388 lines
8.7 KiB
C
388 lines
8.7 KiB
C
/* prote.c
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The 'e' protocol.
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Copyright (C) 1991, 1992 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
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*/
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#include "uucp.h"
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#if USE_RCS_ID
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const char prote_rcsid[] = "$Id: prote.c,v 1.1 1993/08/04 19:36:18 jtc Exp $";
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#endif
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#include "uudefs.h"
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#include "uuconf.h"
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#include "conn.h"
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#include "trans.h"
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#include "system.h"
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#include "prot.h"
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/* This implementation is based on my implementation of the 't'
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protocol, which is fairly similar. The main difference between the
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protocols seems to be that 't' breaks the file into packets and
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transmits the size of the packet with each packet, whereas 'e'
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sends the size of the entire file and then sends all the data in a
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single enormous packet.
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The 'e' protocol does no error checking whatsoever and thus
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requires an end-to-end verified eight bit communication line, such
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as is provided by TCP. Using it with a modem is inadvisable, since
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errors can occur between the modem and the computer. */
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/* The buffer size we use. */
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#define CEBUFSIZE (CRECBUFLEN / 2)
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/* The size of the initial file size message. */
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#define CEFRAMELEN (20)
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/* A pointer to the buffer we will use. */
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static char *zEbuf;
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/* True if we are receiving a file. */
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static boolean fEfile;
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/* The number of bytes we have left to send or receive. */
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static long cEbytes;
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/* The timeout we use. */
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static int cEtimeout = 120;
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struct uuconf_cmdtab asEproto_params[] =
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{
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{ "timeout", UUCONF_CMDTABTYPE_INT, (pointer) &cEtimeout, NULL },
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{ NULL, 0, NULL, NULL }
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};
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/* Local function. */
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static boolean feprocess_data P((struct sdaemon *qdaemon, boolean *pfexit,
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size_t *pcneed));
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/* Start the protocol. */
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boolean
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festart (qdaemon, pzlog)
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struct sdaemon *qdaemon;
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char **pzlog;
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{
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*pzlog = NULL;
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if (! fconn_set (qdaemon->qconn, PARITYSETTING_NONE,
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STRIPSETTING_EIGHTBITS, XONXOFF_OFF))
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return FALSE;
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zEbuf = (char *) xmalloc (CEBUFSIZE);
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fEfile = FALSE;
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usysdep_sleep (2);
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return TRUE;
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}
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/* Stop the protocol. */
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/*ARGSUSED*/
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boolean
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feshutdown (qdaemon)
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struct sdaemon *qdaemon;
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{
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xfree ((pointer) zEbuf);
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zEbuf = NULL;
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cEtimeout = 120;
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return TRUE;
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}
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/* Send a command string. We send everything up to and including the
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null byte. */
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/*ARGSUSED*/
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boolean
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fesendcmd (qdaemon, z, ilocal, iremote)
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struct sdaemon *qdaemon;
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const char *z;
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int ilocal;
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int iremote;
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{
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DEBUG_MESSAGE1 (DEBUG_UUCP_PROTO, "fesendcmd: Sending command \"%s\"", z);
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return fsend_data (qdaemon->qconn, z, strlen (z) + 1, TRUE);
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}
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/* Get space to be filled with data. We provide a buffer which has
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20 bytes at the start available to hold the length. */
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/*ARGSUSED*/
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char *
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zegetspace (qdaemon, pclen)
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struct sdaemon *qdaemon;
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size_t *pclen;
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{
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*pclen = CEBUFSIZE;
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return zEbuf;
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}
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/* Send out some data. We are allowed to modify the 20 bytes
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preceding the buffer. This allows us to send the entire block with
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header bytes in a single call. */
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/*ARGSIGNORED*/
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boolean
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fesenddata (qdaemon, zdata, cdata, ilocal, iremote, ipos)
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struct sdaemon *qdaemon;
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char *zdata;
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size_t cdata;
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int ilocal;
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int iremote;
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long ipos;
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{
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#if DEBUG > 0
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/* Keep track of the number of bytes we send out to make sure it all
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adds up. */
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cEbytes -= cdata;
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if (cEbytes < 0)
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{
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ulog (LOG_ERROR, "Protocol 'e' internal error");
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return FALSE;
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}
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#endif
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/* We pass FALSE to fsend_data since we don't expect the other side
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to be sending us anything just now. */
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return fsend_data (qdaemon->qconn, zdata, cdata, FALSE);
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}
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/* Process data and return the amount we need in *pfneed. */
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static boolean
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feprocess_data (qdaemon, pfexit, pcneed)
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struct sdaemon *qdaemon;
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boolean *pfexit;
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size_t *pcneed;
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{
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int cinbuf, cfirst, clen;
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*pfexit = FALSE;
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cinbuf = iPrecend - iPrecstart;
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if (cinbuf < 0)
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cinbuf += CRECBUFLEN;
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if (! fEfile)
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{
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/* We are not receiving a file. Commands continue up to a null
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byte. */
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while (cinbuf > 0)
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{
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char *pnull;
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cfirst = CRECBUFLEN - iPrecstart;
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if (cfirst > cinbuf)
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cfirst = cinbuf;
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pnull = memchr (abPrecbuf + iPrecstart, '\0', (size_t) cfirst);
