Block arrow keys in sshd server so that it is not passed to shell/cmd or echoed

For now we avoid sending the 4 arrow keys to the shell or echo it to the
remote side. as cmd.exe or powershell does not process it correctly in
stream output device mode we run win32 sshd server.

Author: quamrulmina

channels.c

@@ -2480,8 +2480,15 @@ channel_input_data(int type, u_int32_t seq, void *ctxt)
 						}
 				}
 				else {
+					// avoid sending the 4 arrow keys out to remote for now "ESC[A" ..
+					if  ( (c->isatty) && (data_len ==3) && (data[0] == '\033') && (data[1] == '[')) {
+						if ( ( data[2] == 'A') ||  (data[2] == 'B') ||  (data[2] == 'C') ||  (data[2] == 'D'))
+								packet_check_eom();
+								return 0;
+					}
 					buffer_append(&c->output, data, data_len); // it is the sshd server, so pass it on
-					if ( c->isatty ) {  // we echo the data if it is sshd server and pty interactive mode
+					if ( c->isatty ) {  // we echo the data if it is sshd server and pty interactive mode			
+					
 						if ( (data_len ==1) && (data[0] == '\b') ) {
 							if (charinline >0) {
 								buffer_append(&c->input, "\b \b", 3); // for backspace, we need to send space and another backspace for visual erase