1/*	$NetBSD: svc_generic.c,v 1.11 2012/01/02 21:29:29 dholland 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
43static char sccsid[] = "@(#)svc_generic.c 1.21 89/02/28 Copyr 1988 Sun Micro";
44#else
45__RCSID("$NetBSD: svc_generic.c,v 1.11 2012/01/02 21:29:29 dholland 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 "rpc_internal.h"
69
70#ifdef __weak_alias
71__weak_alias(svc_create,_svc_create)
72__weak_alias(svc_tp_create,_svc_tp_create)
73__weak_alias(svc_tli_create,_svc_tli_create)
74#endif
75
76extern int __svc_vc_setflag __P((SVCXPRT *, int));
77
78/*
79 * The highest level interface for server creation.
80 * It tries for all the nettokens in that particular class of token
81 * and returns the number of handles it can create and/or find.
82 *
83 * It creates a link list of all the handles it could create.
84 * If svc_create() is called multiple times, it uses the handle
85 * created earlier instead of creating a new handle every time.
86 */
87int
88svc_create(dispatch, prognum, versnum, nettype)
89	void (*dispatch) __P((struct svc_req *, SVCXPRT *));
90	rpcprog_t prognum;		/* Program number */
91	rpcvers_t versnum;		/* Version number */
92	const char *nettype;		/* Networktype token */
93{
94	struct xlist {
95		SVCXPRT *xprt;		/* Server handle */
96		struct xlist *next;	/* Next item */
97	} *l;
98	static struct xlist *xprtlist;	/* A link list of all the handles */
99	int num = 0;
100	SVCXPRT *xprt;
101	struct netconfig *nconf;
102	void *handle;
103#ifdef _REENTRANT
104	extern mutex_t xprtlist_lock;
105#endif
106
107/* VARIABLES PROTECTED BY xprtlist_lock: xprtlist */
108
109	if ((handle = __rpc_setconf(nettype)) == NULL) {
110		warnx("svc_create: unknown protocol");
111		return (0);
112	}
113	while ((nconf = __rpc_getconf(handle)) != NULL) {
114		mutex_lock(&xprtlist_lock);
115		for (l = xprtlist; l; l = l->next) {
116			if (strcmp(l->xprt->xp_netid, nconf->nc_netid) == 0) {
117				/* Found an old one, use it */
118				(void) rpcb_unset(prognum, versnum, nconf);
119				if (svc_reg(l->xprt, prognum, versnum,
120					dispatch, nconf) == FALSE)
121					warnx(
122		"svc_create: could not register prog %u vers %u on %s",
123					(unsigned)prognum, (unsigned)versnum,
124					 nconf->nc_netid);
125				else
126					num++;
127				break;
128			}
129		}
130		if (l == NULL) {
131			/* It was not found. Now create a new one */
132			xprt = svc_tp_create(dispatch, prognum, versnum, nconf);
133			if (xprt) {
134				l = malloc(sizeof(*l));
135				if (l == NULL) {
136					warnx("svc_create: no memory");
137					mutex_unlock(&xprtlist_lock);
138					return (0);
139				}
140				l->xprt = xprt;
141				l->next = xprtlist;
142				xprtlist = l;
143				num++;
144			}
145		}
146		mutex_unlock(&xprtlist_lock);
147	}
148	__rpc_endconf(handle);
149	/*
150	 * In case of num == 0; the error messages are generated by the
151	 * underlying layers; and hence not needed here.
152	 */
153	return (num);
154}
155
156/*
157 * The high level interface to svc_tli_create().
158 * It tries to create a server for "nconf" and registers the service
159 * with the rpcbind. It calls svc_tli_create();
160 */
161SVCXPRT *
162svc_tp_create(dispatch, prognum, versnum, nconf)
163	void (*dispatch) __P((struct svc_req *, SVCXPRT *));
164	rpcprog_t prognum;		/* Program number */
165	rpcvers_t versnum;		/* Version number */
166	const struct netconfig *nconf; /* Netconfig structure for the network */
167{
168	SVCXPRT *xprt;
169
170	if (nconf == NULL) {
171		warnx(
172	"svc_tp_create: invalid netconfig structure for prog %u vers %u",
173				(unsigned)prognum, (unsigned)versnum);
174		return (NULL);
175	}
176	xprt = svc_tli_create(RPC_ANYFD, nconf, NULL, 0, 0);
177	if (xprt == NULL) {
178		return (NULL);
179	}
180	(void) rpcb_unset(prognum, versnum, __UNCONST(nconf));
181	if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
182		warnx(
183		"svc_tp_create: Could not register prog %u vers %u on %s",
184				(unsigned)prognum, (unsigned)versnum,
185				nconf->nc_netid);
186		SVC_DESTROY(xprt);
187		return (NULL);
188	}
189	return (xprt);
190}
191
192/*
193 * If fd is RPC_ANYFD, then it opens a fd for the given transport
194 * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
195 * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
196 * NULL bindadr and Connection oriented transports, the value of qlen
197 * is set to 8.
