673 lines
18 KiB
C
673 lines
18 KiB
C
/* $NetBSD: clnt_bcast.c,v 1.3 2000/07/06 03:05:20 christos Exp $ */
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/*-
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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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 are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* 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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/*
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* Copyright (c) 1986-1991 by Sun Microsystems Inc.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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#ident "@(#)clnt_bcast.c 1.18 94/05/03 SMI"
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static char sccsid[] = "@(#)clnt_bcast.c 1.15 89/04/21 Copyr 1988 Sun Micro";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* clnt_bcast.c
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* Client interface to broadcast service.
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*
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* Copyright (C) 1988, Sun Microsystems, Inc.
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*
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* The following is kludged-up support for simple rpc broadcasts.
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* Someday a large, complicated system will replace these routines.
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*/
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#include "namespace.h"
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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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#ifdef PORTMAP
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#include <rpc/pmap_prot.h>
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#include <rpc/pmap_clnt.h>
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#include <rpc/pmap_rmt.h>
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#endif /* PORTMAP */
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#include <rpc/nettype.h>
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#include <arpa/inet.h>
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#ifdef RPC_DEBUG
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#include <stdio.h>
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <err.h>
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#include <string.h>
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#include "un-namespace.h"
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#include "rpc_com.h"
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#define MAXBCAST 20 /* Max no of broadcasting transports */
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#define INITTIME 4000 /* Time to wait initially */
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#define WAITTIME 8000 /* Maximum time to wait */
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/*
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* If nettype is NULL, it broadcasts on all the available
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* datagram_n transports. May potentially lead to broadacst storms
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* and hence should be used with caution, care and courage.
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*
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* The current parameter xdr packet size is limited by the max tsdu
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* size of the transport. If the max tsdu size of any transport is
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* smaller than the parameter xdr packet, then broadcast is not
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* sent on that transport.
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*
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* Also, the packet size should be less the packet size of
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* the data link layer (for ethernet it is 1400 bytes). There is
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* no easy way to find out the max size of the data link layer and
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* we are assuming that the args would be smaller than that.
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*
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* The result size has to be smaller than the transport tsdu size.
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*
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* If PORTMAP has been defined, we send two packets for UDP, one for
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* rpcbind and one for portmap. For those machines which support
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* both rpcbind and portmap, it will cause them to reply twice, and
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* also here it will get two responses ... inefficient and clumsy.
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*/
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struct broadif {
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int index;
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struct sockaddr_storage broadaddr;
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TAILQ_ENTRY(broadif) link;
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};
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typedef TAILQ_HEAD(, broadif) broadlist_t;
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int __rpc_getbroadifs(int, int, int, broadlist_t *);
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void __rpc_freebroadifs(broadlist_t *);
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int __rpc_broadenable(int, int, struct broadif *);
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int __rpc_lowvers = 0;
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int
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__rpc_getbroadifs(int af, int proto, int socktype, broadlist_t *list)
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{
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int count = 0;
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struct broadif *bip;
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struct ifaddrs *ifap, *ifp;
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#ifdef INET6
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struct sockaddr_in6 *sin6;
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#endif
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struct sockaddr_in *sin;
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struct addrinfo hints, *res;
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if (getifaddrs(&ifp) < 0)
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return 0;
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memset(&hints, 0, sizeof hints);
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hints.ai_family = af;
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hints.ai_protocol = proto;
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hints.ai_socktype = socktype;
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if (getaddrinfo(NULL, "sunrpc", &hints, &res) != 0) {
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freeifaddrs(ifp);
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return 0;
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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 ||
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!(ifap->ifa_flags & IFF_UP))
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continue;
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bip = (struct broadif *)malloc(sizeof *bip);
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if (bip == NULL)
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break;
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bip->index = if_nametoindex(ifap->ifa_name);
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if (
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#ifdef INET6
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af != AF_INET6 &&
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#endif
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(ifap->ifa_flags & IFF_BROADCAST) &&
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ifap->ifa_broadaddr) {
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memcpy(&bip->broadaddr, ifap->ifa_broadaddr,
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(size_t)ifap->ifa_broadaddr->sa_len);
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sin = (struct sockaddr_in *)(void *)&bip->broadaddr;
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sin->sin_port =
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((struct sockaddr_in *)
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(void *)res->ai_addr)->sin_port;
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} else
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#ifdef INET6
