2 * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $
7 * Copyright (c) 2000 The NetBSD Foundation, Inc.
10 * This code is derived from software contributed to The NetBSD Foundation
11 * by Frank van der Linden.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
35 #include <sys/types.h>
36 #include <sys/socket.h>
37 #include <sys/queue.h>
39 #include <netinet/in.h>
48 #include <netconfig.h>
50 #include <arpa/inet.h>
54 static struct sockaddr_in *local_in4;
56 static struct sockaddr_in6 *local_in6;
59 static int bitmaskcmp(struct sockaddr *, struct sockaddr *, struct sockaddr *);
61 static void in6_fillscopeid(struct sockaddr_in6 *);
65 * For all bits set in "mask", compare the corresponding bits in
66 * "dst" and "src", and see if they match. Returns 0 if the addresses
70 bitmaskcmp(struct sockaddr *dst, struct sockaddr *src, struct sockaddr *mask)
73 u_int8_t *p1, *p2, *netmask;
76 if (dst->sa_family != src->sa_family ||
77 dst->sa_family != mask->sa_family)
80 switch (dst->sa_family) {
82 p1 = (uint8_t*) &SA2SINADDR(dst);
83 p2 = (uint8_t*) &SA2SINADDR(src);
84 netmask = (uint8_t*) &SA2SINADDR(mask);
85 bytelen = sizeof(struct in_addr);
89 p1 = (uint8_t*) &SA2SIN6ADDR(dst);
90 p2 = (uint8_t*) &SA2SIN6ADDR(src);
91 netmask = (uint8_t*) &SA2SIN6ADDR(mask);
92 bytelen = sizeof(struct in6_addr);
99 for (i = 0; i < bytelen; i++)
100 if ((p1[i] & netmask[i]) != (p2[i] & netmask[i]))
106 * Similar to code in ifconfig.c. Fill in the scope ID for link-local
107 * addresses returned by getifaddrs().
111 in6_fillscopeid(struct sockaddr_in6 *sin6)
115 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
116 ifindex = ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
117 if (sin6->sin6_scope_id == 0 && ifindex != 0) {
118 sin6->sin6_scope_id = ifindex;
119 *(u_int16_t *)&sin6->sin6_addr.s6_addr[2] = 0;
126 * Find a server address that can be used by `caller' to contact
127 * the local service specified by `serv_uaddr'. If `clnt_uaddr' is
128 * non-NULL, it is used instead of `caller' as a hint suggesting
129 * the best address (e.g. the `r_addr' field of an rpc, which
130 * contains the rpcbind server address that the caller used).
132 * Returns the best server address as a malloc'd "universal address"
133 * string which should be freed by the caller. On error, returns NULL.
136 addrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr,
139 struct ifaddrs *ifap, *ifp = NULL, *bestif;
140 struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf;
141 struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa;
142 struct sockaddr_storage ss;
143 struct netconfig *nconf;
144 char *caller_uaddr = NULL;
146 const char *hint_uaddr = NULL;
153 fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr,
154 clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid);
156 caller_sa = caller->buf;
157 if ((nconf = rpcbind_get_conf(netid)) == NULL)
159 if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL)
163 * Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its
164 * address family is different from that of the caller.
167 if (clnt_uaddr != NULL) {
169 hint_uaddr = clnt_uaddr;
171 if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL)
173 hint_sa = hint_nbp->buf;
175 if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) {
177 hint_uaddr = caller_uaddr;
179 hint_sa = caller->buf;
184 fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr);
186 /* Local caller, just return the server address. */
187 if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 ||
188 strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') {
189 ret = strdup(serv_uaddr);
193 if (getifaddrs(&ifp) < 0)
197 * Loop through all interface addresses. We are listening to an address
198 * if any of the following are true:
199 * a) It's a loopback address
200 * b) It was specified with the -h command line option
201 * c) There were no -h command line options.
