2 * network.c -- Provide common network functions for NFS mount/umount
4 * Copyright (C) 2007 Oracle. All rights reserved.
5 * Copyright (C) 2007 Chuck Lever <chuck.lever@oracle.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public
18 * License along with this program; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 021110-1307, USA.
37 #include <sys/types.h>
38 #include <sys/socket.h>
40 #include <netinet/in.h>
42 #include <rpc/pmap_prot.h>
43 #include <rpc/pmap_clnt.h>
48 #include "nfs_mount.h"
49 #include "mount_constants.h"
53 #define PMAP_TIMEOUT (10)
54 #define CONNECT_TIMEOUT (20)
55 #define MOUNT_TIMEOUT (30)
57 #if SIZEOF_SOCKLEN_T - 0 == 0
58 #define socklen_t unsigned int
61 extern int nfs_mount_data_version;
62 extern char *progname;
65 static const char *nfs_ns_pgmtbl[] = {
70 static const unsigned long nfs_to_mnt[] = {
77 static const unsigned long mnt_to_nfs[] = {
85 * Map an NFS version into the corresponding Mountd version
87 unsigned long nfsvers_to_mnt(const unsigned long vers)
90 return nfs_to_mnt[vers];
95 * Map a Mountd version into the corresponding NFS version
97 static unsigned long mntvers_to_nfs(const unsigned long vers)
100 return mnt_to_nfs[vers];
104 static const unsigned int probe_udp_only[] = {
109 static const unsigned int probe_udp_first[] = {
115 static const unsigned int probe_tcp_first[] = {
121 static const unsigned long probe_nfs2_only[] = {
126 static const unsigned long probe_nfs3_first[] = {
132 static const unsigned long probe_mnt1_first[] = {
138 static const unsigned long probe_mnt3_first[] = {
145 static void nfs_set_port(struct sockaddr *sap, const unsigned short port)
147 switch (sap->sa_family) {
149 ((struct sockaddr_in *)sap)->sin_port = htons(port);
152 ((struct sockaddr_in6 *)sap)->sin6_port = htons(port);
155 nfs_error(_("%s: unrecognized address family in %s"),
160 #ifdef HAVE_DECL_AI_ADDRCONFIG
162 * nfs_name_to_address - resolve hostname to an IPv4 or IPv6 socket address
163 * @hostname: pointer to C string containing DNS hostname to resolve
164 * @af_hint: hint to restrict resolution to one address family
165 * @sap: pointer to buffer to fill with socket address
166 * @len: IN: size of buffer to fill; OUT: size of socket address
168 * Returns 1 and places a socket address at @sap if successful;
171 int nfs_name_to_address(const char *hostname,
172 const sa_family_t af_hint,
173 struct sockaddr *sap, socklen_t *salen)
175 struct addrinfo *gai_results;
176 struct addrinfo gai_hint = {
177 .ai_family = af_hint,
178 .ai_flags = AI_ADDRCONFIG,
180 socklen_t len = *salen;
183 if (af_hint == AF_INET6)
184 gai_hint.ai_flags |= AI_V4MAPPED|AI_ALL;
188 error = getaddrinfo(hostname, NULL, &gai_hint, &gai_results);
190 nfs_error(_("%s: DNS resolution failed for %s: %s"),
191 progname, hostname, (error == EAI_SYSTEM ?
192 strerror(errno) : gai_strerror(error)));
196 switch (gai_results->ai_addr->sa_family) {
199 if (len >= gai_results->ai_addrlen) {
200 *salen = gai_results->ai_addrlen;
201 memcpy(sap, gai_results->ai_addr, *salen);
206 /* things are really broken if we get here, so warn */
207 nfs_error(_("%s: unrecognized DNS resolution results for %s"),
212 freeaddrinfo(gai_results);
215 #else /* HAVE_DECL_AI_ADDRCONFIG */
217 * nfs_name_to_address - resolve hostname to an IPv4 socket address
218 * @hostname: pointer to C string containing DNS hostname to resolve
219 * @af_hint: hint to restrict resolution to one address family
220 * @sap: pointer to buffer to fill with socket address
221 * @len: IN: size of buffer to fill; OUT: size of socket address
223 * Returns 1 and places a socket address at @sap if successful;
226 * Some older getaddrinfo(3) implementations don't support
227 * AI_ADDRCONFIG or AI_V4MAPPED properly. For those cases, a DNS
228 * resolver based on the traditional gethostbyname(3) is provided.
