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("$Id$");
37
38 /* try to put something useful from hostname into dst, dst_sz:
39 * full name, first component or address */
40
41 void
shrink_hostname(const char * hostname,char * dst,size_t dst_sz)42 shrink_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
84 void
prepare_utmp(struct utmp * utmp,char * tty,const char * username,const char * hostname)85 prepare_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
utmp_login(char * tty,const char * username,const char * hostname)127 void utmp_login(char *tty, const char *username, const char *hostname)
128 {
129 return;
130 }
131 #else
132
utmp_login(char * tty,const char * username,const char * hostname)133 void 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