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Diffstat (limited to 'xlators/mgmt/glusterd/src/glusterd-mountbroker.c')
-rw-r--r--xlators/mgmt/glusterd/src/glusterd-mountbroker.c647
1 files changed, 647 insertions, 0 deletions
diff --git a/xlators/mgmt/glusterd/src/glusterd-mountbroker.c b/xlators/mgmt/glusterd/src/glusterd-mountbroker.c
new file mode 100644
index 000000000..03767ee6d
--- /dev/null
+++ b/xlators/mgmt/glusterd/src/glusterd-mountbroker.c
@@ -0,0 +1,647 @@
+/*
+ Copyright (c) 2011 Gluster, Inc. <http://www.gluster.com>
+ This file is part of GlusterFS.
+
+ GlusterFS is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3 of the License,
+ or (at your option) any later version.
+
+ GlusterFS is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see
+ <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+#include <inttypes.h>
+#include <fnmatch.h>
+#include <pwd.h>
+
+#include "globals.h"
+#include "glusterfs.h"
+#include "compat.h"
+#include "dict.h"
+#include "list.h"
+#include "logging.h"
+#include "defaults.h"
+#include "compat.h"
+#include "compat-errno.h"
+#include "run.h"
+#include "glusterd-mem-types.h"
+#include "glusterd.h"
+#include "glusterd-utils.h"
+
+#include "glusterd-mountbroker.h"
+#include "glusterd-op-sm.h"
+
+static int
+seq_dict_foreach (dict_t *dict,
+ int (*fn)(char *str, void *data),
+ void *data)
+{
+ char index[] = "4294967296"; // 1<<32
+ int i = 0;
+ char *val = NULL;
+ int ret = 0;
+
+ for (;;i++) {
+ snprintf(index, sizeof(index), "%d", i);
+ ret = dict_get_str (dict, index, &val);
+ if (ret != 0)
+ return ret == -ENOENT ? 0 : ret;
+ ret = fn (val, data);
+ if (ret != 0)
+ return ret;
+ }
+}
+
+static void
+skipwhite (char **s)
+{
+ while (isspace (**s))
+ (*s)++;
+}
+
+static char *
+nwstrtail (char *str, char *pattern)
+{
+ for (;;) {
+ skipwhite (&str);
+ skipwhite (&pattern);
+
+ if (*str != *pattern || !*str)
+ break;
+
+ str++;
+ pattern++;
+ }
+
+ return *pattern ? NULL : str;
+}
+
+
+int
+parse_mount_pattern_desc (gf_mount_spec_t *mspec, char *pdesc)
+#define SYNTAX_ERR -2
+{
+ char *curs = NULL;
+ char *c2 = NULL;
+ char sc = '\0';
+ char **cc = NULL;
+ gf_mount_pattern_t *pat = NULL;
+ int pnum = 0;
+ int ret = 0;
+ int lastsup = -1;
+ int incl = -1;
+ char **pcc = NULL;
+ int pnc = 0;
+
+ skipwhite (&pdesc);
+
+ /* a bow to theory */
+ if (!*pdesc)
+ return 0;
+
+ /* count number of components, separated by '&' */
+ mspec->len = 0;
+ for (curs = pdesc; *curs; curs++) {
+ if (*curs == ')')
+ mspec->len++;
+ }
+
+ mspec->patterns = GF_CALLOC (mspec->len, sizeof (*mspec->patterns),
+ gf_gld_mt_mount_pattern);
+ if (!mspec->patterns) {
+ ret = -1;
+ goto out;
+ }
+
+ pat = mspec->patterns;
+ curs = pdesc;
+ skipwhite (&curs);
+ for (;;) {
+ incl = -1;
+
+ /* check for pattern signedness modifier */
+ if (*curs == '-') {
+ pat->negative = _gf_true;
+ curs++;
+ }
+
+ /* now should come condition specifier,
+ * then opening paren
+ */
+ c2 = nwstrtail (curs, "SUB(");
+ if (c2) {
+ pat->condition = SET_SUB;
+ goto got_cond;
+ }
+ c2 = nwstrtail (curs, "SUP(");
+ if (c2) {
+ pat->condition = SET_SUPER;
+ lastsup = pat - mspec->patterns;
+ goto got_cond;
+ }
