xref: /src/usr.bin/rusers/rusers.c

/*-
 * 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. 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 rcsid[] = "$Id: rusers.c,v 1.5 1993/11/10 04:19:03 deraadt Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <strings.h>
#include <rpc/rpc.h>
#include <arpa/inet.h>
#include <rpcsvc/rnusers.h>

#define MAX_INT 0x7fffffff
#define HOST_WIDTH 20
#define LINE_WIDTH 8
char *argv0;

int longopt;
int allopt;

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

int
search_host(addr)
	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(addr)
	struct in_addr addr;
{
	struct host_list *hp;

	if (!(hp = (struct host_list *)malloc(sizeof(struct host_list)))) {
		fprintf(stderr, "%s: no memory.\n", argv0);
		exit(1);
	}
	hp->addr.s_addr = addr.s_addr;
	hp->next = hosts;
	hosts = hp;
}

rusers_reply(replyp, raddrp)
	char *replyp;
	struct sockaddr_in *raddrp;
{
	int x, idle;
	char date[32], idle_time[64], remote[64];
	struct hostent *hp;
	utmpidlearr *up = (utmpidlearr *)replyp;
	char *host;
	int days, hours, minutes, seconds;

	if (search_host(raddrp->sin_addr))
		return(0);

	if (!allopt && !up->utmpidlearr_len)
		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->utmpidlearr_len; x++) {
		strncpy(date,
			&(ctime((time_t *)&(up->utmpidlearr_val[x].ui_utmp.ut_time))[4]),
			sizeof(date)-1);

		idle = up->utmpidlearr_val[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->utmpidlearr_val[x].ui_utmp.ut_host,
		    sizeof(remote)-1);
		if (strlen(remote) != 0)
			sprintf(remote, "(%.16s)",
			    up->utmpidlearr_val[x].ui_utmp.ut_host);

		if (longopt)
			printf("%-8.8s %-*.*s:%-*.*s %-12.12s %8s %.18s\n",
			    up->utmpidlearr_val[x].ui_utmp.ut_name,
			    HOST_WIDTH, HOST_WIDTH, host,
			    LINE_WIDTH, LINE_WIDTH,
			    up->utmpidlearr_val[x].ui_utmp.ut_line,
			    date,
			    idle_time,
			    remote);
		else
			printf("%s ",
			    up->utmpidlearr_val[x].ui_utmp.ut_name);
	}
	if (!longopt)
		putchar('\n');

	remember_host(raddrp->sin_addr);
	return(0);
}

onehost(host)
	char *host;
{
	utmpidlearr up;
	CLIENT *rusers_clnt;
	struct sockaddr_in addr;
	struct hostent *hp;

	hp = gethostbyname(host);
	if (hp == NULL) {
		fprintf(stderr, "%s: unknown host \"%s\"\n",
			argv0, host);
		exit(1);
	}

	rusers_clnt = clnt_create(host, RUSERSPROG, RUSERSVERS_IDLE, "udp");
	if (rusers_clnt == NULL) {
		clnt_pcreateerror(argv0);
		exit(1);
	}

	bzero((char *)&up, sizeof(up));
	if (clnt_call(rusers_clnt, RUSERSPROC_NAMES, xdr_void, NULL,
	    xdr_utmpidlearr, &up, NULL) != RPC_SUCCESS) {
		clnt_perror(rusers_clnt, argv0);
		exit(1);
	}
	addr.sin_addr.s_addr = *(int *)hp->h_addr;
	rusers_reply((char *)&up, &addr);
}

allhosts()
{
	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,
	    &up, rusers_reply);
	if (clnt_stat != RPC_SUCCESS && clnt_stat != RPC_TIMEDOUT) {
		fprintf(stderr, "%s: %s\n", argv0, clnt_sperrno(clnt_stat));
		exit(1);
	}
}

usage()
{
	fprintf(stderr, "Usage: %s [-la] [hosts ...]\n", argv0);
	exit(1);
}

main(argc, argv)
	int argc;
	char *argv[];
{
	int ch;
	extern int optind;

	if (!(argv0 = rindex(argv[0], '/')))
		argv0 = argv[0];
	else
		argv0++;


	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);
}