359 lines
9.4 KiB
C
359 lines
9.4 KiB
C
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#include <precomp.h>
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#include "Remote.h"
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#include "Server.h"
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//
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// This module uses mailslots to broadcast the existence of
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// this remote server to allow a form of browsing for
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// remote server instances. This is disabled in the
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// customer version of remote.exe, and can be disabled
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// in the internal version using the /v- switch to
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// remote /s.
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//
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// remoteds.c implements a listener that allows searching.
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//
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#define INITIAL_SLEEP_PERIOD (35 * 1000) // 35 seconds before first
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#define INITIAL_AD_RATE (10 * 60 * 1000) // 10 minutes between 1 & 2,
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#define MAXIMUM_AD_RATE (120 * 60 * 1000) // doubling until 120 minutes max
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OVERLAPPED olMailslot;
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HANDLE hAdTimer = INVALID_HANDLE_VALUE;
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HANDLE hMailslot = INVALID_HANDLE_VALUE;
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DWORD dwTimerInterval; // milliseconds
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BOOL bSynchAdOnly;
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BOOL bSendingToMailslot;
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char szMailslotName[64]; // netbios names are short
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char szSend[1024];
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#define MAX_MAILSLOT_SPEWS 2
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DWORD dwMailslotErrors;
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VOID
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InitAd(
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BOOL IsAdvertise
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)
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{
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DWORD cb;
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PWKSTA_INFO_101 pwki101;
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LARGE_INTEGER DueTime;
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if (IsAdvertise) {
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// Unless Win32s or Win9x support named pipe servers...
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ASSERT(OsVersionInfo.dwPlatformId == VER_PLATFORM_WIN32_NT);
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// Problems with overlapped writes to a mailslot sometimes
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// cause remote.exe to zombie on exit on NT4, undebuggable
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// and unkillable because of an abandoned RDR1 IRP which
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// never completes.
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//
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// So on NT4 we only send messages at startup and shutdown
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// and send them synchronously using a nonoverlapped handle.
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//
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bSynchAdOnly = (OsVersionInfo.dwMajorVersion <= 4);
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//
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// Get currently active computername and browser/mailslot
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// domain/workgroup using one call to NetWkstaGetInfo.
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// This is unicode-only, we'll use wsprintf's %ls to
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// convert to 8-bit characters.
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//
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// remoteds.exe needs to be run on a workstation that is
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// part of the domain or workgroup of the same name,
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// and be in broadcast range, to receive our sends.
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//
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if (NetWkstaGetInfo(NULL, 101, (LPBYTE *) &pwki101)) {
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printf("REMOTE: unable to get computer/domain name, not advertising.\n");
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return;
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}
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wsprintf(
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szMailslotName,
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"\\\\%ls\\MAILSLOT\\REMOTE\\DEBUGGERS",
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pwki101->wki101_langroup
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);
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wsprintf(
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szSend,
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"%ls\t%d\t%s\t%s",
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pwki101->wki101_computername,
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GetCurrentProcessId(),
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PipeName,
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ChildCmd
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);
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NetApiBufferFree(pwki101);
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pwki101 = NULL;
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//
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// Broadcast mailslots are limited to 400 message bytes
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//
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szSend[399] = 0;
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if (bSynchAdOnly) {
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hMailslot =
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CreateFile(
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szMailslotName,
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GENERIC_WRITE,
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FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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0,
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NULL
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);
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if (hMailslot != INVALID_HANDLE_VALUE) {
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if ( ! WriteFile(
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hMailslot,
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szSend,
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strlen(szSend) + 1,
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&cb,
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NULL
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)) {
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printf("REMOTE: WriteFile Failed on mailslot, error %d\n", GetLastError());
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}
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} else {
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printf("REMOTE: Failed to create mailslot, error %d\n", GetLastError());
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}
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} else { // we can do async mailslot I/O
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//
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// Create a waitable timer and set it to fire first in
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// INITIAL_SLEEP_PERIOD milliseconds by calling the
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// completion routine AdvertiseTimerFired. It will
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// be given an inital period of INITIAL_AD_RATE ms.
