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-rw-r--r--ping.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/ping.c b/ping.c
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+/*
+ * 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) 2002-2005 OpenVPN Solutions LLC <info@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
+ */
+
+#ifdef WIN32
+#include "config-win32.h"
+#else
+#include "config.h"
+#endif
+
+#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);
+ dmsg (D_PACKET_CONTENT, "SENT PING");
+}