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plugin.c
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plugin.c
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#include <Windows.h>
#include <Shlwapi.h>
#include "plugin.hpp"
#include "globals.h"
#define TIMEOUT 500
#define PATIENCE 300
static struct PluginStartupInfo api = { 0 };
HANDLE stopEvent = NULL;
HANDLE doneEvent = NULL;
HANDLE frcThread = NULL;
HANDLE mailbox = NULL;
typedef struct {
FRC_COMMAND_TYPE type;
WCHAR *arg;
} FRC_COMMAND;
VOID NullHandle(HANDLE *h) {
if (*h && *h != INVALID_HANDLE_VALUE)
CloseHandle(*h);
*h = NULL;
}
intptr_t FrcMessage(LPCWSTR *messages, size_t count, FARMESSAGEFLAGS flags) {
return api.Message(
&FRC_GUID_PLUG,
&FRC_GUID_FMSG,
flags, NULL,
messages, count+1, 0);
}
HANDLE FrcCreateFreeForAllMailslot() {
SECURITY_DESCRIPTOR sd = { 0 };
SECURITY_ATTRIBUTES sa = { 0 };
InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl(&sd, TRUE, NULL, FALSE);
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = &sd;
sa.bInheritHandle = TRUE;
return CreateMailslotW(FRC_MSLOT, 0, TIMEOUT, &sa);
}
DWORD WINAPI Receiver(PVOID reserved) {
HANDLE heap = GetProcessHeap();
DWORD size = MAX_PATH, bytesRead = 0;
BYTE* data = HeapAlloc(heap, HEAP_ZERO_MEMORY, size);
FRC_COMMAND cmd = {0};
ResetEvent(doneEvent);
if (data) {
OVERLAPPED ov;
ov.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
while (WaitForSingleObject(stopEvent, 0) != WAIT_OBJECT_0) {
ov.Offset = ov.OffsetHigh = 0;
ResetEvent(ov.hEvent);
BOOL success = ReadFile(mailbox, data, size, &bytesRead, &ov);
if (!success && GetLastError() == ERROR_IO_PENDING)
success = GetOverlappedResult(mailbox, &ov, &bytesRead, TRUE);
if (!success) {
DWORD err = GetLastError();
if (err == ERROR_SEM_TIMEOUT)
continue;
if (err == ERROR_INSUFFICIENT_BUFFER) {
DWORD required = 0, sizeNew = size;
PVOID dataNew;
success = GetMailslotInfo(mailbox, NULL, &required, NULL, NULL);
if (success && required != MAILSLOT_NO_MESSAGE && required > size) {
while (sizeNew < required)
sizeNew *= 2;
dataNew = HeapReAlloc(heap, HEAP_ZERO_MEMORY, data, sizeNew);
if (dataNew != NULL) {
data = dataNew;
size = sizeNew;
continue;
}
}
}
break;
} else if (bytesRead > 1) {
if (data[1] == FRC_QUIT)
break;
*(WCHAR*)(data + bytesRead - sizeof(WCHAR)) = L'\0';
if (IS_VALID_CMD(data[1])) {
cmd.type = data[1];
cmd.arg = (WCHAR*) data;
data[1] = 0;
api.AdvControl(&FRC_GUID_PLUG, ACTL_SYNCHRO, 0, &cmd);
}
}
}
CloseHandle(ov.hEvent);
HeapFree(heap, 0, data);
}
NullHandle(&mailbox);
SetEvent(doneEvent);
return 0;
}
VOID ReceiverTerminate() {
DWORD retVal = 0;
if (frcThread) {
if ((!GetExitCodeThread(frcThread, &retVal) || retVal == STILL_ACTIVE) &&
(WaitForSingleObject(frcThread, PATIENCE) != WAIT_OBJECT_0) &&
(!TerminateThread(frcThread, 1)))
RaiseException(0, EXCEPTION_NONCONTINUABLE, 0, NULL);
