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 36 RCSID("$Id: utmp_login.c,v 1.18 2001/02/08 16:08:26 assar Exp $"); 37 38 /* try to put something useful from hostname into dst, dst_sz: 39 * full name, first component or address */ 40 41 void 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 void 81 prepare_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 122 void 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 */ 129 130 void 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