Use Android reserved namespace for control interface

On Android, use a special reserved namespace for the UNIX domain
socket.

src/common/wpa_ctrl.c

@@ -20,6 +20,11 @@
 #include <sys/un.h>
 #endif /* CONFIG_CTRL_IFACE_UNIX */
 
+#ifdef ANDROID
+#include <cutils/sockets.h>
+#include "private/android_filesystem_config.h"
+#endif /* ANDROID */
+
 #include "wpa_ctrl.h"
 #include "common.h"
 
@@ -105,6 +110,31 @@ try_again:
 		return NULL;
 	}
 
+#ifdef ANDROID
+	chmod(ctrl->local.sun_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+	chown(ctrl->local.sun_path, AID_SYSTEM, AID_WIFI);
+	/*
+	 * If the ctrl_path isn't an absolute pathname, assume that
+	 * it's the name of a socket in the Android reserved namespace.
+	 * Otherwise, it's a normal UNIX domain socket appearing in the
+	 * filesystem.
+	 */
+	if (ctrl_path != NULL && *ctrl_path != '/') {
+		char buf[21];
+		os_snprintf(buf, sizeof(buf), "wpa_%s", ctrl_path);
+		if (socket_local_client_connect(
+			    ctrl->s, buf,
+			    ANDROID_SOCKET_NAMESPACE_RESERVED,
+			    SOCK_DGRAM) < 0) {
+			close(ctrl->s);
+			unlink(ctrl->local.sun_path);
+			os_free(ctrl);
+			return NULL;
+		}
+		return ctrl;
+	}
+#endif /* ANDROID */
+
 	ctrl->dest.sun_family = AF_UNIX;
 	res = os_strlcpy(ctrl->dest.sun_path, ctrl_path,
 			 sizeof(ctrl->dest.sun_path));

wpa_supplicant/ctrl_iface_unix.c

@@ -17,6 +17,9 @@
 #include <sys/stat.h>
 #include <grp.h>
 #include <stddef.h>
+#ifdef ANDROID
+#include <cutils/sockets.h>
+#endif /* ANDROID */
 
 #include "utils/common.h"
 #include "utils/eloop.h"
@@ -276,6 +279,13 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 	buf = os_strdup(wpa_s->conf->ctrl_interface);
 	if (buf == NULL)
 		goto fail;
+#ifdef ANDROID
+	os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
+		    wpa_s->conf->ctrl_interface);
+	priv->sock = android_get_control_socket(addr.sun_path);
+	if (priv->sock >= 0)
+		goto havesock;
+#endif /* ANDROID */
 	if (os_strncmp(buf, "DIR=", 4) == 0) {
 		dir = buf + 4;
 		gid_str = os_strstr(dir, " GROUP=");
@@ -398,6 +408,9 @@ wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
 	}
 	os_free(fname);
 
+#ifdef ANDROID
+havesock:
+#endif /* ANDROID */
 	eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
 				 wpa_s, priv);
 	wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
@@ -637,6 +650,12 @@ wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 	if (global->params.ctrl_interface == NULL)
 		return priv;
 
+#ifdef ANDROID
+	priv->sock = android_get_control_socket(global->params.ctrl_interface);
+	if (priv->sock >= 0)
+		goto havesock;
+#endif /* ANDROID */
+
 	wpa_printf(MSG_DEBUG, "Global control interface '%s'",
 		   global->params.ctrl_interface);
 
@@ -685,6 +704,9 @@ wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
 		}
 	}
 
+#ifdef ANDROID
+havesock:
+#endif /* ANDROID */
 	eloop_register_read_sock(priv->sock,
 				 wpa_supplicant_global_ctrl_iface_receive,
 				 global, NULL);