Autoconf: Add GSSAPI autoconf rules

Add rules to autodetect the location of a system's GSSAPI libraries,
using the gssapi.m4 script from rra-c-util 2.6

Change-Id: Idabb8fdb138a2dac6983aa4d5fd8a2f558ee08be
Reviewed-on: http://gerrit.openafs.org/3943
Tested-by: Christof Hanke <christof.hanke@rzg.mpg.de>
Reviewed-by: Derrick Brashear <shadow@dementia.org>

diff --git a/configure.ac b/configure.ac
index 5c1cd35..08e80cc 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -82,6 +82,9 @@ AS_IF([test x"$KRB5_LIBS" != x],
 AC_SUBST([BUILD_KRB5])
 AC_SUBST([MAKE_KRB5])
 
+dnl Probe for GSSAPI
+RRA_LIB_GSSAPI
+
 if test -d 'doc/man-pages' ; then
     MAN_MAKEFILE="doc/man-pages/Makefile doc/man-pages/install-man"
 else

diff --git a/src/cf/gssapi.m4 b/src/cf/gssapi.m4
new file mode 100644 (file)
index 0000000..0a657ff
--- /dev/null
+++ b/src/cf/gssapi.m4
@@ -0,0 +1,171 @@
+dnl Find the compiler and linker flags for GSS-API.
+dnl
+dnl Finds the compiler and linker flags for linking with GSS-API libraries.
+dnl Provides the --with-gssapi, --with-gssapi-include, and --with-gssapi-lib
+dnl configure option to specify a non-standard path to the GSS-API libraries.
+dnl Uses krb5-config where available unless reduced dependencies is requested.
+dnl
+dnl Provides the macro RRA_LIB_GSSAPI and sets the substitution variables
+dnl GSSAPI_CPPFLAGS, GSSAPI_LDFLAGS, and GSSAPI_LIBS.  Also provides
+dnl RRA_LIB_GSSAPI_SWITCH to set CPPFLAGS, LDFLAGS, and LIBS to include the
+dnl GSS-API libraries, saving the ecurrent values, and RRA_LIB_GSSAPI_RESTORE
+dnl to restore those settings to before the last RRA_LIB_GSSAPI_SWITCH.
+dnl
+dnl Depends on RRA_ENABLE_REDUCED_DEPENDS and RRA_SET_LDFLAGS.
+dnl
+dnl Written by Russ Allbery <rra@stanford.edu>
+dnl Copyright 2005, 2006, 2007, 2008, 2009
+dnl     Board of Trustees, Leland Stanford Jr. University
+dnl
+dnl See LICENSE for licensing terms.
+
+dnl Save the current CPPFLAGS, LDFLAGS, and LIBS settings and switch to
+dnl versions that include the GSS-API flags.  Used as a wrapper, with
+dnl RRA_LIB_GSSAPI_RESTORE, around tests.
+AC_DEFUN([RRA_LIB_GSSAPI_SWITCH],
+[rra_gssapi_save_CPPFLAGS="$CPPFLAGS"
+ rra_gssapi_save_LDFLAGS="$LDFLAGS"
+ rra_gssapi_save_LIBS="$LIBS"
+ CPPFLAGS="$GSSAPI_CPPFLAGS $CPPFLAGS"
+ LDFLAGS="$GSSAPI_LDFLAGS $LDFLAGS"
+ LIBS="$GSSAPI_LIBS $LIBS"])
+
+dnl Restore CPPFLAGS, LDFLAGS, and LIBS to their previous values (before
+dnl RRA_LIB_GSSAPI_SWITCH was called).
+AC_DEFUN([RRA_LIB_GSSAPI_RESTORE],
+[CPPFLAGS="$rra_gssapi_save_CPPFLAGS"
+ LDFLAGS="$rra_gssapi_save_LDFLAGS"
+ LIBS="$rra_gssapi_save_LIBS"])
+
+dnl Set GSSAPI_CPPFLAGS and GSSAPI_LDFLAGS based on rra_gssapi_root,
+dnl rra_gssapi_libdir, and rra_gssapi_includedir.
+AC_DEFUN([_RRA_LIB_GSSAPI_PATHS],
+[AS_IF([test x"$rra_gssapi_libdir" != x],
+    [GSSAPI_LDFLAGS="-L$rra_gssapi_libdir"],
