X-Git-Url: https://git.octo.it/?p=collectd.git;a=blobdiff_plain;f=configure.in;h=88cdb50f17d3549cd48092523dd833a5c22e0c21;hp=a11e3ba73af3b6ce42836a904305ee7afc06732a;hb=5ec7a37c81d6f64f35b1f35e2f0e3157e83f2718;hpb=71cc6701e311071e1d9bfebbe53f9ac324cc7dfb

diff --git a/configure.in b/configure.in
index a11e3ba7..88cdb50f 100644
--- a/configure.in
+++ b/configure.in
@@ -47,6 +47,9 @@ AC_PROG_LEX
 AC_PROG_YACC
 PKG_PROG_PKG_CONFIG
 
+AC_CHECK_PROG([have_protoc_c], [protoc-c], [yes], [no])
+AM_CONDITIONAL(HAVE_PROTOC_C, test "x$have_protoc_c" = "xyes")
+
 AC_MSG_CHECKING([for kernel type ($host_os)])
 case $host_os in
 	*linux*)
@@ -88,6 +91,10 @@ if test "x$ac_system" = "xSolaris"
 then
 	AC_DEFINE(_POSIX_PTHREAD_SEMANTICS, 1, [Define to enforce POSIX thread semantics under Solaris.])
 fi
+if test "x$ac_system" = "xAIX"
+then
+	AC_DEFINE(_THREAD_SAFE_ERRNO, 1, [Define to use the thread-safe version of errno under AIX.])
+fi
 
 # Where to install .pc files.
 pkgconfigdir="${libdir}/pkgconfig"
@@ -115,7 +122,7 @@ AC_HEADER_SYS_WAIT
 AC_HEADER_DIRENT
 AC_HEADER_STDBOOL
 
-AC_CHECK_HEADERS(stdio.h stdint.h errno.h math.h stdarg.h syslog.h fcntl.h signal.h assert.h sys/types.h sys/socket.h sys/select.h poll.h netdb.h arpa/inet.h sys/resource.h sys/param.h kstat.h regex.h sys/ioctl.h endian.h sys/isa_defs.h)
+AC_CHECK_HEADERS(stdio.h errno.h math.h stdarg.h syslog.h fcntl.h signal.h assert.h sys/types.h sys/socket.h sys/select.h poll.h netdb.h arpa/inet.h sys/resource.h sys/param.h kstat.h regex.h sys/ioctl.h endian.h sys/isa_defs.h)
 
 # For ping library
 AC_CHECK_HEADERS(netinet/in_systm.h, [], [],
@@ -477,10 +484,17 @@ AC_HEADER_TIME
 # Checks for library functions.
 #
 AC_PROG_GCC_TRADITIONAL
-AC_CHECK_FUNCS(gettimeofday select strdup strtol getaddrinfo getnameinfo strchr memcpy strstr strcmp strncmp strncpy strlen strncasecmp strcasecmp openlog closelog sysconf)
+AC_CHECK_FUNCS(gettimeofday select strdup strtol getaddrinfo getnameinfo strchr memcpy strstr strcmp strncmp strncpy strlen strncasecmp strcasecmp openlog closelog sysconf setenv if_indextoname)
 
 AC_FUNC_STRERROR_R
 
+SAVE_CFLAGS="$CFLAGS"
+# Emulate behavior of src/Makefile.am
+if test "x$GCC" = "xyes"
+then
+	CFLAGS="$CFLAGS -Wall -Werror"
+fi
+
 AC_CACHE_CHECK([for strtok_r],
   [c_cv_have_strtok_r_default],
   AC_LINK_IFELSE(
@@ -511,7 +525,6 @@ AC_CACHE_CHECK([for strtok_r],
 
 if test "x$c_cv_have_strtok_r_default" = "xno"
 then
-  SAVE_CFLAGS="$CFLAGS"
   CFLAGS="$CFLAGS -D_REENTRANT=1"
 
   AC_CACHE_CHECK([if strtok_r needs _REENTRANT],
@@ -543,6 +556,12 @@ then
   )
 fi
 
