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.
33 #include <rpc/pmap_prot.h>
34 #include <rpc/pmap_clnt.h>
35 #include <sys/socket.h>
41 #include "nfs_mount.h"
42 #include "mount_constants.h"
45 #ifdef HAVE_RPCSVC_NFS_PROT_H
46 #include <rpcsvc/nfs_prot.h>
48 #include <linux/nfs.h>
49 #define nfsstat nfs_stat
56 extern int nfs_mount_data_version;
57 extern char *progname;
60 static const unsigned int probe_udp_only[] = {
65 static const unsigned int probe_udp_first[] = {
71 static const unsigned int probe_tcp_first[] = {
77 static const unsigned long probe_nfs2_only[] = {
82 static const unsigned long probe_nfs3_first[] = {
88 static const unsigned long probe_mnt1_first[] = {
94 static const unsigned long probe_mnt3_first[] = {
101 int nfs_gethostbyname(const char *hostname, struct sockaddr_in *saddr)
105 saddr->sin_family = AF_INET;
106 if (!inet_aton(hostname, &saddr->sin_addr)) {
107 if ((hp = gethostbyname(hostname)) == NULL) {
108 nfs_error(_("%s: can't get address for %s\n"),
112 if (hp->h_length > sizeof(*saddr)) {
113 nfs_error(_("%s: got bad hp->h_length\n"),
115 hp->h_length = sizeof(*saddr);
117 memcpy(&saddr->sin_addr, hp->h_addr, hp->h_length);
124 * getport() is very similar to pmap_getport() with
125 * the exception this version uses a non-reserve ports
126 * instead of reserve ports since reserve ports
127 * are not needed for pmap requests.
129 unsigned short getport(struct sockaddr_in *saddr, unsigned long prog,
130 unsigned long vers, unsigned int prot)
132 unsigned short port = 0;
138 saddr->sin_port = htons(PMAPPORT);
141 * Try to get a socket with a non-privileged port.
142 * clnt*create() will create one anyway if this
145 socket = get_socket(saddr, proto, FALSE, FALSE);
146 if (socket == RPC_ANYSOCK) {
147 if (proto == IPPROTO_TCP && errno == ETIMEDOUT) {
149 * TCP SYN timed out, so exit now.
151 rpc_createerr.cf_stat = RPC_TIMEDOUT;
158 clnt = clntudp_bufcreate(saddr,
159 PMAPPROG, PMAPVERS, TIMEOUT, &socket,
160 UDPMSGSIZE, UDPMSGSIZE);
163 clnt = clnttcp_create(saddr,
164 PMAPPROG, PMAPVERS, &socket, 50, 500);
168 parms.pm_prog = prog;
169 parms.pm_vers = vers;
170 parms.pm_prot = prot;
171 parms.pm_port = 0; /* not needed or used */
173 stat = clnt_call(clnt, PMAPPROC_GETPORT, (xdrproc_t)xdr_pmap,
174 (caddr_t)&parms, (xdrproc_t)xdr_u_short, (caddr_t)&port, TIMEOUT);
176 clnt_geterr(clnt, &rpc_createerr.cf_error);
177 rpc_createerr.cf_stat = stat;
180 if (stat != RPC_SUCCESS)
183 rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
192 * Use the portmapper to discover whether or not the service we want is
193 * available. The lists 'versions' and 'protos' define ordered sequences
194 * of service versions and udp/tcp protocols to probe for.
196 static int probe_port(clnt_addr_t *server, const unsigned long *versions,
197 const unsigned int *protos)
199 struct sockaddr_in *saddr = &server->saddr;
200 struct pmap *pmap = &server->pmap;
201 const unsigned long prog = pmap->pm_prog, *p_vers;
202 const unsigned int prot = (u_int)pmap->pm_prot, *p_prot;
203 const u_short port = (u_short) pmap->pm_port;
204 unsigned long vers = pmap->pm_vers;
205 unsigned short p_port;
207 p_prot = prot ? &prot : protos;
208 p_vers = vers ? &vers : versions;
209 rpc_createerr.cf_stat = 0;
211 saddr->sin_port = htons(PMAPPORT);
212 p_port = getport(saddr, prog, *p_vers, *p_prot);
214 if (!port || port == p_port) {
215 saddr->sin_port = htons(p_port);
217 printf(_("%s: trying %s prog %ld vers "
218 "%ld prot %s port %d\n"),
220 inet_ntoa(saddr->sin_addr),
222 *p_prot == IPPROTO_UDP ?
