Java example source code file (Net.c)
The Net.c Java example source code
/*
* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include "sun_nio_ch_Net.h"
#include "net_util.h"
#include "net_util_md.h"
#include "nio_util.h"
#include "nio.h"
#include "sun_nio_ch_PollArrayWrapper.h"
/**
* IP_MULTICAST_ALL supported since 2.6.31 but may not be available at
* build time.
*/
#ifdef __linux__
#ifndef IP_MULTICAST_ALL
#define IP_MULTICAST_ALL 49
#endif
#endif
#ifdef _ALLBSD_SOURCE
#ifndef IP_BLOCK_SOURCE
#define IP_ADD_SOURCE_MEMBERSHIP 70 /* join a source-specific group */
#define IP_DROP_SOURCE_MEMBERSHIP 71 /* drop a single source */
#define IP_BLOCK_SOURCE 72 /* block a source */
#define IP_UNBLOCK_SOURCE 73 /* unblock a source */
#endif /* IP_BLOCK_SOURCE */
#ifndef MCAST_BLOCK_SOURCE
#define MCAST_JOIN_SOURCE_GROUP 82 /* join a source-specific group */
#define MCAST_LEAVE_SOURCE_GROUP 83 /* leave a single source */
#define MCAST_BLOCK_SOURCE 84 /* block a source */
#define MCAST_UNBLOCK_SOURCE 85 /* unblock a source */
#endif /* MCAST_BLOCK_SOURCE */
#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif /* IPV6_ADD_MEMBERSHIP */
struct my_ip_mreq_source {
struct in_addr imr_multiaddr;
struct in_addr imr_interface;
struct in_addr imr_sourceaddr;
};
struct my_group_source_req {
uint32_t gsr_interface; /* interface index */
struct sockaddr_storage gsr_group; /* group address */
struct sockaddr_storage gsr_source; /* source address */
};
#else /* _ALLBSD_SOURCE */
#define my_ip_mreq_source ip_mreq_source
#define my_group_source_req group_source_req
#endif
#define COPY_INET6_ADDRESS(env, source, target) \
(*env)->GetByteArrayRegion(env, source, 0, 16, target)
/*
* Copy IPv6 group, interface index, and IPv6 source address
* into group_source_req structure.
*/
#ifdef AF_INET6
static void initGroupSourceReq(JNIEnv* env, jbyteArray group, jint index,
jbyteArray source, struct my_group_source_req* req)
{
struct sockaddr_in6* sin6;
req->gsr_interface = (uint32_t)index;
sin6 = (struct sockaddr_in6*)&(req->gsr_group);
sin6->sin6_family = AF_INET6;
COPY_INET6_ADDRESS(env, group, (jbyte*)&(sin6->sin6_addr));
sin6 = (struct sockaddr_in6*)&(req->gsr_source);
sin6->sin6_family = AF_INET6;
COPY_INET6_ADDRESS(env, source, (jbyte*)&(sin6->sin6_addr));
}
#endif
JNIEXPORT void JNICALL
Java_sun_nio_ch_Net_initIDs(JNIEnv *env, jclass clazz)
{
/* Here because Windows native code does need to init IDs */
}
JNIEXPORT jboolean JNICALL
Java_sun_nio_ch_Net_isIPv6Available0(JNIEnv* env, jclass cl)
{
return (ipv6_available()) ? JNI_TRUE : JNI_FALSE;
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_isExclusiveBindAvailable(JNIEnv *env, jclass clazz) {
return -1;
}
JNIEXPORT jboolean JNICALL
Java_sun_nio_ch_Net_canIPv6SocketJoinIPv4Group0(JNIEnv* env, jclass cl)
{
#ifdef MACOSX
/* for now IPv6 sockets cannot join IPv4 multicast groups */
return JNI_FALSE;
#else
return JNI_TRUE;
#endif
}
JNIEXPORT jboolean JNICALL
Java_sun_nio_ch_Net_canJoin6WithIPv4Group0(JNIEnv* env, jclass cl)
{
#ifdef __solaris__
return JNI_TRUE;
#else
return JNI_FALSE;
#endif
}
JNIEXPORT int JNICALL
Java_sun_nio_ch_Net_socket0(JNIEnv *env, jclass cl, jboolean preferIPv6,
jboolean stream, jboolean reuse)
{
int fd;
int type = (stream ? SOCK_STREAM : SOCK_DGRAM);
