Line data Source code
1 : /*
2 : * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
3 : * (Royal Institute of Technology, Stockholm, Sweden).
4 : * All rights reserved.
5 : *
6 : * Redistribution and use in source and binary forms, with or without
7 : * modification, are permitted provided that the following conditions
8 : * are met:
9 : *
10 : * 1. Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
12 : *
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.
16 : *
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.
20 : *
21 : * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 : * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 : * SUCH DAMAGE.
32 : */
33 :
34 : #include "krb5_locl.h"
35 :
36 : #ifdef __osf__
37 : /* hate */
38 : struct rtentry;
39 : struct mbuf;
40 : #endif
41 : #ifdef HAVE_NET_IF_H
42 : #include <net/if.h>
43 : #endif
44 : #include <ifaddrs.h>
45 :
46 : static krb5_error_code
47 0 : gethostname_fallback (krb5_context context, krb5_addresses *res)
48 : {
49 : krb5_error_code ret;
50 : char hostname[MAXHOSTNAMELEN];
51 : struct hostent *hostent;
52 :
53 0 : if (gethostname (hostname, sizeof(hostname))) {
54 0 : ret = errno;
55 0 : krb5_set_error_message(context, ret, "gethostname: %s", strerror(ret));
56 0 : return ret;
57 : }
58 0 : hostent = roken_gethostbyname (hostname);
59 0 : if (hostent == NULL) {
60 0 : ret = errno;
61 0 : krb5_set_error_message (context, ret, "gethostbyname %s: %s",
62 : hostname, strerror(ret));
63 0 : return ret;
64 : }
65 0 : res->len = 1;
66 0 : res->val = malloc (sizeof(*res->val));
67 0 : if (res->val == NULL) {
68 0 : krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
69 0 : return ENOMEM;
70 : }
71 0 : res->val[0].addr_type = hostent->h_addrtype;
72 0 : res->val[0].address.data = NULL;
73 0 : res->val[0].address.length = 0;
74 0 : ret = krb5_data_copy (&res->val[0].address,
75 0 : hostent->h_addr,
76 0 : hostent->h_length);
77 0 : if (ret) {
78 0 : free (res->val);
79 0 : return ret;
80 : }
81 0 : return 0;
82 : }
83 :
84 : enum {
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 */
89 : };
90 :
91 : /*
92 : * Try to figure out the addresses of all configured interfaces with a
93 : * lot of magic ioctls.
94 : */
95 :
96 : static krb5_error_code
97 0 : find_all_addresses (krb5_context context, krb5_addresses *res, int flags)
98 : {
99 : struct sockaddr sa_zero;
100 : struct ifaddrs *ifa0, *ifa;
101 0 : krb5_error_code ret = ENXIO;
102 : unsigned int num, idx;
103 : krb5_addresses ignore_addresses;
104 :
105 0 : if (getifaddrs(&ifa0) == -1) {
106 0 : ret = errno;
107 0 : krb5_set_error_message(context, ret, "getifaddrs: %s", strerror(ret));
108 0 : return (ret);
109 : }
110 :
111 0 : memset(&sa_zero, 0, sizeof(sa_zero));
112 :
113 : /* First, count all the ifaddrs. */
114 0 : for (ifa = ifa0, num = 0; ifa != NULL; ifa = ifa->ifa_next, num++)
115 : /* nothing */;
116 :
117 0 : if (num == 0) {
118 0 : freeifaddrs(ifa0);
119 0 : krb5_set_error_message(context, ENXIO, N_("no addresses found", ""));
120 0 : return (ENXIO);
121 : }
122 :
123 0 : if (flags & EXTRA_ADDRESSES) {
124 : /* we'll remove the addresses we don't care about */
125 0 : ret = krb5_get_ignore_addresses(context, &ignore_addresses);
126 0 : if(ret)
127 0 : return ret;
128 : }
129 :
130 : /* Allocate storage for them. */
131 0 : res->val = calloc(num, sizeof(*res->val));
132 0 : if (res->val == NULL) {
133 0 : if (flags & EXTRA_ADDRESSES)
134 0 : krb5_free_addresses(context, &ignore_addresses);
135 0 : freeifaddrs(ifa0);
136 0 : krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
137 0 : return ENOMEM;
138 : }
139 :
140 : /* Now traverse the list. */
141 0 : for (ifa = ifa0, idx = 0; ifa != NULL; ifa = ifa->ifa_next) {
142 0 : if ((ifa->ifa_flags & IFF_UP) == 0)
143 0 : continue;
144 0 : if (ifa->ifa_addr == NULL)
145 0 : continue;
146 0 : if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
147 0 : continue;
148 0 : if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
149 0 : continue;
150 0 : if (krb5_sockaddr_is_loopback(ifa->ifa_addr) && (flags & LOOP) == 0)
151 : /* We'll deal with the LOOP_IF_NONE case later. */
152 0 : continue;
153 :
154 0 : ret = krb5_sockaddr2address(context, ifa->ifa_addr, &res->val[idx]);
155 0 : if (ret) {
156 : /*
157 : * The most likely error here is going to be "Program
158 : * lacks support for address type". This is no big
159 : * deal -- just continue, and we'll listen on the
160 : * addresses who's type we *do* support.
