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/*
* 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 "ScopedLocalRef.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.
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, (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;
}
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));
}
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