1/*
2 * Copyright (c) 1995 - 2001 Kungliga Tekniska H�gskolan
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
36RCSID("$Id: utmp_login.c 9661 2001-02-08 16:08:47Z assar $");
37
38/* try to put something useful from hostname into dst, dst_sz:
39 * full name, first component or address */
40
41void
42shrink_hostname (const char *hostname,
43		 char *dst, size_t dst_sz)
44{
45    char local_hostname[MaxHostNameLen];
46    char *ld, *hd;
47    int ret;
48    struct addrinfo *ai;
49
50    if (strlen(hostname) < dst_sz) {
51	strlcpy (dst, hostname, dst_sz);
52	return;
53    }
54    gethostname (local_hostname, sizeof(local_hostname));
55    hd = strchr (hostname, '.');
56    ld = strchr (local_hostname, '.');
57    if (hd != NULL && ld != NULL && strcmp(hd, ld) == 0
58	&& hd - hostname < dst_sz) {
59	strlcpy (dst, hostname, dst_sz);
60	dst[hd - hostname] = '\0';
61	return;
62    }
63
64    ret = getaddrinfo (hostname, NULL, NULL, &ai);
65    if (ret) {
66	strncpy (dst, hostname, dst_sz);
67	return;
68    }
69    ret = getnameinfo (ai->ai_addr, ai->ai_addrlen,
70		       dst, dst_sz,
71		       NULL, 0,
72		       NI_NUMERICHOST);
73    freeaddrinfo (ai);
74    if (ret) {
75	strncpy (dst, hostname, dst_sz);
76	return;
77    }
78}
79
80void
81prepare_utmp (struct utmp *utmp, char *tty,
82	      const char *username, const char *hostname)
83{
84    char *ttyx = clean_ttyname (tty);
85
86    memset(utmp, 0, sizeof(*utmp));
87    utmp->ut_time = time(NULL);
88    strncpy(utmp->ut_line, ttyx, sizeof(utmp->ut_line));
89    strncpy(utmp->ut_name, username, sizeof(utmp->ut_name));
90
91# ifdef HAVE_STRUCT_UTMP_UT_USER
92    strncpy(utmp->ut_user, username, sizeof(utmp->ut_user));
93# endif
94
95# ifdef HAVE_STRUCT_UTMP_UT_ADDR
96    if (hostname[0]) {
97        struct hostent *he;
98	if ((he = gethostbyname(hostname)))
99	    memcpy(&utmp->ut_addr, he->h_addr_list[0],
100		   sizeof(utmp->ut_addr));
101    }
102# endif
103
104# ifdef HAVE_STRUCT_UTMP_UT_HOST
105    shrink_hostname (hostname, utmp->ut_host, sizeof(utmp->ut_host));
106# endif
107
108# ifdef HAVE_STRUCT_UTMP_UT_TYPE
109    utmp->ut_type = USER_PROCESS;
110# endif
111
112# ifdef HAVE_STRUCT_UTMP_UT_PID
113    utmp->ut_pid = getpid();
114# endif
115
116# ifdef HAVE_STRUCT_UTMP_UT_ID
117    strncpy(utmp->ut_id, make_id(ttyx), sizeof(utmp->ut_id));
118# endif
119}
120
121#ifdef HAVE_UTMPX_H
122void utmp_login(char *tty, const char *username, const char *hostname)
123{
124    return;
125}
126#else
127
128/* update utmp and wtmp - the BSD way */
129
130void utmp_login(char *tty, const char *username, const char *hostname)
131{
132    struct utmp utmp;
133    int fd;
134
135    prepare_utmp (&utmp, tty, username, hostname);
136
137#ifdef HAVE_SETUTENT
138    utmpname(_PATH_UTMP);
139    setutent();
140    pututline(&utmp);
141    endutent();
142#else
143
144#ifdef HAVE_TTYSLOT
145    {
146      int ttyno;
147      ttyno = ttyslot();
148      if (ttyno > 0 && (fd = open(_PATH_UTMP, O_WRONLY, 0)) >= 0) {
149	lseek(fd, (long)(ttyno * sizeof(struct utmp)), SEEK_SET);
150	write(fd, &utmp, sizeof(struct utmp));
151	close(fd);
152      }
153    }
154#endif /* HAVE_TTYSLOT */
155#endif /* HAVE_SETUTENT */
156
157    if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
158	write(fd, &utmp, sizeof(struct utmp));
159	close(fd);
160    }
161}
162#endif /* !HAVE_UTMPX_H */
163