/*      $NetBSD: rip6query.c,v 1.11 2011/08/30 21:17:06 joerg Exp $     */
/*      $KAME: rip6query.c,v 1.17 2002/09/08 01:35:17 itojun Exp $      */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdio.h>

#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <errno.h>
#include <err.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>

#include <net/if.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <net/if_var.h>
#endif /* __FreeBSD__ >= 3 */
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h>

#include "route6d.h"

#define DEFAULT_WAIT    5

static int      s;
static int      query_wait = DEFAULT_WAIT;
static struct sockaddr_in6 sin6;
static struct rip6      *ripbuf;

#define RIPSIZE(n)      (sizeof(struct rip6) + (n-1) * sizeof(struct netinfo6))

__dead static void usage(void);
__dead static void sigalrm_handler(int);
static const char *sa_n2a(struct sockaddr *);
static const char *inet6_n2a(struct in6_addr *);

int
main(int argc, char **argv)
{
        struct netinfo6 *np;
        struct sockaddr_in6 fsock;
        int i, n, len;
        socklen_t flen;
        int c;
        int ifidx = -1;
        int error;
        char pbuf[NI_MAXSERV];
        struct addrinfo hints, *res;

        while ((c = getopt(argc, argv, "I:w:")) != -1) {
                switch (c) {
                case 'I':
                        ifidx = if_nametoindex(optarg);
                        if (ifidx == 0) {
                                errx(1, "invalid interface %s", optarg);
                                /*NOTREACHED*/
                        }
                        break;
                case 'w':
                        query_wait = atoi(optarg);
                        break;
                default:
                        usage();
                        /*NOTREACHED*/
                }
        }
        argv += optind;
        argc -= optind;

        if (argc != 1)
                usage();

        if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
                err(1, "socket");
                /*NOTREACHED*/
        }

        /* getaddrinfo is preferred for addr%scope syntax */
        snprintf(pbuf, sizeof(pbuf), "%d", RIP6_PORT);
        memset(&hints, 0, sizeof(hints));
        hints.ai_family = AF_INET6;
        hints.ai_socktype = SOCK_DGRAM;
        error = getaddrinfo(argv[0], pbuf, &hints, &res);
        if (error) {
                errx(1, "%s: %s", argv[0], gai_strerror(error));
                /*NOTREACHED*/
        }
        if (res->ai_next) {
                errx(1, "%s: %s", argv[0], "resolved to multiple addrs");
                /*NOTREACHED*/
        }
        if (sizeof(sin6) != res->ai_addrlen) {
                errx(1, "%s: %s", argv[0], "invalid addrlen");
                /*NOTREACHED*/
        }
        memcpy(&sin6, res->ai_addr, res->ai_addrlen);
        if (ifidx >= 0)
                sin6.sin6_scope_id = ifidx;

        if ((ripbuf = (struct rip6 *)malloc(BUFSIZ)) == NULL) {
                err(1, "malloc");
                /*NOTREACHED*/
        }
        ripbuf->rip6_cmd = RIP6_REQUEST;
        ripbuf->rip6_vers = RIP6_VERSION;
        ripbuf->rip6_res1[0] = 0;
        ripbuf->rip6_res1[1] = 0;
        np = ripbuf->rip6_nets;
        bzero(&np->rip6_dest, sizeof(struct in6_addr));
        np->rip6_tag = 0;
        np->rip6_plen = 0;
        np->rip6_metric = HOPCNT_INFINITY6;
        if (sendto(s, ripbuf, RIPSIZE(1), 0, (struct sockaddr *)&sin6,
            sizeof(struct sockaddr_in6)) < 0) {
                err(1, "send");
                /*NOTREACHED*/
        }
        signal(SIGALRM, sigalrm_handler);
        for (;;) {
                flen = sizeof(fsock);
                alarm(query_wait);
                if ((len = recvfrom(s, ripbuf, BUFSIZ, 0,
                    (struct sockaddr *)&fsock, &flen)) < 0) {
                        err(1, "recvfrom");
                        /*NOTREACHED*/
                }
                alarm(0);
                printf("Response from %s len %d\n",
                    sa_n2a((struct sockaddr *)&fsock), len);
                n = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
                    sizeof(struct netinfo6);
                np = ripbuf->rip6_nets;
                for (i = 0; i < n; i++, np++) {
                        printf("\t%s/%d [%d]", inet6_n2a(&np->rip6_dest),
                            np->rip6_plen, np->rip6_metric);
                        if (np->rip6_tag)
                                printf(" tag=0x%x", ntohs(np->rip6_tag));
                        printf("\n");
                }
        }

        exit(0);
}

static void
usage(void)
{
        fprintf(stderr, "usage: rip6query [-I iface] [-w wait] address\n");
        exit(1);
}

/* getnameinfo() is preferred as we may be able to show ifindex as ifname */
static const char *
sa_n2a(struct sockaddr *sa)
{
        static char buf[NI_MAXHOST];

        if (getnameinfo(sa, sa->sa_len, buf, sizeof(buf),
            NULL, 0, NI_NUMERICHOST) != 0) {
                snprintf(buf, sizeof(buf), "%s", "(invalid)");
        }
        return buf;
}

static const char *
inet6_n2a(struct in6_addr *addr)
{
        static char buf[NI_MAXHOST];

        return inet_ntop(AF_INET6, addr, buf, sizeof(buf));
}

static void
sigalrm_handler(int sig)
{

        _exit(0);
}