230 int nfs_name_to_address(const char *hostname,
231 const sa_family_t af_hint,
232 struct sockaddr *sap, socklen_t *salen)
234 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
235 socklen_t len = *salen;
240 if (af_hint != AF_INET) {
241 nfs_error(_("%s: address family not supported by DNS resolver\n"),
246 sin->sin_family = AF_INET;
247 if (inet_aton(hostname, &sin->sin_addr)) {
248 *salen = sizeof(*sin);
252 hp = gethostbyname(hostname);
254 nfs_error(_("%s: DNS resolution failed for %s: %s"),
255 progname, hostname, hstrerror(h_errno));
259 if (hp->h_length > len) {
260 nfs_error(_("%s: DNS resolution results too long for buffer\n"),
265 memcpy(&sin->sin_addr, hp->h_addr, hp->h_length);
266 *salen = hp->h_length;
269 #endif /* HAVE_DECL_AI_ADDRCONFIG */
272 * nfs_gethostbyname - resolve a hostname to an IPv4 address
273 * @hostname: pointer to a C string containing a DNS hostname
274 * @sin: returns an IPv4 address
276 * Returns 1 if successful, otherwise zero.
278 int nfs_gethostbyname(const char *hostname, struct sockaddr_in *sin)
280 socklen_t len = sizeof(*sin);
282 return nfs_name_to_address(hostname, AF_INET,
283 (struct sockaddr *)sin, &len);
287 * nfs_string_to_sockaddr - convert string address to sockaddr
288 * @address: pointer to presentation format address to convert
289 * @addrlen: length of presentation address
290 * @sap: pointer to socket address buffer to fill in
291 * @salen: IN: length of address buffer
292 * OUT: length of converted socket address
294 * Convert a presentation format address string to a socket address.
295 * Similar to nfs_name_to_address(), but the DNS query is squelched,
296 * and won't make any noise if the getaddrinfo() call fails.
298 * Returns 1 and fills in @sap and @salen if successful; otherwise zero.
300 * See RFC 4038 section 5.1 or RFC 3513 section 2.2 for more details
301 * on presenting IPv6 addresses as text strings.
303 int nfs_string_to_sockaddr(const char *address, const size_t addrlen,
304 struct sockaddr *sap, socklen_t *salen)
306 struct addrinfo *gai_results;
307 struct addrinfo gai_hint = {
308 .ai_flags = AI_NUMERICHOST,
310 socklen_t len = *salen;
315 if (getaddrinfo(address, NULL, &gai_hint, &gai_results) == 0) {
316 switch (gai_results->ai_addr->sa_family) {
319 if (len >= gai_results->ai_addrlen) {
320 *salen = gai_results->ai_addrlen;
321 memcpy(sap, gai_results->ai_addr, *salen);
326 freeaddrinfo(gai_results);
333 * nfs_present_sockaddr - convert sockaddr to string
334 * @sap: pointer to socket address to convert
335 * @salen: length of socket address
336 * @buf: pointer to buffer to fill in
337 * @buflen: length of buffer
339 * Convert the passed-in sockaddr-style address to presentation format.
340 * The presentation format address is placed in @buf and is
343 * Returns 1 if successful; otherwise zero.
345 * See RFC 4038 section 5.1 or RFC 3513 section 2.2 for more details
346 * on presenting IPv6 addresses as text strings.
348 int nfs_present_sockaddr(const struct sockaddr *sap, const socklen_t salen,
349 char *buf, const size_t buflen)
351 #ifdef HAVE_GETNAMEINFO
354 result = getnameinfo(sap, salen, buf, buflen,
355 NULL, 0, NI_NUMERICHOST);
359 nfs_error(_("%s: invalid server address: %s"), progname,
360 gai_strerror(result));
362 #else /* HAVE_GETNAMEINFO */
365 if (sap->sa_family == AF_INET) {
366 addr = inet_ntoa(((struct sockaddr_in *)sap)->sin_addr);
367 if (addr && strlen(addr) < buflen) {
373 nfs_error(_("%s: invalid server address"), progname);
375 #endif /* HAVE_GETNAMEINFO */
379 * Attempt to connect a socket, but time out after "timeout" seconds.
