/*++
Copyright (c) 1998, Microsoft Corporation
Module Name:
dhcpio.c
Abstract:
This module contains code for the DHCP allocator's network I/O.
Author:
Abolade Gbadegesin (aboladeg) 5-Mar-1998
Revision History:
--*/
#include "precomp.h"
#pragma hdrstop
VOID
DhcpReadCompletionRoutine(
ULONG ErrorCode,
ULONG BytesTransferred,
PNH_BUFFER Bufferp
)
/*++
Routine Description:
This routine is invoked upon completion of a read operation
on a datagram socket bound to the DHCP server UDP port.
The message read is validated and processed, and if necessary,
a reply is generated and sent to the client.
Arguments:
ErrorCode - Win32 status code for the I/O operation
BytesTransferred - number of bytes in 'Bufferp'
Bufferp - holds data read from the datagram socket
Return Value:
none.
Environment:
Runs in the context of an RTUTILS.DLL worker-thread which has just
dequeued an I/O completion packet from the common I/O completion port
with which our datagram sockets are associated.
A reference to the component will have been made on our behalf
by 'NhReadDatagramSocket'.
--*/
{
ULONG Error;
PDHCP_HEADER Headerp;
PDHCP_INTERFACE Interfacep;
PROFILE("DhcpReadCompletionRoutine");
do {
//
// There are two cases where we don't process the message;
// (a) the I/O operation failed
// (b) the interface is no longer active
// In cases (a) we repost the buffer; in case (b) we do not.
//
Interfacep = (PDHCP_INTERFACE)Bufferp->Context;
//
// First look for an error code
//
if (ErrorCode) {
NhTrace(
TRACE_FLAG_IO,
"DhcpReadCompletionRoutine: error %d for read-context %x",
ErrorCode,
Bufferp->Context
);
//
// See if the interface is still active
//
ACQUIRE_LOCK(Interfacep);
if (!DHCP_INTERFACE_ACTIVE(Interfacep)) {
RELEASE_LOCK(Interfacep);
NhReleaseBuffer(Bufferp);
}
else {
RELEASE_LOCK(Interfacep);
EnterCriticalSection(&DhcpInterfaceLock);
if (!DHCP_REFERENCE_INTERFACE(Interfacep)) {
NhReleaseBuffer(Bufferp);
}
else {
//
// Repost the buffer for another read operation
//
Error =
NhReadDatagramSocket(
&DhcpComponentReference,
Bufferp->Socket,
Bufferp,
DhcpReadCompletionRoutine,
Bufferp->Context,
Bufferp->Context2
);
if (Error) {
ACQUIRE_LOCK(Interfacep);
DhcpDeferReadInterface(Interfacep, Bufferp->Socket);
RELEASE_LOCK(Interfacep);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
NhWarningLog(
IP_AUTO_DHCP_LOG_RECEIVE_FAILED,
Error,
"%I",
NhQueryAddressSocket(Bufferp->Socket)
);
NhReleaseBuffer(Bufferp);
}
}
LeaveCriticalSection(&DhcpInterfaceLock);
}
break;
}
//
// Now see if the interface is operational
//
ACQUIRE_LOCK(Interfacep);
if (!DHCP_INTERFACE_ACTIVE(Interfacep)) {
RELEASE_LOCK(Interfacep);
NhReleaseBuffer(Bufferp);
NhTrace(
TRACE_FLAG_IO,
"DhcpReadCompletionRoutine: interface %x inactive",
Interfacep
);
break;
}
RELEASE_LOCK(Interfacep);
//
// Now look at the message
//
Headerp = (PDHCP_HEADER)Bufferp->Buffer;
switch (Headerp->Operation) {
case BOOTP_OPERATION_REQUEST: {
DhcpProcessMessage(
Interfacep,
Bufferp
);
break;
}
case BOOTP_OPERATION_REPLY: {
InterlockedIncrement(
reinterpret_cast<LPLONG>(&DhcpStatistics.MessagesIgnored)
);
NhTrace(
TRACE_FLAG_IO,
"DhcpReadCompletionRoutine: ignoring BOOTPREPLY"
);
//
// Repost the buffer for another read operation.
