Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/gnu/libexec/uucp/protf.c

674 lines
15 KiB
C
Raw Normal View History

initial import of 386bsd-0.1 sources
1993-03-21 12:45:37 +03:00
/* protf.c
The 'f' protocol.
Copyright (C) 1991, 1992 Ian Lance Taylor
This file is part of the Taylor UUCP package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
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; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
The author of the program may be contacted at ian@airs.com or
c/o AIRS, P.O. Box 520, Waltham, MA 02254.
$Log: protf.c,v $
Revision 1.1.1.1 1993/03/21 09:45:37 cgd
initial import of 386bsd-0.1 sources
Revision 1.15 1992/03/30 04:49:10 ian
Niels Baggesen: added debugging types abnormal and uucp-proto
Revision 1.14 1992/03/17 01:03:03 ian
Miscellaneous cleanup
Revision 1.13 1992/03/13 22:59:25 ian
Have breceive_char go through freceive_data
Revision 1.12 1992/03/12 19:56:10 ian
Debugging based on types rather than number
Revision 1.11 1992/02/08 03:54:18 ian
Include <string.h> only in <uucp.h>, added 1992 copyright
Revision 1.10 1992/01/16 18:16:58 ian
Niels Baggesen: add some debugging messages
Revision 1.9 1992/01/14 04:35:23 ian
Chip Salzenberg: implement this patch correctly
Revision 1.8 1992/01/14 04:21:59 ian
Chip Salzenberg: avoid use before set warning
Revision 1.7 1991/12/31 19:34:19 ian
Added number of bytes to pffile protocol entry point
Revision 1.6 1991/12/20 03:02:01 ian
Oleg Tabarovsky: added statistical messages to 'g' and 'f' protocols
Revision 1.5 1991/12/20 00:01:54 ian
Franc,ois Pinard: don't crash 'f' protocol because of an illegal byte
Revision 1.4 1991/11/16 00:31:01 ian
Increased default 't' and 'f' protocol timeouts
Revision 1.3 1991/11/15 23:32:15 ian
Don't use 1 second timeouts--loses data on System V
Revision 1.2 1991/11/15 21:00:59 ian
Efficiency hacks for 'f' and 't' protocols
Revision 1.1 1991/11/11 04:21:16 ian
Initial revision
*/
#include "uucp.h"
#if USE_RCS_ID
char protf_rcsid[] = "$Id: protf.c,v 1.1.1.1 1993/03/21 09:45:37 cgd Exp $";
#endif
#include <ctype.h>
#include <errno.h>
#include "prot.h"
#include "port.h"
#include "system.h"
/* This implementation is based on code by Piet Beertema, CWI,
Amsterdam, Sep 1984.
This code implements the 'f' protocol, which requires a
flow-controlled error-free seven-bit data path. It does check for
errors, but only at the end of each file transmission, so a noisy
line without error correcting modems will be unusable.
The conversion to seven bit data is done as follows, where b
represents the character to convert:
0 <= b <= 037: 0172, b + 0100 (0100 to 0137)
040 <= b <= 0171: b ( 040 to 0171)
0172 <= b <= 0177: 0173, b - 0100 ( 072 to 077)
0200 <= b <= 0237: 0174, b - 0100 (0100 to 0137)
0240 <= b <= 0371: 0175, b - 0200 ( 040 to 0171)
0372 <= b <= 0377: 0176, b - 0300 ( 072 to 077)
This causes all output bytes to be in the range 040 to 0176; these
are the printable ASCII characters. */
/* Internal functions. */
static boolean ffprocess_data P((boolean *pfexit, int *pcneed));
/* The size of the buffer we allocate to store outgoing data in. */
#define CFBUFSIZE (256)
/* The timeout to wait for data to arrive before giving up. */
static int cFtimeout = 120;
/* The maximum number of retries. */
static int cFmaxretries = 2;
