svc_generic.c revision 261046 
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: stable/10/lib/libc/rpc/svc_generic.c 261046 2014-01-22 23:45:27Z mav $");
41
42/*
43 * svc_generic.c, Server side for RPC.
44 *
45 */
46
47#include "namespace.h"
48#include "reentrant.h"
49#include <sys/types.h>
50#include <sys/socket.h>
51#include <netinet/in.h>
52#include <rpc/rpc.h>
53#include <rpc/nettype.h>
54#include <stdio.h>
55#include <errno.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59#include <err.h>
60#include "un-namespace.h"
61
62#include "rpc_com.h"
63#include "mt_misc.h"
64
65extern 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 */
76int
77svc_create(dispatch, prognum, versnum, nettype)
78	void (*dispatch)(struct svc_req *, SVCXPRT *);
79	rpcprog_t prognum;		/* Program number */
80	rpcvers_t versnum;		/* Version number */
81	const char *nettype;		/* Networktype token */
82{
83	struct xlist {
84		SVCXPRT *xprt;		/* Server handle */
85		struct xlist *next;	/* Next item */
86	} *l;
87	static struct xlist *xprtlist;	/* A link list of all the handles */
88	int num = 0;
89	SVCXPRT *xprt;
90	struct netconfig *nconf;
91	void *handle;
92
93/* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */
94
95	if ((handle = __rpc_setconf(nettype)) == NULL) {
96		warnx("svc_create: unknown protocol");
97		return (0);
98	}
99	while ((nconf = __rpc_getconf(handle)) != NULL) {
100		mutex_lock(&xprtlist_lock);
101		for (l = xprtlist; l; l = l->next) {
102			if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
103				/* Found an old one, use it */
104				(void) rpcb_unset(prognum, versnum, nconf);
105				if (svc_reg(l->xprt, prognum, versnum,
106					dispatch, nconf) == FALSE)
107					warnx(
108		"svc_create: could not register prog %u vers %u on %s",
109					(unsigned)prognum, (unsigned)versnum,
110					 nconf->nc_netid);
111				else
112					num++;
113				break;
114			}
115		}
116		if (l == NULL) {
117			/* It was not found. Now create a new one */
118			xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
119			if (xprt) {
120				l = (struct xlist *)malloc(sizeof (*l));
121				if (l == NULL) {
122					warnx("svc_create: no memory");
123					mutex_unlock(&xprtlist_lock);
124					return (0);
125				}
126				l->xprt = xprt;
127				l->next = xprtlist;
128				xprtlist = l;
129				num++;
130			}
131		}
132		mutex_unlock(&xprtlist_lock);
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(dispatch, prognum, versnum, nconf)
149	void (*dispatch)(struct svc_req *, SVCXPRT *);
150	rpcprog_t prognum;		/* Program number */
151	rpcvers_t versnum;		/* Version number */
152	const struct netconfig *nconf; /* Netconfig structure for the network */
153{
154	SVCXPRT *xprt;
155
156	if (nconf == NULL) {
157		warnx(
158	"svc_tp_create: invalid netconfig structure for prog %u vers %u",
159				(unsigned)prognum, (unsigned)versnum);
160		return (NULL);
161	}
162	xprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
163	if (xprt == NULL) {
164		return (NULL);
165	}
166	/*LINTED const castaway*/
167	(void) rpcb_unset(prognum, versnum, (struct netconfig *) nconf);
168	if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
169		warnx(
170		"svc_tp_create: Could not register prog %u vers %u on %s",
171				(unsigned)prognum, (unsigned)versnum,
172				nconf->nc_netid);
173		SVC_DESTROY(xprt);
174		return (NULL);
175	}
176	return (xprt);
177}
178
179/*
180 * If fd is RPC_ANYFD, then it opens a fd for the given transport
181 * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
182 * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
183 * NULL bindadr and Connection oriented transports, the value of qlen
184 * is set to 8.
185 *
186 * If sendsz or recvsz are zero, their default values are chosen.
