/* Run one invocation of the callback, unlocking the mutex and possibly the DB
* around the invocation. */
static krb5_error_code
curs_run_cb(iter_curs *curs, ctx_iterate_cb func, krb5_pointer func_arg)
{
krb5_db2_context *dbc = curs->dbc;
krb5_error_code retval, lockerr;
krb5_db_entry *entry;
krb5_context ctx = curs->ctx;
krb5_data contdata;
contdata = make_data(curs->data.data, curs->data.size);
retval = krb5_decode_princ_entry(ctx, &contdata, &entry);
if (retval)
return retval;
/* Save libdb key across possible DB closure. */
retval = curs_save(curs);
if (retval)
return retval;
if (dbc->unlockiter)
curs_unlock(curs);
k5_mutex_unlock(krb5_db2_mutex);
retval = (*func)(func_arg, entry);
krb5_db2_free(ctx, entry);
k5_mutex_lock(krb5_db2_mutex);
if (dbc->unlockiter) {
lockerr = curs_lock(curs);
if (lockerr)
return lockerr;
}
return retval;
}
/* Set up curs and lock DB. */
static krb5_error_code
curs_init(iter_curs *curs, krb5_context ctx, krb5_db2_context *dbc,
krb5_flags iterflags)
{
int isrecurse = iterflags & KRB5_DB_ITER_RECURSE;
unsigned int prevflag = R_PREV;
unsigned int nextflag = R_NEXT;
curs->keycopy.size = 0;
curs->keycopy.data = NULL;
curs->islocked = FALSE;
curs->ctx = ctx;
curs->dbc = dbc;
if (iterflags & KRB5_DB_ITER_WRITE)
curs->lockmode = KRB5_LOCKMODE_EXCLUSIVE;
else
curs->lockmode = KRB5_LOCKMODE_SHARED;
if (isrecurse) {
#ifdef R_RNEXT
if (dbc->hashfirst) {
k5_setmsg(ctx, EINVAL, _("Recursive iteration is not supported "
"for hash databases"));
return EINVAL;
}
prevflag = R_RPREV;
nextflag = R_RNEXT;
#else
k5_setmsg(ctx, EINVAL, _("Recursive iteration not supported "
"in this version of libdb"));
return EINVAL;
#endif
}
if (iterflags & KRB5_DB_ITER_REV) {
curs->startflag = R_LAST;
curs->stepflag = prevflag;
} else {
curs->startflag = R_FIRST;
curs->stepflag = nextflag;
}
return curs_lock(curs);
}
/* Set up curs and lock DB. */
static krb5_error_code
curs_init(iter_curs *curs, krb5_context ctx, krb5_db2_context *dbc,
krb5_flags iterflags)
{
curs->keycopy.size = 0;
curs->keycopy.data = NULL;
curs->islocked = FALSE;
curs->ctx = ctx;
curs->dbc = dbc;
if (iterflags & KRB5_DB_ITER_WRITE)
curs->lockmode = KRB5_LOCKMODE_EXCLUSIVE;
else
curs->lockmode = KRB5_LOCKMODE_SHARED;
if (iterflags & KRB5_DB_ITER_REV) {
curs->startflag = R_LAST;
curs->stepflag = R_PREV;
} else {
curs->startflag = R_FIRST;
curs->stepflag = R_NEXT;
}
return curs_lock(curs);
}