//
EnterCriticalSection(&DhcpInterfaceLock);
if (!DHCP_REFERENCE_INTERFACE(Interfacep)) {
LeaveCriticalSection(&DhcpInterfaceLock);
NhReleaseBuffer(Bufferp);
}
else {
LeaveCriticalSection(&DhcpInterfaceLock);
Error =
NhReadDatagramSocket(
&DhcpComponentReference,
Bufferp->Socket,
Bufferp,
DhcpReadCompletionRoutine,
Bufferp->Context,
Bufferp->Context2
);
if (Error) {
ACQUIRE_LOCK(Interfacep);
DhcpDeferReadInterface(Interfacep, Bufferp->Socket);
RELEASE_LOCK(Interfacep);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
NhWarningLog(
IP_AUTO_DHCP_LOG_RECEIVE_FAILED,
Error,
"%I",
NhQueryAddressSocket(Bufferp->Socket)
);
NhReleaseBuffer(Bufferp);
}
}
break;
}
default: {
InterlockedIncrement(
reinterpret_cast<LPLONG>(&DhcpStatistics.MessagesIgnored)
)
;
NhTrace(
TRACE_FLAG_IO,
"DhcpReadCompletionRoutine: ignoring invalid BOOTP operation %d",
Headerp->Operation
);
NhInformationLog(
IP_AUTO_DHCP_LOG_INVALID_BOOTP_OPERATION,
0,
"%d",
Headerp->Operation
);
//
// Repost the buffer for another read operation.
//
EnterCriticalSection(&DhcpInterfaceLock);
if (!DHCP_REFERENCE_INTERFACE(Interfacep)) {
LeaveCriticalSection(&DhcpInterfaceLock);
NhReleaseBuffer(Bufferp);
}
else {
LeaveCriticalSection(&DhcpInterfaceLock);
Error =
NhReadDatagramSocket(
&DhcpComponentReference,
Bufferp->Socket,
Bufferp,
DhcpReadCompletionRoutine,
Bufferp->Context,
Bufferp->Context2
);
if (Error) {
ACQUIRE_LOCK(Interfacep);
DhcpDeferReadInterface(Interfacep, Bufferp->Socket);
RELEASE_LOCK(Interfacep);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
NhWarningLog(
IP_AUTO_DHCP_LOG_RECEIVE_FAILED,
Error,
"%I",
NhQueryAddressSocket(Bufferp->Socket)
);
NhReleaseBuffer(Bufferp);
}
}
break;
}
}
} while(FALSE);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
DEREFERENCE_DHCP();
} // DhcpReadCompletionRoutine
VOID
DhcpReadServerReplyCompletionRoutine(
ULONG ErrorCode,
ULONG BytesTransferred,
PNH_BUFFER Bufferp
)
/*++
Routine Description:
This routine is invoked upon completion of a receive-operation
on a socket bound to the DHCP client port, when the component
is attempting to detect the presence of a DHCP server.
Arguments:
ErrorCode - system-supplied status code
BytesTransferred - system-supplied byte count
Bufferp - send buffer
Return Value:
none.
Environment:
Runs in the context of an RTUTILS.DLL worker thread upon removal
of an I/O completion packet.
A reference to the component will have been made on our behalf
by 'NhReadDatagramSocket'.
--*/
{
ULONG Address;
ULONG Error;
PDHCP_INTERFACE Interfacep;
PROFILE("DhcpReadServerReplyCompletionRoutine");
Interfacep = (PDHCP_INTERFACE)Bufferp->Context;
if (ErrorCode) {
NhTrace(
TRACE_FLAG_IO,
"DhcpReadServerReplyCompletionRoutine: error %d receiving %s",
ErrorCode,
INET_NTOA(Bufferp->Context2)
);
NhReleaseBuffer(Bufferp);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
DEREFERENCE_DHCP();
return;
}
ACQUIRE_LOCK(Interfacep);
if (!DHCP_INTERFACE_ACTIVE(Interfacep)) {
RELEASE_LOCK(Interfacep);
NhReleaseBuffer(Bufferp);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
DEREFERENCE_DHCP();
return;
}
RELEASE_LOCK(Interfacep);
//
// Inspect the message read
//
Address = NhQueryAddressSocket(Bufferp->Socket);
if (NhIsLocalAddress(Bufferp->ReadAddress.sin_addr.s_addr)) {
NhTrace(
TRACE_FLAG_IO,
"DhcpReadServerReplyCompletionRoutine: ignoring, from self (%s)",
INET_NTOA(Address)
);
} else {
CHAR LocalAddress[16];
lstrcpyA(LocalAddress, INET_NTOA(Address));
NhTrace(
TRACE_FLAG_IO,
"DhcpReadServerReplyCompletionRoutine: %s found, disabling %d (%s)",
INET_NTOA(Bufferp->ReadAddress.sin_addr),
Interfacep->Index,
LocalAddress
);
//
// We received this from another server.
// We'll need to disable this interface.
//
DhcpDisableInterface(Interfacep->Index);
NhErrorLog(
IP_AUTO_DHCP_LOG_DUPLICATE_SERVER,
0,
"%I%I",
Bufferp->ReadAddress.sin_addr.s_addr,
Address
);
NhReleaseBuffer(Bufferp);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
DEREFERENCE_DHCP();
return;
}
//
// We received it from ourselves.
// Look for another server.
