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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_P2P_BASE_CANDIDATE_H_
#define WEBRTC_P2P_BASE_CANDIDATE_H_
#include <limits.h>
#include <math.h>
#include <iomanip>
#include <sstream>
#include <string>
#include "webrtc/p2p/base/constants.h"
#include "webrtc/base/basictypes.h"
#include "webrtc/base/socketaddress.h"
namespace cricket {
// Candidate for ICE based connection discovery.
class Candidate {
public:
// TODO: Match the ordering and param list as per RFC 5245
// candidate-attribute syntax. http://tools.ietf.org/html/rfc5245#section-15.1
Candidate() : component_(0), priority_(0), generation_(0) {}
Candidate(const std::string& id, int component, const std::string& protocol,
const rtc::SocketAddress& address, uint32 priority,
const std::string& username, const std::string& password,
const std::string& type, const std::string& network_name,
uint32 generation, const std::string& foundation)
: id_(id), component_(component), protocol_(protocol), address_(address),
priority_(priority), username_(username), password_(password),
type_(type), network_name_(network_name), generation_(generation),
foundation_(foundation) {
}
const std::string & id() const { return id_; }
void set_id(const std::string & id) { id_ = id; }
int component() const { return component_; }
void set_component(int component) { component_ = component; }
const std::string & protocol() const { return protocol_; }
void set_protocol(const std::string & protocol) { protocol_ = protocol; }
const rtc::SocketAddress & address() const { return address_; }
void set_address(const rtc::SocketAddress & address) {
address_ = address;
}
uint32 priority() const { return priority_; }
void set_priority(const uint32 priority) { priority_ = priority; }
// void set_type_preference(uint32 type_preference) {
// priority_ = GetPriority(type_preference);
// }
// Maps old preference (which was 0.0-1.0) to match priority (which
// is 0-2^32-1) to to match RFC 5245, section 4.1.2.1. Also see
// https://docs.google.com/a/google.com/document/d/
// 1iNQDiwDKMh0NQOrCqbj3DKKRT0Dn5_5UJYhmZO-t7Uc/edit
float preference() const {
// The preference value is clamped to two decimal precision.
return static_cast<float>(((priority_ >> 24) * 100 / 127) / 100.0);
}
void set_preference(float preference) {
// Limiting priority to UINT_MAX when value exceeds uint32 max.
// This can happen for e.g. when preference = 3.
uint64 prio_val = static_cast<uint64>(preference * 127) << 24;
priority_ = static_cast<uint32>(
rtc::_min(prio_val, static_cast<uint64>(UINT_MAX)));
}
const std::string & username() const { return username_; }
void set_username(const std::string & username) { username_ = username; }
const std::string & password() const { return password_; }
void set_password(const std::string & password) { password_ = password; }
const std::string & type() const { return type_; }
void set_type(const std::string & type) { type_ = type; }
const std::string & network_name() const { return network_name_; }
void set_network_name(const std::string & network_name) {
network_name_ = network_name;
}
// Candidates in a new generation replace those in the old generation.
uint32 generation() const { return generation_; }
void set_generation(uint32 generation) { generation_ = generation; }
const std::string generation_str() const {
std::ostringstream ost;
ost << generation_;
return ost.str();
}
void set_generation_str(const std::string& str) {
std::istringstream ist(str);
ist >> generation_;
}
const std::string& foundation() const {
return foundation_;
}
void set_foundation(const std::string& foundation) {
foundation_ = foundation;
}
const rtc::SocketAddress & related_address() const {
return related_address_;
}
void set_related_address(
const rtc::SocketAddress & related_address) {
related_address_ = related_address;
}
const std::string& tcptype() const { return tcptype_; }
void set_tcptype(const std::string& tcptype){
tcptype_ = tcptype;
}
// Determines whether this candidate is equivalent to the given one.
bool IsEquivalent(const Candidate& c) const {
// We ignore the network name, since that is just debug information, and
// the priority, since that should be the same if the rest is (and it's
// a float so equality checking is always worrisome).
return (id_ == c.id_) &&
(component_ == c.component_) &&
(protocol_ == c.protocol_) &&
(address_ == c.address_) &&
(username_ == c.username_) &&
(password_ == c.password_) &&
(type_ == c.type_) &&
(generation_ == c.generation_) &&
(foundation_ == c.foundation_) &&
(related_address_ == c.related_address_);
}
std::string ToString() const {
return ToStringInternal(false);
}
std::string ToSensitiveString() const {
return ToStringInternal(true);
}
uint32 GetPriority(uint32 type_preference,
int network_adapter_preference,
int relay_preference) const {
// RFC 5245 - 4.1.2.1.
// priority = (2^24)*(type preference) +
// (2^8)*(local preference) +
// (2^0)*(256 - component ID)
// |local_preference| length is 2 bytes, 0-65535 inclusive.
// In our implemenation we will partion local_preference into
// 0 1
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | NIC Pref | Addr Pref |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// NIC Type - Type of the network adapter e.g. 3G/Wifi/Wired.
// Addr Pref - Address preference value as per RFC 3484.
// local preference = (NIC Type << 8 | Addr_Pref) - relay preference.
int addr_pref = IPAddressPrecedence(address_.ipaddr());
int local_preference = ((network_adapter_preference << 8) | addr_pref) +
relay_preference;
return (type_preference << 24) |
(local_preference << 8) |
(256 - component_);
}
private:
std::string ToStringInternal(bool sensitive) const {
std::ostringstream ost;
std::string address = sensitive ? address_.ToSensitiveString() :
address_.ToString();
ost << "Cand[" << foundation_ << ":" << component_ << ":"
<< protocol_ << ":" << priority_ << ":"
<< address << ":" << type_ << ":" << related_address_ << ":"
<< username_ << ":" << password_ << "]";
return ost.str();
}
std::string id_;
int component_;
std::string protocol_;
rtc::SocketAddress address_;
uint32 priority_;
std::string username_;
std::string password_;
std::string type_;
std::string network_name_;
uint32 generation_;
std::string foundation_;
rtc::SocketAddress related_address_;
std::string tcptype_;
};
} // namespace cricket
#endif // WEBRTC_P2P_BASE_CANDIDATE_H_
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