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 1.4 2005/11/13 02:04:47 swildner 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 { 72 int i; 73 for(i = 0; service_names[i].type != SERVICE_NONE; i++) { 74 if(!strcasecmp(name, service_names[i].name)) { 75 return service_names[i].type; 76 } 77 } 78 return SERVICE_NONE; 79 } 80 81 static void 82 init_services(void) 83 { 84 char *cp, *p, buf[BUFSIZ]; 85 int cc = 0; 86 FILE *fd; 87 88 if ((fd = (FILE *)fopen(_PATH_NETCONF, "r")) == NULL) { 89 /* make some assumptions */ 90 service_order[0] = SERVICE_TABLE; 91 service_order[1] = SERVICE_NONE; 92 } else { 93 while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) { 94 if(buf[0] == '#') 95 continue; 96 97 p = buf; 98 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') 99 ; 100 if (cp == NULL) 101 continue; 102 do { 103 if (isalpha((unsigned char)cp[0])) { 104 service_order[cc] = get_service_name(cp); 105 if(service_order[cc] != SERVICE_NONE) 106 cc++; 107 } 108 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0') 109 ; 110 } while(cp != NULL && cc < SERVICE_MAX); 111 } 112 service_order[cc] = SERVICE_NONE; 113 fclose(fd); 114 } 115 service_done = 1; 116 } 117 118 struct netent * 119 getnetbyname(const char *name) 120 { 121 struct netent *hp = 0; 122 int nserv = 0; 123 124 if (!service_done) 125 init_services(); 126 127 while (!hp) { 128 switch (service_order[nserv]) { 129 case SERVICE_NONE: 130 return NULL; 131 case SERVICE_TABLE: 132 hp = _getnetbyhtname(name); 133 break; 134 case SERVICE_BIND: 135 hp = _getnetbydnsname(name); 136 break; 137 case SERVICE_NIS: 138 hp = _getnetbynisname(name); 139 break; 140 } 141 nserv++; 142 } 143 return hp; 144 } 145 146 struct netent * 147 getnetbyaddr(u_long addr, int af) 148 { 149 struct netent *hp = 0; 150 int nserv = 0; 151 152 if (!service_done) 153 init_services(); 154 155 while (!hp) { 156 switch (service_order[nserv]) { 157 case SERVICE_NONE: 158 return 0; 159 case SERVICE_TABLE: 160 hp = _getnetbyhtaddr(addr, af); 161 break; 162 case SERVICE_BIND: 163 hp = _getnetbydnsaddr(addr, af); 164 break; 165 case SERVICE_NIS: 166 hp = _getnetbynisaddr(addr, af); 167 break; 168 } 169 nserv++; 170 } 171 return hp; 172 } 173 174 void 175 setnetent(int stayopen) 176 { 177 _setnethtent(stayopen); 178 _setnetdnsent(stayopen); 179 } 180 181 void 182 endnetent(void) 183 { 184 _endnethtent(); 185 _endnetdnsent(); 186 } 187