1 /* $NetBSD: util.c,v 1.2 2000/06/04 04:51:50 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/types.h> 40 #include <sys/socket.h> 41 #include <sys/queue.h> 42 #include <net/if.h> 43 #include <netinet/in.h> 44 #include <ifaddrs.h> 45 #include <sys/poll.h> 46 #include <rpc/rpc.h> 47 #include <errno.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 #include <netdb.h> 52 #include <netconfig.h> 53 #include <stdio.h> 54 #include <arpa/inet.h> 55 56 #include "rpcbind.h" 57 58 static struct sockaddr_in *local_in4; 59 #ifdef INET6 60 static struct sockaddr_in6 *local_in6; 61 #endif 62 63 static int bitmaskcmp __P((void *, void *, void *, int)); 64 #ifdef INET6 65 static void in6_fillscopeid __P((struct sockaddr_in6 *)); 66 #endif 67 68 /* 69 * For all bits set in "mask", compare the corresponding bits in 70 * "dst" and "src", and see if they match. 71 */ 72 static int 73 bitmaskcmp(void *dst, void *src, void *mask, int bytelen) 74 { 75 int i, j; 76 u_int8_t *p1 = dst, *p2 = src, *netmask = mask; 77 u_int8_t bitmask; 78 79 for (i = 0; i < bytelen; i++) { 80 for (j = 0; j < 8; j++) { 81 bitmask = 1 << j; 82 if (!(netmask[i] & bitmask)) 83 continue; 84 if ((p1[i] & bitmask) != (p2[i] & bitmask)) 85 return 1; 86 } 87 } 88 89 return 0; 90 } 91 92 /* 93 * Taken from ifconfig.c 94 */ 95 #ifdef INET6 96 static void 97 in6_fillscopeid(struct sockaddr_in6 *sin6) 98 { 99 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { 100 sin6->sin6_scope_id = 101 ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]); 102 sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0; 103 } 104 } 105 #endif 106 107 char * 108 addrmerge(struct netbuf *caller, char *serv_uaddr, char *clnt_uaddr, 109 char *netid) 110 { 111 struct ifaddrs *ifap, *ifp; 112 #ifdef INET6 113 struct sockaddr_in6 *servsin6, *sin6mask, *clntsin6, *ifsin6, *realsin6; 114 struct sockaddr_in6 *newsin6; 115 #endif 116 struct sockaddr_in *servsin, *sinmask, *clntsin, *newsin, *ifsin; 117 struct netbuf *serv_nbp, *clnt_nbp = NULL, tbuf; 118 struct sockaddr *serv_sa; 119 struct sockaddr *clnt_sa; 120 struct sockaddr_storage ss; 121 struct netconfig *nconf; 122 struct sockaddr *clnt = caller->buf; 123 char *ret = NULL; 124 125 #ifdef ND_DEBUG 126 if (debugging) 127 fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, 128 clnt_uaddr, netid); 129 #endif 130 nconf = getnetconfigent(netid); 131 if (nconf == NULL) 132 return NULL; 133 134 serv_nbp = uaddr2taddr(nconf, serv_uaddr); 135 if (serv_nbp == NULL) 136 return NULL; 137 138 serv_sa = (struct sockaddr *)serv_nbp->buf; 139 if (clnt_uaddr != NULL) { 140 clnt_nbp = uaddr2taddr(nconf, clnt_uaddr); 141 clnt_sa = (struct sockaddr *)clnt_nbp->buf; 142 } else { 143 clnt_sa = (struct sockaddr *) 144 malloc(sizeof (struct sockaddr_storage)); 145 memcpy(clnt_sa, clnt, clnt->sa_len); 146 } 147 148 if (getifaddrs(&ifp) < 0) 149 return 0; 150 151 /* 152 * Loop through all interfaces. For each interface, see if the 153 * network portion of its address is equal to that of the client. 154 * If so, we have found the interface that we want to use. 155 */ 156 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 157 if (ifap->ifa_addr->sa_family != clnt->sa_family || 158 !(ifap->ifa_flags & IFF_UP)) 159 continue; 160 161 switch (clnt->sa_family) { 162 case AF_INET: 163 /* 164 * realsin: address that recvfrom gave us. 165 * ifsin: address of interface being examined. 166 * clntsin: address that client want us to contact 167 * it on 168 * servsin: local address of RPC service. 169 * sinmask: netmask of this interface 170 * newsin: initially a copy of clntsin, eventually 171 * the merged address 172 */ 173 servsin = (struct sockaddr_in *)serv_sa; 174 clntsin = (struct sockaddr_in *)clnt_sa; 175 sinmask = (struct sockaddr_in *)ifap->ifa_netmask; 176 newsin = (struct sockaddr_in *)&ss; 177 ifsin = (struct sockaddr_in *)ifap->ifa_addr; 178 if (!bitmaskcmp(&ifsin->sin_addr, &clntsin->sin_addr, 179 &sinmask->sin_addr, sizeof (struct in_addr))) { 180 /* 181 * Found it. 182 */ 183 memcpy(newsin, ifap->ifa_addr, 184 clnt_sa->sa_len); 185 newsin->sin_port = servsin->sin_port; 186 tbuf.len = clnt_sa->sa_len; 187 tbuf.maxlen = sizeof (struct sockaddr_storage); 188 tbuf.buf = newsin; 189 goto found; 190 } 191 break; 192 #ifdef INET6 193 case AF_INET6: 194 /* 195 * realsin6: address that recvfrom gave us. 196 * ifsin6: address of interface being examined. 