1 /* $NetBSD: svc_generic.c,v 1.18 2024/01/23 17:24:38 christos Exp $ */
2
3 /*
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, 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
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
36 */
37
38 /* #ident "@(#)svc_generic.c 1.19 94/04/24 SMI" */
39
40 #include <sys/cdefs.h>
41 #if defined(LIBC_SCCS) && !defined(lint)
42 #if 0
43 static char sccsid[] = "@(#)svc_generic.c 1.21 89/02/28 Copyr 1988 Sun Micro";
44 #else
45 __RCSID("$NetBSD: svc_generic.c,v 1.18 2024/01/23 17:24:38 christos Exp $");
46 #endif
47 #endif
48
49 /*
50 * svc_generic.c, Server side for RPC.
51 *
52 */
53
54 #include "namespace.h"
55 #include "reentrant.h"
56 #include <sys/types.h>
57 #include <sys/socket.h>
58 #include <netinet/in.h>
59 #include <rpc/rpc.h>
60 #include <rpc/nettype.h>
61 #include <stdio.h>
62 #include <errno.h>
63 #include <stdlib.h>
64 #include <string.h>
65 #include <unistd.h>
66 #include <err.h>
67
68 #include "svc_fdset.h"
69 #include "rpc_internal.h"
70
71 #ifdef __weak_alias
72 __weak_alias(svc_create,_svc_create)
73 __weak_alias(svc_tp_create,_svc_tp_create)
74 __weak_alias(svc_tli_create,_svc_tli_create)
75 #endif
76
77 extern int __svc_vc_setflag(SVCXPRT *, int);
78
79 /*
80 * The highest level interface for server creation.
81 * It tries for all the nettokens in that particular class of token
82 * and returns the number of handles it can create and/or find.
83 *
84 * It creates a link list of all the handles it could create.
85 * If svc_create() is called multiple times, it uses the handle
86 * created earlier instead of creating a new handle every time.
87 */
88 int
svc_create(void (* dispatch)(struct svc_req *,SVCXPRT *),rpcprog_t prognum,rpcvers_t versnum,const char * nettype)89 svc_create(
90 void (*dispatch)(struct svc_req *, SVCXPRT *),
91 rpcprog_t prognum, /* Program number */
92 rpcvers_t versnum, /* Version number */
93 const char *nettype) /* Networktype token */
94 {
95 struct xlist {
96 SVCXPRT *xprt; /* Server handle */
97 struct xlist *next; /* Next item */
98 } *l;
99 static struct xlist *xprtlist; /* A link list of all the handles */
100 int num = 0;
101 SVCXPRT *xprt;
102 struct netconfig *nconf;
103 void *handle;
104
105 /* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */
106
107 if ((handle = __rpc_setconf(nettype)) == NULL) {
108 warnx("%s: unknown protocol %s", __func__, nettype);
109 return (0);
110 }
111 while ((nconf = __rpc_getconf(handle)) != NULL) {
112 mutex_lock(&xprtlist_lock);
113 for (l = xprtlist; l; l = l->next) {
114 if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
115 /* Found an old one, use it */
116 (void) rpcb_unset(prognum, versnum, nconf);
117 if (svc_reg(l->xprt, prognum, versnum,
118 dispatch, nconf) == FALSE)
119 warnx("%s: could not register prog %u "
120 "vers %u on %s", __func__,
121 (unsigned)prognum,
122 (unsigned)versnum, nconf->nc_netid);
123 else
124 num++;
125 break;
126 }
127 }
128 if (l == NULL) {
129 /* It was not found. Now create a new one */
130 xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
131 if (xprt) {
132 l = malloc(sizeof(*l));
133 if (l == NULL) {
134 warn("%s: out of memory", __func__);
135 mutex_unlock(&xprtlist_lock);
136 return (0);
137 }
138 l->xprt = xprt;
139 l->next = xprtlist;
140 xprtlist = l;
141 num++;
142 }
143 }
144 mutex_unlock(&xprtlist_lock);
145 }
146 __rpc_endconf(handle);
147 /*
148 * In case of num == 0; the error messages are generated by the
149 * underlying layers; and hence not needed here.
150 */
151 return (num);
152 }
153
154 /*
155 * The high level interface to svc_tli_create().
156 * It tries to create a server for "nconf" and registers the service
157 * with the rpcbind. It calls svc_tli_create();
158 */
159 SVCXPRT *
svc_tp_create(void (* dispatch)(struct svc_req *,SVCXPRT *),rpcprog_t prognum,rpcvers_t versnum,const struct netconfig * nconf)160 svc_tp_create(
161 void (*dispatch)(struct svc_req *, SVCXPRT *),
162 rpcprog_t prognum, /* Program number */
163 rpcvers_t versnum, /* Version number */
164 const struct netconfig *nconf) /* Netconfig structure for the network */
165 {
166 SVCXPRT *xprt;
167
168 if (nconf == NULL) {
169 warnx("%s: invalid netconfig structure for prog %u vers %u",
170 __func__, (unsigned)prognum, (unsigned)versnum);
171 return (NULL);
172 }
173 xprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
174 if (xprt == NULL) {
175 return (NULL);
176 }
177 (void) rpcb_unset(prognum, versnum, __UNCONST(nconf));
178 if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
179 warnx("%s: Could not register prog %u vers %u on %s",
180 __func__, (unsigned)prognum, (unsigned)versnum,
181 nconf->nc_netid);
182 SVC_DESTROY(xprt);
183 return (NULL);
184 }
185 return (xprt);
186 }
187
188 /*
189 * If fd is RPC_ANYFD, then it opens a fd for the given transport
190 * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
191 * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
192 * NULL bindadr and Connection oriented transports, the value of qlen
193 * is set to 8.
