1 /* $NetBSD: svc_simple.c,v 1.20 2000/07/06 03:10:35 christos 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) 1986-1991 by Sun Microsystems Inc.
34 */
35
36 /* #pragma ident "@(#)svc_simple.c 1.18 94/04/24 SMI" */
37 /*
38 * svc_simple.c
39 * Simplified front end to rpc.
40 */
41
42 /*
43 * This interface creates a virtual listener for all the services
44 * started through rpc_reg(). It listens on the same endpoint for
45 * all the services and then executes the corresponding service
46 * for the given prognum and procnum.
47 */
48
49 #include "namespace.h"
50 #include "reentrant.h"
51 #include <sys/types.h>
52 #include <rpc/rpc.h>
53 #include <rpc/nettype.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <err.h>
58 #include "un-namespace.h"
59
60 #include "rpc_com.h"
61 #include "mt_misc.h"
62
63 static void universal(struct svc_req *, SVCXPRT *);
64
65 static struct proglst {
66 char *(*p_progname)(char *);
67 rpcprog_t p_prognum;
68 rpcvers_t p_versnum;
69 rpcproc_t p_procnum;
70 SVCXPRT *p_transp;
71 char *p_netid;
72 char *p_xdrbuf;
73 int p_recvsz;
74 xdrproc_t p_inproc, p_outproc;
75 struct proglst *p_nxt;
76 } *proglst;
77
78 static const char rpc_reg_err[] = "%s: %s";
79 static const char rpc_reg_msg[] = "rpc_reg: ";
80 static const char __reg_err1[] = "can't find appropriate transport";
81 static const char __reg_err2[] = "can't get protocol info";
82 static const char __reg_err3[] = "unsupported transport size";
83 static const char __no_mem_str[] = "out of memory";
84
85 /*
86 * For simplified, easy to use kind of rpc interfaces.
87 * nettype indicates the type of transport on which the service will be
88 * listening. Used for conservation of the system resource. Only one
89 * handle is created for all the services (actually one of each netid)
90 * and same xdrbuf is used for same netid. The size of the arguments
91 * is also limited by the recvsize for that transport, even if it is
92 * a COTS transport. This may be wrong, but for cases like these, they
93 * should not use the simplified interfaces like this.
94 *
95 * prognum - program number
96 * versnum - version number
97 * procnum - procedure number
98 * progname - Server routine
99 * inproc, outproc - in/out XDR procedures
100 * nettype - nettype
101 */
102 int
rpc_reg(rpcprog_t prognum,rpcvers_t versnum,rpcproc_t procnum,char * (* progname)(char *),xdrproc_t inproc,xdrproc_t outproc,char * nettype)103 rpc_reg(rpcprog_t prognum, rpcvers_t versnum, rpcproc_t procnum,
104 char *(*progname)(char *), xdrproc_t inproc, xdrproc_t outproc,
105 char *nettype)
106 {
107 struct netconfig *nconf;
108 int done = FALSE;
109 void *handle;
110
111
112 if (procnum == NULLPROC) {
113 warnx("%s can't reassign procedure number %u", rpc_reg_msg,
114 NULLPROC);
115 return (-1);
116 }
117
118 if (nettype == NULL)
119 nettype = "netpath"; /* The default behavior */
120 if ((handle = __rpc_setconf(nettype)) == NULL) {
121 warnx(rpc_reg_err, rpc_reg_msg, __reg_err1);
122 return (-1);
123 }
124 /* VARIABLES PROTECTED BY proglst_lock: proglst */
125 mutex_lock(&proglst_lock);
126 while ((nconf = __rpc_getconf(handle)) != NULL) {
127 struct proglst *pl;
128 SVCXPRT *svcxprt;
129 int madenow;
130 u_int recvsz;
131 char *xdrbuf;
132 char *netid;
133
134 madenow = FALSE;
135 svcxprt = NULL;
136 recvsz = 0;
137 xdrbuf = netid = NULL;
138 for (pl = proglst; pl; pl = pl->p_nxt) {
139 if (strcmp(pl->p_netid, nconf->nc_netid) == 0) {
140 svcxprt = pl->p_transp;
141 xdrbuf = pl->p_xdrbuf;
142 recvsz = pl->p_recvsz;
143 netid = pl->p_netid;
144 break;
145 }
146 }
147
148 if (svcxprt == NULL) {
149 struct __rpc_sockinfo si;
150
151 svcxprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
152 if (svcxprt == NULL)
153 continue;
154 if (!__rpc_fd2sockinfo(svcxprt->xp_fd, &si)) {
155 warnx(rpc_reg_err, rpc_reg_msg, __reg_err2);
156 SVC_DESTROY(svcxprt);
157 continue;
158 }
159 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, 0);
160 if (recvsz == 0) {
161 warnx(rpc_reg_err, rpc_reg_msg, __reg_err3);