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if (af == AF_INET6 && (ifap->ifa_flags & IFF_MULTICAST)) {
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sin6 = (struct sockaddr_in6 *)(void *)&bip->broadaddr;
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inet_pton(af, RPCB_MULTICAST_ADDR, &sin6->sin6_addr);
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sin6->sin6_family = af;
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sin6->sin6_len = sizeof *sin6;
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sin6->sin6_port =
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((struct sockaddr_in6 *)
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(void *)res->ai_addr)->sin6_port;
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sin6->sin6_scope_id = bip->index;
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} else
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#endif
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{
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free(bip);
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continue;
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}
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TAILQ_INSERT_TAIL(list, bip, link);
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count++;
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}
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freeifaddrs(ifp);
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freeaddrinfo(res);
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return count;
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}
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void
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__rpc_freebroadifs(broadlist_t *list)
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{
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struct broadif *bip, *next;
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bip = TAILQ_FIRST(list);
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while (bip != NULL) {
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next = TAILQ_NEXT(bip, link);
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free(bip);
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bip = next;
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}
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}
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int
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/*ARGSUSED*/
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__rpc_broadenable(int af, int s, struct broadif *bip)
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{
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int o = 1;
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#if 0
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if (af == AF_INET6) {
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fprintf(stderr, "set v6 multicast if to %d\n", bip->index);
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if (_setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, &bip->index,
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sizeof bip->index) < 0)
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return -1;
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} else
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#endif
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if (_setsockopt(s, SOL_SOCKET, SO_BROADCAST, &o, sizeof o) < 0)
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return -1;
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return 0;
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}
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enum clnt_stat
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rpc_broadcast_exp(prog, vers, proc, xargs, argsp, xresults, resultsp,
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eachresult, inittime, waittime, nettype)
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rpcprog_t prog; /* program number */
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rpcvers_t vers; /* version number */
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rpcproc_t proc; /* procedure number */
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xdrproc_t xargs; /* xdr routine for args */
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caddr_t argsp; /* pointer to args */
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xdrproc_t xresults; /* xdr routine for results */
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caddr_t resultsp; /* pointer to results */
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resultproc_t eachresult; /* call with each result obtained */
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int inittime; /* how long to wait initially */
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int waittime; /* maximum time to wait */
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const char *nettype; /* transport type */
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{
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enum clnt_stat stat = RPC_SUCCESS; /* Return status */
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XDR xdr_stream; /* XDR stream */
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XDR *xdrs = &xdr_stream;
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struct rpc_msg msg; /* RPC message */
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struct timeval t;
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char *outbuf = NULL; /* Broadcast msg buffer */
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char *inbuf = NULL; /* Reply buf */
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int inlen;
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u_int maxbufsize = 0;
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AUTH *sys_auth = authunix_create_default();
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int i;
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void *handle;
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char uaddress[1024]; /* A self imposed limit */
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char *uaddrp = uaddress;
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int pmap_reply_flag; /* reply recvd from PORTMAP */
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/* An array of all the suitable broadcast transports */
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struct {
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int fd; /* File descriptor */
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int af;
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int proto;
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struct netconfig *nconf; /* Netconfig structure */
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u_int asize; /* Size of the addr buf */
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u_int dsize; /* Size of the data buf */
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struct sockaddr_storage raddr; /* Remote address */
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broadlist_t nal;
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} fdlist[MAXBCAST];
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struct pollfd pfd[MAXBCAST];
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size_t fdlistno = 0;
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struct r_rpcb_rmtcallargs barg; /* Remote arguments */
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struct r_rpcb_rmtcallres bres; /* Remote results */
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size_t outlen;
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struct netconfig *nconf;
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int msec;
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int pollretval;
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int fds_found;
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#ifdef PORTMAP
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size_t outlen_pmap = 0;
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u_long port; /* Remote port number */
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int pmap_flag = 0; /* UDP exists ? */
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char *outbuf_pmap = NULL;
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struct rmtcallargs barg_pmap; /* Remote arguments */
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struct rmtcallres bres_pmap; /* Remote results */
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u_int udpbufsz = 0;
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#endif /* PORTMAP */
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if (sys_auth == NULL) {
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return (RPC_SYSTEMERROR);
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}
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/*
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* initialization: create a fd, a broadcast address, and send the
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* request on the broadcast transport.
