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/* $OpenBSD: krb_equiv.c,v 1.4 1997/12/09 07:57:24 art Exp $ */
/* $KTH: krb_equiv.c,v 1.13 1997/04/01 08:18:33 joda Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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 the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*/
/*
* int krb_equiv(u_int32_t ipaddr_a, u_int32_t ipaddr_b);
*
* Given two IP adresses return true if they match
* or are considered to belong to the same host.
*
* For example if /etc/krb.equiv looks like
*
* 130.237.223.3 192.16.126.3 # alv alv1
* 130.237.223.4 192.16.126.4 # byse byse1
* 130.237.228.152 192.16.126.9 # topsy topsy1
*
* krb_equiv(alv, alv1) would return true but
* krb_equiv(alv, byse1) would not.
*
* A comment starts with an '#' and ends with '\n'.
*
*/
#include "krb_locl.h"
int krb_ignore_ip_address = 0;
int
krb_equiv(u_int32_t a, u_int32_t b)
{
FILE *fil;
char line[256];
int hit_a, hit_b;
int iscomment;
if (a == b) /* trivial match, also the common case */
return 1;
if (krb_ignore_ip_address)
return 1; /* if we have decided not to compare */
a = ntohl(a);
b = ntohl(b);
fil = fopen(KRB_EQUIV, "r");
if (fil == NULL) /* open failed */
return 0;
hit_a = hit_b = 0;
iscomment = 0;
while (fgets(line, sizeof(line)-1, fil) != NULL) /* for each line */
{
char *t = line;
int len = strlen(t);
/* for each item on this line */
while (*t != 0) /* more addresses on this line? */
if (*t == '\n') {
iscomment = hit_a = hit_b = 0;
break;
} else if (iscomment)
t = line + len - 1;
else if (*t == '#') { /* rest is comment */
iscomment = 1;
++t;
} else if (*t == '\\' ) /* continuation */
break;
else if (isspace(*t)) /* skip space */
t++;
else if (isdigit(*t)) /* an address? */
{
u_int32_t tmp;
u_int32_t tmpa, tmpb, tmpc, tmpd;
sscanf(t, "%d.%d.%d.%d", &tmpa, &tmpb, &tmpc, &tmpd);
tmp = (tmpa << 24) | (tmpb << 16) | (tmpc << 8) | tmpd;
while (*t == '.' || isdigit(*t)) /* done with this address */
t++;
if (tmp != -1) { /* an address (and not broadcast) */
u_int32_t mask = (u_int32_t)~0;
if (*t == '/') {
++t;
mask <<= 32 - atoi(t);
while(isdigit(*t))
++t;
}
if ((tmp & mask) == (a & mask))
hit_a = 1;
if ((tmp & mask) == (b & mask))
hit_b = 1;
if (hit_a && hit_b) {
fclose(fil);
return 1;
}
}
}
else
++t; /* garbage on this line, skip it */
}
fclose(fil);
return 0;
}
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