mirror of https://github.com/OpenTTD/OpenTTD.git
461 lines
15 KiB
C++
461 lines
15 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file core/address.cpp Implementation of the address. */
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#include "../../stdafx.h"
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#include "address.h"
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#include "../network_internal.h"
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#include "../../debug.h"
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#include "../../safeguards.h"
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/**
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* Get the hostname; in case it wasn't given the
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* IPv4 dotted representation is given.
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* @return the hostname
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*/
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const std::string &NetworkAddress::GetHostname()
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{
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if (this->hostname.empty() && this->address.ss_family != AF_UNSPEC) {
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assert(this->address_length != 0);
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char buffer[NETWORK_HOSTNAME_LENGTH];
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getnameinfo((struct sockaddr *)&this->address, this->address_length, buffer, sizeof(buffer), nullptr, 0, NI_NUMERICHOST);
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this->hostname = buffer;
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}
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return this->hostname;
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}
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/**
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* Get the port.
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* @return the port.
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*/
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uint16_t NetworkAddress::GetPort() const
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{
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switch (this->address.ss_family) {
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case AF_UNSPEC:
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case AF_INET:
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return ntohs(((const struct sockaddr_in *)&this->address)->sin_port);
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case AF_INET6:
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return ntohs(((const struct sockaddr_in6 *)&this->address)->sin6_port);
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default:
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NOT_REACHED();
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}
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}
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/**
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* Set the port.
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* @param port set the port number.
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*/
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void NetworkAddress::SetPort(uint16_t port)
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{
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switch (this->address.ss_family) {
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case AF_UNSPEC:
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case AF_INET:
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((struct sockaddr_in*)&this->address)->sin_port = htons(port);
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break;
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case AF_INET6:
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((struct sockaddr_in6*)&this->address)->sin6_port = htons(port);
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break;
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default:
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NOT_REACHED();
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}
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}
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/**
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* Helper to get the formatting string of an address for a given family.
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* @param family The family to get the address format for.
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* @param with_family Whether to add the familty to the address (e.g. IPv4).
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* @return The format string for the address.
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*/
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static const char *GetAddressFormatString(uint16_t family, bool with_family)
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{
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switch (family) {
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case AF_INET: return with_family ? "{}:{} (IPv4)" : "{}:{}";
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case AF_INET6: return with_family ? "[{}]:{} (IPv6)" : "[{}]:{}";
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default: return with_family ? "{}:{} (IPv?)" : "{}:{}";
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}
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}
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/**
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* Get the address as a string, e.g. 127.0.0.1:12345.
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* @param with_family whether to add the family (e.g. IPvX).
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* @return the address
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*/
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std::string NetworkAddress::GetAddressAsString(bool with_family)
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{
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return fmt::format(fmt::runtime(GetAddressFormatString(this->GetAddress()->ss_family, with_family)), this->GetHostname(), this->GetPort());
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}
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/**
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* Helper function to resolve without opening a socket.
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* @return the opened socket or INVALID_SOCKET
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*/
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static SOCKET ResolveLoopProc(addrinfo *)
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{
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/* We just want the first 'entry', so return a valid socket. */
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return !INVALID_SOCKET;
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}
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/**
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* Get the address in its internal representation.
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* @return the address
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*/
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const sockaddr_storage *NetworkAddress::GetAddress()
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{
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if (!this->IsResolved()) {
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/* Here we try to resolve a network address. We use SOCK_STREAM as
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* socket type because some stupid OSes, like Solaris, cannot be
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* bothered to implement the specifications and allow '0' as value
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* that means "don't care whether it is SOCK_STREAM or SOCK_DGRAM".
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*/
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this->Resolve(this->address.ss_family, SOCK_STREAM, AI_ADDRCONFIG, nullptr, ResolveLoopProc);
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this->resolved = true;
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}
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return &this->address;
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}
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/**
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* Checks of this address is of the given family.
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* @param family the family to check against
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* @return true if it is of the given family
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*/
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bool NetworkAddress::IsFamily(int family)
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{
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if (!this->IsResolved()) {
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this->Resolve(family, SOCK_STREAM, AI_ADDRCONFIG, nullptr, ResolveLoopProc);
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}
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return this->address.ss_family == family;
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}
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/**
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* Checks whether this IP address is contained by the given netmask.
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* @param netmask the netmask in CIDR notation to test against.
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* @note netmask without /n assumes all bits need to match.
