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dnl Copyright (c) 2001-2004, Roger Dingledine
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dnl Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson
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dnl Copyright (c) 2007-2017, The Tor Project, Inc.
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dnl See LICENSE for licensing information
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AC_PREREQ([2.63])
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AC_INIT([tor],[0.3.3.0-alpha-dev])
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AC_CONFIG_SRCDIR([src/or/main.c])
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AC_CONFIG_MACRO_DIR([m4])
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# "foreign" means we don't follow GNU package layout standards
# "1.11" means we require automake version 1.11 or newer
# "subdir-objects" means put .o files in the same directory as the .c files
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AM_INIT_AUTOMAKE([foreign 1.11 subdir-objects -Wall -Werror])
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m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
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AC_CONFIG_HEADERS([orconfig.h])
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AC_USE_SYSTEM_EXTENSIONS
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AC_CANONICAL_HOST

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PKG_PROG_PKG_CONFIG

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if test -f "/etc/redhat-release"; then
  if test -f "/usr/kerberos/include"; then
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    CPPFLAGS="$CPPFLAGS -I/usr/kerberos/include"
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  fi
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fi
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# Not a no-op; we want to make sure that CPPFLAGS is set before we use
# the += operator on it in src/or/Makefile.am
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CPPFLAGS="$CPPFLAGS -I\${top_srcdir}/src/common"
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AC_ARG_ENABLE(openbsd-malloc,
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   AS_HELP_STRING(--enable-openbsd-malloc, [use malloc code from OpenBSD.  Linux only]))
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AC_ARG_ENABLE(static-openssl,
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   AS_HELP_STRING(--enable-static-openssl, [link against a static openssl library. Requires --with-openssl-dir]))
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AC_ARG_ENABLE(static-libevent,
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   AS_HELP_STRING(--enable-static-libevent, [link against a static libevent library. Requires --with-libevent-dir]))
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AC_ARG_ENABLE(static-zlib,
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   AS_HELP_STRING(--enable-static-zlib, [link against a static zlib library. Requires --with-zlib-dir]))
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AC_ARG_ENABLE(static-tor,
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   AS_HELP_STRING(--enable-static-tor, [create an entirely static Tor binary. Requires --with-openssl-dir and --with-libevent-dir and --with-zlib-dir]))
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AC_ARG_ENABLE(unittests,
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   AS_HELP_STRING(--disable-unittests, [don't build unit tests for Tor. Risky!]))
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AC_ARG_ENABLE(coverage,
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   AS_HELP_STRING(--enable-coverage, [enable coverage support in the unit-test build]))
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AC_ARG_ENABLE(asserts-in-tests,
   AS_HELP_STRING(--disable-asserts-in-tests, [disable tor_assert() calls in the unit tests, for branch coverage]))
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AC_ARG_ENABLE(system-torrc,
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   AS_HELP_STRING(--disable-system-torrc, [don't look for a system-wide torrc file]))
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AC_ARG_ENABLE(libfuzzer,
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   AS_HELP_STRING(--enable-libfuzzer, [build extra fuzzers based on 'libfuzzer']))
AC_ARG_ENABLE(oss-fuzz,
   AS_HELP_STRING(--enable-oss-fuzz, [build extra fuzzers based on 'oss-fuzz' environment]))
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AC_ARG_ENABLE(memory-sentinels,
   AS_HELP_STRING(--disable-memory-sentinels, [disable code that tries to prevent some kinds of memory access bugs. For fuzzing only.]))
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AC_ARG_ENABLE(rust,
   AS_HELP_STRING(--enable-rust, [enable rust integration]))
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AC_ARG_ENABLE(cargo-online-mode,
   AS_HELP_STRING(--enable-cargo-online-mode, [Allow cargo to make network requests to fetch crates. For builds with rust only.]))
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if test "x$enable_coverage" != "xyes" -a "x$enable_asserts_in_tests" = "xno" ; then
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    AC_MSG_ERROR([Can't disable assertions outside of coverage build])
fi

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AM_CONDITIONAL(UNITTESTS_ENABLED, test "x$enable_unittests" != "xno")
AM_CONDITIONAL(COVERAGE_ENABLED, test "x$enable_coverage" = "xyes")
AM_CONDITIONAL(DISABLE_ASSERTS_IN_UNIT_TESTS, test "x$enable_asserts_in_tests" = "xno")
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AM_CONDITIONAL(LIBFUZZER_ENABLED, test "x$enable_libfuzzer" = "xyes")
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AM_CONDITIONAL(OSS_FUZZ_ENABLED, test "x$enable_oss_fuzz" = "xyes")
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AM_CONDITIONAL(USE_RUST, test "x$enable_rust" = "xyes")
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if test "$enable_static_tor" = "yes"; then
  enable_static_libevent="yes";
  enable_static_openssl="yes";
  enable_static_zlib="yes";
  CFLAGS="$CFLAGS -static"
fi
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if test "$enable_system_torrc" = "no"; then
  AC_DEFINE(DISABLE_SYSTEM_TORRC, 1,
            [Defined if we're not going to look for a torrc in SYSCONF])
fi

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if test "$enable_memory_sentinels" = "no"; then
  AC_DEFINE(DISABLE_MEMORY_SENTINELS, 1,
           [Defined if we're turning off memory safety code to look for bugs])
fi

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AM_CONDITIONAL(USE_OPENBSD_MALLOC, test "x$enable_openbsd_malloc" = "xyes")
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AC_ARG_ENABLE(asciidoc,
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     AS_HELP_STRING(--disable-asciidoc, [don't use asciidoc (disables building of manpages)]),
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     [case "${enableval}" in
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        "yes") asciidoc=true ;;
        "no")  asciidoc=false ;;
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        *) AC_MSG_ERROR(bad value for --disable-asciidoc) ;;
      esac], [asciidoc=true])

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# systemd notify support
AC_ARG_ENABLE(systemd,
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      AS_HELP_STRING(--enable-systemd, [enable systemd notification support]),
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      [case "${enableval}" in
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        "yes") systemd=true ;;
        "no")  systemd=false ;;
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        * ) AC_MSG_ERROR(bad value for --enable-systemd) ;;
      esac], [systemd=auto])



# systemd support
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if test "x$enable_systemd" = "xno"; then
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    have_systemd=no;
else
    PKG_CHECK_MODULES(SYSTEMD,
        [libsystemd-daemon],
        have_systemd=yes,
        have_systemd=no)
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    if test "x$have_systemd" = "xno"; then
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        AC_MSG_NOTICE([Okay, checking for systemd a different way...])
        PKG_CHECK_MODULES(SYSTEMD,
            [libsystemd],
            have_systemd=yes,
            have_systemd=no)
    fi
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fi

