426 lines
10 KiB
C
426 lines
10 KiB
C
/* $OpenBSD: rusers_proc.c,v 1.27 2019/06/28 13:32:53 deraadt Exp $ */
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/*-
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* Copyright (c) 1993 John Brezak
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <paths.h>
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#include <utmp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <limits.h>
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#include <string.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/rusers.h> /* New version */
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#include <rpcsvc/rnusers.h> /* Old version */
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extern int utmp_fd;
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typedef char ut_line_t[UT_LINESIZE+1];
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typedef char ut_name_t[UT_NAMESIZE+1];
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typedef char ut_host_t[UT_HOSTSIZE+1];
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struct rusers_utmp utmps[MAXUSERS];
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struct utmpidle *utmp_idlep[MAXUSERS];
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struct utmpidle utmp_idle[MAXUSERS];
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struct ru_utmp *ru_utmpp[MAXUSERS];
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struct ru_utmp ru_utmp[MAXUSERS];
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ut_line_t line[MAXUSERS];
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ut_name_t name[MAXUSERS];
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ut_host_t host[MAXUSERS];
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int *rusers_num_svc(void *, struct svc_req *);
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struct utmpidlearr *rusersproc_names_2_svc(void *, struct svc_req *);
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struct utmpidlearr *rusersproc_allnames_2_svc(void *, struct svc_req *);
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struct utmparr *rusersproc_names_1_svc(void *, struct svc_req *);
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struct utmparr *rusersproc_allnames_1_svc(void *, struct svc_req *);
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void rusers_service(struct svc_req *, SVCXPRT *);
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extern int from_inetd;
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FILE *ufp;
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static long
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getidle(char *tty, int len)
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{
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char devname[PATH_MAX];
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struct stat st;
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long idle;
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time_t now;
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snprintf(devname, sizeof devname, "%s/%.*s", _PATH_DEV,
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len, tty);
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if (stat(devname, &st) == -1) {
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#ifdef DEBUG
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printf("%s: %m\n", devname);
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#endif
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return (0);
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}
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time(&now);
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#ifdef DEBUG
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printf("%s: now=%lld atime=%lld\n", devname, (long long)now,
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(long long)st.st_atime);
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#endif
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idle = now - st.st_atime;
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idle = (idle + 30) / 60; /* secs->mins */
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if (idle < 0)
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idle = 0;
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return (idle);
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}
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int *
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rusers_num_svc(void *arg, struct svc_req *rqstp)
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{
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static int num_users = 0;
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struct utmp usr;
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int fd;
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fd = dup(utmp_fd);
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if (fd == -1) {
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syslog(LOG_ERR, "%m");
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return (0);
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}
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lseek(fd, 0, SEEK_SET);
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ufp = fdopen(fd, "r");
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if (!ufp) {
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close(fd);
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syslog(LOG_ERR, "%m");
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return (0);
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}
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/* only entries with both name and line fields */
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while (fread(&usr, sizeof(usr), 1, ufp) == 1)
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if (*usr.ut_name && *usr.ut_line)
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num_users++;
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fclose(ufp);
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return (&num_users);
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}
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static utmp_array *
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do_names_3(int all)
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{
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static utmp_array ut;
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struct utmp usr;
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int fd, nusers = 0;
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bzero(&ut, sizeof(ut));
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ut.utmp_array_val = &utmps[0];
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fd = dup(utmp_fd);
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if (fd == -1) {
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syslog(LOG_ERR, "%m");
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return (0);
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}
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lseek(fd, 0, SEEK_SET);
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ufp = fdopen(fd, "r");
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if (!ufp) {
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close(fd);
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syslog(LOG_ERR, "%m");
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return (NULL);
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}
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/* only entries with both name and line fields */
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while (fread(&usr, sizeof(usr), 1, ufp) == 1 &&
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nusers < MAXUSERS)
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if (*usr.ut_name && *usr.ut_line) {
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utmps[nusers].ut_type = RUSERS_USER_PROCESS;
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utmps[nusers].ut_time = usr.ut_time;
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utmps[nusers].ut_idle = getidle(usr.ut_line,
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sizeof usr.ut_line);
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utmps[nusers].ut_line = line[nusers];
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memset(line[nusers], 0, sizeof(line[nusers]));
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memcpy(line[nusers], usr.ut_line, UT_LINESIZE);
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line[nusers][UT_LINESIZE] = '\0';
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utmps[nusers].ut_user = name[nusers];
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memset(name[nusers], 0, sizeof(name[nusers]));
