--- /dev/null
+/*
+ * Copyright (c) 2008 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "hx_locl.h"
+
+struct hx_expr *
+_hx509_make_expr(enum hx_expr_op op, void *arg1, void *arg2)
+{
+ struct hx_expr *expr;
+
+ expr = malloc(sizeof(*expr));
+ if (expr == NULL)
+ return NULL;
+ expr->op = op;
+ expr->arg1 = arg1;
+ expr->arg2 = arg2;
+
+ return expr;
+}
+
+static const char *
+eval_word(hx509_context context, hx509_env env, struct hx_expr *word)
+{
+ switch (word->op) {
+ case expr_STRING:
+ return word->arg1;
+ case expr_VAR:
+ if (word->arg2 == NULL)
+ return hx509_env_find(context, env, word->arg1);
+
+ env = hx509_env_find_binding(context, env, word->arg1);
+ if (env == NULL)
+ return NULL;
+
+ return eval_word(context, env, word->arg2);
+ default:
+ return NULL;
+ }
+}
+
+static hx509_env
+find_variable(hx509_context context, hx509_env env, struct hx_expr *word)
+{
+ assert(word->op == expr_VAR);
+
+ if (word->arg2 == NULL)
+ return hx509_env_find_binding(context, env, word->arg1);
+
+ env = hx509_env_find_binding(context, env, word->arg1);
+ if (env == NULL)
+ return NULL;
+ return find_variable(context, env, word->arg2);
+}
+
+static int
+eval_comp(hx509_context context, hx509_env env, struct hx_expr *expr)
+{
+ switch (expr->op) {
+ case comp_NE:
+ case comp_EQ:
+ case comp_TAILEQ: {
+ const char *s1, *s2;
+ int ret;
+
+ s1 = eval_word(context, env, expr->arg1);
+ s2 = eval_word(context, env, expr->arg2);
+
+ if (s1 == NULL || s2 == NULL)
+ return FALSE;
+
+ if (expr->op == comp_TAILEQ) {
+ size_t len1 = strlen(s1);
+ size_t len2 = strlen(s2);
+
+ if (len1 < len2)
+ return 0;
+ ret = strcmp(s1 + (len1 - len2), s2) == 0;
+ } else {
+ ret = strcmp(s1, s2) == 0;
+ if (expr->op == comp_NE)
+ ret = !ret;
+ }
+ return ret;
+ }
+ case comp_IN: {
+ struct hx_expr *subexpr;
+ const char *w, *s1;
+
+ w = eval_word(context, env, expr->arg1);
+
+ subexpr = expr->arg2;
+
+ if (subexpr->op == expr_WORDS) {
+ while (subexpr) {
+ s1 = eval_word(context, env, subexpr->arg1);
+ if (strcmp(w, s1) == 0)
+ return TRUE;
+ subexpr = subexpr->arg2;
+ }
+ } else if (subexpr->op == expr_VAR) {
+ hx509_env subenv;
+
+ subenv = find_variable(context, env, subexpr);
+ if (subenv == NULL)
+ return FALSE;
+
+ while (subenv) {
+ if (subenv->type != env_string)
+ continue;
+ if (strcmp(w, subenv->name) == 0)
+ return TRUE;
+ if (strcmp(w, subenv->u.string) == 0)
+ return TRUE;
+ subenv = subenv->next;
+ }
+
+ } else
+ _hx509_abort("hx509 eval IN unknown op: %d", (int)subexpr->op);
+
+ return FALSE;
+ }
+ default:
+ _hx509_abort("hx509 eval expr with unknown op: %d", (int)expr->op);
+ }
+ return FALSE;
+}
+
+int
+_hx509_expr_eval(hx509_context context, hx509_env env, struct hx_expr *expr)
+{
+ switch (expr->op) {
+ case op_TRUE:
+ return 1;
+ case op_FALSE:
+ return 0;
+ case op_NOT:
+ return ! _hx509_expr_eval(context, env, expr->arg1);
+ case op_AND:
+ return _hx509_expr_eval(context, env, expr->arg1) &&
+ _hx509_expr_eval(context, env, expr->arg2);
+ case op_OR:
+ return _hx509_expr_eval(context, env, expr->arg1) ||
+ _hx509_expr_eval(context, env, expr->arg2);
+ case op_COMP:
+ return eval_comp(context, env, expr->arg1);
+ default:
+ _hx509_abort("hx509 eval expr with unknown op: %d", (int)expr->op);
+ }
+}
+
+void
+_hx509_expr_free(struct hx_expr *expr)
+{
+ switch (expr->op) {
+ case expr_STRING:
+ case expr_NUMBER:
+ free(expr->arg1);
+ break;
+ case expr_WORDS:
+ case expr_FUNCTION:
+ case expr_VAR:
+ free(expr->arg1);
+ if (expr->arg2)
+ _hx509_expr_free(expr->arg2);
+ break;
+ default:
+ if (expr->arg1)
+ _hx509_expr_free(expr->arg1);
+ if (expr->arg2)
+ _hx509_expr_free(expr->arg2);
+ break;
+ }
+ free(expr);
+}
+
+struct hx_expr *
+_hx509_expr_parse(const char *buf)
+{
+ _hx509_expr_input.buf = buf;
+ _hx509_expr_input.length = strlen(buf);
+ _hx509_expr_input.offset = 0;
+ _hx509_expr_input.expr = NULL;
+
+ if (_hx509_expr_input.error) {
+ free(_hx509_expr_input.error);
+ _hx509_expr_input.error = NULL;
+ }
+
+ yyparse();
+
+ return _hx509_expr_input.expr;
+}
+
+void
+_hx509_sel_yyerror (char *s)
+{
+ if (_hx509_expr_input.error)
+ free(_hx509_expr_input.error);
+
+ _hx509_expr_input.error = strdup(s);
+}
+
git.samba.org / sfrench / samba-autobuild / .git / blobdiff