118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
/*
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* cmd/ifquery.c
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* Purpose: look up information in /etc/network/interfaces
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*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <string.h>
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#include <getopt.h>
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#include "libifupdown/libifupdown.h"
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void
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print_interface(struct lif_interface *iface)
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{
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if (iface->is_auto)
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printf("auto %s\n", iface->ifname);
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printf("iface %s", iface->ifname);
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if (iface->is_loopback)
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printf(" inet loopback\n");
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else if (iface->is_dhcp)
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printf(" inet dhcp\n");
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else
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printf("\n");
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struct lif_node *iter;
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LIF_DICT_FOREACH(iter, &iface->vars)
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{
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struct lif_dict_entry *entry = iter->data;
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if (!strcmp(entry->key, "address"))
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{
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struct lif_address *addr = entry->data;
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char addr_buf[512];
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if (!lif_address_unparse(addr, addr_buf, sizeof addr_buf, true))
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{
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printf(" # warning: failed to unparse address\n");
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continue;
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}
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printf(" %s %s\n", entry->key, addr_buf);
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}
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else
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printf(" %s %s\n", entry->key, (const char *) entry->data);
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}
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}
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void
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usage()
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{
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printf("usage: ifquery [options] <interfaces>\n");
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printf(" ifquery [options] --list\n");
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printf("\nOptions:\n");
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printf(" -i, --interfaces FILE use FILE for interface definitions\n");
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exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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struct lif_dict collection;
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struct option long_options[] = {
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{"interfaces", required_argument, 0, 'i'},
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{NULL, 0, 0, 0}
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};
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char *interfaces_file = INTERFACES_FILE;
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for (;;)
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{
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int c = getopt_long(argc, argv, "i:", long_options, NULL);
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if (c == -1)
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break;
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switch (c) {
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case 'i':
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interfaces_file = optarg;
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break;
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}
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}
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if (!lif_interface_file_parse(&collection, interfaces_file))
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{
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fprintf(stderr, "ifquery: could not parse %s\n", interfaces_file);
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return EXIT_FAILURE;
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}
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if (optind >= argc)
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usage();
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int idx = optind;
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for (; idx < argc; idx++)
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{
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struct lif_dict_entry *entry = lif_dict_find(&collection, argv[idx]);
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if (entry == NULL)
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{
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fprintf(stderr, "ifquery: unknown interface %s\n", argv[idx]);
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return EXIT_FAILURE;
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}
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print_interface(entry->data);
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}
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return EXIT_SUCCESS;
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}
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