/*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
-/*-
- * Code for dynamic hash table routines
- * Author - Eric Young v 2.0
- *
- * 2.2 eay - added #include "crypto.h" so the memory leak checking code is
- * present. eay 18-Jun-98
- *
- * 2.1 eay - Added an 'error in last operation' flag. eay 6-May-98
- *
- * 2.0 eay - Fixed a bug that occurred when using lh_delete
- * from inside lh_doall(). As entries were deleted,
- * the 'table' was 'contract()ed', making some entries
- * jump from the end of the table to the start, there by
- * skipping the lh_doall() processing. eay - 4/12/95
- *
- * 1.9 eay - Fixed a memory leak in lh_free, the LHASH_NODEs
- * were not being free()ed. 21/11/95
- *
- * 1.8 eay - Put the stats routines into a separate file, lh_stats.c
- * 19/09/95
- *
- * 1.7 eay - Removed the fputs() for realloc failures - the code
- * should silently tolerate them. I have also fixed things
- * lint complained about 04/05/95
- *
- * 1.6 eay - Fixed an invalid pointers in contract/expand 27/07/92
- *
- * 1.5 eay - Fixed a misuse of realloc in expand 02/03/1992
- *
- * 1.4 eay - Fixed lh_doall so the function can call lh_delete 28/05/91
- *
- * 1.3 eay - Fixed a few lint problems 19/3/1991
- *
- * 1.2 eay - Fixed lh_doall problem 13/3/1991
- *
- * 1.1 eay - Added lh_doall
- *
- * 1.0 eay - First version
- */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <openssl/crypto.h>
#include <openssl/lhash.h>
+#include <openssl/err.h>
+#include "crypto/ctype.h"
+#include "crypto/lhash.h"
+#include "lhash_local.h"
+
+/*
+ * A hashing implementation that appears to be based on the linear hashing
+ * algorithm:
+ * https://en.wikipedia.org/wiki/Linear_hashing
+ *
+ * Litwin, Witold (1980), "Linear hashing: A new tool for file and table
+ * addressing", Proc. 6th Conference on Very Large Databases: 212-223
+ * https://hackthology.com/pdfs/Litwin-1980-Linear_Hashing.pdf
+ *
+ * From the Wikipedia article "Linear hashing is used in the BDB Berkeley
+ * database system, which in turn is used by many software systems such as
+ * OpenLDAP, using a C implementation derived from the CACM article and first
+ * published on the Usenet in 1988 by Esmond Pitt."
+ *
+ * The CACM paper is available here:
+ * https://pdfs.semanticscholar.org/ff4d/1c5deca6269cc316bfd952172284dbf610ee.pdf
+ */
#undef MIN_NODES
#define MIN_NODES 16
#define UP_LOAD (2*LH_LOAD_MULT) /* load times 256 (default 2) */
#define DOWN_LOAD (LH_LOAD_MULT) /* load times 256 (default 1) */
-static void expand(_LHASH *lh);
-static void contract(_LHASH *lh);
-static LHASH_NODE **getrn(_LHASH *lh, const void *data, unsigned long *rhash);
+static int expand(OPENSSL_LHASH *lh);
+static void contract(OPENSSL_LHASH *lh);
+static OPENSSL_LH_NODE **getrn(OPENSSL_LHASH *lh, const void *data, unsigned long *rhash);
-_LHASH *lh_new(LHASH_HASH_FN_TYPE h, LHASH_COMP_FN_TYPE c)
+OPENSSL_LHASH *OPENSSL_LH_new(OPENSSL_LH_HASHFUNC h, OPENSSL_LH_COMPFUNC c)
{
- _LHASH *ret;
-
- if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
- goto err0;
+ OPENSSL_LHASH *ret;
+
+ if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
+ /*
+ * Do not set the error code, because the ERR code uses LHASH
+ * and we want to avoid possible endless error loop.
+ * ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
+ */
+ return NULL;
+ }
if ((ret->b = OPENSSL_zalloc(sizeof(*ret->b) * MIN_NODES)) == NULL)
- goto err1;
- ret->comp = ((c == NULL) ? (LHASH_COMP_FN_TYPE)strcmp : c);
- ret->hash = ((h == NULL) ? (LHASH_HASH_FN_TYPE)lh_strhash : h);
+ goto err;
+ ret->comp = ((c == NULL) ? (OPENSSL_LH_COMPFUNC)strcmp : c);
+ ret->hash = ((h == NULL) ? (OPENSSL_LH_HASHFUNC)OPENSSL_LH_strhash : h);
ret->num_nodes = MIN_NODES / 2;
ret->num_alloc_nodes = MIN_NODES;
ret->pmax = MIN_NODES / 2;
ret->up_load = UP_LOAD;
ret->down_load = DOWN_LOAD;
- return (ret);
+ return ret;
- err1:
+err:
+ OPENSSL_free(ret->b);
OPENSSL_free(ret);
- err0:
- return (NULL);
+ return NULL;
+}
+
+void OPENSSL_LH_free(OPENSSL_LHASH *lh)
+{
+ if (lh == NULL)
+ return;
+
+ OPENSSL_LH_flush(lh);
+ OPENSSL_free(lh->b);
+ OPENSSL_free(lh);
}
-void lh_free(_LHASH *lh)
+void OPENSSL_LH_flush(OPENSSL_LHASH *lh)
{
unsigned int i;
- LHASH_NODE *n, *nn;
+ OPENSSL_LH_NODE *n, *nn;
if (lh == NULL)
return;
OPENSSL_free(n);
n = nn;
}
+ lh->b[i] = NULL;
}
- OPENSSL_free(lh->b);
- OPENSSL_free(lh);
}
-void *lh_insert(_LHASH *lh, void *data)
+void *OPENSSL_LH_insert(OPENSSL_LHASH *lh, void *data)
{
unsigned long hash;
- LHASH_NODE *nn, **rn;
+ OPENSSL_LH_NODE *nn, **rn;
void *ret;
lh->error = 0;
- if (lh->up_load <= (lh->num_items * LH_LOAD_MULT / lh->num_nodes))
- expand(lh);
+ if ((lh->up_load <= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)) && !expand(lh))
+ return NULL; /* 'lh->error++' already done in 'expand' */
rn = getrn(lh, data, &hash);
if (*rn == NULL) {
if ((nn = OPENSSL_malloc(sizeof(*nn))) == NULL) {
lh->error++;
- return (NULL);
+ return NULL;
}
nn->data = data;
nn->next = NULL;
lh->num_insert++;
lh->num_items++;
} else { /* replace same key */
-
ret = (*rn)->data;
(*rn)->data = data;
lh->num_replace++;
}
- return (ret);
+ return ret;
}
-void *lh_delete(_LHASH *lh, const void *data)
+void *OPENSSL_LH_delete(OPENSSL_LHASH *lh, const void *data)
{
unsigned long hash;
- LHASH_NODE *nn, **rn;
+ OPENSSL_LH_NODE *nn, **rn;
void *ret;
lh->error = 0;
if (*rn == NULL) {
lh->num_no_delete++;
- return (NULL);
+ return NULL;
} else {
nn = *rn;
*rn = nn->next;
(lh->down_load >= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)))
contract(lh);
- return (ret);
+ return ret;
}
-void *lh_retrieve(_LHASH *lh, const void *data)
+void *OPENSSL_LH_retrieve(OPENSSL_LHASH *lh, const void *data)
{
unsigned long hash;
- LHASH_NODE **rn;
+ OPENSSL_LH_NODE **rn;
void *ret;
- lh->error = 0;
+ tsan_store((TSAN_QUALIFIER int *)&lh->error, 0);
+
rn = getrn(lh, data, &hash);
if (*rn == NULL) {
- lh->num_retrieve_miss++;
- return (NULL);
+ tsan_counter(&lh->num_retrieve_miss);
