busybox/libbb/interface.c

/*
 * stolen from net-tools-1.59 and stripped down for busybox by 
 *			Erik Andersen <andersee@debian.org>
 *
 * Heavily modified by Manuel Novoa III       Mar 12, 2001
 *
 * Pruned unused code using KEEP_UNUSED define.
 * Added print_bytes_scaled function to reduce code size.
 * Added some (potentially) missing defines.
 * Improved display support for -a and for a named interface.
 *
 * -----------------------------------------------------------
 *
 * ifconfig   This file contains an implementation of the command
 *              that either displays or sets the characteristics of
 *              one or more of the system's networking interfaces.
 *
 * Version:     $Id: interface.c,v 1.6 2001/10/27 03:28:19 andersen Exp $
 *
 * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
 *              and others.  Copyright 1993 MicroWalt Corporation
 *
 *              This program is free software; you can redistribute it
 *              and/or  modify it under  the terms of  the GNU General
 *              Public  License as  published  by  the  Free  Software
 *              Foundation;  either  version 2 of the License, or  (at
 *              your option) any later version.
 *
 * Patched to support 'add' and 'del' keywords for INET(4) addresses
 * by Mrs. Brisby <mrs.brisby@nimh.org>
 *
 * {1.34} - 19980630 - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *                     - gettext instead of catgets for i18n
 *          10/1998  - Andi Kleen. Use interface list primitives.       
 *	    20001008 - Bernd Eckenfels, Patch from RH for setting mtu 
 *			(default AF was wrong)
 */

/* #define KEEP_UNUSED */

/* 
 * 
 * Protocol Families.
 * 
 */
#define HAVE_AFINET 1
#undef HAVE_AFINET6
#undef HAVE_AFIPX
#undef HAVE_AFATALK
#undef HAVE_AFNETROM
#undef HAVE_AFX25
#undef HAVE_AFECONET
#undef HAVE_AFASH

/* 
 * 
 * Device Hardware types.
 * 
 */
#define HAVE_HWETHER	1
#define HAVE_HWPPP	1
#undef HAVE_HWSLIP


#include <features.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#if 0
#include <arpa/nameser.h>
#endif
#include "libbb.h"

#define _(x) x
#define _PATH_PROCNET_DEV               "/proc/net/dev"
#define new(p) ((p) = xcalloc(1,sizeof(*(p))))
#define KRELEASE(maj,min,patch) ((maj) * 65536 + (min)*256 + (patch))

static int procnetdev_vsn = 1;


/* Ugh.  But libc5 doesn't provide POSIX types.  */
#include <asm/types.h>


#ifdef HAVE_HWSLIP
#include <linux/if_slip.h>
#endif

#if HAVE_AFINET6

#ifndef _LINUX_IN6_H
/*
 *    This is in linux/include/net/ipv6.h.
 */

struct in6_ifreq {
    struct in6_addr ifr6_addr;
    __u32 ifr6_prefixlen;
    unsigned int ifr6_ifindex;
};

#endif

#endif				/* HAVE_AFINET6 */

#if HAVE_AFIPX
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
#include <netipx/ipx.h>
#else
#include "ipx.h"
#endif
#endif
#if 0
#include "net-support.h"
#include "pathnames.h"
#include "version.h"
#include "../intl.h"
#include "interface.h"
#include "sockets.h"
#include "util.h"
#endif

/* Defines for glibc2.0 users. */
#ifndef SIOCSIFTXQLEN
#define SIOCSIFTXQLEN      0x8943
#define SIOCGIFTXQLEN      0x8942
#endif

/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
#ifndef ifr_qlen
#define ifr_qlen        ifr_ifru.ifru_mtu
#endif

#ifndef HAVE_TXQUEUELEN
#define HAVE_TXQUEUELEN 1
#endif

#ifndef IFF_DYNAMIC
#define IFF_DYNAMIC     0x8000  /* dialup device with changing addresses */
#endif

/* This structure defines protocol families and their handlers. */
struct aftype {
    const char *name;
    const char *title;
    int af;
    int alen;
    char *(*print) (unsigned char *);
    char *(*sprint) (struct sockaddr *, int numeric);
    int (*input) (int type, char *bufp, struct sockaddr *);
    void (*herror) (char *text);
    int (*rprint) (int options);
    int (*rinput) (int typ, int ext, char **argv);

    /* may modify src */
    int (*getmask) (char *src, struct sockaddr * mask, char *name);

    int fd;
    char *flag_file;
};

static struct aftype *aftypes[];

#ifdef KEEP_UNUSED

static int flag_unx;
#ifdef HAVE_AFIPX
static int flag_ipx;
#endif
#ifdef HAVE_AFX25
static int flag_ax25;
#endif
#ifdef HAVE_AFATALK
static int flag_ddp;
#endif
#ifdef HAVE_AFNETROM
static int flag_netrom;
#endif
static int flag_inet;
#ifdef HAVE_AFINET6
static int flag_inet6;
#endif
#ifdef HAVE_AFECONET
static int flag_econet;
#endif
#ifdef HAVE_AFX25
static int flag_x25 = 0;
#endif
#ifdef HAVE_AFASH
static int flag_ash;
#endif


static struct aftrans_t {
    char *alias;
    char *name;
    int *flag;
} aftrans[] = {

#ifdef HAVE_AFX25
    {
	"ax25", "ax25", &flag_ax25
    },
#endif
    {
	"ip", "inet", &flag_inet
    },
#ifdef HAVE_AFINET6
    {
	"ip6", "inet6", &flag_inet6
    },
#endif
#ifdef HAVE_AFIPX
    {
	"ipx", "ipx", &flag_ipx
    },
#endif
#ifdef HAVE_AFATALK
    {
	"appletalk", "ddp", &flag_ddp
    },
#endif
#ifdef HAVE_AFNETROM
    {
	"netrom", "netrom", &flag_netrom
    },
#endif
    {
	"inet", "inet", &flag_inet
    },
#ifdef HAVE_AFINET6
    {
	"inet6", "inet6", &flag_inet6
    },
#endif
#ifdef HAVE_AFATALK
    {
	"ddp", "ddp", &flag_ddp
    },
#endif
    {
	"unix", "unix", &flag_unx
    },
    {
	"tcpip", "inet", &flag_inet
    },
#ifdef HAVE_AFECONET
    {
	"econet", "ec", &flag_econet
    },
#endif
#ifdef HAVE_AFX25
    {
	"x25", "x25", &flag_x25
    },
#endif
#ifdef HAVE_AFASH
    {
        "ash", "ash", &flag_ash
    },
#endif
    {
	0, 0, 0
    }
};

static char afname[256] = "";
#endif /* KEEP_UNUSED */

#if HAVE_AFUNIX

/* Display a UNIX domain address. */
static char *UNIX_print(unsigned char *ptr)
{
    return (ptr);
}


/* Display a UNIX domain address. */
static char *UNIX_sprint(struct sockaddr *sap, int numeric)
{
    static char buf[64];

    if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
	return safe_strncpy(buf, _("[NONE SET]"), sizeof(buf));
    return (UNIX_print(sap->sa_data));
}


static struct aftype unix_aftype =
{
    "unix", "UNIX Domain", AF_UNIX, 0,
    UNIX_print, UNIX_sprint, NULL, NULL,
    NULL, NULL, NULL,
    -1,
    "/proc/net/unix"
};
#endif				/* HAVE_AFUNIX */

#if HAVE_AFINET

#if 0
extern int h_errno;             /* some netdb.h versions don't export this */
#endif

/* cache */
struct addr {
    struct sockaddr_in addr;
    char *name;
    int host;
    struct addr *next;
};

static struct addr *INET_nn = NULL;	/* addr-to-name cache           */

#ifdef KEEP_UNUSED
static int INET_resolve(char *name, struct sockaddr_in *sin, int hostfirst)
{
    struct hostent *hp;
    struct netent *np;

    /* Grmpf. -FvK */
    sin->sin_family = AF_INET;
    sin->sin_port = 0;

