Add ANSI processing in ssh client pty code to detect LF to CRLF mode

Whether LF should be changed to CR-LF is determined by what the remote
sshd server wants. Sequences like ESC[20h is sent by sshd servers in pty
ANSI mode. Unix servers usually want LF and Windows servers CR-LF. Added
simple ANSI data check now for pty use in interactive mode. Need to
expand to simple ANSI engine in future for processing other ANSI
terminal attributes.

Author: quamrulmina

channels.c

@@ -2395,8 +2395,9 @@ channel_output_poll(void)
 		}
 	}
 }
-
-
+#ifdef WIN32_FIXME
+int lftocrlf = 0;
+#endif
 /* -- protocol input */
 
 /* ARGSUSED */
@@ -2452,6 +2453,17 @@ channel_input_data(int type, u_int32_t seq, void *ctxt)
 		}
 		c->local_window -= win_len;
 	}
+
+	#ifdef WIN32_FIXME
+	if ( (c->client_tty) && (data_len >= 5) ) {
+		if ( data[0] == '\033' ) { // escape char octal 33, decimal 27
+			if ( (data[1] == '[') && (data[2]== '2') && (data[3]== '0') && ( data[4]== 'h' )) {
+				lftocrlf = 1;
+			}
+		}
+	}
+	#endif
+
 	if (c->datagram)
 		buffer_put_string(&c->output, data, data_len);
 	else

clientloop.c

@@ -1320,6 +1320,14 @@ process_escapes(Channel *c, Buffer *bin, Buffer *bout, Buffer *berr,
 		 * and append it to the buffer.
 		 */
 		last_was_cr = (ch == '\r' || ch == '\n');
+		#ifdef WIN32_FIXME
+		extern int lftocrlf ; // defined in channels.c file's channel_input_data() function for now
+		if ( (lftocrlf == 1) && ( ch == '\n') ) {
+			// add a \r before \n if sshd server sent us ESC[20h during initial tty mode setting
+			buffer_put_char(bin, '\r');
+			bytes++;
+		}
+		#endif
 		buffer_put_char(bin, ch);
 		bytes++;
 	}

version.h

@@ -2,5 +2,5 @@
 
 #define SSH_VERSION	"OpenSSH_7.1"
 
-#define SSH_PORTABLE	"p1 Microsoft Pragma Win32 port Sep 30 2015"
+#define SSH_PORTABLE	"p1 Microsoft Pragma Win32 port Oct 7 2015"
 #define SSH_RELEASE	SSH_VERSION SSH_PORTABLE