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* Listen on all of them and on replies, call the user supplied
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* function.
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*/
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if (nettype == NULL)
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nettype = "datagram_n";
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if ((handle = __rpc_setconf(nettype)) == NULL) {
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AUTH_DESTROY(sys_auth);
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return (RPC_UNKNOWNPROTO);
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}
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while ((nconf = __rpc_getconf(handle)) != NULL) {
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int fd;
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struct __rpc_sockinfo si;
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if (nconf->nc_semantics != NC_TPI_CLTS)
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continue;
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if (fdlistno >= MAXBCAST)
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break; /* No more slots available */
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if (!__rpc_nconf2sockinfo(nconf, &si))
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continue;
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TAILQ_INIT(&fdlist[fdlistno].nal);
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if (__rpc_getbroadifs(si.si_af, si.si_proto, si.si_socktype,
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&fdlist[fdlistno].nal) == 0)
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continue;
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fd = _socket(si.si_af, si.si_socktype, si.si_proto);
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if (fd < 0) {
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stat = RPC_CANTSEND;
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continue;
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}
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fdlist[fdlistno].af = si.si_af;
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fdlist[fdlistno].proto = si.si_proto;
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fdlist[fdlistno].fd = fd;
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fdlist[fdlistno].nconf = nconf;
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fdlist[fdlistno].asize = __rpc_get_a_size(si.si_af);
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pfd[fdlistno].events = POLLIN | POLLPRI |
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POLLRDNORM | POLLRDBAND;
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pfd[fdlistno].fd = fdlist[fdlistno].fd = fd;
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fdlist[fdlistno].dsize = __rpc_get_t_size(si.si_af, si.si_proto,
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0);
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if (maxbufsize <= fdlist[fdlistno].dsize)
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maxbufsize = fdlist[fdlistno].dsize;
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#ifdef PORTMAP
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if (si.si_af == AF_INET && si.si_proto == IPPROTO_UDP) {
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udpbufsz = fdlist[fdlistno].dsize;
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if ((outbuf_pmap = malloc(udpbufsz)) == NULL) {
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_close(fd);
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stat = RPC_SYSTEMERROR;
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goto done_broad;
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}
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pmap_flag = 1;
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}
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#endif /* PORTMAP */
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fdlistno++;
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}
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if (fdlistno == 0) {
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if (stat == RPC_SUCCESS)
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stat = RPC_UNKNOWNPROTO;
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goto done_broad;
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}
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if (maxbufsize == 0) {
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if (stat == RPC_SUCCESS)
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stat = RPC_CANTSEND;
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goto done_broad;
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}
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inbuf = malloc(maxbufsize);
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outbuf = malloc(maxbufsize);
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if ((inbuf == NULL) || (outbuf == NULL)) {
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stat = RPC_SYSTEMERROR;
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goto done_broad;
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}
