nl-fib-lookup.c

/* SPDX-License-Identifier: LGPL-2.1-only */
/*
 * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
 */
 
#include <netlink/cli/utils.h>
 
#include <linux/rtnetlink.h>
 
static void print_usage(void)
{
        printf(
        "Usage: nl-fib-lookup [options] <addr>\n"
        "Options:\n"
        "   -t, --table <table>         Table id\n"
        "   -f, --fwmark <int>          Firewall mark\n"
        "   -s, --scope <scope>         Routing scope\n"
        "   -T, --tos <int>             Type of Service\n");
        exit(1);
}
 
int main(int argc, char *argv[])
{
        struct nl_sock *nlh;
        struct nl_cache *result;
        struct flnl_request *request;
        struct nl_addr *addr;
        struct nl_dump_params params = {
                .dp_fd = stdout,
                .dp_type = NL_DUMP_DETAILS,
        };
        int table = RT_TABLE_UNSPEC, scope = RT_SCOPE_UNIVERSE;
        int tos = 0, err = 1;
        uint64_t fwmark = 0;
 
        while (1) {
                static struct option long_opts[] = {
                        {"table", 1, 0, 't'},
                        {"fwmark", 1, 0, 'f'},
                        {"scope", 1, 0, 's'},
                        {"tos", 1, 0, 'T'},
                        {"help", 0, 0, 'h'},
                        {0, 0, 0, 0},
                };
                int c, idx = 0;
 
                c = getopt_long(argc, argv, "t:f:s:T:h", long_opts, &idx);
                if (c == -1)
                        break;
 
                switch (c) {
                case 't':
                        table = strtoul(optarg, NULL, 0);
                        break;
                case 'f':
                        fwmark = strtoul(optarg, NULL, 0);
                        break;
                case 's':
                        scope = strtoul(optarg, NULL, 0);
                        break;
                case 'T':
                        tos = strtoul(optarg, NULL, 0);
                        break;
                default:
                        print_usage();
                }
        }
 
        if (optind >= argc)
                print_usage();
 
        nlh = nl_cli_alloc_socket();
 
        if ((err = nl_addr_parse(argv[optind], AF_INET, &addr)) < 0)
                nl_cli_fatal(err, "Unable to parse address \"%s\": %s\n",
                        argv[optind], nl_geterror(err));
 
        result = flnl_result_alloc_cache();
        if (!result)
                nl_cli_fatal(ENOMEM, "Unable to allocate cache");
 
        request = flnl_request_alloc();
        if (!request)
                nl_cli_fatal(ENOMEM, "Unable to allocate request");
 
        flnl_request_set_table(request, table);
        flnl_request_set_fwmark(request, fwmark);
        flnl_request_set_scope(request, scope);
        flnl_request_set_tos(request, tos);
 
        err = flnl_request_set_addr(request, addr);
        nl_addr_put(addr);
        if (err < 0)
                nl_cli_fatal(err, "Unable to send request: %s", nl_geterror(err));
 
        nl_cli_connect(nlh, NETLINK_FIB_LOOKUP);
 
        err = flnl_lookup(nlh, request, result);
        if (err < 0)
                nl_cli_fatal(err, "Unable to lookup: %s\n", nl_geterror(err));
 
        nl_cache_dump(result, &params);
 
        return 0;
}