109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
/*
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Copyright (C) 1989 by the Massachusetts Institute of Technology
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Export of this software from the United States of America is assumed
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to require a specific license from the United States Government.
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It is the responsibility of any person or organization contemplating
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export to obtain such a license before exporting.
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WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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distribute this software and its documentation for any purpose and
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without fee is hereby granted, provided that the above copyright
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notice appear in all copies and that both that copyright notice and
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this permission notice appear in supporting documentation, and that
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the name of M.I.T. not be used in advertising or publicity pertaining
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to distribution of the software without specific, written prior
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permission. M.I.T. makes no representations about the suitability of
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this software for any purpose. It is provided "as is" without express
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or implied warranty.
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*/
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#include "krb_locl.h"
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RCSID("$Id: dest_tkt.c,v 1.1.1.3 2001/09/17 12:09:53 assar Exp $");
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/*
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* dest_tkt() is used to destroy the ticket store upon logout.
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* If the ticket file does not exist, dest_tkt() returns RET_TKFIL.
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* Otherwise the function returns RET_OK on success, KFAILURE on
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* failure.
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*
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* The ticket file (TKT_FILE) is defined in "krb.h".
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*/
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int
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dest_tkt(void)
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{
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const char *filename = TKT_FILE;
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int i, fd;
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struct stat sb1, sb2;
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char buf[BUFSIZ];
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int error = 0;
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if (lstat (filename, &sb1) < 0) {
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error = errno;
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goto out;
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}
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fd = open (filename, O_RDWR | O_BINARY);
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if (fd < 0) {
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error = errno;
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goto out;
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}
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if (unlink (filename) < 0) {
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error = errno;
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close(fd);
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goto out;
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}
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if (fstat (fd, &sb2) < 0) {
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error = errno;
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close(fd);
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goto out;
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}
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if (sb1.st_dev != sb2.st_dev || sb1.st_ino != sb2.st_ino) {
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close (fd);
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error = EPERM;
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goto out;
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}
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if (sb2.st_nlink != 0) {
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close (fd);
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error = EPERM;
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goto out;
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}
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for (i = 0; i < sb2.st_size; i += sizeof(buf)) {
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int ret;
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ret = write(fd, buf, sizeof(buf));
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if (ret != sizeof(buf)) {
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if (ret < 0)
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error = errno;
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else
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error = EINVAL;
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fsync(fd);
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close(fd);
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goto out;
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}
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}
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fsync(fd);
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close(fd);
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out:
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if (error == ENOENT)
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return RET_TKFIL;
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else if (error != 0)
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return KFAILURE;
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else
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return(KSUCCESS);
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}
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