    /* Default is special, meaning 0.0.0.0. */
    if (!strcmp(name, "default")) {
	sin->sin_addr.s_addr = INADDR_ANY;
	return (1);
    }
    /* Look to see if it's a dotted quad. */
    if (inet_aton(name, &sin->sin_addr)) {
	return 0;
    }
    /* If we expect this to be a hostname, try hostname database first */
#ifdef DEBUG
    if (hostfirst) fprintf (stderr, "gethostbyname (%s)\n", name);
#endif
    if (hostfirst && 
	(hp = gethostbyname(name)) != (struct hostent *) NULL) {
	memcpy((char *) &sin->sin_addr, (char *) hp->h_addr_list[0], 
		sizeof(struct in_addr));
	return 0;
    }
    /* Try the NETWORKS database to see if this is a known network. */
#ifdef DEBUG
    fprintf (stderr, "getnetbyname (%s)\n", name);
#endif
    if ((np = getnetbyname(name)) != (struct netent *) NULL) {
	sin->sin_addr.s_addr = htonl(np->n_net);
	return 1;
    }
    if (hostfirst) {
	/* Don't try again */
	errno = h_errno;
	return -1;
    }
#ifdef DEBUG
    res_init();
    _res.options |= RES_DEBUG;
#endif

#ifdef DEBUG
    fprintf (stderr, "gethostbyname (%s)\n", name);
#endif
    if ((hp = gethostbyname(name)) == (struct hostent *) NULL) {
	errno = h_errno;
	return -1;
    }
    memcpy((char *) &sin->sin_addr, (char *) hp->h_addr_list[0], 
	   sizeof(struct in_addr));

    return 0;
}
#endif /* KEEP_UNUSED */

/* numeric: & 0x8000: default instead of *, 
 *	    & 0x4000: host instead of net, 
 *	    & 0x0fff: don't resolve
 */
static int INET_rresolve(char *name, size_t len, struct sockaddr_in *s_in, 
			 int numeric, unsigned int netmask)
{
    struct hostent *ent;
    struct netent *np;
    struct addr *pn;
    unsigned long ad, host_ad;
    int host = 0;

    /* Grmpf. -FvK */
    if (s_in->sin_family != AF_INET) {
#ifdef DEBUG
	fprintf(stderr, _("rresolve: unsupport address family %d !\n"), s_in->sin_family);
#endif
	errno = EAFNOSUPPORT;
	return (-1);
    }
    ad = (unsigned long) s_in->sin_addr.s_addr;
#ifdef DEBUG
    fprintf (stderr, "rresolve: %08lx, mask %08x, num %08x \n", ad, netmask, numeric);
#endif
    if (ad == INADDR_ANY) {
	if ((numeric & 0x0FFF) == 0) {
	    if (numeric & 0x8000)
		safe_strncpy(name, "default", len);
	    else
	        safe_strncpy(name, "*", len);
	    return (0);
	}
    }
    if (numeric & 0x0FFF) {
        safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
	return (0);
    }

    if ((ad & (~netmask)) != 0 || (numeric & 0x4000))
	host = 1;
#if 0
    INET_nn = NULL;
#endif
    pn = INET_nn;
    while (pn != NULL) {
	if (pn->addr.sin_addr.s_addr == ad && pn->host == host) {
	    safe_strncpy(name, pn->name, len);
#ifdef DEBUG
	    fprintf (stderr, "rresolve: found %s %08lx in cache\n", (host? "host": "net"), ad);
#endif
	    return (0);
	}
	pn = pn->next;
    }

    host_ad = ntohl(ad);
    np = NULL;
    ent = NULL;
    if (host) {
#ifdef DEBUG
	fprintf (stderr, "gethostbyaddr (%08lx)\n", ad);
#endif
	ent = gethostbyaddr((char *) &ad, 4, AF_INET);
	if (ent != NULL)
	    safe_strncpy(name, ent->h_name, len);
    } else {
#ifdef DEBUG
	fprintf (stderr, "getnetbyaddr (%08lx)\n", host_ad);
#endif
#if 0
	np = getnetbyaddr(host_ad, AF_INET);
	if (np != NULL)
	    safe_strncpy(name, np->n_name, len);
#endif
    }
    if ((ent == NULL) && (np == NULL))
	safe_strncpy(name, inet_ntoa(s_in->sin_addr), len);
    pn = (struct addr *) xmalloc(sizeof(struct addr));
    pn->addr = *s_in;
    pn->next = INET_nn;
    pn->host = host;
    pn->name = (char *) xmalloc(strlen(name) + 1);
    strcpy(pn->name, name);
    INET_nn = pn;

    return (0);
}

#ifdef KEEP_UNUSED
static void INET_reserror(char *text)
{
    herror(text);
}

/* Display an Internet socket address. */
static char *INET_print(unsigned char *ptr)
{
    return (inet_ntoa((*(struct in_addr *) ptr)));
}
#endif /* KEEP_UNUSED */

/* Display an Internet socket address. */
static char *INET_sprint(struct sockaddr *sap, int numeric)
{
    static char buff[128];

    if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
	return safe_strncpy(buff, _("[NONE SET]"), sizeof(buff));

    if (INET_rresolve(buff, sizeof(buff), (struct sockaddr_in *) sap, 
		      numeric, 0xffffff00) != 0)
	return (NULL);

    return (buff);
}

#ifdef KEEP_UNUSED
static char *INET_sprintmask(struct sockaddr *sap, int numeric, 
		      unsigned int netmask)
{
    static char buff[128];

    if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
	return safe_strncpy(buff, _("[NONE SET]"), sizeof(buff));
    if (INET_rresolve(buff, sizeof(buff), (struct sockaddr_in *) sap, 
		      numeric, netmask) != 0)
	return (NULL);
    return (buff);
}

static int INET_getsock(char *bufp, struct sockaddr *sap)
{
    char *sp = bufp, *bp;
    unsigned int i;
    unsigned val;
    struct sockaddr_in *sin;

    sin = (struct sockaddr_in *) sap;
    sin->sin_family = AF_INET;
    sin->sin_port = 0;

    val = 0;
    bp = (char *) &val;
    for (i = 0; i < sizeof(sin->sin_addr.s_addr); i++) {
	*sp = toupper(*sp);

	if ((*sp >= 'A') && (*sp <= 'F'))
	    bp[i] |= (int) (*sp - 'A') + 10;
	else if ((*sp >= '0') && (*sp <= '9'))
	    bp[i] |= (int) (*sp - '0');
	else
	    return (-1);

	bp[i] <<= 4;
	sp++;
	*sp = toupper(*sp);

	if ((*sp >= 'A') && (*sp <= 'F'))
	    bp[i] |= (int) (*sp - 'A') + 10;
	else if ((*sp >= '0') && (*sp <= '9'))
	    bp[i] |= (int) (*sp - '0');
	else
	    return (-1);

	sp++;
    }
    sin->sin_addr.s_addr = htonl(val);

    return (sp - bufp);
}

static int INET_input(int type, char *bufp, struct sockaddr *sap)
{
    switch (type) {
    case 1:
	return (INET_getsock(bufp, sap));
    case 256:
	return (INET_resolve(bufp, (struct sockaddr_in *) sap, 1));
    default:
	return (INET_resolve(bufp, (struct sockaddr_in *) sap, 0));
    }
}

static int INET_getnetmask(char *adr, struct sockaddr *m, char *name)
{
    struct sockaddr_in *mask = (struct sockaddr_in *) m;
    char *slash, *end;
    int prefix;

    if ((slash = strchr(adr, '/')) == NULL)
	return 0;

    *slash++ = '\0';
    prefix = strtoul(slash, &end, 0);
    if (*end != '\0')
	return -1;

    if (name) {
	sprintf(name, "/%d", prefix);
    }
    mask->sin_family = AF_INET;
    mask->sin_addr.s_addr = htonl(~(0xffffffffU >> prefix));
    return 1;
}
#endif /* KEEP_UNUSED */

static struct aftype inet_aftype =
{
    "inet", "DARPA Internet", AF_INET, sizeof(unsigned long),
    NULL /* UNUSED INET_print */, INET_sprint,
	NULL /* UNUSED INET_input */, NULL /* UNUSED INET_reserror */,
    NULL /*INET_rprint */ , NULL /*INET_rinput */ ,
    NULL /* UNUSED INET_getnetmask */,
    -1,
    NULL
};

