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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) 2007-2019, The Tor Project, Inc.
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dnl See LICENSE for licensing information
5

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AC_PREREQ([2.63])
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AC_INIT([tor],[0.3.5.7-dev])
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AC_CONFIG_SRCDIR([src/app/main/tor_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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AC_ARG_ENABLE(openbsd-malloc,
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   AS_HELP_STRING(--enable-openbsd-malloc, [use malloc code from OpenBSD.  Linux only. Deprecated: see --with-malloc]))
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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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AC_ARG_ENABLE(restart-debugging,
   AS_HELP_STRING(--enable-restart-debugging, [Build Tor with support for debugging in-process restart. Developers only.]))
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AC_ARG_ENABLE(zstd-advanced-apis,
   AS_HELP_STRING(--disable-zstd-advanced-apis, [Build without support for zstd's "static-only" APIs.]))
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AC_ARG_ENABLE(nss,
   AS_HELP_STRING(--enable-nss, [Use Mozilla's NSS TLS library. (EXPERIMENTAL)]))
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AC_ARG_ENABLE(pic,
   AS_HELP_STRING(--enable-pic, [Build Tor's binaries as position-independent code, suitable to link as a library.]))
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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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AM_CONDITIONAL(USE_NSS, test "x$enable_nss" = "xyes")
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AM_CONDITIONAL(USE_OPENSSL, test "x$enable_nss" != "xyes")
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if test "x$enable_nss" = "xyes"; then
  AC_DEFINE(ENABLE_NSS, 1,
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  	    [Defined if we're building with NSS.])
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else
  AC_DEFINE(ENABLE_OPENSSL, 1,
            [Defined if we're building with OpenSSL or LibreSSL])
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fi
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if test "$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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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])

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if test "$enable_restart_debugging" = "yes"; then
  AC_DEFINE(ENABLE_RESTART_DEBUGGING, 1,
            [Defined if we're building with support for in-process restart debugging.])
fi
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if test "$enable_zstd_advanced_apis" != "no"; then
   AC_DEFINE(ENABLE_ZSTD_ADVANCED_APIS, 1,
             [Defined if we're going to try to use zstd's "static-only" APIs.])
fi
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# 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"
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  AC_DEFINE(DEBUG_SMARTLIST, 1, [Enable smartlist debugging])
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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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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 Enable Android only features.
AC_ARG_ENABLE(android,
     AS_HELP_STRING(--enable-android, [build with Android features enabled]))
AM_CONDITIONAL([USE_ANDROID], [test "x$enable_android" = "xyes"])

if test "x$enable_android" = "xyes"; then
  AC_DEFINE([USE_ANDROID], [1], [Compile with Android specific features enabled])

  dnl Check if the Android log library is available.
  AC_CHECK_HEADERS([android/log.h])
  AC_SEARCH_LIBS(__android_log_write, [log])

fi

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dnl ---
dnl Tor modules options. These options are namespaced with --disable-module-XXX
dnl ---

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dnl All our modules.
m4_define(MODULES, dirauth)

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dnl Directory Authority module.
AC_ARG_ENABLE([module-dirauth],
              AS_HELP_STRING([--disable-module-dirauth],
                             [Do not build tor with the dirauth module]),
              [], dnl Action if-given
              AC_DEFINE([HAVE_MODULE_DIRAUTH], [1],
                        [Compile with Directory Authority feature support]))
AM_CONDITIONAL(BUILD_MODULE_DIRAUTH, [test "x$enable_module_dirauth" != "xno"])

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dnl Helper variables.
TOR_MODULES_ALL_ENABLED=
AC_DEFUN([ADD_MODULE], [
    MODULE=m4_toupper($1)
    TOR_MODULES_ALL_ENABLED="${TOR_MODULES_ALL_ENABLED} -DHAVE_MODULE_${MODULE}=1"
])
m4_foreach_w([module], MODULES, [ADD_MODULE([module])])
AC_SUBST(TOR_MODULES_ALL_ENABLED)

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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, [ \
	python3 \
	python3.8 python3.7 python3.6 python3.5 python3.4 \
	python \
	python2 python2.7])
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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
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rust_crates=" \
    digest-0.7.2 \
    libc-0.2.39 \
"
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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(WIN32, test "x$bwin32" = "xtrue")
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AM_CONDITIONAL(BUILD_NT_SERVICES, test "x$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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AC_ARG_VAR([TOR_RUST_TARGET], [Rust target, must be specified when cross-compiling (HOST != BUILD). example: i686-pc-windows-gnu])

