xref: /freebsd/usr.sbin/rpcbind/pmap_svc.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*	$NetBSD: pmap_svc.c,v 1.2 2000/10/20 11:49:40 fvdl Exp $	*/
2 /*	$FreeBSD$ */
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
40 static	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 
62 static struct pmaplist *find_service_pmap(rpcprog_t, rpcvers_t,
63 					       rpcprot_t);
64 static bool_t pmapproc_change(struct svc_req *, SVCXPRT *, u_long);
65 static bool_t pmapproc_getport(struct svc_req *, SVCXPRT *);
66 static bool_t pmapproc_dump(struct svc_req *, SVCXPRT *);
67 
68 /*
69  * Called for all the version 2 inquiries.
70  */
71 void
72 pmap_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  */
152 static struct pmaplist *
153 find_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 
169 static bool_t
170 pmapproc_change(struct svc_req *rqstp __unused, 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 		snprintf(buf, sizeof buf, "0.0.0.0.%d.%d",
219 		    (int)((reg.pm_port >> 8) & 0xff),
220 		    (int)(reg.pm_port & 0xff));
221 		rpcbreg.r_addr = buf;
222 		if (reg.pm_prot == IPPROTO_UDP) {
223 			rpcbreg.r_netid = udptrans;
224 		} else if (reg.pm_prot == IPPROTO_TCP) {
225 			rpcbreg.r_netid = tcptrans;
226 		} else {
227 			ans = FALSE;
228 			goto done_change;
229 		}
230 		ans = map_set(&rpcbreg, rpcbreg.r_owner);
231 	} else if (op == PMAPPROC_UNSET) {
232 		bool_t ans1, ans2;
233 
234 		rpcbreg.r_addr = NULL;
235 		rpcbreg.r_netid = tcptrans;
236 		ans1 = map_unset(&rpcbreg, rpcbreg.r_owner);
237 		rpcbreg.r_netid = udptrans;
238 		ans2 = map_unset(&rpcbreg, rpcbreg.r_owner);
239 		ans = ans1 || ans2;
240 	} else {
241 		ans = FALSE;
242 	}
243 done_change:
244 	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t) &ans)) &&
245 	    debugging) {
246 		fprintf(stderr, "portmap: svc_sendreply\n");
247 		if (doabort) {
248 			rpcbind_abort();
249 		}
250 	}
251 #ifdef RPCBIND_DEBUG
252 	if (debugging)
253 		fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed");
254 #endif
255 	if (op == PMAPPROC_SET)
256 		rpcbs_set(RPCBVERS_2_STAT, ans);
257 	else
258 		rpcbs_unset(RPCBVERS_2_STAT, ans);
259 	return (TRUE);
260 }
261 
262 /* ARGSUSED */
263 static bool_t
264 pmapproc_getport(struct svc_req *rqstp __unused, SVCXPRT *xprt)
265 {
266 	struct pmap reg;
267 	long lport;
268 	int port = 0;
269 	struct pmaplist *fnd;
270 #ifdef RPCBIND_DEBUG
271 	char *uaddr;
272 #endif
273 
274 	if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)&reg)) {
275 		svcerr_decode(xprt);
276 		return (FALSE);
277 	}
278 
279 	if (!check_access(xprt, PMAPPROC_GETPORT, &reg, PMAPVERS)) {
280 		svcerr_weakauth(xprt);
281 		return FALSE;
282 	}
283 
284 #ifdef RPCBIND_DEBUG
285 	if (debugging) {
286 		uaddr =  taddr2uaddr(rpcbind_get_conf(xprt->xp_netid),
287 			    svc_getrpccaller(xprt));
288 		fprintf(stderr, "PMAP_GETPORT req for (%lu, %lu, %s) from %s :",
289 			reg.pm_prog, reg.pm_vers,
290 			reg.pm_prot == IPPROTO_UDP ? "udp" : "tcp", uaddr);
291 		free(uaddr);
292 	}
293 #endif
294 	fnd = find_service_pmap(reg.pm_prog, reg.pm_vers, reg.pm_prot);
295 	if (fnd) {
296 		char serveuaddr[32], *ua;
297 		int h1, h2, h3, h4, p1, p2;
298 		char *netid;
299 
300 		if (reg.pm_prot == IPPROTO_UDP) {
301 			ua = udp_uaddr;
302 			netid = udptrans;
303 		} else {
304 			ua = tcp_uaddr; /* To get the len */
305 			netid = tcptrans;
306 		}
307 		if (ua == NULL) {
308 			goto sendreply;
309 		}
310 		if (sscanf(ua, "%d.%d.%d.%d.%d.%d", &h1, &h2, &h3,
311 				&h4, &p1, &p2) == 6) {
312 			p1 = (fnd->pml_map.pm_port >> 8) & 0xff;
313 			p2 = (fnd->pml_map.pm_port) & 0xff;
314 			snprintf(serveuaddr, sizeof serveuaddr,
315 			    "%d.%d.%d.%d.%d.%d", h1, h2, h3, h4, p1, p2);
316 			if (is_bound(netid, serveuaddr)) {
317 				port = fnd->pml_map.pm_port;
318 			} else { /* this service is dead; delete it */
319 				delete_prog(reg.pm_prog);
320 			}
321 		}
322 	}
323 sendreply:
324 	lport = port;
325 	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_long, (caddr_t)&lport)) &&
326 			debugging) {
327 		(void) fprintf(stderr, "portmap: svc_sendreply\n");
328 		if (doabort) {
329 			rpcbind_abort();
330 		}
331 	}
332 #ifdef RPCBIND_DEBUG
333 	if (debugging)
334 		fprintf(stderr, "port = %d\n", port);
335 #endif
336 	rpcbs_getaddr(RPCBVERS_2_STAT, reg.pm_prog, reg.pm_vers,
337 		reg.pm_prot == IPPROTO_UDP ? udptrans : tcptrans,
338 		port ? udptrans : "");
339 
340 	return (TRUE);
341 }
342 
343 /* ARGSUSED */
344 static bool_t
345 pmapproc_dump(struct svc_req *rqstp __unused, SVCXPRT *xprt)
346 {
347 	if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
348 		svcerr_decode(xprt);
349 		return (FALSE);
350 	}
351 
352 	if (!check_access(xprt, PMAPPROC_DUMP, NULL, PMAPVERS)) {
353 		svcerr_weakauth(xprt);
354 		return FALSE;
355 	}
356 
357 	if ((!svc_sendreply(xprt, (xdrproc_t) xdr_pmaplist_ptr,
358 			(caddr_t)&list_pml)) && debugging) {
359 		if (debugging)
360 			(void) fprintf(stderr, "portmap: svc_sendreply\n");
361 		if (doabort) {
362 			rpcbind_abort();
363 		}
364 	}
365 	return (TRUE);
366 }
367 
368 #endif /* PORTMAP */
369