JDK14/Java14源码在线阅读
/*
* Copyright (c) 1997, 2019, 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 "net_util.h"
#include "java_net_InetAddress.h"
#include "java_net_SocketOptions.h"
// Taken from mstcpip.h in Windows SDK 8.0 or newer.
#define SIO_LOOPBACK_FAST_PATH _WSAIOW(IOC_VENDOR,16)
#ifndef IPTOS_TOS_MASK
#define IPTOS_TOS_MASK 0x1e
#endif
#ifndef IPTOS_PREC_MASK
#define IPTOS_PREC_MASK 0xe0
#endif
/* true if SO_RCVTIMEO is supported */
jboolean isRcvTimeoutSupported = JNI_TRUE;
/*
* Table of Windows Sockets errors, the specific exception we
* throw for the error, and the error text.
*
* Note that this table excludes OS dependent errors.
*
* Latest list of Windows Sockets errors can be found at :-
* http://msdn.microsoft.com/library/psdk/winsock/errors_3wc2.htm
*/
static struct {
int errCode;
const char *exc;
const char *errString;
} const winsock_errors[] = {
{ WSAEACCES, 0, "Permission denied" },
{ WSAEADDRINUSE, "BindException", "Address already in use" },
{ WSAEADDRNOTAVAIL, "BindException", "Cannot assign requested address" },
{ WSAEAFNOSUPPORT, 0, "Address family not supported by protocol family" },
{ WSAEALREADY, 0, "Operation already in progress" },
{ WSAECONNABORTED, 0, "Software caused connection abort" },
{ WSAECONNREFUSED, "ConnectException", "Connection refused" },
{ WSAECONNRESET, 0, "Connection reset by peer" },
{ WSAEDESTADDRREQ, 0, "Destination address required" },
{ WSAEFAULT, 0, "Bad address" },
{ WSAEHOSTDOWN, 0, "Host is down" },
{ WSAEHOSTUNREACH, "NoRouteToHostException", "No route to host" },
{ WSAEINPROGRESS, 0, "Operation now in progress" },
{ WSAEINTR, 0, "Interrupted function call" },
{ WSAEINVAL, 0, "Invalid argument" },
{ WSAEISCONN, 0, "Socket is already connected" },
{ WSAEMFILE, 0, "Too many open files" },
{ WSAEMSGSIZE, 0, "The message is larger than the maximum supported by the underlying transport" },
{ WSAENETDOWN, 0, "Network is down" },
{ WSAENETRESET, 0, "Network dropped connection on reset" },
{ WSAENETUNREACH, 0, "Network is unreachable" },
{ WSAENOBUFS, 0, "No buffer space available (maximum connections reached?)" },
{ WSAENOPROTOOPT, 0, "Bad protocol option" },
{ WSAENOTCONN, 0, "Socket is not connected" },
{ WSAENOTSOCK, 0, "Socket operation on nonsocket" },
{ WSAEOPNOTSUPP, 0, "Operation not supported" },
{ WSAEPFNOSUPPORT, 0, "Protocol family not supported" },
{ WSAEPROCLIM, 0, "Too many processes" },
{ WSAEPROTONOSUPPORT, 0, "Protocol not supported" },
{ WSAEPROTOTYPE, 0, "Protocol wrong type for socket" },
{ WSAESHUTDOWN, 0, "Cannot send after socket shutdown" },
{ WSAESOCKTNOSUPPORT, 0, "Socket type not supported" },
{ WSAETIMEDOUT, "ConnectException", "Connection timed out" },
{ WSATYPE_NOT_FOUND, 0, "Class type not found" },
{ WSAEWOULDBLOCK, 0, "Resource temporarily unavailable" },
{ WSAHOST_NOT_FOUND, 0, "Host not found" },
{ WSA_NOT_ENOUGH_MEMORY, 0, "Insufficient memory available" },
{ WSANOTINITIALISED, 0, "Successful WSAStartup not yet performed" },
{ WSANO_DATA, 0, "Valid name, no data record of requested type" },
{ WSANO_RECOVERY, 0, "This is a nonrecoverable error" },
{ WSASYSNOTREADY, 0, "Network subsystem is unavailable" },
{ WSATRY_AGAIN, 0, "Nonauthoritative host not found" },
{ WSAVERNOTSUPPORTED, 0, "Winsock.dll version out of range" },
{ WSAEDISCON, 0, "Graceful shutdown in progress" },
{ WSA_OPERATION_ABORTED, 0, "Overlapped operation aborted" },
};
/*
* Initialize Windows Sockets API support
*/
BOOL WINAPI
DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved)
{
WSADATA wsadata;
switch (reason) {
case DLL_PROCESS_ATTACH:
if (WSAStartup(MAKEWORD(2,2), &wsadata) != 0) {
return FALSE;
}
break;
case DLL_PROCESS_DETACH:
WSACleanup();
break;
default:
break;
}
return TRUE;
}
void platformInit() {}
void parseExclusiveBindProperty(JNIEnv *env) {}
/*
* Since winsock doesn't have the equivalent of strerror(errno)
* use table to lookup error text for the error.
