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
324 * @salen: length of socket address
326 * Universal addresses (defined in RFC 1833) are used when calling an
327 * rpcbind daemon via protocol versions 3 or 4..
329 * Returns a '\0'-terminated string if successful; caller must free
330 * the returned string. Otherwise NULL is returned and
331 * rpc_createerr.cf_stat is set to reflect the error.
333 * inet_ntop(3) is used here, since getnameinfo(3) is not available
334 * in some earlier glibc releases, and we don't require support for
335 * scope IDs for universal addresses.
337 char *nfs_sockaddr2universal(const struct sockaddr *sap,
338 const socklen_t salen)
340 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap;
341 const struct sockaddr_un *sun = (const struct sockaddr_un *)sap;
342 const struct sockaddr_in *sin = (const struct sockaddr_in *)sap;
343 char buf[INET6_ADDRSTRLEN + 8 /* for port information */];
349 switch (sap->sa_family) {
351 return strndup(sun->sun_path, sizeof(sun->sun_path));
353 if (inet_ntop(AF_INET, (const void *)&sin->sin_addr.s_addr,
354 buf, (socklen_t)sizeof(buf)) == NULL)
356 port = ntohs(sin->sin_port);
359 if (inet_ntop(AF_INET6, (const void *)&sin6->sin6_addr,
360 buf, (socklen_t)sizeof(buf)) == NULL)
362 port = ntohs(sin6->sin6_port);
368 count = sizeof(buf) - strlen(buf);
369 len = snprintf(buf + strlen(buf), count, ".%u.%u",
370 (unsigned)(port >> 8), (unsigned)(port & 0xff));
371 /* before glibc 2.0.6, snprintf(3) could return -1 */
372 if (len < 0 || (size_t)len > count)
375 result = strdup(buf);
380 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
385 * Send a NULL request to the indicated RPC service.
387 * Returns 1 if the service responded; otherwise 0;
389 static int nfs_gp_ping(CLIENT *client, struct timeval timeout)
391 enum clnt_stat status;
393 status = CLNT_CALL(client, NULLPROC,
394 (xdrproc_t)xdr_void, NULL,
395 (xdrproc_t)xdr_void, NULL,
398 return (int)(status == RPC_SUCCESS);
404 * Initialize the rpcb argument for a GETADDR request.
406 * Returns 1 if successful, and caller must free strings pointed
407 * to by r_netid and r_addr; otherwise 0.
409 static int nfs_gp_init_rpcb_parms(const struct sockaddr *sap,
410 const socklen_t salen,
411 const rpcprog_t program,
412 const rpcvers_t version,
413 const unsigned short protocol,
418 netid = nfs_gp_get_netid(sap->sa_family, protocol);
422 addr = nfs_sockaddr2universal(sap, salen);
428 memset(parms, 0, sizeof(*parms));
429 parms->r_prog = program;
430 parms->r_vers = version;
431 parms->r_netid = netid;
432 parms->r_addr = addr;
438 static void nfs_gp_free_rpcb_parms(struct rpcb *parms)
440 free(parms->r_netid);
445 * Try rpcbind GETADDR via version 4. If that fails, try same
446 * request via version 3.
448 * Returns non-zero port number on success; otherwise returns
449 * zero. rpccreateerr is set to reflect the nature of the error.
