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-rw-r--r--src/OSSupport/UDPEndpointImpl.cpp608
1 files changed, 608 insertions, 0 deletions
diff --git a/src/OSSupport/UDPEndpointImpl.cpp b/src/OSSupport/UDPEndpointImpl.cpp
new file mode 100644
index 000000000..ece521ab8
--- /dev/null
+++ b/src/OSSupport/UDPEndpointImpl.cpp
@@ -0,0 +1,608 @@
+
+// UDPEndpointImpl.cpp
+
+// Implements the cUDPEndpointImpl class representing an implementation of an endpoint in UDP communication
+
+#include "Globals.h"
+#include "UDPEndpointImpl.h"
+#include "NetworkSingleton.h"
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// Globals:
+
+static bool IsValidSocket(evutil_socket_t a_Socket)
+{
+ #ifdef _WIN32
+ return (a_Socket != INVALID_SOCKET);
+ #else // _WIN32
+ return (a_Socket >= 0);
+ #endif // else _WIN32
+}
+
+
+
+
+
+/** Converts a_SrcAddr in IPv4 format to a_DstAddr in IPv6 format (using IPv4-mapped IPv6). */
+static void ConvertIPv4ToMappedIPv6(sockaddr_in & a_SrcAddr, sockaddr_in6 & a_DstAddr)
+{
+ memset(&a_DstAddr, 0, sizeof(a_DstAddr));
+ a_DstAddr.sin6_family = AF_INET6;
+ a_DstAddr.sin6_addr.s6_addr[10] = 0xff;
+ a_DstAddr.sin6_addr.s6_addr[11] = 0xff;
+ a_DstAddr.sin6_addr.s6_addr[12] = static_cast<Byte>((a_SrcAddr.sin_addr.s_addr >> 0) & 0xff);
+ a_DstAddr.sin6_addr.s6_addr[13] = static_cast<Byte>((a_SrcAddr.sin_addr.s_addr >> 8) & 0xff);
+ a_DstAddr.sin6_addr.s6_addr[14] = static_cast<Byte>((a_SrcAddr.sin_addr.s_addr >> 16) & 0xff);
+ a_DstAddr.sin6_addr.s6_addr[15] = static_cast<Byte>((a_SrcAddr.sin_addr.s_addr >> 24) & 0xff);
+ a_DstAddr.sin6_port = a_SrcAddr.sin_port;
+}
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cUDPSendAfterLookup:
+
+/** A hostname-to-IP resolver callback that sends the data stored within to the resolved IP address.
+This is used for sending UDP datagrams to hostnames, so that the cUDPEndpoint::Send() doesn't block.
+Instead an instance of this callback is queued for resolving and the data is sent once the IP is resolved. */
+class cUDPSendAfterLookup:
+ public cNetwork::cResolveNameCallbacks
+{
+public:
+ cUDPSendAfterLookup(const AString & a_Data, UInt16 a_Port, evutil_socket_t a_MainSock, evutil_socket_t a_SecondSock, bool a_IsMainSockIPv6):
+ m_Data(a_Data),
+ m_Port(a_Port),
+ m_MainSock(a_MainSock),
+ m_SecondSock(a_SecondSock),
+ m_IsMainSockIPv6(a_IsMainSockIPv6),
+ m_HasIPv4(false),
+ m_HasIPv6(false)
+ {
+ }
+
+protected:
+ /** The data to send after the hostname is resolved. */
+ AString m_Data;
+
+ /** The port to which to send the data. */
+ UInt16 m_Port;
+
+ /** The primary socket to use for sending. */
+ evutil_socket_t m_MainSock;
+
+ /** The secondary socket to use for sending, if needed by the OS. */
+ evutil_socket_t m_SecondSock;
+
+ /** True if m_MainSock is an IPv6 socket. */
+ bool m_IsMainSockIPv6;
+
+ /** The IPv4 address resolved, if any. */
+ sockaddr_in m_AddrIPv4;
+
+ /** Set to true if the name resolved to an IPv4 address. */
+ bool m_HasIPv4;
+
