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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 "ScopedLocalRef.h"
#include <arpa/inet.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
jobject sockaddrToInetAddress(JNIEnv* env, const sockaddr_storage& ss, jint* port) {
// Convert IPv4-mapped IPv6 addresses to IPv4 addresses.
// The RI states "Java will never return an IPv4-mapped address".
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.
sockaddr_storage tmp;
memset(&tmp, 0, sizeof(tmp));
memcpy(&tmp, &ss, sizeof(sockaddr_in6));
// 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);
// Do the regular conversion using the unmapped address.
return sockaddrToInetAddress(env, tmp, port);
}
const void* rawAddress;
size_t addressLength;
int sin_port = 0;
int scope_id = 0;
if (ss.ss_family == AF_INET) {
const sockaddr_in& sin = reinterpret_cast<const sockaddr_in&>(ss);
rawAddress = &sin.sin_addr.s_addr;
addressLength = 4;
sin_port = ntohs(sin.sin_port);
} 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;
sin_port = ntohs(sin6.sin6_port);
scope_id = sin6.sin6_scope_id;
} else if (ss.ss_family == AF_UNIX) {
const sockaddr_un& sun = reinterpret_cast<const sockaddr_un&>(ss);
rawAddress = &sun.sun_path;
addressLength = strlen(sun.sun_path);
} else {
// We can't throw SocketException. We aren't meant to see bad addresses, so seeing one
// really does imply an internal error.
jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",
"sockaddrToInetAddress unsupported ss_family: %i", ss.ss_family);
return NULL;
}
if (port != NULL) {
*port = sin_port;
}
ScopedLocalRef<jbyteArray> byteArray(env, env->NewByteArray(addressLength));
if (byteArray.get() == NULL) {
return NULL;
}
env->SetByteArrayRegion(byteArray.get(), 0, addressLength,
reinterpret_cast<const jbyte*>(rawAddress));
if (ss.ss_family == AF_UNIX) {
// Note that we get here for AF_UNIX sockets on accept(2). The unix(7) man page claims
// that the peer's sun_path will contain the path, but in practice it doesn't, and the
// peer length is returned as 2 (meaning only the sun_family field was set).
static jmethodID ctor = env->GetMethodID(JniConstants::inetUnixAddressClass, "<init>", "([B)V");
return env->NewObject(JniConstants::inetUnixAddressClass, ctor, byteArray.get());
}
static jmethodID getByAddressMethod = env->GetStaticMethodID(JniConstants::inetAddressClass,
"getByAddress", "(Ljava/lang/String;[BI)Ljava/net/InetAddress;");
if (getByAddressMethod == NULL) {
return NULL;
}
return env->CallStaticObjectMethod(JniConstants::inetAddressClass, getByAddressMethod,
NULL, byteArray.get(), scope_id);
}
static bool inetAddressToSockaddr(JNIEnv* env, jobject inetAddress, int port, sockaddr_storage& ss, socklen_t& sa_len, bool map) {
memset(&ss, 0, sizeof(ss));
sa_len = 0;
if (inetAddress == NULL) {
jniThrowNullPointerException(env, NULL);
return false;
}
// Get the address family.
static jfieldID familyFid = env->GetFieldID(JniConstants::inetAddressClass, "family", "I");
ss.ss_family = env->GetIntField(inetAddress, familyFid);
if (ss.ss_family == AF_UNSPEC) {
sa_len = sizeof(ss.ss_family);
return true; // Job done!
}
// Check this is an address family we support.
if (ss.ss_family != AF_INET && ss.ss_family != AF_INET6 && ss.ss_family != AF_UNIX) {
jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",
"inetAddressToSockaddr bad family: %i", ss.ss_family);
return false;
}
// Get the byte array that stores the IP address bytes in the InetAddress.
static jfieldID bytesFid = env->GetFieldID(JniConstants::inetAddressClass, "ipaddress", "[B");
ScopedLocalRef<jbyteArray> addressBytes(env, reinterpret_cast<jbyteArray>(env->GetObjectField(inetAddress, bytesFid)));
if (addressBytes.get() == NULL) {
jniThrowNullPointerException(env, NULL);
return false;
}
// Handle the AF_UNIX special case.
if (ss.ss_family == AF_UNIX) {
sockaddr_un& sun = reinterpret_cast<sockaddr_un&>(ss);
size_t path_length = env->GetArrayLength(addressBytes.get());
if (path_length >= sizeof(sun.sun_path)) {
jniThrowExceptionFmt(env, "java/lang/IllegalArgumentException",
"inetAddressToSockaddr path too long for AF_UNIX: %i", path_length);
return false;
}
// Copy the bytes...
jbyte* dst = reinterpret_cast<jbyte*>(&sun.sun_path);
memset(dst, 0, sizeof(sun.sun_path));
env->GetByteArrayRegion(addressBytes.get(), 0, path_length, dst);
sa_len = sizeof(sun.sun_path);
return true;
}
// TODO: bionic's getnameinfo(3) 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 unconditionally set sa_len to sizeof(sockaddr_storage) instead of having
// to deal with this case by case.
// We use AF_INET6 sockets, so we want an IPv6 address (which may be a IPv4-mapped address).
sockaddr_in6& sin6 = reinterpret_cast<sockaddr_in6&>(ss);
sin6.sin6_port = htons(port);
if (ss.ss_family == AF_INET6) {
// IPv6 address. Copy the bytes...
jbyte* dst = reinterpret_cast<jbyte*>(&sin6.sin6_addr.s6_addr);
env->GetByteArrayRegion(addressBytes.get(), 0, 16, dst);
// ...and set the scope id...
static jfieldID scopeFid = env->GetFieldID(JniConstants::inet6AddressClass, "scope_id", "I");
sin6.sin6_scope_id = env->GetIntField(inetAddress, scopeFid);
sa_len = sizeof(sockaddr_in6);
return true;
}
// Deal with Inet4Address instances.
if (map) {
// We should represent this Inet4Address as an IPv4-mapped IPv6 sockaddr_in6.
// Change the family...
sin6.sin6_family = AF_INET6;
// Copy the bytes...
jbyte* dst = reinterpret_cast<jbyte*>(&sin6.sin6_addr.s6_addr[12]);
env->GetByteArrayRegion(addressBytes.get(), 0, 4, dst);
// INADDR_ANY and in6addr_any are both all-zeros...
if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) {
// ...but all other IPv4-mapped addresses are ::ffff:a.b.c.d, so insert the ffff...
memset(&(sin6.sin6_addr.s6_addr[10]), 0xff, 2);
}
sa_len = sizeof(sockaddr_in6);
} else {
// We should represent this Inet4Address as an IPv4 sockaddr_in.
sockaddr_in& sin = reinterpret_cast<sockaddr_in&>(ss);
sin.sin_port = htons(port);
jbyte* dst = reinterpret_cast<jbyte*>(&sin.sin_addr.s_addr);
env->GetByteArrayRegion(addressBytes.get(), 0, 4, dst);
sa_len = sizeof(sockaddr_in);
}
return true;
}
bool inetAddressToSockaddrVerbatim(JNIEnv* env, jobject inetAddress, int port, sockaddr_storage& ss, socklen_t& sa_len) {
return inetAddressToSockaddr(env, inetAddress, port, ss, sa_len, false);
}
bool inetAddressToSockaddr(JNIEnv* env, jobject inetAddress, int port, sockaddr_storage& ss, socklen_t& sa_len) {
return inetAddressToSockaddr(env, inetAddress, port, ss, sa_len, true);
}
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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