->we_utmp.ut_time =
19bc19e0 SL	188	ntohl(we->we_utmp.ut_time);
fea387f0 SL	189	we++;
	190	}
	191	}
	192	#endif
52b4fb0c BJ	193	(void) time(&wd.wd_recvtime);
	194	(void) write(whod, (char *)&wd, cc);
	195	(void) close(whod);
	196	}
	197	}
	198
a0f59ac1 SL	199	/*
	200	* Check out host name for unprintables
	201	* and other funnies before allowing a file
	202	* to be created. Sorry, but blanks aren't allowed.
	203	*/
	204	verify(name)
	205	register char *name;
	206	{
	207	register int size = 0;
	208
	209	while (*name) {
	210	if (!isascii(name) \|\| !isalnum(name))
	211	return (0);
	212	name++, size++;
	213	}
	214	return (size > 0);
	215	}
	216
52b4fb0c BJ	217	int utmptime;
52b4fb0c BJ	218	int utmpent;
76886f32	219	struct utmp utmp[100];
52b4fb0c BJ	220	int alarmcount;
	221
	222	onalrm()
	223	{
	224	register int i;
	225	struct stat stb;
76886f32	226	register struct whoent we = mywd.wd_we, wlast;
52b4fb0c BJ	227	int cc;
	228	double avenrun[3];
	229	time_t now = time(0);
7af17b3e	230	register struct neighbor *np;
52b4fb0c BJ	231
	232	if (alarmcount % 10 == 0)
	233	getkmem();
	234	alarmcount++;
	235	(void) fstat(utmpf, &stb);
	236	if (stb.st_mtime != utmptime) {
	237	(void) lseek(utmpf, (long)0, 0);
	238	cc = read(utmpf, (char *)utmp, sizeof (utmp));
	239	if (cc < 0) {
	240	perror("/etc/utmp");
	241	return;
	242	}
7af17b3e	243	wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
52b4fb0c BJ	244	utmpent = cc / sizeof (struct utmp);
	245	for (i = 0; i < utmpent; i++)
	246	if (utmp[i].ut_name[0]) {
b1456c48 SL	247	bcopy(utmp[i].ut_line, we->we_utmp.out_line,
	248	sizeof (utmp[i].ut_line));
	249	bcopy(utmp[i].ut_name, we->we_utmp.out_name,
	250	sizeof (utmp[i].ut_name));
b1456c48	251	we->we_utmp.out_time = htonl(utmp[i].ut_time);
76886f32 SL	252	if (we >= wlast)
76886f32 SL	253	break;
52b4fb0c BJ	254	we++;
	255	}
	256	utmpent = we - mywd.wd_we;
	257	}
	258	we = mywd.wd_we;
	259	for (i = 0; i < utmpent; i++) {
b1456c48	260	if (stat(we->we_utmp.out_line, &stb) >= 0)
b1456c48	261	we->we_idle = htonl(now - stb.st_atime);
52b4fb0c BJ	262	we++;
	263	}
	264	(void) lseek(kmemf, (long)nl[NL_AVENRUN].n_value, 0);
	265	(void) read(kmemf, (char *)avenrun, sizeof (avenrun));
	266	for (i = 0; i < 3; i++)
b1456c48	267	mywd.wd_loadav[i] = htonl(avenrun[i] * 100);
b1456c48	268	cc = (char )we - (char )&mywd;
b1456c48	269	mywd.wd_sendtime = htonl(time(0));
7af17b3e SL	270	mywd.wd_vers = WHODVERSION;
	271	mywd.wd_type = WHODTYPE_STATUS;
	272	for (np = neighbors; np != NULL; np = np->n_next)
	273	(void) sendto(s, (char *)&mywd, cc, 0,
	274	np->n_addr, np->n_addrlen);
52b4fb0c BJ	275	(void) alarm(60);
	276	}
	277
	278	getkmem()
	279	{
	280	struct nlist *nlp;
	281
	282	signal(SIGHUP, getkmem);
	283	if (kmemf >= 0)
	284	(void) close(kmemf);
	285	loop:
	286	for (nlp = &nl[sizeof (nl) / sizeof (nl[0])]; --nlp >= nl; ) {
	287	nlp->n_value = 0;
	288	nlp->n_type = 0;
	289	}
	290	nlist("/vmunix", nl);
	291	if (nl[0].n_value == 0) {
	292	fprintf(stderr, "/vmunix namelist botch\n");
	293	sleep(300);
	294	goto loop;
	295	}
	296	kmemf = open("/dev/kmem", 0);
	297	if (kmemf < 0) {
	298	perror("/dev/kmem");
	299	sleep(300);
	300	goto loop;
	301	}
de3b21e8 SL	302	(void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, 0);
de3b21e8 SL	303	(void) read(kmemf, (char *)&mywd.wd_boottime, sizeof (mywd.wd_boottime));
b1456c48	304	mywd.wd_boottime = htonl(mywd.wd_boottime);
52b4fb0c	305	}
7af17b3e SL	306
	307	/*
	308	* Figure out device configuration and select
	309	* networks which deserve status information.
