--- a/src/core/ngx_inet.c
+++ b/src/core/ngx_inet.c
@@ -1196,3 +1196,76 @@ ngx_inet_resolve_host(ngx_pool_t *pool, 
 }
 
 #endif /* NGX_HAVE_GETADDRINFO && NGX_HAVE_INET6 */
+
+
+ngx_int_t
+ngx_cmp_sockaddr(struct sockaddr *sa1, socklen_t slen1,
+    struct sockaddr *sa2, socklen_t slen2, ngx_uint_t cmp_port)
+{
+    struct sockaddr_in   *sin1, *sin2;
+#if (NGX_HAVE_INET6)
+    struct sockaddr_in6  *sin61, *sin62;
+#endif
+#if (NGX_HAVE_UNIX_DOMAIN)
+    struct sockaddr_un   *saun1, *saun2;
+#endif
+
+    if (sa1->sa_family != sa2->sa_family) {
+        return NGX_DECLINED;
+    }
+
+    switch (sa1->sa_family) {
+
+#if (NGX_HAVE_INET6)
+    case AF_INET6:
+
+        sin61 = (struct sockaddr_in6 *) sa1;
+        sin62 = (struct sockaddr_in6 *) sa2;
+
+        if (cmp_port && sin61->sin6_port != sin62->sin6_port) {
+            return NGX_DECLINED;
+        }
+
+        if (ngx_memcmp(&sin61->sin6_addr, &sin62->sin6_addr, 16) != 0) {
+            return NGX_DECLINED;
+        }
+
+        break;
+#endif
+
+#if (NGX_HAVE_UNIX_DOMAIN)
+    case AF_UNIX:
+
+       /* TODO length */
+
+       saun1 = (struct sockaddr_un *) sa1;
+       saun2 = (struct sockaddr_un *) sa2;
+
+       if (ngx_memcmp(&saun1->sun_path, &saun2->sun_path,
+                      sizeof(saun1->sun_path))
+           != 0)
+       {
+           return NGX_DECLINED;
+       }
+
+       break;
+#endif
+
+    default: /* AF_INET */
+
+        sin1 = (struct sockaddr_in *) sa1;
+        sin2 = (struct sockaddr_in *) sa2;
+
+        if (cmp_port && sin1->sin_port != sin2->sin_port) {
+            return NGX_DECLINED;
+        }
+
+        if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) {
+            return NGX_DECLINED;
+        }
+
+        break;
+    }
+
+    return NGX_OK;
+}