| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "InetAddress" |
| |
| #define LOG_DNS 0 |
| |
| #include "JNIHelp.h" |
| #include "utils/Log.h" |
| #include "jni.h" |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <netdb.h> |
| #include <errno.h> |
| |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <sys/socket.h> |
| |
| |
| static jclass byteArrayClass = NULL; |
| |
| static jstring InetAddress_gethostname(JNIEnv* env, jclass) |
| { |
| char name[256]; |
| int r = gethostname(name, 256); |
| if (r == 0) { |
| return env->NewStringUTF(name); |
| } else { |
| return NULL; |
| } |
| } |
| |
| #if LOG_DNS |
| static void logIpString(struct addrinfo* ai, const char* name) |
| { |
| char ipString[INET6_ADDRSTRLEN]; |
| int result = getnameinfo(ai->ai_addr, ai->ai_addrlen, ipString, |
| sizeof(ipString), NULL, 0, NI_NUMERICHOST); |
| if (result == 0) { |
| LOGD("%s: %s (family %d, proto %d)", name, ipString, ai->ai_family, |
| ai->ai_protocol); |
| } else { |
| LOGE("%s: getnameinfo: %s", name, gai_strerror(result)); |
| } |
| } |
| #else |
| static inline void logIpString(struct addrinfo*, const char*) |
| { |
| } |
| #endif |
| |
| static jobjectArray InetAddress_getaddrinfoImpl(JNIEnv* env, const char* name) { |
| struct addrinfo hints, *addressList = NULL, *addrInfo; |
| jobjectArray addressArray = NULL; |
| |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_family = AF_UNSPEC; |
| hints.ai_flags = AI_ADDRCONFIG; |
| /* |
| * If we don't specify a socket type, every address will appear twice, once |
| * for SOCK_STREAM and one for SOCK_DGRAM. Since we do not return the family |
| * anyway, just pick one. |
| */ |
| hints.ai_socktype = SOCK_STREAM; |
| |
| int result = getaddrinfo(name, NULL, &hints, &addressList); |
| if (result == 0 && addressList) { |
| // Count results so we know how to size the output array. |
| int addressCount = 0; |
| for (addrInfo = addressList; addrInfo; addrInfo = addrInfo->ai_next) { |
| if (addrInfo->ai_family == AF_INET || addrInfo->ai_family == AF_INET6) { |
| addressCount++; |
| } |
| } |
| |
| // Prepare output array. |
| addressArray = env->NewObjectArray(addressCount, byteArrayClass, NULL); |
| if (addressArray == NULL) { |
| // Appropriate exception will be thrown. |
| LOGE("getaddrinfo: could not allocate array of size %i", addressCount); |
| freeaddrinfo(addressList); |
| return NULL; |
| } |
| |
| // Examine returned addresses one by one, save them in the output array. |
| int index = 0; |
| for (addrInfo = addressList; addrInfo; addrInfo = addrInfo->ai_next) { |
| struct sockaddr* address = addrInfo->ai_addr; |
| size_t addressLength = 0; |
| void* rawAddress; |
| |
| switch (addrInfo->ai_family) { |
| // Find the raw address length and start pointer. |
| case AF_INET6: |
| addressLength = 16; |
| rawAddress = &((struct sockaddr_in6*) address)->sin6_addr.s6_addr; |
| logIpString(addrInfo, name); |
| break; |
| case AF_INET: |
| addressLength = 4; |
| rawAddress = &((struct sockaddr_in*) address)->sin_addr.s_addr; |
| logIpString(addrInfo, name); |
| break; |
| default: |
| // Unknown address family. Skip this address. |
| LOGE("getaddrinfo: Unknown address family %d", addrInfo->ai_family); |
| continue; |
| } |
| |
| // Convert each IP address into a Java byte array. |
| jbyteArray bytearray = env->NewByteArray(addressLength); |
| if (bytearray == NULL) { |
| // Out of memory error will be thrown on return. |
| LOGE("getaddrinfo: Can't allocate %d-byte array", addressLength); |
| addressArray = NULL; |
| break; |