+ /** The IPv6 address resolved, if any. */
+ sockaddr_in6 m_AddrIPv6;
+
+ /** Set to true if the name resolved to an IPv6 address. */
+ bool m_HasIPv6;
+
+
+ // cNetwork::cResolveNameCallbacks overrides:
+ virtual void OnNameResolved(const AString & a_Name, const AString & a_PI) override
+ {
+ // Not needed
+ }
+
+ virtual bool OnNameResolvedV4(const AString & a_Name, const sockaddr_in * a_IP) override
+ {
+ if (!m_HasIPv4)
+ {
+ m_AddrIPv4 = *a_IP;
+ m_AddrIPv4.sin_port = htons(m_Port);
+ m_HasIPv4 = true;
+ }
+
+ // Don't want OnNameResolved() callback
+ return false;
+ }
+
+ virtual bool OnNameResolvedV6(const AString & a_Name, const sockaddr_in6 * a_IP) override
+ {
+ if (!m_HasIPv6)
+ {
+ m_AddrIPv6 = *a_IP;
+ m_AddrIPv6.sin6_port = htons(m_Port);
+ m_HasIPv6 = true;
+ }
+
+ // Don't want OnNameResolved() callback
+ return false;
+ }
+
+ virtual void OnFinished(void) override
+ {
+ // Send the actual data, through the correct socket and using the correct resolved address:
+ if (m_IsMainSockIPv6)
+ {
+ if (m_HasIPv6)
+ {
+ sendto(m_MainSock, m_Data.data(), static_cast<socklen_t>(m_Data.size()), 0, reinterpret_cast<const sockaddr *>(&m_AddrIPv6), static_cast<socklen_t>(sizeof(m_AddrIPv6)));
+ }
+ else if (m_HasIPv4)
+ {
+ // If the secondary socket is valid, it is an IPv4 socket, so use that:
+ if (m_SecondSock != -1)
+ {
+ sendto(m_SecondSock, m_Data.data(), static_cast<socklen_t>(m_Data.size()), 0, reinterpret_cast<const sockaddr *>(&m_AddrIPv4), static_cast<socklen_t>(sizeof(m_AddrIPv4)));
+ }
+ else
+ {
+ // Need an address conversion from IPv4 to IPv6-mapped-IPv4:
+ ConvertIPv4ToMappedIPv6(m_AddrIPv4, m_AddrIPv6);
+ sendto(m_MainSock, m_Data.data(), static_cast<socklen_t>(m_Data.size()), 0, reinterpret_cast<const sockaddr *>(&m_AddrIPv6), static_cast<socklen_t>(sizeof(m_AddrIPv6)));
+ }
+ }
+ else
+ {
+ LOGD("UDP endpoint queued sendto: Name not resolved");
+ return;
+ }
+ }
+ else // m_IsMainSockIPv6
+ {
+ // Main socket is IPv4 only, only allow IPv4 dst address:
+ if (!m_HasIPv4)
+ {
+ LOGD("UDP endpoint queued sendto: Name not resolved to IPv4 for an IPv4-only socket");
+ return;
+ }
+ sendto(m_MainSock, m_Data.data(), static_cast<socklen_t>(m_Data.size()), 0, reinterpret_cast<const sockaddr *>(&m_AddrIPv4), static_cast<socklen_t>(sizeof(m_AddrIPv4)));
+ }
+ }
+
+ virtual void OnError(int a_ErrorCode, const AString & a_ErrorMsg) override
+ {
+ // Nothing needed
+ }
+};
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cUDPEndpointImpl:
+
+cUDPEndpointImpl::cUDPEndpointImpl(UInt16 a_Port, cUDPEndpoint::cCallbacks & a_Callbacks):
+ super(a_Callbacks),
+ m_Port(0),
+ m_MainSock(-1),
+ m_IsMainSockIPv6(true),
+ m_SecondarySock(-1),
+ m_MainEvent(nullptr),
+ m_SecondaryEvent(nullptr)
+{
+ Open(a_Port);
+}
+
+
+
+
+
+void cUDPEndpointImpl::Close(void)
+{
+ if (m_Port == 0)
+ {
+ // Already closed
+ return;
+ }
+
+ // Close the LibEvent handles:
+ if (m_MainEvent != nullptr)
+ {
+ event_free(m_MainEvent);
+ m_MainEvent = nullptr;
+ }