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/* Serialize all the arguments which have to be sent */
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(void) gettimeofday(&t, NULL);
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msg.rm_xid = __RPC_GETXID(&t);
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msg.rm_direction = CALL;
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msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
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msg.rm_call.cb_prog = RPCBPROG;
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msg.rm_call.cb_vers = RPCBVERS;
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msg.rm_call.cb_proc = RPCBPROC_CALLIT;
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barg.prog = prog;
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barg.vers = vers;
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barg.proc = proc;
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barg.args.args_val = argsp;
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barg.xdr_args = xargs;
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bres.addr = uaddrp;
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bres.results.results_val = resultsp;
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bres.xdr_res = xresults;
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msg.rm_call.cb_cred = sys_auth->ah_cred;
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msg.rm_call.cb_verf = sys_auth->ah_verf;
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xdrmem_create(xdrs, outbuf, maxbufsize, XDR_ENCODE);
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if ((!xdr_callmsg(xdrs, &msg)) ||
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(!xdr_rpcb_rmtcallargs(xdrs,
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(struct rpcb_rmtcallargs *)(void *)&barg))) {
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stat = RPC_CANTENCODEARGS;
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goto done_broad;
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}
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outlen = xdr_getpos(xdrs);
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xdr_destroy(xdrs);
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#ifdef PORTMAP
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/* Prepare the packet for version 2 PORTMAP */
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if (pmap_flag) {
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msg.rm_xid++; /* One way to distinguish */
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msg.rm_call.cb_prog = PMAPPROG;
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msg.rm_call.cb_vers = PMAPVERS;
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msg.rm_call.cb_proc = PMAPPROC_CALLIT;
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barg_pmap.prog = prog;
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barg_pmap.vers = vers;
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barg_pmap.proc = proc;
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barg_pmap.args_ptr = argsp;
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barg_pmap.xdr_args = xargs;
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bres_pmap.port_ptr = &port;
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bres_pmap.xdr_results = xresults;
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bres_pmap.results_ptr = resultsp;
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xdrmem_create(xdrs, outbuf_pmap, udpbufsz, XDR_ENCODE);
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if ((! xdr_callmsg(xdrs, &msg)) ||
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(! xdr_rmtcall_args(xdrs, &barg_pmap))) {
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stat = RPC_CANTENCODEARGS;
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goto done_broad;
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}
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outlen_pmap = xdr_getpos(xdrs);
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xdr_destroy(xdrs);
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}
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#endif /* PORTMAP */
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/*
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* Basic loop: broadcast the packets to transports which
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* support data packets of size such that one can encode
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* all the arguments.
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* Wait a while for response(s).
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* The response timeout grows larger per iteration.
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*/
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for (msec = inittime; msec <= waittime; msec += msec) {
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struct broadif *bip;
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/* Broadcast all the packets now */
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for (i = 0; i < fdlistno; i++) {
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if (fdlist[i].dsize < outlen) {
