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 0 : krb5_error_code ret;
50 0 : char hostname[MAXHOSTNAMELEN];
51 0 : 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 : return krb5_enomem(context);
69 0 : res->val[0].addr_type = hostent->h_addrtype;
70 0 : res->val[0].address.data = NULL;
71 0 : res->val[0].address.length = 0;
72 0 : ret = krb5_data_copy (&res->val[0].address,
73 0 : hostent->h_addr,
74 0 : hostent->h_length);
75 0 : if (ret) {
76 0 : free (res->val);
77 0 : return ret;
78 : }
79 0 : return 0;
80 : }
81 :
82 : enum {
83 : LOOP = 1, /* do include loopback addrs */
84 : LOOP_IF_NONE = 2, /* include loopback addrs if no others */
85 : EXTRA_ADDRESSES = 4, /* include extra addresses */
86 : SCAN_INTERFACES = 8 /* scan interfaces for addresses */
87 : };
88 :
89 : /*
90 : * Try to figure out the addresses of all configured interfaces with a
91 : * lot of magic ioctls.
92 : */
93 :
94 : static krb5_error_code
95 0 : find_all_addresses (krb5_context context, krb5_addresses *res, int flags)
96 : {
97 0 : struct sockaddr sa_zero;
98 0 : struct ifaddrs *ifa0, *ifa;
99 0 : krb5_error_code ret = ENXIO;
100 0 : unsigned int num, idx;
101 0 : krb5_addresses ignore_addresses;
102 :
103 0 : if (getifaddrs(&ifa0) == -1) {
104 0 : ret = errno;
105 0 : krb5_set_error_message(context, ret, "getifaddrs: %s", strerror(ret));
106 0 : return (ret);
107 : }
108 :
109 0 : memset(&sa_zero, 0, sizeof(sa_zero));
110 :
111 : /* First, count all the ifaddrs. */
112 0 : for (ifa = ifa0, num = 0; ifa != NULL; ifa = ifa->ifa_next, num++)
113 : /* nothing */;
114 :
115 0 : if (num == 0) {
116 0 : freeifaddrs(ifa0);
117 0 : krb5_set_error_message(context, ENXIO, N_("no addresses found", ""));
118 0 : return (ENXIO);
119 : }
120 :
121 0 : if (flags & EXTRA_ADDRESSES) {
122 : /* we'll remove the addresses we don't care about */
123 0 : ret = krb5_get_ignore_addresses(context, &ignore_addresses);
124 0 : if(ret)
125 0 : return ret;
126 : }
127 :
128 : /* Allocate storage for them. */
129 0 : res->val = calloc(num, sizeof(*res->val));
130 0 : if (res->val == NULL) {
131 0 : if (flags & EXTRA_ADDRESSES)
132 0 : krb5_free_addresses(context, &ignore_addresses);
133 0 : freeifaddrs(ifa0);
134 0 : return krb5_enomem(context);
135 : }
136 :
137 : /* Now traverse the list. */
138 0 : for (ifa = ifa0, idx = 0; ifa != NULL; ifa = ifa->ifa_next) {
139 0 : if ((ifa->ifa_flags & IFF_UP) == 0)
140 0 : continue;
141 0 : if (ifa->ifa_addr == NULL)
142 0 : continue;
143 0 : if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
144 0 : continue;
145 0 : if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
146 0 : continue;
147 0 : if (krb5_sockaddr_is_loopback(ifa->ifa_addr) && (flags & LOOP) == 0)
148 : /* We'll deal with the LOOP_IF_NONE case later. */
149 0 : continue;
150 :
151 0 : ret = krb5_sockaddr2address(context, ifa->ifa_addr, &res->val[idx]);
152 0 : if (ret) {
153 : /*
154 : * The most likely error here is going to be "Program
155 : * lacks support for address type". This is no big
156 : * deal -- just continue, and we'll listen on the
157 : * addresses who's type we *do* support.
158 : */
159 0 : continue;
160 : }
161 : /* possibly skip this address? */
162 0 : if((flags & EXTRA_ADDRESSES) &&
163 0 : krb5_address_search(context, &res->val[idx], &ignore_addresses)) {
164 0 : krb5_free_address(context, &res->val[idx]);
165 0 : flags &= ~LOOP_IF_NONE; /* we actually found an address,
166 : so don't add any loop-back
167 : addresses */
168 0 : continue;
169 : }
170 :
171 0 : idx++;
172 : }
173 :
174 : /*
175 : * If no addresses were found, and LOOP_IF_NONE is set, then find
176 : * the loopback addresses and add them to our list.
