1 /* 2 * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $ 3 * $FreeBSD$ 4 */ 5 6 /*- 7 * Copyright (c) 2000 The NetBSD Foundation, Inc. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by Frank van der Linden. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 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. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the NetBSD 24 * Foundation, Inc. and its contributors. 25 * 4. Neither the name of The NetBSD Foundation nor the names of its 26 * contributors may be used to endorse or promote products derived 27 * from this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 30 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 31 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 32 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 33 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 34 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 35 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 36 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 37 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 39 * POSSIBILITY OF SUCH DAMAGE. 40 */ 41 42 #include <sys/types.h> 43 #include <sys/socket.h> 44 #include <sys/queue.h> 45 #include <net/if.h> 46 #include <netinet/in.h> 47 #include <ifaddrs.h> 48 #include <sys/poll.h> 49 #include <rpc/rpc.h> 50 #include <errno.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include <netdb.h> 55 #include <netconfig.h> 56 #include <stdio.h> 57 #include <arpa/inet.h> 58 59 #include "rpcbind.h" 60 61 static struct sockaddr_in *local_in4; 62 #ifdef INET6 63 static struct sockaddr_in6 *local_in6; 64 #endif 65 66 static int bitmaskcmp __P((void *, void *, void *, int)); 67 #ifdef INET6 68 static void in6_fillscopeid __P((struct sockaddr_in6 *)); 69 #endif 70 71 /* 72 * For all bits set in "mask", compare the corresponding bits in 73 * "dst" and "src", and see if they match. 74 */ 75 static int 76 bitmaskcmp(void *dst, void *src, void *mask, int bytelen) 77 { 78 int i, j; 79 u_int8_t *p1 = dst, *p2 = src, *netmask = mask; 80 u_int8_t bitmask; 81 82 for (i = 0; i < bytelen; i++) { 83 for (j = 0; j < 8; j++) { 84 bitmask = 1 << j; 85 if (!(netmask[i] & bitmask)) 86 continue; 87 if ((p1[i] & bitmask) != (p2[i] & bitmask)) 88 return 1; 89 } 90 } 91 92 return 0; 93 } 94 95 /* 96 * Taken from ifconfig.c 97 */ 98 #ifdef INET6 99 static void 100 in6_fillscopeid(struct sockaddr_in6 *sin6) 101 { 102 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { 103 sin6->sin6_scope_id = 104 ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]); 105 sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0; 106 } 107 } 108 #endif 109 110 char * 111 addrmerge(struct netbuf *caller, char *serv_uaddr, char *clnt_uaddr, 112 char *netid) 113 { 114 struct ifaddrs *ifap, *ifp, *bestif; 115 #ifdef INET6 116 struct sockaddr_in6 *servsin6, *sin6mask, *clntsin6, *ifsin6, *realsin6; 117 struct sockaddr_in6 *newsin6; 118 #endif 119 struct sockaddr_in *servsin, *sinmask, *clntsin, *newsin, *ifsin; 120 struct netbuf *serv_nbp, *clnt_nbp = NULL, tbuf; 121 struct sockaddr *serv_sa; 122 struct sockaddr *clnt_sa; 123 struct sockaddr_storage ss; 124 struct netconfig *nconf; 125 struct sockaddr *clnt = caller->buf; 126 char *ret = NULL; 127 128 #ifdef ND_DEBUG 129 if (debugging) 130 fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, 131 clnt_uaddr, netid); 132 #endif 133 nconf = getnetconfigent(netid); 134 if (nconf == NULL) 135 return NULL; 136 137 /* 138 * Local merge, just return a duplicate. 