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package sockaddr
import "bytes"
type IPAddrs []IPAddr
func (s IPAddrs) Len() int { return len(s) }
func (s IPAddrs) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
// // SortIPAddrsByCmp is a type that satisfies sort.Interface and can be used
// // by the routines in this package. The SortIPAddrsByCmp type is used to
// // sort IPAddrs by Cmp()
// type SortIPAddrsByCmp struct{ IPAddrs }
// // Less reports whether the element with index i should sort before the
// // element with index j.
// func (s SortIPAddrsByCmp) Less(i, j int) bool {
// // Sort by Type, then address, then port number.
// return Less(s.IPAddrs[i], s.IPAddrs[j])
// }
// SortIPAddrsBySpecificMaskLen is a type that satisfies sort.Interface and
// can be used by the routines in this package. The
// SortIPAddrsBySpecificMaskLen type is used to sort IPAddrs by smallest
// network (most specific to largest network).
type SortIPAddrsByNetworkSize struct{ IPAddrs }
// Less reports whether the element with index i should sort before the
// element with index j.
func (s SortIPAddrsByNetworkSize) Less(i, j int) bool {
// Sort masks with a larger binary value (i.e. fewer hosts per network
// prefix) after masks with a smaller value (larger number of hosts per
// prefix).
switch bytes.Compare([]byte(*s.IPAddrs[i].NetIPMask()), []byte(*s.IPAddrs[j].NetIPMask())) {
case 0:
// Fall through to the second test if the net.IPMasks are the
// same.
break
case 1:
return true
case -1:
return false
default:
panic("bad, m'kay?")
}
// Sort IPs based on the length (i.e. prefer IPv4 over IPv6).
iLen := len(*s.IPAddrs[i].NetIP())
jLen := len(*s.IPAddrs[j].NetIP())
if iLen != jLen {
return iLen > jLen
}
// Sort IPs based on their network address from lowest to highest.
switch bytes.Compare(s.IPAddrs[i].NetIPNet().IP, s.IPAddrs[j].NetIPNet().IP) {
case 0:
break
case 1:
return false
case -1:
return true
default:
panic("lol wut?")
}
// If a host does not have a port set, it always sorts after hosts
// that have a port (e.g. a host with a /32 and port number is more
// specific and should sort first over a host with a /32 but no port
// set).
if s.IPAddrs[i].IPPort() == 0 || s.IPAddrs[j].IPPort() == 0 {
return false
}
return s.IPAddrs[i].IPPort() < s.IPAddrs[j].IPPort()
}
// SortIPAddrsBySpecificMaskLen is a type that satisfies sort.Interface and
// can be used by the routines in this package. The
// SortIPAddrsBySpecificMaskLen type is used to sort IPAddrs by smallest
// network (most specific to largest network).
type SortIPAddrsBySpecificMaskLen struct{ IPAddrs }
// Less reports whether the element with index i should sort before the
// element with index j.
func (s SortIPAddrsBySpecificMaskLen) Less(i, j int) bool {
return s.IPAddrs[i].Maskbits() > s.IPAddrs[j].Maskbits()
}
// SortIPAddrsByBroadMaskLen is a type that satisfies sort.Interface and can
// be used by the routines in this package. The SortIPAddrsByBroadMaskLen
// type is used to sort IPAddrs by largest network (i.e. largest subnets
// first).
type SortIPAddrsByBroadMaskLen struct{ IPAddrs }
// Less reports whether the element with index i should sort before the
// element with index j.
func (s SortIPAddrsByBroadMaskLen) Less(i, j int) bool {
return s.IPAddrs[i].Maskbits() < s.IPAddrs[j].Maskbits()
}