226 if (clnt_ping(saddr, prog, *p_vers, *p_prot, NULL))
228 if (rpc_createerr.cf_stat == RPC_TIMEDOUT)
232 if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED)
240 if (vers == pmap->pm_vers) {
244 if (vers || !*++p_vers)
253 pmap->pm_vers = *p_vers;
255 pmap->pm_prot = *p_prot;
257 pmap->pm_port = p_port;
258 rpc_createerr.cf_stat = 0;
262 static int probe_nfsport(clnt_addr_t *nfs_server)
264 struct pmap *pmap = &nfs_server->pmap;
266 if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
269 if (nfs_mount_data_version >= 4)
270 return probe_port(nfs_server, probe_nfs3_first, probe_tcp_first);
272 return probe_port(nfs_server, probe_nfs2_only, probe_udp_only);
275 static int probe_mntport(clnt_addr_t *mnt_server)
277 struct pmap *pmap = &mnt_server->pmap;
279 if (pmap->pm_vers && pmap->pm_prot && pmap->pm_port)
282 if (nfs_mount_data_version >= 4)
283 return probe_port(mnt_server, probe_mnt3_first, probe_udp_first);
285 return probe_port(mnt_server, probe_mnt1_first, probe_udp_only);
288 int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
290 struct pmap *nfs_pmap = &nfs_server->pmap;
291 struct pmap *mnt_pmap = &mnt_server->pmap;
292 struct pmap save_nfs, save_mnt;
294 const unsigned long *probe_vers;
296 if (mnt_pmap->pm_vers && !nfs_pmap->pm_vers)
297 nfs_pmap->pm_vers = mntvers_to_nfs(mnt_pmap->pm_vers);
298 else if (nfs_pmap->pm_vers && !mnt_pmap->pm_vers)
299 mnt_pmap->pm_vers = nfsvers_to_mnt(nfs_pmap->pm_vers);
300 if (nfs_pmap->pm_vers)
303 memcpy(&save_nfs, nfs_pmap, sizeof(save_nfs));
304 memcpy(&save_mnt, mnt_pmap, sizeof(save_mnt));
305 probe_vers = (nfs_mount_data_version >= 4) ?
306 probe_mnt3_first : probe_mnt1_first;
308 for (; *probe_vers; probe_vers++) {
309 nfs_pmap->pm_vers = mntvers_to_nfs(*probe_vers);
310 if ((res = probe_nfsport(nfs_server) != 0)) {
311 mnt_pmap->pm_vers = nfsvers_to_mnt(nfs_pmap->pm_vers);
312 if ((res = probe_mntport(mnt_server)) != 0)
314 memcpy(mnt_pmap, &save_mnt, sizeof(*mnt_pmap));
316 switch (rpc_createerr.cf_stat) {
317 case RPC_PROGVERSMISMATCH:
318 case RPC_PROGNOTREGISTERED:
323 memcpy(nfs_pmap, &save_nfs, sizeof(*nfs_pmap));
330 if (!probe_nfsport(nfs_server))
332 return probe_mntport(mnt_server);
335 static int probe_statd(void)
337 struct sockaddr_in addr;
340 memset(&addr, 0, sizeof(addr));
341 addr.sin_family = AF_INET;
342 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
343 port = getport(&addr, 100024, 1, IPPROTO_UDP);
347 addr.sin_port = htons(port);
349 if (clnt_ping(&addr, 100024, 1, IPPROTO_UDP, NULL) <= 0)
356 * Attempt to start rpc.statd
358 int start_statd(void)
368 if (stat(START_STATD, &stb) == 0) {
369 if (S_ISREG(stb.st_mode) && (stb.st_mode & S_IXUSR)) {
381 * nfs_call_umount - ask the server to remove a share from it's rmtab
382 * @mnt_server: address of RPC MNT program server
383 * @argp: directory path of share to "unmount"
385 * Returns one if the unmount call succeeded; zero if the unmount
386 * failed for any reason.
388 * Note that a side effect of calling this function is that rpccreateerr
391 int nfs_call_umount(clnt_addr_t *mnt_server, dirpath *argp)
394 enum clnt_stat res = 0;
397 switch (mnt_server->pmap.pm_vers) {
401 if (!probe_mntport(mnt_server))
403 clnt = mnt_openclnt(mnt_server, &msock);
406 res = clnt_call(clnt, MOUNTPROC_UMNT,
407 (xdrproc_t)xdr_dirpath, (caddr_t)argp,
408 (xdrproc_t)xdr_void, NULL,
410 mnt_closeclnt(clnt, msock);
411 if (res == RPC_SUCCESS)
419 if (res == RPC_SUCCESS)