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// Copyright (c) 2010 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.
#include "net/base/mapped_host_resolver.h"
#include "base/string_tokenizer.h"
#include "base/string_util.h"
#include "net/base/net_util.h"
namespace net {
MappedHostResolver::MappedHostResolver(HostResolver* impl)
: impl_(impl) {
}
int MappedHostResolver::Resolve(const RequestInfo& info,
AddressList* addresses,
CompletionCallback* callback,
RequestHandle* out_req,
const BoundNetLog& net_log) {
// Modify the request before forwarding it to |impl_|.
RequestInfo modified_info = info;
RewriteRequest(&modified_info);
return impl_->Resolve(modified_info, addresses, callback, out_req, net_log);
}
void MappedHostResolver::CancelRequest(RequestHandle req) {
impl_->CancelRequest(req);
}
void MappedHostResolver::AddObserver(Observer* observer) {
impl_->AddObserver(observer);
}
void MappedHostResolver::RemoveObserver(Observer* observer) {
impl_->RemoveObserver(observer);
}
HostResolverImpl* MappedHostResolver::GetAsHostResolverImpl() {
return impl_->GetAsHostResolverImpl();
}
MappedHostResolver::~MappedHostResolver() {
}
bool MappedHostResolver::RewriteRequest(RequestInfo* info) const {
// Check if the hostname was excluded.
for (ExclusionRuleList::const_iterator it = exclusion_rules_.begin();
it != exclusion_rules_.end(); ++it) {
const ExclusionRule& rule = *it;
if (MatchPatternASCII(info->hostname(), rule.hostname_pattern))
return false;
}
// Check if the hostname was remapped.
for (MapRuleList::const_iterator it = map_rules_.begin();
it != map_rules_.end(); ++it) {
const MapRule& rule = *it;
if (!MatchPatternASCII(info->hostname(), rule.hostname_pattern))
continue; // This rule doesn't apply.
info->set_hostname(rule.replacement_hostname);
if (rule.replacement_port != -1)
info->set_port(rule.replacement_port);
return true;
}
return false;
}
bool MappedHostResolver::AddRuleFromString(const std::string& rule_string) {
std::string trimmed;
TrimWhitespaceASCII(rule_string, TRIM_ALL, &trimmed);
std::vector<std::string> parts;
SplitString(trimmed, ' ', &parts);
// Test for EXCLUSION rule.
if (parts.size() == 2 && LowerCaseEqualsASCII(parts[0], "exclude")) {
ExclusionRule rule;
rule.hostname_pattern = StringToLowerASCII(parts[1]);
exclusion_rules_.push_back(rule);
return true;
}
// Test for MAP rule.
if (parts.size() == 3 && LowerCaseEqualsASCII(parts[0], "map")) {
MapRule rule;
rule.hostname_pattern = StringToLowerASCII(parts[1]);
if (!ParseHostAndPort(parts[2], &rule.replacement_hostname,
&rule.replacement_port)) {
return false; // Failed parsing the hostname/port.
}
map_rules_.push_back(rule);
return true;
}
return false;
}
void MappedHostResolver::SetRulesFromString(const std::string& rules_string) {
exclusion_rules_.clear();
map_rules_.clear();
StringTokenizer rules(rules_string, ",");
while (rules.GetNext()) {
bool ok = AddRuleFromString(rules.token());
LOG_IF(ERROR, !ok) << "Failed parsing rule: " << rules.token();
}
}
} // namespace net
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