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if test "x$have_systemd" = "xyes"; then
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    AC_DEFINE(HAVE_SYSTEMD,1,[Have systemd])
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    TOR_SYSTEMD_CFLAGS="${SYSTEMD_CFLAGS}"
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    TOR_SYSTEMD_LIBS="${SYSTEMD_LIBS}"
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    PKG_CHECK_MODULES(LIBSYSTEMD209, [libsystemd >= 209],
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         [AC_DEFINE(HAVE_SYSTEMD_209,1,[Have systemd v209 or more])], [])
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fi
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AC_SUBST(TOR_SYSTEMD_CFLAGS)
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AC_SUBST(TOR_SYSTEMD_LIBS)

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if test "x$enable_systemd" = "xyes" -a "x$have_systemd" != "xyes" ; then
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    AC_MSG_ERROR([Explicitly requested systemd support, but systemd not found])
fi

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case "$host" in
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   *-*-solaris* )
     AC_DEFINE(_REENTRANT, 1, [Define on some platforms to activate x_r() functions in time.h])
     ;;
esac

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AC_ARG_ENABLE(gcc-warnings,
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     AS_HELP_STRING(--enable-gcc-warnings, [deprecated alias for enable-fatal-warnings]))
AC_ARG_ENABLE(fatal-warnings,
     AS_HELP_STRING(--enable-fatal-warnings, [tell the compiler to treat all warnings as errors.]))
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AC_ARG_ENABLE(gcc-warnings-advisory,
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     AS_HELP_STRING(--disable-gcc-warnings-advisory, [disable the regular verbose warnings]))
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dnl Others suggest '/gs /safeseh /nxcompat /dynamicbase' for non-gcc on Windows
AC_ARG_ENABLE(gcc-hardening,
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    AS_HELP_STRING(--disable-gcc-hardening, [disable compiler security checks]))
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dnl Deprecated --enable-expensive-hardening but keep it for now for backward compat.
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AC_ARG_ENABLE(expensive-hardening,
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    AS_HELP_STRING(--enable-expensive-hardening, [enable more fragile and expensive compiler hardening; makes Tor slower]))
AC_ARG_ENABLE(fragile-hardening,
    AS_HELP_STRING(--enable-fragile-hardening, [enable more fragile and expensive compiler hardening; makes Tor slower]))
if test "x$enable_expensive_hardening" = "xyes" || test "x$enable_fragile_hardening" = "xyes"; then
  fragile_hardening="yes"
fi
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dnl Linker hardening options
dnl Currently these options are ELF specific - you can't use this with MacOSX
AC_ARG_ENABLE(linker-hardening,
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    AS_HELP_STRING(--disable-linker-hardening, [disable linker security fixups]))
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AC_ARG_ENABLE(local-appdata,
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   AS_HELP_STRING(--enable-local-appdata, [default to host local application data paths on Windows]))
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if test "$enable_local_appdata" = "yes"; then
  AC_DEFINE(ENABLE_LOCAL_APPDATA, 1,
            [Defined if we default to host local appdata paths on Windows])
fi

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# Tor2web mode flag
AC_ARG_ENABLE(tor2web-mode,
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     AS_HELP_STRING(--enable-tor2web-mode, [support tor2web non-anonymous mode]),
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[if test "x$enableval" = "xyes"; then
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    CFLAGS="$CFLAGS -D ENABLE_TOR2WEB_MODE=1"
fi])

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AC_ARG_ENABLE(tool-name-check,
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     AS_HELP_STRING(--disable-tool-name-check, [check for sanely named toolchain when cross-compiling]))
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AC_ARG_ENABLE(seccomp,
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     AS_HELP_STRING(--disable-seccomp, [do not attempt to use libseccomp]))
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AC_ARG_ENABLE(libscrypt,
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     AS_HELP_STRING(--disable-libscrypt, [do not attempt to use libscrypt]))
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dnl Enable event tracing which are transformed to debug log statement.
AC_ARG_ENABLE(event-tracing-debug,
     AS_HELP_STRING(--enable-event-tracing-debug, [build with event tracing to debug log]))
AM_CONDITIONAL([USE_EVENT_TRACING_DEBUG], [test "x$enable_event_tracing_debug" = "xyes"])

if test x$enable_event_tracing_debug = xyes; then
  AC_DEFINE([USE_EVENT_TRACING_DEBUG], [1], [Tracing framework to log debug])
  AC_DEFINE([TOR_EVENT_TRACING_ENABLED], [1], [Compile the event tracing instrumentation])
fi

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dnl check for the correct "ar" when cross-compiling.
dnl   (AM_PROG_AR was new in automake 1.11.2, which we do not yet require,
dnl    so kludge up a replacement for the case where it isn't there yet.)
m4_ifdef([AM_PROG_AR],
         [AM_PROG_AR],
         [AN_MAKEVAR([AR], [AC_PROG_AR])
          AN_PROGRAM([ar], [AC_PROG_AR])
          AC_DEFUN([AC_PROG_AR], [AC_CHECK_TOOL([AR], [ar], [:])])
          AC_PROG_AR])
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dnl Check whether the above macro has settled for a simply named tool even
dnl though we're cross compiling. We must do this before running AC_PROG_CC,
dnl because that will find any cc on the system, not only the cross-compiler,
dnl and then verify that a binary built with this compiler runs on the
dnl build system. It will then come to the false conclusion that we're not
dnl cross-compiling.
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if test "x$enable_tool_name_check" != "xno"; then
    if test "x$ac_tool_warned" = "xyes"; then
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        AC_MSG_ERROR([We are cross compiling but could not find a properly named toolchain. Do you have your cross-compiling toolchain in PATH? (You can --disable-tool-name-check to ignore this.)])
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	elif test "x$ac_ct_AR" != "x" -a "x$cross_compiling" = "xmaybe"; then
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		AC_MSG_ERROR([We think we are cross compiling but could not find a properly named toolchain. Do you have your cross-compiling toolchain in PATH? (You can --disable-tool-name-check to ignore this.)])
	fi
fi

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AC_PROG_CC
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AC_PROG_CPP
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AC_PROG_MAKE_SET
AC_PROG_RANLIB
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AC_PROG_SED
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AC_ARG_VAR([PERL], [path to Perl binary])
AC_CHECK_PROGS([PERL], [perl])
AM_CONDITIONAL(USE_PERL, [test "x$ac_cv_prog_PERL" != "x"])
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dnl check for asciidoc and a2x
AC_PATH_PROG([ASCIIDOC], [asciidoc], none)
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AC_PATH_PROGS([A2X], [a2x a2x.py], none)
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AM_CONDITIONAL(USE_ASCIIDOC, test "x$asciidoc" = "xtrue")
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AM_PROG_CC_C_O
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AC_PROG_CC_C99
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AC_ARG_VAR([PYTHON], [path to Python binary])
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AC_CHECK_PROGS(PYTHON, [python python2 python2.7 python3 python3.3])
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if test "x$PYTHON" = "x"; then
  AC_MSG_WARN([Python unavailable; some tests will not be run.])
fi
AM_CONDITIONAL(USEPYTHON, [test "x$PYTHON" != "x"])

