1 /* 2 * Copyright (C) 2010 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 "NetworkUtilities" 18 19 #include "NetworkUtilities.h" 20 #include <nativehelper/JNIHelp.h> 21 #include <nativehelper/JniConstants.h> 22 #include <nativehelper/ScopedLocalRef.h> 23 24 #include <arpa/inet.h> 25 #include <fcntl.h> 26 #include <stdio.h> 27 #include <string.h> 28 #include <sys/socket.h> 29 #include <sys/un.h> 30 31 jobject sockaddrToInetAddress(JNIEnv* env, const sockaddr_storage& ss, jint* port) { 32 // Convert IPv4-mapped IPv6 addresses to IPv4 addresses. 33 // The RI states "Java will never return an IPv4-mapped address". 34 const sockaddr_in6& sin6 = reinterpret_cast<const sockaddr_in6&>(ss); 35 if (ss.ss_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&sin6.sin6_addr)) { 36 // Copy the IPv6 address into the temporary sockaddr_storage. 37 sockaddr_storage tmp; 38 memset(&tmp, 0, sizeof(tmp)); 39 memcpy(&tmp, &ss, sizeof(sockaddr_in6)); 40 // Unmap it into an IPv4 address. 41 sockaddr_in& sin = reinterpret_cast<sockaddr_in&>(tmp); 42 sin.sin_family = AF_INET; 43 sin.sin_port = sin6.sin6_port; 44 memcpy(&sin.sin_addr.s_addr, &sin6.sin6_addr.s6_addr[12], 4); 45 // Do the regular conversion using the unmapped address. 46 return sockaddrToInetAddress(env, tmp, port); 47 } 48 49 const void* rawAddress; 50 size_t addressLength; 51 int sin_port = 0; 52 int scope_id = 0; 53 if (ss.ss_family == AF_INET) { 54 const sockaddr_in& sin = reinterpret_cast<const sockaddr_in&>(ss); 55 rawAddress = &sin.sin_addr.s_addr; 56 addressLength = 4; 57 sin_port = ntohs(sin.sin_port); 58 } else if (ss.ss_family == AF_INET6) { 59 const sockaddr_in6& sin6 = reinterpret_cast<const sockaddr_in6&>(ss); 60 rawAddress = &sin6.sin6_addr.s6_addr; 61 addressLength = 16; 62 sin_port = ntohs(sin6.sin6_port); 63 scope_id = sin6.sin6_scope_id; 64 } else { 65 // We can't throw SocketException. We aren't meant to see bad addresses, so seeing one 66 // really does imply an internal error. 67 jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException", 68 "sockaddrToInetAddress unsupported ss_family: %i", ss.ss_family); 69 return NULL; 70 } 71 if (port != NULL) { 72 *port = sin_port; 73 } 74 75 ScopedLocalRef<jbyteArray> byteArray(env, env->NewByteArray(addressLength)); 76 if (byteArray.get() == NULL) { 77 return NULL; 78 } 79 env->SetByteArrayRegion(byteArray.get(), 0, addressLength, 80 reinterpret_cast<const jbyte*>(rawAddress)); 81 82 static jmethodID getByAddressMethod = env->GetStaticMethodID(JniConstants::inetAddressClass, 83 "getByAddress", "(Ljava/lang/String;[BI)Ljava/net/InetAddress;"); 84 if (getByAddressMethod == NULL) { 85 return NULL; 86 } 87 return env->CallStaticObjectMethod(JniConstants::inetAddressClass, getByAddressMethod, 88 NULL, byteArray.get(), scope_id); 89 } 90 91 static bool inetAddressToSockaddr(JNIEnv* env, jobject inetAddress, int port, sockaddr_storage& ss, socklen_t& sa_len, bool map) { 92 memset(&ss, 0, sizeof(ss)); 93 sa_len = 0; 94 95 if (inetAddress == NULL) { 96 jniThrowNullPointerException(env, NULL); 97 return false; 98 } 99 100 // Get holder. 101 static jfieldID holderFid = env->GetFieldID(JniConstants::inetAddressClass, "holder", "Ljava/net/InetAddress$InetAddressHolder;"); 102 if (holderFid == NULL) { 103 return false; 104 } 105 ScopedLocalRef<jobject> holder(env, env->GetObjectField(inetAddress, holderFid)); 106 // Get the address family. 107 static jfieldID familyFid = env->GetFieldID(JniConstants::inetAddressHolderClass, "family", "I"); 108 if (familyFid == NULL) { 109 return false; 110 } 111 ss.ss_family = env->GetIntField(holder.get(), familyFid); 112 if (ss.ss_family == AF_UNSPEC) { 113 sa_len = sizeof(ss.ss_family); 114 return true; // Job done! 115 } 116 117 // Check this is an address family we support. 