113 lines
2.4 KiB
Go
113 lines
2.4 KiB
Go
package radius
|
|
|
|
import (
|
|
"errors"
|
|
)
|
|
|
|
// Type is the RADIUS attribute type.
|
|
type Type int
|
|
|
|
// TypeInvalid is a Type that can be used to represent an invalid RADIUS
|
|
// attribute type.
|
|
const TypeInvalid Type = -1
|
|
|
|
// Attributes is a map of RADIUS attribute types to slice of Attributes.
|
|
type Attributes map[Type][]Attribute
|
|
|
|
// ParseAttributes parses the wire-encoded RADIUS attributes and returns a new
|
|
// Attributes value. An error is returned if the buffer is malformed.
|
|
func ParseAttributes(b []byte) (Attributes, error) {
|
|
attrs := make(map[Type][]Attribute)
|
|
|
|
for len(b) > 0 {
|
|
if len(b) < 2 {
|
|
return nil, errors.New("short buffer")
|
|
}
|
|
length := int(b[1])
|
|
if length > len(b) || length > 253 {
|
|
return nil, errors.New("invalid attribute length")
|
|
}
|
|
|
|
typ := Type(b[0])
|
|
var value Attribute
|
|
if length > 2 {
|
|
value = make(Attribute, length-2)
|
|
copy(value, b[2:])
|
|
}
|
|
attrs[typ] = append(attrs[typ], value)
|
|
|
|
b = b[length:]
|
|
}
|
|
|
|
return attrs, nil
|
|
}
|
|
|
|
// Add appends the given Attribute to the map entry of the given type.
|
|
func (a Attributes) Add(key Type, value Attribute) {
|
|
a[key] = append(a[key], value)
|
|
}
|
|
|
|
// Del removes all Attributes of the given type from a.
|
|
func (a Attributes) Del(key Type) {
|
|
delete(a, key)
|
|
}
|
|
|
|
// Get returns the first Attribute of Type key. nil is returned if no Attribute
|
|
// of Type key exists in a.
|
|
func (a Attributes) Get(key Type) Attribute {
|
|
attr, _ := a.Lookup(key)
|
|
return attr
|
|
}
|
|
|
|
// Lookup returns the first Attribute of Type key. nil and false is returned if
|
|
// no Attribute of Type key exists in a.
|
|
func (a Attributes) Lookup(key Type) (Attribute, bool) {
|
|
m := a[key]
|
|
if len(m) == 0 {
|
|
return nil, false
|
|
}
|
|
return m[0], true
|
|
}
|
|
|
|
// Set removes all Attributes of Type key and appends value.
|
|
func (a Attributes) Set(key Type, value Attribute) {
|
|
a[key] = []Attribute{value}
|
|
}
|
|
|
|
// Len returns the total number of Attributes in a.
|
|
func (a Attributes) Len() int {
|
|
var i int
|
|
for _, s := range a {
|
|
i += len(s)
|
|
}
|
|
return i
|
|
}
|
|
|
|
func (a Attributes) encodeTo(b []byte) {
|
|
for typ, attrs := range a {
|
|
if typ < 0 || typ > 255 {
|
|
continue
|
|
}
|
|
for _, attr := range attrs {
|
|
size := 2 + len(attr)
|
|
b[0] = byte(typ)
|
|
b[1] = byte(size)
|
|
copy(b[2:], attr)
|
|
b = b[size:]
|
|
}
|
|
}
|
|
}
|
|
|
|
func (a Attributes) wireSize() (bytes int) {
|
|
for typ, attrs := range a {
|
|
if typ < 0 || typ > 255 {
|
|
continue
|
|
}
|
|
for _, attr := range attrs {
|
|
// type field + length field + value field
|
|
bytes += 1 + 1 + len(attr)
|
|
}
|
|
}
|
|
return
|
|
}
|