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dnl List all external rust crates we depend on here. Include the version
rust_crates="libc-0.2.22"
AC_SUBST(rust_crates)
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ifdef([AC_C_FLEXIBLE_ARRAY_MEMBER], [
AC_C_FLEXIBLE_ARRAY_MEMBER
], [
 dnl Maybe we've got an old autoconf...
 AC_CACHE_CHECK([for flexible array members],
     tor_cv_c_flexarray,
     [AC_COMPILE_IFELSE(
       AC_LANG_PROGRAM([
 struct abc { int a; char b[]; };
], [
 struct abc *def = malloc(sizeof(struct abc)+sizeof(char));
 def->b[0] = 33;
]),
  [tor_cv_c_flexarray=yes],
  [tor_cv_c_flexarray=no])])
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 if test "$tor_cv_flexarray" = "yes"; then
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   AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [], [Define to nothing if C supports flexible array members, and to 1 if it does not.])
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 else
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   AC_DEFINE([FLEXIBLE_ARRAY_MEMBER], [1], [Define to nothing if C supports flexible array members, and to 1 if it does not.])
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 fi
])

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AC_CACHE_CHECK([for working C99 mid-block declaration syntax],
      tor_cv_c_c99_decl,
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([], [int x; x = 3; int y; y = 4 + x;])],
	 [tor_cv_c_c99_decl=yes],
	 [tor_cv_c_c99_decl=no] )])
if test "$tor_cv_c_c99_decl" != "yes"; then
  AC_MSG_ERROR([Your compiler doesn't support c99 mid-block declarations. This is required as of Tor 0.2.6.x])
fi

AC_CACHE_CHECK([for working C99 designated initializers],
      tor_cv_c_c99_designated_init,
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([struct s { int a; int b; };],
  	       [[ struct s ss = { .b = 5, .a = 6 }; ]])],
	 [tor_cv_c_c99_designated_init=yes],
	 [tor_cv_c_c99_designated_init=no] )])

if test "$tor_cv_c_c99_designated_init" != "yes"; then
  AC_MSG_ERROR([Your compiler doesn't support c99 designated initializers. This is required as of Tor 0.2.6.x])
fi

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TORUSER=_tor
AC_ARG_WITH(tor-user,
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        AS_HELP_STRING(--with-tor-user=NAME, [specify username for tor daemon]),
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        [
           TORUSER=$withval
        ]
)
AC_SUBST(TORUSER)

TORGROUP=_tor
AC_ARG_WITH(tor-group,
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        AS_HELP_STRING(--with-tor-group=NAME, [specify group name for tor daemon]),
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        [
           TORGROUP=$withval
        ]
)
AC_SUBST(TORGROUP)

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dnl If _WIN32 is defined and non-zero, we are building for win32
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AC_MSG_CHECKING([for win32])
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AC_RUN_IFELSE([AC_LANG_SOURCE([
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int main(int c, char **v) {
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#ifdef _WIN32
#if _WIN32
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  return 0;
#else
  return 1;
#endif
#else
  return 2;
#endif
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}])],
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bwin32=true; AC_MSG_RESULT([yes]),
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bwin32=false; AC_MSG_RESULT([no]),
bwin32=cross; AC_MSG_RESULT([cross])
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)

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if test "$bwin32" = "cross"; then
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AC_MSG_CHECKING([for win32 (cross)])
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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#ifdef _WIN32
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int main(int c, char **v) {return 0;}
#else
#error
int main(int c, char **v) {return x(y);}
#endif
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])],
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bwin32=true; AC_MSG_RESULT([yes]),
bwin32=false; AC_MSG_RESULT([no]))
fi

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AH_BOTTOM([
#ifdef _WIN32
/* Defined to access windows functions and definitions for >=WinXP */
# ifndef WINVER
#  define WINVER 0x0501
# endif

/* Defined to access _other_ windows functions and definitions for >=WinXP */
# ifndef _WIN32_WINNT
#  define _WIN32_WINNT 0x0501
# endif

/* Defined to avoid including some windows headers as part of Windows.h */
# ifndef WIN32_LEAN_AND_MEAN
#  define WIN32_LEAN_AND_MEAN 1
# endif
#endif
])

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AM_CONDITIONAL(BUILD_NT_SERVICES, test "x$bwin32" = "xtrue")
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AM_CONDITIONAL(BUILD_LIBTORRUNNER, test "x$bwin32" != "xtrue")
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dnl Enable C99 when compiling with MIPSpro
AC_MSG_CHECKING([for MIPSpro compiler])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(, [
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#if (defined(__sgi) && defined(_COMPILER_VERSION))
#error
  return x(y);
#endif
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])],
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bmipspro=false; AC_MSG_RESULT(no),
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bmipspro=true; AC_MSG_RESULT(yes))
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if test "$bmipspro" = "true"; then
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  CFLAGS="$CFLAGS -c99"
fi

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AC_C_BIGENDIAN

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if test "x$enable_rust" = "xyes"; then
  AC_ARG_VAR([RUSTC], [path to the rustc binary])
  AC_CHECK_PROG([RUSTC], [rustc], [rustc],[no])
  if test "x$RUSTC" = "xno"; then
    AC_MSG_ERROR([rustc unavailable but rust integration requested.])
  fi

  AC_ARG_VAR([CARGO], [path to the cargo binary])
  AC_CHECK_PROG([CARGO], [cargo], [cargo],[no])
  if test "x$CARGO" = "xno"; then
    AC_MSG_ERROR([cargo unavailable but rust integration requested.])
  fi

