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-rw-r--r--src/network/core/address.cpp91
-rw-r--r--src/network/core/address.h2
-rw-r--r--src/network/core/tcp.h28
-rw-r--r--src/network/core/tcp_connect.cpp301
-rw-r--r--src/network/core/tcp_http.cpp4
-rw-r--r--src/network/core/tcp_http.h10
-rw-r--r--src/network/network.cpp41
-rw-r--r--src/network/network_internal.h1
8 files changed, 333 insertions, 145 deletions
diff --git a/src/network/core/address.cpp b/src/network/core/address.cpp
index d40a72420..205b5df22 100644
--- a/src/network/core/address.cpp
+++ b/src/network/core/address.cpp
@@ -14,8 +14,6 @@
#include "../../safeguards.h"
-static const int DEFAULT_CONNECT_TIMEOUT_SECONDS = 3; ///< Allow connect() three seconds to connect.
-
/**
* Get the hostname; in case it wasn't given the
* IPv4 dotted representation is given.
@@ -307,82 +305,6 @@ SOCKET NetworkAddress::Resolve(int family, int socktype, int flags, SocketList *
}
/**
- * Helper function to resolve a connected socket.
- * @param runp information about the socket to try not
- * @return the opened socket or INVALID_SOCKET
- */
-static SOCKET ConnectLoopProc(addrinfo *runp)
-{
- const char *type = NetworkAddress::SocketTypeAsString(runp->ai_socktype);
- const char *family = NetworkAddress::AddressFamilyAsString(runp->ai_family);
- std::string address = NetworkAddress(runp->ai_addr, (int)runp->ai_addrlen).GetAddressAsString();
-
- SOCKET sock = socket(runp->ai_family, runp->ai_socktype, runp->ai_protocol);
- if (sock == INVALID_SOCKET) {
- DEBUG(net, 1, "[%s] could not create %s socket: %s", type, family, NetworkError::GetLast().AsString());
- return INVALID_SOCKET;
- }
-
- if (!SetNoDelay(sock)) DEBUG(net, 1, "[%s] setting TCP_NODELAY failed", type);
-
- if (!SetNonBlocking(sock)) DEBUG(net, 0, "[%s] setting non-blocking mode failed", type);
-
- int err = connect(sock, runp->ai_addr, (int)runp->ai_addrlen);
- if (err != 0 && !NetworkError::GetLast().IsConnectInProgress()) {
- DEBUG(net, 1, "[%s] could not connect to %s over %s: %s", type, address.c_str(), family, NetworkError::GetLast().AsString());
- closesocket(sock);
- return INVALID_SOCKET;
- }
-
- fd_set write_fd;
- struct timeval tv;
-
- FD_ZERO(&write_fd);
- FD_SET(sock, &write_fd);
-
- /* Wait for connect() to either connect, timeout or fail. */
- tv.tv_usec = 0;
- tv.tv_sec = DEFAULT_CONNECT_TIMEOUT_SECONDS;
- int n = select(FD_SETSIZE, NULL, &write_fd, NULL, &tv);
- if (n < 0) {
- DEBUG(net, 1, "[%s] could not connect to %s: %s", type, address.c_str(), NetworkError::GetLast().AsString());
- closesocket(sock);
- return INVALID_SOCKET;
- }
-
- /* If no fd is selected, the timeout has been reached. */
- if (n == 0) {
- DEBUG(net, 1, "[%s] timed out while connecting to %s", type, address.c_str());
- closesocket(sock);
- return INVALID_SOCKET;
- }
-
- /* Retrieve last error, if any, on the socket. */
- NetworkError socket_error = GetSocketError(sock);
- if (socket_error.HasError()) {
- DEBUG(net, 1, "[%s] could not connect to %s: %s", type, address.c_str(), socket_error.AsString());
- closesocket(sock);
- return INVALID_SOCKET;
- }
-
- /* Connection succeeded. */
- DEBUG(net, 1, "[%s] connected to %s", type, address.c_str());
-
- return sock;
-}
-
-/**
- * Connect to the given address.
- * @return the connected socket or INVALID_SOCKET.
- */
-SOCKET NetworkAddress::Connect()
-{
- DEBUG(net, 1, "Connecting to %s", this->GetAddressAsString().c_str());
-
- return this->Resolve(AF_UNSPEC, SOCK_STREAM, AI_ADDRCONFIG, nullptr, ConnectLoopProc);
-}
-
-/**
* Helper function to resolve a listening.
