net.go

package pgo

import (
	"encoding/binary"
	"errors"
	"net"
)

// IP2long converts a string containing an (IPv4) Internet Protocol dotted address into a long integer
func IP2long(ipAddr string) (uint32, error) {
	ip := net.ParseIP(ipAddr)
	if ip == nil {
		return 0, errors.New("wrong ipAddr format")
	}
	ip = ip.To4()
	return binary.BigEndian.Uint32(ip), nil
}

// Long2ip converts an long integer address into a string in (IPv4) Internet standard dotted format
func Long2ip(ipLong uint32) string {
	ipByte := make([]byte, 4)
	binary.BigEndian.PutUint32(ipByte, ipLong)
	ip := net.IP(ipByte)
	return ip.String()
}

// GetMxrr Get MX records corresponding to a given Internet host name
// Returns TRUE if any records are found; returns FALSE if no records were found or if an error occurred
func GetMxrr(domain string) (isMx bool, mxs []*net.MX, err error) {
	mxs, err = net.LookupMX(domain)
	if err != nil {
		return
	}
	if len(mxs) > 0 {
		isMx = true
	}
	return
}