162 SVC_DESTROY(svcxprt);
163 continue;
164 }
165 if (((xdrbuf = malloc((unsigned)recvsz)) == NULL) ||
166 ((netid = strdup(nconf->nc_netid)) == NULL)) {
167 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str);
168 free(xdrbuf);
169 free(netid);
170 SVC_DESTROY(svcxprt);
171 break;
172 }
173 madenow = TRUE;
174 }
175 /*
176 * Check if this (program, version, netid) had already been
177 * registered. The check may save a few RPC calls to rpcbind
178 */
179 for (pl = proglst; pl; pl = pl->p_nxt)
180 if ((pl->p_prognum == prognum) &&
181 (pl->p_versnum == versnum) &&
182 (strcmp(pl->p_netid, netid) == 0))
183 break;
184 if (pl == NULL) { /* Not yet */
185 (void) rpcb_unset(prognum, versnum, nconf);
186 } else {
187 /* so that svc_reg does not call rpcb_set() */
188 nconf = NULL;
189 }
190
191 if (!svc_reg(svcxprt, prognum, versnum, universal, nconf)) {
192 warnx("%s couldn't register prog %u vers %u for %s",
193 rpc_reg_msg, (unsigned)prognum,
194 (unsigned)versnum, netid);
195 if (madenow) {
196 SVC_DESTROY(svcxprt);
197 free(xdrbuf);
198 free(netid);
199 }
200 continue;
201 }
202
203 pl = malloc(sizeof (struct proglst));
204 if (pl == NULL) {
205 warnx(rpc_reg_err, rpc_reg_msg, __no_mem_str);
206 if (madenow) {
207 SVC_DESTROY(svcxprt);
208 free(xdrbuf);
209 free(netid);
210 }
211 break;
212 }
213 pl->p_progname = progname;
214 pl->p_prognum = prognum;
215 pl->p_versnum = versnum;
216 pl->p_procnum = procnum;
217 pl->p_inproc = inproc;
218 pl->p_outproc = outproc;
219 pl->p_transp = svcxprt;
220 pl->p_xdrbuf = xdrbuf;
221 pl->p_recvsz = recvsz;
222 pl->p_netid = netid;
223 pl->p_nxt = proglst;
224 proglst = pl;
225 done = TRUE;
226 }
227 __rpc_endconf(handle);
228 mutex_unlock(&proglst_lock);
229
230 if (done == FALSE) {
231 warnx("%s can't find suitable transport for %s",
232 rpc_reg_msg, nettype);
233 return (-1);
234 }
235 return (0);
236 }
237
238 /*
239 * The universal handler for the services registered using registerrpc.
240 * It handles both the connectionless and the connection oriented cases.
241 */
242
243 static void
universal(struct svc_req * rqstp,SVCXPRT * transp)244 universal(struct svc_req *rqstp, SVCXPRT *transp)
245 {
246 rpcprog_t prog;
247 rpcvers_t vers;
248 rpcproc_t proc;
249 char *outdata;
250 char *xdrbuf;
251 struct proglst *pl;
252
253 /*
254 * enforce "procnum 0 is echo" convention
255 */
256 if (rqstp->rq_proc == NULLPROC) {
257 if (svc_sendreply(transp, (xdrproc_t) xdr_void, NULL) ==
258 FALSE) {
259 warnx("svc_sendreply failed");
260 }
261 return;
262 }
263 prog = rqstp->rq_prog;
264 vers = rqstp->rq_vers;
265 proc = rqstp->rq_proc;
266 mutex_lock(&proglst_lock);
267 for (pl = proglst; pl; pl = pl->p_nxt)
268 if (pl->p_prognum == prog && pl->p_procnum == proc &&
269 pl->p_versnum == vers &&
270 (strcmp(pl->p_netid, transp->xp_netid) == 0)) {
271 /* decode arguments into a CLEAN buffer */
272 xdrbuf = pl->p_xdrbuf;
273 /* Zero the arguments: reqd ! */
274 (void) memset(xdrbuf, 0, (size_t)pl->p_recvsz);
275 /*
276 * Assuming that sizeof (xdrbuf) would be enough
277 * for the arguments; if not then the program
278 * may bomb. BEWARE!
279 */
280 if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) {
281 svcerr_decode(transp);
282 mutex_unlock(&proglst_lock);
283 return;
284 }
285 outdata = (*(pl->p_progname))(xdrbuf);
286 if (outdata == NULL &&
287 pl->p_outproc != (xdrproc_t) xdr_void){
288 /* there was an error */
289 mutex_unlock(&proglst_lock);
290 return;
291 }
292 if (!svc_sendreply(transp, pl->p_outproc, outdata)) {
293 warnx(
294 "rpc: rpc_reg trouble replying to prog %u vers %u",
295 (unsigned)prog, (unsigned)vers);
296 mutex_unlock(&proglst_lock);
297 return;
298 }
299 /* free the decoded arguments */
300 (void)svc_freeargs(transp, pl->p_inproc, xdrbuf);
301 mutex_unlock(&proglst_lock);
302 return;
303 }
304 mutex_unlock(&proglst_lock);
305 /* This should never happen */
306 warnx("rpc: rpc_reg: never registered prog %u vers %u",
307 (unsigned)prog, (unsigned)vers);
308 return;
309 }
310