381 * On error return, caller closes the socket.
383 static int connect_to(int fd, struct sockaddr *addr,
384 socklen_t addrlen, int timeout)
388 struct timeval tv = {
392 saved = fcntl(fd, F_GETFL, 0);
393 fcntl(fd, F_SETFL, saved | O_NONBLOCK);
395 ret = connect(fd, addr, addrlen);
396 if (ret < 0 && errno != EINPROGRESS)
404 ret = select(fd + 1, &rset, &wset, NULL, &tv);
409 if (FD_ISSET(fd, &rset) || FD_ISSET(fd, &wset)) {
411 socklen_t len = sizeof(error);
412 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0)
422 fcntl(fd, F_SETFL, saved);
427 * Create a socket that is locally bound to a reserved or non-reserved port.
429 * The caller should check rpc_createerr to determine the cause of any error.
431 static int get_socket(struct sockaddr_in *saddr, unsigned int p_prot,
432 unsigned int timeout, int resvp, int conn)
435 struct sockaddr_in laddr;
436 socklen_t namelen = sizeof(laddr);
438 type = (p_prot == IPPROTO_UDP ? SOCK_DGRAM : SOCK_STREAM);
439 if ((so = socket (AF_INET, type, p_prot)) < 0)
442 laddr.sin_family = AF_INET;
444 laddr.sin_addr.s_addr = htonl(INADDR_ANY);
446 if (bindresvport(so, &laddr) < 0)
447 goto err_bindresvport;
449 cc = bind(so, (struct sockaddr *)&laddr, namelen);
453 if (type == SOCK_STREAM || (conn && type == SOCK_DGRAM)) {
454 cc = connect_to(so, (struct sockaddr *)saddr, namelen,
462 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
463 rpc_createerr.cf_error.re_errno = errno;
465 nfs_error(_("%s: Unable to create %s socket: errno %d (%s)\n"),
466 progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
467 errno, strerror(errno));
472 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
473 rpc_createerr.cf_error.re_errno = errno;
475 nfs_error(_("%s: Unable to bindresvport %s socket: errno %d"
477 progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
478 errno, strerror(errno));
484 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
485 rpc_createerr.cf_error.re_errno = errno;
487 nfs_error(_("%s: Unable to bind to %s socket: errno %d (%s)\n"),
488 progname, p_prot == IPPROTO_UDP ? _("UDP") : _("TCP"),
489 errno, strerror(errno));
495 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
496 rpc_createerr.cf_error.re_errno = errno;
498 nfs_error(_("%s: Unable to connect to %s:%d, errno %d (%s)\n"),
499 progname, inet_ntoa(saddr->sin_addr),
500 ntohs(saddr->sin_port), errno, strerror(errno));
506 static void nfs_pp_debug(const struct sockaddr *sap, const socklen_t salen,
507 const rpcprog_t program, const rpcvers_t version,
508 const unsigned short protocol,
509 const unsigned short port)
511 char buf[NI_MAXHOST];
516 if (nfs_present_sockaddr(sap, salen, buf, sizeof(buf)) == 0) {
518 strcat(buf, "unknown host");
521 fprintf(stderr, _("%s: trying %s prog %ld vers %ld prot %s port %d\n"),
522 progname, buf, program, version,
523 (protocol == IPPROTO_UDP ? _("UDP") : _("TCP")),
528 * Use the portmapper to discover whether or not the service we want is
529 * available. The lists 'versions' and 'protos' define ordered sequences
530 * of service versions and udp/tcp protocols to probe for.
532 * Returns 1 if the requested service port is unambiguous and pingable;
533 * @pmap is filled in with the version, port, and transport protocol used
534 * during the successful ping. Note that if a port is already specified
535 * in @pmap and it matches the rpcbind query result, nfs_probe_port() does
536 * not perform an RPC ping.
