FreeBSD/Linux Kernel Cross Reference
sys/rpc/rpc_generic.c
1 /* $NetBSD: rpc_generic.c,v 1.4 2000/09/28 09:07:04 kleink 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 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
33 */
34
35 /* #pragma ident "@(#)rpc_generic.c 1.17 94/04/24 SMI" */
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: src/sys/rpc/rpc_generic.c,v 1.4 2008/11/03 10:38:00 dfr Exp $");
38
39 /*
40 * rpc_generic.c, Miscl routines for RPC.
41 *
42 */
43
44 #include "opt_inet6.h"
45
46 #include <sys/param.h>
47 #include <sys/kernel.h>
48 #include <sys/malloc.h>
49 #include <sys/mbuf.h>
50 #include <sys/module.h>
51 #include <sys/proc.h>
52 #include <sys/protosw.h>
53 #include <sys/sbuf.h>
54 #include <sys/systm.h>
55 #include <sys/socket.h>
56 #include <sys/socketvar.h>
57 #include <sys/syslog.h>
58
59 #include <rpc/rpc.h>
60 #include <rpc/nettype.h>
61
62 #include <rpc/rpc_com.h>
63
64 #if __FreeBSD_version < 700000
65 #define strrchr rindex
66 #endif
67
68 struct handle {
69 NCONF_HANDLE *nhandle;
70 int nflag; /* Whether NETPATH or NETCONFIG */
71 int nettype;
72 };
73
74 static const struct _rpcnettype {
75 const char *name;
76 const int type;
77 } _rpctypelist[] = {
78 { "netpath", _RPC_NETPATH },
79 { "visible", _RPC_VISIBLE },
80 { "circuit_v", _RPC_CIRCUIT_V },
81 { "datagram_v", _RPC_DATAGRAM_V },
82 { "circuit_n", _RPC_CIRCUIT_N },
83 { "datagram_n", _RPC_DATAGRAM_N },
84 { "tcp", _RPC_TCP },
85 { "udp", _RPC_UDP },
86 { 0, _RPC_NONE }
87 };
88
89 struct netid_af {
90 const char *netid;
91 int af;
92 int protocol;
93 };
94
95 static const struct netid_af na_cvt[] = {
96 { "udp", AF_INET, IPPROTO_UDP },
97 { "tcp", AF_INET, IPPROTO_TCP },
98 #ifdef INET6
99 { "udp6", AF_INET6, IPPROTO_UDP },
100 { "tcp6", AF_INET6, IPPROTO_TCP },
101 #endif
102 { "local", AF_LOCAL, 0 }
103 };
104
105 struct rpc_createerr rpc_createerr;
106
107 /*
108 * Find the appropriate buffer size
109 */
110 u_int
111 /*ARGSUSED*/
112 __rpc_get_t_size(int af, int proto, int size)
113 {
114 int maxsize, defsize;
115
116 maxsize = 256 * 1024; /* XXX */
117 switch (proto) {
118 case IPPROTO_TCP:
119 defsize = 64 * 1024; /* XXX */
120 break;
121 case IPPROTO_UDP:
122 defsize = UDPMSGSIZE;
123 break;
124 default:
125 defsize = RPC_MAXDATASIZE;
126 break;
127 }
128 if (size == 0)
129 return defsize;
130
131 /* Check whether the value is within the upper max limit */
132 return (size > maxsize ? (u_int)maxsize : (u_int)size);
133 }
134
135 /*
136 * Find the appropriate address buffer size
137 */
138 u_int
139 __rpc_get_a_size(af)
140 int af;
141 {
142 switch (af) {
143 case AF_INET:
144 return sizeof (struct sockaddr_in);
145 #ifdef INET6
146 case AF_INET6:
147 return sizeof (struct sockaddr_in6);
148 #endif
149 case AF_LOCAL:
150 return sizeof (struct sockaddr_un);
151 default:
152 break;
153 }
154 return ((u_int)RPC_MAXADDRSIZE);
155 }
156
157 #if 0
158
159 /*
160 * Used to ping the NULL procedure for clnt handle.
161 * Returns NULL if fails, else a non-NULL pointer.
