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/* seq.c
Get and increment the conversation sequence number for a system.
Copyright (C) 1991, 1992, 1993 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 Cygnus Support, Building 200, 1 Kendall Square, Cambridge, MA 02139.
*/
#include "uucp.h"
#include "uudefs.h"
#include "uuconf.h"
#include "sysdep.h"
#include "system.h"
#include <errno.h>
/* Get the current conversation sequence number for a remote system,
and increment it for next time. The conversation sequence number
is kept in a file named for the system in the directory .Sequence
in the spool directory. This is not compatible with other versions
of UUCP, but it makes more sense to me. The sequence file is only
used if specified in the information for that system. */
long
ixsysdep_get_sequence (qsys)
const struct uuconf_system *qsys;
{
FILE *e;
char *zname;
struct stat s;
long iseq;
/* This will only be called when the system is locked anyhow, so there
is no need to use a separate lock for the conversation sequence
file. */
zname = zsysdep_in_dir (".Sequence", qsys->uuconf_zname);
iseq = 0;
if (stat (zname, &s) == 0)
{
boolean fok;
char *zline;
size_t cline;
/* The file should only be readable and writable by uucp. */
if ((s.st_mode & (S_IRWXG | S_IRWXO)) != 0)
{
ulog (LOG_ERROR,
"Bad file protection for conversation sequence file");
ubuffree (zname);
return -1;
}
e = fopen (zname, "r+");
if (e == NULL)
{
ulog (LOG_ERROR, "fopen (%s): %s", zname, strerror (errno));
ubuffree (zname);
return -1;
}
ubuffree (zname);
fok = TRUE;
zline = NULL;
cline = 0;
if (getline (&zline, &cline, e) <= 0)
fok = FALSE;
else
{
char *zend;
iseq = strtol (zline, &zend, 10);
if (zend == zline)
fok = FALSE;
}
xfree ((pointer) zline);
if (! fok)
{
ulog (LOG_ERROR, "Bad format for conversation sequence file");
(void) fclose (e);
return -1;
}
rewind (e);
}
else
{
e = esysdep_fopen (zname, FALSE, FALSE, TRUE);
ubuffree (zname);
if (e == NULL)
return -1;
}
++iseq;
fprintf (e, "%ld", iseq);
if (fclose (e) != 0)
{
ulog (LOG_ERROR, "fclose: %s", strerror (errno));
return -1;
}
return iseq;
}
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