rpm-build: use pkg-config to detect wireshark presence

Wireshark supports pkg-config since 1.11.3.  Right now we build
wireshark-dissectior tool as default trough rpm build only on
fedora >= 21 and there is new wireshark that supports pkg-config.
If someone wants to build libvirt with wireshark-dissector against old
wireshark, they should specify the location by hand.

This patch is mainly to fix wrong dependency on wireshark binary as it
doesn't make sense to require that binary file to just get version info
of that package in makefile.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

configure.ac

@@ -247,6 +247,7 @@ LIBVIRT_CHECK_SELINUX
 LIBVIRT_CHECK_SSH2
 LIBVIRT_CHECK_SYSTEMD_DAEMON
 LIBVIRT_CHECK_UDEV
+LIBVIRT_CHECK_WIRESHARK
 LIBVIRT_CHECK_YAJL
 
 AC_MSG_CHECKING([for CPUID instruction])
@@ -2642,70 +2643,6 @@ AM_CONDITIONAL([HAVE_LIBNL], [test "$have_libnl" = "yes"])
 AC_SUBST([LIBNL_CFLAGS])
 AC_SUBST([LIBNL_LIBS])
 
-dnl wireshark dissector
-
-AC_ARG_WITH([wireshark-dissector],
-  [AS_HELP_STRING([--with-wireshark-dissector],
-    [enable wireshark dissector plugin support @<:@default=check@:>@])],
-  [ with_wireshark_dissector=$withval ],
-  [ with_wireshark_dissector=check ])
-
-AC_DEFUN([LIBVIRT_WS_HANDLE_ERROR], [
-  if test "$with_wireshark_dissector" = "yes"; then
-    AC_MSG_ERROR([$1])
-  else
-    with_wireshark_dissector=no
-  fi
-])
-if test "$with_wireshark_dissector" != "no"; then
-    dnl Check for XDR headers existence
-    AC_CHECK_HEADERS([rpc/types.h])
-
-    dnl Check for glib-2.0 existence
-    PKG_CHECK_MODULES([GLIB], [glib-2.0], [
-      WS_DISSECTOR_CPPFLAGS="$WS_DISSECTOR_CPPFLAGS `$PKG_CONFIG --cflags glib-2.0`"
-    ], [
-      LIBVIRT_WS_HANDLE_ERROR([pkg-config 'glib-2.0' is required for wireshark-dissector support])
-    ])
-
-    dnl Search for wireshark(or tshark) command
-    AC_PATH_PROG([WIRESHARK], [wireshark])
-    AC_PATH_PROG([WIRESHARK], [tshark])
-    if test -z "$WIRESHARK"; then
-        LIBVIRT_WS_HANDLE_ERROR([command not found wireshark or tshark])
-    else
-        dnl Check for wireshark headers
-        save_CPPFLAGS="$CPPFLAGS"
-        WS_DISSECTOR_CPPFLAGS="$WS_DISSECTOR_CPPFLAGS -I`dirname $WIRESHARK`/../include/wireshark"
-        CPPFLAGS="$CPPFLAGS $WS_DISSECTOR_CPPFLAGS"
-        AC_CHECK_HEADERS([wireshark/config.h],, [
-            LIBVIRT_WS_HANDLE_ERROR([wireshark/config.h is required for wireshark-dissector support])
-        ])
-        AC_CHECK_HEADERS([wireshark/epan/packet.h wireshark/epan/dissectors/packet-tcp.h],, [
-            LIBVIRT_WS_HANDLE_ERROR([wireshark/epan/{packet,packet-tcp}.h are required for wireshark-dissector support])
-        ], [
-          #include <wireshark/config.h>
-        ])
-        CPPFLAGS="$save_CPPFLAGS"
-    fi
-    if test "$with_wireshark_dissector" != "no"; then
-        with_wireshark_dissector=yes
-    fi
-fi
-AC_SUBST([WS_DISSECTOR_CPPFLAGS])
-AM_CONDITIONAL([WITH_WIRESHARK_DISSECTOR], [test "$with_wireshark_dissector" = "yes"])
-
-AC_ARG_WITH([ws-plugindir],
-  [AS_HELP_STRING([--with-ws-plugindir],
-    [wireshark plugins directory for use when installing wireshark plugin])],
-  [ws_plugindir=$withval])
-
-if test "$with_wireshark_dissector" != "no" && test -z "$ws_plugindir"; then
-    ws_version=`$WIRESHARK -v | head -1 | cut -f 2 -d' '`
-    ws_plugindir="$libdir/wireshark/plugins/$ws_version"
-fi
-AC_SUBST([ws_plugindir])
-
 # Check for Linux vs. BSD ifreq members
 AC_CHECK_MEMBERS([struct ifreq.ifr_newname,
                   struct ifreq.ifr_ifindex,
@@ -2937,6 +2874,7 @@ LIBVIRT_RESULT_SELINUX
 LIBVIRT_RESULT_SSH2
 LIBVIRT_RESULT_SYSTEMD_DAEMON
 LIBVIRT_RESULT_UDEV
+LIBVIRT_RESULT_WIRESHARK
 LIBVIRT_RESULT_YAJL
 AC_MSG_NOTICE([  libxml: $LIBXML_CFLAGS $LIBXML_LIBS])
 AC_MSG_NOTICE([  dlopen: $DLOPEN_LIBS])