* @param runp information about the socket to try not
* @return the opened socket or INVALID_SOCKET
@@ -486,3 +408,16 @@ void NetworkAddress::Listen(int socktype, SocketList *sockets)
default: return "unsupported";
}
}
+
+/**
+ * Get the peer name of a socket in string format.
+ * @param sock The socket to get the peer name of.
+ * @return The string representation of the peer name.
+ */
+/* static */ const std::string NetworkAddress::GetPeerName(SOCKET sock)
+{
+ sockaddr_storage addr;
+ socklen_t addr_len = sizeof(addr);
+ getpeername(sock, (sockaddr *)&addr, &addr_len);
+ return NetworkAddress(addr, addr_len).GetAddressAsString();
+}
diff --git a/src/network/core/address.h b/src/network/core/address.h
index b4364c95a..c3f95b492 100644
--- a/src/network/core/address.h
+++ b/src/network/core/address.h
@@ -171,11 +171,11 @@ public:
return this->CompareTo(address) < 0;
}
- SOCKET Connect();
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 */
diff --git a/src/network/core/tcp.h b/src/network/core/tcp.h
index 5acf9d12e..b90ce0232 100644
--- a/src/network/core/tcp.h
+++ b/src/network/core/tcp.h
@@ -15,6 +15,7 @@
#include "address.h"
#include "packet.h"
+#include <chrono>
#include <atomic>
/** The states of sending the packets. */
@@ -63,23 +64,28 @@ public:
*/
class TCPConnecter {
private:
- std::atomic<bool> connected;///< Whether we succeeded in making the connection
- std::atomic<bool> aborted; ///< Whether we bailed out (i.e. connection making failed)
- bool killed; ///< Whether we got killed
- SOCKET sock; ///< The socket we're connecting with
+ addrinfo *ai = nullptr; ///< getaddrinfo() allocated linked-list of resolved addresses.
+ std::vector<addrinfo *> addresses; ///< Addresses we can connect to.
+ size_t current_address = 0; ///< Current index in addresses we are trying.
- void Connect();
+ std::vector<SOCKET> sockets; ///< Pending connect() attempts.
+ std::chrono::steady_clock::time_point last_attempt; ///< Time we last tried to connect.
- static void ThreadEntry(TCPConnecter *param);
+ std::atomic<bool> is_resolved = false; ///< Whether resolving is done.
-protected:
- /** Address we're connecting to */
- NetworkAddress address;
+ void Resolve();
+ void OnResolved(addrinfo *ai);
+ bool TryNextAddress();
+ void Connect(addrinfo *address);
+ bool CheckActivity();
+
+ static void ResolveThunk(TCPConnecter *connecter);
public:
+ std::string connection_string; ///< Current address we are connecting to (before resolving).
+
TCPConnecter(const std::string &connection_string, uint16 default_port);
- /** Silence the warnings */
- virtual ~TCPConnecter() {}
+ virtual ~TCPConnecter();
/**
* Callback when the connection succeeded.
diff --git a/src/network/core/tcp_connect.cpp b/src/network/core/tcp_connect.cpp
index 81c4d8c26..cca9f09b7 100644
--- a/src/network/core/tcp_connect.cpp
+++ b/src/network/core/tcp_connect.cpp
@@ -15,6 +15,8 @@
#include "tcp.h"
#include "../network_internal.h"
+#include <deque>
+
#include "../../safeguards.h"
/** List of connections that are currently being created */
@@ -24,38 +26,271 @@ static std::vector<TCPConnecter *> _tcp_connecters;
* Create a new connecter for the given address
* @param connection_string the address to connect to
*/
-TCPConnecter::TCPConnecter(const std::string &connection_string, uint16 default_port) :
- connected(false),
- aborted(false),
- killed(false),
- sock(INVALID_SOCKET)
+TCPConnecter::TCPConnecter(const std::string &connection_string, uint16 default_port)
{
- this->address = ParseConnectionString(connection_string, default_port);
+ this->connection_string = NormalizeConnectionString(connection_string, default_port);
_tcp_connecters.push_back(this);
- if (!StartNewThread(nullptr, "ottd:tcp", &TCPConnecter::ThreadEntry, this)) {
- this->Connect();
+
+ if (!StartNewThread(nullptr, "ottd:resolve", &TCPConnecter::ResolveThunk, this)) {
+ this->Resolve();
+ }
+}
+
+TCPConnecter::~TCPConnecter()
+{
+ for (const auto &socket : this->sockets) {
+ close(socket);
}
+
+ freeaddrinfo(this->ai);
}
-/** The actual connection function */
-void TCPConnecter::Connect()
+/**
+ * Start a connection to the indicated address.