+ if (m_SecondaryEvent != nullptr)
+ {
+ event_free(m_SecondaryEvent);
+ m_SecondaryEvent = nullptr;
+ }
+
+ // Close the OS sockets:
+ evutil_closesocket(m_MainSock);
+ m_MainSock = -1;
+ evutil_closesocket(m_SecondarySock);
+ m_SecondarySock = -1;
+
+ // Mark as closed:
+ m_Port = 0;
+}
+
+
+
+
+
+bool cUDPEndpointImpl::IsOpen(void) const
+{
+ return (m_Port != 0);
+}
+
+
+
+
+
+UInt16 cUDPEndpointImpl::GetPort(void) const
+{
+ return m_Port;
+}
+
+
+
+
+
+bool cUDPEndpointImpl::Send(const AString & a_Payload, const AString & a_Host, UInt16 a_Port)
+{
+ // If a_Host is an IP address, send the data directly:
+ sockaddr_storage sa;
+ int salen = static_cast<int>(sizeof(sa));
+ memset(&sa, 0, sizeof(sa));
+ if (evutil_parse_sockaddr_port(a_Host.c_str(), reinterpret_cast<sockaddr *>(&sa), &salen) != 0)
+ {
+ // a_Host is a hostname, we need to do a lookup first:
+ auto queue = std::make_shared<cUDPSendAfterLookup>(a_Payload, a_Port, m_MainSock, m_SecondarySock, m_IsMainSockIPv6);
+ return cNetwork::HostnameToIP(a_Host, queue);
+ }
+
+ // a_Host is an IP address and has been parsed into "sa"
+ // Insert the correct port and send data:
+ int NumSent;
+ switch (sa.ss_family)
+ {
+ case AF_INET:
+ {
+ reinterpret_cast<sockaddr_in *>(&sa)->sin_port = htons(a_Port);
+ if (m_IsMainSockIPv6)
+ {
+ if (IsValidSocket(m_SecondarySock))
+ {
+ // The secondary socket, which is always IPv4, is present:
+ NumSent = static_cast<int>(sendto(m_SecondarySock, a_Payload.data(), static_cast<socklen_t>(a_Payload.size()), 0, reinterpret_cast<const sockaddr *>(&sa), static_cast<socklen_t>(salen)));
+ }
+ else
+ {
+ // Need to convert IPv4 to IPv6 address before sending:
+ sockaddr_in6 IPv6;
+ ConvertIPv4ToMappedIPv6(*reinterpret_cast<sockaddr_in *>(&sa), IPv6);
+ NumSent = static_cast<int>(sendto(m_MainSock, a_Payload.data(), static_cast<socklen_t>(a_Payload.size()), 0, reinterpret_cast<const sockaddr *>(&IPv6), static_cast<socklen_t>(sizeof(IPv6))));
+ }
+ }
+ else
+ {
+ NumSent = static_cast<int>(sendto(m_MainSock, a_Payload.data(), static_cast<socklen_t>(a_Payload.size()), 0, reinterpret_cast<const sockaddr *>(&sa), static_cast<socklen_t>(salen)));
+ }
+ break;
+ }
+
+ case AF_INET6:
+ {
+ reinterpret_cast<sockaddr_in6 *>(&sa)->sin6_port = htons(a_Port);
+ NumSent = static_cast<int>(sendto(m_MainSock, a_Payload.data(), static_cast<socklen_t>(a_Payload.size()), 0, reinterpret_cast<const sockaddr *>(&sa), static_cast<socklen_t>(salen)));
+ break;
+ }
+ default:
+ {
+ LOGD("UDP sendto: Invalid address family for address \"%s\".", a_Host.c_str());
+ return false;
+ }
+ }
+ return (NumSent > 0);
+}
+
+
+
+
+
+void cUDPEndpointImpl::EnableBroadcasts(void)
+{
+ ASSERT(IsOpen());
+
+ // Enable broadcasts on the main socket:
+ // Some OSes use ints, others use chars, so we try both
+ int broadcastInt = 1;
+ char broadcastChar = 1;
+ // (Note that Windows uses const char * for option values, while Linux uses const void *)
