| /* |
| * 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 "JniConstants.h" |
| #include "LocalArray.h" |
| #include "NetworkUtilities.h" |
| #include "ScopedLocalRef.h" |
| #include "ScopedUtfChars.h" |
| #include "jni.h" |
| #include "utils/Log.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 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(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(addrinfo*, const char*) |
| { |
| } |
| #endif |
| |
| static jobjectArray InetAddress_getaddrinfo(JNIEnv* env, jclass, jstring javaName) { |
| ScopedUtfChars name(env, javaName); |
| if (name.c_str() == NULL) { |
| return NULL; |
| } |
| |
| addrinfo hints; |
| 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; |
| |
| addrinfo* addressList = NULL; |
| jobjectArray addressArray = NULL; |
| int result = getaddrinfo(name.c_str(), NULL, &hints, &addressList); |
| if (result == 0 && addressList) { |
| // Count results so we know how to size the output array. |
| int addressCount = 0; |
| for (addrinfo* ai = addressList; ai != NULL; ai = ai->ai_next) { |
| if (ai->ai_family == AF_INET || ai->ai_family == AF_INET6) { |
| addressCount++; |
| } |
| } |
| |
| // Prepare output array. |
| addressArray = env->NewObjectArray(addressCount, JniConstants::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* ai = addressList; ai != NULL; ai = ai->ai_next) { |
| sockaddr* address = ai->ai_addr; |
| size_t addressLength = 0; |
| void* rawAddress; |
| |
| switch (ai->ai_family) { |
| // Find the raw address length and start pointer. |
| case AF_INET6: |
| addressLength = 16; |
| rawAddress = &reinterpret_cast<sockaddr_in6*>(address)->sin6_addr.s6_addr; |
| logIpString(ai, name.c_str()); |
| break; |
| case AF_INET: |
| addressLength = 4; |
| rawAddress = &reinterpret_cast<sockaddr_in*>(address)->sin_addr.s_addr; |
| logIpString(ai, name.c_str()); |
| break; |
| default: |
| // Unknown address family. Skip this address. |
| LOGE("getaddrinfo: Unknown address family %d", ai->ai_family); |
| continue; |
| } |
| |
| // Convert each IP address into a Java byte array. |
| ScopedLocalRef<jbyteArray> byteArray(env, env->NewByteArray(addressLength)); |
| if (byteArray.get() == 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.get(), |
| 0, addressLength, reinterpret_cast<jbyte*>(rawAddress)); |
| env->SetObjectArrayElement(addressArray, index, byteArray.get()); |
| 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; |
| } |
| |
| /** |
| * 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. |
| sockaddr_storage ss; |
| memset(&ss, 0, sizeof(ss)); |
| |
| size_t socklen; |
| const size_t addressLength = env->GetArrayLength(javaAddress); |
| if (addressLength == 4) { |
| sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(&ss); |
| sin->sin_family = AF_INET; |
| socklen = sizeof(sockaddr_in); |
| jbyte* dst = reinterpret_cast<jbyte*>(&sin->sin_addr.s_addr); |
| env->GetByteArrayRegion(javaAddress, 0, 4, dst); |
| } else if (addressLength == 16) { |
| sockaddr_in6* sin6 = reinterpret_cast<sockaddr_in6*>(&ss); |
| sin6->sin6_family = AF_INET6; |
| socklen = sizeof(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); |
| } |
| |
| /** |
| * Convert a Java string representing an IP address to a Java byte array. |
| * The formats accepted are: |
| * - IPv4: |
| * - 1.2.3.4 |
| * - 1.2.4 |
| * - 1.4 |
| * - 4 |
| * - IPv6 |
| * - Compressed form (2001:db8::1) |
| * - Uncompressed form (2001:db8:0:0:0:0:0:1) |
| * - IPv4-compatible (::192.0.2.0) |
| * - With an embedded IPv4 address (2001:db8::192.0.2.0). |
| * IPv6 addresses may appear in square brackets. |
| * |
| * @param addressByteArray the byte array to convert. |
| * @return a string with the textual representation of the address. |
| * @throws UnknownHostException the IP address was invalid. |
| */ |
| static jbyteArray InetAddress_ipStringToByteArray(JNIEnv* env, jobject, jstring javaString) { |
