#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

#######################
### Base configuration

# Configure autoconf
AC_PREREQ([2.69])

AC_INIT([lldpd],
        [m4_esyscmd_s([./get-version])],
        [https://github.com/lldpd/lldpd/issues],
        [lldpd],
        [https://lldpd.github.io/])

AC_CONFIG_SRCDIR([src/log.c])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([Makefile
                 src/Makefile
                 src/compat/Makefile
                 src/daemon/Makefile
                 src/lib/Makefile
                 src/client/Makefile
                 tests/Makefile
                 osx/Makefile])
AC_CONFIG_MACRO_DIR([m4])
AC_SUBST([CONFIGURE_ARGS], [$ac_configure_args])

# Configure automake
AM_INIT_AUTOMAKE([foreign subdir-objects -Wall -Werror tar-ustar])
AM_MAINTAINER_MODE
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES(yes)])

# Automake 1.12...
m4_pattern_allow([AM_PROG_AR])
AM_PROG_AR

# Configure libtool
LT_INIT
gl_LD_VERSION_SCRIPT

#######################
### Checks

# Checks for programs.
AC_PROG_CC
AC_PROG_CC_C99
if test x"$ac_cv_prog_cc_c99" = x"no"; then
  AC_MSG_FAILURE([*** C99 support is mandatory])
fi
AC_PROG_CPP
AM_PROG_CC_C_O
LT_INIT
AC_PROG_LN_S
AC_PROG_EGREP
AC_PROG_AWK
AC_PROG_SED

# Check for pkg-config
m4_ifndef([PKG_CHECK_MODULES], [
  AC_MSG_ERROR([PKG_CHECK_MODULES not found. Please install pkg-config and re-run autogen.sh])])

# Doxygen
DX_HTML_FEATURE(ON)
DX_DOT_FEATURE(OFF)
DX_CHM_FEATURE(OFF)
DX_CHI_FEATURE(OFF)
DX_MAN_FEATURE(OFF)
DX_RTF_FEATURE(OFF)
DX_XML_FEATURE(OFF)
DX_PDF_FEATURE(ON)
DX_PS_FEATURE(OFF)
DX_INIT_DOXYGEN([lldpd], [doxygen.cfg], [doxygen])

# Check some compiler flags
AX_CFLAGS_GCC_OPTION([-Wunknown-warning-option], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-fdiagnostics-show-option], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-fdiagnostics-color=auto], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-fno-omit-frame-pointer], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-funsigned-char], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-pipe], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wall], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-W], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wextra], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wformat], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wformat-security], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wimplicit-fallthrough], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wfatal-errors], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wheader-guard], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wdocumentation], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Winline], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wpointer-arith], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wmissing-prototypes], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wno-cast-align], [LLDP_CFLAGS]) dnl clang is bad at this
AX_CFLAGS_GCC_OPTION([-Wno-unused-parameter], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wno-missing-field-initializers], [LLDP_CFLAGS])
AX_CFLAGS_GCC_OPTION([-Wno-sign-compare], [LLDP_CFLAGS]) dnl Should be fixed later
AX_LDFLAGS_OPTION([-Wl,-z,relro], [LLDP_LDFLAGS])
AX_LDFLAGS_OPTION([-Wl,-z,now], [LLDP_LDFLAGS])

AC_C_TYPEOF

# Hardening
AC_ARG_ENABLE([hardening],
  [AS_HELP_STRING([--enable-hardening],
    [Enable compiler and linker options to frustrate memory corruption exploits @<:@default=yes@:>@])],
  [hardening="$enableval"],
  [hardening="yes"])
AC_ARG_ENABLE([pie],
  [AS_HELP_STRING([--enable-pie],
    [Enable PIE (position independant executable) @<:@default=no@:>@])],
  [pie="$enableval"],
  [pie="no"])

