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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file core/address.h Wrapper for network addresses. */
#ifndef NETWORK_CORE_ADDRESS_H
#define NETWORK_CORE_ADDRESS_H
#include "os_abstraction.h"
#include "config.h"
#include "../../string_func.h"
#include "../../core/smallmap_type.hpp"
#include <string>
class NetworkAddress;
typedef std::vector<NetworkAddress> NetworkAddressList; ///< Type for a list of addresses.
typedef SmallMap<NetworkAddress, SOCKET> SocketList; ///< Type for a mapping between address and socket.
/**
* Wrapper for (un)resolved network addresses; there's no reason to transform
* a numeric IP to a string and then back again to pass it to functions. It
* furthermore allows easier delaying of the hostname lookup.
*/
class NetworkAddress {
private:
std::string hostname; ///< The hostname
int address_length; ///< The length of the resolved address
sockaddr_storage address; ///< The resolved address
bool resolved; ///< Whether the address has been (tried to be) resolved
/**
* Helper function to resolve something to a socket.
* @param runp information about the socket to try not
* @return the opened socket or INVALID_SOCKET
*/
typedef SOCKET (*LoopProc)(addrinfo *runp);
SOCKET Resolve(int family, int socktype, int flags, SocketList *sockets, LoopProc func);
public:
/**
* Create a network address based on a resolved IP and port.
* @param address The IP address with port.
* @param address_length The length of the address.
*/
NetworkAddress(struct sockaddr_storage &address, int address_length) :
address_length(address_length),
address(address),
resolved(address_length != 0)
{
}
/**
* Create a network address based on a resolved IP and port.
* @param address The IP address with port.
* @param address_length The length of the address.
*/
NetworkAddress(sockaddr *address, int address_length) :
address_length(address_length),
resolved(address_length != 0)
{
memset(&this->address, 0, sizeof(this->address));
memcpy(&this->address, address, address_length);
}
/**
* Create a network address based on a unresolved host and port
* @param hostname the unresolved hostname
* @param port the port
* @param family the address family
*/
NetworkAddress(std::string_view hostname = "", uint16 port = 0, int family = AF_UNSPEC) :
address_length(0),
resolved(false)
{
if (!hostname.empty() && hostname.front() == '[' && hostname.back() == ']') {
hostname.remove_prefix(1);
hostname.remove_suffix(1);
}
this->hostname = hostname;
memset(&this->address, 0, sizeof(this->address));
this->address.ss_family = family;
this->SetPort(port);
}
const char *GetHostname();
void GetAddressAsString(char *buffer, const char *last, bool with_family = true);
std::string GetAddressAsString(bool with_family = true);
const sockaddr_storage *GetAddress();
/**
* Get the (valid) length of the address.
* @return the length
*/
int GetAddressLength()
{
/* Resolve it if we didn't do it already */
if (!this->IsResolved()) this->GetAddress();
return this->address_length;
}
uint16 GetPort() const;
void SetPort(uint16 port);
/**
* Check whether the IP address has been resolved already
* @return true iff the port has been resolved
*/
bool IsResolved() const
{
return this->resolved;
}
bool IsFamily(int family);
bool IsInNetmask(const char *netmask);
/**
* Compare the address of this class with the address of another.
* @param address the other address.
* @return < 0 if address is less, 0 if equal and > 0 if address is more
*/
int CompareTo(NetworkAddress &address)
{
int r = this->GetAddressLength() - address.GetAddressLength();
if (r == 0) r = this->address.ss_family - address.address.ss_family;
if (r == 0) r = memcmp(&this->address, &address.address, this->address_length);
if (r == 0) r = this->GetPort() - address.GetPort();
return r;
}
/**
* Compare the address of this class with the address of another.
* @param address the other address.
* @return true if both match.
*/
bool operator == (NetworkAddress &address)
{
return this->CompareTo(address) == 0;
}
/**
* Compare the address of this class with the address of another.
* @param address the other address.
* @return true if both match.
*/
bool operator == (NetworkAddress &address) const
{
return const_cast<NetworkAddress*>(this)->CompareTo(address) == 0;
}
/**
* Compare the address of this class with the address of another.
* @param address the other address.
* @return true if both do not match.
*/
bool operator != (NetworkAddress address) const
{
return const_cast<NetworkAddress*>(this)->CompareTo(address) != 0;
}
/**
* Compare the address of this class with the address of another.
* @param address the other address.
*/
bool operator < (NetworkAddress &address)
{
return this->CompareTo(address) < 0;
}
void Listen(int socktype, SocketList *sockets);
static const char *SocketTypeAsString(int socktype);
static const char *AddressFamilyAsString(int family);
static const std::string GetPeerName(SOCKET sock);
};
#endif /* NETWORK_CORE_ADDRESS_H */
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