Add support for dbus comunication in the nss service

Add utility function in confdb
Make all component fetch the dbus socket from the confdb

7 files changed, 197 insertions, 41 deletions

diff --git a/server/confdb/confdb.c b/server/confdb/confdb.c
index 18b369caf..1dd799827 100644
--- a/server/confdb/confdb.c
+++ b/server/confdb/confdb.c
@@ -282,6 +282,40 @@ done:
     return ret;
 }
 
+int confdb_get_string(struct confdb_ctx *cdb, TALLOC_CTX *ctx,
+                      const char *section, const char *attribute,
+                      const char *defstr, char **result)
+{
+    char **values;
+    char *restr;
+    int ret;
+
+    ret = confdb_get_param(cdb, ctx, section, attribute, &values);
+    if (ret != EOK) {
+        return ret;
+    }
+
+    if (values[0]) {
+        if (values[1] != NULL) {
+            /* too many values */
+            talloc_free(values);
+            return EINVAL;
+        }
+        restr = talloc_steal(ctx, values[0]);
+    } else {
+        restr = talloc_strdup(ctx, defstr);
+    }
+    if (!restr) {
+        talloc_free(values);
+        return ENOMEM;
+    }
+
+    talloc_free(values);
+
+    *result = restr;
+    return EOK;
+}
+
 static int confdb_test(struct confdb_ctx *cdb)
 {
     char **values;
diff --git a/server/confdb/confdb.h b/server/confdb/confdb.h
index 8becdf99c..b8b685311 100644
--- a/server/confdb/confdb.h
+++ b/server/confdb/confdb.h
@@ -34,6 +34,10 @@ int confdb_get_param(struct confdb_ctx *cdb,
                      const char *attribute,
                      char ***values);
 
+int confdb_get_string(struct confdb_ctx *cdb, TALLOC_CTX *ctx,
+                      const char *section, const char *attribute,
+                      const char *defstr, char **result);
+
 int confdb_init(TALLOC_CTX *mem_ctx,
                 struct event_context *ev,
                 struct confdb_ctx **cdb_ctx);
diff --git a/server/monitor.c b/server/monitor.c
index f7ba80098..5574d70c8 100644
--- a/server/monitor.c
+++ b/server/monitor.c
@@ -32,9 +32,6 @@
 #include "sbus/sssd_dbus.h"
 #include "sbus_interfaces.h"
 
-/* TODO: get this value from LDB */
-#define DBUS_ADDRESS "unix:path=/var/lib/sss/pipes/private/dbus"
-
 struct mt_ctx {
     struct event_context *ev;
     struct confdb_ctx *cdb;
@@ -84,8 +81,16 @@ struct sbus_method monitor_methods[] = {
 static int monitor_dbus_init(struct mt_ctx *ctx)
 {
     struct sbus_method_ctx *sd_ctx;
+    char *sbus_address;
     int ret;
 
+    ret = confdb_get_string(ctx->cdb, ctx,
+                            "config.services.monitor", "sbusAddress",
+                            DEFAULT_SBUS_ADDRESS, &sbus_address);
+    if (ret != EOK) {
+        return ret;
+    }
+
     sd_ctx = talloc_zero(ctx, struct sbus_method_ctx);
     if (!sd_ctx) {
         return ENOMEM;
@@ -105,7 +110,7 @@ static int monitor_dbus_init(struct mt_ctx *ctx)
     sd_ctx->methods = monitor_methods;
     sd_ctx->message_handler = NULL; /* Use the default message_handler */
 
-    ret = sbus_new_server(ctx->ev, sd_ctx, DBUS_ADDRESS, dbus_service_init);
+    ret = sbus_new_server(ctx->ev, sd_ctx, sbus_address, dbus_service_init);
 
     return ret;
 }
diff --git a/server/nss/nsssrv.c b/server/nss/nsssrv.c
index d1dfa3444..04eead6dd 100644
--- a/server/nss/nsssrv.c
+++ b/server/nss/nsssrv.c
@@ -35,6 +35,16 @@
 #include "nss/nsssrv.h"
 #include "nss/nsssrv_ldb.h"
 #include "confdb/confdb.h"
+#include "dbus/dbus.h"
+#include "sbus/sssd_dbus.h"
+#include "sbus_interfaces.h"
+
+static int provide_identity(DBusMessage *message, void *data, DBusMessage **r);
+
+struct sbus_method nss_sbus_methods[] = {
+    {SERVICE_METHOD_IDENTITY, provide_identity},
+    {NULL, NULL}
+};
 
 static void set_nonblocking(int fd)
 {
@@ -193,16 +203,108 @@ static void accept_fd_handler(struct event_context *ev,
     return;
 }
 
