* Extensive changes, 1999, Neil Brown <neilb@cse.unsw.edu.au>
*/
-#include "config.h"
-
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/vfs.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#include <unistd.h>
+#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <getopt.h>
+#include <fcntl.h>
#include <netdb.h>
#include <errno.h>
-#include "xmalloc.h"
+#include <dirent.h>
+
+#include "sockaddr.h"
#include "misc.h"
#include "nfslib.h"
#include "exportfs.h"
-#include "xmalloc.h"
#include "xlog.h"
static void export_all(int verbose);
-static void unexport_all(int verbose);
static void exportfs(char *arg, char *options, int verbose);
static void unexportfs(char *arg, int verbose);
static void exports_update(int verbose);
static void dump(int verbose);
static void error(nfs_export *exp, int err);
-static void usage(void);
+static void usage(const char *progname, int n);
+static void validate_export(nfs_export *exp);
+static int matchhostname(const char *hostname1, const char *hostname2);
+static void export_d_read(const char *dname);
+static void grab_lockfile(void);
+static void release_lockfile(void);
+static const char *lockfile = EXP_LOCKFILE;
+static int _lockfd = -1;
+
+/*
+ * If we aren't careful, changes made by exportfs can be lost
+ * when multiple exports process run at once:
+ *
+ * exportfs process 1 exportfs process 2
+ * ------------------------------------------
+ * reads etab version A reads etab version A
+ * adds new export B adds new export C
+ * writes A+B writes A+C
+ *
+ * The locking in support/export/xtab.c will prevent mountd from
+ * seeing a partially written version of etab, and will prevent
+ * the two writers above from writing simultaneously and
+ * corrupting etab, but to prevent problems like the above we
+ * need these additional lockfile() routines.
+ */
+static void
+grab_lockfile()
+{
+ _lockfd = open(lockfile, O_CREAT|O_RDWR, 0666);
+ if (_lockfd != -1)
+ lockf(_lockfd, F_LOCK, 0);
+}
+static void
+release_lockfile()
+{
+ if (_lockfd != -1)
+ lockf(_lockfd, F_ULOCK, 0);
+}
int
main(int argc, char **argv)
{
char *options = NULL;
+ char *progname = NULL;
int f_export = 1;
int f_all = 0;
int f_verbose = 0;
int f_reexport = 0;
int f_ignore = 0;
int i, c;
+ int new_cache = 0;
+ int force_flush = 0;
+
+ if ((progname = strrchr(argv[0], '/')) != NULL)
+ progname++;
+ else
+ progname = argv[0];
+
+ xlog_open(progname);
+ xlog_stderr(1);
+ xlog_syslog(0);
- xlog_open("exportfs");
+ export_errno = 0;
- while ((c = getopt(argc, argv, "aio:ruv")) != EOF) {
+ while ((c = getopt(argc, argv, "afhio:ruv")) != EOF) {
switch(c) {
case 'a':
f_all = 1;
break;
+ case 'f':
+ force_flush = 1;
+ break;
+ case 'h':
+ usage(progname, 0);
+ break;
case 'i':
f_ignore = 1;
break;
f_verbose = 1;
break;
default:
- usage();
+ usage(progname, 1);
break;
}
}
if (optind != argc && f_all) {
- fprintf(stderr,"exportfs: extra arguments are not permitted with -a or -r.\n");
+ xlog(L_ERROR, "extra arguments are not permitted with -a or -r");
return 1;
}
if (f_ignore && (f_all || ! f_export)) {
- fprintf(stderr,"exportfs: -i not meaningful with -a, -r or -u.\n");
+ xlog(L_ERROR, "-i not meaningful with -a, -r or -u");
return 1;
}
if (f_reexport && ! f_export) {
- fprintf(stderr, "exportfs: -r and -u are incompatible.\n");
+ xlog(L_ERROR, "-r and -u are incompatible");
return 1;
}
+ new_cache = check_new_cache();
if (optind == argc && ! f_all) {
- xtab_export_read();
- dump(f_verbose);
- return 0;
+ if (force_flush) {
+ if (new_cache)
+ cache_flush(1);
+ else {
+ xlog(L_ERROR, "-f is available only "
+ "with new cache controls. "
+ "Mount /proc/fs/nfsd first");
+ return 1;
+ }
+ return 0;
+ } else {
+ xtab_export_read();
+ dump(f_verbose);
+ return 0;
+ }
}
- if (f_export && ! f_ignore)
+ /*
+ * Serialize things as best we can
+ */
+ grab_lockfile();
+ atexit(release_lockfile);
+
+ if (f_export && ! f_ignore) {
export_read(_PATH_EXPORTS);
+ export_d_read(_PATH_EXPORTS_D);
+ }
if (f_export) {
if (f_all)
export_all(f_verbose);
for (i = optind; i < argc ; i++)
exportfs(argv[i], options, f_verbose);
}
- /* note: xtab_*_read does not update entries if they already exist,
- * so this will not lose new options
+ /* If we are unexporting everything, then
+ * don't care about what should be exported, as that
+ * may require DNS lookups..
