1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25 /*
26 * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
27 */
28
29 /*
30 * rpcb_svc_4.c
31 * The server procedure for the version 4 rpcbind.
32 *
33 */
34
35 #include <stdio.h>
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <unistd.h>
39 #include <rpc/rpc.h>
40 #include <netconfig.h>
41 #include <syslog.h>
42 #include <netdir.h>
43 #include <string.h>
44 #include <stdlib.h>
45 #include "rpcbind.h"
46
47 static void free_rpcb_entry_list(rpcb_entry_list_ptr);
48 static bool_t xdr_rpcb_entry_list_ptr_wrap(XDR *, rpcb_entry_list_ptr *);
49 static bool_t rpcbproc_getaddrlist(rpcb *, rpcb_entry_list_ptr *,
50 struct svc_req *);
51
52 /*
53 * Called by svc_getreqset. There is a separate server handle for
54 * every transport that it waits on.
55 */
56 void
rpcb_service_4(struct svc_req * rqstp,SVCXPRT * transp)57 rpcb_service_4(struct svc_req *rqstp, SVCXPRT *transp)
58 {
59 union {
60 rpcb rpcbproc_set_4_arg;
61 rpcb rpcbproc_unset_4_arg;
62 rpcb rpcbproc_getaddr_4_arg;
63 char *rpcbproc_uaddr2taddr_4_arg;
64 struct netbuf rpcbproc_taddr2uaddr_4_arg;
65 rpcb rpcbproc_getversaddr_4_arg;
66 rpcb rpcbproc_getaddrlist_4_arg;
67 } argument;
68 union {
69 bool_t rpcbproc_set_4_res;
70 bool_t rpcbproc_unset_4_res;
71 char *rpcbproc_getaddr_4_res;
72 rpcblist_ptr *rpcbproc_dump_4_res;
73 ulong_t rpcbproc_gettime_4_res;
74 struct netbuf rpcbproc_uaddr2taddr_4_res;
75 char *rpcbproc_taddr2uaddr_4_res;
76 char *rpcbproc_getversaddr_4_res;
77 rpcb_entry_list_ptr rpcbproc_getaddrlist_4_res;
78 rpcb_stat_byvers *rpcbproc_getstat_4_res;
79 } result;
80 bool_t retval;
81 xdrproc_t xdr_argument, xdr_result;
82 bool_t (*local)();
83
84 rpcbs_procinfo(RPCBVERS_4_STAT, rqstp->rq_proc);
85
86 RPCB_CHECK(transp, rqstp->rq_proc);
87
88 switch (rqstp->rq_proc) {
89 case NULLPROC:
90 /*
91 * Null proc call
92 */
93 (void) svc_sendreply(transp, (xdrproc_t)xdr_void, (char *)NULL);
94 return;
95
96 case RPCBPROC_SET:
97 /*
98 * Check to see whether the message came from
99 * loopback transports (for security reasons)
100 */
101 if (strcasecmp(transp->xp_netid, loopback_dg) &&
102 strcasecmp(transp->xp_netid, loopback_vc) &&
103 strcasecmp(transp->xp_netid, loopback_vc_ord)) {
104 syslog(LOG_ERR, "non-local attempt to set");
105 svcerr_weakauth(transp);
106 return;
107 }
108 xdr_argument = xdr_rpcb;
109 xdr_result = xdr_bool;
110 local = (bool_t (*)()) rpcbproc_set_com;
111 break;
112
113 case RPCBPROC_UNSET:
114 /*
115 * Check to see whether the message came from
116 * loopback transports (for security reasons)
117 */
118 if (strcasecmp(transp->xp_netid, loopback_dg) &&
119 strcasecmp(transp->xp_netid, loopback_vc) &&
120 strcasecmp(transp->xp_netid, loopback_vc_ord)) {
121 syslog(LOG_ERR, "non-local attempt to unset");
122 svcerr_weakauth(transp);
123 return;
124 }
125 xdr_argument = xdr_rpcb;
126 xdr_result = xdr_bool;
127 local = (bool_t (*)()) rpcbproc_unset_com;
128 break;
129
130 case RPCBPROC_GETADDR:
131 xdr_argument = xdr_rpcb;
132 xdr_result = xdr_wrapstring;
133 local = (bool_t (*)()) rpcbproc_getaddr_com;
134 break;
135
