Add helper library for cron configuration

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>

2 files changed, 80 insertions, 0 deletions

diff --git a/lib/include/crontab.h b/lib/include/crontab.h
new file mode 100644
index 0000000..408d276
--- /dev/null
+++ b/lib/include/crontab.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * Copyright (C) 2018 - David Oberhollenzer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef CRONTAB_H
+#define CRONTAB_H
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <time.h>
+
+#include "service.h"
+
+typedef struct crontab_t {
+	struct crontab_t *next;
+	exec_t *exec;
+	char *ctty;
+
+	uid_t uid;
+	gid_t gid;
+	pid_t pid;
+
+	uint64_t minute;
+	uint32_t hour;
+	uint32_t dayofmonth;
+	uint16_t month;
+	uint8_t dayofweek;
+
+	unsigned int tty_truncate : 1;
+} crontab_t;
+
+crontab_t *rdcron(int dirfd, const char *filename);
+
+void delcron(crontab_t *cron);
+
+int cronscan(const char *directory, crontab_t **list);
+
+void cron_tm_to_mask(crontab_t *out, struct tm *t);
+
+bool cron_should_run(const crontab_t *t, const crontab_t *mask);
+
+#endif /* CRONTAB_H */
diff --git a/lib/include/libcfg.h b/lib/include/libcfg.h
index 83b9213..8096f1b 100644
--- a/lib/include/libcfg.h
+++ b/lib/include/libcfg.h
@@ -19,6 +19,7 @@
 #define LIBCONFIG_H
 
 #include <stdbool.h>
+#include <stddef.h>
 
 typedef struct {
 	int fd;			/* input file descriptor */
@@ -38,6 +39,20 @@ typedef struct {
 	bool comment;		/* inside a comment */
 } rdline_t;
 
+typedef struct {
+	/* keyword to map the callback to */
+	const char *key;
+
+	/*
+		If set, allow grouping repetitions of the keyword in a single
+		multi line '{' ... '}' block. The callback is called for each
+		line.
+	 */
+	unsigned int allow_block : 1;
+
+	int (*handle)(void *obj, char *arg, rdline_t *rd, int flags);
+} cfg_param_t;
+
 /*
 	Initialize the config line scanner.
 
@@ -104,4 +119,13 @@ int pack_argv(char *str);
  */
 int splitkv(rdline_t *rd, char **k, char **v);
 
+/*
+	Parse a configuration file containing '<keyword> [arguments...]' lines.
+	The cfgobj and flags are passed to the callback in the params array.
+
+	Returns zero on success.
+ */
+int rdcfg(void *cfgobj, rdline_t *rd, const cfg_param_t *params, size_t count,
+	  int flags);
+
 #endif /* LIBCONFIG_H */