  AC_DEFINE([HAVE_RUST], 1, [have Rust])
  if test "x$enable_cargo_online_mode" = "xyes"; then
    CARGO_ONLINE=
    RUST_DL=#
  else
    CARGO_ONLINE=--frozen
    RUST_DL=

    dnl When we're not allowed to touch the network, we need crate dependencies
    dnl locally available.
    AC_MSG_CHECKING([rust crate dependencies])
    AC_ARG_VAR([RUST_DEPENDENCIES], [path to directory with local crate mirror])
    if test "x$RUST_DEPENDENCIES" = "x"; then
      RUST_DEPENDENCIES="$srcdir/src/ext/rust/"
      NEED_MOD=1
    fi
    if test ! -d "$RUST_DEPENDENCIES"; then
      AC_MSG_ERROR([Rust dependency directory $RUST_DEPENDENCIES does not exist. Specify a dependency directory using the RUST_DEPENDENCIES variable or allow cargo to fetch crates using --enable-cargo-online-mode.])
    fi
    for dep in $rust_crates; do
      if test ! -d "$RUST_DEPENDENCIES"/"$dep"; then
        AC_MSG_ERROR([Failure to find rust dependency $RUST_DEPENDENCIES/$dep. Specify a dependency directory using the RUST_DEPENDENCIES variable or allow cargo to fetch crates using --enable-cargo-online-mode.])
      fi
    done
    if test "x$NEED_MOD" = "x1"; then
      dnl When looking for dependencies from cargo, pick right directory
      RUST_DEPENDENCIES="../../src/ext/rust"
    fi
  fi

  dnl For now both MSVC and MinGW rust libraries will output static libs with
  dnl the MSVC naming convention.
  if test "$bwin32" = "true"; then
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    TOR_RUST_STATIC_NAME=tor_rust.lib
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  else
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    TOR_RUST_STATIC_NAME=libtor_rust.a
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  fi

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  AC_SUBST(TOR_RUST_STATIC_NAME)
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  AC_SUBST(CARGO_ONLINE)
  AC_SUBST(RUST_DL)

  dnl Let's check the rustc version, too
  AC_MSG_CHECKING([rust version])
  RUSTC_VERSION_MAJOR=`$RUSTC --version | cut -d ' ' -f 2 | cut -d '.' -f 1`
  RUSTC_VERSION_MINOR=`$RUSTC --version | cut -d ' ' -f 2 | cut -d '.' -f 2`
  if test "x$RUSTC_VERSION_MAJOR" = "x" -o "x$RUSTC_VERSION_MINOR" = "x"; then
    AC_MSG_ERROR([rustc version couldn't be identified])
  fi
  if test "$RUSTC_VERSION_MAJOR" -lt 2 -a "$RUSTC_VERSION_MINOR" -lt 14; then
    AC_MSG_ERROR([rustc must be at least version 1.14])
  fi
fi

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AC_SEARCH_LIBS(socket, [socket network])
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AC_SEARCH_LIBS(gethostbyname, [nsl])
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AC_SEARCH_LIBS(dlopen, [dl])
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AC_SEARCH_LIBS(inet_aton, [resolv])
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AC_SEARCH_LIBS(backtrace, [execinfo])
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saved_LIBS="$LIBS"
AC_SEARCH_LIBS([clock_gettime], [rt])
if test "$LIBS" != "$saved_LIBS"; then
   # Looks like we need -lrt for clock_gettime().
   have_rt=yes
fi
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AC_SEARCH_LIBS(pthread_create, [pthread])
AC_SEARCH_LIBS(pthread_detach, [pthread])
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AM_CONDITIONAL(THREADS_WIN32, test "$bwin32" = "true")
AM_CONDITIONAL(THREADS_PTHREADS, test "$bwin32" = "false")
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AC_CHECK_FUNCS(
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        _NSGetEnviron \
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	RtlSecureZeroMemory \
	SecureZeroMemory \
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        accept4 \
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        backtrace \
        backtrace_symbols_fd \
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	eventfd \
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	explicit_bzero \
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	timingsafe_memcmp \
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        flock \
        ftime \
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        get_current_dir_name \
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        getaddrinfo \
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        getifaddrs \
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        getpass \
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        getrlimit \
        gettimeofday \
        gmtime_r \
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	htonll \
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        inet_aton \
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        ioctl \
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        issetugid \
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        llround \
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        localtime_r \
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        lround \
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        memmem \
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        memset_s \
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	pipe \
	pipe2 \
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        prctl \
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	readpassphrase \
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        rint \
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        sigaction \
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        socketpair \
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	statvfs \
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        strlcat \
        strlcpy \
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	strnlen \
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        strptime \
        strtok_r \
        strtoull \
        sysconf \
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	sysctl \
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	truncate \
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        uname \
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	usleep \
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        vasprintf \
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	_vscprintf
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)
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# Apple messed up when they added two functions functions in Sierra: they
# forgot to decorate them with appropriate AVAILABLE_MAC_OS_VERSION
# checks. So we should only probe for those functions if we are sure that we
# are not targetting OSX 10.11 or earlier.
AC_MSG_CHECKING([for a pre-Sierra OSX build target])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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#ifdef __APPLE__
#  include <AvailabilityMacros.h>
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#  ifndef MAC_OS_X_VERSION_10_12
#    define MAC_OS_X_VERSION_10_12 101200
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#  endif
#  if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
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#    if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12
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#      error "Running on Mac OSX 10.11 or earlier"
#    endif
#  endif
#endif
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]], [[]])],
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   [on_macos_pre_10_12=no ; AC_MSG_RESULT([no])],
   [on_macos_pre_10_12=yes; AC_MSG_RESULT([yes])])

if test "$on_macos_pre_10_12" = "no"; then
  AC_CHECK_FUNCS(
        clock_gettime \
        getentropy \
  )
fi

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if test "$bwin32" != "true"; then
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  AC_CHECK_HEADERS(pthread.h)
  AC_CHECK_FUNCS(pthread_create)
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  AC_CHECK_FUNCS(pthread_condattr_setclock)
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fi

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if test "$bwin32" = "true"; then
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  AC_CHECK_DECLS([SecureZeroMemory, _getwch], , , [
#include <windows.h>
#include <conio.h>
#include <wchar.h>
                 ])
fi

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AM_CONDITIONAL(BUILD_READPASSPHRASE_C,
  test "x$ac_cv_func_readpassphrase" = "xno" && test "$bwin32" = "false")
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dnl ------------------------------------------------------
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dnl Where do you live, libevent?  And how do we call you?
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if test "$bwin32" = "true"; then
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  TOR_LIB_WS32=-lws2_32
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  TOR_LIB_IPHLPAPI=-liphlpapi
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  # Some of the cargo-cults recommend -lwsock32 as well, but I don't
  # think it's actually necessary.
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  TOR_LIB_GDI=-lgdi32
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  TOR_LIB_USERENV=-luserenv
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else
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  TOR_LIB_WS32=
  TOR_LIB_GDI=
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  TOR_LIB_USERENV=
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fi
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AC_SUBST(TOR_LIB_WS32)
AC_SUBST(TOR_LIB_GDI)
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AC_SUBST(TOR_LIB_IPHLPAPI)
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AC_SUBST(TOR_LIB_USERENV)
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tor_libevent_pkg_redhat="libevent"
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tor_libevent_pkg_debian="libevent-dev"
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tor_libevent_devpkg_redhat="libevent-devel"
tor_libevent_devpkg_debian="libevent-dev"