+ return NULL;
} else {
ret = (*rn)->data;
- lh->num_retrieve++;
+ tsan_counter(&lh->num_retrieve);
}
- return (ret);
+
+ return ret;
}
-static void doall_util_fn(_LHASH *lh, int use_arg, LHASH_DOALL_FN_TYPE func,
- LHASH_DOALL_ARG_FN_TYPE func_arg, void *arg)
+static void doall_util_fn(OPENSSL_LHASH *lh, int use_arg,
+ OPENSSL_LH_DOALL_FUNC func,
+ OPENSSL_LH_DOALL_FUNCARG func_arg, void *arg)
{
int i;
- LHASH_NODE *a, *n;
+ OPENSSL_LH_NODE *a, *n;
if (lh == NULL)
return;
for (i = lh->num_nodes - 1; i >= 0; i--) {
a = lh->b[i];
while (a != NULL) {
- /*
- * 28/05/91 - eay - n added so items can be deleted via lh_doall
- */
- /*
- * 22/05/08 - ben - eh? since a is not passed, this should not be
- * needed
- */
n = a->next;
if (use_arg)
func_arg(a->data, arg);
}
}
-void lh_doall(_LHASH *lh, LHASH_DOALL_FN_TYPE func)
+void OPENSSL_LH_doall(OPENSSL_LHASH *lh, OPENSSL_LH_DOALL_FUNC func)
{
- doall_util_fn(lh, 0, func, (LHASH_DOALL_ARG_FN_TYPE)0, NULL);
+ doall_util_fn(lh, 0, func, (OPENSSL_LH_DOALL_FUNCARG)0, NULL);
}
-void lh_doall_arg(_LHASH *lh, LHASH_DOALL_ARG_FN_TYPE func, void *arg)
+void OPENSSL_LH_doall_arg(OPENSSL_LHASH *lh, OPENSSL_LH_DOALL_FUNCARG func, void *arg)
{
- doall_util_fn(lh, 1, (LHASH_DOALL_FN_TYPE)0, func, arg);
+ doall_util_fn(lh, 1, (OPENSSL_LH_DOALL_FUNC)0, func, arg);
}
-static void expand(_LHASH *lh)
+static int expand(OPENSSL_LHASH *lh)
{
- LHASH_NODE **n, **n1, **n2, *np;
- unsigned int p, i, j;
- unsigned long hash, nni;
+ OPENSSL_LH_NODE **n, **n1, **n2, *np;
+ unsigned int p, pmax, nni, j;
+ unsigned long hash;
+
+ nni = lh->num_alloc_nodes;
+ p = lh->p;
+ pmax = lh->pmax;
+ if (p + 1 >= pmax) {
+ j = nni * 2;
+ n = OPENSSL_realloc(lh->b, sizeof(OPENSSL_LH_NODE *) * j);
+ if (n == NULL) {
+ lh->error++;
+ return 0;
+ }
+ lh->b = n;
+ memset(n + nni, 0, sizeof(*n) * (j - nni));
+ lh->pmax = nni;
+ lh->num_alloc_nodes = j;
+ lh->num_expand_reallocs++;
+ lh->p = 0;
+ } else {
+ lh->p++;
+ }
lh->num_nodes++;
lh->num_expands++;
- p = (int)lh->p++;
n1 = &(lh->b[p]);
- n2 = &(lh->b[p + (int)lh->pmax]);
- *n2 = NULL; /* 27/07/92 - eay - undefined pointer bug */
- nni = lh->num_alloc_nodes;
+ n2 = &(lh->b[p + pmax]);
+ *n2 = NULL;
for (np = *n1; np != NULL;) {
hash = np->hash;
np = *n1;
}
- if ((lh->p) >= lh->pmax) {
- j = (int)lh->num_alloc_nodes * 2;
- n = OPENSSL_realloc(lh->b, (int)(sizeof(LHASH_NODE *) * j));
- if (n == NULL) {
- /* fputs("realloc error in lhash",stderr); */
- lh->error++;
- lh->p = 0;
- return;
- }
- for (i = (int)lh->num_alloc_nodes; i < j; i++) /* 26/02/92 eay */
- n[i] = NULL; /* 02/03/92 eay */
- lh->pmax = lh->num_alloc_nodes;
- lh->num_alloc_nodes = j;
- lh->num_expand_reallocs++;
- lh->p = 0;
- lh->b = n;
- }
+ return 1;
