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