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dnl On Gnu/Linux or any place we require it, we'll add librt to the Libevent
dnl linking for static builds.
STATIC_LIBEVENT_FLAGS=""
if test "$enable_static_libevent" = "yes"; then
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    if test "$have_rt" = "yes"; then
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      STATIC_LIBEVENT_FLAGS=" -lrt "
    fi
fi

TOR_SEARCH_LIBRARY(libevent, $trylibeventdir, [-levent $STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32], [
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#ifdef _WIN32
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#include <winsock2.h>
#endif
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#include <sys/time.h>
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#include <sys/types.h>
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#include <event2/event.h>], [
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#ifdef _WIN32
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#include <winsock2.h>
#endif
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struct event_base;
struct event_base *event_base_new(void);],
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    [
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#ifdef _WIN32
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{WSADATA d; WSAStartup(0x101,&d); }
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#endif
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event_base_new();
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], [--with-libevent-dir], [/opt/libevent])
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dnl Determine the incantation needed to link libevent.
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save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
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save_CPPFLAGS="$CPPFLAGS"
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LIBS="$STATIC_LIBEVENT_FLAGS $TOR_LIB_WS32 $save_LIBS"
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LDFLAGS="$TOR_LDFLAGS_libevent $LDFLAGS"
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CPPFLAGS="$TOR_CPPFLAGS_libevent $CPPFLAGS"
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AC_CHECK_HEADERS(event2/event.h event2/dns.h event2/bufferevent_ssl.h)

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if test "$enable_static_libevent" = "yes"; then
   if test "$tor_cv_library_libevent_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-libevent-dir=x option when using --enable-static-libevent")
   else
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     TOR_LIBEVENT_LIBS="$TOR_LIBDIR_libevent/libevent.a $STATIC_LIBEVENT_FLAGS"
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   fi
else
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     if test "x$ac_cv_header_event2_event_h" = "xyes"; then
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       AC_SEARCH_LIBS(event_new, [event event_core], , AC_MSG_ERROR("libevent2 is installed but linking it failed while searching for event_new"))
       AC_SEARCH_LIBS(evdns_base_new, [event event_extra], , AC_MSG_ERROR("libevent2 is installed but linking it failed while searching for evdns_base_new"))
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       if test "$ac_cv_search_event_new" != "none required"; then
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         TOR_LIBEVENT_LIBS="$ac_cv_search_event_new"
       fi
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       if test "$ac_cv_search_evdns_base_new" != "none required"; then
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         TOR_LIBEVENT_LIBS="$ac_cv_search_evdns_base_new $TOR_LIBEVENT_LIBS"
       fi
     else
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       AC_MSG_ERROR("libevent2 is required but the headers could not be found")
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     fi
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fi

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dnl Now check for particular libevent functions.
AC_CHECK_FUNCS([evutil_secure_rng_set_urandom_device_file \
                evutil_secure_rng_add_bytes \
])

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LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

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dnl Check that libevent is at least at version 2.0.10, the first stable
dnl release of its series
CPPFLAGS="$CPPFLAGS $TOR_CPPFLAGS_libevent"
AC_MSG_CHECKING([whether Libevent is new enough])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
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#include <event2/event.h>
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#if !defined(LIBEVENT_VERSION_NUMBER) || LIBEVENT_VERSION_NUMBER < 0x02000a00
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#error
int x = y(zz);
#else
int x = 1;
#endif
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])], [ AC_MSG_RESULT([yes]) ],
   [ AC_MSG_RESULT([no])
     AC_MSG_ERROR([Libevent is not new enough.  We require 2.0.10-stable or later]) ] )

LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

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AC_SUBST(TOR_LIBEVENT_LIBS)
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dnl ------------------------------------------------------
dnl Where do you live, libm?

dnl On some platforms (Haiku/BeOS) the math library is
dnl part of libroot. In which case don't link against lm
TOR_LIB_MATH=""
save_LIBS="$LIBS"
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AC_SEARCH_LIBS(pow, [m], , AC_MSG_ERROR([Could not find pow in libm or libc.]))
if test "$ac_cv_search_pow" != "none required"; then
    TOR_LIB_MATH="$ac_cv_search_pow"
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fi
LIBS="$save_LIBS"
AC_SUBST(TOR_LIB_MATH)

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dnl ------------------------------------------------------
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dnl Where do you live, openssl?  And how do we call you?
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tor_openssl_pkg_debian="libssl-dev"
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tor_openssl_devpkg_redhat="openssl-devel"
tor_openssl_devpkg_debian="libssl-dev"

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ALT_openssl_WITHVAL=""
AC_ARG_WITH(ssl-dir,
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  AS_HELP_STRING(--with-ssl-dir=PATH, [obsolete alias for --with-openssl-dir]),
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  [
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      if test "x$withval" != "xno" && test "x$withval" != "x"; then
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         ALT_openssl_WITHVAL="$withval"
      fi
  ])

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AC_MSG_NOTICE([Now, we'll look for OpenSSL >= 1.0.1])
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TOR_SEARCH_LIBRARY(openssl, $tryssldir, [-lssl -lcrypto $TOR_LIB_GDI],
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    [#include <openssl/ssl.h>],
    [struct ssl_method_st; const struct ssl_method_st *TLSv1_1_method(void);],
    [TLSv1_1_method();], [],
    [/usr/local/opt/openssl /usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local /usr/athena /opt/openssl])
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dnl XXXX check for OPENSSL_VERSION_NUMBER == SSLeay()

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if test "$enable_static_openssl" = "yes"; then
   if test "$tor_cv_library_openssl_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-openssl-dir=x option when using --enable-static-openssl")
   else
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     TOR_OPENSSL_LIBS="$TOR_LIBDIR_openssl/libssl.a $TOR_LIBDIR_openssl/libcrypto.a"
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   fi
else
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     TOR_OPENSSL_LIBS="-lssl -lcrypto"
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fi
AC_SUBST(TOR_OPENSSL_LIBS)

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dnl Now check for particular openssl functions.
save_LIBS="$LIBS"
save_LDFLAGS="$LDFLAGS"
save_CPPFLAGS="$CPPFLAGS"
LIBS="$TOR_OPENSSL_LIBS $LIBS"
LDFLAGS="$TOR_LDFLAGS_openssl $LDFLAGS"
CPPFLAGS="$TOR_CPPFLAGS_openssl $CPPFLAGS"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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#include <openssl/opensslv.h>
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#if !defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER < 0x1000100fL
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#error "too old"
#endif
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   ]], [[]])],
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   [ : ],
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   [ AC_MSG_ERROR([OpenSSL is too old. We require 1.0.1 or later. You can specify a path to a newer one with --with-openssl-dir.]) ])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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#include <openssl/opensslv.h>
#include <openssl/evp.h>
#if defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_ECDSA)
#error "no ECC"
#endif
#if !defined(NID_X9_62_prime256v1) || !defined(NID_secp224r1)
#error "curves unavailable"
#endif
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   ]], [[]])],
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   [ : ],
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   [ AC_MSG_ERROR([OpenSSL is built without full ECC support, including curves P256 and P224. You can specify a path to one with ECC support with --with-openssl-dir.]) ])
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AC_CHECK_MEMBERS([struct ssl_method_st.get_cipher_by_char], , ,
[#include <openssl/ssl.h>
])