538 * If an error occurs or the requested service isn't available, zero is
539 * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
541 static int nfs_probe_port(const struct sockaddr *sap, const socklen_t salen,
542 struct pmap *pmap, const unsigned long *versions,
543 const unsigned int *protos)
545 struct sockaddr_storage address;
546 struct sockaddr *saddr = (struct sockaddr *)&address;
547 const unsigned long prog = pmap->pm_prog, *p_vers;
548 const unsigned int prot = (u_int)pmap->pm_prot, *p_prot;
549 const u_short port = (u_short) pmap->pm_port;
550 unsigned long vers = pmap->pm_vers;
551 unsigned short p_port;
553 memcpy(saddr, sap, salen);
554 p_prot = prot ? &prot : protos;
555 p_vers = vers ? &vers : versions;
556 rpc_createerr.cf_stat = 0;
559 p_port = nfs_getport(saddr, salen, prog, *p_vers, *p_prot);
561 if (!port || port == p_port) {
562 nfs_set_port(saddr, p_port);
563 nfs_pp_debug(saddr, salen, prog, *p_vers,
565 if (nfs_rpc_ping(saddr, salen, prog,
566 *p_vers, *p_prot, NULL))
570 if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
571 rpc_createerr.cf_stat != RPC_TIMEDOUT &&
572 rpc_createerr.cf_stat != RPC_CANTRECV &&
573 rpc_createerr.cf_stat != RPC_PROGVERSMISMATCH)
581 if (rpc_createerr.cf_stat == RPC_TIMEDOUT ||
582 rpc_createerr.cf_stat == RPC_CANTRECV)
585 if (vers || !*++p_vers)
594 pmap->pm_vers = *p_vers;
596 pmap->pm_prot = *p_prot;
598 pmap->pm_port = p_port;
599 rpc_createerr.cf_stat = 0;
604 * Probe a server's NFS service to determine which versions and
605 * transport protocols are supported.
607 * Returns 1 if the requested service port is unambiguous and pingable;
608 * @pmap is filled in with the version, port, and transport protocol used
609 * during the successful ping. If all three are already specified, simply
610 * return success without an rpcbind query or RPC ping (we may be trying
611 * to mount an NFS service that is not advertised via rpcbind).
613 * If an error occurs or the requested service isn't available, zero is
614 * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
616 static int nfs_probe_nfsport(const struct sockaddr *sap, const socklen_t salen,
619 if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
622 if (nfs_mount_data_version >= 4)
623 return nfs_probe_port(sap, salen, pmap,
624 probe_nfs3_first, probe_tcp_first);
626 return nfs_probe_port(sap, salen, pmap,
627 probe_nfs2_only, probe_udp_only);
631 * Probe a server's mountd service to determine which versions and
632 * transport protocols are supported.
634 * Returns 1 if the requested service port is unambiguous and pingable;
635 * @pmap is filled in with the version, port, and transport protocol used
636 * during the successful ping. If all three are already specified, simply
637 * return success without an rpcbind query or RPC ping (we may be trying
638 * to mount an NFS service that is not advertised via rpcbind).
640 * If an error occurs or the requested service isn't available, zero is
641 * returned; rpccreateerr.cf_stat is set to reflect the nature of the error.
643 static int nfs_probe_mntport(const struct sockaddr *sap, const socklen_t salen,
646 if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
649 if (nfs_mount_data_version >= 4)
650 return nfs_probe_port(sap, salen, pmap,
651 probe_mnt3_first, probe_udp_first);
653 return nfs_probe_port(sap, salen, pmap,
654 probe_mnt1_first, probe_udp_only);
658 * Probe a server's mountd service to determine which versions and
659 * transport protocols are supported. Invoked when the protocol
660 * version is already known for both the NFS and mountd service.
662 * Returns 1 and fills in both @pmap structs if the requested service
663 * ports are unambiguous and pingable. Otherwise zero is returned;
664 * rpccreateerr.cf_stat is set to reflect the nature of the error.
666 static int nfs_probe_version_fixed(const struct sockaddr *mnt_saddr,
667 const socklen_t mnt_salen,
668 struct pmap *mnt_pmap,
669 const struct sockaddr *nfs_saddr,
670 const socklen_t nfs_salen,
671 struct pmap *nfs_pmap)
673 if (!nfs_probe_nfsport(nfs_saddr, nfs_salen, nfs_pmap))
675 return nfs_probe_mntport(mnt_saddr, mnt_salen, mnt_pmap);
679 * nfs_probe_bothports - discover the RPC endpoints of mountd and NFS server
680 * @mnt_saddr: pointer to socket address of mountd server
681 * @mnt_salen: length of mountd server's address
682 * @mnt_pmap: IN: partially filled-in mountd RPC service tuple;
683 * OUT: fully filled-in mountd RPC service tuple
684 * @nfs_saddr: pointer to socket address of NFS server
685 * @nfs_salen: length of NFS server's address
686 * @nfs_pmap: IN: partially filled-in NFS RPC service tuple;
687 * OUT: fully filled-in NFS RPC service tuple
689 * Returns 1 and fills in both @pmap structs if the requested service
690 * ports are unambiguous and pingable. Otherwise zero is returned;
691 * rpccreateerr.cf_stat is set to reflect the nature of the error.
