62c1a38e52
something that can't happen happens or when everyone needs to know. ERRORs are only logged when something unexpected happens.
593 lines
16 KiB
C
593 lines
16 KiB
C
/*-
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* Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: deflate.c,v 1.9 1998/06/15 19:06:39 brian Exp $
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <zlib.h>
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#include "mbuf.h"
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#include "log.h"
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#include "timer.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "deflate.h"
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/* Our state */
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struct deflate_state {
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u_short seqno;
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int uncomp_rec;
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int winsize;
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z_stream cx;
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};
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static char garbage[10];
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static u_char EMPTY_BLOCK[4] = { 0x00, 0x00, 0xff, 0xff };
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#define DEFLATE_CHUNK_LEN 1024 /* Allocate mbufs this size */
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static void
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DeflateResetOutput(void *v)
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{
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struct deflate_state *state = (struct deflate_state *)v;
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state->seqno = 0;
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state->uncomp_rec = 0;
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deflateReset(&state->cx);
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log_Printf(LogCCP, "Deflate: Output channel reset\n");
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}
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static int
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DeflateOutput(void *v, struct ccp *ccp, struct link *l, int pri, u_short proto,
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struct mbuf *mp)
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{
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struct deflate_state *state = (struct deflate_state *)v;
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u_char *wp, *rp;
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int olen, ilen, len, res, flush;
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struct mbuf *mo_head, *mo, *mi_head, *mi;
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ilen = mbuf_Length(mp);
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log_Printf(LogDEBUG, "DeflateOutput: Proto %02x (%d bytes)\n", proto, ilen);
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log_DumpBp(LogDEBUG, "DeflateOutput: Compress packet:", mp);
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/* Stuff the protocol in front of the input */
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mi_head = mi = mbuf_Alloc(2, MB_HDLCOUT);
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mi->next = mp;
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rp = MBUF_CTOP(mi);
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if (proto < 0x100) { /* Compress the protocol */
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rp[0] = proto & 0377;
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mi->cnt = 1;
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} else { /* Don't compress the protocol */
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rp[0] = proto >> 8;
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rp[1] = proto & 0377;
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mi->cnt = 2;
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}
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/* Allocate the initial output mbuf */
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mo_head = mo = mbuf_Alloc(DEFLATE_CHUNK_LEN, MB_HDLCOUT);
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mo->cnt = 2;
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wp = MBUF_CTOP(mo);
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*wp++ = state->seqno >> 8;
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*wp++ = state->seqno & 0377;
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log_Printf(LogDEBUG, "DeflateOutput: Seq %d\n", state->seqno);
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state->seqno++;
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/* Set up the deflation context */
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state->cx.next_out = wp;
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state->cx.avail_out = DEFLATE_CHUNK_LEN - 2;
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state->cx.next_in = MBUF_CTOP(mi);
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state->cx.avail_in = mi->cnt;
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flush = Z_NO_FLUSH;
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olen = 0;
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while (1) {
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if ((res = deflate(&state->cx, flush)) != Z_OK) {
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if (res == Z_STREAM_END)
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break; /* Done */
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log_Printf(LogWARN, "DeflateOutput: deflate returned %d (%s)\n",
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res, state->cx.msg ? state->cx.msg : "");
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mbuf_Free(mo_head);
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mbuf_FreeSeg(mi_head);
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state->seqno--;
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return 1; /* packet dropped */
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}
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if (flush == Z_SYNC_FLUSH && state->cx.avail_out != 0)
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break;
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if (state->cx.avail_in == 0 && mi->next != NULL) {
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mi = mi->next;
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state->cx.next_in = MBUF_CTOP(mi);
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state->cx.avail_in = mi->cnt;
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if (mi->next == NULL)
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flush = Z_SYNC_FLUSH;
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}
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if (state->cx.avail_out == 0) {
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mo->next = mbuf_Alloc(DEFLATE_CHUNK_LEN, MB_HDLCOUT);
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olen += (mo->cnt = DEFLATE_CHUNK_LEN);
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mo = mo->next;
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mo->cnt = 0;
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state->cx.next_out = MBUF_CTOP(mo);
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state->cx.avail_out = DEFLATE_CHUNK_LEN;
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}
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}
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olen += (mo->cnt = DEFLATE_CHUNK_LEN - state->cx.avail_out);
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olen -= 4; /* exclude the trailing EMPTY_BLOCK */
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/*
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* If the output packet (including seqno and excluding the EMPTY_BLOCK)
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* got bigger, send the original.
