400 lines
11 KiB
C
400 lines
11 KiB
C
/* $NetBSD: util.c,v 1.16 2009/01/18 10:17:38 lukem Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Frank van der Linden.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/queue.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <assert.h>
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#include <ifaddrs.h>
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#include <poll.h>
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#include <rpc/rpc.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <netconfig.h>
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#include <stdio.h>
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#include <arpa/inet.h>
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#include "rpcbind.h"
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static struct sockaddr_in *local_in4;
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#ifdef INET6
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static struct sockaddr_in6 *local_in6;
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#endif
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static int bitmaskcmp(void *, void *, void *, int);
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#ifdef INET6
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static void in6_fillscopeid(struct sockaddr_in6 *);
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#endif
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/*
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* For all bits set in "mask", compare the corresponding bits in
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* "dst" and "src", and see if they match.
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*/
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static int
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bitmaskcmp(void *dst, void *src, void *mask, int bytelen)
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{
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int i, j;
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u_int8_t *p1 = dst, *p2 = src, *netmask = mask;
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u_int8_t bitmask;
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for (i = 0; i < bytelen; i++) {
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for (j = 0; j < 8; j++) {
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bitmask = 1 << j;
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if (!(netmask[i] & bitmask))
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continue;
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if ((p1[i] & bitmask) != (p2[i] & bitmask))
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return 1;
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}
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}
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return 0;
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}
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/*
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* Taken from ifconfig.c
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*/
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#ifdef INET6
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static void
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in6_fillscopeid(struct sockaddr_in6 *sin6)
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{
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if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
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sin6->sin6_scope_id =
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ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
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sin6->sin6_addr.s6_addr[2] = sin6->sin6_addr.s6_addr[3] = 0;
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}
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}
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#endif
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char *
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addrmerge(struct netbuf *caller, char *serv_uaddr, char *clnt_uaddr,
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char *netid)
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{
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struct ifaddrs *ifap, *ifp, *bestif;
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#ifdef INET6
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struct sockaddr_in6 *servsin6, *sin6mask, *clntsin6, *ifsin6, *realsin6;
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struct sockaddr_in6 *newsin6;
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#endif
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struct sockaddr_in *servsin, *sinmask, *clntsin, *newsin, *ifsin;
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struct netbuf *serv_nbp, *clnt_nbp = NULL, tbuf;
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struct sockaddr *serv_sa;
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struct sockaddr *clnt_sa;
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struct sockaddr_storage ss;
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struct netconfig *nconf;
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struct sockaddr *clnt = caller->buf;
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char *ret = NULL;
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#ifdef INET6
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servsin6 = ifsin6 = newsin6 = NULL; /* XXXGCC -Wuninitialized */
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#endif
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servsin = newsin = NULL; /* XXXGCC -Wuninitialized */
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#ifdef RPCBIND_DEBUG
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if (debugging)
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fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr,
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clnt_uaddr, netid);
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#endif
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nconf = getnetconfigent(netid);
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if (nconf == NULL)
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return NULL;
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/*
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* Local merge, just return a duplicate.
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*/
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if (clnt_uaddr != NULL && strncmp(clnt_uaddr, "0.0.0.0.", 8) == 0)
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return strdup(clnt_uaddr);
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serv_nbp = uaddr2taddr(nconf, serv_uaddr);
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if (serv_nbp == NULL)
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return NULL;
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serv_sa = (struct sockaddr *)serv_nbp->buf;
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if (clnt_uaddr != NULL) {
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clnt_nbp = uaddr2taddr(nconf, clnt_uaddr);
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if (clnt_nbp == NULL) {
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free(serv_nbp);
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return NULL;
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}
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clnt_sa = (struct sockaddr *)clnt_nbp->buf;
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if (clnt_sa->sa_family == AF_LOCAL) {
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free(serv_nbp);
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free(clnt_nbp);
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free(clnt_sa);
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return strdup(serv_uaddr);
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}
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} else {
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clnt_sa = (struct sockaddr *)
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malloc(sizeof (struct sockaddr_storage));
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memcpy(clnt_sa, clnt, clnt->sa_len);
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}
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if (getifaddrs(&ifp) < 0) {
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free(serv_nbp);
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free(clnt_sa);
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if (clnt_nbp != NULL)
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free(clnt_nbp);
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return 0;
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}
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/*
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* Loop through all interfaces. For each interface, see if the
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* network portion of its address is equal to that of the client.
