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#if defined(LIBC_SCCS) && !defined(lint)
38#ident	"@(#)svc_generic.c	1.19	94/04/24 SMI"
39static char sccsid[] = "@(#)svc_generic.c 1.21 89/02/28 Copyr 1988 Sun Micro";
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD$");
43
44/*
45 * svc_generic.c, Server side for RPC.
46 *
47 */
48
49#include "opt_inet6.h"
50
51#include <sys/param.h>
52#include <sys/lock.h>
53#include <sys/kernel.h>
54#include <sys/malloc.h>
55#include <sys/mutex.h>
56#include <sys/protosw.h>
57#include <sys/queue.h>
58#include <sys/socket.h>
59#include <sys/socketvar.h>
60#include <sys/systm.h>
61#include <sys/sx.h>
62#include <sys/ucred.h>
63
64#include <net/vnet.h>
65
66#include <rpc/rpc.h>
67#include <rpc/rpcb_clnt.h>
68#include <rpc/nettype.h>
69
70#include <rpc/rpc_com.h>
71
72extern int __svc_vc_setflag(SVCXPRT *, int);
73
74/*
75 * The highest level interface for server creation.
76 * It tries for all the nettokens in that particular class of token
77 * and returns the number of handles it can create and/or find.
78 *
79 * It creates a link list of all the handles it could create.
80 * If svc_create() is called multiple times, it uses the handle
81 * created earlier instead of creating a new handle every time.
82 */
83int
84svc_create(
85	SVCPOOL *pool,
86	void (*dispatch)(struct svc_req *, SVCXPRT *),
87	rpcprog_t prognum,		/* Program number */
88	rpcvers_t versnum,		/* Version number */
89	const char *nettype)		/* Networktype token */
90{
91	int g, num = 0;
92	SVCGROUP *grp;
93	SVCXPRT *xprt;
94	struct netconfig *nconf;
95	void *handle;
96
97	if ((handle = __rpc_setconf(nettype)) == NULL) {
98		printf("svc_create: unknown protocol");
99		return (0);
100	}
101	while ((nconf = __rpc_getconf(handle)) != NULL) {
102		for (g = 0; g < SVC_MAXGROUPS; g++) {
103			grp = &pool->sp_groups[g];
104			mtx_lock(&grp->sg_lock);
105			TAILQ_FOREACH(xprt, &grp->sg_xlist, xp_link) {
106				if (strcmp(xprt->xp_netid, nconf->nc_netid))
107					continue;
108				/* Found an old one, use it */
109				mtx_unlock(&grp->sg_lock);
110				(void) rpcb_unset(prognum, versnum, nconf);
111				if (svc_reg(xprt, prognum, versnum,
112					dispatch, nconf) == FALSE) {
113					printf(
114		"svc_create: could not register prog %u vers %u on %s\n",
115					(unsigned)prognum, (unsigned)versnum,
116					 nconf->nc_netid);
117					mtx_lock(&grp->sg_lock);
118				} else {
119					num++;
120					mtx_lock(&grp->sg_lock);
121					break;
122				}
123			}
124			mtx_unlock(&grp->sg_lock);
125		}
126		if (xprt == NULL) {
127			/* It was not found. Now create a new one */
128			xprt = svc_tp_create(pool, dispatch, prognum, versnum,
129			    NULL, nconf);
130			if (xprt) {
131				num++;
132				SVC_RELEASE(xprt);
133			}
134		}
135	}
136	__rpc_endconf(handle);
137	/*
138	 * In case of num == 0; the error messages are generated by the
139	 * underlying layers; and hence not needed here.
140	 */
141	return (num);
142}
143
144/*
145 * The high level interface to svc_tli_create().
146 * It tries to create a server for "nconf" and registers the service
147 * with the rpcbind. It calls svc_tli_create();
148 */
149SVCXPRT *
150svc_tp_create(
151	SVCPOOL *pool,
152	void (*dispatch)(struct svc_req *, SVCXPRT *),
153	rpcprog_t prognum,		/* Program number */
154	rpcvers_t versnum,		/* Version number */
155	const char *uaddr,		/* Address (or null for default) */
156	const struct netconfig *nconf) /* Netconfig structure for the network */
157{
158	struct netconfig nconfcopy;
159	struct netbuf *taddr;
160	struct t_bind bind;
161	SVCXPRT *xprt;
162
163	if (nconf == NULL) {
164		printf(
165	"svc_tp_create: invalid netconfig structure for prog %u vers %u\n",
166				(unsigned)prognum, (unsigned)versnum);
167		return (NULL);
168	}
169	if (uaddr) {
170		taddr = uaddr2taddr(nconf, uaddr);
171		bind.addr = *taddr;
172		free(taddr, M_RPC);
173		bind.qlen = -1;
174		xprt = svc_tli_create(pool, NULL, nconf, &bind, 0, 0);
175		free(bind.addr.buf, M_RPC);
176	} else {
177		xprt = svc_tli_create(pool, NULL, nconf, NULL, 0, 0);
178	}
179	if (xprt == NULL) {
180		return (NULL);
181	}
182	/*LINTED const castaway*/
183	nconfcopy = *nconf;
184	(void) rpcb_unset(prognum, versnum, &nconfcopy);
185	if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
186		printf(
187		"svc_tp_create: Could not register prog %u vers %u on %s\n",
188				(unsigned)prognum, (unsigned)versnum,
189				nconf->nc_netid);
190		xprt_unregister(xprt);
191		SVC_RELEASE(xprt);
192		return (NULL);
193	}
194	return (xprt);
195}
196
197/*
198 * If so is NULL, then it opens a socket for the given transport
199 * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
200 * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
201 * NULL bindadr and Connection oriented transports, the value of qlen
202 * is set to 8.
