tf_init, tf_get_pname, tf_get_pinst, tf_get_cred, tf_close - routines
for manipulating a Kerberos ticket file
extern char *krb_err_txt;
This group of routines are provided to manipulate the Kerberos tickets
file. A ticket file has the following format:
principal's name (null-terminated string)
principal's instance (null-terminated string)
Where "CREDENTIAL_x" consists of the following fixed-length
fields from the CREDENTIALS structure (defined in <kerberosIV/krb.h>):
tf_init must be called before the other ticket file routines. It takes
the name of the ticket file to use, and a read/write flag as arguments.
It tries to open the ticket file, checks the mode and if everything is
okay, locks the file. If it's opened for reading, the lock is shared.
If it's opened for writing, the lock is exclusive. KSUCCESS is
returned if all went well, otherwise one of the following:
NO_TKT_FIL - file wasn't there
TKT_FIL_ACC - file was in wrong mode, etc.
TKT_FIL_LCK - couldn't lock the file, even after a retry
The tf_get_pname reads the principal's name from a ticket file. It
should only be called after tf_init has been called. The principal's
name is filled into the pname parameter. If all goes well, KSUCCESS is
returned. If tf_init wasn't called, TKT_FIL_INI is returned. If the
principal's name was null, or EOF was encountered, or the name was
longer than ANAME_SZ, TKT_FIL_FMT is returned.
The tf_get_pinst reads the principal's instance from a ticket file. It
should only be called after tf_init and tf_get_pname have been called.
The principal's instance is filled into the pinst parameter. If all
goes well, KSUCCESS is returned. If tf_init wasn't called, TKT_FIL_INI
is returned. If EOF was encountered, or the name was longer than
INST_SZ, TKT_FIL_FMT is returned. Note that, unlike the principal
name, the instance name may be null.
The tf_get_cred routine reads a CREDENTIALS record from a ticket file
and fills in the given structure. It should only be called after
tf_init, tf_get_pname, and tf_get_pinst have been called. If all goes
well, KSUCCESS is returned. Possible error codes are:
TKT_FIL_INI - tf_init wasn't called first
TKT_FIL_FMT - bad format
EOF - end of file encountered
tf_close closes the ticket file and releases the lock on it.
The ticket file routines have to be called in a certain order.
Jennifer Steiner, MIT Project Athena
Bill Bryant, MIT Project Athena
Copyright 1987 Massachusetts Institute of Technology
MIT Project Athena Kerberos Version 4.0 TF_UTIL(3)