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authorGert Doering <gert@greenie.muc.de>2015-10-10 18:34:49 +0200
committerGert Doering <gert@greenie.muc.de>2015-10-11 10:25:06 +0200
commit9403e3f4b510fbc4187044f31be8f7dccbde1cf1 (patch)
treee4d0fe330a98c29b9ead343ec854891d849e3852 /src/openvpn/snappy.c
parentc67acea173dc9ee37220f5b9ff14ede081181992 (diff)
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Remove support for snappy compression.
LZ4 is using less CPU at similar performance, and it is easier to build and support for binary installs (as it does not require C++ and a C++ runtime). Since it was never supported in any formally released OpenVPN version, just drop it again. This leaves in the compression opcode for Snappy for documentation purposes. trac #617 Signed-off-by: Gert Doering <gert@greenie.muc.de> Acked-by: Arne Schwabe <arne@rfc2549.org> Message-Id: <1444494889-28925-1-git-send-email-gert@greenie.muc.de> URL: http://article.gmane.org/gmane.network.openvpn.devel/10251
Diffstat (limited to 'src/openvpn/snappy.c')
-rw-r--r--src/openvpn/snappy.c189
1 files changed, 0 insertions, 189 deletions
diff --git a/src/openvpn/snappy.c b/src/openvpn/snappy.c
deleted file mode 100644
index 24440ba..0000000
--- a/src/openvpn/snappy.c
+++ /dev/null
@@ -1,189 +0,0 @@
-/*
- * 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(ENABLE_SNAPPY)
-
-#include "snappy-c.h"
-
-#include "comp.h"
-#include "error.h"
-#include "otime.h"
-
-#include "memdbg.h"
-
-/* Initial command byte to tell our peer if we compressed */
-#define SNAPPY_COMPRESS_BYTE 0x68
-
-static void
-snap_compress_init (struct compress_context *compctx)
-{
- msg (D_INIT_MEDIUM, "Snappy compression initializing");
- ASSERT(compctx->flags & COMP_F_SWAP);
-}
-
-static void
-snap_compress_uninit (struct compress_context *compctx)
-{
-}
-
-static void
-snap_compress (struct buffer *buf, struct buffer work,
- struct compress_context *compctx,
- const struct frame* frame)
-{
- snappy_status status;
- bool compressed = false;
-
- if (buf->len <= 0)
- return;
-
- /*
- * In order to attempt compression, length must be at least COMPRESS_THRESHOLD.
- */
- if (buf->len >= COMPRESS_THRESHOLD)
- {
- const size_t ps = PAYLOAD_SIZE (frame);
- size_t zlen = ps + COMP_EXTRA_BUFFER (ps);
-
- ASSERT (buf_init (&work, FRAME_HEADROOM (frame)));
- ASSERT (buf_safe (&work, zlen));
-
- if (buf->len > ps)
- {
- dmsg (D_COMP_ERRORS, "Snappy compression buffer overflow");
- buf->len = 0;
- return;
- }
-
- status = snappy_compress((const char *)BPTR(buf), (size_t)BLEN(buf), (char *)BPTR(&work), &zlen);
- if (status != SNAPPY_OK)
- {
- dmsg (D_COMP_ERRORS, "Snappy compression error: %d", status);
- buf->len = 0;
- return;
- }
-
- ASSERT (buf_safe (&work, zlen));
- work.len = zlen;
- compressed = true;
-
- dmsg (D_COMP, "Snappy compress %d -> %d", buf->len, work.len);
- compctx->pre_compress += buf->len;
- compctx->post_compress += work.len;
- }
-
- /* did compression save us anything? */
- {
- uint8_t comp_head_byte = NO_COMPRESS_BYTE_SWAP;
- if (compressed && work.len < buf->len)
- {
- *buf = work;
- comp_head_byte = SNAPPY_COMPRESS_BYTE;
- }
-
- {
- 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 = comp_head_byte;
- }
- }
-}
-
-static void
-snap_decompress (struct buffer *buf, struct buffer work,
- struct compress_context *compctx,
- const struct frame* frame)
-{
- size_t zlen = EXPANDED_SIZE (frame);
- snappy_status status;
- uint8_t c; /* flag indicating whether or not our peer compressed */
-
- if (buf->len <= 0)
- return;
-
- ASSERT (buf_init (&work, FRAME_HEADROOM (frame)));
-
- /* do unframing/swap (assumes buf->len > 0) */
- {
- uint8_t *head = BPTR (buf);
- c = *head;
- --buf->len;
- *head = *BEND (buf);
- }
-
- if (c == SNAPPY_COMPRESS_BYTE) /* packet was compressed */
- {
- ASSERT (buf_safe (&work, zlen));
- status = snappy_uncompress((const char *)BPTR(buf), (size_t)BLEN(buf), (char *)BPTR(&work), &zlen);
- if (status != SNAPPY_OK)
- {
- dmsg (D_COMP_ERRORS, "Snappy decompression error: %d", status);
- buf->len = 0;
- return;
- }
-
- ASSERT (buf_safe (&work, zlen));
- work.len = zlen;
-
- dmsg (D_COMP, "Snappy decompress %d -> %d", buf->len, work.len);
- compctx->pre_decompress += buf->len;
- compctx->post_decompress += work.len;
-
- *buf = work;
- }
- else if (c == NO_COMPRESS_BYTE_SWAP) /* packet was not compressed */
- {
- ;
- }
- else
- {
- dmsg (D_COMP_ERRORS, "Bad Snappy decompression header byte: %d", c);
- buf->len = 0;
- }
-}
-
-const struct compress_alg snappy_alg = {
- "snappy",
- snap_compress_init,
- snap_compress_uninit,
- snap_compress,
- snap_decompress
-};
-
-#else
-static void dummy(void) {}
-#endif /* ENABLE_SNAPPY */