+ c2 = nwstrtail (curs, "EQL(");
+ if (c2) {
+ pat->condition = SET_EQUAL;
+ goto got_cond;
+ }
+ c2 = nwstrtail (curs, "MEET(");
+ if (c2) {
+ pat->condition = SET_INTERSECT;
+ goto got_cond;
+ }
+ c2 = nwstrtail (curs, "SUB+(");
+ if (c2) {
+ pat->condition = SET_SUB;
+ incl = lastsup;
+ goto got_cond;
+ }
+
+ ret = SYNTAX_ERR;
+ goto out;
+
+ got_cond:
+ curs = c2;
+ skipwhite (&curs);
+ /* count the number of components for pattern */
+ pnum = *curs == ')' ? 0 : 1;
+ for (c2 = curs ;*c2 != ')';) {
+ if (strchr ("&|", *c2)) {
+ ret = SYNTAX_ERR;
+ goto out;
+ }
+ while (!strchr ("|&)", *c2) && !isspace (*c2))
+ c2++;
+ skipwhite (&c2);
+ switch (*c2) {
+ case ')':
+ break;
+ case '\0':
+ case '&':
+ ret = SYNTAX_ERR;
+ goto out;
+ case '|':
+ *c2 = ' ';
+ skipwhite (&c2);
+ /* fall through */
+ default:
+ pnum++;
+ }
+ }
+ if (incl >= 0) {
+ pnc = 0;
+ for (pcc = mspec->patterns[incl].components; *pcc; pcc++)
+ pnc++;
+ pnum += pnc;
+ }
+ pat->components = GF_CALLOC (pnum + 1, sizeof (*pat->components),
+ gf_gld_mt_mount_comp_container);
+ if (!pat->components) {
+ ret = -1;
+ goto out;
+ }
+
+ cc = pat->components;
+ /* copy over included component set */
+ if (incl >= 0) {
+ memcpy (pat->components,
+ mspec->patterns[incl].components,
+ pnc * sizeof (*pat->components));
+ cc += pnc;
+ }
+ /* parse and add components */
+ c2 = ""; /* reset c2 */
+ while (*c2 != ')') {
+ c2 = curs;
+ while (!isspace (*c2) && *c2 != ')')
+ c2++;
+ sc = *c2;
+ *c2 = '\0';;
+ *cc = gf_strdup (curs);
+ if (!*cc) {
+ ret = -1;
+ goto out;
+ }
+ *c2 = sc;
+ skipwhite (&c2);
+ curs = c2;
+ cc++;
+ }
+
+ curs++;
+ skipwhite (&curs);
+ if (*curs == '&') {
+ curs++;
+ skipwhite (&curs);
+ }
+
+ if (!*curs)
+ break;
+ pat++;
+ }
+
+ out:
+ if (ret == SYNTAX_ERR) {
+ gf_log ("", GF_LOG_ERROR, "cannot parse mount patterns %s",
+ pdesc);
+ }
+
+ /* We've allocted a lotta stuff here but don't bother with freeing
+ * on error, in that case we'll terminate anyway
+ */
+ return ret ? -1 : 0;
+}
+#undef SYNTAX_ERR
+
+
+const char *georep_mnt_desc_template =
+ "SUP("
+ "xlator-option=\\*-dht.assert-no-child-down=true "
+ "volfile-server=localhost "
+ "client-pid=-1 "
+ "volfile-id=%s "
+ "user-map-root=%s "
+ ")"
+ "SUB+("
+ "log-file="DEFAULT_LOG_FILE_DIRECTORY"/"GEOREP"*/* "
+ "log-level=* "
+ ")";
+
+int
+make_georep_mountspec (gf_mount_spec_t *mspec, const char *volname,
+ char *user)
+{
+ char *georep_mnt_desc = NULL;
+ int ret = 0;
+
+ ret = gf_asprintf (&georep_mnt_desc, georep_mnt_desc_template,
+ volname, user);
+ if (ret == -1)
+ return ret;
+
+ return parse_mount_pattern_desc (mspec, georep_mnt_desc);
+}
+
+static gf_boolean_t
+match_comp (char *str, char *patcomp)
+{
+ char *c1 = patcomp;
+ char *c2 = str;
+
+ GF_ASSERT (c1);
+ GF_ASSERT (c2);
+
+ while (*c1 == *c2) {
+ if (!*c1)
+ return _gf_true;
+ c1++;
+ c2++;
+ if (c1[-1] == '=')
+ break;
+ }
+
+ return fnmatch (c1, c2, 0) == 0 ? _gf_true : _gf_false;
+}
+
+struct gf_set_descriptor {
+ gf_boolean_t priv[2];
+ gf_boolean_t common;
+};
+
+static int
+_gf_set_dict_iter1 (char *val, void *data)
+{
+ void **dataa = data;
+ struct gf_set_descriptor *sd = dataa[0];
+ char **curs = dataa[1];
