diff options
Diffstat (limited to 'chromium/net/base/registry_controlled_domains/registry_controlled_domain.cc')
| -rw-r--r-- | chromium/net/base/registry_controlled_domains/registry_controlled_domain.cc | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/chromium/net/base/registry_controlled_domains/registry_controlled_domain.cc b/chromium/net/base/registry_controlled_domains/registry_controlled_domain.cc new file mode 100644 index 00000000000..56d5ed9d6a1 --- /dev/null +++ b/chromium/net/base/registry_controlled_domains/registry_controlled_domain.cc @@ -0,0 +1,274 @@ +// Copyright (c) 2012 The Chromium Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +// NB: Modelled after Mozilla's code (originally written by Pamela Greene, +// later modified by others), but almost entirely rewritten for Chrome. +// (netwerk/dns/src/nsEffectiveTLDService.cpp) +/* ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Mozilla Effective-TLD Service + * + * The Initial Developer of the Original Code is + * Google Inc. + * Portions created by the Initial Developer are Copyright (C) 2006 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * Pamela Greene <pamg.bugs@gmail.com> (original author) + * Daniel Witte <dwitte@stanford.edu> + * + * Alternatively, the contents of this file may be used under the terms of + * either the GNU General Public License Version 2 or later (the "GPL"), or + * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +#include "net/base/registry_controlled_domains/registry_controlled_domain.h" + +#include "base/logging.h" +#include "base/strings/string_util.h" +#include "base/strings/utf_string_conversions.h" +#include "net/base/net_module.h" +#include "net/base/net_util.h" +#include "url/gurl.h" +#include "url/url_parse.h" + +#include "effective_tld_names.cc" + +namespace net { +namespace registry_controlled_domains { + +namespace { + +const int kExceptionRule = 1; +const int kWildcardRule = 2; +const int kPrivateRule = 4; + +const FindDomainPtr kDefaultFindDomainFunction = Perfect_Hash::FindDomain; + +// 'stringpool' is defined as a macro by the gperf-generated +// "effective_tld_names.cc". Provide a real constant value for it instead. +const char* const kDefaultStringPool = stringpool; +#undef stringpool + +FindDomainPtr g_find_domain_function = kDefaultFindDomainFunction; +const char* g_stringpool = kDefaultStringPool; + +size_t GetRegistryLengthImpl( + const std::string& host, + UnknownRegistryFilter unknown_filter, + PrivateRegistryFilter private_filter) { + DCHECK(!host.empty()); + + // Skip leading dots. + const size_t host_check_begin = host.find_first_not_of('.'); + if (host_check_begin == std::string::npos) + return 0; // Host is only dots. + + // A single trailing dot isn't relevant in this determination, but does need + // to be included in the final returned length. + size_t host_check_len = host.length(); + if (host[host_check_len - 1] == '.') { + --host_check_len; + DCHECK(host_check_len > 0); // If this weren't true, the host would be ".", + // and we'd have already returned above. + if (host[host_check_len - 1] == '.') + return 0; // Multiple trailing dots. + } + + // Walk up the domain tree, most specific to least specific, + // looking for matches at each level. + size_t prev_start = std::string::npos; + size_t curr_start = host_check_begin; + size_t next_dot = host.find('.', curr_start); + if (next_dot >= host_check_len) // Catches std::string::npos as well. + return 0; // This can't have a registry + domain. + while (1) { + const char* domain_str = host.data() + curr_start; + int domain_length = host_check_len - curr_start; + const DomainRule* rule = g_find_domain_function(domain_str, domain_length); + + // We need to compare the string after finding a match because the + // no-collisions of perfect hashing only refers to items in the set. Since + // we're searching for arbitrary domains, there could be collisions. + // Furthermore, if the apparent match is a private registry and we're not + // including those, it can't be an actual match. + if (rule) { + bool do_check = !