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if (pnull != NULL)
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cfirst = pnull - (abPrecbuf + iPrecstart) + 1;
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DEBUG_MESSAGE1 (DEBUG_PROTO,
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"feprocess_data: Got %d command bytes",
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cfirst);
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if (! fgot_data (qdaemon, abPrecbuf + iPrecstart,
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(size_t) cfirst, (const char *) NULL, (size_t) 0,
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-1, -1, (long) -1, TRUE, pfexit))
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return FALSE;
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iPrecstart = (iPrecstart + cfirst) % CRECBUFLEN;
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if (*pfexit)
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return TRUE;
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cinbuf = iPrecend - iPrecstart;
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if (cinbuf < 0)
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cinbuf += CRECBUFLEN;
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}
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if (pcneed != NULL)
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*pcneed = 1;
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return TRUE;
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}
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/* Here we are receiving a file. We want cEbytes in total. If we
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don't have cEbytes yet, we have to get it first. */
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if (cEbytes == -1)
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{
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char ab[CEFRAMELEN + 1];
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if (cinbuf < CEFRAMELEN)
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{
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if (pcneed != NULL)
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*pcneed = CEFRAMELEN - cinbuf;
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return TRUE;
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}
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cfirst = CRECBUFLEN - iPrecstart;
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if (cfirst >= CEFRAMELEN)
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memcpy (ab, abPrecbuf + iPrecstart, (size_t) CEFRAMELEN);
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else
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{
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memcpy (ab, abPrecbuf + iPrecstart, (size_t) cfirst);
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memcpy (ab + cfirst, abPrecbuf, (size_t) CEFRAMELEN - cfirst);
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}
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ab[CEFRAMELEN] = '\0';
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cEbytes = strtol (ab, (char **) NULL, 10);
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iPrecstart = (iPrecstart + CEFRAMELEN) % CRECBUFLEN;
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cinbuf = iPrecend - iPrecstart;
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if (cinbuf < 0)
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cinbuf += CRECBUFLEN;
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}
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/* Here we can read real data for the file. */
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while (cinbuf > 0)
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{
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clen = cinbuf;
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if ((long) clen > cEbytes)
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clen = (int) cEbytes;
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cfirst = CRECBUFLEN - iPrecstart;
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if (cfirst > clen)
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cfirst = clen;
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DEBUG_MESSAGE1 (DEBUG_PROTO,
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"feprocess_data: Got %d data bytes",
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clen);
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if (! fgot_data (qdaemon, abPrecbuf + iPrecstart,
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(size_t) cfirst, abPrecbuf, (size_t) (clen - cfirst),
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-1, -1, (long) -1, TRUE, pfexit))
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return FALSE;
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iPrecstart = (iPrecstart + clen) % CRECBUFLEN;
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cEbytes -= clen;
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if (cEbytes == 0)
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{
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if (! fgot_data (qdaemon, abPrecbuf, (size_t) 0,
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(const char *) NULL, (size_t) 0,
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-1, -1, (long) -1, TRUE, pfexit))
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return FALSE;
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if (*pfexit)
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return TRUE;
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}
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cinbuf -= clen;
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}
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if (pcneed != NULL)
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{
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if (cEbytes > CRECBUFLEN / 2)
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*pcneed = CRECBUFLEN / 2;
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else
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*pcneed = (int) cEbytes;
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}
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return TRUE;
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}
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/* Wait for data to come in and process it until we've reached the end
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of a command or a file. */
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boolean
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fewait (qdaemon)
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struct sdaemon *qdaemon;
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{
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while (TRUE)
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{
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boolean fexit;
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size_t cneed, crec;
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if (! feprocess_data (qdaemon, &fexit, &cneed))
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return FALSE;
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if (fexit)
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return TRUE;
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if (! freceive_data (qdaemon->qconn, cneed, &crec, cEtimeout, TRUE))
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return FALSE;
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if (crec == 0)
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{
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ulog (LOG_ERROR, "Timed out waiting for data");
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return FALSE;
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}
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}
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}
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/* File level routine, to handle transferring the amount of data and
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to set fEfile correctly. */
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boolean
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fefile (qdaemon, qtrans, fstart, fsend, cbytes, pfhandled)
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struct sdaemon *qdaemon;
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struct stransfer *qtrans;
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boolean fstart;
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boolean fsend;
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long cbytes;
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boolean *pfhandled;
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{
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*pfhandled = FALSE;
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if (fstart)
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{
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if (fsend)
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{
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char ab[CEFRAMELEN];
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DEBUG_MESSAGE1 (DEBUG_PROTO,
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"Protocol 'e' starting to send %ld bytes",
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cbytes);
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bzero (ab, (size_t) CEFRAMELEN);
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sprintf (ab, "%ld", cbytes);
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if (! fsend_data (qdaemon->qconn, ab, (size_t) CEFRAMELEN, TRUE))
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return FALSE;
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cEbytes = cbytes;
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}
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else
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{
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cEbytes = -1;
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fEfile = TRUE;
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}
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}
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else
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{
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if (! fsend)
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fEfile = FALSE;
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#if DEBUG > 0
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if (cEbytes != 0)
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{
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ulog (LOG_ERROR,
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"Protocol 'e' internal error: %ld bytes left over",
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cEbytes);
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return FALSE;
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}
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#endif
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}
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return TRUE;
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}
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