161 : */
162 0 : continue;
163 : }
164 : /* possibly skip this address? */
165 0 : if((flags & EXTRA_ADDRESSES) &&
166 0 : krb5_address_search(context, &res->val[idx], &ignore_addresses)) {
167 0 : krb5_free_address(context, &res->val[idx]);
168 0 : flags &= ~LOOP_IF_NONE; /* we actually found an address,
169 : so don't add any loop-back
170 : addresses */
171 0 : continue;
172 : }
173 :
174 0 : idx++;
175 : }
176 :
177 : /*
178 : * If no addresses were found, and LOOP_IF_NONE is set, then find
179 : * the loopback addresses and add them to our list.
180 : */
181 0 : if ((flags & LOOP_IF_NONE) != 0 && idx == 0) {
182 0 : for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) {
183 0 : if ((ifa->ifa_flags & IFF_UP) == 0)
184 0 : continue;
185 0 : if (ifa->ifa_addr == NULL)
186 0 : continue;
187 0 : if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
188 0 : continue;
189 0 : if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
190 0 : continue;
191 0 : if (!krb5_sockaddr_is_loopback(ifa->ifa_addr))
192 0 : continue;
193 0 : if ((ifa->ifa_flags & IFF_LOOPBACK) == 0)
194 : /* Presumably loopback addrs are only used on loopback ifs! */
195 0 : continue;
196 0 : ret = krb5_sockaddr2address(context,
197 0 : ifa->ifa_addr, &res->val[idx]);
198 0 : if (ret)
199 0 : continue; /* We don't consider this failure fatal */
200 0 : if((flags & EXTRA_ADDRESSES) &&
201 0 : krb5_address_search(context, &res->val[idx],
202 : &ignore_addresses)) {
203 0 : krb5_free_address(context, &res->val[idx]);
204 0 : continue;
205 : }
206 0 : idx++;
207 : }
208 : }
209 :
210 0 : if (flags & EXTRA_ADDRESSES)
211 0 : krb5_free_addresses(context, &ignore_addresses);
212 0 : freeifaddrs(ifa0);
213 0 : if (ret) {
214 0 : free(res->val);
215 0 : res->val = NULL;
216 : } else
217 0 : res->len = idx; /* Now a count. */
218 0 : return (ret);
219 : }
220 :
221 : static krb5_error_code
222 0 : get_addrs_int (krb5_context context, krb5_addresses *res, int flags)
223 : {
224 0 : krb5_error_code ret = -1;
225 :
226 0 : res->len = 0;
227 0 : res->val = NULL;
228 :
229 0 : if (flags & SCAN_INTERFACES) {
230 0 : ret = find_all_addresses (context, res, flags);
231 0 : if(ret || res->len == 0)
232 0 : ret = gethostname_fallback (context, res);
233 : } else {
234 0 : ret = 0;
235 : }
236 :
237 0 : if(ret == 0 && (flags & EXTRA_ADDRESSES)) {
238 : krb5_addresses a;
239 : /* append user specified addresses */
240 0 : ret = krb5_get_extra_addresses(context, &a);
241 0 : if(ret) {
242 0 : krb5_free_addresses(context, res);
243 0 : return ret;
244 : }
245 0 : ret = krb5_append_addresses(context, res, &a);
246 0 : if(ret) {
247 0 : krb5_free_addresses(context, res);
248 0 : return ret;
249 : }
250 0 : krb5_free_addresses(context, &a);
251 : }
252 0 : if(res->len == 0) {
253 0 : free(res->val);
254 0 : res->val = NULL;
255 : }
256 0 : return ret;
257 : }
258 :
259 : /*
260 : * Try to get all addresses, but return the one corresponding to
261 : * `hostname' if we fail.
262 : *
263 : * Only include loopback address if there are no other.
264 : */
265 :
266 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
267 0 : krb5_get_all_client_addrs (krb5_context context, krb5_addresses *res)
268 : {
269 0 : int flags = LOOP_IF_NONE | EXTRA_ADDRESSES;
270 :
271 0 : if (context->scan_interfaces)
272 0 : flags |= SCAN_INTERFACES;
273 :
274 0 : return get_addrs_int (context, res, flags);
275 : }
276 :
277 : /*
278 : * Try to get all local addresses that a server should listen to.
279 : * If that fails, we return the address corresponding to `hostname'.
280 : */
281 :
282 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
283 0 : krb5_get_all_server_addrs (krb5_context context, krb5_addresses *res)
284 : {
285 0 : return get_addrs_int (context, res, LOOP | SCAN_INTERFACES);
286 : }
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