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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])
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  if test "x$enable_fatal_warnings" = "xyes"; then
    RUST_WARN=
  else
    RUST_WARN=#
  fi
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  if test "x$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])
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    AC_ARG_VAR([TOR_RUST_DEPENDENCIES], [path to directory with local crate mirror])
    if test "x$TOR_RUST_DEPENDENCIES" = "x"; then
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      TOR_RUST_DEPENDENCIES="${srcdir}/src/ext/rust/crates"
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    fi
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    dnl Check whether the path exists before we try to cd into it.
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    if test ! -d "$TOR_RUST_DEPENDENCIES"; then
      AC_MSG_ERROR([Rust dependency directory $TOR_RUST_DEPENDENCIES does not exist. Specify a dependency directory using the TOR_RUST_DEPENDENCIES variable or allow cargo to fetch crates using --enable-cargo-online-mode.])
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      ERRORED=1
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    fi
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    dnl Make the path absolute, since we'll be using it from within a
    dnl subdirectory.
    TOR_RUST_DEPENDENCIES=$(cd "$TOR_RUST_DEPENDENCIES" ; pwd)

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    for dep in $rust_crates; do
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      if test ! -d "$TOR_RUST_DEPENDENCIES"/"$dep"; then
        AC_MSG_ERROR([Failure to find rust dependency $TOR_RUST_DEPENDENCIES/$dep. Specify a dependency directory using the TOR_RUST_DEPENDENCIES variable or allow cargo to fetch crates using --enable-cargo-online-mode.])
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        ERRORED=1
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      fi
    done
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    if test "x$ERRORED" = "x"; then
      AC_MSG_RESULT([yes])
    fi
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  fi

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  dnl This is a workaround for #46797
  dnl (a.k.a https://github.com/rust-lang/rust/issues/46797 ).  Once the
  dnl upstream bug is fixed, we can remove this workaround.
  case "$host_os" in
      darwin*)
        TOR_RUST_EXTRA_LIBS="-lresolv"
	;;
  esac

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  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
  fi

  AC_CANONICAL_BUILD

  if test -n "$TOR_RUST_TARGET"; then
    if test "$host" = "$build"; then
      AC_MSG_ERROR([HOST = BUILD is invalid if TOR_RUST_TARGET is specified, see configure --help for more information.])
    fi
    RUST_TARGET_PROP="target = '$TOR_RUST_TARGET'"
    TOR_RUST_LIB_PATH="src/rust/target/$TOR_RUST_TARGET/release/$tor_rust_static_name"
  else
    if test "$host" != "$build"; then
      AC_MSG_ERROR([TOR_RUST_TARGET must be specified when cross-compiling with Rust enabled.])
    fi
    RUST_TARGET_PROP=
    TOR_RUST_LIB_PATH="src/rust/target/release/$tor_rust_static_name"
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  fi

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  AC_SUBST(RUST_TARGET_PROP)
  AC_SUBST(TOR_RUST_LIB_PATH)
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  AC_SUBST(CARGO_ONLINE)
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  AC_SUBST(RUST_WARN)
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  AC_SUBST(RUST_DL)

  dnl Let's check the rustc version, too
  AC_MSG_CHECKING([rust version])
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  RUSTC_VERSION=`$RUSTC --version`
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  RUSTC_VERSION_MAJOR=`$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 "$RUSTC_VERSION_MINOR" -lt 14; then
    AC_MSG_ERROR([rustc must be at least version 1.14])
  fi
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  AC_MSG_RESULT([$RUSTC_VERSION])
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fi

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AC_SUBST(TOR_RUST_EXTRA_LIBS)

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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" != "$saved_LIBS"; then
   # Looks like we need -lrt for clock_gettime().
   have_rt=yes
fi
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if test "$bwin32" = "false"; then
  AC_SEARCH_LIBS(pthread_create, [pthread])
  AC_SEARCH_LIBS(pthread_detach, [pthread])
fi
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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 \
	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 \
	get_current_dir_name \
	getaddrinfo \
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	getdelim \
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	getifaddrs \
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	getline \
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	getpass \
	getrlimit \
	gettimeofday \
	gmtime_r \
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	gnu_get_libc_version \
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	htonll \
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	inet_aton \
	ioctl \
	issetugid \
	llround \
	localtime_r \
	lround \
	memmem \
	memset_s \
	mmap \
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	pipe \
	pipe2 \
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	prctl \
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	readpassphrase \
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	rint \
	sigaction \
	socketpair \
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	statvfs \
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	strncasecmp \
	strcasecmp \
	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 some functions: they
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# forgot to decorate them with appropriate AVAILABLE_MAC_OS_VERSION
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# checks.

