Make get_remote_uid() work on BSD

I've attached a patch that will make file URIs work on operating systems
that provide the getpeereid() function call to check the user ID of the
peer connected to a UNIX domain socket.

configure.ac

@@ -445,6 +445,7 @@ esac
 if test x$enable_un = xyes; then
 	AC_DEFINE(HAVE_UN, 1, [Define if unix domain socket support is enabled])
 	STRUCT_UCRED
+	AC_CHECK_FUNCS(getpeereid)
 fi
 
 dnl --------------------------- Post Protocol Tests ---------------------------

src/listen.c

@@ -416,7 +416,13 @@ static int get_remote_uid(int fd)
 
 	return cred.uid;
 #else
-	(void)fd;
+#ifdef HAVE_GETPEEREID
+	uid_t euid;
+	gid_t egid;
+
+	if (getpeereid(fd, &euid, &egid) == 0)
+		return euid;
+#endif
 	return -1;
 #endif
 }