693 int nfs_probe_bothports(const struct sockaddr *mnt_saddr,
694 const socklen_t mnt_salen,
695 struct pmap *mnt_pmap,
696 const struct sockaddr *nfs_saddr,
697 const socklen_t nfs_salen,
698 struct pmap *nfs_pmap)
700 struct pmap save_nfs, save_mnt;
701 const unsigned long *probe_vers;
703 if (mnt_pmap->pm_vers && !nfs_pmap->pm_vers)
704 nfs_pmap->pm_vers = mntvers_to_nfs(mnt_pmap->pm_vers);
705 else if (nfs_pmap->pm_vers && !mnt_pmap->pm_vers)
706 mnt_pmap->pm_vers = nfsvers_to_mnt(nfs_pmap->pm_vers);
708 if (nfs_pmap->pm_vers)
709 return nfs_probe_version_fixed(mnt_saddr, mnt_salen, mnt_pmap,
710 nfs_saddr, nfs_salen, nfs_pmap);
712 memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
713 memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
714 probe_vers = (nfs_mount_data_version >= 4) ?
715 probe_mnt3_first : probe_mnt1_first;
717 for (; *probe_vers; probe_vers++) {
718 nfs_pmap->pm_vers = mntvers_to_nfs(*probe_vers);
719 if (nfs_probe_nfsport(nfs_saddr, nfs_salen, nfs_pmap) != 0) {
720 mnt_pmap->pm_vers = *probe_vers;
721 if (nfs_probe_mntport(mnt_saddr, mnt_salen, mnt_pmap) != 0)
723 memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
725 switch (rpc_createerr.cf_stat) {
726 case RPC_PROGVERSMISMATCH:
727 case RPC_PROGNOTREGISTERED:
732 memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
739 * probe_bothports - discover the RPC endpoints of mountd and NFS server
740 * @mnt_server: pointer to address and pmap argument for mountd results
741 * @nfs_server: pointer to address and pmap argument for NFS server
743 * This is the legacy API that takes "clnt_addr_t" for both servers,
744 * but supports only AF_INET addresses.
746 * Returns 1 and fills in the pmap field in both clnt_addr_t structs
747 * if the requested service ports are unambiguous and pingable.
748 * Otherwise zero is returned; rpccreateerr.cf_stat is set to reflect
749 * the nature of the error.
751 int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
753 return nfs_probe_bothports((struct sockaddr *)&mnt_server->saddr,
754 sizeof(mnt_server->saddr),
756 (struct sockaddr *)&nfs_server->saddr,
757 sizeof(nfs_server->saddr),
761 static int nfs_probe_statd(void)
763 struct sockaddr_in addr = {
764 .sin_family = AF_INET,
765 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
767 rpcprog_t program = nfs_getrpcbyname(NSMPROG, nfs_ns_pgmtbl);
769 return nfs_getport_ping((struct sockaddr *)&addr, sizeof(addr),
770 program, (rpcvers_t)1, IPPROTO_UDP);
774 * start_statd - attempt to start rpc.statd
776 * Returns 1 if statd is running; otherwise zero.
778 int start_statd(void)
784 if (nfs_probe_statd())
788 if (stat(START_STATD, &stb) == 0) {
789 if (S_ISREG(stb.st_mode) && (stb.st_mode & S_IXUSR)) {
793 execl(START_STATD, START_STATD, NULL);
796 nfs_error(_("fork failed: %s"),
799 default: /* parent */
800 waitpid(pid, NULL,0);
803 if (nfs_probe_statd())
813 * nfs_call_umount - ask the server to remove a share from it's rmtab
814 * @mnt_server: address of RPC MNT program server
815 * @argp: directory path of share to "unmount"
817 * Returns one if the unmount call succeeded; zero if the unmount
818 * failed for any reason.
