# Makefile for libvirt python library ## Copyright (C) 2005-2012 Red Hat, Inc. ## See COPYING.LIB for the License of this software SUBDIRS= . tests INCLUDES = \ $(PYTHON_INCLUDES) \ -I$(top_builddir)/gnulib/lib \ -I$(top_srcdir)/gnulib/lib \ -I$(top_builddir)/src \ -I$(top_srcdir)/src \ -I$(top_srcdir)/src/util \ -I$(top_builddir)/include \ -I$(top_srcdir)/include \ $(GETTEXT_CPPFLAGS) AM_CFLAGS = $(WARN_CFLAGS) DOCS_DIR = $(datadir)/doc/libvirt-python-$(VERSION) DOCS = ${srcdir}/TODO CLASSES_EXTRA = \ libvirt-override-virConnect.py \ libvirt-override-virDomain.py \ libvirt-override-virDomainSnapshot.py \ libvirt-override-virStream.py EXTRA_DIST = \ generator.py \ typewrappers.c \ typewrappers.h \ libvirt-override.c \ libvirt-override.py \ libvirt-override-api.xml \ libvirt-lxc-override.c \ libvirt-lxc-override-api.xml \ libvirt-qemu-override.c \ libvirt-qemu-override-api.xml \ $(CLASSES_EXTRA) \ $(DOCS) if WITH_PYTHON mylibs = \ $(top_builddir)/src/libvirt.la \ $(top_builddir)/gnulib/lib/libgnu.la myqemulibs = \ $(top_builddir)/src/libvirt-qemu.la \ $(top_builddir)/gnulib/lib/libgnu.la mylxclibs = \ $(top_builddir)/src/libvirt-lxc.la \ $(top_builddir)/gnulib/lib/libgnu.la all-local: libvirt.py libvirt_qemu.py libvirt_lxc.py pyexec_LTLIBRARIES = libvirtmod.la libvirtmod_qemu.la libvirtmod_lxc.la libvirtmod_la_SOURCES = libvirt-override.c typewrappers.c nodist_libvirtmod_la_SOURCES = libvirt.c libvirt.h # Python <= 2.4 header files contain a redundant decl, hence we # need extra flags here libvirtmod_la_CFLAGS = $(WARN_CFLAGS) $(WARN_PYTHON_CFLAGS) libvirtmod_la_LDFLAGS = -module -avoid-version -shared -L$(top_builddir)/src/.libs \ $(CYGWIN_EXTRA_LDFLAGS) libvirtmod_la_LIBADD = $(mylibs) \ $(CYGWIN_EXTRA_LIBADD) $(CYGWIN_EXTRA_PYTHON_LIBADD) libvirtmod_qemu_la_SOURCES = libvirt-qemu-override.c typewrappers.c nodist_libvirtmod_qemu_la_SOURCES = libvirt-qemu.c libvirt-qemu.h # Python <= 2.4 header files contain a redundant decl, hence we # need extra flags here libvirtmod_qemu_la_CFLAGS = $(WARN_PYTHON_CFLAGS) libvirtmod_qemu_la_LDFLAGS = -module -avoid-version -shared -L$(top_builddir)/src/.libs \ $(CYGWIN_EXTRA_LDFLAGS) libvirtmod_qemu_la_LIBADD = $(myqemulibs) \ $(CYGWIN_EXTRA_LIBADD) $(CYGWIN_EXTRA_PYTHON_LIBADD) libvirtmod_lxc_la_SOURCES = libvirt-lxc-override.c typewrappers.c nodist_libvirtmod_lxc_la_SOURCES = libvirt-lxc.c libvirt-lxc.h # Python <= 2.4 header files contain a redundant decl, hence we # need extra flags here libvirtmod_lxc_la_CFLAGS = $(WARN_PYTHON_CFLAGS) libvirtmod_lxc_la_LDFLAGS = -module -avoid-version -shared -L$(top_builddir)/src/.libs \ $(CYGWIN_EXTRA_LDFLAGS) libvirtmod_lxc_la_LIBADD = $(mylxclibs) \ $(CYGWIN_EXTRA_LIBADD) $(CYGWIN_EXTRA_PYTHON_LIBADD) GENERATE = generator.py API_DESC = $(top_srcdir)/docs/libvirt-api.xml $(srcdir)/libvirt-override-api.xml GENERATED= libvirt-export.c \ libvirt.c \ libvirt.h \ libvirt.py QEMU_API_DESC = $(top_srcdir)/docs/libvirt-qemu-api.xml $(srcdir)/libvirt-qemu-override-api.xml QEMU_GENERATED= libvirt-qemu-export.c \ libvirt-qemu.c \ libvirt-qemu.h \ libvirt_qemu.py LXC_API_DESC = $(top_srcdir)/docs/libvirt-lxc-api.xml $(srcdir)/libvirt-lxc-override-api.xml LXC_GENERATED= libvirt-lxc-export.c \ libvirt-lxc.c \ libvirt-lxc.h \ libvirt_lxc.py $(GENERATE).stamp: $(srcdir)/$(GENERATE) $(API_DESC) $(QEMU_API_DESC) $(LXC_API_DESC) $(AM_V_GEN)$(PYTHON) $(srcdir)/$(GENERATE) $(PYTHON) && \ touch $@ $(GENERATED) $(QEMU_GENERATED) $(LXC_GENERATED): $(GENERATE).stamp $(libvirtmod_la_OBJECTS): $(GENERATED) $(libvirtmod_qemu_la_OBJECTS): $(QEMU_GENERATED) $(libvirtmod_lxc_la_OBJECTS): $(LXC_GENERATED) EXTRA_DIST += sanitytest.py check-local: $(AM_V_GEN)../run $(PYTHON) $(srcdir)/sanitytest.py install-data-local: $(mkinstalldirs) $(DESTDIR)$(pyexecdir) $(INSTALL) -m 0644 libvirt.py $(DESTDIR)$(pyexecdir) $(INSTALL) -m 0644 libvirt_lxc.py $(DESTDIR)$(pyexecdir) $(INSTALL) -m 0644 libvirt_qemu.py $(DESTDIR)$(pyexecdir) $(mkinstalldirs) $(DESTDIR)$(DOCS_DIR) @(for doc in $(DOCS) ; \ do $(INSTALL) -m 0644 $$doc $(DESTDIR)$(DOCS_DIR) ; done) uninstall-local: rm -f $(DESTDIR)$(pyexecdir)/libvirt.py rm -f $(DESTDIR)$(pyexecdir)/libvirt_lxc.py rm -f $(DESTDIR)$(pyexecdir)/libvirt_qemu.py CLEANFILES= $(GENERATED) $(QEMU_GENERATED) $(LXC_GENERATED) $(GENERATE).stamp else all: endif dummy: tests test: all dummy -@(cd tests && $(MAKE) MAKEFLAGS+=--silent tests) b'> 
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/*
    SSSD

