HardenedBSD/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 1.1.1.1 1994/08/28 15:06:02 csgr 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 15
char *argv0;

int longopt;
int allopt;

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

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

rusers_reply(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);

        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, "%d:%02d",
                                        minutes, seconds);
                        if (idle >= (60*60))
                                sprintf(idle_time, "%d:%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  %6s %.18s\n",
                               up->utmpidlearr_val[x].ui_utmp.ut_name,
                               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(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(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);
}