2 * stropts.c -- NFS mount using C string to pass options to kernel
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.
32 #include <sys/socket.h>
33 #include <sys/mount.h>
38 #include "nfs_mount.h"
39 #include "mount_constants.h"
44 #ifdef HAVE_RPCSVC_NFS_PROT_H
45 #include <rpcsvc/nfs_prot.h>
47 #include <linux/nfs.h>
48 #define nfsstat nfs_stat
55 #ifndef NFS_MAXHOSTNAME
56 #define NFS_MAXHOSTNAME (255)
59 #ifndef NFS_MAXPATHNAME
60 #define NFS_MAXPATHNAME (1024)
63 extern int nfs_mount_data_version;
64 extern char *progname;
67 static int retry_opt = 10000; /* 10,000 minutes ~= 1 week */
68 static int bg_opt = 0;
69 static int addr_opt = 0;
70 static int ca_opt = 0;
72 static int parse_devname(const char *spec, char **hostname)
75 char *dev, *pathname, *s;
79 if (!(pathname = strchr(dev, ':'))) {
80 nfs_error(_("%s: remote share not in 'host:dir' format"),
88 * We don't need a copy of the pathname, but let's
89 * sanity check it anyway.
91 if (strlen(pathname) > NFS_MAXPATHNAME) {
92 nfs_error(_("%s: export pathname is too long"),
98 * Ignore all but first hostname in replicated mounts
99 * until they can be fully supported. (mack@sgi.com)
101 if ((s = strchr(dev, ','))) {
103 nfs_error(_("%s: warning: multiple hostnames not supported"),
105 nfs_error(_("%s: ignoring hostnames that follow the first one"),
108 *hostname = xstrdup(dev);
109 if (strlen(*hostname) > NFS_MAXHOSTNAME) {
110 nfs_error(_("%s: server hostname is too long"),
123 static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
126 addr->sin_family = AF_INET;
128 if (inet_aton(hostname, &addr->sin_addr))
130 if ((hp = gethostbyname(hostname)) == NULL) {
131 nfs_error(_("%s: can't get address for %s\n"),
135 if (hp->h_length > sizeof(struct in_addr)) {
136 nfs_error(_("%s: got bad hp->h_length"), progname);
137 hp->h_length = sizeof(struct in_addr);
139 memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);
144 * XXX: This should really use the technique neil recently added
145 * to get the address off the local end of a socket connected to
146 * the server -- to get the right address to use on multi-homed
149 static int get_my_ipv4addr(char *ip_addr, int len)
152 struct sockaddr_in myaddr;
154 if (gethostname(myname, sizeof(myname))) {
155 nfs_error(_("%s: can't determine client address\n"),
159 if (!fill_ipv4_sockaddr(myname, &myaddr))
162 snprintf(ip_addr, len, "%s", inet_ntoa(myaddr.sin_addr));
163 ip_addr[len - 1] = '\0';
169 * Walk through our mount options string, and indicate the presence
170 * of 'bg', 'retry=', 'addr=', and 'clientaddr='.
172 static void extract_interesting_options(char *opts)
177 opts = xstrdup(opts);
179 for (opt = strtok(opts, ","); opt; opt = strtok(NULL, ",")) {
180 if ((opteq = strchr(opt, '='))) {
181 val = atoi(opteq + 1);
183 if (strcmp(opt, "bg") == 0)
185 else if (strcmp(opt, "retry") == 0)
187 else if (strcmp(opt, "addr") == 0)
189 else if (strcmp(opt, "clientaddr") == 0)
192 if (strcmp(opt, "bg") == 0)
201 * Append the 'addr=' option to the options string. The server
202 * address is added to /etc/mtab for use when unmounting.
204 * Returns 1 if 'addr=' option created successfully;
207 static int append_addr_opt(const char *spec, char **extra_opts)
209 static char new_opts[1024];
210 char *hostname, *s, *old_opts;
211 struct sockaddr_in addr;
214 if (!parse_devname(spec, &hostname))
217 err = fill_ipv4_sockaddr(hostname, &addr);
222 s = inet_ntoa(addr.sin_addr);
223 old_opts = *extra_opts;
226 if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
227 nfs_error(_("%s: excessively long option argument\n"),
231 snprintf(new_opts, sizeof(new_opts), "%s%saddr=%s",
232 old_opts, *old_opts ? "," : "", s);
233 *extra_opts = xstrdup(new_opts);
239 * Append the 'clientaddr=' option to the options string.
241 * Returns 1 if 'clientaddr=' option created successfully;
244 static int append_clientaddr_opt(const char *spec, char **extra_opts)
246 static char new_opts[1024], cbuf[1024];
247 static char ip_addr[16] = "127.0.0.1";
249 if (!get_my_ipv4addr(ip_addr, sizeof(ip_addr)))
252 /* Ensure we have enough padding for the following strcat()s */
253 if (strlen(*extra_opts) + strlen(ip_addr) + 10 >= sizeof(new_opts)) {
254 nfs_error(_("%s: excessively long option argument"),
259 strcat(new_opts, *extra_opts);
261 snprintf(cbuf, sizeof(cbuf) - 1, "%sclientaddr=%s",
262 *extra_opts ? "," : "", ip_addr);
263 strcat(new_opts, cbuf);
265 *extra_opts = xstrdup(new_opts);
271 * nfsmount_s - Mount an NFSv2 or v3 file system using C string options
273 * @spec: C string hostname:path specifying remoteshare to mount
274 * @node: C string pathname of local mounted on directory
275 * @flags: MS_ style flags
276 * @extra_opts: pointer to C string containing fs-specific mount options
277 * (possibly also a return argument)
278 * @fake: flag indicating whether to carry out the whole operation
279 * @bg: one if this is a backgrounded mount attempt
281 * XXX: need to handle bg, fg, and retry options.
283 int nfsmount_s(const char *spec, const char *node, int flags,
284 char **extra_opts, int fake, int bg)
286 int retval = EX_FAIL;
288 extract_interesting_options(*extra_opts);
290 if (!bg && addr_opt) {
291 nfs_error(_("%s: Illegal option: 'addr='"), progname);
295 if (!append_addr_opt(spec, extra_opts))
299 printf(_("%s: text-based options: '%s'\n"),
300 progname, *extra_opts);
303 if (mount(spec, node, "nfs",
304 flags & ~(MS_USER|MS_USERS), *extra_opts)) {
305 mount_error(spec, node, errno);
317 * nfs4mount_s - Mount an NFSv4 file system using C string options
319 * @spec: C string hostname:path specifying remoteshare to mount
320 * @node: C string pathname of local mounted on directory
321 * @flags: MS_ style flags
322 * @extra_opts: pointer to C string containing fs-specific mount options
323 * (possibly also a return argument)
324 * @fake: flag indicating whether to carry out the whole operation
325 * @child: one if this is a backgrounded mount
327 * XXX: need to handle bg, fg, and retry options.
330 int nfs4mount_s(const char *spec, const char *node, int flags,
331 char **extra_opts, int fake, int child)
333 int retval = EX_FAIL;
335 extract_interesting_options(*extra_opts);
338 nfs_error(_("%s: Illegal option: 'addr='"), progname);
343 nfs_error(_("%s: Illegal option: 'clientaddr='"), progname);
347 if (!append_addr_opt(spec, extra_opts))
350 if (!append_clientaddr_opt(spec, extra_opts))
354 printf(_("%s: text-based options: '%s'\n"),
355 progname, *extra_opts);
358 if (mount(spec, node, "nfs4",
359 flags & ~(MS_USER|MS_USERS), *extra_opts)) {
360 mount_error(spec, node, errno);