pmap_svc.c revision 74627 
1/*	$NetBSD: pmap_svc.c,v 1.2 2000/10/20 11:49:40 fvdl Exp $	*/
2/*	$FreeBSD: head/usr.sbin/rpcbind/pmap_svc.c 74627 2001-03-22 04:31:30Z alfred $ */
3
4/*
5 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
6 * unrestricted use provided that this legend is included on all tape
7 * media and as a part of the software program in whole or part.  Users
8 * may copy or modify Sun RPC without charge, but are not authorized
9 * to license or distribute it to anyone else except as part of a product or
10 * program developed by the user.
11 *
12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
15 *
16 * Sun RPC is provided with no support and without any obligation on the
17 * part of Sun Microsystems, Inc. to assist in its use, correction,
18 * modification or enhancement.
19 *
20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
22 * OR ANY PART THEREOF.
23 *
24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
25 * or profits or other special, indirect and consequential damages, even if
26 * Sun has been advised of the possibility of such damages.
27 *
28 * Sun Microsystems, Inc.
29 * 2550 Garcia Avenue
30 * Mountain View, California  94043
31 */
32/*
33 * Copyright (c) 1984 - 1991 by Sun Microsystems, Inc.
34 */
35
36/* #ident	"@(#)pmap_svc.c	1.14	93/07/05 SMI" */
37
38#if 0
39#ifndef lint
40static	char sccsid[] = "@(#)pmap_svc.c 1.23 89/04/05 Copyr 1984 Sun Micro";
41#endif
42#endif
43
44/*
45 * pmap_svc.c
46 * The server procedure for the version 2 portmaper.
47 * All the portmapper related interface from the portmap side.
48 */
49
50#ifdef PORTMAP
51#include <sys/types.h>
52#include <sys/socket.h>
53#include <stdio.h>
54#include <rpc/rpc.h>
55#include <rpc/pmap_prot.h>
56#include <rpc/rpcb_prot.h>
57#ifdef RPCBIND_DEBUG
58#include <stdlib.h>
59#endif
60#include "rpcbind.h"
61
62static struct pmaplist *find_service_pmap __P((rpcprog_t, rpcvers_t,
63					       rpcprot_t));
64static bool_t pmapproc_change __P((struct svc_req *, SVCXPRT *, u_long));
65static bool_t pmapproc_getport __P((struct svc_req *, SVCXPRT *));
66static bool_t pmapproc_dump __P((struct svc_req *, SVCXPRT *));
67
68/*
69 * Called for all the version 2 inquiries.
70 */
71void
72pmap_service(struct svc_req *rqstp, SVCXPRT *xprt)
73{
74	rpcbs_procinfo(RPCBVERS_2_STAT, rqstp->rq_proc);
75	switch (rqstp->rq_proc) {
76	case PMAPPROC_NULL:
77		/*
78		 * Null proc call
79		 */
80#ifdef RPCBIND_DEBUG
81		if (debugging)
82			fprintf(stderr, "PMAPPROC_NULL\n");
83#endif
84		check_access(xprt, rqstp->rq_proc, NULL, PMAPVERS);
85		if ((!svc_sendreply(xprt, (xdrproc_t) xdr_void, NULL)) &&
86			debugging) {
87			if (doabort) {
88				rpcbind_abort();
89			}
90		}
91		break;
92
93	case PMAPPROC_SET:
94		/*
95		 * Set a program, version to port mapping
96		 */
97		pmapproc_change(rqstp, xprt, rqstp->rq_proc);
98		break;
99
100	case PMAPPROC_UNSET:
101		/*
102		 * Remove a program, version to port mapping.
103		 */
104		pmapproc_change(rqstp, xprt, rqstp->rq_proc);
105		break;
106
107	case PMAPPROC_GETPORT:
108		/*
109		 * Lookup the mapping for a program, version and return its
110		 * port number.
111		 */
112		pmapproc_getport(rqstp, xprt);
113		break;
114
115	case PMAPPROC_DUMP:
116		/*
117		 * Return the current set of mapped program, version
118		 */
119#ifdef RPCBIND_DEBUG
120		if (debugging)
121			fprintf(stderr, "PMAPPROC_DUMP\n");
122#endif
123		pmapproc_dump(rqstp, xprt);
124		break;
125
126	case PMAPPROC_CALLIT:
127		/*
128		 * Calls a procedure on the local machine. If the requested
129		 * procedure is not registered this procedure does not return
130		 * error information!!
131		 * This procedure is only supported on rpc/udp and calls via
132		 * rpc/udp. It passes null authentication parameters.
133		 */
134		rpcbproc_callit_com(rqstp, xprt, PMAPPROC_CALLIT, PMAPVERS);
135		break;
136
137	default:
138		svcerr_noproc(xprt);
139		break;
140	}
141}
142
143/*
144 * returns the item with the given program, version number. If that version
145 * number is not found, it returns the item with that program number, so that
146 * the port number is now returned to the caller. The caller when makes a
147 * call to this program, version number, the call will fail and it will
148 * return with PROGVERS_MISMATCH. The user can then determine the highest
149 * and the lowest version number for this program using clnt_geterr() and
150 * use those program version numbers.
151 */
152static struct pmaplist *
153find_service_pmap(rpcprog_t prog, rpcvers_t vers, rpcprot_t prot)
154{
155	register struct pmaplist *hit = NULL;
156	register struct pmaplist *pml;
157
158	for (pml = list_pml; pml != NULL; pml = pml->pml_next) {
159		if ((pml->pml_map.pm_prog != prog) ||
160			(pml->pml_map.pm_prot != prot))
161			continue;
162		hit = pml;
163		if (pml->pml_map.pm_vers == vers)
164			break;
165	}
166	return (hit);
167}
168
169static bool_t
170pmapproc_change(struct svc_req *rqstp, SVCXPRT *xprt, unsigned long op)
171{
172	struct pmap reg;
173	RPCB rpcbreg;
174	long ans;
175	struct sockaddr_in *who;
176	uid_t uid;
177	char uidbuf[32];
178
179#ifdef RPCBIND_DEBUG
180	if (debugging)
181		fprintf(stderr, "%s request for (%lu, %lu) : ",
182		    op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
183		    reg.pm_prog, reg.pm_vers);
184#endif
185
186	if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
187		svcerr_decode(xprt);
188		return (FALSE);
189	}
190
191	if (!check_access(xprt, op, &reg, PMAPVERS)) {
192		svcerr_weakauth(xprt);
193		return FALSE;
194	}
195
196	who = svc_getcaller(xprt);
197
198	/*
199	 * Can't use getpwnam here. We might end up calling ourselves
200	 * and looping.
201	 */
202	if (__rpc_get_local_uid(xprt, &uid) < 0)
203		rpcbreg.r_owner = "unknown";
204	else if (uid == 0)
205		rpcbreg.r_owner = "superuser";
206	else {
207		/* r_owner will be strdup-ed later */
208		snprintf(uidbuf, sizeof uidbuf, "%d", uid);
209		rpcbreg.r_owner = uidbuf;
210	}
211
212	rpcbreg.r_prog = reg.pm_prog;
213	rpcbreg.r_vers = reg.pm_vers;
214
215	if (op == PMAPPROC_SET) {
216		char buf[32];
217
218		sprintf(buf, "0.0.0.0.%d.%d", (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, 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			sprintf(serveuaddr, "%d.%d.%d.%d.%d.%d",
314				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, 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