sbus: move iface and object path code to separate file

This is done to better distinguish between connection code and interface
stuff. It will help with orientation and thus simplify next changes.

Preparation for:
https://fedorahosted.org/sssd/ticket/2339

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

1 files changed, 203 insertions, 0 deletions

diff --git a/src/sbus/sssd_dbus_interface.c b/src/sbus/sssd_dbus_interface.c
new file mode 100644
index 000000000..ab1bdbe9b
--- /dev/null
+++ b/src/sbus/sssd_dbus_interface.c
@@ -0,0 +1,203 @@
+/*
+    Authors:
+        Pavel Březina <pbrezina@redhat.com>
+
+    Copyright (C) 2014 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 <talloc.h>
+#include <dbus/dbus.h>
+
+#include "util/util.h"
+#include "sbus/sssd_dbus.h"
+#include "sbus/sssd_dbus_private.h"
+
+DBusObjectPathVTable dbus_object_path_vtable =
+    { NULL, sbus_message_handler, NULL, NULL, NULL, NULL };
+
+static char *sbus_iface_get_reg_path(TALLOC_CTX *mem_ctx,
+                                     const char *path,
+                                     bool fallback)
+{
+    char *reg_path;
+
+    reg_path = talloc_strdup(mem_ctx, path);
+    if (reg_path == NULL) return NULL;
+
+    if (fallback) {
+        reg_path[strlen(path)-1] = '\0';
+    }
+    return reg_path;
+}
+
+static bool path_in_interface_list(struct sbus_interface_p *list,
+                                   const char *path)
+{
+    struct sbus_interface_p *iter;
+
+    if (!list || !path) {
+        return false;
+    }
+
+    iter = list;
+    while (iter != NULL) {
+        if (strcmp(iter->intf->path, path) == 0) {
+            return true;
+        }
+        iter = iter->next;
+    }
+
+    return false;
+}
+
+void sbus_unreg_object_paths(struct sbus_connection *conn)
+{
+    struct sbus_interface_p *iter = conn->intf_list;
+
+    while (iter != NULL) {
+        dbus_connection_unregister_object_path(conn->dbus.conn,
+                                               iter->intf->path);
+        iter = iter->next;
+    }
+}
+
+static bool sbus_fb_path_has_prefix(const char *path, const char *prefix)
+{
+    /* strlen-1 because we don't want to match the trailing '*' */
+    if (strncmp(path, prefix, strlen(prefix)-1) == 0) {
+        return true;
+    }
+
+    return false;
+}
+
+static bool sbus_path_has_fallback(const char *path)
+{
+    char *wildcard;
+
+    wildcard = strrchr(path, '*');
+    if (wildcard != NULL) {
+        /* This path was registered as fallback */
+        if (*(wildcard + 1) != '\0') {
+            /* Wildcard is only allowed as the last character in the path */
+            return false;
+        }
+        return true;
+    }
+
+    return false;
+}
+
+bool sbus_iface_handles_path(struct sbus_interface_p *intf_p,
+                             const char *path)
+{
+    if (sbus_path_has_fallback(intf_p->intf->path)) {
+        return sbus_fb_path_has_prefix(path, intf_p->intf->path);
+    }
+
+    return strcmp(path, intf_p->intf->path) == 0;
+}
+
+static struct sbus_interface *
+sbus_new_interface(TALLOC_CTX *mem_ctx,
+                   const char *object_path,
+                   struct sbus_vtable *iface_vtable,
+                   void *instance_data)
+{
+    struct sbus_interface *intf;
+
+    intf = talloc_zero(mem_ctx, struct sbus_interface);
+    if (intf == NULL) {
+        DEBUG(SSSDBG_FATAL_FAILURE, "Cannot allocate a new sbus_interface.\n");
+        return NULL;
+    }
+
+    intf->path = talloc_strdup(intf, object_path);
+    if (intf->path == NULL) {
+        DEBUG(SSSDBG_FATAL_FAILURE, "Cannot duplicate object path.\n");
+        talloc_free(intf);
+        return NULL;
+    }
+
+    intf->vtable = iface_vtable;
+    intf->instance_data = instance_data;
+    return intf;
+}
+
+int sbus_conn_register_iface(struct sbus_connection *conn,
+                             struct sbus_vtable *iface_vtable,
+                             const char *object_path,
+                             void *pvt)
+{
+    struct sbus_interface_p *intf_p;
+    struct sbus_interface *intf;
+    dbus_bool_t dbret;
+    const char *path;
+    bool fallback;
+
+    intf = sbus_new_interface(conn, object_path, iface_vtable, pvt);
+    if (intf == NULL) {
+        return ENOMEM;
+    }
+
+    if (!conn || !intf->vtable || !intf->vtable->meta) {
+        return EINVAL;
+    }
+
+    path = intf->path;
+    fallback = sbus_path_has_fallback(path);
+
+    if (path_in_interface_list(conn->intf_list, path)) {
+        DEBUG(SSSDBG_FATAL_FAILURE,
+              "Cannot add method context with identical path.\n");
+        return EINVAL;
+    }
+
+    intf_p = talloc_zero(conn, struct sbus_interface_p);
+    if (!intf_p) {
+        return ENOMEM;
+    }
+    intf_p->conn = conn;
+    intf_p->intf = intf;
+    intf_p->reg_path = sbus_iface_get_reg_path(intf_p, path, fallback);
+    if (intf_p->reg_path == NULL) {
+        return ENOMEM;
+    }
+
+    DLIST_ADD(conn->intf_list, intf_p);
+
+    DEBUG(SSSDBG_TRACE_LIBS, "Will register path %s with%s fallback\n",
+                             intf_p->reg_path, fallback ? "" : "out");
+
+    if (fallback) {
+        dbret = dbus_connection_register_fallback(conn->dbus.conn,
+                                                  intf_p->reg_path,
+                                                  &dbus_object_path_vtable,
+                                                  intf_p);
+    } else {
+        dbret = dbus_connection_register_object_path(conn->dbus.conn,
+                                                     intf_p->reg_path,
+                                                     &dbus_object_path_vtable,
+                                                     intf_p);
+    }
+    if (!dbret) {
+        DEBUG(SSSDBG_FATAL_FAILURE,
+              "Could not register object path to the connection.\n");
+        return ENOMEM;
+    }
+
+    return EOK;
+}