fix: harden the per-user IPC endpoint

xim/main.c

@@ -2,8 +2,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
-#include <sys/socket.h>
-#include <sys/un.h>
 #include <xcb/xcb.h>
 #include <xkbcommon/xkbcommon.h>
 #include <xcb-imdkit/imdkit.h>
@@ -119,22 +117,11 @@ srvclose(Ic *state)
 static int
 srvconnect(Ic *state)
 {
-	struct sockaddr_un addr;
-	int fd;
-
 	if(state->fd >= 0)
 		return 0;
-	fd = socket(AF_UNIX, SOCK_STREAM, 0);
-	if(fd < 0)
+	state->fd = ipcconnect();
+	if(state->fd < 0)
 		return -1;
-	memset(&addr, 0, sizeof(addr));
-	addr.sun_family = AF_UNIX;
-	snprintf(addr.sun_path, sizeof(addr.sun_path), IPCPATH, getuid());
-	if(connect(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0){
-		close(fd);
-		return -1;
-	}
-	state->fd = fd;
 	return 0;
 }