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NetBSD/gnu/libexec/uucp/prote.c

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initial import of 386bsd-0.1 sources
1993-03-21 12:45:37 +03:00
/* prote.c
The 'e' 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: prote.c,v $
Revision 1.1.1.1 1993/03/21 09:45:37 cgd
initial import of 386bsd-0.1 sources
Revision 1.7 1992/03/30 04:49:10 ian
Niels Baggesen: added debugging types abnormal and uucp-proto
Revision 1.6 1992/03/17 01:03:03 ian
Miscellaneous cleanup
Revision 1.5 1992/03/13 22:59:25 ian
Have breceive_char go through freceive_data
Revision 1.4 1992/03/12 19:56:10 ian
Debugging based on types rather than number
Revision 1.3 1992/02/08 03:54:18 ian
Include <string.h> only in <uucp.h>, added 1992 copyright
Revision 1.2 1992/01/16 18:16:58 ian
Niels Baggesen: add some debugging messages
Revision 1.1 1991/12/31 19:43:30 ian
Initial revision
*/
#include "uucp.h"
#if USE_RCS_ID
char prote_rcsid[] = "$Id: prote.c,v 1.1.1.1 1993/03/21 09:45:37 cgd Exp $";
#endif
#include "prot.h"
#include "port.h"
#include "system.h"
/* This implementation is based on my implementation of the 't'
protocol, which is fairly similar. The main difference between the
protocols seems to be that 't' breaks the file into packets and
transmits the size of the packet with each packet, whereas 'e'
sends the size of the entire file and then sends all the data in a
single enormous packet.
The 'e' protocol does no error checking whatsoever and thus
requires an end-to-end verified eight bit communication line, such
as is provided by TCP. Using it with a modem is inadvisable, since
errors can occur between the modem and the computer. */
/* The buffer size we use. */
#define CEBUFSIZE (CRECBUFLEN / 2)
/* The size of the initial file size message. */
#define CEFRAMELEN (20)
/* A pointer to the buffer we will use. */
static char *zEbuf;
/* True if we are receiving a file. */
static boolean fEfile;
/* The number of bytes we have left to send or receive. */
static long cEbytes;
/* The timeout we use. */
static int cEtimeout = 120;
struct scmdtab asEproto_params[] =
{
{ "timeout", CMDTABTYPE_INT, (pointer) &cEtimeout, NULL },
{ NULL, 0, NULL, NULL }
};
/* Local function. */
static boolean feprocess_data P((boolean *pfexit, int *pcneed));
/* Start the protocol. */
/*ARGSUSED*/
boolean
festart (fmaster)
boolean fmaster;
{
if (! fport_set (PORTSETTING_EIGHT))
return FALSE;
zEbuf = (char *) xmalloc (CEBUFSIZE);
fEfile = FALSE;
usysdep_sleep (2);
return TRUE;
}
/* Stop the protocol. */
boolean
feshutdown ()
{
xfree ((pointer) zEbuf);
zEbuf = NULL;
return TRUE;
}
/* Send a command string. We send everything up to and including the
null byte. */
boolean
fesendcmd (z)
const char *z;
{
DEBUG_MESSAGE1 (DEBUG_UUCP_PROTO, "fesendcmd: Sending command \"%s\"", z);
return fsend_data (z, strlen (z) + 1, TRUE);
}
/* Get space to be filled with data. We provide a buffer which has
20 bytes at the start available to hold the length. */
char *
zegetspace (pclen)
int *pclen;
{
*pclen = CEBUFSIZE;
return zEbuf;
}
/* Send out some data. We are allowed to modify the 20 bytes
preceding the buffer. This allows us to send the entire block with
header bytes in a single call. */
boolean
fesenddata (zdata, cdata)
char *zdata;
int cdata;
{
#if DEBUG > 0
/* Keep track of the number of bytes we send out to make sure it all
adds up. */
cEbytes -= cdata;
if (cEbytes < 0)
{
ulog (LOG_ERROR, "Protocol 'e' internal error");
return FALSE;
}
#endif
/* We pass FALSE to fsend_data since we don't expect the other side
to be sending us anything just now. */
return fsend_data (zdata, cdata, FALSE);
}
/* Process any data in the receive buffer. */
