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; }