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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/os/hostaddr.c - Return list of krb5 addresses for a hostname */
/*
* Copyright 1990,1991,2008 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.
*/
#include "k5-int.h"
#include "os-proto.h"
#include "fake-addrinfo.h"
krb5_error_code
k5_os_hostaddr(krb5_context context, const char *name,
krb5_address ***ret_addrs)
{
krb5_error_code retval;
krb5_address **addrs;
int i, j, r;
struct addrinfo hints, *ai, *aip;
if (!name)
return KRB5_ERR_BAD_HOSTNAME;
memset (&hints, 0, sizeof (hints));
hints.ai_flags = AI_NUMERICHOST | AI_ADDRCONFIG;
/* We don't care what kind at this point, really, but without
this, we can get back multiple sockaddrs per address, for
SOCK_DGRAM, SOCK_STREAM, and SOCK_RAW. I haven't checked if
that's what the spec indicates. */
hints.ai_socktype = SOCK_DGRAM;
r = getaddrinfo (name, 0, &hints, &ai);
if (r && AI_NUMERICHOST != 0) {
hints.ai_flags &= ~AI_NUMERICHOST;
r = getaddrinfo (name, 0, &hints, &ai);
}
if (r)
return KRB5_ERR_BAD_HOSTNAME;
for (i = 0, aip = ai; aip; aip = aip->ai_next) {
switch (aip->ai_addr->sa_family) {
case AF_INET:
case AF_INET6:
i++;
default:
/* Ignore addresses of unknown families. */
;
}
}
addrs = malloc ((i+1) * sizeof(*addrs));
if (!addrs)
return ENOMEM;
for (j = 0; j < i + 1; j++)
addrs[j] = 0;
for (i = 0, aip = ai; aip; aip = aip->ai_next) {
void *ptr;
size_t addrlen;
int atype;
switch (aip->ai_addr->sa_family) {
case AF_INET:
addrlen = sizeof (struct in_addr);
ptr = &((struct sockaddr_in *)aip->ai_addr)->sin_addr;
atype = ADDRTYPE_INET;
break;
case AF_INET6:
addrlen = sizeof (struct in6_addr);
ptr = &((struct sockaddr_in6 *)aip->ai_addr)->sin6_addr;
atype = ADDRTYPE_INET6;
break;
default:
continue;
}
addrs[i] = (krb5_address *) malloc(sizeof(krb5_address));
if (!addrs[i]) {
retval = ENOMEM;
goto errout;
}
addrs[i]->magic = KV5M_ADDRESS;
addrs[i]->addrtype = atype;
addrs[i]->length = addrlen;
addrs[i]->contents = k5memdup(ptr, addrlen, &retval);
if (addrs[i]->contents == NULL)
goto errout;
i++;
}
*ret_addrs = addrs;
if (ai)
freeaddrinfo(ai);
return 0;
errout:
if (addrs) {
for (i = 0; addrs[i]; i++) {
free (addrs[i]->contents);
free (addrs[i]);
}
krb5_free_addresses(context, addrs);
}
if (ai)
freeaddrinfo(ai);
return retval;
}
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