1/*	$NetBSD: svc_generic.c,v 1.3 2000/07/06 03:10:35 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31/*
32 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
33 */
34
35#if defined(LIBC_SCCS) && !defined(lint)
36#ident	"@(#)svc_generic.c	1.19	94/04/24 SMI"
37static char sccsid[] = "@(#)svc_generic.c 1.21 89/02/28 Copyr 1988 Sun Micro";
38#endif
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: releng/10.3/sys/rpc/svc_generic.c 281520 2015-04-14 09:58:10Z mav $");
41
42/*
43 * svc_generic.c, Server side for RPC.
44 *
45 */
46
47#include "opt_inet6.h"
48
49#include <sys/param.h>
50#include <sys/lock.h>
51#include <sys/kernel.h>
52#include <sys/malloc.h>
53#include <sys/mutex.h>
54#include <sys/protosw.h>
55#include <sys/queue.h>
56#include <sys/socket.h>
57#include <sys/socketvar.h>
58#include <sys/systm.h>
59#include <sys/sx.h>
60#include <sys/ucred.h>
61
62#include <net/vnet.h>
63
64#include <rpc/rpc.h>
65#include <rpc/rpcb_clnt.h>
66#include <rpc/nettype.h>
67
68#include <rpc/rpc_com.h>
69
70extern int __svc_vc_setflag(SVCXPRT *, int);
71
72/*
73 * The highest level interface for server creation.
74 * It tries for all the nettokens in that particular class of token
75 * and returns the number of handles it can create and/or find.
76 *
77 * It creates a link list of all the handles it could create.
78 * If svc_create() is called multiple times, it uses the handle
79 * created earlier instead of creating a new handle every time.
80 */
81int
82svc_create(
83	SVCPOOL *pool,
84	void (*dispatch)(struct svc_req *, SVCXPRT *),
85	rpcprog_t prognum,		/* Program number */
86	rpcvers_t versnum,		/* Version number */
87	const char *nettype)		/* Networktype token */
88{
89	int g, num = 0;
90	SVCGROUP *grp;
91	SVCXPRT *xprt;
92	struct netconfig *nconf;
93	void *handle;
94
95	if ((handle = __rpc_setconf(nettype)) == NULL) {
96		printf("svc_create: unknown protocol");
97		return (0);
98	}
99	while ((nconf = __rpc_getconf(handle)) != NULL) {
100		for (g = 0; g < SVC_MAXGROUPS; g++) {
101			grp = &pool->sp_groups[g];
102			mtx_lock(&grp->sg_lock);
103			TAILQ_FOREACH(xprt, &grp->sg_xlist, xp_link) {
104				if (strcmp(xprt->xp_netid, nconf->nc_netid))
105					continue;
106				/* Found an old one, use it */
107				mtx_unlock(&grp->sg_lock);
108				(void) rpcb_unset(prognum, versnum, nconf);
109				if (svc_reg(xprt, prognum, versnum,
110					dispatch, nconf) == FALSE) {
111					printf(
112		"svc_create: could not register prog %u vers %u on %s\n",
113					(unsigned)prognum, (unsigned)versnum,
114					 nconf->nc_netid);
115					mtx_lock(&grp->sg_lock);
116				} else {
117					num++;
118					mtx_lock(&grp->sg_lock);
119					break;
120				}
121			}
122			mtx_unlock(&grp->sg_lock);
123		}
124		if (xprt == NULL) {
125			/* It was not found. Now create a new one */
126			xprt = svc_tp_create(pool, dispatch, prognum, versnum,
127			    NULL, nconf);
128			if (xprt) {
129				num++;
130				SVC_RELEASE(xprt);
131			}
132		}
133	}
134	__rpc_endconf(handle);
135	/*
136	 * In case of num == 0; the error messages are generated by the
137	 * underlying layers; and hence not needed here.
138	 */
139	return (num);
140}
141
142/*
143 * The high level interface to svc_tli_create().
