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Diffstat (limited to 'src/openvpn/snappy.c')
| -rw-r--r-- | src/openvpn/snappy.c | 189 |
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 */ |