[Core] switch_sockaddr_info_get() will not resolve if the hostname is an IP address. Add new switch_is_ip_address() API. Add a unit-test. (#3055)

src/include/switch_utils.h

@@ -1519,6 +1519,13 @@ SWITCH_DECLARE(const char *) switch_memory_usage_stream(switch_stream_handle_t *
 **/
 SWITCH_DECLARE(int) switch_rand(void);
 
+/*!
+ * \brief Check if a hostname is a valid IP address (IPv4 or IPv6)
+ * \param hostname The hostname to check
+ * \return 1 if a valid IP address, 0 - otherwise
+ */
+SWITCH_DECLARE(int) switch_is_ip_address(const char *hostname);
+
 SWITCH_END_EXTERN_C
 #endif
 /* For Emacs:

src/switch_apr.c

@@ -841,6 +841,10 @@ SWITCH_DECLARE(switch_status_t) switch_sockaddr_create(switch_sockaddr_t **sa, s
 SWITCH_DECLARE(switch_status_t) switch_sockaddr_info_get(switch_sockaddr_t ** sa, const char *hostname, int32_t family,
 														 switch_port_t port, int32_t flags, switch_memory_pool_t *pool)
 {
+	if (!zstr(hostname) && switch_is_ip_address(hostname)) {
+		return switch_sockaddr_new(sa, hostname, port, pool);
+	}
+
 	return fspr_sockaddr_info_get(sa, hostname, family, port, flags, pool);
 }
 

src/switch_utils.c

@@ -4888,6 +4888,24 @@ SWITCH_DECLARE(int) switch_rand(void)
 #endif
 }
 
+SWITCH_DECLARE(int) switch_is_ip_address(const char *hostname)
+{
+	struct sockaddr_in sa;
+	struct sockaddr_in6 sa6;
+
+	if (!hostname) return 0;
+
+	if (inet_pton(AF_INET, hostname, &(sa.sin_addr)) == 1) {
+		return 1; /* It is a valid IPv4 address */
+	}
+
+	if (inet_pton(AF_INET6, hostname, &(sa6.sin6_addr)) == 1) {
+		return 1; /* It is a valid IPv6 address */
+	}
+
+	return 0; /* Not a valid IPv4 or IPv6 address */
+}
+
 /* For Emacs:
  * Local Variables:
  * mode:c