--- a/common-channel.c	Wed Jun 03 22:59:59 2015 +0800
+++ b/common-channel.c	Thu Jun 04 22:25:28 2015 +0800
@@ -38,7 +38,7 @@
 #include "netio.h"
 
 static void send_msg_channel_open_failure(unsigned int remotechan, int reason,
-		const unsigned char *text, const unsigned char *lang);
+		const char *text, const char *lang);
 static void send_msg_channel_open_confirmation(struct Channel* channel,
 		unsigned int recvwindow, 
 		unsigned int recvmaxpacket);
@@ -921,7 +921,7 @@
 /* Handle a new channel request, performing any channel-type-specific setup */
 void recv_msg_channel_open() {
 
-	unsigned char *type;
+	char *type;
 	unsigned int typelen;
 	unsigned int remotechan, transwindow, transmaxpacket;
 	struct Channel *channel;
@@ -934,7 +934,7 @@
 	TRACE(("enter recv_msg_channel_open"))
 
 	/* get the packet contents */
-	type = buf_getstring(ses.payload, &typelen);
+	type = (char *) buf_getstring(ses.payload, &typelen);
 
 	remotechan = buf_getint(ses.payload);
 	transwindow = buf_getint(ses.payload);
@@ -1039,7 +1039,7 @@
 /* Send a channel open failure message, with a corresponding reason
  * code (usually resource shortage or unknown chan type) */
 static void send_msg_channel_open_failure(unsigned int remotechan, 
-		int reason, const unsigned char *text, const unsigned char *lang) {
+		int reason, const char *text, const char *lang) {
 
 	TRACE(("enter send_msg_channel_open_failure"))
 	CHECKCLEARTOWRITE();
@@ -1047,8 +1047,8 @@
 	buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_OPEN_FAILURE);
 	buf_putint(ses.writepayload, remotechan);
 	buf_putint(ses.writepayload, reason);
-	buf_putstring(ses.writepayload, text, strlen((char*)text));
-	buf_putstring(ses.writepayload, lang, strlen((char*)lang));
+	buf_putstring(ses.writepayload, (const unsigned char *) text, strlen(text));
+	buf_putstring(ses.writepayload, (const unsigned char *) lang, strlen(lang));
 
 	encrypt_packet();
 	TRACE(("leave send_msg_channel_open_failure"))
@@ -1149,7 +1149,7 @@
 	CHECKCLEARTOWRITE();
 
 	buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_OPEN);
-	buf_putstring(ses.writepayload, type->name, strlen(type->name));
+	buf_putstring(ses.writepayload, (const unsigned char *) type->name, strlen(type->name));
 	buf_putint(ses.writepayload, chan->index);
 	buf_putint(ses.writepayload, opts.recv_window);
 	buf_putint(ses.writepayload, RECV_MAX_CHANNEL_DATA_LEN);
@@ -1244,12 +1244,12 @@
 }
 
 void start_send_channel_request(struct Channel *channel, 
-		unsigned char *type) {
+		char *type) {
 
 	CHECKCLEARTOWRITE();
 	buf_putbyte(ses.writepayload, SSH_MSG_CHANNEL_REQUEST);
 	buf_putint(ses.writepayload, channel->remotechan);
 
-	buf_putstring(ses.writepayload, type, strlen(type));
+	buf_putstring(ses.writepayload, (const unsigned char *) type, strlen(type));
 
 }