292 lines
8.1 KiB
C
292 lines
8.1 KiB
C
/*
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* Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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RCSID("$Id: get_addrs.c 13863 2004-05-25 21:46:46Z lha $");
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#ifdef __osf__
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/* hate */
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struct rtentry;
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struct mbuf;
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#endif
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#include <ifaddrs.h>
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static krb5_error_code
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gethostname_fallback (krb5_context context, krb5_addresses *res)
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{
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krb5_error_code ret;
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char hostname[MAXHOSTNAMELEN];
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struct hostent *hostent;
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if (gethostname (hostname, sizeof(hostname))) {
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ret = errno;
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krb5_set_error_string (context, "gethostname: %s", strerror(ret));
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return ret;
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}
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hostent = roken_gethostbyname (hostname);
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if (hostent == NULL) {
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ret = errno;
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krb5_set_error_string (context, "gethostbyname %s: %s",
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hostname, strerror(ret));
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return ret;
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}
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res->len = 1;
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res->val = malloc (sizeof(*res->val));
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if (res->val == NULL) {
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krb5_set_error_string(context, "malloc: out of memory");
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return ENOMEM;
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}
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res->val[0].addr_type = hostent->h_addrtype;
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res->val[0].address.data = NULL;
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res->val[0].address.length = 0;
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ret = krb5_data_copy (&res->val[0].address,
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hostent->h_addr,
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hostent->h_length);
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if (ret) {
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free (res->val);
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return ret;
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}
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return 0;
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}
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enum {
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LOOP = 1, /* do include loopback interfaces */
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LOOP_IF_NONE = 2, /* include loopback if no other if's */
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EXTRA_ADDRESSES = 4, /* include extra addresses */
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SCAN_INTERFACES = 8 /* scan interfaces for addresses */
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};
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/*
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* Try to figure out the addresses of all configured interfaces with a
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* lot of magic ioctls.
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*/
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static krb5_error_code
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find_all_addresses (krb5_context context, krb5_addresses *res, int flags)
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{
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struct sockaddr sa_zero;
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struct ifaddrs *ifa0, *ifa;
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krb5_error_code ret = ENXIO;
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int num, idx;
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krb5_addresses ignore_addresses;
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res->val = NULL;
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if (getifaddrs(&ifa0) == -1) {
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ret = errno;
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krb5_set_error_string(context, "getifaddrs: %s", strerror(ret));
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return (ret);
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}
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memset(&sa_zero, 0, sizeof(sa_zero));
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/* First, count all the ifaddrs. */
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for (ifa = ifa0, num = 0; ifa != NULL; ifa = ifa->ifa_next, num++)
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/* nothing */;
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if (num == 0) {
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freeifaddrs(ifa0);
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krb5_set_error_string(context, "no addresses found");
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return (ENXIO);
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}
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if (flags & EXTRA_ADDRESSES) {
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/* we'll remove the addresses we don't care about */
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ret = krb5_get_ignore_addresses(context, &ignore_addresses);
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if(ret)
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return ret;
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}
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/* Allocate storage for them. */
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res->val = calloc(num, sizeof(*res->val));
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if (res->val == NULL) {
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krb5_free_addresses(context, &ignore_addresses);
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freeifaddrs(ifa0);
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krb5_set_error_string (context, "malloc: out of memory");
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return (ENOMEM);
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}
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/* Now traverse the list. */
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for (ifa = ifa0, idx = 0; ifa != NULL; ifa = ifa->ifa_next) {
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if ((ifa->ifa_flags & IFF_UP) == 0)
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continue;
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if (ifa->ifa_addr == NULL)
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continue;
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if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
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continue;
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if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
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continue;
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if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) {
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/* We'll deal with the LOOP_IF_NONE case later. */
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if ((flags & LOOP) == 0)
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continue;
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}
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ret = krb5_sockaddr2address(context, ifa->ifa_addr, &res->val[idx]);
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if (ret) {
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/*
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* The most likely error here is going to be "Program
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* lacks support for address type". This is no big
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* deal -- just continue, and we'll listen on the
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* addresses who's type we *do* support.
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*/
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continue;
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}
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/* possibly skip this address? */
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if((flags & EXTRA_ADDRESSES) &&
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krb5_address_search(context, &res->val[idx], &ignore_addresses)) {
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krb5_free_address(context, &res->val[idx]);
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flags &= ~LOOP_IF_NONE; /* we actually found an address,
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so don't add any loop-back
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addresses */
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continue;
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}
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idx++;
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}
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/*
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* If no addresses were found, and LOOP_IF_NONE is set, then find
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* the loopback addresses and add them to our list.
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*/
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if ((flags & LOOP_IF_NONE) != 0 && idx == 0) {
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for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) {
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if ((ifa->ifa_flags & IFF_UP) == 0)
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continue;
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if (ifa->ifa_addr == NULL)
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continue;
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if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
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continue;
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if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
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continue;
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if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) {
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ret = krb5_sockaddr2address(context,
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ifa->ifa_addr, &res->val[idx]);
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if (ret) {
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/*
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* See comment above.
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*/
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continue;
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}
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if((flags & EXTRA_ADDRESSES) &&
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krb5_address_search(context, &res->val[idx],
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&ignore_addresses)) {
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krb5_free_address(context, &res->val[idx]);
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continue;
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}
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idx++;
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}
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}
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}
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if (flags & EXTRA_ADDRESSES)
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krb5_free_addresses(context, &ignore_addresses);
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freeifaddrs(ifa0);
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if (ret)
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free(res->val);
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else
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res->len = idx; /* Now a count. */
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return (ret);
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}
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static krb5_error_code
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get_addrs_int (krb5_context context, krb5_addresses *res, int flags)
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{
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krb5_error_code ret = -1;
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if (flags & SCAN_INTERFACES) {
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ret = find_all_addresses (context, res, flags);
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if(ret || res->len == 0)
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ret = gethostname_fallback (context, res);
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} else {
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res->len = 0;
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res->val = NULL;
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ret = 0;
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}
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if(ret == 0 && (flags & EXTRA_ADDRESSES)) {
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krb5_addresses a;
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/* append user specified addresses */
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ret = krb5_get_extra_addresses(context, &a);
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if(ret) {
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krb5_free_addresses(context, res);
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return ret;
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}
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ret = krb5_append_addresses(context, res, &a);
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if(ret) {
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krb5_free_addresses(context, res);
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return ret;
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}
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krb5_free_addresses(context, &a);
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}
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if(res->len == 0) {
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free(res->val);
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res->val = NULL;
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}
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return ret;
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}
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/*
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* Try to get all addresses, but return the one corresponding to
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* `hostname' if we fail.
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*
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* Only include loopback address if there are no other.
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*/
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krb5_error_code KRB5_LIB_FUNCTION
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krb5_get_all_client_addrs (krb5_context context, krb5_addresses *res)
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{
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int flags = LOOP_IF_NONE | EXTRA_ADDRESSES;
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if (context->scan_interfaces)
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flags |= SCAN_INTERFACES;
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return get_addrs_int (context, res, flags);
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}
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/*
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* Try to get all local addresses that a server should listen to.
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* If that fails, we return the address corresponding to `hostname'.
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*/
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krb5_error_code KRB5_LIB_FUNCTION
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krb5_get_all_server_addrs (krb5_context context, krb5_addresses *res)
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{
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return get_addrs_int (context, res, LOOP | SCAN_INTERFACES);
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}
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