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 #endif 34 35 #include <string.h> 36 37 #include "jni.h" 38 39 #ifndef MAXDNAME 40 #define MAXDNAME 1025 41 #endif 42 43 44 /* 45 * Class: sun_net_dns_ResolverConfigurationImpl 46 * Method: localDomain0 47 * Signature: ()Ljava/lang/String; 48 */ 49 JNIEXPORT jstring JNICALL 50 Java_sun_net_dns_ResolverConfigurationImpl_localDomain0(JNIEnv *env, jclass cls) 51 { 52 /* 53 * On Solaris the LOCALDOMAIN environment variable has absolute 54 * priority. 55 */ 56 #ifdef __solaris__ 57 { 58 char *cp = getenv("LOCALDOMAIN"); 59 if (cp != NULL) { 60 jstring s = (*env)->NewStringUTF(env, cp); 61 return s; 62 } 63 } 64 #endif 65 return (jstring)NULL; 66 } 67 68 /* 69 * Class: sun_net_dns_ResolverConfigurationImpl 70 * Method: loadConfig0 71 * Signature: ()Ljava/lang/String; 72 */ 73 JNIEXPORT jstring JNICALL 74 Java_sun_net_dns_ResolverConfigurationImpl_fallbackDomain0(JNIEnv *env, jclass cls) 75 { 76 char buf[MAXDNAME]; 77 78 /* 79 * On Solaris if domain or search directives aren't specified 80 * in /etc/resolv.conf then sysinfo or gethostname is used to 81 * determine the domain name. 82 * 83 * On Linux if domain or search directives aren't specified 84 * then gethostname is used. 85 */ 86 87 #ifdef __solaris__ 88 { 89 int ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf)); 90 91 if ((ret > 0) && (ret<sizeof(buf))) { 92 char *cp; 93 jstring s; 94 95 if (buf[0] == '+') { 96 buf[0] = '.'; 97 } 98 cp = strchr(buf, '.'); 99 if (cp == NULL) { 100 s = (*env)->NewStringUTF(env, buf); 101 } else { 102 s = (*env)->NewStringUTF(env, cp+1); 103 } 104 return s; 105 } 106 } 107 #endif 108 109 if (gethostname(buf, sizeof(buf)) == 0) { 110 char *cp; 111 112 /* gethostname doesn't null terminate if insufficient space */ 113 buf[sizeof(buf)-1] = '\0'; 114 115 cp = strchr(buf, '.'); 116 if (cp != NULL) { 117 jstring s = (*env)->NewStringUTF(env, cp+1); 118 return s; 119 } 120 } 121 122 return (jstring)NULL; 123 }