serial: ability to turn on the permissive mode from the command line

channels/serial/client/serial_main.c

@@ -53,6 +53,7 @@ typedef struct _SERIAL_DEVICE SERIAL_DEVICE;
 struct _SERIAL_DEVICE
 {
 	DEVICE device;
+	BOOL permissive;
 	SERIAL_DRIVER_ID ServerSerialDriverId;
 	HANDLE* hComm;
 
@@ -182,11 +183,7 @@ static void serial_process_irp_create(SERIAL_DEVICE* serial, IRP* irp)
 
 	_comm_setServerSerialDriver(serial->hComm, serial->ServerSerialDriverId);
 
-	/* FIXME: Appeared to be useful to setup some devices. Guess
+	_comm_set_permissive(serial->hComm, serial->permissive);
-	 * the device driver asked to setup some unsupported feature
-	 * that were not eventually used. TODO: collecting more
-	 * details, a command line argument? */
-	/* _comm_set_permissive(serial->hComm, TRUE); */
 
 	/* NOTE: binary mode/raw mode required for the redirection. On
 	 * Linux, CommCreateFileA forces this setting.
@@ -817,6 +814,21 @@ int DeviceServiceEntry(PDEVICE_SERVICE_ENTRY_POINTS pEntryPoints)
 			serial->ServerSerialDriverId = SerialDriverSerCx2Sys;
 		}
 
+
+		if (device->Permissive != NULL)
+		{
+			if (_stricmp(device->Permissive, "permissive") == 0)
+			{
+				serial->permissive = TRUE;
+			}
+			else
+			{
+				WLog_Print(serial->log, WLOG_DEBUG, "Unknown flag: %s", device->Permissive);
+				assert(FALSE);
+			}
+		}
+
+
 		WLog_Print(serial->log, WLOG_DEBUG, "Server's serial driver: %s (id: %d)", driver, serial->ServerSerialDriverId);
 		/* TODO: implement auto detection of the server's serial driver */
 

client/common/cmdline.c

@@ -253,8 +253,8 @@ int freerdp_client_print_command_line_help(int argc, char** argv)
 
 	printf("Drive Redirection: /drive:home,/home/user\n");
 	printf("Smartcard Redirection: /smartcard:<device>\n");
-	printf("Printer Redirection: /printer:<device>,<driver>\n");
+	printf("Serial Port Redirection: /serial:<name>,<device>,[SerCx2|SerCx|Serial],[permissive]\n");
-	printf("Serial Port Redirection: /serial:<device>\n");
+	printf("Serial Port Redirection: /serial:COM1,/dev/ttyS0\n");
 	printf("Parallel Port Redirection: /parallel:<device>\n");
 	printf("Printer Redirection: /printer:<device>,<driver>\n");
 	printf("\n");
@@ -422,6 +422,9 @@ int freerdp_client_add_device_channel(rdpSettings* settings, int count, char** p
 		if (count > 3)
 			serial->Driver = _strdup(params[3]);
 
+		if (count > 4)
+			serial->Permissive = _strdup(params[4]);
+
 		freerdp_device_collection_add(settings, (RDPDR_DEVICE*) serial);
 
 		return 1;

include/freerdp/settings.h

@@ -471,7 +471,8 @@ struct _RDPDR_SERIAL
 	UINT32 Type;
 	char* Name;
 	char* Path;
-	char* Driver; 
+	char* Driver;
+	char* Permissive;
 };
 typedef struct _RDPDR_SERIAL RDPDR_SERIAL;
 

winpr/libwinpr/comm/comm.h

@@ -44,12 +44,17 @@ struct winpr_comm
 	int fd_write_event; /* as of today, only used by _purge() */
 	CRITICAL_SECTION WriteLock;
 
-	/* permissive mode on errors if TRUE (default is FALSE).
+	/* permissive mode on errors. If TRUE (default is FALSE)
+	 * CommDeviceIoControl always return TRUE.
 	 *
-	 * Since not all features are supported, some devices and applications
+	 * Not all features are supported yet and an error is then returned when
-	 * can still be functional on such errors.
+	 * an application turns them on (e.g: i/o buffers > 4096). It appeared
+	 * though that devices and applications can be still functional on such
+	 * errors.
 	 *
-	 * TODO: command line switch or getting rid of it.
+	 * see also: comm_ioctl.c
+	 *
+	 * FIXME: getting rid of this flag once all features supported.
 	 */
 	BOOL permissive;