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//==========================================================================

//

//      src/ifaddrs.c

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD, 

// FreeBSD or other sources, and are covered by the appropriate

// copyright disclaimers included herein.

//

// Portions created by Red Hat are

// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//

// Adapted from KAME getifaddrs.c, if_nametoindex.c, if_indextoname.c

//

/*      $KAME: getifaddrs.c,v 1.9 2001/08/20 02:31:20 itojun Exp $      */

/*      $KAME: if_nametoindex.c,v 1.6 2000/11/24 08:18:54 itojun Exp $  */

/*      $KAME: if_indextoname.c,v 1.7 2000/11/08 03:09:30 itojun Exp $  */

/*

 * Copyright (c) 1995, 1999

 *      Berkeley Software Design, Inc.  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.

 *

 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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.

 *

 *      BSDI getifaddrs.c,v 2.12 2000/02/23 14:51:59 dab Exp

 */

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#undef _KERNEL

#undef __INSIDE_NET

#include <sys/param.h>

#include <sys/types.h>

#include <sys/ioctl.h>

#include <sys/socket.h>

#include <net/if.h>

#include <net/if_dl.h>

#include <errno.h>

#include <netinet/in.h>

#include <net/netdb.h>

#include <ifaddrs.h>

#if !defined(AF_LINK)

#define SA_LEN(sa)      sizeof(struct sockaddr)

#endif

#if !defined(SA_LEN)

#define SA_LEN(sa)      (sa)->sa_len

#endif

#define SALIGN  (sizeof(long) - 1)

#define SA_RLEN(sa)     ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))

#ifndef ALIGNBYTES

/*

 * On systems with a routing socket, ALIGNBYTES should match the value

 * that the kernel uses when building the messages.

 */

#define ALIGNBYTES      XXX

#endif

#ifndef ALIGN

#define ALIGN(p)        (((u_long)(p) + ALIGNBYTES) &~ ALIGNBYTES)

#endif

int

getifaddrs(struct ifaddrs **pif)

{

    int icnt = 1;  // Interface count

    int dcnt = 0;  // Data [length] count

    int ncnt = 0;  // Length of interface names

    char buf[1024];

    int i, sock;

    struct ifconf ifc;

    struct ifreq *ifr, *lifr;

    char *data, *names;

    struct ifaddrs *ifa, *ift;

    ifc.ifc_buf = buf;

    ifc.ifc_len = sizeof(buf);

    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)

        return (-1);

    i =  ioctl(sock, SIOCGIFCONF, (char *)&ifc);

    close(sock);

    if (i < 0)

        return (-1);

    ifr = ifc.ifc_req;

    lifr = (struct ifreq *)&ifc.ifc_buf[ifc.ifc_len];

    while (ifr < lifr) {

        struct sockaddr *sa;

        sa = &ifr->ifr_addr;

        ++icnt;

        dcnt += SA_RLEN(sa);

        ncnt += sizeof(ifr->ifr_name) + 1;

        if (SA_LEN(sa) < sizeof(*sa))

            ifr = (struct ifreq *)(((char *)sa) + sizeof(*sa));

        else

            ifr = (struct ifreq *)(((char *)sa) + SA_LEN(sa));

    }

    if (icnt + dcnt + ncnt == 1) {

        // Nothing found

        *pif = NULL;

        free(buf);

        return (0);

    }

    data = malloc(sizeof(struct ifaddrs) * icnt + dcnt + ncnt);

    if (data == NULL) {

        free(buf);

        return(-1);

    }

    ifa = (struct ifaddrs *)(void *)data;

    data += sizeof(struct ifaddrs) * icnt;

    names = data + dcnt;

    memset(ifa, 0, sizeof(struct ifaddrs) * icnt);

    ift = ifa;

    ifr = ifc.ifc_req;

    lifr = (struct ifreq *)&ifc.ifc_buf[ifc.ifc_len];

    while (ifr < lifr) {

        struct sockaddr *sa;

        ift->ifa_name = names;

        names[sizeof(ifr->ifr_name)] = 0;

        strncpy(names, ifr->ifr_name, sizeof(ifr->ifr_name));

        while (*names++) ;

        ift->ifa_addr = (struct sockaddr *)data;

        sa = &ifr->ifr_addr;

        memcpy(data, sa, SA_LEN(sa));

        data += SA_RLEN(sa);

        if (SA_LEN(sa) < sizeof(*sa))

            ifr = (struct ifreq *)(((char *)sa) + sizeof(*sa));

        else

            ifr = (struct ifreq *)(((char *)sa) + SA_LEN(sa));

        ift = (ift->ifa_next = ift + 1);

