From fdfeec129ad893da265bb1d18335bbc9a808c9ba Mon Sep 17 00:00:00 2001
From: Mikael Magnusson <mikma@users.sourceforge.net>
Date: Mon, 11 Jan 2021 21:22:03 +0100
Subject: Wg-user: Use abstract unix sockets on Android

---
 sysdep/unix/wg_user.c | 27 ++++++++++++++++++++-------
 sysdep/unix/wg_user.h |  2 ++
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/sysdep/unix/wg_user.c b/sysdep/unix/wg_user.c
index 5f5428bf..2878ea1d 100644
--- a/sysdep/unix/wg_user.c
+++ b/sysdep/unix/wg_user.c
@@ -12,18 +12,32 @@
 #include "sysdep/linux/wireguard.h"
 
 static
-char *get_socket_path(const char *ifname, char *buf, uint size)
+socklen_t get_socket_path(const char *ifname, char *buf, uint size)
 {
-  bsnprintf(buf, size, SOCKET_PATH "%s.sock", ifname);
-  return buf;
+  int pos = 0;
+
+  if (size < 1)
+    return 0;
+
+#ifdef ANDROID
+  /* Abstract socket */
+  buf[pos++] = 0;
+#endif
+  bsnprintf(buf+pos, size-pos, SOCKET_PATH "%s.sock", ifname);
+  return pos + strlen(buf+pos);
 }
 
 bool wg_has_userspace(const char *ifname)
 {
   struct stat sb;
   char tmp[sizeof(struct sockaddr_un)];
+  socklen_t tmplen = get_socket_path(ifname, tmp, sizeof(tmp));
 
-  if (stat(get_socket_path(ifname, tmp, sizeof(tmp)), &sb) == 0)
+  if (tmplen > 0 && tmp[0] == 0)
+    /* System with abstract socket (Android) always use WireGuard's userspace
+       implementation. */
+    return true;
+  else if (stat(tmp, &sb) == 0)
     return (sb.st_mode & S_IFMT) == S_IFSOCK;
   else
     {
@@ -211,14 +225,13 @@ wg_user_set_device(struct pool *pool,
 		   struct wg_device *dev)
 {
   char path[sizeof(struct sockaddr_un)];
-
-  bsnprintf(path, sizeof(path), SOCKET_PATH "%s.sock", ifname);
+  socklen_t pathlen = get_socket_path(ifname, path, sizeof(path));
 
   struct birdsock *sock = sk_new(pool);
   sock->rx_hook = user_rx_hook;
   sock->tx_hook = user_tx_hook;
   sock->err_hook = user_err_hook;
-  int res = sk_connect_unix(sock, path);
+  int res = sk_connect_unix(sock, path, pathlen);
   DBG(L_TRACE "WG: socket %d %d %s", res, sock->fd, path);
   if (res < 0)
     {
diff --git a/sysdep/unix/wg_user.h b/sysdep/unix/wg_user.h
index a5e4251a..5bd9a41a 100644
--- a/sysdep/unix/wg_user.h
+++ b/sysdep/unix/wg_user.h
@@ -3,7 +3,9 @@
 
 #include "sysdep/config.h"
 
+#ifndef SOCKET_PATH
 #define SOCKET_PATH PATH_RUNSTATEDIR "/wireguard/"
+#endif /* SOCKET_PATH */
 
 struct pool;
 struct wg_device;
-- 
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