*/
JNIEXPORT void JNICALL
NET_ThrowNew(JNIEnv *env, int errorNum, char *msg)
{
int i;
int table_size = sizeof(winsock_errors) /
sizeof(winsock_errors[0]);
char exc[256];
char fullMsg[256];
char *excP = NULL;
/*
* If exception already throw then don't overwrite it.
*/
if ((*env)->ExceptionOccurred(env)) {
return;
}
/*
* Default message text if not provided
*/
if (!msg) {
msg = "no further information";
}
/*
* Check table for known winsock errors
*/
i=0;
while (i < table_size) {
if (errorNum == winsock_errors[i].errCode) {
break;
}
i++;
}
/*
* If found get pick the specific exception and error
* message corresponding to this error.
*/
if (i < table_size) {
excP = (char *)winsock_errors[i].exc;
jio_snprintf(fullMsg, sizeof(fullMsg), "%s: %s",
(char *)winsock_errors[i].errString, msg);
} else {
jio_snprintf(fullMsg, sizeof(fullMsg),
"Unrecognized Windows Sockets error: %d: %s",
errorNum, msg);
}
/*
* Throw SocketException if no specific exception for this
* error.
*/
if (excP == NULL) {
excP = "SocketException";
}
sprintf(exc, "%s%s", JNU_JAVANETPKG, excP);
JNU_ThrowByName(env, exc, fullMsg);
}
void
NET_ThrowCurrent(JNIEnv *env, char *msg)
{
NET_ThrowNew(env, WSAGetLastError(), msg);
}
void
NET_ThrowByNameWithLastError(JNIEnv *env, const char *name,
const char *defaultDetail) {
JNU_ThrowByNameWithMessageAndLastError(env, name, defaultDetail);
}
jfieldID
NET_GetFileDescriptorID(JNIEnv *env)
{
jclass cls = (*env)->FindClass(env, "java/io/FileDescriptor");
CHECK_NULL_RETURN(cls, NULL);
return (*env)->GetFieldID(env, cls, "fd", "I");
}
jint IPv4_supported()
{
/* TODO: properly check for IPv4 support on Windows */
return JNI_TRUE;
}
jint IPv6_supported()
{
SOCKET s = socket(AF_INET6, SOCK_STREAM, 0) ;
if (s == INVALID_SOCKET) {
return JNI_FALSE;
}
closesocket(s);
return JNI_TRUE;
}
jint reuseport_supported()
{
/* SO_REUSEPORT is not supported on Windows */
return JNI_FALSE;
}
/* call NET_MapSocketOptionV6 for the IPv6 fd only
* and NET_MapSocketOption for the IPv4 fd
*/
JNIEXPORT int JNICALL
NET_MapSocketOptionV6(jint cmd, int *level, int *optname) {
switch (cmd) {
case java_net_SocketOptions_IP_MULTICAST_IF:
case java_net_SocketOptions_IP_MULTICAST_IF2:
*level = IPPROTO_IPV6;
*optname = IPV6_MULTICAST_IF;
return 0;
case java_net_SocketOptions_IP_MULTICAST_LOOP:
*level = IPPROTO_IPV6;
*optname = IPV6_MULTICAST_LOOP;
return 0;
}
return NET_MapSocketOption (cmd, level, optname);
}
/*
* Map the Java level socket option to the platform specific
* level and option name.
