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package types
import (
"encoding/binary"
"fmt"
"math"
"net"
"strings"
"github.com/pkg/errors"
)
func LastAddress(n net.IPNet) net.IP {
ip := n.IP.To4()
if ip == nil {
ip = n.IP
return net.IP{
ip[0] | ^n.Mask[0], ip[1] | ^n.Mask[1], ip[2] | ^n.Mask[2],
ip[3] | ^n.Mask[3], ip[4] | ^n.Mask[4], ip[5] | ^n.Mask[5],
ip[6] | ^n.Mask[6], ip[7] | ^n.Mask[7], ip[8] | ^n.Mask[8],
ip[9] | ^n.Mask[9], ip[10] | ^n.Mask[10], ip[11] | ^n.Mask[11],
ip[12] | ^n.Mask[12], ip[13] | ^n.Mask[13], ip[14] | ^n.Mask[14],
ip[15] | ^n.Mask[15]}
}
return net.IPv4(
ip[0]|^n.Mask[0],
ip[1]|^n.Mask[1],
ip[2]|^n.Mask[2],
ip[3]|^n.Mask[3])
}
/*returns a range for any ip or range*/
func Addr2Ints(anyIP string) (int, int64, int64, int64, int64, error) {
if strings.Contains(anyIP, "/") {
_, net, err := net.ParseCIDR(anyIP)
if err != nil {
return -1, 0, 0, 0, 0, errors.Wrapf(err, "while parsing range %s", anyIP)
}
return Range2Ints(*net)
}
ip := net.ParseIP(anyIP)
if ip == nil {
return -1, 0, 0, 0, 0, fmt.Errorf("invalid address")
}
sz, start, end, err := IP2Ints(ip)
if err != nil {
return -1, 0, 0, 0, 0, errors.Wrapf(err, "while parsing ip %s", anyIP)
}
return sz, start, end, start, end, nil
}
/*size (16|4), nw_start, suffix_start, nw_end, suffix_end, error*/
func Range2Ints(network net.IPNet) (int, int64, int64, int64, int64, error) {
szStart, nwStart, sfxStart, err := IP2Ints(network.IP)
if err != nil {
return -1, 0, 0, 0, 0, errors.Wrap(err, "converting first ip in range")
}
lastAddr := LastAddress(network)
szEnd, nwEnd, sfxEnd, err := IP2Ints(lastAddr)
if err != nil {
return -1, 0, 0, 0, 0, errors.Wrap(err, "transforming last address of range")
}
if szEnd != szStart {
return -1, 0, 0, 0, 0, fmt.Errorf("inconsistent size for range first(%d) and last(%d) ip", szStart, szEnd)
}
return szStart, nwStart, sfxStart, nwEnd, sfxEnd, nil
}
func uint2int(u uint64) int64 {
var ret int64
if u == math.MaxInt64 {
ret = 0
} else if u == math.MaxUint64 {
ret = math.MaxInt64
} else if u > math.MaxInt64 {
u -= math.MaxInt64
ret = int64(u)
} else {
ret = int64(u)
ret -= math.MaxInt64
}
return ret
}
/*size (16|4), network, suffix, error*/
func IP2Ints(pip net.IP) (int, int64, int64, error) {
var ip_nw, ip_sfx uint64
pip4 := pip.To4()
pip16 := pip.To16()
if pip4 != nil {
ip_nw32 := binary.BigEndian.Uint32(pip4)
return 4, uint2int(uint64(ip_nw32)), uint2int(ip_sfx), nil
} else if pip16 != nil {
ip_nw = binary.BigEndian.Uint64(pip16[0:8])
ip_sfx = binary.BigEndian.Uint64(pip16[8:16])
return 16, uint2int(ip_nw), uint2int(ip_sfx), nil
} else {
return -1, 0, 0, fmt.Errorf("unexpected len %d for %s", len(pip), pip)
}
}
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