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
36RCSID("$Id$");
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
80/* update utmp and wtmp - the BSD way */
81
82#if !defined(HAVE_UTMPX_H) || (defined(WTMP_FILE) && !defined(WTMPX_FILE))
83
84void
85prepare_utmp (struct utmp *utmp, char *tty,
86	      const char *username, const char *hostname)
87{
88    char *ttyx = clean_ttyname (tty);
89
90    memset(utmp, 0, sizeof(*utmp));
91    utmp->ut_time = time(NULL);
92    strncpy(utmp->ut_line, ttyx, sizeof(utmp->ut_line));
93    strncpy(utmp->ut_name, username, sizeof(utmp->ut_name));
94
95# ifdef HAVE_STRUCT_UTMP_UT_USER
96    strncpy(utmp->ut_user, username, sizeof(utmp->ut_user));
97# endif
98
99# ifdef HAVE_STRUCT_UTMP_UT_ADDR
100    if (hostname[0]) {
101        struct hostent *he;
102	if ((he = gethostbyname(hostname)))
103	    memcpy(&utmp->ut_addr, he->h_addr_list[0],
104		   sizeof(utmp->ut_addr));
105    }
106# endif
107
108# ifdef HAVE_STRUCT_UTMP_UT_HOST
109    shrink_hostname (hostname, utmp->ut_host, sizeof(utmp->ut_host));
110# endif
111
112# ifdef HAVE_STRUCT_UTMP_UT_TYPE
113    utmp->ut_type = USER_PROCESS;
114# endif
115
116# ifdef HAVE_STRUCT_UTMP_UT_PID
117    utmp->ut_pid = getpid();
118# endif
119
120# ifdef HAVE_STRUCT_UTMP_UT_ID
121    strncpy(utmp->ut_id, make_id(ttyx), sizeof(utmp->ut_id));
122# endif
123}
124#endif
125
126#ifdef HAVE_UTMPX_H
127void utmp_login(char *tty, const char *username, const char *hostname)
128{
129    return;
130}
131#else
132
133void utmp_login(char *tty, const char *username, const char *hostname)
134{
135    struct utmp utmp;
136    int fd;
137
138    prepare_utmp (&utmp, tty, username, hostname);
139
140#ifdef HAVE_SETUTENT
141    utmpname(_PATH_UTMP);
142    setutent();
143    pututline(&utmp);
144    endutent();
145#else
146
147#ifdef HAVE_TTYSLOT
148    {
149      int ttyno;
150      ttyno = ttyslot();
151      if (ttyno > 0 && (fd = open(_PATH_UTMP, O_WRONLY, 0)) >= 0) {
152	lseek(fd, (long)(ttyno * sizeof(struct utmp)), SEEK_SET);
153	write(fd, &utmp, sizeof(struct utmp));
154	close(fd);
155      }
156    }
157#endif /* HAVE_TTYSLOT */
158#endif /* HAVE_SETUTENT */
159
160    if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
161	write(fd, &utmp, sizeof(struct utmp));
162	close(fd);
163    }
164}
165
166#endif /* !HAVE_UTMPX_H */
167