/* The buffer we allocate for outgoing data. */
static char *zFbuf;
/* TRUE if we are receiving a file rather than a command. */
static boolean fFfile;
/* The checksum so far. */
static unsigned int iFcheck;
/* The last special byte (0172 to 0176) or 0 if none. */
static char bFspecial;
/* The number of times we have retried this file. */
static int cFretries;
struct scmdtab asFproto_params[] =
{
{ "timeout", CMDTABTYPE_INT, (pointer) &cFtimeout, NULL },
{ "retries", CMDTABTYPE_INT, (pointer) &cFmaxretries, NULL },
{ NULL, 0, NULL, NULL }
};
/* Statistics. */
/* The number of data bytes sent in files. */
static long cFsent_data;
/* The number of actual bytes sent in files. */
static long cFsent_bytes;
/* The number of data bytes received in files. */
static long cFrec_data;
/* The number of actual bytes received in files. */
static long cFrec_bytes;
/* The number of file retries when sending. */
static long cFsend_retries;
/* The number of file retries when receiving. */
static long cFrec_retries;
/* Start the protocol. */
/*ARGSUSED*/
boolean
ffstart (fmaster)
boolean fmaster;
{
cFsent_data = 0;
cFsent_bytes = 0;
cFrec_data = 0;
cFrec_bytes = 0;
cFsend_retries = 0;
cFrec_retries = 0;
/* Allow XON/XOFF to work. */
if (! fport_set (PORTSETTING_SEVEN))
return FALSE;
/* We sleep to allow the other side to reset the terminal; this is
what Mr. Beertema's code does. */
usysdep_sleep (2);
return TRUE;
}
/* Shutdown the protocol. */
boolean
ffshutdown ()
{
xfree ((pointer) zFbuf);
zFbuf = NULL;
ulog (LOG_NORMAL,
"Protocol 'f': sent %ld bytes for %ld, received %ld bytes for %ld",
cFsent_bytes, cFsent_data, cFrec_bytes, cFrec_data);
if (cFsend_retries != 0 || cFrec_retries != 0)
ulog (LOG_NORMAL, "Protocol 'f' file retries: %ld sending, %ld receiving",
cFsend_retries, cFrec_retries);
return TRUE;
}
/* Send a command string. We just send the string followed by a carriage
return. */
boolean
ffsendcmd (z)
const char *z;
{
int clen;
char *zalc;
DEBUG_MESSAGE1 (DEBUG_UUCP_PROTO, "ffsendcmd: Sending command \"%s\"", z);
clen = strlen (z);
zalc = (char *) alloca (clen + 2);
sprintf (zalc, "%s\r", z);
return fsend_data (zalc, clen + 1, TRUE);
}
/* Get space to be filled with data. We allocate the space from the
heap. */
char *
zfgetspace (pclen)
int *pclen;
{
*pclen = CFBUFSIZE;
if (zFbuf == NULL)
zFbuf = (char *) xmalloc (CFBUFSIZE);
return zFbuf;
}
/* Send out a data packet. We have to encode the data into seven bits
and accumulate a checksum. */
boolean
ffsenddata (zdata, cdata)
char *zdata;
int cdata;
{
char ab[CFBUFSIZE * 2];
char *ze;
register unsigned int itmpchk;
cFsent_data += cdata;
ze = ab;
itmpchk = iFcheck;
while (cdata-- > 0)
{
register int b;
/* Rotate the checksum left. */
if ((itmpchk & 0x8000) == 0)
itmpchk <<= 1;
else
{
itmpchk <<= 1;
++itmpchk;
}
/* Add the next byte into the checksum. */
b = *zdata++ & 0xff;
itmpchk += b;
/* Encode the byte. */
if (b <= 0177)
{
if (b <= 037)
{
*ze++ = '\172';
*ze++ = (char) (b + 0100);
}
else if (b <= 0171)
*ze++ = (char) b;
else
{
*ze++ = '\173';
*ze++ = (char) (b - 0100);
}
}
else
{
if (b <= 0237)
{
*ze++ = '\174';
*ze++ = (char) (b - 0100);
}
else if (b <= 0371)
{
*ze++ = '\175';
*ze++ = (char) (b - 0200);
}
else
{
*ze++ = '\176';
*ze++ = (char) (b - 0300);
}
}
}
iFcheck = itmpchk;
