--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/channel.h	Tue Jun 01 02:46:09 2004 +0000
@@ -0,0 +1,122 @@
+/*
+ * Dropbear - a SSH2 server
+ * 
+ * Copyright (c) 2002,2003 Matt Johnston
+ * All rights reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE. */
+
+#ifndef _CHANNEL_H_
+#define _CHANNEL_H_
+
+#include "includes.h"
+#include "buffer.h"
+
+/* channel->type values */
+#define CHANNEL_ID_NONE 0
+#define CHANNEL_ID_SESSION 1
+#define CHANNEL_ID_X11 2
+#define CHANNEL_ID_AGENT 3
+#define CHANNEL_ID_TCPDIRECT 4
+#define CHANNEL_ID_TCPFORWARDED 5
+
+#define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED    1
+#define SSH_OPEN_CONNECT_FAILED                 2
+#define SSH_OPEN_UNKNOWN_CHANNEL_TYPE           3
+#define SSH_OPEN_RESOURCE_SHORTAGE              4
+
+#define MAX_CHANNELS 60 /* simple mem restriction, includes each tcp/x11
+							connection, so can't be _too_ small */
+
+#define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */
+
+#define RECV_MAXWINDOW 6000 /* tweak */
+#define RECV_MAXPACKET 1400 /* tweak */
+#define RECV_MINWINDOW 19000 /* when we get below this, we send a windowadjust */
+
+/* a simpler way to define that we need code for listeners */
+#if !defined(DISABLE_X11FWD) || !defined(DISABLE_AUTHFWD) || \
+	!defined(DISABLE_REMOTETCPFWD)
+#define USE_LISTENERS
+#endif
+
+struct ChanType;
+
+struct Channel {
+
+	unsigned int index; /* the local channel index */
+	unsigned int remotechan;
+	unsigned int recvwindow, transwindow;
+	unsigned int recvmaxpacket, transmaxpacket;
+	void* typedata; /* a pointer to type specific data */
+	int infd; /* stdin for the program, we write to this */
+	int outfd; /* stdout for the program, we read from this */
+	int errfd; /* stdout for a program. This doesn't really fit here,
+				  but makes the code a lot tidyer without being too bad. This
+				  is -1 for channels which don't requre it. Currently only
+				  a 'session' without a pty will use it */
+	buffer *writebuf; /* data for the program */
+
+	int sentclosed, recvclosed;
+
+	/* this is set when we receive/send a channel eof packet */
+	int recveof, senteof;
+
+	int initconn; /* used for TCP forwarding, whether the channel has been
+					 fully initialised */
+
+	struct ChanType* type;
+
+};
+
+struct ChanType {
+
+	int sepfds; /* Whether this channel has seperate pipes for in/out or not */
+	char *name;
+	int (*inithandler)(struct Channel*);
+	int (*checkclose)(struct Channel*);
+	void (*reqhandler)(struct Channel*);
+	void (*closehandler)(struct Channel*);
+
+};
+
+void chaninitialise();
+void chancleanup();
+void setchannelfds(fd_set *readfd, fd_set *writefd);
+void channelio(fd_set *readfd, fd_set *writefd);
+struct Channel* newchannel(unsigned int remotechan, struct ChanType *type, 
+		unsigned int transwindow, unsigned int transmaxpacket);
+
+void recv_msg_channel_open();
+void recv_msg_channel_request();
+void send_msg_channel_failure(struct Channel *channel);
+void send_msg_channel_success(struct Channel *channel);
+void recv_msg_channel_data();
+void recv_msg_channel_window_adjust();
+void recv_msg_channel_close();
+void recv_msg_channel_eof();
+
+#ifdef USE_LISTENERS
+int send_msg_channel_open_init(int fd, struct ChanType *type,
+		const char * typestring);
+void recv_msg_channel_open_confirmation();
+void recv_msg_channel_open_failure();
+#endif
+
+#endif /* _CHANNEL_H_ */