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/*
* $Source$
* $Author$
*
* Copyright 1990 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
* krb5_walk_realm_tree()
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_walk_rtree_c[] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/copyright.h>
#include <krb5/krb5.h>
#include <krb5/ext-proto.h>
#include "int-proto.h"
/* internal function, used by krb5_get_cred_from_kdc() */
#define REALM_BRANCH_CHAR '.'
#ifndef min
#define min(x,y) ((x) < (y) ? (x) : (y))
#define max(x,y) ((x) > (y) ? (x) : (y))
#endif
krb5_error_code
krb5_walk_realm_tree(client, server, tree)
krb5_const_principal client, server;
krb5_principal **tree;
{
krb5_error_code retval;
krb5_principal *rettree;
register char *ccp, *scp;
register char *prevccp, *prevscp;
char *com_sdot = 0, *com_cdot = 0;
register int i, links = 0;
int clen, slen;
krb5_data tmpcrealm, tmpsrealm;
int nocommon = 1;
clen = krb5_princ_realm(client)->length;
slen = krb5_princ_realm(server)->length;
for (com_cdot = ccp = krb5_princ_realm(client)->data + clen - 1,
com_sdot = scp = krb5_princ_realm(server)->data + slen - 1;
clen && slen && *ccp == *scp ;
ccp--, scp--, clen--, slen--) {
if (*ccp == REALM_BRANCH_CHAR) {
com_cdot = ccp;
com_sdot = scp;
nocommon = 0;
}
}
/* ccp, scp point to common root.
com_cdot, com_sdot point to common components. */
/* handle case of one ran out */
if (!clen) {
/* construct path from client to server, down the tree */
if (!slen)
/* in the same realm--this means there is no ticket
in this realm. */
return KRB5_NO_TKT_IN_RLM;
if (*scp == REALM_BRANCH_CHAR) {
/* one is a subdomain of the other */
com_cdot = krb5_princ_realm(client)->data;
com_sdot = scp;
} /* else normal case of two sharing parents */
}
if (!slen) {
/* construct path from client to server, up the tree */
if (*ccp == REALM_BRANCH_CHAR) {
/* one is a subdomain of the other */
com_sdot = krb5_princ_realm(server)->data;
com_cdot = ccp;
} /* else normal case of two sharing parents */
}
/* determine #links to/from common ancestor */
if (nocommon)
links = 1;
else
links = 2;
/* if no common ancestor, artificially set up common root at the last
component, then join with special code */
for (ccp = krb5_princ_realm(client)->data; ccp < com_cdot; ccp++) {
if (*ccp == REALM_BRANCH_CHAR) {
links++;
if (nocommon)
com_cdot = prevccp = ccp;
}
}
for (scp = krb5_princ_realm(server)->data; scp < com_sdot; scp++) {
if (*scp == REALM_BRANCH_CHAR) {
links++;
if (nocommon)
com_sdot = prevscp = scp;
}
}
if (nocommon && links == 3) {
/* no components, and not the same */
com_cdot = krb5_princ_realm(client)->data;
com_sdot = krb5_princ_realm(server)->data;
}
if (!(rettree = (krb5_principal *)calloc(links+2,
sizeof(krb5_principal)))) {
return ENOMEM;
}
i = 1;
if (retval = krb5_tgtname(krb5_princ_realm(client),
krb5_princ_realm(client), &rettree[0])) {
xfree(rettree);
return retval;
}
for (prevccp = ccp = krb5_princ_realm(client)->data;
ccp <= com_cdot;
ccp++) {
if (*ccp != REALM_BRANCH_CHAR)
continue;
++ccp; /* advance past dot */
tmpcrealm.data = prevccp;
tmpcrealm.length = krb5_princ_realm(client)->length -
(prevccp - krb5_princ_realm(client)->data);
tmpsrealm.data = ccp;
tmpsrealm.length = krb5_princ_realm(client)->length -
(ccp - krb5_princ_realm(client)->data);
if (retval = krb5_tgtname(&tmpsrealm, &tmpcrealm, &rettree[i])) {
while (i) {
krb5_free_principal(rettree[i-1]);
i--;
}
xfree(rettree);
return retval;
}
prevccp = ccp;
i++;
}
if (nocommon) {
tmpcrealm.data = com_cdot + 1;
tmpcrealm.length = krb5_princ_realm(client)->length -
(com_cdot + 1 - krb5_princ_realm(client)->data);
tmpsrealm.data = com_sdot + 1;
tmpsrealm.length = krb5_princ_realm(server)->length -
(com_sdot + 1 - krb5_princ_realm(server)->data);
if (retval = krb5_tgtname(&tmpsrealm, &tmpcrealm, &rettree[i])) {
while (i) {
krb5_free_principal(rettree[i-1]);
i--;
}
xfree(rettree);
return retval;
}
i++;
}
for (prevscp = com_sdot + 1, scp = com_sdot - 1;
scp > krb5_princ_realm(server)->data;
scp--) {
if (*scp != REALM_BRANCH_CHAR)
continue;
if (scp - 1 < krb5_princ_realm(server)->data)
break; /* XXX only if . starts realm? */
tmpcrealm.data = prevscp;
tmpcrealm.length = krb5_princ_realm(server)->length -
(prevscp - krb5_princ_realm(server)->data);
tmpsrealm.data = scp + 1;
tmpsrealm.length = krb5_princ_realm(server)->length -
(scp + 1 - krb5_princ_realm(server)->data);
if (retval = krb5_tgtname(&tmpsrealm, &tmpcrealm, &rettree[i])) {
while (i) {
krb5_free_principal(rettree[i-1]);
i--;
}
xfree(rettree);
return retval;
}
prevscp = scp + 1;
i++;
}
if (slen) {
/* only necessary if building down tree from ancestor or client */
tmpcrealm.data = prevscp;
tmpcrealm.length = krb5_princ_realm(server)->length -
(prevscp - krb5_princ_realm(server)->data);
if (retval = krb5_tgtname(krb5_princ_realm(server), &tmpcrealm,
&rettree[i])) {
while (i) {
krb5_free_principal(rettree[i-1]);
i--;
}
xfree(rettree);
return retval;
}
}
*tree = rettree;
return 0;
}
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