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/** BEGIN COPYRIGHT BLOCK
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
/* Handles computed attributes for entries as they're returned to the client */
#include "slap.h"
/* Structure used to pass the context needed for completing a computed attribute operation */
struct _computed_attr_context {
BerElement *ber;
int attrsonly;
char *requested_type;
Slapi_PBlock *pb;
};
struct _compute_evaluator {
struct _compute_evaluator *next;
slapi_compute_callback_t function;
};
typedef struct _compute_evaluator compute_evaluator;
static compute_evaluator *compute_evaluators = NULL;
static PRRWLock *compute_evaluators_lock = NULL;
static int
compute_stock_evaluator(computed_attr_context *c,char* type,Slapi_Entry *e,slapi_compute_output_t outputfn);
struct _compute_rewriter {
struct _compute_rewriter *next;
slapi_search_rewrite_callback_t function;
};
typedef struct _compute_rewriter compute_rewriter;
static compute_rewriter *compute_rewriters = NULL;
static PRRWLock *compute_rewriters_lock = NULL;
/* Function called by evaluators to have the value output */
static int
compute_output_callback(computed_attr_context *c,Slapi_Attr *a , Slapi_Entry *e)
{
return encode_attr (c->pb, c->ber, e, a, c->attrsonly, c->requested_type);
}
static int
compute_call_evaluators(computed_attr_context *c,slapi_compute_output_t outfn,char *type,Slapi_Entry *e)
{
int rc = -1;
compute_evaluator *current = NULL;
/* Walk along the list (locked) calling the evaluator functions util one says yes, an error happens, or we finish */
PR_RWLock_Rlock(compute_evaluators_lock);
for (current = compute_evaluators; (current != NULL) && (-1 == rc); current = current->next) {
rc = (*(current->function))(c,type,e,outfn);
}
PR_RWLock_Unlock(compute_evaluators_lock);
return rc;
}
/* Returns : -1 if no attribute matched the requested type */
/* 0 if one matched and it was processed without error */
/* >0 if an error happened */
int
compute_attribute(char *type, Slapi_PBlock *pb,BerElement *ber,Slapi_Entry *e,int attrsonly,char *requested_type)
{
computed_attr_context context;
context.ber = ber;
context.attrsonly = attrsonly;
context.requested_type = requested_type;
context.pb = pb;
return compute_call_evaluators(&context,compute_output_callback,type,e);
}
static int
compute_stock_evaluator(computed_attr_context *c,char* type,Slapi_Entry *e,slapi_compute_output_t outputfn)
{
int rc= -1;
static char* subschemasubentry = "subschemasubentry";
if ( strcasecmp (type, subschemasubentry ) == 0)
{
Slapi_Attr our_attr;
slapi_attr_init(&our_attr, subschemasubentry);
our_attr.a_flags = SLAPI_ATTR_FLAG_OPATTR;
valueset_add_string(&our_attr.a_present_values,SLAPD_SCHEMA_DN,CSN_TYPE_UNKNOWN,NULL);
rc = (*outputfn) (c, &our_attr, e);
attr_done(&our_attr);
return (rc);
}
return rc; /* I see no ships */
}
int slapi_compute_add_evaluator(slapi_compute_callback_t function)
{
int rc = 0;
compute_evaluator *new_eval = NULL;
PR_ASSERT(NULL != function);
PR_ASSERT(NULL != compute_evaluators_lock);
PR_RWLock_Wlock(compute_evaluators_lock);
new_eval = calloc(1,sizeof (compute_evaluator));
if (NULL == new_eval) {
rc = ENOMEM;
} else {
new_eval->next = compute_evaluators;
new_eval->function = function;
compute_evaluators = new_eval;
}
PR_RWLock_Unlock(compute_evaluators_lock);
return rc;
}
/* Call this on server startup, before the first LDAP operation is serviced */
int compute_init()
{
/* Initialize the lock */
compute_evaluators_lock = PR_NewRWLock( PR_RWLOCK_RANK_NONE, "compute_attr_lock" );
if (NULL == compute_evaluators_lock) {
/* Out of resources */
return ENOMEM;
}
compute_rewriters_lock = PR_NewRWLock( PR_RWLOCK_RANK_NONE, "compute_rewriters_lock" );
if (NULL == compute_rewriters_lock) {
/* Out of resources */
return ENOMEM;
}
/* Now add the stock evaluators to the list */
return slapi_compute_add_evaluator(compute_stock_evaluator);
}
/* Call this on server shutdown, after the last LDAP operation has
terminated */
int compute_terminate()
{
/* Free the list */
if (NULL != compute_evaluators_lock) {
compute_evaluator *current = compute_evaluators;
PR_RWLock_Wlock(compute_evaluators_lock);
while (current != NULL) {
compute_evaluator *asabird = current;
current = current->next;
free(asabird);
}
PR_RWLock_Unlock(compute_evaluators_lock);
/* Free the lock */
PR_DestroyRWLock(compute_evaluators_lock);
}
if (NULL != compute_rewriters_lock) {
compute_rewriter *current = compute_rewriters;
PR_RWLock_Wlock(compute_rewriters_lock);
while (current != NULL) {
compute_rewriter *asabird = current;
current = current->next;
free(asabird);
}
PR_RWLock_Unlock(compute_rewriters_lock);
PR_DestroyRWLock(compute_rewriters_lock);
}
return 0;
}
/* Functions dealing with re-writing of search filters */
int slapi_compute_add_search_rewriter(slapi_search_rewrite_callback_t function)
{
int rc = 0;
compute_rewriter *new_rewriter = NULL;
PR_ASSERT(NULL != function);
PR_ASSERT(NULL != compute_rewriters_lock);
new_rewriter = calloc(1,sizeof (compute_rewriter));
if (NULL == new_rewriter) {
rc = ENOMEM;
} else {
PR_RWLock_Wlock(compute_rewriters_lock);
new_rewriter->next = compute_rewriters;
new_rewriter->function = function;
compute_rewriters = new_rewriter;
PR_RWLock_Unlock(compute_rewriters_lock);
}
return rc;
}
int compute_rewrite_search_filter(Slapi_PBlock *pb)
{
/* Iterate through the listed rewriters until one says it matched */
int rc = -1;
compute_rewriter *current = NULL;
/* Walk along the list (locked) calling the evaluator functions util one says yes, an error happens, or we finish */
PR_RWLock_Rlock(compute_rewriters_lock);
for (current = compute_rewriters; (current != NULL) && (-1 == rc); current = current->next) {
rc = (*(current->function))(pb);
/* Meaning of the return code :
-1 : keep looking
0 : rewrote OK
1 : refuse to do this search
2 : operations error
*/
}
PR_RWLock_Unlock(compute_rewriters_lock);
return rc;
}
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