X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Ffilter%2Ffilter-visitor-ir-validate-string.c;fp=src%2Fcommon%2Ffilter%2Ffilter-visitor-ir-validate-string.c;h=1df83b03fb3711466378da2492ec0169c67190b5;hp=0000000000000000000000000000000000000000;hb=1831ae68b70dece8e9b847081526495adbbf05e5;hpb=25357057de5ae4dd2a572e8f9b893c1b90cbd60a

diff --git a/src/common/filter/filter-visitor-ir-validate-string.c b/src/common/filter/filter-visitor-ir-validate-string.c
new file mode 100644
index 000000000..1df83b03f
--- /dev/null
+++ b/src/common/filter/filter-visitor-ir-validate-string.c
@@ -0,0 +1,124 @@
+/*
+ * filter-visitor-ir-validate-string.c
+ *
+ * LTTng filter IR validate string
+ *
+ * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+
+#include <common/macros.h>
+
+#include "filter-ast.h"
+#include "filter-parser.h"
+#include "filter-ir.h"
+
+enum parse_char_result {
+	PARSE_CHAR_UNKNOWN = -2,
+	PARSE_CHAR_WILDCARD = -1,
+	PARSE_CHAR_NORMAL = 0,
+};
+
+static
+enum parse_char_result parse_char(const char **p)
+{
+	switch (**p) {
+	case '\\':
+		(*p)++;
+		switch (**p) {
+		case '\\':
+		case '*':
+			return PARSE_CHAR_NORMAL;
+		default:
+			return PARSE_CHAR_UNKNOWN;
+		}
+	case '*':
+		return PARSE_CHAR_WILDCARD;
+	default:
+		return PARSE_CHAR_NORMAL;
+	}
+}
+
+static
+int validate_string(struct ir_op *node)
+{
+	switch (node->op) {
+	case IR_OP_UNKNOWN:
+	default:
+		fprintf(stderr, "[error] %s: unknown op type\n", __func__);
+		return -EINVAL;
+
+	case IR_OP_ROOT:
+		return validate_string(node->u.root.child);
+	case IR_OP_LOAD:
+	{
+		int ret = 0;
+
+		if (node->data_type == IR_DATA_STRING) {
+			const char *str;
+
+			assert(node->u.load.u.string.value);
+			str = node->u.load.u.string.value;
+
+			for (;;) {
+				enum parse_char_result res;
+
+				if (!(*str)) {
+					break;
+				}
+
+				res = parse_char(&str);
+				str++;
+
+				switch (res) {
+				case PARSE_CHAR_UNKNOWN:
+					ret = -EINVAL;
+					fprintf(stderr,
+						"Unsupported escape character detected.\n");
+					goto end_load;
+				case PARSE_CHAR_NORMAL:
+				default:
+					break;
+				}
+			}
+		}
+end_load:
+		return ret;
+	}
+	case IR_OP_UNARY:
+		return validate_string(node->u.unary.child);
+	case IR_OP_BINARY:
+	{
+		int ret = validate_string(node->u.binary.left);
+
+		if (ret)
+			return ret;
+		return validate_string(node->u.binary.right);
+	}
+	case IR_OP_LOGICAL:
+	{
+		int ret;
+
+		ret = validate_string(node->u.logical.left);
+		if (ret)
+			return ret;
+		return validate_string(node->u.logical.right);
+	}
+	}
+}
+
+LTTNG_HIDDEN
+int filter_visitor_ir_validate_string(struct filter_parser_ctx *ctx)
+{
+	return validate_string(ctx->ir_root);
+}