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/*
* Copyright (C) 2010 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 "NetworkUtilities"
#include "NetworkUtilities.h"
#include "JNIHelp.h"
#include "JniConstants.h"
#include <arpa/inet.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
static bool byteArrayToSocketAddress(JNIEnv* env, jbyteArray byteArray, int port, sockaddr_storage* ss) {
if (byteArray == NULL) {
jniThrowNullPointerException(env, NULL);
return false;
}
// Convert the IP address bytes to the proper IP address type.
size_t addressLength = env->GetArrayLength(byteArray);
memset(ss, 0, sizeof(*ss));
if (addressLength == 4) {
// IPv4 address.
sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(ss);
sin->sin_family = AF_INET;
sin->sin_port = htons(port);
jbyte* dst = reinterpret_cast<jbyte*>(&sin->sin_addr.s_addr);
env->GetByteArrayRegion(byteArray, 0, 4, dst);
} else if (addressLength == 16) {
// IPv6 address.
sockaddr_in6* sin6 = reinterpret_cast<sockaddr_in6*>(ss);
sin6->sin6_family = AF_INET6;
sin6->sin6_port = htons(port);
jbyte* dst = reinterpret_cast<jbyte*>(&sin6->sin6_addr.s6_addr);
env->GetByteArrayRegion(byteArray, 0, 16, dst);
} else {
// We can't throw SocketException. We aren't meant to see bad addresses, so seeing one
// really does imply an internal error.
// TODO: fix the code (native and Java) so we don't paint ourselves into this corner.
jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",
"byteArrayToSocketAddress bad array length (%i)", addressLength);
return false;
}
return true;
}
static jbyteArray socketAddressToByteArray(JNIEnv* env, const sockaddr_storage* ss) {
// Convert IPv4-mapped addresses to IPv4 addresses.
// The RI states "Java will never return an IPv4-mapped address".
sockaddr_storage tmp;
memset(&tmp, 0, sizeof(tmp));
const sockaddr_in6* sin6 = reinterpret_cast<const sockaddr_in6*>(ss);
if (ss->ss_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
// Copy the IPv6 address into the temporary sockaddr_storage.
memcpy(&tmp, ss, sizeof(tmp));
// Unmap it into an IPv4 address.
sockaddr_in* sin = reinterpret_cast<sockaddr_in*>(&tmp);
sin->sin_family = AF_INET;
sin->sin_port = sin6->sin6_port;
memcpy(&sin->sin_addr.s_addr, &sin6->sin6_addr.s6_addr[12], 4);
// Fall through into the regular conversion using the unmapped address.
ss = &tmp;
}
const void* rawAddress;
size_t addressLength;
if (ss->ss_family == AF_INET) {
const sockaddr_in* sin = reinterpret_cast<const sockaddr_in*>(ss);
rawAddress = &sin->sin_addr.s_addr;
addressLength = 4;
} else if (ss->ss_family == AF_INET6) {
const sockaddr_in6* sin6 = reinterpret_cast<const sockaddr_in6*>(ss);
rawAddress = &sin6->sin6_addr.s6_addr;
addressLength = 16;
} else {
// We can't throw SocketException. We aren't meant to see bad addresses, so seeing one
// really does imply an internal error.
// TODO: fix the code (native and Java) so we don't paint ourselves into this corner.
jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",
"socketAddressToByteArray bad ss_family (%i)", ss->ss_family);
return NULL;
}
jbyteArray byteArray = env->NewByteArray(addressLength);
if (byteArray == NULL) {
return NULL;
}
env->SetByteArrayRegion(byteArray, 0, addressLength, reinterpret_cast<const jbyte*>(rawAddress));
return byteArray;
}
static jobject byteArrayToInetAddress(JNIEnv* env, jbyteArray byteArray) {
if (byteArray == NULL) {
return NULL;
}
jmethodID getByAddressMethod = env->GetStaticMethodID(JniConstants::inetAddressClass,
"getByAddress", "([B)Ljava/net/InetAddress;");
if (getByAddressMethod == NULL) {
return NULL;
}
return env->CallStaticObjectMethod(JniConstants::inetAddressClass, getByAddressMethod, byteArray);
}
jobject socketAddressToInetAddress(JNIEnv* env, const sockaddr_storage* ss) {
jbyteArray byteArray = socketAddressToByteArray(env, ss);
return byteArrayToInetAddress(env, byteArray);
}
bool inetAddressToSocketAddress(JNIEnv* env, jobject inetAddress, int port, sockaddr_storage* ss) {
// Get the byte array that stores the IP address bytes in the InetAddress.
if (inetAddress == NULL) {
jniThrowNullPointerException(env, NULL);
return false;
}
static jfieldID fid = env->GetFieldID(JniConstants::inetAddressClass, "ipaddress", "[B");
jbyteArray addressBytes = reinterpret_cast<jbyteArray>(env->GetObjectField(inetAddress, fid));
return byteArrayToSocketAddress(env, addressBytes, port, ss);
}
bool setBlocking(int fd, bool blocking) {
int flags = fcntl(fd, F_GETFL);
if (flags == -1) {
return false;
}
if (!blocking) {
flags |= O_NONBLOCK;
} else {
flags &= ~O_NONBLOCK;
}
int rc = fcntl(fd, F_SETFL, flags);
return (rc != -1);
}
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