*/
- if (!f_reexport)
- xtab_export_read();
- if (!f_export) {
- if (f_all)
- unexport_all(f_verbose);
- else
+ if (! ( !f_export && f_all)) {
+ /* note: xtab_*_read does not update entries if they already exist,
+ * so this will not lose new options
+ */
+ if (!f_reexport)
+ xtab_export_read();
+ if (!f_export)
for (i = optind ; i < argc ; i++)
unexportfs(argv[i], f_verbose);
+ if (!new_cache)
+ rmtab_read();
+ }
+ if (!new_cache) {
+ xtab_mount_read();
+ exports_update(f_verbose);
}
- rmtab_read();
- xtab_mount_read();
- exports_update(f_verbose);
xtab_export_write();
- xtab_mount_write();
+ if (new_cache)
+ cache_flush(force_flush);
+ if (!new_cache)
+ xtab_mount_write();
+
+ return export_errno;
+}
- return 0;
+static void
+exports_update_one(nfs_export *exp, int verbose)
+{
+ /* check mountpoint option */
+ if (exp->m_mayexport &&
+ exp->m_export.e_mountpoint &&
+ !is_mountpoint(exp->m_export.e_mountpoint[0]?
+ exp->m_export.e_mountpoint:
+ exp->m_export.e_path)) {
+ printf("%s not exported as %s not a mountpoint.\n",
+ exp->m_export.e_path, exp->m_export.e_mountpoint);
+ exp->m_mayexport = 0;
+ }
+ if (exp->m_mayexport && ((exp->m_exported<1) || exp->m_changed)) {
+ if (verbose)
+ printf("%sexporting %s:%s to kernel\n",
+ exp->m_exported ?"re":"",
+ exp->m_client->m_hostname,
+ exp->m_export.e_path);
+ if (!export_export(exp))
+ error(exp, errno);
+ }
+ if (exp->m_exported && ! exp->m_mayexport) {
+ if (verbose)
+ printf("unexporting %s:%s from kernel\n",
+ exp->m_client->m_hostname,
+ exp->m_export.e_path);
+ if (!export_unexport(exp))
+ error(exp, errno);
+ }
}
+
/* we synchronise intention with reality.
