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utils_unix.go
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/
utils_unix.go
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//go:build !windows
// +build !windows
package utils
import (
"net"
"syscall"
sys "golang.org/x/sys/unix"
)
func UpdateRLimit() error {
var rLimit sys.Rlimit
err := sys.Getrlimit(sys.RLIMIT_NOFILE, &rLimit)
if err != nil {
return err
}
rLimit.Cur = rLimit.Max
return sys.Setrlimit(sys.RLIMIT_NOFILE, &rLimit)
}
func getSockaddrByName(name string) syscall.Sockaddr {
ief, err := net.InterfaceByName(name)
if err != nil {
return nil
}
addrs, err := ief.Addrs()
if err != nil {
return nil
}
for _, addr := range addrs {
ipNet, ok := addr.(*net.IPNet)
if !ok {
continue
}
if ipBytes := ipNet.IP.To4(); ipBytes != nil {
var sa4 syscall.SockaddrInet4
copy(sa4.Addr[:], ipBytes)
return &sa4
} else if ipBytes := ipNet.IP.To16(); ipBytes != nil {
var sa16 syscall.SockaddrInet6
copy(sa16.Addr[:], ipBytes)
sa16.ZoneId = uint32(ief.Index)
return &sa16
}
}
return nil
}
func BindToInterface(name string) func(network, address string, conn syscall.RawConn) error {
return func(network, address string, conn syscall.RawConn) error {
sockAddr := getSockaddrByName(name)
if sockAddr == nil {
return nil
}
var operr error
if err := conn.Control(func(fd uintptr) {
operr = syscall.Bind(int(fd), sockAddr)
}); err != nil {
return err
}
return operr
}
}