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/*      $KAME: ifname.c,v 1.4 2001/08/20 02:32:40 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 <sys/cdefs.h>

#include <sys/types.h>

#include <sys/types.h>

/*

 * TODO:

 * - prototype defs into arpa/inet.h, not net/if.h (bsd-api-new-02)

 */

#include <sys/param.h>

#include <sys/socket.h>

#include <sys/sockio.h>

#include <sys/sysctl.h>

#include <net/if.h>

#include <net/route.h>

#include <net/if_dl.h>

#include <unistd.h>

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#define ROUNDUP(a) \

        ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))

#define ADVANCE(x, n)

static unsigned int

if_onametoindex(ifname)

        const char *ifname;

{

        struct if_nameindex *iff = if_nameindex(), *ifx;

        int ret;

        if (iff == NULL) return 0;

        ifx = iff;

        while (ifx->if_name != NULL) {

                if (strcmp(ifx->if_name, ifname) == 0) {

                        ret = ifx->if_index;

                        if_freenameindex(iff);

                        return ret;

                }

                ifx++;

        }

        if_freenameindex(iff);

        errno = ENXIO;

        return 0;

}

unsigned int

if_nametoindex(ifname)

        const char *ifname;

{

        int s;

        struct ifreq ifr;

        s = socket(AF_INET, SOCK_DGRAM, 0);

        if (s == -1)

                return (0);

        strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));

        if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) {

                close (s);

                return (if_onametoindex(ifname));

        }

        close(s);

        return (ifr.ifr_index);

}

char *

if_indextoname(ifindex, ifname)

        unsigned int ifindex;

        char *ifname; /* at least IF_NAMESIZE */

{

        struct if_nameindex *iff = if_nameindex(), *ifx;

        char *cp, *dp;

        if (iff == NULL) return NULL;

        ifx = iff;

        while (ifx->if_index != 0) {

                if (ifx->if_index == ifindex) {

                        cp = ifname;

                        dp = ifx->if_name;

                        while ((*cp++ = *dp++)) ;

                        if_freenameindex(iff);

                        return (ifname);

                }

                ifx++;

        }

        if_freenameindex(iff);

        errno = ENXIO;

        return NULL;

}

struct if_nameindex *

if_nameindex()

{

        size_t needed;

        int mib[6], i, ifn = 0, off = 0, hlen;

        char *buf = NULL, *lim, *next, *cp, *ifbuf = NULL;

        struct rt_msghdr *rtm;

        struct if_msghdr *ifm;

        struct sockaddr *sa;

        struct if_nameindex *ret = NULL;

        static int ifxs = 64;   /* initial upper limit */

        struct _ifx {

                int if_index;

                int if_off;

        } *ifx = NULL;

        mib[0] = CTL_NET;

        mib[1] = PF_ROUTE;

        mib[2] = 0;              /* protocol */

        mib[3] = 0;              /* wildcard address family */

        mib[4] = 0;

        mib[5] = 0;              /* no flags */

        if (__sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)

                return NULL;

        if ((buf = malloc(needed)) == NULL) {

                errno = ENOMEM;

                goto end;

        }

        /* XXX: we may have allocated too much than necessary */

        if ((ifbuf = malloc(needed)) == NULL) {

                errno = ENOMEM;

                goto end;

        }

        if ((ifx = (struct _ifx *)malloc(sizeof(*ifx) * ifxs)) == NULL) {

                errno = ENOMEM;

                goto end;

        }

        if (__sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {

                /* sysctl has set errno */

                goto end;

        }

        lim = buf + needed;

        for (next = buf; next < lim; next += rtm->rtm_msglen) {

                rtm = (struct rt_msghdr *)next;

                if (rtm->rtm_version != RTM_VERSION) {

                        errno = EPROTONOSUPPORT;

                        goto end;

                }

                switch (rtm->rtm_type) {

                case RTM_IFINFO:

                        ifm = (struct if_msghdr *)rtm;

                        ifx[ifn].if_index = ifm->ifm_index;

                        ifx[ifn].if_off = off;

                        cp = (char *)(ifm + 1);

                        for (i = 1; i; i <<= 1) {

                                if (i & ifm->ifm_addrs) {

                                        sa = (struct sockaddr *)cp;

                                        ADVANCE(cp, sa);

                                }

                        }

                        if (++ifn == ifxs) {

                                /* we need more memory */

                                struct _ifx *newifx;

                                ifxs *= 2;

                                if ((newifx = (struct _ifx *)malloc(sizeof(*newifx) * ifxs)) == NULL) {

                                        errno = ENOMEM;

                                        goto end;

                                }

                                /* copy and free old data */

                                memcpy(newifx, ifx, (sizeof(*ifx) * ifxs) / 2);

                                free(ifx);

                                ifx = newifx;

                        }

                }

        }

        hlen = sizeof(struct if_nameindex) * (ifn + 1);

        if ((cp = (char *)malloc(hlen + off)) == NULL) {

                errno = ENOMEM;

                goto end;

        }

        bcopy(ifbuf, cp + hlen, off);

        ret = (struct if_nameindex *)cp;

        for (i = 0; i < ifn; i++) {

                ret[i].if_index = ifx[i].if_index;

                ret[i].if_name = cp + hlen + ifx[i].if_off;

        }

        ret[ifn].if_index = 0;

        ret[ifn].if_name = NULL;

  end:

        if (buf) free(buf);

        if (ifbuf) free(ifbuf);

        if (ifx) free(ifx);

        return ret;

}

void if_freenameindex(ptr)

        struct if_nameindex *ptr;

{

        free(ptr);

}