/* Copyright (C) 1989 by the Massachusetts Institute of Technology Export of this software from the United States of America is assumed to require a specific license from the United States Government. It is the responsibility of any person or organization contemplating export to obtain such a license before exporting. WITHIN THAT CONSTRAINT, permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of M.I.T. not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. M.I.T. makes no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty. */ #include "krb_locl.h" RCSID("$Id: dest_tkt.c,v 1.11.14.2 2000/10/18 20:26:42 assar Exp $"); #ifndef O_BINARY #define O_BINARY 0 #endif /* * dest_tkt() is used to destroy the ticket store upon logout. * If the ticket file does not exist, dest_tkt() returns RET_TKFIL. * Otherwise the function returns RET_OK on success, KFAILURE on * failure. * * The ticket file (TKT_FILE) is defined in "krb.h". */ int dest_tkt(void) { const char *filename = TKT_FILE; int i, fd; struct stat sb1, sb2; char buf[BUFSIZ]; int error = 0; if (lstat (filename, &sb1) < 0) { error = errno; goto out; } fd = open (filename, O_RDWR | O_BINARY); if (fd < 0) { error = errno; goto out; } if (unlink (filename) < 0) { error = errno; close(fd); goto out; } if (fstat (fd, &sb2) < 0) { error = errno; close(fd); goto out; } if (sb1.st_dev != sb2.st_dev || sb1.st_ino != sb2.st_ino) { close (fd); error = EPERM; goto out; } if (sb2.st_nlink != 0) { close (fd); error = EPERM; goto out; } for (i = 0; i < sb2.st_size; i += sizeof(buf)) { int ret; ret = write(fd, buf, sizeof(buf)); if (ret != sizeof(buf)) { if (ret < 0) error = errno; else error = EINVAL; fsync(fd); close(fd); goto out; } } fsync(fd); close(fd); out: if (error == ENOENT) return RET_TKFIL; else if (error != 0) return KFAILURE; else return(KSUCCESS); }