bitbucket.org/Aishee/synsec@v0.0.0-20210414005726-236fc01a153d/pkg/types/ip.go (about)

     1  package types
     2  
     3  import (
     4  	"encoding/binary"
     5  	"fmt"
     6  	"math"
     7  	"net"
     8  	"strings"
     9  
    10  	"github.com/pkg/errors"
    11  )
    12  
    13  func LastAddress(n net.IPNet) net.IP {
    14  	ip := n.IP.To4()
    15  	if ip == nil {
    16  		ip = n.IP
    17  		return net.IP{
    18  			ip[0] | ^n.Mask[0], ip[1] | ^n.Mask[1], ip[2] | ^n.Mask[2],
    19  			ip[3] | ^n.Mask[3], ip[4] | ^n.Mask[4], ip[5] | ^n.Mask[5],
    20  			ip[6] | ^n.Mask[6], ip[7] | ^n.Mask[7], ip[8] | ^n.Mask[8],
    21  			ip[9] | ^n.Mask[9], ip[10] | ^n.Mask[10], ip[11] | ^n.Mask[11],
    22  			ip[12] | ^n.Mask[12], ip[13] | ^n.Mask[13], ip[14] | ^n.Mask[14],
    23  			ip[15] | ^n.Mask[15]}
    24  	}
    25  
    26  	return net.IPv4(
    27  		ip[0]|^n.Mask[0],
    28  		ip[1]|^n.Mask[1],
    29  		ip[2]|^n.Mask[2],
    30  		ip[3]|^n.Mask[3])
    31  }
    32  
    33  /*returns a range for any ip or range*/
    34  func Addr2Ints(any string) (int, int64, int64, int64, int64, error) {
    35  	if strings.Contains(any, "/") {
    36  		_, net, err := net.ParseCIDR(any)
    37  		if err != nil {
    38  			return -1, 0, 0, 0, 0, errors.Wrapf(err, "while parsing range %s", any)
    39  		}
    40  		return Range2Ints(*net)
    41  	} else {
    42  		ip := net.ParseIP(any)
    43  		if ip == nil {
    44  			return -1, 0, 0, 0, 0, fmt.Errorf("invalid address")
    45  		}
    46  		sz, start, end, err := IP2Ints(ip)
    47  		if err != nil {
    48  			return -1, 0, 0, 0, 0, errors.Wrapf(err, "while parsing ip %s", any)
    49  		}
    50  		return sz, start, end, start, end, nil
    51  	}
    52  }
    53  
    54  /*size (16|4), nw_start, suffix_start, nw_end, suffix_end, error*/
    55  func Range2Ints(network net.IPNet) (int, int64, int64, int64, int64, error) {
    56  
    57  	szStart, nwStart, sfxStart, err := IP2Ints(network.IP)
    58  	if err != nil {
    59  		return -1, 0, 0, 0, 0, errors.Wrap(err, "converting first ip in range")
    60  	}
    61  	lastAddr := LastAddress(network)
    62  	szEnd, nwEnd, sfxEnd, err := IP2Ints(lastAddr)
    63  	if err != nil {
    64  		return -1, 0, 0, 0, 0, errors.Wrap(err, "transforming last address of range")
    65  	}
    66  	if szEnd != szStart {
    67  		return -1, 0, 0, 0, 0, fmt.Errorf("inconsistent size for range first(%d) and last(%d) ip", szStart, szEnd)
    68  	}
    69  	return szStart, nwStart, sfxStart, nwEnd, sfxEnd, nil
    70  }
    71  
    72  func uint2int(u uint64) int64 {
    73  	var ret int64
    74  	if u == math.MaxInt64 {
    75  		ret = 0
    76  	} else if u == math.MaxUint64 {
    77  		ret = math.MaxInt64
    78  	} else if u > math.MaxInt64 {
    79  		u -= math.MaxInt64
    80  		ret = int64(u)
    81  	} else {
    82  		ret = int64(u)
    83  		ret -= math.MaxInt64
    84  	}
    85  	return ret
    86  }
    87  
    88  /*size (16|4), network, suffix, error*/
    89  func IP2Ints(pip net.IP) (int, int64, int64, error) {
    90  	var ip_nw, ip_sfx uint64
    91  
    92  	pip4 := pip.To4()
    93  	pip16 := pip.To16()
    94  
    95  	if pip4 != nil {
    96  		ip_nw32 := binary.BigEndian.Uint32(pip4)
    97  
    98  		return 4, uint2int(uint64(ip_nw32)), uint2int(ip_sfx), nil
    99  	} else if pip16 != nil {
   100  		ip_nw = binary.BigEndian.Uint64(pip16[0:8])
   101  		ip_sfx = binary.BigEndian.Uint64(pip16[8:16])
   102  		return 16, uint2int(ip_nw), uint2int(ip_sfx), nil
   103  	} else {
   104  		return -1, 0, 0, fmt.Errorf("unexpected len %d for %s", len(pip), pip)
   105  	}
   106  }