(rule->type & kPrivateRule) || + private_filter == INCLUDE_PRIVATE_REGISTRIES; + if (do_check && base::strncasecmp(domain_str, + g_stringpool + rule->name_offset, + domain_length) == 0) { + // Exception rules override wildcard rules when the domain is an exact + // match, but wildcards take precedence when there's a subdomain. + if (rule->type & kWildcardRule && (prev_start != std::string::npos)) { + // If prev_start == host_check_begin, then the host is the registry + // itself, so return 0. + return (prev_start == host_check_begin) ? + 0 : (host.length() - prev_start); + } + + if (rule->type & kExceptionRule) { + if (next_dot == std::string::npos) { + // If we get here, we had an exception rule with no dots (e.g. + // "!foo"). This would only be valid if we had a corresponding + // wildcard rule, which would have to be "*". But we explicitly + // disallow that case, so this kind of rule is invalid. + NOTREACHED() << "Invalid exception rule"; + return 0; + } + return host.length() - next_dot - 1; + } + + // If curr_start == host_check_begin, then the host is the registry + // itself, so return 0. + return (curr_start == host_check_begin) ? + 0 : (host.length() - curr_start); + } + } + + if (next_dot >= host_check_len) // Catches std::string::npos as well. + break; + + prev_start = curr_start; + curr_start = next_dot + 1; + next_dot = host.find('.', curr_start); + } + + // No rule found in the registry. curr_start now points to the first + // character of the last subcomponent of the host, so if we allow unknown + // registries, return the length of this subcomponent. + return unknown_filter == INCLUDE_UNKNOWN_REGISTRIES ? + (host.length() - curr_start) : 0; +} + +std::string GetDomainAndRegistryImpl( + const std::string& host, PrivateRegistryFilter private_filter) { + DCHECK(!host.empty()); + + // Find the length of the registry for this host. + const size_t registry_length = + GetRegistryLengthImpl(host, INCLUDE_UNKNOWN_REGISTRIES, private_filter); + if ((registry_length == std::string::npos) || (registry_length == 0)) + return std::string(); // No registry. + // The "2" in this next line is 1 for the dot, plus a 1-char minimum preceding + // subcomponent length. + DCHECK(host.length() >= 2); + if (registry_length > (host.length() - 2)) { + NOTREACHED() << + "Host does not have at least one subcomponent before registry!"; + return std::string(); + } + + // Move past the dot preceding the registry, and search for the next previous + // dot. Return the host from after that dot, or the whole host when there is + // no dot. + const size_t dot = host.rfind('.', host.length() - registry_length - 2); + if (dot == std::string::npos) + return host; + return host.substr(dot + 1); +} + +} // namespace + +std::string GetDomainAndRegistry( + const GURL& gurl, + PrivateRegistryFilter filter) { + const url_parse::Component host = + gurl.parsed_for_possibly_invalid_spec().host; + if ((host.len <= 0) || gurl.HostIsIPAddress()) + return std::string(); + return GetDomainAndRegistryImpl(std::string( + gurl.possibly_invalid_spec().data() + host.begin, host.len), filter); +} + +std::string GetDomainAndRegistry( + const std::string& host, + PrivateRegistryFilter filter) { + url_canon::CanonHostInfo host_info; + const std::string canon_host(CanonicalizeHost(host, &host_info)); + if (canon_host.empty() || host_info.IsIPAddress()) + return std::string(); + return GetDomainAndRegistryImpl(canon_host, filter); +} + +bool SameDomainOrHost( + const GURL& gurl1, + const GURL& gurl2, + PrivateRegistryFilter filter) { + // See if both URLs have a known domain + registry, and those values are the + // same. + const std::string domain1(GetDomainAndRegistry(gurl1, filter)); + const std::string domain2(GetDomainAndRegistry(gurl2, filter)); + if (!domain1.empty() || !domain2.empty()) + return domain1 == domain2; + + // No domains. See if the hosts are identical. + const url_parse::Component host1 = + gurl1.parsed_for_possibly_invalid_spec().host; + const url_parse::Component host2 = + gurl2.parsed_for_possibly_invalid_spec().host; + if ((host1.len <= 0) || (host1.len != host2.len)) + return false; + return !strncmp(gurl1.possibly_invalid_spec().data() + host1.begin, + gurl2.possibly_invalid_spec().data() + host2.begin, + host1.len); +} + +size_t GetRegistryLength( + const GURL& gurl, + UnknownRegistryFilter unknown_filter, + PrivateRegistryFilter private_filter) { + const url_parse::Component host = + gurl.parsed_for_possibly_invalid_spec().host; + if (host.len <= 0) + return std::string::npos; + if (gurl.HostIsIPAddress()) + return 0; + return GetRegistryLengthImpl( + std::string(gurl.possibly_invalid_spec().data() + host.begin, host.len), + unknown_filter, + private_filter); +} + +size_t GetRegistryLength( + const std::string& host, + UnknownRegistryFilter unknown_filter, + PrivateRegistryFilter private_filter) { + url_canon::CanonHostInfo host_info; + const std::string canon_host(CanonicalizeHost(host, &host_info)); + if (canon_host.empty()) + return std::string::npos; + if (host_info.IsIPAddress()) + return 0; + return GetRegistryLengthImpl(canon_host, unknown_filter, private_filter); +} + +void SetFindDomainFunctionAndStringPoolForTesting(FindDomainPtr function, + const char* stringpool) { + g_find_domain_function = function ? function : kDefaultFindDomainFunction; + g_stringpool = stringpool ? stringpool : kDefaultStringPool; +} + +} // namespace registry_controlled_domains +} // namespace net |