if test x"$hardening" != x"no"; then
  AX_CFLAGS_GCC_OPTION([-fstack-protector], [LLDP_CFLAGS])
  AX_CFLAGS_GCC_OPTION([-fstack-protector-all], [LLDP_CFLAGS])
  AX_CFLAGS_GCC_OPTION([-fstack-protector-strong], [LLDP_CFLAGS])
  AX_CFLAGS_GCC_OPTION([-fstack-protector-strong], [LLDP_CFLAGS])
  AX_CFLAGS_GCC_OPTION([-fstack-clash-protection], [LLDP_CFLAGS])
  AX_CFLAGS_GCC_OPTION([-D_FORTIFY_SOURCE=2], [LLDP_CPPFLAGS])
fi
if test x"$pie" = x"yes"; then
  AX_CFLAGS_GCC_OPTION([-fPIE], [LLDP_CFLAGS])
  AX_LDFLAGS_OPTION([-fPIE -pie], [LLDP_BIN_LDFLAGS],
    [AX_LDFLAGS_OPTION([-fPIE -Wl,-pie], [LLDP_BIN_LDFLAGS])])
fi

# Sanitizers
AC_ARG_ENABLE([sanitizers],
  AS_HELP_STRING([--enable-sanitizers],
    [Enable code instrumentation with selected sanitizers @<:@default=no@:>@]),
  [
case "$enableval" in
    no) sanitizers= ;;
    yes) sanitizers="-fsanitize=address,undefined" ;;
    *) sanitizers="-fsanitize=$enableval" ;;
esac
if test x"$sanitizers" != x; then
  LLDP_CFLAGS="$LLDP_CFLAGS $sanitizers"
  LLDP_LDFLAGS="$LLDP_LDFLAGS $sanitizers"
  AC_DEFINE([HAVE_ADDRESS_SANITIZER], 1, [Define if have both address and leak sanitizer])
elif test x"$hardening" != x"no"; then
  AX_LDFLAGS_OPTION([-fsanitize=safe-stack], [LLDP_BIN_LDFLAGS])
  if test x"$ax_cv_ld_check_flag__fsanitize_safe_stack" != x"no"; then
    AX_CFLAGS_GCC_OPTION([-fsanitize=safe-stack], [LLDP_CFLAGS])
  fi
fi
  ])

# Fuzzer
AC_ARG_ENABLE([fuzzer],
  AS_HELP_STRING([--enable-fuzzer],
    [Enable fuzzing @<:@default=no@:>@]),
  [
case "$enableval" in
    no) fuzzer= ;;
    yes) fuzzer="-fsanitize=fuzzer" ;;
    *) fuzzer="$enableval" ;;
esac
if test x"$fuzzer" != x; then
  AC_SUBST([FUZZ_DECODE_ENGINE], ["$fuzzer"])
  AX_CFLAGS_GCC_OPTION([-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION], [LLDP_CFLAGS])
fi
  ])

# Code coverage
AC_ARG_ENABLE([gcov],
  AS_HELP_STRING([--enable-gcov],
    [Enable coverage instrumentation @<:@default=no@:>@]),
    [gcov="$enableval"],
    [gcov="no"])
if test x"$gcov" != x"no"; then
  LLDP_CFLAGS="$LLDP_CFLAGS --coverage"
  LLDP_LDFLAGS="$LLDP_LDFLAGS --coverage"
fi

