initial import of NetBSD tree

3 files changed, 696 insertions, 0 deletions

diff --git a/usr.sbin/rwhod/Makefile b/usr.sbin/rwhod/Makefile
new file mode 100644
index 00000000000..05aae9ba651
--- /dev/null
+++ b/usr.sbin/rwhod/Makefile
@@ -0,0 +1,9 @@
+#	from: @(#)Makefile	5.3 (Berkeley) 5/11/90
+#	$Id: Makefile,v 1.1 1995/10/18 08:48:07 deraadt Exp $
+
+PROG=	rwhod
+MAN=	rwhod.8
+DPADD=	${LIBKVM}
+LDADD=	-lkvm
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/rwhod/rwhod.8 b/usr.sbin/rwhod/rwhod.8
new file mode 100644
index 00000000000..b14d6f0db1e
--- /dev/null
+++ b/usr.sbin/rwhod/rwhod.8
@@ -0,0 +1,147 @@
+.\" Copyright (c) 1983, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)rwhod.8	8.2 (Berkeley) 12/11/93
+.\"     $Id: rwhod.8,v 1.1 1995/10/18 08:48:07 deraadt Exp $
+.\"
+.Dd December 11, 1993
+.Dt RWHOD 8
+.Os BSD 4.2
+.Sh NAME
+.Nm rwhod
+.Nd system status server
+.Sh SYNOPSIS
+.Nm rwhod
+.Sh DESCRIPTION
+.Nm Rwhod
+is the server which maintains the database used by the
+.Xr rwho 1
+and
+.Xr ruptime 1
+programs.  Its operation is predicated on the ability to
+.Em broadcast
+messages on a network.
+.Pp
+.Nm Rwhod
+operates as both a producer and consumer of status information.
+As a producer of information it periodically
+queries the state of the system and constructs
+status messages which are broadcast on a network.
+As a consumer of information, it listens for other
+.Nm rwhod
+servers' status messages, validating them, then recording
+them in a collection of files located in the directory
+.Pa /var/rwho .
+.Pp
+The server transmits and receives messages at the port indicated
+in the ``rwho'' service specification; see 
+.Xr services 5 .
+The messages sent and received, are of the form:
+.Bd -literal -offset indent
+struct	outmp {
+	char	out_line[8];		/* tty name */
+	char	out_name[8];		/* user id */
+	long	out_time;		/* time on */
+};
+
+struct	whod {
+	char	wd_vers;
+	char	wd_type;
+	char	wd_fill[2];
+	int	wd_sendtime;
+	int	wd_recvtime;
+	char	wd_hostname[32];
+	int	wd_loadav[3];
+	int	wd_boottime;
+	struct	whoent {
+		struct	outmp we_utmp;
+		int	we_idle;
+	} wd_we[1024 / sizeof (struct whoent)];
+};
+.Ed
+.Pp
+All fields are converted to network byte order prior to
+transmission.  The load averages are as calculated by the
+.Xr w 1
+program, and represent load averages over the 5, 10, and 15 minute 
+intervals prior to a server's transmission; they are multiplied by 100
+for representation in an integer.  The host name
+included is that returned by the
+.Xr gethostname 2
+system call, with any trailing domain name omitted.
+The array at the end of the message contains information about
+the users logged in to the sending machine.  This information 
+includes the contents of the 
+.Xr utmp 5
+entry for each non-idle terminal line and a value indicating the
+time in seconds since a character was last received on the terminal line.
+.Pp
+Messages received by the
+.Xr rwho
+server are discarded unless they originated at an
+.Xr rwho
+server's port.  In addition, if the host's name, as specified
+in the message, contains any unprintable
+.Tn ASCII
+characters, the
+message is discarded.  Valid messages received by
+.Nm rwhod
+are placed in files named
+.Pa whod.hostname
+in the directory
+.Pa /var/rwho .
+These files contain only the most recent message, in the
+format described above.
+.Pp
+Status messages are generated approximately once every
+3 minutes.
+.Nm Rwhod
+performs an
+.Xr nlist 3
+on
+.Pa /netbsd
+every 30 minutes to guard against
+the possibility that this file is not the system
+image currently operating.
+.Sh SEE ALSO
+.Xr rwho 1 ,
+.Xr ruptime 1
+.Sh BUGS
+There should be a way to relay status information between networks. 
+Status information should be sent only upon request rather than continuously.
+People often interpret the server dying
+or network communication failures
+as a machine going down.
+.Sh HISTORY
+The
+.Nm
+command appeared in
+.Bx 4.2 .
diff --git a/usr.sbin/rwhod/rwhod.c b/usr.sbin/rwhod/rwhod.c
new file mode 100644
index 00000000000..423f7fc78b0
--- /dev/null
+++ b/usr.sbin/rwhod/rwhod.c
@@ -0,0 +1,540 @@
+/*
+ * Copyright (c) 1983, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1983, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+/*static char sccsid[] = "@(#)rwhod.c	8.1 (Berkeley) 6/6/93";*/
+static char rcsid[] = "$Id: rwhod.c,v 1.1 1995/10/18 08:48:07 deraadt Exp $";
+#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/sysctl.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/route.h>
+#include <netinet/in.h>
+#include <protocols/rwhod.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <paths.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <utmp.h>
+
+/*
+ * Alarm interval. Don't forget to change the down time check in ruptime
+ * if this is changed.