#endif				/* HAVE_AFINET */

/* Display an UNSPEC address. */
static char *UNSPEC_print(unsigned char *ptr)
{
    static char buff[sizeof(struct sockaddr)*3+1];
    char *pos;
    unsigned int i;

    pos = buff;
    for (i = 0; i < sizeof(struct sockaddr); i++) {
	/* careful -- not every libc's sprintf returns # bytes written */
	sprintf(pos, "%02X-", (*ptr++ & 0377));
	pos += 3;
    }
    /* Erase trailing "-".  Works as long as sizeof(struct sockaddr) != 0 */
    *--pos = '\0';
    return (buff);
}

/* Display an UNSPEC socket address. */
static char *UNSPEC_sprint(struct sockaddr *sap, int numeric)
{
    static char buf[64];

    if (sap->sa_family == 0xFFFF || sap->sa_family == 0)
	return safe_strncpy(buf, _("[NONE SET]"), sizeof(buf));
    return (UNSPEC_print(sap->sa_data));
}

static struct aftype unspec_aftype =
{
    "unspec", "UNSPEC", AF_UNSPEC, 0,
    UNSPEC_print, UNSPEC_sprint, NULL, NULL,
    NULL,
};

static struct aftype *aftypes[] =
{
#if HAVE_AFUNIX
    &unix_aftype,
#endif
#if HAVE_AFINET
    &inet_aftype,
#endif
#if HAVE_AFINET6
    &inet6_aftype,
#endif
#if HAVE_AFAX25
    &ax25_aftype,
#endif
#if HAVE_AFNETROM
    &netrom_aftype,
#endif
#if HAVE_AFROSE
    &rose_aftype,
#endif
#if HAVE_AFIPX
    &ipx_aftype,
#endif
#if HAVE_AFATALK
    &ddp_aftype,
#endif
#if HAVE_AFECONET
    &ec_aftype,
#endif
#if HAVE_AFASH
    &ash_aftype,
#endif
#if HAVE_AFX25
    &x25_aftype,
#endif
    &unspec_aftype,
    NULL
};

#ifdef KEEP_UNUSED
static short sVafinit = 0;

static void afinit()
{
    unspec_aftype.title = _("UNSPEC");
#if HAVE_AFUNIX
    unix_aftype.title = _("UNIX Domain");
#endif
#if HAVE_AFINET
    inet_aftype.title = _("DARPA Internet");
#endif
#if HAVE_AFINET6
    inet6_aftype.title = _("IPv6");
#endif
#if HAVE_AFAX25
    ax25_aftype.title = _("AMPR AX.25");
#endif
#if HAVE_AFNETROM
    netrom_aftype.title = _("AMPR NET/ROM");
#endif
#if HAVE_AFIPX
    ipx_aftype.title = _("Novell IPX");
#endif
#if HAVE_AFATALK
    ddp_aftype.title = _("Appletalk DDP");
#endif
#if HAVE_AFECONET
    ec_aftype.title = _("Econet");
#endif
#if HAVE_AFX25
    x25_aftype.title = _("CCITT X.25");
#endif
#if HAVE_AFROSE
    rose_aftype.title = _("AMPR ROSE");
#endif
#if HAVE_AFASH
    ash_aftype.title = _("Ash");
#endif	
    sVafinit = 1;
}

static int aftrans_opt(const char *arg)
{
    struct aftrans_t *paft;
    char *tmp1, *tmp2;
    char buf[256];

    safe_strncpy(buf, arg, sizeof(buf));

    tmp1 = buf;

    while (tmp1) {

	tmp2 = strchr(tmp1, ',');

	if (tmp2)
	    *(tmp2++) = '\0';

	paft = aftrans;
	for (paft = aftrans; paft->alias; paft++) {
	    if (strcmp(tmp1, paft->alias))
		continue;
	    if (strlen(paft->name) + strlen(afname) + 1 >= sizeof(afname)) {
		fprintf(stderr, _("Too much address family arguments.\n"));
		return (0);
	    }
	    if (paft->flag)
		(*paft->flag)++;
	    if (afname[0])
		strcat(afname, ",");
	    strcat(afname, paft->name);
	    break;
	}
	if (!paft->alias) {
	    fprintf(stderr, _("Unknown address family `%s'.\n"), tmp1);
	    return (1);
	}
	tmp1 = tmp2;
    }

    return (0);
}

/* set the default AF list from the program name or a constant value    */
static void aftrans_def(char *tool, char *argv0, char *dflt)
{
    char *tmp;
    char *buf;

    strcpy(afname, dflt);

    if (!(tmp = strrchr(argv0, '/')))
	tmp = argv0;		/* no slash?! */
    else
	tmp++;

    if (!(buf = strdup(tmp)))
	return;

    if (strlen(tool) >= strlen(tmp)) {
	free(buf);
	return;
    }
    tmp = buf + (strlen(tmp) - strlen(tool));

    if (strcmp(tmp, tool) != 0) {
	free(buf);
	return;
    }
    *tmp = '\0';
    if ((tmp = strchr(buf, '_')))
	*tmp = '\0';

    afname[0] = '\0';
    if (aftrans_opt(buf))
	strcpy(afname, buf);

    free(buf);
}

/* Check our protocol family table for this family. */
static struct aftype *get_aftype(const char *name)
{
    struct aftype **afp;

#ifdef KEEP_UNUSED
    if (!sVafinit)
	afinit();
#endif /* KEEP_UNUSED */

    afp = aftypes;
    while (*afp != NULL) {
	if (!strcmp((*afp)->name, name))
	    return (*afp);
	afp++;
    }
    if (strchr(name, ','))
	fprintf(stderr, _("Please don't supply more than one address family.\n"));
    return (NULL);
}
#endif /* KEEP_UNUSED */

/* Check our protocol family table for this family. */
static struct aftype *get_afntype(int af)
{
    struct aftype **afp;

#ifdef KEEP_UNUSED
    if (!sVafinit)
	afinit();
#endif /* KEEP_UNUSED */

    afp = aftypes;
    while (*afp != NULL) {
	if ((*afp)->af == af)
	    return (*afp);
	afp++;
    }
    return (NULL);
}

/* Check our protocol family table for this family and return its socket */
static int get_socket_for_af(int af)
{
    struct aftype **afp;

#ifdef KEEP_UNUSED
    if (!sVafinit)
	afinit();
#endif /* KEEP_UNUSED */

    afp = aftypes;
    while (*afp != NULL) {
	if ((*afp)->af == af)
	    return (*afp)->fd;
	afp++;
    }
    return -1;
}

#ifdef KEEP_UNUSED
/* type: 0=all, 1=getroute */
static void print_aflist(int type) {
    int count = 0;
    char * txt;
    struct aftype **afp;

#ifdef KEEP_UNUSED
    if (!sVafinit)
	afinit();
#endif /* KEEP_UNUSED */

    afp = aftypes;
    while (*afp != NULL) {
	if ((type == 1 && ((*afp)->rprint == NULL)) || ((*afp)->af == 0)) {
		afp++; continue;
	}
	if ((count % 3) == 0) fprintf(stderr,count?"\n    ":"    "); 
        txt = (*afp)->name; if (!txt) txt = "..";
	fprintf(stderr,"%s (%s) ",txt,_((*afp)->title));
	count++;
	afp++;
    }
    fprintf(stderr,"\n");
}
#endif /* KEEP_UNUSED */

struct user_net_device_stats {
    unsigned long long rx_packets;	/* total packets received       */
    unsigned long long tx_packets;	/* total packets transmitted    */
    unsigned long long rx_bytes;	/* total bytes received         */
    unsigned long long tx_bytes;	/* total bytes transmitted      */
    unsigned long rx_errors;	/* bad packets received         */
    unsigned long tx_errors;	/* packet transmit problems     */
    unsigned long rx_dropped;	/* no space in linux buffers    */
    unsigned long tx_dropped;	/* no space available in linux  */
    unsigned long rx_multicast;	/* multicast packets received   */
    unsigned long rx_compressed;
    unsigned long tx_compressed;
    unsigned long collisions;