451 static unsigned short nfs_gp_rpcb_getaddr(CLIENT *client,
453 struct timeval timeout)
455 rpcvers_t rpcb_version;
456 struct rpc_err rpcerr;
459 for (rpcb_version = RPCBVERS_4;
460 rpcb_version >= RPCBVERS_3;
462 enum clnt_stat status;
465 CLNT_CONTROL(client, CLSET_VERS, (void *)&rpcb_version);
466 status = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR,
467 (xdrproc_t)xdr_rpcb, (void *)parms,
468 (xdrproc_t)xdr_wrapstring, (void *)&uaddr,
473 if ((uaddr == NULL) || (uaddr[0] == '\0')) {
474 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
478 port = nfs_universal2port(uaddr);
479 xdr_free((xdrproc_t)xdr_wrapstring, (char *)&uaddr);
481 rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE;
484 return (unsigned short)port;
485 case RPC_PROGVERSMISMATCH:
486 clnt_geterr(client, &rpcerr);
487 if (rpcerr.re_vers.low > RPCBVERS4)
490 case RPC_PROCUNAVAIL:
491 case RPC_PROGUNAVAIL:
494 /* Most likely RPC_TIMEDOUT or RPC_CANTRECV */
495 rpc_createerr.cf_stat = status;
496 clnt_geterr(client, &rpc_createerr.cf_error);
503 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
504 clnt_geterr(client, &rpc_createerr.cf_error);
509 #endif /* HAVE_LIBTIRPC */
512 * Try GETPORT request via rpcbind version 2.
514 * Returns non-zero port number on success; otherwise returns
515 * zero. rpccreateerr is set to reflect the nature of the error.
517 static unsigned long nfs_gp_pmap_getport(CLIENT *client,
519 struct timeval timeout)
521 enum clnt_stat status;
524 status = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT,
525 (xdrproc_t)xdr_pmap, (void *)parms,
526 (xdrproc_t)xdr_u_long, (void *)&port,
529 if (status != RPC_SUCCESS) {
530 rpc_createerr.cf_stat = status;
531 clnt_geterr(client, &rpc_createerr.cf_error);
533 } else if (port == 0)
534 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
541 static unsigned short nfs_gp_getport_rpcb(CLIENT *client,
542 const struct sockaddr *sap,
543 const socklen_t salen,
544 const rpcprog_t program,
545 const rpcvers_t version,
546 const unsigned short protocol,
547 struct timeval timeout)
549 unsigned short port = 0;
552 if (nfs_gp_init_rpcb_parms(sap, salen, program,
553 version, protocol, &parms) != 0) {
554 port = nfs_gp_rpcb_getaddr(client, &parms, timeout);
555 nfs_gp_free_rpcb_parms(&parms);
561 #endif /* HAVE_LIBTIRPC */
563 static unsigned long nfs_gp_getport_pmap(CLIENT *client,
564 const rpcprog_t program,
565 const rpcvers_t version,
566 const unsigned short protocol,
567 struct timeval timeout)
569 struct pmap parms = {
574 rpcvers_t pmap_version = PMAPVERS;
576 CLNT_CONTROL(client, CLSET_VERS, (void *)&pmap_version);
577 return nfs_gp_pmap_getport(client, &parms, timeout);
581 * Try an AF_INET6 request via rpcbind v4/v3; try an AF_INET
582 * request via rpcbind v2.
584 * Returns non-zero port number on success; otherwise returns
585 * zero. rpccreateerr is set to reflect the nature of the error.
587 static unsigned short nfs_gp_getport(CLIENT *client,
588 const struct sockaddr *sap,
589 const socklen_t salen,
590 const rpcprog_t program,
591 const rpcvers_t version,
592 const unsigned short protocol,
593 struct timeval timeout)
595 switch (sap->sa_family) {
598 return nfs_gp_getport_rpcb(client, sap, salen, program,
599 version, protocol, timeout);
600 #endif /* HAVE_LIBTIRPC */
602 return nfs_gp_getport_pmap(client, program, version,
606 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
611 * nfs_rpc_ping - Determine if RPC service is responding to requests
612 * @sap: pointer to address of server to query (port is already filled in)
613 * @salen: length of server address
614 * @program: requested RPC program number
615 * @version: requested RPC version number
616 * @protocol: requested IPPROTO_ value of transport protocol
617 * @timeout: pointer to request timeout (NULL means use default timeout)
619 * Returns 1 if the remote service responded without an error; otherwise
622 int nfs_rpc_ping(const struct sockaddr *sap, const socklen_t salen,
623 const rpcprog_t program, const rpcvers_t version,
624 const unsigned short protocol, const struct timeval *timeout)
626 struct sockaddr_storage address;
627 struct sockaddr *saddr = (struct sockaddr *)&address;
629 struct timeval tout = { -1, 0 };
635 memcpy(saddr, sap, (size_t)salen);
636 client = nfs_get_rpcclient(saddr, salen, protocol,
637 program, version, &tout);
638 if (client != NULL) {
639 result = nfs_gp_ping(client, tout);
640 CLNT_DESTROY(client);
647 * nfs_getport - query server's rpcbind to get port number for an RPC service
648 * @sap: pointer to address of server to query
649 * @salen: length of server's address
650 * @program: requested RPC program number
651 * @version: requested RPC version number
652 * @protocol: IPPROTO_ value of requested transport protocol
654 * Uses any acceptable rpcbind version to discover the port number for the
655 * RPC service described by the given [program, version, transport] tuple.