139 */ 140 if (clnt_uaddr != NULL && strncmp(clnt_uaddr, "0.0.0.0.", 8) == 0) 141 return strdup(clnt_uaddr); 142 143 serv_nbp = uaddr2taddr(nconf, serv_uaddr); 144 if (serv_nbp == NULL) 145 return NULL; 146 147 serv_sa = (struct sockaddr *)serv_nbp->buf; 148 if (clnt_uaddr != NULL) { 149 clnt_nbp = uaddr2taddr(nconf, clnt_uaddr); 150 if (clnt_nbp == NULL) { 151 free(serv_nbp); 152 return NULL; 153 } 154 clnt_sa = (struct sockaddr *)clnt_nbp->buf; 155 if (clnt_sa->sa_family == AF_LOCAL) { 156 free(serv_nbp); 157 free(clnt_nbp); 158 free(clnt_sa); 159 return strdup(clnt_uaddr); 160 } 161 } else { 162 clnt_sa = (struct sockaddr *) 163 malloc(sizeof (struct sockaddr_storage)); 164 memcpy(clnt_sa, clnt, clnt->sa_len); 165 } 166 167 if (getifaddrs(&ifp) < 0) { 168 free(serv_nbp); 169 free(clnt_sa); 170 if (clnt_nbp != NULL) 171 free(clnt_nbp); 172 return 0; 173 } 174 175 /* 176 * Loop through all interfaces. For each interface, see if the 177 * network portion of its address is equal to that of the client. 178 * If so, we have found the interface that we want to use. 179 */ 180 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 181 if (ifap->ifa_addr->sa_family != clnt->sa_family || 182 !(ifap->ifa_flags & IFF_UP)) 183 continue; 184 185 switch (clnt->sa_family) { 186 case AF_INET: 187 /* 188 * realsin: address that recvfrom gave us. 189 * ifsin: address of interface being examined. 190 * clntsin: address that client want us to contact 191 * it on 192 * servsin: local address of RPC service. 193 * sinmask: netmask of this interface 194 * newsin: initially a copy of clntsin, eventually 195 * the merged address 196 */ 197 servsin = (struct sockaddr_in *)serv_sa; 198 clntsin = (struct sockaddr_in *)clnt_sa; 199 sinmask = (struct sockaddr_in *)ifap->ifa_netmask; 200 newsin = (struct sockaddr_in *)&ss; 201 ifsin = (struct sockaddr_in *)ifap->ifa_addr; 202 if (!bitmaskcmp(&ifsin->sin_addr, &clntsin->sin_addr, 203 &sinmask->sin_addr, sizeof (struct in_addr))) { 204 goto found; 205 } 206 break; 207 #ifdef INET6 208 case AF_INET6: 209 /* 210 * realsin6: address that recvfrom gave us. 211 * ifsin6: address of interface being examined. 212 * clntsin6: address that client want us to contact 213 * it on 214 * servsin6: local address of RPC service. 215 * sin6mask: netmask of this interface 216 * newsin6: initially a copy of clntsin, eventually 217 * the merged address 218 * 219 * For v6 link local addresses, if the client contacted 220 * us via a link-local address, and wants us to reply 221 * to one, use the scope id to see which one. 222 */ 223 realsin6 = (struct sockaddr_in6 *)clnt; 224 ifsin6 = (struct sockaddr_in6 *)ifap->ifa_addr; 225 in6_fillscopeid(ifsin6); 226 clntsin6 = (struct sockaddr_in6 *)clnt_sa; 227 servsin6 = (struct sockaddr_in6 *)serv_sa; 228 sin6mask = (struct sockaddr_in6 *)ifap->ifa_netmask; 229 newsin6 = (struct sockaddr_in6 *)&ss; 230 if (IN6_IS_ADDR_LINKLOCAL(&ifsin6->sin6_addr) && 231 IN6_IS_ADDR_LINKLOCAL(&realsin6->sin6_addr) && 232 IN6_IS_ADDR_LINKLOCAL(&clntsin6->sin6_addr)) { 233 if (ifsin6->sin6_scope_id != 234 realsin6->sin6_scope_id) 235 continue; 236 goto found; 237 } 238 if (!bitmaskcmp(&ifsin6->sin6_addr, 239 &clntsin6->sin6_addr, &sin6mask->sin6_addr, 240 sizeof (struct in6_addr))) 241 goto found; 242 break; 243 #endif 244 default: 245 goto freeit; 246 } 247 } 248 /* 249 * Didn't find anything. Get the first possibly useful interface, 250 * preferring "normal" interfaces to point-to-point and loopback 251 * ones. 252 */ 253 bestif = NULL; 254 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 255 if (ifap->ifa_addr->sa_family != clnt->sa_family || 256 !(ifap->ifa_flags & IFF_UP)) 257 continue; 258 if (!(ifap->ifa_flags & IFF_LOOPBACK) && 259 !