162 */
163 void *
164 rpc_nullproc(clnt)
165 CLIENT *clnt;
166 {
167 struct timeval TIMEOUT = {25, 0};
168
169 if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
170 (xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
171 return (NULL);
172 }
173 return ((void *) clnt);
174 }
175
176 #endif
177
178 int
179 __rpc_socket2sockinfo(struct socket *so, struct __rpc_sockinfo *sip)
180 {
181 int type, proto;
182 struct sockaddr *sa;
183 sa_family_t family;
184 struct sockopt opt;
185 int error;
186
187 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
188 if (error)
189 return 0;
190
191 sip->si_alen = sa->sa_len;
192 family = sa->sa_family;
193 free(sa, M_SONAME);
194
195 opt.sopt_dir = SOPT_GET;
196 opt.sopt_level = SOL_SOCKET;
197 opt.sopt_name = SO_TYPE;
198 opt.sopt_val = &type;
199 opt.sopt_valsize = sizeof type;
200 opt.sopt_td = NULL;
201 error = sogetopt(so, &opt);
202 if (error)
203 return 0;
204
205 /* XXX */
206 if (family != AF_LOCAL) {
207 if (type == SOCK_STREAM)
208 proto = IPPROTO_TCP;
209 else if (type == SOCK_DGRAM)
210 proto = IPPROTO_UDP;
211 else
212 return 0;
213 } else
214 proto = 0;
215
216 sip->si_af = family;
217 sip->si_proto = proto;
218 sip->si_socktype = type;
219
220 return 1;
221 }
222
223 /*
224 * Linear search, but the number of entries is small.
225 */
226 int
227 __rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
228 {
229 int i;
230
231 for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
232 if (strcmp(na_cvt[i].netid, nconf->nc_netid) == 0 || (
233 strcmp(nconf->nc_netid, "unix") == 0 &&
234 strcmp(na_cvt[i].netid, "local") == 0)) {
235 sip->si_af = na_cvt[i].af;
236 sip->si_proto = na_cvt[i].protocol;
237 sip->si_socktype =
238 __rpc_seman2socktype((int)nconf->nc_semantics);
239 if (sip->si_socktype == -1)
240 return 0;
241 sip->si_alen = __rpc_get_a_size(sip->si_af);
242 return 1;
243 }
244
245 return 0;
246 }
247
248 struct socket *
249 __rpc_nconf2socket(const struct netconfig *nconf)
250 {
251 struct __rpc_sockinfo si;
252 struct socket *so;
253 int error;
254
255 if (!__rpc_nconf2sockinfo(nconf, &si))
256 return 0;
257
258 so = NULL;
259 error = socreate(si.si_af, &so, si.si_socktype, si.si_proto,
260 curthread->td_ucred, curthread);
261
262 if (error)
263 return NULL;
264 else
265 return so;
266 }
267
268 char *
269 taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
270 {
271 struct __rpc_sockinfo si;
272
273 if (!__rpc_nconf2sockinfo(nconf, &si))
274 return NULL;
275 return __rpc_taddr2uaddr_af(si.si_af, nbuf);
276 }
277
278 struct netbuf *
279 uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
280 {
281 struct __rpc_sockinfo si;
282
283 if (!__rpc_nconf2sockinfo(nconf, &si))
284 return NULL;
285 return __rpc_uaddr2taddr_af(si.si_af, uaddr);
286 }
287
288 char *
289 __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
290 {
291 char *ret;
292 struct sbuf sb;
293 struct sockaddr_in *sin;
294 struct sockaddr_un *sun;
295 char namebuf[INET_ADDRSTRLEN];
296 #ifdef INET6
297 struct sockaddr_in6 *sin6;
298 char namebuf6[INET6_ADDRSTRLEN];
299 #endif
300 u_int16_t port;
301
302 sbuf_new(&sb, NULL, 0, SBUF_AUTOEXTEND);
303
304 switch (af) {
305 case AF_INET:
306 sin = nbuf->buf;
307 if (__rpc_inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
308 == NULL)
309 return NULL;
310 port = ntohs(sin->sin_port);
311 if (sbuf_printf(&sb, "%s.%u.%u", namebuf,
312 ((uint32_t)port) >> 8,
313 port & 0xff) < 0)
314 return NULL;
315 break;
316 #ifdef INET6
317 case AF_INET6:
318 sin6 = nbuf->buf;
319 if (__rpc_inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
