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📄 Makefile(1.66 KB)
📄 Makefile.depend(435 B)
📄 README.changes(7.26 KB)
📄 README.nat(14.85 KB)
📄 acf.c(3.51 KB)
📄 acf.h(1.5 KB)
📄 arp.c(8.24 KB)
📄 arp.h(1.76 KB)
📄 async.c(5.39 KB)
📄 async.h(1.9 KB)
📄 auth.c(12.02 KB)
📄 auth.h(2.69 KB)
📄 bundle.c(56.37 KB)
📄 bundle.h(7.7 KB)
📄 cbcp.c(22.53 KB)
📄 cbcp.h(2.51 KB)
📄 ccp.c(23.33 KB)
📄 ccp.h(5.53 KB)
📄 chap.c(27 KB)
📄 chap.h(2.69 KB)
📄 chap_ms.c(12.22 KB)
📄 chap_ms.h(2.48 KB)
📄 chat.c(20.41 KB)
📄 chat.h(2.92 KB)
📄 command.c(101.76 KB)
📄 command.h(3.02 KB)
📄 datalink.c(42.89 KB)
📄 datalink.h(6.11 KB)
📄 deflate.c(15.89 KB)
📄 deflate.h(1.52 KB)
📄 defs.c(8.61 KB)
📄 defs.h(5.41 KB)
📄 descriptor.h(2.24 KB)
📄 ether.c(20.81 KB)
📄 ether.h(1.73 KB)
📄 exec.c(11.47 KB)
📄 exec.h(1.67 KB)
📄 filter.c(15.76 KB)
📄 filter.h(3.8 KB)
📄 fsm.c(31.01 KB)
📄 fsm.h(7.02 KB)
📄 hdlc.c(15.17 KB)
📄 hdlc.h(3.9 KB)
📄 i4b.h(1.73 KB)
📄 id.c(6.05 KB)
📄 id.h(3.01 KB)
📄 iface.c(22.41 KB)
📄 iface.h(2.97 KB)
📄 ip.c(30.21 KB)
📄 ip.h(2.09 KB)
📄 ipcp.c(42.99 KB)
📄 ipcp.h(5.14 KB)
📄 iplist.c(5.54 KB)
📄 iplist.h(1.99 KB)
📄 ipv6cp.c(21.9 KB)
📄 ipv6cp.h(3.26 KB)
📄 layer.h(1.97 KB)
📄 lcp.c(39.22 KB)
📄 lcp.h(6.3 KB)
📄 link.c(10.36 KB)
📄 link.h(3.42 KB)
📄 log.c(11.33 KB)
📄 log.h(4.14 KB)
📄 lqr.c(17.5 KB)
📄 lqr.h(3.31 KB)
📄 main.c(17.93 KB)
📄 main.h(1.6 KB)
📄 mbuf.c(10.02 KB)
📄 mbuf.h(4 KB)
📄 mp.c(33.66 KB)
📄 mp.h(4.87 KB)
📄 mppe.c(20.27 KB)
📄 mppe.h(1.57 KB)
📄 nat_cmd.c(15.37 KB)
📄 nat_cmd.h(1.88 KB)
📄 ncp.c(13.17 KB)
📄 ncp.h(4.36 KB)
📄 ncpaddr.c(23.06 KB)
📄 ncpaddr.h(4.63 KB)
📄 netgraph.c(20.65 KB)
📄 netgraph.h(1.72 KB)
📄 pap.c(8.83 KB)
📄 pap.h(1.78 KB)
📄 physical.c(29.01 KB)
📄 physical.h(6.5 KB)
📄 ppp.8(149.48 KB)
📄 ppp.conf(1.23 KB)
📄 pred.c(8.83 KB)
📄 pred.h(1.59 KB)
📄 probe.c(2.29 KB)
📄 probe.h(1.57 KB)
📄 prompt.c(12.92 KB)
📄 prompt.h(3.87 KB)
📄 proto.c(3.22 KB)
📄 proto.h(2.4 KB)
📄 radius.c(39.38 KB)
📄 radius.h(4.6 KB)
📄 route.c(25.91 KB)
📄 route.h(3.3 KB)
📄 server.c(10.9 KB)
📄 server.h(2.26 KB)
📄 sig.c(3.45 KB)
📄 sig.h(1.6 KB)
📄 slcompress.c(17.2 KB)
📄 slcompress.h(6.48 KB)
📄 sync.c(2.7 KB)
📄 sync.h(1.44 KB)
📄 systems.c(11.45 KB)
📄 systems.h(2.02 KB)
📄 tcp.c(5.63 KB)
📄 tcp.h(1.66 KB)
📄 tcpmss.c(5.06 KB)
📄 tcpmss.h(1.44 KB)
📄 throughput.c(8.84 KB)
📄 throughput.h(2.91 KB)
📄 timer.c(8.14 KB)
📄 timer.h(2.31 KB)
📄 tty.c(20.63 KB)
📄 tty.h(1.73 KB)
📄 tun.c(3.27 KB)
📄 tun.h(1.58 KB)
📄 ua.h(2.98 KB)
📄 udp.c(8.7 KB)
📄 udp.h(1.67 KB)
📄 vjcomp.c(5.68 KB)
📄 vjcomp.h(1.53 KB)

