/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */

/* kprop/kprop_util.c */

/*

 * Copyright (C) 2010 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.  Furthermore if you modify this software you must label

 * your software as modified software and not distribute it in such a

 * fashion that it might be confused with the original M.I.T. software.

 * 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.

 */

/* sockaddr2krbaddr() utility function used by kprop and kpropd */

#include "k5-int.h"

#include "kprop.h"

#include <sys/types.h>

#include <sys/socket.h>

/*

 * Convert an IPv4 or IPv6 socket address to a newly allocated krb5_address.

 * There is similar code elsewhere in the tree, so this should possibly become

 * a libkrb5 API in the future.

 */

krb5_error_code

sockaddr2krbaddr(krb5_context context, int family, struct sockaddr *sa,

                 krb5_address **dest)

{

    krb5_address addr;

    addr.magic = KV5M_ADDRESS;

    if (family == AF_INET) {

        struct sockaddr_in *sa4 = sa2sin(sa);

        addr.addrtype = ADDRTYPE_INET;

        addr.length = sizeof(sa4->sin_addr);

        addr.contents = (krb5_octet *) &sa4->sin_addr;

    } else if (family == AF_INET6) {

        struct sockaddr_in6 *sa6 = sa2sin6(sa);

        if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {

            addr.addrtype = ADDRTYPE_INET;

            addr.contents = (krb5_octet *) &sa6->sin6_addr + 12;

            addr.length = 4;

        } else {

            addr.addrtype = ADDRTYPE_INET6;

            addr.length = sizeof(sa6->sin6_addr);

            addr.contents = (krb5_octet *) &sa6->sin6_addr;

        }

    } else

        return KRB5_PROG_ATYPE_NOSUPP;

    return krb5_copy_addr(context, &addr, dest);

}

/* Construct a host-based principal, similar to krb5_sname_to_principal() but

 * with a specified realm. */

krb5_error_code

sn2princ_realm(krb5_context context, const char *hostname, const char *sname,

               const char *realm, krb5_principal *princ_out)

{

    krb5_error_code ret;

    char *canonhost, localname[MAXHOSTNAMELEN];

    *princ_out = NULL;

    assert(sname != NULL && realm != NULL);

    /* If hostname is NULL, use the local hostname. */

    if (hostname == NULL) {

        if (gethostname(localname, MAXHOSTNAMELEN) != 0)

            return SOCKET_ERRNO;

        hostname = localname;

    }

    ret = krb5_expand_hostname(context, hostname, &canonhost);

    if (ret)

        return ret;

    ret = krb5_build_principal(context, princ_out, strlen(realm), realm, sname,

                               canonhost, (char *)NULL);

    krb5_free_string(context, canonhost);

    if (!ret)

        (*princ_out)->type = KRB5_NT_SRV_HST;

    return ret;

}