2 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include "krb5_locl.h"
36 RCSID("$Id: get_addrs.c,v 1.45 2003/01/25 15:19:49 lha Exp $");
48 static krb5_error_code
49 gethostname_fallback (krb5_context context, krb5_addresses *res)
52 char hostname[MAXHOSTNAMELEN];
53 struct hostent *hostent;
55 if (gethostname (hostname, sizeof(hostname))) {
57 krb5_set_error_string (context, "gethostname: %s", strerror(ret));
60 hostent = roken_gethostbyname (hostname);
61 if (hostent == NULL) {
63 krb5_set_error_string (context, "gethostbyname %s: %s",
64 hostname, strerror(ret));
68 res->val = malloc (sizeof(*res->val));
69 if (res->val == NULL) {
70 krb5_set_error_string(context, "malloc: out of memory");
73 res->val[0].addr_type = hostent->h_addrtype;
74 res->val[0].address.data = NULL;
75 res->val[0].address.length = 0;
76 ret = krb5_data_copy (&res->val[0].address,
87 LOOP = 1, /* do include loopback interfaces */
88 LOOP_IF_NONE = 2, /* include loopback if no other if's */
89 EXTRA_ADDRESSES = 4, /* include extra addresses */
90 SCAN_INTERFACES = 8 /* scan interfaces for addresses */
94 * Try to figure out the addresses of all configured interfaces with a
95 * lot of magic ioctls.
98 static krb5_error_code
99 find_all_addresses (krb5_context context, krb5_addresses *res, int flags)
101 struct sockaddr sa_zero;
102 struct ifaddrs *ifa0, *ifa;
103 krb5_error_code ret = ENXIO;
105 krb5_addresses ignore_addresses;
109 if (getifaddrs(&ifa0) == -1) {
111 krb5_set_error_string(context, "getifaddrs: %s", strerror(ret));
115 memset(&sa_zero, 0, sizeof(sa_zero));
117 /* First, count all the ifaddrs. */
118 for (ifa = ifa0, num = 0; ifa != NULL; ifa = ifa->ifa_next, num++)
123 krb5_set_error_string(context, "no addresses found");
127 if (flags & EXTRA_ADDRESSES) {
128 /* we'll remove the addresses we don't care about */
129 ret = krb5_get_ignore_addresses(context, &ignore_addresses);
134 /* Allocate storage for them. */
135 res->val = calloc(num, sizeof(*res->val));
136 if (res->val == NULL) {
137 krb5_free_addresses(context, &ignore_addresses);
139 krb5_set_error_string (context, "malloc: out of memory");
143 /* Now traverse the list. */
144 for (ifa = ifa0, idx = 0; ifa != NULL; ifa = ifa->ifa_next) {
145 if ((ifa->ifa_flags & IFF_UP) == 0)
147 if (ifa->ifa_addr == NULL)
149 if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
151 if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
153 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) {
154 /* We'll deal with the LOOP_IF_NONE case later. */
155 if ((flags & LOOP) == 0)
159 ret = krb5_sockaddr2address(context, ifa->ifa_addr, &res->val[idx]);
162 * The most likely error here is going to be "Program
163 * lacks support for address type". This is no big
164 * deal -- just continue, and we'll listen on the
165 * addresses who's type we *do* support.
169 /* possibly skip this address? */
170 if((flags & EXTRA_ADDRESSES) &&
171 krb5_address_search(context, &res->val[idx], &ignore_addresses)) {
172 krb5_free_address(context, &res->val[idx]);
173 flags &= ~LOOP_IF_NONE; /* we actually found an address,
174 so don't add any loop-back
183 * If no addresses were found, and LOOP_IF_NONE is set, then find
184 * the loopback addresses and add them to our list.
186 if ((flags & LOOP_IF_NONE) != 0 && idx == 0) {
187 for (ifa = ifa0; ifa != NULL; ifa = ifa->ifa_next) {
188 if ((ifa->ifa_flags & IFF_UP) == 0)
190 if (ifa->ifa_addr == NULL)
192 if (memcmp(ifa->ifa_addr, &sa_zero, sizeof(sa_zero)) == 0)
194 if (krb5_sockaddr_uninteresting(ifa->ifa_addr))
197 if ((ifa->ifa_flags & IFF_LOOPBACK) != 0) {
198 ret = krb5_sockaddr2address(context,
199 ifa->ifa_addr, &res->val[idx]);
206 if((flags & EXTRA_ADDRESSES) &&
207 krb5_address_search(context, &res->val[idx],
208 &ignore_addresses)) {
209 krb5_free_address(context, &res->val[idx]);
217 if (flags & EXTRA_ADDRESSES)
218 krb5_free_addresses(context, &ignore_addresses);
223 res->len = idx; /* Now a count. */
227 static krb5_error_code
228 get_addrs_int (krb5_context context, krb5_addresses *res, int flags)
230 krb5_error_code ret = -1;
232 if (flags & SCAN_INTERFACES) {
233 ret = find_all_addresses (context, res, flags);
234 if(ret || res->len == 0)
235 ret = gethostname_fallback (context, res);
242 if(ret == 0 && (flags & EXTRA_ADDRESSES)) {
244 /* append user specified addresses */
245 ret = krb5_get_extra_addresses(context, &a);
247 krb5_free_addresses(context, res);
250 ret = krb5_append_addresses(context, res, &a);
252 krb5_free_addresses(context, res);
255 krb5_free_addresses(context, &a);
265 * Try to get all addresses, but return the one corresponding to
266 * `hostname' if we fail.
268 * Only include loopback address if there are no other.
272 krb5_get_all_client_addrs (krb5_context context, krb5_addresses *res)
274 int flags = LOOP_IF_NONE | EXTRA_ADDRESSES;
276 if (context->scan_interfaces)
277 flags |= SCAN_INTERFACES;
279 return get_addrs_int (context, res, flags);
283 * Try to get all local addresses that a server should listen to.
284 * If that fails, we return the address corresponding to `hostname'.
288 krb5_get_all_server_addrs (krb5_context context, krb5_addresses *res)
290 return get_addrs_int (context, res, LOOP | SCAN_INTERFACES);