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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "net/dns/dns_util.h" | 5 #include "net/dns/dns_util.h" |
6 | 6 |
7 #include <errno.h> | 7 #include <errno.h> |
8 #include <limits.h> | 8 #include <limits.h> |
9 | 9 |
10 #include <cstring> | 10 #include <cstring> |
11 | 11 |
12 #include "base/metrics/field_trial.h" | 12 #include "base/metrics/field_trial.h" |
13 #include "base/metrics/histogram_macros.h" | |
13 #include "base/strings/string_number_conversions.h" | 14 #include "base/strings/string_number_conversions.h" |
14 #include "base/strings/string_split.h" | 15 #include "base/strings/string_split.h" |
15 #include "build/build_config.h" | 16 #include "build/build_config.h" |
16 #include "net/base/address_list.h" | 17 #include "net/base/address_list.h" |
17 | 18 |
19 #if defined(OS_POSIX) | |
20 #include <netinet/in.h> | |
21 #if !defined(OS_NACL) | |
22 #include <net/if.h> | |
23 #if !defined(OS_ANDROID) | |
24 #include <ifaddrs.h> | |
25 #endif // !defined(OS_ANDROID) | |
26 #endif // !defined(OS_NACL) | |
27 #endif // defined(OS_POSIX) | |
28 | |
29 #if defined(OS_ANDROID) | |
30 #include "net/android/network_library.h" | |
31 #endif | |
32 | |
18 namespace net { | 33 namespace net { |
19 | 34 |
20 // Based on DJB's public domain code. | 35 // Based on DJB's public domain code. |
21 bool DNSDomainFromDot(const base::StringPiece& dotted, std::string* out) { | 36 bool DNSDomainFromDot(const base::StringPiece& dotted, std::string* out) { |
22 const char* buf = dotted.data(); | 37 const char* buf = dotted.data(); |
23 unsigned n = dotted.size(); | 38 size_t n = dotted.size(); |
24 char label[63]; | 39 char label[63]; |
25 size_t labellen = 0; /* <= sizeof label */ | 40 size_t labellen = 0; /* <= sizeof label */ |
26 char name[255]; | 41 char name[255]; |
27 size_t namelen = 0; /* <= sizeof name */ | 42 size_t namelen = 0; /* <= sizeof name */ |
28 char ch; | 43 char ch; |
44 bool valid_name = true; | |
29 | 45 |
30 for (;;) { | 46 for (;;) { |
31 if (!n) | 47 if (!n) |
32 break; | 48 break; |
33 ch = *buf++; | 49 ch = *buf++; |
34 --n; | 50 --n; |
35 if (ch == '.') { | 51 if (ch == '.') { |
36 // Don't allow empty labels per http://crbug.com/456391. | 52 // Don't allow empty labels per http://crbug.com/456391. |
37 if (!labellen) | 53 if (!labellen) |
38 return false; | 54 return false; |
39 if (namelen + labellen + 1 > sizeof name) | 55 if (namelen + labellen + 1 > sizeof name) |
40 return false; | 56 return false; |
41 name[namelen++] = static_cast<char>(labellen); | 57 name[namelen++] = static_cast<char>(labellen); |
42 memcpy(name + namelen, label, labellen); | 58 memcpy(name + namelen, label, labellen); |
43 namelen += labellen; | 59 namelen += labellen; |
44 labellen = 0; | 60 labellen = 0; |
45 continue; | 61 continue; |
46 } | 62 } |
47 if (labellen >= sizeof label) | 63 if (labellen >= sizeof label) |
48 return false; | 64 return false; |
65 if (!IsValidHostLabelCharacter(ch, labellen == 0)) { | |
66 // TODO(palmer): In the future, when we can remove support for invalid | |
67 // names, return false here instead (and remove the UMA counter). | |
68 valid_name = false; | |
69 } | |
49 label[labellen++] = ch; | 70 label[labellen++] = ch; |
50 } | 71 } |
51 | 72 |
52 // Allow empty label at end of name to disable suffix search. | 73 // Allow empty label at end of name to disable suffix search. |
53 if (labellen) { | 74 if (labellen) { |
54 if (namelen + labellen + 1 > sizeof name) | 75 if (namelen + labellen + 1 > sizeof name) |
55 return false; | 76 return false; |
56 name[namelen++] = static_cast<char>(labellen); | 77 name[namelen++] = static_cast<char>(labellen); |
57 memcpy(name + namelen, label, labellen); | 78 memcpy(name + namelen, label, labellen); |
58 namelen += labellen; | 79 namelen += labellen; |
59 labellen = 0; | 80 labellen = 0; |
60 } | 81 } |
61 | 82 |
83 UMA_HISTOGRAM_BOOLEAN("Net.ValidDNSName", valid_name); | |
Ryan Sleevi
2017/03/22 01:10:46
Did you mean to move this down further? That is, t
| |
84 | |
62 if (namelen + 1 > sizeof name) | 85 if (namelen + 1 > sizeof name) |
63 return false; | 86 return false; |
64 if (namelen == 0) // Empty names e.g. "", "." are not valid. | 87 if (namelen == 0) // Empty names e.g. "", "." are not valid. |
65 return false; | 88 return false; |
66 name[namelen++] = 0; // This is the root label (of length 0). | 89 name[namelen++] = 0; // This is the root label (of length 0). |
67 | 90 |
68 *out = std::string(name, namelen); | 91 *out = std::string(name, namelen); |
69 return true; | 92 return true; |
70 } | 93 } |
71 | 94 |
72 bool IsValidDNSDomain(const base::StringPiece& dotted) { | 95 bool IsValidDNSDomain(const base::StringPiece& dotted) { |
73 std::string dns_formatted; | 96 std::string dns_formatted; |
74 return DNSDomainFromDot(dotted, &dns_formatted); | 97 return DNSDomainFromDot(dotted, &dns_formatted); |
75 } | 98 } |
76 | 99 |
100 bool IsValidHostLabelCharacter(char c, bool is_first_char) { | |
101 return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || | |
102 (c >= '0' && c <= '9') || (!is_first_char && c == '-') || c == '_'; | |
103 } | |
104 | |
77 std::string DNSDomainToString(const base::StringPiece& domain) { | 105 std::string DNSDomainToString(const base::StringPiece& domain) { |
78 std::string ret; | 106 std::string ret; |
79 | 107 |
80 for (unsigned i = 0; i < domain.size() && domain[i]; i += domain[i] + 1) { | 108 for (unsigned i = 0; i < domain.size() && domain[i]; i += domain[i] + 1) { |
81 #if CHAR_MIN < 0 | 109 #if CHAR_MIN < 0 |
82 if (domain[i] < 0) | 110 if (domain[i] < 0) |
83 return std::string(); | 111 return std::string(); |
84 #endif | 112 #endif |
85 if (domain[i] > 63) | 113 if (domain[i] > 63) |
86 return std::string(); | 114 return std::string(); |
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158 return DELTA_IDENTICAL; | 186 return DELTA_IDENTICAL; |
159 else if (same_size && !any_missing) | 187 else if (same_size && !any_missing) |
160 return DELTA_REORDERED; | 188 return DELTA_REORDERED; |
161 else if (any_match) | 189 else if (any_match) |
162 return DELTA_OVERLAP; | 190 return DELTA_OVERLAP; |
163 else | 191 else |
164 return DELTA_DISJOINT; | 192 return DELTA_DISJOINT; |
165 } | 193 } |
166 | 194 |
167 } // namespace net | 195 } // namespace net |
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