418 lines
11 KiB
C
418 lines
11 KiB
C
/*
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* $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $
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* $FreeBSD$
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*/
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/*-
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* SPDX-License-Identifier: BSD-2-Clause-NetBSD
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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 <ifaddrs.h>
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#include <sys/poll.h>
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#include <rpc/rpc.h>
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#include <stdlib.h>
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#include <string.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(struct sockaddr *, struct sockaddr *, struct sockaddr *);
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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. Returns 0 if the addresses
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* match.
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*/
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static int
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bitmaskcmp(struct sockaddr *dst, struct sockaddr *src, struct sockaddr *mask)
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{
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int i;
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u_int8_t *p1, *p2, *netmask;
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int bytelen;
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if (dst->sa_family != src->sa_family ||
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dst->sa_family != mask->sa_family)
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return (1);
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switch (dst->sa_family) {
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case AF_INET:
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p1 = (uint8_t*) &SA2SINADDR(dst);
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p2 = (uint8_t*) &SA2SINADDR(src);
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netmask = (uint8_t*) &SA2SINADDR(mask);
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bytelen = sizeof(struct in_addr);
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break;
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#ifdef INET6
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case AF_INET6:
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p1 = (uint8_t*) &SA2SIN6ADDR(dst);
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p2 = (uint8_t*) &SA2SIN6ADDR(src);
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netmask = (uint8_t*) &SA2SIN6ADDR(mask);
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bytelen = sizeof(struct in6_addr);
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break;
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#endif
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default:
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return (1);
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}
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for (i = 0; i < bytelen; i++)
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if ((p1[i] & netmask[i]) != (p2[i] & netmask[i]))
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return (1);
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return (0);
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}
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/*
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* Find a server address that can be used by `caller' to contact
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* the local service specified by `serv_uaddr'. If `clnt_uaddr' is
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* non-NULL, it is used instead of `caller' as a hint suggesting
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* the best address (e.g. the `r_addr' field of an rpc, which
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* contains the rpcbind server address that the caller used).
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*
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* Returns the best server address as a malloc'd "universal address"
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* string which should be freed by the caller. On error, returns NULL.
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*/
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char *
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addrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr,
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const char *netid)
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{
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struct ifaddrs *ifap, *ifp = NULL, *bestif;
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struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf;
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struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa;
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struct sockaddr_storage ss;
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struct netconfig *nconf;
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char *caller_uaddr = NULL;
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#ifdef ND_DEBUG
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const char *hint_uaddr = NULL;
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#endif
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char *ret = NULL;
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int bestif_goodness;
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#ifdef ND_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 == NULL ? "NULL" : clnt_uaddr, netid);
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#endif
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caller_sa = caller->buf;
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if ((nconf = rpcbind_get_conf(netid)) == NULL)
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goto freeit;
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if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL)
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goto freeit;
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/*
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* Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its
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* address family is different from that of the caller.
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*/
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hint_sa = NULL;
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if (clnt_uaddr != NULL) {
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#ifdef ND_DEBUG
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hint_uaddr = clnt_uaddr;
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#endif
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if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL)
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goto freeit;
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hint_sa = hint_nbp->buf;
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}
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if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) {
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#ifdef ND_DEBUG
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hint_uaddr = caller_uaddr;
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#endif
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hint_sa = caller->buf;
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}
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#ifdef ND_DEBUG
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if (debugging)
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fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr);
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#endif
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/* Local caller, just return the server address. */
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if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 ||
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strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') {
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ret = strdup(serv_uaddr);
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goto freeit;
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}
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if (getifaddrs(&ifp) < 0)
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goto freeit;
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/*
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* Loop through all interface addresses. We are listening to an address
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* if any of the following are true:
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* a) It's a loopback address
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* b) It was specified with the -h command line option
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* c) There were no -h command line options.