+ * @param address The address to connection to.
+ */
+void TCPConnecter::Connect(addrinfo *address)
{
- this->sock = this->address.Connect();
- if (this->sock == INVALID_SOCKET) {
- this->aborted = true;
- } else {
- this->connected = true;
+ SOCKET sock = socket(address->ai_family, address->ai_socktype, address->ai_protocol);
+ if (sock == INVALID_SOCKET) {
+ DEBUG(net, 0, "Could not create %s %s socket: %s", NetworkAddress::SocketTypeAsString(address->ai_socktype), NetworkAddress::AddressFamilyAsString(address->ai_family), NetworkError::GetLast().AsString());
+ return;
+ }
+
+ if (!SetNoDelay(sock)) DEBUG(net, 1, "Setting TCP_NODELAY failed");
+ if (!SetNonBlocking(sock)) DEBUG(net, 0, "Setting non-blocking mode failed");
+
+ NetworkAddress network_address = NetworkAddress(address->ai_addr, (int)address->ai_addrlen);
+ DEBUG(net, 4, "Attempting to connect to %s", network_address.GetAddressAsString().c_str());
+
+ int err = connect(sock, address->ai_addr, (int)address->ai_addrlen);
+ if (err != 0 && !NetworkError::GetLast().IsConnectInProgress()) {
+ closesocket(sock);
+
+ DEBUG(net, 1, "Could not connect to %s: %s", network_address.GetAddressAsString().c_str(), NetworkError::GetLast().AsString());
+ return;
+ }
+
+ this->sockets.push_back(sock);
+}
+
+/**
+ * Start the connect() for the next address in the list.
+ * @return True iff a new connect() is attempted.
+ */
+bool TCPConnecter::TryNextAddress()
+{
+ if (this->current_address >= this->addresses.size()) return false;
+
+ this->last_attempt = std::chrono::steady_clock::now();
+ this->Connect(this->addresses[this->current_address++]);
+
+ return true;
+}
+
+void TCPConnecter::OnResolved(addrinfo *ai)
+{
+ std::deque<addrinfo *> addresses_ipv4, addresses_ipv6;
+
+ /* Apply "Happy Eyeballs" if it is likely IPv6 is functional. */
+
+ /* Detect if IPv6 is likely to succeed or not. */
+ bool seen_ipv6 = false;
+ bool resort = true;
+ for (addrinfo *runp = ai; runp != nullptr; runp = runp->ai_next) {
+ if (runp->ai_family == AF_INET6) {
+ seen_ipv6 = true;
+ } else if (!seen_ipv6) {
+ /* We see an IPv4 before an IPv6; this most likely means there is
+ * no IPv6 available on the system, so keep the order of this
+ * list. */
+ resort = false;
+ break;
+ }
+ }
+
+ /* Convert the addrinfo into NetworkAddresses. */
+ for (addrinfo *runp = ai; runp != nullptr; runp = runp->ai_next) {
+ if (resort) {
+ if (runp->ai_family == AF_INET6) {
+ addresses_ipv6.emplace_back(runp);
+ } else {
+ addresses_ipv4.emplace_back(runp);
+ }
+ } else {
+ this->addresses.emplace_back(runp);
+ }
+ }
+
+ /* If we want to resort, make the list like IPv6 / IPv4 / IPv6 / IPv4 / ..
