2 * Provide a variety of APIs that query an rpcbind daemon to
3 * discover RPC service ports and allowed protocol version
6 * Copyright (C) 2008 Oracle Corporation. All rights reserved.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public
19 * License along with this program; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 021110-1307, USA.
29 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <netinet/in.h>
38 #include <arpa/inet.h>
41 #include <rpc/pmap_prot.h>
44 #include <netconfig.h>
45 #include <rpc/rpcb_prot.h>
51 * Try a local socket first to access the local rpcbind daemon
53 * Rpcbind's local socket service does not seem to be working.
54 * Disable this logic for now.
58 #else /* !HAVE_LIBTIRPC */
60 #endif /* !HAVE_LIBTIRPC */
63 static const rpcvers_t default_rpcb_version = RPCBVERS_4;
64 #else /* !HAVE_LIBTIRPC */
65 static const rpcvers_t default_rpcb_version = PMAPVERS;
66 #endif /* !HAVE_LIBTIRPC */
69 * There's no easy way to tell how the local system's networking
70 * and rpcbind is configured (ie. whether we want to use IPv6 or
71 * IPv4 loopback to contact RPC services on the local host). We
72 * punt and simply try to look up "localhost".
74 * Returns TRUE on success.
76 static int nfs_gp_loopback_address(struct sockaddr *sap, socklen_t *salen)
78 struct addrinfo *gai_results;
81 if (getaddrinfo("localhost", NULL, NULL, &gai_results))
84 if (*salen >= gai_results->ai_addrlen) {
85 memcpy(sap, gai_results->ai_addr,
86 gai_results->ai_addrlen);
87 *salen = gai_results->ai_addrlen;
91 freeaddrinfo(gai_results);
96 * Plant port number in @sap. @port is already in network byte order.
98 static void nfs_gp_set_port(struct sockaddr *sap, const in_port_t port)
100 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
101 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
103 switch (sap->sa_family) {
105 sin->sin_port = port;
108 sin6->sin6_port = port;
114 * Look up a network service in /etc/services and return the
115 * network-order port number of that service.
117 static in_port_t nfs_gp_getservbyname(const char *service,
118 const unsigned short protocol)
120 const struct addrinfo gai_hint = {
121 .ai_family = AF_INET,
122 .ai_protocol = protocol,
123 .ai_flags = AI_PASSIVE,
125 struct addrinfo *gai_results;
126 const struct sockaddr_in *sin;
129 if (getaddrinfo(NULL, service, &gai_hint, &gai_results) != 0)
132 sin = (const struct sockaddr_in *)gai_results->ai_addr;
133 port = sin->sin_port;
135 freeaddrinfo(gai_results);
140 * Discover the port number that should be used to contact an
141 * rpcbind service. This will detect if the port has a local
142 * value that may have been set in /etc/services.
144 * Returns network byte-order port number of rpcbind service
147 static in_port_t nfs_gp_get_rpcb_port(const unsigned short protocol)
149 static const char *rpcb_netnametbl[] = {
157 for (i = 0; rpcb_netnametbl[i] != NULL; i++) {
160 port = nfs_gp_getservbyname(rpcb_netnametbl[i], protocol);
165 return (in_port_t)htons((uint16_t)PMAPPORT);
169 * Set up an RPC client for communicating with an rpcbind daemon at
170 * @sap over @transport with protocol version @version.
172 * Returns a pointer to a prepared RPC client if successful, and
173 * @timeout is initialized; caller must destroy a non-NULL returned RPC
174 * client. Otherwise returns NULL, and rpc_createerr.cf_stat is set to
177 static CLIENT *nfs_gp_get_rpcbclient(struct sockaddr *sap,
178 const socklen_t salen,
179 const unsigned short transport,
180 const rpcvers_t version,
181 struct timeval *timeout)
183 static const char *rpcb_pgmtbl[] = {
190 rpcprog_t rpcb_prog = nfs_getrpcbyname(RPCBPROG, rpcb_pgmtbl);
192 nfs_gp_set_port(sap, nfs_gp_get_rpcb_port(transport));
193 return nfs_get_rpcclient(sap, salen, transport, rpcb_prog,
198 * One of the arguments passed when querying remote rpcbind services
199 * via rpcbind v3 or v4 is a netid string. This replaces the pm_prot
200 * field used in legacy PMAP_GETPORT calls.
