FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc_generic.c
1 /* $NetBSD: svc_generic.c,v 1.3 2000/07/06 03:10:35 christos Exp $ */
2
3 /*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California 94043
30 */
31
32 /*
33 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #ident "@(#)svc_generic.c 1.19 94/04/24 SMI"
38 static char sccsid[] = "@(#)svc_generic.c 1.21 89/02/28 Copyr 1988 Sun Micro";
39 #endif
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD: releng/7.4/sys/rpc/svc_generic.c 178061 2008-04-10 09:39:29Z dfr $");
42
43 /*
44 * svc_generic.c, Server side for RPC.
45 *
46 */
47
48 #include "opt_inet6.h"
49
50 #include <sys/param.h>
51 #include <sys/lock.h>
52 #include <sys/kernel.h>
53 #include <sys/malloc.h>
54 #include <sys/mutex.h>
55 #include <sys/protosw.h>
56 #include <sys/queue.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/systm.h>
60 #include <sys/sx.h>
61 #include <sys/ucred.h>
62
63 #include <rpc/rpc.h>
64 #include <rpc/rpcb_clnt.h>
65 #include <rpc/nettype.h>
66
67 #include <rpc/rpc_com.h>
68
69 extern int __svc_vc_setflag(SVCXPRT *, int);
70
71 /*
72 * The highest level interface for server creation.
73 * It tries for all the nettokens in that particular class of token
74 * and returns the number of handles it can create and/or find.
75 *
76 * It creates a link list of all the handles it could create.
77 * If svc_create() is called multiple times, it uses the handle
78 * created earlier instead of creating a new handle every time.
79 */
80 int
81 svc_create(
82 SVCPOOL *pool,
83 void (*dispatch)(struct svc_req *, SVCXPRT *),
84 rpcprog_t prognum, /* Program number */
85 rpcvers_t versnum, /* Version number */
86 const char *nettype) /* Networktype token */
87 {
88 int num = 0;
89 SVCXPRT *xprt;
90 struct netconfig *nconf;
91 void *handle;
92
93 if ((handle = __rpc_setconf(nettype)) == NULL) {
94 printf("svc_create: unknown protocol");
95 return (0);
96 }
97 while ((nconf = __rpc_getconf(handle)) != NULL) {
98 mtx_lock(&pool->sp_lock);
99 TAILQ_FOREACH(xprt, &pool->sp_xlist, xp_link) {
100 if (strcmp(xprt->xp_netid, nconf->nc_netid) == 0) {
101 /* Found an old one, use it */
102 mtx_unlock(&pool->sp_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(&pool->sp_lock);
111 } else {
112 num++;
113 mtx_lock(&pool->sp_lock);
114 break;
115 }
116 }
117 }
118 mtx_unlock(&pool->sp_lock);
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 }
126 }
127 __rpc_endconf(handle);
128 /*
129 * In case of num == 0; the error messages are generated by the
130 * underlying layers; and hence not needed here.
131 */
132 return (num);
133 }
134
135 /*
136 * The high level interface to svc_tli_create().