+ */
+#define AL_INTERVAL (3 * 60)
+
+char	myname[MAXHOSTNAMELEN];
+
+/*
+ * 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 */
+	struct	sockaddr *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;
+
+#define	WHDRSIZE	(sizeof(mywd) - sizeof(mywd.wd_we))
+
+int	 configure __P((int));
+void	 getboottime __P((int));
+void	 onalrm __P((int));
+void	 quit __P((char *));
+void	 rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *));
+int	 verify __P((char *));
+#ifdef DEBUG
+char	*interval __P((int, char *));
+void	 Sendto __P((int, char *, int, int, char *, int));
+#define	 sendto Sendto
+#endif
+
+int
+main(argc, argv)
+	int argc;
+	char argv[];
+{
+	struct sockaddr_in from;
+	struct stat st;
+	char path[64];
+	int on = 1;
+	char *cp;
+	struct sockaddr_in sin;
+
+	if (getuid()) {
+		fprintf(stderr, "rwhod: not super user\n");
+		exit(1);
+	}
+	sp = getservbyname("who", "udp");
+	if (sp == NULL) {
+		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, getboottime);
+	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);
+	}
+	getboottime(0);
+	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);
+	}
+	memset(&sin, 0, sizeof(sin));
+	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(0);
+	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.
+ */
+int
+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(signo)
+	int signo;
+{
+	register struct neighbor *np;
+	register struct whoent *we = mywd.wd_we, *wlast;
+	register int i;
+	struct stat stb;
+	double avenrun[3];
+	time_t now;
+	int cc;
+
+	now = time(NULL);
+	if (alarmcount % 10 == 0)
+		getboottime(0);
+	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, (off_t)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]) {
+				memcpy(we->we_utmp.out_line, utmp[i].ut_line,
+				   sizeof(utmp[i].ut_line));
+				memcpy(we->we_utmp.out_name, utmp[i].ut_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);
+}
+
+void
+getboottime(signo)
+	int signo;
+{
+	int mib[2];
+	size_t size;
+	struct timeval tm;
+
+	mib[0] = CTL_KERN;
+	mib[1] = KERN_BOOTTIME;
+	size = sizeof(tm);
+	if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) {
+		syslog(LOG_ERR, "cannot get boottime: %m");
+		exit(1);
+	}
+	mywd.wd_boottime = htonl(tm.tv_sec);
+}
+
+void
+quit(msg)
+	char *msg;
+{
+	syslog(LOG_ERR, msg);
+	exit(1);
+}
+
+#define ROUNDUP(a) \
+	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+
+void
+rt_xaddrs(cp, cplim, rtinfo)
+	register caddr_t cp, cplim;
+	register struct rt_addrinfo *rtinfo;
+{
+	register struct sockaddr *sa;
+	register int i;
+
+	memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
+	for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
+		if ((rtinfo->rti_addrs & (1 << i)) == 0)
+			continue;
+		rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
+		ADVANCE(cp, sa);
+	}
+}
+
+/*
+ * Figure out device configuration and select
+ * networks which deserve status information.
+ */
+int
+configure(s)
+	int s;
+{
+	register struct neighbor *np;
+	register struct if_msghdr *ifm;
+	register struct ifa_msghdr *ifam;
+	struct sockaddr_dl *sdl;
+	size_t needed;
+	int mib[6], flags = 0, len;
+	char *buf, *lim, *next;
+	struct rt_addrinfo info;
+
+	mib[0] = CTL_NET;
+	mib[1] = PF_ROUTE;
+	mib[2] = 0;
+	mib[3] = AF_INET;
+	mib[4] = NET_RT_IFLIST;
+	mib[5] = 0;
+	if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
+		quit("route-sysctl-estimate");
+	if ((buf = malloc(needed)) == NULL)
+		quit("malloc");
+	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
+		quit("actual retrieval of interface table");
+	lim = buf + needed;
+
+	sdl = NULL;		/* XXX just to keep gcc -Wall happy */
+	for (next = buf; next < lim; next += ifm->ifm_msglen) {
+		ifm = (struct if_msghdr *)next;
+		if (ifm->ifm_type == RTM_IFINFO) {
+			sdl = (struct sockaddr_dl *)(ifm + 1);
+			flags = ifm->ifm_flags;
+			continue;
+		}
+		if ((flags & IFF_UP) == 0 ||
+		    (flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0)
+			continue;
+		if (ifm->ifm_type != RTM_NEWADDR)
+			quit("out of sync parsing NET_RT_IFLIST");
+		ifam = (struct ifa_msghdr *)ifm;
+		info.rti_addrs = ifam->ifam_addrs;
+		rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam,
+			&info);
+		/* gag, wish we could get rid of Internet dependencies */
+#define dstaddr	info.rti_info[RTAX_BRD]
+#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr
+#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port
+		if (dstaddr == 0 || dstaddr->sa_family != AF_INET)
+			continue;
+		PORT_SA(dstaddr) = sp->s_port;
+		for (np = neighbors; np != NULL; np = np->n_next)
+			if (memcmp(sdl->sdl_data, np->n_name,
+				   sdl->sdl_nlen) == 0 &&
+			    IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr))
+				break;
+		if (np != NULL)
+			continue;
+		len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1;
+		np = (struct neighbor *)malloc(len);
+		if (np == NULL)
+			quit("malloc of neighbor structure");
+		memset(np, 0, len);
+		np->n_flags = flags;
+		np->n_addr = (struct sockaddr *)(np + 1);
+		np->n_addrlen = dstaddr->sa_len;
+		np->n_name = np->n_addrlen + (char *)np->n_addr;
+		np->n_next = neighbors;
+		neighbors = np;
+		memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen);
+		memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen);
+	}
+	free(buf);
+	return (1);
+}
+
+#ifdef DEBUG
+void
+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;
+
+	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