#include <netinet/in.h>
#include <arpa/inet.h>
+#include "sockaddr.h"
#include "xcommon.h"
#include "mount.h"
#include "nls.h"
+#include "nfsrpc.h"
#include "mount_constants.h"
#include "stropts.h"
#include "error.h"
#include "parse_opt.h"
#include "version.h"
#include "parse_dev.h"
+#include "conffile.h"
+
+#ifndef HAVE_DECL_AI_ADDRCONFIG
+#define AI_ADDRCONFIG 0
+#endif
#ifndef NFS_PROGRAM
#define NFS_PROGRAM (100003)
*node, /* mounted-on dir */
*type; /* "nfs" or "nfs4" */
char *hostname; /* server's hostname */
+ struct addrinfo *address; /* server's addresses */
struct mount_options *options; /* parsed mount options */
char **extra_opts; /* string for /etc/mtab */
+ unsigned long version; /* NFS version */
int flags, /* MS_ flags */
fake, /* actually do the mount? */
child; /* forked bg child? */
};
+#ifdef MOUNT_CONFIG
+static void nfs_default_version(struct nfsmount_info *mi);
+
+static void nfs_default_version(struct nfsmount_info *mi)
+{
+ extern unsigned long config_default_vers;
+ /*
+ * Use the default value set in the config file when
+ * the version has not been explicitly set.
+ */
+ if (mi->version == 0 && config_default_vers) {
+ if (config_default_vers < 4)
+ mi->version = config_default_vers;
+ }
+}
+#else
+inline void nfs_default_version(struct nfsmount_info *mi) {}
+#endif /* MOUNT_CONFIG */
+
/*
* Obtain a retry timeout value based on the value of the "retry=" option.
*
socklen_t salen,
struct mount_options *options)
{
- struct sockaddr_storage dummy;
- struct sockaddr *my_addr = (struct sockaddr *)&dummy;
- socklen_t my_len = sizeof(dummy);
+ union nfs_sockaddr address;
+ struct sockaddr *my_addr = &address.sa;
+ socklen_t my_len = sizeof(address);
if (po_contains(options, "clientaddr") == PO_FOUND)
return 1;
}
/*
- * Resolve the 'mounthost=' hostname and append a new option using
- * the resulting address.
+ * Determine whether to append a 'mountaddr=' option. The option is needed if:
+ *
+ * 1. "mounthost=" was specified, or
+ * 2. The address families for proto= and mountproto= are different.
*/
-static int nfs_fix_mounthost_option(struct mount_options *options)
+static int nfs_fix_mounthost_option(struct mount_options *options,
+ const char *nfs_hostname)
{
- struct sockaddr_storage dummy;
- struct sockaddr *sap = (struct sockaddr *)&dummy;
- socklen_t salen = sizeof(dummy);
+ union nfs_sockaddr address;
+ struct sockaddr *sap = &address.sa;
+ socklen_t salen = sizeof(address);
+ sa_family_t nfs_family, mnt_family;
char *mounthost;
+ if (!nfs_nfs_proto_family(options, &nfs_family))
+ return 0;
+ if (!nfs_mount_proto_family(options, &mnt_family))
+ return 0;
+
mounthost = po_get(options, "mounthost");
- if (!mounthost)
- return 1;
+ if (mounthost == NULL) {
+ if (nfs_family == mnt_family)
+ return 1;
+ mounthost = (char *)nfs_hostname;
+ }
- if (!nfs_name_to_address(mounthost, sap, &salen)) {
+ if (!nfs_lookup(mounthost, mnt_family, sap, &salen)) {
nfs_error(_("%s: unable to determine mount server's address"),
progname);
return 0;
return 1;
}
+static int nfs_set_version(struct nfsmount_info *mi)
+{
+ if (!nfs_nfs_version(mi->options, &mi->version))
+ return 0;
+
+ if (strncmp(mi->type, "nfs4", 4) == 0)
+ mi->version = 4;
+
+ /*
+ * Before 2.6.32, the kernel NFS client didn't
+ * support "-t nfs vers=4" mounts, so NFS version
+ * 4 cannot be included when autonegotiating
+ * while running on those kernels.
