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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef NET_BASE_DNS_UTIL_H_
6 #define NET_BASE_DNS_UTIL_H_
7 #pragma once
8 
9 #include <string>
10 
11 #include "base/basictypes.h"
12 
13 namespace net {
14 
15 // DNSDomainFromDot - convert a domain string to DNS format. From DJB's
16 // public domain DNS library.
17 //
18 //   dotted: a string in dotted form: "www.google.com"
19 //   out: a result in DNS form: "\x03www\x06google\x03com\x00"
20 bool DNSDomainFromDot(const std::string& dotted, std::string* out);
21 
22 // DNSDomainToString coverts a domain in DNS format to a dotted string.
23 std::string DNSDomainToString(const std::string& domain);
24 
25 // Returns true iff the given character is in the set of valid DNS label
26 // characters as given in RFC 3490, 4.1, 3(a)
27 bool IsSTD3ASCIIValidCharacter(char c);
28 
29 // Returns the hostname by trimming the ending dot, if one exists.
30 std::string TrimEndingDot(const std::string& host);
31 
32 // DNS resource record types. See
33 // http://www.iana.org/assignments/dns-parameters
34 // WARNING: if you're adding any new values here you may need to add them to
35 // dnsrr_resolver.cc:DnsRRIsParsedByWindows.
36 
37 static const uint16 kDNS_CNAME = 5;
38 static const uint16 kDNS_TXT = 16;
39 static const uint16 kDNS_CERT = 37;
40 static const uint16 kDNS_DS = 43;
41 static const uint16 kDNS_RRSIG = 46;
42 static const uint16 kDNS_DNSKEY = 48;
43 static const uint16 kDNS_ANY = 0xff;
44 static const uint16 kDNS_CAA = 13172;  // temporary, not IANA
45 static const uint16 kDNS_TESTING = 0xfffe;  // in private use area.
46 
47 // http://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml
48 static const uint8 kDNSSEC_RSA_SHA1 = 5;
49 static const uint8 kDNSSEC_RSA_SHA1_NSEC3 = 7;
50 static const uint8 kDNSSEC_RSA_SHA256 = 8;
51 
52 // RFC 4509
53 static const uint8 kDNSSEC_SHA1 = 1;
54 static const uint8 kDNSSEC_SHA256 = 2;
55 
56 }  // namespace net
57 
58 #endif  // NET_BASE_DNS_UTIL_H_
59