dns_util.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
1// Copyright (c) 2012 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
8#include <string>
9
10#include "base/basictypes.h"
11#include "base/string_piece.h"
12#include "net/base/net_export.h"
13
14namespace net {
15
16// DNSDomainFromDot - convert a domain string to DNS format. From DJB's
17// public domain DNS library.
18//
19//   dotted: a string in dotted form: "www.google.com"
20//   out: a result in DNS form: "\x03www\x06google\x03com\x00"
21NET_EXPORT_PRIVATE bool DNSDomainFromDot(const base::StringPiece& dotted,
22                                         std::string* out);
23
24// DNSDomainToString converts a domain in DNS format to a dotted string.
25// Excludes the dot at the end.
26NET_EXPORT_PRIVATE std::string DNSDomainToString(
27    const base::StringPiece& domain);
28
29// Returns true iff the given character is in the set of valid DNS label
30// characters as given in RFC 3490, 4.1, 3(a)
31NET_EXPORT_PRIVATE bool IsSTD3ASCIIValidCharacter(char c);
32
33// Returns the hostname by trimming the ending dot, if one exists.
34NET_EXPORT std::string TrimEndingDot(const base::StringPiece& host);
35
36}  // namespace net
37
38#endif  // NET_BASE_DNS_UTIL_H_
39