lib/tsocket: add tsocket_address_is_inet() function

metze

lib/tsocket/tsocket.h

@@ -101,6 +101,7 @@ struct iovec;
  *
  * @return              The address as a string representation, NULL on error.
  *
+ * @see tsocket_address_is_inet()
  * @see tsocket_address_inet_addr_string()
  * @see tsocket_address_inet_port()
  */
@@ -486,6 +487,20 @@ int tstream_disconnect_recv(struct tevent_req *req,
  * @{
  */
 
+/**
+ * @brief Find out if the tsocket_address represents an ipv4 or ipv6 endpoint.
+ *
+ * @param[in]  addr     The tsocket_address pointer
+ *
+ * @param[in]  fam      The family can be can be "ipv4", "ipv6" or "ip". With
+ *                      "ip" is autodetects "ipv4" or "ipv6" based on the
+ *                      addr.
+ *
+ * @return              true if addr represents an address of the given family,
+ *                      otherwise false.
+ */
+bool tsocket_address_is_inet(const struct tsocket_address *addr, const char *fam);
+
 #if DOXYGEN
 /**
  * @brief Create a tsocket_address for ipv4 and ipv6 endpoint addresses.
@@ -533,6 +548,8 @@ int _tsocket_address_inet_from_strings(TALLOC_CTX *mem_ctx,
  *
  * @return              A newly allocated string of the address, NULL on error
  *                      with errno set.
+ *
+ * @see tsocket_address_is_inet()
  */
 char *tsocket_address_inet_addr_string(const struct tsocket_address *addr,
 				       TALLOC_CTX *mem_ctx);

lib/tsocket/tsocket_bsd.c

@@ -294,6 +294,43 @@ ssize_t tsocket_address_bsd_sockaddr(const struct tsocket_address *addr,
 	return sa_socklen;
 }
 
+bool tsocket_address_is_inet(const struct tsocket_address *addr, const char *fam)
+{
+	struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
+					   struct tsocket_address_bsd);
+
+	if (!bsda) {
+		return false;
+	}
+
+	switch (bsda->u.sa.sa_family) {
+	case AF_INET:
+		if (strcasecmp(fam, "ip") == 0) {
+			return true;
+		}
+
+		if (strcasecmp(fam, "ipv4") == 0) {
+			return true;
+		}
+
+		return false;
+#ifdef HAVE_IPV6
+	case AF_INET6:
+		if (strcasecmp(fam, "ip") == 0) {
+			return true;
+		}
+
+		if (strcasecmp(fam, "ipv6") == 0) {
+			return true;
+		}
+
+		return false;
+#endif
+	}
+
+	return false;
+}
+
 int _tsocket_address_inet_from_strings(TALLOC_CTX *mem_ctx,
 				       const char *fam,
 				       const char *addr,