* entries with m_mayexport get exported
* entries with m_exported but not m_mayexport get unexported
- * looking at m_client->m_type == MCL_FQDN only
+ * looking at m_client->m_type == MCL_FQDN and m_client->m_type == MCL_GSS only
*/
static void
exports_update(int verbose)
{
nfs_export *exp;
- for (exp = exportlist[MCL_FQDN]; exp; exp=exp->m_next) {
- if (exp->m_mayexport && (!exp->m_exported || exp->m_changed)) {
- if (verbose)
- printf("%sexporting %s:%s to kernel\n",
- exp->m_exported ?"re":"",
- exp->m_client->m_hostname,
- exp->m_export.e_path);
- if (!export_export(exp))
- error(exp, errno);
- }
- if (exp->m_exported && ! exp->m_mayexport) {
- if (verbose)
- printf("unexporting %s:%s from kernel\n",
- exp->m_client->m_hostname,
- exp->m_export.e_path);
- if (!export_unexport(exp))
- error(exp, errno);
- }
+ for (exp = exportlist[MCL_FQDN].p_head; exp; exp=exp->m_next) {
+ exports_update_one(exp, verbose);
+ }
+ for (exp = exportlist[MCL_GSS].p_head; exp; exp=exp->m_next) {
+ exports_update_one(exp, verbose);
}
}
int i;
for (i = 0; i < MCL_MAXTYPES; i++) {
- for (exp = exportlist[i]; exp; exp = exp->m_next) {
+ for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
if (verbose)
printf("exporting %s:%s\n",
exp->m_client->m_hostname,
exp->m_xtabent = 1;
exp->m_mayexport = 1;
exp->m_changed = 1;
+ exp->m_warned = 0;
+ validate_export(exp);
}
}
}
-/*
- * unexport_all finds all entries that are mayexport, and
- * marks them not xtabent and not mayexport
- */
-static void
-unexport_all(int verbose)
-{
- nfs_export *exp;
- int i;
-
- for (i = 0; i < MCL_MAXTYPES; i++) {
- for (exp = exportlist[i]; exp; exp = exp->m_next)
- if (exp->m_mayexport) {
- if (verbose) {
- if (exp->m_exported) {
- printf("unexporting %s:%s from kernel\n",
- exp->m_client->m_hostname,
- exp->m_export.e_path);
- }
- else {
- printf("unexporting %s:%s\n",
- exp->m_client->m_hostname,
- exp->m_export.e_path);
- }
- }
- if (exp->m_exported && !export_unexport(exp))
- error(exp, errno);
- exp->m_xtabent = 0;
- exp->m_mayexport = 0;
- }
- }
-}
static void
exportfs(char *arg, char *options, int verbose)
{
struct exportent *eep;
- nfs_export *exp;
- struct hostent *hp = NULL;
+ nfs_export *exp = NULL;
+ struct addrinfo *ai = NULL;
char *path;
char *hname = arg;
int htype;
*path++ = '\0';
if (!path || *path != '/') {
- fprintf(stderr, "Invalid exporting option: %s\n", arg);
+ xlog(L_ERROR, "Invalid exporting option: %s", arg);
return;
}
- if ((htype = client_gettype(hname)) == MCL_FQDN &&
- (hp = gethostbyname(hname)) != NULL) {
- hp = hostent_dup (hp);
- exp = export_find(hp, path);
- } else {
- exp = export_lookup(hname, path);
- }
+ if ((htype = client_gettype(hname)) == MCL_FQDN) {
+ ai = host_addrinfo(hname);
+ if (ai != NULL) {
+ exp = export_find(ai, path);
+ hname = ai->ai_canonname;
+ }
+ } else
+ exp = export_lookup(hname, path, 0);
if (!exp) {
if (!(eep = mkexportent(hname, path, options)) ||
- !(exp = export_create(eep))) {
- if (hp) free (hp);
- return;
- }
- } else if (!updateexportent(&exp->m_export, options)) {
- if (hp) free (hp);
- return;
- }
+ !(exp = export_create(eep, 0)))
+ goto out;
+ } else if (!updateexportent(&exp->m_export, options))
+ goto out;
if (verbose)
printf("exporting %s:%s\n", exp->m_client->m_hostname,
exp->m_xtabent = 1;
exp->m_mayexport = 1;
exp->m_changed = 1;
- if (hp) free (hp);
+ exp->m_warned = 0;
+ validate_export(exp);
+
+out:
+ freeaddrinfo(ai);
}
static void
unexportfs(char *arg, int verbose)
{
nfs_export *exp;
- struct hostent *hp = NULL;
+ struct addrinfo *ai = NULL;
char *path;
char *hname = arg;
int htype;
*path++ = '\0';
if (!path || *path != '/') {