    /* detailed rx_errors: */
    unsigned long rx_length_errors;
    unsigned long rx_over_errors;	/* receiver ring buff overflow  */
    unsigned long rx_crc_errors;	/* recved pkt with crc error    */
    unsigned long rx_frame_errors;	/* recv'd frame alignment error */
    unsigned long rx_fifo_errors;	/* recv'r fifo overrun          */
    unsigned long rx_missed_errors;	/* receiver missed packet     */
    /* detailed tx_errors */
    unsigned long tx_aborted_errors;
    unsigned long tx_carrier_errors;
    unsigned long tx_fifo_errors;
    unsigned long tx_heartbeat_errors;
    unsigned long tx_window_errors;
};

struct interface {
    struct interface *next, *prev; 
    char name[IFNAMSIZ];	/* interface name        */
    short type;			/* if type               */
    short flags;		/* various flags         */
    int metric;			/* routing metric        */
    int mtu;			/* MTU value             */
    int tx_queue_len;		/* transmit queue length */
    struct ifmap map;		/* hardware setup        */
    struct sockaddr addr;	/* IP address            */
    struct sockaddr dstaddr;	/* P-P IP address        */
    struct sockaddr broadaddr;	/* IP broadcast address  */
    struct sockaddr netmask;	/* IP network mask       */
    struct sockaddr ipxaddr_bb;	/* IPX network address   */
    struct sockaddr ipxaddr_sn;	/* IPX network address   */
    struct sockaddr ipxaddr_e3;	/* IPX network address   */
    struct sockaddr ipxaddr_e2;	/* IPX network address   */
    struct sockaddr ddpaddr;	/* Appletalk DDP address */
    struct sockaddr ecaddr;	/* Econet address        */
    int has_ip;
    int has_ipx_bb;
    int has_ipx_sn;
    int has_ipx_e3;
    int has_ipx_e2;
    int has_ax25;
    int has_ddp;
    int has_econet;
    char hwaddr[32];		/* HW address            */
    int statistics_valid;
    struct user_net_device_stats stats;		/* statistics            */
    int keepalive;		/* keepalive value for SLIP */
    int outfill;		/* outfill value for SLIP */
};


int interface_opt_a = 0;		/* show all interfaces          */

#ifdef KEEP_UNUSED
static int opt_i = 0;			/* show the statistics          */
static int opt_v = 0;			/* debugging output flag        */

static int addr_family = 0;		/* currently selected AF        */
#endif /* KEEP_UNUSED */

static struct interface *int_list, *int_last;
static int skfd = -1;			/* generic raw socket desc.     */


static int sockets_open(int family)
{
    struct aftype **aft;
    int sfd = -1;
    static int force = -1;

    if (force < 0) {
	force = 0;
	if (get_kernel_revision() < KRELEASE(2, 1, 0))
	    force = 1;
	if (access("/proc/net", R_OK))
	    force = 1;
    }
    for (aft = aftypes; *aft; aft++) {
	struct aftype *af = *aft;
	int type = SOCK_DGRAM;
	if (af->af == AF_UNSPEC)
	    continue;
	if (family && family != af->af)
	    continue;
	if (af->fd != -1) {
	    sfd = af->fd;
	    continue;
	}
	/* Check some /proc file first to not stress kmod */
	if (!family && !force && af->flag_file) {
	    if (access(af->flag_file, R_OK))
		continue;
	}
#if HAVE_AFNETROM
	if (af->af == AF_NETROM)
	    type = SOCK_SEQPACKET;
#endif
#if HAVE_AFX25
       if (af->af == AF_X25)
           type = SOCK_SEQPACKET;
#endif
	af->fd = socket(af->af, type, 0);
	if (af->fd >= 0)
	    sfd = af->fd;
    }
    if (sfd < 0)
	fprintf(stderr, _("No usable address families found.\n"));
    return sfd;
}

/* like strcmp(), but knows about numbers */
static int nstrcmp(const char *astr, const char *b)
{
    const char *a = astr;

    while (*a == *b) {
	if (*a == '\0')
	    return 0;
	a++;
	b++;
    }
    if (isdigit(*a)) {
	if (!isdigit(*b))
	    return -1;
	while (a > astr) {
	    a--;
	    if (!isdigit(*a)) {
		a++;
		break;
	    }
	    if (!isdigit(*b))
		return -1;
	    b--;
	}
	return atoi(a) > atoi(b) ? 1 : -1;
    }
    return *a - *b;
}

static struct interface *add_interface(char *name)
{
    struct interface *ife, **nextp, *new;

    for (ife = int_last; ife; ife = ife->prev) {
	    int n = nstrcmp(ife->name, name); 
	    if (n == 0) 
		    return ife; 
	    if (n < 0) 
		    break; 
    }
    new(new); 
    safe_strncpy(new->name, name, IFNAMSIZ); 
    nextp = ife ? &ife->next : &int_list;
    new->prev = ife;
    new->next = *nextp; 
    if (new->next) 
	    new->next->prev = new; 
    else
	    int_last = new; 
    *nextp = new; 
    return new; 
}


static int if_readconf(void)
{
    int numreqs = 30;
    struct ifconf ifc;
    struct ifreq *ifr;
    int n, err = -1;
    int skfd2;

    /* SIOCGIFCONF currently seems to only work properly on AF_INET sockets
       (as of 2.1.128) */ 
    skfd2 = get_socket_for_af(AF_INET);
    if (skfd2 < 0) {
	fprintf(stderr, _("warning: no inet socket available: %s\n"),
		strerror(errno));
	/* Try to soldier on with whatever socket we can get hold of.  */
	skfd2 = sockets_open(0);
	if (skfd2 < 0)
	    return -1;
    }

    ifc.ifc_buf = NULL;
    for (;;) {
	ifc.ifc_len = sizeof(struct ifreq) * numreqs;
	ifc.ifc_buf = xrealloc(ifc.ifc_buf, ifc.ifc_len);

	if (ioctl(skfd2, SIOCGIFCONF, &ifc) < 0) {
	    perror("SIOCGIFCONF");
	    goto out;
	}
	if (ifc.ifc_len == sizeof(struct ifreq) * numreqs) {
	    /* assume it overflowed and try again */
	    numreqs += 10;
	    continue;
	}
	break;
    }

    ifr = ifc.ifc_req;
    for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq)) {
	add_interface(ifr->ifr_name);
	ifr++;
    }
    err = 0;

out:
    free(ifc.ifc_buf);
    return err;
}

static char *get_name(char *name, char *p)
{
    while (isspace(*p))
	p++;
    while (*p) {
	if (isspace(*p))
	    break;
	if (*p == ':') {	/* could be an alias */
	    char *dot = p, *dotname = name;
	    *name++ = *p++;
	    while (isdigit(*p))
		*name++ = *p++;
	    if (*p != ':') {	/* it wasn't, backup */
		p = dot;
		name = dotname;
	    }
	    if (*p == '\0')
		return NULL;
	    p++;
	    break;
	}
	*name++ = *p++;
    }
    *name++ = '\0';
    return p;
}

static int get_dev_fields(char *bp, struct interface *ife)
{
    switch (procnetdev_vsn) {
    case 3:
	sscanf(bp,
	"%Lu %Lu %lu %lu %lu %lu %lu %lu %Lu %Lu %lu %lu %lu %lu %lu %lu",
	       &ife->stats.rx_bytes,
	       &ife->stats.rx_packets,
	       &ife->stats.rx_errors,
	       &ife->stats.rx_dropped,
	       &ife->stats.rx_fifo_errors,
	       &ife->stats.rx_frame_errors,
	       &ife->stats.rx_compressed,
	       &ife->stats.rx_multicast,

