/
netcp.go
115 lines (103 loc) · 3.01 KB
/
netcp.go
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package netcp
// #cgo LDFLAGS: -lcrypto
// #include <stdio.h>
// #include <openssl/sha.h>
// #include <stdlib.h>
// #include <string.h>
import "C"
import (
"encoding/binary"
"fmt"
"io"
"net"
)
//Server log
func ServerLog(m string) { //could be async
fmt.Println("ServerLog:" + m) //[" + time.Now().String() + "]" + "\n:
}
//Network establishment
func CheckAndResolveDialAddress(RemoteAddress string, RemotePort string) *net.TCPConn {
//check tcp addr and Resolve
tcpaddr, err := net.ResolveTCPAddr("tcp4", RemoteAddress+":"+RemotePort)
if err != nil {
fmt.Println("Error: Remote Adder+Port resolve fail.")
fmt.Println(RemoteAddress + RemotePort)
fmt.Println(err)
}
tcpcon, err := net.DialTCP("tcp4", nil, tcpaddr)
if err != nil {
fmt.Println("Error: Dialign Remote Adder+ Port fail.")
fmt.Println(RemoteAddress + RemotePort)
fmt.Println(err)
}
return tcpcon
}
func CheckAndListeningOnPort(localAddress string, ListiningPort string) *net.TCPListener {
//check tcp addr and Resolve
remoteTcpAdder, err := net.ResolveTCPAddr("tcp4", localAddress+ListiningPort)
if err != nil {
fmt.Println("Error: Remote Adder+Port resolve fail.")
fmt.Println(localAddress + ListiningPort)
fmt.Println(err)
return nil
}
localTCPListener, err := net.ListenTCP("tcp4", remoteTcpAdder)
if err != nil {
fmt.Println("Error: Dialign Remote Adder+ Port fail.")
fmt.Println(localAddress + ListiningPort)
fmt.Println(err)
return nil
}
return localTCPListener
}
//tcp io
//RECIVE Excact targetDataLength byte message
func ReciveConstBytes(op *net.TCPConn, targetDataLength int) (res []byte, err error) {
res = nil
for {
//read from tcp buffer
tempReadData := make([]byte, targetDataLength)
readbyte, err := op.Read(tempReadData)
if err != nil && err != io.EOF {
fmt.Println("Error: In reciveConstBytes:")
fmt.Println(err)
return nil, err
}
res = append(res[:], tempReadData[:readbyte]...)
//check if read exact wanted
if readbyte == targetDataLength {
if int(targetDataLength) != len(res) {
fmt.Println("Error: In reciveConstBytes: didnt read exact!!!")
fmt.Println("Read : ", readbyte)
}
return res, nil
//if didnt read exact wanted then recalculate targetlength and redo
} else if readbyte < targetDataLength {
targetDataLength -= readbyte
}
}
}
//RECIVE [Header]:[Data] with headerSpeace
func ReciveConstHeaderData(op *net.TCPConn, headerSpace int) ([]byte, []byte, error) {
rawheader, err := ReciveConstBytes(op, headerSpace)
header := rawheader
if err != nil {
fmt.Println("In func ReciveConstHeaderData Error:", err)
return nil, nil, err
}
if headerSpace <= 4 {
blank := []byte{0}
for i := 0; i < (4 - int(headerSpace)); i++ {
header = append(header[:], blank...)
}
}
dataLength := binary.LittleEndian.Uint32(header)
data, err := ReciveConstBytes(op, int(dataLength))
if err != nil {
fmt.Println("In func ReciveConstHeaderData Error:", err)
fmt.Println("Error: In reciveConstBytes: data")
fmt.Println(err)
return nil, nil, err
}
return rawheader, data, nil
}