600 lines
15 KiB
C
600 lines
15 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* 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 REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1990, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)portmap.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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/*
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@(#)portmap.c 2.3 88/08/11 4.0 RPCSRC
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static char sccsid[] = "@(#)portmap.c 1.32 87/08/06 Copyr 1984 Sun Micro";
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*/
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/*
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* portmap.c, Implements the program,version to port number mapping for
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* rpc.
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*/
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#include <rpc/rpc.h>
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#include <rpc/pmap_prot.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <sys/signal.h>
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#include <sys/resource.h>
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#include "pmap_check.h"
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void reg_service();
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void reap();
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static void callit();
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struct pmaplist *pmaplist;
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int debugging = 0;
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extern int errno;
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main(argc, argv)
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int argc;
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char **argv;
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{
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SVCXPRT *xprt;
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int sock, c;
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struct sockaddr_in addr;
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int len = sizeof(struct sockaddr_in);
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register struct pmaplist *pml;
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while ((c = getopt(argc, argv, "dv")) != EOF) {
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switch (c) {
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case 'd':
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debugging = 1;
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break;
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case 'v':
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verboselog = 1;
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break;
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default:
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(void) fprintf(stderr, "usage: %s [-dv]\n", argv[0]);
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(void) fprintf(stderr, "-d: debugging mode\n");
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(void) fprintf(stderr, "-v: verbose logging\n");
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exit(1);
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}
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}
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if (!debugging && daemon(0, 0)) {
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(void) fprintf(stderr, "portmap: fork: %s", strerror(errno));
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exit(1);
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}
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openlog("portmap", debugging ? LOG_PID | LOG_PERROR : LOG_PID,
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LOG_DAEMON);
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if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
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syslog(LOG_ERR, "cannot create udp socket: %m");
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exit(1);
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}
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addr.sin_addr.s_addr = 0;
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addr.sin_family = AF_INET;
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addr.sin_port = htons(PMAPPORT);
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if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
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syslog(LOG_ERR, "cannot bind udp: %m");
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exit(1);
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}
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if ((xprt = svcudp_create(sock)) == (SVCXPRT *)NULL) {
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syslog(LOG_ERR, "couldn't do udp_create");
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exit(1);
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}
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/* make an entry for ourself */
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pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
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pml->pml_next = 0;
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pml->pml_map.pm_prog = PMAPPROG;
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pml->pml_map.pm_vers = PMAPVERS;
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pml->pml_map.pm_prot = IPPROTO_UDP;
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pml->pml_map.pm_port = PMAPPORT;
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pmaplist = pml;
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if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
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syslog(LOG_ERR, "cannot create tcp socket: %m");
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exit(1);
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}
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if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
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syslog(LOG_ERR, "cannot bind udp: %m");
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exit(1);
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}
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if ((xprt = svctcp_create(sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE))
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== (SVCXPRT *)NULL) {
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syslog(LOG_ERR, "couldn't do tcp_create");
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exit(1);
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}
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/* make an entry for ourself */
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pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
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pml->pml_map.pm_prog = PMAPPROG;
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pml->pml_map.pm_vers = PMAPVERS;
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pml->pml_map.pm_prot = IPPROTO_TCP;
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pml->pml_map.pm_port = PMAPPORT;
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pml->pml_next = pmaplist;
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pmaplist = pml;
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(void)svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE);
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/* additional initializations */
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check_startup();
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(void)signal(SIGCHLD, reap);
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svc_run();
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syslog(LOG_ERR, "run_svc returned unexpectedly");
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abort();
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}
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#ifndef lint
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/* need to override perror calls in rpc library */
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void
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perror(what)
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const char *what;
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{
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syslog(LOG_ERR, "%s: %m", what);
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}
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#endif
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static struct pmaplist *
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find_service(prog, vers, prot)
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u_long prog, vers, prot;
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{
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register struct pmaplist *hit = NULL;
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register struct pmaplist *pml;
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for (pml = pmaplist; pml != NULL; pml = pml->pml_next) {
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if ((pml->pml_map.pm_prog != prog) ||
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(pml->pml_map.pm_prot != prot))
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continue;
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hit = pml;
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if (pml->pml_map.pm_vers == vers)
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break;
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}
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return (hit);
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}
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/*
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* 1 OK, 0 not
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*/
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void
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reg_service(rqstp, xprt)
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struct svc_req *rqstp;
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SVCXPRT *xprt;
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{
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struct pmap reg;
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struct pmaplist *pml, *prevpml, *fnd;
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int ans, port;
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caddr_t t;
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/*
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* Later wrappers change the logging severity on the fly. Reset to
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* defaults before handling the next request.
