diff -up smartmontools-5.38/configure.in.lowcap smartmontools-5.38/configure.in

--- smartmontools-5.38/configure.in.lowcap	2009-10-05 15:33:00.231298546 +0200

+++ smartmontools-5.38/configure.in	2009-10-05 15:33:00.237483461 +0200

@@ -143,6 +143,40 @@ if test "$with_selinux" = "yes"; then

 	AC_DEFINE(WITH_SELINUX, [1], [Define to 1 if SELinux support is enabled])

 fi

+  AC_ARG_WITH(libcap-ng,

+    [  --with-libcap-ng=[auto/yes/no]  Add Libcap-ng support [default=auto]],,

+    with_libcap_ng=auto)

+

+# Check for Libcap-ng API

+#

+# libcap-ng detection

+

+if test x$with_libcap_ng = xno ; then

+    have_libcap_ng=no;

+else

+    # Start by checking for header file

+    AC_CHECK_HEADER(cap-ng.h, capng_headers=yes, capng_headers=no)

+

+    # See if we have libcap-ng library

+    AC_CHECK_LIB(cap-ng, capng_clear, CAPNG_LDADD=-lcap-ng,)

+

+    # Check results are usable

+    if test x$with_libcap_ng = xyes -a x$CAPNG_LDADD = x ; then

+       AC_MSG_ERROR(libcap-ng support was requested and the library was not found)

+    fi

+    if test x$CAPNG_LDADD != x -a $capng_headers = no ; then

+       AC_MSG_ERROR(libcap-ng libraries found but headers are missing)

+    fi

+fi

+AC_SUBST(CAPNG_LDADD)

+AC_MSG_CHECKING(whether to use libcap-ng)

+if test x$CAPNG_LDADD != x ; then

+    AC_DEFINE(HAVE_LIBCAP_NG,1,[libcap-ng support])

+    AC_MSG_RESULT(yes)

+else

+    AC_MSG_RESULT(no)

+fi

+

 if test "$prefix" = "NONE"; then

     dnl no prefix and no mandir, so use ${prefix}/share/man as default

     if test "$mandir" = '${prefix}/man'; then

diff -up smartmontools-5.38/Makefile.am.lowcap smartmontools-5.38/Makefile.am

--- smartmontools-5.38/Makefile.am.lowcap	2007-04-01 18:49:44.000000000 +0200

+++ smartmontools-5.38/Makefile.am	2009-10-05 15:33:00.238483296 +0200

@@ -35,7 +35,7 @@ smartd_SOURCES =  smartd.cpp      \

                   utility.cpp     \

                   utility.h

-smartd_LDADD = @os_deps@ @os_libs@

+smartd_LDADD = @os_deps@ @os_libs@ @CAPNG_LDADD@

 smartd_DEPENDENCIES = @os_deps@

 EXTRA_smartd_SOURCES = os_darwin.cpp    \

diff -up smartmontools-5.38/smartd.8.in.lowcap smartmontools-5.38/smartd.8.in

--- smartmontools-5.38/smartd.8.in.lowcap	2008-03-04 23:09:47.000000000 +0100

+++ smartmontools-5.38/smartd.8.in	2009-10-05 15:44:35.455113557 +0200

@@ -354,6 +354,12 @@ The default level is 1, so \'\-r ataioct

 equivalent.

 .TP

+.B \-C, \-\-capabilities

+Use possix \fBcapabilities(7)\fP (EXPERIMENTAL).

+

+Warning: Mail notification does not work when used.

+

+.TP

 .B \-\-service

 Cygwin and Windows only: Enables \fBsmartd\fP to run as a Windows service.

diff -up smartmontools-5.38/smartd.cpp.lowcap smartmontools-5.38/smartd.cpp

--- smartmontools-5.38/smartd.cpp.lowcap	2009-10-05 15:33:00.224483349 +0200

+++ smartmontools-5.38/smartd.cpp	2009-10-05 15:33:00.245483604 +0200

@@ -74,6 +74,10 @@ extern "C" int __stdcall FreeConsole(voi

 #include <io.h> // setmode()

 #endif // __CYGWIN__

+#ifdef HAVE_LIBCAP_NG

+#include <cap-ng.h>

+#endif //LIBCAP_NG

+

 // locally included files

 #include "int64.h"

 #include "atacmds.h"

@@ -179,6 +183,11 @@ static int facility=LOG_DAEMON;

 static bool do_fork=true;