+static int provide_identity(DBusMessage *message, void *data, DBusMessage **r)
+{
+    dbus_uint16_t version = NSS_SBUS_SERVICE_VERSION;
+    const char *name = NSS_SBUS_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 nss_sbus_init(struct nss_ctx *nctx)
+{
+    struct sbus_method_ctx *cli_sm_ctx;
+    struct sbus_method_ctx *srv_sm_ctx;
+    struct nss_sbus_ctx *ns_ctx;
+    DBusConnection *dbus_conn;
+    char *sbus_address;
+    int ret;
+
+    ret = confdb_get_string(nctx->cdb, nctx,
+                            "config.services.monitor", "sbusAddress",
+                            DEFAULT_SBUS_ADDRESS, &sbus_address);
+    if (ret != EOK) {
+        return ret;
+    }
+
+    ns_ctx = talloc(nctx, struct nss_sbus_ctx);
+    if (!ns_ctx) {
+        return ENOMEM;
+    }
+    ns_ctx->ev = nctx->ev;
+
+    ret = sbus_new_connection(ns_ctx, ns_ctx->ev,
+                              sbus_address,
+                              &ns_ctx->scon_ctx, NULL);
+    if (ret != EOK) {
+        talloc_free(ns_ctx);
+        return ret;
+    }
+    dbus_conn = sbus_get_connection(ns_ctx->scon_ctx);
+    dbus_connection_set_exit_on_disconnect(dbus_conn, TRUE);
+
+    /* set up handler for service methods */
+    srv_sm_ctx = talloc_zero(ns_ctx, struct sbus_method_ctx);
+    if (!srv_sm_ctx) {
+        talloc_free(ns_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(ns_ctx);
+        return ENOMEM;
+    }
+    srv_sm_ctx->methods = nss_sbus_methods;
+    sbus_conn_add_method_ctx(ns_ctx->scon_ctx, srv_sm_ctx);
+
+    /* set up client stuff */
+    cli_sm_ctx = talloc(ns_ctx, struct sbus_method_ctx);
+    if (!cli_sm_ctx) {
+        talloc_free(ns_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(ns_ctx);
+        return ENOMEM;
+    }
+    ns_ctx->sm_ctx = cli_sm_ctx;
+
+    nctx->ns_ctx = ns_ctx;
+
+    return EOK;
+}
+
 /* create a unix socket and listen to it */
-static void set_unix_socket(struct event_context *ev,
-                            struct nss_ctx *nctx,
-                            const char *sock_name)
+static int set_unix_socket(struct nss_ctx *nctx)
 {
     struct sockaddr_un addr;
+    int ret;
+
+    ret = confdb_get_string(nctx->cdb, nctx,
+                            "config.services.nss", "unixSocket",
+                            SSS_NSS_SOCKET_NAME, &nctx->sock_name);
+    if (ret != EOK) {
+        return ret;
+    }
 
     nctx->lfd = socket(AF_UNIX, SOCK_STREAM, 0);
     if (nctx->lfd == -1) {
-        return;
+        return EIO;
     }
 
     /* Set the umask so that permissions are set right on the socket.
@@ -214,76 +316,73 @@ static void set_unix_socket(struct event_context *ev,
 
     memset(&addr, 0, sizeof(addr));
     addr.sun_family = AF_UNIX;
-    strncpy(addr.sun_path, sock_name, sizeof(addr.sun_path));
+    strncpy(addr.sun_path, nctx->sock_name, sizeof(addr.sun_path));
 
     /* make sure we have no old sockets around */
-    unlink(sock_name);
+    unlink(nctx->sock_name);
 
     if (bind(nctx->lfd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
-        DEBUG(0,("Unable to bind on socket '%s'\n", sock_name));
+        DEBUG(0,("Unable to bind on socket '%s'\n", nctx->sock_name));
         goto failed;
     }
     if (listen(nctx->lfd, 10) != 0) {
-        DEBUG(0,("Unable to listen on socket '%s'\n", sock_name));
+        DEBUG(0,("Unable to listen on socket '%s'\n", nctx->sock_name));
         goto failed;
     }
 
-    nctx->lfde = event_add_fd(ev, nctx, nctx->lfd,
-                                 EVENT_FD_READ, accept_fd_handler, nctx);
+    nctx->lfde = event_add_fd(nctx->ev, nctx, nctx->lfd,
+                              EVENT_FD_READ, accept_fd_handler, nctx);
 
 	/* we want default permissions on created files to be very strict,
 	   so set our umask to 0177 */
 	umask(0177);
-    return;
+    return EOK;
 
 failed:
 	/* we want default permissions on created files to be very strict,
 	   so set our umask to 0177 */
 	umask(0177);
     close(nctx->lfd);
+    return EIO;
 }
 
 void nss_task_init(struct task_server *task)
 {
-    struct confdb_ctx *cdb;
     struct nss_ctx *nctx;
-    const char *sock_name;
-    char **values;
     int ret;
 
     task_server_set_title(task, "sssd[nsssrv]");
 