# We should only probe for these functions if we are sure that we
# are not targeting OS X 10.9 or earlier.
AC_MSG_CHECKING([for a pre-Yosemite OS X build target])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifdef __APPLE__
#  include <AvailabilityMacros.h>
#  ifndef MAC_OS_X_VERSION_10_10
#    define MAC_OS_X_VERSION_10_10 101000
#  endif
#  if defined(MAC_OS_X_VERSION_MIN_REQUIRED)
#    if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_10
#      error "Running on Mac OS X 10.9 or earlier"
#    endif
#  endif
#endif
]], [[]])],
   [on_macos_pre_10_10=no ; AC_MSG_RESULT([no])],
   [on_macos_pre_10_10=yes; AC_MSG_RESULT([yes])])

if test "$on_macos_pre_10_10" = "no"; then
  AC_CHECK_FUNCS(
        mach_approximate_time \
  )
fi

# We should only probe for these functions if we are sure that we
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# are not targeting OSX 10.11 or earlier.
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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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AC_MSG_CHECKING([whether free(NULL) works])
AC_RUN_IFELSE([AC_LANG_PROGRAM([
  #include <stdlib.h>
], [
char *p = NULL;
free(p);
])],
[free_null_ok=true; AC_MSG_RESULT(yes)],
[free_null_ok=false; AC_MSG_RESULT(no)],
[free_null_ok=cross; AC_MSG_RESULT(cross)])

if test "$free_null_ok" = "false"; then
   AC_MSG_ERROR([Your libc implementation doesn't allow free(NULL), as required by C99.])
fi

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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 $TOR_LIB_WS32], [
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#ifdef _WIN32
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#include <winsock2.h>
#endif
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#include <sys/time.h>
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#include <sys/types.h>
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#include <event2/event.h>], [
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#ifdef _WIN32
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#include <winsock2.h>
#endif
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struct event_base;
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struct event_base *event_base_new(void);
void event_base_free(struct event_base *);],
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    [
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#ifdef _WIN32
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{WSADATA d; WSAStartup(0x101,&d); }
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#endif
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event_base_free(event_base_new());
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], [--with-libevent-dir], [/opt/libevent])
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dnl Determine the incantation needed to link libevent.
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save_LIBS="$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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#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 ------------------------------------------------------
dnl Hello, NSS.  You're new around here.
if test "x$enable_nss" = "xyes"; then
  PKG_CHECK_MODULES(NSS,
     [nss],
     [have_nss=yes],
     [have_nss=no; AC_MSG_ERROR([You asked for NSS but I can't find it.])])
  AC_SUBST(NSS_CFLAGS)
  AC_SUBST(NSS_LIBS)
fi

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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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if test "x$enable_nss" != "xyes"; then

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tor_openssl_pkg_redhat="openssl"
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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 $TOR_LIB_WS32],
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    [#include <openssl/ssl.h>
     char *getenv(const char *);],
    [struct ssl_cipher_st;
     unsigned SSL_CIPHER_get_id(const struct ssl_cipher_st *);
     char *getenv(const char *);],
    dnl This funny-looking test program calls getenv, so that the compiler
    dnl will neither make code that call SSL_CIPHER_get_id(NULL) [producing
    dnl a crash], nor optimize out the call to SSL_CIPHER_get_id().
    dnl We look for SSL_cipher_get_id() because it is present in
    dnl OpenSSL >=1.0.1, because it is not deprecated, and because Tor
    dnl depends on it.
    [if (getenv("THIS_SHOULDNT_BE_SET_X201803")) SSL_CIPHER_get_id((void *)0);], [],
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    [/usr/local/opt/openssl /usr/local/openssl /usr/lib/openssl /usr/local/ssl /usr/lib/ssl /usr/local /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([ \
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		ERR_load_KDF_strings \
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		SSL_SESSION_get_master_key \
		SSL_get_server_random \
                SSL_get_client_ciphers \
                SSL_get_client_random \
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                SSL_CTX_set1_groups_list \
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		SSL_CIPHER_find \
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                SSL_CTX_set_security_level \
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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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AC_CHECK_SIZEOF(SHA_CTX, , [AC_INCLUDES_DEFAULT()
#include <openssl/sha.h>
])

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fi # enable_nss

dnl ======================================================================
dnl Can we use KIST?

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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.
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