136 case RPCBPROC_DUMP:
137 xdr_argument = xdr_void;
138 xdr_result = xdr_rpcblist_ptr_ptr;
139 local = (bool_t (*)()) rpcbproc_dump_com;
140 break;
141
142 case RPCBPROC_BCAST:
143 rpcbproc_callit_com(rqstp, transp, rqstp->rq_proc, RPCBVERS4);
144 return;
145
146 case RPCBPROC_GETTIME:
147 xdr_argument = xdr_void;
148 xdr_result = xdr_u_long;
149 local = (bool_t (*)()) rpcbproc_gettime_com;
150 break;
151
152 case RPCBPROC_UADDR2TADDR:
153 xdr_argument = xdr_wrapstring;
154 xdr_result = xdr_netbuf;
155 local = (bool_t (*)()) rpcbproc_uaddr2taddr_com;
156 break;
157
158 case RPCBPROC_TADDR2UADDR:
159 xdr_argument = xdr_netbuf;
160 xdr_result = xdr_wrapstring;
161 local = (bool_t (*)()) rpcbproc_taddr2uaddr_com;
162 break;
163
164 case RPCBPROC_GETVERSADDR:
165 xdr_argument = xdr_rpcb;
166 xdr_result = xdr_wrapstring;
167 local = (bool_t (*)()) rpcbproc_getaddr_com;
168 break;
169
170 case RPCBPROC_INDIRECT:
171 rpcbproc_callit_com(rqstp, transp, rqstp->rq_proc, RPCBVERS4);
172 return;
173
174 case RPCBPROC_GETADDRLIST:
175 xdr_argument = xdr_rpcb;
176 xdr_result = xdr_rpcb_entry_list_ptr_wrap;
177 local = (bool_t (*)()) rpcbproc_getaddrlist;
178 break;
179
180 case RPCBPROC_GETSTAT:
181 xdr_argument = xdr_void;
182 xdr_result = xdr_rpcb_stat_byvers_ptr;
183 local = (bool_t (*)()) rpcbproc_getstat;
184 break;
185
186 default:
187 svcerr_noproc(transp);
188 return;
189 }
190 (void) memset((char *)&argument, 0, sizeof (argument));
191 if (!svc_getargs(transp, xdr_argument, (char *)&argument)) {
192 svcerr_decode(transp);
193 if (debugging)
194 (void) fprintf(stderr, "rpcbind: could not decode\n");
195 return;
196 }
197 retval = (*local)(&argument, &result, rqstp, RPCBVERS4);
198 if (retval > 0 && !svc_sendreply(transp, xdr_result, (char *)&result)) {
199 svcerr_systemerr(transp);
200 if (debugging) {
201 (void) fprintf(stderr, "rpcbind: svc_sendreply\n");
202 if (doabort) {
203 rpcbind_abort();
204 }
205 }
206 }
207 if (!svc_freeargs(transp, xdr_argument, (char *)&argument)) {
208 if (debugging) {
209 (void) fprintf(stderr, "unable to free arguments\n");
210 if (doabort) {
211 rpcbind_abort();
212 }
213 }
214 }
215
216 xdr_free(xdr_result, (char *)&result);
217 }
218
219 /*
220 * Lookup the mapping for a program, version and return the
221 * addresses for all transports in the current transport family.
222 * We return a merged address.
223 */
224 static bool_t
rpcbproc_getaddrlist(rpcb * regp,rpcb_entry_list_ptr * result,struct svc_req * rqstp)225 rpcbproc_getaddrlist(rpcb *regp, rpcb_entry_list_ptr *result,
226 struct svc_req *rqstp)
227 {
228 rpcb_entry_list_ptr rlist = *result = NULL;
229 rpcblist_ptr rbl, next, prev;
230 rpcb_entry_list_ptr rp, tail = NULL;
231 ulong_t prog, vers;
232 rpcb_entry *a;
233 struct netconfig *nconf;
234 struct netconfig *reg_nconf;
235 char *saddr, *maddr = NULL;
236 struct netconfig *trans_conf; /* transport netconfig */
237 SVCXPRT *transp = rqstp->rq_xprt;
238
239 /*
240 * Deal with a possible window during which we could return an IPv6
241 * address when the caller wanted IPv4. See the comments in
242 * rpcbproc_getaddr_com() for more details.