}
NullHandle(&frcThread);
NullHandle(&mailbox);
}
BOOL isReceiverStarted() {
if (WaitForSingleObject(doneEvent, 0) == WAIT_OBJECT_0) {
ReceiverTerminate();
return FALSE;
} else
return TRUE;
}
BOOL TerminateRemoteFRC() {
BOOL success = FALSE;
HANDLE slot = CreateFileW(FRC_MSLOT, GENERIC_WRITE,
FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (slot != INVALID_HANDLE_VALUE) {
DWORD written;
WCHAR stop = (WCHAR)(FRC_QUIT<<8);
WriteFile(slot, (LPCVOID) &stop, sizeof(stop), &written, NULL);
CloseHandle(slot);
#define SLEEP_STEP 10
for (DWORD slept = 0; slept < TIMEOUT + PATIENCE;
Sleep(SLEEP_STEP), slept += SLEEP_STEP)
# undef SLEEP_STEP
{
mailbox = FrcCreateFreeForAllMailslot();
if (mailbox != INVALID_HANDLE_VALUE)
return TRUE;
}
mailbox = NULL;
}
return FALSE;
}
BOOL ReceiverStart(BOOL quietSuccess, BOOL quietFailure, BOOL terminateOther) {
BOOL didKill = FALSE;
if (!isReceiverStarted()) {
mailbox = FrcCreateFreeForAllMailslot();
if (mailbox == INVALID_HANDLE_VALUE) {
mailbox = NULL;
if (!terminateOther && !quietFailure) {
LPCWSTR msg[] = { FRC_TITLE,
L"Unable to create mailslot, could not start FRC.",
L"Try to shutdown the other FRC instance blocking the slot?"
};
terminateOther = !FrcMessage(msg, 2, FMSG_WARNING | FMSG_MB_YESNO);
}
if (!terminateOther || !(didKill = TerminateRemoteFRC()))
return FALSE;
}
ResetEvent(doneEvent);
ResetEvent(stopEvent);
frcThread = CreateThread(NULL, 0,
(LPTHREAD_START_ROUTINE) &Receiver, NULL, 0, NULL);
if (frcThread != NULL) {
if (!quietSuccess) {
LPCWSTR msg[] = {
FRC_TITLE,
L"FRC was successfull started.",
L"A remote FRC was terminated."
};
FrcMessage(msg, didKill ? 2 : 1, FMSG_MB_OK);
}
return TRUE;
} else {
if (!quietFailure) {
LPCWSTR msg[] = { FRC_TITLE, L"FRC main thread could not be started." };
FrcMessage(msg, 1, FMSG_WARNING | FMSG_MB_OK | FMSG_ERRORTYPE);
}
return FALSE;
}
} else {
return TRUE;
}
}
BOOL ReceiverStop() {
SetEvent(stopEvent);
if (WaitForSingleObject(doneEvent, TIMEOUT + PATIENCE) != WAIT_OBJECT_0)
ReceiverTerminate();
return !isReceiverStarted();
}
BOOL FrcGoto(WCHAR* path, BOOL navinto) {
LPWSTR file = NULL;
WCHAR fileFirst = L'\0';
while (!*PathRemoveBackslashW(path));
BOOL success = PathFileExistsW(path);
if (success) {
struct FarPanelDirectory dir = { sizeof(dir) };
dir.Name = path;
if (!navinto || (GetFileAttributesW(path) & FILE_ATTRIBUTE_DIRECTORY) == 0) {
file = PathFindFileNameW(path);
if (file == path)
file = NULL;
else {
fileFirst = file[0];
file[0] = L'\0';
}
}
success = (BOOL) api.PanelControl(PANEL_ACTIVE, FCTL_SETPANELDIRECTORY, 0, &dir);
if (success && file) {
HANDLE heap = GetProcessHeap();
struct PanelInfo PanelInfo = { sizeof(PanelInfo) };
file[0] = fileFirst;
success = (BOOL) api.PanelControl(PANEL_ACTIVE, FCTL_GETPANELINFO, 0, &PanelInfo);
if (success) {
struct FarGetPluginPanelItem PanelItem = { sizeof(PanelItem) };