+ * for how ever many (round-robin) DNS entries we have. */
+ if (resort) {
+ while (!addresses_ipv4.empty() || !addresses_ipv6.empty()) {
+ if (!addresses_ipv6.empty()) {
+ this->addresses.push_back(addresses_ipv6.front());
+ addresses_ipv6.pop_front();
+ }
+ if (!addresses_ipv4.empty()) {
+ this->addresses.push_back(addresses_ipv4.front());
+ addresses_ipv4.pop_front();
+ }
+ }
+ }
+
+ if (_debug_net_level >= 5) {
+ DEBUG(net, 5, "%s resolved in:", this->connection_string.c_str());
+ for (const auto &address : this->addresses) {
+ DEBUG(net, 5, "- %s", NetworkAddress(address->ai_addr, (int)address->ai_addrlen).GetAddressAsString().c_str());
+ }
+ }
+
+ this->current_address = 0;
+}
+
+void TCPConnecter::Resolve()
+{
+ /* Port is already guaranteed part of the connection_string. */
+ NetworkAddress address = ParseConnectionString(this->connection_string, 0);
+
+ addrinfo hints;
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_flags = AI_ADDRCONFIG;
+ hints.ai_socktype = SOCK_STREAM;
+
+ char port_name[6];
+ seprintf(port_name, lastof(port_name), "%u", address.GetPort());
+
+ static bool getaddrinfo_timeout_error_shown = false;
+ auto start = std::chrono::steady_clock::now();
+
+ addrinfo *ai;
+ int e = getaddrinfo(address.GetHostname(), port_name, &hints, &ai);
+
+ auto end = std::chrono::steady_clock::now();
+ auto duration = std::chrono::duration_cast<std::chrono::seconds>(end - start);
+ if (!getaddrinfo_timeout_error_shown && duration >= std::chrono::seconds(5)) {
+ DEBUG(net, 0, "getaddrinfo() for address \"%s\" took %i seconds", this->connection_string.c_str(), (int)duration.count());
+ DEBUG(net, 0, " This is likely an issue in the DNS name resolver's configuration causing it to time out");
+ getaddrinfo_timeout_error_shown = true;
}
+
+ if (e != 0) {
+ DEBUG(misc, 0, "Failed to resolve DNS for %s", this->connection_string.c_str());
+ this->OnFailure();
+ return;
+ }
+
+ this->ai = ai;
+ this->OnResolved(ai);
+ this->is_resolved = true;
+}
+
+/* static */ void TCPConnecter::ResolveThunk(TCPConnecter *connecter)
+{
+ connecter->Resolve();
}
/**
- * Entry point for the new threads.
- * @param param the TCPConnecter instance to call Connect on.
+ * Check if there was activity for this connecter.
+ * @return True iff the TCPConnecter is done and can be cleaned up.
*/
-/* static */ void TCPConnecter::ThreadEntry(TCPConnecter *param)
+bool TCPConnecter::CheckActivity()
{
- param->Connect();
+ if (!this->is_resolved.load()) return false;
+
+ /* If there are no attempts pending, connect to the next. */
+ if (this->sockets.empty()) {
+ if (!this->TryNextAddress()) {
+ /* There were no more addresses to try, so we failed. */
+ this->OnFailure();
+ return true;
+ }
+ return false;
+ }
+
+ fd_set write_fd;
+ FD_ZERO(&write_fd);
+ for (const auto &socket : this->sockets) {
+ FD_SET(socket, &write_fd);
+ }
+
+ timeval tv;
+ tv.tv_usec = 0;
+ tv.tv_sec = 0;
+ int n = select(FD_SETSIZE, NULL, &write_fd, NULL, &tv);
+ /* select() failed; hopefully next try it doesn't. */
+ if (n < 0) {
+ /* select() normally never fails; so hopefully it works next try! */
+ DEBUG(net, 1, "select() failed with %s", NetworkError::GetLast().AsString());
+ return false;
+ }
+
+ /* No socket updates. */
+ if (n == 0) {
+ /* Wait 250ms between attempting another address. */
+ if (std::chrono::steady_clock::now() < this->last_attempt + std::chrono::milliseconds(250)) return false;
+
+ /* Try the next address in the list. */
+ if (this->TryNextAddress()) return false;
+
+ /* Wait up to 3 seconds since the last connection we started. */
+ if (std::chrono::steady_clock::now() < this->last_attempt + std::chrono::milliseconds(3000)) return false;
+
+ /* More than 3 seconds no socket reported activity, and there are no
+ * more address to try. Timeout the attempt. */