202 * RFC 1833 says netids are not standard but rather defined on the local
203 * host. There are, however, standard definitions for nc_protofmly and
204 * nc_proto that can be used to derive a netid string on the local host,
205 * based on the contents of /etc/netconfig.
207 * Walk through the local netconfig database and grab the netid of the
208 * first entry that matches @family and @protocol and whose netid string
209 * fits in the provided buffer.
211 * Returns a '\0'-terminated string if successful; otherwise NULL.
212 * rpc_createerr.cf_stat is set to reflect the error.
216 static char *nfs_gp_get_netid(const sa_family_t family,
217 const unsigned short protocol)
219 char *nc_protofmly, *nc_proto, *nc_netid;
220 struct netconfig *nconf;
221 struct protoent *proto;
227 nc_protofmly = NC_INET;
230 nc_protofmly = NC_INET6;
236 proto = getprotobynumber(protocol);
239 nc_proto = proto->p_name;
241 handle = setnetconfig();
242 while ((nconf = getnetconfig(handle)) != NULL) {
244 if (nconf->nc_protofmly != NULL &&
245 strcmp(nconf->nc_protofmly, nc_protofmly) != 0)
247 if (nconf->nc_proto != NULL &&
248 strcmp(nconf->nc_proto, nc_proto) != 0)
251 nc_netid = strdup(nconf->nc_netid);
252 endnetconfig(handle);
255 endnetconfig(handle);
258 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
262 #endif /* HAVE_LIBTIRPC */
265 * Extract a port number from a universal address, and terminate the
266 * string in @addrstr just after the address part.
268 * Returns -1 if unsuccesful; otherwise a decoded port number (possibly 0)
271 static int nfs_gp_universal_porthelper(char *addrstr)
274 unsigned long portlo, porthi;
277 p = strrchr(addrstr, '.');
280 portlo = strtoul(p + 1, &endptr, 10);
281 if (*endptr != '\0' || portlo > 255)
285 p = strrchr(addrstr, '.');
288 porthi = strtoul(p + 1, &endptr, 10);
289 if (*endptr != '\0' || porthi > 255)
292 port = (porthi << 8) | portlo;
299 * nfs_universal2port - extract port number from a "universal address"
300 * @uaddr: '\0'-terminated C string containing a universal address
302 * Universal addresses (defined in RFC 1833) are used when calling an
303 * rpcbind daemon via protocol versions 3 or 4..
305 * Returns -1 if unsuccesful; otherwise a decoded port number (possibly 0)
308 int nfs_universal2port(const char *uaddr)
313 addrstr = strdup(uaddr);
314 if (addrstr != NULL) {
315 port = nfs_gp_universal_porthelper(addrstr);
322 * nfs_sockaddr2universal - convert a sockaddr to a "universal address"
323 * @sap: pointer to a socket address
325 * Universal addresses (defined in RFC 1833) are used when calling an
326 * rpcbind daemon via protocol versions 3 or 4..
328 * Returns a '\0'-terminated string if successful; caller must free
329 * the returned string. Otherwise NULL is returned and
330 * rpc_createerr.cf_stat is set to reflect the error.
332 * inet_ntop(3) is used here, since getnameinfo(3) is not available
333 * in some earlier glibc releases, and we don't require support for
334 * scope IDs for universal addresses.
