Codechange: [Network] Use std::string for NetworkAddress' host name

src/network/core/address.cpp

@@ -23,11 +23,13 @@ static const int DEFAULT_CONNECT_TIMEOUT_SECONDS = 3; ///< Allow connect() three
  */
 const char *NetworkAddress::GetHostname()
 {
-	if (StrEmpty(this->hostname) && this->address.ss_family != AF_UNSPEC) {
+	if (this->hostname.empty() && this->address.ss_family != AF_UNSPEC) {
 		assert(this->address_length != 0);
-		getnameinfo((struct sockaddr *)&this->address, this->address_length, this->hostname, sizeof(this->hostname), nullptr, 0, NI_NUMERICHOST);
+		char buffer[NETWORK_HOSTNAME_LENGTH];
+		getnameinfo((struct sockaddr *)&this->address, this->address_length, buffer, sizeof(buffer), nullptr, 0, NI_NUMERICHOST);
+		this->hostname = buffer;
 	}
-	return this->hostname;
+	return this->hostname.c_str();
 }
 
 /**
@@ -234,32 +236,32 @@ SOCKET NetworkAddress::Resolve(int family, int socktype, int flags, SocketList *
 	/* Setting both hostname to nullptr and port to 0 is not allowed.
 	 * As port 0 means bind to any port, the other must mean that
 	 * we want to bind to 'all' IPs. */
-	if (StrEmpty(this->hostname) && this->address_length == 0 && this->GetPort() == 0) {
+	if (this->hostname.empty() && this->address_length == 0 && this->GetPort() == 0) {
 		reset_hostname = true;
 		int fam = this->address.ss_family;
 		if (fam == AF_UNSPEC) fam = family;
-		strecpy(this->hostname, fam == AF_INET ? "0.0.0.0" : "::", lastof(this->hostname));
+		this->hostname = fam == AF_INET ? "0.0.0.0" : "::";
 	}
 
 	static bool _resolve_timeout_error_message_shown = false;
 	auto start = std::chrono::steady_clock::now();
-	int e = getaddrinfo(StrEmpty(this->hostname) ? nullptr : this->hostname, port_name, &hints, &ai);
+	int e = getaddrinfo(this->hostname.empty() ? nullptr : this->hostname.c_str(), port_name, &hints, &ai);
 	auto end = std::chrono::steady_clock::now();
 	std::chrono::seconds duration = std::chrono::duration_cast<std::chrono::seconds>(end - start);
 	if (!_resolve_timeout_error_message_shown && duration >= std::chrono::seconds(5)) {
 		DEBUG(net, 0, "getaddrinfo for hostname \"%s\", port %s, address family %s and socket type %s took %i seconds",
-				this->hostname, port_name, AddressFamilyAsString(family), SocketTypeAsString(socktype), (int)duration.count());
+				this->hostname.c_str(), port_name, AddressFamilyAsString(family), SocketTypeAsString(socktype), (int)duration.count());
 		DEBUG(net, 0, "  this is likely an issue in the DNS name resolver's configuration causing it to time out");
 		_resolve_timeout_error_message_shown = true;
 	}
 
 
-	if (reset_hostname) strecpy(this->hostname, "", lastof(this->hostname));
+	if (reset_hostname) this->hostname.clear();
 
 	if (e != 0) {
 		if (func != ResolveLoopProc) {
 			DEBUG(net, 0, "getaddrinfo for hostname \"%s\", port %s, address family %s and socket type %s failed: %s",
-				this->hostname, port_name, AddressFamilyAsString(family), SocketTypeAsString(socktype), FS2OTTD(gai_strerror(e)).c_str());
+				this->hostname.c_str(), port_name, AddressFamilyAsString(family), SocketTypeAsString(socktype), FS2OTTD(gai_strerror(e)).c_str());
 		}
 		return INVALID_SOCKET;
 	}
@@ -442,11 +444,11 @@ void NetworkAddress::Listen(int socktype, SocketList *sockets)
 {
 	assert(sockets != nullptr);
 
-	/* Setting both hostname to nullptr and port to 0 is not allowed.
+	/* Setting both hostname to "" and port to 0 is not allowed.
 	 * As port 0 means bind to any port, the other must mean that
 	 * we want to bind to 'all' IPs. */
 	if (this->address_length == 0 && this->address.ss_family == AF_UNSPEC &&
-			StrEmpty(this->hostname) && this->GetPort() == 0) {
+			this->hostname.empty() && this->GetPort() == 0) {
 		this->Resolve(AF_INET,  socktype, AI_ADDRCONFIG | AI_PASSIVE, sockets, ListenLoopProc);
 		this->Resolve(AF_INET6, socktype, AI_ADDRCONFIG | AI_PASSIVE, sockets, ListenLoopProc);
 	} else {

src/network/core/address.h

@@ -28,10 +28,10 @@ typedef SmallMap<NetworkAddress, SOCKET> SocketList;    ///< Type for a mapping
  */
 class NetworkAddress {
 private:
-	char hostname[NETWORK_HOSTNAME_LENGTH]; ///< 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
+	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.
@@ -52,7 +52,6 @@ public:
 		address(address),
 		resolved(address_length != 0)
 	{
-		*this->hostname = '\0';
 	}
 
 	/**
@@ -64,7 +63,6 @@ public:
 		address_length(address_length),
 		resolved(address_length != 0)
 	{
-		*this->hostname = '\0';
 		memset(&this->address, 0, sizeof(this->address));
 		memcpy(&this->address, address, address_length);
 	}
@@ -75,16 +73,15 @@ public:
 	 * @param port the port
 	 * @param family the address family
 	 */
-	NetworkAddress(const char *hostname = "", uint16 port = 0, int family = AF_UNSPEC) :
+	NetworkAddress(std::string_view hostname = "", uint16 port = 0, int family = AF_UNSPEC) :
 		address_length(0),
 		resolved(false)
 	{
-		/* Also handle IPv6 bracket enclosed hostnames */
-		if (StrEmpty(hostname)) hostname = "";
-		if (*hostname == '[') hostname++;
-		strecpy(this->hostname, StrEmpty(hostname) ? "" : hostname, lastof(this->hostname));
-		char *tmp = strrchr(this->hostname, ']');
-		if (tmp != nullptr) *tmp = '\0';
+		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;

src/network/core/udp.cpp

@@ -28,11 +28,11 @@ NetworkUDPSocketHandler::NetworkUDPSocketHandler(NetworkAddressList *bind)
 			this->bind.push_back(addr);
 		}
 	} else {
-		/* As hostname nullptr and port 0/nullptr don't go well when
+		/* As an empty hostname and port 0 don't go well when
 		 * resolving it we need to add an address for each of
 		 * the address families we support. */
-		this->bind.emplace_back(nullptr, 0, AF_INET);
-		this->bind.emplace_back(nullptr, 0, AF_INET6);
+		this->bind.emplace_back("", 0, AF_INET);
+		this->bind.emplace_back("", 0, AF_INET6);
 	}
 }