diff options
Diffstat (limited to 'openvpn/src/openvpn/lzo.c')
-rw-r--r-- | openvpn/src/openvpn/lzo.c | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/openvpn/src/openvpn/lzo.c b/openvpn/src/openvpn/lzo.c deleted file mode 100644 index daa02ed0..00000000 --- a/openvpn/src/openvpn/lzo.c +++ /dev/null @@ -1,258 +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) 2002-2010 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 - */ - -/** - * @file Data Channel Compression module function definitions. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#elif defined(_MSC_VER) -#include "config-msvc.h" -#endif - -#include "syshead.h" - -#if defined(ENABLE_LZO) - -#include "comp.h" -#include "error.h" -#include "otime.h" - -#include "memdbg.h" - -/* Initial command byte to tell our peer if we compressed */ -#define LZO_COMPRESS_BYTE 0x66 - -/** - * Perform adaptive compression housekeeping. - * - * @param ac the adaptive compression state structure. - * - * @return - */ -static bool -lzo_adaptive_compress_test (struct lzo_adaptive_compress *ac) -{ - const bool save = ac->compress_state; - const time_t local_now = now; - - if (!ac->compress_state) - { - if (local_now >= ac->next) - { - if (ac->n_total > AC_MIN_BYTES - && (ac->n_total - ac->n_comp) < (ac->n_total / (100 / AC_SAVE_PCT))) - { - ac->compress_state = true; - ac->next = local_now + AC_OFF_SEC; - } - else - { - ac->next = local_now + AC_SAMP_SEC; - } - dmsg (D_COMP, "lzo_adaptive_compress_test: comp=%d total=%d", ac->n_comp, ac->n_total); - ac->n_total = ac->n_comp = 0; - } - } - else - { - if (local_now >= ac->next) - { - ac->next = local_now + AC_SAMP_SEC; - ac->n_total = ac->n_comp = 0; - ac->compress_state = false; - } - } - - if (ac->compress_state != save) - dmsg (D_COMP_LOW, "Adaptive compression state %s", (ac->compress_state ? "OFF" : "ON")); - - return !ac->compress_state; -} - -static inline void -lzo_adaptive_compress_data (struct lzo_adaptive_compress *ac, int n_total, int n_comp) -{ - ac->n_total += n_total; - ac->n_comp += n_comp; -} - -static void -lzo_compress_init (struct compress_context *compctx) -{ - msg (D_INIT_MEDIUM, "LZO compression initializing"); - ASSERT(!(compctx->flags & COMP_F_SWAP)); - compctx->wu.lzo.wmem_size = LZO_WORKSPACE; - if (lzo_init () != LZO_E_OK) - msg (M_FATAL, "Cannot initialize LZO compression library"); - compctx->wu.lzo.wmem = (lzo_voidp) lzo_malloc (compctx->wu.lzo.wmem_size); - check_malloc_return (compctx->wu.lzo.wmem); -} - -static void -lzo_compress_uninit (struct compress_context *compctx) -{ - lzo_free (compctx->wu.lzo.wmem); - compctx->wu.lzo.wmem = NULL; -} - -static inline bool -lzo_compression_enabled (struct compress_context *compctx) -{ - if (compctx->flags & COMP_F_ASYM) - return false; - else - { - if (compctx->flags & COMP_F_ADAPTIVE) - return lzo_adaptive_compress_test (&compctx->wu.lzo.ac); - else - return true; - } -} - -static void -lzo_compress (struct buffer *buf, struct buffer work, - struct compress_context *compctx, - const struct frame* frame) -{ - lzo_uint zlen = 0; - int err; - bool compressed = false; - - if (buf->len <= 0) - return; - - /* - * In order to attempt compression, length must be at least COMPRESS_THRESHOLD, - * and our adaptive level must give the OK. - */ - if (buf->len >= COMPRESS_THRESHOLD && lzo_compression_enabled (compctx)) - { - const size_t ps = PAYLOAD_SIZE (frame); - ASSERT (buf_init (&work, FRAME_HEADROOM (frame))); - ASSERT (buf_safe (&work, ps + COMP_EXTRA_BUFFER (ps))); - - if (buf->len > ps) - { - dmsg (D_COMP_ERRORS, "LZO compression buffer overflow"); - buf->len = 0; - return; - } - - err = LZO_COMPRESS (BPTR (buf), BLEN (buf), BPTR (&work), &zlen, compctx->wu.lzo.wmem); - if (err != LZO_E_OK) - { - dmsg (D_COMP_ERRORS, "LZO compression error: %d", err); - buf->len = 0; - return; - } - - ASSERT (buf_safe (&work, zlen)); - work.len = zlen; - compressed = true; - - dmsg (D_COMP, "LZO compress %d -> %d", buf->len, work.len); - compctx->pre_compress += buf->len; - compctx->post_compress += work.len; - - /* tell adaptive level about our success or lack thereof in getting any size reduction */ - if (compctx->flags & COMP_F_ADAPTIVE) - lzo_adaptive_compress_data (&compctx->wu.lzo.ac, buf->len, work.len); - } - - /* did compression save us anything ? */ - if (compressed && work.len < buf->len) - { - uint8_t *header = buf_prepend (&work, 1); - *header = LZO_COMPRESS_BYTE; - *buf = work; - } - else - { - uint8_t *header = buf_prepend (buf, 1); - *header = NO_COMPRESS_BYTE; - } -} - -static void -lzo_decompress (struct buffer *buf, struct buffer work, - struct compress_context *compctx, - const struct frame* frame) -{ - lzo_uint zlen = EXPANDED_SIZE (frame); - int err; - uint8_t c; /* flag indicating whether or not our peer compressed */ - - if (buf->len <= 0) - return; - - ASSERT (buf_init (&work, FRAME_HEADROOM (frame))); - - c = *BPTR (buf); - ASSERT (buf_advance (buf, 1)); - - if (c == LZO_COMPRESS_BYTE) /* packet was compressed */ - { - ASSERT (buf_safe (&work, zlen)); - err = LZO_DECOMPRESS (BPTR (buf), BLEN (buf), BPTR (&work), &zlen, - compctx->wu.lzo.wmem); - if (err != LZO_E_OK) - { - dmsg (D_COMP_ERRORS, "LZO decompression error: %d", err); - buf->len = 0; - return; - } - - ASSERT (buf_safe (&work, zlen)); - work.len = zlen; - - dmsg (D_COMP, "LZO 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) /* packet was not compressed */ - { - ; - } - else - { - dmsg (D_COMP_ERRORS, "Bad LZO decompression header byte: %d", c); - buf->len = 0; - } -} - -const struct compress_alg lzo_alg = { - "lzo", - lzo_compress_init, - lzo_compress_uninit, - lzo_compress, - lzo_decompress -}; - -#else -static void dummy(void) {} -#endif /* ENABLE_LZO */ |