diff options
Diffstat (limited to 'usr.sbin/rpcbind/util.c')
| -rw-r--r-- | usr.sbin/rpcbind/util.c | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/usr.sbin/rpcbind/util.c b/usr.sbin/rpcbind/util.c new file mode 100644 index 0000000..bf20019 --- /dev/null +++ b/usr.sbin/rpcbind/util.c @@ -0,0 +1,381 @@ +/* + * $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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the NetBSD + * Foundation, Inc. and its contributors. + * 4. Neither the name of The NetBSD Foundation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * 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 <sys/types.h> +#include <sys/socket.h> +#include <sys/queue.h> +#include <net/if.h> +#include <netinet/in.h> +#include <ifaddrs.h> +#include <sys/poll.h> +#include <rpc/rpc.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <netdb.h> +#include <netconfig.h> +#include <stdio.h> +#include <arpa/inet.h> + +#include "rpcbind.h" + +static struct sockaddr_in *local_in4; +#ifdef INET6 +static struct sockaddr_in6 *local_in6; +#endif + +static int bitmaskcmp __P((void *, void *, void *, int)); +#ifdef INET6 +static void in6_fillscopeid __P((struct sockaddr_in6 *)); +#endif + +/* + * For all bits set in "mask", compare the corresponding bits in + * "dst" and "src", and see if they match. + */ +static int +bitmaskcmp(void *dst, void *src, void *mask, int bytelen) +{ + int i, j; + u_int8_t *p1 = dst, *p2 = src, *netmask = mask; + u_int8_t bitmask; + + for (i = 0; i < bytelen; i++) { + for (j = 0; j < 8; j++) { + bitmask = 1 << j; + if (!(netmask[i] & bitmask)) + continue; + if ((p1[i] & bitmask) != (p2[i] & bitmask)) + return 1; + } + } + + return 0; +} + +/* + * Taken from ifconfig.c + */ +#ifdef INET6 +static void +in6_fillscopeid(struct sockaddr_in6 *sin6) +{ + if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) { + sin6->sin6_scope_id = + ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]); + sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0; + } +} +#endif + +char * +addrmerge(struct netbuf *caller, char *serv_uaddr, char *clnt_uaddr, + char *netid) +{ + struct ifaddrs *ifap, *ifp, *bestif; +#ifdef INET6 + struct sockaddr_in6 *servsin6, *sin6mask, *clntsin6, *ifsin6, *realsin6; + struct sockaddr_in6 *newsin6; +#endif + struct sockaddr_in *servsin, *sinmask, *clntsin, *newsin, *ifsin; + struct netbuf *serv_nbp, *clnt_nbp = NULL, tbuf; + struct sockaddr *serv_sa; + struct sockaddr *clnt_sa; + struct sockaddr_storage ss; + struct netconfig *nconf; + struct sockaddr *clnt = caller->buf; + char *ret = NULL; + +#ifdef ND_DEBUG + if (debugging) + fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, + clnt_uaddr, netid); +#endif + nconf = getnetconfigent(netid); + if (nconf == NULL) + return NULL; + + /* + * Local merge, just return a duplicate. + */ + if (clnt_uaddr != NULL && strncmp(clnt_uaddr, "0.0.0.0.", 8) == 0) + return strdup(clnt_uaddr); + + serv_nbp = uaddr2taddr(nconf, serv_uaddr); + if (serv_nbp == NULL) + return NULL; + + serv_sa = (struct sockaddr *)serv_nbp->buf; + if (clnt_uaddr != NULL) { + clnt_nbp = uaddr2taddr(nconf, clnt_uaddr); + clnt_sa = (struct sockaddr *)clnt_nbp->buf; + } else { + clnt_sa = (struct sockaddr *) + malloc(sizeof (struct sockaddr_storage)); + memcpy(clnt_sa, clnt, clnt->sa_len); + } + + if (getifaddrs(&ifp) < 0) + return 0; + + /* + * Loop through all interfaces. For each interface, see if 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. + */ + for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { + if (ifap->ifa_addr->sa_family != clnt->sa_family || + !