#ifdef AF_INET6
int domain = (ipv6_available() && preferIPv6) ? AF_INET6 : AF_INET;
#else
int domain = AF_INET;
#endif
fd = socket(domain, type, 0);
if (fd < 0) {
return handleSocketError(env, errno);
}
#ifdef AF_INET6
/* Disable IPV6_V6ONLY to ensure dual-socket support */
if (domain == AF_INET6) {
int arg = 0;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (char*)&arg,
sizeof(int)) < 0) {
JNU_ThrowByNameWithLastError(env,
JNU_JAVANETPKG "SocketException",
"Unable to set IPV6_V6ONLY");
close(fd);
return -1;
}
}
#endif
if (reuse) {
int arg = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&arg,
sizeof(arg)) < 0) {
JNU_ThrowByNameWithLastError(env,
JNU_JAVANETPKG "SocketException",
"Unable to set SO_REUSEADDR");
close(fd);
return -1;
}
}
#if defined(__linux__)
if (type == SOCK_DGRAM) {
int arg = 0;
int level = (domain == AF_INET6) ? IPPROTO_IPV6 : IPPROTO_IP;
if ((setsockopt(fd, level, IP_MULTICAST_ALL, (char*)&arg, sizeof(arg)) < 0) &&
(errno != ENOPROTOOPT)) {
JNU_ThrowByNameWithLastError(env,
JNU_JAVANETPKG "SocketException",
"Unable to set IP_MULTICAST_ALL");
close(fd);
return -1;
}
}
#endif
#if defined(__linux__) && defined(AF_INET6)
/* By default, Linux uses the route default */
if (domain == AF_INET6 && type == SOCK_DGRAM) {
int arg = 1;
if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &arg,
sizeof(arg)) < 0) {
JNU_ThrowByNameWithLastError(env,
JNU_JAVANETPKG "SocketException",
"Unable to set IPV6_MULTICAST_HOPS");
close(fd);
return -1;
}
}
#endif
return fd;
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_Net_bind0(JNIEnv *env, jclass clazz, jobject fdo, jboolean preferIPv6,
jboolean useExclBind, jobject iao, int port)
{
SOCKADDR sa;
int sa_len = SOCKADDR_LEN;
int rv = 0;
if (NET_InetAddressToSockaddr(env, iao, port, (struct sockaddr *)&sa, &sa_len, preferIPv6) != 0) {
return;
}
rv = NET_Bind(fdval(env, fdo), (struct sockaddr *)&sa, sa_len);
if (rv != 0) {
handleSocketError(env, errno);
}
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_Net_listen(JNIEnv *env, jclass cl, jobject fdo, jint backlog)
{
if (listen(fdval(env, fdo), backlog) < 0)
handleSocketError(env, errno);
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_connect0(JNIEnv *env, jclass clazz, jboolean preferIPv6,
jobject fdo, jobject iao, jint port)
{
SOCKADDR sa;
int sa_len = SOCKADDR_LEN;
int rv;
if (NET_InetAddressToSockaddr(env, iao, port, (struct sockaddr *) &sa,
&sa_len, preferIPv6) != 0)
{
return IOS_THROWN;
}
rv = connect(fdval(env, fdo), (struct sockaddr *)&sa, sa_len);
if (rv != 0) {
if (errno == EINPROGRESS) {
return IOS_UNAVAILABLE;
} else if (errno == EINTR) {
return IOS_INTERRUPTED;
}
return handleSocketError(env, errno);
}
return 1;
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_localPort(JNIEnv *env, jclass clazz, jobject fdo)
{
SOCKADDR sa;
socklen_t sa_len = SOCKADDR_LEN;
if (getsockname(fdval(env, fdo), (struct sockaddr *)&sa, &sa_len) < 0) {
#ifdef _ALLBSD_SOURCE
/*
* XXXBSD:
* ECONNRESET is specific to the BSDs. We can not return an error,
* as the calling Java code with raise a java.lang.Error given the expectation
* that getsockname() will never fail. According to the Single UNIX Specification,
* it shouldn't fail. As such, we just fill in generic Linux-compatible values.
