File mtr-0.87-capabilities.patch of Package mtr

diff -rau mtr-0.87/configure.ac mtr-0.87.patched/configure.ac
--- mtr-0.87/configure.ac	2016-08-03 07:26:53.000000000 +0200
+++ mtr-0.87.patched/configure.ac	2016-12-08 16:44:12.567466576 +0100
@@ -20,6 +20,10 @@
 AC_CHECK_HEADERS(ncurses.h ncurses/curses.h curses.h cursesX.h sys/types.h fcntl.h)
 AC_CHECK_HEADERS(socket.h sys/socket.h sys/xti.h arpa/nameser_compat.h)
 
+AC_CHECK_LIB(cap, cap_init,
+              AC_DEFINE(HAVE_CAPABILITIES, 1, capability support)
+              LIBS="$LIBS -lcap", AC_MSG_WARN(No capability support available.))
+
 AC_SEARCH_LIBS(initscr, [ncurses curses cursesX], ,
   AC_MSG_WARN(Building without curses display support)
   AC_DEFINE(NO_CURSES, 1, [Define if you don't have the curses libraries available.])
Only in mtr-0.87.patched: configure.ac.orig
Only in mtr-0.87.patched: configure.ac.rej
diff -rau mtr-0.87/mtr.c mtr-0.87.patched/mtr.c
--- mtr-0.87/mtr.c	2016-08-01 15:15:17.000000000 +0200
+++ mtr-0.87.patched/mtr.c	2016-12-08 16:43:33.906800557 +0100
@@ -46,6 +46,9 @@
 #include "asn.h"
 #include "version.h"
 
+#ifdef HAVE_CAPABILITIES
+#include <sys/capability.h>
+#endif
 
 #ifdef ENABLE_IPV6
 #define DEFAULT_AF AF_UNSPEC
@@ -605,6 +608,18 @@
     exit( EXIT_FAILURE );
   }
 
+   /* ported from ping */
+#ifdef HAVE_CAPABILITIES
+   {
+	cap_t caps = cap_init();
+	if (cap_set_proc(caps) < 0) {
+		fprintf (stderr, "mtr: Unable to drop capabilities.\n");
+		exit(1);
+	}
+	cap_free(caps);
+   }
+#endif
+
   /*  Now drop to user permissions  */
   if (setgid(getgid()) || setuid(getuid())) {
     fprintf (stderr, "mtr: Unable to drop permissions.\n");