1/*	$NetBSD: pmap_svc.c,v 1.2 2000/10/20 11:49:40 fvdl Exp $	*/
2/*	$FreeBSD$ */
3
4/*-
5 * Copyright (c) 2009, Sun Microsystems, Inc.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 * - Redistributions of source code must retain the above copyright notice,
11 *   this list of conditions and the following disclaimer.
12 * - Redistributions in binary form must reproduce the above copyright notice,
13 *   this list of conditions and the following disclaimer in the documentation
14 *   and/or other materials provided with the distribution.
15 * - Neither the name of Sun Microsystems, Inc. nor the names of its
16 *   contributors may be used to endorse or promote products derived
17 *   from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31/*
32 * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc.
33 */
34
35/* #ident	"@(#)pmap_svc.c	1.14	93/07/05 SMI" */
36
37#if 0
38#ifndef lint
39static	char sccsid[] = "@(#)pmap_svc.c 1.23 89/04/05 Copyr 1984 Sun Micro";
40#endif
41#endif
42
43/*
44 * pmap_svc.c
45 * The server procedure for the version 2 portmaper.
46 * All the portmapper related interface from the portmap side.
47 */
48
49#ifdef PORTMAP
50#include <sys/types.h>
51#include <sys/socket.h>
52#include <stdio.h>
53#include <rpc/rpc.h>
54#include <rpc/pmap_prot.h>
55#include <rpc/rpcb_prot.h>
56#ifdef RPCBIND_DEBUG
57#include <stdlib.h>
58#endif
59#include "rpcbind.h"
60
61static struct pmaplist *find_service_pmap(rpcprog_t, rpcvers_t,
62					       rpcprot_t);
63static bool_t pmapproc_change(struct svc_req *, SVCXPRT *, u_long);
64static bool_t pmapproc_getport(struct svc_req *, SVCXPRT *);
65static bool_t pmapproc_dump(struct svc_req *, SVCXPRT *);
66
67/*
68 * Called for all the version 2 inquiries.
69 */
70void
71pmap_service(struct svc_req *rqstp, SVCXPRT *xprt)
72{
73	rpcbs_procinfo(RPCBVERS_2_STAT, rqstp->rq_proc);
74	switch (rqstp->rq_proc) {
75	case PMAPPROC_NULL:
76		/*
77		 * Null proc call
78		 */
79#ifdef RPCBIND_DEBUG
80		if (debugging)
81			fprintf(stderr, "PMAPPROC_NULL\n");
82#endif
83		check_access(xprt, rqstp->rq_proc, NULL, PMAPVERS);
84		if ((!svc_sendreply(xprt, (xdrproc_t) xdr_void, NULL)) &&
85			debugging) {
86			if (doabort) {
87				rpcbind_abort();
88			}
89		}
90		break;
91
92	case PMAPPROC_SET:
93		/*
94		 * Set a program, version to port mapping
95		 */
96		pmapproc_change(rqstp, xprt, rqstp->rq_proc);
97		break;
98
99	case PMAPPROC_UNSET:
100		/*
101		 * Remove a program, version to port mapping.
102		 */
103		pmapproc_change(rqstp, xprt, rqstp->rq_proc);
104		break;
105
106	case PMAPPROC_GETPORT:
107		/*
108		 * Lookup the mapping for a program, version and return its
109		 * port number.
110		 */
111		pmapproc_getport(rqstp, xprt);
112		break;
113
114	case PMAPPROC_DUMP:
115		/*
116		 * Return the current set of mapped program, version
117		 */
118#ifdef RPCBIND_DEBUG
119		if (debugging)
120			fprintf(stderr, "PMAPPROC_DUMP\n");
121#endif
122		pmapproc_dump(rqstp, xprt);
123		break;
124
125	case PMAPPROC_CALLIT:
126		/*
127		 * Calls a procedure on the local machine. If the requested
128		 * procedure is not registered this procedure does not return
129		 * error information!!
130		 * This procedure is only supported on rpc/udp and calls via
131		 * rpc/udp. It passes null authentication parameters.
