mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-17 10:26:15 +00:00
92b0955883
(see the new ``set callback'' and ``set cbcp'' commands) o Add a ``cbcp'' log level and mbuf type. o Don't dump core when \T is given in ``set login'' or ``set hangup''. o Allow ``*'' and blanks as placeholders in ppp.secret and allow a fifth field for specifying auth/cbcp dialback parameters. o Remove a few extraneous #includes o Define the default number of REQs (restart counter) in defs.h rather than hardcoding ``5'' all over the place. o Fix a few man page inconsistencies.
334 lines
8.3 KiB
C
334 lines
8.3 KiB
C
/*-
|
|
* 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.
|
|
*
|
|
* $Id: pred.c,v 1.21 1998/05/21 21:47:53 brian Exp $
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "defs.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 "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--) {
|
|
if (state->dict[state->hash] != *source)
|
|
state->dict[state->hash] = *source;
|
|
HASH(state, *dest++ = *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 void
|
|
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");
|
|
}
|
|
|
|
static void *
|
|
Pred1InitInput(struct lcp_opt *o)
|
|
{
|
|
struct pred1_state *state;
|
|
state = (struct pred1_state *)malloc(sizeof(struct pred1_state));
|
|
if (state != NULL)
|
|
Pred1ResetInput(state);
|
|
return state;
|
|
}
|
|
|
|
static void *
|
|
Pred1InitOutput(struct lcp_opt *o)
|
|
{
|
|
struct pred1_state *state;
|
|
state = (struct pred1_state *)malloc(sizeof(struct pred1_state));
|
|
if (state != NULL)
|
|
Pred1ResetOutput(state);
|
|
return state;
|
|
}
|
|
|
|
static int
|
|
Pred1Output(void *v, struct ccp *ccp, struct link *l, int pri, 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 = mbuf_Length(bp) + 2; /* add count of proto */
|
|
mwp = mbuf_Alloc((orglen + 2) / 8 * 9 + 12, MB_HDLCOUT);
|
|
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(INITFCS, 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->cnt = wp - MBUF_CTOP(mwp);
|
|
hdlc_Output(l, PRI_NORMAL, ccp_Proto(ccp), mwp);
|
|
return 1;
|
|
}
|
|
|
|
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 = mbuf_Alloc(MAX_MTU + 2, MB_IPIN);
|
|
cp = MBUF_CTOP(bp);
|
|
olen = mbuf_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\n");
|
|
ccp_SendResetReq(&ccp->fsm);
|
|
mbuf_Free(bp);
|
|
mbuf_Free(wp);
|
|
return NULL;
|
|
}
|
|
cp += olen - 4;
|
|
pp += len1;
|
|
} else {
|
|
ccp->compin += len;
|
|
SyncTable(state, cp, pp, len);
|
|
cp += len;
|
|
pp += len;
|
|
}
|
|
*pp++ = *cp++; /* CRC */
|
|
*pp++ = *cp++;
|
|
fcs = hdlc_Fcs(INITFCS, bufp, wp->cnt = pp - bufp);
|
|
if (fcs != GOODFCS)
|
|
log_Printf(LogDEBUG, "Pred1Input: fcs = 0x%04x (%s), len = 0x%x,"
|
|
" olen = 0x%x\n", fcs, (fcs == GOODFCS) ? "good" : "bad",
|
|
len, olen);
|
|
if (fcs == GOODFCS) {
|
|
wp->offset += 2; /* skip length */
|
|
wp->cnt -= 4; /* skip length & CRC */
|
|
pp = MBUF_CTOP(wp);
|
|
*proto = *pp++;
|
|
if (*proto & 1) {
|
|
wp->offset++;
|
|
wp->cnt--;
|
|
} else {
|
|
wp->offset += 2;
|
|
wp->cnt -= 2;
|
|
*proto = (*proto << 8) | *pp++;
|
|
}
|
|
mbuf_Free(bp);
|
|
return wp;
|
|
} else {
|
|
log_DumpBp(LogHDLC, "Bad FCS", wp);
|
|
ccp_SendResetReq(&ccp->fsm);
|
|
mbuf_Free(wp);
|
|
}
|
|
mbuf_Free(bp);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
Pred1DictSetup(void *v, struct ccp *ccp, u_short proto, struct mbuf * bp)
|
|
{
|
|
}
|
|
|
|
static const char *
|
|
Pred1DispOpts(struct lcp_opt *o)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
Pred1InitOptsOutput(struct lcp_opt *o, const struct ccp_config *cfg)
|
|
{
|
|
o->len = 2;
|
|
}
|
|
|
|
static int
|
|
Pred1SetOptsOutput(struct lcp_opt *o)
|
|
{
|
|
if (o->len != 2) {
|
|
o->len = 2;
|
|
return MODE_NAK;
|
|
}
|
|
return MODE_ACK;
|
|
}
|
|
|
|
static int
|
|
Pred1SetOptsInput(struct lcp_opt *o, const struct ccp_config *cfg)
|
|
{
|
|
return Pred1SetOptsOutput(o);
|
|
}
|
|
|
|
const struct ccp_algorithm Pred1Algorithm = {
|
|
TY_PRED1,
|
|
CCP_NEG_PRED1,
|
|
Pred1DispOpts,
|
|
{
|
|
Pred1SetOptsInput,
|
|
Pred1InitInput,
|
|
Pred1Term,
|
|
Pred1ResetInput,
|
|
Pred1Input,
|
|
Pred1DictSetup
|
|
},
|
|
{
|
|
Pred1InitOptsOutput,
|
|
Pred1SetOptsOutput,
|
|
Pred1InitOutput,
|
|
Pred1Term,
|
|
Pred1ResetOutput,
|
|
Pred1Output
|
|
},
|
|
};
|