unsigned int i;
success = FALSE;
PanelItem.Size = 2 * MAX_PATH * sizeof(WCHAR) + sizeof(*PanelItem.Item);
PanelItem.Item = (struct PluginPanelItem*) HeapAlloc(heap, HEAP_ZERO_MEMORY, PanelItem.Size);
struct PanelRedrawInfo PanelDrawInfo = { sizeof(PanelDrawInfo) };
for (i = 0; PanelItem.Item && i < PanelInfo.ItemsNumber; i++) {
size_t size = api.PanelControl(PANEL_ACTIVE, FCTL_GETPANELITEM, i, NULL);
if (size > PanelItem.Size) {
PVOID item = HeapReAlloc(heap, HEAP_ZERO_MEMORY, PanelItem.Item, size);
if (!item) continue;
PanelItem.Item = (struct PluginPanelItem*) item;
PanelItem.Size = size;
}
if (api.PanelControl(PANEL_ACTIVE, FCTL_GETPANELITEM, i, &PanelItem)) {
if (!StrCmpIW((LPWSTR)PanelItem.Item->FileName, file)) {
success = TRUE;
PanelDrawInfo.CurrentItem = i;
break;
}
}
}
if (PanelItem.Item)
HeapFree(heap, 0, (PVOID) PanelItem.Item);
if (success)
success = (BOOL) api.PanelControl(PANEL_ACTIVE, FCTL_REDRAWPANEL, 0, &PanelDrawInfo);
}
}
}
return success;
}
BOOL FrcCopy(WCHAR* arg, BOOL escape) {
if (escape && StrChrW(arg, L' ')) {
int size = lstrlenW(arg)+1;
HANDLE heap = GetProcessHeap();
WCHAR* quot = HeapAlloc(heap, HEAP_ZERO_MEMORY, sizeof(WCHAR)*(size+2));
if (quot) {
lstrcpynW(quot+1, arg, size);
quot[size] = quot[0] = L'"';
quot[size+1] = L'\0';
api.PanelControl(PANEL_ACTIVE, FCTL_INSERTCMDLINE, 0, quot);
HeapFree(heap, 0, quot);
} else {
return FALSE;
}
} else {
api.PanelControl(PANEL_ACTIVE, FCTL_INSERTCMDLINE, 0, arg);
}
return TRUE;
}
typedef struct {
HWND leaf;
HWND root;
BOOL done;
} __GPWDATA;
BOOL CALLBACK EnumChildProc(HWND hWnd, LPARAM lParam) {
__GPWDATA* gpw = (__GPWDATA*)lParam;
if (hWnd == gpw->leaf) {
gpw->done = TRUE;
return FALSE;
} else {
EnumChildWindows(hWnd, EnumChildProc, lParam);
return !gpw->done;
}
}
BOOL CALLBACK EnumRootsProc(HWND hWnd, LPARAM lParam) {
__GPWDATA* gpw = (__GPWDATA*)lParam;
if (hWnd == gpw->leaf) {
gpw->done = TRUE;
} else {
EnumChildWindows(hWnd, EnumChildProc, lParam);
}
if (gpw->done) {
gpw->root = hWnd;
return FALSE;
} else {
return TRUE;
}
}
HWND GetRootWindow(HWND hWnd) {
__GPWDATA gpw = { hWnd, NULL, FALSE };
EnumWindows(EnumRootsProc, (LPARAM) &gpw);
if (!gpw.done || !gpw.root)
return hWnd;
return gpw.root;
}
intptr_t WINAPI ProcessSynchroEventW(const struct ProcessSynchroEventInfo * Info) {
if (Info->StructSize >= sizeof(*Info) && Info->Event == SE_COMMONSYNCHRO) {
FRC_COMMAND *cmd = (FRC_COMMAND*) Info->Param;
BOOL success = FALSE;
BOOL escaped = FALSE;
BOOL navinto = FALSE;
// The following code is required to get the terminal window when FAR is running under ConEmu. To
// restore FAR, it is necessary to obtain a handle to the terminal emulator window rather than the
// console window itself. Under ConEmu, a top-down search of all windows appears to be the only