203 * Among addresses on which we are listening, choose in order of
204 * preference an address that is:
206 * a) Equal to the hint
207 * b) A link local address with the same scope ID as the client's
208 * address, if the client's address is also link local
209 * c) An address on the same subnet as the client's address
210 * d) A non-localhost, non-p2p address
211 * e) Any usable address
215 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
216 ifsa = ifap->ifa_addr;
217 ifmasksa = ifap->ifa_netmask;
219 /* Skip addresses where we don't listen */
220 if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family ||
221 !(ifap->ifa_flags & IFF_UP))
224 if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa))
227 if ((hint_sa->sa_family == AF_INET) &&
228 ((((struct sockaddr_in*)hint_sa)->sin_addr.s_addr ==
229 ((struct sockaddr_in*)ifsa)->sin_addr.s_addr))) {
230 const int goodness = 4;
232 bestif_goodness = goodness;
237 if ((hint_sa->sa_family == AF_INET6) &&
238 (0 == memcmp(&((struct sockaddr_in6*)hint_sa)->sin6_addr,
239 &((struct sockaddr_in6*)ifsa)->sin6_addr,
240 sizeof(struct in6_addr))) &&
241 (((struct sockaddr_in6*)hint_sa)->sin6_scope_id ==
242 (((struct sockaddr_in6*)ifsa)->sin6_scope_id))) {
243 const int goodness = 4;
245 bestif_goodness = goodness;
249 if (hint_sa->sa_family == AF_INET6) {
251 * For v6 link local addresses, if the caller is on
252 * a link-local address then use the scope id to see
255 in6_fillscopeid(SA2SIN6(ifsa));
256 if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) &&
257 IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) &&
258 IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) {
259 if (SA2SIN6(ifsa)->sin6_scope_id ==
260 SA2SIN6(caller_sa)->sin6_scope_id) {
261 const int goodness = 3;
263 if (bestif_goodness < goodness) {
265 bestif_goodness = goodness;
271 if (0 == bitmaskcmp(hint_sa, ifsa, ifmasksa)) {
272 const int goodness = 2;
274 if (bestif_goodness < goodness) {
276 bestif_goodness = goodness;
279 if (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
280 const int goodness = 1;
282 if (bestif_goodness < goodness) {
284 bestif_goodness = goodness;
295 * Construct the new address using the address from
296 * `bestif', and the port number from `serv_uaddr'.
298 serv_nbp = uaddr2taddr(nconf, serv_uaddr);
299 if (serv_nbp == NULL)
301 serv_sa = serv_nbp->buf;
303 memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len);
304 switch (ss.ss_family) {
306 SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port;
310 SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port;
314 tbuf.len = ss.ss_len;
315 tbuf.maxlen = sizeof(ss);
317 ret = taddr2uaddr(nconf, &tbuf);
321 if (hint_nbp != NULL) {
325 if (serv_nbp != NULL) {
334 fprintf(stderr, "addrmerge: returning %s\n", ret);
343 struct ifaddrs *ifap, *ifp;
344 struct ipv6_mreq mreq6;
345 unsigned int ifindex;
349 struct addrinfo hints, *res;
351 memset(&hints, 0, sizeof hints);
352 hints.ai_family = AF_INET;
353 if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) {
355 fprintf(stderr, "can't get local ip4 address: %s\n",
356 gai_strerror(ecode));
358 local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4);
359 if (local_in4 == NULL) {
361 fprintf(stderr, "can't alloc local ip4 addr\n");
364 memcpy(local_in4, res->ai_addr, sizeof *local_in4);
369 hints.ai_family = AF_INET6;
370 if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) {
372 fprintf(stderr, "can't get local ip6 address: %s\n",
373 gai_strerror(ecode));
375 local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6);
376 if (local_in6 == NULL) {
378 fprintf(stderr, "can't alloc local ip6 addr\n");
381 memcpy(local_in6, res->ai_addr, sizeof *local_in6);
386 * Now join the RPC ipv6 multicast group on all interfaces.
388 if (getifaddrs(&ifp) < 0)
391 mreq6.ipv6mr_interface = 0;
392 inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr);
394 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
397 fprintf(stderr, "couldn't create ip6 socket");
402 * Loop through all interfaces. For each IPv6 multicast-capable
403 * interface, join the RPC multicast group on that interface.
405 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
406 if (ifap->ifa_addr->sa_family != AF_INET6 ||
407 !(ifap->ifa_flags & IFF_MULTICAST))
409 ifindex = if_nametoindex(ifap->ifa_name);
410 if (ifindex == mreq6.ipv6mr_interface)
412 * Already did this one.
415 mreq6.ipv6mr_interface = ifindex;
416 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6,
419 perror("setsockopt v6 multicast");
433 return (struct sockaddr *)local_in4;
436 return (struct sockaddr *)local_in6;