1/*	$NetBSD: pmap_svc.c,v 1.2 2000/10/20 11:49:40 fvdl Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2009, Sun Microsystems, Inc.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 * - Redistributions of source code must retain the above copyright notice,
12 *   this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright notice,
14 *   this list of conditions and the following disclaimer in the documentation
15 *   and/or other materials provided with the distribution.
16 * - Neither the name of Sun Microsystems, Inc. nor the names of its
17 *   contributors may be used to endorse or promote products derived
18 *   from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32/*
33 * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc.
34 */
35
36/*
37 * pmap_svc.c
38 * The server procedure for the version 2 portmaper.
39 * All the portmapper related interface from the portmap side.
40 */
41
42#ifdef PORTMAP
43#include <sys/types.h>
44#include <sys/socket.h>
45#include <stdio.h>
46#include <rpc/rpc.h>
47#include <rpc/pmap_prot.h>
48#include <rpc/rpcb_prot.h>
49#ifdef RPCBIND_DEBUG
50#include <stdlib.h>
51#endif
52#include "rpcbind.h"
53
54static struct pmaplist *find_service_pmap(rpcprog_t, rpcvers_t,
55					       rpcprot_t);
56static bool_t pmapproc_change(struct svc_req *, SVCXPRT *, u_long);
57static bool_t pmapproc_getport(struct svc_req *, SVCXPRT *);
58static bool_t pmapproc_dump(struct svc_req *, SVCXPRT *);
59
60/*
61 * Called for all the version 2 inquiries.
62 */
63void
64pmap_service(struct svc_req *rqstp, SVCXPRT *xprt)
65{
66	rpcbs_procinfo(RPCBVERS_2_STAT, rqstp->rq_proc);
67	switch (rqstp->rq_proc) {
68	case PMAPPROC_NULL:
69		/*
70		 * Null proc call
71		 */
72#ifdef RPCBIND_DEBUG
73		if (debugging)
74			fprintf(stderr, "PMAPPROC_NULL\n");
75#endif
76		check_access(xprt, rqstp->rq_proc, NULL, PMAPVERS);
77		if ((!svc_sendreply(xprt, (xdrproc_t) xdr_void, NULL)) &&
78			debugging) {
79			if (doabort) {
80				rpcbind_abort();
81			}
82		}
83		break;
84
85	case PMAPPROC_SET:
86		/*
87		 * Set a program, version to port mapping
88		 */
89		pmapproc_change(rqstp, xprt, rqstp->rq_proc);
90		break;
91
92	case PMAPPROC_UNSET:
93		/*
94		 * Remove a program, version to port mapping.
95		 */
96		pmapproc_change(rqstp, xprt, rqstp->rq_proc);
97		break;
98
99	case PMAPPROC_GETPORT:
100		/*
101		 * Lookup the mapping for a program, version and return its
102		 * port number.
103		 */
104		pmapproc_getport(rqstp, xprt);
105		break;
106
107	case PMAPPROC_DUMP:
108		/*
109		 * Return the current set of mapped program, version
110		 */
111#ifdef RPCBIND_DEBUG
112		if (debugging)
113			fprintf(stderr, "PMAPPROC_DUMP\n");
114#endif
115		pmapproc_dump(rqstp, xprt);
116		break;
117
118	case PMAPPROC_CALLIT:
119		/*
120		 * Calls a procedure on the local machine. If the requested
121		 * procedure is not registered this procedure does not return
122		 * error information!!
123		 * This procedure is only supported on rpc/udp and calls via
124		 * rpc/udp. It passes null authentication parameters.
125		 */
126		rpcbproc_callit_com(rqstp, xprt, PMAPPROC_CALLIT, PMAPVERS);
127		break;
128
129	default:
130		svcerr_noproc(xprt);
131		break;
132	}
133}
134
135/*
136 * returns the item with the given program, version number. If that version
137 * number is not found, it returns the item with that program number, so that
138 * the port number is now returned to the caller. The caller when makes a
139 * call to this program, version number, the call will fail and it will
140 * return with PROGVERS_MISMATCH. The user can then determine the highest
141 * and the lowest version number for this program using clnt_geterr() and
142 * use those program version numbers.