118 if (ss.ss_family != AF_INET && ss.ss_family != AF_INET6) { 119 jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException", 120 "inetAddressToSockaddr bad family: %i", ss.ss_family); 121 return false; 122 } 123 124 // Get the byte array that stores the IP address bytes in the InetAddress. 125 static jmethodID bytesMid = env->GetMethodID(JniConstants::inetAddressClass, "getAddress", "()[B"); 126 if (bytesMid == NULL) { 127 return false; 128 } 129 ScopedLocalRef<jbyteArray> addressBytes(env, reinterpret_cast<jbyteArray>(env->CallObjectMethod(inetAddress, bytesMid))); 130 if (env->ExceptionCheck()) { 131 return false; 132 } 133 if (addressBytes.get() == NULL) { 134 jniThrowNullPointerException(env, NULL); 135 return false; 136 } 137 138 // TODO: bionic's getnameinfo(3) seems to want its length parameter to be exactly 139 // sizeof(sockaddr_in) for an IPv4 address and sizeof (sockaddr_in6) for an 140 // IPv6 address. Fix getnameinfo so it accepts sizeof(sockaddr_storage), and 141 // then unconditionally set sa_len to sizeof(sockaddr_storage) instead of having 142 // to deal with this case by case. 143 144 // We use AF_INET6 sockets, so we want an IPv6 address (which may be a IPv4-mapped address). 145 sockaddr_in6& sin6 = reinterpret_cast<sockaddr_in6&>(ss); 146 sin6.sin6_port = htons(port); 147 if (ss.ss_family == AF_INET6) { 148 // IPv6 address. Copy the bytes... 149 jbyte* dst = reinterpret_cast<jbyte*>(&sin6.sin6_addr.s6_addr); 150 env->GetByteArrayRegion(addressBytes.get(), 0, 16, dst); 151 // ...and set the scope id... 152 static jfieldID holder6Fid = env->GetFieldID(JniConstants::inet6AddressClass, 153 "holder6", 154 "Ljava/net/Inet6Address$Inet6AddressHolder;"); 155 if (holder6Fid == NULL) { 156 return false; 157 } 158 ScopedLocalRef<jobject> holder6(env, env->GetObjectField(inetAddress, holder6Fid)); 159 static jfieldID scopeFid = env->GetFieldID(JniConstants::inet6AddressHolderClass, "scope_id", "I"); 160 sin6.sin6_scope_id = env->GetIntField(holder6.get(), scopeFid); 161 sa_len = sizeof(sockaddr_in6); 162 return true; 163 } 164 165 // Deal with Inet4Address instances. 166 if (map) { 167 // We should represent this Inet4Address as an IPv4-mapped IPv6 sockaddr_in6. 168 // Change the family... 169 sin6.sin6_family = AF_INET6; 170 // Copy the bytes... 171 jbyte* dst = reinterpret_cast<jbyte*>(&sin6.sin6_addr.s6_addr[12]); 172 env->GetByteArrayRegion(addressBytes.get(), 0, 4, dst); 173 // INADDR_ANY and in6addr_any are both all-zeros... 174 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) { 175 // ...but all other IPv4-mapped addresses are ::ffff:a.b.c.d, so insert the ffff... 176 memset(&(sin6.sin6_addr.s6_addr[10]), 0xff, 2); 177 } 178 sa_len = sizeof(sockaddr_in6); 179 } else { 180 // We should represent this Inet4Address as an IPv4 sockaddr_in. 181 sockaddr_in& sin = reinterpret_cast<sockaddr_in&>(ss); 182 sin.sin_port = htons(port); 183 jbyte* dst = reinterpret_cast<jbyte*>(&sin.sin_addr.s_addr); 184 env->GetByteArrayRegion(addressBytes.get(), 0, 4, dst); 185 sa_len = sizeof(sockaddr_in); 186 } 187 return true; 188 } 189 190 bool inetAddressToSockaddrVerbatim(JNIEnv* env, jobject inetAddress, int port, sockaddr_storage& ss, socklen_t& sa_len) { 191 return inetAddressToSockaddr(env, inetAddress, port, ss, sa_len, false); 192 } 193 194 bool inetAddressToSockaddr(JNIEnv* env, jobject inetAddress, int port, sockaddr_storage& ss, socklen_t& sa_len) { 195 return inetAddressToSockaddr(env, inetAddress, port, ss, sa_len, true); 196 } 197 198 bool setBlocking(int fd, bool blocking) { 199 int flags = fcntl(fd, F_GETFL); 200 if (flags == -1) { 201 return false; 202 } 203 204 if (!blocking) { 205 flags |= O_NONBLOCK; 206 } else { 207 flags &= ~O_NONBLOCK; 208 } 209 210 int rc = fcntl(fd, F_SETFL, flags); 211 return (rc != -1); 212 } 213