# OS
lldp_CHECK_OS
lldp_CFLAGS_OS

AC_CACHE_SAVE

# Checks for header files.
AC_HEADER_RESOLV
AC_CHECK_HEADERS([valgrind/valgrind.h])
lldp_CHECK_STDINT

AC_CACHE_SAVE

# Checks for typedefs, structures, and compiler characteristics.
lldp_CHECK___PROGNAME
lldp_CHECK_ALIGNOF

# Checks for library functions.
AC_CONFIG_LIBOBJ_DIR([src/compat])
AC_FUNC_MALLOC
AC_FUNC_REALLOC
AC_FUNC_FORK

# Some functions can be in libbsd
AC_ARG_WITH([libbsd],
  AS_HELP_STRING(
    [--with-libbsd],
    [Use libbsd @<:@default=auto@:>@]),
  [],
  [with_libbsd=auto])
if test x"$with_libbsd" != x"no"; then
  PKG_CHECK_MODULES([libbsd], [libbsd-overlay], [
    _save_CFLAGS="$CFLAGS"
    _save_LIBS="$LIBS"
    CFLAGS="$CFLAGS $libbsd_CFLAGS"
    LIBS="$LIBS $libbsd_LIBS"
    AC_MSG_CHECKING([if libbsd can be linked correctly])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
  @%:@include <sys/time.h>
  @%:@include <sys/types.h>
  ]], [[]])],[
        AC_MSG_RESULT(yes)
        LLDP_CFLAGS="$LLDP_CFLAGS $libbsd_CFLAGS"
        LLDP_LDFLAGS="$LLDP_LDFLAGS $libbsd_LIBS"
        with_libbsd=yes
      ],[
        AC_MSG_RESULT(no)
        CFLAGS="$_save_CFLAGS"
        LIBS="$_save_LIBS"
        if test x"$with_libbsd" = x"yes"; then
           AC_MSG_FAILURE([*** no libbsd support found])
        fi
        with_libbsd=no
      ])
  ], [
    if test x"$with_libbsd" = x"yes"; then
       AC_MSG_FAILURE([*** no libbsd support found])
    fi
    with_libbsd=no
  ])
fi

# setproctitle may have an _init function
AC_REPLACE_FUNCS([setproctitle])
AC_CHECK_FUNCS([setproctitle_init])
# Other functions
AC_REPLACE_FUNCS([strlcpy
                  strnlen
                  strndup
                  strtonum
                  getline
                  asprintf
                  vsyslog
                  daemon])
# Optional functions
AC_CHECK_FUNCS([setresuid setresgid])

# Check for res_init. On OSX, res_init is a symbol in libsystem_info
# and a macro in resolv.h. We need to ensure we test with resolv.h.
m4_pushdef([AC_LANG_CALL(C)], [
  AC_LANG_PROGRAM([$1
@%:@include <resolv.h>], [return $2 ();])])
AC_SEARCH_LIBS([res_init], resolv bind,
               AC_DEFINE([HAVE_RES_INIT], 1,
               [Define to indicate that res_init() exists]))
m4_popdef([AC_LANG_CALL(C)])

AC_CACHE_SAVE

## Unit tests wich check
PKG_CHECK_MODULES([check], [check >= 0.9.4], [have_check=yes], [have_check=no])

# Third-party libraries
lldp_CHECK_LIBEVENT
lldp_CHECK_LIBCAP

# Compatibility with pkg.m4 < 0.27
m4_ifdef([PKG_INSTALLDIR], [PKG_INSTALLDIR],
         [AC_ARG_WITH([pkgconfigdir],
                      [AS_HELP_STRING([--with-pkgconfigdir],
                      [install directory for *.pc pkg-config file])],
                      [],[with_pkgconfigdir='$(libdir)/pkgconfig'])
          AC_SUBST([pkgconfigdir], [${with_pkgconfigdir}])])

#######################
### Options

# Readline
AC_ARG_WITH([readline],
  AS_HELP_STRING(
    [--with-readline],
    [Enable the use of readline-like library @<:@default=auto@:>@]),
  [],
  [with_readline=auto])
if test x"$with_readline" != x"no"; then
   AX_LIB_READLINE_LLDPD
   if test x"$with_readline" != x"check" -a x"$with_readline" != x"auto"; then
     if test x"$ax_cv_lib_readline" = x"no"; then
       AC_MSG_FAILURE([*** no readline support found])
     fi
   fi
else
   ax_cv_lib_readline="no"
fi

# SNMP
AC_ARG_WITH([snmp],
  AS_HELP_STRING(
    [--with-snmp],
    [Enable the use of SNMP @<:@default=no@:>@]),
  [],
  [with_snmp=no])
lldp_CHECK_SNMP

# XML
AC_ARG_WITH([xml],
  AS_HELP_STRING(
    [--with-xml],
    [Enable XML output via libxml2 @<:@default=auto@:>@]),
  [],
  [with_xml=auto])
lldp_CHECK_XML2

# JSON (built-in)
lldp_ARG_ENABLE([json0], [use of pre-0.9.2 JSON/json-c format], [no])

# Seccomp
AC_ARG_WITH([seccomp],
  AS_HELP_STRING(
    [--with-seccomp],
    [Enable seccomp support (with libseccomp, experimental) @<:@default=no@:>@]),
  [],
  [with_seccomp=no])
lldp_CHECK_SECCOMP