	       &ife->stats.tx_bytes,
	       &ife->stats.tx_packets,
	       &ife->stats.tx_errors,
	       &ife->stats.tx_dropped,
	       &ife->stats.tx_fifo_errors,
	       &ife->stats.collisions,
	       &ife->stats.tx_carrier_errors,
	       &ife->stats.tx_compressed);
	break;
    case 2:
	sscanf(bp, "%Lu %Lu %lu %lu %lu %lu %Lu %Lu %lu %lu %lu %lu %lu",
	       &ife->stats.rx_bytes,
	       &ife->stats.rx_packets,
	       &ife->stats.rx_errors,
	       &ife->stats.rx_dropped,
	       &ife->stats.rx_fifo_errors,
	       &ife->stats.rx_frame_errors,

	       &ife->stats.tx_bytes,
	       &ife->stats.tx_packets,
	       &ife->stats.tx_errors,
	       &ife->stats.tx_dropped,
	       &ife->stats.tx_fifo_errors,
	       &ife->stats.collisions,
	       &ife->stats.tx_carrier_errors);
	ife->stats.rx_multicast = 0;
	break;
    case 1:
	sscanf(bp, "%Lu %lu %lu %lu %lu %Lu %lu %lu %lu %lu %lu",
	       &ife->stats.rx_packets,
	       &ife->stats.rx_errors,
	       &ife->stats.rx_dropped,
	       &ife->stats.rx_fifo_errors,
	       &ife->stats.rx_frame_errors,

	       &ife->stats.tx_packets,
	       &ife->stats.tx_errors,
	       &ife->stats.tx_dropped,
	       &ife->stats.tx_fifo_errors,
	       &ife->stats.collisions,
	       &ife->stats.tx_carrier_errors);
	ife->stats.rx_bytes = 0;
	ife->stats.tx_bytes = 0;
	ife->stats.rx_multicast = 0;
	break;
    }
    return 0;
}

static inline int procnetdev_version(char *buf)
{
    if (strstr(buf, "compressed"))
	return 3;
    if (strstr(buf, "bytes"))
	return 2;
    return 1;
}

static int if_readlist_proc(char *target)
{
    static int proc_read; 
    FILE *fh;
    char buf[512];
    struct interface *ife;
    int err;

    if (proc_read) 
	    return 0; 
    if (!target) 
	    proc_read = 1;

    fh = fopen(_PATH_PROCNET_DEV, "r");
    if (!fh) {
		fprintf(stderr, _("Warning: cannot open %s (%s). Limited output.\n"),
			_PATH_PROCNET_DEV, strerror(errno)); 
		return if_readconf();
	}	
    fgets(buf, sizeof buf, fh);	/* eat line */
    fgets(buf, sizeof buf, fh);

#if 0				/* pretty, but can't cope with missing fields */
    fmt = proc_gen_fmt(_PATH_PROCNET_DEV, 1, fh,
		       "face", "",	/* parsed separately */
		       "bytes", "%lu",
		       "packets", "%lu",
		       "errs", "%lu",
		       "drop", "%lu",
		       "fifo", "%lu",
		       "frame", "%lu",
		       "compressed", "%lu",
		       "multicast", "%lu",
		       "bytes", "%lu",
		       "packets", "%lu",
		       "errs", "%lu",
		       "drop", "%lu",
		       "fifo", "%lu",
		       "colls", "%lu",
		       "carrier", "%lu",
		       "compressed", "%lu",
		       NULL);
    if (!fmt)
	return -1;
#else
    procnetdev_vsn = procnetdev_version(buf);
#endif

    err = 0;
    while (fgets(buf, sizeof buf, fh)) {
	char *s, name[IFNAMSIZ];
	s = get_name(name, buf);    
	ife = add_interface(name);
	get_dev_fields(s, ife);
	ife->statistics_valid = 1;
	if (target && !strcmp(target,name))
		break;
    }
    if (ferror(fh)) {
	perror(_PATH_PROCNET_DEV);
	err = -1;
	proc_read = 0; 
    }

#if 0
    free(fmt);
#endif
    fclose(fh);
    return err;
}

static int if_readlist(void) 
{ 
    int err = if_readlist_proc(NULL); 
    if (!err)
	    err = if_readconf();
    return err;
} 

static int for_all_interfaces(int (*doit) (struct interface *, void *), void *cookie)
{
    struct interface *ife;

    if (!int_list && (if_readlist() < 0))
	return -1;
    for (ife = int_list; ife; ife = ife->next) {
	int err = doit(ife, cookie);
	if (err)
	    return err;
    }
    return 0;
}

/* Support for fetching an IPX address */

#if HAVE_AFIPX
static int ipx_getaddr(int sock, int ft, struct ifreq *ifr)
{
    ((struct sockaddr_ipx *) &ifr->ifr_addr)->sipx_type = ft;
    return ioctl(sock, SIOCGIFADDR, ifr);
}
#endif


/* Fetch the interface configuration from the kernel. */
static int if_fetch(struct interface *ife)
{
    struct ifreq ifr;
    int fd;
    char *ifname = ife->name; 

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
	return (-1);
    ife->flags = ifr.ifr_flags;

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
	memset(ife->hwaddr, 0, 32);
    else
	memcpy(ife->hwaddr, ifr.ifr_hwaddr.sa_data, 8);

    ife->type = ifr.ifr_hwaddr.sa_family;

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0)
	ife->metric = 0;
    else
	ife->metric = ifr.ifr_metric;

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
	ife->mtu = 0;
    else
	ife->mtu = ifr.ifr_mtu;

#ifdef HAVE_HWSLIP
    if (ife->type == ARPHRD_SLIP || ife->type == ARPHRD_CSLIP ||
	ife->type == ARPHRD_SLIP6 || ife->type == ARPHRD_CSLIP6 ||
	ife->type == ARPHRD_ADAPT) {
#ifdef SIOCGOUTFILL
	strcpy(ifr.ifr_name, ifname);
	if (ioctl(skfd, SIOCGOUTFILL, &ifr) < 0)
	    ife->outfill = 0;
	else
	    ife->outfill = (unsigned int) ifr.ifr_data;
#endif
#ifdef SIOCGKEEPALIVE
	strcpy(ifr.ifr_name, ifname);
	if (ioctl(skfd, SIOCGKEEPALIVE, &ifr) < 0)
	    ife->keepalive = 0;
	else
	    ife->keepalive = (unsigned int) ifr.ifr_data;
#endif
    }
#endif

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0)
	memset(&ife->map, 0, sizeof(struct ifmap));
    else
	memcpy(&ife->map, &ifr.ifr_map, sizeof(struct ifmap));

    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFMAP, &ifr) < 0)
	memset(&ife->map, 0, sizeof(struct ifmap));
    else
	ife->map = ifr.ifr_map;

#ifdef HAVE_TXQUEUELEN
    strcpy(ifr.ifr_name, ifname);
    if (ioctl(skfd, SIOCGIFTXQLEN, &ifr) < 0)
	ife->tx_queue_len = -1;	/* unknown value */
    else
	ife->tx_queue_len = ifr.ifr_qlen;
#else
    ife->tx_queue_len = -1;	/* unknown value */
#endif

#if HAVE_AFINET
    /* IPv4 address? */
    fd = get_socket_for_af(AF_INET);
    if (fd >= 0) {
	strcpy(ifr.ifr_name, ifname);
	ifr.ifr_addr.sa_family = AF_INET;
	if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
	    ife->has_ip = 1;
	    ife->addr = ifr.ifr_addr;
	    strcpy(ifr.ifr_name, ifname);
	    if (ioctl(fd, SIOCGIFDSTADDR, &ifr) < 0)
	        memset(&ife->dstaddr, 0, sizeof(struct sockaddr));
	    else
	        ife->dstaddr = ifr.ifr_dstaddr;

	    strcpy(ifr.ifr_name, ifname);
	    if (ioctl(fd, SIOCGIFBRDADDR, &ifr) < 0)
	        memset(&ife->broadaddr, 0, sizeof(struct sockaddr));
	    else
		ife->broadaddr = ifr.ifr_broadaddr;

	    strcpy(ifr.ifr_name, ifname);
	    if (ioctl(fd, SIOCGIFNETMASK, &ifr) < 0)
		memset(&ife->netmask, 0, sizeof(struct sockaddr));
	    else
		ife->netmask = ifr.ifr_netmask;
	} else
	    memset(&ife->addr, 0, sizeof(struct sockaddr));
    }
#endif

