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"
43 #ifdef HAVE_RPCSVC_NFS_PROT_H
44 #include <rpcsvc/nfs_prot.h>
46 #include <linux/nfs.h>
47 #define nfsstat nfs_stat
54 extern int nfs_mount_data_version;
55 extern char *progname;
58 static int retry_opt = 10000; /* 10,000 minutes ~= 1 week */
59 static int bg_opt = 0;
60 static int addr_opt = 0;
61 static int ca_opt = 0;
63 static int parse_devname(char *hostdir, char **hostname, char **dirname)
67 if (!(s = strchr(hostdir, ':'))) {
68 nfs_error(_("%s: directory to mount not in host:dir format"),
75 /* Ignore all but first hostname in replicated mounts
76 until they can be fully supported. (mack@sgi.com) */
77 if ((s = strchr(hostdir, ','))) {
79 nfs_error(_("%s: warning: multiple hostnames not supported"),
85 static int fill_ipv4_sockaddr(const char *hostname, struct sockaddr_in *addr)
88 addr->sin_family = AF_INET;
90 if (inet_aton(hostname, &addr->sin_addr))
92 if ((hp = gethostbyname(hostname)) == NULL) {
93 nfs_error(_("%s: can't get address for %s\n"),
97 if (hp->h_length > sizeof(struct in_addr)) {
98 nfs_error(_("%s: got bad hp->h_length"), progname);
99 hp->h_length = sizeof(struct in_addr);
101 memcpy(&addr->sin_addr, hp->h_addr, hp->h_length);
106 * XXX: This should really use the technique neil recently added
107 * to get the address off the local end of a socket connected to
108 * the server -- to get the right address to use on multi-homed
111 static int get_my_ipv4addr(char *ip_addr, int len)
114 struct sockaddr_in myaddr;
116 if (gethostname(myname, sizeof(myname))) {
117 nfs_error(_("%s: can't determine client address\n"),
121 if (!fill_ipv4_sockaddr(myname, &myaddr))
124 snprintf(ip_addr, len, "%s", inet_ntoa(myaddr.sin_addr));
125 ip_addr[len - 1] = '\0';
131 * Walk through our mount options string, and indicate the presence
132 * of 'bg', 'retry=', and 'clientaddr='.
134 static void extract_interesting_options(char *opts)
139 opts = xstrdup(opts);
141 for (opt = strtok(opts, ","); opt; opt = strtok(NULL, ",")) {
142 if ((opteq = strchr(opt, '='))) {
143 val = atoi(opteq + 1);
145 if (strcmp(opt, "bg") == 0)
147 else if (strcmp(opt, "retry") == 0)
149 else if (strcmp(opt, "addr") == 0)
151 else if (strcmp(opt, "clientaddr") == 0)
154 if (strcmp(opt, "bg") == 0)
163 * Append the "addr=" option to the options string.
165 * We always add our own addr= to the end of the options string.
167 static int append_addr_opt(const char *spec, char **extra_opts)
169 static char hostdir[1024], new_opts[1024], ip_addr[255];
170 char *hostname, *dirname, *s, *old_opts;
171 struct sockaddr_in addr;
173 if (strlen(spec) >= sizeof(hostdir)) {
174 nfs_error(_("%s: excessively long host:dir argument\n"),
178 strcpy(hostdir, spec);
179 if (parse_devname(hostdir, &hostname, &dirname)) {
180 nfs_error(_("%s: parsing host:dir argument failed\n"),
185 if (!fill_ipv4_sockaddr(hostname, &addr))
187 if (!get_my_ipv4addr(ip_addr, sizeof(ip_addr)))
190 /* add IP address to mtab options for use when unmounting */
191 s = inet_ntoa(addr.sin_addr);
192 old_opts = *extra_opts;
195 if (strlen(old_opts) + strlen(s) + 10 >= sizeof(new_opts)) {
196 nfs_error(_("%s: excessively long option argument\n"),
200 snprintf(new_opts, sizeof(new_opts), "%s%saddr=%s",
201 old_opts, *old_opts ? "," : "", s);
202 *extra_opts = xstrdup(new_opts);
208 * Append the "clientaddr=" option to the options string.
210 * Returns 1 if clientaddr option created successfully;
213 static int append_clientaddr_opt(const char *spec, char **extra_opts)
215 static char new_opts[1024], cbuf[1024];
216 static char ip_addr[16] = "127.0.0.1";
218 if (!get_my_ipv4addr(ip_addr, sizeof(ip_addr)))
221 /* Ensure we have enough padding for the following strcat()s */
222 if (strlen(*extra_opts) + strlen(ip_addr) + 10 >= sizeof(new_opts)) {
223 nfs_error(_("%s: excessively long option argument"),
228 strcat(new_opts, *extra_opts);
230 snprintf(cbuf, sizeof(cbuf) - 1, "%sclientaddr=%s",
231 *extra_opts ? "," : "", ip_addr);
232 strcat(new_opts, cbuf);
234 *extra_opts = xstrdup(new_opts);
240 * nfsmount_s - Mount an NFSv2 or v3 file system using C string options
242 * @spec: C string hostname:path specifying remoteshare to mount
243 * @node: C string pathname of local mounted on directory
244 * @flags: MS_ style flags
245 * @extra_opts: pointer to C string containing fs-specific mount options
246 * (possibly also a return argument)
247 * @fake: flag indicating whether to carry out the whole operation
248 * @bg: one if this is a backgrounded mount attempt
250 * XXX: need to handle bg, fg, and retry options.
252 int nfsmount_s(const char *spec, const char *node, int flags,
253 char **extra_opts, int fake, int bg)
255 int retval = EX_FAIL;
258 printf(_("%s: using C string mount system call interface\n"),
261 extract_interesting_options(*extra_opts);
263 if (!addr_opt && !append_addr_opt(spec, extra_opts))
267 printf(_("%s: option string is '%s'\n"),
268 progname, *extra_opts);
271 if (mount(spec, node, "nfs",
272 flags & ~(MS_USER|MS_USERS), *extra_opts)) {
273 mount_error(spec, node, errno);
285 * nfs4mount_s - Mount an NFSv4 file system using C string options
287 * @spec: C string hostname:path specifying remoteshare to mount
288 * @node: C string pathname of local mounted on directory
289 * @flags: MS_ style flags
290 * @extra_opts: pointer to C string containing fs-specific mount options
291 * (possibly also a return argument)
292 * @fake: flag indicating whether to carry out the whole operation
293 * @bg: one if this is a backgrounded mount attempt
295 * XXX: need to handle bg, fg, and retry options.
298 int nfs4mount_s(const char *spec, const char *node, int flags,
299 char **extra_opts, int fake)
301 int retval = EX_FAIL;
304 printf(_("%s: using C string mount system call interface\n"),
307 extract_interesting_options(*extra_opts);
309 if (!addr_opt && !append_addr_opt(spec, extra_opts))
312 if (!ca_opt && !append_clientaddr_opt(spec, extra_opts))
316 printf(_("%s: option string is '%s'\n"),
317 progname, *extra_opts);
320 if (mount(spec, node, "nfs4",
321 flags & ~(MS_USER|MS_USERS), *extra_opts)) {
322 mount_error(spec, node, errno);