/* 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 only in , 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; }