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/*
* Copyright 1990,1991,1997 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.
*
* Send a packet to a service and await a reply, using an exponential
* backoff retry algorithm. This is based on krb5_sendto_kdc.
*/
/* Grab socket stuff. This might want to go away later. */
#define NEED_SOCKETS
#define NEED_LOWLEVEL_IO
#include "fake-addrinfo.h" /* for custom addrinfo if needed */
#include "k5-int.h"
#ifndef _WIN32
#include <unistd.h>
#include <sys/time.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <krb.h>
#include "krb524.h"
/*
* krb524_sendto_kdc:
*
* A slightly modified version of krb5_sendto_kdc.
*
* send the formatted request 'message' to a KDC for realm 'realm' and
* return the response (if any) in 'reply'.
*
* If the message is sent and a response is received, 0 is returned,
* otherwise an error code is returned.
*
* The storage for 'reply' is allocated and should be freed by the caller
* when finished.
*/
krb5_error_code
krb524_sendto_kdc (context, message, realm, reply, addr, addrlen)
krb5_context context;
const krb5_data * message;
const krb5_data * realm;
krb5_data * reply;
struct sockaddr *addr;
socklen_t *addrlen;
{
int i;
struct addrlist al = ADDRLIST_INIT;
struct servent *serv;
krb5_error_code retval;
krb5int_access internals;
int port;
retval = krb5int_accessor(&internals, KRB5INT_ACCESS_VERSION);
if (retval)
return retval;
/*
* find KDC location(s) for realm
*/
serv = getservbyname(KRB524_SERVICE, "udp");
port = serv ? serv->s_port : htons (KRB524_PORT);
retval = internals.krb5_locate_server(context, realm, &al, 0,
"krb524_server", "_krb524",
SOCK_DGRAM, port,
0, PF_INET);
if (retval == KRB5_REALM_CANT_RESOLVE || retval == KRB5_REALM_UNKNOWN) {
/* Fallback heuristic: Assume krb524 port on every KDC might
work. */
retval = internals.krb5_locate_kdc(context, realm, &al, 0,
SOCK_DGRAM, PF_INET);
/*
* Bash the ports numbers.
*/
if (retval == 0)
for (i = 0; i < al.naddrs; i++) {
al.addrs[i]->ai_socktype = SOCK_DGRAM;
if (al.addrs[i]->ai_family == AF_INET)
sa2sin (al.addrs[i]->ai_addr)->sin_port = port;
}
}
if (retval)
return retval;
if (al.naddrs == 0)
return KRB5_REALM_UNKNOWN;
retval = internals.sendto_udp (context, message, &al, reply, addr,
addrlen);
internals.free_addrlist (&al);
return retval;
}
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