*/
if (errno == ECONNRESET) {
struct sockaddr_in *sin;
sin = (struct sockaddr_in *) &sa;
bzero(sin, sizeof(*sin));
sin->sin_len = sizeof(struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_port = htonl(0);
sin->sin_addr.s_addr = INADDR_ANY;
} else {
handleSocketError(env, errno);
return -1;
}
#else /* _ALLBSD_SOURCE */
handleSocketError(env, errno);
return -1;
#endif /* _ALLBSD_SOURCE */
}
return NET_GetPortFromSockaddr((struct sockaddr *)&sa);
}
JNIEXPORT jobject JNICALL
Java_sun_nio_ch_Net_localInetAddress(JNIEnv *env, jclass clazz, jobject fdo)
{
SOCKADDR sa;
socklen_t sa_len = SOCKADDR_LEN;
int port;
if (getsockname(fdval(env, fdo), (struct sockaddr *)&sa, &sa_len) < 0) {
#ifdef _ALLBSD_SOURCE
/*
* XXXBSD:
* ECONNRESET is specific to the BSDs. We can not return an error,
* as the calling Java code with raise a java.lang.Error with the expectation
* that getsockname() will never fail. According to the Single UNIX Specification,
* it shouldn't fail. As such, we just fill in generic Linux-compatible values.
*/
if (errno == ECONNRESET) {
struct sockaddr_in *sin;
sin = (struct sockaddr_in *) &sa;
bzero(sin, sizeof(*sin));
sin->sin_len = sizeof(struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_port = htonl(0);
sin->sin_addr.s_addr = INADDR_ANY;
} else {
handleSocketError(env, errno);
return NULL;
}
#else /* _ALLBSD_SOURCE */
handleSocketError(env, errno);
return NULL;
#endif /* _ALLBSD_SOURCE */
}
return NET_SockaddrToInetAddress(env, (struct sockaddr *)&sa, &port);
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_getIntOption0(JNIEnv *env, jclass clazz, jobject fdo,
jboolean mayNeedConversion, jint level, jint opt)
{
int result;
struct linger linger;
u_char carg;
void *arg;
socklen_t arglen;
int n;
/* Option value is an int except for a few specific cases */
arg = (void *)&result;
arglen = sizeof(result);
if (level == IPPROTO_IP &&
(opt == IP_MULTICAST_TTL || opt == IP_MULTICAST_LOOP)) {
arg = (void*)&carg;
arglen = sizeof(carg);
}
if (level == SOL_SOCKET && opt == SO_LINGER) {
arg = (void *)&linger;
arglen = sizeof(linger);
}
if (mayNeedConversion) {
n = NET_GetSockOpt(fdval(env, fdo), level, opt, arg, (int*)&arglen);
} else {
n = getsockopt(fdval(env, fdo), level, opt, arg, &arglen);
}
if (n < 0) {
JNU_ThrowByNameWithLastError(env,
JNU_JAVANETPKG "SocketException",
"sun.nio.ch.Net.getIntOption");
return -1;
}
if (level == IPPROTO_IP &&
(opt == IP_MULTICAST_TTL || opt == IP_MULTICAST_LOOP))
{
return (jint)carg;
}
if (level == SOL_SOCKET && opt == SO_LINGER)
return linger.l_onoff ? (jint)linger.l_linger : (jint)-1;
return (jint)result;
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_Net_setIntOption0(JNIEnv *env, jclass clazz, jobject fdo,
jboolean mayNeedConversion, jint level, jint opt, jint arg)
{
int result;
struct linger linger;
u_char carg;
void *parg;
socklen_t arglen;
int n;
/* Option value is an int except for a few specific cases */
parg = (void*)&arg;
arglen = sizeof(arg);
if (level == IPPROTO_IP &&
(opt == IP_MULTICAST_TTL || opt == IP_MULTICAST_LOOP)) {
parg = (void*)&carg;
arglen = sizeof(carg);
carg = (u_char)arg;
}
if (level == SOL_SOCKET && opt == SO_LINGER) {
parg = (void *)&linger;
arglen = sizeof(linger);
if (arg >= 0) {
linger.l_onoff = 1;
linger.l_linger = arg;
} else {
linger.l_onoff = 0;
linger.l_linger = 0;