+ gf_boolean_t priv = _gf_true;
+
+ while (*curs) {
+ if (match_comp (val, *curs)) {
+ priv = _gf_false;
+ sd->common = _gf_true;
+ }
+ curs++;
+ }
+
+ if (priv)
+ sd->priv[0] = _gf_true;
+
+ return 0;
+}
+
+static int
+_gf_set_dict_iter2 (char *val, void *data)
+{
+ void **dataa = data;
+ gf_boolean_t *boo = dataa[0];
+ char *comp = dataa[1];
+
+ if (match_comp (val, comp))
+ *boo = _gf_true;
+
+ return 0;
+}
+
+static void
+relate_sets (struct gf_set_descriptor *sd, dict_t *argdict, char **complist)
+{
+ void *dataa[] = {NULL, NULL};
+ gf_boolean_t boo = _gf_false;
+
+ memset (sd, 0, sizeof (*sd));
+
+ dataa[0] = sd;
+ dataa[1] = complist;
+ seq_dict_foreach (argdict, _gf_set_dict_iter1, dataa);
+
+ while (*complist) {
+ boo = _gf_false;
+ dataa[0] = &boo;
+ dataa[1] = *complist;
+ seq_dict_foreach (argdict, _gf_set_dict_iter2, dataa);
+
+ if (boo)
+ sd->common = _gf_true;
+ else
+ sd->priv[1] = _gf_true;
+
+ complist++;
+ }
+}
+
+static int
+_arg_parse_uid (char *val, void *data)
+{
+ char *user = strtail (val, "user-map-root=");
+ struct passwd *pw = NULL;
+
+ if (!user)
+ return 0;
+ pw = getpwnam (user);
+ if (!pw)
+ return -EINVAL;
+
+ if (*(int *)data >= 0)
+ /* uid ambiguity, already found */
+ return -EINVAL;
+
+ *(int *)data = pw->pw_uid;
+ return 0;
+}
+
+static int
+evaluate_mount_request (gf_mount_spec_t *mspec, dict_t *argdict)
+{
+ struct gf_set_descriptor sd = {{0,},};
+ int i = 0;
+ int uid = -1;
+ int ret = 0;
+ gf_boolean_t match = _gf_false;
+
+ for (i = 0; i < mspec->len; i++) {
+ relate_sets (&sd, argdict, mspec->patterns[i].components);
+ switch (mspec->patterns[i].condition) {
+ case SET_SUB:
+ match = !sd.priv[0];
+ break;
+ case SET_SUPER:
+ match = !sd.priv[1];
+ break;
+ case SET_EQUAL:
+ match = (!sd.priv[0] && !sd.priv[1]);
+ break;
+ case SET_INTERSECT:
+ match = sd.common;
+ default:
+ GF_ASSERT(!"unreached");
+ }
+ if (mspec->patterns[i].negative)
+ match = !match;
+
+ if (!match)
+ return -EPERM;
+ }
+
+ ret = seq_dict_foreach (argdict, _arg_parse_uid, &uid);
+ if (ret != 0)
+ return ret;
+
+ return uid;
+}
+
+static int
+_volname_get (char *val, void *data)
+{
+ char **volname = data;
+
+ *volname = strtail (val, "volfile-id=");
+
+ return *volname ? 1 : 0;
+}
+
+static int
+_runner_add (char *val, void *data)
+{
+ runner_t *runner = data;
+
+ runner_argprintf (runner, "--%s", val);
+
+ return 0;
+}
+
+int
+glusterd_do_mount (char *label, dict_t *argdict, char **path, int *op_errno)
+{
+ glusterd_conf_t *priv = NULL;
+ char *mountbroker_root = NULL;
+ gf_mount_spec_t *mspec = NULL;
+ int uid = -ENOENT;
+ char *volname = NULL;
+ glusterd_volinfo_t *vol = NULL;
+ char *mtptemp = NULL;
+ char *mntlink = NULL;
+ char *cookieswitch = NULL;
+ char *cookie = NULL;
+ char *sla = NULL;
+ struct stat st = {0,};
+ runner_t runner = {0,};
+ int ret = 0;
+ xlator_t *this = THIS;
+
+ priv = this->private;
+ GF_ASSERT (priv);
+
+ GF_ASSERT (op_errno);
+ *op_errno = 0;
+
+ if (dict_get_str (this->options, "mountbroker-root",
+ &mountbroker_root) != 0) {
+ *op_errno = ENOENT;
+ goto out;
+ }
+
+ GF_ASSERT (label);
+ if (!*label) {
+ *op_errno = EINVAL;
+ goto out;
+ }
+
+ /* look up spec for label */
