From 6ab1aa5f2156ef781da6e1b57a183825b88bef9a Mon Sep 17 00:00:00 2001
From: Fritz Elfert <felfert@to.com>
Date: Tue, 29 Jun 1999 02:23:31 +0000
Subject: Initial import

---
 ncpd/link.cc | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 ncpd/link.cc

(limited to 'ncpd/link.cc')

diff --git a/ncpd/link.cc b/ncpd/link.cc
new file mode 100644
index 0000000..f3a13df
--- /dev/null
+++ b/ncpd/link.cc
@@ -0,0 +1,166 @@
+//
+//  PLP - An implementation of the PSION link protocol
+//
+//  Copyright (C) 1999  Philip Proudman
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation; either version 2 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  e-mail philip.proudman@btinternet.com
+
+#include <stream.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "defs.h"
+#include "bool.h"
+#include "link.h"
+#include "packet.h"
+#include "bufferstore.h"
+#include "bufferarray.h"
+
+link::link(const char *fname, int baud, IOWatch & iow, bool _s5, bool _verbose):
+s5(_s5)
+{
+	p = new packet(fname, baud, iow, PACKET_LAYER_DIAGNOSTICS);
+	verbose = _verbose;
+	idSent = 0;
+	idLastGot = -1;
+	newLink = true;
+	somethingToSend = false;
+	timesSent = 0;
+	failed = false;
+}
+
+link::~link()
+{
+	delete p;
+}
+
+void link::
+send(const bufferStore & buff)
+{
+	if (buff.getLen() > 300)
+		failed = true;
+	else
+		sendQueue.pushBuffer(buff);
+}
+
+bufferArray link::
+poll()
+{
+	bufferArray ret;
+	bufferStore buff;
+	unsigned char type;
+
+	while (p->get(type, buff)) {
+		if ((type & 0xf0) == 0x30) {
+			// Data
+			int ser = type & 0x0f;
+			if (verbose)
+				cout << "link: Got data ser " << ser << " : " << buff << endl;
+			// Send ack
+			if (idLastGot != ser) {
+				idLastGot = ser;
+				ret.pushBuffer(buff);
+			} else {
+				if (verbose)
+					cout << "link: Duplicated data - not passing back, repeating ack\n";
+			}
+			if (verbose)
+				cout << "link: Send ack ser " << ser << endl;
+			bufferStore blank;
+			p->send(ser, blank);
+			break;
+		} else if ((type & 0xf0) == 0x00) {
+			// Ack
+			int ser = type & 0x0f;
+			if (ser == idSent) {
+				if (verbose)
+					cout << "link: Got ack " << ser << " : " << buff << endl;
+				somethingToSend = false;
+				timesSent = 0;
+			}
+		} else if ((type & 0xf0) == 0x20) {
+			// New link
+			int ser = type & 0x0f;
+			if (verbose)
+				cout << "link: got New link request " << ser << " : " << buff << endl;
+			idLastGot = 0;
+			bufferStore blank;
+			if (verbose)
+				cout << "link: Sending ack of new link\n";
+			somethingToSend = false;
+			p->send(idLastGot, blank);
+		} else if ((type & 0xf0) == 0x10) {
+			// Disconnect
+			cerr << "Disconnect?\n";
+			failed = true;
+			return ret;
+		}
+	}
+
+	if (!somethingToSend) {
+		countToResend = 0;
+		if (newLink) {
+			somethingToSend = true;
+			toSend.init();
+			newLink = false;
+			idSent = 0;
+		} else {
+			if (!sendQueue.empty()) {
+				somethingToSend = true;
+				toSend = sendQueue.popBuffer();
+				idSent++;
+				if (idSent > 7)
+					idSent = 0;
+			}
+		}
+	}
+	if (somethingToSend) {
+		if (countToResend == 0) {
+			timesSent++;
+			if (timesSent == 5) {
+				failed = true;
+			} else {
+				if (toSend.empty()) {
+					// Request for new link
+					if (verbose)
+						cout << "link: Send req new session ser " << idSent << endl;
+					p->send(0x20 + idSent, toSend);
+				} else {
+					if (verbose)
+						cout << "link: Send data packet ser " << idSent << " : " << toSend << endl;
+					p->send(0x30 + idSent, toSend);
+				}
+				countToResend = 5;
+			}
+		} else {
+			countToResend--;
+		}
+	}
+	return ret;
+}
+
+bool link::
+stuffToSend()
+{
+	return (somethingToSend || !sendQueue.empty());
+}
+
+bool link::
+hasFailed()
+{
+	return failed;
+}
-- 
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