820 * Note that a side effect of calling this function is that rpccreateerr
823 int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
825 struct sockaddr *sap = (struct sockaddr *)&mnt_server->saddr;
826 socklen_t salen = sizeof(mnt_server->saddr);
827 struct pmap *pmap = &mnt_server->pmap;
829 enum clnt_stat res = 0;
832 if (!nfs_probe_mntport(sap, salen, pmap))
834 clnt = mnt_openclnt(mnt_server, &msock);
837 res = clnt_call(clnt, MOUNTPROC_UMNT,
838 (xdrproc_t)xdr_dirpath, (caddr_t)argp,
839 (xdrproc_t)xdr_void, NULL,
841 mnt_closeclnt(clnt, msock);
843 if (res == RPC_SUCCESS)
849 * mnt_openclnt - get a handle for a remote mountd service
850 * @mnt_server: address and pmap arguments of mountd service
851 * @msock: returns a file descriptor of the underlying transport socket
853 * Returns an active handle for the remote's mountd service
855 CLIENT *mnt_openclnt(clnt_addr_t *mnt_server, int *msock)
857 struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
858 struct pmap *mnt_pmap = &mnt_server->pmap;
861 mnt_saddr->sin_port = htons((u_short)mnt_pmap->pm_port);
862 *msock = get_socket(mnt_saddr, mnt_pmap->pm_prot, MOUNT_TIMEOUT,
864 if (*msock == RPC_ANYSOCK) {
865 if (rpc_createerr.cf_error.re_errno == EADDRINUSE)
867 * Probably in-use by a TIME_WAIT connection,
868 * It is worth waiting a while and trying again.
870 rpc_createerr.cf_stat = RPC_TIMEDOUT;
874 switch (mnt_pmap->pm_prot) {
876 clnt = clntudp_bufcreate(mnt_saddr,
877 mnt_pmap->pm_prog, mnt_pmap->pm_vers,
878 RETRY_TIMEOUT, msock,
879 MNT_SENDBUFSIZE, MNT_RECVBUFSIZE);
882 clnt = clnttcp_create(mnt_saddr,
883 mnt_pmap->pm_prog, mnt_pmap->pm_vers,
885 MNT_SENDBUFSIZE, MNT_RECVBUFSIZE);
889 /* try to mount hostname:dirname */
890 clnt->cl_auth = authunix_create_default();
897 * mnt_closeclnt - terminate a handle for a remote mountd service
898 * @clnt: pointer to an active handle for a remote mountd service
899 * @msock: file descriptor of the underlying transport socket
902 void mnt_closeclnt(CLIENT *clnt, int msock)
904 auth_destroy(clnt->cl_auth);
910 * clnt_ping - send an RPC ping to the remote RPC service endpoint
911 * @saddr: server's address
912 * @prog: target RPC program number
913 * @vers: target RPC version number
914 * @prot: target RPC protocol
915 * @caddr: filled in with our network address
917 * Sigh... GETPORT queries don't actually check the version number.
918 * In order to make sure that the server actually supports the service
919 * we're requesting, we open an RPC client, and fire off a NULL
922 * caddr is the network address that the server will use to call us back.
923 * On multi-homed clients, this address depends on which NIC we use to
924 * route requests to the server.
926 * Returns one if successful, otherwise zero.
928 int clnt_ping(struct sockaddr_in *saddr, const unsigned long prog,
929 const unsigned long vers, const unsigned int prot,
930 struct sockaddr_in *caddr)
934 static char clnt_res;
935 struct sockaddr dissolve;
937 rpc_createerr.cf_stat = stat = 0;
938 sock = get_socket(saddr, prot, CONNECT_TIMEOUT, FALSE, TRUE);
939 if (sock == RPC_ANYSOCK) {
940 if (rpc_createerr.cf_error.re_errno == ETIMEDOUT) {
942 * TCP timeout. Bubble up the error to see
943 * how it should be handled.