+CFLAGS="$SAVE_CFLAGS"
+if test "x$c_cv_have_strtok_r_reentrant" = "xyes"
+then
+	CFLAGS="$CFLAGS -D_REENTRANT=1"
+fi
+
 AC_CHECK_FUNCS(getpwnam_r getgrnam_r setgroups regcomp regerror regexec regfree)
 
 socket_needs_socket="no"
@@ -550,8 +569,16 @@ AC_CHECK_FUNCS(socket, [], AC_CHECK_LIB(socket, socket, [socket_needs_socket="ye
 AM_CONDITIONAL(BUILD_WITH_LIBSOCKET, test "x$socket_needs_socket" = "xyes")
 
 nanosleep_needs_rt="no"
-AC_CHECK_FUNCS(nanosleep, [], AC_CHECK_LIB(rt, nanosleep, [nanosleep_needs_rt="yes"], AC_MSG_ERROR(cannot find nanosleep)))
+nanosleep_needs_posix4="no"
+AC_CHECK_FUNCS(nanosleep,
+    [],
+    AC_CHECK_LIB(rt, nanosleep,
+        [nanosleep_needs_rt="yes"],
+        AC_CHECK_LIB(posix4, nanosleep,
+            [nanosleep_needs_posix4="yes"],
+            AC_MSG_ERROR(cannot find nanosleep))))
 AM_CONDITIONAL(BUILD_WITH_LIBRT, test "x$nanosleep_needs_rt" = "xyes")
+AM_CONDITIONAL(BUILD_WITH_LIBPOSIX4, test "x$nanosleep_needs_posix4" = "xyes")
 
 AC_CHECK_FUNCS(sysctl, [have_sysctl="yes"], [have_sysctl="no"])
 AC_CHECK_FUNCS(sysctlbyname, [have_sysctlbyname="yes"], [have_sysctlbyname="no"])
@@ -707,6 +734,9 @@ if test "x$fp_layout_type" = "xunknown"; then
 #if HAVE_STDINT_H
 # include <stdint.h>
 #endif
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
 #if HAVE_STDBOOL_H
 # include <stdbool.h>
 #endif
@@ -751,6 +781,9 @@ if test "x$fp_layout_type" = "xunknown"; then
 #if HAVE_STDINT_H
 # include <stdint.h>
 #endif
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
 #if HAVE_STDBOOL_H
 # include <stdbool.h>
 #endif
@@ -803,6 +836,9 @@ if test "x$fp_layout_type" = "xunknown"; then
 #if HAVE_STDINT_H
 # include <stdint.h>
 #endif
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
 #if HAVE_STDBOOL_H
 # include <stdbool.h>
 #endif
@@ -931,6 +967,27 @@ if test "x$have_getmntent" = "xgen"; then
 		  [Define if the function getmntent exists. It's the version from libgen.])
 fi
 
+# Check for htonll
+AC_MSG_CHECKING([if have htonll defined])
+
+    have_htonll="no"
+    AC_LINK_IFELSE([
+       AC_LANG_PROGRAM([
+#include <sys/types.h>
+#include <netinet/in.h>
+#if HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
+       ], [
+          return htonll(0);
+       ])
+    ], [
+      have_htonll="yes"
+      AC_DEFINE(HAVE_HTONLL, 1, [Define if the function htonll exists.])
+    ])
+ 
+AC_MSG_RESULT([$have_htonll])
+
 # Check for structures
 AC_CHECK_MEMBERS([struct if_data.ifi_ibytes, struct if_data.ifi_opackets, struct if_data.ifi_ierrors],
 	[AC_DEFINE(HAVE_STRUCT_IF_DATA, 1, [Define if struct if_data exists and is usable.])],
@@ -950,6 +1007,13 @@ AC_CHECK_MEMBERS([struct net_device_stats.rx_bytes, struct net_device_stats.tx_p
 	#include <linux/netdevice.h>
 	])
 