*/
JNIEXPORT int JNICALL
NET_MapSocketOption(jint cmd, int *level, int *optname) {
typedef struct {
jint cmd;
int level;
int optname;
} sockopts;
static sockopts opts[] = {
{ java_net_SocketOptions_TCP_NODELAY, IPPROTO_TCP, TCP_NODELAY },
{ java_net_SocketOptions_SO_OOBINLINE, SOL_SOCKET, SO_OOBINLINE },
{ java_net_SocketOptions_SO_LINGER, SOL_SOCKET, SO_LINGER },
{ java_net_SocketOptions_SO_SNDBUF, SOL_SOCKET, SO_SNDBUF },
{ java_net_SocketOptions_SO_RCVBUF, SOL_SOCKET, SO_RCVBUF },
{ java_net_SocketOptions_SO_KEEPALIVE, SOL_SOCKET, SO_KEEPALIVE },
{ java_net_SocketOptions_SO_REUSEADDR, SOL_SOCKET, SO_REUSEADDR },
{ java_net_SocketOptions_SO_BROADCAST, SOL_SOCKET, SO_BROADCAST },
{ java_net_SocketOptions_IP_MULTICAST_IF, IPPROTO_IP, IP_MULTICAST_IF },
{ java_net_SocketOptions_IP_MULTICAST_LOOP, IPPROTO_IP, IP_MULTICAST_LOOP },
{ java_net_SocketOptions_IP_TOS, IPPROTO_IP, IP_TOS },
};
int i;
/*
* Map the Java level option to the native level
*/
for (i=0; i<(int)(sizeof(opts) / sizeof(opts[0])); i++) {
if (cmd == opts[i].cmd) {
*level = opts[i].level;
*optname = opts[i].optname;
return 0;
}
}
/* not found */
return -1;
}
/*
* Wrapper for setsockopt dealing with Windows specific issues :-
*
* IP_TOS and IP_MULTICAST_LOOP can't be set on some Windows
* editions.
*
* The value for the type-of-service (TOS) needs to be masked
* to get consistent behaviour with other operating systems.
*/
JNIEXPORT int JNICALL
NET_SetSockOpt(int s, int level, int optname, const void *optval,
int optlen)
{
int rv = 0;
int parg = 0;
int plen = sizeof(parg);
if (level == IPPROTO_IP && optname == IP_TOS) {
int *tos = (int *)optval;
*tos &= (IPTOS_TOS_MASK | IPTOS_PREC_MASK);
}
if (optname == SO_REUSEADDR) {
/*
* Do not set SO_REUSEADDE if SO_EXCLUSIVEADDUSE is already set
*/
rv = NET_GetSockOpt(s, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char *)&parg, &plen);
if (rv == 0 && parg == 1) {
return rv;
}
}
rv = setsockopt(s, level, optname, optval, optlen);
if (rv == SOCKET_ERROR) {
/*
* IP_TOS & IP_MULTICAST_LOOP can't be set on some versions
* of Windows.
*/
if ((WSAGetLastError() == WSAENOPROTOOPT) &&
(level == IPPROTO_IP) &&
(optname == IP_TOS || optname == IP_MULTICAST_LOOP)) {
rv = 0;
}
/*
* IP_TOS can't be set on unbound UDP sockets.
*/
if ((WSAGetLastError() == WSAEINVAL) &&
(level == IPPROTO_IP) &&
(optname == IP_TOS)) {
rv = 0;
}
}
return rv;
}
/*
* Wrapper for setsockopt dealing with Windows specific issues :-
*
* IP_TOS is not supported on some versions of Windows so
* instead return the default value for the OS.
*/
JNIEXPORT int JNICALL
NET_GetSockOpt(int s, int level, int optname, void *optval,
int *optlen)
{
int rv;
if (level == IPPROTO_IPV6 && optname == IPV6_TCLASS) {
int *intopt = (int *)optval;
*intopt = 0;
*optlen = sizeof(*intopt);
return 0;
}
rv = getsockopt(s, level, optname, optval, optlen);
/*
* IPPROTO_IP/IP_TOS is not supported on some Windows
* editions so return the default type-of-service
* value.
*/
if (rv == SOCKET_ERROR) {
if (WSAGetLastError() == WSAENOPROTOOPT &&
level == IPPROTO_IP && optname == IP_TOS) {
*((int *)optval) = 0;
rv = 0;
}
}
return rv;
}
JNIEXPORT int JNICALL
NET_SocketAvailable(int s, int *pbytes) {
u_long arg;
if (ioctlsocket((SOCKET)s, FIONREAD, &arg) == SOCKET_ERROR) {
return -1;
} else {
*pbytes = (int) arg;
return 0;
}
}
/*
* Sets SO_ECLUSIVEADDRUSE if SO_REUSEADDR is not already set.
