Imported Upstream version 2.2.1upstream/2.2.1

1 files changed, 92 insertions, 0 deletions

diff --git a/ping.c b/ping.c
new file mode 100644
index 0000000..191ad74
--- /dev/null
+++ b/ping.c
@@ -0,0 +1,92 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "syshead.h"
+
+#include "ping.h"
+
+#include "memdbg.h"
+
+#include "ping-inline.h"
+
+/*
+ * This random string identifies an OpenVPN ping packet.
+ * It should be of sufficient length and randomness
+ * so as not to collide with other tunnel data.
+ *
+ * PING_STRING_SIZE must be sizeof (ping_string)
+ */
+const uint8_t ping_string[] = {
+  0x2a, 0x18, 0x7b, 0xf3, 0x64, 0x1e, 0xb4, 0xcb,
+  0x07, 0xed, 0x2d, 0x0a, 0x98, 0x1f, 0xc7, 0x48
+};
+
+/*
+ * Should we exit or restart due to ping (or other authenticated packet)
+ * not received in n seconds?
+ */
+void
+check_ping_restart_dowork (struct context *c)
+{
+  struct gc_arena gc = gc_new ();
+  switch (c->options.ping_rec_timeout_action)
+    {
+    case PING_EXIT:
+      msg (M_INFO, "%sInactivity timeout (--ping-exit), exiting",
+	   format_common_name (c, &gc));
+      c->sig->signal_received = SIGTERM;
+      c->sig->signal_text = "ping-exit";
+      break;
+    case PING_RESTART:
+      msg (M_INFO, "%sInactivity timeout (--ping-restart), restarting",
+	   format_common_name (c, &gc));
+      c->sig->signal_received = SIGUSR1; /* SOFT-SIGUSR1 -- Ping Restart */
+      c->sig->signal_text = "ping-restart";
+      break;
+    default:
+      ASSERT (0);
+    }
+  gc_free (&gc);
+}
+
+/*
+ * Should we ping the remote?
+ */
+void
+check_ping_send_dowork (struct context *c)
+{
+  c->c2.buf = c->c2.buffers->aux_buf;
+  ASSERT (buf_init (&c->c2.buf, FRAME_HEADROOM (&c->c2.frame)));
+  ASSERT (buf_safe (&c->c2.buf, MAX_RW_SIZE_TUN (&c->c2.frame)));
+  ASSERT (buf_write (&c->c2.buf, ping_string, sizeof (ping_string)));
+
+  /*
+   * We will treat the ping like any other outgoing packet,
+   * encrypt, sign, etc.
+   */
+  encrypt_sign (c, true);
+  /* Set length to 0, so it won't be counted as activity */
+  c->c2.buf.len = 0;
+  dmsg (D_PING, "SENT PING");
+}