    LDAP ID backend operation retry logic and connection cache

    Authors:
        Eugene Indenbom <eindenbom@gmail.com>

    Copyright (C) 2008-2010 Red Hat

    This program 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.

    This program 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/>.
*/

#include "providers/ldap/sdap_id_op.h"
#include "providers/ldap/sdap_async.h"
#include "util/util.h"

/* LDAP async connection cache */
struct sdap_id_conn_cache {
    struct be_ctx *be;
    struct sdap_options *opts;
    struct sdap_service *service;

    /* list of all open connections */
    struct sdap_id_conn_data *connections;
    /* cached (current) connection */
    struct sdap_id_conn_data *cached_connection;
};

/* LDAP async operation tracker:
 *  - keeps track of connection usage
 *  - keeps track of operation retries */
struct sdap_id_op {
    /* ID backend context */
    struct sdap_id_conn_cache *conn_cache;
    /* double linked list pointers */
    struct sdap_id_op *prev, *next;
    /* current connection */
    struct sdap_id_conn_data *conn_data;
    /* number of reconnects for this operation */
    int reconnect_retry_count;
    /* connection request
     * It is required as we need to know which requests to notify
     * when shared connection request to sdap_handle completes.
     * This member is cleared when sdap_id_op_connect_state
     * associated with request is destroyed */
    struct tevent_req *connect_req;
};

/* LDAP connection cache connection attempt/established connection data */
struct sdap_id_conn_data {
    /* LDAP connection cache */
    struct sdap_id_conn_cache *conn_cache;
    /* double linked list pointers */
    struct sdap_id_conn_data *prev, *next;
    /* sdap handle */
    struct sdap_handle *sh;
    /* what rootDSE returns */
    struct sysdb_attrs *rootDSE;
    /* connection request */
    struct tevent_req *connect_req;
    /* timer for connection expiration */
    struct tevent_timer *expire_timer;
    /* number of running connection notifies */
    int notify_lock;
    /* list of operations using connect */
    struct sdap_id_op *ops;
};

