init commit

pkg/port/iscsit/login.go

@@ -0,0 +1,85 @@
+/*
+Copyright 2015 The GoStor Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package iscsit
+
+import "bytes"
+
+func (m *Message) loginRespBytes() []byte {
+	// rfc7143 11.13
+	buf := &bytes.Buffer{}
+	// byte 0
+	buf.WriteByte(byte(OpLoginResp))
+	var b byte
+	if m.Transit {
+		b |= 0x80
+	}
+	if m.Cont {
+		b |= 0x40
+	}
+	b |= byte(m.CSG&0xff) << 2
+	b |= byte(m.NSG & 0xff)
+	// byte 1
+	buf.WriteByte(b)
+
+	b = 0
+	buf.WriteByte(b)                                     // version-max
+	buf.WriteByte(b)                                     // version-active
+	buf.WriteByte(b)                                     // ahsLen
+	buf.Write(MarshalUint64(uint64(len(m.RawData)))[5:]) // data segment length, no padding
+	buf.Write(MarshalUint64(m.ISID)[2:])
+	buf.Write(MarshalUint64(uint64(m.TSIH))[6:])
+	buf.Write(MarshalUint64(uint64(m.TaskTag))[4:])
+	buf.WriteByte(b)
+	buf.WriteByte(b)
+	buf.WriteByte(b)
+	buf.WriteByte(b) // "reserved"
+	buf.Write(MarshalUint64(uint64(m.StatSN))[4:])
+	buf.Write(MarshalUint64(uint64(m.ExpCmdSN))[4:])
+	buf.Write(MarshalUint64(uint64(m.MaxCmdSN))[4:])
+	buf.WriteByte(byte(m.StatusClass))
+	buf.WriteByte(byte(m.StatusDetail))
+	buf.WriteByte(b)
+	buf.WriteByte(b) // "reserved"
+	var bs [8]byte
+	buf.Write(bs[:])
+	rd := m.RawData
+	for len(rd)%4 != 0 {
+		rd = append(rd, 0)
+	}
+	buf.Write(rd)
+	return buf.Bytes()
+}
+
+type Stage int
+
+const (
+	SecurityNegotiation         Stage = 0
+	LoginOperationalNegotiation       = 1
+	FullFeaturePhase                  = 3
+)
+
+func (s Stage) String() string {
+	switch s {
+	case SecurityNegotiation:
+		return "Security Negotiation"
+	case LoginOperationalNegotiation:
+		return "Login Operational Negotiation"
+	case FullFeaturePhase:
+		return "Full Feature Phase"
+	}
+	return "Unknown Stage"
+}