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*/
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allow_severity = LOG_INFO;
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deny_severity = LOG_WARNING;
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if (debugging)
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(void) fprintf(stderr, "server: about do a switch\n");
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switch (rqstp->rq_proc) {
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case PMAPPROC_NULL:
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/*
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* Null proc call
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*/
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/* remote host authorization check */
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check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0);
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if (!svc_sendreply(xprt, xdr_void, (caddr_t)0) && debugging) {
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abort();
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}
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break;
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case PMAPPROC_SET:
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/*
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* Set a program,version to port mapping
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*/
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if (!svc_getargs(xprt, xdr_pmap, ®))
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svcerr_decode(xprt);
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else {
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/* reject non-local requests, protect priv. ports */
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if (!check_setunset(svc_getcaller(xprt),
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rqstp->rq_proc, reg.pm_prog, reg.pm_port)) {
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ans = 0;
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goto done;
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}
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/*
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* check to see if already used
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* find_service returns a hit even if
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* the versions don't match, so check for it
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*/
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fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
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if (fnd && fnd->pml_map.pm_vers == reg.pm_vers) {
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if (fnd->pml_map.pm_port == reg.pm_port) {
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ans = 1;
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goto done;
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}
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else {
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ans = 0;
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goto done;
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}
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} else {
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/*
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* add to END of list
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*/
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pml = (struct pmaplist *)
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malloc((u_int)sizeof(struct pmaplist));
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pml->pml_map = reg;
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pml->pml_next = 0;
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if (pmaplist == 0) {
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pmaplist = pml;
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} else {
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for (fnd= pmaplist; fnd->pml_next != 0;
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fnd = fnd->pml_next);
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fnd->pml_next = pml;
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}
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ans = 1;
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}
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done:
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if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
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debugging) {
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(void) fprintf(stderr, "svc_sendreply\n");
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abort();
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}
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}
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break;
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case PMAPPROC_UNSET:
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/*
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* Remove a program,version to port mapping.
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*/
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if (!svc_getargs(xprt, xdr_pmap, ®))
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svcerr_decode(xprt);
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else {
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ans = 0;
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/* reject non-local requests */
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if (!check_setunset(svc_getcaller(xprt),
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rqstp->rq_proc, reg.pm_prog, (u_long) 0))
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goto done;
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for (prevpml = NULL, pml = pmaplist; pml != NULL; ) {
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if ((pml->pml_map.pm_prog != reg.pm_prog) ||
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(pml->pml_map.pm_vers != reg.pm_vers)) {
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/* both pml & prevpml move forwards */
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prevpml = pml;
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pml = pml->pml_next;
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continue;
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}
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/* found it; pml moves forward, prevpml stays */
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/* privileged port check */
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if (!check_privileged_port(svc_getcaller(xprt),
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rqstp->rq_proc,
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reg.pm_prog,
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pml->pml_map.pm_port)) {
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ans = 0;
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break;
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}
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ans = 1;
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t = (caddr_t)pml;
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pml = pml->pml_next;
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if (prevpml == NULL)
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pmaplist = pml;
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else
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prevpml->pml_next = pml;
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free(t);
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}
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if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
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debugging) {
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(void) fprintf(stderr, "svc_sendreply\n");
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abort();
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}
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}
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break;
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case PMAPPROC_GETPORT:
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/*
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* Lookup the mapping for a program,version and return its port
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*/
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if (!svc_getargs(xprt, xdr_pmap, ®))
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svcerr_decode(xprt);
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else {
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/* remote host authorization check */
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if (!check_default(svc_getcaller(xprt),
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rqstp->rq_proc,
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reg.pm_prog)) {
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ans = 0;
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goto done;
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}
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fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
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if (fnd)
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port = fnd->pml_map.pm_port;
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else
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port = 0;
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if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&port)) &&
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debugging) {
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(void) fprintf(stderr, "svc_sendreply\n");
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abort();
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}
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}
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break;
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case PMAPPROC_DUMP:
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/*
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* Return the current set of mapped program,version
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*/
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if (!svc_getargs(xprt, xdr_void, NULL))
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svcerr_decode(xprt);
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else {
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/* remote host authorization check */
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struct pmaplist *p;
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if (!check_default(svc_getcaller(xprt),
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rqstp->rq_proc, (u_long) 0)) {
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p = 0; /* send empty list */
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} else {
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p = pmaplist;
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}
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if ((!svc_sendreply(xprt, xdr_pmaplist,
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(caddr_t)&p)) && debugging) {
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(void) fprintf(stderr, "svc_sendreply\n");
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abort();
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}
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}
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break;
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case PMAPPROC_CALLIT:
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/*
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* Calls a procedure on the local machine. If the requested
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* procedure is not registered this procedure does not return
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* error information!!
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* This procedure is only supported on rpc/udp and calls via
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* rpc/udp. It passes null authentication parameters.
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*/
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callit(rqstp, xprt);
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break;
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default:
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/* remote host authorization check */
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check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0);
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svcerr_noproc(xprt);
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break;
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}
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}
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/*
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* Stuff for the rmtcall service
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*/
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#define ARGSIZE 9000
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struct encap_parms {
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u_int arglen;
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char *args;
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};
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static bool_t
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xdr_encap_parms(xdrs, epp)
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XDR *xdrs;
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struct encap_parms *epp;
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{
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return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE));
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}
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struct rmtcallargs {
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u_long rmt_prog;
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u_long rmt_vers;
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u_long rmt_port;
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u_long rmt_proc;
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struct encap_parms rmt_args;
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};
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static bool_t
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xdr_rmtcall_args(xdrs, cap)
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register XDR *xdrs;
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register struct rmtcallargs *cap;
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{
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/* does not get a port number */
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if (xdr_u_long(xdrs, &(cap->rmt_prog)) &&
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xdr_u_long(xdrs, &(cap->rmt_vers)) &&
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xdr_u_long(xdrs, &(cap->rmt_proc))) {
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return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
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}
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return (FALSE);
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}
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static bool_t
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xdr_rmtcall_result(xdrs, cap)
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register XDR *xdrs;
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register struct rmtcallargs *cap;
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{
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if (xdr_u_long(xdrs, &(cap->rmt_port)))
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return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
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return (FALSE);
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}
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/*
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* only worries about the struct encap_parms part of struct rmtcallargs.