Editing: pred.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
 *                    Ian Donaldson <iand@labtam.labtam.oz.au>
 *                    Carsten Bormann <cabo@cs.tu-berlin.de>
 *                    Dave Rand <dlr@bungi.com>/<dave_rand@novell.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>
#include <termios.h>

#include "defs.h"
#include "layer.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "ccp.h"
#include "throughput.h"
#include "link.h"
#include "pred.h"

/* The following hash code is the heart of the algorithm:
 * It builds a sliding hash sum of the previous 3-and-a-bit characters
 * which will be used to index the guess table.
 * A better hash function would result in additional compression,
 * at the expense of time.
 */
#define HASH(state, x) state->hash = (state->hash << 4) ^ (x)
#define GUESS_TABLE_SIZE 65536

struct pred1_state {
  u_short hash;
  u_char dict[GUESS_TABLE_SIZE];
};

static int
compress(struct pred1_state *state, u_char *source, u_char *dest, int len)
{
  int i, bitmask;
  unsigned char *flagdest, flags, *orgdest;

orgdest = dest;
  while (len) {
    flagdest = dest++;
    flags = 0;			/* All guess wrong initially */
    for (bitmask = 1, i = 0; i < 8 && len; i++, bitmask <<= 1) {
      if (state->dict[state->hash] == *source) {
	flags |= bitmask;	/* Guess was right - don't output */
      } else {
	state->dict[state->hash] = *source;
	*dest++ = *source;	/* Guess wrong, output char */
      }
      HASH(state, *source++);
      len--;
    }
    *flagdest = flags;
  }
  return (dest - orgdest);
}

static void
SyncTable(struct pred1_state *state, u_char *source, u_char *dest, int len)
{
  while (len--) {
    *dest++ = state->dict[state->hash] = *source;
    HASH(state, *source++);
  }
}

static int
decompress(struct pred1_state *state, u_char *source, u_char *dest, int len)
{
  int i, bitmask;
  unsigned char flags, *orgdest;

orgdest = dest;
  while (len) {
    flags = *source++;
    len--;
    for (i = 0, bitmask = 1; i < 8; i++, bitmask <<= 1) {
      if (flags & bitmask) {
	*dest = state->dict[state->hash];	/* Guess correct */
      } else {
	if (!len)
	  break;		/* we seem to be really done -- cabo */
	state->dict[state->hash] = *source;	/* Guess wrong */
	*dest = *source++;	/* Read from source */
	len--;
      }
      HASH(state, *dest++);
    }
  }
  return (dest - orgdest);
}

static void
Pred1Term(void *v)
{
  struct pred1_state *state = (struct pred1_state *)v;
  free(state);
}

static void
Pred1ResetInput(void *v)
{
  struct pred1_state *state = (struct pred1_state *)v;
  state->hash = 0;
  memset(state->dict, '\0', sizeof state->dict);
  log_Printf(LogCCP, "Predictor1: Input channel reset\n");
}

static int
Pred1ResetOutput(void *v)
{
  struct pred1_state *state = (struct pred1_state *)v;
  state->hash = 0;
  memset(state->dict, '\0', sizeof state->dict);
  log_Printf(LogCCP, "Predictor1: Output channel reset\n");

return 1;		/* Ask FSM to ACK */
}

static void *
Pred1InitInput(struct bundle *bundle __unused, struct fsm_opt *o __unused)
{
  struct pred1_state *state;
  state = (struct pred1_state *)malloc(sizeof(struct pred1_state));
  if (state != NULL)
    Pred1ResetInput(state);
  return state;
}

static void *
Pred1InitOutput(struct bundle *bundle __unused, struct fsm_opt *o __unused)
{
  struct pred1_state *state;
  state = (struct pred1_state *)malloc(sizeof(struct pred1_state));
  if (state != NULL)
    Pred1ResetOutput(state);
  return state;
}

static struct mbuf *
Pred1Output(void *v, struct ccp *ccp, struct link *l __unused,
	    int pri __unused, u_short *proto, struct mbuf *bp)
{
  struct pred1_state *state = (struct pred1_state *)v;
  struct mbuf *mwp;
  u_char *cp, *wp, *hp;
  int orglen, len;
  u_char bufp[MAX_MTU + 2];
  u_short fcs;

orglen = m_length(bp) + 2;	/* add count of proto */
  mwp = m_get((orglen + 2) / 8 * 9 + 12, MB_CCPOUT);
  hp = wp = MBUF_CTOP(mwp);
  cp = bufp;
  *wp++ = *cp++ = orglen >> 8;
  *wp++ = *cp++ = orglen & 0377;
  *cp++ = *proto >> 8;
  *cp++ = *proto & 0377;
  mbuf_Read(bp, cp, orglen - 2);
  fcs = hdlc_Fcs(bufp, 2 + orglen);
  fcs = ~fcs;

len = compress(state, bufp + 2, wp, orglen);
  log_Printf(LogDEBUG, "Pred1Output: orglen (%d) --> len (%d)\n", orglen, len);
  ccp->uncompout += orglen;
  if (len < orglen) {
    *hp |= 0x80;
    wp += len;
    ccp->compout += len;
  } else {
    memcpy(wp, bufp + 2, orglen);
    wp += orglen;
    ccp->compout += orglen;
  }