}
-static void contract(_LHASH *lh)
+static void contract(OPENSSL_LHASH *lh)
{
- LHASH_NODE **n, *n1, *np;
+ OPENSSL_LH_NODE **n, *n1, *np;
np = lh->b[lh->p + lh->pmax - 1];
lh->b[lh->p + lh->pmax - 1] = NULL; /* 24/07-92 - eay - weird but :-( */
if (lh->p == 0) {
n = OPENSSL_realloc(lh->b,
- (unsigned int)(sizeof(LHASH_NODE *) * lh->pmax));
+ (unsigned int)(sizeof(OPENSSL_LH_NODE *) * lh->pmax));
if (n == NULL) {
/* fputs("realloc error in lhash",stderr); */
lh->error++;
}
}
-static LHASH_NODE **getrn(_LHASH *lh, const void *data, unsigned long *rhash)
+static OPENSSL_LH_NODE **getrn(OPENSSL_LHASH *lh,
+ const void *data, unsigned long *rhash)
{
- LHASH_NODE **ret, *n1;
+ OPENSSL_LH_NODE **ret, *n1;
unsigned long hash, nn;
- LHASH_COMP_FN_TYPE cf;
+ OPENSSL_LH_COMPFUNC cf;
hash = (*(lh->hash)) (data);
- lh->num_hash_calls++;
+ tsan_counter(&lh->num_hash_calls);
*rhash = hash;
nn = hash % lh->pmax;
cf = lh->comp;
ret = &(lh->b[(int)nn]);
for (n1 = *ret; n1 != NULL; n1 = n1->next) {
- lh->num_hash_comps++;
+ tsan_counter(&lh->num_hash_comps);
if (n1->hash != hash) {
ret = &(n1->next);
continue;
}
- lh->num_comp_calls++;
+ tsan_counter(&lh->num_comp_calls);
if (cf(n1->data, data) == 0)
break;
ret = &(n1->next);
}
- return (ret);
+ return ret;
}
/*
* collisions on /usr/dict/words and it distributes on %2^n quite well, not
* as good as MD5, but still good.
*/
-unsigned long lh_strhash(const char *c)
+unsigned long OPENSSL_LH_strhash(const char *c)
{
unsigned long ret = 0;
long n;
int r;
if ((c == NULL) || (*c == '\0'))
- return (ret);
-/*-
- unsigned char b[16];
- MD5(c,strlen(c),b);
- return(b[0]|(b[1]<<8)|(b[2]<<16)|(b[3]<<24));
-*/
+ return ret;
n = 0x100;
while (*c) {
ret ^= v * v;
c++;
}
- return ((ret >> 16) ^ ret);
+ return (ret >> 16) ^ ret;
+}
+
+unsigned long ossl_lh_strcasehash(const char *c)
+{
+ unsigned long ret = 0;
+ long n;
+ unsigned long v;
+ int r;
+
+ if (c == NULL || *c == '\0')
+ return ret;
+
+ for (n = 0x100; *c != '\0'; n += 0x100) {
+ v = n | ossl_tolower(*c);
+ r = (int)((v >> 2) ^ v) & 0x0f;
+ ret = (ret << r) | (ret >> (32 - r));
+ ret &= 0xFFFFFFFFL;
+ ret ^= v * v;
+ c++;
+ }
+ return (ret >> 16) ^ ret;
}
-unsigned long lh_num_items(const _LHASH *lh)
+unsigned long OPENSSL_LH_num_items(const OPENSSL_LHASH *lh)
{
return lh ? lh->num_items : 0;
}
-unsigned long lh_get_down_load(const _LHASH *lh)
+unsigned long OPENSSL_LH_get_down_load(const OPENSSL_LHASH *lh)
{
return lh->down_load;
}
-void lh_set_down_load(_LHASH *lh, unsigned long down_load)
+void OPENSSL_LH_set_down_load(OPENSSL_LHASH *lh, unsigned long down_load)
{
lh->down_load = down_load;
}
-int lh_error(_LHASH *lh)
+int OPENSSL_LH_error(OPENSSL_LHASH *lh)
{
return lh->error;
}