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Annotation of coherent/g/usr/lib/uucp/tay104/unix/recep.c, revision 1.1

1.1     ! root        1: /* recep.c
        !             2:    See whether a file has already been received.
        !             3: 
        !             4:    Copyright (C) 1992 Ian Lance Taylor
        !             5: 
        !             6:    This file is part of the Taylor UUCP package.
        !             7: 
        !             8:    This program is free software; you can redistribute it and/or
        !             9:    modify it under the terms of the GNU General Public License as
        !            10:    published by the Free Software Foundation; either version 2 of the
        !            11:    License, or (at your option) any later version.
        !            12: 
        !            13:    This program is distributed in the hope that it will be useful, but
        !            14:    WITHOUT ANY WARRANTY; without even the implied warranty of
        !            15:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
        !            16:    General Public License for more details.
        !            17: 
        !            18:    You should have received a copy of the GNU General Public License
        !            19:    along with this program; if not, write to the Free Software
        !            20:    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !            21: 
        !            22:    The author of the program may be contacted at [email protected] or
        !            23:    c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
        !            24:    */
        !            25: 
        !            26: #include "uucp.h"
        !            27: 
        !            28: #include "uudefs.h"
        !            29: #include "uuconf.h"
        !            30: #include "sysdep.h"
        !            31: #include "system.h"
        !            32: 
        !            33: #include <errno.h>
        !            34: 
        !            35: #if HAVE_TIME_H
        !            36: #include <time.h>
        !            37: #endif
        !            38: 
        !            39: #if HAVE_FCNTL_H
        !            40: #include <fcntl.h>
        !            41: #else
        !            42: #if HAVE_SYS_FILE_H
        !            43: #include <sys/file.h>
        !            44: #endif
        !            45: #endif
        !            46: 
        !            47: static char *zsreceived_name P((const struct uuconf_system *qsys,
        !            48:                                const char *ztemp));
        !            49: 
        !            50: /* These routines are used to see whether we have already received a
        !            51:    file in a previous UUCP connection.  It is possible for the
        !            52:    acknowledgement of a received file to be lost.  The sending system
        !            53:    will then now know that the file was correctly received, and will
        !            54:    send it again.  This can be a problem particularly with protocols
        !            55:    which support channels, since they may send several small files in
        !            56:    a single window, all of which may be received correctly although
        !            57:    the sending system never sees the acknowledgement.  If these files
        !            58:    involve an execution, the execution will happen twice, which will
        !            59:    be bad.
        !            60: 
        !            61:    We use a simple system.  For each file we want to remember, we
        !            62:    create an empty file names .Received/SYS/TEMP, where SYS is the
        !            63:    name of the system and TEMP is the name of the temporary file used
        !            64:    by the sender.  If no temporary file is used by the sender, we
        !            65:    don't remember that we received the file.  This is not perfect, but
        !            66:    execution files will always have a temporary file, so the most
        !            67:    important case is handled.  Also, any file received from Taylor
        !            68:    UUCP 1.04 or greater will always have a temporary file.  */
        !            69: 
        !            70: /* Return the name we are going use for the marker, or NULL if we have
        !            71:    no name.  */
        !            72: 
        !            73: static char *
        !            74: zsreceived_name (qsys, ztemp)
        !            75:      const struct uuconf_system *qsys;
        !            76:      const char *ztemp;
        !            77: {
        !            78:   if (ztemp != NULL
        !            79:       && *ztemp == 'D'
        !            80:       && strcmp (ztemp, "D.0") != 0)
        !            81:     return zsappend3 (".Received", qsys->uuconf_zname, ztemp);
        !            82:   else
        !            83:     return NULL;
        !            84: }
        !            85: 
        !            86: /* Remember that we have already received a file.  */
        !            87: 
        !            88: /*ARGSUSED*/
        !            89: boolean
