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Code Editor : dnsclient.go
// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package net import ( "math/rand" "sort" "golang.org/x/net/dns/dnsmessage" ) // reverseaddr returns the in-addr.arpa. or ip6.arpa. hostname of the IP // address addr suitable for rDNS (PTR) record lookup or an error if it fails // to parse the IP address. func reverseaddr(addr string) (arpa string, err error) { ip := ParseIP(addr) if ip == nil { return "", &DNSError{Err: "unrecognized address", Name: addr} } if ip.To4() != nil { return uitoa(uint(ip[15])) + "." + uitoa(uint(ip[14])) + "." + uitoa(uint(ip[13])) + "." + uitoa(uint(ip[12])) + ".in-addr.arpa.", nil } // Must be IPv6 buf := make([]byte, 0, len(ip)*4+len("ip6.arpa.")) // Add it, in reverse, to the buffer for i := len(ip) - 1; i >= 0; i-- { v := ip[i] buf = append(buf, hexDigit[v&0xF], '.', hexDigit[v>>4], '.') } // Append "ip6.arpa." and return (buf already has the final .) buf = append(buf, "ip6.arpa."...) return string(buf), nil } func equalASCIIName(x, y dnsmessage.Name) bool { if x.Length != y.Length { return false } for i := 0; i < int(x.Length); i++ { a := x.Data[i] b := y.Data[i] if 'A' <= a && a <= 'Z' { a += 0x20 } if 'A' <= b && b <= 'Z' { b += 0x20 } if a != b { return false } } return true } // isDomainName checks if a string is a presentation-format domain name // (currently restricted to hostname-compatible "preferred name" LDH labels and // SRV-like "underscore labels"; see golang.org/issue/12421). func isDomainName(s string) bool { // See RFC 1035, RFC 3696. // Presentation format has dots before every label except the first, and the // terminal empty label is optional here because we assume fully-qualified // (absolute) input. We must therefore reserve space for the first and last // labels' length octets in wire format, where they are necessary and the // maximum total length is 255. // So our _effective_ maximum is 253, but 254 is not rejected if the last // character is a dot. l := len(s) if l == 0 || l > 254 || l == 254 && s[l-1] != '.' { return false } last := byte('.') nonNumeric := false // true once we've seen a letter or hyphen partlen := 0 for i := 0; i < len(s); i++ { c := s[i] switch { default: return false case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_': nonNumeric = true partlen++ case '0' <= c && c <= '9': // fine partlen++ case c == '-': // Byte before dash cannot be dot. if last == '.' { return false } partlen++ nonNumeric = true case c == '.': // Byte before dot cannot be dot, dash. if last == '.' || last == '-' { return false } if partlen > 63 || partlen == 0 { return false } partlen = 0 } last = c } if last == '-' || partlen > 63 { return false } return nonNumeric } // absDomainName returns an absolute domain name which ends with a // trailing dot to match pure Go reverse resolver and all other lookup // routines. // See golang.org/issue/12189. // But we don't want to add dots for local names from /etc/hosts. // It's hard to tell so we settle on the heuristic that names without dots // (like "localhost" or "myhost") do not get trailing dots, but any other // names do. func absDomainName(b []byte) string { hasDots := false for _, x := range b { if x == '.' { hasDots = true break } } if hasDots && b[len(b)-1] != '.' { b = append(b, '.') } return string(b) } // An SRV represents a single DNS SRV record. type SRV struct { Target string Port uint16 Priority uint16 Weight uint16 } // byPriorityWeight sorts SRV records by ascending priority and weight. type byPriorityWeight []*SRV func (s byPriorityWeight) Len() int { return len(s) } func (s byPriorityWeight) Less(i, j int) bool { return s[i].Priority < s[j].Priority || (s[i].Priority == s[j].Priority && s[i].Weight < s[j].Weight) } func (s byPriorityWeight) Swap(i, j int) { s[i], s[j] = s[j], s[i] } // shuffleByWeight shuffles SRV records by weight using the algorithm // described in RFC 2782. func (addrs byPriorityWeight) shuffleByWeight() { sum := 0 for _, addr := range addrs { sum += int(addr.Weight) } for sum > 0 && len(addrs) > 1 { s := 0 n := rand.Intn(sum) for i := range addrs { s += int(addrs[i].Weight) if s > n { if i > 0 { addrs[0], addrs[i] = addrs[i], addrs[0] } break } } sum -= int(addrs[0].Weight) addrs = addrs[1:] } } // sort reorders SRV records as specified in RFC 2782. func (addrs byPriorityWeight) sort() { sort.Sort(addrs) i := 0 for j := 1; j < len(addrs); j++ { if addrs[i].Priority != addrs[j].Priority { addrs[i:j].shuffleByWeight() i = j } } addrs[i:].shuffleByWeight() } // An MX represents a single DNS MX record. type MX struct { Host string Pref uint16 } // byPref implements sort.Interface to sort MX records by preference type byPref []*MX func (s byPref) Len() int { return len(s) } func (s byPref) Less(i, j int) bool { return s[i].Pref < s[j].Pref } func (s byPref) Swap(i, j int) { s[i], s[j] = s[j], s[i] } // sort reorders MX records as specified in RFC 5321. func (s byPref) sort() { for i := range s { j := rand.Intn(i + 1) s[i], s[j] = s[j], s[i] } sort.Sort(s) } // An NS represents a single DNS NS record. type NS struct { Host string }
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