1package pflag
2
3import (
4	"fmt"
5	"net"
6	"strconv"
7)
8
9// -- net.IPMask value
10type ipMaskValue net.IPMask
11
12func newIPMaskValue(val net.IPMask, p *net.IPMask) *ipMaskValue {
13	*p = val
14	return (*ipMaskValue)(p)
15}
16
17func (i *ipMaskValue) String() string { return net.IPMask(*i).String() }
18func (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
27func (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.
33func 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
59func 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
68func (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.
78func (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.
83func (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.
89func 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.
94func 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.
100func (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.
107func (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.
115func 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.
120func IPMaskP(name, shorthand string, value net.IPMask, usage string) *net.IPMask {
121	return CommandLine.IPMaskP(name, shorthand, value, usage)
122}
123