}
}
if (mayNeedConversion) {
n = NET_SetSockOpt(fdval(env, fdo), level, opt, parg, arglen);
} else {
n = setsockopt(fdval(env, fdo), level, opt, parg, arglen);
}
if (n < 0) {
JNU_ThrowByNameWithLastError(env,
JNU_JAVANETPKG "SocketException",
"sun.nio.ch.Net.setIntOption");
}
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_joinOrDrop4(JNIEnv *env, jobject this, jboolean join, jobject fdo,
jint group, jint interf, jint source)
{
struct ip_mreq mreq;
struct my_ip_mreq_source mreq_source;
int opt, n, optlen;
void* optval;
if (source == 0) {
mreq.imr_multiaddr.s_addr = htonl(group);
mreq.imr_interface.s_addr = htonl(interf);
opt = (join) ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
optval = (void*)&mreq;
optlen = sizeof(mreq);
} else {
#ifdef MACOSX
/* no IPv4 include-mode filtering for now */
return IOS_UNAVAILABLE;
#else
mreq_source.imr_multiaddr.s_addr = htonl(group);
mreq_source.imr_sourceaddr.s_addr = htonl(source);
mreq_source.imr_interface.s_addr = htonl(interf);
opt = (join) ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;
optval = (void*)&mreq_source;
optlen = sizeof(mreq_source);
#endif
}
n = setsockopt(fdval(env,fdo), IPPROTO_IP, opt, optval, optlen);
if (n < 0) {
if (join && (errno == ENOPROTOOPT))
return IOS_UNAVAILABLE;
handleSocketError(env, errno);
}
return 0;
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_blockOrUnblock4(JNIEnv *env, jobject this, jboolean block, jobject fdo,
jint group, jint interf, jint source)
{
#ifdef MACOSX
/* no IPv4 exclude-mode filtering for now */
return IOS_UNAVAILABLE;
#else
struct my_ip_mreq_source mreq_source;
int n;
int opt = (block) ? IP_BLOCK_SOURCE : IP_UNBLOCK_SOURCE;
mreq_source.imr_multiaddr.s_addr = htonl(group);
mreq_source.imr_sourceaddr.s_addr = htonl(source);
mreq_source.imr_interface.s_addr = htonl(interf);
n = setsockopt(fdval(env,fdo), IPPROTO_IP, opt,
(void*)&mreq_source, sizeof(mreq_source));
if (n < 0) {
if (block && (errno == ENOPROTOOPT))
return IOS_UNAVAILABLE;
handleSocketError(env, errno);
}
return 0;
#endif
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_joinOrDrop6(JNIEnv *env, jobject this, jboolean join, jobject fdo,
jbyteArray group, jint index, jbyteArray source)
{
#ifdef AF_INET6
struct ipv6_mreq mreq6;
struct my_group_source_req req;
int opt, n, optlen;
void* optval;
if (source == NULL) {
COPY_INET6_ADDRESS(env, group, (jbyte*)&(mreq6.ipv6mr_multiaddr));
mreq6.ipv6mr_interface = (int)index;
opt = (join) ? IPV6_ADD_MEMBERSHIP : IPV6_DROP_MEMBERSHIP;
optval = (void*)&mreq6;
optlen = sizeof(mreq6);
} else {
#ifdef MACOSX
/* no IPv6 include-mode filtering for now */
return IOS_UNAVAILABLE;
#else
initGroupSourceReq(env, group, index, source, &req);
opt = (join) ? MCAST_JOIN_SOURCE_GROUP : MCAST_LEAVE_SOURCE_GROUP;
optval = (void*)&req;
optlen = sizeof(req);
#endif
}
n = setsockopt(fdval(env,fdo), IPPROTO_IPV6, opt, optval, optlen);
if (n < 0) {
if (join && (errno == ENOPROTOOPT))
return IOS_UNAVAILABLE;
handleSocketError(env, errno);
}
return 0;
#else
JNU_ThrowInternalError(env, "Should not get here");
return IOS_THROWN;
#endif /* AF_INET6 */
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_blockOrUnblock6(JNIEnv *env, jobject this, jboolean block, jobject fdo,
jbyteArray group, jint index, jbyteArray source)
{
#ifdef AF_INET6
#ifdef MACOSX
