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ether.c

/*
 * lib/ether.c        This file contains an implementation of the "Ethernet"
 *              support functions.
 *
 * Version:     $Id: ether.c,v 1.8 2002/07/30 05:17:29 ecki Exp $
 *
 * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
 *              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.
 */
#include "config.h"

#if HAVE_HWETHER
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if_arp.h>
#include <linux/if_ether.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include "net-support.h"
#include "pathnames.h"
#include "intl.h"
#include "util.h"

extern 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);
}


/* 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);
}


struct hwtype ether_hwtype =
{
    "ether", NULL, /*"10Mbps Ethernet", */ ARPHRD_ETHER, ETH_ALEN,
    pr_ether, in_ether, NULL
};


#endif                        /* HAVE_HWETHER */

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