/*      $NetBSD: eui64.c,v 1.3 2010/07/31 07:05:32 cegger Exp $ */
/*
* Copyright 2004 The Aerospace Corporation.  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.  The name of The Aerospace Corporation may not be used to endorse or
*     promote products derived from this software.
*
* THIS SOFTWARE IS PROVIDED BY THE AEROSPACE CORPORATION "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 AEROSPACE CORPORATION 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.
*
* Copyright (c) 1995
*      Bill Paul <[email protected]>.  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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by Bill Paul.
* 4. Neither the name of the author nor the names of any co-contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul 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.
*
* EUI-64 conversion and lookup routines
*
*
* Converted from ether_addr.c rev
* FreeBSD: src/lib/libc/net/eui64.c,v 1.15 2002/04/08 07:51:10 ru Exp
* by Brooks Davis
*
* Written by Bill Paul <[email protected]>
* Center for Telecommunications Research
* Columbia University, New York City
*/

#include <sys/cdefs.h>
#if defined(__FreeBSD__)
__FBSDID("$FreeBSD: src/lib/libc/net/eui64.c,v 1.2 2004/06/01 19:30:13 brooks Exp $");
#endif

#include <stdio.h>
#include <paths.h>
#include <sys/types.h>
#if defined(__FreeBSD__)
#include <sys/eui64.h>
#elif defined(__NetBSD__)
#include "eui64.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <sys/param.h>
#ifdef YP
#include <rpc/rpc.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#endif

#ifndef _PATH_EUI64
#define _PATH_EUI64 "/etc/eui64"
#endif

static int eui64_line(const char *l, struct eui64 *e, char *hostname,
   size_t len);

/*
* Parse a string of text containing an EUI-64 and hostname
* and separate it into its component parts.
*/
static int
eui64_line(const char *l, struct eui64 *e, char *hostname, size_t len)
{
       char *line, *linehead, *cur;

       linehead = strdup(l);
       if (linehead == NULL)
               return -1;
       line = linehead;

       /* Find and parse the EUI64 */
       while ((cur = strsep(&line, " \t\r\n")) != NULL) {
               if (*cur != '\0') {
                       if (eui64_aton(cur, e) == 0)
                               break;
                       else
                               goto bad;
               }
       }

       /* Find the hostname */
       while ((cur = strsep(&line, " \t\r\n")) != NULL) {
               if (*cur != '\0') {
                       if (strlcpy(hostname, cur, len) <= len)
                               break;
                       else
                               goto bad;
               }
       }

       /* Make sure what remains is either whitespace or a comment */
       while ((cur = strsep(&line, " \t\r\n")) != NULL) {
               if (*cur == '#')
                       break;
               if (*cur != '\0')
                       goto bad;
       }

       return 0;

bad:
       free(linehead);
       return -1;
}

/*
* Convert an ASCII representation of an EUI-64 to binary form.
*/
int
eui64_aton(const char *a, struct eui64 *e)
{
       int i;
       unsigned int o0, o1, o2, o3, o4, o5, o6, o7;

       /* canonical form */
       i = sscanf(a, "%x-%x-%x-%x-%x-%x-%x-%x",
           &o0, &o1, &o2, &o3, &o4, &o5, &o6, &o7);
       if (i == EUI64_LEN)
               goto good;
       /* ethernet form */
       i = sscanf(a, "%x:%x:%x:%x:%x:%x:%x:%x",
           &o0, &o1, &o2, &o3, &o4, &o5, &o6, &o7);
       if (i == EUI64_LEN)
               goto good;
       /* classic fwcontrol/dconschat form */
       i = sscanf(a, "0x%2x%2x%2x%2x%2x%2x%2x%2x",
           &o0, &o1, &o2, &o3, &o4, &o5, &o6, &o7);
       if (i == EUI64_LEN)
               goto good;
       /* MAC format (-) */
       i = sscanf(a, "%x-%x-%x-%x-%x-%x",
           &o0, &o1, &o2, &o5, &o6, &o7);
       if (i == 6) {
               o3 = 0xff;
               o4 = 0xfe;
               goto good;
       }
       /* MAC format (:) */
       i = sscanf(a, "%x:%x:%x:%x:%x:%x",
           &o0, &o1, &o2, &o5, &o6, &o7);
       if (i == 6) {
               o3 = 0xff;
               o4 = 0xfe;
               goto good;
       }