+ DEBUG(net, 0, "Timeout while connecting to %s", this->connection_string.c_str());
+
+ for (const auto &socket : this->sockets) {
+ closesocket(socket);
+ }
+ this->OnFailure();
+ return true;
+ }
+
+ /* Check for errors on any of the sockets. */
+ for (auto it = this->sockets.begin(); it != this->sockets.end(); /* nothing */) {
+ NetworkError socket_error = GetSocketError(*it);
+ if (socket_error.HasError()) {
+ DEBUG(net, 1, "Could not connect to %s: %s", NetworkAddress::GetPeerName(*it).c_str(), socket_error.AsString());
+ closesocket(*it);
+ it = this->sockets.erase(it);
+ } else {
+ it++;
+ }
+ }
+
+ /* In case all sockets had an error, queue a new one. */
+ if (this->sockets.empty()) {
+ if (!this->TryNextAddress()) {
+ /* There were no more addresses to try, so we failed. */
+ this->OnFailure();
+ return true;
+ }
+ return false;
+ }
+
+ /* At least one socket is connected. The first one that does is the one
+ * we will be using, and we close all other sockets. */
+ SOCKET connected_socket = INVALID_SOCKET;
+ for (auto it = this->sockets.begin(); it != this->sockets.end(); /* nothing */) {
+ if (connected_socket == INVALID_SOCKET && FD_ISSET(*it, &write_fd)) {
+ connected_socket = *it;
+ } else {
+ closesocket(*it);
+ }
+ it = this->sockets.erase(it);
+ }
+ assert(connected_socket != INVALID_SOCKET);
+
+ DEBUG(net, 1, "Connected to %s", this->connection_string.c_str());
+ if (_debug_net_level >= 5) {
+ DEBUG(net, 5, "- using %s", NetworkAddress::GetPeerName(connected_socket).c_str());
+ }
+
+ this->OnConnect(connected_socket);
+ return true;
}
/**
@@ -68,32 +303,22 @@ void TCPConnecter::Connect()
{
for (auto iter = _tcp_connecters.begin(); iter < _tcp_connecters.end(); /* nothing */) {
TCPConnecter *cur = *iter;
- const bool connected = cur->connected.load();
- const bool aborted = cur->aborted.load();
- if ((connected || aborted) && cur->killed) {
- iter = _tcp_connecters.erase(iter);
- if (cur->sock != INVALID_SOCKET) closesocket(cur->sock);
- delete cur;
- continue;
- }
- if (connected) {
- iter = _tcp_connecters.erase(iter);
- cur->OnConnect(cur->sock);
- delete cur;
- continue;
- }
- if (aborted) {
+
+ if (cur->CheckActivity()) {
iter = _tcp_connecters.erase(iter);
- cur->OnFailure();
delete cur;
- continue;
+ } else {
+ iter++;
}
- iter++;
}
}
/** Kill all connection attempts. */
/* static */ void TCPConnecter::KillAll()
{
- for (TCPConnecter *conn : _tcp_connecters) conn->killed = true;
+ for (auto iter = _tcp_connecters.begin(); iter < _tcp_connecters.end(); /* nothing */) {
+ TCPConnecter *cur = *iter;
+ iter = _tcp_connecters.erase(iter);
+ delete cur;
+ }
}
diff --git a/src/network/core/tcp_http.cpp b/src/network/core/tcp_http.cpp
index 3b7579fce..ccad120ae 100644
--- a/src/network/core/tcp_http.cpp
+++ b/src/network/core/tcp_http.cpp
@@ -203,9 +203,11 @@ int NetworkHTTPSocketHandler::HandleHeader()
*url = '\0';
+ std::string hostname = std::string(hname);
+
/* Restore the URL. */
*url = '/';
- new NetworkHTTPContentConnecter(hname, callback, url, data, depth);
+ new NetworkHTTPContentConnecter(hostname, callback, url, data, depth);
return 0;
}
diff --git a/src/network/core/tcp_http.h b/src/network/core/tcp_http.h
index cc9a3adac..d7be0c327 100644
--- a/src/network/core/tcp_http.h
+++ b/src/network/core/tcp_http.h
@@ -73,6 +73,7 @@ public:
/** Connect with a HTTP server and do ONE query. */
class NetworkHTTPContentConnecter : TCPConnecter {
+ std::string hostname; ///< Hostname we are connecting to.
HTTPCallback *callback; ///< Callback to tell that we received some data (or won't).
const char *url; ///< The URL we want to get at the server.
const char *data; ///< The data to send
@@ -81,14 +82,15 @@ class NetworkHTTPContentConnecter : TCPConnecter {
public:
/**
* Start the connecting.
