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addr.go
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addr.go
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package core
/*
#cgo CFLAGS: -I./c/include
#include "lwip/tcp.h"
#include <stdlib.h>
*/
import "C"
import (
"errors"
"fmt"
"net"
"unsafe"
)
// ipaddr_ntoa() is using a global static buffer to return result,
// reentrants are not allowed, caller is required to lock lwipMutex.
func ipAddrNTOA(ipaddr C.struct_ip_addr) string {
return C.GoString(C.ipaddr_ntoa(&ipaddr))
}
func ipAddrATON(cp string, addr *C.struct_ip_addr) error {
ccp := C.CString(cp)
defer C.free(unsafe.Pointer(ccp))
if r := C.ipaddr_aton(ccp, addr); r == 0 {
return errors.New("failed to convert IP address")
} else {
return nil
}
}
func ParseTCPAddr(addr string, port uint16) net.Addr {
ip := net.ParseIP(addr).To4()
if ip != nil {
// Seems an IPv4 address.
netAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:%d", addr, port))
if err != nil {
return nil
}
return netAddr
}
ip = net.ParseIP(addr).To16()
if ip != nil {
// Seems an IPv6 address.
netAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("[%s]:%d", addr, port))
if err != nil {
return nil
}
return netAddr
}
return nil
}
func ParseUDPAddr(addr string, port uint16) net.Addr {
ip := net.ParseIP(addr).To4()
if ip != nil {
// Seems an IPv4 address.
netAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", addr, port))
if err != nil {
return nil
}
return netAddr
}
ip = net.ParseIP(addr).To16()
if ip != nil {
// Seems an IPv6 address.
netAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("[%s]:%d", addr, port))
if err != nil {
return nil
}
return netAddr
}
return nil
}