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* The arglen must already be set!!
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*/
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static bool_t
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xdr_opaque_parms(xdrs, cap)
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XDR *xdrs;
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struct rmtcallargs *cap;
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{
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return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen));
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}
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/*
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* This routine finds and sets the length of incoming opaque paraters
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* and then calls xdr_opaque_parms.
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*/
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static bool_t
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xdr_len_opaque_parms(xdrs, cap)
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register XDR *xdrs;
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struct rmtcallargs *cap;
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{
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register u_int beginpos, lowpos, highpos, currpos, pos;
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beginpos = lowpos = pos = xdr_getpos(xdrs);
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highpos = lowpos + ARGSIZE;
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while ((int)(highpos - lowpos) >= 0) {
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currpos = (lowpos + highpos) / 2;
|
|
if (xdr_setpos(xdrs, currpos)) {
|
|
pos = currpos;
|
|
lowpos = currpos + 1;
|
|
} else {
|
|
highpos = currpos - 1;
|
|
}
|
|
}
|
|
xdr_setpos(xdrs, beginpos);
|
|
cap->rmt_args.arglen = pos - beginpos;
|
|
return (xdr_opaque_parms(xdrs, cap));
|
|
}
|
|
|
|
/*
|
|
* Call a remote procedure service
|
|
* This procedure is very quiet when things go wrong.
|
|
* The proc is written to support broadcast rpc. In the broadcast case,
|
|
* a machine should shut-up instead of complain, less the requestor be
|
|
* overrun with complaints at the expense of not hearing a valid reply ...
|
|
*
|
|
* This now forks so that the program & process that it calls can call
|
|
* back to the portmapper.
|
|
*/
|
|
static void
|
|
callit(rqstp, xprt)
|
|
struct svc_req *rqstp;
|
|
SVCXPRT *xprt;
|
|
{
|
|
struct rmtcallargs a;
|
|
struct pmaplist *pml;
|
|
u_short port;
|
|
struct sockaddr_in me;
|
|
int pid, so = -1;
|
|
CLIENT *client;
|
|
struct authunix_parms *au = (struct authunix_parms *)rqstp->rq_clntcred;
|
|
struct timeval timeout;
|
|
char buf[ARGSIZE];
|
|
|
|
timeout.tv_sec = 5;
|
|
timeout.tv_usec = 0;
|
|
a.rmt_args.args = buf;
|
|
if (!svc_getargs(xprt, xdr_rmtcall_args, &a))
|
|
return;
|
|
/* host and service access control */
|
|
if (!check_callit(svc_getcaller(xprt),
|
|
rqstp->rq_proc, a.rmt_prog, a.rmt_proc))
|
|
return;
|
|
if ((pml = find_service(a.rmt_prog, a.rmt_vers,
|
|
(u_long)IPPROTO_UDP)) == NULL)
|
|
return;
|
|
/*
|
|
* fork a child to do the work. Parent immediately returns.
|
|
* Child exits upon completion.
|
|
*/
|
|
if ((pid = fork()) != 0) {
|
|
if (pid < 0)
|
|
syslog(LOG_ERR, "CALLIT (prog %lu): fork: %m",
|
|
a.rmt_prog);
|
|
return;
|
|
}
|
|
port = pml->pml_map.pm_port;
|
|
get_myaddress(&me);
|
|
me.sin_port = htons(port);
|
|
client = clntudp_create(&me, a.rmt_prog, a.rmt_vers, timeout, &so);
|
|
if (client != (CLIENT *)NULL) {
|
|
if (rqstp->rq_cred.oa_flavor == AUTH_UNIX) {
|
|
client->cl_auth = authunix_create(au->aup_machname,
|
|
au->aup_uid, au->aup_gid, au->aup_len, au->aup_gids);
|
|
}
|
|
a.rmt_port = (u_long)port;
|
|
if (clnt_call(client, a.rmt_proc, xdr_opaque_parms, &a,
|
|
xdr_len_opaque_parms, &a, timeout) == RPC_SUCCESS) {
|
|
svc_sendreply(xprt, xdr_rmtcall_result, (caddr_t)&a);
|
|
}
|
|
AUTH_DESTROY(client->cl_auth);
|
|
clnt_destroy(client);
|
|
}
|
|
(void)close(so);
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
reap()
|
|
{
|
|
while (wait3((int *)NULL, WNOHANG, (struct rusage *)NULL) > 0);
|
|
}
|