137 * It tries to create a server for "nconf" and registers the service
138 * with the rpcbind. It calls svc_tli_create();
139 */
140 SVCXPRT *
141 svc_tp_create(
142 SVCPOOL *pool,
143 void (*dispatch)(struct svc_req *, SVCXPRT *),
144 rpcprog_t prognum, /* Program number */
145 rpcvers_t versnum, /* Version number */
146 const char *uaddr, /* Address (or null for default) */
147 const struct netconfig *nconf) /* Netconfig structure for the network */
148 {
149 struct netconfig nconfcopy;
150 struct netbuf *taddr;
151 struct t_bind bind;
152 SVCXPRT *xprt;
153
154 if (nconf == NULL) {
155 printf(
156 "svc_tp_create: invalid netconfig structure for prog %u vers %u\n",
157 (unsigned)prognum, (unsigned)versnum);
158 return (NULL);
159 }
160 if (uaddr) {
161 taddr = uaddr2taddr(nconf, uaddr);
162 bind.addr = *taddr;
163 free(taddr, M_RPC);
164 bind.qlen = SOMAXCONN;
165 xprt = svc_tli_create(pool, NULL, nconf, &bind, 0, 0);
166 free(bind.addr.buf, M_RPC);
167 } else {
168 xprt = svc_tli_create(pool, NULL, nconf, NULL, 0, 0);
169 }
170 if (xprt == NULL) {
171 return (NULL);
172 }
173 /*LINTED const castaway*/
174 nconfcopy = *nconf;
175 (void) rpcb_unset(prognum, versnum, &nconfcopy);
176 if (svc_reg(xprt, prognum, versnum, dispatch, nconf) == FALSE) {
177 printf(
178 "svc_tp_create: Could not register prog %u vers %u on %s\n",
179 (unsigned)prognum, (unsigned)versnum,
180 nconf->nc_netid);
181 SVC_DESTROY(xprt);
182 return (NULL);
183 }
184 return (xprt);
185 }
186
187 /*
188 * Bind a socket to a privileged IP port
189 */
190 int bindresvport(struct socket *so, struct sockaddr *sa);
191 int
192 bindresvport(struct socket *so, struct sockaddr *sa)
193 {
194 int old, error, af;
195 bool_t freesa = FALSE;
196 struct sockaddr_in *sin;
197 #ifdef INET6
198 struct sockaddr_in6 *sin6;
199 #endif
200 struct sockopt opt;
201 int proto, portrange, portlow;
202 u_int16_t *portp;
203 socklen_t salen;
204
205 if (sa == NULL) {
206 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
207 if (error)
208 return (error);
209 freesa = TRUE;
210 af = sa->sa_family;
211 salen = sa->sa_len;
212 memset(sa, 0, sa->sa_len);
213 } else {
214 af = sa->sa_family;
215 salen = sa->sa_len;
216 }
217
218 switch (af) {
219 case AF_INET:
220 proto = IPPROTO_IP;
221 portrange = IP_PORTRANGE;
222 portlow = IP_PORTRANGE_LOW;
223 sin = (struct sockaddr_in *)sa;
224 portp = &sin->sin_port;
225 break;
226 #ifdef INET6
227 case AF_INET6:
228 proto = IPPROTO_IPV6;
229 portrange = IPV6_PORTRANGE;
230 portlow = IPV6_PORTRANGE_LOW;
231 sin6 = (struct sockaddr_in6 *)sa;
232 portp = &sin6->sin6_port;
233 break;
234 #endif
235 default:
236 return (EPFNOSUPPORT);
237 }
238
239 sa->sa_family = af;
240 sa->sa_len = salen;
241
242 if (*portp == 0) {
243 bzero(&opt, sizeof(opt));
244 opt.sopt_dir = SOPT_GET;
245 opt.sopt_level = proto;
246 opt.sopt_name = portrange;
247 opt.sopt_val = &old;
248 opt.sopt_valsize = sizeof(old);
249 error = sogetopt(so, &opt);
250 if (error)
251 goto out;
252
253 opt.sopt_dir = SOPT_SET;
254 opt.sopt_val = &portlow;
255 error = sosetopt(so, &opt);
256 if (error)
257 goto out;
258 }
259
260 error = sobind(so, sa, curthread);
261
262 if (*portp == 0) {
263 if (error) {
264 opt.sopt_dir = SOPT_SET;
265 opt.sopt_val = &old;
266 sosetopt(so, &opt);
267 }
268 }
269 out:
270 if (freesa)
271 free(sa, M_SONAME);
272
273 return (error);
274 }
275
276 /*
277 * If so is NULL, then it opens a socket for the given transport
278 * provider (nconf cannot be NULL then). If the t_state is T_UNBND and
279 * bindaddr is NON-NULL, it performs a t_bind using the bindaddr. For
280 * NULL bindadr and Connection oriented transports, the value of qlen
281 * is set to 8.
282 *
283 * If sendsz or recvsz are zero, their default values are chosen.