+ */
+ if (mi->version == 0 &&
+ linux_version_code() <= MAKE_VERSION(2, 6, 31))
+ mi->version = 3;
+
+ /*
+ * If we still don't know, check for version-specific
+ * mount options.
+ */
+ if (mi->version == 0) {
+ if (po_contains(mi->options, "mounthost") ||
+ po_contains(mi->options, "mountaddr") ||
+ po_contains(mi->options, "mountvers") ||
+ po_contains(mi->options, "mountproto"))
+ mi->version = 3;
+ }
+
+ /*
+ * If enabled, see if the default version was
+ * set in the config file
+ */
+ nfs_default_version(mi);
+
+ return 1;
+}
+
/*
- * Set up mandatory NFS mount options.
+ * Set up mandatory non-version specific NFS mount options.
*
* Returns 1 if successful; otherwise zero.
*/
static int nfs_validate_options(struct nfsmount_info *mi)
{
- struct sockaddr_storage dummy;
- struct sockaddr *sap = (struct sockaddr *)&dummy;
- socklen_t salen = sizeof(dummy);
+ struct addrinfo hint = {
+ .ai_protocol = (int)IPPROTO_UDP,
+ .ai_flags = AI_ADDRCONFIG,
+ };
+ sa_family_t family;
+ int error;
if (!nfs_parse_devname(mi->spec, &mi->hostname, NULL))
return 0;
- if (!nfs_name_to_address(mi->hostname, sap, &salen))
+ if (!nfs_nfs_proto_family(mi->options, &family))
return 0;
- if (strncmp(mi->type, "nfs4", 4) == 0) {
- if (!nfs_append_clientaddr_option(sap, salen, mi->options))
- return 0;
- } else {
- if (!nfs_fix_mounthost_option(mi->options))
- return 0;
- if (!mi->fake && !nfs_verify_lock_option(mi->options))
- return 0;
+ hint.ai_family = (int)family;
+ error = getaddrinfo(mi->hostname, NULL, &hint, &mi->address);
+ if (error != 0) {
+ nfs_error(_("%s: Failed to resolve server %s: %s"),
+ progname, mi->hostname, gai_strerror(error));
+ mi->address = NULL;
+ return 0;
}
- if (!nfs_append_sloppy_option(mi->options))
+ if (!nfs_set_version(mi))
return 0;
- if (!nfs_append_addr_option(sap, salen, mi->options))
+ if (!nfs_append_sloppy_option(mi->options))
return 0;
- /*
- * Update option string to be recorded in /etc/mnttab
- */
- if (po_join(mi->options, mi->extra_opts) == PO_FAILED)
+ if (!nfs_append_addr_option(mi->address->ai_addr,
+ mi->address->ai_addrlen, mi->options))
return 0;
return 1;
}
static int nfs_construct_new_options(struct mount_options *options,
+ struct sockaddr *nfs_saddr,
struct pmap *nfs_pmap,
+ struct sockaddr *mnt_saddr,
struct pmap *mnt_pmap)
{
char new_option[64];
+ char *netid;
po_remove_all(options, "nfsprog");
po_remove_all(options, "mountprog");
po_remove_all(options, "proto");
po_remove_all(options, "udp");
po_remove_all(options, "tcp");
- switch (nfs_pmap->pm_prot) {
- case IPPROTO_TCP:
- snprintf(new_option, sizeof(new_option) - 1,
- "proto=tcp");
- if (po_append(options, new_option) == PO_FAILED)
- return 0;
- break;
- case IPPROTO_UDP:
- snprintf(new_option, sizeof(new_option) - 1,
- "proto=udp");
- if (po_append(options, new_option) == PO_FAILED)
- return 0;
- break;
- }
+ netid = nfs_get_netid(nfs_saddr->sa_family, nfs_pmap->pm_prot);
+ if (netid == NULL)
+ return 0;
+ snprintf(new_option, sizeof(new_option) - 1,
+ "proto=%s", netid);
+ free(netid);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
po_remove_all(options, "port");
if (nfs_pmap->pm_port != NFS_PORT) {
return 0;
po_remove_all(options, "mountproto");
- switch (mnt_pmap->pm_prot) {
- case IPPROTO_TCP:
- snprintf(new_option, sizeof(new_option) - 1,
- "mountproto=tcp");
- if (po_append(options, new_option) == PO_FAILED)
- return 0;
- break;
- case IPPROTO_UDP:
- snprintf(new_option, sizeof(new_option) - 1,
