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434 lines
14 KiB
C++
434 lines
14 KiB
C++
/* $Id$ */
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/*
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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 "../../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 char *NetworkAddress::GetHostname()
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{
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if (StrEmpty(this->hostname) && this->address.ss_family != AF_UNSPEC) {
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assert(this->address_length != 0);
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getnameinfo((struct sockaddr *)&this->address, this->address_length, this->hostname, sizeof(this->hostname), NULL, 0, NI_NUMERICHOST);
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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 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 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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* Get the address as a string, e.g. 127.0.0.1:12345.
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* @param buffer the buffer to write to
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* @param last the last element in the buffer
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* @param with_family whether to add the family (e.g. IPvX).
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*/
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void NetworkAddress::GetAddressAsString(char *buffer, const char *last, bool with_family)
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{
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if (this->GetAddress()->ss_family == AF_INET6) buffer = strecpy(buffer, "[", last);
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buffer = strecpy(buffer, this->GetHostname(), last);
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if (this->GetAddress()->ss_family == AF_INET6) buffer = strecpy(buffer, "]", last);
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buffer += seprintf(buffer, last, ":%d", this->GetPort());
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if (with_family) {
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char family;
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switch (this->address.ss_family) {
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case AF_INET: family = '4'; break;
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case AF_INET6: family = '6'; break;
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default: family = '?'; break;
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}
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seprintf(buffer, last, " (IPv%c)", family);
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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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* @note NOT thread safe
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*/
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const char *NetworkAddress::GetAddressAsString(bool with_family)
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{
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/* 6 = for the : and 5 for the decimal port number */
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static char buf[NETWORK_HOSTNAME_LENGTH + 6 + 7];
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this->GetAddressAsString(buf, lastof(buf), with_family);
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return buf;
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}
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/**
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* Helper function to resolve without opening a socket.
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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 ResolveLoopProc(addrinfo *runp)
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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, NULL, 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, NULL, 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(char *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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char *chr_cidr = strchr(netmask, '/');
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if (chr_cidr != NULL) {
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int tmp_cidr = atoi(chr_cidr + 1);
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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 and then replace the / so that NetworkAddress works on the IP portion */
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*chr_cidr = '\0';
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mask_address = NetworkAddress(netmask, 0, this->address.ss_family);
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*chr_cidr = '/';
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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 *ip;
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uint32 *mask;
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switch (this->address.ss_family) {
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case AF_INET:
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ip = (uint32*)&((struct sockaddr_in*)&this->address)->sin_addr.s_addr;
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mask = (uint32*)&((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*)&((struct sockaddr_in6*)&this->address)->sin6_addr;
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mask = (uint32*)&((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 msk = cidr >= 32 ? (uint32)-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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char port_name[6];
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seprintf(port_name, lastof(port_name), "%u", this->GetPort());
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bool reset_hostname = false;
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/* Setting both hostname to NULL 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 (StrEmpty(this->hostname) && 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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strecpy(this->hostname, fam == AF_INET ? "0.0.0.0" : "::", lastof(this->hostname));
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}
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int e = getaddrinfo(StrEmpty(this->hostname) ? NULL : this->hostname, port_name, &hints, &ai);
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if (reset_hostname) strecpy(this->hostname, "", lastof(this->hostname));
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if (e != 0) {
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if (func != ResolveLoopProc) {
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DEBUG(net, 0, "getaddrinfo for hostname \"%s\", port %s, address family %s and socket type %s failed: %s",
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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 != NULL; 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 != NULL) {
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NetworkAddress address(runp->ai_addr, (int)runp->ai_addrlen);
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if (sockets->Contains(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 == NULL) {
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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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break;
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}
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NetworkAddress addr(runp->ai_addr, (int)runp->ai_addrlen);
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(*sockets)[addr] = sock;
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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 connected socket.
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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 ConnectLoopProc(addrinfo *runp)
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{
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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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const char *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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DEBUG(net, 1, "[%s] could not create %s socket: %s", type, family, strerror(errno));
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return INVALID_SOCKET;
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}
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if (!SetNoDelay(sock)) DEBUG(net, 1, "[%s] setting TCP_NODELAY failed", type);
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if (connect(sock, runp->ai_addr, (int)runp->ai_addrlen) != 0) {
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DEBUG(net, 1, "[%s] could not connect %s socket: %s", type, family, strerror(errno));
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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)) DEBUG(net, 0, "[%s] setting non-blocking mode failed", type);
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DEBUG(net, 1, "[%s] connected to %s", type, address);
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return sock;
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}
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/**
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* Connect to the given address.
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* @return the connected socket or INVALID_SOCKET.
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*/
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SOCKET NetworkAddress::Connect()
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{
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DEBUG(net, 1, "Connecting to %s", this->GetAddressAsString());
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return this->Resolve(AF_UNSPEC, SOCK_STREAM, AI_ADDRCONFIG, NULL, ConnectLoopProc);
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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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const char *type = NetworkAddress::SocketTypeAsString(runp->ai_socktype);
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const char *family = NetworkAddress::AddressFamilyAsString(runp->ai_family);
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const char *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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DEBUG(net, 0, "[%s] could not create %s socket on port %s: %s", type, family, address, strerror(errno));
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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, 3, "[%s] setting TCP_NODELAY failed for port %s", type, address);
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}
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int on = 1;
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/* The (const char*) cast is needed for windows!! */
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on)) == -1) {
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DEBUG(net, 3, "[%s] could not set reusable %s sockets for port %s: %s", type, family, address, strerror(errno));
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}
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#ifndef __OS2__
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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, "[%s] could not disable IPv4 over IPv6 on port %s: %s", type, address, strerror(errno));
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}
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#endif
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if (bind(sock, runp->ai_addr, (int)runp->ai_addrlen) != 0) {
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DEBUG(net, 1, "[%s] could not bind on %s port %s: %s", type, family, address, strerror(errno));
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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, 1, "[%s] could not listen at %s port %s: %s", type, family, address, strerror(errno));
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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)) DEBUG(net, 0, "[%s] setting non-blocking mode failed for %s port %s", type, family, address);
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DEBUG(net, 1, "[%s] listening on %s port %s", type, family, 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 != NULL);
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/* Setting both hostname to NULL 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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StrEmpty(this->hostname) && 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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