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/*
* lib/krb5/os/locate_kdc.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* get socket addresses for KDC.
*/
#define NEED_SOCKETS
#include "k5-int.h"
#include <stdio.h>
/*
* returns count of number of addresses found
*/
krb5_error_code
krb5_locate_kdc(context, realm, addr_pp, naddrs)
krb5_context context;
const krb5_data *realm;
struct sockaddr **addr_pp;
int *naddrs;
{
const char *realm_kdc_names[4];
char **hostlist, *host, *port, *cp;
krb5_error_code code;
int i, j, out, count;
struct sockaddr *addr_p;
struct sockaddr_in *sin_p;
struct hostent *hp;
struct servent *sp;
#ifdef KRB5_USE_INET
u_short udpport = htons(KRB5_DEFAULT_PORT);
u_short sec_udpport = htons(KRB5_DEFAULT_SEC_PORT);
#endif
if ((host = malloc(realm->length + 1)) == NULL)
return ENOMEM;
strncpy(host, realm->data, realm->length);
host[realm->length] = '\0';
hostlist = 0;
realm_kdc_names[0] = "realms";
realm_kdc_names[1] = host;
realm_kdc_names[2] = "kdc";
realm_kdc_names[3] = 0;
code = profile_get_values(context->profile, realm_kdc_names, &hostlist);
krb5_xfree(host);
if (code == PROF_NO_SECTION)
return KRB5_REALM_UNKNOWN;
if (code == PROF_NO_RELATION)
return KRB5_CONFIG_BADFORMAT;
if (code)
return code;
#ifdef KRB5_USE_INET
if ((sp = getservbyname(KDC_PORTNAME, "udp")))
udpport = sp->s_port;
if ((sp = getservbyname(KDC_SECONDARY_PORTNAME, "udp")))
sec_udpport = sp->s_port;
#endif
if (sec_udpport == udpport)
sec_udpport = 0;
count = 0;
while (hostlist && hostlist[count])
count++;
if (count == 0) {
*naddrs = 0;
return 0;
}
#ifdef KRB5_USE_INET
if (sec_udpport)
count = count * 2;
#endif
addr_p = (struct sockaddr *)malloc (sizeof (struct sockaddr) * count);
for (i=0, out=0; hostlist[i]; i++) {
host = hostlist[i];
/*
* Strip off excess whitespace
*/
cp = strchr(host, ' ');
if (cp)
*cp = 0;
cp = strchr(host, '\t');
if (cp)
*cp = 0;
port = strchr(host, ':');
if (port) {
*port = 0;
port++;
}
hp = gethostbyname(hostlist[i]);
if (hp != 0) {
switch (hp->h_addrtype) {
#ifdef KRB5_USE_INET
case AF_INET:
for (j=0; hp->h_addr_list[j]; j++) {
sin_p = (struct sockaddr_in *) &addr_p[out++];
memset ((char *)sin_p, 0, sizeof(struct sockaddr));
sin_p->sin_family = hp->h_addrtype;
sin_p->sin_port = port ? htons(atoi(port)) : udpport;
memcpy((char *)&sin_p->sin_addr,
(char *)hp->h_addr_list[j],
sizeof(struct in_addr));
if (out+1 >= count) {
count += 5;
addr_p = (struct sockaddr *)
realloc ((char *)addr_p,
sizeof(struct sockaddr) * count);
}
if (sec_udpport && !port) {
addr_p[out] = addr_p[out-1];
sin_p = (struct sockaddr_in *) &addr_p[out++];
sin_p->sin_port = sec_udpport;
}
}
break;
#endif
default:
break;
}
}
free(hostlist[i]);
hostlist[i] = 0;
}
free ((char *)hostlist);
if (out == 0) { /* Couldn't resolve any KDC names */
free (addr_p);
return KRB5_REALM_CANT_RESOLVE;
}
*addr_pp = addr_p;
*naddrs = out;
return 0;
}
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