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 * $FreeBSD: src/lib/libc/net/getnetnamadr.c,v 1.12.2.1 2001/03/05 10:47:08 obrien Exp $ 26 * $DragonFly: src/lib/libc/net/getnetnamadr.c,v 1.3 2004/10/25 19:38:01 drhodus Exp $ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/socket.h> 31 #include <netinet/in.h> 32 #include <arpa/inet.h> 33 #include <netdb.h> 34 #include <stdio.h> 35 #include <ctype.h> 36 #include <string.h> 37 38 #ifndef _PATH_NETCONF 39 #define _PATH_NETCONF "/etc/host.conf" 40 #endif 41 42 enum service_type { 43 SERVICE_NONE = 0, 44 SERVICE_BIND, 45 SERVICE_TABLE, 46 SERVICE_NIS }; 47 #define SERVICE_MAX SERVICE_NIS 48 49 static struct { 50 const char *name; 51 enum service_type type; 52 } service_names[] = { 53 { "hosts", SERVICE_TABLE }, 54 { "/etc/hosts", SERVICE_TABLE }, 55 { "hosttable", SERVICE_TABLE }, 56 { "htable", SERVICE_TABLE }, 57 { "bind", SERVICE_BIND }, 58 { "dns", SERVICE_BIND }, 59 { "domain", SERVICE_BIND }, 60 { "yp", SERVICE_NIS }, 61 { "yellowpages", SERVICE_NIS }, 62 { "nis", SERVICE_NIS }, 63 { 0, SERVICE_NONE } 64 }; 65 66 static enum service_type service_order[SERVICE_MAX + 1]; 67 static int service_done = 0; 68 69 static enum service_type 70 get_service_name(const char *name) { 71 int i; 72 for(i = 0; service_names[i].type != SERVICE_NONE; i++) { 73 if(!strcasecmp(name, service_names[i].name)) { 74 return service_names[i].type; 75 } 76 } 77 return SERVICE_NONE; 78 } 79 80 static void 81 init_services() 82 { 83 char *cp, *p, buf[BUFSIZ]; 84 int cc = 0; 85 FILE *fd; 86 87 if ((fd = (FILE *)fopen(_PATH_NETCONF, "r")) == NULL) { 88 /* make some assumptions */ 89 service_order[0] = SERVICE_TABLE; 90 service_order[1] = SERVICE_NONE; 91 } else { 92 while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) { 93 if(buf[0] == '#') 94 continue; 95 96 p = buf; 97 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') 98 ; 99 if (cp == NULL) 100 continue; 101 do { 102 if (isalpha((unsigned char)cp[0])) { 103 service_order[cc] = get_service_name(cp); 104 if(service_order[cc] != SERVICE_NONE) 105 cc++; 106 } 107 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') 108 ; 109 } while(cp != NULL && cc < SERVICE_MAX); 110 } 111 service_order[cc] = SERVICE_NONE; 112 fclose(fd); 113 } 114 service_done = 1; 115 } 116 117 struct netent * 118 getnetbyname(const char *name) 119 { 120 struct netent *hp = 0; 121 int nserv = 0; 122 123 if (!service_done) 124 init_services(); 125 126 while (!hp) { 127 switch (service_order[nserv]) { 128 case SERVICE_NONE: 129 return NULL; 130 case SERVICE_TABLE: 131 hp = _getnetbyhtname(name); 132 break; 133 case SERVICE_BIND: 134 hp = _getnetbydnsname(name); 135 break; 136 case SERVICE_NIS: 137 hp = _getnetbynisname(name); 138 break; 139 } 140 nserv++; 141 } 142 return hp; 143 } 144 145 struct netent * 146 getnetbyaddr(addr, af) 147 u_long addr; 148 int af; 149 { 150 struct netent *hp = 0; 151 int nserv = 0; 152 153 if (!service_done) 154 init_services(); 155 156 while (!hp) { 157 switch (service_order[nserv]) { 158 case SERVICE_NONE: 159 return 0; 160 case SERVICE_TABLE: 161 hp = _getnetbyhtaddr(addr, af); 162 break; 163 case SERVICE_BIND: 164 hp = _getnetbydnsaddr(addr, af); 165 break; 166 case SERVICE_NIS: 167 hp = _getnetbynisaddr(addr, af); 168 break; 169 } 170 nserv++; 171 } 172 return hp; 173 } 174 175 void 176 setnetent(stayopen) 177 int stayopen; 178 { 179 _setnethtent(stayopen); 180 _setnetdnsent(stayopen); 181 } 182 183 void 184 endnetent() 185 { 186 _endnethtent(); 187 _endnetdnsent(); 188 } 189