/* * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $ * $FreeBSD$ */ /*- * Copyright (c) 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Frank van der Linden. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "rpcbind.h" static struct sockaddr_in *local_in4; #ifdef INET6 static struct sockaddr_in6 *local_in6; #endif static int bitmaskcmp(void *, void *, void *, int); #ifdef INET6 static void in6_fillscopeid(struct sockaddr_in6 *); #endif /* * For all bits set in "mask", compare the corresponding bits in * "dst" and "src", and see if they match. Returns 0 if the addresses * match. */ static int bitmaskcmp(void *dst, void *src, void *mask, int bytelen) { int i; u_int8_t *p1 = dst, *p2 = src, *netmask = mask; for (i = 0; i < bytelen; i++) if ((p1[i] & netmask[i]) != (p2[i] & netmask[i])) return (1); return (0); } /* * Similar to code in ifconfig.c. Fill in the scope ID for link-local * addresses returned by getifaddrs(). */ #ifdef INET6 static void in6_fillscopeid(struct sockaddr_in6 *sin6) { u_int16_t ifindex; if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { ifindex = ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]); if (sin6->sin6_scope_id == 0 && ifindex != 0) { sin6->sin6_scope_id = ifindex; *(u_int16_t *)&sin6->sin6_addr.s6_addr[2] = 0; } } } #endif /* * Find a server address that can be used by `caller' to contact * the local service specified by `serv_uaddr'. If `clnt_uaddr' is * non-NULL, it is used instead of `caller' as a hint suggesting * the best address (e.g. the `r_addr' field of an rpc, which * contains the rpcbind server address that the caller used). * * Returns the best server address as a malloc'd "universal address" * string which should be freed by the caller. On error, returns NULL. */ char * addrmerge(struct netbuf *caller, char *serv_uaddr, char *clnt_uaddr, char *netid) { struct ifaddrs *ifap, *ifp = NULL, *bestif; struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf; struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa; struct sockaddr_storage ss; struct netconfig *nconf; char *caller_uaddr = NULL, *hint_uaddr = NULL; char *ret = NULL; #ifdef ND_DEBUG if (debugging) fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid); #endif caller_sa = caller->buf; if ((nconf = rpcbind_get_conf(netid)) == NULL) goto freeit; if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL) goto freeit; /* * Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its * address family is different from that of the caller. */ hint_sa = NULL; if (clnt_uaddr != NULL) { hint_uaddr = clnt_uaddr; if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL) goto freeit; hint_sa = hint_nbp->buf; } if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) { hint_uaddr = caller_uaddr; hint_sa = caller->buf; } #ifdef ND_DEBUG if (debugging) fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr); #endif /* Local caller, just return the server address. */ if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 || strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') { ret = strdup(serv_uaddr); goto freeit; } if (getifaddrs(&ifp) < 0) goto freeit; /* * Loop through all interfaces. For each interface, see if it * is either the loopback interface (which we always listen * on) or is one of the addresses the program bound to (the * wildcard by default, or a subset if -h is specified) and * the network portion of its address is equal to that of the * client. If so, we have found the interface that we want to * use. */ bestif = NULL; for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { ifsa = ifap->ifa_addr; ifmasksa = ifap->ifa_netmask; if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family || !(ifap->ifa_flags & IFF_UP)) continue; if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa)) continue; switch (hint_sa->sa_family) { case AF_INET: /* * If the hint address matches this interface * address/netmask, then we're done. */ if (!bitmaskcmp(&SA2SINADDR(ifsa), &SA2SINADDR(hint_sa), &SA2SINADDR(ifmasksa), sizeof(struct in_addr))) { bestif = ifap; goto found; } break; #ifdef INET6 case AF_INET6: /* * For v6 link local addresses, if the caller is on * a link-local address then use the scope id to see * which one. */ in6_fillscopeid(SA2SIN6(ifsa)); if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) && IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) && IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) { if (SA2SIN6(ifsa)->sin6_scope_id == SA2SIN6(caller_sa)->sin6_scope_id) { bestif = ifap; goto found; } } else if (!bitmaskcmp(&SA2SIN6ADDR(ifsa), &SA2SIN6ADDR(hint_sa), &SA2SIN6ADDR(ifmasksa), sizeof(struct in6_addr))) { bestif = ifap; goto found; } break; #endif default: continue; } /* * Remember the first possibly useful interface, preferring * "normal" to point-to-point and loopback ones. */ if (bestif == NULL || (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) && (bestif->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)))) bestif = ifap; } if (bestif == NULL) goto freeit; found: /* * Construct the new address using the address from * `bestif', and the port number from `serv_uaddr'. */ serv_nbp = uaddr2taddr(nconf, serv_uaddr); if (serv_nbp == NULL) goto freeit; serv_sa = serv_nbp->buf; memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len); switch (ss.ss_family) { case AF_INET: SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port; break; #ifdef INET6 case AF_INET6: SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port; break; #endif } tbuf.len = ss.ss_len; tbuf.maxlen = sizeof(ss); tbuf.buf = &ss; ret = taddr2uaddr(nconf, &tbuf); freeit: if (caller_uaddr != NULL) free(caller_uaddr); if (hint_nbp != NULL) { free(hint_nbp->buf); free(hint_nbp); } if (serv_nbp != NULL) { free(serv_nbp->buf); free(serv_nbp); } if (ifp != NULL) freeifaddrs(ifp); #ifdef ND_DEBUG if (debugging) fprintf(stderr, "addrmerge: returning %s\n", ret); #endif return ret; } void network_init() { #ifdef INET6 struct ifaddrs *ifap, *ifp; struct ipv6_mreq mreq6; unsigned int ifindex; int s; #endif int ecode; struct addrinfo hints, *res; memset(&hints, 0, sizeof hints); hints.ai_family = AF_INET; if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { if (debugging) fprintf(stderr, "can't get local ip4 address: %s\n", gai_strerror(ecode)); } else { local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4); if (local_in4 == NULL) { if (debugging) fprintf(stderr, "can't alloc local ip4 addr\n"); } memcpy(local_in4, res->ai_addr, sizeof *local_in4); } #ifdef INET6 hints.ai_family = AF_INET6; if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { if (debugging) fprintf(stderr, "can't get local ip6 address: %s\n", gai_strerror(ecode)); } else { local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6); if (local_in6 == NULL) { if (debugging) fprintf(stderr, "can't alloc local ip6 addr\n"); } memcpy(local_in6, res->ai_addr, sizeof *local_in6); } /* * Now join the RPC ipv6 multicast group on all interfaces. */ if (getifaddrs(&ifp) < 0) return; mreq6.ipv6mr_interface = 0; inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr); s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); /* * Loop through all interfaces. For each IPv6 multicast-capable * interface, join the RPC multicast group on that interface. */ for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { if (ifap->ifa_addr->sa_family != AF_INET6 || !(ifap->ifa_flags & IFF_MULTICAST)) continue; ifindex = if_nametoindex(ifap->ifa_name); if (ifindex == mreq6.ipv6mr_interface) /* * Already did this one. */ continue; mreq6.ipv6mr_interface = ifindex; if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, sizeof mreq6) < 0) if (debugging) perror("setsockopt v6 multicast"); } #endif /* close(s); */ } struct sockaddr * local_sa(int af) { switch (af) { case AF_INET: return (struct sockaddr *)local_in4; #ifdef INET6 case AF_INET6: return (struct sockaddr *)local_in6; #endif default: return NULL; } }