143 */
144static struct pmaplist *
145find_service_pmap(rpcprog_t prog, rpcvers_t vers, rpcprot_t prot)
146{
147	register struct pmaplist *hit = NULL;
148	register struct pmaplist *pml;
149
150	for (pml = list_pml; pml != NULL; pml = pml->pml_next) {
151		if ((pml->pml_map.pm_prog != prog) ||
152			(pml->pml_map.pm_prot != prot))
153			continue;
154		hit = pml;
155		if (pml->pml_map.pm_vers == vers)
156			break;
157	}
158	return (hit);
159}
160
161static bool_t
162pmapproc_change(struct svc_req *rqstp __unused, SVCXPRT *xprt, unsigned long op)
163{
164	struct pmap reg;
165	RPCB rpcbreg;
166	long ans;
167	struct sockaddr_in *who;
168	uid_t uid;
169	char uidbuf[32];
170
171#ifdef RPCBIND_DEBUG
172	if (debugging)
173		fprintf(stderr, "%s request for (%lu, %lu) : ",
174		    op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
175		    reg.pm_prog, reg.pm_vers);
176#endif
177
178	if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
179		svcerr_decode(xprt);
180		return (FALSE);
181	}
182
183	if (!check_access(xprt, op, &reg, PMAPVERS)) {
184		svcerr_weakauth(xprt);
185		return FALSE;
186	}
187
188	who = svc_getcaller(xprt);
189
190	/*
191	 * Can't use getpwnam here. We might end up calling ourselves
192	 * and looping.
193	 */
194	if (__rpc_get_local_uid(xprt, &uid) < 0)
195		rpcbreg.r_owner = "unknown";
196	else if (uid == 0)
197		rpcbreg.r_owner = "superuser";
198	else {
199		/* r_owner will be strdup-ed later */
200		snprintf(uidbuf, sizeof uidbuf, "%d", uid);
201		rpcbreg.r_owner = uidbuf;
202	}
203
204	rpcbreg.r_prog = reg.pm_prog;
205	rpcbreg.r_vers = reg.pm_vers;
206
207	if (op == PMAPPROC_SET) {
208		char buf[32];
209
210		snprintf(buf, sizeof buf, "0.0.0.0.%d.%d",
211		    (int)((reg.pm_port >> 8) & 0xff),
212		    (int)(reg.pm_port & 0xff));
213		rpcbreg.r_addr = buf;
214		if (reg.pm_prot == IPPROTO_UDP) {
215			rpcbreg.r_netid = udptrans;
216		} else if (reg.pm_prot == IPPROTO_TCP) {
217			rpcbreg.r_netid = tcptrans;
218		} else {
219			ans = FALSE;
220			goto done_change;
221		}
222		ans = map_set(&rpcbreg, rpcbreg.r_owner);
223	} else if (op == PMAPPROC_UNSET) {
224		bool_t ans1, ans2;
225
226		rpcbreg.r_addr = NULL;
227		rpcbreg.r_netid = tcptrans;
228		ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
229		rpcbreg.r_netid = udptrans;
230		ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
231		ans = ans1 || ans2;
232	} else {
233		ans = FALSE;
234	}
235done_change:
236	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t) &ans)) &&
237	    debugging) {
238		fprintf(stderr, "portmap: svc_sendreply\n");
239		if (doabort) {
240			rpcbind_abort();
241		}
242	}
243#ifdef RPCBIND_DEBUG
244	if (debugging)
245		fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed");
246#endif
247	if (op == PMAPPROC_SET)
248		rpcbs_set(RPCBVERS_2_STAT, ans);
249	else
250		rpcbs_unset(RPCBVERS_2_STAT, ans);