m4/virt-wireshark.m4

@@ -0,0 +1,44 @@
+dnl The libvirt.so wireshark plugin
+dnl
+dnl Copyright (C) 2015 Red Hat, Inc.
+dnl
+dnl This library is free software; you can redistribute it and/or
+dnl modify it under the terms of the GNU Lesser General Public
+dnl License as published by the Free Software Foundation; either
+dnl version 2.1 of the License, or (at your option) any later version.
+dnl
+dnl This library is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+dnl Lesser General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU Lesser General Public
+dnl License along with this library.  If not, see
+dnl <http://www.gnu.org/licenses/>.
+dnl
+
+AC_DEFUN([LIBVIRT_CHECK_WIRESHARK],[
+  LIBVIRT_CHECK_PKG([WIRESHARK_DISSECTOR], [wireshark], [1.11.3])
+
+  AC_ARG_WITH([ws-plugindir],
+    [AS_HELP_STRING([--with-ws-plugindir],
+      [wireshark plugins directory for use when installing wireshark plugin])],
+      [], [with_ws_plugindir=check])
+
+  dnl Check for system location of wireshark plugins
+  if test "x$with_wireshark_dissector" != "xno" ; then
+    if test "x$with_ws_plugindir" = "xcheck" ; then
+      ws_plugindir="$libdir/wireshark/plugins/$($PKG_CONFIG --modversion wireshark)"
+    elif test "x$with_ws_plugindir" = "xno" || test "x$with_ws_plugindir" = "xyes"; then
+      AC_MSG_ERROR([ws-plugindir must be used only with valid path])
+    else
+      ws_plugindir=$with_ws_plugindir
+    fi
+  fi
+
+  AC_SUBST([ws_plugindir])
+])
+
+AC_DEFUN([LIBVIRT_RESULT_WIRESHARK],[
+  LIBVIRT_RESULT_LIB([WIRESHARK_DISSECTOR])
+])

tools/wireshark/src/Makefile.am

@@ -26,7 +26,7 @@ INCLUDES = \
 
 ws_plugin_LTLIBRARIES     = libvirt.la
 libvirt_la_SOURCES        = packet-libvirt.h packet-libvirt.c plugin.c
-libvirt_la_CPPFLAGS       = $(WS_DISSECTOR_CPPFLAGS)
+libvirt_la_CPPFLAGS       = $(WIRESHARK_DISSECTOR_CFLAGS)
 libvirt_la_LDFLAGS        = -avoid-version -module
 
 packet-libvirt.c: packet-libvirt.h libvirt/protocol.h