(ifap->ifa_flags & IFF_UP)) + continue; + + switch (clnt->sa_family) { + case AF_INET: + /* + * realsin: address that recvfrom gave us. + * ifsin: address of interface being examined. + * clntsin: address that client want us to contact + * it on + * servsin: local address of RPC service. + * sinmask: netmask of this interface + * newsin: initially a copy of clntsin, eventually + * the merged address + */ + servsin = (struct sockaddr_in *)serv_sa; + clntsin = (struct sockaddr_in *)clnt_sa; + sinmask = (struct sockaddr_in *)ifap->ifa_netmask; + newsin = (struct sockaddr_in *)&ss; + ifsin = (struct sockaddr_in *)ifap->ifa_addr; + if (!bitmaskcmp(&ifsin->sin_addr, &clntsin->sin_addr, + &sinmask->sin_addr, sizeof (struct in_addr))) { + /* + * Found it. + */ + memcpy(newsin, ifap->ifa_addr, + clnt_sa->sa_len); + newsin->sin_port = servsin->sin_port; + tbuf.len = clnt_sa->sa_len; + tbuf.maxlen = sizeof (struct sockaddr_storage); + tbuf.buf = newsin; + goto found; + } + break; +#ifdef INET6 + case AF_INET6: + /* + * realsin6: address that recvfrom gave us. + * ifsin6: address of interface being examined. + * clntsin6: address that client want us to contact + * it on + * servsin6: local address of RPC service. + * sin6mask: netmask of this interface + * newsin6: initially a copy of clntsin, eventually + * the merged address + * + * For v6 link local addresses, if the client contacted + * us via a link-local address, and wants us to reply + * to one, use the scope id to see which one. + */ + realsin6 = (struct sockaddr_in6 *)clnt; + ifsin6 = (struct sockaddr_in6 *)ifap->ifa_addr; + in6_fillscopeid(ifsin6); + clntsin6 = (struct sockaddr_in6 *)clnt_sa; + servsin6 = (struct sockaddr_in6 *)serv_sa; + sin6mask = (struct sockaddr_in6 *)ifap->ifa_netmask; + newsin6 = (struct sockaddr_in6 *)&ss; + if (IN6_IS_ADDR_LINKLOCAL(&ifsin6->sin6_addr) && + IN6_IS_ADDR_LINKLOCAL(&realsin6->sin6_addr) && + IN6_IS_ADDR_LINKLOCAL(&clntsin6->sin6_addr)) { + if (ifsin6->sin6_scope_id != + realsin6->sin6_scope_id) + continue; +match: + memcpy(newsin6, ifsin6, clnt_sa->sa_len); + newsin6->sin6_port = servsin6->sin6_port; + tbuf.maxlen = sizeof (struct sockaddr_storage); + tbuf.len = clnt_sa->sa_len; + tbuf.buf = newsin6; + goto found; + } + if (!bitmaskcmp(&ifsin6->sin6_addr, + &clntsin6->sin6_addr, &sin6mask->sin6_addr, + sizeof (struct in6_addr))) + goto match; + break; +#endif + default: + goto freeit; + } + } + /* + * Didn't find anything. Get the first possibly useful interface, + * preferring "normal" interfaces to point-to-point and loopback + * ones. + */ + bestif = NULL; + for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { + if (ifap->ifa_addr->sa_family != clnt->sa_family || + !(ifap->ifa_flags & IFF_UP)) + continue; + if (!(ifap->ifa_flags & IFF_LOOPBACK) && + !(ifap->ifa_flags & IFF_POINTOPOINT)) { + bestif = ifap; + break; + } + if (bestif == NULL) + bestif = ifap; + else if ((bestif->ifa_flags & IFF_LOOPBACK) && + !(ifap->ifa_flags & IFF_LOOPBACK)) + bestif = ifap; + } + ifap = bestif; +found: + if (ifap != NULL) + ret = taddr2uaddr(nconf, &tbuf); +freeit: + freenetconfigent(nconf); + free(serv_sa); + free(serv_nbp); + if (clnt_sa != NULL) + free(clnt_sa); + if (clnt_nbp != NULL) + free(clnt_nbp); + 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; + int ifindex, 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 interface, see if 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. + */ + 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; + } +} |