 #endif

+#ifdef HAVE_LIBCAP_NG

+// enable possix capabilities

+static bool enable_capabilities=false;

+#endif

+

 // used for control of printing, passing arguments to atacmds.c

 smartmonctrl *con=NULL;

@@ -613,6 +622,15 @@ void MailWarning(cfgfile *cfg, int which

     if  (epoch<(mail->lastsent+days))

       return;

   }

+  

+#ifdef HAVE_LIBCAP_NG

+  if (enable_capabilities) {

+    PrintOut(LOG_ERR,"Sending a mail was supressed. "

+		     "Mails can't be send when capabilites are enabled\n");

+    return;

+  }

+

+#endif

   // record the time of this mail message, and the first mail message

   if (!mail->logged)

@@ -1239,6 +1257,11 @@ void Usage (void){

   PrintOut(LOG_INFO,"        Quit on one of: %s\n\n", GetValidArgList('q'));

   PrintOut(LOG_INFO,"  -r, --report=TYPE\n");

   PrintOut(LOG_INFO,"        Report transactions for one of: %s\n\n", GetValidArgList('r'));

+#ifdef HAVE_LIBCAP_NG

+  PrintOut(LOG_INFO,"  -C, --usecapabilities\n");

+  PrintOut(LOG_INFO,"        Use possix capabilities (EXPERIMENTAL).\n"

+		    "        Warning: Mail notification does not work when used.\n");

+#endif

 #ifdef _WIN32

   PrintOut(LOG_INFO,"  --service\n");

   PrintOut(LOG_INFO,"        Running as windows service (see man page), install with:\n");

@@ -1260,6 +1283,9 @@ void Usage (void){

   PrintOut(LOG_INFO,"  -p NAME    Write PID file NAME\n");

   PrintOut(LOG_INFO,"  -q WHEN    Quit on one of: %s\n", GetValidArgList('q'));

   PrintOut(LOG_INFO,"  -r TYPE    Report transactions for one of: %s\n", GetValidArgList('r'));

+#ifdef HAVE_LIBCAP_NG

+  PrintOut(LOG_INFO,"  -C         Use possix capabilities (EXPERIMENTAL)\n");

+#endif

   PrintOut(LOG_INFO,"  -V         Print License, Copyright, and version information\n");

 #endif

 }

@@ -3890,6 +3916,7 @@ void ParseOpts(int argc, char **argv){

     { "copyright",      no_argument,       0, 'V' },

     { "help",           no_argument,       0, 'h' },

     { "usage",          no_argument,       0, 'h' },

+    { "usecapabilities",no_argument,       0, 'C' },

     { 0,                0,                 0, 0   }

   };

 #endif

@@ -4030,6 +4057,12 @@ void ParseOpts(int argc, char **argv){

       PrintCopyleft();

       EXIT(0);

       break;

+#ifdef HAVE_LIBCAP_NG

+    case 'C':

+      //enable possix capabilities

+      enable_capabilities=1;

+      break;

+#endif

     case 'h':

       // help: print summary of command-line options

       debugmode=1;

@@ -4408,6 +4441,16 @@ static int smartd_main(int argc, char **

   // don't exit on bad checksums

   con->checksumfail=0;

+

+#ifdef HAVE_LIBCAP_NG

+  // Drop capabilities

+  if (enable_capabilities) {

+    capng_clear(CAPNG_SELECT_BOTH);

+    capng_updatev(CAPNG_ADD, (capng_type_t)(CAPNG_EFFECTIVE|CAPNG_PERMITTED),

+                CAP_SYS_ADMIN, CAP_MKNOD, CAP_SYS_RAWIO, -1);

+    capng_apply(CAPNG_SELECT_BOTH);

+  }

+#endif

   // the main loop of the code

   while (1){

@@ -4482,7 +4525,15 @@ static int smartd_main(int argc, char **

         PrintTestSchedule(ATAandSCSIdevlist);

         EXIT(0);

       }

-      

+#ifdef HAVE_LIBCAP_NG

+      for(int i=numdevata+numdevscsi; i>1; i--) {

+	  if (ATAandSCSIdevlist[i-1]->mailwarn) {

+	      PrintOut(LOG_WARNING,"Mail can't be enabled together with --usecapabilities. All mail will be suppressed.\n");

+	      break;

+	  }

+      }

+	

+#endif

       // reset signal

       caughtsigHUP=0;

     }