fix bugs and make it run basically

pkg/port/iscsit/conn.go

@@ -0,0 +1,125 @@
+/*
+Copyright 2016 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 (
+	"net"
+
+	"github.com/gostor/gotgt/pkg/api"
+)
+
+const (
+	CONN_STATE_FREE           = 0
+	CONN_STATE_SECURITY       = 1
+	CONN_STATE_SECURITY_AUTH  = 2
+	CONN_STATE_SECURITY_DONE  = 3
+	CONN_STATE_SECURITY_LOGIN = 4
+	CONN_STATE_SECURITY_FULL  = 5
+	CONN_STATE_LOGIN          = 6
+	CONN_STATE_LOGIN_FULL     = 7
+	CONN_STATE_FULL           = 8
+	CONN_STATE_KERNEL         = 9
+	CONN_STATE_CLOSE          = 10
+	CONN_STATE_EXIT           = 11
+	CONN_STATE_SCSI           = 12
+	CONN_STATE_INIT           = 13
+	CONN_STATE_START          = 14
+	CONN_STATE_READY          = 15
+)
+
+var (
+	DATAIN  byte = 0x01
+	DATAOUT byte = 0x10
+)
+
+type iscsiConnection struct {
+	state          int
+	authState      int
+	session        *ISCSISession
+	sessionType    int
+	sessionParam   []ISCSISessionParam
+	tid            int
+	cid            uint16
+	rxIOState      int
+	txIOState      int
+	refcount       int
+	conn           net.Conn
+	initiator      string
+	initiatorAlias string
+
+	rxBuffer []byte
+	txBuffer []byte
+	req      *ISCSICommand
+	resp     *ISCSICommand
+
+	// StatSN - the status sequence number on this connection
+	statSN uint32
+	// ExpStatSN - the expected status sequence number on this connection
+	expStatSN uint32
+	// CmdSN - the command sequence number at the target
+	cmdSN uint32
+	// ExpCmdSN - the next expected command sequence number at the target
+	expCmdSN uint32
+	// MaxCmdSN - the maximum CmdSN acceptable at the target from this initiator
+	maxCmdSN uint32
+
+	rxTask *iscsiTask
+	txTask *iscsiTask
+
+	authMethod AuthMethod
+}
+
+type taskState int
+
+const (
+	taskPending taskState = 1
+	taskSCSI    taskState = 2
+)
+
+type iscsiTask struct {
+	tag   uint32
+	conn  *iscsiConnection
+	cmd   *ISCSICommand
+	scmd  *api.SCSICommand
+	state taskState
+}
+
+func (c *iscsiConnection) init() {
+	c.state = CONN_STATE_FREE
+	c.refcount = 1
+	c.sessionParam = []ISCSISessionParam{}
+	for _, param := range sessionKeys {
+		c.sessionParam = append(c.sessionParam, ISCSISessionParam{Value: param.def})
+	}
+}
+
+func (c *iscsiConnection) readData(size int) ([]byte, int, error) {
+	var buf = make([]byte, size)
+	length, err := c.conn.Read(buf)
+	if err != nil {
+		return nil, -1, err
+	}
+	return buf, length, nil
+}
+
+func (c *iscsiConnection) write(resp []byte) (int, error) {
+	return c.conn.Write(resp)
+}
+
+func (c *iscsiConnection) close() {
+	c.conn.Close()
+}