- * @param connection_string The address to connect to.
+ * @param hostname The hostname to connect to.
* @param callback The callback for HTTP retrieval.
* @param url The url at the server.
* @param data The data to send.
* @param depth The depth (redirect recursion) of the queries.
*/
- NetworkHTTPContentConnecter(const std::string &connection_string, HTTPCallback *callback, const char *url, const char *data = nullptr, int depth = 0) :
- TCPConnecter(connection_string, 80),
+ NetworkHTTPContentConnecter(const std::string &hostname, HTTPCallback *callback, const char *url, const char *data = nullptr, int depth = 0) :
+ TCPConnecter(hostname, 80),
+ hostname(hostname),
callback(callback),
url(stredup(url)),
data(data),
@@ -110,7 +112,7 @@ public:
void OnConnect(SOCKET s) override
{
- new NetworkHTTPSocketHandler(s, this->callback, this->address.GetHostname(), this->url, this->data, this->depth);
+ new NetworkHTTPSocketHandler(s, this->callback, this->hostname.c_str(), this->url, this->data, this->depth);
/* We've relinquished control of data now. */
this->data = nullptr;
}
diff --git a/src/network/network.cpp b/src/network/network.cpp
index 83a93a22e..bbf6bb5de 100644
--- a/src/network/network.cpp
+++ b/src/network/network.cpp
@@ -502,6 +502,19 @@ std::string_view ParseFullConnectionString(const std::string &connection_string,
}
/**
+ * Normalize a connection string. That is, ensure there is a port in the string.
+ * @param connection_string The connection string to normalize.
+ * @param default_port The port to use if none is given.
+ * @return The normalized connection string.
+ */
+std::string NormalizeConnectionString(const std::string &connection_string, uint16 default_port)
+{
+ uint16 port = default_port;
+ std::string_view ip = ParseFullConnectionString(connection_string, port);
+ return std::string(ip) + ":" + std::to_string(port);
+}
+
+/**
* Convert a string containing either "hostname" or "hostname:ip" to a
* NetworkAddress.
*
@@ -1131,23 +1144,27 @@ static void NetworkGenerateServerId()
seprintf(_settings_client.network.network_id, lastof(_settings_client.network.network_id), "%s", hex_output);
}
-void NetworkStartDebugLog(const std::string &connection_string)
-{
- extern SOCKET _debug_socket; // Comes from debug.c
+class TCPNetworkDebugConnecter : TCPConnecter {
+public:
+ TCPNetworkDebugConnecter(const std::string &connection_string) : TCPConnecter(connection_string, NETWORK_DEFAULT_DEBUGLOG_PORT) {}
- NetworkAddress address = ParseConnectionString(connection_string, NETWORK_DEFAULT_DEBUGLOG_PORT);
+ void OnFailure() override
+ {
+ DEBUG(net, 0, "Failed to open connection to %s for redirecting DEBUG()", this->connection_string.c_str());
+ }
- DEBUG(net, 0, "Redirecting DEBUG() to %s", address.GetAddressAsString().c_str());
+ void OnConnect(SOCKET s) override
+ {
+ DEBUG(net, 0, "Redirecting DEBUG() to %s", this->connection_string.c_str());
- SOCKET s = address.Connect();
- if (s == INVALID_SOCKET) {
- DEBUG(net, 0, "Failed to open socket for redirection DEBUG()");
- return;
+ extern SOCKET _debug_socket;
+ _debug_socket = s;
}
+};
- _debug_socket = s;
-
- DEBUG(net, 0, "DEBUG() is now redirected");
+void NetworkStartDebugLog(const std::string &connection_string)
+{
+ new TCPNetworkDebugConnecter(connection_string);
}
/** This tries to launch the network for a given OS */
diff --git a/src/network/network_internal.h b/src/network/network_internal.h
index 2a2024bac..88af965cf 100644
--- a/src/network/network_internal.h
+++ b/src/network/network_internal.h
@@ -120,5 +120,6 @@ bool NetworkFindName(char *new_name, const char *last);
const char *GenerateCompanyPasswordHash(const char *password, const char *password_server_id, uint32 password_game_seed);
NetworkAddress ParseConnectionString(const std::string &connection_string, uint16 default_port);
+std::string NormalizeConnectionString(const std::string &connection_string, uint16 default_port);
#endif /* NETWORK_INTERNAL_H */