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memcpy(name[nusers], usr.ut_name, UT_NAMESIZE);
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name[nusers][UT_NAMESIZE] = '\0';
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utmps[nusers].ut_host = host[nusers];
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memset(host[nusers], 0, sizeof(host[nusers]));
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memcpy(host[nusers], usr.ut_host, UT_HOSTSIZE);
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host[nusers][UT_HOSTSIZE] = '\0';
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nusers++;
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}
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ut.utmp_array_len = nusers;
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fclose(ufp);
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return (&ut);
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}
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utmp_array *
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rusersproc_names_3_svc(void *arg, struct svc_req *rqstp)
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{
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return (do_names_3(0));
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}
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utmp_array *
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rusersproc_allnames_3_svc(void *arg, struct svc_req *rqstp)
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{
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return (do_names_3(1));
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}
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static struct utmpidlearr *
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do_names_2(int all)
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{
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static struct utmpidlearr ut;
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struct utmp usr;
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int fd, nusers = 0;
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bzero(&ut, sizeof(ut));
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ut.uia_arr = utmp_idlep;
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ut.uia_cnt = 0;
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fd = dup(utmp_fd);
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if (fd == -1) {
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syslog(LOG_ERR, "%m");
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return (0);
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}
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lseek(fd, 0, SEEK_SET);
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ufp = fdopen(fd, "r");
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if (!ufp) {
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close(fd);
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syslog(LOG_ERR, "%m");
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return (NULL);
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}
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/* only entries with both name and line fields */
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while (fread(&usr, sizeof(usr), 1, ufp) == 1 &&
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nusers < MAXUSERS)
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if (*usr.ut_name && *usr.ut_line) {
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utmp_idlep[nusers] = &utmp_idle[nusers];
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utmp_idle[nusers].ui_utmp.ut_time = usr.ut_time;
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utmp_idle[nusers].ui_idle = getidle(usr.ut_line,
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sizeof usr.ut_line);
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utmp_idle[nusers].ui_utmp.ut_line = line[nusers];
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memset(line[nusers], 0, sizeof(line[nusers]));
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memcpy(line[nusers], usr.ut_line, UT_LINESIZE);
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line[nusers][UT_LINESIZE] = '\0';
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utmp_idle[nusers].ui_utmp.ut_name = name[nusers];
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memset(name[nusers], 0, sizeof(name[nusers]));
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memcpy(name[nusers], usr.ut_name, UT_NAMESIZE);
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name[nusers][UT_NAMESIZE] = '\0';
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utmp_idle[nusers].ui_utmp.ut_host = host[nusers];
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memset(host[nusers], 0, sizeof(host[nusers]));
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memcpy(host[nusers], usr.ut_host, UT_HOSTSIZE);
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host[nusers][UT_HOSTSIZE] = '\0';
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nusers++;
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}
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ut.uia_cnt = nusers;
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fclose(ufp);
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return (&ut);
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}
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struct utmpidlearr *
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rusersproc_names_2_svc(void *arg, struct svc_req *rqstp)
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{
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return (do_names_2(0));
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}
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struct utmpidlearr *
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rusersproc_allnames_2_svc(void *arg, struct svc_req *rqstp)
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{
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return (do_names_2(1));
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}
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static struct utmparr *
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do_names_1(int all)
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{
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static struct utmparr ut;
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struct utmp usr;
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int fd, nusers = 0;
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bzero(&ut, sizeof(ut));
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ut.uta_arr = ru_utmpp;
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ut.uta_cnt = 0;
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fd = dup(utmp_fd);
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if (fd == -1) {
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syslog(LOG_ERR, "%m");
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return (0);
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}
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lseek(fd, 0, SEEK_SET);
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ufp = fdopen(fd, "r");
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if (!ufp) {
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close(fd);
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syslog(LOG_ERR, "%m");
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return (NULL);
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}
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/* only entries with both name and line fields */
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while (fread(&usr, sizeof(usr), 1, ufp) == 1 &&
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nusers < MAXUSERS)
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if (*usr.ut_name && *usr.ut_line) {
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ru_utmpp[nusers] = &ru_utmp[nusers];
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ru_utmp[nusers].ut_time = usr.ut_time;
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ru_utmp[nusers].ut_line = line[nusers];
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memcpy(line[nusers], usr.ut_line, UT_LINESIZE);
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line[nusers][UT_LINESIZE] = '\0';
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ru_utmp[nusers].ut_name = name[nusers];
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memcpy(name[nusers], usr.ut_name, UT_NAMESIZE);
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name[nusers][UT_NAMESIZE] = '\0';
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ru_utmp[nusers].ut_host = host[nusers];