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AC_CHECK_FUNCS([ \
		SSL_SESSION_get_master_key \
		SSL_get_server_random \
                SSL_get_client_ciphers \
                SSL_get_client_random \
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		SSL_CIPHER_find \
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		TLS_method
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	       ])
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dnl Check if OpenSSL has scrypt implementation.
AC_CHECK_FUNCS([ EVP_PBE_scrypt ])

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dnl Check if OpenSSL structures are opaque
AC_CHECK_MEMBERS([SSL.state], , ,
[#include <openssl/ssl.h>
])

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dnl Define the set of checks for KIST scheduler support.
AC_DEFUN([CHECK_KIST_SUPPORT],[
  dnl KIST needs struct tcp_info and for certain members to exist.
  AC_CHECK_MEMBERS(
    [struct tcp_info.tcpi_unacked, struct tcp_info.tcpi_snd_mss],
    , ,[[#include <netinet/tcp.h>]])
  dnl KIST needs SIOCOUTQNSD to exist for an ioctl call.
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
                     #include <linux/sockios.h>
                     #ifndef SIOCOUTQNSD
                     #error
                     #endif
                     ])], have_siocoutqnsd=yes, have_siocoutqnsd=no)
  if test "x$have_siocoutqnsd" = "xyes"; then
    if test "x$ac_cv_member_struct_tcp_info_tcpi_unacked" = "xyes"; then
      if test "x$ac_cv_member_struct_tcp_info_tcpi_snd_mss" = "xyes"; then
        have_kist_support=yes
      fi
    fi
  fi
])
dnl Now, trigger the check.
CHECK_KIST_SUPPORT
AS_IF([test "x$have_kist_support" = "xyes"],
      [AC_DEFINE(HAVE_KIST_SUPPORT, 1, [Defined if KIST scheduler is supported
                                        on this system])],
      [AC_MSG_NOTICE([KIST scheduler can't be used. Missing support.])])

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LIBS="$save_LIBS"
LDFLAGS="$save_LDFLAGS"
CPPFLAGS="$save_CPPFLAGS"

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dnl ------------------------------------------------------
dnl Where do you live, zlib?  And how do we call you?

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tor_zlib_pkg_redhat="zlib"
tor_zlib_pkg_debian="zlib1g"
tor_zlib_devpkg_redhat="zlib-devel"
tor_zlib_devpkg_debian="zlib1g-dev"
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TOR_SEARCH_LIBRARY(zlib, $tryzlibdir, [-lz],
    [#include <zlib.h>],
    [const char * zlibVersion(void);],
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    [zlibVersion();], [--with-zlib-dir],
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    [/opt/zlib])

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if test "$enable_static_zlib" = "yes"; then
   if test "$tor_cv_library_zlib_dir" = "(system)"; then
     AC_MSG_ERROR("You must specify an explicit --with-zlib-dir=x option when
 using --enable-static-zlib")
   else
     TOR_ZLIB_LIBS="$TOR_LIBDIR_zlib/libz.a"
   fi
else
     TOR_ZLIB_LIBS="-lz"
fi
AC_SUBST(TOR_ZLIB_LIBS)

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dnl ------------------------------------------------------
dnl Where we do we find lzma?

AC_ARG_ENABLE(lzma,
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      AS_HELP_STRING(--enable-lzma, [enable support for the LZMA compression scheme.]),
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      [case "${enableval}" in
        "yes") lzma=true ;;
        "no")  lzma=false ;;
        * ) AC_MSG_ERROR(bad value for --enable-lzma) ;;
      esac], [lzma=auto])

if test "x$enable_lzma" = "xno"; then
    have_lzma=no;
else
    PKG_CHECK_MODULES([LZMA],
                      [liblzma],
                      have_lzma=yes,
                      have_lzma=no)

    if test "x$have_lzma" = "xno" ; then
        AC_MSG_WARN([Unable to find liblzma.])
    fi
fi

if test "x$have_lzma" = "xyes"; then
    AC_DEFINE(HAVE_LZMA,1,[Have LZMA])
    TOR_LZMA_CFLAGS="${LZMA_CFLAGS}"
    TOR_LZMA_LIBS="${LZMA_LIBS}"
fi
AC_SUBST(TOR_LZMA_CFLAGS)
AC_SUBST(TOR_LZMA_LIBS)

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dnl ------------------------------------------------------
dnl Where we do we find zstd?

AC_ARG_ENABLE(zstd,
      AS_HELP_STRING(--enable-zstd, [enable support for the Zstandard compression scheme.]),
      [case "${enableval}" in
        "yes") zstd=true ;;
        "no")  zstd=false ;;
        * ) AC_MSG_ERROR(bad value for --enable-zstd) ;;
      esac], [zstd=auto])

if test "x$enable_zstd" = "xno"; then
    have_zstd=no;
else
    PKG_CHECK_MODULES([ZSTD],
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                      [libzstd >= 1.1],
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                      have_zstd=yes,
                      have_zstd=no)

    if test "x$have_zstd" = "xno" ; then
        AC_MSG_WARN([Unable to find libzstd.])
    fi
fi

if test "x$have_zstd" = "xyes"; then
    AC_DEFINE(HAVE_ZSTD,1,[Have Zstd])
    TOR_ZSTD_CFLAGS="${ZSTD_CFLAGS}"
    TOR_ZSTD_LIBS="${ZSTD_LIBS}"
fi
AC_SUBST(TOR_ZSTD_CFLAGS)
AC_SUBST(TOR_ZSTD_LIBS)

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dnl ----------------------------------------------------------------------
dnl Check if libcap is available for capabilities.

tor_cap_pkg_debian="libcap2"
tor_cap_pkg_redhat="libcap"
tor_cap_devpkg_debian="libcap-dev"
tor_cap_devpkg_redhat="libcap-devel"

AC_CHECK_LIB([cap], [cap_init], [],
  AC_MSG_NOTICE([Libcap was not found. Capabilities will not be usable.])
)
AC_CHECK_FUNCS(cap_set_proc)

