Add some infrastructure code to add data providers.

This currently breacks the dameon because of a problem with
destroying the monitor dbus server in the children after
fork()

7 files changed, 529 insertions, 10 deletions

diff --git a/server/monitor.c b/server/monitor.c
index b85b7d60..40f25c33 100644
--- a/server/monitor.c
+++ b/server/monitor.c
@@ -300,6 +300,14 @@ int start_monitor(TALLOC_CTX *mem_ctx,
     if (ret != EOK)
         return ret;
 
+    /* Initialize D-BUS Server
+     * The monitor will act as a D-BUS server for all
+     * SSSD processes */
+    ret = monitor_dbus_init(ctx);
+    if (ret != EOK) {
+        return ret;
+    }
+
     for (i = 0; ctx->services[i]; i++) {
 
         svc = talloc_zero(ctx, struct mt_svc);
@@ -322,14 +330,6 @@ int start_monitor(TALLOC_CTX *mem_ctx,
         set_tasks_checker(svc);
     }
 
-    /* Initialize D-BUS Server
-     * The monitor will act as a D-BUS server for all
-     * SSSD processes */
-    ret = monitor_dbus_init(ctx);
-    if (ret != EOK) {
-        return ret;
-    }
-
     return EOK;
 }
 
@@ -355,7 +355,8 @@ static int mt_conn_destructor(void *ptr)
  * method on the new client). The reply callback for this request
  * should set the connection destructor appropriately.
  */
-static int dbus_service_init(struct sbus_conn_ctx *conn_ctx, void *data) {
+static int dbus_service_init(struct sbus_conn_ctx *conn_ctx, void *data)
+{
     struct mt_ctx *ctx;
     struct mt_svc *svc;
     struct mt_conn *mt_conn;
diff --git a/server/providers/data_provider.c b/server/providers/data_provider.c
new file mode 100644
index 00000000..43c80128
--- /dev/null
+++ b/server/providers/data_provider.c
@@ -0,0 +1,414 @@
+/*
+   SSSD
+
+   Data Provider
+
+   Copyright (C) Simo Sorce <ssorce@redhat.com>	2008
+
+   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 <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <string.h>
+#include <sys/time.h>
+#include <errno.h>
+#include "ldb.h"
+#include "ldb_errors.h"
+#include "util/util.h"
+#include "service.h"
+#include "confdb/confdb.h"
+#include "dbus/dbus.h"
+#include "sbus/sssd_dbus.h"
+#include "sbus_interfaces.h"
+#include "util/btreemap.h"
+#include "data_provider.h"
+
+static int provide_identity(DBusMessage *message, void *data, DBusMessage **r);
+static int reply_ping(DBusMessage *message, void *data, DBusMessage **r);
+
+struct sbus_method mon_sbus_methods[] = {
+    {SERVICE_METHOD_IDENTITY, provide_identity},
+    {SERVICE_METHOD_PING, reply_ping},
+    {NULL, NULL}
+};
+
+static int provide_identity(DBusMessage *message, void *data, DBusMessage **r)
+{
+    dbus_uint16_t version = DATA_PROVIDER_VERSION;
+    const char *name = DATA_PROVIDER_SERVICE_NAME;
+    DBusMessage *reply;
+    dbus_bool_t ret;
+
+    reply = dbus_message_new_method_return(message);
+    ret = dbus_message_append_args(reply,
+                                   DBUS_TYPE_STRING, &name,
+                                   DBUS_TYPE_UINT16, &version,
+                                   DBUS_TYPE_INVALID);
+    if (!ret) {
+        return EIO;
+    }
+
+    *r = reply;
+    return EOK;
+}
+
+static int reply_ping(DBusMessage *message, void *data, DBusMessage **r)
+{
+    DBusMessage *reply;
+    dbus_bool_t ret;
+
+    reply = dbus_message_new_method_return(message);
+    ret = dbus_message_append_args(reply, DBUS_TYPE_INVALID);
+    if (!ret) {
+        return EIO;
+    }
+
+    *r = reply;
+    return EOK;
+}
+
+static int dp_monitor_init(struct dp_ctx *dpctx)
+{
+    struct sbus_method_ctx *cli_sm_ctx;
+    struct sbus_method_ctx *srv_sm_ctx;
+    struct dp_sbus_ctx *sbus_ctx;
+    DBusConnection *dbus_conn;
+    char *sbus_address;
+    int ret;
+
+    ret = confdb_get_string(dpctx->cdb, dpctx,
