Add IPv6 support to wolfSSL_BIO_new_accept and wolfIO_TcpBind.

Author: kareem-wolfssl

src/bio.c

@@ -2442,7 +2442,14 @@ int wolfSSL_BIO_flush(WOLFSSL_BIO* bio)
         WOLFSSL_ENTER("wolfSSL_BIO_new_accept");
         bio = wolfSSL_BIO_new(wolfSSL_BIO_s_socket());
         if (bio) {
-            bio->port = (word16)XATOI(port);
+            const char* portStr = port;
+#ifdef WOLFSSL_IPV6
+            const char* ipv6End = XSTRSTR(port, "]");
+            if (ipv6End) {
+                portStr = XSTRSTR(ipv6End, ":");
+            }
+#endif
+            bio->port = (word16)XATOI(portStr);
             bio->type  = WOLFSSL_BIO_SOCKET;
         }
         return bio;

src/wolfio.c

@@ -1508,19 +1508,31 @@ int wolfIO_TcpBind(SOCKET_T* sockfd, word16 port)
 #ifdef HAVE_SOCKADDR
     int ret = 0;
     SOCKADDR_S addr;
+#ifdef WOLFSSL_IPV6
+    socklen_t sockaddr_len = sizeof(SOCKADDR_IN6);
+    SOCKADDR_IN6 *sin = (SOCKADDR_IN6 *)&addr;
+#else
     socklen_t sockaddr_len = sizeof(SOCKADDR_IN);
     SOCKADDR_IN *sin = (SOCKADDR_IN *)&addr;
+#endif
 
     if (sockfd == NULL || port < 1) {
         return WOLFSSL_FATAL_ERROR;
     }
 
     XMEMSET(&addr, 0, sizeof(addr));
 
+#ifdef WOLFSSL_IPV6
+    sin->sin6_family = AF_INET6;
+    sin->sin6_addr = in6addr_any;
+    sin->sin6_port = XHTONS(port);
+    *sockfd = (SOCKET_T)socket(AF_INET6, SOCK_STREAM, 0);
+#else
     sin->sin_family = AF_INET;
     sin->sin_addr.s_addr = INADDR_ANY;
     sin->sin_port = XHTONS(port);
     *sockfd = (SOCKET_T)socket(AF_INET, SOCK_STREAM, 0);
+#endif
 
 #ifdef USE_WINDOWS_API
     if (*sockfd == SOCKET_INVALID)