- fprintf(stderr, "Invalid unexporting option: %s\n",
- arg);
+ xlog(L_ERROR, "Invalid unexporting option: %s", arg);
return;
}
if ((htype = client_gettype(hname)) == MCL_FQDN) {
- if ((hp = gethostbyname(hname)) != 0) {
- hp = hostent_dup (hp);
- hname = (char *) hp->h_name;
- }
+ ai = host_addrinfo(hname);
+ if (ai)
+ hname = ai->ai_canonname;
}
- for (exp = exportlist[htype]; exp; exp = exp->m_next) {
+ for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
if (path && strcmp(path, exp->m_export.e_path))
continue;
- if (htype != exp->m_client->m_type
- || (htype == MCL_FQDN
- && !matchhostname(exp->m_export.e_hostname,
- hname)))
+ if (htype != exp->m_client->m_type)
+ continue;
+ if (htype == MCL_FQDN
+ && !matchhostname(exp->m_export.e_hostname,
+ hname))
+ continue;
+ if (htype != MCL_FQDN
+ && strcasecmp(exp->m_export.e_hostname, hname))
continue;
if (verbose) {
+#if 0
if (exp->m_exported) {
printf("unexporting %s:%s from kernel\n",
exp->m_client->m_hostname,
exp->m_export.e_path);
}
- else {
+ else
+#endif
printf("unexporting %s:%s\n",
exp->m_client->m_hostname,
exp->m_export.e_path);
- }
}
+#if 0
if (exp->m_exported && !export_unexport(exp))
error(exp, errno);
+#endif
exp->m_xtabent = 0;
exp->m_mayexport = 0;
}
- if (hp) free (hp);
+ freeaddrinfo(ai);
+}
+
+static int can_test(void)
+{
+ int fd;
+ int n;
+ char *setup = "nfsd 0.0.0.0 2147483647 -test-client-\n";
+ fd = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
+ if ( fd < 0) return 0;
+ n = write(fd, setup, strlen(setup));
+ close(fd);
+ if (n < 0)
+ return 0;
+ fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
+ if ( fd < 0) return 0;
+ close(fd);
+ return 1;
+}
+
+static int test_export(char *path, int with_fsid)
+{
+ char buf[1024];
+ int fd, n;
+
+ sprintf(buf, "-test-client- %s 3 %d -1 -1 0\n",
+ path,
+ with_fsid ? NFSEXP_FSID : 0);
+ fd = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
+ if (fd < 0)
+ return 0;
+ n = write(fd, buf, strlen(buf));
+ close(fd);
+ if (n < 0)
+ return 0;
+ return 1;
+}
+
+static void
+validate_export(nfs_export *exp)
+{
+ /* Check that the given export point is potentially exportable.
+ * We just give warnings here, don't cause anything to fail.
+ * If a path doesn't exist, or is not a dir or file, give an warning
+ * otherwise trial-export to '-test-client-' and check for failure.
+ */
+ struct stat stb;
+ char *path = exp->m_export.e_path;
+ struct statfs64 stf;
+ int fs_has_fsid = 0;
+
+ if (stat(path, &stb) < 0) {
+ xlog(L_ERROR, "Failed to stat %s: %m", path);
+ return;
+ }
+ if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode)) {
+ xlog(L_ERROR, "%s is neither a directory nor a file. "
+ "Remote access will fail", path);
+ return;
+ }
+ if (!can_test())
+ return;
+
+ if (!statfs64(path, &stf) &&
+ (stf.f_fsid.__val[0] || stf.f_fsid.__val[1]))
+ fs_has_fsid = 1;
+
+ if ((exp->m_export.e_flags & NFSEXP_FSID) || exp->m_export.e_uuid ||
+ fs_has_fsid) {
+ if ( !test_export(path, 1)) {
+ xlog(L_ERROR, "%s does not support NFS export", path);
+ return;
+ }
+ } else if ( ! test_export(path, 0)) {
+ if (test_export(path, 1))
+ xlog(L_ERROR, "%s requires fsid= for NFS export", path);
+ else
+ xlog(L_ERROR, "%s does not support NFS export", path);
+ return;
+
+ }
+}
+
+static _Bool
+is_hostname(const char *sp)
+{
+ if (*sp == '\0' || *sp == '@')
+ return false;
+
+ for (; *sp != '\0'; sp++) {
+ if (*sp == '*' || *sp == '?' || *sp == '[' || *sp == '/')
+ return false;
+ if (*sp == '\\' && sp[1] != '\0')
+ sp++;
+ }
+
+ return true;
+}
+
+/*
+ * Take care to perform an explicit reverse lookup on presentation
+ * addresses. Otherwise we don't get a real canonical name or a
+ * complete list of addresses.