198 *
199 * If sendsz or recvsz are zero, their default values are chosen.
200 */
201SVCXPRT *
202svc_tli_create(fd, nconf, bindaddr, sendsz, recvsz)
203	int fd;				/* Connection end point */
204	const struct netconfig *nconf;	/* Netconfig struct for nettoken */
205	const struct t_bind *bindaddr;	/* Local bind address */
206	u_int sendsz;			/* Max sendsize */
207	u_int recvsz;			/* Max recvsize */
208{
209	SVCXPRT *xprt = NULL;		/* service handle */
210	bool_t madefd = FALSE;		/* whether fd opened here  */
211	struct __rpc_sockinfo si;
212	struct sockaddr_storage ss;
213	socklen_t slen;
214
215	if (fd == RPC_ANYFD) {
216		if (nconf == NULL) {
217			warnx("svc_tli_create: invalid netconfig");
218			return (NULL);
219		}
220		fd = __rpc_nconf2fd(nconf);
221		if (fd == -1) {
222			warnx(
223			    "svc_tli_create: could not open connection for %s",
224					nconf->nc_netid);
225			return (NULL);
226		}
227		__rpc_nconf2sockinfo(nconf, &si);
228		madefd = TRUE;
229	} else {
230		/*
231		 * It is an open descriptor. Get the transport info.
232		 */
233		if (!__rpc_fd2sockinfo(fd, &si)) {
234			warnx(
235		"svc_tli_create: could not get transport information");
236			return (NULL);
237		}
238	}
239
240	/*
241	 * If the fd is unbound, try to bind it.
242	 */
243	if (madefd || !__rpc_sockisbound(fd)) {
244		if (bindaddr == NULL) {
245			if (bindresvport(fd, NULL) < 0) {
246				memset(&ss, 0, sizeof ss);
247				ss.ss_family = si.si_af;
248				ss.ss_len = si.si_alen;
249				if (bind(fd, (struct sockaddr *)(void *)&ss,
250				    (socklen_t)si.si_alen) < 0) {
251					warnx(
252			"svc_tli_create: could not bind to anonymous port");
253					goto freedata;
254				}
255			}
256			listen(fd, SOMAXCONN);
257		} else {
258			if (bind(fd,
259			    (struct sockaddr *)bindaddr->addr.buf,
260			    (socklen_t)si.si_alen) < 0) {
261				warnx(
262		"svc_tli_create: could not bind to requested address");
263				goto freedata;
264			}
265			listen(fd, (int)bindaddr->qlen);
266		}
267
268	}
269	/*
270	 * call transport specific function.
271	 */
272	switch (si.si_socktype) {
273		case SOCK_STREAM:
274			slen = sizeof ss;
275			if (getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
276			    == 0) {
277				/* accepted socket */
278				xprt = svc_fd_create(fd, sendsz, recvsz);
279			} else
280				xprt = svc_vc_create(fd, sendsz, recvsz);
281			if (!nconf || !xprt)
282				break;
283#if 0
284			/* XXX fvdl */
285			if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
286			    strcmp(nconf->nc_protofmly, "inet6") == 0)
287				(void) __svc_vc_setflag(xprt, TRUE);
288#endif
289			break;
290		case SOCK_DGRAM:
291			xprt = svc_dg_create(fd, sendsz, recvsz);
292			break;
293		default:
294			warnx("svc_tli_create: bad service type");
295			goto freedata;
296	}
297
298	if (xprt == NULL)
299		/*
300		 * The error messages here are spitted out by the lower layers:
301		 * svc_vc_create(), svc_fd_create() and svc_dg_create().
302		 */
303		goto freedata;
304
305	/* Fill in type of service */
306	xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
307
308	if (nconf) {
309		xprt->xp_netid = strdup(nconf->nc_netid);
310		xprt->xp_tp = strdup(nconf->nc_device);
311		if (xprt->xp_netid == NULL || xprt->xp_tp == NULL) {
312			svc_destroy(xprt);
313			return NULL;
314		}
315	}
316	return (xprt);
317
318freedata:
319	if (madefd)
320		(void) close(fd);
321	return (NULL);
322}
323