#if HAVE_AFATALK
    /* DDP address maybe ? */
    fd = get_socket_for_af(AF_APPLETALK);
    if (fd >= 0) {
	strcpy(ifr.ifr_name, ifname);
	if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
	    ife->ddpaddr = ifr.ifr_addr;
	    ife->has_ddp = 1;
	}
    }
#endif

#if HAVE_AFIPX
    /* Look for IPX addresses with all framing types */
    fd = get_socket_for_af(AF_IPX);
    if (fd >= 0) {
	strcpy(ifr.ifr_name, ifname);
	if (!ipx_getaddr(fd, IPX_FRAME_ETHERII, &ifr)) {
	    ife->has_ipx_bb = 1;
	    ife->ipxaddr_bb = ifr.ifr_addr;
	}
	strcpy(ifr.ifr_name, ifname);
	if (!ipx_getaddr(fd, IPX_FRAME_SNAP, &ifr)) {
	    ife->has_ipx_sn = 1;
	    ife->ipxaddr_sn = ifr.ifr_addr;
	}
	strcpy(ifr.ifr_name, ifname);
	if (!ipx_getaddr(fd, IPX_FRAME_8023, &ifr)) {
	    ife->has_ipx_e3 = 1;
	    ife->ipxaddr_e3 = ifr.ifr_addr;
	}
	strcpy(ifr.ifr_name, ifname);
	if (!ipx_getaddr(fd, IPX_FRAME_8022, &ifr)) {
	    ife->has_ipx_e2 = 1;
	    ife->ipxaddr_e2 = ifr.ifr_addr;
	}
    }
#endif

#if HAVE_AFECONET
    /* Econet address maybe? */
    fd = get_socket_for_af(AF_ECONET);
    if (fd >= 0) {
	strcpy(ifr.ifr_name, ifname);
	if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
	    ife->ecaddr = ifr.ifr_addr;
	    ife->has_econet = 1;
	}
    }
#endif

    return 0;
}


static int do_if_fetch(struct interface *ife)
{ 
    if (if_fetch(ife) < 0) {
	char *errmsg; 
	if (errno == ENODEV) { 
	    /* Give better error message for this case. */ 
	    errmsg = _("Device not found"); 
	} else { 
	    errmsg = strerror(errno); 
	}
  	fprintf(stderr, _("%s: error fetching interface information: %s\n"),
		ife->name, errmsg);
	return -1;
    }
    return 0; 
}

/* This structure defines hardware protocols and their handlers. */
struct hwtype {
    const char *name;
    const char *title;
    int type;
    int alen;
    char *(*print) (unsigned char *);
    int (*input) (char *, struct sockaddr *);
    int (*activate) (int fd);
    int suppress_null_addr;
};

static struct hwtype unspec_hwtype =
{
    "unspec", "UNSPEC", -1, 0,
    UNSPEC_print, NULL, NULL
};

static struct hwtype loop_hwtype =
{
    "loop", "Local Loopback", ARPHRD_LOOPBACK, 0,
    NULL, NULL, NULL
};

#if HAVE_HWETHER
#include <net/if_arp.h>
#include <linux/if_ether.h>

static struct hwtype ether_hwtype;

/* Display an Ethernet address in readable format. */
static char *pr_ether(unsigned char *ptr)
{
    static char buff[64];

    snprintf(buff, sizeof(buff), "%02X:%02X:%02X:%02X:%02X:%02X",
	     (ptr[0] & 0377), (ptr[1] & 0377), (ptr[2] & 0377),
	     (ptr[3] & 0377), (ptr[4] & 0377), (ptr[5] & 0377)
	);
    return (buff);
}

#ifdef KEEP_UNUSED
/* Input an Ethernet address and convert to binary. */
static int in_ether(char *bufp, struct sockaddr *sap)
{
    unsigned char *ptr;
    char c, *orig;
    int i;
    unsigned val;

    sap->sa_family = ether_hwtype.type;
    ptr = sap->sa_data;

    i = 0;
    orig = bufp;
    while ((*bufp != '\0') && (i < ETH_ALEN)) {
	val = 0;
	c = *bufp++;
	if (isdigit(c))
	    val = c - '0';
	else if (c >= 'a' && c <= 'f')
	    val = c - 'a' + 10;
	else if (c >= 'A' && c <= 'F')
	    val = c - 'A' + 10;
	else {
#ifdef DEBUG
	    fprintf(stderr, _("in_ether(%s): invalid ether address!\n"), orig);
#endif
	    errno = EINVAL;
	    return (-1);
	}
	val <<= 4;
	c = *bufp;
	if (isdigit(c))
	    val |= c - '0';
	else if (c >= 'a' && c <= 'f')
	    val |= c - 'a' + 10;
	else if (c >= 'A' && c <= 'F')
	    val |= c - 'A' + 10;
	else if (c == ':' || c == 0)
	    val >>= 4;
	else {
#ifdef DEBUG
	    fprintf(stderr, _("in_ether(%s): invalid ether address!\n"), orig);
#endif
	    errno = EINVAL;
	    return (-1);
	}
	if (c != 0)
	    bufp++;
	*ptr++ = (unsigned char) (val & 0377);
	i++;

	/* We might get a semicolon here - not required. */
	if (*bufp == ':') {
	    if (i == ETH_ALEN) {
#ifdef DEBUG
		fprintf(stderr, _("in_ether(%s): trailing : ignored!\n"),
			orig)
#endif
		    ;		/* nothing */
	    }
	    bufp++;
	}
    }

    /* That's it.  Any trailing junk? */
    if ((i == ETH_ALEN) && (*bufp != '\0')) {
#ifdef DEBUG
	fprintf(stderr, _("in_ether(%s): trailing junk!\n"), orig);
	errno = EINVAL;
	return (-1);
#endif
    }
#ifdef DEBUG
    fprintf(stderr, "in_ether(%s): %s\n", orig, pr_ether(sap->sa_data));
#endif

    return (0);
}
#endif /* KEEP_UNUSED */


static struct hwtype ether_hwtype =
{
    "ether", "Ethernet", ARPHRD_ETHER, ETH_ALEN,
    pr_ether, NULL /* UNUSED in_ether */, NULL
};


#endif				/* HAVE_HWETHER */


#if HAVE_HWPPP

#include <net/if_arp.h>

#ifdef KEEP_UNUSED
/* Start the PPP encapsulation on the file descriptor. */
static int do_ppp(int fd)
{
    fprintf(stderr, _("You cannot start PPP with this program.\n"));
    return -1;
}
#endif /* KEEP_UNUSED */

static struct hwtype ppp_hwtype =
{
    "ppp", "Point-Point Protocol", ARPHRD_PPP, 0,
    NULL, NULL, NULL /* UNUSED do_ppp */, 0
};


#endif				/* HAVE_PPP */

static struct hwtype *hwtypes[] =
{

    &loop_hwtype,

#if HAVE_HWSLIP
    &slip_hwtype,
    &cslip_hwtype,
    &slip6_hwtype,
    &cslip6_hwtype,
    &adaptive_hwtype,
#endif
#if HAVE_HWSTRIP
    &strip_hwtype,
#endif
#if HAVE_HWASH
    &ash_hwtype,
#endif
#if HAVE_HWETHER
    &ether_hwtype,
#endif
#if HAVE_HWTR
    &tr_hwtype,
#ifdef ARPHRD_IEEE802_TR
    &tr_hwtype1, 
#endif
#endif
#if HAVE_HWAX25
    &ax25_hwtype,
#endif
#if HAVE_HWNETROM
    &netrom_hwtype,
#endif
#if HAVE_HWROSE
    &rose_hwtype,
#endif
#if HAVE_HWTUNNEL
    &tunnel_hwtype,
#endif
#if HAVE_HWPPP
    &ppp_hwtype,
#endif
#if HAVE_HWHDLCLAPB
    &hdlc_hwtype,
    &lapb_hwtype,
#endif
#if HAVE_HWARC
    &arcnet_hwtype,
#endif
#if HAVE_HWFR
    &dlci_hwtype,
    &frad_hwtype,
#endif
#if HAVE_HWSIT
    &sit_hwtype,
#endif
#if HAVE_HWFDDI
    &fddi_hwtype,
#endif
#if HAVE_HWHIPPI
    &hippi_hwtype,
#endif
#if HAVE_HWIRDA
    &irda_hwtype,
#endif
#if HAVE_HWEC
    &ec_hwtype,
#endif
#if HAVE_HWX25
    &x25_hwtype,
#endif
    &unspec_hwtype,
    NULL
};