*wp++ = fcs & 0377;
  *wp++ = fcs >> 8;
  mwp->m_len = wp - MBUF_CTOP(mwp);
  *proto = ccp_Proto(ccp);
  return mwp;
}

static struct mbuf *
Pred1Input(void *v, struct ccp *ccp, u_short *proto, struct mbuf *bp)
{
  struct pred1_state *state = (struct pred1_state *)v;
  u_char *cp, *pp;
  int len, olen, len1;
  struct mbuf *wp;
  u_char *bufp;
  u_short fcs;

wp = m_get(MAX_MRU + 2, MB_CCPIN);
  cp = MBUF_CTOP(bp);
  olen = m_length(bp);
  pp = bufp = MBUF_CTOP(wp);
  *pp++ = *cp & 0177;
  len = *cp++ << 8;
  *pp++ = *cp;
  len += *cp++;
  ccp->uncompin += len & 0x7fff;
  if (len & 0x8000) {
    len1 = decompress(state, cp, pp, olen - 4);
    ccp->compin += olen;
    len &= 0x7fff;
    if (len != len1) {		/* Error is detected. Send reset request */
      log_Printf(LogCCP, "Pred1: Length error (got %d, not %d)\n", len1, len);
      fsm_Reopen(&ccp->fsm);
      m_freem(bp);
      m_freem(wp);
      return NULL;
    }
    cp += olen - 4;
    pp += len1;
  } else if (len + 4 != olen) {
    log_Printf(LogCCP, "Pred1: Length error (got %d, not %d)\n", len + 4, olen);
    fsm_Reopen(&ccp->fsm);
    m_freem(wp);
    m_freem(bp);
    return NULL;
  } else {
    ccp->compin += len;
    SyncTable(state, cp, pp, len);
    cp += len;
    pp += len;
  }
  *pp++ = *cp++;		/* CRC */
  *pp++ = *cp++;
  fcs = hdlc_Fcs(bufp, wp->m_len = pp - bufp);
  if (fcs == GOODFCS) {
    wp->m_offset += 2;		/* skip length */
    wp->m_len -= 4;		/* skip length & CRC */
    pp = MBUF_CTOP(wp);
    *proto = *pp++;
    if (*proto & 1) {
      wp->m_offset++;
      wp->m_len--;
    } else {
      wp->m_offset += 2;
      wp->m_len -= 2;
      *proto = (*proto << 8) | *pp++;
    }
    m_freem(bp);
    return wp;
  } else {
    const char *pre = *MBUF_CTOP(bp) & 0x80 ? "" : "un";
    log_Printf(LogDEBUG, "Pred1Input: fcs = 0x%04x (%scompressed), len = 0x%x,"
	      " olen = 0x%x\n", fcs, pre, len, olen);
    log_Printf(LogCCP, "%s: Bad %scompressed CRC-16\n",
               ccp->fsm.link->name, pre);
    fsm_Reopen(&ccp->fsm);
    m_freem(wp);
  }
  m_freem(bp);
  return NULL;
}

static void
Pred1DictSetup(void *v __unused, struct ccp *ccp __unused,
	       u_short proto __unused, struct mbuf *bp __unused)
{
  /* Nothing to see here */
}

static const char *
Pred1DispOpts(struct fsm_opt *o __unused)
{
  return NULL;
}

static void
Pred1InitOptsOutput(struct bundle *bundle __unused, struct fsm_opt *o,
                    const struct ccp_config *cfg __unused)
{
  o->hdr.len = 2;
}

static int
Pred1SetOpts(struct bundle *bundle __unused, struct fsm_opt *o,
             const struct ccp_config *cfg __unused)
{
  if (o->hdr.len != 2) {
    o->hdr.len = 2;
    return MODE_NAK;
  }
  return MODE_ACK;
}

const struct ccp_algorithm Pred1Algorithm = {
  TY_PRED1,
  CCP_NEG_PRED1,
  Pred1DispOpts,
  ccp_DefaultUsable,
  ccp_DefaultRequired,
  {
    Pred1SetOpts,
    Pred1InitInput,
    Pred1Term,
    Pred1ResetInput,
    Pred1Input,
    Pred1DictSetup
  },
  {
    0,
    Pred1InitOptsOutput,
    Pred1SetOpts,
    Pred1InitOutput,
    Pred1Term,
    Pred1ResetOutput,
    Pred1Output
  },
};

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Editing: pred.c

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