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// Copyright (c) 2011 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.
//
// XmppConnectionGenerator does the following algorithm:
// proxy = ResolveProxyInformation(connection_options)
// for server in server_list
// get dns_addresses for server
// connection_list = (dns_addresses X connection methods X proxy).shuffle()
// for connection in connection_list
// yield connection
#include "jingle/notifier/communicator/xmpp_connection_generator.h"
#include <vector>
#include "base/bind.h"
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/sys_byteorder.h"
#include "jingle/notifier/base/server_information.h"
#include "jingle/notifier/communicator/connection_options.h"
#include "jingle/notifier/communicator/connection_settings.h"
#include "net/base/net_errors.h"
#include "net/base/sys_addrinfo.h"
#include "talk/base/httpcommon-inl.h"
#include "talk/base/task.h"
#include "talk/base/thread.h"
#include "talk/xmpp/prexmppauth.h"
#include "talk/xmpp/xmppclientsettings.h"
#include "talk/xmpp/xmppengine.h"
namespace notifier {
XmppConnectionGenerator::XmppConnectionGenerator(
Delegate* delegate,
net::HostResolver* host_resolver,
const ConnectionOptions* options,
bool try_ssltcp_first,
const ServerList& servers)
: delegate_(delegate),
host_resolver_(host_resolver),
settings_list_(new ConnectionSettingsList()),
settings_index_(0),
servers_(servers),
current_server_(servers_.end()),
try_ssltcp_first_(try_ssltcp_first),
successfully_resolved_dns_(false),
first_dns_error_(0),
should_resolve_dns_(true),
options_(options) {
DCHECK(delegate_);
DCHECK(host_resolver);
DCHECK(options_);
DCHECK_GT(servers_.size(), 0u);
}
XmppConnectionGenerator::~XmppConnectionGenerator() {
VLOG(1) << "XmppConnectionGenerator::~XmppConnectionGenerator";
}
// Starts resolving proxy information.
void XmppConnectionGenerator::StartGenerating() {
VLOG(1) << "XmppConnectionGenerator::StartGenerating";
// TODO(akalin): Detect proxy settings once we use Chrome sockets.
// Start iterating through the connections (which are generated on demand).
UseNextConnection();
}
namespace {
const char* const PROTO_NAMES[cricket::PROTO_LAST + 1] = {
"udp", "tcp", "ssltcp"
};
} // namespace
void XmppConnectionGenerator::UseNextConnection() {
DCHECK(settings_list_.get());
// Loop until we can use a connection or we run out of connections
// to try.
while (true) {
// Iterate to the next possible connection.
settings_index_++;
if (settings_index_ < settings_list_->GetCount()) {
// We have more connection settings in the settings_list_ to
// try, kick off the next one.
ConnectionSettings* settings =
settings_list_->GetSettings(settings_index_);
VLOG(1) << "*** Attempting " << PROTO_NAMES[settings->protocol()]
<< " connection to " << settings->server().IPAsString()
<< ":" << settings->server().port();
delegate_->OnNewSettings(*settings);
return;
}
// Iterate to the next possible server.
if (current_server_ == servers_.end()) {
current_server_ = servers_.begin();
} else {
++current_server_;
}
if (current_server_ == servers_.end()) {
// All out of possibilities.
VLOG(1) << "(" << buzz::XmppEngine::ERROR_SOCKET
<< ", " << first_dns_error_ << ")";
delegate_->OnExhaustedSettings(
successfully_resolved_dns_, first_dns_error_);
return;
}
if (should_resolve_dns_) {
// Resolve the server.
const net::HostPortPair& server = current_server_->server;
net::HostResolver::RequestInfo request_info(server);
int status =
host_resolver_.Resolve(
request_info, &address_list_,
base::Bind(&XmppConnectionGenerator::OnServerDNSResolved,
base::Unretained(this)),
bound_net_log_);
if (status == net::ERR_IO_PENDING) // OnServerDNSResolved will be called.
return;
HandleServerDNSResolved(status);
} else {
// We are not resolving DNS here (DNS will be resolved by a lower layer).
// Generate settings using an empty IP list (which will just use the
// host name for the current server).
std::vector<uint32> ip_list;
GenerateSettingsForIPList(ip_list);
}
}
}
void XmppConnectionGenerator::OnServerDNSResolved(int status) {
DCHECK_NE(status, net::ERR_IO_PENDING);
HandleServerDNSResolved(status);
// Reenter loop.
UseNextConnection();
}
void XmppConnectionGenerator::HandleServerDNSResolved(int status) {
DCHECK_NE(status, net::ERR_IO_PENDING);
VLOG(1) << "XmppConnectionGenerator::HandleServerDNSResolved";
// Print logging info.
VLOG(1) << " server: " << current_server_->server.ToString()
<< ", error: " << status;
if (status != net::OK) {
if (first_dns_error_ == 0)
first_dns_error_ = status;
return;
}
// Slurp the addresses into a vector.
std::vector<uint32> ip_list;
for (const addrinfo* addr = address_list_.head();
addr != NULL; addr = addr->ai_next) {
const sockaddr_in& sockaddr =
*reinterpret_cast<const sockaddr_in*>(addr->ai_addr);
uint32 ip = ntohl(sockaddr.sin_addr.s_addr);
ip_list.push_back(ip);
}
successfully_resolved_dns_ = !ip_list.empty();
for (int i = 0; i < static_cast<int>(ip_list.size()); ++i) {
VLOG(1) << " ip " << i
<< " : " << talk_base::SocketAddress::IPToString(ip_list[i]);
}
GenerateSettingsForIPList(ip_list);
}
void XmppConnectionGenerator::GenerateSettingsForIPList(
const std::vector<uint32>& ip_list) {
// Build the ip list.
DCHECK(settings_list_.get());
settings_index_ = -1;
settings_list_->ClearPermutations();
settings_list_->AddPermutations(
current_server_->server.host(),
ip_list,
current_server_->server.port(),
current_server_->special_port_magic,
try_ssltcp_first_);
}
} // namespace notifier
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