xref: /minix/tests/fs/nfs/nfsservice/rpcbind/pmap_svc.c (revision 11be35a1)
1 /*	$NetBSD: pmap_svc.c,v 1.1 2010/07/26 15:53:00 pooka Exp $	*/
2 
3 /*
4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5  * unrestricted use provided that this legend is included on all tape
6  * media and as a part of the software program in whole or part.  Users
7  * may copy or modify Sun RPC without charge, but are not authorized
8  * to license or distribute it to anyone else except as part of a product or
9  * program developed by the user.
10  *
11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14  *
15  * Sun RPC is provided with no support and without any obligation on the
16  * part of Sun Microsystems, Inc. to assist in its use, correction,
17  * modification or enhancement.
18  *
19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21  * OR ANY PART THEREOF.
22  *
23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24  * or profits or other special, indirect and consequential damages, even if
25  * Sun has been advised of the possibility of such damages.
26  *
27  * Sun Microsystems, Inc.
28  * 2550 Garcia Avenue
29  * Mountain View, California  94043
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
39 static	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 portmapper.
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 
61 static struct pmaplist *find_service_pmap(rpcprog_t, rpcvers_t, rpcprot_t);
62 static bool_t pmapproc_change(struct svc_req *, SVCXPRT *, u_long);
63 static bool_t pmapproc_getport(struct svc_req *, SVCXPRT *);
64 static bool_t pmapproc_dump(struct svc_req *, SVCXPRT *);
65 
66 /*
67  * Called for all the version 2 inquiries.
68  */
69 void
70 pmap_service(struct svc_req *rqstp, SVCXPRT *xprt)
71 {
72 	rpcbs_procinfo(RPCBVERS_2_STAT, rqstp->rq_proc);
73 	switch (rqstp->rq_proc) {
74 	case PMAPPROC_NULL:
75 		/*
76 		 * Null proc call
77 		 */
78 #ifdef RPCBIND_DEBUG
79 		if (debugging)
80 			fprintf(stderr, "PMAPPROC_NULL\n");
81 #endif
82 		check_access(xprt, rqstp->rq_proc, NULL, PMAPVERS);
83 		if ((!svc_sendreply(xprt, (xdrproc_t) xdr_void, NULL)) &&
84 			debugging) {
85 			if (doabort) {
86 				rpcbind_abort();
87 			}
88 		}
89 		break;
90 
91 	case PMAPPROC_SET:
92 		/*
93 		 * Set a program, version to port mapping
94 		 */
95 		pmapproc_change(rqstp, xprt, rqstp->rq_proc);
96 		break;
97 
98 	case PMAPPROC_UNSET:
99 		/*
100 		 * Remove a program, version to port mapping.
101 		 */
102 		pmapproc_change(rqstp, xprt, rqstp->rq_proc);
103 		break;
104 
105 	case PMAPPROC_GETPORT:
106 		/*
107 		 * Lookup the mapping for a program, version and return its
108 		 * port number.
109 		 */
110 		pmapproc_getport(rqstp, xprt);
111 		break;
112 
113 	case PMAPPROC_DUMP:
114 		/*
115 		 * Return the current set of mapped program, version
116 		 */
117 #ifdef RPCBIND_DEBUG
118 		if (debugging)
119 			fprintf(stderr, "PMAPPROC_DUMP\n");
120 #endif
121 		pmapproc_dump(rqstp, xprt);
122 		break;
123 
124 	case PMAPPROC_CALLIT:
125 		/*
126 		 * Calls a procedure on the local machine. If the requested
127 		 * procedure is not registered this procedure does not return
128 		 * error information!!
129 		 * This procedure is only supported on rpc/udp and calls via
130 		 * rpc/udp. It passes null authentication parameters.
131 		 */
132 		rpcbproc_callit_com(rqstp, xprt, PMAPPROC_CALLIT, PMAPVERS);
133 		break;
134 
135 	default:
136 		svcerr_noproc(xprt);
137 		break;
138 	}
139 }
140 
141 /*
142  * returns the item with the given program, version number. If that version
143  * number is not found, it returns the item with that program number, so that
144  * the port number is now returned to the caller. The caller when makes a
145  * call to this program, version number, the call will fail and it will
146  * return with PROGVERS_MISMATCH. The user can then determine the highest
147  * and the lowest version number for this program using clnt_geterr() and
148  * use those program version numbers.
149  */
150 static struct pmaplist *
151 find_service_pmap(rpcprog_t prog, rpcvers_t vers, rpcprot_t prot)
152 {
153 	register struct pmaplist *hit = NULL;
154 	register struct pmaplist *pml;
155 
156 	for (pml = list_pml; pml != NULL; pml = pml->pml_next) {
157 		if ((pml->pml_map.pm_prog != prog) ||
158 			(pml->pml_map.pm_prot != prot))
159 			continue;
160 		hit = pml;
161 		if (pml->pml_map.pm_vers == vers)
162 			break;
163 	}
164 	return (hit);
165 }
166 
167 static bool_t
168 pmapproc_change(struct svc_req *rqstp, SVCXPRT *xprt, unsigned long op)
169 {
170 	struct pmap reg;
171 	RPCB rpcbreg;
172 	long ans;
173 	struct sockaddr_in *who;
174 	struct sockcred *sc;
175 	char uidbuf[32];
176 
177 #ifdef RPCBIND_DEBUG
178 	if (debugging)
179 		fprintf(stderr, "%s request for (%lu, %lu) : ",
180 		    op == PMAPPROC_SET ? "PMAP_SET" : "PMAP_UNSET",
181 		    reg.pm_prog, reg.pm_vers);
182 #endif
183 
184 	if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
185 		svcerr_decode(xprt);
186 		return (FALSE);
187 	}
188 
189 	if (!check_access(xprt, op, &reg, PMAPVERS)) {
190 		svcerr_weakauth(xprt);
191 		return FALSE;
192 	}
193 
194 	who = svc_getcaller(xprt);
195 	sc = __svc_getcallercreds(xprt);
196 
197 	/*
198 	 * Can't use getpwnam here. We might end up calling ourselves
199 	 * and looping.
200 	 */
201 	if (sc == NULL)
202 		rpcbreg.r_owner = __UNCONST(rpcbind_unknown);
203 	else if (sc->sc_uid == 0)
204 		rpcbreg.r_owner = __UNCONST(rpcbind_superuser);
205 	else {
206 		/* r_owner will be strdup-ed later */
207 		snprintf(uidbuf, sizeof uidbuf, "%d", sc->sc_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 = __UNCONST(udptrans);
223 		} else if (reg.pm_prot == IPPROTO_TCP) {
224 			rpcbreg.r_netid = __UNCONST(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 = __UNCONST(tcptrans);
235 		ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
236 		rpcbreg.r_netid = __UNCONST(udptrans);
237 		ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
238 		ans = ans1 || ans2;
239 	} else {
240 		ans = FALSE;
241 	}
242 done_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 */
262 static bool_t
263 pmapproc_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];
296 		int h1, h2, h3, h4, p1, p2;
297 		const char *netid, *ua;
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 	}
322 sendreply:
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 */
343 static bool_t
344 pmapproc_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