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* @return true if this IP is within the netmask.
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*/
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bool NetworkAddress::IsInNetmask(const std::string &netmask)
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{
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/* Resolve it if we didn't do it already */
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if (!this->IsResolved()) this->GetAddress();
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int cidr = this->address.ss_family == AF_INET ? 32 : 128;
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NetworkAddress mask_address;
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/* Check for CIDR separator */
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auto cidr_separator_location = netmask.find('/');
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if (cidr_separator_location != std::string::npos) {
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int tmp_cidr = atoi(netmask.substr(cidr_separator_location + 1).c_str());
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/* Invalid CIDR, treat as single host */
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if (tmp_cidr > 0 && tmp_cidr < cidr) cidr = tmp_cidr;
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/* Remove the / so that NetworkAddress works on the IP portion */
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mask_address = NetworkAddress(netmask.substr(0, cidr_separator_location), 0, this->address.ss_family);
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} else {
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mask_address = NetworkAddress(netmask, 0, this->address.ss_family);
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}
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if (mask_address.GetAddressLength() == 0) return false;
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uint32_t *ip;
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uint32_t *mask;
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switch (this->address.ss_family) {
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case AF_INET:
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ip = (uint32_t*)&((struct sockaddr_in*)&this->address)->sin_addr.s_addr;
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mask = (uint32_t*)&((struct sockaddr_in*)&mask_address.address)->sin_addr.s_addr;
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break;
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case AF_INET6:
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ip = (uint32_t*)&((struct sockaddr_in6*)&this->address)->sin6_addr;
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mask = (uint32_t*)&((struct sockaddr_in6*)&mask_address.address)->sin6_addr;
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break;
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default:
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NOT_REACHED();
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}
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while (cidr > 0) {
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uint32_t msk = cidr >= 32 ? (uint32_t)-1 : htonl(-(1 << (32 - cidr)));
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if ((*mask++ & msk) != (*ip++ & msk)) return false;
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cidr -= 32;
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}
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return true;
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}
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/**
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* Resolve this address into a socket
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* @param family the type of 'protocol' (IPv4, IPv6)
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* @param socktype the type of socket (TCP, UDP, etc)
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* @param flags the flags to send to getaddrinfo
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* @param sockets the list of sockets to add the sockets to
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* @param func the inner working while looping over the address info
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* @return the resolved socket or INVALID_SOCKET.
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*/
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SOCKET NetworkAddress::Resolve(int family, int socktype, int flags, SocketList *sockets, LoopProc func)
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{
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struct addrinfo *ai;
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struct addrinfo hints;
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memset(&hints, 0, sizeof (hints));
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hints.ai_family = family;
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hints.ai_flags = flags;
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hints.ai_socktype = socktype;
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/* The port needs to be a string. Six is enough to contain all characters + '\0'. */
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std::string port_name = std::to_string(this->GetPort());
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bool reset_hostname = false;
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/* Setting both hostname to nullptr and port to 0 is not allowed.
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* As port 0 means bind to any port, the other must mean that
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* we want to bind to 'all' IPs. */
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if (this->hostname.empty() && this->address_length == 0 && this->GetPort() == 0) {
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reset_hostname = true;
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int fam = this->address.ss_family;
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if (fam == AF_UNSPEC) fam = family;
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this->hostname = fam == AF_INET ? "0.0.0.0" : "::";
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}
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static bool _resolve_timeout_error_message_shown = false;
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auto start = std::chrono::steady_clock::now();
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int e = getaddrinfo(this->hostname.empty() ? nullptr : this->hostname.c_str(), port_name.c_str(), &hints, &ai);
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auto end = std::chrono::steady_clock::now();
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std::chrono::seconds duration = std::chrono::duration_cast<std::chrono::seconds>(end - start);
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if (!_resolve_timeout_error_message_shown && duration >= std::chrono::seconds(5)) {
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Debug(net, 0, "getaddrinfo for hostname \"{}\", port {}, address family {} and socket type {} took {} seconds",
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this->hostname, port_name, AddressFamilyAsString(family), SocketTypeAsString(socktype), duration.count());
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Debug(net, 0, " this is likely an issue in the DNS name resolver's configuration causing it to time out");
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_resolve_timeout_error_message_shown = true;
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}
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if (reset_hostname) this->hostname.clear();
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if (e != 0) {
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if (func != ResolveLoopProc) {
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Debug(net, 0, "getaddrinfo for hostname \"{}\", port {}, address family {} and socket type {} failed: {}",
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this->hostname, port_name, AddressFamilyAsString(family), SocketTypeAsString(socktype), FS2OTTD(gai_strerror(e)));
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}
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return INVALID_SOCKET;
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}
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SOCKET sock = INVALID_SOCKET;
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for (struct addrinfo *runp = ai; runp != nullptr; runp = runp->ai_next) {
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/* When we are binding to multiple sockets, make sure we do not
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* connect to one with exactly the same address twice. That's
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* of course totally unneeded ;) */
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if (sockets != nullptr) {
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NetworkAddress address(runp->ai_addr, (int)runp->ai_addrlen);
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if (std::any_of(sockets->begin(), sockets->end(), [&address](const auto &p) { return p.second == address; })) continue;
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}
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sock = func(runp);
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if (sock == INVALID_SOCKET) continue;
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if (sockets == nullptr) {
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this->address_length = (int)runp->ai_addrlen;
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assert(sizeof(this->address) >= runp->ai_addrlen);
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memcpy(&this->address, runp->ai_addr, runp->ai_addrlen);
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#ifdef __EMSCRIPTEN__
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/* Emscripten doesn't zero sin_zero, but as we compare addresses
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* to see if they are the same address, we need them to be zero'd.