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memcpy(host[nusers], usr.ut_host, UT_HOSTSIZE);
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host[nusers][UT_HOSTSIZE] = '\0';
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nusers++;
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}
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ut.uta_cnt = nusers;
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fclose(ufp);
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return (&ut);
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}
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struct utmparr *
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rusersproc_names_1_svc(void *arg, struct svc_req *rqstp)
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{
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return (do_names_1(0));
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}
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struct utmparr *
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rusersproc_allnames_1_svc(void *arg, struct svc_req *rqstp)
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{
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return (do_names_1(1));
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}
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void
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rusers_service(struct svc_req *rqstp, SVCXPRT *transp)
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{
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char *(*local)(void *, struct svc_req *);
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xdrproc_t xdr_argument, xdr_result;
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union {
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int fill;
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} argument;
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char *result;
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switch (rqstp->rq_proc) {
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case NULLPROC:
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(void)svc_sendreply(transp, xdr_void, (char *)NULL);
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goto leave;
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case RUSERSPROC_NUM:
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xdr_argument = (xdrproc_t)xdr_void;
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xdr_result = (xdrproc_t)xdr_int;
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switch (rqstp->rq_vers) {
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case RUSERSVERS_3:
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case RUSERSVERS_IDLE:
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case RUSERSVERS_ORIG:
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local = (char *(*)(void *, struct svc_req *))
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rusers_num_svc;
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break;
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default:
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svcerr_progvers(transp, RUSERSVERS_IDLE, RUSERSVERS_3);
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goto leave;
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/*NOTREACHED*/
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}
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break;
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case RUSERSPROC_NAMES:
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xdr_argument = (xdrproc_t)xdr_void;
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xdr_result = (xdrproc_t)xdr_utmp_array;
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switch (rqstp->rq_vers) {
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case RUSERSVERS_3:
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local = (char *(*)(void *, struct svc_req *))
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rusersproc_names_3_svc;
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break;
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case RUSERSVERS_IDLE:
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xdr_result = (xdrproc_t)xdr_utmpidlearr;
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local = (char *(*)(void *, struct svc_req *))
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rusersproc_names_2_svc;
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break;
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case RUSERSVERS_ORIG:
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xdr_result = (xdrproc_t)xdr_utmpidlearr;
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local = (char *(*)(void *, struct svc_req *))
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rusersproc_names_1_svc;
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break;
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default:
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svcerr_progvers(transp, RUSERSVERS_IDLE, RUSERSVERS_3);
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goto leave;
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/*NOTREACHED*/
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}
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break;
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case RUSERSPROC_ALLNAMES:
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xdr_argument = (xdrproc_t)xdr_void;
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xdr_result = (xdrproc_t)xdr_utmp_array;
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switch (rqstp->rq_vers) {
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case RUSERSVERS_3:
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local = (char *(*)(void *, struct svc_req *))
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rusersproc_allnames_3_svc;
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break;
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case RUSERSVERS_IDLE:
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xdr_result = (xdrproc_t)xdr_utmpidlearr;
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local = (char *(*)(void *, struct svc_req *))
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rusersproc_allnames_2_svc;
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break;
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case RUSERSVERS_ORIG:
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xdr_result = (xdrproc_t)xdr_utmpidlearr;
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local = (char *(*)(void *, struct svc_req *))
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rusersproc_allnames_1_svc;
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break;
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default:
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svcerr_progvers(transp, RUSERSVERS_IDLE, RUSERSVERS_3);
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goto leave;
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/*NOTREACHED*/
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}
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break;
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default:
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svcerr_noproc(transp);
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goto leave;
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}
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bzero((char *)&argument, sizeof(argument));
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if (!svc_getargs(transp, xdr_argument, (caddr_t)&argument)) {
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svcerr_decode(transp);
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goto leave;
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}
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result = (*local)(&argument, rqstp);
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if (result != NULL && !svc_sendreply(transp, xdr_result, result))
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svcerr_systemerr(transp);
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if (!svc_freeargs(transp, xdr_argument, (caddr_t)&argument)) {
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syslog(LOG_ERR, "unable to free arguments");
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exit(1);
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}
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leave:
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if (from_inetd)
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exit(0);
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}
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