+AC_CHECK_MEMBERS([struct ip_mreqn.imr_ifindex], [],
+	[],
+	[
+	#include <netinet/in.h>
+	#include <net/if.h>
+	])
+
 AC_CHECK_MEMBERS([struct kinfo_proc.ki_pid, struct kinfo_proc.ki_rssize, struct kinfo_proc.ki_rusage],
 	[
 		AC_DEFINE(HAVE_STRUCT_KINFO_PROC_FREEBSD, 1,
@@ -1611,6 +1675,7 @@ with_java_vmtype="client"
 with_java_cflags=""
 with_java_libs=""
 JAVAC="$JAVAC"
+JAR="$JAR"
 AC_ARG_WITH(java, [AS_HELP_STRING([--with-java@<:@=PREFIX@:>@], [Path to Java home.])],
 [
 	if test "x$withval" = "xno"
@@ -1671,6 +1736,18 @@ then
 				AC_MSG_RESULT([not found])
 			fi
 		fi
+		if test "x$JAR" = "x"
+		then
+			AC_MSG_CHECKING([for jar])
+			TMPDIR=`find "$with_java_home" -name jar -type f | head -n 1`
+			if test "x$TMPDIR" != "x"
+			then
+				JAR="$TMPDIR"
+				AC_MSG_RESULT([$JAR])
+			else
+				AC_MSG_RESULT([not found])
+			fi
+		fi
 	else if test "x$with_java_home" != "x"
 	then
 		AC_MSG_WARN([JAVA_HOME: No such directory: $with_java_home])
@@ -1707,6 +1784,24 @@ if test "x$JAVAC" = "x"
 then
 	with_java="no (javac not found)"
 fi
+if test "x$JAR" = "x"
+then
+	with_jar_path="$PATH"
+	if test "x$with_java_home" != "x"
+	then
+		with_jar_path="$with_java_home:$with_jar_path"
+		if test -d "$with_java_home/bin"
+		then
+			with_jar_path="$with_java_home/bin:$with_jar_path"
+		fi
+	fi
+
+	AC_PATH_PROG(JAR, jar, [], "$with_jar_path")
+fi
+if test "x$JAR" = "x"
+then
+	with_java="no (jar not found)"
+fi
 
 SAVE_CPPFLAGS="$CPPFLAGS"
 SAVE_CFLAGS="$CFLAGS"
@@ -1794,6 +1889,98 @@ fi
 AM_CONDITIONAL(BUILD_WITH_LIBMEMCACHED, test "x$with_libmemcached" = "xyes")
 # }}}
 
