From 899c001afbc766fe6dd9e0c3c5463be1162294b5 Mon Sep 17 00:00:00 2001
From: ccppi <ccppi3@kolabnow.ch>
Date: Wed, 4 Sep 2024 13:34:10 +0200
Subject: [PATCH] first systemd call via dbus

---
 main.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 93 insertions(+), 7 deletions(-)

diff --git a/main.c b/main.c
index 22a86b9..2b507fb 100644
--- a/main.c
+++ b/main.c
@@ -4,6 +4,7 @@
 #include<dbus/dbus.h>
 
 int gotify_message(char *,char *,char *);
+int systemdCall(DBusConnection *);
 /*
  *sytemctl show gotify-server | grep PID
  * */
@@ -11,26 +12,46 @@ int gotify_message(char *,char *,char *);
 int main(void)
 {
 	unsigned long uid;
-	int ret;
+	int ret,i;
+
+    char **objects = NULL;
 	dbus_bool_t allow_user=0;
 	DBusConnection *connection=NULL;
 	DBusError error;
+
 	
 	dbus_error_init(&error);
-	connection = dbus_bus_get(DBUS_BUS_SYSTEM,&error);
-	
+	connection = dbus_bus_get(DBUS_BUS_SESSION,&error);//DBUS_BUS_SYSTEM
 	if(dbus_error_is_set(&error))
 	{
 		fprintf(stderr,"%s",error.message);
 		return -1;
 	}	
-
 	printf("This is my unique dbus name: %s\n",dbus_bus_get_unique_name(connection));
-	
+
+    ret = dbus_bus_request_name(connection,"test.method.client",DBUS_NAME_FLAG_REPLACE_EXISTING,&error);
+	if(dbus_error_is_set(&error))
+	{
+		fprintf(stderr,"%s",error.message);
+		return -1;
+    }
+    else
+    {
+        printf("name requested from dbus: %d\n",ret);
+    }    
+
 	dbus_connection_set_allow_anonymous(connection,allow_user);
 	printf("user auth dbus requ: %d\n",allow_user);
-	
-	dbus_connection_list_registered(connection,"/",
+	if(!dbus_connection_list_registered(connection,"/",&objects))
+    {
+            for(i=0;objects[i];i++)
+            {
+                    printf("\nobject dbus: %s",objects[i]);
+            }
+    }
+    else{
+            printf("dbus_connection_list_registered error\n");
+    }
 
 	if((ret=dbus_connection_get_unix_user(connection,&uid))==1)
 	{
@@ -41,7 +62,11 @@ int main(void)
 		printf("NO userID set in dbus session: %d\n",ret);
 	}
 
+    //org/freedesktop/systemd1
+    systemdCall(connection);
+
 	gotify_message("https://5ccppi.org:4433/message?token=ApPFbwayM5zDXf3","anothertitle","anothermessage");
+
 	return 0;
 }
 
@@ -80,4 +105,65 @@ int gotify_message(char *url,char *title,char *message)
 	return 0;
 }
 
+int systemdCall(DBusConnection *connection)
+{
+        
+	DBusError error;
+    DBusMessage *msg;
+    DBusMessage *ret_msg;
+    DBusMessageIter iter;
 
+
+
+    char *reply_msg=NULL;
+    char *param="timers.target";
+    int ret1;
+
+	dbus_error_init(&error);
+
+
+    msg = dbus_message_new_method_call("org.freedesktop.systemd1","/org/freedesktop/systemd1","org.freedesktop.systemd1.Manager","GetUnit");
+    if(NULL == msg)
+    {
+            fprintf(stderr,"Message null, no message created");
+            return 1;
+    }
+    else
+    {
+            printf("message created!\n");
+    }
+    
+    dbus_message_iter_init_append(msg,&iter);
+    if(!dbus_message_iter_append_basic(&iter,DBUS_TYPE_STRING,&param))
+    {
+            fprintf(stderr,"Error appending");
+            return -1;
+    }
+    else{
+            printf("message appended");
+    }
+    ret_msg = dbus_connection_send_with_reply_and_block(connection,msg,DBUS_TIMEOUT_INFINITE,&error);
+    if(ret_msg == NULL)
+    {
+            fprintf(stderr,"error ond receiving message from peer\n");
+    }
+    else
+    {
+            DBusMessageIter reply_iter;
+            dbus_message_iter_init(ret_msg,&reply_iter);
+            ret1=dbus_message_iter_get_arg_type(&reply_iter);
+            if(ret1 == *DBUS_TYPE_OBJECT_PATH_AS_STRING)
+            {
+                    printf("succesfull received message\narg type %c\n",ret1);
+                    dbus_message_iter_get_basic(&reply_iter,&reply_msg);
+                    printf("returned value: %s\n",reply_msg);
+            }
+
+    }
+	if(dbus_error_is_set(&error))
+	{
+		fprintf(stderr,"%s",error.message);
+		return -1;
+	}	
+    return 0;
+}