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* If so, we have found the interface that we want to use.
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*/
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for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
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if (ifap->ifa_addr->sa_family != clnt->sa_family ||
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!(ifap->ifa_flags & IFF_UP))
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continue;
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switch (clnt->sa_family) {
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case AF_INET:
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/*
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* realsin: address that recvfrom gave us.
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* ifsin: address of interface being examined.
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* clntsin: address that client want us to contact
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* it on
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* servsin: local address of RPC service.
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* sinmask: netmask of this interface
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* newsin: initially a copy of clntsin, eventually
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* the merged address
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*/
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servsin = (struct sockaddr_in *)serv_sa;
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clntsin = (struct sockaddr_in *)clnt_sa;
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sinmask = (struct sockaddr_in *)ifap->ifa_netmask;
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newsin = (struct sockaddr_in *)&ss;
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ifsin = (struct sockaddr_in *)ifap->ifa_addr;
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if (!bitmaskcmp(&ifsin->sin_addr, &clntsin->sin_addr,
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&sinmask->sin_addr, sizeof (struct in_addr))) {
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goto found;
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}
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break;
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#ifdef INET6
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case AF_INET6:
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/*
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* realsin6: address that recvfrom gave us.
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* ifsin6: address of interface being examined.
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* clntsin6: address that client want us to contact
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* it on
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* servsin6: local address of RPC service.
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* sin6mask: netmask of this interface
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* newsin6: initially a copy of clntsin, eventually
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* the merged address
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*
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* For v6 link local addresses, if the client contacted
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* us via a link-local address, and wants us to reply
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* to one, use the scope id to see which one.
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*/
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realsin6 = (struct sockaddr_in6 *)clnt;
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ifsin6 = (struct sockaddr_in6 *)ifap->ifa_addr;
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in6_fillscopeid(ifsin6);
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clntsin6 = (struct sockaddr_in6 *)clnt_sa;
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servsin6 = (struct sockaddr_in6 *)serv_sa;
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sin6mask = (struct sockaddr_in6 *)ifap->ifa_netmask;
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newsin6 = (struct sockaddr_in6 *)&ss;
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if (IN6_IS_ADDR_LINKLOCAL(&ifsin6->sin6_addr) &&
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IN6_IS_ADDR_LINKLOCAL(&realsin6->sin6_addr) &&
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IN6_IS_ADDR_LINKLOCAL(&clntsin6->sin6_addr)) {
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if (ifsin6->sin6_scope_id !=
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realsin6->sin6_scope_id)
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continue;
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goto found;
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}
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if (!bitmaskcmp(&ifsin6->sin6_addr,
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&clntsin6->sin6_addr, &sin6mask->sin6_addr,
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sizeof (struct in6_addr)))
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goto found;
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break;
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#endif
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default:
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goto freeit;
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}
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}
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/*
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* Didn't find anything. Get the first possibly useful interface,
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* preferring "normal" interfaces to point-to-point and loopback
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* ones.
