1 /* $NetBSD: svc_generic.c,v 1.3 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 /*
34 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
35 */
36
37 /*
38 * svc_generic.c, Server side for RPC.
39 *
40 */
41
42 #include "namespace.h"
43 #include "reentrant.h"
44 #include <sys/types.h>
45 #include <sys/socket.h>
46 #include <netinet/in.h>
47 #include <rpc/rpc.h>
48 #include <rpc/nettype.h>
49 #include <stdio.h>
50 #include <errno.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54 #include <err.h>
55 #include "un-namespace.h"
56
57 #include "rpc_com.h"
58 #include "mt_misc.h"
59
60 extern int __svc_vc_setflag(SVCXPRT *, int);
61
62 /*
63 * The highest level interface for server creation.
64 * It tries for all the nettokens in that particular class of token
65 * and returns the number of handles it can create and/or find.
66 *
67 * It creates a link list of all the handles it could create.
68 * If svc_create() is called multiple times, it uses the handle
69 * created earlier instead of creating a new handle every time.
70 *
71 * prognum - Program number
72 * versnum - Version number
73 * nettype - Networktype token
74 */
75 int
svc_create(void (* dispatch)(struct svc_req *,SVCXPRT *),rpcprog_t prognum,rpcvers_t versnum,const char * nettype)76 svc_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
77 rpcprog_t prognum, rpcvers_t versnum, const char *nettype)
78 {
79 struct xlist {
80 SVCXPRT *xprt; /* Server handle */
81 struct xlist *next; /* Next item */
82 } *l;
83 static struct xlist *xprtlist; /* A link list of all the handles */
84 int num = 0;
85 SVCXPRT *xprt;
86 struct netconfig *nconf;
87 void *handle;
88
89 /* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */
90
91 if ((handle = __rpc_setconf(nettype)) == NULL) {
92 warnx("svc_create: unknown protocol");
93 return (0);
94 }
95 while ((nconf = __rpc_getconf(handle)) != NULL) {
96 mutex_lock(&xprtlist_lock);
97 for (l = xprtlist; l; l = l->next) {
98 if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
99 /* Found an old one, use it */
100 (void) rpcb_unset(prognum, versnum, nconf);
101 if (svc_reg(l->xprt, prognum, versnum,
102 dispatch, nconf) == FALSE)
103 warnx(
104 "svc_create: could not register prog %u vers %u on %s",
105 (unsigned)prognum, (unsigned)versnum,
106 nconf->nc_netid);
107 else
108 num++;
109 break;
110 }
111 }
112 if (l == NULL) {
113 /* It was not found. Now create a new one */
114 xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
115 if (xprt) {
116 l = (struct xlist *)malloc(sizeof (*l));
117 if (l == NULL) {
118 warnx("svc_create: no memory");
119 mutex_unlock(&xprtlist_lock);
120 num = 0;
121 goto done;
122 }
123 l->xprt = xprt;
124 l->next = xprtlist;
125 xprtlist = l;
126 num++;
127 }
128 }
129 mutex_unlock(&xprtlist_lock);
130 }
131 done:
132 __rpc_endconf(handle);
133 /*
134 * In case of num == 0; the error messages are generated by the
135 * underlying layers; and hence not needed here.
136 */
137 return (num);
138 }
139
140 /*
141 * The high level interface to svc_tli_create().
142 * It tries to create a server for "nconf" and registers the service
143 * with the rpcbind. It calls svc_tli_create();
144 *
145 * prognum - Program number
146 * versnum - Version number
147 * ncofn - Netconfig structure for the network
148 */
149 SVCXPRT *
svc_tp_create(void (* dispatch)(struct svc_req *,SVCXPRT *),rpcprog_t prognum,rpcvers_t versnum,const struct netconfig * nconf)150 svc_tp_create(void (*dispatch)(struct svc_req *, SVCXPRT *),
151 rpcprog_t prognum, rpcvers_t versnum, const struct netconfig *nconf)
152 {
153 SVCXPRT *xprt;
154
155 if (nconf == NULL) {
156 warnx(
157 "svc_tp_create: invalid netconfig structure for prog %u vers %u",
158 (unsigned)prognum, (unsigned)versnum);
159 return (NULL);
160 }
161 xprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
162 if (xprt == NULL) {
163 return (NULL);
164 }
165 /*LINTED const castaway*/
166 (void) rpcb_unset(prognum, versnum, (struct netconfig *) nconf);
167 if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
168 warnx(
169 "svc_tp_create: Could not register prog %u vers %u on %s",
170 (unsigned)prognum, (unsigned)versnum,
171 nconf->nc_netid);
172 SVC_DESTROY(xprt);
173 return (NULL);
174 }
175 return (xprt);
176 }
177
178 /*
179 * If fd is RPC_ANYFD, then it opens a fd for the given transport
180 * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
181 * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
182 * NULL bindadr and Connection oriented transports, the value of qlen
183 * is set to 8.
