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authorAlberto Gonzalez Iniesta <agi@inittab.org>2016-11-21 09:37:33 +0100
committerAlberto Gonzalez Iniesta <agi@inittab.org>2016-11-21 09:37:33 +0100
commit20c8675ba46bda97330a4117c459a59a9f1c465e (patch)
treed888c714fb61947dd79dc44b64a4aaae2f70bfb7 /src/openvpn/compstub.c
parentffca24bed7a03d95585ad02278667abe75d8b272 (diff)
New upstream version 2.4~beta1upstream/2.4_beta1
Diffstat (limited to 'src/openvpn/compstub.c')
-rw-r--r--src/openvpn/compstub.c169
1 files changed, 169 insertions, 0 deletions
diff --git a/src/openvpn/compstub.c b/src/openvpn/compstub.c
new file mode 100644
index 0000000..9c6aad2
--- /dev/null
+++ b/src/openvpn/compstub.c
@@ -0,0 +1,169 @@
+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2012 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
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#include "syshead.h"
+
+#if defined(USE_COMP)
+
+#include "comp.h"
+#include "error.h"
+#include "otime.h"
+
+#include "memdbg.h"
+
+static void
+stub_compress_init (struct compress_context *compctx)
+{
+}
+
+static void
+stub_compress_uninit (struct compress_context *compctx)
+{
+}
+
+static void
+stub_compress (struct buffer *buf, struct buffer work,
+ struct compress_context *compctx,
+ const struct frame* frame)
+{
+ if (buf->len <= 0)
+ return;
+ if (compctx->flags & COMP_F_SWAP)
+ {
+ uint8_t *head = BPTR (buf);
+ uint8_t *tail = BEND (buf);
+ ASSERT (buf_safe (buf, 1));
+ ++buf->len;
+
+ /* move head byte of payload to tail */
+ *tail = *head;
+ *head = NO_COMPRESS_BYTE_SWAP;
+ }
+ else
+ {
+ uint8_t *header = buf_prepend (buf, 1);
+ *header = NO_COMPRESS_BYTE;
+ }
+}
+
+static void
+stub_decompress (struct buffer *buf, struct buffer work,
+ struct compress_context *compctx,
+ const struct frame* frame)
+{
+ uint8_t c;
+ if (buf->len <= 0)
+ return;
+ if (compctx->flags & COMP_F_SWAP)
+ {
+ uint8_t *head = BPTR (buf);
+ c = *head;
+ --buf->len;
+ *head = *BEND (buf);
+ if (c != NO_COMPRESS_BYTE_SWAP)
+ {
+ dmsg (D_COMP_ERRORS, "Bad compression stub (swap) decompression header byte: %d", c);
+ buf->len = 0;
+ }
+ }
+ else
+ {
+ c = *BPTR (buf);
+ ASSERT (buf_advance (buf, 1));
+ if (c != NO_COMPRESS_BYTE)
+ {
+ dmsg (D_COMP_ERRORS, "Bad compression stub decompression header byte: %d", c);
+ buf->len = 0;
+ }
+ }
+}
+
+
+static void
+stubv2_compress (struct buffer *buf, struct buffer work,
+ struct compress_context *compctx,
+ const struct frame* frame)
+{
+ if (buf->len <= 0)
+ return;
+
+ compv2_escape_data_ifneeded (buf);
+}
+
+static void
+stubv2_decompress (struct buffer *buf, struct buffer work,
+ struct compress_context *compctx,
+ const struct frame* frame)
+{
+ if (buf->len <= 0)
+ return;
+
+ uint8_t *head = BPTR (buf);
+
+ /* no compression or packet to short*/
+ if (head[0] != COMP_ALGV2_INDICATOR_BYTE)
+ return;
+
+ /* compression header (0x50) is present */
+ buf_advance(buf, 1);
+
+ /* Packet buffer too short (only 1 byte) */
+ if (buf->len <= 0)
+ return;
+
+ head = BPTR (buf);
+ buf_advance(buf, 1);
+
+ if (head[0] != COMP_ALGV2_UNCOMPRESSED_BYTE) {
+ dmsg (D_COMP_ERRORS, "Bad compression stubv2 decompression header byte: %d", *head);
+ buf->len = 0;
+ return;
+ }
+}
+
+const struct compress_alg compv2_stub_alg = {
+ "stubv2",
+ stub_compress_init,
+ stub_compress_uninit,
+ stubv2_compress,
+ stubv2_decompress
+};
+
+const struct compress_alg comp_stub_alg = {
+ "stub",
+ stub_compress_init,
+ stub_compress_uninit,
+ stub_compress,
+ stub_decompress
+};
+
+#else
+static void dummy(void) {}
+#endif /* USE_STUB */