656 * Uses a quick timeout and an ephemeral source port. Supports AF_INET and
657 * AF_INET6 server addresses.
659 * Returns a positive integer representing the port number of the RPC
660 * service advertised by the server (in host byte order), or zero if the
661 * service is not advertised or there was some problem querying the server's
662 * rpcbind daemon. rpccreateerr is set to reflect the underlying cause of
665 * There are a variety of ways to choose which transport and rpcbind versions
666 * to use. We chose to conserve local resources and try to avoid incurring
670 * To provide rudimentary support for traversing firewalls, query the remote
671 * using the same transport as the requested service. This provides some
672 * guarantee that the requested transport is available between this client
673 * and the server, and if the caller specifically requests TCP, for example,
674 * this may be becuase a firewall is in place that blocks UDP traffic. We
675 * could try both, but that could involve a lengthy timeout in several cases,
676 * and would often consume an extra ephemeral port.
679 * To avoid using up too many ephemeral ports, AF_INET queries use tried-and-
680 * true rpcbindv2, and don't try the newer versions; and AF_INET6 queries use
681 * rpcbindv4, then rpcbindv3 on the same socket. The newer rpcbind protocol
682 * versions can adequately detect if a remote RPC service does not support
683 * AF_INET6 at all. The rpcbind socket is re-used in an attempt to keep the
684 * overall number of consumed ephemeral ports low.
686 unsigned short nfs_getport(const struct sockaddr *sap,
687 const socklen_t salen,
688 const rpcprog_t program,
689 const rpcvers_t version,
690 const unsigned short protocol)
692 struct sockaddr_storage address;
693 struct sockaddr *saddr = (struct sockaddr *)&address;
694 struct timeval timeout = { -1, 0 };
695 unsigned short port = 0;
698 memcpy(saddr, sap, (size_t)salen);
699 client = nfs_gp_get_rpcbclient(saddr, salen, protocol,
700 default_rpcb_version, &timeout);
701 if (client != NULL) {
702 port = nfs_gp_getport(client, saddr, salen, program,
703 version, protocol, timeout);
704 CLNT_DESTROY(client);
711 * nfs_getport_ping - query server's rpcbind and do RPC ping to verify result
712 * @sap: IN: pointer to address of server to query;
713 * OUT: pointer to updated address
714 * @salen: length of server's address
715 * @program: requested RPC program number
716 * @version: requested RPC version number
717 * @protocol: IPPROTO_ value of requested transport protocol
719 * Uses any acceptable rpcbind version to discover the port number for the
720 * RPC service described by the given [program, version, transport] tuple.
721 * Uses a quick timeout and an ephemeral source port. Supports AF_INET and
722 * AF_INET6 server addresses.
724 * Returns a 1 and sets the port number in the passed-in server address
725 * if both the query and the ping were successful; otherwise zero.
726 * rpccreateerr is set to reflect the underlying cause of the error.
