rhubarb-lip-sync/lib/webrtc-8d2248ff/webrtc/p2p/base/candidate.h

303 lines
11 KiB
C
Raw Normal View History

2016-06-21 20:13:05 +00:00
/*
* 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 <algorithm>
#include <iomanip>
#include <sstream>
#include <string>
#include "webrtc/p2p/base/p2pconstants.h"
#include "webrtc/base/basictypes.h"
#include "webrtc/base/helpers.h"
#include "webrtc/base/network.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()
: id_(rtc::CreateRandomString(8)),
component_(0),
priority_(0),
network_type_(rtc::ADAPTER_TYPE_UNKNOWN),
generation_(0),
network_id_(0),
network_cost_(0) {}
Candidate(int component,
const std::string& protocol,
const rtc::SocketAddress& address,
uint32_t priority,
const std::string& username,
const std::string& password,
const std::string& type,
uint32_t generation,
const std::string& foundation,
uint16_t network_id = 0,
uint16_t network_cost = 0)
: id_(rtc::CreateRandomString(8)),
component_(component),
protocol_(protocol),
address_(address),
priority_(priority),
username_(username),
password_(password),
type_(type),
network_type_(rtc::ADAPTER_TYPE_UNKNOWN),
generation_(generation),
foundation_(foundation),
network_id_(network_id),
network_cost_(network_cost) {}
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; }
// The protocol used to talk to relay.
const std::string& relay_protocol() const { return relay_protocol_; }
void set_relay_protocol(const std::string& protocol) {
relay_protocol_ = protocol;
}
const rtc::SocketAddress & address() const { return address_; }
void set_address(const rtc::SocketAddress & address) {
address_ = address;
}
uint32_t priority() const { return priority_; }
void set_priority(const uint32_t priority) { priority_ = priority; }
// TODO(pthatcher): Remove once Chromium's jingle/glue/utils.cc
// doesn't use it.
// 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);
}
// TODO(pthatcher): Remove once Chromium's jingle/glue/utils.cc
// doesn't use it.
void set_preference(float preference) {
// Limiting priority to UINT_MAX when value exceeds uint32_t max.
// This can happen for e.g. when preference = 3.
uint64_t prio_val = static_cast<uint64_t>(preference * 127) << 24;
priority_ = static_cast<uint32_t>(
std::min(prio_val, static_cast<uint64_t>(UINT_MAX)));
}
// TODO(honghaiz): Change to usernameFragment or ufrag.
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;
}
rtc::AdapterType network_type() const { return network_type_; }
void set_network_type(rtc::AdapterType network_type) {
network_type_ = network_type;
}
// Candidates in a new generation replace those in the old generation.
uint32_t generation() const { return generation_; }
void set_generation(uint32_t 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_;
}
// |network_cost| measures the cost/penalty of using this candidate. A network
// cost of 0 indicates this candidate can be used freely. A value of
// rtc::kNetworkCostMax indicates it should be used only as the last resort.
void set_network_cost(uint16_t network_cost) {
ASSERT(network_cost <= rtc::kNetworkCostMax);
network_cost_ = network_cost;
}
uint16_t network_cost() const { return network_cost_; }
// An ID assigned to the network hosting the candidate.
uint16_t network_id() const { return network_id_; }
void set_network_id(uint16_t network_id) { network_id_ = network_id; }
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;
}
// The name of the transport channel of this candidate.
const std::string& transport_name() const { return transport_name_; }
void set_transport_name(const std::string& transport_name) {
transport_name_ = transport_name;
}
// 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 and the network cost, since they should be the same if the
// rest are.
return (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_) &&
(network_id_ == c.network_id_);
}
// Determines whether this candidate can be considered equivalent to the
// given one when looking for a matching candidate to remove.
bool MatchesForRemoval(const Candidate& c) const {
return component_ == c.component_ && protocol_ == c.protocol_ &&
address_ == c.address_;
}
std::string ToString() const {
return ToStringInternal(false);
}
std::string ToSensitiveString() const {
return ToStringInternal(true);
}
uint32_t GetPriority(uint32_t 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_);
}
bool operator==(const Candidate& o) const {
return id_ == o.id_ && component_ == o.component_ &&
protocol_ == o.protocol_ && relay_protocol_ == o.relay_protocol_ &&
address_ == o.address_ && priority_ == o.priority_ &&
username_ == o.username_ && password_ == o.password_ &&
type_ == o.type_ && network_name_ == o.network_name_ &&
network_type_ == o.network_type_ && generation_ == o.generation_ &&
foundation_ == o.foundation_ &&
related_address_ == o.related_address_ && tcptype_ == o.tcptype_ &&
transport_name_ == o.transport_name_ && network_id_ == o.network_id_;
}
bool operator!=(const Candidate& o) const { return !(*this == o); }
private:
std::string ToStringInternal(bool sensitive) const {
std::ostringstream ost;
std::string address = sensitive ? address_.ToSensitiveString() :
address_.ToString();
ost << "Cand[" << transport_name_ << ":" << foundation_ << ":" << component_
<< ":" << protocol_ << ":" << priority_ << ":" << address << ":"
<< type_ << ":" << related_address_ << ":" << username_ << ":"
<< password_ << ":" << network_id_ << ":" << network_cost_ << ":"
<< generation_ << "]";
return ost.str();
}
std::string id_;
int component_;
std::string protocol_;
std::string relay_protocol_;
rtc::SocketAddress address_;
uint32_t priority_;
std::string username_;
std::string password_;
std::string type_;
std::string network_name_;
rtc::AdapterType network_type_;
uint32_t generation_;
std::string foundation_;
rtc::SocketAddress related_address_;
std::string tcptype_;
std::string transport_name_;
uint16_t network_id_;
uint16_t network_cost_;
};
// Used during parsing and writing to map component to channel name
// and back. This is primarily for converting old G-ICE candidate
// signalling to new ICE candidate classes.
class CandidateTranslator {
public:
virtual ~CandidateTranslator() {}
virtual bool GetChannelNameFromComponent(
int component, std::string* channel_name) const = 0;
virtual bool GetComponentFromChannelName(
const std::string& channel_name, int* component) const = 0;
};
} // namespace cricket
#endif // WEBRTC_P2P_BASE_CANDIDATE_H_