+# --with-libmodbus {{{
+with_libmodbus_config=""
+with_libmodbus_cflags=""
+with_libmodbus_libs=""
+AC_ARG_WITH(libmodbus, [AS_HELP_STRING([--with-libmodbus@<:@=PREFIX@:>@], [Path to the modbus library.])],
+[
+	if test "x$withval" = "xno"
+	then
+		with_libmodbus="no"
+	else if test "x$withval" = "xyes"
+	then
+		with_libmodbus="use_pkgconfig"
+	else if test -d "$with_libmodbus/lib"
+	then
+		AC_MSG_NOTICE([Not checking for libmodbus: Manually configured])
+		with_libmodbus_cflags="-I$withval/include"
+		with_libmodbus_libs="-L$withval/lib -lmodbus"
+		with_libmodbus="yes"
+	fi; fi; fi
+],
+[with_libmodbus="use_pkgconfig"])
+
+# configure using pkg-config
+if test "x$with_libmodbus" = "xuse_pkgconfig"
+then
+	if test "x$PKG_CONFIG" = "x"
+	then
+		with_libmodbus="no (Don't have pkg-config)"
+	fi
+fi
+if test "x$with_libmodbus" = "xuse_pkgconfig"
+then
+	AC_MSG_NOTICE([Checking for modbus using $PKG_CONFIG])
+	$PKG_CONFIG --exists 'modbus' 2>/dev/null
+	if test $? -ne 0
+	then
+		with_libmodbus="no (pkg-config doesn't know library)"
+	fi
+fi
+if test "x$with_libmodbus" = "xuse_pkgconfig"
+then
+	with_libmodbus_cflags="`$PKG_CONFIG --cflags 'modbus'`"
+	if test $? -ne 0
+	then
+		with_libmodbus="no ($PKG_CONFIG failed)"
+	fi
+	with_libmodbus_libs="`$PKG_CONFIG --libs 'modbus'`"
+	if test $? -ne 0
+	then
+		with_libmodbus="no ($PKG_CONFIG failed)"
+	fi
+fi
+if test "x$with_libmodbus" = "xuse_pkgconfig"
+then
+	with_libmodbus="yes"
+fi
+
+# with_libmodbus_cflags and with_libmodbus_libs are set up now, let's do
+# the actual checks.
+if test "x$with_libmodbus" = "xyes"
+then
+	SAVE_CPPFLAGS="$CPPFLAGS"
+	CPPFLAGS="$CPPFLAGS $with_libmodbus_cflags"
+
+	AC_CHECK_HEADERS(modbus/modbus.h, [], [with_libmodbus="no (modbus/modbus.h not found)"])
+
+	CPPFLAGS="$SAVE_CPPFLAGS"
+fi
+if test "x$with_libmodbus" = "xyes"
+then
+	SAVE_CPPFLAGS="$CPPFLAGS"
+	SAVE_LDFLAGS="$LDFLAGS"
+
+	CPPFLAGS="$CPPFLAGS $with_libmodbus_cflags"
+	LDFLAGS="$LDFLAGS $with_libmodbus_libs"
+
+	AC_CHECK_LIB(modbus, modbus_init_tcp,
+		     [with_libmodbus="yes"],
+		     [with_libmodbus="no (symbol modbus_init_tcp not found)"])
+
+	CPPFLAGS="$SAVE_CPPFLAGS"
+	LDFLAGS="$SAVE_LDFLAGS"
+fi
+if test "x$with_libmodbus" = "xyes"
+then
+	BUILD_WITH_LIBMODBUS_CFLAGS="$with_libmodbus_cflags"
+	BUILD_WITH_LIBMODBUS_LIBS="$with_libmodbus_libs"
+	AC_SUBST(BUILD_WITH_LIBMODBUS_CFLAGS)
+	AC_SUBST(BUILD_WITH_LIBMODBUS_LIBS)
+fi
+# }}}
+
 # --with-libmysql {{{
 with_mysql_config="mysql_config"
 with_mysql_cflags=""
@@ -2369,19 +2556,13 @@ then
 fi
 if test "x$with_libpcap" = "xyes"
 then
-	AC_CHECK_HEADERS(pcap.h,
-	[
-		AC_DEFINE(HAVE_PCAP_H, 1, [Define to 1 if you have the <pcap.h> header file.])
-	], [with_libpcap="no (pcap.h not found)"])
+	AC_CHECK_HEADERS(pcap.h,,
+			 [with_libpcap="no (pcap.h not found)"])
 fi
 if test "x$with_libpcap" = "xyes"
 then
-	collect_libpcap=1
-else
-	collect_libpcap=0
+	AC_CHECK_HEADERS(pcap-bpf.h)
 fi
-AC_DEFINE_UNQUOTED(COLLECT_LIBPCAP, [$collect_libpcap],
-	[Wether or not to use the pcap library])
 AM_CONDITIONAL(BUILD_WITH_LIBPCAP, test "x$with_libpcap" = "xyes")
 # }}}
 
@@ -2739,7 +2920,7 @@ fi
 if test "x$with_python" = "xyes"
 then
 	AC_MSG_CHECKING([for Python CPPFLAGS])
-	python_include_path=`echo "import distutils.sysconfig;print distutils.sysconfig.get_python_inc()" | "$with_python_prog" 2>&1`
+	python_include_path=`echo "import distutils.sysconfig;import sys;sys.stdout.write(distutils.sysconfig.get_python_inc())" | "$with_python_prog" 2>&1`
 	python_config_status=$?
 
 	if test "$python_config_status" -ne 0 || test "x$python_include_path" = "x"
@@ -2762,7 +2943,7 @@ fi
 if test "x$with_python" = "xyes"
 then
 	AC_MSG_CHECKING([for Python LDFLAGS])
-	python_library_path=`echo "import distutils.sysconfig;print distutils.sysconfig.get_config_vars(\"LIBDIR\").__getitem__(0)" | "$with_python_prog" 2>&1`
+	python_library_path=`echo "import distutils.sysconfig;import sys;sys.stdout.write(distutils.sysconfig.get_config_vars(\"LIBDIR\").__getitem__(0))" | "$with_python_prog" 2>&1`
 	python_config_status=$?
 