945 rpc_createerr.cf_stat = RPC_TIMEDOUT;
951 /* Get the address of our end of this connection */
952 socklen_t len = sizeof(*caddr);
953 if (getsockname(sock, caddr, &len) != 0)
954 caddr->sin_family = 0;
959 /* The socket is connected (so we could getsockname successfully),
960 * but some servers on multi-homed hosts reply from
961 * the wrong address, so if we stay connected, we lose the reply.
963 dissolve.sa_family = AF_UNSPEC;
964 connect(sock, &dissolve, sizeof(dissolve));
966 clnt = clntudp_bufcreate(saddr, prog, vers,
967 RETRY_TIMEOUT, &sock,
968 RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
971 clnt = clnttcp_create(saddr, prog, vers, &sock,
972 RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
979 memset(&clnt_res, 0, sizeof(clnt_res));
980 stat = clnt_call(clnt, NULLPROC,
981 (xdrproc_t)xdr_void, (caddr_t)NULL,
982 (xdrproc_t)xdr_void, (caddr_t)&clnt_res,
985 clnt_geterr(clnt, &rpc_createerr.cf_error);
986 rpc_createerr.cf_stat = stat;
991 if (stat == RPC_SUCCESS)
998 * Try a getsockname() on a connected datagram socket.
1000 * Returns 1 and fills in @buf if successful; otherwise, zero.
1002 * A connected datagram socket prevents leaving a socket in TIME_WAIT.
1003 * This conserves the ephemeral port number space, helping reduce failed
1004 * socket binds during mount storms.
1006 static int nfs_ca_sockname(const struct sockaddr *sap, const socklen_t salen,
1007 struct sockaddr *buf, socklen_t *buflen)
1009 struct sockaddr_in sin = {
1010 .sin_family = AF_INET,
1011 .sin_addr.s_addr = htonl(INADDR_ANY),
1013 struct sockaddr_in6 sin6 = {
1014 .sin6_family = AF_INET6,
1015 .sin6_addr = IN6ADDR_ANY_INIT,
1019 sock = socket(sap->sa_family, SOCK_DGRAM, IPPROTO_UDP);
1023 switch (sap->sa_family) {
1025 if (bind(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
1031 if (bind(sock, (struct sockaddr *)&sin6, sizeof(sin6)) < 0) {
1037 errno = EAFNOSUPPORT;
1041 if (connect(sock, sap, salen) < 0) {
1046 return !getsockname(sock, buf, buflen);
1050 * Try to generate an address that prevents the server from calling us.
1052 * Returns 1 and fills in @buf if successful; otherwise, zero.
1054 static int nfs_ca_gai(const struct sockaddr *sap, const socklen_t salen,
1055 struct sockaddr *buf, socklen_t *buflen)
1057 struct addrinfo *gai_results;
1058 struct addrinfo gai_hint = {
1059 .ai_family = sap->sa_family,
1060 .ai_flags = AI_PASSIVE, /* ANYADDR */
1063 if (getaddrinfo(NULL, "", &gai_hint, &gai_results))
1066 *buflen = gai_results->ai_addrlen;
1067 memcpy(buf, gai_results->ai_addr, *buflen);
1069 freeaddrinfo(gai_results);
1075 * nfs_callback_address - acquire our local network address
1076 * @sap: pointer to address of remote
1077 * @sap_len: length of address
1078 * @buf: pointer to buffer to be filled in with local network address
1079 * @buflen: IN: length of buffer to fill in; OUT: length of filled-in address
1081 * Discover a network address that an NFSv4 server can use to call us back.
1082 * On multi-homed clients, this address depends on which NIC we use to
1083 * route requests to the server.
1085 * Returns 1 and fills in @buf if an unambiguous local address is
1086 * available; returns 1 and fills in an appropriate ANYADDR address
1087 * if a local address isn't available; otherwise, returns zero.
1089 int nfs_callback_address(const struct sockaddr *sap, const socklen_t salen,
1090 struct sockaddr *buf, socklen_t *buflen)
1092 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)buf;
1094 if (nfs_ca_sockname(sap, salen, buf, buflen) == 0)
1095 if (nfs_ca_gai(sap, salen, buf, buflen) == 0)
1099 * The server can't use an interface ID that was generated
1100 * here on the client, so always clear sin6_scope_id.
1102 if (sin6->sin6_family == AF_INET6)
1103 sin6->sin6_scope_id = 0;
1110 nfs_error(_("%s: failed to construct callback address"));