libexec/ftpd/logutmp.c

   1 /*      $NetBSD: logutmp.c,v 1.12 2011/09/16 16:13:17 plunky Exp $      */
   2
   3 /*
   4  * Portions Copyright (c) 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Portions Copyright (c) 1996, Jason Downs.  All rights reserved.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  * 1. Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  * 2. Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in the
  42  *    documentation and/or other materials provided with the distribution.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
  45  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  46  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  47  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
  48  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  49  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  50  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  51  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #include <sys/cdefs.h>
  58 #ifndef lint
  59 __RCSID("$NetBSD: logutmp.c,v 1.12 2011/09/16 16:13:17 plunky Exp $");
  60 #endif /* not lint */
  61
  62 #include <sys/types.h>
  63 #include <sys/param.h>
  64
  65 #include <fcntl.h>
  66 #include <stdio.h>
  67 #include <stdlib.h>
  68 #include <string.h>
  69 #include <ttyent.h>
  70 #include <unistd.h>
  71 #include <utmp.h>
  72 #ifdef SUPPORT_UTMPX
  73 #include <utmpx.h>
  74 #endif
  75 #include <util.h>
  76
  77 #include "extern.h"
  78
  79 #ifdef SUPPORT_UTMP
  80 typedef struct utmp UTMP;
  81
  82 static int fd = -1;
  83 static int topslot = -1;
  84
  85 /*
  86  * Special versions of login()/logout() which hold the utmp file open,
  87  * for use with ftpd.
  88  */
  89
  90 void
  91 ftpd_login(const struct utmp *ut)
  92 {
  93         UTMP ubuf;
  94
  95         /*
  96          * First, loop through /etc/ttys, if needed, to initialize the
  97          * top of the tty slots, since ftpd has no tty.
  98          */
  99         if (topslot < 0) {
 100                 topslot = 0;
 101                 while (getttyent() != NULL)
 102                         topslot++;
 103         }
 104         if ((topslot < 0) || ((fd < 0)
 105             && (fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) < 0))
 106                 return;
 107
 108         /*
 109          * Now find a slot that's not in use...
 110          */
 111         (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET);
 112
 113         while (1) {
 114                 if (read(fd, &ubuf, sizeof(UTMP)) == sizeof(UTMP)) {
 115                         if (!ubuf.ut_name[0]) {
 116                                 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
 117                                 break;
 118                         }
 119                         topslot++;
 120                 } else {
 121                         (void)lseek(fd, (off_t)(topslot * sizeof(UTMP)),
 122                             SEEK_SET);
 123                         break;
 124                 }
 125         }
 126
 127         (void)write(fd, ut, sizeof(UTMP));
 128 }
 129
 130 int
 131 ftpd_logout(const char *line)
 132 {
 133         UTMP ut;
 134         int rval;
 135
 136         rval = 0;
 137         if (fd < 0)
 138                 return(rval);
 139
 140         (void)lseek(fd, 0, SEEK_SET);
 141
 142         while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) {
 143                 if (!ut.ut_name[0]
 144                     || strncmp(ut.ut_line, line, UT_LINESIZE))
 145                         continue;
 146                 memset(ut.ut_name, 0, UT_NAMESIZE);
 147                 memset(ut.ut_host, 0, UT_HOSTSIZE);
 148                 (void)time(&ut.ut_time);
 149                 (void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
 150                 (void)write(fd, &ut, sizeof(UTMP));
 151                 rval = 1;
 152         }
 153         return(rval);
 154 }
 155 #endif /* SUPPORT_UTMP */
 156
 157 #ifdef SUPPORT_UTMPX
 158 /*
 159  * special version of loginx which updates utmpx only.
 160  */
 161 void
 162 ftpd_loginx(const struct utmpx *ut)
 163 {
 164         (void)pututxline(ut);
 165 }
 166
 167 int
 168 ftpd_logoutx(const char *line, int status, int mode)
 169 {
 170         return logoutx(line, status, mode);
 171 }
 172 #endif