/* state of connect request */
struct sdap_id_op_connect_state {
    struct sdap_id_op *op;
    int dp_error;
    int result;
};

static void sdap_id_conn_cache_be_offline_cb(void *pvt);

static void sdap_id_release_conn_data(struct sdap_id_conn_data *conn_data);
static int sdap_id_conn_data_destroy(struct sdap_id_conn_data *conn_data);
static bool sdap_is_connection_expired(struct sdap_id_conn_data *conn_data, int timeout);
static bool sdap_can_reuse_connection(struct sdap_id_conn_data *conn_data);
static void sdap_id_conn_data_expire_handler(struct tevent_context *ev,
                                             struct tevent_timer *te,
                                             struct timeval current_time,
                                             void *pvt);
static int sdap_id_conn_data_set_expire_timer(struct sdap_id_conn_data *conn_data);

static void sdap_id_op_hook_conn_data(struct sdap_id_op *op, struct sdap_id_conn_data *conn_data);
static int sdap_id_op_destroy(void *pvt);
static bool sdap_id_op_can_reconnect(struct sdap_id_op *op);

static void sdap_id_op_connect_req_complete(struct sdap_id_op *op, int dp_error, int ret);
static int sdap_id_op_connect_state_destroy(void *pvt);
static int sdap_id_op_connect_step(struct tevent_req *req);
static void sdap_id_op_connect_done(struct tevent_req *subreq);

/* Create a connection cache */
int sdap_id_conn_cache_create(TALLOC_CTX *memctx,
                              struct be_ctx *be,
                              struct sdap_options *opts,
                              struct sdap_service *service,
                              struct sdap_id_conn_cache** conn_cache_out)
{
    int ret;
    struct sdap_id_conn_cache *conn_cache = talloc_zero(memctx, struct sdap_id_conn_cache);
    if (!conn_cache) {
        DEBUG(1, ("talloc_zero(struct sdap_id_conn_cache) failed.\n"));
        ret = ENOMEM;
        goto fail;
    }

    conn_cache->be = be;
    conn_cache->opts = opts;
    conn_cache->service = service;

    ret = be_add_offline_cb(conn_cache, be,
                            sdap_id_conn_cache_be_offline_cb, conn_cache,
                            NULL);
    if (ret != EOK) {
        DEBUG(1, ("be_add_offline_cb failed.\n"));
        goto fail;
    }

    *conn_cache_out = conn_cache;
    return EOK;

fail:
    talloc_zfree(conn_cache);
    return ret;
}

/* Callback on BE going offline */
static void sdap_id_conn_cache_be_offline_cb(void *pvt)
{
    struct sdap_id_conn_cache *conn_cache = talloc_get_type(pvt, struct sdap_id_conn_cache);
    struct sdap_id_conn_data *cached_connection = conn_cache->cached_connection;

    /* Release any cached connection on going offline */
    if (cached_connection != NULL) {
        conn_cache->cached_connection = NULL;
        sdap_id_release_conn_data(cached_connection);
    }
}

/* Release sdap_id_conn_data and destroy it if no longer needed */
static void sdap_id_release_conn_data(struct sdap_id_conn_data *conn_data)
{
    struct sdap_id_conn_cache *conn_cache;
    if (!conn_data || conn_data->ops || conn_data->notify_lock) {
        /* connection is in use */
        return;
    }

    conn_cache = conn_data->conn_cache;
    if (conn_data == conn_cache->cached_connection) {
        return;
    }

    DEBUG(9, ("releasing unused connection\n"));

    DLIST_REMOVE(conn_cache->connections, conn_data);
    talloc_zfree(conn_data);
}

/* Destructor for struct sdap_id_conn_data */
static int sdap_id_conn_data_destroy(struct sdap_id_conn_data *conn_data)
{
    struct sdap_id_op *op;