cFsent_bytes += ze - ab;
/* Passing FALSE tells fsend_data not to bother looking for incoming
information, since we really don't expect any. */
return fsend_data (ab, ze - ab, FALSE);
}
/* Process any data in the receive buffer. */
boolean
ffprocess (pfexit)
boolean *pfexit;
{
return ffprocess_data (pfexit, (int *) NULL);
}
/* Process data and return the amount of data we are looking for in
*pcneed. The 'f' protocol doesn't really reveal this, but when
transferring file we know that we need at least seven characters
for the checksum. */
static boolean
ffprocess_data (pfexit, pcneed)
boolean *pfexit;
int *pcneed;
{
int i;
register unsigned int itmpchk;
if (pcneed != NULL)
*pcneed = 1;
if (! fFfile)
{
/* A command continues until a '\r' character, which we turn
into '\0' before calling fgot_data. */
while (iPrecstart != iPrecend)
{
for (i = iPrecstart; i < CRECBUFLEN && i != iPrecend; i++)
{
if (abPrecbuf[i] == '\r')
{
int istart;
abPrecbuf[i] = '\0';
istart = iPrecstart;
iPrecstart = (i + 1) % CRECBUFLEN;
return fgot_data (abPrecbuf + istart, i - istart + 1,
TRUE, FALSE, pfexit);
}
}
if (! fgot_data (abPrecbuf + iPrecstart, i - iPrecstart,
TRUE, FALSE, pfexit))
return FALSE;
iPrecstart = i % CRECBUFLEN;
}
*pfexit = FALSE;
return TRUE;
}
/* Here the data is destined for a file, and we must decode it. */
itmpchk = iFcheck;
while (iPrecstart != iPrecend)
{
char *zstart, *zto, *zfrom;
int c;
zto = zfrom = zstart = abPrecbuf + iPrecstart;
c = iPrecend - iPrecstart;
if (c < 0)
c = CRECBUFLEN - iPrecstart;
while (c-- != 0)
{
int b;
b = *zfrom++ & 0xff;
if (b < 040 || b > 0176)
{
ulog (LOG_ERROR, "Illegal byte %d", b);
continue;
}
/* Characters >= 0172 are always special characters. The
only legal pair of consecutive special characters
are 0176 0176 which immediately precede the four
digit checksum. */
if (b >= 0172)
{
if (bFspecial != 0)
{
if (bFspecial != 0176 || b != 0176)
{
ulog (LOG_ERROR, "Illegal bytes %d %d",
bFspecial, b);
bFspecial = 0;
continue;
}
/* Pass any initial data. */
if (zto != zstart)
{
/* Don't count the checksum in the received bytes. */
cFrec_bytes += zfrom - zstart - 2;
cFrec_data += zto - zstart;
if (! fgot_data (zstart, zto - zstart, FALSE,
TRUE, pfexit))
return FALSE;
}
/* The next characters we want to read are the
checksum, so skip the second 0176. */
iPrecstart = (iPrecstart + zfrom - zstart) % CRECBUFLEN;
iFcheck = itmpchk;
/* Tell fgot_data that we've read the entire file by
passing 0 length data. This will set *pfexit to
TRUE and call fffile to verify the checksum. */
return fgot_data ((char *) NULL, 0, FALSE, TRUE, pfexit);
}
/* Here we have encountered a special character that
does not follow another special character. */
bFspecial = (char) b;
}
else
{
int bnext;
/* Here we have encountered a nonspecial character. */
switch (bFspecial)
{
default:
bnext = b;
break;
case 0172:
bnext = b - 0100;
break;
case 0173:
case 0174:
bnext = b + 0100;
break;
case 0175:
bnext = b + 0200;
break;
case 0176:
bnext = b + 0300;
break;
}
*zto++ = (char) bnext;
bFspecial = 0;
/* Rotate the checksum left. */
if ((itmpchk & 0x8000) == 0)
itmpchk <<= 1;
else
{
itmpchk <<= 1;
++itmpchk;
}
/* Add the next byte into the checksum. */
itmpchk += bnext;
}
}
if (zto != zstart)
{
DEBUG_MESSAGE1 (DEBUG_PROTO,
"ffprocess: Calling fgot_data with %d bytes",
