#include <openssl/lhash.h>
#include "eng_int.h"
-/* This is the type of item in the 'implementation' table. Each 'nid' hashes to
- * a (potentially NULL) ENGINE_PILE structure which contains a stack of ENGINE*
- * pointers. These pointers aren't references, because they're inserted and
- * removed during ENGINE creation and ENGINE destruction. They point to ENGINEs
- * that *exist* (ie. have a structural reference count greater than zero) rather
- * than ENGINEs that are *functional*. Each pointer in those stacks are to
- * ENGINEs that implements the algorithm corresponding to each 'nid'. */
-
/* The type of the items in the table */
typedef struct st_engine_pile
{
- /* The 'nid' of the algorithm/mode this ENGINE_PILE structure represents
- * */
+ /* The 'nid' of this algorithm/mode */
int nid;
- /* A stack of ENGINE pointers for ENGINEs that support this
- * algorithm/mode. In the event that 'funct' is NULL, the first entry in
- * this stack that initialises will be set as 'funct' and assumed as the
- * default for operations of this type. */
+ /* ENGINEs that implement this algorithm/mode. */
STACK_OF(ENGINE) *sk;
/* The default ENGINE to perform this algorithm/mode. */
ENGINE *funct;
- /* This value optimises engine_table_select(). If it is called it sets
- * this value to 1. Any changes to this ENGINE_PILE resets it to zero.
- * As such, no ENGINE_init() thrashing is done unless ENGINEs
- * continually register (and/or unregister). */
+ /* Zero if 'sk' is newer than the cached 'funct', non-zero otherwise */
int uptodate;
} ENGINE_PILE;
-/* The type of the hash table of ENGINE_PILE structures such that each are
- * unique and keyed by the 'nid' value. */
+/* The type exposed in eng_int.h */
struct st_engine_table
{
LHASH piles;
}; /* ENGINE_TABLE */
-/* This value stores global options controlling behaviour of (mostly) the
- * engine_table_select() function. It's a bitmask of flag values of the form
- * ENGINE_TABLE_FLAG_*** (as defined in engine.h) and is controlled by the
- * ENGINE_[get|set]_table_flags() function. */
+/* Global flags (ENGINE_TABLE_FLAG_***). */
static unsigned int table_flags = 0;
/* API function manipulating 'table_flags' */
static int int_table_check(ENGINE_TABLE **t, int create)
{
LHASH *lh;
- if(*t)
- return 1;
- if(!create)
- return 0;
+ if(*t) return 1;
+ if(!create) return 0;
if((lh = lh_new(LHASH_HASH_FN(engine_pile_hash),
LHASH_COMP_FN(engine_pile_cmp))) == NULL)
return 0;
if(!fnd)
{
fnd = OPENSSL_malloc(sizeof(ENGINE_PILE));
- if(!fnd)
- goto end;
- fnd->uptodate = 1;
+ if(!fnd) goto end;
+ fnd->uptodate = 0;
fnd->nid = *nids;
fnd->sk = sk_ENGINE_new_null();
if(!fnd->sk)
OPENSSL_free(fnd);
goto end;
}
- fnd->funct= NULL;
+ fnd->funct = NULL;
lh_insert(&(*table)->piles, fnd);
}
/* A registration shouldn't add duplciate entries */
if(!sk_ENGINE_push(fnd->sk, e))
goto end;
/* "touch" this ENGINE_PILE */
- fnd->uptodate = 0;
+ fnd->uptodate = 1;
if(setdefault)
{
if(!engine_unlocked_init(e))
{
sk_ENGINE_delete(pile->sk, n);
/* "touch" this ENGINE_CIPHER */
- pile->uptodate = 0;
+ pile->uptodate = 1;
}
if(pile->funct == e)
{
CRYPTO_w_unlock(CRYPTO_LOCK_ENGINE);
}
-/* Exposed API function to get a functional reference from the implementation
- * table (ie. try to get a functional reference from the tabled structural
- * references) for a given cipher 'nid' */
+/* return a functional reference for a given 'nid' */
#ifndef ENGINE_TABLE_DEBUG
ENGINE *engine_table_select(ENGINE_TABLE **table, int nid)
#else
ENGINE_PILE tmplate, *fnd=NULL;
int initres, loop = 0;
- /* If 'engine_ciphers' is NULL, then it's absolutely *sure* that no
- * ENGINEs have registered any implementations! */
if(!(*table))
{
#ifdef ENGINE_TABLE_DEBUG
- fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, no "
- "registered for anything!\n", f, l, nid);
+ fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, nothing "
+ "registered!\n", f, l, nid);
#endif
return NULL;
}
CRYPTO_w_lock(CRYPTO_LOCK_ENGINE);
/* Check again inside the lock otherwise we could race against cleanup
* operations. But don't worry about a fprintf(stderr). */
- if(!int_table_check(table, 0))
- goto end;
+ if(!int_table_check(table, 0)) goto end;
tmplate.nid = nid;
fnd = lh_retrieve(&(*table)->piles, &tmplate);
- if(!fnd)
- goto end;
+ if(!fnd) goto end;
if(fnd->funct && engine_unlocked_init(fnd->funct))
{
#ifdef ENGINE_TABLE_DEBUG
#endif
goto end;
}
-#if 0
- /* Don't need to get a reference if we hold the lock. If the locking has
- * to change in future, that would be different ... */
- ret->struct_ref++; engine_ref_debug(ret, 0, 1)
-#endif
- /* Try and initialise the ENGINE if it's already functional *or* if the
- * ENGINE_TABLE_FLAG_NOINIT flag is not set. */
+ /* Try to initialise the ENGINE? */
if((ret->funct_ref > 0) || !(table_flags & ENGINE_TABLE_FLAG_NOINIT))
initres = engine_unlocked_init(ret);
else
initres = 0;
-#if 0
- /* Release the structural reference */
- ret->struct_ref--; engine_ref_debug(ret, 0, -1);
-#endif
if(initres)
{
- /* If we didn't have a default (functional reference) for this
- * 'nid' (or we had one but for whatever reason we're now
- * initialising a different one), use this opportunity to set
- * 'funct'. */
+ /* Update 'funct' */
if((fnd->funct != ret) && engine_unlocked_init(ret))
{
/* If there was a previous default we release it. */
if(fnd->funct)
engine_unlocked_finish(fnd->funct, 0);
- /* We got an extra functional reference for the
- * per-'nid' default */
fnd->funct = ret;
#ifdef ENGINE_TABLE_DEBUG
fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, "
}
goto trynext;
end:
- /* Whatever happened - we should "untouch" our uptodate file seeing as
- * we have tried our best to find a functional reference for 'nid'. If
- * it failed, it is unlikely to succeed again until some future
- * registrations (or unregistrations) have taken place that affect that
- * 'nid'. */
- if(fnd)
- fnd->uptodate = 1;
+ /* If it failed, it is unlikely to succeed again until some future
+ * registrations have taken place. In all cases, we cache. */
+ if(fnd) fnd->uptodate = 1;
#ifdef ENGINE_TABLE_DEBUG
if(ret)
fprintf(stderr, "engine_table_dbg: %s:%d, nid=%d, caching "
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