320 == NULL)
321 return NULL;
322 port = ntohs(sin6->sin6_port);
323 if (sbuf_printf(&sb, "%s.%u.%u", namebuf6,
324 ((uint32_t)port) >> 8,
325 port & 0xff) < 0)
326 return NULL;
327 break;
328 #endif
329 case AF_LOCAL:
330 sun = nbuf->buf;
331 if (sbuf_printf(&sb, "%.*s", (int)(sun->sun_len -
332 offsetof(struct sockaddr_un, sun_path)),
333 sun->sun_path) < 0)
334 return (NULL);
335 break;
336 default:
337 return NULL;
338 }
339
340 sbuf_finish(&sb);
341 ret = strdup(sbuf_data(&sb), M_RPC);
342 sbuf_delete(&sb);
343
344 return ret;
345 }
346
347 struct netbuf *
348 __rpc_uaddr2taddr_af(int af, const char *uaddr)
349 {
350 struct netbuf *ret = NULL;
351 char *addrstr, *p;
352 unsigned port, portlo, porthi;
353 struct sockaddr_in *sin;
354 #ifdef INET6
355 struct sockaddr_in6 *sin6;
356 #endif
357 struct sockaddr_un *sun;
358
359 port = 0;
360 sin = NULL;
361 addrstr = strdup(uaddr, M_RPC);
362 if (addrstr == NULL)
363 return NULL;
364
365 /*
366 * AF_LOCAL addresses are expected to be absolute
367 * pathnames, anything else will be AF_INET or AF_INET6.
368 */
369 if (*addrstr != '/') {
370 p = strrchr(addrstr, '.');
371 if (p == NULL)
372 goto out;
373 portlo = (unsigned)strtol(p + 1, NULL, 10);
374 *p = '\0';
375
376 p = strrchr(addrstr, '.');
377 if (p == NULL)
378 goto out;
379 porthi = (unsigned)strtol(p + 1, NULL, 10);
380 *p = '\0';
381 port = (porthi << 8) | portlo;
382 }
383
384 ret = (struct netbuf *)malloc(sizeof *ret, M_RPC, M_WAITOK);
385 if (ret == NULL)
386 goto out;
387
388 switch (af) {
389 case AF_INET:
390 sin = (struct sockaddr_in *)malloc(sizeof *sin, M_RPC,
391 M_WAITOK);
392 if (sin == NULL)
393 goto out;
394 memset(sin, 0, sizeof *sin);
395 sin->sin_family = AF_INET;
396 sin->sin_port = htons(port);
397 if (__rpc_inet_pton(AF_INET, addrstr, &sin->sin_addr) <= 0) {
398 free(sin, M_RPC);
399 free(ret, M_RPC);
400 ret = NULL;
401 goto out;
402 }
403 sin->sin_len = ret->maxlen = ret->len = sizeof *sin;
404 ret->buf = sin;
405 break;
406 #ifdef INET6
407 case AF_INET6:
408 sin6 = (struct sockaddr_in6 *)malloc(sizeof *sin6, M_RPC,
409 M_WAITOK);
410 if (sin6 == NULL)
411 goto out;
412 memset(sin6, 0, sizeof *sin6);
413 sin6->sin6_family = AF_INET6;
414 sin6->sin6_port = htons(port);
415 if (__rpc_inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
416 free(sin6, M_RPC);
417 free(ret, M_RPC);
418 ret = NULL;
419 goto out;
420 }
421 sin6->sin6_len = ret->maxlen = ret->len = sizeof *sin6;
422 ret->buf = sin6;
423 break;
424 #endif
425 case AF_LOCAL:
426 sun = (struct sockaddr_un *)malloc(sizeof *sun, M_RPC,
427 M_WAITOK);
428 if (sun == NULL)
429 goto out;
430 memset(sun, 0, sizeof *sun);
431 sun->sun_family = AF_LOCAL;
432 strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
433 ret->len = ret->maxlen = sun->sun_len = SUN_LEN(sun);
434 ret->buf = sun;
435 break;
436 default:
437 break;
438 }
439 out:
440 free(addrstr, M_RPC);
441 return ret;
442 }
443
444 int
445 __rpc_seman2socktype(int semantics)
446 {
447 switch (semantics) {
448 case NC_TPI_CLTS:
449 return SOCK_DGRAM;
450 case NC_TPI_COTS_ORD:
451 return SOCK_STREAM;
452 case NC_TPI_RAW:
453 return SOCK_RAW;
454 default:
455 break;
456 }
457
458 return -1;
459 }
460
461 int
462 __rpc_socktype2seman(int socktype)
463 {
464 switch (socktype) {
465 case SOCK_DGRAM:
466 return NC_TPI_CLTS;
467 case SOCK_STREAM:
468 return NC_TPI_COTS_ORD;
469 case SOCK_RAW:
470 return NC_TPI_RAW;
471 default:
472 break;
473 }
474
475 return -1;
476 }
477
478 /*
479 * Returns the type of the network as defined in <rpc/nettype.h>
480 * If nettype is NULL, it defaults to NETPATH.
