add ifupdown skeleton

Makefile

@@ -24,23 +24,32 @@ LIBIFUPDOWN_OBJ = ${LIBIFUPDOWN_SRC:.c=.o}
 LIBIFUPDOWN_LIB = libifupdown.a
 
 
-CMDS = \
-	ifquery
+CMDS = ifquery ifup ifdown
 
 LIBS = ${LIBIFUPDOWN_LIB}
 
+all: libifupdown.a ${CMDS}
+
 IFQUERY_SRC = cmd/ifquery.c
 IFQUERY_OBJ = ${IFQUERY_SRC:.c=.o}
 ifquery: ${LIBS} ${IFQUERY_OBJ}
 	${CC} -o $@ ${IFQUERY_OBJ} ${LIBS}
 
+IFUPDOWN_SRC = cmd/ifupdown.c
+IFUPDOWN_OBJ = ${IFUPDOWN_SRC:.c=.o}
+ifup: ${LIBS} ${IFUPDOWN_OBJ}
+	${CC} -o $@ ${IFUPDOWN_OBJ} ${LIBS}
+
+ifdown: ifup
+	ln -s ifup $@
+
 libifupdown.a: ${LIBIFUPDOWN_OBJ}
 	${AR} -rcs $@ ${LIBIFUPDOWN_OBJ}
 
-all: libifupdown.a ${CMDS}
-
 clean:
-	rm -f ${LIBIFUPDOWN_OBJ} ${IFQUERY_OBJ}
+	rm -f ${LIBIFUPDOWN_OBJ} ${IFQUERY_OBJ} ${IFUPDOWN_OBJ}
 
 check: libifupdown.a ${CMDS}
 	kyua test
+
+default: all

cmd/ifupdown.c

@@ -0,0 +1,183 @@
+/*
+ * cmd/ifupdown.c
+ * Purpose: bring interfaces up or down
+ *
+ * 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.
+ */
+
+#define _GNU_SOURCE
+#include <fnmatch.h>
+#include <stdio.h>
+#include <string.h>
+#include <getopt.h>
+#include "libifupdown/libifupdown.h"
+
+struct match_options {
+	bool is_auto;
+	char *exclude_pattern;
+	char *include_pattern;
+};
+
+static const char *argv0;
+static bool up;
+static struct lif_execute_opts exec_opts = {};
+
+void
+usage()
+{
+	fprintf(stderr, "usage: %s [options] <interfaces>\n", argv0);
+
+	fprintf(stderr, "\nOptions:\n");
+	fprintf(stderr, "  -h, --help                   this help\n");
+	fprintf(stderr, "  -V, --version                show this program's version\n");
+	fprintf(stderr, "  -i, --interfaces FILE        use FILE for interface definitions\n");
+	fprintf(stderr, "  -S, --state-file FILE        use FILE for state\n");
+	fprintf(stderr, "  -a, --auto                   only match against interfaces hinted as 'auto'\n");
+	fprintf(stderr, "  -I, --include PATTERN        only match against interfaces matching PATTERN\n");
+	fprintf(stderr, "  -X, --exclude PATTERN        never match against interfaces matching PATTERN\n");
+	fprintf(stderr, "  -n, --no-act                 do not actually run any commands\n");
+	fprintf(stderr, "  -v, --verbose                show what commands are being run\n");
+
+	exit(1);
+}
+
+bool
+is_ifdown()
+{
+	if (strstr(argv0, "ifdown") != NULL)
+		return true;
+
+	return false;
+}
+
+bool
+change_interface(struct lif_interface *iface, struct lif_dict *state, const char *ifname)
+{
+	if (!lif_lifecycle_run(&exec_opts, iface, state, ifname, up))
+	{
+		fprintf(stderr, "%s: failed to bring interface %s %s\n",
+			argv0, ifname, up ? "up" : "down");
+		return false;
+	}
+
+	return true;
+}
+
+int
+main(int argc, char *argv[])
+{
+	argv0 = argv[0];
+	up = !is_ifdown();
+
+	struct lif_dict state = {};
+	struct lif_dict collection = {};
+	struct option long_options[] = {
+		{"help", no_argument, 0, 'h'},
+		{"version", no_argument, 0, 'V'},
+		{"interfaces", required_argument, 0, 'i'},
+		{"auto", no_argument, 0, 'a'},
+		{"include", required_argument, 0, 'I'},
+		{"exclude", required_argument, 0, 'X'},
+		{"state-file", required_argument, 0, 'S'},
+		{"no-act", no_argument, 0, 'n'},
+		{"verbose", no_argument, 0, 'v'},
+		{NULL, 0, 0, 0}
+	};
+	struct match_options match_opts = {};
+	char *interfaces_file = INTERFACES_FILE;
+	char *state_file = STATE_FILE;
+
+	for (;;)
+	{
+		int c = getopt_long(argc, argv, "hVi:aI:X:S:nv", long_options, NULL);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'h':
+			usage();
+			break;
+		case 'V':
+			lif_common_version();
+			break;
+		case 'i':
+			interfaces_file = optarg;
+			break;
+		case 'a':
+			match_opts.is_auto = true;
+			break;
+		case 'I':
+			match_opts.include_pattern = optarg;
+			break;
+		case 'X':
+			match_opts.exclude_pattern = optarg;
+			break;
+		case 'S':
+			state_file = optarg;
+			break;
+		case 'n':
+			exec_opts.mock = true;
+			exec_opts.verbose = true;
+			break;
+		case 'v':
+			exec_opts.verbose = true;
+			break;
+		}
+	}
+
+	if (!lif_state_read_path(&state, state_file))
+	{
+		fprintf(stderr, "ifquery: could not parse %s\n", state_file);
+		return EXIT_FAILURE;
+	}
+
+	if (!lif_interface_file_parse(&collection, interfaces_file))
+	{
+		fprintf(stderr, "ifquery: could not parse %s\n", interfaces_file);
+		return EXIT_FAILURE;
+	}
+
+	if (optind >= argc)
+		usage();
+
+	int idx = optind;
+	for (; idx < argc; idx++)
+	{
+		char lifbuf[4096];
+		strlcpy(lifbuf, argv[idx], sizeof lifbuf);
+
+		char *ifname = lifbuf;
+		char *lifname = lifbuf;
+		char *p;
+
+		if ((p = strchr(lifbuf, '=')) != NULL)
+		{
+			*p++ = '\0';
+			lifname = p;
+		}
+
+		struct lif_dict_entry *entry = lif_dict_find(&collection, lifname);
+
+		if (entry == NULL)
+		{
+			fprintf(stderr, "%s: unknown interface %s\n", argv0, argv[idx]);
+			return EXIT_FAILURE;
+		}
+
+		struct lif_interface *iface = entry->data;
+		if (!change_interface(iface, &state, ifname))
+			return EXIT_FAILURE;
+	}
+
+	/* XXX: update state file */
+
+	return EXIT_SUCCESS;
+}