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*/
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if (olen >= ilen) {
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mbuf_Free(mo_head);
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mbuf_FreeSeg(mi_head);
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log_Printf(LogDEBUG, "DeflateOutput: %d => %d: Uncompressible (0x%04x)\n",
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ilen, olen, proto);
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ccp->uncompout += ilen;
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ccp->compout += ilen; /* We measure this stuff too */
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return 0;
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}
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mbuf_Free(mi_head);
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/*
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* Lose the last four bytes of our output.
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* XXX: We should probably assert that these are the same as the
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* contents of EMPTY_BLOCK.
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*/
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for (mo = mo_head, len = mo->cnt; len < olen; mo = mo->next, len += mo->cnt)
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;
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mo->cnt -= len - olen;
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if (mo->next != NULL) {
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mbuf_Free(mo->next);
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mo->next = NULL;
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}
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ccp->uncompout += ilen;
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ccp->compout += olen;
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log_Printf(LogDEBUG, "DeflateOutput: %d => %d bytes, proto 0x%04x\n",
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ilen, olen, proto);
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hdlc_Output(l, PRI_NORMAL, ccp_Proto(ccp), mo_head);
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return 1;
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}
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static void
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DeflateResetInput(void *v)
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{
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struct deflate_state *state = (struct deflate_state *)v;
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state->seqno = 0;
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state->uncomp_rec = 0;
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inflateReset(&state->cx);
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log_Printf(LogCCP, "Deflate: Input channel reset\n");
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}
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static struct mbuf *
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DeflateInput(void *v, struct ccp *ccp, u_short *proto, struct mbuf *mi)
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{
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struct deflate_state *state = (struct deflate_state *)v;
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struct mbuf *mo, *mo_head, *mi_head;
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u_char *wp;
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int ilen, olen;
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int seq, flush, res, first;
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u_char hdr[2];
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log_DumpBp(LogDEBUG, "DeflateInput: Decompress packet:", mi);
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mi_head = mi = mbuf_Read(mi, hdr, 2);
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ilen = 2;
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/* Check the sequence number. */
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seq = (hdr[0] << 8) + hdr[1];
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log_Printf(LogDEBUG, "DeflateInput: Seq %d\n", seq);
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if (seq != state->seqno) {
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if (seq <= state->uncomp_rec)
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/*
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* So the peer's started at zero again - fine ! If we're wrong,
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* inflate() will fail. This is better than getting into a loop
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* trying to get a ResetReq to a busy sender.
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*/
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state->seqno = seq;
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else {
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log_Printf(LogWARN, "DeflateInput: Seq error: Got %d, expected %d\n",
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seq, state->seqno);
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mbuf_Free(mi_head);
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ccp_SendResetReq(&ccp->fsm);
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return NULL;
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}
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}
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state->seqno++;
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state->uncomp_rec = 0;
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/* Allocate an output mbuf */
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mo_head = mo = mbuf_Alloc(DEFLATE_CHUNK_LEN, MB_IPIN);
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/* Our proto starts with 0 if it's compressed */
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wp = MBUF_CTOP(mo);
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wp[0] = '\0';
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/*
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* We set avail_out to 1 initially so we can look at the first
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* byte of the output and decide whether we have a compressed
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* proto field.
