Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
d610a47911
NetBSD/gnu/libexec/uucp/prott.c

376 lines
9.0 KiB
C
Raw Normal View History

initial import of 386bsd-0.1 sources
1993-03-21 12:45:37 +03:00
/* prott.c
The 't' 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: prott.c,v $
Revision 1.1.1.1 1993/03/21 09:45:37 cgd
initial import of 386bsd-0.1 sources
Revision 1.16 1992/03/30 04:49:10 ian
Niels Baggesen: added debugging types abnormal and uucp-proto
Revision 1.15 1992/03/17 01:03:03 ian
Miscellaneous cleanup
Revision 1.14 1992/03/13 22:59:25 ian
Have breceive_char go through freceive_data
Revision 1.13 1992/03/12 19:56:10 ian
Debugging based on types rather than number
Revision 1.12 1992/02/08 19:55:32 ian
Shifts of integers by more than 15 are not portable
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 1991/12/31 19:34:19 ian
Added number of bytes to pffile protocol entry point
Revision 1.8 1991/12/28 03:49:23 ian
Added HAVE_MEMFNS and HAVE_BFNS; changed uses of memset to bzero
Revision 1.7 1991/12/17 22:13:14 ian
David Nugent: zero out garbage before sending data
Revision 1.6 1991/11/16 00:31:01 ian
Increased default 't' and 'f' protocol timeouts
Revision 1.5 1991/11/15 23:27:21 ian
Include system.h in prott.c and protf.c
Revision 1.4 1991/11/15 23:20:59 ian
Changed sleep to usysdep_sleep
Revision 1.3 1991/11/15 21:00:59 ian
Efficiency hacks for 'f' and 't' protocols
Revision 1.2 1991/11/13 20:44:20 ian
Learned author
Revision 1.1 1991/11/12 18:26:03 ian
Initial revision
*/
#include "uucp.h"
#if USE_RCS_ID
char prott_rcsid[] = "$Id: prott.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 code written by Rick Adams.
This code implements the 't' protocol, which 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 unadvisable, since errors can occur between the modem and
the computer. */
/* The buffer size we use. */
#define CTBUFSIZE (1024)
/* The offset in the buffer to the data. */
#define CTFRAMELEN (4)
/* Commands are sent in multiples of this size. */
#define CTPACKSIZE (512)
/* A pointer to the buffer we will use. */
static char *zTbuf;
/* True if we are receiving a file. */
static boolean fTfile;
/* The timeout we use. */
static int cTtimeout = 120;
struct scmdtab asTproto_params[] =
{
{ "timeout", CMDTABTYPE_INT, (pointer) &cTtimeout, NULL },
{ NULL, 0, NULL, NULL }
};
/* Local function. */
static boolean ftprocess_data P((boolean *pfexit, int *pcneed));
/* Start the protocol. */
/*ARGSUSED*/
boolean
ftstart (fmaster)
boolean fmaster;
{
if (! fport_set (PORTSETTING_EIGHT))
return FALSE;
zTbuf = (char *) xmalloc (CTBUFSIZE + CTFRAMELEN);
/* The first two bytes of the buffer are always zero. */
zTbuf[0] = 0;
zTbuf[1] = 0;
fTfile = FALSE;
usysdep_sleep (2);
return TRUE;
}
/* Stop the protocol. */
boolean
ftshutdown ()
{
xfree ((pointer) zTbuf);
zTbuf = NULL;
return TRUE;
}
/* Send a command string. We send everything up to and including the
null byte. The number of bytes we send must be a multiple of
TPACKSIZE. */
boolean
ftsendcmd (z)
const char *z;
{
int clen;
char *zalc;
DEBUG_MESSAGE1 (DEBUG_UUCP_PROTO, "ftsendcmd: Sending command \"%s\"", z);
clen = strlen (z);
/* We need to send the smallest multiple of CTPACKSIZE which is
greater than clen (not equal to clen, since we need room for the
null byte). */
clen = ((clen / CTPACKSIZE) + 1) * CTPACKSIZE;
zalc = (char *) alloca (clen);
bzero (zalc, clen);
strcpy (zalc, z);
return fsend_data (zalc, clen, TRUE);
}
/* Get space to be filled with data. We provide a buffer which has