+ if (setsockopt(m_MainSock, SOL_SOCKET, SO_BROADCAST, reinterpret_cast<const char *>(&broadcastInt), sizeof(broadcastInt)) == -1)
+ {
+ if (setsockopt(m_MainSock, SOL_SOCKET, SO_BROADCAST, &broadcastChar, sizeof(broadcastChar)) == -1)
+ {
+ int err = EVUTIL_SOCKET_ERROR();
+ LOGWARNING("Cannot enable broadcasts on port %d: %d (%s)", m_Port, err, evutil_socket_error_to_string(err));
+ return;
+ }
+
+ // Enable broadcasts on the secondary socket, if opened (use char, it worked for primary):
+ if (IsValidSocket(m_SecondarySock))
+ {
+ if (setsockopt(m_SecondarySock, SOL_SOCKET, SO_BROADCAST, &broadcastChar, sizeof(broadcastChar)) == -1)
+ {
+ int err = EVUTIL_SOCKET_ERROR();
+ LOGWARNING("Cannot enable broadcasts on port %d (secondary): %d (%s)", m_Port, err, evutil_socket_error_to_string(err));
+ }
+ }
+ return;
+ }
+
+ // Enable broadcasts on the secondary socket, if opened (use int, it worked for primary):
+ if (IsValidSocket(m_SecondarySock))
+ {
+ if (setsockopt(m_SecondarySock, SOL_SOCKET, SO_BROADCAST, reinterpret_cast<const char *>(&broadcastInt), sizeof(broadcastInt)) == -1)
+ {
+ int err = EVUTIL_SOCKET_ERROR();
+ LOGWARNING("Cannot enable broadcasts on port %d (secondary): %d (%s)", m_Port, err, evutil_socket_error_to_string(err));
+ }
+ }
+}
+
+
+
+
+
+void cUDPEndpointImpl::Open(UInt16 a_Port)
+{
+ ASSERT(m_Port == 0); // Must not be already open
+
+ // Make sure the cNetwork internals are innitialized:
+ cNetworkSingleton::Get();
+
+ // Set up the main socket:
+ // It should listen on IPv6 with IPv4 fallback, when available; IPv4 when IPv6 is not available.
+ bool NeedsTwoSockets = false;
+ m_IsMainSockIPv6 = true;
+ m_MainSock = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
+
+ int err;
+ if (!IsValidSocket(m_MainSock))
+ {
+ // Failed to create IPv6 socket, create an IPv4 one instead:
+ m_IsMainSockIPv6 = false;
+ err = EVUTIL_SOCKET_ERROR();
+ LOGD("Failed to create IPv6 MainSock: %d (%s)", err, evutil_socket_error_to_string(err));
+ m_MainSock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (!IsValidSocket(m_MainSock))
+ {
+ err = EVUTIL_SOCKET_ERROR();
+ m_Callbacks.OnError(err, Printf("Cannot create UDP socket for port %d: %s", a_Port, evutil_socket_error_to_string(err)));
+ return;
+ }
+
+ // Allow the port to be reused right after the socket closes:
+ if (evutil_make_listen_socket_reuseable(m_MainSock) != 0)
+ {
+ err = EVUTIL_SOCKET_ERROR();
+ LOG("UDP Port %d cannot be made reusable: %d (%s). Restarting the server might not work.",
+ a_Port, err, evutil_socket_error_to_string(err)
+ );
+ }
+
+ // Bind to all interfaces:
+ sockaddr_in name;
+ memset(&name, 0, sizeof(name));
+ name.sin_family = AF_INET;
+ name.sin_port = ntohs(a_Port);
+ if (bind(m_MainSock, reinterpret_cast<const sockaddr *>(&name), sizeof(name)) != 0)
+ {
+ err = EVUTIL_SOCKET_ERROR();
+ m_Callbacks.OnError(err, Printf("Cannot bind UDP port %d: %s", a_Port, evutil_socket_error_to_string(err)));
+ evutil_closesocket(m_MainSock);
+ return;
+ }
+ }
+ else
+ {