       return -1;

good:
       e->octet[0]=o0;
       e->octet[1]=o1;
       e->octet[2]=o2;
       e->octet[3]=o3;
       e->octet[4]=o4;
       e->octet[5]=o5;
       e->octet[6]=o6;
       e->octet[7]=o7;

       return 0;
}

/*
* Convert a binary representation of an EUI-64 to an ASCII string.
*/
int
eui64_ntoa(const struct eui64 *id, char *a, size_t len)
{
       int i;

       i = snprintf(a, len, "%02x-%02x-%02x-%02x-%02x-%02x-%02x-%02x",
           id->octet[0], id->octet[1], id->octet[2], id->octet[3],
           id->octet[4], id->octet[5], id->octet[6], id->octet[7]);
       if (i < 23 || i >= (int)len)
               return -1;
       return 0;
}

/*
* Map an EUI-64 to a hostname. Use either /etc/eui64 or NIS/YP.
*/
int
eui64_ntohost(char *hostname, size_t len, const struct eui64 *id)
{
       FILE *fp;
       char buf[BUFSIZ + 2];
       struct eui64 local_eui64;
       char local_host[MAXHOSTNAMELEN];
#ifdef YP
       char *result;
       int resultlen;
       char eui64_a[24];
       char *yp_domain;
#endif
       if ((fp = fopen(_PATH_EUI64, "r")) == NULL)
               return 1;

       while (fgets(buf,BUFSIZ,fp)) {
               if (buf[0] == '#')
                       continue;
#ifdef YP
               if (buf[0] == '+') {
                       if (yp_get_default_domain(&yp_domain))
                               continue;
                       eui64_ntoa(id, eui64_a, sizeof(eui64_a));
                       if (yp_match(yp_domain, "eui64.byid", eui64_a,
                               strlen(eui64_a), &result, &resultlen)) {
                               continue;
                       }
                       strncpy(buf, result, resultlen);
                       buf[resultlen] = '\0';
                       free(result);
               }
#endif
               if (eui64_line(buf, &local_eui64, local_host,
                   sizeof(local_host)) == 0) {
                       if (bcmp(&local_eui64.octet[0],
                               &id->octet[0], EUI64_LEN) == 0) {
                       /* We have a match */
                               strcpy(hostname, local_host);
                               fclose(fp);
                               return 0;
                       }
               }
       }
       fclose(fp);
       return 1;
}

/*
* Map a hostname to an EUI-64 using /etc/eui64 or NIS/YP.
*/
int
eui64_hostton(const char *hostname, struct eui64 *id)
{
       FILE *fp;
       char buf[BUFSIZ + 2];
       struct eui64 local_eui64;
       char local_host[MAXHOSTNAMELEN];
#ifdef YP
       char *result;
       int resultlen;
       char *yp_domain;
#endif
       if ((fp = fopen(_PATH_EUI64, "r")) == NULL)
               return 1;

       while (fgets(buf,BUFSIZ,fp)) {
               if (buf[0] == '#')
                       continue;
#ifdef YP
               if (buf[0] == '+') {
                       if (yp_get_default_domain(&yp_domain))
                               continue;
                       if (yp_match(yp_domain, "eui64.byname", hostname,
                               strlen(hostname), &result, &resultlen)) {
                               continue;
                       }
                       strncpy(buf, result, resultlen);
                       buf[resultlen] = '\0';
                       free(result);
               }
#endif
               if (eui64_line(buf, &local_eui64, local_host,
                   sizeof(local_host)) == 0) {
                       if (strcmp(hostname, local_host) == 0) {
                               /* We have a match */
                               bcopy(&local_eui64, id, sizeof(struct eui64));
                               fclose(fp);
                               return 0;
                       }
               }
       }
       fclose(fp);
       return 1;
}

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