132		 */
133		rpcbproc_callit_com(rqstp, xprt, PMAPPROC_CALLIT, PMAPVERS);
134		break;
135
136	default:
137		svcerr_noproc(xprt);
138		break;
139	}
140}
141
142/*
143 * returns the item with the given program, version number. If that version
144 * number is not found, it returns the item with that program number, so that
145 * the port number is now returned to the caller. The caller when makes a
146 * call to this program, version number, the call will fail and it will
147 * return with PROGVERS_MISMATCH. The user can then determine the highest
148 * and the lowest version number for this program using clnt_geterr() and
149 * use those program version numbers.
150 */
151static struct pmaplist *
152find_service_pmap(rpcprog_t prog, rpcvers_t vers, rpcprot_t prot)
153{
154	register struct pmaplist *hit = NULL;
155	register struct pmaplist *pml;
156
157	for (pml = list_pml; pml != NULL; pml = pml->pml_next) {
158		if ((pml->pml_map.pm_prog != prog) ||
159			(pml->pml_map.pm_prot != prot))
160			continue;
161		hit = pml;
162		if (pml->pml_map.pm_vers == vers)
163			break;
164	}
165	return (hit);
166}
167
168static bool_t
169pmapproc_change(struct svc_req *rqstp __unused, SVCXPRT *xprt, unsigned long op)
170{
171	struct pmap reg;
172	RPCB rpcbreg;
173	long ans;
174	struct sockaddr_in *who;
175	uid_t uid;
176	char uidbuf[32];
177
178#ifdef RPCBIND_DEBUG
179	if (debugging)
180		fprintf(stderr, "%s request for (%lu, %lu) : ",
181		    op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
182		    reg.pm_prog, reg.pm_vers);
183#endif
184
185	if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
186		svcerr_decode(xprt);
187		return (FALSE);
188	}
189
190	if (!check_access(xprt, op, &reg, PMAPVERS)) {
191		svcerr_weakauth(xprt);
192		return FALSE;
193	}
194
195	who = svc_getcaller(xprt);
196
197	/*
198	 * Can't use getpwnam here. We might end up calling ourselves
199	 * and looping.
200	 */
201	if (__rpc_get_local_uid(xprt, &uid) < 0)
202		rpcbreg.r_owner = "unknown";
203	else if (uid == 0)
204		rpcbreg.r_owner = "superuser";
205	else {
206		/* r_owner will be strdup-ed later */
207		snprintf(uidbuf, sizeof uidbuf, "%d", uid);
208		rpcbreg.r_owner = uidbuf;
209	}
210
211	rpcbreg.r_prog = reg.pm_prog;
212	rpcbreg.r_vers = reg.pm_vers;
213
214	if (op == PMAPPROC_SET) {
215		char buf[32];
216
217		snprintf(buf, sizeof buf, "0.0.0.0.%d.%d",
218		    (int)((reg.pm_port >> 8) & 0xff),
219		    (int)(reg.pm_port & 0xff));
220		rpcbreg.r_addr = buf;
221		if (reg.pm_prot == IPPROTO_UDP) {
222			rpcbreg.r_netid = udptrans;
223		} else if (reg.pm_prot == IPPROTO_TCP) {
224			rpcbreg.r_netid = tcptrans;
225		} else {
226			ans = FALSE;
227			goto done_change;
228		}
229		ans = map_set(&rpcbreg, rpcbreg.r_owner);
230	} else if (op == PMAPPROC_UNSET) {
231		bool_t ans1, ans2;
232
233		rpcbreg.r_addr = NULL;
234		rpcbreg.r_netid = tcptrans;
235		ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
236		rpcbreg.r_netid = udptrans;
237		ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
238		ans = ans1 || ans2;
239	} else {
240		ans = FALSE;
241	}
242done_change:
243	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t) &ans)) &&
244	    debugging) {