+ // IPv6 socket created, switch it into "dualstack" mode:
+ UInt32 Zero = 0;
+ #ifdef _WIN32
+ // WinXP doesn't support this feature, so if the setting fails, create another socket later on:
+ int res = setsockopt(m_MainSock, IPPROTO_IPV6, IPV6_V6ONLY, reinterpret_cast<const char *>(&Zero), sizeof(Zero));
+ err = EVUTIL_SOCKET_ERROR();
+ NeedsTwoSockets = ((res == SOCKET_ERROR) && (err == WSAENOPROTOOPT));
+ #else
+ setsockopt(m_MainSock, IPPROTO_IPV6, IPV6_V6ONLY, reinterpret_cast<const char *>(&Zero), sizeof(Zero));
+ #endif
+
+ // Allow the port to be reused right after the socket closes:
+ if (evutil_make_listen_socket_reuseable(m_MainSock) != 0)
+ {
+ err = EVUTIL_SOCKET_ERROR();
+ LOG("UDP Port %d cannot be made reusable: %d (%s). Restarting the server might not work.",
+ a_Port, err, evutil_socket_error_to_string(err)
+ );
+ }
+
+ // Bind to all interfaces:
+ sockaddr_in6 name;
+ memset(&name, 0, sizeof(name));
+ name.sin6_family = AF_INET6;
+ name.sin6_port = ntohs(a_Port);
+ if (bind(m_MainSock, reinterpret_cast<const sockaddr *>(&name), sizeof(name)) != 0)
+ {
+ err = EVUTIL_SOCKET_ERROR();
+ m_Callbacks.OnError(err, Printf("Cannot bind to UDP port %d: %s", a_Port, evutil_socket_error_to_string(err)));
+ evutil_closesocket(m_MainSock);
+ return;
+ }
+ }
+ if (evutil_make_socket_nonblocking(m_MainSock) != 0)
+ {
+ err = EVUTIL_SOCKET_ERROR();
+ m_Callbacks.OnError(err, Printf("Cannot make socket on UDP port %d nonblocking: %s", a_Port, evutil_socket_error_to_string(err)));
+ evutil_closesocket(m_MainSock);
+ return;
+ }
+ m_MainEvent = event_new(cNetworkSingleton::Get().GetEventBase(), m_MainSock, EV_READ | EV_PERSIST, RawCallback, this);
+ event_add(m_MainEvent, nullptr);
+
+ // Read the actual port number on which the socket is listening:
+ {
+ sockaddr_storage name;
+ socklen_t namelen = static_cast<socklen_t>(sizeof(name));
+ getsockname(m_MainSock, reinterpret_cast<sockaddr *>(&name), &namelen);
+ switch (name.ss_family)
+ {
+ case AF_INET:
+ {
+ sockaddr_in * sin = reinterpret_cast<sockaddr_in *>(&name);
+ m_Port = ntohs(sin->sin_port);
+ break;
+ }
+ case AF_INET6:
+ {
+ sockaddr_in6 * sin6 = reinterpret_cast<sockaddr_in6 *>(&name);
+ m_Port = ntohs(sin6->sin6_port);
+ break;
+ }
+ }
+ }
+
+ // If we don't need to create another socket, bail out now:
+ if (!NeedsTwoSockets)
+ {
+ return;
+ }
+
+ // If a secondary socket is required (WinXP dual-stack), create it here:
+ LOGD("Creating a second UDP socket for IPv4");
+ m_SecondarySock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+
+ if (!IsValidSocket(m_SecondarySock))
+ {
+ // Don't report as an error, the primary socket is working
+ err = EVUTIL_SOCKET_ERROR();
+ LOGD("Socket creation failed for secondary UDP socket for port %d: %d, %s", m_Port, err, evutil_socket_error_to_string(err));
+ return;
+ }
+
+ // Allow the port to be reused right after the socket closes:
+ if (evutil_make_listen_socket_reuseable(m_SecondarySock) != 0)
+ {
+ // Don't report as an error, the primary socket is working
