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 }
123