336 char *nfs_sockaddr2universal(const struct sockaddr *sap)
338 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
339 const struct sockaddr_un *sun = (const struct sockaddr_un *)sap;
340 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
341 char buf[INET6_ADDRSTRLEN + 8 /* for port information */];
347 switch (sap->sa_family) {
349 return strndup(sun->sun_path, sizeof(sun->sun_path));
351 if (inet_ntop(AF_INET, (const void *)&sin->sin_addr.s_addr,
352 buf, (socklen_t)sizeof(buf)) == NULL)
354 port = ntohs(sin->sin_port);
357 if (inet_ntop(AF_INET6, (const void *)&sin6->sin6_addr,
358 buf, (socklen_t)sizeof(buf)) == NULL)
360 port = ntohs(sin6->sin6_port);
366 count = sizeof(buf) - strlen(buf);
367 len = snprintf(buf + strlen(buf), count, ".%u.%u",
368 (unsigned)(port >> 8), (unsigned)(port & 0xff));
369 /* before glibc 2.0.6, snprintf(3) could return -1 */
370 if (len < 0 || (size_t)len > count)
373 result = strdup(buf);
378 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
383 * Send a NULL request to the indicated RPC service.
385 * Returns 1 if the service responded; otherwise 0;
387 static int nfs_gp_ping(CLIENT *client, struct timeval timeout)
389 enum clnt_stat status;
391 status = CLNT_CALL(client, NULLPROC,
392 (xdrproc_t)xdr_void, NULL,
393 (xdrproc_t)xdr_void, NULL,
396 return (int)(status == RPC_SUCCESS);
402 * Initialize the rpcb argument for a GETADDR request.
404 * Returns 1 if successful, and caller must free strings pointed
405 * to by r_netid and r_addr; otherwise 0.
407 static int nfs_gp_init_rpcb_parms(const struct sockaddr *sap,
408 const rpcprog_t program,
409 const rpcvers_t version,
410 const unsigned short protocol,
415 netid = nfs_gp_get_netid(sap->sa_family, protocol);
419 addr = nfs_sockaddr2universal(sap);
425 memset(parms, 0, sizeof(*parms));
426 parms->r_prog = program;
427 parms->r_vers = version;
428 parms->r_netid = netid;
429 parms->r_addr = addr;
435 static void nfs_gp_free_rpcb_parms(struct rpcb *parms)
437 free(parms->r_netid);
442 * Try rpcbind GETADDR via version 4. If that fails, try same
443 * request via version 3.
445 * Returns non-zero port number on success; otherwise returns
446 * zero. rpccreateerr is set to reflect the nature of the error.
448 static unsigned short nfs_gp_rpcb_getaddr(CLIENT *client,
450 struct timeval timeout)
452 rpcvers_t rpcb_version;
453 struct rpc_err rpcerr;
456 for (rpcb_version = RPCBVERS_4;
457 rpcb_version >= RPCBVERS_3;
459 enum clnt_stat status;
462 CLNT_CONTROL(client, CLSET_VERS, (void *)&rpcb_version);
463 status = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
464 (xdrproc_t)xdr_rpcb, (void *)parms,
465 (xdrproc_t)xdr_wrapstring, (void *)&uaddr,
470 if ((uaddr == NULL) || (uaddr[0] == '\0')) {
471 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
475 port = nfs_universal2port(uaddr);
476 xdr_free((xdrproc_t)xdr_wrapstring, (char *)&uaddr);
478 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
481 return (unsigned short)port;
482 case RPC_PROGVERSMISMATCH:
483 clnt_geterr(client, &rpcerr);
484 if (rpcerr.re_vers.low > RPCBVERS4)
487 case RPC_PROCUNAVAIL:
488 case RPC_PROGUNAVAIL:
491 /* Most likely RPC_TIMEDOUT or RPC_CANTRECV */
492 rpc_createerr.cf_stat = status;
493 clnt_geterr(client, &rpc_createerr.cf_error);
500 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
501 clnt_geterr(client, &rpc_createerr.cf_error);
506 #endif /* HAVE_LIBTIRPC */
509 * Try GETPORT request via rpcbind version 2.