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* Emscripten is, as far as we know, the only OS not doing this.
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*
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* https://github.com/emscripten-core/emscripten/issues/12998
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*/
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if (this->address.ss_family == AF_INET) {
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sockaddr_in *address_ipv4 = (sockaddr_in *)&this->address;
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memset(address_ipv4->sin_zero, 0, sizeof(address_ipv4->sin_zero));
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}
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#endif
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break;
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}
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NetworkAddress addr(runp->ai_addr, (int)runp->ai_addrlen);
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(*sockets)[sock] = addr;
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sock = INVALID_SOCKET;
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}
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freeaddrinfo (ai);
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return sock;
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}
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/**
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* Helper function to resolve a listening.
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* @param runp information about the socket to try not
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* @return the opened socket or INVALID_SOCKET
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*/
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static SOCKET ListenLoopProc(addrinfo *runp)
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{
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std::string address = NetworkAddress(runp->ai_addr, (int)runp->ai_addrlen).GetAddressAsString();
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SOCKET sock = socket(runp->ai_family, runp->ai_socktype, runp->ai_protocol);
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if (sock == INVALID_SOCKET) {
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const char *type = NetworkAddress::SocketTypeAsString(runp->ai_socktype);
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const char *family = NetworkAddress::AddressFamilyAsString(runp->ai_family);
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Debug(net, 0, "Could not create {} {} socket: {}", type, family, NetworkError::GetLast().AsString());
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return INVALID_SOCKET;
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}
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if (runp->ai_socktype == SOCK_STREAM && !SetNoDelay(sock)) {
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Debug(net, 1, "Setting no-delay mode failed: {}", NetworkError::GetLast().AsString());
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}
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if (!SetReusePort(sock)) {
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Debug(net, 0, "Setting reuse-address mode failed: {}", NetworkError::GetLast().AsString());
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}
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int on = 1;
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if (runp->ai_family == AF_INET6 &&
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setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (const char*)&on, sizeof(on)) == -1) {
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Debug(net, 3, "Could not disable IPv4 over IPv6: {}", NetworkError::GetLast().AsString());
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}
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if (bind(sock, runp->ai_addr, (int)runp->ai_addrlen) != 0) {
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Debug(net, 0, "Could not bind socket on {}: {}", address, NetworkError::GetLast().AsString());
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closesocket(sock);
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return INVALID_SOCKET;
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}
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if (runp->ai_socktype != SOCK_DGRAM && listen(sock, 1) != 0) {
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Debug(net, 0, "Could not listen on socket: {}", NetworkError::GetLast().AsString());
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closesocket(sock);
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return INVALID_SOCKET;
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}
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/* Connection succeeded */
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if (!SetNonBlocking(sock)) {
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Debug(net, 0, "Setting non-blocking mode failed: {}", NetworkError::GetLast().AsString());
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}
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Debug(net, 3, "Listening on {}", address);
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return sock;
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}
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/**
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* Make the given socket listen.