zto - zstart);
cFrec_data += zto - zstart;
if (! fgot_data (zstart, zto - zstart, FALSE, TRUE, pfexit))
return FALSE;
}
cFrec_bytes += zfrom - zstart;
iPrecstart = (iPrecstart + zfrom - zstart) % CRECBUFLEN;
}
iFcheck = itmpchk;
if (pcneed != NULL)
{
/* At this point we may have seen the first 0176 in the checksum
but not the second. The checksum is at least seven
characters long (0176 0176 a b c d \r). This won't help
much, but reading seven characters is a lot better than
reading two, which is what I saw in a 2400 baud log file. */
if (bFspecial == 0176)
*pcneed = 6;
else
*pcneed = 7;
}
*pfexit = FALSE;
return TRUE;
}
/* Wait for data to come in and process it until we've finished a
command or a file. */
boolean
ffwait ()
{
while (TRUE)
{
boolean fexit;
int cneed, crec;
if (! ffprocess_data (&fexit, &cneed))
return FALSE;
if (fexit)
return TRUE;
/* We only ask for one character at a time. This could wind up
being quite inefficient, since we might only get one
character back from each read. We really want to do
something like get all available characters, then sleep for
half a second and get all available characters again, and
keep this up until we don't get anything after sleeping. */
if (! freceive_data (cneed, &crec, cFtimeout, TRUE))
return FALSE;
if (crec == 0)
{
ulog (LOG_ERROR, "Timed out waiting for data");
return FALSE;
}
}
}
/* File level operations. Reset the checksums when starting to send
or receive a file, and output the checksum when we've finished
sending a file. */
/*ARGSUSED*/
boolean
fffile (fstart, fsend, pfredo, cbytes)
boolean fstart;
boolean fsend;
boolean *pfredo;
long cbytes;
{
if (fstart)
{
iFcheck = 0xffff;
cFretries = 0;
if (! fsend)
{
bFspecial = 0;
fFfile = TRUE;
}
return TRUE;
}
else
{
const char *z;
*pfredo = FALSE;
if (fsend)
{
char ab[8];
/* Send the final checksum. */
sprintf (ab, "\176\176%04x\r", iFcheck & 0xffff);
if (! fsend_data (ab, 7, TRUE))
return FALSE;
/* Now look for the acknowledgement. */
z = zgetcmd ();
if (z == NULL)
return FALSE;
/* An R means to retry sending the file. */
if (*z == 'R')
{
++cFretries;
if (cFretries > cFmaxretries)
{
ulog (LOG_ERROR, "Too many retries");
return FALSE;
}
*pfredo = TRUE;
iFcheck = 0xffff;
++cFsend_retries;
return TRUE;
}
if (*z == 'G')
return TRUE;
DEBUG_MESSAGE1 (DEBUG_PROTO, "fffile: Got \"%s\"", z);
ulog (LOG_ERROR, "File send failed");
return FALSE;
}
else
{
unsigned int icheck;
/* We next expect to receive a command. */
fFfile = FALSE;
/* Get the checksum. */
z = zgetcmd ();
if (z == NULL)
return FALSE;
if (strlen (z) != 4
|| ! isxdigit (z[0])
|| ! isxdigit (z[1])
|| ! isxdigit (z[2])
|| ! isxdigit (z[3]))
{
ulog (LOG_ERROR, "Bad checksum format");
return FALSE;
}
icheck = strtol (z, (char **) NULL, 16);
if (icheck != (iFcheck & 0xffff))
{
DEBUG_MESSAGE2 (DEBUG_PROTO | DEBUG_ABNORMAL,
"Checksum failed; calculated 0x%x, got 0x%x",
iFcheck & 0xffff, icheck);
++cFretries;
if (cFretries > cFmaxretries)
{
ulog (LOG_ERROR, "Too many retries");
(void) ffsendcmd ("Q");
return FALSE;
}
*pfredo = TRUE;
iFcheck = 0xffff;
bFspecial = 0;
fFfile = TRUE;
++cFrec_retries;
/* Send an R to tell the other side to resend the file. */
return ffsendcmd ("R");
}
/* Send a G to tell the other side the file was received
correctly. */
return ffsendcmd ("G");
}
}
}