144 * It tries to create a server for "nconf" and registers the service
145 * with the rpcbind. It calls svc_tli_create();
146 */
147SVCXPRT *
148svc_tp_create(
149	SVCPOOL *pool,
150	void (*dispatch)(struct svc_req *, SVCXPRT *),
151	rpcprog_t prognum,		/* Program number */
152	rpcvers_t versnum,		/* Version number */
153	const char *uaddr,		/* Address (or null for default) */
154	const struct netconfig *nconf) /* Netconfig structure for the network */
155{
156	struct netconfig nconfcopy;
157	struct netbuf *taddr;
158	struct t_bind bind;
159	SVCXPRT *xprt;
160
161	if (nconf == NULL) {
162		printf(
163	"svc_tp_create: invalid netconfig structure for prog %u vers %u\n",
164				(unsigned)prognum, (unsigned)versnum);
165		return (NULL);
166	}
167	if (uaddr) {
168		taddr = uaddr2taddr(nconf, uaddr);
169		bind.addr = *taddr;
170		free(taddr, M_RPC);
171		bind.qlen = -1;
172		xprt = svc_tli_create(pool, NULL, nconf, &bind, 0, 0);
173		free(bind.addr.buf, M_RPC);
174	} else {
175		xprt = svc_tli_create(pool, NULL, nconf, NULL, 0, 0);
176	}
177	if (xprt == NULL) {
178		return (NULL);
179	}
180	/*LINTED const castaway*/
181	nconfcopy = *nconf;
182	(void) rpcb_unset(prognum, versnum, &nconfcopy);
183	if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
184		printf(
185		"svc_tp_create: Could not register prog %u vers %u on %s\n",
186				(unsigned)prognum, (unsigned)versnum,
187				nconf->nc_netid);
188		xprt_unregister(xprt);
189		SVC_RELEASE(xprt);
190		return (NULL);
191	}
192	return (xprt);
193}
194
195/*
196 * If so is NULL, then it opens a socket for the given transport
197 * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
198 * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
199 * NULL bindadr and Connection oriented transports, the value of qlen
200 * is set to 8.
201 *
202 * If sendsz or recvsz are zero, their default values are chosen.
203 */
204SVCXPRT *
205svc_tli_create(
206	SVCPOOL *pool,
207	struct socket *so,		/* Connection end point */
208	const struct netconfig *nconf,	/* Netconfig struct for nettoken */
209	const struct t_bind *bindaddr,	/* Local bind address */
210	size_t sendsz,			/* Max sendsize */
211	size_t recvsz)			/* Max recvsize */
212{
213	SVCXPRT *xprt = NULL;		/* service handle */
214	bool_t madeso = FALSE;		/* whether so opened here  */
215	struct __rpc_sockinfo si;
216	struct sockaddr_storage ss;
217
218	if (!so) {
219		if (nconf == NULL) {
220			printf("svc_tli_create: invalid netconfig\n");
221			return (NULL);
222		}
223		so = __rpc_nconf2socket(nconf);
224		if (!so) {
225			printf(
226			    "svc_tli_create: could not open connection for %s\n",
227					nconf->nc_netid);
228			return (NULL);
229		}
230		__rpc_nconf2sockinfo(nconf, &si);
231		madeso = TRUE;
232	} else {
233		/*
234		 * It is an open socket. Get the transport info.
235		 */
236		if (!__rpc_socket2sockinfo(so, &si)) {
237			printf(
238		"svc_tli_create: could not get transport information\n");
239			return (NULL);
240		}
241	}
242
243	/*
244	 * If the socket is unbound, try to bind it.
245	 */
246	if (madeso || !__rpc_sockisbound(so)) {
247		if (bindaddr == NULL) {
248			if (bindresvport(so, NULL)) {
249				memset(&ss, 0, sizeof ss);
250				ss.ss_family = si.si_af;
251				ss.ss_len = si.si_alen;
252				if (sobind(so, (struct sockaddr *)&ss,
253					curthread)) {
254					printf(
255			"svc_tli_create: could not bind to anonymous port\n");
256					goto freedata;
257				}
258			}
259			solisten(so, -1, curthread);
260		} else {
261			if (bindresvport(so,
262				(struct sockaddr *)bindaddr->addr.buf)) {
263				printf(
264		"svc_tli_create: could not bind to requested address\n");
265				goto freedata;
266			}
267			solisten(so, (int)bindaddr->qlen, curthread);
268		}
269
270	}
271	/*
272	 * call transport specific function.
273	 */
274	switch (si.si_socktype) {
275		case SOCK_STREAM:
276#if 0
277			slen = sizeof ss;
278			if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
279			    == 0) {
280				/* accepted socket */
281				xprt = svc_fd_create(fd, sendsz, recvsz);
282			} else
283#endif
284				xprt = svc_vc_create(pool, so, 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(pool, so, sendsz, recvsz);
296			break;
297		default:
298			printf("svc_tli_create: bad service type");
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, M_RPC);
314	}
315	return (xprt);
316
317freedata:
318	if (madeso)
319		(void)soclose(so);
320	if (xprt) {
321		if (!madeso) /* so that svc_destroy doesnt close fd */
322			xprt->xp_socket = NULL;
323		xprt_unregister(xprt);
324	}
325	return (NULL);
326}
327