# OS X launchd support
lldp_ARG_WITH([launchddaemonsdir], [Directory for launchd configuration file (OSX)],
                                   [/Library/LaunchDaemons])
AC_SUBST([launchddaemonsdir], [$with_launchddaemonsdir])
AM_CONDITIONAL(HAVE_LAUNCHDDAEMONSDIR,
    [test -n "$with_launchddaemonsdir" -a "x$with_launchddaemonsdir" != xno ])

# Systemd
lldp_ARG_WITH([systemdsystemunitdir], [Directory for systemd service files],
              [$($PKG_CONFIG --variable=systemdsystemunitdir systemd 2> /dev/null)])
AC_SUBST([systemdsystemunitdir], [$with_systemdsystemunitdir])
AM_CONDITIONAL(HAVE_SYSTEMDSYSTEMUNITDIR,
    [test -n "$with_systemdsystemunitdir" -a "x$with_systemdsystemunitdir" != xno ])

# sysusers
lldp_ARG_WITH([sysusersdir], [Directory for sysusers files],
              [$($PKG_CONFIG --variable=sysusersdir systemd 2> /dev/null)])
AC_SUBST([sysusersdir], [$with_sysusersdir])
AM_CONDITIONAL(HAVE_SYSUSERSDIR,
    [test -n "$with_sysusersdir" -a "x$with_sysusersdir" != xno ])

# AppArmor
lldp_ARG_WITH([apparmordir], [Directory for AppArmor profiles (Linux)],
                             [no])
AC_SUBST([apparmordir], [$with_apparmordir])
AM_CONDITIONAL(HAVE_APPARMORDIR,
    [test -n "$with_apparmordir" -a "x$with_apparmordir" != xno ])

# Systemtap/DTrace
lldp_SYSTEMTAP

# Privsep settings
lldp_ARG_ENABLE([privsep], [Privilege separation], [yes])
lldp_ARG_WITH([privsep-user], [Which user to use for privilege separation], [_lldpd])
lldp_ARG_WITH([privsep-group], [Which group to use for privilege separation], [_lldpd])

# Directories
dnl On autoconf 2.69 and before, runstatedir is not configurable, let be able to use it anyway
if test "x$runstatedir" = x; then
    AC_SUBST([runstatedir], ['${localstatedir}/run'])
fi
lldp_ARG_WITH([privsep-chroot], [Which directory to use to chroot lldpd], [${runstatedir}/lldpd])
lldp_ARG_WITH([lldpd-ctl-socket], [Path to socket for communication with lldpd], [${runstatedir}/lldpd.socket])
lldp_ARG_WITH([lldpd-pid-file], [Path to lldpd PID file], [${runstatedir}/lldpd.pid])

# Netlink
lldp_ARG_WITH_UNQUOTED([netlink-max-receive-bufsize], [Netlink maximum receive buffer size], [1024*1024])
lldp_ARG_WITH_UNQUOTED([netlink-receive-bufsize], [Netlink initial receive buffer size], [0])
lldp_ARG_WITH_UNQUOTED([netlink-send-bufsize], [Netlink send buffer size], [0])

# CDP/FDP/EDP/SONMP
lldp_ARG_ENABLE([cdp], [Cisco Discovery Protocol], [yes])
lldp_ARG_ENABLE([fdp], [Foundry Discovery Protocol], [yes])
lldp_ARG_ENABLE([edp], [Extreme Discovery Protocol], [yes])
lldp_ARG_ENABLE([sonmp], [SynOptics Network Management Protocol], [yes])

# LLDPMED/Dot1/Dot3
lldp_ARG_ENABLE([lldpmed], [LLDP-MED extension], [yes])
lldp_ARG_ENABLE([dot1], [Dot1 extension (VLAN stuff)], [yes])
lldp_ARG_ENABLE([dot3], [Dot3 extension (PHY stuff)], [yes])
lldp_ARG_ENABLE([custom], [Custom TLV support], [yes])