four bytes at the start available to hold the length. */
char *
ztgetspace (pclen)
int *pclen;
{
*pclen = CTBUFSIZE;
return zTbuf + CTFRAMELEN;
}
/* Send out some data. We are allowed to modify the four bytes
preceding the buffer. This allows us to send the entire block with
header bytes in a single call. */
boolean
ftsenddata (zdata, cdata)
char *zdata;
int cdata;
{
/* Here we do htonl by hand, since it doesn't exist everywhere. We
know that the amount of data cannot be greater than CTBUFSIZE, so
the first two bytes of this value will always be 0. They were
set to 0 in ftstart so we don't touch them here. This is useful
because we cannot portably right shift by 24 or 16, since we
might be dealing with sixteen bit integers. */
zdata[-2] = (char) ((cdata >> 8) & 0xff);
zdata[-1] = (char) (cdata & 0xff);
/* 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 - CTFRAMELEN, cdata + CTFRAMELEN, FALSE);
}
/* Process any data in the receive buffer. */
boolean
ftprocess (pfexit)
boolean *pfexit;
{
return ftprocess_data (pfexit, (int *) NULL);
}
/* Process data and return the amount we need in *pfneed. */
static boolean
ftprocess_data (pfexit, pcneed)
boolean *pfexit;
int *pcneed;
{
int cinbuf, cfirst, clen;
*pfexit = FALSE;
cinbuf = iPrecend - iPrecstart;
if (cinbuf < 0)
cinbuf += CRECBUFLEN;
if (! fTfile)
{
/* We are not receiving a file. Commands are read in chunks of
CTPACKSIZE. */
while (cinbuf >= CTPACKSIZE)
{
cfirst = CRECBUFLEN - iPrecstart;
if (cfirst > CTPACKSIZE)
cfirst = CTPACKSIZE;
DEBUG_MESSAGE1 (DEBUG_PROTO,
"ftprocess_data: Got %d command bytes",
cfirst);
if (! fgot_data (abPrecbuf + iPrecstart, cfirst, TRUE, FALSE,
pfexit))
return FALSE;
if (cfirst < CTPACKSIZE && ! *pfexit)
{
if (! fgot_data (abPrecbuf, CTPACKSIZE - cfirst, TRUE, FALSE,
pfexit))
return FALSE;
}
iPrecstart = (iPrecstart + CTPACKSIZE) % CRECBUFLEN;
if (*pfexit)
return TRUE;
cinbuf -= CTPACKSIZE;
}
if (pcneed != NULL)
*pcneed = CTPACKSIZE - cinbuf;
return TRUE;
}
/* Here we are receiving a file. The data comes in blocks. The
first four bytes contain the length, followed by that amount of
data. */
while (cinbuf >= CTFRAMELEN)
{
/* The length is stored in network byte order, MSB first. */
clen = (((((((abPrecbuf[iPrecstart] & 0xff) << 8)
+ (abPrecbuf[(iPrecstart + 1) % CRECBUFLEN] & 0xff)) << 8)
+ (abPrecbuf[(iPrecstart + 2) % CRECBUFLEN] & 0xff)) << 8)
+ (abPrecbuf[(iPrecstart + 3) % CRECBUFLEN] & 0xff));
if (cinbuf < clen + CTFRAMELEN)
{
if (pcneed != NULL)
*pcneed = clen + CTFRAMELEN - cinbuf;
return TRUE;
}
iPrecstart = (iPrecstart + CTFRAMELEN) % CRECBUFLEN;
cfirst = CRECBUFLEN - iPrecstart;
if (cfirst > clen)
cfirst = clen;
DEBUG_MESSAGE1 (DEBUG_PROTO,
"ftprocess_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;
if (*pfexit)
return TRUE;
cinbuf -= clen + CTFRAMELEN;
}
if (pcneed != NULL)
*pcneed = CTFRAMELEN - cinbuf;
return TRUE;
}
/* Wait for data to come in and process it until we've reached the end
of a command or a file. */
boolean
ftwait ()
{
while (TRUE)
{
boolean fexit;
int cneed, crec;
if (! ftprocess_data (&fexit, &cneed))
return FALSE;
if (fexit)
return TRUE;
if (! freceive_data (cneed, &crec, cTtimeout, TRUE))
return FALSE;
if (crec == 0)
{
ulog (LOG_ERROR, "Timed out waiting for data");
return FALSE;
}
}
}
/* File level routine, to set fTfile correctly. */
/*ARGSUSED*/
boolean
ftfile (fstart, fsend, pfredo, cbytes)
boolean fstart;
boolean fsend;
boolean *pfredo;
long cbytes;
{
if (pfredo != NULL)
*pfredo = FALSE;
if (! fsend)
fTfile = fstart;
return TRUE;
}
Reference in New Issue Copy Permalink