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