511 * Returns non-zero port number on success; otherwise returns
512 * zero. rpccreateerr is set to reflect the nature of the error.
514 static unsigned long nfs_gp_pmap_getport(CLIENT *client,
516 struct timeval timeout)
518 enum clnt_stat status;
521 status = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
522 (xdrproc_t)xdr_pmap, (void *)parms,
523 (xdrproc_t)xdr_u_long, (void *)&port,
526 if (status != RPC_SUCCESS) {
527 rpc_createerr.cf_stat = status;
528 clnt_geterr(client, &rpc_createerr.cf_error);
530 } else if (port == 0)
531 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
538 static unsigned short nfs_gp_getport_rpcb(CLIENT *client,
539 const struct sockaddr *sap,
540 const rpcprog_t program,
541 const rpcvers_t version,
542 const unsigned short protocol,
543 struct timeval timeout)
545 unsigned short port = 0;
548 if (nfs_gp_init_rpcb_parms(sap, program, version,
549 protocol, &parms) != 0) {
550 port = nfs_gp_rpcb_getaddr(client, &parms, timeout);
551 nfs_gp_free_rpcb_parms(&parms);
557 #endif /* HAVE_LIBTIRPC */
559 static unsigned long nfs_gp_getport_pmap(CLIENT *client,
560 const rpcprog_t program,
561 const rpcvers_t version,
562 const unsigned short protocol,
563 struct timeval timeout)
565 struct pmap parms = {
570 rpcvers_t pmap_version = PMAPVERS;
572 CLNT_CONTROL(client, CLSET_VERS, (void *)&pmap_version);
573 return nfs_gp_pmap_getport(client, &parms, timeout);
577 * Try an AF_INET6 request via rpcbind v4/v3; try an AF_INET
578 * request via rpcbind v2.
580 * Returns non-zero port number on success; otherwise returns
581 * zero. rpccreateerr is set to reflect the nature of the error.
583 static unsigned short nfs_gp_getport(CLIENT *client,
584 const struct sockaddr *sap,
585 const rpcprog_t program,
586 const rpcvers_t version,
587 const unsigned short protocol,
588 struct timeval timeout)
590 switch (sap->sa_family) {
593 return nfs_gp_getport_rpcb(client, sap, program,
594 version, protocol, timeout);
595 #endif /* HAVE_LIBTIRPC */
597 return nfs_gp_getport_pmap(client, program, version,
601 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
606 * nfs_rpc_ping - Determine if RPC service is responding to requests
607 * @sap: pointer to address of server to query (port is already filled in)
608 * @salen: length of server address
609 * @program: requested RPC program number
610 * @version: requested RPC version number
611 * @protocol: requested IPPROTO_ value of transport protocol
612 * @timeout: pointer to request timeout (NULL means use default timeout)
614 * Returns 1 if the remote service responded without an error; otherwise
617 int nfs_rpc_ping(const struct sockaddr *sap, const socklen_t salen,
618 const rpcprog_t program, const rpcvers_t version,
619 const unsigned short protocol, const struct timeval *timeout)
621 struct sockaddr_storage address;
622 struct sockaddr *saddr = (struct sockaddr *)&address;
624 struct timeval tout = { -1, 0 };
630 memcpy(saddr, sap, (size_t)salen);
631 client = nfs_get_rpcclient(saddr, salen, protocol,
632 program, version, &tout);
633 if (client != NULL) {
634 result = nfs_gp_ping(client, tout);
635 CLNT_DESTROY(client);
642 * nfs_getport - query server's rpcbind to get port number for an RPC service
643 * @sap: pointer to address of server to query
644 * @salen: length of server's address
645 * @program: requested RPC program number
646 * @version: requested RPC version number
647 * @protocol: IPPROTO_ value of requested transport protocol
649 * Uses any acceptable rpcbind version to discover the port number for the
650 * RPC service described by the given [program, version, transport] tuple.
