20 func (r *Range) String() string {
21 return fmt.Sprintf("%s-%s (%s)", r.First, r.Last, r.Description)
24 // Create a new IP list. The given ranges must already sorted by the lower
25 // bound IP in each range. Behaviour is undefined for lists of overlapping
27 func New(initSorted []Range) *IPList {
33 func (me *IPList) NumRanges() int {
40 // Return the range the given IP is in. Returns nil if no range is found.
41 func (me *IPList) Lookup(ip net.IP) (r *Range) {
45 // TODO: Perhaps all addresses should be converted to IPv6, if the future
46 // of IP is to always be backwards compatible. But this will cost 4x the
47 // memory for IPv4 addresses?
59 if v4 == nil && v6 == nil {
61 Description: fmt.Sprintf("unsupported IP: %s", ip),
67 // Return the range the given IP is in. Returns nil if no range is found.
68 func (me *IPList) lookup(ip net.IP) (r *Range) {
69 // Find the index of the first range for which the following range exceeds
71 i := sort.Search(len(me.ranges), func(i int) bool {
72 if i+1 >= len(me.ranges) {
75 return bytes.Compare(ip, me.ranges[i+1].First) < 0
77 if i == len(me.ranges) {
81 if bytes.Compare(ip, r.First) < 0 || bytes.Compare(ip, r.Last) > 0 {
87 func minifyIP(ip *net.IP) {
90 *ip = append(make([]byte, 0, 4), v4...)
94 // Parse a line of the PeerGuardian Text Lists (P2P) Format. Returns !ok but
95 // no error if a line doesn't contain a range but isn't erroneous, such as
96 // comment and blank lines.
97 func ParseBlocklistP2PLine(l []byte) (r Range, ok bool, err error) {
98 l = bytes.TrimSpace(l)
99 if len(l) == 0 || bytes.HasPrefix(l, []byte("#")) {
102 // TODO: Check this when IPv6 blocklists are available.
103 colon := bytes.LastIndexAny(l, ":")
105 err = errors.New("missing colon")
108 hyphen := bytes.IndexByte(l[colon+1:], '-')
110 err = errors.New("missing hyphen")
114 r.Description = string(l[:colon])
115 r.First = net.ParseIP(string(l[colon+1 : hyphen]))
117 r.Last = net.ParseIP(string(l[hyphen+1:]))
119 if r.First == nil || r.Last == nil || len(r.First) != len(r.Last) {
120 err = errors.New("bad IP range")