+    [AS_IF([test x"$rra_gssapi_root" != x],
+        [RRA_SET_LDFLAGS([GSSAPI_LDFLAGS], [$rra_gssapi_root])])])
+ AS_IF([test x"$rra_gssapi_includedir" != x],
+    [GSSAPI_CPPFLAGS="-I$rra_gssapi_includedir"],
+    [AS_IF([test x"$rra_gssapi_root" != x],
+        [AS_IF([test x"$rra_gssapi_root" != x/usr],
+            [GSSAPI_CPPFLAGS="-I${rra_gssapi_root}/include"])])])])
+
+dnl Does the appropriate library checks for reduced-dependency GSS-API
+dnl linkage.
+AC_DEFUN([_RRA_LIB_GSSAPI_REDUCED],
+[RRA_LIB_GSSAPI_SWITCH
+ AC_CHECK_LIB([gssapi_krb5], [gss_import_name], [GSSAPI_LIBS="-lgssapi_krb5"],
+     [AC_CHECK_LIB([gssapi], [gss_import_name], [GSSAPI_LIBS="-lgssapi"],
+         [AC_CHECK_LIB([gss], [gss_import_name], [GSSAPI_LIBS="-lgss"],
+             [AC_MSG_ERROR([cannot find usable GSS-API library])])])])
+ RRA_LIB_GSSAPI_RESTORE])
+
+dnl Does the appropriate library checks for GSS-API linkage when we don't
+dnl have krb5-config or reduced dependencies.  libgss is used as a last
+dnl resort, since it may be a non-functional mech-independent wrapper, but
+dnl it's the right choice on Solaris 10.
+AC_DEFUN([_RRA_LIB_GSSAPI_MANUAL],
+[RRA_LIB_GSSAPI_SWITCH
+ rra_gssapi_extra=
+ LIBS=
+ AC_SEARCH_LIBS([res_search], [resolv], ,
+    [AC_SEARCH_LIBS([__res_search], [resolv])])
+ AC_SEARCH_LIBS([gethostbyname], [nsl])
+ AC_SEARCH_LIBS([socket], [socket], ,
+    [AC_CHECK_LIB([nsl], [socket], [LIBS="-lnsl -lsocket $LIBS"], ,
+        [-lsocket])])
+ AC_SEARCH_LIBS([crypt], [crypt])
+ rra_gssapi_extra="$LIBS"
+ LIBS="$rra_gssapi_save_LIBS"
+ AC_CHECK_LIB([gssapi], [gss_import_name],
+    [GSSAPI_LIBS="-lgssapi -lkrb5 -lasn1 -lroken -lcrypto -lcom_err"
+     GSSAPI_LIBS="$GSSAPI_LIBS $rra_gssapi_extra"],
+    [AC_CHECK_LIB([krb5support], [krb5int_getspecific],
+        [rra_gssapi_extra="-lkrb5support $rra_gssapi_extra"],
+        [AC_CHECK_LIB([pthreads], [pthread_setspecific],
+            [rra_gssapi_pthread="-lpthreads"],
+            [AC_CHECK_LIB([pthread], [pthread_setspecific],
+                [rra_gssapi_pthread="-lpthread"])])
+         AC_CHECK_LIB([krb5support], [krb5int_setspecific],
+            [rra_gssapi_extra="-lkrb5support $rra_gssapi_extra"
+             rra_gssapi_extra="$rra_gssapi_extra $rra_gssapi_pthread"], ,
+            [$rra_gssapi_pthread])])
+     AC_CHECK_LIB([com_err], [error_message],
+        [rra_gssapi_extra="-lcom_err $rra_gssapi_extra"])
+     AC_CHECK_LIB([k5crypto], [krb5int_hash_md5],
+        [rra_gssapi_extra="-lk5crypto $rra_gssapi_extra"])
+     rra_gssapi_extra="-lkrb5 $rra_gssapi_extra"
+     AC_CHECK_LIB([gssapi_krb5], [gss_import_name],
+        [GSSAPI_LIBS="-lgssapi_krb5 $rra_gssapi_extra"],
+        [AC_CHECK_LIB([gss], [gss_import_name],
+            [GSSAPI_LIBS="-lgss"],
+            [AC_MSG_ERROR([cannot find usable GSS-API library])])],
