2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#) Copyright (c) 1990, 1993 The Regents of the University of California. All rights reserved.
34 * @(#)portmap.c 8.1 (Berkeley) 6/6/93
35 * $FreeBSD: src/usr.sbin/portmap/portmap.c,v 1.10.2.3 2002/05/06 18:18:21 dwmalone Exp $
36 * $DragonFly: src/usr.sbin/portmap/portmap.c,v 1.4 2004/03/30 02:58:59 cpressey Exp $
40 @(#)portmap.c 2.3 88/08/11 4.0 RPCSRC
41 static char sccsid[] = "@(#)portmap.c 1.32 87/08/06 Copyr 1984 Sun Micro";
45 * portmap.c, Implements the program,version to port number mapping for
50 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
51 * unrestricted use provided that this legend is included on all tape
52 * media and as a part of the software program in whole or part. Users
53 * may copy or modify Sun RPC without charge, but are not authorized
54 * to license or distribute it to anyone else except as part of a product or
55 * program developed by the user.
57 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
58 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
59 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
61 * Sun RPC is provided with no support and without any obligation on the
62 * part of Sun Microsystems, Inc. to assist in its use, correction,
63 * modification or enhancement.
65 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
66 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
67 * OR ANY PART THEREOF.
69 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
70 * or profits or other special, indirect and consequential damages, even if
71 * Sun has been advised of the possibility of such damages.
73 * Sun Microsystems, Inc.
75 * Mountain View, California 94043
78 #include <sys/types.h>
79 #include <sys/socket.h>
80 #include <sys/ioctl.h>
82 #include <sys/signal.h>
84 #include <sys/resource.h>
86 #include <rpc/pmap_prot.h>
97 #include "pmap_check.h"
99 static void reg_service(struct svc_req *, SVCXPRT *);
100 static void reap(int);
101 static void callit(struct svc_req *, SVCXPRT *);
102 static void usage(void);
104 struct pmaplist *pmaplist;
108 main(int argc, char **argv)
114 struct sockaddr_in addr;
115 int len = sizeof(struct sockaddr_in);
116 struct pmaplist *pml;
118 while ((c = getopt(argc, argv, "dvh:")) != -1) {
131 hosts = realloc(hosts, nhosts * sizeof(char *));
132 hosts[nhosts - 1] = optarg;
140 if (!debugging && daemon(0, 0))
143 openlog("portmap", debugging ? LOG_PID | LOG_PERROR : LOG_PID,
146 bzero(&addr, sizeof(addr));
147 addr.sin_family = AF_INET;
148 addr.sin_port = htons(PMAPPORT);
151 * If no hosts were specified, just bind to INADDR_ANY. Otherwise
152 * make sure 127.0.0.1 is added to the list.
155 hosts = realloc(hosts, nhosts * sizeof(char *));
157 hosts[0] = "0.0.0.0";
159 hosts[nhosts - 1] = "127.0.0.1";
162 * Add UDP socket(s) - bind to specific IPs if asked to
167 if (!inet_aton(hosts[nhosts], &addr.sin_addr)) {
168 syslog(LOG_ERR, "bad IP address: %s", hosts[nhosts]);
171 if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
172 syslog(LOG_ERR, "cannot create udp socket: %m");
176 if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
177 syslog(LOG_ERR, "cannot bind udp: %m");
181 if ((xprt = svcudp_create(sock)) == (SVCXPRT *)NULL) {
182 syslog(LOG_ERR, "couldn't do udp_create");
186 /* make an entry for ourself */
187 pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
189 pml->pml_map.pm_prog = PMAPPROG;
190 pml->pml_map.pm_vers = PMAPVERS;
191 pml->pml_map.pm_prot = IPPROTO_UDP;
192 pml->pml_map.pm_port = PMAPPORT;
198 addr.sin_addr.s_addr = 0;
199 if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
200 syslog(LOG_ERR, "cannot create tcp socket: %m");
203 if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
204 syslog(LOG_ERR, "cannot bind tcp: %m");
207 if ((xprt = svctcp_create(sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE))
208 == (SVCXPRT *)NULL) {
209 syslog(LOG_ERR, "couldn't do tcp_create");
212 /* make an entry for ourself */
213 pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
214 pml->pml_map.pm_prog = PMAPPROG;
215 pml->pml_map.pm_vers = PMAPVERS;
216 pml->pml_map.pm_prot = IPPROTO_TCP;
217 pml->pml_map.pm_port = PMAPPORT;
218 pml->pml_next = pmaplist;
221 svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE);
223 /* additional initializations */
225 signal(SIGCHLD, reap);
227 syslog(LOG_ERR, "svc_run returned unexpectedly");
234 fprintf(stderr, "usage: portmap [-dv] [-h bindip]\n");
239 /* need to override perror calls in rpc library */
241 perror(const char *what)
243 syslog(LOG_ERR, "%s: %m", what);
247 static struct pmaplist *
248 find_service(u_long prog, u_long vers, u_long prot)
250 struct pmaplist *hit = NULL;
251 struct pmaplist *pml;
253 for (pml = pmaplist; pml != NULL; pml = pml->pml_next) {
254 if ((pml->pml_map.pm_prog != prog) ||
255 (pml->pml_map.pm_prot != prot))
258 if (pml->pml_map.pm_vers == vers)
268 reg_service(struct svc_req *rqstp, SVCXPRT *xprt)
271 struct pmaplist *pml, *prevpml, *fnd;
276 * Later wrappers change the logging severity on the fly. Reset to
277 * defaults before handling the next request.