(ifap->ifa_flags & IFF_POINTOPOINT)) { 260 bestif = ifap; 261 break; 262 } 263 if (bestif == NULL) 264 bestif = ifap; 265 else if ((bestif->ifa_flags & IFF_LOOPBACK) && 266 !(ifap->ifa_flags & IFF_LOOPBACK)) 267 bestif = ifap; 268 } 269 ifap = bestif; 270 found: 271 switch (clnt->sa_family) { 272 case AF_INET: 273 memcpy(newsin, ifap->ifa_addr, clnt_sa->sa_len); 274 newsin->sin_port = servsin->sin_port; 275 tbuf.len = clnt_sa->sa_len; 276 tbuf.maxlen = sizeof (struct sockaddr_storage); 277 tbuf.buf = newsin; 278 break; 279 #ifdef INET6 280 case AF_INET6: 281 memcpy(newsin6, ifsin6, clnt_sa->sa_len); 282 newsin6->sin6_port = servsin6->sin6_port; 283 tbuf.maxlen = sizeof (struct sockaddr_storage); 284 tbuf.len = clnt_sa->sa_len; 285 tbuf.buf = newsin6; 286 break; 287 #endif 288 default: 289 goto freeit; 290 } 291 if (ifap != NULL) 292 ret = taddr2uaddr(nconf, &tbuf); 293 freeit: 294 freenetconfigent(nconf); 295 free(serv_sa); 296 free(serv_nbp); 297 if (clnt_sa != NULL) 298 free(clnt_sa); 299 if (clnt_nbp != NULL) 300 free(clnt_nbp); 301 freeifaddrs(ifp); 302 303 #ifdef ND_DEBUG 304 if (debugging) 305 fprintf(stderr, "addrmerge: returning %s\n", ret); 306 #endif 307 return ret; 308 } 309 310 void 311 network_init() 312 { 313 #ifdef INET6 314 struct ifaddrs *ifap, *ifp; 315 struct ipv6_mreq mreq6; 316 int ifindex, s; 317 #endif 318 int ecode; 319 struct addrinfo hints, *res; 320 321 memset(&hints, 0, sizeof hints); 322 hints.ai_family = AF_INET; 323 if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 324 if (debugging) 325 fprintf(stderr, "can't get local ip4 address: %s\n", 326 gai_strerror(ecode)); 327 } else { 328 local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4); 329 if (local_in4 == NULL) { 330 if (debugging) 331 fprintf(stderr, "can't alloc local ip4 addr\n"); 332 } 333 memcpy(local_in4, res->ai_addr, sizeof *local_in4); 334 } 335 336 #ifdef INET6 337 hints.ai_family = AF_INET6; 338 if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 339 if (debugging) 340 fprintf(stderr, "can't get local ip6 address: %s\n", 341 gai_strerror(ecode)); 342 } else { 343 local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6); 344 if (local_in6 == NULL) { 345 if (debugging) 346 fprintf(stderr, "can't alloc local ip6 addr\n"); 347 } 348 memcpy(local_in6, res->ai_addr, sizeof *local_in6); 349 } 350 351 /* 352 * Now join the RPC ipv6 multicast group on all interfaces. 353 */ 354 if (getifaddrs(&ifp) < 0) 355 return; 356 357 mreq6.ipv6mr_interface = 0; 358 inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr); 359 360 s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 361 362 /* 363 * Loop through all interfaces. For each interface, see if the 364 * network portion of its address is equal to that of the client. 365 * If so, we have found the interface that we want to use. 366 */ 367 for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 368 if (ifap->ifa_addr->sa_family != AF_INET6 || 369 !(ifap->ifa_flags & IFF_MULTICAST)) 370 continue; 371 ifindex = if_nametoindex(ifap->ifa_name); 372 if (ifindex == mreq6.ipv6mr_interface) 373 /* 374 * Already did this one. 375 */ 376 continue; 377 mreq6.ipv6mr_interface = ifindex; 378 if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, 379 sizeof mreq6) < 0) 380 if (debugging) 381 perror("setsockopt v6 multicast"); 382 } 383 #endif 384 385 /* close(s); */ 386 } 387 388 struct sockaddr * 389 local_sa(int af) 390 { 391 switch (af) { 392 case AF_INET: 393 return (struct sockaddr *)local_in4; 394 #ifdef INET6 395 case AF_INET6: 396 return (struct sockaddr *)local_in6; 397 #endif 398 default: 399 return NULL; 400 } 401 } 402