142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*
|
|
* Copyright (c) 1995, 1996, 1997, 1998, 1999 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. 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"
|
|
|
|
__RCSID("$KTH-KRB: krb_equiv.c,v 1.15 1999/12/02 16:58:42 joda Exp $"
|
|
"$NetBSD: krb_equiv.c,v 1.1.1.3 2002/09/12 12:22:09 joda Exp $");
|
|
|
|
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((unsigned char)*t)) /* skip space */
|
|
t++;
|
|
else if (isdigit((unsigned char)*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;
|
|
|
|
/* done with this address */
|
|
while (*t == '.' || isdigit((unsigned char)*t))
|
|
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((unsigned char)*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;
|
|
}
|