184 *
185 * If sendsz or recvsz are zero, their default values are chosen.
186 *
187 * fd - Connection end point
188 * nconf - Netconfig struct for nettoken
189 * bindaddr - Local bind address
190 * sendsz - Max sendsize
191 * recvxz - Max recvsize
192 */
193 SVCXPRT *
svc_tli_create(int fd,const struct netconfig * nconf,const struct t_bind * bindaddr,u_int sendsz,u_int recvsz)194 svc_tli_create(int fd, const struct netconfig *nconf,
195 const struct t_bind *bindaddr, u_int sendsz, u_int recvsz)
196 {
197 SVCXPRT *xprt = NULL; /* service handle */
198 bool_t madefd = FALSE; /* whether fd opened here */
199 struct __rpc_sockinfo si;
200 struct sockaddr_storage ss;
201 socklen_t slen;
202
203 if (fd == RPC_ANYFD) {
204 if (nconf == NULL) {
205 warnx("svc_tli_create: invalid netconfig");
206 return (NULL);
207 }
208 fd = __rpc_nconf2fd(nconf);
209 if (fd == -1) {
210 warnx(
211 "svc_tli_create: could not open connection for %s",
212 nconf->nc_netid);
213 return (NULL);
214 }
215 __rpc_nconf2sockinfo(nconf, &si);
216 madefd = TRUE;
217 } else {
218 /*
219 * It is an open descriptor. Get the transport info.
220 */
221 if (!__rpc_fd2sockinfo(fd, &si)) {
222 warnx(
223 "svc_tli_create: could not get transport information");
224 return (NULL);
225 }
226 }
227
228 /*
229 * If the fd is unbound, try to bind it.
230 */
231 if (madefd || !__rpc_sockisbound(fd)) {
232 if (bindaddr == NULL) {
233 if (bindresvport(fd, NULL) < 0) {
234 memset(&ss, 0, sizeof ss);
235 ss.ss_family = si.si_af;
236 ss.ss_len = si.si_alen;
237 if (_bind(fd, (struct sockaddr *)(void *)&ss,
238 (socklen_t)si.si_alen) < 0) {
239 warnx(
240 "svc_tli_create: could not bind to anonymous port");
241 goto freedata;
242 }
243 }
244 _listen(fd, SOMAXCONN);
245 } else {
246 if (_bind(fd,
247 (struct sockaddr *)bindaddr->addr.buf,
248 (socklen_t)si.si_alen) < 0) {
249 warnx(
250 "svc_tli_create: could not bind to requested address");
251 goto freedata;
252 }
253 _listen(fd, (int)bindaddr->qlen);
254 }
255
256 }
257 /*
258 * call transport specific function.
259 */
260 switch (si.si_socktype) {
261 case SOCK_STREAM:
262 slen = sizeof ss;
263 if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
264 == 0) {
265 /* accepted socket */
266 xprt = svc_fd_create(fd, sendsz, recvsz);
267 } else
268 xprt = svc_vc_create(fd, sendsz, recvsz);
269 if (!nconf || !xprt)
270 break;
271 #if 0
272 /* XXX fvdl */
273 if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
274 strcmp(nconf->nc_protofmly, "inet6") == 0)
275 (void) __svc_vc_setflag(xprt, TRUE);
276 #endif
277 break;
278 case SOCK_DGRAM:
279 xprt = svc_dg_create(fd, sendsz, recvsz);
280 break;
281 default:
282 warnx("svc_tli_create: bad service type");
283 goto freedata;
284 }
285
286 if (xprt == NULL)
287 /*
288 * The error messages here are spitted out by the lower layers:
289 * svc_vc_create(), svc_fd_create() and svc_dg_create().
290 */
291 goto freedata;
292
293 /* Fill in type of service */
294 xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
295
296 if (nconf) {
297 xprt->xp_netid = strdup(nconf->nc_netid);
298 xprt->xp_tp = strdup(nconf->nc_device);
299 }
300 return (xprt);
301
302 freedata:
303 if (madefd)
304 (void)_close(fd);
305 if (xprt) {
306 if (!madefd) /* so that svc_destroy doesnt close fd */
307 xprt->xp_fd = RPC_ANYFD;
308 SVC_DESTROY(xprt);
309 }
310 return (NULL);
311 }
312