2 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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34 #include "krb5_locl.h"
46 static krb5_error_code
47 gethostname_fallback (krb5_context context, krb5_addresses *res)
50 char hostname[MAXHOSTNAMELEN];
51 struct hostent *hostent;
53 if (gethostname (hostname, sizeof(hostname))) {
55 krb5_set_error_message(context, ret, "gethostname: %s", strerror(ret));
58 hostent = roken_gethostbyname (hostname);
59 if (hostent == NULL) {
61 krb5_set_error_message (context, ret, "gethostbyname %s: %s",
62 hostname, strerror(ret));
66 res->val = malloc (sizeof(*res->val));
67 if (res->val == NULL) {
68 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
71 res->val[0].addr_type = hostent->h_addrtype;
72 res->val[0].address.data = NULL;
73 res->val[0].address.length = 0;
74 ret = krb5_data_copy (&res->val[0].address,
85 LOOP = 1, /* do include loopback addrs */
86 LOOP_IF_NONE = 2, /* include loopback addrs if no others */
87 EXTRA_ADDRESSES = 4, /* include extra addresses */
88 SCAN_INTERFACES = 8 /* scan interfaces for addresses */
92 * Try to figure out the addresses of all configured interfaces with a
93 * lot of magic ioctls.
96 static krb5_error_code
97 find_all_addresses (krb5_context context, krb5_addresses *res, int flags)
99 struct sockaddr sa_zero;
100 struct ifaddrs *ifa0, *ifa;
101 krb5_error_code ret = ENXIO;
102 unsigned int num, idx;
103 krb5_addresses ignore_addresses;
105 if (getifaddrs(&ifa0) == -1) {
107 krb5_set_error_message(context, ret, "getifaddrs: %s", strerror(ret));
111 memset(&sa_zero, 0, sizeof(sa_zero));
113 /* First, count all the ifaddrs. */
114 for (ifa = ifa0, num = 0; ifa != NULL; ifa = ifa->ifa_next, num++)
119 krb5_set_error_message(context, ENXIO, N_("no addresses found", ""));
123 if (flags & EXTRA_ADDRESSES) {
124 /* we'll remove the addresses we don't care about */
125 ret = krb5_get_ignore_addresses(context, &ignore_addresses);
130 /* Allocate storage for them. */
131 res->val = calloc(num, sizeof(*res->val));
132 if (res->val == NULL) {
133 krb5_free_addresses(context, &ignore_addresses);
135 krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
139 /* Now traverse the list. */
140 for (ifa = ifa0, idx = 0; ifa != NULL; ifa = ifa->ifa_next) {
141 if ((ifa->ifa_flags & IFF_UP) == 0)
143 if (ifa->ifa_addr == NULL)
145 if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
147 if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
149 if (krb5_sockaddr_is_loopback(ifa->ifa_addr) && (flags & LOOP) == 0)
150 /* We'll deal with the LOOP_IF_NONE case later. */
153 ret = krb5_sockaddr2address(context, ifa->ifa_addr, &res->val[idx]);
156 * The most likely error here is going to be "Program
157 * lacks support for address type". This is no big
158 * deal -- just continue, and we'll listen on the
159 * addresses who's type we *do* support.
163 /* possibly skip this address? */
164 if((flags & EXTRA_ADDRESSES) &&
165 krb5_address_search(context, &res->val[idx], &ignore_addresses)) {
166 krb5_free_address(context, &res->val[idx]);
167 flags &= ~LOOP_IF_NONE; /* we actually found an address,
168 so don't add any loop-back
177 * If no addresses were found, and LOOP_IF_NONE is set, then find
178 * the loopback addresses and add them to our list.
180 if ((flags & LOOP_IF_NONE) != 0 && idx == 0) {
181 for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) {
182 if ((ifa->ifa_flags & IFF_UP) == 0)
184 if (ifa->ifa_addr == NULL)
186 if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
188 if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
190 if (!krb5_sockaddr_is_loopback(ifa->ifa_addr))
192 if ((ifa->ifa_flags & IFF_LOOPBACK) == 0)
193 /* Presumably loopback addrs are only used on loopback ifs! */
195 ret = krb5_sockaddr2address(context,
196 ifa->ifa_addr, &res->val[idx]);
198 continue; /* We don't consider this failure fatal */
199 if((flags & EXTRA_ADDRESSES) &&
200 krb5_address_search(context, &res->val[idx],
201 &ignore_addresses)) {
202 krb5_free_address(context, &res->val[idx]);
209 if (flags & EXTRA_ADDRESSES)
210 krb5_free_addresses(context, &ignore_addresses);
216 res->len = idx; /* Now a count. */
220 static krb5_error_code
221 get_addrs_int (krb5_context context, krb5_addresses *res, int flags)
223 krb5_error_code ret = -1;
228 if (flags & SCAN_INTERFACES) {
229 ret = find_all_addresses (context, res, flags);
230 if(ret || res->len == 0)
231 ret = gethostname_fallback (context, res);
236 if(ret == 0 && (flags & EXTRA_ADDRESSES)) {
238 /* append user specified addresses */
239 ret = krb5_get_extra_addresses(context, &a);
241 krb5_free_addresses(context, res);
244 ret = krb5_append_addresses(context, res, &a);
246 krb5_free_addresses(context, res);
249 krb5_free_addresses(context, &a);
259 * Try to get all addresses, but return the one corresponding to
260 * `hostname' if we fail.
262 * Only include loopback address if there are no other.
265 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
266 krb5_get_all_client_addrs (krb5_context context, krb5_addresses *res)
268 int flags = LOOP_IF_NONE | EXTRA_ADDRESSES;
270 if (context->scan_interfaces)
271 flags |= SCAN_INTERFACES;
273 return get_addrs_int (context, res, flags);
277 * Try to get all local addresses that a server should listen to.
278 * If that fails, we return the address corresponding to `hostname'.
281 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
282 krb5_get_all_server_addrs (krb5_context context, krb5_addresses *res)
284 return get_addrs_int (context, res, LOOP | SCAN_INTERFACES);