libifupdown: add config file loader

Makefile

@@ -35,7 +35,8 @@ LIBIFUPDOWN_SRC = \
 	libifupdown/environment.c \
 	libifupdown/execute.c \
 	libifupdown/lifecycle.c \
-	libifupdown/config-parser.c
+	libifupdown/config-parser.c \
+	libifupdown/config-file.c
 
 LIBIFUPDOWN_OBJ = ${LIBIFUPDOWN_SRC:.c=.o}
 LIBIFUPDOWN_LIB = libifupdown.a

libifupdown/config-file.c

@@ -0,0 +1,61 @@
+/*
+ * libifupdown/config-file.c
+ * Purpose: config file loading
+ *
+ * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * This software is provided 'as is' and without any warranty, express or
+ * implied.  In no event shall the authors be liable for any damages arising
+ * from the use of this software.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include "libifupdown/libifupdown.h"
+
+struct lif_config_file lif_config = {
+	.allow_addon_scripts = true,
+};
+
+static bool
+set_bool_value(const char *key, const char *value, void *opaque)
+{
+	(void) key;
+
+	if (*value == '1' ||
+		*value == 'Y' || *value == 'y' || 
+		*value == 'T' || *value == 't')
+		*(bool *) opaque = true;
+	else if (*value == '0' ||
+		*value == 'N' || *value == 'n' ||
+		*value == 'F' || *value == 'f')
+		*(bool *) opaque = false;
+	else
+		return false;
+
+	return true;
+}
+
+static struct lif_config_handler handlers[] = {
+	{"allow_addon_scripts", set_bool_value, &lif_config.allow_addon_scripts},
+};
+
+bool
+lif_config_load(const char *filename)
+{
+	FILE *fd = fopen(filename, "r");
+
+	if (fd == NULL)
+	{
+		fprintf(stderr, "ifupdown-ng: cannot open config %s: %s\n",
+			filename, strerror(errno));
+		return false;
+	}
+
+	return lif_config_parse_file(fd, filename, handlers, ARRAY_SIZE(handlers));
+}

libifupdown/config-file.h

@@ -0,0 +1,29 @@
+/*
+ * libifupdown/config-file.h
+ * Purpose: config file loading
+ *
+ * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * This software is provided 'as is' and without any warranty, express or
+ * implied.  In no event shall the authors be liable for any damages arising
+ * from the use of this software.
+ */
+
+#ifndef LIBIFUPDOWN__CONFIG_FILE_H
+#define LIBIFUPDOWN__CONFIG_FILE_H
+
+#include <stdbool.h>
+
+struct lif_config_file {
+	bool allow_addon_scripts;
+};
+
+extern struct lif_config_file lif_config;
+
+extern bool lif_config_load(const char *filename);
+
+#endif

libifupdown/libifupdown.h

@@ -27,6 +27,8 @@
 #include "libifupdown/execute.h"
 #include "libifupdown/lifecycle.h"
 #include "libifupdown/tokenize.h"
+#include "libifupdown/config-file.h"
+#include "libifupdown/config-parser.h"
 
 #ifndef ARRAY_SIZE
 # define ARRAY_SIZE(x)   (sizeof(x) / sizeof(*x))