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stat = RPC_CANTSEND;
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continue;
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}
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for (bip = TAILQ_FIRST(&fdlist[i].nal); bip != NULL;
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bip = TAILQ_NEXT(bip, link)) {
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void *addr;
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addr = &bip->broadaddr;
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__rpc_broadenable(fdlist[i].af, fdlist[i].fd,
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bip);
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/*
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* Only use version 3 if lowvers is not set
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*/
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if (!__rpc_lowvers)
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if (_sendto(fdlist[i].fd, outbuf,
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outlen, 0, (struct sockaddr*)addr,
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(size_t)fdlist[i].asize) !=
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outlen) {
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#ifdef RPC_DEBUG
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perror("sendto");
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#endif
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warnx("clnt_bcast: cannot send "
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"broadcast packet");
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stat = RPC_CANTSEND;
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continue;
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};
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#ifdef RPC_DEBUG
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if (!__rpc_lowvers)
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fprintf(stderr, "Broadcast packet sent "
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"for %s\n",
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fdlist[i].nconf->nc_netid);
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#endif
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#ifdef PORTMAP
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/*
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* Send the version 2 packet also
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* for UDP/IP
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*/
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if (pmap_flag &&
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fdlist[i].proto == IPPROTO_UDP) {
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if (_sendto(fdlist[i].fd, outbuf_pmap,
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outlen_pmap, 0, addr,
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(size_t)fdlist[i].asize) !=
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outlen_pmap) {
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warnx("clnt_bcast: "
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"Cannot send broadcast packet");
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stat = RPC_CANTSEND;
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continue;
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}
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}
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#ifdef RPC_DEBUG
|
|
fprintf(stderr, "PMAP Broadcast packet "
|
|
"sent for %s\n",
|
|
fdlist[i].nconf->nc_netid);
|
|
#endif
|
|
#endif /* PORTMAP */
|
|
}
|
|
/* End for sending all packets on this transport */
|
|
} /* End for sending on all transports */
|
|
|
|
if (eachresult == NULL) {
|
|
stat = RPC_SUCCESS;
|
|
goto done_broad;
|
|
}
|
|
|
|
/*
|
|
* Get all the replies from these broadcast requests
|
|
*/
|
|
recv_again:
|
|
|
|
switch (pollretval = _poll(pfd, fdlistno, msec)) {
|
|
case 0: /* timed out */
|
|
stat = RPC_TIMEDOUT;
|
|
continue;
|
|
case -1: /* some kind of error - we ignore it */
|
|
goto recv_again;
|
|
} /* end of poll results switch */
|
|
|
|
for (i = fds_found = 0;
|
|
i < fdlistno && fds_found < pollretval; i++) {
|
|
bool_t done = FALSE;
|
|
|
|
if (pfd[i].revents == 0)
|
|
continue;
|
|
else if (pfd[i].revents & POLLNVAL) {
|
|
/*
|
|
* Something bad has happened to this descri-
|
|
* ptor. We can cause _poll() to ignore
|
|
* it simply by using a negative fd. We do that
|
|
* rather than compacting the pfd[] and fdlist[]
|
|
* arrays.
|
|
*/
|
|
pfd[i].fd = -1;
|
|
fds_found++;
|
|
continue;
|
|
} else
|
|
fds_found++;
|
|
#ifdef RPC_DEBUG
|
|
fprintf(stderr, "response for %s\n",
|
|
fdlist[i].nconf->nc_netid);
|
|
#endif
|
|
try_again:
|
|
inlen = _recvfrom(fdlist[i].fd, inbuf, fdlist[i].dsize,
|
|
0, (struct sockaddr *)(void *)&fdlist[i].raddr,
|
|
&fdlist[i].asize);
|
|
if (inlen < 0) {
|
|
if (errno == EINTR)
|
|
goto try_again;
|
|
warnx("clnt_bcast: Cannot receive reply to "
|
|
"broadcast");
|
|
stat = RPC_CANTRECV;
|
|
continue;
|
|
}
|
|
if (inlen < sizeof (u_int32_t))
|
|
continue; /* Drop that and go ahead */
|
|
/*
|
|
* see if reply transaction id matches sent id.
