From eadddde8591e5ab6a8d8dff349affc53d1d4021b Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Tue, 29 Jan 2008 18:55:31 +0100
Subject: [PATCH] cleanup, move parse_tuple to libuci, add some input
 validation

---
 cli.c  | 37 ++--------------------------------
 file.c | 11 +++++-----
 uci.h  | 14 +++++++++++++
 util.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 84 insertions(+), 41 deletions(-)

diff --git a/cli.c b/cli.c
index 1fa1cb1..410d7e8 100644
--- a/cli.c
+++ b/cli.c
@@ -112,37 +112,6 @@ static int uci_do_export(int argc, char **argv)
 	return 0;
 }
 
-static void parse_tuple(char *str, char **package, char **section, char **option, char **value)
-{
-	char *last = NULL;
-
-	*package = strtok(str, ".");
-	if (!*package)
-		goto done;
-
-	last = *package;
-	*section = strtok(NULL, ".");
-	if (!*section)
-		goto done;
-
-	last = *section;
-	*option = strtok(NULL, ".");
-	if (!*option)
-		goto done;
-
-	last = *option;
-done:
-	if (!value)
-		return;
-
-	last = strtok(last, "=");
-	if (!last)
-		return;
-
-	*value = last + strlen(last) + 1;
-}
-
-
 static int uci_do_get(int argc, char **argv)
 {
 	char *package = NULL;
@@ -155,8 +124,7 @@ static int uci_do_get(int argc, char **argv)
 	if (argc != 2)
 		return 255;
 
-	parse_tuple(argv[1], &package, &section, &option, NULL);
-	if (!package)
+	if (uci_parse_tuple(ctx, argv[1], &package, &section, &option, NULL) != UCI_OK)
 		return 1;
 
 	if (uci_load(ctx, package, &p) != UCI_OK) {
@@ -196,8 +164,7 @@ static int uci_do_set(int argc, char **argv)
 	if (argc != 2)
 		return 255;
 
-	parse_tuple(argv[1], &package, &section, &option, &value);
-	if (!package)
+	if (uci_parse_tuple(ctx, argv[1], &package, &section, &option, &value) != UCI_OK)
 		return 1;
 
 	if (uci_load(ctx, package, &p) != UCI_OK) {
diff --git a/file.c b/file.c
index 9a2e353..a78c5a7 100644
--- a/file.c
+++ b/file.c
@@ -470,15 +470,14 @@ int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *packag
 	UCI_HANDLE_ERR(ctx);
 	UCI_ASSERT(ctx, stream != NULL);
 
-	if (package) {
+	if (package)
 		uci_export_package(package, stream, header);
-		goto done;
+	else {
+		uci_foreach_element(&ctx->root, e) {
+			uci_export_package(uci_to_package(e), stream, header);
+		}
 	}
 
-	uci_foreach_element(&ctx->root, e) {
-		uci_export_package(uci_to_package(e), stream, header);
-	}
-done:
 	return 0;
 }
 
diff --git a/uci.h b/uci.h
index c7251ab..0cb352d 100644
--- a/uci.h
+++ b/uci.h
@@ -60,9 +60,23 @@ struct uci_package;
 struct uci_section;
 struct uci_option;
 struct uci_history;
+struct uci_context;
 struct uci_parse_context;
 
 
+/**
+ * uci_parse_tuple: Parse an uci tuple
+ * @ctx: uci context
+ * @str: input string
+ * @package: output package pointer
+ * @section: output section pointer
+ * @option: output option pointer
+ * @value: output value pointer
+ *
+ * format: <package>[.<section>[.<option>]][=<value>]
+ */
+extern int uci_parse_tuple(struct uci_context *ctx, char *str, char **package, char **section, char **option, char **value);
+
 /**
  * uci_alloc_context: Allocate a new uci context
  */
diff --git a/util.c b/util.c
index c9be293..85e87ab 100644
--- a/util.c
+++ b/util.c
@@ -16,6 +16,8 @@
  * This file contains wrappers to standard functions, which
  * throw exceptions upon failure.
  */
+#include <stdbool.h>
+#include <ctype.h>
 
 static void *uci_malloc(struct uci_context *ctx, size_t size)
 {
@@ -49,4 +51,65 @@ static char *uci_strdup(struct uci_context *ctx, const char *str)
 	return ptr;
 }
 
+static bool validate_name(char *str)
+{
+	if (!*str)
+		return false;
+
+	while (*str) {
+		if (!isalnum(*str) && (*str != '_'))
+			return false;
+		str++;
+	}
+	return true;
+}
+
+int uci_parse_tuple(struct uci_context *ctx, char *str, char **package, char **section, char **option, char **value)
+{
+	char *last = NULL;
+
+	UCI_HANDLE_ERR(ctx);
+	UCI_ASSERT(ctx, str && package && section && option);
+
+	*package = strtok(str, ".");
+	if (!*package || !validate_name(*package))
+		goto error;
+
+	last = *package;
+	*section = strtok(NULL, ".");
+	if (!*section)
+		goto lastval;
+
+	last = *section;
+	*option = strtok(NULL, ".");
+	if (!*option)
+		goto lastval;
+
+	last = *option;
+
+lastval:
+	last = strchr(last, '=');
+	if (last) {
+		if (!value)
+			goto error;
+
+		*last = 0;
+		last++;
+		if (!*last)
+			goto error;
+	}
+
+	if (*section && !validate_name(*section))
+		goto error;
+	if (*option && !validate_name(*option))
+		goto error;
+
+	goto done;
+
+error:
+	UCI_THROW(ctx, UCI_ERR_PARSE);
+
+done:
+	return 0;
+}
 
-- 
2.25.1