*/
void setExclusiveBind(int fd) {
int parg = 0;
int plen = sizeof(parg);
int rv = 0;
rv = NET_GetSockOpt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&parg, &plen);
if (rv == 0 && parg == 0) {
parg = 1;
rv = NET_SetSockOpt(fd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char*)&parg, plen);
}
}
/*
* Wrapper for bind winsock call - transparent converts an
* error related to binding to a port that has exclusive access
* into an error indicating the port is in use (facilitates
* better error reporting).
*
* Should be only called by the wrapper method NET_WinBind
*/
JNIEXPORT int JNICALL
NET_Bind(int s, SOCKETADDRESS *sa, int len)
{
int rv = 0;
rv = bind(s, &sa->sa, len);
if (rv == SOCKET_ERROR) {
/*
* If bind fails with WSAEACCES it means that a privileged
* process has done an exclusive bind (NT SP4/2000/XP only).
*/
if (WSAGetLastError() == WSAEACCES) {
WSASetLastError(WSAEADDRINUSE);
}
}
return rv;
}
/*
* Wrapper for NET_Bind call. Sets SO_EXCLUSIVEADDRUSE
* if required, and then calls NET_BIND
*/
JNIEXPORT int JNICALL
NET_WinBind(int s, SOCKETADDRESS *sa, int len, jboolean exclBind)
{
if (exclBind == JNI_TRUE)
setExclusiveBind(s);
return NET_Bind(s, sa, len);
}
JNIEXPORT int JNICALL
NET_SocketClose(int fd) {
struct linger l = {0, 0};
int ret = 0;
int len = sizeof (l);
if (getsockopt(fd, SOL_SOCKET, SO_LINGER, (char *)&l, &len) == 0) {
if (l.l_onoff == 0) {
shutdown(fd, SD_SEND);
}
}
ret = closesocket (fd);
return ret;
}
JNIEXPORT int JNICALL
NET_Timeout(int fd, long timeout) {
int ret;
fd_set tbl;
struct timeval t;
t.tv_sec = timeout / 1000;
t.tv_usec = (timeout % 1000) * 1000;
FD_ZERO(&tbl);
FD_SET(fd, &tbl);
ret = select (fd + 1, &tbl, 0, 0, &t);
return ret;
}
/*
* differs from NET_Timeout() as follows:
*
* If timeout = -1, it blocks forever.
*
* returns 1 or 2 depending if only one or both sockets
* fire at same time.
*
* *fdret is (one of) the active fds. If both sockets
* fire at same time, *fdret = fd always.
*/
JNIEXPORT int JNICALL
NET_Timeout2(int fd, int fd1, long timeout, int *fdret) {
int ret;
fd_set tbl;
struct timeval t, *tP = &t;
if (timeout == -1) {
tP = 0;
} else {
t.tv_sec = timeout / 1000;
t.tv_usec = (timeout % 1000) * 1000;
}
FD_ZERO(&tbl);
FD_SET(fd, &tbl);
FD_SET(fd1, &tbl);
ret = select (0, &tbl, 0, 0, tP);
switch (ret) {
case 0:
return 0; /* timeout */
case 1:
if (FD_ISSET (fd, &tbl)) {
*fdret= fd;
} else {
*fdret= fd1;
}
return 1;
case 2:
*fdret= fd;
return 2;
}
return -1;
}
void dumpAddr (char *str, void *addr) {
struct sockaddr_in6 *a = (struct sockaddr_in6 *)addr;
int family = a->sin6_family;
printf ("%s\n", str);
if (family == AF_INET) {
struct sockaddr_in *him = (struct sockaddr_in *)addr;
printf ("AF_INET: port %d: %x\n", ntohs(him->sin_port),
ntohl(him->sin_addr.s_addr));
} else {
int i;
struct in6_addr *in = &a->sin6_addr;
printf ("AF_INET6 ");
printf ("port %d ", ntohs (a->sin6_port));
printf ("flow %d ", a->sin6_flowinfo);
printf ("addr ");
for (i=0; i<7; i++) {
printf ("%04x:", ntohs(in->s6_words[i]));
}
printf ("%04x", ntohs(in->s6_words[7]));
printf (" scope %d\n", a->sin6_scope_id);
}
}
/* Macro, which cleans-up the iv6bind structure,
* closes the two sockets (if open),
* and returns SOCKET_ERROR. Used in NET_BindV6 only.