481 */
482 static int
483 getnettype(const char *nettype)
484 {
485 int i;
486
487 if ((nettype == NULL) || (nettype[0] == 0)) {
488 return (_RPC_NETPATH); /* Default */
489 }
490
491 #if 0
492 nettype = strlocase(nettype);
493 #endif
494 for (i = 0; _rpctypelist[i].name; i++)
495 if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
496 return (_rpctypelist[i].type);
497 }
498 return (_rpctypelist[i].type);
499 }
500
501 /*
502 * For the given nettype (tcp or udp only), return the first structure found.
503 * This should be freed by calling freenetconfigent()
504 */
505 struct netconfig *
506 __rpc_getconfip(const char *nettype)
507 {
508 char *netid;
509 static char *netid_tcp = (char *) NULL;
510 static char *netid_udp = (char *) NULL;
511 struct netconfig *dummy;
512
513 if (!netid_udp && !netid_tcp) {
514 struct netconfig *nconf;
515 void *confighandle;
516
517 if (!(confighandle = setnetconfig())) {
518 log(LOG_ERR, "rpc: failed to open " NETCONFIG);
519 return (NULL);
520 }
521 while ((nconf = getnetconfig(confighandle)) != NULL) {
522 if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
523 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
524 netid_tcp = strdup(nconf->nc_netid,
525 M_RPC);
526 } else
527 if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
528 netid_udp = strdup(nconf->nc_netid,
529 M_RPC);
530 }
531 }
532 }
533 endnetconfig(confighandle);
534 }
535 if (strcmp(nettype, "udp") == 0)
536 netid = netid_udp;
537 else if (strcmp(nettype, "tcp") == 0)
538 netid = netid_tcp;
539 else {
540 return (NULL);
541 }
542 if ((netid == NULL) || (netid[0] == 0)) {
543 return (NULL);
544 }
545 dummy = getnetconfigent(netid);
546 return (dummy);
547 }
548
549 /*
550 * Returns the type of the nettype, which should then be used with
551 * __rpc_getconf().
552 *
553 * For simplicity in the kernel, we don't support the NETPATH
554 * environment variable. We behave as userland would then NETPATH is
555 * unset, i.e. iterate over all visible entries in netconfig.
556 */
557 void *
558 __rpc_setconf(nettype)
559 const char *nettype;
560 {
561 struct handle *handle;
562
563 handle = (struct handle *) malloc(sizeof (struct handle),
564 M_RPC, M_WAITOK);
565 switch (handle->nettype = getnettype(nettype)) {
566 case _RPC_NETPATH:
567 case _RPC_CIRCUIT_N:
568 case _RPC_DATAGRAM_N:
569 if (!(handle->nhandle = setnetconfig()))
570 goto failed;
571 handle->nflag = TRUE;
572 break;
573 case _RPC_VISIBLE:
574 case _RPC_CIRCUIT_V:
575 case _RPC_DATAGRAM_V:
576 case _RPC_TCP:
577 case _RPC_UDP:
578 if (!(handle->nhandle = setnetconfig())) {
579 log(LOG_ERR, "rpc: failed to open " NETCONFIG);
580 goto failed;
581 }
582 handle->nflag = FALSE;
583 break;
584 default:
585 goto failed;
586 }
587
588 return (handle);
589
590 failed:
591 free(handle, M_RPC);
592 return (NULL);
593 }
594
595 /*
596 * Returns the next netconfig struct for the given "net" type.
597 * __rpc_setconf() should have been called previously.
