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88 lines
2.2 KiB
88 lines
2.2 KiB
dnl AC_C_DNS
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dnl Checks resolv.h presence and usability
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dnl Checks for specific lresolv exports
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dnl Checks for lresolve reentrance
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dnl
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dnl Note using AC_LINK_IFELSE instead of AC_CHECK_LIB
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dnl as symbols are often redefined in resolv.h
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AC_DEFUN([AC_C_DNS], [
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AC_ARG_ENABLE([dns],
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AC_HELP_STRING([--disable-dns], [disable support for database verification through DNS]),
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[want_dns=$enableval], [want_dns=yes]
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)
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if test $want_dns = yes; then
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ac_cv_have_lresolv=no
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AC_CHECK_HEADER([resolv.h],
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[
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AC_CACHE_CHECK([for dn_expand in std libs], [ac_cv_have_lresolv_std], [
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ac_cv_have_lresolv_std='no'
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AC_LINK_IFELSE([
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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int main() { return (long)dn_expand; }
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],
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[
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ac_cv_have_lresolv_std='yes'
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ac_cv_have_lresolv=''
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])
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])
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if test "x$ac_cv_have_lresolv" = "xno"; then
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bklibs=$LIBS
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LIBS=-lresolv
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AC_CACHE_CHECK([for dn_expand in -lresolv], [ac_cv_have_lresolv_lresolv], [
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ac_cv_have_lresolv_lresolv='yes'
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AC_LINK_IFELSE([
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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int main() { return (long)dn_expand; }
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],
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[
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ac_cv_have_lresolv_lresolv='yes'
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ac_cv_have_lresolv=' -lresolv'
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])
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])
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LIBS=$bklibs;
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fi
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],
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[ ac_cv_have_lresolv=no ],
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[
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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])
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if test "x$ac_cv_have_lresolv" != "xno"; then
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FRESHCLAM_LIBS="$FRESHCLAM_LIBS$ac_cv_have_lresolv"
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CLAMAV_MILTER_LIBS="$CLAMAV_MILTER_LIBS$ac_cv_have_lresolv"
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bklibs=$LIBS
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LIBS=$ac_cv_have_lresolv
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AC_DEFINE([HAVE_RESOLV_H],1,[have resolv.h])
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AC_CACHE_CHECK([for res_nquery in -lresolv], [ac_cv_have_lresolv_r], [
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ac_cv_have_lresolv_r='no'
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AC_LINK_IFELSE([
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <resolv.h>
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int main() { return (long)res_nquery; }
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],
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[
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ac_cv_have_lresolv_r='yes'
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]),
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])
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LIBS=$bklibs
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if test "x$ac_cv_have_lresolv_r" = "xyes"; then
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AC_DEFINE([HAVE_LRESOLV_R],1,[Define to 1 if -lresolv provides thread safe API's like res_nquery])
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fi
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else
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AC_MSG_WARN([****** DNS support disabled])
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fi
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fi
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])
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