1 /*- 2 * Copyright (c) 1994, Garrett Wollman 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #if defined(LIBC_SCCS) && !defined(lint) 27 static char sccsid[] = "@(#)$Id$"; 28 static char rcsid[] = "$Id$"; 29 #endif /* LIBC_SCCS and not lint */ 30 31 #include <sys/param.h> 32 #include <sys/socket.h> 33 #include <netinet/in.h> 34 #include <arpa/inet.h> 35 #include <netdb.h> 36 #include <stdio.h> 37 #include <ctype.h> 38 #include <errno.h> 39 #include <string.h> 40 41 #ifndef _PATH_NETCONF 42 #define _PATH_NETCONF "/etc/host.conf" 43 #endif 44 45 enum service_type { 46 SERVICE_NONE = 0, 47 SERVICE_BIND, 48 SERVICE_TABLE, 49 SERVICE_NIS }; 50 #define SERVICE_MAX SERVICE_NIS 51 52 static struct { 53 const char *name; 54 enum service_type type; 55 } service_names[] = { 56 { "hosts", SERVICE_TABLE }, 57 { "/etc/hosts", SERVICE_TABLE }, 58 { "hosttable", SERVICE_TABLE }, 59 { "htable", SERVICE_TABLE }, 60 { "bind", SERVICE_BIND }, 61 { "dns", SERVICE_BIND }, 62 { "domain", SERVICE_BIND }, 63 { "yp", SERVICE_NIS }, 64 { "yellowpages", SERVICE_NIS }, 65 { "nis", SERVICE_NIS }, 66 { 0, SERVICE_NONE } 67 }; 68 69 static enum service_type service_order[SERVICE_MAX + 1]; 70 static int service_done = 0; 71 72 static enum service_type 73 get_service_name(const char *name) { 74 int i; 75 for(i = 0; service_names[i].type != SERVICE_NONE; i++) { 76 if(!strcasecmp(name, service_names[i].name)) { 77 return service_names[i].type; 78 } 79 } 80 return SERVICE_NONE; 81 } 82 83 static void 84 init_services() 85 { 86 char *cp, *p, buf[BUFSIZ]; 87 register int cc = 0; 88 FILE *fd; 89 90 if ((fd = (FILE *)fopen(_PATH_NETCONF, "r")) == NULL) { 91 /* make some assumptions */ 92 service_order[0] = SERVICE_TABLE; 93 service_order[1] = SERVICE_NONE; 94 } else { 95 while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) { 96 if(buf[0] == '#') 97 continue; 98 99 p = buf; 100 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') 101 ; 102 if (cp == NULL) 103 continue; 104 do { 105 if (isalpha(cp[0])) { 106 service_order[cc] = get_service_name(cp); 107 if(service_order[cc] != SERVICE_NONE) 108 cc++; 109 } 110 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') 111 ; 112 } while(cp != NULL && cc < SERVICE_MAX); 113 } 114 service_order[cc] = SERVICE_NONE; 115 fclose(fd); 116 } 117 service_done = 1; 118 } 119 120 struct netent * 121 getnetbyname(const char *name) 122 { 123 struct netent *hp = 0; 124 int nserv = 0; 125 126 if (!service_done) 127 init_services(); 128 129 while (!hp) { 130 switch (service_order[nserv]) { 131 case SERVICE_NONE: 132 return NULL; 133 case SERVICE_TABLE: 134 hp = _getnetbyhtname(name); 135 break; 136 case SERVICE_BIND: 137 hp = _getnetbydnsname(name); 138 break; 139 case SERVICE_NIS: 140 hp = _getnetbynisname(name); 141 break; 142 } 143 nserv++; 144 } 145 return hp; 146 } 147 148 struct netent * 149 getnetbyaddr(addr, af) 150 u_long addr; 151 int af; 152 { 153 struct netent *hp = 0; 154 int nserv = 0; 155 156 if (!service_done) 157 init_services(); 158 159 while (!hp) { 160 switch (service_order[nserv]) { 161 case SERVICE_NONE: 162 return 0; 163 case SERVICE_TABLE: 164 hp = _getnetbyhtaddr(addr, af); 165 break; 166 case SERVICE_BIND: 167 hp = _getnetbydnsaddr(addr, af); 168 break; 169 case SERVICE_NIS: 170 hp = _getnetbynisaddr(addr, af); 171 break; 172 } 173 nserv++; 174 } 175 return hp; 176 } 177 178 void 179 setnetent(stayopen) 180 int stayopen; 181 { 182 _setnethtent(stayopen); 183 _setnetdnsent(stayopen); 184 } 185 186 void 187 endnetent() 188 { 189 _endnethtent(); 190 _endnetdnsent(); 191 } 192