// way to do so. Details: https://github.com/huettenhain/frc/issues/4
HWND hWnd = GetRootWindow(GetConsoleWindow());
ShowWindow(hWnd, IsIconic(hWnd) ? SW_RESTORE : SW_SHOW);
BringWindowToTop(hWnd);
SetWindowPos(hWnd, HWND_TOP, 0, 0, 0, 0, SWP_SHOWWINDOW | SWP_NOMOVE | SWP_NOSIZE);
SetForegroundWindow(hWnd);
if (cmd && cmd->arg) {
switch (cmd->type) {
case FRC_INTO:
navinto = TRUE;
case FRC_GOTO:
success = FrcGoto(cmd->arg, navinto);
break;
case FRC_QCPY:
escaped = TRUE;
case FRC_COPY:
success = FrcCopy(cmd->arg, escaped);
break;
}
}
if (!success) {
LPCWSTR msg[] = { FRC_TITLE, L"An unexpected error occurred." };
FrcMessage(msg, 1, FMSG_WARNING | FMSG_MB_OK | FMSG_ERRORTYPE);
}
return 1;
}
return 0;
}
void WINAPI SetStartupInfoW(const struct PluginStartupInfo * Info) {
struct OpenInfo oi = { sizeof(oi) };
api = *Info;
if (!stopEvent)
stopEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!doneEvent)
doneEvent = CreateEvent(NULL, TRUE, TRUE, NULL);
oi.OpenFrom = OPEN_VIEWER;
OpenW(&oi);
}
HANDLE WINAPI OpenW(const struct OpenInfo *Info) {
if (Info->OpenFrom == OPEN_FROMMACRO || Info->OpenFrom == OPEN_LUAMACRO) {
struct OpenMacroInfo *Args = (struct OpenMacroInfo *) Info->Data;
if ((Args != NULL) && (Args->Count > 0) && (Args->Values[0].Type == FMVT_STRING)) {
if (ReceiverStart(TRUE, FALSE, TRUE)) {
LPCWSTR command = Args->Values[0].Value.String;
LPCWSTR parameters = NULL;
if (Args->Count > 1 && Args->Values[1].Type == FMVT_STRING)
parameters = Args->Values[1].Value.String;
return ShellExecuteW(NULL, L"open", command, parameters, NULL, SW_SHOWNORMAL);
} else
return NULL;
}
}
if (isReceiverStarted()) {
LPCWSTR messages[] = { FRC_TITLE, L"FRC is currently running. Do you want to stop it?" };
if (FrcMessage(messages, 1, FMSG_MB_YESNO) == 0) {
ReceiverStop();
return (HANDLE)1;
} else {
return frcThread;
}
} else {
BOOL q = (Info->OpenFrom == OPEN_VIEWER);
ReceiverStart(q, q, FALSE);
return frcThread;
}
}
void WINAPI GetGlobalInfoW(struct GlobalInfo *Info) {
Info->StructSize = sizeof(struct GlobalInfo);
Info->MinFarVersion = MAKEFARVERSION(3, 0, 0, 2927, VS_RELEASE);
Info->Version = MAKEFARVERSION(2, 4, 0, 0, VS_RELEASE);
Info->Guid = FRC_GUID_PLUG;
Info->Title = L"FRC";
Info->Description = L"FAR Remote Control";
Info->Author = L"Jesko Hüttenhain";
}
EXTERN_C BOOL WINAPI _DllMainCRTStartup(HINSTANCE instance, DWORD reason, LPVOID reserved) {
switch (reason) {
case DLL_PROCESS_ATTACH:
break;
case DLL_PROCESS_DETACH:
ExitFARW(NULL);
break;
}
return TRUE;
}
void WINAPI ExitFARW(const struct ExitInfo * Info) {
ReceiverStop();
NullHandle(&stopEvent);
NullHandle(&doneEvent);
}
void WINAPI GetPluginInfoW(struct PluginInfo *Info) {
Info->StructSize = sizeof(struct PluginInfo);
Info->Flags = PF_DIALOG | PF_PRELOAD;
Info->PluginMenu.Guids = &FRC_GUID_PLUG;
Info->PluginMenu.Strings = &FRC_TITLE;
Info->PluginMenu.Count = 1;
}