    /* we clean out list of ops to make sure that order of destruction does not matter */
    while ((op = conn_data->ops) != NULL) {
        op->conn_data = NULL;
        DLIST_REMOVE(conn_data->ops, op);
    }

    return 0;
}

/* Check whether connection will expire after timeout seconds */
static bool sdap_is_connection_expired(struct sdap_id_conn_data *conn_data, int timeout)
{
    time_t expire_time;
    if (!conn_data || !conn_data->sh || !conn_data->sh->connected) {
        return true;
    }

    expire_time = conn_data->sh->expire_time;
    if ((expire_time != 0) && (expire_time < time( NULL ) + timeout) ) {
        return true;
    }

    return false;
}

/* Check whether connection can be reused for next LDAP ID operation */
static bool sdap_can_reuse_connection(struct sdap_id_conn_data *conn_data)
{
    int timeout;

    if (!conn_data || !conn_data->sh || !conn_data->sh->connected) {
        return false;
    }

    timeout = dp_opt_get_int(conn_data->conn_cache->opts->basic, SDAP_OPT_TIMEOUT);
    return !sdap_is_connection_expired(conn_data, timeout);
}

/* Set expiration timer for connection if needed */
static int sdap_id_conn_data_set_expire_timer(struct sdap_id_conn_data *conn_data)
{
    int timeout;
    struct timeval tv;

    memset(&tv, 0, sizeof(tv));

    tv.tv_sec = conn_data->sh->expire_time;
    if (tv.tv_sec <= 0) {
        return EOK;
    }

    timeout = dp_opt_get_int(conn_data->conn_cache->opts->basic, SDAP_OPT_TIMEOUT);
    if (timeout > 0) {
        tv.tv_sec -= timeout;
    }

    if (tv.tv_sec <= time(NULL)) {
        return EOK;
    }

    talloc_zfree(conn_data->expire_timer);

    conn_data->expire_timer = tevent_add_timer(conn_data->conn_cache->be->ev,
                                               conn_data,
                                               tv,
                                               sdap_id_conn_data_expire_handler,
                                               conn_data);
    if (!conn_data->expire_timer) {
        return ENOMEM;
    }

    return EOK;
}

/* Handler for connection expiration timer */
static void sdap_id_conn_data_expire_handler(struct tevent_context *ev,
                                              struct tevent_timer *te,
                                              struct timeval current_time,
                                              void *pvt)
{
    struct sdap_id_conn_data *conn_data = talloc_get_type(pvt,
                                                          struct sdap_id_conn_data);
    struct sdap_id_conn_cache *conn_cache = conn_data->conn_cache;

    DEBUG(3, ("connection is about to expire, releasing it\n"));

    if (conn_cache->cached_connection == conn_data) {
        conn_cache->cached_connection = NULL;

        sdap_id_release_conn_data(conn_data);
    }
}

/* Create an operation object */
struct sdap_id_op *sdap_id_op_create(TALLOC_CTX *memctx, struct sdap_id_conn_cache *conn_cache)
{
    struct sdap_id_op *op = talloc_zero(memctx, struct sdap_id_op);
    if (!op) {
        return NULL;
    }

    op->conn_cache = conn_cache;

    talloc_set_destructor((void*)op, sdap_id_op_destroy);
    return op;
}

/* Attach/detach connection to sdap_id_op */
static void sdap_id_op_hook_conn_data(struct sdap_id_op *op, struct sdap_id_conn_data *conn_data)
{
    if (!op) {
        DEBUG(0, ("NULL op passed!!!\n"));
        return;
    }

    struct sdap_id_conn_data *current = op->conn_data;
    if (conn_data == current) {
        return;
    }

    if (current) {
        DLIST_REMOVE(current->ops, op);
    }

    op->conn_data = conn_data;

    if (conn_data) {
        DLIST_ADD_END(conn_data->ops, op, struct sdap_id_op*);
    }

    if (current) {
        sdap_id_release_conn_data(current);
    }
}

/* Destructor for sdap_id_op */
static int sdap_id_op_destroy(void *pvt)
{
    struct sdap_id_op *op = talloc_get_type(pvt, struct sdap_id_op);

    if (op->conn_data) {
        DEBUG(9, ("releasing operation connection\n"));
        sdap_id_op_hook_conn_data(op, NULL);
    }

    return 0;
}

/* Check whether retry with reconnect can be performed for the operation */
static bool sdap_id_op_can_reconnect(struct sdap_id_op *op)
{
    /* we allow 2 retries for failover server configured:
     *   - one for connection broken during request execution
     *   - one for the following (probably failed) reconnect attempt */
    int max_retries = 2 * be_fo_get_server_count(op->conn_cache->be, op->conn_cache->service->name) - 1;
    if (max_retries < 1) {
        max_retries = 1;
    }