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dnl ---------------------------------------------------------------------
dnl Now that we know about our major libraries, we can check for compiler
dnl and linker hardening options.  We need to do this with the libraries known,
dnl since sometimes the linker will like an option but not be willing to
dnl use it with a build of a library.
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all_ldflags_for_check="$TOR_LDFLAGS_zlib $TOR_LDFLAGS_openssl $TOR_LDFLAGS_libevent"
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all_libs_for_check="$TOR_ZLIB_LIBS $TOR_LIB_MATH $TOR_LIBEVENT_LIBS $TOR_OPENSSL_LIBS $TOR_SYSTEMD_LIBS $TOR_LIB_WS32 $TOR_LIB_GDI $TOR_LIB_USERENV $TOR_CAP_LIBS"
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CFLAGS_FTRAPV=
CFLAGS_FWRAPV=
CFLAGS_ASAN=
CFLAGS_UBSAN=

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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !defined(__clang__)
#error
#endif])], have_clang=yes, have_clang=no)

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if test "x$enable_gcc_hardening" != "xno"; then
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    CFLAGS="$CFLAGS -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
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    if test "x$have_clang" = "xyes"; then
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        TOR_CHECK_CFLAGS(-Qunused-arguments)
    fi
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    TOR_CHECK_CFLAGS(-fstack-protector-all, also_link)
    AS_VAR_PUSHDEF([can_compile], [tor_cv_cflags_-fstack-protector-all])
    AS_VAR_PUSHDEF([can_link], [tor_can_link_-fstack-protector-all])
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m4_ifdef([AS_VAR_IF],[
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    AS_VAR_IF(can_compile, [yes],
        AS_VAR_IF(can_link, [yes],
                  [],
                  AC_MSG_ERROR([We tried to build with stack protection; it looks like your compiler supports it but your libc does not provide it. Are you missing libssp? (You can --disable-gcc-hardening to ignore this error.)]))
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        )])
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    AS_VAR_POPDEF([can_link])
    AS_VAR_POPDEF([can_compile])
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    TOR_CHECK_CFLAGS(-Wstack-protector)
    TOR_CHECK_CFLAGS(--param ssp-buffer-size=1)
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    if test "$bwin32" = "false" && test "$enable_libfuzzer" != "yes" && test "$enable_oss_fuzz" != "yes"; then
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       TOR_CHECK_CFLAGS(-fPIE)
       TOR_CHECK_LDFLAGS(-pie, "$all_ldflags_for_check", "$all_libs_for_check")
    fi
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if test "$fragile_hardening" = "yes"; then
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    TOR_TRY_COMPILE_WITH_CFLAGS(-ftrapv, also_link, CFLAGS_FTRAPV="-ftrapv", true)
   if test "$tor_cv_cflags__ftrapv" = "yes" && test "$tor_can_link__ftrapv" != "yes"; then
      AC_MSG_WARN([The compiler supports -ftrapv, but for some reason I was not able to link with -ftrapv. Are you missing run-time support? Run-time hardening will not work as well as it should.])
   fi

983
   if test "$tor_cv_cflags__ftrapv" != "yes"; then
984
     AC_MSG_ERROR([You requested fragile hardening, but the compiler does not seem to support -ftrapv.])
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   fi

   TOR_TRY_COMPILE_WITH_CFLAGS([-fsanitize=address], also_link, CFLAGS_ASAN="-fsanitize=address", true)
    if test "$tor_cv_cflags__fsanitize_address" = "yes" && test "$tor_can_link__fsanitize_address" != "yes"; then
      AC_MSG_ERROR([The compiler supports -fsanitize=address, but for some reason I was not able to link when using it. Are you missing run-time support? With GCC you need libubsan.so, and with Clang you need libclang_rt.ubsan*])
    fi

   TOR_TRY_COMPILE_WITH_CFLAGS([-fsanitize=undefined], also_link, CFLAGS_UBSAN="-fsanitize=undefined", true)
    if test "$tor_cv_cflags__fsanitize_address" = "yes" && test "$tor_can_link__fsanitize_address" != "yes"; then
      AC_MSG_ERROR([The compiler supports -fsanitize=undefined, but for some reason I was not able to link when using it. Are you missing run-time support? With GCC you need libasan.so, and with Clang you need libclang_rt.ubsan*])
    fi

TOR_CHECK_CFLAGS([-fno-omit-frame-pointer])
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fi

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CFLAGS_BUGTRAP="$CFLAGS_FTRAPV $CFLAGS_ASAN $CFLAGS_UBSAN"
CFLAGS_CONSTTIME="$CFLAGS_FWRAPV"

1003
mulodi_fixes_ftrapv=no
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if test "$have_clang" = "yes"; then
  saved_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS $CFLAGS_FTRAPV"
  AC_MSG_CHECKING([whether clang -ftrapv can link a 64-bit int multiply])
  AC_LINK_IFELSE([
      AC_LANG_SOURCE([[
          #include <stdint.h>
          #include <stdlib.h>
	  int main(int argc, char **argv)
	  {
            int64_t x = ((int64_t)atoi(argv[1])) * (int64_t)atoi(argv[2])
1015
	                * (int64_t)atoi(argv[3]);
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	    return x == 9;
	  } ]])],
	  [ftrapv_can_link=yes; AC_MSG_RESULT([yes])],
	  [ftrapv_can_link=no; AC_MSG_RESULT([no])])
  if test "$ftrapv_can_link" = "no"; then
    AC_MSG_CHECKING([whether defining __mulodi4 fixes that])
    AC_LINK_IFELSE([
      AC_LANG_SOURCE([[
          #include <stdint.h>
          #include <stdlib.h>
	  int64_t __mulodi4(int64_t a, int64_t b, int *overflow) {
             *overflow=0;
	     return a;
          }
	  int main(int argc, char **argv)
	  {
            int64_t x = ((int64_t)atoi(argv[1])) * (int64_t)atoi(argv[2])
1033
	                * (int64_t)atoi(argv[3]);
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	    return x == 9;
	  } ]])],
	  [mulodi_fixes_ftrapv=yes; AC_MSG_RESULT([yes])],
	  [mulodi_fixes_ftrapv=no; AC_MSG_RESULT([no])])
  fi
  CFLAGS="$saved_CFLAGS"
fi

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AM_CONDITIONAL(ADD_MULODI4, test "$mulodi_fixes_ftrapv" = "yes")

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dnl These cflags add bunches of branches, and we haven't been able to
dnl persuade ourselves that they're suitable for code that needs to be
dnl constant time.
AC_SUBST(CFLAGS_BUGTRAP)
dnl These cflags are variant ones sutable for code that needs to be
dnl constant-time.
AC_SUBST(CFLAGS_CONSTTIME)

1052
if test "x$enable_linker_hardening" != "xno"; then
1053
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    TOR_CHECK_LDFLAGS(-z relro -z now, "$all_ldflags_for_check", "$all_libs_for_check")
fi
1055

