1 /* 2 * Copyright 2008, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "NetUtils" 18 19 #include "jni.h" 20 #include <utils/misc.h> 21 #include <android_runtime/AndroidRuntime.h> 22 #include <utils/Log.h> 23 #include <arpa/inet.h> 24 #include <cutils/properties.h> 25 26 extern "C" { 27 int ifc_enable(const char *ifname); 28 int ifc_disable(const char *ifname); 29 int ifc_reset_connections(const char *ifname, int reset_mask); 30 31 int dhcp_do_request(const char *ifname, 32 const char *ipaddr, 33 const char *gateway, 34 uint32_t *prefixLength, 35 const char *dns1, 36 const char *dns2, 37 const char *server, 38 uint32_t *lease, 39 const char *vendorInfo); 40 41 int dhcp_do_request_renew(const char *ifname, 42 const char *ipaddr, 43 const char *gateway, 44 uint32_t *prefixLength, 45 const char *dns1, 46 const char *dns2, 47 const char *server, 48 uint32_t *lease, 49 const char *vendorInfo); 50 51 int dhcp_stop(const char *ifname); 52 int dhcp_release_lease(const char *ifname); 53 char *dhcp_get_errmsg(); 54 } 55 56 #define NETUTILS_PKG_NAME "android/net/NetworkUtils" 57 58 namespace android { 59 60 /* 61 * The following remembers the jfieldID's of the fields 62 * of the DhcpInfo Java object, so that we don't have 63 * to look them up every time. 64 */ 65 static struct fieldIds { 66 jmethodID constructorId; 67 jfieldID ipaddress; 68 jfieldID prefixLength; 69 jfieldID dns1; 70 jfieldID dns2; 71 jfieldID serverAddress; 72 jfieldID leaseDuration; 73 jfieldID vendorInfo; 74 } dhcpInfoInternalFieldIds; 75 76 static jint android_net_utils_enableInterface(JNIEnv* env, jobject clazz, jstring ifname) 77 { 78 int result; 79 80 const char *nameStr = env->GetStringUTFChars(ifname, NULL); 81 result = ::ifc_enable(nameStr); 82 env->ReleaseStringUTFChars(ifname, nameStr); 83 return (jint)result; 84 } 85 86 static jint android_net_utils_disableInterface(JNIEnv* env, jobject clazz, jstring ifname) 87 { 88 int result; 89 90 const char *nameStr = env->GetStringUTFChars(ifname, NULL); 91 result = ::ifc_disable(nameStr); 92 env->ReleaseStringUTFChars(ifname, nameStr); 93 return (jint)result; 94 } 95 96 static jint android_net_utils_resetConnections(JNIEnv* env, jobject clazz, 97 jstring ifname, jint mask) 98 { 99 int result; 100 101 const char *nameStr = env->GetStringUTFChars(ifname, NULL); 102 103 ALOGD("android_net_utils_resetConnections in env=%p clazz=%p iface=%s mask=0x%x\n", 104 env, clazz, nameStr, mask); 105 106 result = ::ifc_reset_connections(nameStr, mask); 107 env->ReleaseStringUTFChars(ifname, nameStr); 108 return (jint)result; 109 } 110 111 static jboolean android_net_utils_runDhcpCommon(JNIEnv* env, jobject clazz, jstring ifname, 112 jobject info, bool renew) 113 { 114 int result; 115 char ipaddr[PROPERTY_VALUE_MAX]; 116 uint32_t prefixLength; 117 char gateway[PROPERTY_VALUE_MAX]; 118 char dns1[PROPERTY_VALUE_MAX]; 119 char dns2[PROPERTY_VALUE_MAX]; 120 char server[PROPERTY_VALUE_MAX]; 121 uint32_t lease; 122 char vendorInfo[PROPERTY_VALUE_MAX]; 123 124 const char *nameStr = env->GetStringUTFChars(ifname, NULL); 125 if (nameStr == NULL) return (jboolean)false; 126 127 if (renew) { 128 result = ::dhcp_do_request_renew(nameStr, ipaddr, gateway, &prefixLength, 129 dns1, dns2, server, &lease, vendorInfo); 130 } else { 131 result = ::dhcp_do_request(nameStr, ipaddr, gateway, &prefixLength, 132 dns1, dns2, server, &lease, vendorInfo); 133 } 134 135 env->ReleaseStringUTFChars(ifname, nameStr); 136 if (result == 0) { 137 env->SetObjectField(info, dhcpInfoInternalFieldIds.ipaddress, env->NewStringUTF(ipaddr)); 138 139 // set the gateway 140 jclass cls = env->FindClass("java/net/InetAddress"); 141 jmethodID method = env->GetStaticMethodID(cls, "getByName", 142 "(Ljava/lang/String;)Ljava/net/InetAddress;"); 143 jvalue args[1]; 144 args[0].l = env->NewStringUTF(gateway); 145 jobject inetAddressObject = env->CallStaticObjectMethodA(cls, method, args); 146 147 if (!env->ExceptionOccurred()) { 148 cls = env->FindClass("android/net/RouteInfo"); 149 method = env->GetMethodID(cls, "<init>", "(Ljava/net/InetAddress;)V"); 150 args[0].l = inetAddressObject; 151 jobject routeInfoObject = env->NewObjectA(cls, method, args); 152 153 cls = env->FindClass("android/net/DhcpInfoInternal"); 154 method = env->GetMethodID(cls, "addRoute", "(Landroid/net/RouteInfo;)V"); 