Project creation; initial screen send capability

telnet.go

@@ -0,0 +1,27 @@
+// This file is part of https://github.com/racingmars/go3270/
+// Copyright 2020 by Matthew R. Wilson, licensed under the MIT license. See
+// LICENSE in the project root for license information.
+
+package go3270
+
+import "io"
+
+// NegotiateTelnet will naively (e.g. not checking client responses) negotiate
+// the options necessary for tn3270 on a new telnet connection, conn.
+func NegotiateTelnet(conn io.ReadWriter) error {
+	rbuf := make([]byte, 255)
+
+	conn.Write([]byte{0xff, 0xfd, 0x18}) // DO TermType
+	conn.Read(rbuf)
+	conn.Write([]byte{0xff, 0xfa, 0x18, 0x01, 0xff, 0xf0}) // TermType suboptions
+	conn.Read(rbuf)
+	conn.Write([]byte{0xff, 0xfd, 0x19}) // DO EOR
+	conn.Read(rbuf)
+	conn.Write([]byte{0xff, 0xfd, 0x00}) // DO Binary
+	conn.Read(rbuf)
+
+	conn.Write([]byte{0xff, 0xfb, 0x19, 0xff, 0xfb, 0x00}) // WILL binary, eor
+	conn.Read(rbuf)
+
+	return nil
+}