| } |
| env->SetByteArrayRegion(bytearray, 0, addressLength, (jbyte*) rawAddress); |
| env->SetObjectArrayElement(addressArray, index, bytearray); |
| env->DeleteLocalRef(bytearray); |
| index++; |
| } |
| } else if (result == EAI_SYSTEM && errno == EACCES) { |
| /* No permission to use network */ |
| jniThrowException(env, "java/lang/SecurityException", |
| "Permission denied (maybe missing INTERNET permission)"); |
| } else { |
| jniThrowException(env, "java/net/UnknownHostException", gai_strerror(result)); |
| } |
| |
| if (addressList) { |
| freeaddrinfo(addressList); |
| } |
| |
| return addressArray; |
| } |
| |
| jobjectArray InetAddress_getaddrinfo(JNIEnv* env, jclass, jstring javaName) { |
| if (javaName == NULL) { |
| jniThrowNullPointerException(env, NULL); |
| return NULL; |
| } |
| const char* name = env->GetStringUTFChars(javaName, NULL); |
| jobjectArray out = InetAddress_getaddrinfoImpl(env, name); |
| env->ReleaseStringUTFChars(javaName, name); |
| return out; |
| } |
| |
| |
| /** |
| * Looks up the name corresponding to an IP address. |
| * |
| * @param javaAddress: a byte array containing the raw IP address bytes. Must be |
| * 4 or 16 bytes long. |
| * @return the hostname. |
| * @throws UnknownHostException: the IP address has no associated hostname. |
| */ |
| static jstring InetAddress_getnameinfo(JNIEnv* env, jclass, |
| jbyteArray javaAddress) |
| { |
| if (javaAddress == NULL) { |
| jniThrowNullPointerException(env, NULL); |
| return NULL; |
| } |
| |
| // Convert the raw address bytes into a socket address structure. |
| struct sockaddr_storage ss; |
| memset(&ss, 0, sizeof(ss)); |
| |
| size_t socklen; |
| const size_t addressLength = env->GetArrayLength(javaAddress); |
| if (addressLength == 4) { |
| struct sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(&ss); |
| sin->sin_family = AF_INET; |
| socklen = sizeof(struct sockaddr_in); |
| jbyte* dst = reinterpret_cast<jbyte*>(&sin->sin_addr.s_addr); |
| env->GetByteArrayRegion(javaAddress, 0, 4, dst); |
| } else if (addressLength == 16) { |
| struct sockaddr_in6 *sin6 = reinterpret_cast<sockaddr_in6*>(&ss); |
| sin6->sin6_family = AF_INET6; |
| socklen = sizeof(struct sockaddr_in6); |
| jbyte* dst = reinterpret_cast<jbyte*>(&sin6->sin6_addr.s6_addr); |
| env->GetByteArrayRegion(javaAddress, 0, 16, dst); |
| } else { |
| // The caller already throws an exception in this case. Don't worry |
| // about it here. |
| return NULL; |
| } |
| |
| // Look up the host name from the IP address. |
| char name[NI_MAXHOST]; |
| int ret = getnameinfo(reinterpret_cast<sockaddr*>(&ss), socklen, |
| name, sizeof(name), NULL, 0, NI_NAMEREQD); |
| if (ret != 0) { |
| jniThrowException(env, "java/net/UnknownHostException", gai_strerror(ret)); |
| return NULL; |
| } |
| |
| return env->NewStringUTF(name); |
| } |
| |
| static JNINativeMethod gMethods[] = { |
| { "getaddrinfo", "(Ljava/lang/String;)[[B", (void*) InetAddress_getaddrinfo }, |
| { "gethostname", "()Ljava/lang/String;", (void*) InetAddress_gethostname }, |
| { "getnameinfo", "([B)Ljava/lang/String;", (void*) InetAddress_getnameinfo }, |
| }; |
| int register_java_net_InetAddress(JNIEnv* env) { |
| jclass tempClass = env->FindClass("[B"); |
| if (tempClass) { |
| byteArrayClass = (jclass) env->NewGlobalRef(tempClass); |
| } |
| if (!byteArrayClass) { |
| LOGE("register_java_net_InetAddress: cannot allocate byte array class"); |
| return -1; |
| } |
| return jniRegisterNativeMethods(env, "java/net/InetAddress", |
| gMethods, NELEM(gMethods)); |
| } |