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
54 static struct pmaplist *find_service_pmap(rpcprog_t, rpcvers_t,
55 rpcprot_t);
56 static bool_t pmapproc_change(struct svc_req *, SVCXPRT *, u_long);
57 static bool_t pmapproc_getport(struct svc_req *, SVCXPRT *);
58 static bool_t pmapproc_dump(struct svc_req *, SVCXPRT *);
59
60 /*
61 * Called for all the version 2 inquiries.
62 */
63 void
pmap_service(struct svc_req * rqstp,SVCXPRT * xprt)64 pmap_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 */
144 static struct pmaplist *
find_service_pmap(rpcprog_t prog,rpcvers_t vers,rpcprot_t prot)145 find_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
161 static bool_t
pmapproc_change(struct svc_req * rqstp __unused,SVCXPRT * xprt,unsigned long op)162 pmapproc_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 *)®)) {
179 svcerr_decode(xprt);
180 return (FALSE);
181 }
182
183 if (!check_access(xprt, op, ®, 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 }
235 done_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 */
255 static bool_t
pmapproc_getport(struct svc_req * rqstp __unused,SVCXPRT * xprt)256 pmapproc_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 *)®)) {
267 svcerr_decode(xprt);
268 return (FALSE);
269 }
270
271 if (!check_access(xprt, PMAPPROC_GETPORT, ®, 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 }
315 sendreply:
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 */
336 static bool_t
pmapproc_dump(struct svc_req * rqstp __unused,SVCXPRT * xprt)337 pmapproc_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