651 * Uses a quick timeout and an ephemeral source port. Supports AF_INET and
652 * AF_INET6 server addresses.
654 * Returns a positive integer representing the port number of the RPC
655 * service advertised by the server (in host byte order), or zero if the
656 * service is not advertised or there was some problem querying the server's
657 * rpcbind daemon. rpccreateerr is set to reflect the underlying cause of
660 * There are a variety of ways to choose which transport and rpcbind versions
661 * to use. We chose to conserve local resources and try to avoid incurring
665 * To provide rudimentary support for traversing firewalls, query the remote
666 * using the same transport as the requested service. This provides some
667 * guarantee that the requested transport is available between this client
668 * and the server, and if the caller specifically requests TCP, for example,
669 * this may be becuase a firewall is in place that blocks UDP traffic. We
670 * could try both, but that could involve a lengthy timeout in several cases,
671 * and would often consume an extra ephemeral port.
674 * To avoid using up too many ephemeral ports, AF_INET queries use tried-and-
675 * true rpcbindv2, and don't try the newer versions; and AF_INET6 queries use
676 * rpcbindv4, then rpcbindv3 on the same socket. The newer rpcbind protocol
677 * versions can adequately detect if a remote RPC service does not support
678 * AF_INET6 at all. The rpcbind socket is re-used in an attempt to keep the
679 * overall number of consumed ephemeral ports low.
681 unsigned short nfs_getport(const struct sockaddr *sap,
682 const socklen_t salen,
683 const rpcprog_t program,
684 const rpcvers_t version,
685 const unsigned short protocol)
687 struct sockaddr_storage address;
688 struct sockaddr *saddr = (struct sockaddr *)&address;
689 struct timeval timeout = { -1, 0 };
690 unsigned short port = 0;
693 memcpy(saddr, sap, (size_t)salen);
694 client = nfs_gp_get_rpcbclient(saddr, salen, protocol,
695 default_rpcb_version, &timeout);
696 if (client != NULL) {
697 port = nfs_gp_getport(client, saddr, program,
698 version, protocol, timeout);
699 CLNT_DESTROY(client);
706 * nfs_getport_ping - query server's rpcbind and do RPC ping to verify result
707 * @sap: IN: pointer to address of server to query;
708 * OUT: pointer to updated address
709 * @salen: length of server's address
710 * @program: requested RPC program number
711 * @version: requested RPC version number
712 * @protocol: IPPROTO_ value of requested transport protocol
714 * Uses any acceptable rpcbind version to discover the port number for the
715 * RPC service described by the given [program, version, transport] tuple.
716 * Uses a quick timeout and an ephemeral source port. Supports AF_INET and
717 * AF_INET6 server addresses.
719 * Returns a 1 and sets the port number in the passed-in server address
720 * if both the query and the ping were successful; otherwise zero.
721 * rpccreateerr is set to reflect the underlying cause of the error.
723 int nfs_getport_ping(struct sockaddr *sap, const socklen_t salen,
724 const rpcprog_t program, const rpcvers_t version,
725 const unsigned short protocol)
727 struct timeval timeout = { -1, 0 };
728 unsigned short port = 0;
732 client = nfs_gp_get_rpcbclient(sap, salen, protocol,
733 default_rpcb_version, &timeout);
734 if (client != NULL) {
735 port = nfs_gp_getport(client, sap, program,
736 version, protocol, timeout);
737 CLNT_DESTROY(client);
742 struct sockaddr_storage address;
743 struct sockaddr *saddr = (struct sockaddr *)&address;
745 memcpy(saddr, sap, (size_t)salen);
746 nfs_gp_set_port(saddr, htons(port));
748 client = nfs_get_rpcclient(saddr, salen, protocol,
749 program, version, &timeout);
750 if (client != NULL) {
751 result = nfs_gp_ping(client, timeout);
752 CLNT_DESTROY(client);
757 nfs_gp_set_port(sap, htons(port));
763 * nfs_getlocalport - query local rpcbind to get port number for an RPC service
764 * @program: requested RPC program number
765 * @version: requested RPC version number
766 * @protocol: IPPROTO_ value of requested transport protocol
768 * Uses any acceptable rpcbind version to discover the port number for the
769 * RPC service described by the given [program, version, transport] tuple.
