crypto/dist/heimdal/appl/login/utmp_login.c

   1 /*
   2  * Copyright (c) 1995 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "login_locl.h"
  35
  36 __RCSID("$Heimdal: utmp_login.c 9661 2001-02-08 16:08:47Z assar $"
  37         "$NetBSD$");
  38
  39 /* try to put something useful from hostname into dst, dst_sz:
  40  * full name, first component or address */
  41
  42 void
  43 shrink_hostname (const char *hostname,
  44                  char *dst, size_t dst_sz)
  45 {
  46     char local_hostname[MaxHostNameLen];
  47     char *ld, *hd;
  48     int ret;
  49     struct addrinfo *ai;
  50
  51     if (strlen(hostname) < dst_sz) {
  52         strlcpy (dst, hostname, dst_sz);
  53         return;
  54     }
  55     gethostname (local_hostname, sizeof(local_hostname));
  56     hd = strchr (hostname, '.');
  57     ld = strchr (local_hostname, '.');
  58     if (hd != NULL && ld != NULL && strcmp(hd, ld) == 0
  59         && hd - hostname < dst_sz) {
  60         strlcpy (dst, hostname, dst_sz);
  61         dst[hd - hostname] = '\0';
  62         return;
  63     }
  64
  65     ret = getaddrinfo (hostname, NULL, NULL, &ai);
  66     if (ret) {
  67         strncpy (dst, hostname, dst_sz);
  68         return;
  69     }
  70     ret = getnameinfo (ai->ai_addr, ai->ai_addrlen,
  71                        dst, dst_sz,
  72                        NULL, 0,
  73                        NI_NUMERICHOST);
  74     freeaddrinfo (ai);
  75     if (ret) {
  76         strncpy (dst, hostname, dst_sz);
  77         return;
  78     }
  79 }
  80
  81 void
  82 prepare_utmp (struct utmp *utmp, char *tty,
  83               const char *username, const char *hostname)
  84 {
  85     char *ttyx = clean_ttyname (tty);
  86
  87     memset(utmp, 0, sizeof(*utmp));
  88     utmp->ut_time = time(NULL);
  89     strncpy(utmp->ut_line, ttyx, sizeof(utmp->ut_line));
  90     strncpy(utmp->ut_name, username, sizeof(utmp->ut_name));
  91
  92 # ifdef HAVE_STRUCT_UTMP_UT_USER
  93     strncpy(utmp->ut_user, username, sizeof(utmp->ut_user));
  94 # endif
  95
  96 # ifdef HAVE_STRUCT_UTMP_UT_ADDR
  97     if (hostname[0]) {
  98         struct hostent *he;
  99         if ((he = gethostbyname(hostname)))
 100             memcpy(&utmp->ut_addr, he->h_addr_list[0],
 101                    sizeof(utmp->ut_addr));
 102     }
 103 # endif
 104
 105 # ifdef HAVE_STRUCT_UTMP_UT_HOST
 106     shrink_hostname (hostname, utmp->ut_host, sizeof(utmp->ut_host));
 107 # endif
 108
 109 # ifdef HAVE_STRUCT_UTMP_UT_TYPE
 110     utmp->ut_type = USER_PROCESS;
 111 # endif
 112
 113 # ifdef HAVE_STRUCT_UTMP_UT_PID
 114     utmp->ut_pid = getpid();
 115 # endif
 116
 117 # ifdef HAVE_STRUCT_UTMP_UT_ID
 118     strncpy(utmp->ut_id, make_id(ttyx), sizeof(utmp->ut_id));
 119 # endif
 120 }
 121
 122 #ifdef HAVE_UTMPX_H
 123 void utmp_login(char *tty, const char *username, const char *hostname)
 124 {
 125     return;
 126 }
 127 #else
 128
 129 /* update utmp and wtmp - the BSD way */
 130
 131 void utmp_login(char *tty, const char *username, const char *hostname)
 132 {
 133     struct utmp utmp;
 134     int fd;
 135
 136     prepare_utmp (&utmp, tty, username, hostname);
 137
 138 #ifdef HAVE_SETUTENT
 139     utmpname(_PATH_UTMP);
 140     setutent();
 141     pututline(&utmp);
 142     endutent();
 143 #else
 144
 145 #ifdef HAVE_TTYSLOT
 146     {
 147       int ttyno;
 148       ttyno = ttyslot();
 149       if (ttyno > 0 && (fd = open(_PATH_UTMP, O_WRONLY, 0)) >= 0) {
 150         lseek(fd, (long)(ttyno * sizeof(struct utmp)), SEEK_SET);
 151         write(fd, &utmp, sizeof(struct utmp));
 152         close(fd);
 153       }
 154     }
 155 #endif /* HAVE_TTYSLOT */
 156 #endif /* HAVE_SETUTENT */
 157
 158     if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
 159         write(fd, &utmp, sizeof(struct utmp));
 160         close(fd);
 161     }
 162 }
 163 #endif /* !HAVE_UTMPX_H */