2 * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $
7 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
9 * Copyright (c) 2000 The NetBSD Foundation, Inc.
10 * All rights reserved.
12 * This code is derived from software contributed to The NetBSD Foundation
13 * by Frank van der Linden.
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
24 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
27 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
28 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
37 #include <sys/types.h>
38 #include <sys/socket.h>
39 #include <sys/queue.h>
41 #include <netinet/in.h>
50 #include <netconfig.h>
52 #include <arpa/inet.h>
56 static struct sockaddr_in *local_in4;
58 static struct sockaddr_in6 *local_in6;
61 static int bitmaskcmp(struct sockaddr *, struct sockaddr *, struct sockaddr *);
64 * For all bits set in "mask", compare the corresponding bits in
65 * "dst" and "src", and see if they match. Returns 0 if the addresses
69 bitmaskcmp(struct sockaddr *dst, struct sockaddr *src, struct sockaddr *mask)
72 u_int8_t *p1, *p2, *netmask;
75 if (dst->sa_family != src->sa_family ||
76 dst->sa_family != mask->sa_family)
79 switch (dst->sa_family) {
81 p1 = (uint8_t*) &SA2SINADDR(dst);
82 p2 = (uint8_t*) &SA2SINADDR(src);
83 netmask = (uint8_t*) &SA2SINADDR(mask);
84 bytelen = sizeof(struct in_addr);
88 p1 = (uint8_t*) &SA2SIN6ADDR(dst);
89 p2 = (uint8_t*) &SA2SIN6ADDR(src);
90 netmask = (uint8_t*) &SA2SIN6ADDR(mask);
91 bytelen = sizeof(struct in6_addr);
98 for (i = 0; i < bytelen; i++)
99 if ((p1[i] & netmask[i]) != (p2[i] & netmask[i]))
105 * Find a server address that can be used by `caller' to contact
106 * the local service specified by `serv_uaddr'. If `clnt_uaddr' is
107 * non-NULL, it is used instead of `caller' as a hint suggesting
108 * the best address (e.g. the `r_addr' field of an rpc, which
109 * contains the rpcbind server address that the caller used).
111 * Returns the best server address as a malloc'd "universal address"
112 * string which should be freed by the caller. On error, returns NULL.
115 addrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr,
118 struct ifaddrs *ifap, *ifp = NULL, *bestif;
119 struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf;
120 struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa;
121 struct sockaddr_storage ss;
122 struct netconfig *nconf;
123 char *caller_uaddr = NULL;
125 const char *hint_uaddr = NULL;
132 fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr,
133 clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid);
135 caller_sa = caller->buf;
136 if ((nconf = rpcbind_get_conf(netid)) == NULL)
138 if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL)
142 * Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its
143 * address family is different from that of the caller.
146 if (clnt_uaddr != NULL) {
148 hint_uaddr = clnt_uaddr;
150 if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL)
152 hint_sa = hint_nbp->buf;
154 if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) {
156 hint_uaddr = caller_uaddr;
158 hint_sa = caller->buf;
163 fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr);
165 /* Local caller, just return the server address. */
166 if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 ||
167 strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') {
168 ret = strdup(serv_uaddr);
172 if (getifaddrs(&ifp) < 0)
176 * Loop through all interface addresses. We are listening to an address
177 * if any of the following are true:
178 * a) It's a loopback address
179 * b) It was specified with the -h command line option
180 * c) There were no -h command line options.
