/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  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 University 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 REGENTS 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 REGENTS 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.
 *
 * $FreeBSD: src/sbin/ifconfig/af_inet.c,v 1.2 2005/06/16 19:37:09 ume Exp $
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_var.h>         /* for struct ifaddr */
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <err.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "ifconfig.h"

static struct ifaliasreq in_addreq;
static struct ifreq in_ridreq;
static char addr_buf[NI_MAXHOST];  /* for getnameinfo() */

static void
in_status(int s __unused, const struct ifaddrs *ifa)
{
        struct sockaddr_in *sin, null_sin;
        int error, n_flags;

        memset(&null_sin, 0, sizeof(null_sin));

        sin = (struct sockaddr_in *)ifa->ifa_addr;
        if (sin == NULL)
                return;

        if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0)
                n_flags = 0;
        else if (f_addr != NULL && strcmp(f_addr, "host") == 0)
                n_flags = NI_NOFQDN;
        else
                n_flags = NI_NUMERICHOST;

        error = getnameinfo((struct sockaddr *)sin, sin->sin_len, addr_buf,
                            sizeof(addr_buf), NULL, 0, n_flags);
        if (error != 0)
                inet_ntop(AF_INET, &sin->sin_addr, addr_buf, sizeof(addr_buf));

        printf("\tinet %s", addr_buf);

        if (ifa->ifa_flags & IFF_POINTOPOINT) {
                sin = (struct sockaddr_in *)ifa->ifa_dstaddr;
                if (sin == NULL)
                        sin = &null_sin;
                printf(" --> %s", inet_ntoa(sin->sin_addr));
        }

        sin = (struct sockaddr_in *)ifa->ifa_netmask;
        if (sin == NULL)
                sin = &null_sin;
        if (f_inet != NULL && strcmp(f_inet, "cidr") == 0) {
                int cidr = 32;
                unsigned long smask = ntohl(sin->sin_addr.s_addr);

                while ((smask & 1) == 0) {
                        smask >>= 1;
                        cidr--;
                        if (cidr == 0)
                                break;
                }
                printf("/%d", cidr);
        } else if (f_inet != NULL && strcmp(f_inet, "dotted") == 0) {
                printf(" netmask %s", inet_ntoa(sin->sin_addr));
        } else {
                printf(" netmask 0x%lx",
                        (unsigned long)ntohl(sin->sin_addr.s_addr));
        }

        if (ifa->ifa_flags & IFF_BROADCAST) {
                sin = (struct sockaddr_in *)ifa->ifa_broadaddr;
                if (sin != NULL && sin->sin_addr.s_addr != 0)
                        printf(" broadcast %s", inet_ntoa(sin->sin_addr));
        }
        putchar('\n');
}

#define SIN(x) ((struct sockaddr_in *) &(x))
static struct sockaddr_in *sintab[] = {
        SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr),
        SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr)
};

static void
in_getaddr(const char *s, int which)
{
        struct sockaddr_in *sin = sintab[which];
        struct hostent *hp;
        struct netent *np;

        sin->sin_len = sizeof(*sin);
        if (which != MASK)
                sin->sin_family = AF_INET;

        if (which == ADDR) {
                char *p = NULL;

                if ((p = strrchr(s, '/')) != NULL) {
                        /* address is `name/masklen' */
                        int masklen, ret;
                        struct sockaddr_in *min = sintab[MASK];

                        *p = '\0';
                        ret = sscanf(p+1, "%u", &masklen);
                        if (ret != 1 || (masklen < 0 || masklen > 32)) {
                                *p = '/';
                                errx(1, "%s: bad value", s);
                        }
                        min->sin_len = sizeof(*min);
                        min->sin_addr.s_addr =
                            htonl(rounddown2(0xffffffff, 1LL << (32 - masklen)));
                }
        }

        if (inet_aton(s, &sin->sin_addr))
                return;
        if ((hp = gethostbyname(s)) != NULL)
                memcpy(&sin->sin_addr, hp->h_addr,
                       MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
        else if ((np = getnetbyname(s)) != NULL)
                sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY);
        else
                errx(1, "%s: bad value", s);
}

static void
in_status_tunnel(int s)
{
        char src[NI_MAXHOST];
        char dst[NI_MAXHOST];
        struct ifreq ifr;
        const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr;

        memset(&ifr, 0, sizeof(ifr));
        strlcpy(ifr.ifr_name, IfName, sizeof(ifr.ifr_name));

        if (ioctl(s, SIOCGIFPSRCADDR, &ifr) < 0)
                return;
        if (sa->sa_family != AF_INET)
                return;
        if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0,
                        NI_NUMERICHOST) != 0)
                src[0] = '\0';

        if (ioctl(s, SIOCGIFPDSTADDR, &ifr) < 0)
                return;
        if (sa->sa_family != AF_INET)
                return;
        if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0,
                        NI_NUMERICHOST) != 0)
                dst[0] = '\0';

        printf("\ttunnel inet %s --> %s\n", src, dst);
}

static void
in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres)
{
        struct ifaliasreq addreq;

        memset(&addreq, 0, sizeof(addreq));
        strlcpy(addreq.ifra_name, IfName, sizeof(addreq.ifra_name));
        memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
        memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len);

        if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0)
                warn("SIOCSIFPHYADDR");
}

static struct afswtch af_inet = {
        .af_name        = "inet",
        .af_af          = AF_INET,
        .af_status      = in_status,
        .af_getaddr     = in_getaddr,
        .af_status_tunnel = in_status_tunnel,
        .af_settunnel   = in_set_tunnel,
        .af_difaddr     = SIOCDIFADDR,
        .af_aifaddr     = SIOCAIFADDR,
        .af_ridreq      = &in_ridreq,
        .af_addreq      = &in_addreq,
};

__constructor(112)
static void
inet_ctor(void)
{
        af_register(&af_inet);
}