boolean
feprocess (pfexit)
boolean *pfexit;
{
return feprocess_data (pfexit, (int *) NULL);
}
/* Process data and return the amount we need in *pfneed. */
static boolean
feprocess_data (pfexit, pcneed)
boolean *pfexit;
int *pcneed;
{
int cinbuf, cfirst, clen;
*pfexit = FALSE;
cinbuf = iPrecend - iPrecstart;
if (cinbuf < 0)
cinbuf += CRECBUFLEN;
if (! fEfile)
{
/* We are not receiving a file. Commands continue up to a null
byte. */
while (cinbuf > 0)
{
char *pnull;
cfirst = CRECBUFLEN - iPrecstart;
if (cfirst > cinbuf)
cfirst = cinbuf;
pnull = memchr (abPrecbuf + iPrecstart, '\0', cfirst);
if (pnull != NULL)
cfirst = pnull - (abPrecbuf + iPrecstart) + 1;
DEBUG_MESSAGE1 (DEBUG_PROTO,
"feprocess_data: Got %d command bytes",
cfirst);
if (! fgot_data (abPrecbuf + iPrecstart, cfirst, TRUE, FALSE,
pfexit))
return FALSE;
iPrecstart = (iPrecstart + cfirst) % CRECBUFLEN;
if (*pfexit)
return TRUE;
cinbuf = iPrecend - iPrecstart;
if (cinbuf < 0)
cinbuf += CRECBUFLEN;
}
if (pcneed != NULL)
*pcneed = 1;
return TRUE;
}
/* Here we are receiving a file. We want cEbytes in total. If we
don't have cEbytes yet, we have to get it first. */
if (cEbytes == -1)
{
char ab[CEFRAMELEN + 1];
if (cinbuf < CEFRAMELEN)
{
if (pcneed != NULL)
*pcneed = CEFRAMELEN - cinbuf;
return TRUE;
}
cfirst = CRECBUFLEN - iPrecstart;
if (cfirst >= CEFRAMELEN)
memcpy (ab, abPrecbuf + iPrecstart, CEFRAMELEN);
else
{
memcpy (ab, abPrecbuf + iPrecstart, cfirst);
memcpy (ab + cfirst, abPrecbuf, CEFRAMELEN - cfirst);
}
ab[CEFRAMELEN] = '\0';
cEbytes = strtol (ab, (char **) NULL, 10);
iPrecstart = (iPrecstart + CEFRAMELEN) % CRECBUFLEN;
cinbuf = iPrecend - iPrecstart;
if (cinbuf < 0)
cinbuf += CRECBUFLEN;
}
/* Here we can read real data for the file. */
while (cinbuf > 0)
{
clen = cinbuf;
if ((long) clen > cEbytes)
clen = (int) cEbytes;
cfirst = CRECBUFLEN - iPrecstart;
if (cfirst > clen)
cfirst = clen;
DEBUG_MESSAGE1 (DEBUG_PROTO,
"feprocess_data: Got %d data bytes",
cfirst);
if (! fgot_data (abPrecbuf + iPrecstart, cfirst, FALSE, TRUE,
pfexit))
return FALSE;
if (cfirst < clen)
{
if (! fgot_data (abPrecbuf, clen - cfirst, FALSE, TRUE,
pfexit))
return FALSE;
}
iPrecstart = (iPrecstart + clen) % CRECBUFLEN;
cEbytes -= clen;
if (cEbytes == 0)
{
if (! fgot_data (abPrecbuf, 0, FALSE, TRUE, pfexit))
return FALSE;
if (*pfexit)
return TRUE;
}
cinbuf -= clen;
}
if (pcneed != NULL)
{
if (cEbytes > CRECBUFLEN / 2)
*pcneed = CRECBUFLEN / 2;
else
*pcneed = (int) cEbytes;
}
return TRUE;
}
/* Wait for data to come in and process it until we've reached the end
of a command or a file. */
boolean
fewait ()
{
while (TRUE)
{
boolean fexit;
int cneed, crec;
if (! feprocess_data (&fexit, &cneed))
return FALSE;
if (fexit)
return TRUE;
if (! freceive_data (cneed, &crec, cEtimeout, TRUE))
return FALSE;
if (crec == 0)
{
ulog (LOG_ERROR, "Timed out waiting for data");
return FALSE;
}
}
}
/* File level routine, to handle transferring the amount of data and
to set fEfile correctly. */
boolean
fefile (fstart, fsend, pfredo, cbytes)
boolean fstart;
boolean fsend;
boolean *pfredo;
long cbytes;
{
if (pfredo != NULL)
*pfredo = FALSE;
if (fstart)
{
if (fsend)
{
char ab[CEFRAMELEN];
DEBUG_MESSAGE1 (DEBUG_PROTO,
"Protocol 'e' starting to send %ld bytes",
cbytes);
bzero (ab, CEFRAMELEN);
sprintf (ab, "%ld", cbytes);
if (! fsend_data (ab, CEFRAMELEN, TRUE))
return FALSE;
cEbytes = cbytes;
}
else
{
cEbytes = -1;
fEfile = TRUE;
}
}
else
{
if (! fsend)
fEfile = FALSE;
#if DEBUG > 0
if (cEbytes != 0)
{
ulog (LOG_ERROR,
"Protocol 'e' internal error: %ld bytes left over",
cEbytes);
return FALSE;
}
#endif
}
return TRUE;
}
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