Update from Steve Perkins

[ppp.git] / NeXT / Examples / pppkill.c

diff --git a/NeXT/Examples/pppkill.c b/NeXT/Examples/pppkill.c
new file mode 100644 (file)
index 0000000..932eaca
--- /dev/null
+++ b/NeXT/Examples/pppkill.c
@@ -0,0 +1,90 @@
+Many thanks to:
+   shess@winternet.com (Scott Hess)  
+   andrew_abernathy@wire.seanet.com (Andrew Abernathy)
+   michal@ellpspace.math.ualberta.ca (Michal Jaegermann)
+
+for contributing programs that can take the place
+of the pppdown script.  I have included Scott Hess's 
+(now modified) here.  If you would like to see the other program, please
+mail Andrew.
+
+======================================================================
+
+From shess@winternet.com Mon Jan  9 02:45 EST 1995
+Date: Mon, 9 Jan 95 01:45 CST
+From: shess@winternet.com (Scott Hess)
+Reply-To: shess@winternet.com (Scott Hess)
+To: Steve Perkins <perkins@cps.msu.edu>
+Subject: Bringing down ppp.
+
+[munch]
+
+In any case, having to run pppdown as root has been annoying,
+because I don't like to run things as root more than necessary.
+In other words, more than about once a week is too often :-).  So,
+I wrote the following quick&dirty hack.  Basic operation is to read
+the pppd pid from a file where it's stored and send a SIGINT to
+that process.  Since there's not a shell script in sight, this
+should be a reasonably safe program to make setuid root.  [I'll
+have to think on what someone can do if they crack it or /etc/ppp
+and can send SIGINT to just anyone.  Perhaps it should check to
+see if the process is really a pppd?  Oh, well.]
+
+howard:/tmp> ls -l /usr/local/ppp/bin/killppp 
+
+-rwsr-sr-x  1 root        1464 Jan  7 12:41 /usr/local/ppp/bin/killppp*
+howard:/tmp> cat /usr/local/ppp/src/killppp.c 
+
+/*
+ * Originally written by Scott Hess <shess@winternet.com>
+ * and later modified by Michal Jaegermann  <michal@ellpspace.math.ualberta.ca>
+ */
+
+#include <libc.h>
+#include <stdio.h>
+
+
+#include <libc.h>
+#include <stdio.h>
+
+#define PIDF "/etc/ppp/ppp0.pid"
+
+int
+main( void)
+{
+    FILE *ff;
+    int pid;
+
+    
+    if( NULL == (ff = fopen( PIDF, "r"))) {
+        perror( "opening " PIDF
+       "\nppp0 link does not seem to be active" );
+        exit(1);
+    }
+    
+
+    if( fscanf( ff, "%d", &pid)<1) {
+        fprintf( stderr, "Cannot read pid from" PIDF "\n");
+        exit(1);
+    }
+    
+
+    fclose( ff);
+    if( kill( pid, SIGINT)==-1) {
+        perror( "killing pppd");
+       fprintf( stderr, "removing stale" PIDF "file\n");
+       if (0 != unlink( PIDF)) {
+           perror("cannot remove" PIDF);
+       }
+       exit(1);
+    }
+    return 0;
+}
+
+Later,
+---
+scott hess <shess@winternet.com> (WWW to "http://www.winternet.com/~shess/")
+Home:   12901 Upton Avenue South, #326  Burnsville, MN 55337  (612) 895-1208
+Office: 101 W. Burnsville Pkwy, Suite 108E, Burnsville, MN 55337    890-1332
+<?If you haven't the time to design, where will you find the time to debug?>
+