/* no IPv6 exclude-mode filtering for now */
return IOS_UNAVAILABLE;
#else
struct my_group_source_req req;
int n;
int opt = (block) ? MCAST_BLOCK_SOURCE : MCAST_UNBLOCK_SOURCE;
initGroupSourceReq(env, group, index, source, &req);
n = setsockopt(fdval(env,fdo), IPPROTO_IPV6, opt,
(void*)&req, sizeof(req));
if (n < 0) {
if (block && (errno == ENOPROTOOPT))
return IOS_UNAVAILABLE;
handleSocketError(env, errno);
}
return 0;
#endif
#else
JNU_ThrowInternalError(env, "Should not get here");
return IOS_THROWN;
#endif
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_Net_setInterface4(JNIEnv* env, jobject this, jobject fdo, jint interf)
{
struct in_addr in;
socklen_t arglen = sizeof(struct in_addr);
int n;
in.s_addr = htonl(interf);
n = setsockopt(fdval(env, fdo), IPPROTO_IP, IP_MULTICAST_IF,
(void*)&(in.s_addr), arglen);
if (n < 0) {
handleSocketError(env, errno);
}
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_getInterface4(JNIEnv* env, jobject this, jobject fdo)
{
struct in_addr in;
socklen_t arglen = sizeof(struct in_addr);
int n;
n = getsockopt(fdval(env, fdo), IPPROTO_IP, IP_MULTICAST_IF, (void*)&in, &arglen);
if (n < 0) {
handleSocketError(env, errno);
return -1;
}
return ntohl(in.s_addr);
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_Net_setInterface6(JNIEnv* env, jobject this, jobject fdo, jint index)
{
int value = (jint)index;
socklen_t arglen = sizeof(value);
int n;
n = setsockopt(fdval(env, fdo), IPPROTO_IPV6, IPV6_MULTICAST_IF,
(void*)&(index), arglen);
if (n < 0) {
handleSocketError(env, errno);
}
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_getInterface6(JNIEnv* env, jobject this, jobject fdo)
{
int index;
socklen_t arglen = sizeof(index);
int n;
n = getsockopt(fdval(env, fdo), IPPROTO_IPV6, IPV6_MULTICAST_IF, (void*)&index, &arglen);
if (n < 0) {
handleSocketError(env, errno);
return -1;
}
return (jint)index;
}
JNIEXPORT void JNICALL
Java_sun_nio_ch_Net_shutdown(JNIEnv *env, jclass cl, jobject fdo, jint jhow)
{
int how = (jhow == sun_nio_ch_Net_SHUT_RD) ? SHUT_RD :
(jhow == sun_nio_ch_Net_SHUT_WR) ? SHUT_WR : SHUT_RDWR;
if ((shutdown(fdval(env, fdo), how) < 0) && (errno != ENOTCONN))
handleSocketError(env, errno);
}
JNIEXPORT jint JNICALL
Java_sun_nio_ch_Net_poll(JNIEnv* env, jclass this, jobject fdo, jint events, jlong timeout)
{
struct pollfd pfd;
int rv;
pfd.fd = fdval(env, fdo);
pfd.events = events;
rv = poll(&pfd, 1, timeout);
if (rv >= 0) {
return pfd.revents;
} else if (errno == EINTR) {
return IOS_INTERRUPTED;
} else {
handleSocketError(env, errno);
return IOS_THROWN;
}
}
/* Declared in nio_util.h */
jint
handleSocketError(JNIEnv *env, jint errorValue)
{
char *xn;
switch (errorValue) {
case EINPROGRESS: /* Non-blocking connect */
return 0;
#ifdef EPROTO
case EPROTO:
xn = JNU_JAVANETPKG "ProtocolException";
break;
#endif
case ECONNREFUSED:
xn = JNU_JAVANETPKG "ConnectException";
break;
case ETIMEDOUT:
xn = JNU_JAVANETPKG "ConnectException";
break;
case EHOSTUNREACH:
xn = JNU_JAVANETPKG "NoRouteToHostException";
break;
case EADDRINUSE: /* Fall through */
case EADDRNOTAVAIL:
xn = JNU_JAVANETPKG "BindException";
break;
default:
xn = JNU_JAVANETPKG "SocketException";
break;
}
errno = errorValue;
JNU_ThrowByNameWithLastError(env, xn, "NioSocketError");
return IOS_THROWN;
}
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