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*/
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bestif = NULL;
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for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
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if (ifap->ifa_addr->sa_family != clnt->sa_family ||
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!(ifap->ifa_flags & IFF_UP))
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continue;
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if (!(ifap->ifa_flags & IFF_LOOPBACK) &&
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!(ifap->ifa_flags & IFF_POINTOPOINT)) {
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bestif = ifap;
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break;
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}
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if (bestif == NULL)
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bestif = ifap;
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else if ((bestif->ifa_flags & IFF_LOOPBACK) &&
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!(ifap->ifa_flags & IFF_LOOPBACK))
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bestif = ifap;
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}
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ifap = bestif;
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found:
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switch (clnt->sa_family) {
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case AF_INET:
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memcpy(newsin, ifap->ifa_addr, clnt_sa->sa_len);
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newsin->sin_port = servsin->sin_port;
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tbuf.len = clnt_sa->sa_len;
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tbuf.maxlen = sizeof (struct sockaddr_storage);
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tbuf.buf = newsin;
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break;
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#ifdef INET6
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case AF_INET6:
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assert(newsin6);
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memcpy(newsin6, ifsin6, clnt_sa->sa_len);
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newsin6->sin6_port = servsin6->sin6_port;
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tbuf.maxlen = sizeof (struct sockaddr_storage);
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tbuf.len = clnt_sa->sa_len;
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tbuf.buf = newsin6;
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break;
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#endif
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default:
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goto freeit;
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}
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if (ifap != NULL)
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ret = taddr2uaddr(nconf, &tbuf);
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freeit:
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freenetconfigent(nconf);
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free(serv_sa);
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free(serv_nbp);
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if (clnt_sa != NULL)
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free(clnt_sa);
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if (clnt_nbp != NULL)
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free(clnt_nbp);
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freeifaddrs(ifp);
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#ifdef RPCBIND_DEBUG
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if (debugging)
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fprintf(stderr, "addrmerge: returning %s\n", ret);
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#endif
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return ret;
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}
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void
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network_init()
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{
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#ifdef INET6
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struct ifaddrs *ifap, *ifp;
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struct ipv6_mreq mreq6;
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unsigned int ifindex;
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int s;
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#endif
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int ecode;
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struct addrinfo hints, *res;
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memset(&hints, 0, sizeof hints);
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hints.ai_family = AF_INET;
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if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) {
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if (debugging)
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fprintf(stderr, "can't get local ip4 address: %s\n",
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gai_strerror(ecode));
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} else {
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local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4);
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if (local_in4 == NULL) {
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if (debugging)
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fprintf(stderr, "can't alloc local ip4 addr\n");
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}
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memcpy(local_in4, res->ai_addr, sizeof *local_in4);
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}
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#ifdef INET6
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hints.ai_family = AF_INET6;
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if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) {
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if (debugging)
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fprintf(stderr, "can't get local ip6 address: %s\n",
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gai_strerror(ecode));
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} else {
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local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6);
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if (local_in6 == NULL) {
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if (debugging)
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fprintf(stderr, "can't alloc local ip6 addr\n");
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}
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memcpy(local_in6, res->ai_addr, sizeof *local_in6);
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}
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/*
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* Now join the RPC ipv6 multicast group on all interfaces.
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*/
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if (getifaddrs(&ifp) < 0)
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return;
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mreq6.ipv6mr_interface = 0;
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inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr);
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s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
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/*
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* Loop through all interfaces. For each interface, see if the
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* network portion of its address is equal to that of the client.
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* If so, we have found the interface that we want to use.
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*/
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for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
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if (ifap->ifa_addr->sa_family != AF_INET6 ||
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!(ifap->ifa_flags & IFF_MULTICAST))
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continue;
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ifindex = if_nametoindex(ifap->ifa_name);
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if (ifindex == mreq6.ipv6mr_interface)
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/*
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* Already did this one.
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*/
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continue;
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mreq6.ipv6mr_interface = ifindex;
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if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6,
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sizeof mreq6) < 0)
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if (debugging)
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perror("setsockopt v6 multicast");
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}
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#endif
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/* close(s); */
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}
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struct sockaddr *
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local_sa(int af)
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{
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switch (af) {
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case AF_INET:
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return (struct sockaddr *)local_in4;
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#ifdef INET6
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case AF_INET6:
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return (struct sockaddr *)local_in6;
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#endif
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default:
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return NULL;
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}
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}
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