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package iputils
import (
"encoding/binary"
"fmt"
"math"
"net"
)
func AddIPInt(ip net.IP, i int) (net.IP, error) {
ip = ip.To4()
if ip == nil {
return nil, fmt.Errorf("expected IPv4 address, got %s", ip.String())
}
ui32 := binary.BigEndian.Uint32(ip)
resInt64 := int64(ui32) + int64(i)
if resInt64 > int64(math.MaxUint32) {
return nil, fmt.Errorf("%s + %d overflows", ip.String(), i)
}
res := make(net.IP, 4)
binary.BigEndian.PutUint32(res, uint32(resInt64))
return res, nil
}
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