182 * Among addresses on which we are listening, choose in order of
183 * preference an address that is:
185 * a) Equal to the hint
186 * b) A link local address with the same scope ID as the client's
187 * address, if the client's address is also link local
188 * c) An address on the same subnet as the client's address
189 * d) A non-localhost, non-p2p address
190 * e) Any usable address
194 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
195 ifsa = ifap->ifa_addr;
196 ifmasksa = ifap->ifa_netmask;
198 /* Skip addresses where we don't listen */
199 if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family ||
200 !(ifap->ifa_flags & IFF_UP))
203 if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa))
206 if ((hint_sa->sa_family == AF_INET) &&
207 ((((struct sockaddr_in*)hint_sa)->sin_addr.s_addr ==
208 ((struct sockaddr_in*)ifsa)->sin_addr.s_addr))) {
209 const int goodness = 4;
211 bestif_goodness = goodness;
216 if ((hint_sa->sa_family == AF_INET6) &&
217 (0 == memcmp(&((struct sockaddr_in6*)hint_sa)->sin6_addr,
218 &((struct sockaddr_in6*)ifsa)->sin6_addr,
219 sizeof(struct in6_addr))) &&
220 (((struct sockaddr_in6*)hint_sa)->sin6_scope_id ==
221 (((struct sockaddr_in6*)ifsa)->sin6_scope_id))) {
222 const int goodness = 4;
224 bestif_goodness = goodness;
228 if (hint_sa->sa_family == AF_INET6) {
230 * For v6 link local addresses, if the caller is on
231 * a link-local address then use the scope id to see
234 if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) &&
235 IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) &&
236 IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) {
237 if (SA2SIN6(ifsa)->sin6_scope_id ==
238 SA2SIN6(caller_sa)->sin6_scope_id) {
239 const int goodness = 3;
241 if (bestif_goodness < goodness) {
243 bestif_goodness = goodness;
249 if (0 == bitmaskcmp(hint_sa, ifsa, ifmasksa)) {
250 const int goodness = 2;
252 if (bestif_goodness < goodness) {
254 bestif_goodness = goodness;
257 if (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
258 const int goodness = 1;
260 if (bestif_goodness < goodness) {
262 bestif_goodness = goodness;
273 * Construct the new address using the address from
274 * `bestif', and the port number from `serv_uaddr'.
276 serv_nbp = uaddr2taddr(nconf, serv_uaddr);
277 if (serv_nbp == NULL)
279 serv_sa = serv_nbp->buf;
281 memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len);
282 switch (ss.ss_family) {
284 SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port;
288 SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port;
292 tbuf.len = ss.ss_len;
293 tbuf.maxlen = sizeof(ss);
295 ret = taddr2uaddr(nconf, &tbuf);
299 if (hint_nbp != NULL) {
303 if (serv_nbp != NULL) {
312 fprintf(stderr, "addrmerge: returning %s\n", ret);
321 struct ifaddrs *ifap, *ifp;
322 struct ipv6_mreq mreq6;
323 unsigned int ifindex;
327 struct addrinfo hints, *res;
329 memset(&hints, 0, sizeof hints);
330 hints.ai_family = AF_INET;
331 if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) {
333 fprintf(stderr, "can't get local ip4 address: %s\n",
334 gai_strerror(ecode));
336 local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4);
337 if (local_in4 == NULL) {
339 fprintf(stderr, "can't alloc local ip4 addr\n");
342 memcpy(local_in4, res->ai_addr, sizeof *local_in4);
347 hints.ai_family = AF_INET6;
348 if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) {
350 fprintf(stderr, "can't get local ip6 address: %s\n",
351 gai_strerror(ecode));
353 local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6);
354 if (local_in6 == NULL) {
356 fprintf(stderr, "can't alloc local ip6 addr\n");
359 memcpy(local_in6, res->ai_addr, sizeof *local_in6);
364 * Now join the RPC ipv6 multicast group on all interfaces.
366 if (getifaddrs(&ifp) < 0)
369 mreq6.ipv6mr_interface = 0;
370 inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr);
372 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
375 fprintf(stderr, "couldn't create ip6 socket");
380 * Loop through all interfaces. For each IPv6 multicast-capable
381 * interface, join the RPC multicast group on that interface.
383 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
384 if (ifap->ifa_addr->sa_family != AF_INET6 ||
385 !(ifap->ifa_flags & IFF_MULTICAST))
387 ifindex = if_nametoindex(ifap->ifa_name);
388 if (ifindex == mreq6.ipv6mr_interface)
390 * Already did this one.
393 mreq6.ipv6mr_interface = ifindex;
394 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6,
397 perror("setsockopt v6 multicast");
411 return (struct sockaddr *)local_in4;
414 return (struct sockaddr *)local_in6;