From ab1c815340afc2883c9ef08795eebd9bed1858c5 Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Tue, 27 Jul 2021 03:36:45 +0200
Subject: Add support for MbedTLS

---
 configure.ac | 113 ++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 81 insertions(+), 32 deletions(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 82038e1..bd061fc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -128,43 +128,92 @@ fi
 AM_CONDITIONAL([HAVE_CYTHON],[test "x$CYTHON_SUB" = "xcython"])
 AC_SUBST([CYTHON_SUB])
 
-AC_ARG_ENABLE([openssl],
-            [AS_HELP_STRING([--disable-openssl],
+default_openssl=yes
+
+AC_ARG_WITH([mbedtls],
+            [AS_HELP_STRING([--without-mbedtls],
+            [Do not look for mbedtls])],
+            [use_mbedtls=$withval],
+            [use_mbedtls=no])
+if test "x$use_mbedtls" == "xyes"; then
+  default_openssl=no
+fi
+AC_ARG_WITH([gnutls],
+            [AS_HELP_STRING([--without-gnutls],
+            [Do not look for GnuTLS])],
+            [use_gnutls=$withval],
+            [use_gnutls=no])
+if test "x$use_gnutls" == "xyes"; then
+  default_openssl=no
+fi
+AC_ARG_WITH([openssl],
+            [AS_HELP_STRING([--without-openssl],
             [Do not look for OpenSSL])],
-            [use_openssl=$enableval],
-            [use_openssl=yes])
-
-pkg_req_openssl="openssl >= 0.9.8"
-PKG_CHECK_MODULES(openssl, $pkg_req_openssl, have_openssl=yes, have_openssl=no)
-if test "x$have_openssl" = "xyes"; then
-  if test "x$use_openssl" != "xyes"; then
-    enable_openssl=no
-    echo "*** Note: OpenSSL support explicitly disabled ***"
-  else
-    enable_openssl=yes
+            [use_openssl=$withval],
+            [use_openssl=$default_openssl])
+
+if test "x$use_mbedtls" == "xyes"; then
+  CACHED_CFLAGS="$CFLAGS"
+  conf_mbedtls_CFLAGS=""
+  if test -n "$mbedtls_INCLUDES"; then
+    CFLAGS=" -I$mbedtls_INCLUDES"
+    conf_mbedtls_CFLAGS="-I$mbedtls_INCLUDES"
   fi
-else
-  if test "x$use_openssl" == "xyes" -a "x$have_openssl" != "xyes"; then
-    AC_MSG_ERROR([OpenSSL support explicitly requested but OpenSSL could not be found])
+  conf_mbedtls_LIBS=""
+  if test -n "$mbedtls_LIBDIR"; then
+    conf_mbedtls_LIBS+=" -L$mbedtls_LIBDIR"
   fi
-fi
-
-if test "x$enable_openssl" = "xyes"; then
-  AC_DEFINE(HAVE_OPENSSL, 1, [Define if you have OpenSSL support])
-  AC_SUBST(openssl_CFLAGS)
-  AC_SUBST(openssl_LIBS)
-  ssl_provider="OpenSSL";
-  ssl_requires="$pkg_req_openssl"
+  if test -n "$mbedtls_LIBS"; then
+    conf_mbedtls_LIBS+=" $mbedtls_LIBS"
+  else
+    conf_mbedtls_LIBS+=" -lmbedtls -lmbedx509 -lmbedcrypto"
+  fi
+  AC_CHECK_HEADER(mbedtls/ssl.h, [break], [AC_MSG_ERROR([MbedTLS support explicitly requested, but includes could not be found. Try setting mbedtls_INCLUDES=/path/to/mbedtls/include])])
+  CFLAGS="$CACHED_CFLAGS"
+  AC_DEFINE(HAVE_MBEDTLS, 1, [Define if you have MbedTLS support])
+  ssl_lib_CFLAGS="$conf_mbedtls_CFLAGS"
+  ssl_lib_LIBS="$conf_mbedtls_LIBS"
+  AC_SUBST(ssl_lib_CFLAGS)
+  AC_SUBST(ssl_lib_LIBS)
+  ssl_provider="MbedTLS";
+  ssl_requires=""
   AC_SUBST(ssl_requires)
 else
-  pkg_req_gnutls="gnutls >= 2.2.0"
-  pkg_req_libtasn1="libtasn1 >= 1.1"
-  PKG_CHECK_MODULES(libgnutls, $pkg_req_gnutls)
-  AC_CHECK_LIB(gcrypt, gcry_control, [AC_SUBST(libgcrypt_LIBS,[-lgcrypt])], [AC_MSG_ERROR([libgcrypt is required to build libimobiledevice with GnuTLS])])
-  PKG_CHECK_MODULES(libtasn1, $pkg_req_libtasn1)
-  ssl_provider="GnuTLS"
-  ssl_requires="$pkg_req_gnutls $pkg_req_libtasn1"
-  AC_SUBST(ssl_requires)
+  if test "x$use_openssl" == "xyes"; then
+    pkg_req_openssl="openssl >= 0.9.8"
+    PKG_CHECK_MODULES(openssl, $pkg_req_openssl, have_openssl=yes, have_openssl=no)
+    if test "x$have_openssl" != "xyes"; then
+      AC_MSG_ERROR([OpenSSL support explicitly requested but OpenSSL could not be found])
+    else
+      AC_DEFINE(HAVE_OPENSSL, 1, [Define if you have OpenSSL support])
+      ssl_lib_CFLAGS="$openssl_CFLAGS"
+      ssl_lib_LIBS="$openssl_LIBS"
+      AC_SUBST(ssl_lib_CFLAGS)
+      AC_SUBST(ssl_lib_LIBS)
+      ssl_provider="OpenSSL";
+      ssl_requires="$pkg_req_openssl"
+      AC_SUBST(ssl_requires)
+    fi
+  else
+    if test "x$use_gnutls" == "xyes"; then
+      pkg_req_gnutls="gnutls >= 2.2.0"
+      pkg_req_libtasn1="libtasn1 >= 1.1"
+      PKG_CHECK_MODULES(libgnutls, $pkg_req_gnutls)
+      AC_CHECK_LIB(gcrypt, gcry_control, [AC_SUBST(libgcrypt_LIBS,[-lgcrypt])], [AC_MSG_ERROR([libgcrypt is required to build libimobiledevice with GnuTLS])])
+      PKG_CHECK_MODULES(libtasn1, $pkg_req_libtasn1)
+
+      AC_DEFINE(HAVE_GNUTLS, 1, [Define if you have GnuTLS support])
+      ssl_lib_CFLAGS="$libgnutls_CFLAGS $libtasn1_CFLAGS $libgcrypt_CFLAGS"
+      ssl_lib_LIBS="$libgnutls_LIBS $libtasn1_LIBS $libgcrypt_LIBS"
+      AC_SUBST(ssl_lib_CFLAGS)
+      AC_SUBST(ssl_lib_LIBS)
+      ssl_provider="GnuTLS"
+      ssl_requires="$pkg_req_gnutls $pkg_req_libtasn1"
+      AC_SUBST(ssl_requires)
+    else
+      AC_MSG_ERROR([No SSL library configured. $PACKAGE cannot be built without a supported SSL library.])
+    fi
+  fi
 fi
 
 AC_ARG_ENABLE([debug],
-- 
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