+                            "config/services/monitor", "sbusAddress",
+                            DEFAULT_SBUS_ADDRESS, &sbus_address);
+    if (ret != EOK) {
+        return ret;
+    }
+
+    sbus_ctx = talloc(dpctx, struct dp_sbus_ctx);
+    if (!sbus_ctx) {
+        return ENOMEM;
+    }
+    sbus_ctx->ev = dpctx->ev;
+
+    ret = sbus_new_connection(sbus_ctx, sbus_ctx->ev,
+                              sbus_address,
+                              &sbus_ctx->scon_ctx, NULL);
+    if (ret != EOK) {
+        talloc_free(sbus_ctx);
+        return ret;
+    }
+    dbus_conn = sbus_get_connection(sbus_ctx->scon_ctx);
+    dbus_connection_set_exit_on_disconnect(dbus_conn, TRUE);
+
+    /* set up handler for service methods */
+    srv_sm_ctx = talloc_zero(sbus_ctx, struct sbus_method_ctx);
+    if (!srv_sm_ctx) {
+        talloc_free(sbus_ctx);
+        return ENOMEM;
+    }
+    srv_sm_ctx->interface = talloc_strdup(srv_sm_ctx, SERVICE_INTERFACE);
+    srv_sm_ctx->path = talloc_strdup(srv_sm_ctx, SERVICE_PATH);
+    if (!srv_sm_ctx->interface || !srv_sm_ctx->path) {
+        talloc_free(sbus_ctx);
+        return ENOMEM;
+    }
+    srv_sm_ctx->methods = mon_sbus_methods;
+    sbus_conn_add_method_ctx(sbus_ctx->scon_ctx, srv_sm_ctx);
+
+    /* set up client stuff */
+    cli_sm_ctx = talloc(sbus_ctx, struct sbus_method_ctx);
+    if (!cli_sm_ctx) {
+        talloc_free(sbus_ctx);
+        return ENOMEM;
+    }
+    cli_sm_ctx->interface = talloc_strdup(cli_sm_ctx, MONITOR_DBUS_INTERFACE);
+    cli_sm_ctx->path = talloc_strdup(cli_sm_ctx, MONITOR_DBUS_PATH);
+    if (!cli_sm_ctx->interface || !cli_sm_ctx->path) {
+        talloc_free(sbus_ctx);
+        return ENOMEM;
+    }
+    sbus_ctx->sm_ctx = cli_sm_ctx;
+
+    dpctx->sbus_ctx = sbus_ctx;
+
+    return EOK;
+}
+
+static int dp_db_init(struct dp_ctx *dpctx)
+{
+    char *ldb_file;
+    int ret;
+
+    ret = confdb_get_string(dpctx->cdb, dpctx,
+                            DATA_PROVIDER_DB_CONF_SEC, "ldbFile",
+                            DATA_PROVIDER_DEF_DB_FILE, &ldb_file);
+    if (ret != EOK) {
+        return ret;
+    }
+
+    dpctx->ldb = ldb_init(dpctx, dpctx->ev);
+    if (!dpctx->ldb) {
+        return EIO;
+    }
+
+    ret = ldb_connect(dpctx->ldb, ldb_file, 0, NULL);
+    if (ret != LDB_SUCCESS) {
+        talloc_free(dpctx->ldb);
+        return EIO;
+    }
+
+    return EOK;
+}
+
+static int check_online(DBusMessage *message, void *data, DBusMessage **r);
+
+struct sbus_method dp_sbus_methods[] = {
+    { DP_METHOD_CHECK_ONLINE, check_online },
+    { NULL, NULL }
+};
+
+static int dbus_dp_init(struct sbus_conn_ctx *conn_ctx, void *data)
+{
+    struct dp_ctx *dpctx;
+    struct dp_client *dpcli;
+    DBusConnection *conn;
+    DBusError dbus_error;
+
+    dpctx = talloc_get_type(data, struct dp_ctx);
+    conn = sbus_get_connection(conn_ctx);
+    dbus_error_init(&dbus_error);
+
+    /* hang off this memory to the connection so that when the connection
+     * is freed we can potentially call a destructor */
+
+    dpcli = talloc(conn_ctx, struct dp_client);
+    if (!dpcli) {
+        DEBUG(0,("Out of memory?!\n"));
+        talloc_free(conn_ctx);
+        return ENOMEM;
+    }
+    dpcli->dpctx = dpctx;
+    dpcli->conn = conn;
+
+    /* Attach the client context to the connection context, so that it is
+     * always available when we need to manage the connection. */
+    sbus_conn_set_private_data(conn_ctx, dpcli);
+
+    return EOK;
+}
+
+/* monitor_dbus_init
+ * Set up the monitor service as a D-BUS Server */
+static int dp_srv_init(struct dp_ctx *dpctx)
+{
+    struct sbus_method_ctx *sd_ctx;
+    char *dpbus_address;
+    int ret;
+
+    DEBUG(3, ("Initializing Data Provider D-BUS Server\n"));
+