770 * Uses a quick timeout and an ephemeral source port. Supports AF_INET and
771 * AF_INET6 local addresses.
773 * Returns a positive integer representing the port number of the RPC
774 * service advertised by the server (in host byte order), or zero if the
775 * service is not advertised or there was some problem querying the server's
776 * rpcbind daemon. rpccreateerr is set to reflect the underlying cause of
779 * Try an AF_LOCAL connection first. The rpcbind daemon implementation should
780 * listen on AF_LOCAL.
782 * If that doesn't work (for example, if portmapper is running, or rpcbind
783 * isn't listening on /var/run/rpcbind.sock), send a query via UDP to localhost
784 * (UDP doesn't leave a socket in TIME_WAIT, and the timeout is a relatively
787 unsigned short nfs_getlocalport(const rpcprot_t program,
788 const rpcvers_t version,
789 const unsigned short protocol)
791 struct sockaddr_storage address;
792 struct sockaddr *lb_addr = (struct sockaddr *)&address;
793 socklen_t lb_len = sizeof(*lb_addr);
794 unsigned short port = 0;
797 const struct sockaddr_un sun = {
798 .sun_family = AF_LOCAL,
799 .sun_path = _PATH_RPCBINDSOCK,
801 const struct sockaddr *sap = (struct sockaddr *)&sun;
802 const socklen_t salen = SUN_LEN(&sun);
804 struct timeval timeout = { -1, 0 };
806 client = nfs_gp_get_rpcbclient(sap, salen, 0, RPCBVERS_4, &timeout);
807 if (client != NULL) {
810 if (nfs_gp_init_rpcb_parms(sap, program, version,
811 protocol, &parms) != 0) {
812 port = nfs_gp_rpcb_getaddr(client, &parms, timeout);
813 nfs_gp_free_rpcb_parms(&parms);
815 CLNT_DESTROY(client);
817 #endif /* NFS_GP_LOCAL */
820 if (nfs_gp_loopback_address(lb_addr, &lb_len)) {
821 port = nfs_getport(lb_addr, lb_len,
822 program, version, protocol);
824 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
831 * nfs_rpcb_getaddr - query rpcbind via rpcbind versions 4 and 3
832 * @sap: pointer to address of server to query
833 * @salen: length of server address
834 * @transport: transport protocol to use for the query
835 * @addr: pointer to r_addr address
836 * @program: requested RPC program number
837 * @version: requested RPC version number
838 * @protocol: requested IPPROTO_ value of transport protocol
839 * @timeout: pointer to request timeout (NULL means use default timeout)
841 * Returns a positive integer representing the port number of the RPC
842 * service advertised by the server (in host byte order), or zero if the
843 * service is not advertised or there was some problem querying the
844 * server's rpcbind daemon. rpccreateerr is set to reflect the
845 * underlying cause of the error.
847 * This function provides similar functionality to nfs_pmap_getport(),
848 * but performs the rpcbind lookup via rpcbind version 4. If the server
849 * doesn't support rpcbind version 4, it will retry with version 3.
850 * The GETADDR procedure is exactly the same in these two versions of
851 * the rpcbind protocol, so the socket, RPC client, and arguments are
852 * re-used when retrying, saving ephemeral port space.