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*/
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state->cx.next_in = MBUF_CTOP(mi);
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state->cx.avail_in = mi->cnt;
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state->cx.next_out = wp + 1;
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state->cx.avail_out = 1;
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ilen += mi->cnt;
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flush = mi->next ? Z_NO_FLUSH : Z_SYNC_FLUSH;
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first = 1;
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olen = 0;
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while (1) {
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if ((res = inflate(&state->cx, flush)) != Z_OK) {
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if (res == Z_STREAM_END)
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break; /* Done */
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log_Printf(LogWARN, "DeflateInput: inflate returned %d (%s)\n",
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res, state->cx.msg ? state->cx.msg : "");
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mbuf_Free(mo_head);
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mbuf_Free(mi);
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ccp_SendResetReq(&ccp->fsm);
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return NULL;
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}
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if (flush == Z_SYNC_FLUSH && state->cx.avail_out != 0)
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break;
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if (state->cx.avail_in == 0 && mi && (mi = mbuf_FreeSeg(mi)) != NULL) {
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/* underflow */
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state->cx.next_in = MBUF_CTOP(mi);
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ilen += (state->cx.avail_in = mi->cnt);
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if (mi->next == NULL)
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flush = Z_SYNC_FLUSH;
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}
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if (state->cx.avail_out == 0) {
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/* overflow */
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if (first) {
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if (!(wp[1] & 1)) {
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/* 2 byte proto, shuffle it back in output */
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wp[0] = wp[1];
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state->cx.next_out--;
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state->cx.avail_out = DEFLATE_CHUNK_LEN-1;
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} else
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state->cx.avail_out = DEFLATE_CHUNK_LEN-2;
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first = 0;
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} else {
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olen += (mo->cnt = DEFLATE_CHUNK_LEN);
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mo->next = mbuf_Alloc(DEFLATE_CHUNK_LEN, MB_IPIN);
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mo = mo->next;
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state->cx.next_out = MBUF_CTOP(mo);
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state->cx.avail_out = DEFLATE_CHUNK_LEN;
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}
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}
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}
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if (mi != NULL)
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mbuf_Free(mi);
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if (first) {
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log_Printf(LogWARN, "DeflateInput: Length error\n");
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mbuf_Free(mo_head);
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ccp_SendResetReq(&ccp->fsm);
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return NULL;
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}
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olen += (mo->cnt = DEFLATE_CHUNK_LEN - state->cx.avail_out);
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*proto = ((u_short)wp[0] << 8) | wp[1];
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mo_head->offset += 2;
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mo_head->cnt -= 2;
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olen -= 2;
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ccp->compin += ilen;
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ccp->uncompin += olen;
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log_Printf(LogDEBUG, "DeflateInput: %d => %d bytes, proto 0x%04x\n",
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ilen, olen, *proto);
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/*
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* Simulate an EMPTY_BLOCK so that our dictionary stays in sync.
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* The peer will have silently removed this!
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*/
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state->cx.next_out = garbage;
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state->cx.avail_out = sizeof garbage;
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state->cx.next_in = EMPTY_BLOCK;
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state->cx.avail_in = sizeof EMPTY_BLOCK;
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inflate(&state->cx, Z_SYNC_FLUSH);
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return mo_head;
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}
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static void
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DeflateDictSetup(void *v, struct ccp *ccp, u_short proto, struct mbuf *mi)
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{
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struct deflate_state *state = (struct deflate_state *)v;