# Oldies
MIN_LINUX_KERNEL_VERSION=2.6.39
lldp_ARG_ENABLE([oldies], [compatibility with Linux kernel older than 2.6.39], [no])
if test x"$os" = x"Linux"; then
    if test x"$enable_oldies" = x"no"; then
      AC_DEFINE_UNQUOTED(MIN_LINUX_KERNEL_VERSION, "[$MIN_LINUX_KERNEL_VERSION]", [Minimal Linux kernel version required])
    else
      AC_DEFINE(MIN_LINUX_KERNEL_VERSION, "2.6.11", [Minimal kernel version required])
    fi
fi

AX_BUILD_DATE_EPOCH(BUILD_DATE, "%FT%TZ", [BUILD_DATE="(unknown)"])
AC_DEFINE_UNQUOTED(BUILD_DATE, "[$BUILD_DATE]", [Build date and time])

dnl per reproducible-builds.org check SOURCE_DATE_EPOCH
dnl
if test -z "${SOURCE_DATE_EPOCH+set}" ; then
AC_DEFINE_UNQUOTED(LLDP_CC, "[$CC $LLDP_CFLAGS $LLDP_CPPFLAGS $CFLAGS $CPPFLAGS]", [C compiler command])
AC_DEFINE_UNQUOTED(LLDP_LD, "[$LD $LLDP_LDFLAGS $LLDP_BIN_LDFLAGS $LDFLAGS $LIBS]", [Linker compiler command])
else
AC_DEFINE_UNQUOTED(LLDP_CC, "[C compiler command is not available for reproducible builds]", [C compiler command])
AC_DEFINE_UNQUOTED(LLDP_LD, "[Linker compiler command is not available for reproducible builds]", [Linker compiler command])
fi

#######################
# Output results
AC_SUBST([LLDP_CFLAGS])
AC_SUBST([LLDP_CPPFLAGS])
AC_SUBST([LLDP_LDFLAGS])
AC_SUBST([LLDP_BIN_LDFLAGS])
AM_CONDITIONAL([ENABLE_FUZZ_DECODE], [test x"$fuzzer" != x])
AM_CONDITIONAL([HAVE_CHECK], [test x"$have_check" = x"yes"])
AM_CONDITIONAL([USE_SNMP], [test x"$with_snmp" = x"yes"])
AM_CONDITIONAL([USE_XML], [test x"$with_xml" = x"yes"])
AM_CONDITIONAL([USE_SECCOMP], [test x"$with_seccomp" = x"yes"])
dnl If old default of AR_FLAGS is otherwise being used (because of older automake),
dnl replace it with one without 'u'
if test "x$AR_FLAGS" = "xcru" ; then
  AR_FLAGS="cr"
fi
AC_OUTPUT

if test x"$LIBEVENT_EMBEDDED" = x; then
   libevent=system
else
   libevent=embedded
fi

cat <<EOF

------------------ Summary ------------------
 $PACKAGE_NAME version $PACKAGE_VERSION
  OS.............: $os
  Prefix.........: $prefix
  C Compiler.....: $CC $LLDP_CFLAGS $LLDP_CPPFLAGS $CFLAGS $CPPFLAGS
  Linker.........: $LD $LLDP_LDFLAGS $LLDP_BIN_LDFLAGS $LDFLAGS $LIBS
  Libevent.......: $libevent
  Readline.......: ${ax_cv_lib_readline}

 Optional features:
  SNMP support...: ${with_snmp-no}
  CDP............: $enable_cdp
  FDP............: $enable_fdp
  EDP............: $enable_edp
  SONMP..........: $enable_sonmp
  LLDPMED........: $enable_lldpmed
  DOT1...........: $enable_dot1
  DOT3...........: $enable_dot3
  CUSTOM.........: $enable_custom
  XML output.....: ${with_xml-no}
  Oldies support.: $enable_oldies
  seccomp........: ${with_seccomp-no}
  libbsd.........: ${with_libbsd-no}

 Privilege separation:
  Enabled........: $enable_privsep
  User/group.....: ${with_privsep_user}/${with_privsep_group}
  Chroot.........: ${with_privsep_chroot}

 Instrumentation (for devs only):
  Sanitizers.....: ${sanitizers:-none}
  Coverage.......: ${gcov}
------------- Compiler version --------------
$($CC --version || true)
-------------- Linker version ---------------
$($LD --version || true)
---------------------------------------------

Check the above options and compile with:
 ${MAKE-make}

EOF
