xref: /freebsd/sys/rpc/svc_generic.c (revision 7fdf597e96a02165cfe22ff357b857d5fa15ed8a)
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 "opt_inet6.h"
43 
44 #include <sys/param.h>
45 #include <sys/lock.h>
46 #include <sys/kernel.h>
47 #include <sys/malloc.h>
48 #include <sys/mutex.h>
49 #include <sys/protosw.h>
50 #include <sys/queue.h>
51 #include <sys/socket.h>
52 #include <sys/socketvar.h>
53 #include <sys/systm.h>
54 #include <sys/sx.h>
55 #include <sys/ucred.h>
56 
57 #include <net/vnet.h>
58 
59 #include <rpc/rpc.h>
60 #include <rpc/rpcb_clnt.h>
61 #include <rpc/nettype.h>
62 
63 #include <rpc/rpc_com.h>
64 
65 extern int __svc_vc_setflag(SVCXPRT *, int);
66 
67 /*
68  * The highest level interface for server creation.
69  * It tries for all the nettokens in that particular class of token
70  * and returns the number of handles it can create and/or find.
71  *
72  * It creates a link list of all the handles it could create.
73  * If svc_create() is called multiple times, it uses the handle
74  * created earlier instead of creating a new handle every time.
75  */
76 int
77 svc_create(
78 	SVCPOOL *pool,
79 	void (*dispatch)(struct svc_req *, SVCXPRT *),
80 	rpcprog_t prognum,		/* Program number */
81 	rpcvers_t versnum,		/* Version number */
82 	const char *nettype)		/* Networktype token */
83 {
84 	int g, num = 0;
85 	SVCGROUP *grp;
86 	SVCXPRT *xprt;
87 	struct netconfig *nconf;
88 	void *handle;
89 
90 	if ((handle = __rpc_setconf(nettype)) == NULL) {
91 		printf("svc_create: unknown protocol");
92 		return (0);
93 	}
94 	while ((nconf = __rpc_getconf(handle)) != NULL) {
95 		for (g = 0; g < SVC_MAXGROUPS; g++) {
96 			grp = &pool->sp_groups[g];
97 			mtx_lock(&grp->sg_lock);
98 			TAILQ_FOREACH(xprt, &grp->sg_xlist, xp_link) {
99 				if (strcmp(xprt->xp_netid, nconf->nc_netid))
100 					continue;
101 				/* Found an old one, use it */
102 				mtx_unlock(&grp->sg_lock);
103 				(void) rpcb_unset(prognum, versnum, nconf);
104 				if (svc_reg(xprt, prognum, versnum,
105 					dispatch, nconf) == FALSE) {
106 					printf(
107 		"svc_create: could not register prog %u vers %u on %s\n",
108 					(unsigned)prognum, (unsigned)versnum,
109 					 nconf->nc_netid);
110 					mtx_lock(&grp->sg_lock);
111 				} else {
112 					num++;
113 					mtx_lock(&grp->sg_lock);
114 					break;
115 				}
116 			}
117 			mtx_unlock(&grp->sg_lock);
118 		}
119 		if (xprt == NULL) {
120 			/* It was not found. Now create a new one */
121 			xprt = svc_tp_create(pool, dispatch, prognum, versnum,
122 			    NULL, nconf);
123 			if (xprt) {
124 				num++;
125 				SVC_RELEASE(xprt);
126 			}
127 		}
128 	}
129 	__rpc_endconf(handle);
130 	/*
131 	 * In case of num == 0; the error messages are generated by the
132 	 * underlying layers; and hence not needed here.
133 	 */
134 	return (num);
135 }
136 
137 /*
138  * The high level interface to svc_tli_create().
139  * It tries to create a server for "nconf" and registers the service
140  * with the rpcbind. It calls svc_tli_create();
141  */
142 SVCXPRT *
143 svc_tp_create(
144 	SVCPOOL *pool,
145 	void (*dispatch)(struct svc_req *, SVCXPRT *),
146 	rpcprog_t prognum,		/* Program number */
147 	rpcvers_t versnum,		/* Version number */
148 	const char *uaddr,		/* Address (or null for default) */
149 	const struct netconfig *nconf) /* Netconfig structure for the network */
150 {
151 	struct netconfig nconfcopy;
152 	struct netbuf *taddr;
153 	struct t_bind bind;
154 	SVCXPRT *xprt;
155 
156 	if (nconf == NULL) {
157 		printf(
158 	"svc_tp_create: invalid netconfig structure for prog %u vers %u\n",
159 				(unsigned)prognum, (unsigned)versnum);
160 		return (NULL);
161 	}
162 	if (uaddr) {
163 		taddr = uaddr2taddr(nconf, uaddr);
164 		bind.addr = *taddr;
165 		free(taddr, M_RPC);
166 		bind.qlen = -1;
167 		xprt = svc_tli_create(pool, NULL, nconf, &bind, 0, 0);
168 		free(bind.addr.buf, M_RPC);
169 	} else {
170 		xprt = svc_tli_create(pool, NULL, nconf, NULL, 0, 0);
171 	}
172 	if (xprt == NULL) {
173 		return (NULL);
174 	}
175 	/*LINTED const castaway*/
176 	nconfcopy = *nconf;
177 	(void) rpcb_unset(prognum, versnum, &nconfcopy);
178 	if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
179 		printf(
180 		"svc_tp_create: Could not register prog %u vers %u on %s\n",
181 				(unsigned)prognum, (unsigned)versnum,
182 				nconf->nc_netid);
183 		xprt_unregister(xprt);
184 		SVC_RELEASE(xprt);
185 		return (NULL);
186 	}
187 	return (xprt);
188 }
189 
190 /*
191  * If so is NULL, then it opens a socket for the given transport
192  * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
193  * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
194  * NULL bindadr and Connection oriented transports, the value of qlen
195  * is set to 8.