203 *
204 * If sendsz or recvsz are zero, their default values are chosen.
205 */
206SVCXPRT *
207svc_tli_create(
208	SVCPOOL *pool,
209	struct socket *so,		/* Connection end point */
210	const struct netconfig *nconf,	/* Netconfig struct for nettoken */
211	const struct t_bind *bindaddr,	/* Local bind address */
212	size_t sendsz,			/* Max sendsize */
213	size_t recvsz)			/* Max recvsize */
214{
215	SVCXPRT *xprt = NULL;		/* service handle */
216	bool_t madeso = FALSE;		/* whether so opened here  */
217	struct __rpc_sockinfo si;
218	struct sockaddr_storage ss;
219
220	if (!so) {
221		if (nconf == NULL) {
222			printf("svc_tli_create: invalid netconfig\n");
223			return (NULL);
224		}
225		so = __rpc_nconf2socket(nconf);
226		if (!so) {
227			printf(
228			    "svc_tli_create: could not open connection for %s\n",
229					nconf->nc_netid);
230			return (NULL);
231		}
232		__rpc_nconf2sockinfo(nconf, &si);
233		madeso = TRUE;
234	} else {
235		/*
236		 * It is an open socket. Get the transport info.
237		 */
238		if (!__rpc_socket2sockinfo(so, &si)) {
239			printf(
240		"svc_tli_create: could not get transport information\n");
241			return (NULL);
242		}
243	}
244
245	/*
246	 * If the socket is unbound, try to bind it.
247	 */
248	if (madeso || !__rpc_sockisbound(so)) {
249		if (bindaddr == NULL) {
250			if (bindresvport(so, NULL)) {
251				memset(&ss, 0, sizeof ss);
252				ss.ss_family = si.si_af;
253				ss.ss_len = si.si_alen;
254				if (sobind(so, (struct sockaddr *)&ss,
255					curthread)) {
256					printf(
257			"svc_tli_create: could not bind to anonymous port\n");
258					goto freedata;
259				}
260			}
261			solisten(so, -1, curthread);
262		} else {
263			if (bindresvport(so,
264				(struct sockaddr *)bindaddr->addr.buf)) {
265				printf(
266		"svc_tli_create: could not bind to requested address\n");
267				goto freedata;
268			}
269			solisten(so, (int)bindaddr->qlen, curthread);
270		}
271
272	}
273	/*
274	 * call transport specific function.
275	 */
276	switch (si.si_socktype) {
277		case SOCK_STREAM:
278#if 0
279			slen = sizeof ss;
280			if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
281			    == 0) {
282				/* accepted socket */
283				xprt = svc_fd_create(fd, sendsz, recvsz);
284			} else
285#endif
286				xprt = svc_vc_create(pool, so, sendsz, recvsz);
287			if (!nconf || !xprt)
288				break;
289#if 0
290			/* XXX fvdl */
291			if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
292			    strcmp(nconf->nc_protofmly, "inet6") == 0)
293				(void) __svc_vc_setflag(xprt, TRUE);
294#endif
295			break;
296		case SOCK_DGRAM:
297			xprt = svc_dg_create(pool, so, sendsz, recvsz);
298			break;
299		default:
300			printf("svc_tli_create: bad service type");
301			goto freedata;
302	}
303
304	if (xprt == NULL)
305		/*
306		 * The error messages here are spitted out by the lower layers:
307		 * svc_vc_create(), svc_fd_create() and svc_dg_create().
308		 */
309		goto freedata;
310
311	/* Fill in type of service */
312	xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
313
314	if (nconf) {
315		xprt->xp_netid = strdup(nconf->nc_netid, M_RPC);
316	}
317	return (xprt);
318
319freedata:
320	if (madeso)
321		(void)soclose(so);
322	if (xprt) {
323		if (!madeso) /* so that svc_destroy doesnt close fd */
324			xprt->xp_socket = NULL;
325		xprt_unregister(xprt);
326	}
327	return (NULL);
328}
329