251	return (TRUE);
252}
253
254/* ARGSUSED */
255static bool_t
256pmapproc_getport(struct svc_req *rqstp __unused, SVCXPRT *xprt)
257{
258	struct pmap reg;
259	long lport;
260	int port = 0;
261	struct pmaplist *fnd;
262#ifdef RPCBIND_DEBUG
263	char *uaddr;
264#endif
265
266	if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
267		svcerr_decode(xprt);
268		return (FALSE);
269	}
270
271	if (!check_access(xprt, PMAPPROC_GETPORT, &reg, PMAPVERS)) {
272		svcerr_weakauth(xprt);
273		return FALSE;
274	}
275
276#ifdef RPCBIND_DEBUG
277	if (debugging) {
278		uaddr =  taddr2uaddr(rpcbind_get_conf(xprt->xp_netid),
279			    svc_getrpccaller(xprt));
280		fprintf(stderr, "PMAP_GETPORT req for (%lu, %lu, %s) from %s :",
281			reg.pm_prog, reg.pm_vers,
282			reg.pm_prot == IPPROTO_UDP ? "udp" : "tcp", uaddr);
283		free(uaddr);
284	}
285#endif
286	fnd = find_service_pmap(reg.pm_prog, reg.pm_vers, reg.pm_prot);
287	if (fnd) {
288		char serveuaddr[32], *ua;
289		int h1, h2, h3, h4, p1, p2;
290		char *netid;
291
292		if (reg.pm_prot == IPPROTO_UDP) {
293			ua = udp_uaddr;
294			netid = udptrans;
295		} else {
296			ua = tcp_uaddr; /* To get the len */
297			netid = tcptrans;
298		}
299		if (ua == NULL) {
300			goto sendreply;
301		}
302		if (sscanf(ua, "%d.%d.%d.%d.%d.%d", &h1, &h2, &h3,
303				&h4, &p1, &p2) == 6) {
304			p1 = (fnd->pml_map.pm_port >> 8) & 0xff;
305			p2 = (fnd->pml_map.pm_port) & 0xff;
306			snprintf(serveuaddr, sizeof serveuaddr,
307			    "%d.%d.%d.%d.%d.%d", h1, h2, h3, h4, p1, p2);
308			if (is_bound(netid, serveuaddr)) {
309				port = fnd->pml_map.pm_port;
310			} else { /* this service is dead; delete it */
311				delete_prog(reg.pm_prog);
312			}
313		}
314	}
315sendreply:
316	lport = port;
317	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t)&lport)) &&
318			debugging) {
319		(void) fprintf(stderr, "portmap: svc_sendreply\n");
320		if (doabort) {
321			rpcbind_abort();
322		}
323	}
324#ifdef RPCBIND_DEBUG
325	if (debugging)
326		fprintf(stderr, "port = %d\n", port);
327#endif
328	rpcbs_getaddr(RPCBVERS_2_STAT, reg.pm_prog, reg.pm_vers,
329		reg.pm_prot == IPPROTO_UDP ? udptrans : tcptrans,
330		port ? udptrans : "");
331
332	return (TRUE);
333}
334
335/* ARGSUSED */
336static bool_t
337pmapproc_dump(struct svc_req *rqstp __unused, SVCXPRT *xprt)
338{
339	if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
340		svcerr_decode(xprt);
341		return (FALSE);
342	}
343
344	if (!check_access(xprt, PMAPPROC_DUMP, NULL, PMAPVERS)) {
345		svcerr_weakauth(xprt);
346		return FALSE;
347	}
348
349	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_pmaplist_ptr,
350			(caddr_t)&list_pml)) && debugging) {
351		if (debugging)
352			(void) fprintf(stderr, "portmap: svc_sendreply\n");
353		if (doabort) {
354			rpcbind_abort();
355		}
356	}
357	return (TRUE);
358}
359
360#endif /* PORTMAP */
361