728 int nfs_getport_ping(struct sockaddr *sap, const socklen_t salen,
729 const rpcprog_t program, const rpcvers_t version,
730 const unsigned short protocol)
732 struct timeval timeout = { -1, 0 };
733 unsigned short port = 0;
737 client = nfs_gp_get_rpcbclient(sap, salen, protocol,
738 default_rpcb_version, &timeout);
739 if (client != NULL) {
740 port = nfs_gp_getport(client, sap, salen, program,
741 version, protocol, timeout);
742 CLNT_DESTROY(client);
747 struct sockaddr_storage address;
748 struct sockaddr *saddr = (struct sockaddr *)&address;
750 memcpy(saddr, sap, (size_t)salen);
751 nfs_gp_set_port(saddr, htons(port));
753 client = nfs_get_rpcclient(saddr, salen, protocol,
754 program, version, &timeout);
755 if (client != NULL) {
756 result = nfs_gp_ping(client, timeout);
757 CLNT_DESTROY(client);
762 nfs_gp_set_port(sap, htons(port));
768 * nfs_getlocalport - query local rpcbind to get port number for an RPC service
769 * @program: requested RPC program number
770 * @version: requested RPC version number
771 * @protocol: IPPROTO_ value of requested transport protocol
773 * Uses any acceptable rpcbind version to discover the port number for the
774 * RPC service described by the given [program, version, transport] tuple.
775 * Uses a quick timeout and an ephemeral source port. Supports AF_INET and
776 * AF_INET6 local addresses.
778 * Returns a positive integer representing the port number of the RPC
779 * service advertised by the server (in host byte order), or zero if the
780 * service is not advertised or there was some problem querying the server's
781 * rpcbind daemon. rpccreateerr is set to reflect the underlying cause of
784 * Try an AF_LOCAL connection first. The rpcbind daemon implementation should
785 * listen on AF_LOCAL.
787 * If that doesn't work (for example, if portmapper is running, or rpcbind
788 * isn't listening on /var/run/rpcbind.sock), send a query via UDP to localhost
789 * (UDP doesn't leave a socket in TIME_WAIT, and the timeout is a relatively
792 unsigned short nfs_getlocalport(const rpcprot_t program,
793 const rpcvers_t version,
794 const unsigned short protocol)
796 struct sockaddr_storage address;
797 struct sockaddr *lb_addr = (struct sockaddr *)&address;
798 socklen_t lb_len = sizeof(*lb_addr);
799 unsigned short port = 0;
802 const struct sockaddr_un sun = {
803 .sun_family = AF_LOCAL,
804 .sun_path = _PATH_RPCBINDSOCK,
806 const struct sockaddr *sap = (struct sockaddr *)&sun;
807 const socklen_t salen = SUN_LEN(&sun);
809 struct timeval timeout = { -1, 0 };
811 client = nfs_gp_get_rpcbclient(sap, salen, 0, RPCBVERS_4, &timeout);
812 if (client != NULL) {
815 if (nfs_gp_init_rpcb_parms(sap, salen, program, version,
816 protocol, &parms) != 0) {
817 port = nfs_gp_rpcb_getaddr(client, &parms, timeout);
818 nfs_gp_free_rpcb_parms(&parms);
820 CLNT_DESTROY(client);
822 #endif /* NFS_GP_LOCAL */
825 if (nfs_gp_loopback_address(lb_addr, &lb_len)) {
826 port = nfs_getport(lb_addr, lb_len,
827 program, version, protocol);
829 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
836 * nfs_rpcb_getaddr - query rpcbind via rpcbind versions 4 and 3
837 * @sap: pointer to address of server to query
838 * @salen: length of server address
839 * @transport: transport protocol to use for the query
840 * @addr: pointer to r_addr address
841 * @addrlen: length of address
842 * @program: requested RPC program number
843 * @version: requested RPC version number
844 * @protocol: requested IPPROTO_ value of transport protocol
845 * @timeout: pointer to request timeout (NULL means use default timeout)
847 * Returns a positive integer representing the port number of the RPC
848 * service advertised by the server (in host byte order), or zero if the
849 * service is not advertised or there was some problem querying the
850 * server's rpcbind daemon. rpccreateerr is set to reflect the
851 * underlying cause of the error.
853 * This function provides similar functionality to nfs_pmap_getport(),
854 * but performs the rpcbind lookup via rpcbind version 4. If the server
855 * doesn't support rpcbind version 4, it will retry with version 3.
