int yr_atoms_extract_from_re(
YR_ATOMS_CONFIG* config,
RE_AST* re_ast,
int flags,
YR_ATOM_LIST_ITEM** atoms,
int* min_atom_quality)
{
YR_ATOM_TREE* atom_tree = (YR_ATOM_TREE*) yr_malloc(sizeof(YR_ATOM_TREE));
YR_ATOM_LIST_ITEM* wide_atoms;
YR_ATOM_LIST_ITEM* case_insensitive_atoms;
if (atom_tree == NULL)
return ERROR_INSUFFICIENT_MEMORY;
atom_tree->root_node = _yr_atoms_tree_node_create(ATOM_TREE_OR);
if (atom_tree->root_node == NULL)
{
_yr_atoms_tree_destroy(atom_tree);
return ERROR_INSUFFICIENT_MEMORY;
}
FAIL_ON_ERROR_WITH_CLEANUP(
_yr_atoms_extract_from_re(config, re_ast, atom_tree->root_node),
_yr_atoms_tree_destroy(atom_tree));
// Initialize atom list
*atoms = NULL;
// Choose the atoms that will be used.
FAIL_ON_ERROR_WITH_CLEANUP(
_yr_atoms_choose(config, atom_tree->root_node, atoms, min_atom_quality),
_yr_atoms_tree_destroy(atom_tree));
_yr_atoms_tree_destroy(atom_tree);
FAIL_ON_ERROR_WITH_CLEANUP(
_yr_atoms_expand_wildcards(*atoms),
{
yr_atoms_list_destroy(*atoms);
*atoms = NULL;
});
int yr_atoms_extract_from_re(
RE_AST* re_ast,
int flags,
YR_ATOM_LIST_ITEM** atoms)
{
ATOM_TREE* atom_tree = (ATOM_TREE*) yr_malloc(sizeof(ATOM_TREE));
ATOM_TREE_NODE* temp;
YR_ATOM_LIST_ITEM* wide_atoms;
YR_ATOM_LIST_ITEM* case_insensitive_atoms;
YR_ATOM_LIST_ITEM* triplet_atoms;
int min_atom_quality = YR_MIN_ATOM_QUALITY;
if (atom_tree == NULL)
return ERROR_INSUFFICIENT_MEMORY;
atom_tree->root_node = _yr_atoms_tree_node_create(ATOM_TREE_OR);
if (atom_tree->root_node == NULL)
{
_yr_atoms_tree_destroy(atom_tree);
return ERROR_INSUFFICIENT_MEMORY;
}
atom_tree->current_leaf = NULL;
atom_tree->root_node = _yr_atoms_extract_from_re_node(
re_ast->root_node, atom_tree, atom_tree->root_node);
if (atom_tree->root_node == NULL)
{
_yr_atoms_tree_destroy(atom_tree);
return ERROR_INSUFFICIENT_MEMORY;
}
if (atom_tree->current_leaf != NULL)
_yr_atoms_tree_node_append(atom_tree->root_node, atom_tree->current_leaf);
if (atom_tree->root_node->children_head ==
atom_tree->root_node->children_tail)
{
// The root OR node has a single child, there's no need for the OR node so
// we proceed to destroy it and use its child as root.
temp = atom_tree->root_node;
atom_tree->root_node = atom_tree->root_node->children_head;
yr_free(temp);
}
// Initialize atom list
*atoms = NULL;
if (atom_tree->root_node != NULL)
{
// Choose the atoms that will be used.
FAIL_ON_ERROR_WITH_CLEANUP(
_yr_atoms_choose(atom_tree->root_node, atoms, &min_atom_quality),
_yr_atoms_tree_destroy(atom_tree));
}
_yr_atoms_tree_destroy(atom_tree);
if (min_atom_quality <= 2)
{
// Chosen atoms contain low quality ones, let's try infering some higher
// quality atoms.
FAIL_ON_ERROR_WITH_CLEANUP(
yr_atoms_extract_triplets(re_ast->root_node, &triplet_atoms),
{
yr_atoms_list_destroy(*atoms);
yr_atoms_list_destroy(triplet_atoms);
*atoms = NULL;
});
int yr_atoms_extract_from_re(
RE* re,
int flags,
YR_ATOM_LIST_ITEM** atoms)
{
ATOM_TREE* atom_tree = yr_malloc(sizeof(ATOM_TREE));
ATOM_TREE_NODE* temp;
YR_ATOM_LIST_ITEM* wide_atoms;
YR_ATOM_LIST_ITEM* case_insentive_atoms;
YR_ATOM_LIST_ITEM* triplet_atoms;
int min_atom_quality = 0;
atom_tree->root_node = _yr_atoms_tree_node_create(ATOM_TREE_OR);;
atom_tree->current_leaf = NULL;
atom_tree->root_node = _yr_atoms_extract_from_re_node(
re->root_node, atom_tree, atom_tree->root_node);
if (atom_tree->current_leaf != NULL)
_yr_atoms_tree_node_append(atom_tree->root_node, atom_tree->current_leaf);
if (atom_tree->root_node->children_head ==
atom_tree->root_node->children_tail)
{
// The root OR node has a single child, there's no need for the OR node so
// we proceed to destroy it and use its child as root.
temp = atom_tree->root_node;
atom_tree->root_node = atom_tree->root_node->children_head;
yr_free(temp);
}
// Choose the atoms that will be used.
min_atom_quality = _yr_atoms_choose(atom_tree->root_node, atoms);
_yr_atoms_tree_destroy(atom_tree);
if (min_atom_quality <= 2)
{
// Choosen atoms contain low quality ones, let's try infering some higher
// quality atoms.
yr_atoms_extract_triplets(re->root_node, &triplet_atoms);
if (min_atom_quality < _yr_atoms_min_quality(triplet_atoms))
{
yr_atoms_list_destroy(*atoms);
*atoms = triplet_atoms;
}
else
{
yr_atoms_list_destroy(triplet_atoms);
}
}
if (flags & STRING_GFLAGS_WIDE)
{
FAIL_ON_ERROR(_yr_atoms_wide(
*atoms, &wide_atoms));
if (flags & STRING_GFLAGS_ASCII)
{
*atoms = _yr_atoms_list_concat(*atoms, wide_atoms);
}
else
{
yr_atoms_list_destroy(*atoms);
*atoms = wide_atoms;
}
}
if (flags & STRING_GFLAGS_NO_CASE)
{
FAIL_ON_ERROR(_yr_atoms_case_insentive(
*atoms, &case_insentive_atoms));
*atoms = _yr_atoms_list_concat(*atoms, case_insentive_atoms);
}
return ERROR_SUCCESS;
}
