1 /* 2 * Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <unistd.h> 29 #include <errno.h> 30 31 #ifdef __solaris__ 32 #include <sys/systeminfo.h> 33 #include <strings.h> 34 #endif 35 36 #if defined(__linux__) || defined(_ALLBSD_SOURCE) 37 #include <string.h> 38 #endif 39 40 #include "jni.h" 41 42 #ifndef MAXDNAME 43 #define MAXDNAME 1025 44 #endif 45 46 47 /* 48 * Class: sun_net_dns_ResolverConfgurationImpl 49 * Method: localDomain0 50 * Signature: ()Ljava/lang/String; 51 */ 52 JNIEXPORT jstring JNICALL 53 Java_sun_net_dns_ResolverConfigurationImpl_localDomain0(JNIEnv *env, jclass cls) 54 { 55 /* 56 * On Solaris the LOCALDOMAIN environment variable has absolute 57 * priority. 58 */ 59 #ifdef __solaris__ 60 { 61 char *cp = getenv("LOCALDOMAIN"); 62 if (cp != NULL) { 63 jstring s = (*env)->NewStringUTF(env, cp); 64 return s; 65 } 66 } 67 #endif 68 return (jstring)NULL; 69 } 70 71 /* 72 * Class: sun_net_dns_ResolverConfgurationImpl 73 * Method: loadConfig0 74 * Signature: ()Ljava/lang/String; 75 */ 76 JNIEXPORT jstring JNICALL 77 Java_sun_net_dns_ResolverConfigurationImpl_fallbackDomain0(JNIEnv *env, jclass cls) 78 { 79 char buf[MAXDNAME]; 80 81 /* 82 * On Solaris if domain or search directives aren't specified 83 * in /etc/resolv.conf then sysinfo or gethostname is used to 84 * determine the domain name. 85 * 86 * On Linux if domain or search directives aren't specified 87 * then gethostname is used. 88 */ 89 90 #ifdef __solaris__ 91 { 92 int ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf)); 93 94 if ((ret > 0) && (ret<sizeof(buf))) { 95 char *cp; 96 jstring s; 97 98 if (buf[0] == '+') { 99 buf[0] = '.'; 100 } 101 cp = strchr(buf, '.'); 102 if (cp == NULL) { 103 s = (*env)->NewStringUTF(env, buf); 104 } else { 105 s = (*env)->NewStringUTF(env, cp+1); 106 } 107 return s; 108 } 109 } 110 #endif 111 112 if (gethostname(buf, sizeof(buf)) == 0) { 113 char *cp; 114 115 /* gethostname doesn't null terminate if insufficient space */ 116 buf[sizeof(buf)-1] = '\0'; 117 118 cp = strchr(buf, '.'); 119 if (cp != NULL) { 120 jstring s = (*env)->NewStringUTF(env, cp+1); 121 return s; 122 } 123 } 124 125 return (jstring)NULL; 126 }