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make temporary RDN and AVA arrays rescalable if needed

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This commit is contained in:
Pierangelo Masarati 2002-01-14 19:44:04 +00:00
parent 9d6ebd822e
commit 36f6a1169a
1 changed files with 73 additions and 17 deletions
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90
libraries/libldap/getdn.c
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@ -589,7 +589,14 @@ ldap_dnfree( LDAPDN *dn )
* and readable as soon as it works as expected.
*/
#define TMP_SLOTS 1024
/*
* Default sizes of AVA and RDN static working arrays; if required
* the are dynamically resized. The values can be tuned in case
* of special requirements (e.g. very deep DN trees or high number
* of AVAs per RDN).
*/
#define TMP_AVA_SLOTS 8
#define TMP_RDN_SLOTS 32
int
ldap_str2dn( LDAP_CONST char *str, LDAPDN **dn, unsigned flags )
@ -599,7 +606,8 @@ ldap_str2dn( LDAP_CONST char *str, LDAPDN **dn, unsigned flags )
int nrdns = 0;
LDAPDN *newDN = NULL;
LDAPRDN *newRDN = NULL, *tmpDN[TMP_SLOTS];
LDAPRDN *newRDN = NULL, *tmpDN_[TMP_RDN_SLOTS], **tmpDN = tmpDN_;
int num_slots = TMP_RDN_SLOTS;
assert( str );
assert( dn );
@ -692,20 +700,31 @@ ldap_str2dn( LDAP_CONST char *str, LDAPDN **dn, unsigned flags )
tmpDN[nrdns++] = newRDN;
newRDN = NULL;
#if 0
/*
* prone to attacks?
* make the static RDN array dynamically rescalable
*/
assert (nrdns < TMP_SLOTS);
#else
/*
* make the static AVA array dynamically rescalable
*/
if (nrdns >= TMP_SLOTS) {
rc = LDAP_DECODING_ERROR;
goto parsing_error;
if ( nrdns == num_slots ) {
LDAPRDN **tmp;
if ( tmpDN == tmpDN_ ) {
tmp = LDAP_MALLOC( num_slots * 2 * sizeof( LDAPRDN * ) );
if ( tmp == NULL ) {
rc = LDAP_NO_MEMORY;
goto parsing_error;
}
AC_MEMCPY( tmp, tmpDN, num_slots * sizeof( LDAPRDN * ) );
} else {
tmp = LDAP_REALLOC( tmpDN, num_slots * 2 * sizeof( LDAPRDN * ) );
if ( tmp == NULL ) {
rc = LDAP_NO_MEMORY;
goto parsing_error;
}
}
tmpDN = tmp;
num_slots *= 2;
}
#endif
if ( p[ 0 ] == '\0' ) {
/*
@ -741,10 +760,16 @@ parsing_error:;
ldap_rdnfree( newRDN );
}
for (nrdns-- ;nrdns>=0; nrdns-- )
for ( nrdns-- ;nrdns >= 0; nrdns-- ) {
ldap_rdnfree( tmpDN[nrdns] );
}
return_result:;
if ( tmpDN != tmpDN_ ) {
LDAP_FREE( tmpDN );
}
Debug( LDAP_DEBUG_TRACE, "<= ldap_str2dn(%s,%u)=%d\n", str, flags, rc );
*dn = newDN;
@ -775,7 +800,8 @@ ldap_str2rdn( LDAP_CONST char *str, LDAPRDN **rdn,
struct berval attrValue = { 0, NULL };
LDAPRDN *newRDN = NULL;
LDAPAVA *tmpRDN[TMP_SLOTS];
LDAPAVA *tmpRDN_[TMP_AVA_SLOTS], **tmpRDN = tmpRDN_;
int num_slots = TMP_AVA_SLOTS;
assert( str );
assert( rdn || flags & LDAP_DN_SKIP );
@ -1134,7 +1160,31 @@ ldap_str2rdn( LDAP_CONST char *str, LDAPRDN **rdn,
attrValue.bv_val = NULL;
attrValue.bv_len = 0;
assert(navas < TMP_SLOTS);
/*
* prepare room for new AVAs if needed
*/
if (navas == num_slots) {
LDAPAVA **tmp;
if ( tmpRDN == tmpRDN_ ) {
tmp = LDAP_MALLOC( num_slots * 2 * sizeof( LDAPAVA * ) );
if ( tmp == NULL ) {
rc = LDAP_NO_MEMORY;
goto parsing_error;
}
AC_MEMCPY( tmp, tmpRDN, num_slots * sizeof( LDAPAVA * ) );
} else {
tmp = LDAP_REALLOC( tmpRDN, num_slots * 2 * sizeof( LDAPAVA * ) );
if ( tmp == NULL ) {
rc = LDAP_NO_MEMORY;
goto parsing_error;
}
}
tmpRDN = tmp;
num_slots *= 2;
}
}
/*
@ -1207,13 +1257,19 @@ parsing_error:;
free( attrValue.bv_val );
}
for (navas-- ; navas>=0; navas-- )
for ( navas-- ; navas >= 0; navas-- ) {
ldap_avafree( tmpRDN[navas] );
}
return_result:;
if ( tmpRDN != tmpRDN_ ) {
LDAP_FREE( tmpRDN );
}
Debug( LDAP_DEBUG_TRACE, "<= ldap_str2rdn(%*s)=%d\n",
p - str, str, rc );
if ( rdn ) {
*rdn = newRDN;
}