 	if test "$python_config_status" -ne 0 || test "x$python_library_path" = "x"
@@ -2777,7 +2958,7 @@ fi
 if test "x$with_python" = "xyes"
 then
 	AC_MSG_CHECKING([for Python LIBS])
-	python_library_flags=`echo "import distutils.sysconfig;print distutils.sysconfig.get_config_vars(\"BLDLIBRARY\").__getitem__(0)" | "$with_python_prog" 2>&1`
+	python_library_flags=`echo "import distutils.sysconfig;import sys;sys.stdout.write(distutils.sysconfig.get_config_vars(\"BLDLIBRARY\").__getitem__(0))" | "$with_python_prog" 2>&1`
 	python_config_status=$?
 
 	if test "$python_config_status" -ne 0 || test "x$python_library_flags" = "x"
@@ -3204,7 +3385,7 @@ AM_CONDITIONAL(BUILD_WITH_LIBTOKYOTYRANT, test "x$with_libtokyotyrant" = "xyes")
 with_libupsclient_config=""
 with_libupsclient_cflags=""
 with_libupsclient_libs=""
-AC_ARG_WITH(libupsclient, [AS_HELP_STRING([--with-libupsclient@<:@=PREFIX@:>@], [Path to the Net-SNMPD library.])],
+AC_ARG_WITH(libupsclient, [AS_HELP_STRING([--with-libupsclient@<:@=PREFIX@:>@], [Path to the upsclient library.])],
 [
 	if test "x$withval" = "xno"
 	then
@@ -3219,7 +3400,7 @@ AC_ARG_WITH(libupsclient, [AS_HELP_STRING([--with-libupsclient@<:@=PREFIX@:>@],
 			with_libupsclient="use_libupsclient_config"
 		else if test -x "$withval/bin/libupsclient-config"
 		then
-			with_libupsclient_config="$withval/bin/net-snmp-config"
+			with_libupsclient_config="$withval/bin/libupsclient-config"
 			with_libupsclient="use_libupsclient_config"
 		else
 			AC_MSG_NOTICE([Not checking for libupsclient: Manually configured])
@@ -3426,6 +3607,7 @@ then
 	CPPFLAGS="$CPPFLAGS $with_libyajl_cppflags"
 
 	AC_CHECK_HEADERS(yajl/yajl_parse.h, [with_libyajl="yes"], [with_libyajl="no (yajl/yajl_parse.h not found)"])
+	AC_CHECK_HEADERS(yajl/yajl_version.h)
 
 	CPPFLAGS="$SAVE_CPPFLAGS"
 fi
@@ -3737,7 +3919,7 @@ AC_DEFUN(
 	     enable_plugin="yes"
 	     force="yes"
      else
-	     enable_plugin="no"
+	     enable_plugin="no (disabled on command line)"
      fi; fi
     ],
     [
@@ -3790,6 +3972,7 @@ plugin_contextswitch="no"
 plugin_cpu="no"
 plugin_cpufreq="no"
 plugin_curl_json="no"
+plugin_curl_xml="no"
 plugin_df="no"
 plugin_disk="no"
 plugin_entropy="no"
@@ -3846,7 +4029,7 @@ then
 	plugin_vserver="yes"
 	plugin_wireless="yes"
 
-	if test "x$have_net_ip_vs_h" = "xyes" -o "x$have_ip_vs_h" = "xyes"
+	if test "x$have_net_ip_vs_h" = "xyes" || test "x$have_ip_vs_h" = "xyes"
 	then
 		plugin_ipvs="yes"
 	fi
@@ -3929,6 +4112,11 @@ then
 	plugin_curl_json="yes"
 fi
 