196  *
197  * If sendsz or recvsz are zero, their default values are chosen.
198  */
199 SVCXPRT *
200 svc_tli_create(
201 	SVCPOOL *pool,
202 	struct socket *so,		/* Connection end point */
203 	const struct netconfig *nconf,	/* Netconfig struct for nettoken */
204 	const struct t_bind *bindaddr,	/* Local bind address */
205 	size_t sendsz,			/* Max sendsize */
206 	size_t recvsz)			/* Max recvsize */
207 {
208 	SVCXPRT *xprt = NULL;		/* service handle */
209 	bool_t madeso = FALSE;		/* whether so opened here  */
210 	struct __rpc_sockinfo si;
211 	struct sockaddr_storage ss;
212 
213 	if (!so) {
214 		if (nconf == NULL) {
215 			printf("svc_tli_create: invalid netconfig\n");
216 			return (NULL);
217 		}
218 		so = __rpc_nconf2socket(nconf);
219 		if (!so) {
220 			printf(
221 			    "svc_tli_create: could not open connection for %s\n",
222 					nconf->nc_netid);
223 			return (NULL);
224 		}
225 		__rpc_nconf2sockinfo(nconf, &si);
226 		madeso = TRUE;
227 	} else {
228 		/*
229 		 * It is an open socket. Get the transport info.
230 		 */
231 		if (!__rpc_socket2sockinfo(so, &si)) {
232 			printf(
233 		"svc_tli_create: could not get transport information\n");
234 			return (NULL);
235 		}
236 	}
237 
238 	/*
239 	 * If the socket is unbound, try to bind it.
240 	 */
241 	if (madeso || !__rpc_sockisbound(so)) {
242 		if (bindaddr == NULL) {
243 			if (bindresvport(so, NULL)) {
244 				memset(&ss, 0, sizeof ss);
245 				ss.ss_family = si.si_af;
246 				ss.ss_len = si.si_alen;
247 				if (sobind(so, (struct sockaddr *)&ss,
248 					curthread)) {
249 					printf(
250 			"svc_tli_create: could not bind to anonymous port\n");
251 					goto freedata;
252 				}
253 			}
254 			solisten(so, -1, curthread);
255 		} else {
256 			if (bindresvport(so,
257 				(struct sockaddr *)bindaddr->addr.buf)) {
258 				printf(
259 		"svc_tli_create: could not bind to requested address\n");
260 				goto freedata;
261 			}
262 			solisten(so, (int)bindaddr->qlen, curthread);
263 		}
264 
265 	}
266 	/*
267 	 * call transport specific function.
268 	 */
269 	switch (si.si_socktype) {
270 		case SOCK_STREAM:
271 #if 0
272 			slen = sizeof ss;
273 			if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
274 			    == 0) {
275 				/* accepted socket */
276 				xprt = svc_fd_create(fd, sendsz, recvsz);
277 			} else
278 #endif
279 				xprt = svc_vc_create(pool, so, sendsz, recvsz);
280 			if (!nconf || !xprt)
281 				break;
282 #if 0
283 			/* XXX fvdl */
284 			if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
285 			    strcmp(nconf->nc_protofmly, "inet6") == 0)
286 				(void) __svc_vc_setflag(xprt, TRUE);
287 #endif
288 			break;
289 		case SOCK_DGRAM:
290 			xprt = svc_dg_create(pool, so, sendsz, recvsz);
291 			break;
292 		default:
293 			printf("svc_tli_create: bad service type");
294 			goto freedata;
295 	}
296 
297 	if (xprt == NULL)
298 		/*
299 		 * The error messages here are spitted out by the lower layers:
300 		 * svc_vc_create(), svc_fd_create() and svc_dg_create().
301 		 */
302 		goto freedata;
303 
304 	/* Fill in type of service */
305 	xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
306 
307 	if (nconf) {
308 		xprt->xp_netid = strdup(nconf->nc_netid, M_RPC);
309 	}
310 	return (xprt);
311 
312 freedata:
313 	if (madeso)
314 		(void)soclose(so);
315 	if (xprt) {
316 		if (!madeso) /* so that svc_destroy doesnt close fd */
317 			xprt->xp_socket = NULL;
318 		xprt_unregister(xprt);
319 	}
320 	return (NULL);
321 }
322