- "mountproto=udp");
- if (po_append(options, new_option) == PO_FAILED)
- return 0;
- break;
- }
+ netid = nfs_get_netid(mnt_saddr->sa_family, mnt_pmap->pm_prot);
+ if (netid == NULL)
+ return 0;
+ snprintf(new_option, sizeof(new_option) - 1,
+ "mountproto=%s", netid);
+ free(netid);
+ if (po_append(options, new_option) == PO_FAILED)
+ return 0;
po_remove_all(options, "mountport");
snprintf(new_option, sizeof(new_option) - 1,
static int
nfs_rewrite_pmap_mount_options(struct mount_options *options)
{
- struct sockaddr_storage nfs_address;
- struct sockaddr *nfs_saddr = (struct sockaddr *)&nfs_address;
+ union nfs_sockaddr nfs_address;
+ struct sockaddr *nfs_saddr = &nfs_address.sa;
socklen_t nfs_salen = sizeof(nfs_address);
struct pmap nfs_pmap;
- struct sockaddr_storage mnt_address;
- struct sockaddr *mnt_saddr = (struct sockaddr *)&mnt_address;
+ union nfs_sockaddr mnt_address;
+ struct sockaddr *mnt_saddr = &mnt_address.sa;
socklen_t mnt_salen = sizeof(mnt_address);
+ unsigned long protocol;
struct pmap mnt_pmap;
- char *option;
/*
- * Skip option negotiation for proto=rdma mounts.
+ * Version and transport negotiation is not required
+ * and does not work for RDMA mounts.
*/
- option = po_get(options, "proto");
- if (option && strcmp(option, "rdma") == 0)
+ if (!nfs_nfs_protocol(options, &protocol)) {
+ errno = EINVAL;
+ return 0;
+ }
+ if (protocol == NFSPROTO_RDMA)
goto out;
/*
if (!nfs_probe_bothports(mnt_saddr, mnt_salen, &mnt_pmap,
nfs_saddr, nfs_salen, &nfs_pmap)) {
errno = ESPIPE;
+ if (rpc_createerr.cf_stat == RPC_PROGNOTREGISTERED)
+ errno = EOPNOTSUPP;
+ else if (rpc_createerr.cf_error.re_errno != 0)
+ errno = rpc_createerr.cf_error.re_errno;
return 0;
}
- if (!nfs_construct_new_options(options, &nfs_pmap, &mnt_pmap)) {
- errno = EINVAL;
+ if (!nfs_construct_new_options(options, nfs_saddr, &nfs_pmap,
+ mnt_saddr, &mnt_pmap)) {
+ if (rpc_createerr.cf_stat == RPC_UNKNOWNPROTO)
+ errno = EPROTONOSUPPORT;
+ else
+ errno = EINVAL;
return 0;
}
* Returns TRUE if successful, otherwise FALSE.
* "errno" is set to reflect the individual error.
*/
-static int nfs_try_mount(struct nfsmount_info *mi)
+static int nfs_sys_mount(struct nfsmount_info *mi, struct mount_options *opts)
{
char *options = NULL;
int result;
- if (strncmp(mi->type, "nfs4", 4) != 0) {
- if (!nfs_rewrite_pmap_mount_options(mi->options))
- return 0;
- }
-
- if (po_join(mi->options, &options) == PO_FAILED) {
+ if (po_join(opts, &options) == PO_FAILED) {
errno = EIO;
return 0;
}
- if (verbose)
- printf(_("%s: trying text-based options '%s'\n"),
- progname, options);
-
if (mi->fake)
return 1;
return !result;
}
+static int nfs_do_mount_v3v2(struct nfsmount_info *mi,
+ struct sockaddr *sap, socklen_t salen)
+{
+ struct mount_options *options = po_dup(mi->options);
+ int result = 0;
+
+ if (!options) {
+ errno = ENOMEM;
+ return result;
+ }
+ errno = 0;
+ if (!nfs_append_addr_option(sap, salen, options)) {
+ if (errno == 0)
+ errno = EINVAL;
+ goto out_fail;
+ }
+
+ if (!nfs_fix_mounthost_option(options, mi->hostname)) {
+ if (errno == 0)
+ errno = EINVAL;
+ goto out_fail;
+ }
+ if (!mi->fake && !nfs_verify_lock_option(options)) {
+ if (errno == 0)
+ errno = EINVAL;
+ goto out_fail;
+ }
+
+ /*
+ * Options we negotiate below may be stale by the time this
+ * file system is unmounted. In order to force umount.nfs
+ * to renegotiate with the server, only write the user-
+ * specified options, and not negotiated options, to /etc/mtab.
