141 lines
4.0 KiB
C
141 lines
4.0 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* int krb_equiv(u_int32_t ipaddr_a, u_int32_t ipaddr_b);
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*
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* Given two IP adresses return true if they match
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* or are considered to belong to the same host.
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*
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* For example if /etc/krb.equiv looks like
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*
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* 130.237.223.3 192.16.126.3 # alv alv1
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* 130.237.223.4 192.16.126.4 # byse byse1
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* 130.237.228.152 192.16.126.9 # topsy topsy1
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*
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* krb_equiv(alv, alv1) would return true but
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* krb_equiv(alv, byse1) would not.
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*
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* A comment starts with an '#' and ends with '\n'.
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*
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*/
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#include "krb_locl.h"
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RCSID("$Id: krb_equiv.c,v 1.15 1999/12/02 16:58:42 joda Exp $");
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int krb_ignore_ip_address = 0;
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int
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krb_equiv(u_int32_t a, u_int32_t b)
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{
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FILE *fil;
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char line[256];
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int hit_a, hit_b;
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int iscomment;
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if (a == b) /* trivial match, also the common case */
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return 1;
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if (krb_ignore_ip_address)
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return 1; /* if we have decided not to compare */
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a = ntohl(a);
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b = ntohl(b);
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fil = fopen(KRB_EQUIV, "r");
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if (fil == NULL) /* open failed */
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return 0;
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hit_a = hit_b = 0;
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iscomment = 0;
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while (fgets(line, sizeof(line)-1, fil) != NULL) /* for each line */
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{
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char *t = line;
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int len = strlen(t);
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/* for each item on this line */
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while (*t != 0) /* more addresses on this line? */
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if (*t == '\n') {
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iscomment = hit_a = hit_b = 0;
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break;
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} else if (iscomment)
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t = line + len - 1;
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else if (*t == '#') { /* rest is comment */
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iscomment = 1;
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++t;
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} else if (*t == '\\' ) /* continuation */
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break;
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else if (isspace((unsigned char)*t)) /* skip space */
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t++;
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else if (isdigit((unsigned char)*t)) /* an address? */
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{
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u_int32_t tmp;
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u_int32_t tmpa, tmpb, tmpc, tmpd;
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sscanf(t, "%d.%d.%d.%d", &tmpa, &tmpb, &tmpc, &tmpd);
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tmp = (tmpa << 24) | (tmpb << 16) | (tmpc << 8) | tmpd;
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/* done with this address */
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while (*t == '.' || isdigit((unsigned char)*t))
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t++;
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if (tmp != -1) { /* an address (and not broadcast) */
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u_int32_t mask = (u_int32_t)~0;
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if (*t == '/') {
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++t;
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mask <<= 32 - atoi(t);
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while(isdigit((unsigned char)*t))
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++t;
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}
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if ((tmp & mask) == (a & mask))
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hit_a = 1;
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if ((tmp & mask) == (b & mask))
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hit_b = 1;
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if (hit_a && hit_b) {
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fclose(fil);
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return 1;
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}
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}
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}
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else
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++t; /* garbage on this line, skip it */
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}
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fclose(fil);
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return 0;
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}
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