245		fprintf(stderr, "portmap: svc_sendreply\n");
246		if (doabort) {
247			rpcbind_abort();
248		}
249	}
250#ifdef RPCBIND_DEBUG
251	if (debugging)
252		fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed");
253#endif
254	if (op == PMAPPROC_SET)
255		rpcbs_set(RPCBVERS_2_STAT, ans);
256	else
257		rpcbs_unset(RPCBVERS_2_STAT, ans);
258	return (TRUE);
259}
260
261/* ARGSUSED */
262static bool_t
263pmapproc_getport(struct svc_req *rqstp __unused, SVCXPRT *xprt)
264{
265	struct pmap reg;
266	long lport;
267	int port = 0;
268	struct pmaplist *fnd;
269#ifdef RPCBIND_DEBUG
270	char *uaddr;
271#endif
272
273	if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
274		svcerr_decode(xprt);
275		return (FALSE);
276	}
277
278	if (!check_access(xprt, PMAPPROC_GETPORT, &reg, PMAPVERS)) {
279		svcerr_weakauth(xprt);
280		return FALSE;
281	}
282
283#ifdef RPCBIND_DEBUG
284	if (debugging) {
285		uaddr =  taddr2uaddr(rpcbind_get_conf(xprt->xp_netid),
286			    svc_getrpccaller(xprt));
287		fprintf(stderr, "PMAP_GETPORT req for (%lu, %lu, %s) from %s :",
288			reg.pm_prog, reg.pm_vers,
289			reg.pm_prot == IPPROTO_UDP ? "udp" : "tcp", uaddr);
290		free(uaddr);
291	}
292#endif
293	fnd = find_service_pmap(reg.pm_prog, reg.pm_vers, reg.pm_prot);
294	if (fnd) {
295		char serveuaddr[32], *ua;
296		int h1, h2, h3, h4, p1, p2;
297		char *netid;
298
299		if (reg.pm_prot == IPPROTO_UDP) {
300			ua = udp_uaddr;
301			netid = udptrans;
302		} else {
303			ua = tcp_uaddr; /* To get the len */
304			netid = tcptrans;
305		}
306		if (ua == NULL) {
307			goto sendreply;
308		}
309		if (sscanf(ua, "%d.%d.%d.%d.%d.%d", &h1, &h2, &h3,
310				&h4, &p1, &p2) == 6) {
311			p1 = (fnd->pml_map.pm_port >> 8) & 0xff;
312			p2 = (fnd->pml_map.pm_port) & 0xff;
313			snprintf(serveuaddr, sizeof serveuaddr,
314			    "%d.%d.%d.%d.%d.%d", h1, h2, h3, h4, p1, p2);
315			if (is_bound(netid, serveuaddr)) {
316				port = fnd->pml_map.pm_port;
317			} else { /* this service is dead; delete it */
318				delete_prog(reg.pm_prog);
319			}
320		}
321	}
322sendreply:
323	lport = port;
324	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t)&lport)) &&
325			debugging) {
326		(void) fprintf(stderr, "portmap: svc_sendreply\n");
327		if (doabort) {
328			rpcbind_abort();
329		}
330	}
331#ifdef RPCBIND_DEBUG
332	if (debugging)
333		fprintf(stderr, "port = %d\n", port);
334#endif
335	rpcbs_getaddr(RPCBVERS_2_STAT, reg.pm_prog, reg.pm_vers,
336		reg.pm_prot == IPPROTO_UDP ? udptrans : tcptrans,
337		port ? udptrans : "");
338
339	return (TRUE);
340}
341
342/* ARGSUSED */
343static bool_t
344pmapproc_dump(struct svc_req *rqstp __unused, SVCXPRT *xprt)
345{
346	if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
347		svcerr_decode(xprt);
348		return (FALSE);
349	}
350
351	if (!check_access(xprt, PMAPPROC_DUMP, NULL, PMAPVERS)) {
352		svcerr_weakauth(xprt);
353		return FALSE;
354	}
355
356	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_pmaplist_ptr,
357			(caddr_t)&list_pml)) && debugging) {
358		if (debugging)
359			(void) fprintf(stderr, "portmap: svc_sendreply\n");
360		if (doabort) {
361			rpcbind_abort();
362		}
363	}
364	return (TRUE);
365}
366
367#endif /* PORTMAP */
368