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-rw-r--r--src/basic/syslog-util.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/src/basic/syslog-util.c b/src/basic/syslog-util.c
new file mode 100644
index 0000000..0371922
--- /dev/null
+++ b/src/basic/syslog-util.c
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <syslog.h>
+
+#include "sd-id128.h"
+
+#include "glob-util.h"
+#include "hexdecoct.h"
+#include "macro.h"
+#include "path-util.h"
+#include "string-table.h"
+#include "syslog-util.h"
+#include "unit-name.h"
+
+int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
+ int a = 0, b = 0, c = 0;
+ const char *end;
+ size_t k;
+
+ assert(p);
+ assert(*p);
+ assert(priority);
+
+ if ((*p)[0] != '<')
+ return 0;
+
+ end = strchr(*p, '>');
+ if (!end)
+ return 0;
+
+ k = end - *p;
+ assert(k > 0);
+
+ if (k == 2)
+ c = undecchar((*p)[1]);
+ else if (k == 3) {
+ b = undecchar((*p)[1]);
+ c = undecchar((*p)[2]);
+ } else if (k == 4) {
+ a = undecchar((*p)[1]);
+ b = undecchar((*p)[2]);
+ c = undecchar((*p)[3]);
+ } else
+ return 0;
+
+ if (a < 0 || b < 0 || c < 0 ||
+ (!with_facility && (a || b || c > 7)))
+ return 0;
+
+ if (with_facility)
+ *priority = a*100 + b*10 + c;
+ else
+ *priority = (*priority & LOG_FACMASK) | c;
+
+ *p += k + 1;
+ return 1;
+}
+
+static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
+ [LOG_FAC(LOG_KERN)] = "kern",
+ [LOG_FAC(LOG_USER)] = "user",
+ [LOG_FAC(LOG_MAIL)] = "mail",
+ [LOG_FAC(LOG_DAEMON)] = "daemon",
+ [LOG_FAC(LOG_AUTH)] = "auth",
+ [LOG_FAC(LOG_SYSLOG)] = "syslog",
+ [LOG_FAC(LOG_LPR)] = "lpr",
+ [LOG_FAC(LOG_NEWS)] = "news",
+ [LOG_FAC(LOG_UUCP)] = "uucp",
+ [LOG_FAC(LOG_CRON)] = "cron",
+ [LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
+ [LOG_FAC(LOG_FTP)] = "ftp",
+ [LOG_FAC(LOG_LOCAL0)] = "local0",
+ [LOG_FAC(LOG_LOCAL1)] = "local1",
+ [LOG_FAC(LOG_LOCAL2)] = "local2",
+ [LOG_FAC(LOG_LOCAL3)] = "local3",
+ [LOG_FAC(LOG_LOCAL4)] = "local4",
+ [LOG_FAC(LOG_LOCAL5)] = "local5",
+ [LOG_FAC(LOG_LOCAL6)] = "local6",
+ [LOG_FAC(LOG_LOCAL7)] = "local7",
+};
+
+DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0));
+
+bool log_facility_unshifted_is_valid(int facility) {
+ return facility >= 0 && facility <= LOG_FAC(~0);
+}
+
+static const char *const log_level_table[] = {
+ [LOG_EMERG] = "emerg",
+ [LOG_ALERT] = "alert",
+ [LOG_CRIT] = "crit",
+ [LOG_ERR] = "err",
+ [LOG_WARNING] = "warning",
+ [LOG_NOTICE] = "notice",
+ [LOG_INFO] = "info",
+ [LOG_DEBUG] = "debug",
+};
+
+DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG);
+
+bool log_level_is_valid(int level) {
+ return level >= 0 && level <= LOG_DEBUG;
+}
+
+/* The maximum size for a log namespace length. This is the file name size limit 255 minus the size of a
+ * formatted machine ID minus a separator char */
+#define LOG_NAMESPACE_MAX (NAME_MAX - (SD_ID128_STRING_MAX - 1) - 1)
+
+bool log_namespace_name_valid(const char *s) {
+ /* Let's make sure the namespace fits in a filename that is prefixed with the machine ID and a dot
+ * (so that /var/log/journal/<machine-id>.<namespace> can be created based on it). Also make sure it
+ * is suitable as unit instance name, and does not contain fishy characters. */
+
+ if (!filename_is_valid(s))
+ return false;
+
+ if (strlen(s) > LOG_NAMESPACE_MAX)
+ return false;
+
+ if (!unit_instance_is_valid(s))
+ return false;
+
+ if (!string_is_safe(s))
+ return false;
+
+ /* Let's avoid globbing for now */
+ if (string_is_glob(s))
+ return false;
+
+ return true;
+}