src/java.base/windows/native/libnet/Inet4AddressImpl.c
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@@ -31,10 +31,11 @@
#include <malloc.h>
#include <sys/types.h>
#include <process.h>
#include <iphlpapi.h>
#include <icmpapi.h>
+#include <WinError.h>
#include "java_net_InetAddress.h"
#include "java_net_Inet4AddressImpl.h"
#include "net_util.h"
#include "icmp.h"
@@ -440,11 +441,19 @@
char SendData[32] = {0};
LPVOID ReplyBuffer = NULL;
DWORD ReplySize = 0;
jboolean ret = JNI_FALSE;
- ReplySize = sizeof(ICMP_ECHO_REPLY) + sizeof(SendData);
+ // https://msdn.microsoft.com/en-us/library/windows/desktop/aa366051%28v=vs.85%29.aspx
+ ReplySize = sizeof(ICMP_ECHO_REPLY) // The buffer should be large enough
+ // to hold at least one ICMP_ECHO_REPLY
+ // structure
+ + sizeof(SendData) // plus RequestSize bytes of data.
+ + 8; // This buffer should also be large enough
+ // to also hold 8 more bytes of data
+ // (the size of an ICMP error message)
+
ReplyBuffer = (VOID*) malloc(ReplySize);
if (ReplyBuffer == NULL) {
IcmpCloseHandle(hIcmpFile);
NET_ThrowNew(env, WSAGetLastError(), "Unable to allocate memory");
return JNI_FALSE;
@@ -476,15 +485,45 @@
ReplyBuffer,// LPVOID ReplyBuffer,
ReplySize, // DWORD ReplySize,
(timeout < 1000) ? 1000 : timeout); // DWORD Timeout
}
- if (dwRetVal != 0) {
+ if (dwRetVal == 0) { // if the call failed
+ TCHAR *buf;
+ DWORD err = WSAGetLastError();
+ switch (err) {
+ case ERROR_NO_NETWORK:
+ case ERROR_NETWORK_UNREACHABLE:
+ case ERROR_HOST_UNREACHABLE:
+ case ERROR_PROTOCOL_UNREACHABLE:
+ case ERROR_PORT_UNREACHABLE:
+ case ERROR_REQUEST_ABORTED:
+ case ERROR_INCORRECT_ADDRESS:
+ case ERROR_HOST_DOWN:
+ break;
+ default:
+ FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
+ NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+ (LPTSTR)&buf, 0, NULL);
+ NET_ThrowNew(env, err, buf);
+ LocalFree(buf);
+ break;
+ }
+ } else {
PICMP_ECHO_REPLY pEchoReply = (PICMP_ECHO_REPLY)ReplyBuffer;
- if ((int)pEchoReply->RoundTripTime <= timeout)
+
+ // This is to take into account the undocumented minimum
+ // timeout mentioned in the IcmpSendEcho call above.
+ // We perform an extra check to make sure that our
+ // roundtrip time was less than our desired timeout
+ // for cases where that timeout is < 1000ms.
+ if (pEchoReply->Status == IP_SUCCESS
+ && (int)pEchoReply->RoundTripTime <= timeout)
+ {
ret = JNI_TRUE;
}
+ }
free(ReplyBuffer);
IcmpCloseHandle(hIcmpFile);
return ret;