+ */
+static struct addrinfo *
+address_list(const char *hostname)
+{
+ struct addrinfo *ai;
+ char *cname;
+
+ ai = host_pton(hostname);
+ if (ai != NULL) {
+ /* @hostname was a presentation address */
+ cname = host_canonname(ai->ai_addr);
+ freeaddrinfo(ai);
+ if (cname != NULL)
+ goto out;
+ }
+ /* @hostname was a hostname or had no reverse mapping */
+ cname = strdup(hostname);
+ if (cname == NULL)
+ return NULL;
+
+out:
+ ai = host_addrinfo(cname);
+ free(cname);
+ return ai;
+}
+
+static int
+matchhostname(const char *hostname1, const char *hostname2)
+{
+ struct addrinfo *results1 = NULL, *results2 = NULL;
+ struct addrinfo *ai1, *ai2;
+ int result = 0;
+
+ if (strcasecmp(hostname1, hostname2) == 0)
+ return 1;
+
+ /*
+ * Don't pass export wildcards or netgroup names to DNS
+ */
+ if (!is_hostname(hostname1) || !is_hostname(hostname2))
+ return 0;
+
+ results1 = address_list(hostname1);
+ if (results1 == NULL)
+ goto out;
+ results2 = address_list(hostname2);
+ if (results2 == NULL)
+ goto out;
+
+ if (strcasecmp(results1->ai_canonname, results2->ai_canonname) == 0) {
+ result = 1;
+ goto out;
+ }
+
+ for (ai1 = results1; ai1 != NULL; ai1 = ai1->ai_next)
+ for (ai2 = results2; ai2 != NULL; ai2 = ai2->ai_next)
+ if (nfs_compare_sockaddr(ai1->ai_addr, ai2->ai_addr)) {
+ result = 1;
+ break;
+ }
+
+out:
+ freeaddrinfo(results1);
+ freeaddrinfo(results2);
+ return result;
+}
+
+/* Based on mnt_table_parse_dir() in
+ util-linux-ng/shlibs/mount/src/tab_parse.c */
+static void
+export_d_read(const char *dname)
+{
+ int n = 0, i;
+ struct dirent **namelist = NULL;
+
+
+ n = scandir(dname, &namelist, NULL, versionsort);
+ if (n < 0) {
+ if (errno == ENOENT)
+ /* Silently return */
+ return;
+ xlog(L_NOTICE, "scandir %s: %s", dname, strerror(errno));
+ } else if (n == 0)
+ return;
+
+ for (i = 0; i < n; i++) {
+ struct dirent *d = namelist[i];
+ size_t namesz;
+ char fname[PATH_MAX + 1];
+ int fname_len;
+
+
+ if (d->d_type != DT_UNKNOWN
+ && d->d_type != DT_REG
+ && d->d_type != DT_LNK)
+ continue;
+ if (*d->d_name == '.')