1056
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# For backtrace support
TOR_CHECK_LDFLAGS(-rdynamic)

1059
dnl ------------------------------------------------------
1060
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dnl Now see if we have a -fomit-frame-pointer compiler option.

saved_CFLAGS="$CFLAGS"
TOR_CHECK_CFLAGS(-fomit-frame-pointer)
1064
F_OMIT_FRAME_POINTER=''
1065
if test "$saved_CFLAGS" != "$CFLAGS"; then
1066
  if test "$fragile_hardening" = "yes"; then
1067
1068
    F_OMIT_FRAME_POINTER='-fomit-frame-pointer'
  fi
1069
1070
1071
1072
fi
CFLAGS="$saved_CFLAGS"
AC_SUBST(F_OMIT_FRAME_POINTER)

1073
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dnl ------------------------------------------------------
dnl If we are adding -fomit-frame-pointer (or if the compiler's doing it
dnl for us, as GCC 4.6 and later do at many optimization levels), then
dnl we should try to add -fasynchronous-unwind-tables so that our backtrace
dnl code will work.
TOR_CHECK_CFLAGS(-fasynchronous-unwind-tables)

1080
1081
1082
dnl ============================================================
dnl Check for libseccomp

1083
1084
1085
1086
if test "x$enable_seccomp" != "xno"; then
  AC_CHECK_HEADERS([seccomp.h])
  AC_SEARCH_LIBS(seccomp_init, [seccomp])
fi
1087

1088
1089
1090
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1093
dnl ============================================================
dnl Check for libscrypt

if test "x$enable_libscrypt" != "xno"; then
  AC_CHECK_HEADERS([libscrypt.h])
  AC_SEARCH_LIBS(libscrypt_scrypt, [scrypt])
1094
  AC_CHECK_FUNCS([libscrypt_scrypt])
1095
1096
fi

1097
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1100
1101
1102
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1104
1105
1106
dnl ============================================================
dnl We need an implementation of curve25519.

dnl set these defaults.
build_curve25519_donna=no
build_curve25519_donna_c64=no
use_curve25519_donna=no
use_curve25519_nacl=no
CURVE25519_LIBS=

1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
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1128
1129
1130
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1132
1133
1134
1135
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1155
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1162
1163
1164
1165
1166
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1169
1170
1171
1172
1173
1174
1175
dnl The best choice is using curve25519-donna-c64, but that requires
dnl that we
AC_CACHE_CHECK([whether we can use curve25519-donna-c64],
  tor_cv_can_use_curve25519_donna_c64,
  [AC_RUN_IFELSE(
    [AC_LANG_PROGRAM([dnl
      #include <stdint.h>
      typedef unsigned uint128_t __attribute__((mode(TI)));
  int func(uint64_t a, uint64_t b) {
           uint128_t c = ((uint128_t)a) * b;
           int ok = ((uint64_t)(c>>96)) == 522859 &&
             (((uint64_t)(c>>64))&0xffffffffL) == 3604448702L &&
                 (((uint64_t)(c>>32))&0xffffffffL) == 2351960064L &&
                 (((uint64_t)(c))&0xffffffffL) == 0;
           return ok;
      }
  ], [dnl
    int ok = func( ((uint64_t)2000000000) * 1000000000,
                   ((uint64_t)1234567890) << 24);
        return !ok;
      ])],
  [tor_cv_can_use_curve25519_donna_c64=yes],
      [tor_cv_can_use_curve25519_donna_c64=no],
  [AC_LINK_IFELSE(
        [AC_LANG_PROGRAM([dnl
      #include <stdint.h>
      typedef unsigned uint128_t __attribute__((mode(TI)));
  int func(uint64_t a, uint64_t b) {
           uint128_t c = ((uint128_t)a) * b;
           int ok = ((uint64_t)(c>>96)) == 522859 &&
             (((uint64_t)(c>>64))&0xffffffffL) == 3604448702L &&
                 (((uint64_t)(c>>32))&0xffffffffL) == 2351960064L &&
                 (((uint64_t)(c))&0xffffffffL) == 0;
           return ok;
      }
  ], [dnl
    int ok = func( ((uint64_t)2000000000) * 1000000000,
    	         ((uint64_t)1234567890) << 24);
        return !ok;
      ])],
          [tor_cv_can_use_curve25519_donna_c64=cross],
      [tor_cv_can_use_curve25519_donna_c64=no])])])

AC_CHECK_HEADERS([crypto_scalarmult_curve25519.h \
                  nacl/crypto_scalarmult_curve25519.h])

AC_CACHE_CHECK([for nacl compiled with a fast curve25519 implementation],
  tor_cv_can_use_curve25519_nacl,
  [tor_saved_LIBS="$LIBS"
   LIBS="$LIBS -lnacl"
   AC_LINK_IFELSE(
     [AC_LANG_PROGRAM([dnl
       #ifdef HAVE_CRYPTO_SCALARMULT_CURVE25519_H
       #include <crypto_scalarmult_curve25519.h>
   #elif defined(HAVE_NACL_CRYPTO_SCALARMULT_CURVE25519_H)
   #include <nacl/crypto_scalarmult_curve25519.h>
   #endif
       #ifdef crypto_scalarmult_curve25519_ref_BYTES
   #error Hey, this is the reference implementation! That's not fast.
   #endif
     ], [
   unsigned char *a, *b, *c; crypto_scalarmult_curve25519(a,b,c);
     ])], [tor_cv_can_use_curve25519_nacl=yes],
     [tor_cv_can_use_curve25519_nacl=no])
   LIBS="$tor_saved_LIBS" ])

 dnl Okay, now we need to figure out which one to actually use. Fall back
 dnl to curve25519-donna.c

1176
 if test "x$tor_cv_can_use_curve25519_donna_c64" != "xno"; then
1177
1178
   build_curve25519_donna_c64=yes
   use_curve25519_donna=yes
1179
 elif test "x$tor_cv_can_use_curve25519_nacl" = "xyes"; then
1180
1181
1182
1183
1184
1185
   use_curve25519_nacl=yes
   CURVE25519_LIBS=-lnacl
 else
   build_curve25519_donna=yes
   use_curve25519_donna=yes
 fi
1186

1187
if test "x$use_curve25519_donna" = "xyes"; then
1188
1189
1190
  AC_DEFINE(USE_CURVE25519_DONNA, 1,
            [Defined if we should use an internal curve25519_donna{,_c64} implementation])
fi
1191
if test "x$use_curve25519_nacl" = "xyes"; then
1192
1193
1194
  AC_DEFINE(USE_CURVE25519_NACL, 1,
            [Defined if we should use a curve25519 from nacl])
fi
1195
1196
1197
1198