/*
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* Copyright (c) 2017 Petr Vorel <pvorel@suse.cz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#define TST_NO_DEFAULT_MAIN
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#include "tst_test.h"
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#include "tst_net.h"
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#define DEFAULT_IPV4_PREFIX 24
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#define DEFAULT_IPV6_PREFIX 64
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static void usage(const char *cmd)
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{
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fprintf(stderr, "USAGE:\n"
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"%s IP_LHOST[/PREFIX]\n"
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"%s -r IP_RHOST[/PREFIX]\n"
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"%s -h\n\n"
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"Set IP variables without prefix and prefix for given IP.\n"
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"EXPORTED VARIABLES:\n"
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"Export one of the following variables without /prefix:\n"
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"IPV4_LHOST: IPv4 address of the local host\n"
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"IPV4_RHOST: IPv4 address of the remote host\n"
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"IPV6_LHOST: IPv6 address of the local host\n"
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"IPV6_RHOST: IPv6 address of the remote host\n"
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"Export one of the following variables:\n"
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"IPV4_LPREFIX: IPv4 prefix for IPV4_LNETWORK\n"
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"IPV4_RPREFIX: IPv4 prefix for IPV4_RNETWORK\n"
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"IPV6_LPREFIX: IPv6 prefix for IPV6_LNETWORK\n"
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"IPV6_RPREFIX: IPv6 prefix for IPV6_RNETWORK\n"
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"Default IPv4 prefix: %d.\n"
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"Default IPv6 prefix: %d.\n\n"
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"PARAMS:\n"
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"-h this help\n"
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"-r export remote environment variables\n",
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cmd, cmd, cmd, DEFAULT_IPV4_PREFIX, DEFAULT_IPV6_PREFIX);
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}
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static void print_ivar(const char *name, unsigned int val)
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{
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printf("export %s=%d\n", name, val);
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}
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int main(int argc, char *argv[])
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{
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char *ip_str = NULL, *prefix_str = NULL;
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int is_ipv6, is_rhost = 0, prefix;
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struct in_addr ip;
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struct in6_addr ip6;
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int is_usage = argc > 1 && (!strcmp(argv[1], "-h") ||
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!strcmp(argv[1], "--help"));
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if (argc < 2 || is_usage) {
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usage(argv[0]);
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exit(is_usage ? EXIT_SUCCESS : EXIT_FAILURE);
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}
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if (!strcmp(argv[1], "-r"))
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is_rhost = 1;
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ip_str = argv[is_rhost ? 2 : 1];
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is_ipv6 = !!strchr(ip_str, ':');
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prefix_str = strchr(ip_str, '/');
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if (prefix_str)
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prefix = get_prefix(ip_str, is_ipv6);
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else
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prefix = is_ipv6 ? DEFAULT_IPV6_PREFIX : DEFAULT_IPV4_PREFIX;
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/* checks for validity of IP string */
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if (is_ipv6)
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get_in6_addr(ip_str, &ip6);
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else
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get_in_addr(ip_str, &ip);
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if (is_ipv6) {
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print_ivar(is_rhost ? "IPV6_RPREFIX" : "IPV6_LPREFIX", prefix);
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print_svar(is_rhost ? "IPV6_RHOST" : "IPV6_LHOST", ip_str);
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} else {
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print_ivar(is_rhost ? "IPV4_RPREFIX" : "IPV4_LPREFIX", prefix);
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print_svar(is_rhost ? "IPV4_RHOST" : "IPV4_LHOST", ip_str);
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}
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exit(EXIT_SUCCESS);
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}
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