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-rw-r--r--lib/util/filename_sane.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/lib/util/filename_sane.c b/lib/util/filename_sane.c
new file mode 100644
index 0000000..b52ce4d
--- /dev/null
+++ b/lib/util/filename_sane.c
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * filename_sane.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "util/util.h"
+
+#include <string.h>
+
+#if defined(_WIN32) || defined(__WINDOWS__) || defined(TEST_WIN32)
+#ifdef _MSC_VER
+#define strncasecmp _strnicmp
+#define strcasecmp _stricmp
+#endif
+
+static const char *bad_names[] = {
+ "CON", "PRN", "AUX", "NUL",
+ "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
+ "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
+};
+
+static bool is_allowed_by_os(const char *name)
+{
+ size_t len, i;
+
+ for (i = 0; i < sizeof(bad_names) / sizeof(bad_names[0]); ++i) {
+ len = strlen(bad_names[i]);
+
+ if (strncasecmp(name, bad_names[i], len) != 0)
+ continue;
+
+ if (name[len] == '\0')
+ return false;
+
+ if (name[len] == '.' && strchr(name + len + 1, '.') == NULL)
+ return false;
+ }
+
+ return true;
+}
+#else
+static bool is_allowed_by_os(const char *name)
+{
+ (void)name;
+ return true;
+}
+#endif
+
+bool is_filename_sane(const char *name, bool check_os_specific)
+{
+ if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
+ return false;
+
+ if (check_os_specific && !is_allowed_by_os(name))
+ return false;
+
+ while (*name != '\0') {
+ if (*name == '/')
+ return false;
+
+#if defined(_WIN32) || defined(__WINDOWS__) || defined(TEST_WIN32)
+ if (check_os_specific) {
+ if (*name == '<' || *name == '>' || *name == ':')
+ return false;
+ if (*name == '"' || *name == '|' || *name == '?')
+ return false;
+ if (*name == '*' || *name == '\\' || *name <= 31)
+ return false;
+ }
+#endif
+
+ ++name;
+ }
+
+ return true;
+}