+ */
+ if (po_join(options, mi->extra_opts) == PO_FAILED) {
+ errno = ENOMEM;
+ goto out_fail;
+ }
+
+ if (verbose)
+ printf(_("%s: trying text-based options '%s'\n"),
+ progname, *mi->extra_opts);
+
+ if (!nfs_rewrite_pmap_mount_options(options))
+ goto out_fail;
+
+ result = nfs_sys_mount(mi, options);
+
+out_fail:
+ po_destroy(options);
+ return result;
+}
+
+/*
+ * Attempt a "-t nfs vers=2" or "-t nfs vers=3" mount.
+ *
+ * Returns TRUE if successful, otherwise FALSE.
+ * "errno" is set to reflect the individual error.
+ */
+static int nfs_try_mount_v3v2(struct nfsmount_info *mi)
+{
+ struct addrinfo *ai;
+ int ret;
+
+ for (ai = mi->address; ai != NULL; ai = ai->ai_next) {
+ ret = nfs_do_mount_v3v2(mi, ai->ai_addr, ai->ai_addrlen);
+ if (ret != 0)
+ return ret;
+
+ switch (errno) {
+ case ECONNREFUSED:
+ case EOPNOTSUPP:
+ case EHOSTUNREACH:
+ continue;
+ default:
+ break;
+ }
+ }
+ return ret;
+}
+
+static int nfs_do_mount_v4(struct nfsmount_info *mi,
+ struct sockaddr *sap, socklen_t salen)
+{
+ struct mount_options *options = po_dup(mi->options);
+ int result = 0;
+
+ if (!options) {
+ errno = ENOMEM;
+ return result;
+ }
+
+ if (mi->version == 0) {
+ if (po_contains(options, "mounthost") ||
+ po_contains(options, "mountaddr") ||
+ po_contains(options, "mountvers") ||
+ po_contains(options, "mountproto")) {
+ /*
+ * Since these mountd options are set assume version 3
+ * is wanted so error out with EPROTONOSUPPORT so the
+ * protocol negation starts with v3.
+ */
+ errno = EPROTONOSUPPORT;
+ goto out_fail;
+ }
+ if (po_append(options, "vers=4") == PO_FAILED) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+ }
+
+ if (!nfs_append_addr_option(sap, salen, options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+
+ if (!nfs_append_clientaddr_option(sap, salen, options)) {
+ errno = EINVAL;
+ goto out_fail;
+ }
+
+ /*
+ * Update option string to be recorded in /etc/mtab.
+ */
+ if (po_join(options, mi->extra_opts) == PO_FAILED) {
+ errno = ENOMEM;
+ goto out_fail;
+ }
+
+ if (verbose)
+ printf(_("%s: trying text-based options '%s'\n"),
+ progname, *mi->extra_opts);
+
+ result = nfs_sys_mount(mi, options);
+
+out_fail:
+ po_destroy(options);
+ return result;
+}
+
+/*
+ * Attempt a "-t nfs -o vers=4" or "-t nfs4" mount.
+ *
+ * Returns TRUE if successful, otherwise FALSE.
+ * "errno" is set to reflect the individual error.