243 */
244 trans_conf = rpcbind_get_conf(transp->xp_netid);
245 if (strcmp(trans_conf->nc_protofmly, NC_INET6) == 0) {
246 struct sockaddr_in6 *rmtaddr;
247
248 rmtaddr = (struct sockaddr_in6 *)transp->xp_rtaddr.buf;
249 if (IN6_IS_ADDR_V4MAPPED(&rmtaddr->sin6_addr)) {
250 syslog(LOG_DEBUG,
251 "IPv4 GETADDRLIST request mapped "
252 "to IPv6: ignoring");
253 return (FALSE);
254 }
255 }
256
257 prog = regp->r_prog;
258 vers = regp->r_vers;
259 reg_nconf = rpcbind_get_conf(transp->xp_netid);
260 if (reg_nconf == NULL)
261 return (FALSE);
262 if (*(regp->r_addr) != '\0') {
263 saddr = regp->r_addr;
264 } else {
265 saddr = NULL;
266 }
267
268 prev = NULL;
269 (void) rw_wrlock(&list_rbl_lock);
270 for (rbl = list_rbl; rbl != NULL; rbl = next) {
271 next = rbl->rpcb_next;
272 if ((rbl->rpcb_map.r_prog == prog) &&
273 (rbl->rpcb_map.r_vers == vers)) {
274 nconf = rpcbind_get_conf(rbl->rpcb_map.r_netid);
275 if (nconf == NULL) {
276 (void) rw_unlock(&list_rbl_lock);
277 goto fail;
278 }
279 if (strcmp(nconf->nc_protofmly, reg_nconf->nc_protofmly)
280 != 0) {
281 prev = rbl;
282 continue; /* not same proto family */
283 }
284 if ((maddr = mergeaddr(transp, rbl->rpcb_map.r_netid,
285 rbl->rpcb_map.r_addr, saddr)) == NULL) {
286 prev = rbl;
287 continue;
288 } else if (!maddr[0]) {
289 /*
290 * The server died, remove this rpcb_map element
291 * from the list and free it.
292 */
293 #ifdef PORTMAP
294 (void) rw_wrlock(&list_pml_lock);
295 (void) del_pmaplist(&rbl->rpcb_map);
296 (void) rw_unlock(&list_pml_lock);
297 #endif
298 (void) delete_rbl(rbl);
299
300 if (prev == NULL)
301 list_rbl = next;
302 else
303 prev->rpcb_next = next;
304 continue;
305 }
306 /*
307 * Add it to rlist.
308 */
309 rp = (rpcb_entry_list_ptr)
310 malloc((uint_t)sizeof (rpcb_entry_list));
311 if (rp == NULL) {
312 (void) rw_unlock(&list_rbl_lock);
313 goto fail;
314 }
315 a = &rp->rpcb_entry_map;
316 a->r_maddr = maddr;
317 a->r_nc_netid = nconf->nc_netid;
318 a->r_nc_semantics = nconf->nc_semantics;
319 a->r_nc_protofmly = nconf->nc_protofmly;
320 a->r_nc_proto = nconf->nc_proto;
321 rp->rpcb_entry_next = NULL;
322 if (rlist == NULL) {
323 rlist = rp;
324 tail = rp;
325 } else {
326 tail->rpcb_entry_next = rp;
327 tail = rp;
328 }
329 rp = NULL;
330 }
331 prev = rbl;
332 }
333 (void) rw_unlock(&list_rbl_lock);
334
335 /*
336 * XXX: getaddrlist info is also being stuffed into getaddr.
337 * Perhaps wrong, but better than it not getting counted at all.
338 */
339 rpcbs_getaddr(RPCBVERS_4_STAT, prog, vers, transp->xp_netid, maddr);
340
341 *result = rlist;
342 return (TRUE);
343
344 fail:
345 free_rpcb_entry_list(rlist);
346 return (FALSE);
347 }
348
349 /*
350 * Free only the allocated structure, rest is all a pointer to some
351 * other data somewhere else.
352 */
353 static void
free_rpcb_entry_list(rpcb_entry_list_ptr rlist)354 free_rpcb_entry_list(rpcb_entry_list_ptr rlist)
355 {
356 while (rlist != NULL) {
357 rpcb_entry_list_ptr tmp = rlist;
358 rlist = rlist->rpcb_entry_next;
359 free(tmp->rpcb_entry_map.r_maddr);
360 free(tmp);
361 }
362 }
363
364 static bool_t
xdr_rpcb_entry_list_ptr_wrap(XDR * xdrs,rpcb_entry_list_ptr * rp)365 xdr_rpcb_entry_list_ptr_wrap(XDR *xdrs, rpcb_entry_list_ptr *rp)
366 {
367 if (xdrs->x_op == XDR_FREE) {
368 free_rpcb_entry_list(*rp);
369 return (TRUE);
370 }
371
372 return (xdr_rpcb_entry_list_ptr(xdrs, rp));
373 }
374