Enable GnuTLS fallback
On systems with GNU/Linux kernel older than 3.17 (Debian 8 "jessie" for
example) the osmo_get_rand_id() would always return failure due to
missing getrandom() syscall.
To support such systems, let's add fallback code which uses GnuTLS
library. It can be disabled explicitly via '--disable-gnutls' option at
compile-time, otherwise ./configure will fail if both getrandom() and
GnuTLS are not available. When building with '--enable-embedded' the
fallback is disabled automatically.
Related: OS#1694
Change-Id: Ic77866ce65acf524b768882c751a4f9c0635740b
diff --git a/configure.ac b/configure.ac
index d9390cf..a8c1d2e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -130,6 +130,20 @@
AM_CONDITIONAL(ENABLE_PCSC, test "x$ENABLE_PCSC" = "xyes")
AC_SUBST(ENABLE_PCSC)
+AC_ARG_ENABLE([gnutls], [AS_HELP_STRING([--disable-gnutls], [Do not use GnuTLS fallback for missing getrandom()])],
+ [ENABLE_GNUTLS=$enableval], [ENABLE_GNUTLS="yes"])
+AM_CONDITIONAL(ENABLE_GNUTLS, test x"$ENABLE_GNUTLS" = x"yes")
+AS_IF([test "x$ENABLE_GNUTLS" = "xyes"], [
+ PKG_CHECK_MODULES([LIBGNUTLS], [gnutls >= 2.12.0])
+])
+AC_SUBST(ENABLE_GNUTLS)
+if test x"$ENABLE_GNUTLS" = x"yes"
+then
+ AC_SUBST([LIBGNUTLS_CFLAGS])
+ AC_SUBST([LIBGNUTLS_LIBS])
+ AC_DEFINE([USE_GNUTLS], [1], [Use GnuTLS as a fallback for missing getrandom()])
+fi
+
AC_ARG_ENABLE(plugin,
[AS_HELP_STRING(
[--disable-plugin],
@@ -228,12 +242,15 @@
AM_CONDITIONAL(ENABLE_PLUGIN, false)
AM_CONDITIONAL(ENABLE_MSGFILE, false)
AM_CONDITIONAL(ENABLE_SERIAL, false)
+ AM_CONDITIONAL(ENABLE_GNUTLS, false)
AM_CONDITIONAL(ENABLE_VTY, false)
AM_CONDITIONAL(ENABLE_CTRL, false)
AM_CONDITIONAL(ENABLE_UTILITIES, false)
AM_CONDITIONAL(ENABLE_GB, false)
+ AM_CONDITIONAL(ENABLE_GNUTLS, false)
AM_CONDITIONAL(ENABLE_PCSC, false)
AM_CONDITIONAL(ENABLE_PSEUDOTALLOC, true)
+ AC_DEFINE([USE_GNUTLS], [0])
AC_DEFINE([PANIC_INFLOOP],[1],[Use infinite loop on panic rather than fprintf/abort])
fi