/
socket_unix.go
87 lines (76 loc) · 1.88 KB
/
socket_unix.go
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//go:build !windows
package server
import (
"errors"
"fmt"
"net/netip"
"golang.org/x/sys/unix"
)
func newSocket() Socket {
fd, sockErr := unix.Socket(unix.SOCK_DGRAM, unix.AF_INET, 0)
if sockErr != nil {
panic(fmt.Errorf("error creating socket: %w", sockErr))
}
return &socket{
fd: fd,
}
}
type socket struct {
fd int
}
func (s *socket) Open(localAddr netip.AddrPort) error {
sAddr, addrErr := addrPortToSockaddr(localAddr)
if addrErr != nil {
return addrErr
}
if bindErr := unix.Bind(s.fd, sAddr); bindErr != nil {
return bindErr
}
return nil
}
func (s *socket) Close() error {
return unix.Close(s.fd)
}
func (s *socket) Send(remoteAddr netip.AddrPort, data []byte) error {
sAddr, addrErr := addrPortToSockaddr(remoteAddr)
if addrErr != nil {
return addrErr
}
return unix.Sendto(s.fd, data, 0, sAddr)
}
func (s *socket) Receive(data []byte) (int, netip.AddrPort, error) {
n, sAddr, recvErr := unix.Recvfrom(s.fd, data, 0)
if recvErr != nil {
return n, netip.AddrPort{}, recvErr
}
addr, addrErr := sockaddrToAddrPort(sAddr)
if addrErr != nil {
return n, netip.AddrPort{}, addrErr
}
return n, addr, nil
}
func addrPortToSockaddr(addr netip.AddrPort) (unix.Sockaddr, error) {
if addr.Addr().Is4() {
return &unix.SockaddrInet4{
Addr: addr.Addr().As4(),
Port: int(addr.Port()),
}, nil
}
if addr.Addr().Is6() {
return &unix.SockaddrInet6{
Addr: addr.Addr().As16(),
Port: int(addr.Port()),
}, nil
}
return nil, errors.New("invalid address")
}
func sockaddrToAddrPort(addr unix.Sockaddr) (netip.AddrPort, error) {
switch addr := addr.(type) {
case *unix.SockaddrInet4:
return netip.AddrPortFrom(netip.AddrFrom4(addr.Addr), uint16(addr.Port)), nil
case *unix.SockaddrInet6:
return netip.AddrPortFrom(netip.AddrFrom16(addr.Addr), uint16(addr.Port)), nil
default:
return netip.AddrPort{}, fmt.Errorf("unsupported sockaddr type: %T", addr)
}
}