194 *
195 * If sendsz or recvsz are zero, their default values are chosen.
196 */
197 SVCXPRT *
svc_tli_create(int fd,const struct netconfig * nconf,const struct t_bind * bindaddr,u_int sendsz,u_int recvsz)198 svc_tli_create(
199 int fd, /* Connection end point */
200 const struct netconfig *nconf, /* Netconfig struct for nettoken */
201 const struct t_bind *bindaddr, /* Local bind address */
202 u_int sendsz, /* Max sendsize */
203 u_int recvsz) /* Max recvsize */
204 {
205 SVCXPRT *xprt = NULL; /* service handle */
206 bool_t madefd = FALSE; /* whether fd opened here */
207 struct __rpc_sockinfo si;
208 struct sockaddr_storage ss;
209 socklen_t slen;
210
211 if (fd == RPC_ANYFD) {
212 if (nconf == NULL) {
213 warnx("%s: invalid netconfig", __func__);
214 return (NULL);
215 }
216 fd = __rpc_nconf2fd(nconf);
217 if (fd == -1) {
218 warnx("%s: could not open connection for %s", __func__,
219 nconf->nc_netid);
220 return (NULL);
221 }
222 __rpc_nconf2sockinfo(nconf, &si);
223 madefd = TRUE;
224 } else {
225 /*
226 * It is an open descriptor. Get the transport info.
227 */
228 if (!__rpc_fd2sockinfo(fd, &si)) {
229 warnx("%s: could not get transport information",
230 __func__);
231 return (NULL);
232 }
233 }
234
235 /*
236 * If the fd is unbound, try to bind it.
237 */
238 if (madefd || !__rpc_sockisbound(fd)) {
239 if (bindaddr == NULL) {
240 if (bindresvport(fd, NULL) < 0) {
241 memset(&ss, 0, sizeof ss);
242 ss.ss_family = si.si_af;
243 ss.ss_len = si.si_alen;
244 if (bind(fd, (struct sockaddr *)(void *)&ss,
245 (socklen_t)si.si_alen) < 0) {
246 warn( "%s: could not bind to anonymous "
247 "port", __func__);
248 goto freedata;
249 }
250 }
251 if (si.si_socktype != SOCK_DGRAM &&
252 listen(fd, SOMAXCONN) == -1) {
253 warnx("%s: could not listen at anonymous port",
254 __func__);
255 goto freedata;
256 }
257 } else {
258 if (bind(fd,
259 (struct sockaddr *)bindaddr->addr.buf,
260 (socklen_t)si.si_alen) < 0) {
261 warnx("%s: could not bind to requested address",
262 __func__);
263 goto freedata;
264 }
265 if (si.si_socktype != SOCK_DGRAM &&
266 listen(fd, (int)bindaddr->qlen) == -1) {
267 warnx("%s: could not listen at requested "
268 "address", __func__);
269 goto freedata;
270 }
271 }
272 }
273 /*
274 * call transport specific function.
275 */
276 switch (si.si_socktype) {
277 case SOCK_STREAM:
278 slen = sizeof ss;
279 if (getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
280 == 0) {
281 /* accepted socket */
282 xprt = svc_fd_create(fd, sendsz, recvsz);
283 } else
284 xprt = svc_vc_create(fd, sendsz, recvsz);
285 if (!nconf || !xprt)
286 break;
287 #if 0
288 /* XXX fvdl */
289 if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
290 strcmp(nconf->nc_protofmly, "inet6") == 0)
291 (void) __svc_vc_setflag(xprt, TRUE);
292 #endif
293 break;
294 case SOCK_DGRAM:
295 xprt = svc_dg_create(fd, sendsz, recvsz);
296 break;
297 default:
298 warnx("%s: bad service type %u", __func__, si.si_socktype);
299 goto freedata;
300 }
301
302 if (xprt == NULL)
303 /*
304 * The error messages here are spitted out by the lower layers:
305 * svc_vc_create(), svc_fd_create() and svc_dg_create().
306 */
307 goto freedata;
308
309 /* Fill in type of service */
310 xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
311
312 if (nconf) {
313 xprt->xp_netid = strdup(nconf->nc_netid);
314 xprt->xp_tp = strdup(nconf->nc_device);
315 if (xprt->xp_netid == NULL || xprt->xp_tp == NULL) {
316 svc_destroy(xprt);
317 return NULL;
318 }
319 }
320 return (xprt);
321
322 freedata:
323 if (madefd)
324 (void) close(fd);
325 return (NULL);
326 }
327