284 */
285 SVCXPRT *
286 svc_tli_create(
287 SVCPOOL *pool,
288 struct socket *so, /* Connection end point */
289 const struct netconfig *nconf, /* Netconfig struct for nettoken */
290 const struct t_bind *bindaddr, /* Local bind address */
291 size_t sendsz, /* Max sendsize */
292 size_t recvsz) /* Max recvsize */
293 {
294 SVCXPRT *xprt = NULL; /* service handle */
295 bool_t madeso = FALSE; /* whether so opened here */
296 struct __rpc_sockinfo si;
297 struct sockaddr_storage ss;
298
299 if (!so) {
300 if (nconf == NULL) {
301 printf("svc_tli_create: invalid netconfig\n");
302 return (NULL);
303 }
304 so = __rpc_nconf2socket(nconf);
305 if (!so) {
306 printf(
307 "svc_tli_create: could not open connection for %s\n",
308 nconf->nc_netid);
309 return (NULL);
310 }
311 __rpc_nconf2sockinfo(nconf, &si);
312 madeso = TRUE;
313 } else {
314 /*
315 * It is an open socket. Get the transport info.
316 */
317 if (!__rpc_socket2sockinfo(so, &si)) {
318 printf(
319 "svc_tli_create: could not get transport information\n");
320 return (NULL);
321 }
322 }
323
324 /*
325 * If the socket is unbound, try to bind it.
326 */
327 if (madeso || !__rpc_sockisbound(so)) {
328 if (bindaddr == NULL) {
329 if (bindresvport(so, NULL)) {
330 memset(&ss, 0, sizeof ss);
331 ss.ss_family = si.si_af;
332 ss.ss_len = si.si_alen;
333 if (sobind(so, (struct sockaddr *)&ss,
334 curthread)) {
335 printf(
336 "svc_tli_create: could not bind to anonymous port\n");
337 goto freedata;
338 }
339 }
340 solisten(so, SOMAXCONN, curthread);
341 } else {
342 if (bindresvport(so,
343 (struct sockaddr *)bindaddr->addr.buf)) {
344 printf(
345 "svc_tli_create: could not bind to requested address\n");
346 goto freedata;
347 }
348 solisten(so, (int)bindaddr->qlen, curthread);
349 }
350
351 }
352 /*
353 * call transport specific function.
354 */
355 switch (si.si_socktype) {
356 case SOCK_STREAM:
357 #if 0
358 slen = sizeof ss;
359 if (_getpeername(fd, (struct sockaddr *)(void *)&ss, &slen)
360 == 0) {
361 /* accepted socket */
362 xprt = svc_fd_create(fd, sendsz, recvsz);
363 } else
364 #endif
365 xprt = svc_vc_create(pool, so, sendsz, recvsz);
366 if (!nconf || !xprt)
367 break;
368 #if 0
369 /* XXX fvdl */
370 if (strcmp(nconf->nc_protofmly, "inet") == 0 ||
371 strcmp(nconf->nc_protofmly, "inet6") == 0)
372 (void) __svc_vc_setflag(xprt, TRUE);
373 #endif
374 break;
375 case SOCK_DGRAM:
376 xprt = svc_dg_create(pool, so, sendsz, recvsz);
377 break;
378 default:
379 printf("svc_tli_create: bad service type");
380 goto freedata;
381 }
382
383 if (xprt == NULL)
384 /*
385 * The error messages here are spitted out by the lower layers:
386 * svc_vc_create(), svc_fd_create() and svc_dg_create().
387 */
388 goto freedata;
389
390 /* Fill in type of service */
391 xprt->xp_type = __rpc_socktype2seman(si.si_socktype);
392
393 if (nconf) {
394 xprt->xp_netid = strdup(nconf->nc_netid, M_RPC);
395 }
396 return (xprt);
397
398 freedata:
399 if (madeso)
400 (void)soclose(so);
401 if (xprt) {
402 if (!madeso) /* so that svc_destroy doesnt close fd */
403 xprt->xp_socket = NULL;
404 SVC_DESTROY(xprt);
405 }
406 return (NULL);
407 }
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