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ipmask.go (4052B)

      1 package pflag
      2 
      3 import (
      4 	"fmt"
      5 	"net"
      6 	"strconv"
      7 )
      8 
      9 // -- net.IPMask value
     10 type ipMaskValue net.IPMask
     11 
     12 func newIPMaskValue(val net.IPMask, p *net.IPMask) *ipMaskValue {
     13 	*p = val
     14 	return (*ipMaskValue)(p)
     15 }
     16 
     17 func (i *ipMaskValue) String() string { return net.IPMask(*i).String() }
     18 func (i *ipMaskValue) Set(s string) error {
     19 	ip := ParseIPv4Mask(s)
     20 	if ip == nil {
     21 		return fmt.Errorf("failed to parse IP mask: %q", s)
     22 	}
     23 	*i = ipMaskValue(ip)
     24 	return nil
     25 }
     26 
     27 func (i *ipMaskValue) Type() string {
     28 	return "ipMask"
     29 }
     30 
     31 // ParseIPv4Mask written in IP form (e.g. 255.255.255.0).
     32 // This function should really belong to the net package.
     33 func ParseIPv4Mask(s string) net.IPMask {
     34 	mask := net.ParseIP(s)
     35 	if mask == nil {
     36 		if len(s) != 8 {
     37 			return nil
     38 		}
     39 		// net.IPMask.String() actually outputs things like ffffff00
     40 		// so write a horrible parser for that as well  :-(
     41 		m := []int{}
     42 		for i := 0; i < 4; i++ {
     43 			b := "0x" + s[2*i:2*i+2]
     44 			d, err := strconv.ParseInt(b, 0, 0)
     45 			if err != nil {
     46 				return nil
     47 			}
     48 			m = append(m, int(d))
     49 		}
     50 		s := fmt.Sprintf("%d.%d.%d.%d", m[0], m[1], m[2], m[3])
     51 		mask = net.ParseIP(s)
     52 		if mask == nil {
     53 			return nil
     54 		}
     55 	}
     56 	return net.IPv4Mask(mask[12], mask[13], mask[14], mask[15])
     57 }
     58 
     59 func parseIPv4Mask(sval string) (interface{}, error) {
     60 	mask := ParseIPv4Mask(sval)
     61 	if mask == nil {
     62 		return nil, fmt.Errorf("unable to parse %s as net.IPMask", sval)
     63 	}
     64 	return mask, nil
     65 }
     66 
     67 // GetIPv4Mask return the net.IPv4Mask value of a flag with the given name
     68 func (f *FlagSet) GetIPv4Mask(name string) (net.IPMask, error) {
     69 	val, err := f.getFlagType(name, "ipMask", parseIPv4Mask)
     70 	if err != nil {
     71 		return nil, err
     72 	}
     73 	return val.(net.IPMask), nil
     74 }
     75 
     76 // IPMaskVar defines an net.IPMask flag with specified name, default value, and usage string.
     77 // The argument p points to an net.IPMask variable in which to store the value of the flag.
     78 func (f *FlagSet) IPMaskVar(p *net.IPMask, name string, value net.IPMask, usage string) {
     79 	f.VarP(newIPMaskValue(value, p), name, "", usage)
     80 }
     81 
     82 // IPMaskVarP is like IPMaskVar, but accepts a shorthand letter that can be used after a single dash.
     83 func (f *FlagSet) IPMaskVarP(p *net.IPMask, name, shorthand string, value net.IPMask, usage string) {
     84 	f.VarP(newIPMaskValue(value, p), name, shorthand, usage)
     85 }
     86 
     87 // IPMaskVar defines an net.IPMask flag with specified name, default value, and usage string.
     88 // The argument p points to an net.IPMask variable in which to store the value of the flag.
     89 func IPMaskVar(p *net.IPMask, name string, value net.IPMask, usage string) {
     90 	CommandLine.VarP(newIPMaskValue(value, p), name, "", usage)
     91 }
     92 
     93 // IPMaskVarP is like IPMaskVar, but accepts a shorthand letter that can be used after a single dash.
     94 func IPMaskVarP(p *net.IPMask, name, shorthand string, value net.IPMask, usage string) {
     95 	CommandLine.VarP(newIPMaskValue(value, p), name, shorthand, usage)
     96 }
     97 
     98 // IPMask defines an net.IPMask flag with specified name, default value, and usage string.
     99 // The return value is the address of an net.IPMask variable that stores the value of the flag.
    100 func (f *FlagSet) IPMask(name string, value net.IPMask, usage string) *net.IPMask {
    101 	p := new(net.IPMask)
    102 	f.IPMaskVarP(p, name, "", value, usage)
    103 	return p
    104 }
    105 
    106 // IPMaskP is like IPMask, but accepts a shorthand letter that can be used after a single dash.
    107 func (f *FlagSet) IPMaskP(name, shorthand string, value net.IPMask, usage string) *net.IPMask {
    108 	p := new(net.IPMask)
    109 	f.IPMaskVarP(p, name, shorthand, value, usage)
    110 	return p
    111 }
    112 
    113 // IPMask defines an net.IPMask flag with specified name, default value, and usage string.
    114 // The return value is the address of an net.IPMask variable that stores the value of the flag.
    115 func IPMask(name string, value net.IPMask, usage string) *net.IPMask {
    116 	return CommandLine.IPMaskP(name, "", value, usage)
    117 }
    118 
    119 // IPMaskP is like IP, but accepts a shorthand letter that can be used after a single dash.
    120 func IPMaskP(name, shorthand string, value net.IPMask, usage string) *net.IPMask {
    121 	return CommandLine.IPMaskP(name, shorthand, value, usage)
    122 }