|
|
* If so, decode the results. If return id is xid + 1
|
|
* it was a PORTMAP reply
|
|
*/
|
|
if (*((u_int32_t *)(void *)(inbuf)) ==
|
|
*((u_int32_t *)(void *)(outbuf))) {
|
|
pmap_reply_flag = 0;
|
|
msg.acpted_rply.ar_verf = _null_auth;
|
|
msg.acpted_rply.ar_results.where =
|
|
(caddr_t)(void *)&bres;
|
|
msg.acpted_rply.ar_results.proc =
|
|
(xdrproc_t)xdr_rpcb_rmtcallres;
|
|
#ifdef PORTMAP
|
|
} else if (pmap_flag &&
|
|
*((u_int32_t *)(void *)(inbuf)) ==
|
|
*((u_int32_t *)(void *)(outbuf_pmap))) {
|
|
pmap_reply_flag = 1;
|
|
msg.acpted_rply.ar_verf = _null_auth;
|
|
msg.acpted_rply.ar_results.where =
|
|
(caddr_t)(void *)&bres_pmap;
|
|
msg.acpted_rply.ar_results.proc =
|
|
(xdrproc_t)xdr_rmtcallres;
|
|
#endif /* PORTMAP */
|
|
} else
|
|
continue;
|
|
xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
|
|
if (xdr_replymsg(xdrs, &msg)) {
|
|
if ((msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
|
|
(msg.acpted_rply.ar_stat == SUCCESS)) {
|
|
struct netbuf taddr, *np;
|
|
struct sockaddr_in *sin;
|
|
|
|
#ifdef PORTMAP
|
|
if (pmap_flag && pmap_reply_flag) {
|
|
sin = (struct sockaddr_in *)
|
|
(void *)&fdlist[i].raddr;
|
|
sin->sin_port =
|
|
htons((u_short)port);
|
|
taddr.len = taddr.maxlen =
|
|
fdlist[i].raddr.ss_len;
|
|
taddr.buf = &fdlist[i].raddr;
|
|
done = (*eachresult)(resultsp,
|
|
&taddr, fdlist[i].nconf);
|
|
} else {
|
|
#endif /* PORTMAP */
|
|
#ifdef RPC_DEBUG
|
|
fprintf(stderr, "uaddr %s\n",
|
|
uaddrp);
|
|
#endif
|
|
np = uaddr2taddr(
|
|
fdlist[i].nconf, uaddrp);
|
|
done = (*eachresult)(resultsp,
|
|
np, fdlist[i].nconf);
|
|
free(np);
|
|
#ifdef PORTMAP
|
|
}
|
|
#endif /* PORTMAP */
|
|
}
|
|
/* otherwise, we just ignore the errors ... */
|
|
}
|
|
/* else some kind of deserialization problem ... */
|
|
|
|
xdrs->x_op = XDR_FREE;
|
|
msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
|
|
(void) xdr_replymsg(xdrs, &msg);
|
|
(void) (*xresults)(xdrs, resultsp);
|
|
XDR_DESTROY(xdrs);
|
|
if (done) {
|
|
stat = RPC_SUCCESS;
|
|
goto done_broad;
|
|
} else {
|
|
goto recv_again;
|
|
}
|
|
} /* The recv for loop */
|
|
} /* The giant for loop */
|
|
|
|
done_broad:
|
|
if (inbuf)
|
|
(void) free(inbuf);
|
|
if (outbuf)
|
|
(void) free(outbuf);
|
|
#ifdef PORTMAP
|
|
if (outbuf_pmap)
|
|
(void) free(outbuf_pmap);
|
|
#endif /* PORTMAP */
|
|
for (i = 0; i < fdlistno; i++) {
|
|
(void)_close(fdlist[i].fd);
|
|
__rpc_freebroadifs(&fdlist[i].nal);
|
|
}
|
|
AUTH_DESTROY(sys_auth);
|
|
(void) __rpc_endconf(handle);
|
|
|
|
return (stat);
|
|
}
|
|
|
|
|
|
enum clnt_stat
|
|
rpc_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp,
|
|
eachresult, nettype)
|
|
rpcprog_t prog; /* program number */
|
|
rpcvers_t vers; /* version number */
|
|
rpcproc_t proc; /* procedure number */
|
|
xdrproc_t xargs; /* xdr routine for args */
|
|
caddr_t argsp; /* pointer to args */
|
|
xdrproc_t xresults; /* xdr routine for results */
|
|
caddr_t resultsp; /* pointer to results */
|
|
resultproc_t eachresult; /* call with each result obtained */
|
|
const char *nettype; /* transport type */
|
|
{
|
|
enum clnt_stat dummy;
|
|
|
|
dummy = rpc_broadcast_exp(prog, vers, proc, xargs, argsp,
|
|
xresults, resultsp, eachresult,
|
|
INITTIME, WAITTIME, nettype);
|
|
return (dummy);
|
|
}
|