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// 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.
#include <stdio.h>
#include <string>
#include "base/at_exit.h"
#include "base/bind.h"
#include "base/cancelable_callback.h"
#include "base/command_line.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop.h"
#include "base/string_number_conversions.h"
#include "base/string_util.h"
#include "base/time.h"
#include "net/base/address_list.h"
#include "net/base/host_cache.h"
#include "net/base/host_resolver_impl.h"
#include "net/base/net_errors.h"
#include "net/base/net_log.h"
#include "net/base/net_util.h"
#include "net/dns/dns_client.h"
#include "net/dns/dns_config_service.h"
#include "net/tools/gdig/file_net_log.h"
#if defined(OS_MACOSX)
#include "base/mac/scoped_nsautorelease_pool.h"
#endif
namespace net {
namespace {
class GDig {
public:
GDig();
enum Result {
RESULT_NO_RESOLVE = -3,
RESULT_NO_CONFIG = -2,
RESULT_WRONG_USAGE = -1,
RESULT_OK = 0,
};
Result Main(int argc, const char* argv[]);
private:
bool ParseCommandLine(int argc, const char* argv[]);
void Start();
void OnDnsConfig(const DnsConfig& dns_config);
void OnResolveComplete(int val);
void OnTimeout();
base::TimeDelta timeout_;
std::string domain_name_;
Result result_;
AddressList addrlist_;
base::CancelableClosure timeout_closure_;
scoped_ptr<DnsConfigService> dns_config_service_;
scoped_ptr<FileNetLog> log_;
scoped_ptr<HostResolver> resolver_;
};
GDig::GDig()
: timeout_(base::TimeDelta::FromSeconds(5)),
result_(GDig::RESULT_OK) {
}
GDig::Result GDig::Main(int argc, const char* argv[]) {
if (!ParseCommandLine(argc, argv)) {
fprintf(stderr,
"usage: %s [--net_log[=<basic|no_bytes|all>]]"
" [--config_timeout=<seconds>] domain_name\n",
argv[0]);
return RESULT_WRONG_USAGE;
}
#if defined(OS_MACOSX)
// Without this there will be a mem leak on osx.
base::mac::ScopedNSAutoreleasePool scoped_pool;
#endif
base::AtExitManager exit_manager;
MessageLoopForIO loop;
Start();
MessageLoop::current()->Run();
// Destroy it while MessageLoopForIO is alive.
dns_config_service_.reset();
return result_;
}
void GDig::OnResolveComplete(int val) {
MessageLoop::current()->Quit();
if (val != OK) {
fprintf(stderr, "Error trying to resolve hostname %s: %s\n",
domain_name_.c_str(), ErrorToString(val));
result_ = RESULT_NO_RESOLVE;
} else {
for (size_t i = 0; i < addrlist_.size(); ++i)
printf("%s\n", addrlist_[i].ToStringWithoutPort().c_str());
}
}
void GDig::OnTimeout() {
MessageLoop::current()->Quit();
fprintf(stderr, "Timed out waiting to load the dns config\n");
result_ = RESULT_NO_CONFIG;
}
void GDig::Start() {
dns_config_service_ = DnsConfigService::CreateSystemService();
dns_config_service_->Read(base::Bind(&GDig::OnDnsConfig,
base::Unretained(this)));
timeout_closure_.Reset(base::Bind(&GDig::OnTimeout, base::Unretained(this)));
MessageLoop::current()->PostDelayedTask(
FROM_HERE,
timeout_closure_.callback(),
timeout_);
}
void GDig::OnDnsConfig(const DnsConfig& dns_config) {
timeout_closure_.Cancel();
DCHECK(dns_config.IsValid());
scoped_ptr<DnsClient> dns_client(DnsClient::CreateClient(NULL));
dns_client->SetConfig(dns_config);
resolver_.reset(
new HostResolverImpl(
HostCache::CreateDefaultCache(),
PrioritizedDispatcher::Limits(NUM_PRIORITIES, 1),
HostResolverImpl::ProcTaskParams(NULL, 1),
scoped_ptr<DnsConfigService>(NULL),
dns_client.Pass(),
log_.get()));
HostResolver::RequestInfo info(HostPortPair(domain_name_.c_str(), 80));
CompletionCallback callback = base::Bind(&GDig::OnResolveComplete,
base::Unretained(this));
int ret = resolver_->Resolve(
info, &addrlist_, callback, NULL,
BoundNetLog::Make(log_.get(), net::NetLog::SOURCE_NONE));
DCHECK(ret == ERR_IO_PENDING);
}
bool GDig::ParseCommandLine(int argc, const char* argv[]) {
CommandLine::Init(argc, argv);
const CommandLine& parsed_command_line = *CommandLine::ForCurrentProcess();
if (parsed_command_line.GetArgs().size() != 1)
return false;
#if defined(OS_WIN)
domain_name_ = WideToASCII(parsed_command_line.GetArgs()[0]);
#else
domain_name_ = parsed_command_line.GetArgs()[0];
#endif
if (parsed_command_line.HasSwitch("config_timeout")) {
int timeout_seconds = 0;
bool parsed = base::StringToInt(
parsed_command_line.GetSwitchValueASCII("config_timeout"),
&timeout_seconds);
if (parsed && timeout_seconds > 0) {
timeout_ = base::TimeDelta::FromSeconds(timeout_seconds);
} else {
fprintf(stderr, "Invalid config_timeout parameter\n");
return false;
}
}
if (parsed_command_line.HasSwitch("net_log")) {
std::string log_param = parsed_command_line.GetSwitchValueASCII("net_log");
NetLog::LogLevel level = NetLog::LOG_ALL_BUT_BYTES;
if (log_param.length() > 0) {
std::map<std::string, NetLog::LogLevel> log_levels;
log_levels["all"] = NetLog::LOG_ALL;
log_levels["no_bytes"] = NetLog::LOG_ALL_BUT_BYTES;
log_levels["basic"] = NetLog::LOG_BASIC;
if (log_levels.find(log_param) != log_levels.end()) {
level = log_levels[log_param];
} else {
fprintf(stderr, "Invalid net_log parameter\n");
return false;
}
}
log_.reset(new FileNetLog(stderr, level));
}
return true;
}
} // empty namespace
} // namespace net
int main(int argc, const char* argv[]) {
net::GDig dig;
return dig.Main(argc, argv);
}
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