fix: harden the per-user IPC endpoint

gtk/main.c

@@ -2,8 +2,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/socket.h>
-#include <sys/un.h>
 #include <gtk/gtk.h>
 #include "ipc.h"
 
@@ -27,20 +25,9 @@ static GType imtype;
 static void
 srvconnect(Im *im)
 {
-	struct sockaddr_un addr;
-
 	if(im->fd >= 0)
 		return;
-	im->fd = socket(AF_UNIX, SOCK_STREAM, 0);
-	if(im->fd < 0)
-		return;
-	memset(&addr, 0, sizeof(addr));
-	addr.sun_family = AF_UNIX;
-	snprintf(addr.sun_path, sizeof(addr.sun_path), IPCPATH, getuid());
-	if(connect(im->fd, (struct sockaddr*)&addr, sizeof(addr)) < 0){
-		close(im->fd);
-		im->fd = -1;
-	}
+	im->fd = ipcconnect();
 }
 
 static void