197 * clntsin6: address that client want us to contact 198 * it on 199 * servsin6: local address of RPC service. 200 * sin6mask: netmask of this interface 201 * newsin6: initially a copy of clntsin, eventually 202 * the merged address 203 * 204 * For v6 link local addresses, if the client contacted 205 * us via a link-local address, and wants us to reply 206 * to one, use the scope id to see which one. 207 */ 208 realsin6 = (struct sockaddr_in6 *)clnt; 209 ifsin6 = (struct sockaddr_in6 *)ifap->ifa_addr; 210 in6_fillscopeid(ifsin6); 211 clntsin6 = (struct sockaddr_in6 *)clnt_sa; 212 servsin6 = (struct sockaddr_in6 *)serv_sa; 213 sin6mask = (struct sockaddr_in6 *)ifap->ifa_netmask; 214 newsin6 = (struct sockaddr_in6 *)&ss; 215 if (IN6_IS_ADDR_LINKLOCAL(&ifsin6->sin6_addr) && 216 IN6_IS_ADDR_LINKLOCAL(&realsin6->sin6_addr) && 217 IN6_IS_ADDR_LINKLOCAL(&clntsin6->sin6_addr)) { 218 if (ifsin6->sin6_scope_id != 219 realsin6->sin6_scope_id) 220 continue; 221 match: 222 memcpy(newsin6, ifsin6, clnt_sa->sa_len); 223 newsin6->sin6_port = servsin6->sin6_port; 224 tbuf.maxlen = sizeof (struct sockaddr_storage); 225 tbuf.len = clnt_sa->sa_len; 226 tbuf.buf = newsin6; 227 goto found; 228 } 229 if (!bitmaskcmp(&ifsin6->sin6_addr, 230 &clntsin6->sin6_addr, &sin6mask->sin6_addr, 231 sizeof (struct in6_addr))) 232 goto match; 233 break; 234 #endif 235 default: 236 goto freeit; 237 } 238 } 239 found: 240 if (ifap != NULL) 241 ret = taddr2uaddr(nconf, &tbuf); 242 freeit: 243 free(serv_sa); 244 free(serv_nbp); 245 if (clnt_sa != NULL) 246 free(clnt_sa); 247 if (clnt_nbp != NULL) 248 free(clnt_nbp); 249 freeifaddrs(ifp); 250 251 #ifdef ND_DEBUG 252 if (debugging) 253 fprintf(stderr, "addrmerge: returning %s\n", ret); 254 #endif 255 return ret; 256 } 257 258 void 259 network_init() 260 { 261 #ifdef INET6 262 struct ifaddrs *ifap, *ifp; 263 struct ipv6_mreq mreq6; 264 int ifindex, s; 265 #endif 266 int ecode; 267 struct addrinfo hints, *res; 268 269 memset(&hints, 0, sizeof hints); 270 hints.ai_family = AF_INET; 271 if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 272 if (debugging) 273 fprintf(stderr, "can't get local ip4 address: %s\n", 274 gai_strerror(ecode)); 275 } else { 276 local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4); 277 if (local_in4 == NULL) { 278 if (debugging) 279 fprintf(stderr, "can't alloc local ip4 addr\n"); 280 } 281 memcpy(local_in4, res->ai_addr, sizeof *local_in4); 282 } 283 284 #ifdef INET6 285 hints.ai_family = AF_INET6; 286 if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 287 if (debugging) 288 fprintf(stderr, "can't get local ip6 address: %s\n", 289 gai_strerror(ecode)); 290 } else { 291 local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6); 292 if (local_in6 == NULL) { 293 if (debugging) 294 fprintf(stderr, "can't alloc local ip6 addr\n"); 295 } 296 memcpy(local_in6, res->ai_addr, sizeof *local_in6); 297 } 298 299 /* 300 * Now join the RPC ipv6 multicast group on all interfaces. 301 */ 302 if (getifaddrs(&ifp) < 0) 303 return; 304 305 mreq6.ipv6mr_interface = 0; 306 inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr); 307 308 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 309 310 /* 311 * Loop through all interfaces. For each interface, see if the 312 * network portion of its address is equal to that of the client. 313 * If so, we have found the interface that we want to use. 314 */ 315 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 316 if (ifap->ifa_addr->sa_family != AF_INET6 || 317 !(ifap->ifa_flags & IFF_MULTICAST)) 318 continue; 319 ifindex = if_nametoindex(ifap->ifa_name); 320 if (ifindex == mreq6.ipv6mr_interface) 321 /* 322 * Already did this one. 323 */ 324 continue; 325 mreq6.ipv6mr_interface = ifindex; 326 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, 327 sizeof mreq6) < 0) 328 if (debugging) 329 perror("setsockopt v6 multicast"); 330 } 331 #endif 332 333 /* close(s); */ 334 } 335 336 struct sockaddr * 337 local_sa(int af) 338 { 339 switch (af) { 340 case AF_INET: 341 return (struct sockaddr *)local_in4; 342 #ifdef INET6 343 case AF_INET6: 344 return (struct sockaddr *)local_in6; 345 #endif 346 default: 347 return NULL; 348 } 349 } 350