+if test "x$with_libcurl" = "xyes" && test "x$with_libxml2" = "xyes"
+then
+	plugin_curl_xml="yes"
+fi
+
 if test "x$have_processor_info" = "xyes"
 then
 	plugin_cpu="yes"
@@ -4082,6 +4270,7 @@ AC_PLUGIN([cpu],         [$plugin_cpu],        [CPU usage statistics])
 AC_PLUGIN([csv],         [yes],                [CSV output plugin])
 AC_PLUGIN([curl],        [$with_libcurl],      [CURL generic web statistics])
 AC_PLUGIN([curl_json],   [$plugin_curl_json],    [CouchDB statistics])
+AC_PLUGIN([curl_xml],   [$plugin_curl_xml],    [CURL generic xml statistics])
 AC_PLUGIN([dbi],         [$with_libdbi],       [General database statistics])
 AC_PLUGIN([df],          [$plugin_df],         [Filesystem usage statistics])
 AC_PLUGIN([disk],        [$plugin_disk],       [Disk usage statistics])
@@ -4112,6 +4301,7 @@ AC_PLUGIN([mbmon],       [yes],                [Query mbmond])
 AC_PLUGIN([memcachec],   [$with_libmemcached], [memcachec statistics])
 AC_PLUGIN([memcached],   [yes],                [memcached statistics])
 AC_PLUGIN([memory],      [$plugin_memory],     [Memory usage])
+AC_PLUGIN([modbus],      [$with_libmodbus],    [Modbus plugin])
 AC_PLUGIN([multimeter],  [$plugin_multimeter], [Read multimeter values])
 AC_PLUGIN([mysql],       [$with_libmysql],     [MySQL statistics])
 AC_PLUGIN([netapp],      [$with_libnetapp],    [NetApp plugin])
@@ -4128,6 +4318,8 @@ AC_PLUGIN([onewire],     [$with_libowcapi],    [OneWire sensor statistics])
 AC_PLUGIN([openvpn],     [yes],                [OpenVPN client statistics])
 AC_PLUGIN([oracle],      [$with_oracle],       [Oracle plugin])
 AC_PLUGIN([perl],        [$plugin_perl],       [Embed a Perl interpreter])
+# FIXME: Check for libevent, too.
+AC_PLUGIN([pinba],       [$have_protoc_c],     [Pinba statistics])
 AC_PLUGIN([ping],        [$with_liboping],     [Network latency statistics])
 AC_PLUGIN([postgresql],  [$with_libpq],        [PostgreSQL database statistics])
 AC_PLUGIN([powerdns],    [yes],                [PowerDNS statistics])
@@ -4307,7 +4499,7 @@ then
 	with_librrd="yes (warning: librrd is not thread-safe)"
 fi
 
-if test "x$with_libiptc" = "xyes" -a "x$with_own_libiptc" = "xyes"
+if test "x$with_libiptc" = "xyes" && test "x$with_own_libiptc" = "xyes"
 then
 	with_libiptc="yes (shipped version)"
 fi
@@ -4345,6 +4537,7 @@ Configuration:
     libkstat  . . . . . . $with_kstat
     libkvm  . . . . . . . $with_libkvm
     libmemcached  . . . . $with_libmemcached
+    libmodbus . . . . . . $with_libmodbus
     libmysql  . . . . . . $with_libmysql
     libnetapp . . . . . . $with_libnetapp
     libnetlink  . . . . . $with_libnetlink
@@ -4368,6 +4561,8 @@ Configuration:
     libxml2 . . . . . . . $with_libxml2
     libxmms . . . . . . . $with_libxmms
     libyajl . . . . . . . $with_libyajl
+    libevent  . . . . . . $with_libevent
+    protobuf-c  . . . . . $have_protoc_c
     oracle  . . . . . . . $with_oracle
     python  . . . . . . . $with_python
 
@@ -4392,6 +4587,7 @@ Configuration:
     csv . . . . . . . . . $enable_csv
     curl  . . . . . . . . $enable_curl
     curl_json . . . . . . $enable_curl_json
+    curl_xml  . . . . . . $enable_curl_xml
     dbi . . . . . . . . . $enable_dbi
     df  . . . . . . . . . $enable_df
     disk  . . . . . . . . $enable_disk
@@ -4422,6 +4618,7 @@ Configuration:
     memcachec . . . . . . $enable_memcachec
     memcached . . . . . . $enable_memcached
     memory  . . . . . . . $enable_memory
+    modbus  . . . . . . . $enable_modbus
     multimeter  . . . . . $enable_multimeter
     mysql . . . . . . . . $enable_mysql
     netapp  . . . . . . . $enable_netapp
@@ -4438,6 +4635,7 @@ Configuration:
     openvpn . . . . . . . $enable_openvpn
     oracle  . . . . . . . $enable_oracle
     perl  . . . . . . . . $enable_perl
+    pinba . . . . . . . . $enable_pinba
     ping  . . . . . . . . $enable_ping
     postgresql  . . . . . $enable_postgresql
     powerdns  . . . . . . $enable_powerdns