*/
#define CLOSE_SOCKETS_AND_RETURN do { \
if (fd != -1) { \
closesocket (fd); \
fd = -1; \
} \
if (ofd != -1) { \
closesocket (ofd); \
ofd = -1; \
} \
if (close_fd != -1) { \
closesocket (close_fd); \
close_fd = -1; \
} \
if (close_ofd != -1) { \
closesocket (close_ofd); \
close_ofd = -1; \
} \
b->ipv4_fd = b->ipv6_fd = -1; \
return SOCKET_ERROR; \
} while(0)
/*
* if ipv6 is available, call NET_BindV6 to bind to the required address/port.
* Because the same port number may need to be reserved in both v4 and v6 space,
* this may require socket(s) to be re-opened. Therefore, all of this information
* is passed in and returned through the ipv6bind structure.
*
* If the request is to bind to a specific address, then this (by definition) means
* only bind in either v4 or v6, and this is just the same as normal. ie. a single
* call to bind() will suffice. The other socket is closed in this case.
*
* The more complicated case is when the requested address is ::0 or 0.0.0.0.
*
* Two further cases:
* 2. If the requested port is 0 (ie. any port) then we try to bind in v4 space
* first with a wild-card port argument. We then try to bind in v6 space
* using the returned port number. If this fails, we repeat the process
* until a free port common to both spaces becomes available.
*
* 3. If the requested port is a specific port, then we just try to get that
* port in both spaces, and if it is not free in both, then the bind fails.
*
* On failure, sockets are closed and an error returned with CLOSE_SOCKETS_AND_RETURN
*/
JNIEXPORT int JNICALL
NET_BindV6(struct ipv6bind *b, jboolean exclBind) {
int fd=-1, ofd=-1, rv, len;
/* need to defer close until new sockets created */
int close_fd=-1, close_ofd=-1;
SOCKETADDRESS oaddr; /* other address to bind */
int family = b->addr->sa.sa_family;
int ofamily;
u_short port; /* requested port parameter */
u_short bound_port;
if (family == AF_INET && (b->addr->sa4.sin_addr.s_addr != INADDR_ANY)) {
/* bind to v4 only */
int ret;
ret = NET_WinBind((int)b->ipv4_fd, b->addr,
sizeof(SOCKETADDRESS), exclBind);
if (ret == SOCKET_ERROR) {
CLOSE_SOCKETS_AND_RETURN;
}
closesocket (b->ipv6_fd);
b->ipv6_fd = -1;
return 0;
}
if (family == AF_INET6 && (!IN6_IS_ADDR_ANY(&b->addr->sa6.sin6_addr))) {
/* bind to v6 only */
int ret;
ret = NET_WinBind((int)b->ipv6_fd, b->addr,
sizeof(SOCKETADDRESS), exclBind);
if (ret == SOCKET_ERROR) {
CLOSE_SOCKETS_AND_RETURN;
}
closesocket (b->ipv4_fd);
b->ipv4_fd = -1;
return 0;
}
/* We need to bind on both stacks, with the same port number */
memset (&oaddr, 0, sizeof(oaddr));
if (family == AF_INET) {
ofamily = AF_INET6;
fd = (int)b->ipv4_fd;
ofd = (int)b->ipv6_fd;
port = (u_short)GET_PORT (b->addr);
IN6ADDR_SETANY(&oaddr.sa6);
oaddr.sa6.sin6_port = port;
} else {
ofamily = AF_INET;
ofd = (int)b->ipv4_fd;
fd = (int)b->ipv6_fd;
port = (u_short)GET_PORT (b->addr);
oaddr.sa4.sin_family = AF_INET;
oaddr.sa4.sin_port = port;
oaddr.sa4.sin_addr.s_addr = INADDR_ANY;
}
rv = NET_WinBind(fd, b->addr, sizeof(SOCKETADDRESS), exclBind);
if (rv == SOCKET_ERROR) {
CLOSE_SOCKETS_AND_RETURN;
}
/* get the port and set it in the other address */
len = sizeof(SOCKETADDRESS);
if (getsockname(fd, (struct sockaddr *)b->addr, &len) == -1) {
CLOSE_SOCKETS_AND_RETURN;
}
bound_port = GET_PORT (b->addr);
SET_PORT (&oaddr, bound_port);
if ((rv = NET_WinBind(ofd, &oaddr,
sizeof(SOCKETADDRESS), exclBind)) == SOCKET_ERROR) {
int retries;
int sotype, arglen=sizeof(sotype);
/* no retries unless, the request was for any free port */
if (port != 0) {
CLOSE_SOCKETS_AND_RETURN;
}
getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype, &arglen);
#define SOCK_RETRIES 50
/* 50 is an arbitrary limit, just to ensure that this
* cannot be an endless loop. Would expect socket creation to
* succeed sooner.