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*
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* Among addresses on which we are listening, choose in order of
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* preference an address that is:
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*
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* a) Equal to the hint
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* b) A link local address with the same scope ID as the client's
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* address, if the client's address is also link local
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* c) An address on the same subnet as the client's address
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* d) A non-localhost, non-p2p address
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* e) Any usable address
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*/
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bestif = NULL;
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bestif_goodness = 0;
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for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
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ifsa = ifap->ifa_addr;
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ifmasksa = ifap->ifa_netmask;
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/* Skip addresses where we don't listen */
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if (ifsa == NULL || ifsa->sa_family != hint_sa->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) && !listen_addr(ifsa))
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continue;
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if ((hint_sa->sa_family == AF_INET) &&
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((((struct sockaddr_in*)hint_sa)->sin_addr.s_addr ==
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((struct sockaddr_in*)ifsa)->sin_addr.s_addr))) {
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const int goodness = 4;
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bestif_goodness = goodness;
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bestif = ifap;
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goto found;
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}
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#ifdef INET6
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if ((hint_sa->sa_family == AF_INET6) &&
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(0 == memcmp(&((struct sockaddr_in6*)hint_sa)->sin6_addr,
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&((struct sockaddr_in6*)ifsa)->sin6_addr,
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sizeof(struct in6_addr))) &&
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(((struct sockaddr_in6*)hint_sa)->sin6_scope_id ==
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(((struct sockaddr_in6*)ifsa)->sin6_scope_id))) {
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const int goodness = 4;
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bestif_goodness = goodness;
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bestif = ifap;
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goto found;
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}
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if (hint_sa->sa_family == AF_INET6) {
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/*
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* For v6 link local addresses, if the caller is on
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* a link-local address then use the scope id to see
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* which one.
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*/
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if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) &&
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IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) &&
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IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) {
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if (SA2SIN6(ifsa)->sin6_scope_id ==
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SA2SIN6(caller_sa)->sin6_scope_id) {
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const int goodness = 3;
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if (bestif_goodness < goodness) {
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bestif = ifap;
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bestif_goodness = goodness;
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}
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}
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}
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}
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#endif /* INET6 */
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if (0 == bitmaskcmp(hint_sa, ifsa, ifmasksa)) {
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const int goodness = 2;
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if (bestif_goodness < goodness) {
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bestif = ifap;
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bestif_goodness = goodness;
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}
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}
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if (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
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const int goodness = 1;
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if (bestif_goodness < goodness) {
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bestif = ifap;
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bestif_goodness = goodness;
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}
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}
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if (bestif == NULL)
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bestif = ifap;
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}
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if (bestif == NULL)
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goto freeit;
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found:
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/*
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* Construct the new address using the address from
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* `bestif', and the port number from `serv_uaddr'.
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*/
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serv_nbp = uaddr2taddr(nconf, serv_uaddr);
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if (serv_nbp == NULL)
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goto freeit;
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serv_sa = serv_nbp->buf;
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memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len);
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switch (ss.ss_family) {
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case AF_INET:
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SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port;
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break;
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#ifdef INET6
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case AF_INET6:
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SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port;
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break;
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#endif
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}
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tbuf.len = ss.ss_len;
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tbuf.maxlen = sizeof(ss);
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tbuf.buf = &ss;
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ret = taddr2uaddr(nconf, &tbuf);
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freeit:
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free(caller_uaddr);
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if (hint_nbp != NULL) {
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free(hint_nbp->buf);
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free(hint_nbp);
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}
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if (serv_nbp != NULL) {
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free(serv_nbp->buf);
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free(serv_nbp);
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}
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if (ifp != NULL)
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freeifaddrs(ifp);
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#ifdef ND_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(void)
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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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exit(1);
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}
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memcpy(local_in4, res->ai_addr, sizeof *local_in4);
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freeaddrinfo(res);
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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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exit(1);
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}
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memcpy(local_in6, res->ai_addr, sizeof *local_in6);
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freeaddrinfo(res);
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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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if (s == -1) {
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if (debugging)
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fprintf(stderr, "couldn't create ip6 socket");
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goto done_inet6;
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}
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/*
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* Loop through all interfaces. For each IPv6 multicast-capable
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* interface, join the RPC multicast group on that interface.
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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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done_inet6:
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freeifaddrs(ifp);
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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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