+    ret = confdb_get_string(dpctx->cdb, dpctx,
+                            "config/services/dataprovider", "dpbusAddress",
+                            DATA_PROVIDER_ADDRESS, &dpbus_address);
+    if (ret != EOK) {
+        return ret;
+    }
+
+    sd_ctx = talloc_zero(dpctx, struct sbus_method_ctx);
+    if (!sd_ctx) {
+        talloc_free(dpbus_address);
+        return ENOMEM;
+    }
+
+    /* Set up globally-available D-BUS methods */
+    sd_ctx->interface = talloc_strdup(sd_ctx, DATA_PROVIDER_DBUS_INTERFACE);
+    if (!sd_ctx->interface) {
+        talloc_free(dpbus_address);
+        talloc_free(sd_ctx);
+        return ENOMEM;
+    }
+    sd_ctx->path = talloc_strdup(sd_ctx, DATA_PROVIDER_DBUS_PATH);
+    if (!sd_ctx->path) {
+        talloc_free(dpbus_address);
+        talloc_free(sd_ctx);
+        return ENOMEM;
+    }
+    sd_ctx->methods = dp_sbus_methods;
+    sd_ctx->message_handler = sbus_message_handler;
+
+    ret = sbus_new_server(dpctx->ev, sd_ctx, dpbus_address,
+                          dbus_dp_init, dpctx);
+
+    return ret;
+}
+
+static int check_online(DBusMessage *message, void *data, DBusMessage **r)
+{
+    return EOK;
+}
+
+/* find list of backends */
+/* find library implementing them */
+/* dload() said library and set up a structure to hold pointers */
+
+static int init_data_providers(struct dp_ctx *dpctx)
+{
+    TALLOC_CTX *tmp_ctx;
+    struct dp_module *module;
+    char **doms;
+    char *sec;
+    char *mod_name;
+    char *path;
+    void *handle;
+    char *mod_init_fn_name;
+    sssm_init_fn_t mod_init_fn;
+    int num_mods;
+    int i, ret;
+
+    tmp_ctx = talloc_new(dpctx);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    ret = confdb_get_domains(dpctx->cdb, tmp_ctx, &doms);
+    if (ret != EOK) {
+        DEBUG(2, ("No domains configured!\n"));
+        return ret;
+    }
+
+    num_mods = 0;
+    for (i = 0; doms[i]; i++) {
+        sec = talloc_asprintf(tmp_ctx, "config/domains/%s", doms[i]);
+        if (!sec) {
+            ret = ENOMEM;
+            goto done;
+        }
+        ret = confdb_get_string(dpctx->cdb, tmp_ctx, sec,
+                                "provider", NULL, &mod_name);
+        if (ret != EOK) {
+            goto done;
+        }
+
+        /* the LOCAL domain does not have a backend at the moment */
+        if (strcasecmp(mod_name, "LOCAL") == 0) {
+            continue;
+        }
+
+        path = talloc_asprintf(tmp_ctx, "%s/libsss_%s.so",
+                               DATA_PROVIDER_PLUGINS_PATH, mod_name);
+
+        handle = dlopen(path, RTLD_NOW);
+        if (!handle) {
+            DEBUG(0, ("Unable to load %s module with path (%s), error: %s\n",
+                      mod_name, path, dlerror()));
+            ret = ELIBACC;
+            goto done;
+        }
+
+        mod_init_fn_name = talloc_asprintf(tmp_ctx, "sssm_%s_init", mod_name);
+        if (!mod_init_fn_name) {
+            ret = ENOMEM;
+            goto done;
+        }
+
+        mod_init_fn = (sssm_init_fn_t)dlsym(handle, mod_init_fn_name);
+        if (!mod_init_fn) {
+            DEBUG(0, ("Unable to load init fn from module %s, error: %s\n",
+                      mod_name, dlerror()));
+            ret = ELIBBAD;
+            goto done;
+        }
+
+        dpctx->modules = talloc_array(tmp_ctx, struct dp_module *, num_mods +1);
+        if (!dpctx->modules) {
+            ret = ENOMEM;
+            goto done;
+        }
+        module = talloc(dpctx->modules, struct dp_module);
+        if (!module) {
+            ret = ENOMEM;
+            goto done;
+        }
+        dpctx->modules[num_mods] = module;
+
+        module->domain = talloc_strdup(dpctx->modules, doms[i]);
+        module->name = talloc_steal(dpctx->modules, mod_name);
