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/*
* 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_equiv(a, b)
u_int32_t a;
u_int32_t b;
{
#ifdef NO_IPADDR_CHECK
return 1;
#else
FILE *fil;
int result = 0;
char line[256];
if (a == b) /* trivial match */
return 1;
fil = fopen(KRB_EQUIV, "r");
if (fil == NULL) /* open failed */
return 0;
while (fgets(line, sizeof(line)-1, fil) != NULL) /* for each line */
{
int hit_a = 0, hit_b = 0;
char *t = line;
/* for each item on this line */
while (*t != 0) /* more addresses on this line? */
if (*t == '#') /* rest is comment */
*t = 0;
else if (isspace(*t)) /* skip space */
t++;
else if (isdigit(*t)) /* an address? */
{
u_int32_t tmp = inet_addr(t);
if (tmp == -1)
; /* not an address (or broadcast) */
else if (tmp == a)
hit_a = 1;
else if (tmp == b)
hit_b = 1;
while (*t == '.' || isdigit(*t)) /* done with this address */
t++;
}
else
*t = 0; /* garbage on this line, skip it */
/* line is now parsed, if we found 2 matches were done */
if (hit_a && hit_b)
{
result = 1;
goto done;
}
}
done:
fclose(fil);
return result;
#endif /* !NO_IPADDR_CHECK */
}
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