    }

    if (--ift >= ifa) {

        ift->ifa_next = NULL;

        *pif = ifa;

    } else {

        *pif = NULL;

        free(ifa);

    }

    return (0);

}

void

freeifaddrs(struct ifaddrs *ifp)

{

    free(ifp);

}

void

_show_all_interfaces(void)

{

    struct ifaddrs *iflist, *ifp;

    char addr[64];

    int indx;

    if (getifaddrs(&iflist) < 0) {

        diag_printf("Can't get interface information!!\n");

        return;

    }

    ifp = iflist;

    while (ifp != (struct ifaddrs *)NULL) {

        if (ifp->ifa_addr->sa_family != AF_LINK) {

            getnameinfo (ifp->ifa_addr, ifp->ifa_addr->sa_len, addr, sizeof(addr), 0, 0, 0);

            diag_printf("%p - %s - %s\n", ifp, ifp->ifa_name, addr);

        }

        ifp = ifp->ifa_next;

    }

    indx = if_nametoindex(iflist->ifa_name);

    diag_printf("indx(%s) = %d\n", iflist->ifa_name, indx);

    if (indx > 0) {

        if (if_indextoname(indx, addr)) {

            diag_printf("index(%s) = %d/%s\n", iflist->ifa_name, indx, addr);

        } else {

            diag_printf("index(%s) = %d: %s\n", iflist->ifa_name, indx, strerror(errno));

        }

    } else {

        diag_printf("index(%s): %s\n", iflist->ifa_name, strerror(errno));

    }

    freeifaddrs(iflist);

}

/*

 * From RFC 2553:

 *

 * 4.1 Name-to-Index

 *

 *

 *    The first function maps an interface name into its corresponding

 *    index.

 *

 *       #include <net/if.h>

 *

 *       unsigned int  if_nametoindex(const char *ifname);

 *

 *    If the specified interface name does not exist, the return value is

 *    0, and errno is set to ENXIO.  If there was a system error (such as

 *    running out of memory), the return value is 0 and errno is set to the

 *    proper value (e.g., ENOMEM).

 */

unsigned int

if_nametoindex(const char *ifname)

{

    struct ifaddrs *ifaddrs, *ifa;

    unsigned int ni;

    if (getifaddrs(&ifaddrs) < 0)

        return(0);

    ni = 0;

    for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {

        if (ifa->ifa_addr &&

            ifa->ifa_addr->sa_family == AF_LINK &&

            strcmp(ifa->ifa_name, ifname) == 0) {

            ni = ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index;

            break;

        }

    }

    freeifaddrs(ifaddrs);

    if (!ni)

        errno = ENXIO;

    return(ni);

}

/*

 * From RFC 2533:

 *

 * The second function maps an interface index into its corresponding

 * name.

 *

 *    #include <net/if.h>

 *

 *    char  *if_indextoname(unsigned int ifindex, char *ifname);

 *

 * The ifname argument must point to a buffer of at least IF_NAMESIZE

 * bytes into which the interface name corresponding to the specified

 * index is returned.  (IF_NAMESIZE is also defined in <net/if.h> and

 * its value includes a terminating null byte at the end of the

 * interface name.) This pointer is also the return value of the

 * function.  If there is no interface corresponding to the specified

 * index, NULL is returned, and errno is set to ENXIO, if there was a

 * system error (such as running out of memory), if_indextoname returns

 * NULL and errno would be set to the proper value (e.g., ENOMEM).

 */

char *

if_indextoname(unsigned int ifindex, char *ifname)

{

    struct ifaddrs *ifaddrs, *ifa;

    int error = 0;

    if (getifaddrs(&ifaddrs) < 0)

        return(NULL);   /* getifaddrs properly set errno */

    for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {

        if (ifa->ifa_addr &&

            ifa->ifa_addr->sa_family == AF_LINK &&

            ifindex == ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index)

            break;

    }

    if (ifa == NULL) {

        error = ENXIO;

        ifname = NULL;

    }

    else

        strncpy(ifname, ifa->ifa_name, IFNAMSIZ);

    freeifaddrs(ifaddrs);

    errno = error;

    return(ifname);

}