| // Convert the String to UTF-8 bytes. |
| ScopedUtfChars chars(env, javaString); |
| if (chars.c_str() == NULL) { |
| return NULL; |
| } |
| size_t byteCount = chars.size(); |
| LocalArray<INET6_ADDRSTRLEN> bytes(byteCount + 1); |
| char* ipString = &bytes[0]; |
| strcpy(ipString, chars.c_str()); |
| |
| // Accept IPv6 addresses (only) in square brackets for compatibility. |
| if (ipString[0] == '[' && ipString[byteCount - 1] == ']' && strchr(ipString, ':') != NULL) { |
| memmove(ipString, ipString + 1, byteCount - 2); |
| ipString[byteCount - 2] = '\0'; |
| } |
| |
| jbyteArray result = NULL; |
| addrinfo hints; |
| memset(&hints, 0, sizeof(hints)); |
| hints.ai_flags = AI_NUMERICHOST; |
| |
| sockaddr_storage ss; |
| memset(&ss, 0, sizeof(ss)); |
| |
| addrinfo* res = NULL; |
| int ret = getaddrinfo(ipString, NULL, &hints, &res); |
| if (ret == 0 && res) { |
| // Convert IPv4-mapped addresses to IPv4 addresses. |
| // The RI states "Java will never return an IPv4-mapped address". |
| sockaddr_in6* sin6 = reinterpret_cast<sockaddr_in6*>(res->ai_addr); |
| if (res->ai_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { |
| sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(&ss); |
| sin->sin_family = AF_INET; |
| sin->sin_port = sin6->sin6_port; |
| memcpy(&sin->sin_addr.s_addr, &sin6->sin6_addr.s6_addr[12], 4); |
| result = socketAddressToByteArray(env, &ss); |
| } else { |
| result = socketAddressToByteArray(env, reinterpret_cast<sockaddr_storage*>(res->ai_addr)); |
| } |
| } else { |
| // For backwards compatibility, deal with address formats that |
| // getaddrinfo does not support. For example, 1.2.3, 1.3, and even 3 are |
| // valid IPv4 addresses according to the Java API. If getaddrinfo fails, |
| // try to use inet_aton. |
| sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(&ss); |
| if (inet_aton(ipString, &sin->sin_addr)) { |
| sin->sin_family = AF_INET; |
| sin->sin_port = 0; |
| result = socketAddressToByteArray(env, &ss); |
| } |
| } |
| |
| if (res) { |
| freeaddrinfo(res); |
| } |
| |
| if (!result) { |
| env->ExceptionClear(); |
| jniThrowException(env, "java/net/UnknownHostException", gai_strerror(ret)); |
| } |
| |
| return result; |
| } |
| |
| static jstring InetAddress_byteArrayToIpString(JNIEnv* env, jobject, jbyteArray byteArray) { |
| if (byteArray == NULL) { |
| jniThrowNullPointerException(env, NULL); |
| return NULL; |
| } |
| sockaddr_storage ss; |
| if (!byteArrayToSocketAddress(env, NULL, byteArray, 0, &ss)) { |
| return NULL; |
| } |
| // TODO: getnameinfo seems to want its length parameter to be exactly |
| // sizeof(sockaddr_in) for an IPv4 address and sizeof (sockaddr_in6) for an |
| // IPv6 address. Fix getnameinfo so it accepts sizeof(sockaddr_storage), and |
| // then remove this hack. |
| int sa_size; |
| if (ss.ss_family == AF_INET) { |
| sa_size = sizeof(sockaddr_in); |
| } else if (ss.ss_family == AF_INET6) { |
| sa_size = sizeof(sockaddr_in6); |
| } else { |
| // byteArrayToSocketAddress already threw. |
| return NULL; |
| } |
| char ipString[INET6_ADDRSTRLEN]; |
| int rc = getnameinfo(reinterpret_cast<sockaddr*>(&ss), sa_size, |
| ipString, sizeof(ipString), NULL, 0, NI_NUMERICHOST); |
| if (rc != 0) { |
| jniThrowException(env, "java/net/UnknownHostException", gai_strerror(rc)); |
| return NULL; |
| } |
| return env->NewStringUTF(ipString); |
| } |
| |
| static JNINativeMethod gMethods[] = { |
| NATIVE_METHOD(InetAddress, byteArrayToIpString, "([B)Ljava/lang/String;"), |
| NATIVE_METHOD(InetAddress, getaddrinfo, "(Ljava/lang/String;)[[B"), |
| NATIVE_METHOD(InetAddress, gethostname, "()Ljava/lang/String;"), |
| NATIVE_METHOD(InetAddress, getnameinfo, "([B)Ljava/lang/String;"), |
| NATIVE_METHOD(InetAddress, ipStringToByteArray, "(Ljava/lang/String;)[B"), |
| }; |
| int register_java_net_InetAddress(JNIEnv* env) { |
| return jniRegisterNativeMethods(env, "java/net/InetAddress", gMethods, NELEM(gMethods)); |
| } |