#ifdef KEEP_UNUSED
static short sVhwinit = 0;

static void hwinit()
{
    loop_hwtype.title = _("Local Loopback");
    unspec_hwtype.title = _("UNSPEC");
#if HAVE_HWSLIP
    slip_hwtype.title = _("Serial Line IP");
    cslip_hwtype.title = _("VJ Serial Line IP");
    slip6_hwtype.title = _("6-bit Serial Line IP");
    cslip6_hwtype.title = _("VJ 6-bit Serial Line IP");
    adaptive_hwtype.title = _("Adaptive Serial Line IP");
#endif
#if HAVE_HWETHER
    ether_hwtype.title = _("Ethernet");
#endif
#if HAVE_HWASH
    ash_hwtype.title = _("Ash");
#endif
#if HAVE_HWFDDI
    fddi_hwtype.title = _("Fiber Distributed Data Interface");
#endif
#if HAVE_HWHIPPI
    hippi_hwtype.title = _("HIPPI");
#endif
#if HAVE_HWAX25
    ax25_hwtype.title = _("AMPR AX.25");
#endif
#if HAVE_HWROSE
    rose_hwtype.title = _("AMPR ROSE");
#endif
#if HAVE_HWNETROM
    netrom_hwtype.title = _("AMPR NET/ROM");
#endif
#if HAVE_HWX25
    x25_hwtype.title = _("generic X.25");
#endif
#if HAVE_HWTUNNEL
    tunnel_hwtype.title = _("IPIP Tunnel");
#endif
#if HAVE_HWPPP
    ppp_hwtype.title = _("Point-to-Point Protocol");
#endif
#if HAVE_HWHDLCLAPB
    hdlc_hwtype.title = _("(Cisco)-HDLC");
    lapb_hwtype.title = _("LAPB");
#endif
#if HAVE_HWARC
    arcnet_hwtype.title = _("ARCnet");
#endif
#if HAVE_HWFR
    dlci_hwtype.title = _("Frame Relay DLCI");
    frad_hwtype.title = _("Frame Relay Access Device");
#endif
#if HAVE_HWSIT
    sit_hwtype.title = _("IPv6-in-IPv4");
#endif
#if HAVE_HWIRDA
    irda_hwtype.title = _("IrLAP");
#endif
#if HAVE_HWTR
    tr_hwtype.title = _("16/4 Mbps Token Ring");
#ifdef ARPHRD_IEEE802_TR
    tr_hwtype1.title = _("16/4 Mbps Token Ring (New)") ; 
#endif
#endif
#if HAVE_HWEC
    ec_hwtype.title = _("Econet");
#endif
    sVhwinit = 1;
}
#endif /* KEEP_UNUSED */

#ifdef IFF_PORTSEL
static const char *if_port_text[][4] =
{
    /* Keep in step with <linux/netdevice.h> */
    {"unknown", NULL, NULL, NULL},
    {"10base2", "bnc", "coax", NULL},
    {"10baseT", "utp", "tpe", NULL},
    {"AUI", "thick", "db15", NULL},
    {"100baseT", NULL, NULL, NULL},
    {"100baseTX", NULL, NULL, NULL},
    {"100baseFX", NULL, NULL, NULL},
    {NULL, NULL, NULL, NULL},
};
#endif

/* Check our hardware type table for this type. */
static struct hwtype *get_hwntype(int type)
{
    struct hwtype **hwp;

#ifdef KEEP_UNUSED
    if (!sVhwinit)
	hwinit();
#endif /* KEEP_UNUSED */

    hwp = hwtypes;
    while (*hwp != NULL) {
	if ((*hwp)->type == type)
	    return (*hwp);
	hwp++;
    }
    return (NULL);
}

/* return 1 if address is all zeros */
static int hw_null_address(struct hwtype *hw, void *ap)
{
    unsigned int i;
    unsigned char *address = (unsigned char *)ap;
    for (i = 0; i < hw->alen; i++)
	if (address[i])
	    return 0;
    return 1;
}

static const char TRext[] = "\0\0k\0M";

static void print_bytes_scaled(unsigned long long ull, const char *end)
{
	unsigned long long int_part;
	unsigned long frac_part;
	const char *ext;
	int i;

	frac_part = 0;
	ext = TRext;
	int_part = ull;
	for (i=0 ; i<2 ; i++) {
		if (int_part >= 1024) {
			frac_part = ((int_part % 1024) * 10) / 1024;
			int_part /= 1024;
			ext += 2;			/* Kb, Mb */
		}
	}

	printf("X bytes:%Lu (%Lu.%lu %sb)%s", ull, int_part, frac_part, ext, end);
}

static void ife_print(struct interface *ptr)
{
    struct aftype *ap;
    struct hwtype *hw;
    int hf;
    int can_compress = 0;

#if HAVE_AFIPX
    static struct aftype *ipxtype = NULL;
#endif
#if HAVE_AFECONET
    static struct aftype *ectype = NULL;
#endif
#if HAVE_AFATALK
    static struct aftype *ddptype = NULL;
#endif
#if HAVE_AFINET6
    FILE *f;
    char addr6[40], devname[20];
    struct sockaddr_in6 sap;
    int plen, scope, dad_status, if_idx;
    extern struct aftype inet6_aftype;
    char addr6p[8][5];
#endif

    ap = get_afntype(ptr->addr.sa_family);
    if (ap == NULL)
	ap = get_afntype(0);

    hf = ptr->type;

    if (hf == ARPHRD_CSLIP || hf == ARPHRD_CSLIP6)
	can_compress = 1;

    hw = get_hwntype(hf);
    if (hw == NULL)
	hw = get_hwntype(-1);

    printf(_("%-9.9s Link encap:%s  "), ptr->name, _(hw->title));
    /* For some hardware types (eg Ash, ATM) we don't print the 
       hardware address if it's null.  */
    if (hw->print != NULL && (! (hw_null_address(hw, ptr->hwaddr) &&
				  hw->suppress_null_addr)))
	printf(_("HWaddr %s  "), hw->print(ptr->hwaddr));
#ifdef IFF_PORTSEL
    if (ptr->flags & IFF_PORTSEL) {
	printf(_("Media:%s"), if_port_text[ptr->map.port][0]);
	if (ptr->flags & IFF_AUTOMEDIA)
	    printf(_("(auto)"));
    }
#endif
    printf("\n");

#if HAVE_AFINET
    if (ptr->has_ip) {
	printf(_("          %s addr:%s "), ap->name,
	       ap->sprint(&ptr->addr, 1));
	if (ptr->flags & IFF_POINTOPOINT) {
	    printf(_(" P-t-P:%s "), ap->sprint(&ptr->dstaddr, 1));
	}
	if (ptr->flags & IFF_BROADCAST) {
	    printf(_(" Bcast:%s "), ap->sprint(&ptr->broadaddr, 1));
	}
	printf(_(" Mask:%s\n"), ap->sprint(&ptr->netmask, 1));
    }
#endif