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* @param socktype the type of socket (TCP, UDP, etc)
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* @param sockets the list of sockets to add the sockets to
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*/
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void NetworkAddress::Listen(int socktype, SocketList *sockets)
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{
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assert(sockets != nullptr);
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/* Setting both hostname to "" and port to 0 is not allowed.
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* As port 0 means bind to any port, the other must mean that
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* we want to bind to 'all' IPs. */
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if (this->address_length == 0 && this->address.ss_family == AF_UNSPEC &&
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this->hostname.empty() && this->GetPort() == 0) {
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this->Resolve(AF_INET, socktype, AI_ADDRCONFIG | AI_PASSIVE, sockets, ListenLoopProc);
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this->Resolve(AF_INET6, socktype, AI_ADDRCONFIG | AI_PASSIVE, sockets, ListenLoopProc);
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} else {
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this->Resolve(AF_UNSPEC, socktype, AI_ADDRCONFIG | AI_PASSIVE, sockets, ListenLoopProc);
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}
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}
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/**
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* Convert the socket type into a string
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* @param socktype the socket type to convert
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* @return the string representation
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* @note only works for SOCK_STREAM and SOCK_DGRAM
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*/
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/* static */ const char *NetworkAddress::SocketTypeAsString(int socktype)
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{
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switch (socktype) {
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case SOCK_STREAM: return "tcp";
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case SOCK_DGRAM: return "udp";
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default: return "unsupported";
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}
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}
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/**
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* Convert the address family into a string
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* @param family the family to convert
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* @return the string representation
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* @note only works for AF_INET, AF_INET6 and AF_UNSPEC
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*/
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/* static */ const char *NetworkAddress::AddressFamilyAsString(int family)
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{
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switch (family) {
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case AF_UNSPEC: return "either IPv4 or IPv6";
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case AF_INET: return "IPv4";
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case AF_INET6: return "IPv6";
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default: return "unsupported";
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}
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}
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/**
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* Get the peer address of a socket as NetworkAddress.
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* @param sock The socket to get the peer address of.
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* @return The NetworkAddress of the peer address.
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*/
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/* static */ NetworkAddress NetworkAddress::GetPeerAddress(SOCKET sock)
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{
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sockaddr_storage addr = {};
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socklen_t addr_len = sizeof(addr);
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if (getpeername(sock, (sockaddr *)&addr, &addr_len) != 0) {
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Debug(net, 0, "Failed to get address of the peer: {}", NetworkError::GetLast().AsString());
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return NetworkAddress();
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}
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return NetworkAddress(addr, addr_len);
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}
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/**
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* Get the local address of a socket as NetworkAddress.
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* @param sock The socket to get the local address of.
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* @return The NetworkAddress of the local address.
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*/
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/* static */ NetworkAddress NetworkAddress::GetSockAddress(SOCKET sock)
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{
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sockaddr_storage addr = {};
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socklen_t addr_len = sizeof(addr);
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if (getsockname(sock, (sockaddr *)&addr, &addr_len) != 0) {
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Debug(net, 0, "Failed to get address of the socket: {}", NetworkError::GetLast().AsString());
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return NetworkAddress();
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}
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return NetworkAddress(addr, addr_len);
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}
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/**
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* Get the peer name of a socket in string format.
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* @param sock The socket to get the peer name of.
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* @return The string representation of the peer name.
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*/
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/* static */ const std::string NetworkAddress::GetPeerName(SOCKET sock)
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{
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return NetworkAddress::GetPeerAddress(sock).GetAddressAsString();
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}
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/**
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* Convert a string containing either "hostname", "hostname:port" or invite code
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* to a ServerAddress, where the string can be postfixed with "#company" to
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* indicate the requested company.
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*
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* @param connection_string The string to parse.
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* @param default_port The default port to set port to if not in connection_string.
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* @param company Pointer to the company variable to set iff indicated.
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* @return A valid ServerAddress of the parsed information.
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*/
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/* static */ ServerAddress ServerAddress::Parse(const std::string &connection_string, uint16_t default_port, CompanyID *company_id)
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{
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if (connection_string.starts_with("+")) {
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std::string_view invite_code = ParseCompanyFromConnectionString(connection_string, company_id);
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return ServerAddress(SERVER_ADDRESS_INVITE_CODE, std::string(invite_code));
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}
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uint16_t port = default_port;
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std::string_view ip = ParseFullConnectionString(connection_string, port, company_id);
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return ServerAddress(SERVER_ADDRESS_DIRECT, std::string(ip) + ":" + std::to_string(port));
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}
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