1 files changed, 62 insertions, 0 deletions
diff --git a/src/util-sysfs.c b/src/util-sysfs.c
new file mode 100644
index 0000000..11f1854
--- /dev/null
+++ b/src/util-sysfs.c
@@ -0,0 +1,62 @@
+/* Copyright (C) 2011-2022 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+/**
+ * \file
+ *
+ * \author Richard McConnell <richard_mcconnell@rapid7.com>
+ *
+ * Sysfs utility file
+ */
+
+#include "util-sysfs.h"
+
+#define SYSFS_MAX_FILENAME_LEN (SYSFS_MAX_FILENAME_SIZE + 5)
+
+TmEcode SysFsWriteValue(const char *path, int64_t value)
+{
+#if defined(__linux__)
+    char fname[SYSFS_MAX_FILENAME_LEN] = "/sys/";
+    char sentence[64];
+
+    if (!path || strlen(path) > SYSFS_MAX_FILENAME_SIZE) {
+        SCLogWarning("File path too long, max allowed: %d", SYSFS_MAX_FILENAME_SIZE);
+        SCReturnInt(TM_ECODE_FAILED);
+    }
+
+    strlcat(fname, path, sizeof(fname));
+
+    /* File must be present and process have correct capabilities to open */
+    int fd = open(fname, O_WRONLY);
+    if (fd < 0) {
+        SCLogError("Could not open file: %s", fname);
+        SCReturnInt(TM_ECODE_FAILED);
+    }
+
+    snprintf(sentence, sizeof(sentence), "%" PRIu64, value);
+    ssize_t len = strlen(sentence);
+
+    if (write(fd, sentence, len) != len) {
+        SCLogError("Could not write to file: %s", fname);
+        close(fd);
+        SCReturnInt(TM_ECODE_FAILED);
+    }
+    close(fd);
+#endif /* __LINUX__ */
+
+    SCReturnInt(TM_ECODE_OK);
+}