598 */
599 struct netconfig *
600 __rpc_getconf(void *vhandle)
601 {
602 struct handle *handle;
603 struct netconfig *nconf;
604
605 handle = (struct handle *)vhandle;
606 if (handle == NULL) {
607 return (NULL);
608 }
609 for (;;) {
610 if (handle->nflag) {
611 nconf = getnetconfig(handle->nhandle);
612 if (nconf && !(nconf->nc_flag & NC_VISIBLE))
613 continue;
614 } else {
615 nconf = getnetconfig(handle->nhandle);
616 }
617 if (nconf == NULL)
618 break;
619 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
620 (nconf->nc_semantics != NC_TPI_COTS) &&
621 (nconf->nc_semantics != NC_TPI_COTS_ORD))
622 continue;
623 switch (handle->nettype) {
624 case _RPC_VISIBLE:
625 if (!(nconf->nc_flag & NC_VISIBLE))
626 continue;
627 /* FALLTHROUGH */
628 case _RPC_NETPATH: /* Be happy */
629 break;
630 case _RPC_CIRCUIT_V:
631 if (!(nconf->nc_flag & NC_VISIBLE))
632 continue;
633 /* FALLTHROUGH */
634 case _RPC_CIRCUIT_N:
635 if ((nconf->nc_semantics != NC_TPI_COTS) &&
636 (nconf->nc_semantics != NC_TPI_COTS_ORD))
637 continue;
638 break;
639 case _RPC_DATAGRAM_V:
640 if (!(nconf->nc_flag & NC_VISIBLE))
641 continue;
642 /* FALLTHROUGH */
643 case _RPC_DATAGRAM_N:
644 if (nconf->nc_semantics != NC_TPI_CLTS)
645 continue;
646 break;
647 case _RPC_TCP:
648 if (((nconf->nc_semantics != NC_TPI_COTS) &&
649 (nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
650 (strcmp(nconf->nc_protofmly, NC_INET)
651 #ifdef INET6
652 && strcmp(nconf->nc_protofmly, NC_INET6))
653 #else
654 )
655 #endif
656 ||
657 strcmp(nconf->nc_proto, NC_TCP))
658 continue;
659 break;
660 case _RPC_UDP:
661 if ((nconf->nc_semantics != NC_TPI_CLTS) ||
662 (strcmp(nconf->nc_protofmly, NC_INET)
663 #ifdef INET6
664 && strcmp(nconf->nc_protofmly, NC_INET6))
665 #else
666 )
667 #endif
668 ||
669 strcmp(nconf->nc_proto, NC_UDP))
670 continue;
671 break;
672 }
673 break;
674 }
675 return (nconf);
676 }
677
678 void
679 __rpc_endconf(vhandle)
680 void * vhandle;
681 {
682 struct handle *handle;
683
684 handle = (struct handle *) vhandle;
685 if (handle == NULL) {
686 return;
687 }
688 endnetconfig(handle->nhandle);
689 free(handle, M_RPC);
690 }
691
692 int
693 __rpc_sockisbound(struct socket *so)
694 {
695 struct sockaddr *sa;
696 int error, bound;
697
698 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
699 if (error)
700 return (0);
701
702 switch (sa->sa_family) {
703 case AF_INET:
704 bound = (((struct sockaddr_in *) sa)->sin_port != 0);
705 break;
706 #ifdef INET6
707 case AF_INET6:
708 bound = (((struct sockaddr_in6 *) sa)->sin6_port != 0);
709 break;
710 #endif
711 case AF_LOCAL:
712 /* XXX check this */
713 bound = (((struct sockaddr_un *) sa)->sun_path[0] != '\0');
714 break;
715 default:
716 bound = FALSE;
717 break;
718 }
719
720 free(sa, M_SONAME);
721
722 return bound;
723 }
724
725 /*
726 * Implement XDR-style API for RPC call.