177 : */
178 0 : if ((flags & LOOP_IF_NONE) != 0 && idx == 0) {
179 0 : for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) {
180 0 : if ((ifa->ifa_flags & IFF_UP) == 0)
181 0 : continue;
182 0 : if (ifa->ifa_addr == NULL)
183 0 : continue;
184 0 : if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
185 0 : continue;
186 0 : if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
187 0 : continue;
188 0 : if (!krb5_sockaddr_is_loopback(ifa->ifa_addr))
189 0 : continue;
190 0 : if ((ifa->ifa_flags & IFF_LOOPBACK) == 0)
191 : /* Presumably loopback addrs are only used on loopback ifs! */
192 0 : continue;
193 0 : ret = krb5_sockaddr2address(context,
194 0 : ifa->ifa_addr, &res->val[idx]);
195 0 : if (ret)
196 0 : continue; /* We don't consider this failure fatal */
197 0 : if((flags & EXTRA_ADDRESSES) &&
198 0 : krb5_address_search(context, &res->val[idx],
199 : &ignore_addresses)) {
200 0 : krb5_free_address(context, &res->val[idx]);
201 0 : continue;
202 : }
203 0 : idx++;
204 : }
205 : }
206 :
207 0 : if (flags & EXTRA_ADDRESSES)
208 0 : krb5_free_addresses(context, &ignore_addresses);
209 0 : freeifaddrs(ifa0);
210 0 : if (ret) {
211 0 : free(res->val);
212 0 : res->val = NULL;
213 : } else
214 0 : res->len = idx; /* Now a count. */
215 0 : return (ret);
216 : }
217 :
218 : static krb5_error_code
219 0 : get_addrs_int (krb5_context context, krb5_addresses *res, int flags)
220 : {
221 0 : krb5_error_code ret = -1;
222 :
223 0 : res->len = 0;
224 0 : res->val = NULL;
225 :
226 0 : if (flags & SCAN_INTERFACES) {
227 0 : ret = find_all_addresses (context, res, flags);
228 0 : if(ret || res->len == 0)
229 0 : ret = gethostname_fallback (context, res);
230 : } else {
231 0 : ret = 0;
232 : }
233 :
234 0 : if(ret == 0 && (flags & EXTRA_ADDRESSES)) {
235 0 : krb5_addresses a;
236 : /* append user specified addresses */
237 0 : ret = krb5_get_extra_addresses(context, &a);
238 0 : if(ret) {
239 0 : krb5_free_addresses(context, res);
240 0 : return ret;
241 : }
242 0 : ret = krb5_append_addresses(context, res, &a);
243 0 : if(ret) {
244 0 : krb5_free_addresses(context, res);
245 0 : return ret;
246 : }
247 0 : krb5_free_addresses(context, &a);
248 : }
249 0 : if(res->len == 0) {
250 0 : free(res->val);
251 0 : res->val = NULL;
252 : }
253 0 : return ret;
254 : }
255 :
256 : /*
257 : * Try to get all addresses, but return the one corresponding to
258 : * `hostname' if we fail.
259 : *
260 : * Only include loopback address if there are no other.
261 : */
262 :
263 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
264 0 : krb5_get_all_client_addrs (krb5_context context, krb5_addresses *res)
265 : {
266 0 : int flags = LOOP_IF_NONE | EXTRA_ADDRESSES;
267 :
268 0 : if (context->scan_interfaces)
269 0 : flags |= SCAN_INTERFACES;
270 :
271 0 : return get_addrs_int (context, res, flags);
272 : }
273 :
274 : /*
275 : * Try to get all local addresses that a server should listen to.
276 : * If that fails, we return the address corresponding to `hostname'.
277 : */
278 :
279 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
280 0 : krb5_get_all_server_addrs (krb5_context context, krb5_addresses *res)
281 : {
282 0 : return get_addrs_int (context, res, LOOP | SCAN_INTERFACES);
283 : }
|