+ err = EVUTIL_SOCKET_ERROR();
+ LOGD("UDP Port %d cannot be made reusable (second socket): %d (%s). Restarting the server might not work.",
+ a_Port, err, evutil_socket_error_to_string(err)
+ );
+ evutil_closesocket(m_SecondarySock);
+ m_SecondarySock = -1;
+ return;
+ }
+
+ // Make the secondary socket nonblocking:
+ if (evutil_make_socket_nonblocking(m_SecondarySock) != 0)
+ {
+ // Don't report as an error, the primary socket is working
+ err = EVUTIL_SOCKET_ERROR();
+ LOGD("evutil_make_socket_nonblocking() failed for secondary UDP socket: %d, %s", err, evutil_socket_error_to_string(err));
+ evutil_closesocket(m_SecondarySock);
+ m_SecondarySock = -1;
+ return;
+ }
+
+ // Bind to all IPv4 interfaces:
+ sockaddr_in name;
+ memset(&name, 0, sizeof(name));
+ name.sin_family = AF_INET;
+ name.sin_port = ntohs(m_Port);
+ if (bind(m_SecondarySock, reinterpret_cast<const sockaddr *>(&name), sizeof(name)) != 0)
+ {
+ // Don't report as an error, the primary socket is working
+ err = EVUTIL_SOCKET_ERROR();
+ LOGD("Cannot bind secondary socket to UDP port %d: %d (%s)", m_Port, err, evutil_socket_error_to_string(err));
+ evutil_closesocket(m_SecondarySock);
+ m_SecondarySock = -1;
+ return;
+ }
+
+ m_SecondaryEvent = event_new(cNetworkSingleton::Get().GetEventBase(), m_SecondarySock, EV_READ | EV_PERSIST, RawCallback, this);
+ event_add(m_SecondaryEvent, nullptr);
+}
+
+
+
+
+
+void cUDPEndpointImpl::RawCallback(evutil_socket_t a_Socket, short a_What, void * a_Self)
+{
+ cUDPEndpointImpl * Self = reinterpret_cast<cUDPEndpointImpl *>(a_Self);
+ Self->Callback(a_Socket, a_What);
+}
+
+
+
+
+
+void cUDPEndpointImpl::Callback(evutil_socket_t a_Socket, short a_What)
+{
+ if ((a_What & EV_READ) != 0)
+ {
+ // Receive datagram from the socket:
+ char buf[64 KiB];
+ socklen_t buflen = static_cast<socklen_t>(sizeof(buf));
+ sockaddr_storage sa;
+ socklen_t salen = static_cast<socklen_t>(sizeof(sa));
+ auto len = recvfrom(a_Socket, buf, buflen, 0, reinterpret_cast<sockaddr *>(&sa), &salen);
+ if (len >= 0)
+ {
+ // Convert the remote IP address to a string:
+ char RemoteHost[128];
+ UInt16 RemotePort;
+ switch (sa.ss_family)
+ {
+ case AF_INET:
+ {
+ auto sin = reinterpret_cast<sockaddr_in *>(&sa);
+ evutil_inet_ntop(sa.ss_family, &sin->sin_addr, RemoteHost, sizeof(RemoteHost));
+ RemotePort = ntohs(sin->sin_port);
+ break;
+ }
+ case AF_INET6:
+ {
+ auto sin = reinterpret_cast<sockaddr_in6 *>(&sa);
+ evutil_inet_ntop(sa.ss_family, &sin->sin6_addr, RemoteHost, sizeof(RemoteHost));
+ RemotePort = ntohs(sin->sin6_port);
+ break;
+ }
+ default:
+ {
+ return;
+ }
+ }
+
+ // Call the callback:
+ m_Callbacks.OnReceivedData(buf, static_cast<size_t>(len), RemoteHost, RemotePort);
+ }
+ }
+}
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cNetwork API:
+
+cUDPEndpointPtr cNetwork::CreateUDPEndpoint(UInt16 a_Port, cUDPEndpoint::cCallbacks & a_Callbacks)
+{
+ return std::make_shared<cUDPEndpointImpl>(a_Port, a_Callbacks);
+}
+
+
+
+