        !            90: fsysdep_remember_reception (qsys, zto, ztemp)
        !            91:      const struct uuconf_system *qsys;
        !            92:      const char *zto;
        !            93:      const char *ztemp;
        !            94: {
        !            95:   char *zfile;
        !            96:   int o;
        !            97: 
        !            98:   zfile = zsreceived_name (qsys, ztemp);
        !            99:   if (zfile == NULL)
        !           100:     return TRUE;
        !           101:   o = creat (zfile, IPUBLIC_FILE_MODE);
        !           102:   if (o < 0)
        !           103:     {
        !           104:       if (errno == ENOENT)
        !           105:        {
        !           106:          if (fsysdep_make_dirs (zfile, TRUE))
        !           107:            {
        !           108:              ubuffree (zfile);
        !           109:              return FALSE;
        !           110:            }
        !           111:          o = creat (zfile, IPUBLIC_FILE_MODE);
        !           112:        }
        !           113:       if (o < 0)
        !           114:        {
        !           115:          ulog (LOG_ERROR, "creat (%s): %s", zfile, strerror (errno));
        !           116:          ubuffree (zfile);
        !           117:          return FALSE;
        !           118:        }
        !           119:     }
        !           120: 
        !           121:   ubuffree (zfile);
        !           122: 
        !           123:   /* We don't have to actually put anything in the file; we just use
        !           124:      the name.  This is more convenient than keeping a file with a
        !           125:      list of names.  */
        !           126:   if (close (o) < 0)
        !           127:     {
        !           128:       ulog (LOG_ERROR, "fsysdep_remember_reception: close: %s",
        !           129:            strerror (errno));
        !           130:       return FALSE;
        !           131:     }
        !           132: 
        !           133:   return TRUE;
        !           134: }
        !           135: 
        !           136: /* See if we have already received a file.  Note that don't delete the
        !           137:    marker file here, because we need to know that the sending system
        !           138:    has received our denial first.  This function returns TRUE if the
        !           139:    file has already been received, FALSE if it has not.  */
        !           140: 
        !           141: /*ARGSUSED*/
        !           142: boolean
        !           143: fsysdep_already_received (qsys, zto, ztemp)
        !           144:      const struct uuconf_system *qsys;
        !           145:      const char *zto;
        !           146:      const char *ztemp;
        !           147: {
        !           148:   char *zfile;
        !           149:   struct stat s;
        !           150:   boolean fret;
        !           151: 
        !           152:   zfile = zsreceived_name (qsys, ztemp);
        !           153:   if (zfile == NULL)
        !           154:     return FALSE;
        !           155:   if (stat (zfile, &s) < 0)
        !           156:     {
        !           157:       if (errno != ENOENT)
        !           158:        ulog (LOG_ERROR, "stat (%s): %s", zfile, strerror (errno));
        !           159:       ubuffree (zfile);
        !           160:       return FALSE;
        !           161:     }
        !           162: 
        !           163:   /* Ignore the file (return FALSE) if it is over one week old.  */
        !           164:   fret = s.st_mtime + 7 * 24 * 60 * 60 >= time ((time_t *) NULL);
        !           165: 
        !           166:   if (fret)
        !           167:     DEBUG_MESSAGE1 (DEBUG_SPOOLDIR, "fsysdep_already_received: Found %s",
        !           168:                    zfile);
        !           169: 
        !           170:   ubuffree (zfile);
        !           171: 
        !           172:   return fret;
        !           173: }
        !           174: 
        !           175: /* Forget that we have received a file.  */
        !           176: 
        !           177: /*ARGSUSED*/
        !           178: boolean
        !           179: fsysdep_forget_reception (qsys, zto, ztemp)
        !           180:      const struct uuconf_system *qsys;
        !           181:      const char *zto;
        !           182:      const char *ztemp;
        !           183: {
        !           184:   char *zfile;
        !           185: 
        !           186:   zfile = zsreceived_name (qsys, ztemp);
        !           187:   if (zfile == NULL)
        !           188:     return TRUE;
        !           189:   if (remove (zfile) < 0
        !           190:       && errno != ENOENT)
        !           191:     {
        !           192:       ulog (LOG_ERROR, "remove (%s): %s", zfile, strerror (errno));
        !           193:       ubuffree (zfile);
        !           194:       return FALSE;
        !           195:     }
        !           196:   return TRUE;
        !           197: }

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