	310	*/
	311	configure(s)
	312	int s;
	313	{
	314	char buf[BUFSIZ];
	315	struct ifconf ifc;
	316	struct ifreq ifreq, *ifr;
	317	int n;
	318	struct sockaddr_in *sin;
	319	register struct neighbor *np;
	320
	321	ifc.ifc_len = sizeof (buf);
	322	ifc.ifc_buf = buf;
	323	if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
	324	perror("rwhod: ioctl (get interface configuration)");
	325	return (0);
	326	}
	327	ifr = ifc.ifc_req;
	328	for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) {
	329	for (np = neighbors; np != NULL; np = np->n_next)
	330	if (np->n_name &&
	331	strcmp(ifr->ifr_name, np->n_name) == 0)
	332	break;
	333	if (np != NULL)
	334	continue;
	335	ifreq = *ifr;
	336	np = (struct neighbor )malloc(sizeof (np));
	337	if (np == NULL)
	338	continue;
	339	np->n_name = malloc(strlen(ifr->ifr_name) + 1);
	340	if (np->n_name == NULL) {
	341	free((char *)np);
	342	continue;
	343	}
	344	strcpy(np->n_name, ifr->ifr_name);
	345	np->n_addrlen = sizeof (ifr->ifr_addr);
	346	np->n_addr = malloc(np->n_addrlen);
	347	if (np->n_addr == NULL) {
	348	free(np->n_name);
	349	free((char *)np);
	350	continue;
	351	}
	352	bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
	353	if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
	354	perror("rwhod: ioctl (get interface flags)");
	355	free((char *)np);
	356	continue;
	357	}
	358	if ((ifreq.ifr_flags & (IFF_BROADCAST\|IFF_POINTOPOINT)) == 0) {
	359	free((char *)np);
	360	continue;
	361	}
	362	np->n_flags = ifreq.ifr_flags;
	363	if (np->n_flags & IFF_POINTOPOINT) {
	364	if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
	365	perror("rwhod: ioctl (get dstaddr)");
	366	free((char *)np);
	367	continue;
	368	}
	369	/* we assume addresses are all the same size */
370	bcopy((char *)&ifreq.ifr_dstaddr,
371	np->n_addr, np->n_addrlen);
372	}
373	if (np->n_flags & IFF_BROADCAST) {
374	/* we assume addresses are all the same size */
375	sin = (struct sockaddr_in *)np->n_addr;
376	sin->sin_addr =
377	inet_makeaddr(inet_netof(sin->sin_addr), INADDR_ANY);
378	}
379	/* gag, wish we could get rid of Internet dependencies */
380	sin = (struct sockaddr_in *)np->n_addr;
381	sin->sin_port = sp->s_port;
382	np->n_next = neighbors;
383	neighbors = np;
384	}
385	return (1);
386	}
b1456c48 SL	387
	388	#ifdef DEBUG
	389	sendto(s, buf, cc, flags, to, tolen)
	390	int s;
	391	char *buf;
	392	int cc, flags;
	393	char *to;
	394	int tolen;
	395	{
	396	register struct whod w = (struct whod )buf;
	397	register struct whoent *we;
	398	struct sockaddr_in sin = (struct sockaddr_in )to;
	399	char *interval();
	400
	401	printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port));
	402	printf("hostname %s %s\n", w->wd_hostname,
	403	interval(w->wd_sendtime - w->wd_boottime, " up"));
	404	printf("load %4.2f, %4.2f, %4.2f\n",
	405	w->wd_loadav[0] / 100.0, w->wd_loadav[1] / 100.0,
	406	w->wd_loadav[2] / 100.0);
	407	cc -= WHDRSIZE;
	408	for (we = w->wd_we, cc /= sizeof (struct whoent); cc > 0; cc--, we++) {
	409	printf("%-8.8s %s:%s %.12s",
	410	we->we_utmp.out_name,
	411	w->wd_hostname, we->we_utmp.out_line,
	412	ctime((time_t *)&we->we_utmp.out_time)+4);
	413	we->we_idle /= 60;
	414	if (we->we_idle) {
	415	if (we->we_idle >= 100*60)
	416	we->we_idle = 100*60 - 1;
	417	if (we->we_idle >= 60)
	418	printf(" %2d", we->we_idle / 60);
	419	else
	420	printf(" ");
	421	printf(":%02d", we->we_idle % 60);
	422	}
	423	printf("\n");
	424	}
	425	}
	426
	427	char *
	428	interval(time, updown)
	429	int time;
	430	char *updown;
	431	{
	432	static char resbuf[32];
	433	int days, hours, minutes;
	434
	435	if (time < 0 \|\| time > 330246060) {
	436	(void) sprintf(resbuf, " %s ??:??", updown);
	437	return (resbuf);
	438	}
	439	minutes = (time + 59) / 60; /* round to minutes */
	440	hours = minutes / 60; minutes %= 60;
	441	days = hours / 24; hours %= 24;
	442	if (days)
	443	(void) sprintf(resbuf, "%s %2d+%02d:%02d",
	444	updown, days, hours, minutes);
	445	else
	446	(void) sprintf(resbuf, "%s %2d:%02d",
	447	updown, hours, minutes);
	448	return (resbuf);
	449	}
	450	#endif