/* 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 only in , 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; }