*/
for (retries = 0; retries < SOCK_RETRIES; retries ++) {
int len;
close_fd = fd; fd = -1;
close_ofd = ofd; ofd = -1;
b->ipv4_fd = SOCKET_ERROR;
b->ipv6_fd = SOCKET_ERROR;
/* create two new sockets */
fd = (int)socket (family, sotype, 0);
if (fd == SOCKET_ERROR) {
CLOSE_SOCKETS_AND_RETURN;
}
ofd = (int)socket (ofamily, sotype, 0);
if (ofd == SOCKET_ERROR) {
CLOSE_SOCKETS_AND_RETURN;
}
/* bind random port on first socket */
SET_PORT (&oaddr, 0);
rv = NET_WinBind(ofd, &oaddr, sizeof(SOCKETADDRESS), exclBind);
if (rv == SOCKET_ERROR) {
CLOSE_SOCKETS_AND_RETURN;
}
/* close the original pair of sockets before continuing */
closesocket (close_fd);
closesocket (close_ofd);
close_fd = close_ofd = -1;
/* bind new port on second socket */
len = sizeof(SOCKETADDRESS);
if (getsockname(ofd, &oaddr.sa, &len) == -1) {
CLOSE_SOCKETS_AND_RETURN;
}
bound_port = GET_PORT (&oaddr);
SET_PORT (b->addr, bound_port);
rv = NET_WinBind(fd, b->addr, sizeof(SOCKETADDRESS), exclBind);
if (rv != SOCKET_ERROR) {
if (family == AF_INET) {
b->ipv4_fd = fd;
b->ipv6_fd = ofd;
} else {
b->ipv4_fd = ofd;
b->ipv6_fd = fd;
}
return 0;
}
}
CLOSE_SOCKETS_AND_RETURN;
}
return 0;
}
/**
* Enables SIO_LOOPBACK_FAST_PATH
*/
JNIEXPORT jint JNICALL
NET_EnableFastTcpLoopback(int fd) {
int enabled = 1;
DWORD result_byte_count = -1;
int result = WSAIoctl(fd,
SIO_LOOPBACK_FAST_PATH,
&enabled,
sizeof(enabled),
NULL,
0,
&result_byte_count,
NULL,
NULL);
return result == SOCKET_ERROR ? WSAGetLastError() : 0;
}
/**
* See net_util.h for documentation
*/
JNIEXPORT int JNICALL
NET_InetAddressToSockaddr(JNIEnv *env, jobject iaObj, int port,
SOCKETADDRESS *sa, int *len,
jboolean v4MappedAddress)
{
jint family = getInetAddress_family(env, iaObj);
JNU_CHECK_EXCEPTION_RETURN(env, -1);
memset((char *)sa, 0, sizeof(SOCKETADDRESS));
if (ipv6_available() &&
!(family == java_net_InetAddress_IPv4 &&
v4MappedAddress == JNI_FALSE))
{
jbyte caddr[16];
jint address;
unsigned int scopeid = 0;
if (family == java_net_InetAddress_IPv4) {
// convert to IPv4-mapped address
memset((char *)caddr, 0, 16);
address = getInetAddress_addr(env, iaObj);
JNU_CHECK_EXCEPTION_RETURN(env, -1);
if (address == INADDR_ANY) {
/* we would always prefer IPv6 wildcard address
* caddr[10] = 0xff;
* caddr[11] = 0xff; */
} else {
caddr[10] = 0xff;
caddr[11] = 0xff;
caddr[12] = ((address >> 24) & 0xff);
caddr[13] = ((address >> 16) & 0xff);
caddr[14] = ((address >> 8) & 0xff);
caddr[15] = (address & 0xff);
}
} else {
getInet6Address_ipaddress(env, iaObj, (char *)caddr);
scopeid = getInet6Address_scopeid(env, iaObj);
}
sa->sa6.sin6_port = (u_short)htons((u_short)port);
memcpy((void *)&sa->sa6.sin6_addr, caddr, sizeof(struct in6_addr));
sa->sa6.sin6_family = AF_INET6;
sa->sa6.sin6_scope_id = scopeid;
if (len != NULL) {
*len = sizeof(struct sockaddr_in6);
}
} else {
/**代码未完, 请加载全部代码(NowJava.com).**/
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