ipmask.go

Documentation: github.com/spf13/pflag

     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
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