1 files changed, 70 insertions, 0 deletions
diff --git a/src/integritysetup/integrity-util.c b/src/integritysetup/integrity-util.c
new file mode 100644
index 0000000..c2d2f95
--- /dev/null
+++ b/src/integritysetup/integrity-util.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#include "integrity-util.h"
+
+#include "extract-word.h"
+#include "fileio.h"
+#include "path-util.h"
+#include "percent-util.h"
+
+
+static int supported_integrity_algorithm(char *user_supplied) {
+        if (!STR_IN_SET(user_supplied, "crc32", "crc32c", "sha1", "sha256", "hmac-sha256"))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unsupported integrity algorithm (%s)", user_supplied);
+        return 0;
+}
+
+int parse_integrity_options(
+                const char *options,
+                uint32_t *ret_activate_flags,
+                int *ret_percent,
+                usec_t *ret_commit_time,
+                char **ret_data_device,
+                char **ret_integrity_alg) {
+        int r;
+
+        for (;;) {
+                _cleanup_free_ char *word = NULL;
+                char *val;
+
+                r = extract_first_word(&options, &word, ",", EXTRACT_DONT_COALESCE_SEPARATORS | EXTRACT_UNESCAPE_SEPARATORS);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to parse options: %m");
+                if (r == 0)
+                        break;
+                else if (streq(word, "allow-discards")) {
+                        if (ret_activate_flags)
+                                *ret_activate_flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
+                } else if ((val = startswith(word, "journal-watermark="))) {
+                        r = parse_percent(val);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse journal-watermark value or value out of range (%s)", val);
+                        if (ret_percent)
+                                *ret_percent = r;
+                } else if ((val = startswith(word, "journal-commit-time="))) {
+                        usec_t tmp_commit_time;
+                        r = parse_sec(val, &tmp_commit_time);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to parse journal-commit-time value (%s)", val);
+                        if (ret_commit_time)
+                                *ret_commit_time = tmp_commit_time;
+                } else if ((val = startswith(word, "data-device="))) {
+                        if (ret_data_device) {
+                                r = free_and_strdup(ret_data_device, val);
+                                if (r < 0)
+                                        return log_oom();
+                        }
+                } else if ((val = startswith(word, "integrity-algorithm="))) {
+                        r = supported_integrity_algorithm(val);
+                        if (r < 0)
+                                return r;
+                        if (ret_integrity_alg) {
+                                r = free_and_strdup(ret_integrity_alg, val);
+                                if (r < 0)
+                                        return log_oom();
+                        }
+                } else
+                        log_warning("Encountered unknown option '%s', ignoring.", word);
+        }
+
+        return r;
+}