#!/usr/bin/env python

import os
from waflib import Logs

VERSION="1.1.8"

def configure(conf):
    if conf.CHECK_RESOLV_WRAPPER():
        conf.DEFINE('USING_SYSTEM_RESOLV_WRAPPER', 1)
        libresolv_wrapper_so_path = 'libresolv_wrapper.so'
    else:

        if conf.CONFIG_SET("HAVE___THREAD"):
            conf.DEFINE("HAVE_GCC_THREAD_LOCAL_STORAGE", 1)

        # check HAVE_ATTRIBUTE_PRINTF_FORMAT
        conf.CHECK_CODE('''
            void log_fn(const char *format, ...) __attribute__ ((format (printf, 1, 2)));

            int main(void) {
                return 0;
            }
            ''',
            'HAVE_ATTRIBUTE_PRINTF_FORMAT',
            addmain=False,
            strict=True,
            msg='Checking for printf format validation support')

        conf.CHECK_HEADERS('resolv.h')

        conf.CHECK_STRUCTURE_MEMBER('struct __res_state',
                                    '_u._ext.nsaddrs',
                                    headers='sys/socket.h netinet/in.h resolv.h',
                                    define='HAVE_RES_STATE_U_EXT_NSADDRS')
        conf.CHECK_STRUCTURE_MEMBER('union res_sockaddr_union',
                                    'sin',
                                    headers='sys/socket.h netinet/in.h resolv.h',
                                    define='HAVE_RES_SOCKADDR_UNION_SIN')
        conf.CHECK_STRUCTURE_MEMBER('union res_sockaddr_union',
                                    'sin6',
                                    headers='sys/socket.h netinet/in.h resolv.h',
                                    define='HAVE_RES_SOCKADDR_UNION_SIN6')

        conf.CHECK_FUNCS_IN('res_ninit', 'resolv')
        if conf.CONFIG_SET('HAVE_RES_NINIT'):
            conf.DEFINE('HAVE_RES_NINIT_IN_LIBRESOLV', 1)

        conf.CHECK_FUNCS_IN('res_nclose', 'resolv')
        if conf.CONFIG_SET('HAVE_RES_NCLOSE'):
            conf.DEFINE('HAVE_RES_NCLOSE_IN_LIBRESOLV', 1)

        # If we find res_nquery in libc, we can't do resolv.conf redirect
        conf.CHECK_FUNCS('res_nquery __res_nquery')
        if (conf.CONFIG_SET('HAVE_RES_NQUERY')
                or conf.CONFIG_SET('HAVE___RES_NQUERY')):
            Logs.warn("Detection for resolv_wrapper: "
                      "Only dns faking will be available")
        else:
            if conf.CHECK_FUNCS('res_nquery', lib='resolv'):
                conf.DEFINE('HAVE_RESOLV_CONF_SUPPORT', 1)
            if conf.CHECK_FUNCS('__res_nquery', lib='resolv'):
                conf.DEFINE('HAVE_RESOLV_CONF_SUPPORT', 1)

        conf.CHECK_FUNCS_IN('res_init __res_init', 'resolv', checklibc=True)
        conf.CHECK_FUNCS_IN('res_ninit __res_ninit', 'resolv', checklibc=True)
        conf.CHECK_FUNCS_IN('res_close __res_close', 'resolv', checklibc=True)
        conf.CHECK_FUNCS_IN('res_nclose __res_nclose', 'resolv', checklibc=True)
        conf.CHECK_FUNCS_IN('res_query __res_query', 'resolv', checklibc=True)
        conf.CHECK_FUNCS_IN('res_nquery __res_nquery', 'resolv', checklibc=True)
        conf.CHECK_FUNCS_IN('res_search __res_search', 'resolv', checklibc=True)
        conf.CHECK_FUNCS_IN('res_nsearch __res_nsearch', 'resolv', checklibc=True)

        conf.CHECK_DECLS('ns_name_compress', headers='sys/types.h arpa/nameser.h')
        if (conf.CONFIG_SET("HAVE_DECL_NS_NAME_COMPRESS")):
            conf.DEFINE("HAVE_NS_NAME_COMPRESS", 1)

        # Create full path to resolv_wrapper
        blddir = os.path.realpath(conf.bldnode.abspath())
        libresolv_wrapper_so_path = blddir + '/default/third_party/resolv_wrapper/libresolv-wrapper.so'

    conf.DEFINE('LIBRESOLV_WRAPPER_SO_PATH', libresolv_wrapper_so_path)
    conf.DEFINE('RESOLV_WRAPPER', 1)

def build(bld):
    if bld.CONFIG_SET("HAVE_RESOLV_H") and not bld.CONFIG_SET("USING_SYSTEM_RESOLV_WRAPPER"):
        # We need to do it this way or the library wont work.
        # Using private_library=True will add symbol version which
        # breaks preloading!
        bld.SAMBA_LIBRARY('resolv_wrapper',
                          source='resolv_wrapper.c',
                          deps='dl resolv',
                          install=False,
                          realname='libresolv-wrapper.so')