155 args[0].l = routeInfoObject; 156 env->CallVoidMethodA(info, method, args); 157 } else { 158 // if we have an exception (host not found perhaps), just don't add the route 159 env->ExceptionClear(); 160 } 161 162 env->SetIntField(info, dhcpInfoInternalFieldIds.prefixLength, prefixLength); 163 env->SetObjectField(info, dhcpInfoInternalFieldIds.dns1, env->NewStringUTF(dns1)); 164 env->SetObjectField(info, dhcpInfoInternalFieldIds.dns2, env->NewStringUTF(dns2)); 165 env->SetObjectField(info, dhcpInfoInternalFieldIds.serverAddress, 166 env->NewStringUTF(server)); 167 env->SetIntField(info, dhcpInfoInternalFieldIds.leaseDuration, lease); 168 env->SetObjectField(info, dhcpInfoInternalFieldIds.vendorInfo, env->NewStringUTF(vendorInfo)); 169 } 170 return (jboolean)(result == 0); 171 } 172 173 static jboolean android_net_utils_runDhcp(JNIEnv* env, jobject clazz, jstring ifname, jobject info) 174 { 175 return android_net_utils_runDhcpCommon(env, clazz, ifname, info, false); 176 } 177 178 static jboolean android_net_utils_runDhcpRenew(JNIEnv* env, jobject clazz, jstring ifname, jobject info) 179 { 180 return android_net_utils_runDhcpCommon(env, clazz, ifname, info, true); 181 } 182 183 184 static jboolean android_net_utils_stopDhcp(JNIEnv* env, jobject clazz, jstring ifname) 185 { 186 int result; 187 188 const char *nameStr = env->GetStringUTFChars(ifname, NULL); 189 result = ::dhcp_stop(nameStr); 190 env->ReleaseStringUTFChars(ifname, nameStr); 191 return (jboolean)(result == 0); 192 } 193 194 static jboolean android_net_utils_releaseDhcpLease(JNIEnv* env, jobject clazz, jstring ifname) 195 { 196 int result; 197 198 const char *nameStr = env->GetStringUTFChars(ifname, NULL); 199 result = ::dhcp_release_lease(nameStr); 200 env->ReleaseStringUTFChars(ifname, nameStr); 201 return (jboolean)(result == 0); 202 } 203 204 static jstring android_net_utils_getDhcpError(JNIEnv* env, jobject clazz) 205 { 206 return env->NewStringUTF(::dhcp_get_errmsg()); 207 } 208 209 // ---------------------------------------------------------------------------- 210 211 /* 212 * JNI registration. 213 */ 214 static JNINativeMethod gNetworkUtilMethods[] = { 215 /* name, signature, funcPtr */ 216 217 { "enableInterface", "(Ljava/lang/String;)I", (void *)android_net_utils_enableInterface }, 218 { "disableInterface", "(Ljava/lang/String;)I", (void *)android_net_utils_disableInterface }, 219 { "resetConnections", "(Ljava/lang/String;I)I", (void *)android_net_utils_resetConnections }, 220 { "runDhcp", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z", (void *)android_net_utils_runDhcp }, 221 { "runDhcpRenew", "(Ljava/lang/String;Landroid/net/DhcpInfoInternal;)Z", (void *)android_net_utils_runDhcpRenew }, 222 { "stopDhcp", "(Ljava/lang/String;)Z", (void *)android_net_utils_stopDhcp }, 223 { "releaseDhcpLease", "(Ljava/lang/String;)Z", (void *)android_net_utils_releaseDhcpLease }, 224 { "getDhcpError", "()Ljava/lang/String;", (void*) android_net_utils_getDhcpError }, 225 }; 226 227 int register_android_net_NetworkUtils(JNIEnv* env) 228 { 229 jclass dhcpInfoInternalClass = env->FindClass("android/net/DhcpInfoInternal"); 230 LOG_FATAL_IF(dhcpInfoInternalClass == NULL, "Unable to find class android/net/DhcpInfoInternal"); 231 dhcpInfoInternalFieldIds.constructorId = env->GetMethodID(dhcpInfoInternalClass, "<init>", "()V"); 232 dhcpInfoInternalFieldIds.ipaddress = env->GetFieldID(dhcpInfoInternalClass, "ipAddress", "Ljava/lang/String;"); 233 dhcpInfoInternalFieldIds.prefixLength = env->GetFieldID(dhcpInfoInternalClass, "prefixLength", "I"); 234 dhcpInfoInternalFieldIds.dns1 = env->GetFieldID(dhcpInfoInternalClass, "dns1", "Ljava/lang/String;"); 235 dhcpInfoInternalFieldIds.dns2 = env->GetFieldID(dhcpInfoInternalClass, "dns2", "Ljava/lang/String;"); 236 dhcpInfoInternalFieldIds.serverAddress = env->GetFieldID(dhcpInfoInternalClass, "serverAddress", "Ljava/lang/String;"); 237 dhcpInfoInternalFieldIds.leaseDuration = env->GetFieldID(dhcpInfoInternalClass, "leaseDuration", "I"); 238 dhcpInfoInternalFieldIds.vendorInfo = env->GetFieldID(dhcpInfoInternalClass, "vendorInfo", "Ljava/lang/String;"); 239 240 return AndroidRuntime::registerNativeMethods(env, 241 NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods)); 242 } 243 244 }; // namespace android 245