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int res, flush, expect_error;
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u_char *rp;
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struct mbuf *mi_head;
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short len;
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log_Printf(LogDEBUG, "DeflateDictSetup: Got seq %d\n", state->seqno);
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/*
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* Stuff an ``uncompressed data'' block header followed by the
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* protocol in front of the input
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*/
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mi_head = mbuf_Alloc(7, MB_HDLCOUT);
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mi_head->next = mi;
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len = mbuf_Length(mi);
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mi = mi_head;
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rp = MBUF_CTOP(mi);
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if (proto < 0x100) { /* Compress the protocol */
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rp[5] = proto & 0377;
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mi->cnt = 6;
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len++;
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} else { /* Don't compress the protocol */
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rp[5] = proto >> 8;
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rp[6] = proto & 0377;
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mi->cnt = 7;
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len += 2;
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}
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rp[0] = 0x80; /* BITS: 100xxxxx */
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rp[1] = len & 0377; /* The length */
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rp[2] = len >> 8;
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rp[3] = (~len) & 0377; /* One's compliment of the length */
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rp[4] = (~len) >> 8;
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state->cx.next_in = rp;
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state->cx.avail_in = mi->cnt;
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state->cx.next_out = garbage;
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state->cx.avail_out = sizeof garbage;
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flush = Z_NO_FLUSH;
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expect_error = 0;
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while (1) {
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if ((res = inflate(&state->cx, flush)) != Z_OK) {
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if (res == Z_STREAM_END)
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break; /* Done */
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if (expect_error && res == Z_BUF_ERROR)
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break;
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log_Printf(LogERROR, "DeflateDictSetup: inflate returned %d (%s)\n",
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res, state->cx.msg ? state->cx.msg : "");
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log_Printf(LogERROR, "DeflateDictSetup: avail_in %d, avail_out %d\n",
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state->cx.avail_in, state->cx.avail_out);
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ccp_SendResetReq(&ccp->fsm);
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mbuf_FreeSeg(mi_head); /* lose our allocated ``head'' buf */
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return;
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}
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if (flush == Z_SYNC_FLUSH && state->cx.avail_out != 0)
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break;
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if (state->cx.avail_in == 0 && mi && (mi = mi->next) != NULL) {
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/* underflow */
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state->cx.next_in = MBUF_CTOP(mi);
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state->cx.avail_in = mi->cnt;
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if (mi->next == NULL)
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flush = Z_SYNC_FLUSH;
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}
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if (state->cx.avail_out == 0) {
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if (state->cx.avail_in == 0)
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/*
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* This seems to be a bug in libz ! If inflate() finished
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* with 0 avail_in and 0 avail_out *and* this is the end of
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* our input *and* inflate() *has* actually written all the
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* output it's going to, it *doesn't* return Z_STREAM_END !
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* When we subsequently call it with no more input, it gives
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* us Z_BUF_ERROR :-( It seems pretty safe to ignore this
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* error (the dictionary seems to stay in sync). In the worst
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* case, we'll drop the next compressed packet and do a
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* CcpReset() then.
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*/
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expect_error = 1;
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/* overflow */
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state->cx.next_out = garbage;
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state->cx.avail_out = sizeof garbage;
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}
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}