854 * These RPC procedures take a universal address as an argument, so the
855 * query will fail if the remote rpcbind daemon doesn't find an entry
856 * with a matching address. A matching address includes an ANYADDR
857 * address of the same address family. In this way an RPC server can
858 * advertise via rpcbind that it does not support AF_INET6.
862 unsigned short nfs_rpcb_getaddr(const struct sockaddr *sap,
863 const socklen_t salen,
864 const unsigned short transport,
865 const struct sockaddr *addr,
866 const rpcprog_t program,
867 const rpcvers_t version,
868 const unsigned short protocol,
869 const struct timeval *timeout)
871 struct sockaddr_storage address;
872 struct sockaddr *saddr = (struct sockaddr *)&address;
875 struct timeval tout = { -1, 0 };
876 unsigned short port = 0;
881 memcpy(saddr, sap, (size_t)salen);
882 client = nfs_gp_get_rpcbclient(saddr, salen, transport,
884 if (client != NULL) {
885 if (nfs_gp_init_rpcb_parms(addr, program, version,
886 protocol, &parms) != 0) {
887 port = nfs_gp_rpcb_getaddr(client, &parms, tout);
888 nfs_gp_free_rpcb_parms(&parms);
890 CLNT_DESTROY(client);
896 #else /* !HAVE_LIBTIRPC */
898 unsigned short nfs_rpcb_getaddr(__attribute__((unused)) const struct sockaddr *sap,
899 __attribute__((unused)) const socklen_t salen,
900 __attribute__((unused)) const unsigned short transport,
901 __attribute__((unused)) const struct sockaddr *addr,
902 __attribute__((unused)) const rpcprog_t program,
903 __attribute__((unused)) const rpcvers_t version,
904 __attribute__((unused)) const unsigned short protocol,
905 __attribute__((unused)) const struct timeval *timeout)
907 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
911 #endif /* !HAVE_LIBTIRPC */
914 * nfs_pmap_getport - query rpcbind via the portmap protocol (rpcbindv2)
915 * @sin: pointer to AF_INET address of server to query
916 * @transport: transport protocol to use for the query
917 * @program: requested RPC program number
918 * @version: requested RPC version number
919 * @protocol: requested IPPROTO_ value of transport protocol
920 * @timeout: pointer to request timeout (NULL means use default timeout)
922 * Returns a positive integer representing the port number of the RPC service
923 * advertised by the server (in host byte order), or zero if the service is
924 * not advertised or there was some problem querying the server's rpcbind
925 * daemon. rpccreateerr is set to reflect the underlying cause of the error.
927 * nfs_pmap_getport() is very similar to pmap_getport(), except that:
929 * 1. This version always tries to use an ephemeral port, since reserved
930 * ports are not needed for GETPORT queries. This conserves the very
931 * limited reserved port space, helping reduce failed socket binds
932 * during mount storms.
934 * 2. This version times out quickly by default. It time-limits the
935 * connect process as well as the actual RPC call, and even allows the
936 * caller to specify the timeout.
938 * 3. This version shares code with the rpcbindv3 and rpcbindv4 query
939 * functions. It can use a TI-RPC generated CLIENT.
941 unsigned long nfs_pmap_getport(const struct sockaddr_in *sin,
942 const unsigned short transport,
943 const unsigned long program,
944 const unsigned long version,
945 const unsigned long protocol,
946 const struct timeval *timeout)
948 struct sockaddr_in address;
949 struct sockaddr *saddr = (struct sockaddr *)&address;
951 struct pmap parms = {
956 struct timeval tout = { -1, 0 };
957 unsigned long port = 0;
962 memcpy(saddr, sin, sizeof(address));
963 client = nfs_gp_get_rpcbclient(saddr, (socklen_t)sizeof(*sin),
964 transport, PMAPVERS, &tout);
965 if (client != NULL) {
966 port = nfs_gp_pmap_getport(client, &parms, tout);
967 CLNT_DESTROY(client);