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net.go
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net.go
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package net
import (
"fmt"
"net"
"net/netip"
"syscall"
"github.com/pterm/pterm"
"golang.org/x/exp/slices"
)
const PORT = 38999
var localAddrs = func() []string {
ad, err := net.InterfaceAddrs()
pterm.Fatal.PrintOnErrorf("Failed to get our addresses %s", err)
res := make([]string, len(ad))
for i, v := range ad {
res[i] = v.String()
}
return res
}()
func CheckIfOur(addr string) bool {
return slices.Contains(localAddrs, addr)
}
func CreateUDP() (*net.UDPConn, error) {
laddr := net.UDPAddrFromAddrPort(netip.AddrPortFrom(netip.IPv4Unspecified(), PORT))
sock, err := net.ListenUDP("udp", laddr)
if err != nil {
return nil, err
}
sysSock, err := sock.SyscallConn()
if err != nil {
return nil, err
}
err = sysSock.Control(func(fd uintptr) {
err := setSockOpt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
if err != nil {
fmt.Println("Failed to setsockopt due to " + err.Error())
return
}
err = setSockOpt(fd, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
if err != nil {
fmt.Println("Failed to setsockopt due to " + err.Error())
return
}
})
return sock, err
}