279 allow_severity = LOG_INFO;
280 deny_severity = LOG_WARNING;
283 fprintf(stderr, "server: about to do a switch\n");
284 switch (rqstp->rq_proc) {
290 /* remote host authorization check */
291 check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0);
292 if (!svc_sendreply(xprt, xdr_void, (caddr_t)0) && debugging) {
299 * Set a program,version to port mapping
301 if (!svc_getargs(xprt, xdr_pmap, (caddr_t)®))
304 /* reject non-local requests, protect priv. ports */
305 if (!check_setunset(svc_getcaller(xprt),
306 rqstp->rq_proc, reg.pm_prog, reg.pm_port)) {
311 * check to see if already used
312 * find_service returns a hit even if
313 * the versions don't match, so check for it
315 fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
316 if (fnd && fnd->pml_map.pm_vers == reg.pm_vers) {
317 if (fnd->pml_map.pm_port == reg.pm_port) {
329 pml = (struct pmaplist *)
330 malloc((u_int)sizeof(struct pmaplist));
336 for (fnd= pmaplist; fnd->pml_next != 0;
337 fnd = fnd->pml_next);
343 if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
345 fprintf(stderr, "svc_sendreply\n");
353 * Remove a program,version to port mapping.
355 if (!svc_getargs(xprt, xdr_pmap, (caddr_t)®))
359 /* reject non-local requests */
360 if (!check_setunset(svc_getcaller(xprt),
361 rqstp->rq_proc, reg.pm_prog, (u_long) 0))
363 for (prevpml = NULL, pml = pmaplist; pml != NULL; ) {
364 if ((pml->pml_map.pm_prog != reg.pm_prog) ||
365 (pml->pml_map.pm_vers != reg.pm_vers)) {
366 /* both pml & prevpml move forwards */
371 /* found it; pml moves forward, prevpml stays */
372 /* privileged port check */
373 if (!check_privileged_port(svc_getcaller(xprt),
376 pml->pml_map.pm_port)) {
386 prevpml->pml_next = pml;
389 if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
391 fprintf(stderr, "svc_sendreply\n");
397 case PMAPPROC_GETPORT:
399 * Lookup the mapping for a program,version and return its port
401 if (!svc_getargs(xprt, xdr_pmap, (caddr_t)®))
404 /* remote host authorization check */
405 if (!check_default(svc_getcaller(xprt),
411 fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
413 port = fnd->pml_map.pm_port;
416 if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&port)) &&
418 fprintf(stderr, "svc_sendreply\n");
426 * Return the current set of mapped program,version
428 if (!svc_getargs(xprt, xdr_void, NULL))
431 /* remote host authorization check */
433 if (!check_default(svc_getcaller(xprt),
434 rqstp->rq_proc, (u_long) 0)) {
435 p = 0; /* send empty list */
439 if ((!svc_sendreply(xprt, xdr_pmaplist,
440 (caddr_t)&p)) && debugging) {
441 fprintf(stderr, "svc_sendreply\n");
447 case PMAPPROC_CALLIT:
449 * Calls a procedure on the local machine. If the requested
450 * procedure is not registered this procedure does not return
451 * error information!!