+ list_for_each_entry (mspec, &priv->mount_specs,
+ speclist) {
+ if (strcmp (mspec->label, label) != 0)
+ continue;
+ uid = evaluate_mount_request (mspec, argdict);
+ break;
+ }
+ if (uid < 0) {
+ *op_errno = -uid;
+ goto out;
+ }
+
+ /* some sanity check on arguments */
+ seq_dict_foreach (argdict, _volname_get, &volname);
+ if (!volname) {
+ *op_errno = EINVAL;
+ goto out;
+ }
+ if (glusterd_volinfo_find (volname, &vol) != 0 ||
+ !glusterd_is_volume_started (vol)) {
+ *op_errno = ENOENT;
+ goto out;
+ }
+
+ /* go do mount */
+
+ /** create actual mount dir */
+
+ /*** "overload" string name to be possible to used for cookie
+ creation, see below */
+ ret = gf_asprintf (&mtptemp, "%s/user%d/mtpt-%s-XXXXXX/cookie",
+ mountbroker_root, uid, label);
+ if (ret == -1) {
+ mtptemp = NULL;
+ *op_errno = ENOMEM;
+ goto out;
+ }
+ /*** hide cookie part */
+ cookieswitch = strrchr (mtptemp, '/');
+ *cookieswitch = '\0';
+
+ sla = strrchr (mtptemp, '/');
+ *sla = '\0';
+ ret = mkdir (mtptemp, 0700);
+ if (ret == 0)
+ ret = chown (mtptemp, uid, 0);
+ else if (errno == EEXIST)
+ ret = 0;
+ if (ret == -1) {
+ *op_errno = errno;
+ goto out;
+ }
+ ret = lstat (mtptemp, &st);
+ if (ret == -1) {
+ *op_errno = errno;
+ goto out;
+ }
+ if (!(S_ISDIR (st.st_mode) && (st.st_mode & ~S_IFMT) == 0700 &&
+ st.st_uid == uid && st.st_gid == 0)) {
+ *op_errno = EACCES;
+ goto out;
+ }
+ *sla = '/';
+
+ if (!mkdtemp (mtptemp)) {
+ *op_errno = errno;
+ goto out;
+ }
+
+ /** create private "cookie" symlink */
+
+ /*** occupy an entry in the hive dir via mkstemp */
+ ret = gf_asprintf (&cookie, "%s/"MB_HIVE"/mntXXXXXX",
+ mountbroker_root);
+ if (ret == -1) {
+ cookie = NULL;
+ *op_errno = ENOMEM;
+ goto out;
+ }
+ ret = mkstemp (cookie);
+ if (ret == -1) {
+ *op_errno = errno;
+ goto out;
+ }
+ close (ret);
+
+ /*** assembly the path from cookie to mountpoint */
+ sla = strchr (sla - 1, '/');
+ GF_ASSERT (sla);
+ ret = gf_asprintf (&mntlink, "../user%d%s", uid, sla);
+ if (ret == -1) {
+ *op_errno = ENOMEM;
+ goto out;
+ }
+
+ /*** create cookie link in (to-be) mountpoint,
+ move it over to the final place */
+ *cookieswitch = '/';
+ ret = symlink (mntlink, mtptemp);
+ if (ret != -1)
+ ret = rename (mtptemp, cookie);
+ *cookieswitch = '\0';
+ if (ret == -1) {
+ *op_errno = errno;
+ goto out;
+ }
+
+ /** invoke glusterfs on the mountpoint */
+
+ runinit (&runner);
+ runner_add_arg (&runner, GFS_PREFIX"/sbin/glusterfs");
+ seq_dict_foreach (argdict, _runner_add, &runner);
+ runner_add_arg (&runner, mtptemp);
+ ret = runner_run_reuse (&runner);
+ if (ret == -1) {
+ *op_errno = EIO; /* XXX hacky fake */
+ runner_log (&runner, "", GF_LOG_ERROR, "command failed");
+ }
+ runner_end (&runner);
+
+ out:
+
+ if (*op_errno) {
+ ret = -1;
+ gf_log ("", GF_LOG_WARNING, "unsuccessful mount request (%s)",
+ strerror (*op_errno));
+ if (mtptemp) {
+ *cookieswitch = '/';
+ unlink (mtptemp);
+ *cookieswitch = '\0';
+ rmdir (mtptemp);
+ }
+ if (cookie) {
+ unlink (cookie);
+ GF_FREE (cookie);
+ }
+
+ } else {
+ ret = 0;
+ *path = cookie;
+ }
+
+ if (mtptemp)
+ GF_FREE (mtptemp);
+
+ return ret;
+}
generated by cgit (git 2.34.1) at 2024-05-13 06:38:08 +0000