    return op->reconnect_retry_count < max_retries;
}

/* Destructor for operation connection request */
static int sdap_id_op_connect_state_destroy(void *pvt)
{
    struct sdap_id_op_connect_state *state = talloc_get_type(pvt,
                                             struct sdap_id_op_connect_state);
    if (state->op != NULL) {
        /* clear destroyed connection request */
        state->op->connect_req = NULL;
    }

    return 0;
}

/* Begin to connect to LDAP server */
struct tevent_req *sdap_id_op_connect_send(struct sdap_id_op *op,
                                           TALLOC_CTX *memctx,
                                           int *ret_out)
{
    struct tevent_req *req = NULL;
    struct sdap_id_op_connect_state *state;
    int ret = EOK;

    if (!memctx) {
        DEBUG(1, ("Bug: no memory context passed.\n"));
        ret = EINVAL;
        goto done;
    }

    if (op->connect_req) {
        /* Connection already in progress, invalid operation */
        DEBUG(1, ("Bug: connection request is already running or completed and leaked.\n"));
        ret = EINVAL;
        goto done;
    }

    req = tevent_req_create(memctx, &state, struct sdap_id_op_connect_state);
    if (!req) {
        ret = ENOMEM;
        goto done;
    }

    talloc_set_destructor((void*)state, sdap_id_op_connect_state_destroy);

    state->op = op;
    op->connect_req = req;

    if (op->conn_data) {
        /* If the operation is already connected,
         * reuse existing connection regardless of its status */
        DEBUG(9, ("reusing operation connection\n"));
        ret = EOK;
        goto done;
    }

    ret = sdap_id_op_connect_step(req);
    if (ret != EOK) {
        goto done;
    }

done:
    if (ret != EOK) {
        talloc_zfree(req);
    } else if (op->conn_data && !op->conn_data->connect_req) {
        /* Connection is already established */
        tevent_req_done(req);
        tevent_req_post(req, op->conn_cache->be->ev);
    }

    if (ret_out) {
        *ret_out = ret;
    }

    return req;
}

/* Begin a connection retry to LDAP server */
static int sdap_id_op_connect_step(struct tevent_req *req)
{
    struct sdap_id_op_connect_state *state = tevent_req_data(req, struct sdap_id_op_connect_state);
    struct sdap_id_op *op = state->op;
    struct sdap_id_conn_cache *conn_cache = op->conn_cache;

    int ret = EOK;
    struct sdap_id_conn_data *conn_data;
    struct tevent_req *subreq = NULL;

    /* Try to reuse context cached connection */
    conn_data = conn_cache->cached_connection;
    if (conn_data) {
        if (conn_data->connect_req) {
            DEBUG(9, ("waiting for connection to complete\n"));
            sdap_id_op_hook_conn_data(op, conn_data);
            goto done;
        }

        if (sdap_can_reuse_connection(conn_data)) {
            DEBUG(9, ("reusing cached connection\n"));
            sdap_id_op_hook_conn_data(op, conn_data);
            goto done;
        }

        DEBUG(9, ("releasing expired cached connection\n"));
        conn_cache->cached_connection = NULL;
        sdap_id_release_conn_data(conn_data);
    }

    DEBUG(9, ("beginning to connect\n"));

    conn_data = talloc_zero(conn_cache, struct sdap_id_conn_data);
    if (!conn_data) {
        ret = ENOMEM;
        goto done;
    }

    talloc_set_destructor(conn_data, sdap_id_conn_data_destroy);

    conn_data->conn_cache = conn_cache;
    subreq = sdap_cli_connect_send(conn_data, conn_cache->be->ev,
                                   conn_cache->opts, conn_cache->be,
                                   conn_cache->service, false);
    if (!subreq) {
        ret = ENOMEM;
        goto done;
    }

    tevent_req_set_callback(subreq, sdap_id_op_connect_done, conn_data);
    conn_data->connect_req = subreq;

    DLIST_ADD(conn_cache->connections, conn_data);
    conn_cache->cached_connection = conn_data;

    sdap_id_op_hook_conn_data(op, conn_data);

done:
    if (ret != EOK && conn_data) {
        sdap_id_release_conn_data(conn_data);
    }

    if (ret != EOK) {
        talloc_zfree(subreq);
    }

    return ret;
}

/* Subrequest callback for connection completion */
static void sdap_id_op_connect_done(struct tevent_req *subreq)
{
    struct sdap_id_conn_data *conn_data = tevent_req_callback_data(subreq,
                                                                   struct sdap_id_conn_data);
    struct sdap_id_conn_cache *conn_cache = conn_data->conn_cache;