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/*
* cmd/multicall.c
* Purpose: multi-call binary frontend
*
* 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 <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include "cmd/multicall.h"
char *argv0;
struct if_applet ifupdown_applet;
const struct if_applet *self_applet = NULL;
static struct if_applet **applet_table = NULL;
static size_t applet_count = 0;
static int
applet_cmp(const void *a, const void *b)
{
const char *key = a;
const struct if_applet *applet = *(void **)b;
return strcmp(key, applet->name);
}
static int
applet_scmp(const void *a, const void *b)
{
const struct if_applet *key = *(void **)a;
const struct if_applet *applet = *(void **)b;
return strcmp(key->name, applet->name);
}
void
applet_register(struct if_applet *applet)
{
++applet_count;
applet_table = reallocarray(applet_table, applet_count, sizeof (void *));
applet_table[applet_count - 1] = applet;
qsort(applet_table, applet_count, sizeof (void *), applet_scmp);
}
void multicall_usage(int status) __attribute__((noreturn));
struct if_applet ifupdown_applet;
int
main(int argc, char *argv[])
{
argv0 = basename(argv[0]);
strtok(argv0, "-"); // strip optional -ng
const struct if_applet **app;
lif_config_load(CONFIG_FILE);
app = bsearch(argv0, applet_table,
applet_count, sizeof (void *),
applet_cmp);
if (app == NULL)
{
fprintf(stderr, "%s: applet not found\n", argv0);
multicall_usage(EXIT_FAILURE);
}
self_applet = *app;
if (self_applet != &ifupdown_applet)
process_options(*app, argc, argv);
return self_applet->main(argc, argv);
}
static int
multicall_main(int argc, char *argv[])
{
if (argc < 2)
multicall_usage(EXIT_FAILURE);
return main(argc - 1, argv + 1);
}
void
multicall_usage(int status)
{
fprintf(stderr,
PACKAGE_NAME " " PACKAGE_VERSION "\n"
"usage: ifupdown <applet> [options]\n"
"\n"
"Built-in applets:\n");
for (size_t i = 0; i < applet_count; i++)
{
if (applet_table[i] == &ifupdown_applet)
continue;
fprintf(stderr, " %-10s %s\n", applet_table[i]->name, applet_table[i]->desc);
}
exit(status);
}
struct if_applet ifupdown_applet = {
.name = "ifupdown",
.main = multicall_main,
.groups = { &global_option_group, NULL }
};
APPLET_REGISTER(ifupdown_applet)
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