+
+        ret = mod_init_fn(module, &module->ops, &module->pvt_data);
+        if (ret != EOK) {
+            DEBUG(0, ("Error (%d) in module (%s) initialization!\n",
+                      ret, mod_name));
+            continue;
+        }
+
+        num_mods++;
+    }
+
+    ret = EOK;
+
+done:
+    talloc_free(doms);
+    return ret;
+}
+
+void dp_task_init(struct task_server *task)
+{
+    struct dp_ctx *dpctx;
+    int ret;
+
+    task_server_set_title(task, "sssd[datap]");
+
+    dpctx = talloc_zero(task, struct dp_ctx);
+    if (!dpctx) {
+        task_server_terminate(task, "fatal error initializing dp_ctx\n");
+        return;
+    }
+    dpctx->ev = task->event_ctx;
+    dpctx->task = task;
+
+    ret = confdb_init(task, task->event_ctx, &dpctx->cdb);
+    if (ret != EOK) {
+        task_server_terminate(task, "fatal error initializing confdb\n");
+        return;
+    }
+
+    ret = dp_db_init(dpctx);
+    if (ret != EOK) {
+        task_server_terminate(task, "fatal error opening database\n");
+        return;
+    }
+
+    ret = dp_monitor_init(dpctx);
+    if (ret != EOK) {
+        task_server_terminate(task, "fatal error setting up monitor bus\n");
+        return;
+    }
+
+    ret = dp_srv_init(dpctx);
+    if (ret != EOK) {
+        task_server_terminate(task, "fatal error setting up server bus\n");
+        return;
+    }
+
+    ret = init_data_providers(dpctx);
+    if (ret != EOK) {
+        task_server_terminate(task, "fatal error initializing data providers\n");
+        return;
+    }
+}
diff --git a/server/providers/data_provider.h b/server/providers/data_provider.h
new file mode 100644
index 00000000..a5c0a417
--- /dev/null
+++ b/server/providers/data_provider.h
@@ -0,0 +1,73 @@
+/*
+   SSSD
+
+   Data Provider, private header file
+
+   Copyright (C) Simo Sorce <ssorce@redhat.com>	2008
+
+   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/>.
+*/
+
+#ifndef __DATA_PROVIDER_H__
+#define __DATA_PROVIDER_H__
+
+#include <stdint.h>
+#include <sys/un.h>
+#include "talloc.h"
+#include "events.h"
+#include "ldb.h"
+
+#define DATA_PROVIDER_VERSION 0x0001
+#define DATA_PROVIDER_SERVICE_NAME "data-provider"
+#define DATA_PROVIDER_ADDRESS "unix:path=/var/lib/sss/pipes/private/dbus-dp"
+
+#define DATA_PROVIDER_DEF_DB_FILE "/var/lib/sss/db/sssd.ldb"
+#define DATA_PROVIDER_DB_CONF_SEC "config/services/nss"
+
+#define DATA_PROVIDER_PLUGINS_PATH "/usr/lib/sssd"
+
+struct dp_mod_ops {
+    int (*check_online)(void *pvt_data, int *reply);
+};
+
+typedef int (*sssm_init_fn_t)(TALLOC_CTX *, struct dp_mod_ops **, void **);
+
+struct dp_module {
+    const char *name;
+    const char *domain;
+    struct dp_mod_ops *ops;
+    void *pvt_data;
+};
+
+struct dp_sbus_ctx {
+    struct event_context *ev;
+    struct sbus_method_ctx *sm_ctx;
+    struct sbus_conn_ctx *scon_ctx;
+};
+
+struct dp_ctx {
+    struct event_context *ev;
+    struct task_server *task;
+    struct confdb_ctx *cdb;
+    struct ldb_context *ldb;
+    struct dp_sbus_ctx *sbus_ctx;
+    struct dp_module **modules;
+};
+
+struct dp_client {
+    struct dp_ctx *dpctx;
+    DBusConnection *conn;
+};
+
+#endif /* __DATA_PROVIDER_ */
diff --git a/server/providers/providers.h b/server/providers/providers.h
new file mode 100644
index 00000000..a1cc1fc4
--- /dev/null
+++ b/server/providers/providers.h
@@ -0,0 +1,22 @@
+/*
+   SSSD
+
+   Data Provider, public header file
+
+   Copyright (C) Simo Sorce <ssorce@redhat.com>	2008
+
+   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/>.
+*/
+
+void dp_task_init(struct task_server *task);
diff --git a/server/sbus_interfaces.h b/server/sbus_interfaces.h
index 2e6372de..b0702309 100644
--- a/server/sbus_interfaces.h
+++ b/server/sbus_interfaces.h
@@ -40,3 +40,9 @@
 