452 * This procedure is only supported on rpc/udp and calls via
453 * rpc/udp. It passes null authentication parameters.
459 /* remote host authorization check */
460 check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0);
468 * Stuff for the rmtcall service
478 xdr_encap_parms(XDR *xdrs, struct encap_parms *epp)
480 return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE));
488 struct encap_parms rmt_args;
492 xdr_rmtcall_args(XDR *xdrs, struct rmtcallargs *cap)
494 /* does not get a port number */
495 if (xdr_u_long(xdrs, &(cap->rmt_prog)) &&
496 xdr_u_long(xdrs, &(cap->rmt_vers)) &&
497 xdr_u_long(xdrs, &(cap->rmt_proc))) {
498 return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
504 xdr_rmtcall_result(XDR *xdrs, struct rmtcallargs *cap)
506 if (xdr_u_long(xdrs, &(cap->rmt_port)))
507 return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
512 * only worries about the struct encap_parms part of struct rmtcallargs.
513 * The arglen must already be set!!
516 xdr_opaque_parms(XDR *xdrs, struct rmtcallargs *cap)
518 return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen));
522 * This routine finds and sets the length of incoming opaque paraters
523 * and then calls xdr_opaque_parms.
526 xdr_len_opaque_parms(XDR *xdrs, struct rmtcallargs *cap)
528 u_int beginpos, lowpos, highpos, currpos, pos;
530 beginpos = lowpos = pos = xdr_getpos(xdrs);
531 highpos = lowpos + ARGSIZE;
532 while ((int)(highpos - lowpos) >= 0) {
533 currpos = (lowpos + highpos) / 2;
534 if (xdr_setpos(xdrs, currpos)) {
536 lowpos = currpos + 1;
538 highpos = currpos - 1;
541 xdr_setpos(xdrs, beginpos);
542 cap->rmt_args.arglen = pos - beginpos;
543 return (xdr_opaque_parms(xdrs, cap));
547 * Call a remote procedure service
548 * This procedure is very quiet when things go wrong.
549 * The proc is written to support broadcast rpc. In the broadcast case,
550 * a machine should shut-up instead of complain, less the requestor be
551 * overrun with complaints at the expense of not hearing a valid reply ...
553 * This now forks so that the program & process that it calls can call
554 * back to the portmapper.
557 callit(struct svc_req *rqstp, SVCXPRT *xprt)
559 struct rmtcallargs a;
560 struct pmaplist *pml;
562 struct sockaddr_in me;
565 struct authunix_parms *au = (struct authunix_parms *)rqstp->rq_clntcred;
566 struct timeval timeout;
571 a.rmt_args.args = buf;
572 if (!svc_getargs(xprt, xdr_rmtcall_args, (caddr_t)&a))
574 /* host and service access control */
575 if (!check_callit(svc_getcaller(xprt),
576 rqstp->rq_proc, a.rmt_prog, a.rmt_proc))
578 if ((pml = find_service(a.rmt_prog, a.rmt_vers,
579 (u_long)IPPROTO_UDP)) == NULL)
582 * fork a child to do the work. Parent immediately returns.
583 * Child exits upon completion.
585 if ((pid = fork()) != 0) {
587 syslog(LOG_ERR, "CALLIT (prog %lu): fork: %m",
591 port = pml->pml_map.pm_port;
593 me.sin_port = htons(port);
594 client = clntudp_create(&me, a.rmt_prog, a.rmt_vers, timeout, &so);
595 if (client != (CLIENT *)NULL) {
596 if (rqstp->rq_cred.oa_flavor == AUTH_UNIX) {
597 client->cl_auth = authunix_create(au->aup_machname,
598 au->aup_uid, au->aup_gid, au->aup_len, au->aup_gids);
600 a.rmt_port = (u_long)port;
601 if (clnt_call(client, a.rmt_proc, xdr_opaque_parms, &a,
602 xdr_len_opaque_parms, &a, timeout) == RPC_SUCCESS) {
603 svc_sendreply(xprt, xdr_rmtcall_result, (caddr_t)&a);
605 AUTH_DESTROY(client->cl_auth);
606 clnt_destroy(client);
618 while (wait3((int *)NULL, WNOHANG, (struct rusage *)NULL) > 0);