-    ret = confdb_init(task, task->event_ctx, &cdb);
-    if (ret != EOK) {
-        task_server_terminate(task, "fatal error initializing confdb\n");
-        return;
-    }
-
     nctx = talloc_zero(task, struct nss_ctx);
     if (!nctx) {
         task_server_terminate(task, "fatal error initializing nss_ctx\n");
         return;
     }
+    nctx->ev = task->event_ctx;
     nctx->task = task;
 
-    ret = confdb_get_param(cdb, nctx,
-                           "config.services.nss", "unixSocket", &values);
+    ret = confdb_init(task, task->event_ctx, &nctx->cdb);
     if (ret != EOK) {
-        task_server_terminate(task, "fatal error reading configuration\n");
+        task_server_terminate(task, "fatal error initializing confdb\n");
         return;
     }
-    if (values[0]) {
-        sock_name = talloc_steal(nctx, values[0]);
-    } else {
-        sock_name = talloc_strdup(nctx, SSS_NSS_SOCKET_NAME);
-    }
-    talloc_free(values);
 
-    set_unix_socket(task->event_ctx, nctx, sock_name);
+    ret = nss_sbus_init(nctx);
+    if (ret != EOK) {
+        task_server_terminate(task, "fatal error setting up message bus\n");
+        return;
+    }
 
-    ret = nss_ldb_init(nctx, task->event_ctx, cdb, &nctx->lctx);
+    ret = nss_ldb_init(nctx, nctx->ev, nctx->cdb, &nctx->lctx);
     if (ret != EOK) {
         task_server_terminate(task, "fatal error initializing nss_ctx\n");
         return;
     }
+
+    /* after all initializations we are ready to listen on our socket */
+    ret = set_unix_socket(nctx);
+    if (ret != EOK) {
+        task_server_terminate(task, "fatal error initializing socket\n");
+        return;
+    }
 }
diff --git a/server/nss/nsssrv.h b/server/nss/nsssrv.h
index e00ccced5..300b8af31 100644
--- a/server/nss/nsssrv.h
+++ b/server/nss/nsssrv.h
@@ -29,14 +29,27 @@
 #include "ldb.h"
 #include "../nss_client/sss_nss.h"
 
+#define NSS_SBUS_SERVICE_VERSION 0x0001
+#define NSS_SBUS_SERVICE_NAME "NSS"
+
 struct nss_ldb_ctx;
 struct getent_ctx;
 
+struct nss_sbus_ctx {
+    struct event_context *ev;
+    struct sbus_method_ctx *sm_ctx;
+    struct sbus_conn_ctx *scon_ctx;
+};
+
 struct nss_ctx {
+    struct event_context *ev;
     struct task_server *task;
     struct fd_event *lfde;
     int lfd;
     struct nss_ldb_ctx *lctx;
+    struct confdb_ctx *cdb;
+    char *sock_name;
+    struct nss_sbus_ctx *ns_ctx;
 };
 
 struct cli_ctx {
diff --git a/server/sbus/tests/test_client.c b/server/sbus/tests/test_client.c
index bd7f42d57..06cd11338 100644
--- a/server/sbus/tests/test_client.c
+++ b/server/sbus/tests/test_client.c
@@ -7,9 +7,6 @@
 #include "sbus/sssd_dbus.h"
 #include "sbus_interfaces.h"
 
-/* TODO: get this value from LDB */
-#define DBUS_ADDRESS "unix:path=/var/lib/sss/pipes/private/dbus"
-
 /* Identity */
 #define TEST_CLIENT_NAME "testclient"
 #define TEST_CLIENT_VERSION 1
@@ -149,13 +146,13 @@ int main (int argc, const char *argv[])
         printf("Out of memory!?\n");
         exit(1);
     }
-    
+
     test_ctx = talloc(event_ctx, struct test_cli_ctx);
     if (!test_ctx) {
         printf("Out of memory!?\n");
         exit(1);
     }
-    
+
     test_ctx->ev = event_ctx;
     ctx->interface = talloc_strdup(ctx, MONITOR_DBUS_INTERFACE);
     ctx->path = talloc_strdup(ctx, MONITOR_DBUS_PATH);
@@ -164,7 +161,9 @@ int main (int argc, const char *argv[])
         exit(1);
     }
 
-    ret = sbus_new_connection(test_ctx, test_ctx->ev, DBUS_ADDRESS, &(test_ctx->dct_ctx), NULL);
+    ret = sbus_new_connection(test_ctx, test_ctx->ev,
+                              DEFAULT_SBUS_ADDRESS,
+                              &test_ctx->dct_ctx, NULL);
     if (ret != EOK) {
         exit(1);
     }
diff --git a/server/sbus_interfaces.h b/server/sbus_interfaces.h
index 5c6c52e74..106a54957 100644
--- a/server/sbus_interfaces.h
+++ b/server/sbus_interfaces.h
@@ -37,3 +37,5 @@
 /* Service Methods */
 #define SERVICE_METHOD_IDENTITY "getIdentity"
 
+#define DEFAULT_SBUS_ADDRESS "unix:path=/var/lib/sss/pipes/private/dbus"
+