242 lines
6.4 KiB
C
242 lines
6.4 KiB
C
/* prot.c
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Protocol support routines to move commands and data around.
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Copyright (C) 1991, 1992, 1994 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 Cygnus Support, Building 200, 1 Kendall Square, Cambridge, MA 02139.
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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 prot_rcsid[] = "$Id: prot.c,v 1.30 1994/04/14 03:07:56 ian Rel $";
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#endif
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#include <errno.h>
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#include "uudefs.h"
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#include "uuconf.h"
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#include "system.h"
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#include "conn.h"
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#include "prot.h"
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/* Variables visible to the protocol-specific routines. */
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/* Buffer to hold received data. */
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char abPrecbuf[CRECBUFLEN];
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/* Index of start of data in abPrecbuf. */
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int iPrecstart;
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/* Index of end of data (first byte not included in data) in abPrecbuf. */
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int iPrecend;
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/* We want to output and input at the same time, if supported on this
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machine. If we have something to send, we send it all while
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accepting a large amount of data. Once we have sent everything we
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look at whatever we have received. If data comes in faster than we
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can send it, we may run out of buffer space. */
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boolean
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fsend_data (qconn, zsend, csend, fdoread)
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struct sconnection *qconn;
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const char *zsend;
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size_t csend;
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boolean fdoread;
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{
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if (! fdoread)
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return fconn_write (qconn, zsend, csend);
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while (csend > 0)
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{
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size_t crec, csent;
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if (iPrecend < iPrecstart)
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crec = iPrecstart - iPrecend - 1;
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else
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{
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crec = CRECBUFLEN - iPrecend;
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if (iPrecstart == 0)
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--crec;
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}
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if (crec == 0)
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return fconn_write (qconn, zsend, csend);
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csent = csend;
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if (! fconn_io (qconn, zsend, &csent, abPrecbuf + iPrecend, &crec))
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return FALSE;
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csend -= csent;
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zsend += csent;
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iPrecend = (iPrecend + crec) % CRECBUFLEN;
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}
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return TRUE;
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}
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/* Read data from the other system when we have nothing to send. The
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argument cneed is the amount of data the caller wants, and ctimeout
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is the timeout in seconds. The function sets *pcrec to the amount
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of data which was actually received, which may be less than cneed
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if there isn't enough room in the receive buffer. If no data is
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received before the timeout expires, *pcrec will be returned as 0.
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If an error occurs, the function returns FALSE. If the freport
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argument is FALSE, no error should be reported. */
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boolean
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freceive_data (qconn, cneed, pcrec, ctimeout, freport)
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struct sconnection *qconn;
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size_t cneed;
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size_t *pcrec;
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int ctimeout;
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boolean freport;
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{
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/* Set *pcrec to the maximum amount of data we can read. fconn_read
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expects *pcrec to be the buffer size, and sets it to the amount
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actually received. */
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if (iPrecend < iPrecstart)
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*pcrec = iPrecstart - iPrecend - 1;
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else
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{
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*pcrec = CRECBUFLEN - iPrecend;
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if (iPrecstart == 0)
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--(*pcrec);
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}
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#if DEBUG > 0
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/* If we have no room in the buffer, we're in trouble. The
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protocols must be written to ensure that this can't happen. */
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if (*pcrec == 0)
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ulog (LOG_FATAL, "freceive_data: No room in buffer");
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#endif
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/* If we don't have room for all the data the caller wants, we
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simply have to expect less. We'll get the rest later. */
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if (*pcrec < cneed)
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cneed = *pcrec;
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if (! fconn_read (qconn, abPrecbuf + iPrecend, pcrec, cneed, ctimeout,
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freport))
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return FALSE;
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iPrecend = (iPrecend + *pcrec) % CRECBUFLEN;
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return TRUE;
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}
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/* Read a single character. Get it out of the receive buffer if it's
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there, otherwise ask freceive_data for at least one character.
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This is used because as a protocol is shutting down freceive_data
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may read ahead and eat characters that should be read outside the
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protocol routines. We call freceive_data rather than fconn_read
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with an argument of 1 so that we can get all the available data in
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a single system call. The ctimeout argument is the timeout in
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seconds; the freport argument is FALSE if no error should be
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reported. This returns a character, or -1 on timeout or -2 on
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error. */
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int
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breceive_char (qconn, ctimeout, freport)
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struct sconnection *qconn;
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int ctimeout;
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boolean freport;
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{
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char b;
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if (iPrecstart == iPrecend)
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{
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size_t crec;
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if (! freceive_data (qconn, sizeof (char), &crec, ctimeout, freport))
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return -2;
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if (crec == 0)
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return -1;
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}
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b = abPrecbuf[iPrecstart];
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iPrecstart = (iPrecstart + 1) % CRECBUFLEN;
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return BUCHAR (b);
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}
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/* Send mail about a file transfer. We send to the given mailing
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address if there is one, otherwise to the user. */
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boolean
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fmail_transfer (fsuccess, zuser, zmail, zwhy, zfromfile, zfromsys,
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ztofile, ztosys, zsaved)
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boolean fsuccess;
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const char *zuser;
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const char *zmail;
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const char *zwhy;
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const char *zfromfile;
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const char *zfromsys;
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const char *ztofile;
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const char *ztosys;
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const char *zsaved;
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{
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const char *zsendto;
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const char *az[20];
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int i;
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if (zmail != NULL && *zmail != '\0')
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zsendto = zmail;
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else
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zsendto = zuser;
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i = 0;
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az[i++] = "The file\n\t";
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if (zfromsys != NULL)
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{
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az[i++] = zfromsys;
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az[i++] = "!";
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}
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az[i++] = zfromfile;
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if (fsuccess)
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az[i++] = "\nwas successfully transferred to\n\t";
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else
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az[i++] = "\ncould not be transferred to\n\t";
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if (ztosys != NULL)
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{
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az[i++] = ztosys;
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az[i++] = "!";
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}
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az[i++] = ztofile;
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az[i++] = "\nas requested by\n\t";
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az[i++] = zuser;
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if (! fsuccess)
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{
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az[i++] = "\nfor the following reason:\n\t";
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az[i++] = zwhy;
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az[i++] = "\n";
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}
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if (zsaved != NULL)
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{
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az[i++] = zsaved;
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az[i++] = "\n";
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}
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return fsysdep_mail (zsendto,
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fsuccess ? "UUCP succeeded" : "UUCP failed",
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i, az);
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}
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