+ */
+static int nfs_try_mount_v4(struct nfsmount_info *mi)
+{
+ struct addrinfo *ai;
+ int ret;
+
+ for (ai = mi->address; ai != NULL; ai = ai->ai_next) {
+ ret = nfs_do_mount_v4(mi, ai->ai_addr, ai->ai_addrlen);
+ if (ret != 0)
+ return ret;
+
+ switch (errno) {
+ case ECONNREFUSED:
+ case EHOSTUNREACH:
+ continue;
+ default:
+ break;
+ }
+ }
+ return ret;
+}
+
+/*
+ * Handle NFS version and transport protocol
+ * autonegotiation.
+ *
+ * When no version or protocol is specified on the
+ * command line, mount.nfs negotiates with the server
+ * to determine appropriate settings for the new
+ * mount point.
+ *
+ * Returns TRUE if successful, otherwise FALSE.
+ * "errno" is set to reflect the individual error.
+ */
+static int nfs_autonegotiate(struct nfsmount_info *mi)
+{
+ int result;
+
+ result = nfs_try_mount_v4(mi);
+ if (result)
+ return result;
+
+ switch (errno) {
+ case EPROTONOSUPPORT:
+ /* A clear indication that the server or our
+ * client does not support NFS version 4. */
+ goto fall_back;
+ case ENOENT:
+ /* Legacy Linux servers don't export an NFS
+ * version 4 pseudoroot. */
+ goto fall_back;
+ case EPERM:
+ /* Linux servers prior to 2.6.25 may return
+ * EPERM when NFS version 4 is not supported. */
+ goto fall_back;
+ default:
+ return result;
+ }
+
+fall_back:
+ return nfs_try_mount_v3v2(mi);
+}
+
+/*
+ * This is a single pass through the fg/bg loop.
+ *
+ * Returns TRUE if successful, otherwise FALSE.
+ * "errno" is set to reflect the individual error.
+ */
+static int nfs_try_mount(struct nfsmount_info *mi)
+{
+ int result = 0;
+
+ switch (mi->version) {
+ case 0:
+ result = nfs_autonegotiate(mi);
+ break;
+ case 2:
+ case 3:
+ result = nfs_try_mount_v3v2(mi);
+ break;
+ case 4:
+ result = nfs_try_mount_v4(mi);
+ break;
+ default:
+ errno = EIO;
+ }
+
+ return result;
+}
+
/*
* Distinguish between permanent and temporary errors.
*
case ESTALE:
case ETIMEDOUT:
case ECONNREFUSED:
+ case EHOSTUNREACH:
return 0; /* temporary */
default:
return 1; /* permanent */
return nfsmount_child(mi);
}
+/*
+ * Usually all that is needed for an NFS remount is to change
+ * generic mount options like "sync" or "ro". These generic
+ * options are controlled by mi->flags, not by text-based
+ * options, and no contact with the server is needed.
+ *
+ * Take care with the /etc/mtab entry for this mount; just
+ * calling update_mtab() will change an "-t nfs -o vers=4"
+ * mount to an "-t nfs -o remount" mount, and that will
+ * confuse umount.nfs.
+ *
+ * Returns a valid mount command exit code.
+ */
+static int nfs_remount(struct nfsmount_info *mi)
+{
+ if (nfs_sys_mount(mi, mi->options))
+ return EX_SUCCESS;
+ return EX_FAIL;
+}
+
/*
* Process mount options and try a mount system call.
*
if (!nfs_validate_options(mi))
return EX_FAIL;
+ /*
+ * Avoid retry and negotiation logic when remounting
+ */
+ if (mi->flags & MS_REMOUNT)
+ return nfs_remount(mi);
+
if (po_rightmost(mi->options, nfs_background_opttbl) == 0)
return nfsmount_bg(mi);
else
* (input and output argument)
* @fake: flag indicating whether to carry out the whole operation
* @child: one if this is a mount daemon (bg)
+ *
+ * Returns a valid mount command exit code.
*/
int nfsmount_string(const char *spec, const char *node, const char *type,
int flags, char **extra_opts, int fake, int child)
struct nfsmount_info mi = {
.spec = spec,
.node = node,
+ .address = NULL,
.type = type,
.extra_opts = extra_opts,
.flags = flags,
} else
nfs_error(_("%s: internal option parsing error"), progname);
+ freeaddrinfo(mi.address);
free(mi.hostname);
return retval;
}
projects / nfs-utils.git / blobdiff