 #define DEFAULT_SBUS_ADDRESS "unix:path=/var/lib/sss/pipes/private/dbus"
 
+/* Data Provider */
+
+#define DATA_PROVIDER_DBUS_INTERFACE "org.freeipa.sssd.dataprovider"
+#define DATA_PROVIDER_DBUS_PATH "/org/freeipa/sssd/dataprovider"
+
+#define DP_METHOD_CHECK_ONLINE "isOnline"
diff --git a/server/server.c b/server/server.c
index d9591997..01bcf29c 100644
--- a/server/server.c
+++ b/server/server.c
@@ -33,6 +33,7 @@
 #include "../ldb/include/ldb.h"
 #include "service.h"
 #include "confdb/confdb.h"
+#include "providers/providers.h"
 #include "monitor.h"
 
 extern void monitor_task_init(struct task_server *task);
@@ -214,6 +215,7 @@ int main(int argc, const char *argv[])
 
 	/* Services */
 	register_server_service("nss", nss_task_init);
+	register_server_service("dp", dp_task_init);
 
     /* the monitor starts the services */
     status = start_monitor(mem_ctx, event_ctx, confdb_ctx);
diff --git a/server/server.mk b/server/server.mk
index 6277a559..ee5f036a 100644
--- a/server/server.mk
+++ b/server/server.mk
@@ -16,7 +16,8 @@ SERVER_OBJ = \
     nss/nsssrv_ldb.o \
     sbus/sssd_dbus_common.o \
     sbus/sssd_dbus_connection.o \
-    sbus/sssd_dbus_server.o
+    sbus/sssd_dbus_server.o \
+	providers/data_provider.o
 
 CLIENT_OBJ = \
     sbus/sssd_dbus_common.o \