#if HAVE_AFINET6
    /* FIXME: should be integrated into interface.c.   */

    if ((f = fopen(_PATH_PROCNET_IFINET6, "r")) != NULL) {
	while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n",
		      addr6p[0], addr6p[1], addr6p[2], addr6p[3],
		      addr6p[4], addr6p[5], addr6p[6], addr6p[7],
		  &if_idx, &plen, &scope, &dad_status, devname) != EOF) {
	    if (!strcmp(devname, ptr->name)) {
		sprintf(addr6, "%s:%s:%s:%s:%s:%s:%s:%s",
			addr6p[0], addr6p[1], addr6p[2], addr6p[3],
			addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
		inet6_aftype.input(1, addr6, (struct sockaddr *) &sap);
		printf(_("          inet6 addr: %s/%d"),
		 inet6_aftype.sprint((struct sockaddr *) &sap, 1), plen);
		printf(_(" Scope:"));
		switch (scope) {
		case 0:
		    printf(_("Global"));
		    break;
		case IPV6_ADDR_LINKLOCAL:
		    printf(_("Link"));
		    break;
		case IPV6_ADDR_SITELOCAL:
		    printf(_("Site"));
		    break;
		case IPV6_ADDR_COMPATv4:
		    printf(_("Compat"));
		    break;
		case IPV6_ADDR_LOOPBACK:
		    printf(_("Host"));
		    break;
		default:
		    printf(_("Unknown"));
		}
		printf("\n");
	    }
	}
	fclose(f);
    }
#endif

#if HAVE_AFIPX
    if (ipxtype == NULL)
	ipxtype = get_afntype(AF_IPX);

    if (ipxtype != NULL) {
	if (ptr->has_ipx_bb)
	    printf(_("          IPX/Ethernet II addr:%s\n"),
		   ipxtype->sprint(&ptr->ipxaddr_bb, 1));
	if (ptr->has_ipx_sn)
	    printf(_("          IPX/Ethernet SNAP addr:%s\n"),
		   ipxtype->sprint(&ptr->ipxaddr_sn, 1));
	if (ptr->has_ipx_e2)
	    printf(_("          IPX/Ethernet 802.2 addr:%s\n"),
		   ipxtype->sprint(&ptr->ipxaddr_e2, 1));
	if (ptr->has_ipx_e3)
	    printf(_("          IPX/Ethernet 802.3 addr:%s\n"),
		   ipxtype->sprint(&ptr->ipxaddr_e3, 1));
    }
#endif

#if HAVE_AFATALK
    if (ddptype == NULL)
	ddptype = get_afntype(AF_APPLETALK);
    if (ddptype != NULL) {
	if (ptr->has_ddp)
	    printf(_("          EtherTalk Phase 2 addr:%s\n"), ddptype->sprint(&ptr->ddpaddr, 1));
    }
#endif

#if HAVE_AFECONET
    if (ectype == NULL)
	ectype = get_afntype(AF_ECONET);
    if (ectype != NULL) {
	if (ptr->has_econet)
	    printf(_("          econet addr:%s\n"), ectype->sprint(&ptr->ecaddr, 1));
    }
#endif

    printf("          ");
    /* DONT FORGET TO ADD THE FLAGS IN ife_print_short, too */
    if (ptr->flags == 0)
	printf(_("[NO FLAGS] "));
    if (ptr->flags & IFF_UP)
	printf(_("UP "));
    if (ptr->flags & IFF_BROADCAST)
	printf(_("BROADCAST "));
    if (ptr->flags & IFF_DEBUG)
	printf(_("DEBUG "));
    if (ptr->flags & IFF_LOOPBACK)
	printf(_("LOOPBACK "));
    if (ptr->flags & IFF_POINTOPOINT)
	printf(_("POINTOPOINT "));
    if (ptr->flags & IFF_NOTRAILERS)
	printf(_("NOTRAILERS "));
    if (ptr->flags & IFF_RUNNING)
	printf(_("RUNNING "));
    if (ptr->flags & IFF_NOARP)
	printf(_("NOARP "));
    if (ptr->flags & IFF_PROMISC)
	printf(_("PROMISC "));
    if (ptr->flags & IFF_ALLMULTI)
	printf(_("ALLMULTI "));
    if (ptr->flags & IFF_SLAVE)
	printf(_("SLAVE "));
    if (ptr->flags & IFF_MASTER)
	printf(_("MASTER "));
    if (ptr->flags & IFF_MULTICAST)
	printf(_("MULTICAST "));
#ifdef HAVE_DYNAMIC
    if (ptr->flags & IFF_DYNAMIC)
	printf(_("DYNAMIC "));
#endif
    /* DONT FORGET TO ADD THE FLAGS IN ife_print_short */
    printf(_(" MTU:%d  Metric:%d"),
	   ptr->mtu, ptr->metric ? ptr->metric : 1);
#ifdef SIOCSKEEPALIVE
    if (ptr->outfill || ptr->keepalive)
	printf(_("  Outfill:%d  Keepalive:%d"),
	       ptr->outfill, ptr->keepalive);
#endif
    printf("\n");

    /* If needed, display the interface statistics. */

    if (ptr->statistics_valid) {
	/* XXX: statistics are currently only printed for the primary address,
	 *      not for the aliases, although strictly speaking they're shared
	 *      by all addresses.
	 */
	printf("          ");

	printf(_("RX packets:%Lu errors:%lu dropped:%lu overruns:%lu frame:%lu\n"),
	       ptr->stats.rx_packets, ptr->stats.rx_errors,
	       ptr->stats.rx_dropped, ptr->stats.rx_fifo_errors,
	       ptr->stats.rx_frame_errors);
	if (can_compress)
	    printf(_("             compressed:%lu\n"), ptr->stats.rx_compressed);
	printf("          ");
	printf(_("TX packets:%Lu errors:%lu dropped:%lu overruns:%lu carrier:%lu\n"),
	       ptr->stats.tx_packets, ptr->stats.tx_errors,
	       ptr->stats.tx_dropped, ptr->stats.tx_fifo_errors,
	       ptr->stats.tx_carrier_errors);
	printf(_("          collisions:%lu "), ptr->stats.collisions);
	if (can_compress)
	    printf(_("compressed:%lu "), ptr->stats.tx_compressed);
	if (ptr->tx_queue_len != -1)
	    printf(_("txqueuelen:%d "), ptr->tx_queue_len);
	printf("\n          R");
	print_bytes_scaled(ptr->stats.rx_bytes, "  T");
	print_bytes_scaled(ptr->stats.tx_bytes, "\n");

    }

    if ((ptr->map.irq || ptr->map.mem_start || ptr->map.dma ||
	 ptr->map.base_addr)) {
	printf("          ");
	if (ptr->map.irq)
	    printf(_("Interrupt:%d "), ptr->map.irq);
	if (ptr->map.base_addr >= 0x100)	/* Only print devices using it for 
						   I/O maps */
	    printf(_("Base address:0x%lx "), (unsigned long)ptr->map.base_addr);
	if (ptr->map.mem_start) {
	    printf(_("Memory:%lx-%lx "), ptr->map.mem_start, ptr->map.mem_end);
	}
	if (ptr->map.dma)
	    printf(_("DMA chan:%x "), ptr->map.dma);
	printf("\n");
    }
    printf("\n");
}


static int do_if_print(struct interface *ife, void *cookie)
{
    int *opt_a = (int *) cookie;
    int res; 

    res = do_if_fetch(ife); 
    if (res >= 0) {   
	if ((ife->flags & IFF_UP) || *opt_a)
	    ife_print(ife);
    }
    return res;
}

static struct interface *lookup_interface(char *name)
{
    struct interface *ife = NULL;

    if (if_readlist_proc(name) < 0) 
	    return NULL; 
    ife = add_interface(name); 
    return ife;
}

/* for ipv4 add/del modes */
static int if_print(char *ifname)
{
    int res;

    if (!ifname) {
	res = for_all_interfaces(do_if_print, &interface_opt_a);
    } else {
	struct interface *ife;

	ife = lookup_interface(ifname);
	res = do_if_fetch(ife); 
	if (res >= 0) 
	    ife_print(ife);
    }
    return res; 
}

int display_interfaces(char *ifname)
{
    int status;

    /* Create a channel to the NET kernel. */
    if ((skfd = sockets_open(0)) < 0) {
		perror_msg_and_die("socket");
    }

    /* Do we have to show the current setup? */
    status = if_print(ifname);
    close(skfd);
    exit(status < 0);
}