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// Copyright (c) 2009 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/mock_host_resolver.h"
#include "base/string_util.h"
#include "base/platform_thread.h"
#include "base/ref_counted.h"
#include "googleurl/src/url_canon_ip.h"
#include "net/base/net_errors.h"
namespace net {
namespace {
// Fills |addrlist| with a socket address for |host| which should be an
// IPv6 literal. Returns OK on success.
int ResolveIPV6LiteralUsingGURL(const std::string& host,
AddressList* addrlist) {
// GURL expects the hostname to be surrounded with brackets.
std::string host_brackets = "[" + host + "]";
url_parse::Component host_comp(0, host_brackets.size());
// Try parsing the hostname as an IPv6 literal.
unsigned char ipv6_addr[16]; // 128 bits.
bool ok = url_canon::IPv6AddressToNumber(host_brackets.data(),
host_comp,
ipv6_addr);
if (!ok) {
LOG(WARNING) << "Not an IPv6 literal: " << host;
return ERR_UNEXPECTED;
}
*addrlist = AddressList::CreateIPv6Address(ipv6_addr);
return OK;
}
} // namespace
MockHostResolverBase::MockHostResolverBase(bool use_caching)
: use_caching_(use_caching) {
Reset(NULL);
}
int MockHostResolverBase::Resolve(const RequestInfo& info,
AddressList* addresses,
CompletionCallback* callback,
RequestHandle* out_req,
LoadLog* load_log) {
if (synchronous_mode_) {
callback = NULL;
out_req = NULL;
}
return impl_->Resolve(info, addresses, callback, out_req, load_log);
}
void MockHostResolverBase::CancelRequest(RequestHandle req) {
impl_->CancelRequest(req);
}
void MockHostResolverBase::AddObserver(Observer* observer) {
impl_->AddObserver(observer);
}
void MockHostResolverBase::RemoveObserver(Observer* observer) {
impl_->RemoveObserver(observer);
}
HostCache* MockHostResolverBase::GetHostCache() {
return impl_->GetHostCache();
}
void MockHostResolverBase::Shutdown() {
impl_->Shutdown();
}
void MockHostResolverBase::Reset(HostResolverProc* interceptor) {
synchronous_mode_ = false;
// At the root of the chain, map everything to localhost.
scoped_refptr<RuleBasedHostResolverProc> catchall =
new RuleBasedHostResolverProc(NULL);
catchall->AddRule("*", "127.0.0.1");
// Next add a rules-based layer the use controls.
rules_ = new RuleBasedHostResolverProc(catchall);
HostResolverProc* proc = rules_;
// Lastly add the provided interceptor to the front of the chain.
if (interceptor) {
interceptor->set_previous_proc(proc);
proc = interceptor;
}
int max_cache_entries = use_caching_ ? 100 : 0;
int max_cache_age_ms = use_caching_ ? 60000 : 0;
impl_ = new HostResolverImpl(proc, max_cache_entries, max_cache_age_ms);
}
//-----------------------------------------------------------------------------
struct RuleBasedHostResolverProc::Rule {
enum ResolverType {
kResolverTypeFail,
kResolverTypeSystem,
kResolverTypeIPV6Literal,
};
ResolverType resolver_type;
std::string host_pattern;
std::string replacement;
int latency_ms; // In milliseconds.
Rule(ResolverType resolver_type,
const std::string& host_pattern,
const std::string& replacement,
int latency_ms)
: resolver_type(resolver_type),
host_pattern(host_pattern),
replacement(replacement),
latency_ms(latency_ms) {}
};
RuleBasedHostResolverProc::RuleBasedHostResolverProc(HostResolverProc* previous)
: HostResolverProc(previous) {
}
RuleBasedHostResolverProc::~RuleBasedHostResolverProc() {
}
void RuleBasedHostResolverProc::AddRule(const std::string& host_pattern,
const std::string& replacement) {
DCHECK(!replacement.empty());
Rule rule(Rule::kResolverTypeSystem, host_pattern, replacement, 0);
rules_.push_back(rule);
}
void RuleBasedHostResolverProc::AddIPv6Rule(const std::string& host_pattern,
const std::string& ipv6_literal) {
Rule rule(Rule::kResolverTypeIPV6Literal, host_pattern, ipv6_literal, 0);
rules_.push_back(rule);
}
void RuleBasedHostResolverProc::AddRuleWithLatency(
const std::string& host_pattern,
const std::string& replacement,
int latency_ms) {
DCHECK(!replacement.empty());
Rule rule(Rule::kResolverTypeSystem, host_pattern, replacement, latency_ms);
rules_.push_back(rule);
}
void RuleBasedHostResolverProc::AllowDirectLookup(
const std::string& host_pattern) {
Rule rule(Rule::kResolverTypeSystem, host_pattern, "", 0);
rules_.push_back(rule);
}
void RuleBasedHostResolverProc::AddSimulatedFailure(
const std::string& host_pattern) {
Rule rule(Rule::kResolverTypeFail, host_pattern, "", 0);
rules_.push_back(rule);
}
int RuleBasedHostResolverProc::Resolve(const std::string& host,
AddressFamily address_family,
AddressList* addrlist) {
RuleList::iterator r;
for (r = rules_.begin(); r != rules_.end(); ++r) {
if (MatchPattern(host, r->host_pattern)) {
if (r->latency_ms != 0)
PlatformThread::Sleep(r->latency_ms);
// Remap to a new host.
const std::string& effective_host =
r->replacement.empty() ? host : r->replacement;
// Apply the resolving function to the remapped hostname.
switch (r->resolver_type) {
case Rule::kResolverTypeFail:
return ERR_NAME_NOT_RESOLVED;
case Rule::kResolverTypeSystem:
return SystemHostResolverProc(effective_host,
address_family,
addrlist);
case Rule::kResolverTypeIPV6Literal:
return ResolveIPV6LiteralUsingGURL(effective_host, addrlist);
default:
NOTREACHED();
return ERR_UNEXPECTED;
}
}
}
return ResolveUsingPrevious(host, address_family, addrlist);
}
//-----------------------------------------------------------------------------
ScopedDefaultHostResolverProc::ScopedDefaultHostResolverProc(
HostResolverProc* proc) : current_proc_(proc) {
previous_proc_ = HostResolverProc::SetDefault(current_proc_);
current_proc_->set_previous_proc(previous_proc_);
}
ScopedDefaultHostResolverProc::~ScopedDefaultHostResolverProc() {
HostResolverProc* old_proc = HostResolverProc::SetDefault(previous_proc_);
// The lifetimes of multiple instances must be nested.
CHECK(old_proc == current_proc_);
}
void ScopedDefaultHostResolverProc::Init(HostResolverProc* proc) {
current_proc_ = proc;
previous_proc_ = HostResolverProc::SetDefault(current_proc_);
current_proc_->set_previous_proc(previous_proc_);
}
} // namespace net
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