187 */
188SVCXPRT *
189svc_tli_create(fd, nconf, bindaddr, sendsz, recvsz)
190	int fd;				/* Connection end point */
191	const struct netconfig *nconf;	/* Netconfig struct for nettoken */
192	const struct t_bind *bindaddr;	/* Local bind address */
193	u_int sendsz;			/* Max sendsize */
194	u_int recvsz;			/* Max recvsize */
195{
196	SVCXPRT *xprt = NULL;		/* service handle */
197	bool_t madefd = FALSE;		/* whether fd opened here  */
198	struct __rpc_sockinfo si;
199	struct sockaddr_storage ss;
200	socklen_t slen;
201
202	if (fd == RPC_ANYFD) {
203		if (nconf == NULL) {
204			warnx("svc_tli_create: invalid netconfig");
205			return (NULL);
206		}
207		fd = __rpc_nconf2fd(nconf);
208		if (fd == -1) {
209			warnx(
210			    "svc_tli_create: could not open connection for %s",
211					nconf->nc_netid);
212			return (NULL);
213		}
214		__rpc_nconf2sockinfo(nconf, &si);
215		madefd = TRUE;
216	} else {
217		/*
218		 * It is an open descriptor. Get the transport info.
219		 */
220		if (!__rpc_fd2sockinfo(fd, &si)) {
221			warnx(
222		"svc_tli_create: could not get transport information");
223			return (NULL);
224		}
225	}
226
227	/*
228	 * If the fd is unbound, try to bind it.
229	 */
230	if (madefd || !__rpc_sockisbound(fd)) {
231		if (bindaddr == NULL) {
232			if (bindresvport(fd, NULL) < 0) {
233				memset(&ss, 0, sizeof ss);
234				ss.ss_family = si.si_af;
235				ss.ss_len = si.si_alen;
236				if (_bind(fd, (struct sockaddr *)(void *)&ss,
237				    (socklen_t)si.si_alen) < 0) {
238					warnx(
239			"svc_tli_create: could not bind to anonymous port");
240					goto freedata;
241				}
242			}
243			_listen(fd, SOMAXCONN);
244		} else {
245			if (_bind(fd,
246			    (struct sockaddr *)bindaddr->addr.buf,
247			    (socklen_t)si.si_alen) < 0) {
248				warnx(
249		"svc_tli_create: could not bind to requested address");
250				goto freedata;
251			}
252			_listen(fd, (int)bindaddr->qlen);
253		}
254
255	}
256	/*
257	 * call transport specific function.
258	 */
259	switch (si.si_socktype) {
260		case SOCK_STREAM:
261			slen = sizeof ss;
262			if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
263			    == 0) {
264				/* accepted socket */
265				xprt = svc_fd_create(fd, sendsz, recvsz);
266			} else
267				xprt = svc_vc_create(fd, sendsz, recvsz);
268			if (!nconf || !xprt)
269				break;
270#if 0
271			/* XXX fvdl */
272			if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
273			    strcmp(nconf->nc_protofmly, "inet6") == 0)
274				(void) __svc_vc_setflag(xprt, TRUE);
275#endif
276			break;
277		case SOCK_DGRAM:
278			xprt = svc_dg_create(fd, sendsz, recvsz);
279			break;
280		default:
281			warnx("svc_tli_create: bad service type");
282			goto freedata;
283	}
284
285	if (xprt == NULL)
286		/*
287		 * The error messages here are spitted out by the lower layers:
288		 * svc_vc_create(), svc_fd_create() and svc_dg_create().
289		 */
290		goto freedata;
291
292	/* Fill in type of service */
293	xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
294
295	if (nconf) {
296		xprt->xp_netid = strdup(nconf->nc_netid);
297		xprt->xp_tp = strdup(nconf->nc_device);
298	}
299	return (xprt);
300
301freedata:
302	if (madefd)
303		(void)_close(fd);
304	if (xprt) {
305		if (!madefd) /* so that svc_destroy doesnt close fd */
306			xprt->xp_fd = RPC_ANYFD;
307		SVC_DESTROY(xprt);
308	}
309	return (NULL);
310}
311