From 72dac079fbac16ea9dee6de544bdc7ed24a5e208 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Wed, 12 Jun 2019 16:21:45 +0200
Subject: Add RPC method "warn" to show messge to users

Only usable by root.
---
 src/main.c |  8 ++++++++
 src/main.h |  2 ++
 src/rpc.c  |  7 +++++++
 src/warn.c | 11 ++++++++---
 src/warn.h |  2 ++
 5 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/src/main.c b/src/main.c
index 81879b5..a823e03 100644
--- a/src/main.c
+++ b/src/main.c
@@ -558,3 +558,11 @@ void main_queueAction( enum Shutdown action, int delta )
     }
 }
 
+void main_warnAll( const char *message )
+{
+    for ( int idx = 0; idx < userCount; ++idx ) {
+        showWarning( &users[idx], "Warning", message );
+    }
+}
+
+
diff --git a/src/main.h b/src/main.h
index 2c792ac..b1cd420 100644
--- a/src/main.h
+++ b/src/main.h
@@ -23,4 +23,6 @@ struct user* main_getUser( const char *terminal );
 
 void main_queueAction( enum Shutdown action, int seconds );
 
+void main_warnAll( const char *message );
+
 #endif
diff --git a/src/rpc.c b/src/rpc.c
index a563f36..823bcca 100644
--- a/src/rpc.c
+++ b/src/rpc.c
@@ -196,6 +196,13 @@ static void handleClient( int fd, struct ucred *creds )
                 SENDSTRING( fd, "ok" );
             }
         }
+    } else if ( strncmp( buffer, "warn ", 5 ) == 0 ) {
+        if ( creds->uid != 0 ) {
+            SENDSTRING( fd, "error only root can do this" );
+        } else {
+            main_warnAll( buffer + 5 );
+            SENDSTRING( fd, "ok" );
+        }
     } else {
         SENDSTRING( fd, "error unknown command" );
     }
diff --git a/src/warn.c b/src/warn.c
index 6dfd427..7b1ec8e 100644
--- a/src/warn.c
+++ b/src/warn.c
@@ -57,6 +57,11 @@ void warnUser( struct user *usr, enum Warning what, int seconds )
 	seconds %= 60;
 	char buffer[1000];
 	snprintf( buffer, sizeof(buffer), warning->message, minutes, seconds, minutes, seconds );
+	showWarning( usr, warning->title, buffer );
+}
+
+void showWarning( const struct user *usr, const char *title, const char *body )
+{
 	// Text or X11 warning
 	if ( *usr->display ) {
 		// notify-send
@@ -66,7 +71,7 @@ void warnUser( struct user *usr, enum Warning what, int seconds )
 			if ( usr->xauth[0] != '\0' && usr->xauth[0] != '-' ) {
 				setenv( "XAUTHORITY", usr->xauth, 1 );
 			}
-			run( false, "notify-send", "-t", "15000", warning->title, buffer, (char*)NULL );
+			run( false, "notify-send", "-t", "15000", title, body, (char*)NULL );
 		}
 	} else {
 		// write to device
@@ -76,9 +81,9 @@ void warnUser( struct user *usr, enum Warning what, int seconds )
 		if ( fh == NULL )
 			return;
 		fputs( "\n\n****************************\n", fh );
-		fputs( warning->title, fh );
+		fputs( title, fh );
 		fputs( "\n****************************\n", fh );
-		fputs( buffer, fh );
+		fputs( body, fh );
 		fputs( "\n****************************\n\n", fh );
 		fclose( fh );
 	}
diff --git a/src/warn.h b/src/warn.h
index c414378..43af832 100644
--- a/src/warn.h
+++ b/src/warn.h
@@ -14,5 +14,7 @@ enum Warning
 
 void warnUser( struct user *usr, enum Warning what, int seconds );
 
+void showWarning( const struct user *usr, const char *title, const char *body );
+
 #endif
 
-- 
cgit v1.2.3-55-g7522