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//
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hAdTimer =
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CreateWaitableTimer(
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NULL, // security
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FALSE, // bManualReset, we want auto-reset
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NULL // unnamed
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);
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if (hAdTimer == NULL) {
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hAdTimer = INVALID_HANDLE_VALUE;
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} else {
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DueTime.QuadPart = Int32x32To64(INITIAL_SLEEP_PERIOD, -10000);
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dwTimerInterval = INITIAL_AD_RATE;
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SetWaitableTimer(
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hAdTimer,
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&DueTime,
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dwTimerInterval,
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AdvertiseTimerFired,
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0, // arg to compl. rtn
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TRUE
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);
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}
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}
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}
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}
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VOID
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ShutAd(
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BOOL IsAdvertise
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)
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{
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DWORD cb;
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BOOL b;
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if (IsAdvertise) {
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if (INVALID_HANDLE_VALUE != hAdTimer) {
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CancelWaitableTimer(hAdTimer);
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CloseHandle(hAdTimer);
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hAdTimer = INVALID_HANDLE_VALUE;
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}
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if (INVALID_HANDLE_VALUE != hMailslot &&
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! bSendingToMailslot) {
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//
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// Tell any listening remoteds's we're
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// outta here. Do this by tacking on
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// a ^B at the end of the string (as
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// in Bye).
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//
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strcat(szSend, "\x2");
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if (bSynchAdOnly) { // overlapped handle or not?
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b = WriteFile(
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hMailslot,
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szSend,
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strlen(szSend) + 1,
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&cb,
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NULL
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);
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} else {
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b = WriteFileSynch(
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hMailslot,
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szSend,
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strlen(szSend) + 1,
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&cb,
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0,
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&olMainThread
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);
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}
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if ( ! b ) {
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printf("REMOTE: WriteFile Failed on mailslot, error %d\n", GetLastError());
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}
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}
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if (INVALID_HANDLE_VALUE != hMailslot) {
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printf("\rREMOTE: closing mailslot... ");
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fflush(stdout);
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CloseHandle(hMailslot);
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hMailslot = INVALID_HANDLE_VALUE;
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printf("\r \r");
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fflush(stdout);
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}
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}
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}
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VOID
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APIENTRY
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AdvertiseTimerFired(
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LPVOID pArg,
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DWORD dwTimerLo,
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DWORD dwTimerHi
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)
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{
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UNREFERENCED_PARAMETER( pArg );
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UNREFERENCED_PARAMETER( dwTimerLo );
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UNREFERENCED_PARAMETER( dwTimerHi );
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if (INVALID_HANDLE_VALUE == hMailslot) {
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hMailslot =
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CreateFile(
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szMailslotName,
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GENERIC_WRITE,
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FILE_SHARE_WRITE,
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NULL,
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OPEN_EXISTING,
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FILE_FLAG_OVERLAPPED,
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NULL
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);
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}
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if (INVALID_HANDLE_VALUE != hMailslot) {
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ZeroMemory(&olMailslot, sizeof(olMailslot));
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bSendingToMailslot = TRUE;
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if ( ! WriteFileEx(
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hMailslot,
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szSend,
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strlen(szSend) + 1,
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&olMailslot,
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WriteMailslotCompleted
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)) {
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bSendingToMailslot = FALSE;
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if (++dwMailslotErrors <= MAX_MAILSLOT_SPEWS) {
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DWORD dwError;
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char szErrorText[512];
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dwError = GetLastError();
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FormatMessage(
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FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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dwError,
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0,
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szErrorText,
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sizeof szErrorText,
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NULL
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);
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//
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// FormatMessage has put a newline at the end of szErrorText
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//
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printf(
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"REMOTE: Advertisement failed, mailslot error %d:\n%s",
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dwError,
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szErrorText
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);
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}
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//
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// Try reopening the mailslot next time, can't hurt.
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//
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CloseHandle(hMailslot);
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hMailslot = INVALID_HANDLE_VALUE;
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}
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}
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}
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VOID
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WINAPI
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WriteMailslotCompleted(
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DWORD dwError,
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DWORD cbWritten,
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LPOVERLAPPED lpO
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)
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{
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LARGE_INTEGER DueTime;
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bSendingToMailslot = FALSE;
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if (dwError ||
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(strlen(szSend) + 1) != cbWritten) {
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if (++dwMailslotErrors <= MAX_MAILSLOT_SPEWS) {
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printf("REMOTE: write failed on mailslot, error %d cb %d (s/b %d)\n",
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dwError, cbWritten, (strlen(szSend) + 1));
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}
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return;
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}
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//
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// If we succeeded in writing the mailslot, double the timer interval
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// up to the limit.
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//
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if (dwTimerInterval < MAXIMUM_AD_RATE) {
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dwTimerInterval = max(dwTimerInterval * 2, MAXIMUM_AD_RATE);
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DueTime.QuadPart = Int32x32To64(dwTimerInterval, -10000);
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if (INVALID_HANDLE_VALUE != hAdTimer) {
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SetWaitableTimer(
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hAdTimer,
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&DueTime,
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dwTimerInterval,
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AdvertiseTimerFired,
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0, // arg to compl. rtn
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TRUE
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);
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}
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}
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}
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