//
Error =
NhReadDatagramSocket(
&DhcpComponentReference,
Bufferp->Socket,
Bufferp,
DhcpReadServerReplyCompletionRoutine,
Bufferp->Context,
Bufferp->Context2
);
if (Error) {
NhTrace(
TRACE_FLAG_IO,
"DhcpReadServerReplyCompletionRoutine: error %d reposting %s",
ErrorCode,
INET_NTOA(Bufferp->Context2)
);
NhReleaseBuffer(Bufferp);
NhWarningLog(
IP_AUTO_DHCP_LOG_DETECTION_UNAVAILABLE,
Error,
"%I",
Address
);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
DEREFERENCE_DHCP();
return;
}
DEREFERENCE_DHCP();
} // DhcpReadServerReplyCompletionRoutine
VOID
DhcpWriteClientRequestCompletionRoutine(
ULONG ErrorCode,
ULONG BytesTransferred,
PNH_BUFFER Bufferp
)
/*++
Routine Description:
This routine is invoked upon completion of a send-operation
on a socket bound to the DHCP client port, when the component
is attempting to detect the presence of a DHCP server.
Arguments:
ErrorCode - system-supplied status code
BytesTransferred - system-supplied byte count
Bufferp - send buffer
Return Value:
none.
Environment:
Runs in the context of an RTUTILS.DLL worker thread upon removal
of an I/O completion packet.
A reference to the interface will have been made on our behalf
by 'DhcpWriteClientRequestMessage'.
A reference to the component will have been made on our behalf
by 'NhWriteDatagramSocket'.
--*/
{
PDHCP_INTERFACE Interfacep;
ULONG Error;
PROFILE("DhcpWriteClientRequestCompletionRoutine");
Interfacep = (PDHCP_INTERFACE)Bufferp->Context;
if (ErrorCode) {
NhTrace(
TRACE_FLAG_IO,
"DhcpWriteClientRequestCompletionRoutine: error %d broadcast %s",
ErrorCode,
INET_NTOA(Bufferp->Context2)
);
NhWarningLog(
IP_AUTO_DHCP_LOG_DETECTION_UNAVAILABLE,
ErrorCode,
"%I",
NhQueryAddressSocket(Bufferp->Socket)
);
NhReleaseBuffer(Bufferp);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
DEREFERENCE_DHCP();
return;
}
ACQUIRE_LOCK(Interfacep);
if (!DHCP_INTERFACE_ACTIVE(Interfacep)) {
RELEASE_LOCK(Interfacep);
NhReleaseBuffer(Bufferp);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
DEREFERENCE_DHCP();
return;
}
RELEASE_LOCK(Interfacep);
//
// Reuse the send buffer to listen for a response from the server
//
Error =
NhReadDatagramSocket(
&DhcpComponentReference,
Bufferp->Socket,
Bufferp,
DhcpReadServerReplyCompletionRoutine,
Bufferp->Context,
Bufferp->Context2
);
if (Error) {
NhTrace(
TRACE_FLAG_IO,
"DhcpWriteClientRequestCompletionRoutine: error %d receiving %s",
ErrorCode,
INET_NTOA(Bufferp->Context2)
);
NhWarningLog(
IP_AUTO_DHCP_LOG_DETECTION_UNAVAILABLE,
Error,
"%I",
NhQueryAddressSocket(Bufferp->Socket)
);
NhReleaseBuffer(Bufferp);
DHCP_DEREFERENCE_INTERFACE(Interfacep);
DEREFERENCE_DHCP();
return;
}
DEREFERENCE_DHCP();
} // DhcpWriteClientRequestCompletionRoutine
VOID
DhcpWriteCompletionRoutine(
ULONG ErrorCode,
ULONG BytesTransferred,
PNH_BUFFER Bufferp
)
/*++
Routine Description:
This routine is invoked upon completion of a write-operation
on a datagram socket bound to the DHCP server UDP port.
Arguments:
ErrorCode - Win32 status code for the I/O operation
BytesTransferred - number of bytes in 'Bufferp'
Bufferp - holds data read from the datagram socket
Return Value:
none.
Environment:
Runs in the context of an RTUTILS.DLL worker-thread which has just
dequeued an I/O completion packet from the common I/O completion port
with which our datagram sockets are associated.
A reference to the interface will have been made on our behalf
by the code which invoked 'NhWriteDatagramSocket'.
A reference to the component will have been made on our behalf
within 'NhWriteDatagramSocket'.
--*/
{
PDHCP_INTERFACE Interfacep;
PROFILE("DhcpWriteCompletionRoutine");
Interfacep = (PDHCP_INTERFACE)Bufferp->Context;
DHCP_DEREFERENCE_INTERFACE(Interfacep);
NhReleaseBuffer(Bufferp);
DEREFERENCE_DHCP();
} // DhcpWriteCompletionRoutine