Make netmgr initialize and cleanup Winsock itself

On Windows, WSAStartup() needs to be called to initialize Winsock before
any sockets are created or else socket() calls will return error code
10093 (WSANOTINITIALISED).  Since BIND's Network Manager is intended to
work as a reusable networking library, it should take care of calling
WSAStartup() - and its cleanup counterpart, WSACleanup() - itself rather
than relying on external code to do it.  Add the necessary WSAStartup()
and WSACleanup() calls to isc_nm_start() and isc_nm_destroy(),
respectively.

(cherry picked from commit 88f96faba872cfe7006c6de84759515bdf6e9c47)

diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 9fc7a393312bae680d96fe142c4a84efb322e69e..7e3d778fc94ed61424ff39a7b92f692177c5e3a3 100644 (file)
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -185,11 +185,50 @@ isc__nm_test_lb_socket(sa_family_t sa_family, int protocol) {
        return (result == ISC_R_SUCCESS);
 }
 
+#ifdef WIN32
+static void
+isc__nm_winsock_initialize(void) {
+       WORD wVersionRequested = MAKEWORD(2, 2);
+       WSADATA wsaData;
+       int result;
+
+       result = WSAStartup(wVersionRequested, &wsaData);
+       if (result != 0) {
+               char strbuf[ISC_STRERRORSIZE];
+               strerror_r(result, strbuf, sizeof(strbuf));
+               UNEXPECTED_ERROR(__FILE__, __LINE__,
+                                "WSAStartup() failed with error code %lu: %s",
+                                result, strbuf);
+       }
+
+       /*
+        * Confirm that the WinSock DLL supports version 2.2.  Note that if the
+        * DLL supports versions greater than 2.2 in addition to 2.2, it will
+        * still return 2.2 in wVersion since that is the version we requested.
+        */
+       if (LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
+               UNEXPECTED_ERROR(__FILE__, __LINE__,
+                                "Unusable WinSock DLL version: %u.%u",
+                                LOBYTE(wsaData.wVersion),
+                                HIBYTE(wsaData.wVersion));
+       }
+}
+
+static void
+isc__nm_winsock_destroy(void) {
+       WSACleanup();
+}
+#endif /* WIN32 */
+
 isc_nm_t *
 isc_nm_start(isc_mem_t *mctx, uint32_t workers) {
        isc_nm_t *mgr = NULL;
        char name[32];
 
+#ifdef WIN32
+       isc__nm_winsock_initialize();
+#endif /* WIN32 */
+
        isc__nm_tls_initialize();
 
        if (!isc__nm_test_lb_socket(AF_INET, SOCK_DGRAM) ||
@@ -352,6 +391,10 @@ nm_destroy(isc_nm_t **mgr0) {
        isc_mem_put(mgr->mctx, mgr->workers,
                    mgr->nworkers * sizeof(isc__networker_t));
        isc_mem_putanddetach(&mgr->mctx, mgr, sizeof(*mgr));
+
+#ifdef WIN32
+       isc__nm_winsock_destroy();
+#endif /* WIN32 */
 }
 
 void