+ continue;
+
+#define _EXT_EXPORT_SIZ (sizeof(_EXT_EXPORT) - 1)
+ namesz = strlen(d->d_name);
+ if (!namesz
+ || namesz < _EXT_EXPORT_SIZ + 1
+ || strcmp(d->d_name + (namesz - _EXT_EXPORT_SIZ),
+ _EXT_EXPORT))
+ continue;
+
+ fname_len = snprintf(fname, PATH_MAX +1, "%s/%s", dname, d->d_name);
+ if (fname_len > PATH_MAX) {
+ xlog(L_WARNING, "Too long file name: %s in %s", d->d_name, dname);
+ continue;
+ }
+
+ export_read(fname);
+ }
+
+ for (i = 0; i < n; i++)
+ free(namelist[i]);
+ free(namelist);
+
+ return;
}
static char
char *hname, c;
for (htype = 0; htype < MCL_MAXTYPES; htype++) {
- for (exp = exportlist[htype]; exp; exp = exp->m_next) {
+ for (exp = exportlist[htype].p_head; exp; exp = exp->m_next) {
ep = &exp->m_export;
if (!exp->m_xtabent)
continue; /* neilb */
c = dumpopt(c, "async");
if (ep->e_flags & NFSEXP_GATHERED_WRITES)
c = dumpopt(c, "wdelay");
+ if (ep->e_flags & NFSEXP_NOHIDE)
+ c = dumpopt(c, "nohide");
+ if (ep->e_flags & NFSEXP_CROSSMOUNT)
+ c = dumpopt(c, "crossmnt");
if (ep->e_flags & NFSEXP_INSECURE_PORT)
c = dumpopt(c, "insecure");
if (ep->e_flags & NFSEXP_ROOTSQUASH)
c = dumpopt(c, "no_root_squash");
if (ep->e_flags & NFSEXP_ALLSQUASH)
c = dumpopt(c, "all_squash");
- if (ep->e_maptype == CLE_MAP_UGIDD)
- c = dumpopt(c, "mapping=ugidd");
- else if (ep->e_maptype == CLE_MAP_FILE)
- c = dumpopt(c, "mapping=file");
- if (ep->e_anonuid != -2)
+ if (ep->e_flags & NFSEXP_NOSUBTREECHECK)
+ c = dumpopt(c, "no_subtree_check");
+ if (ep->e_flags & NFSEXP_NOAUTHNLM)
+ c = dumpopt(c, "insecure_locks");
+ if (ep->e_flags & NFSEXP_NOACL)
+ c = dumpopt(c, "no_acl");
+ if (ep->e_flags & NFSEXP_FSID)
+ c = dumpopt(c, "fsid=%d", ep->e_fsid);
+ if (ep->e_uuid)
+ c = dumpopt(c, "fsid=%s", ep->e_uuid);
+ if (ep->e_mountpoint)
+ c = dumpopt(c, "mountpoint%s%s",
+ ep->e_mountpoint[0]?"=":"",
+ ep->e_mountpoint);
+ if (ep->e_anonuid != 65534)
c = dumpopt(c, "anonuid=%d", ep->e_anonuid);
- if (ep->e_anongid != -2)
+ if (ep->e_anongid != 65534)
c = dumpopt(c, "anongid=%d", ep->e_anongid);
-
+ switch(ep->e_fslocmethod) {
+ case FSLOC_NONE:
+ break;
+ case FSLOC_REFER:
+ c = dumpopt(c, "refer=%s", ep->e_fslocdata);
+ break;
+ case FSLOC_REPLICA:
+ c = dumpopt(c, "replicas=%s", ep->e_fslocdata);
+ break;
+#ifdef DEBUG
+ case FSLOC_STUB:
+ c = dumpopt(c, "fsloc=stub");
+ break;
+#endif
+ }
+ secinfo_show(stdout, ep);
printf("%c\n", (c != '(')? ')' : ' ');
}
}
static void
error(nfs_export *exp, int err)
{
- fprintf(stderr, "%s:%s: %s\n", exp->m_client->m_hostname,
+ xlog(L_ERROR, "%s:%s: %s", exp->m_client->m_hostname,
exp->m_export.e_path, strerror(err));
}
static void
-usage(void)
+usage(const char *progname, int n)
{
- fprintf(stderr, "usage: exportfs [-aruv] [host:/path]\n");
- exit(1);
+ fprintf(stderr, "usage: %s [-afhioruv] [host:/path]\n", progname);
+ exit(n);
}
projects / nfs-utils.git / blobdiff