856 * The GETADDR procedure is exactly the same in these two versions of
857 * the rpcbind protocol, so the socket, RPC client, and arguments are
858 * re-used when retrying, saving ephemeral port space.
860 * These RPC procedures take a universal address as an argument, so the
861 * query will fail if the remote rpcbind daemon doesn't find an entry
862 * with a matching address. A matching address includes an ANYADDR
863 * address of the same address family. In this way an RPC server can
864 * advertise via rpcbind that it does not support AF_INET6.
868 unsigned short nfs_rpcb_getaddr(const struct sockaddr *sap,
869 const socklen_t salen,
870 const unsigned short transport,
871 const struct sockaddr *addr,
872 const socklen_t addrlen,
873 const rpcprog_t program,
874 const rpcvers_t version,
875 const unsigned short protocol,
876 const struct timeval *timeout)
878 struct sockaddr_storage address;
879 struct sockaddr *saddr = (struct sockaddr *)&address;
882 struct timeval tout = { -1, 0 };
883 unsigned short port = 0;
888 memcpy(saddr, sap, (size_t)salen);
889 client = nfs_gp_get_rpcbclient(saddr, salen, transport,
891 if (client != NULL) {
892 if (nfs_gp_init_rpcb_parms(addr, addrlen, program, version,
893 protocol, &parms) != 0) {
894 port = nfs_gp_rpcb_getaddr(client, &parms, tout);
895 nfs_gp_free_rpcb_parms(&parms);
897 CLNT_DESTROY(client);
903 #else /* !HAVE_LIBTIRPC */
905 unsigned short nfs_rpcb_getaddr(const struct sockaddr *sap,
906 const socklen_t salen,
907 const unsigned short transport,
908 const struct sockaddr *addr,
909 const socklen_t addrlen,
910 const rpcprog_t program,
911 const rpcvers_t version,
912 const unsigned short protocol,
913 const struct timeval *timeout)
915 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
919 #endif /* !HAVE_LIBTIRPC */
922 * nfs_pmap_getport - query rpcbind via the portmap protocol (rpcbindv2)
923 * @sin: pointer to AF_INET address of server to query
924 * @transport: transport protocol to use for the query
925 * @program: requested RPC program number
926 * @version: requested RPC version number
927 * @protocol: requested IPPROTO_ value of transport protocol
928 * @timeout: pointer to request timeout (NULL means use default timeout)
930 * Returns a positive integer representing the port number of the RPC service
931 * advertised by the server (in host byte order), or zero if the service is
932 * not advertised or there was some problem querying the server's rpcbind
933 * daemon. rpccreateerr is set to reflect the underlying cause of the error.
935 * nfs_pmap_getport() is very similar to pmap_getport(), except that:
937 * 1. This version always tries to use an ephemeral port, since reserved
938 * ports are not needed for GETPORT queries. This conserves the very
939 * limited reserved port space, helping reduce failed socket binds
940 * during mount storms.
942 * 2. This version times out quickly by default. It time-limits the
943 * connect process as well as the actual RPC call, and even allows the
944 * caller to specify the timeout.
946 * 3. This version shares code with the rpcbindv3 and rpcbindv4 query
947 * functions. It can use a TI-RPC generated CLIENT.
949 unsigned long nfs_pmap_getport(const struct sockaddr_in *sin,
950 const unsigned short transport,
951 const unsigned long program,
952 const unsigned long version,
953 const unsigned long protocol,
954 const struct timeval *timeout)
956 struct sockaddr_in address;
957 struct sockaddr *saddr = (struct sockaddr *)&address;
959 struct pmap parms = {
964 struct timeval tout = { -1, 0 };
965 unsigned long port = 0;
970 memcpy(saddr, sin, sizeof(address));
971 client = nfs_gp_get_rpcbclient(saddr, (socklen_t)sizeof(*sin),
972 transport, PMAPVERS, &tout);
973 if (client != NULL) {
974 port = nfs_gp_pmap_getport(client, &parms, tout);
975 CLNT_DESTROY(client);