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Tidy, be a bit more careful about buffers, and don't use strlen() on utmp.

/*	$OpenBSD: rusers.c,v 1.11 2001/02/17 16:52:23 pjanzen Exp $	*/

/*-
 *  Copyright (c) 1993 John Brezak
 *  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. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `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 AUTHOR 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 rcsid[] = "$OpenBSD: rusers.c,v 1.11 2001/02/17 16:52:23 pjanzen Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netdb.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <arpa/inet.h>
#include <utmp.h>
#include <stdlib.h>

/*
 * For now we only try version 2 of the protocol. The current
 * version is 3 (rusers.h), but only Solaris and NetBSD seem
 * to support it currently.
 */
#include <rpcsvc/rnusers.h>	/* Old version */

#define MAX_INT 0x7fffffff
/* Preferred formatting */
#define HOST_WIDTH 20
#define LINE_WIDTH 8
#define NAME_WIDTH 8

struct timeval timeout = { 25, 0 };
int longopt;
int allopt;

struct host_list {
	struct host_list *next;
	struct in_addr addr;
} *hosts;

extern char *__progname;

int
search_host(struct in_addr addr)
{
	struct host_list *hp;
	
	if (!hosts)
		return(0);

	for (hp = hosts; hp != NULL; hp = hp->next) {
		if (hp->addr.s_addr == addr.s_addr)
			return(1);
	}
	return(0);
}

void
remember_host(struct in_addr addr)
{
	struct host_list *hp;

	if (!(hp = (struct host_list *)malloc(sizeof(struct host_list))))
		err(1, NULL);
	hp->addr.s_addr = addr.s_addr;
	hp->next = hosts;
	hosts = hp;
}

int
rusers_reply(char *replyp, struct sockaddr_in *raddrp)
{
	int x, idle, i;
	char date[32], idle_time[64], remote[UT_HOSTSIZE + 1];
	char local[HOST_WIDTH + LINE_WIDTH + 2];
	char utline[UT_LINESIZE + 1];
	struct hostent *hp;
	utmpidlearr *up = (utmpidlearr *)replyp;
	char *host, *tmp;
	int days, hours, minutes, seconds;
	
	if (search_host(raddrp->sin_addr))
		return(0);

	if (!allopt && !up->uia_cnt)
		return(0);
	
	hp = gethostbyaddr((char *)&raddrp->sin_addr.s_addr,
			   sizeof(struct in_addr), AF_INET);
	if (hp)
		host = hp->h_name;
	else
		host = inet_ntoa(raddrp->sin_addr);
	
	if (!longopt)
		printf("%-*.*s ", HOST_WIDTH, HOST_WIDTH, host);
	
	for (x = 0; x < up->uia_cnt; x++) {
		strlcpy(date,
		    &(ctime((time_t *)&(up->uia_arr[x]->ui_utmp.ut_time))[4]),
		    sizeof(date));
		/* ctime() adds a trailing \n.  Trimming it is only
		 * mandatory if the output formatting changes.
		 */
		if ((tmp = strchr(date, '\n')) != NULL)
			*tmp = '\0';

		idle = up->uia_arr[x]->ui_idle;
		sprintf(idle_time, "   :%02d", idle);
		if (idle == MAX_INT)
			strcpy(idle_time, "??");
		else if (idle == 0)
			strcpy(idle_time, "");
		else {
			seconds = idle;
			days = seconds/(60*60*24);
			seconds %= (60*60*24);
			hours = seconds/(60*60);
			seconds %= (60*60);
			minutes = seconds/60;
			seconds %= 60;
			if (idle > 60)
				sprintf(idle_time, "%2d:%02d",
				    minutes, seconds);
			if (idle >= (60*60))
				sprintf(idle_time, "%2d:%02d:%02d",
				    hours, minutes, seconds);
			if (idle >= (24*60*60))
				sprintf(idle_time, "%d days, %d:%02d:%02d",
				    days, hours, minutes, seconds);
		}

		strncpy(remote, up->uia_arr[x]->ui_utmp.ut_host,
		    sizeof(remote)-1);
		remote[sizeof(remote) - 1] = '\0';
		if (strlen(remote) != 0)
			snprintf(remote, UT_HOSTSIZE + 1, "(%.16s)",
			    up->uia_arr[x]->ui_utmp.ut_host);

		if (longopt) {
			strncpy(local, host, sizeof(local));
			strncpy(utline, up->uia_arr[x]->ui_utmp.ut_line,
			    UT_LINESIZE);
			utline[sizeof(utline) - 1] = '\0';
			i = sizeof(local) - strlen(utline) - 2;
			if (i < 0)
				i = 0;
			local[i] = '\0';
			strcat(local, ":");
			strlcat(local, utline, sizeof(local));

			printf("%-*.*s %-*.*s %-12.12s %8s %.18s\n",
			    NAME_WIDTH, UT_NAMESIZE,
			    up->uia_arr[x]->ui_utmp.ut_name,
			    HOST_WIDTH+LINE_WIDTH+1, HOST_WIDTH+LINE_WIDTH+1,
			    local, date, idle_time, remote);
		} else
			printf("%.*s ", UT_NAMESIZE,
			    up->uia_arr[x]->ui_utmp.ut_name);
	}
	if (!longopt)
		putchar('\n');
	
	remember_host(raddrp->sin_addr);
	return(0);
}

void
onehost(char *host)
{
	utmpidlearr up;
	CLIENT *rusers_clnt;
	struct sockaddr_in addr;
	struct hostent *hp;
	
	hp = gethostbyname(host);
	if (hp == NULL)
		errx(1, "unknown host \"%s\"", host);

	rusers_clnt = clnt_create(host, RUSERSPROG, RUSERSVERS_IDLE, "udp");
	if (rusers_clnt == NULL) {
		clnt_pcreateerror(__progname);
		exit(1);
	}

	bzero((char *)&up, sizeof(up));
	if (clnt_call(rusers_clnt, RUSERSPROC_NAMES, xdr_void, NULL,
	    xdr_utmpidlearr, &up, timeout) != RPC_SUCCESS) {
		clnt_perror(rusers_clnt, __progname);
		exit(1);
	}
	addr.sin_addr.s_addr = *(int *)hp->h_addr;
	rusers_reply((char *)&up, &addr);
}

void
allhosts(void)
{
	utmpidlearr up;
	enum clnt_stat clnt_stat;

	bzero((char *)&up, sizeof(up));
	clnt_stat = clnt_broadcast(RUSERSPROG, RUSERSVERS_IDLE,
	    RUSERSPROC_NAMES, xdr_void, NULL, xdr_utmpidlearr,
	    (char *)&up, rusers_reply);
	if (clnt_stat != RPC_SUCCESS && clnt_stat != RPC_TIMEDOUT)
		errx(1, "%s", clnt_sperrno(clnt_stat));
}

void
usage(void)
{
	fprintf(stderr, "Usage: %s [-la] [hosts ...]\n", __progname);
	exit(1);
}

int
main(int argc, char *argv[])
{
	int ch;
	extern int optind;
	
	while ((ch = getopt(argc, argv, "al")) != -1)
		switch (ch) {
		case 'a':
			allopt++;
			break;
		case 'l':
			longopt++;
			break;
		default:
			usage();
			/*NOTREACHED*/
		}

	setlinebuf(stdout);
	if (argc == optind)
		allhosts();
	else {
		for (; optind < argc; optind++)
			(void) onehost(argv[optind]);
	}
	exit(0);
}