727 */
728 enum clnt_stat
729 clnt_call_private(
730 CLIENT *cl, /* client handle */
731 struct rpc_callextra *ext, /* call metadata */
732 rpcproc_t proc, /* procedure number */
733 xdrproc_t xargs, /* xdr routine for args */
734 void *argsp, /* pointer to args */
735 xdrproc_t xresults, /* xdr routine for results */
736 void *resultsp, /* pointer to results */
737 struct timeval utimeout) /* seconds to wait before giving up */
738 {
739 XDR xdrs;
740 struct mbuf *mreq;
741 struct mbuf *mrep;
742 enum clnt_stat stat;
743
744 MGET(mreq, M_WAIT, MT_DATA);
745 MCLGET(mreq, M_WAIT);
746 mreq->m_len = 0;
747
748 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
749 if (!xargs(&xdrs, argsp)) {
750 m_freem(mreq);
751 return (RPC_CANTENCODEARGS);
752 }
753 XDR_DESTROY(&xdrs);
754
755 stat = CLNT_CALL_MBUF(cl, ext, proc, mreq, &mrep, utimeout);
756 m_freem(mreq);
757
758 if (stat == RPC_SUCCESS) {
759 xdrmbuf_create(&xdrs, mrep, XDR_DECODE);
760 if (!xresults(&xdrs, resultsp)) {
761 XDR_DESTROY(&xdrs);
762 return (RPC_CANTDECODERES);
763 }
764 XDR_DESTROY(&xdrs);
765 }
766
767 return (stat);
768 }
769
770 /*
771 * Bind a socket to a privileged IP port
772 */
773 int
774 bindresvport(struct socket *so, struct sockaddr *sa)
775 {
776 int old, error, af;
777 bool_t freesa = FALSE;
778 struct sockaddr_in *sin;
779 #ifdef INET6
780 struct sockaddr_in6 *sin6;
781 #endif
782 struct sockopt opt;
783 int proto, portrange, portlow;
784 u_int16_t *portp;
785 socklen_t salen;
786
787 if (sa == NULL) {
788 error = so->so_proto->pr_usrreqs->pru_sockaddr(so, &sa);
789 if (error)
790 return (error);
791 freesa = TRUE;
792 af = sa->sa_family;
793 salen = sa->sa_len;
794 memset(sa, 0, sa->sa_len);
795 } else {
796 af = sa->sa_family;
797 salen = sa->sa_len;
798 }
799
800 switch (af) {
801 case AF_INET:
802 proto = IPPROTO_IP;
803 portrange = IP_PORTRANGE;
804 portlow = IP_PORTRANGE_LOW;
805 sin = (struct sockaddr_in *)sa;
806 portp = &sin->sin_port;
807 break;
808 #ifdef INET6
809 case AF_INET6:
810 proto = IPPROTO_IPV6;
811 portrange = IPV6_PORTRANGE;
812 portlow = IPV6_PORTRANGE_LOW;
813 sin6 = (struct sockaddr_in6 *)sa;
814 portp = &sin6->sin6_port;
815 break;
816 #endif
817 default:
818 return (EPFNOSUPPORT);
819 }
820
821 sa->sa_family = af;
822 sa->sa_len = salen;
823
824 if (*portp == 0) {
825 bzero(&opt, sizeof(opt));
826 opt.sopt_dir = SOPT_GET;
827 opt.sopt_level = proto;
828 opt.sopt_name = portrange;
829 opt.sopt_val = &old;
830 opt.sopt_valsize = sizeof(old);
831 error = sogetopt(so, &opt);
832 if (error)
833 goto out;
834
835 opt.sopt_dir = SOPT_SET;
836 opt.sopt_val = &portlow;
837 error = sosetopt(so, &opt);
838 if (error)
839 goto out;
840 }
841
842 error = sobind(so, sa, curthread);
843
844 if (*portp == 0) {
845 if (error) {
846 opt.sopt_dir = SOPT_SET;
847 opt.sopt_val = &old;
848 sosetopt(so, &opt);
849 }
850 }
851 out:
852 if (freesa)
853 free(sa, M_SONAME);
854
855 return (error);
856 }
857
858 /*
859 * Kernel module glue
860 */
861 static int
862 krpc_modevent(module_t mod, int type, void *data)
863 {
864
865 return (0);
866 }
867 static moduledata_t krpc_mod = {
868 "krpc",
869 krpc_modevent,
870 NULL,
871 };
872 DECLARE_MODULE(krpc, krpc_mod, SI_SUB_VFS, SI_ORDER_ANY);
873
874 /* So that loader and kldload(2) can find us, wherever we are.. */
875 MODULE_VERSION(krpc, 1);
876
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