+        [$rra_gssapi_extra])],
+    [-lkrb5 -lasn1 -lroken -lcrypto -lcom_err $rra_gssapi_extra])
+ RRA_LIB_GSSAPI_RESTORE])
+
+dnl Sanity-check the results of krb5-config and be sure we can really link a
+dnl GSS-API program.  If not, fall back on the manual check.
+AC_DEFUN([_RRA_LIB_GSSAPI_CHECK],
+[RRA_LIB_GSSAPI_SWITCH
+ AC_CHECK_FUNC([gss_import_name],
+    [RRA_LIB_GSSAPI_RESTORE],
+    [RRA_LIB_GSSAPI_RESTORE
+     GSSAPI_CPPFLAGS=
+     GSSAPI_LIBS=
+     _RRA_LIB_GSSAPI_PATHS
+     _RRA_LIB_GSSAPI_MANUAL])])
+
+dnl The main macro.
+AC_DEFUN([RRA_LIB_GSSAPI],
+[AC_REQUIRE([RRA_ENABLE_REDUCED_DEPENDS])
+ rra_gssapi_root=
+ rra_gssapi_libdir=
+ rra_gssapi_includedir=
+ GSSAPI_CPPFLAGS=
+ GSSAPI_LDFLAGS=
+ GSSAPI_LIBS=
+ AC_SUBST([GSSAPI_CPPFLAGS])
+ AC_SUBST([GSSAPI_LDFLAGS])
+ AC_SUBST([GSSAPI_LIBS])
+
+ AC_ARG_WITH([gssapi],
+    [AS_HELP_STRING([--with-gssapi=DIR],
+        [Location of GSS-API headers and libraries])],
+    [AS_IF([test x"$withval" != xyes && test x"$withval" != xno],
+        [rra_gssapi_root="$withval"])])
+ AC_ARG_WITH([gssapi-include],
+    [AS_HELP_STRING([--with-gssapi-include=DIR],
+        [Location of GSS-API headers])],
+    [AS_IF([test x"$withval" != xyes && test x"$withval" != xno],
+        [rra_gssapi_includedir="$withval"])])
+ AC_ARG_WITH([gssapi-lib],
+    [AS_HELP_STRING([--with-gssapi-lib=DIR],
+        [Location of GSS-API libraries])],
+    [AS_IF([test x"$withval" != xyes && test x"$withval" != xno],
+        [rra_gssapi_libdir="$withval"])])
+
+ AS_IF([test x"$rra_reduced_depends" = xtrue],
+    [_RRA_LIB_GSSAPI_PATHS
+     _RRA_LIB_GSSAPI_REDUCED],
+    [AC_ARG_VAR([KRB5_CONFIG], [Path to krb5-config])
+     AS_IF([test x"$rra_gssapi_root" != x && test -z "$KRB5_CONFIG"],
+         [AS_IF([test -x "${rra_gssapi_root}/bin/krb5-config"],
+             [KRB5_CONFIG="${rra_gssapi_root}/bin/krb5-config"])],
+         [AC_PATH_PROG([KRB5_CONFIG], [krb5-config])])
+     AS_IF([test x"$KRB5_CONFIG" != x && test -x "$KRB5_CONFIG"],
+         [AC_CACHE_CHECK([for gssapi support in krb5-config],
+             [rra_cv_lib_gssapi_config],
+             [AS_IF(["$KRB5_CONFIG" 2>&1 | grep gssapi >/dev/null 2>&1],
+                 [rra_cv_lib_gssapi_config=yes],
+                 [rra_cv_lib_gssapi_config=no])])
+          AS_IF([test "$rra_cv_lib_gssapi_config" = yes],
+              [GSSAPI_CPPFLAGS=`"$KRB5_CONFIG" --cflags gssapi 2>/dev/null`
+               GSSAPI_LIBS=`"$KRB5_CONFIG" --libs gssapi 2>/dev/null`],
+              [GSSAPI_CPPFLAGS=`"$KRB5_CONFIG" --cflags 2>/dev/null`
+               GSSAPI_LIBS=`"$KRB5_CONFIG" --libs 2>/dev/null`])
+          GSSAPI_CPPFLAGS=`echo "$GSSAPI_CPPFLAGS" \
+              | sed 's%-I/usr/include ?%%'`
+          _RRA_LIB_GSSAPI_CHECK],
+         [_RRA_LIB_GSSAPI_PATHS
+          _RRA_LIB_GSSAPI_MANUAL])])])