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ccp->compin += len;
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ccp->uncompin += len;
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state->seqno++;
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state->uncomp_rec++;
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mbuf_FreeSeg(mi_head); /* lose our allocated ``head'' buf */
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}
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static const char *
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DeflateDispOpts(struct lcp_opt *o)
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{
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static char disp[7]; /* Must be used immediately */
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sprintf(disp, "win %d", (o->data[0]>>4) + 8);
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return disp;
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}
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static void
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DeflateInitOptsOutput(struct lcp_opt *o, const struct ccp_config *cfg)
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{
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o->len = 4;
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o->data[0] = ((cfg->deflate.out.winsize - 8) << 4) + 8;
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o->data[1] = '\0';
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}
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static int
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DeflateSetOptsOutput(struct lcp_opt *o)
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{
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if (o->len != 4 || (o->data[0] & 15) != 8 || o->data[1] != '\0')
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return MODE_REJ;
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if ((o->data[0] >> 4) + 8 > 15) {
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o->data[0] = ((15 - 8) << 4) + 8;
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return MODE_NAK;
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}
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return MODE_ACK;
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}
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static int
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DeflateSetOptsInput(struct lcp_opt *o, const struct ccp_config *cfg)
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{
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int want;
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if (o->len != 4 || (o->data[0] & 15) != 8 || o->data[1] != '\0')
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return MODE_REJ;
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want = (o->data[0] >> 4) + 8;
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if (cfg->deflate.in.winsize == 0) {
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if (want < 8 || want > 15) {
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o->data[0] = ((15 - 8) << 4) + 8;
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}
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} else if (want != cfg->deflate.in.winsize) {
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o->data[0] = ((cfg->deflate.in.winsize - 8) << 4) + 8;
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return MODE_NAK;
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}
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return MODE_ACK;
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}
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static void *
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DeflateInitInput(struct lcp_opt *o)
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{
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struct deflate_state *state;
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state = (struct deflate_state *)malloc(sizeof(struct deflate_state));
|
|
if (state != NULL) {
|
|
state->winsize = (o->data[0] >> 4) + 8;
|
|
state->cx.zalloc = NULL;
|
|
state->cx.opaque = NULL;
|
|
state->cx.zfree = NULL;
|
|
state->cx.next_out = NULL;
|
|
if (inflateInit2(&state->cx, -state->winsize) == Z_OK)
|
|
DeflateResetInput(state);
|
|
else {
|
|
free(state);
|
|
state = NULL;
|
|
}
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
static void *
|
|
DeflateInitOutput(struct lcp_opt *o)
|
|
{
|
|
struct deflate_state *state;
|
|
|
|
state = (struct deflate_state *)malloc(sizeof(struct deflate_state));
|
|
if (state != NULL) {
|
|
state->winsize = (o->data[0] >> 4) + 8;
|
|
state->cx.zalloc = NULL;
|
|
state->cx.opaque = NULL;
|
|
state->cx.zfree = NULL;
|
|
state->cx.next_in = NULL;
|
|
if (deflateInit2(&state->cx, Z_DEFAULT_COMPRESSION, 8,
|
|
-state->winsize, 8, Z_DEFAULT_STRATEGY) == Z_OK)
|
|
DeflateResetOutput(state);
|
|
else {
|
|
free(state);
|
|
state = NULL;
|
|
}
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
static void
|
|
DeflateTermInput(void *v)
|
|
{
|
|
struct deflate_state *state = (struct deflate_state *)v;
|
|
|
|
inflateEnd(&state->cx);
|
|
free(state);
|
|
}
|
|
|
|
static void
|
|
DeflateTermOutput(void *v)
|
|
{
|
|
struct deflate_state *state = (struct deflate_state *)v;
|
|
|
|
deflateEnd(&state->cx);
|
|
free(state);
|
|
}
|
|
|
|
const struct ccp_algorithm PppdDeflateAlgorithm = {
|
|
TY_PPPD_DEFLATE, /* pppd (wrongly) expects this ``type'' field */
|
|
CCP_NEG_DEFLATE24,
|
|
DeflateDispOpts,
|
|
{
|
|
DeflateSetOptsInput,
|
|
DeflateInitInput,
|
|
DeflateTermInput,
|
|
DeflateResetInput,
|
|
DeflateInput,
|
|
DeflateDictSetup
|
|
},
|
|
{
|
|
DeflateInitOptsOutput,
|
|
DeflateSetOptsOutput,
|
|
DeflateInitOutput,
|
|
DeflateTermOutput,
|
|
DeflateResetOutput,
|
|
DeflateOutput
|
|
},
|
|
};
|
|
|
|
const struct ccp_algorithm DeflateAlgorithm = {
|
|
TY_DEFLATE, /* rfc 1979 */
|
|
CCP_NEG_DEFLATE,
|
|
DeflateDispOpts,
|
|
{
|
|
DeflateSetOptsInput,
|
|
DeflateInitInput,
|
|
DeflateTermInput,
|
|
DeflateResetInput,
|
|
DeflateInput,
|
|
DeflateDictSetup
|
|
},
|
|
{
|
|
DeflateInitOptsOutput,
|
|
DeflateSetOptsOutput,
|
|
DeflateInitOutput,
|
|
DeflateTermOutput,
|
|
DeflateResetOutput,
|
|
DeflateOutput
|
|
},
|
|
};
|