sshd session will not echo password in an app/program run within sshd session

Fixes problem #143 ; Turning off echo does not work. Now "net use" to
mount a drive or sftp, scp, run within a ssh session will not echo
password.

Author: quamrulmina

channels.c

@@ -2511,7 +2511,11 @@ channel_input_data(int type, u_int32_t seq, void *ctxt)
 							}
 						}
 						else {
-							buffer_append(&c->input, data, data_len);
+							// avoid echoing if echo is tuned off by the current running application
+							DWORD dwGlobalConsoleMode;
+							GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &dwGlobalConsoleMode);
+							if (dwGlobalConsoleMode &  (ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT))
+								buffer_append(&c->input, data, data_len);
 							charinline += data_len; // one more char on the line
 						}