import Logs, Options, sys

# Check for kerberos
have_gssapi=False

def krb5_define_syslib(conf, lib, deps):
    found = 'FOUND_SYSTEMLIB_' + lib
    if found in conf.env:
        return
    conf.SET_TARGET_TYPE(lib, 'SYSLIB')
    conf.SET_SYSLIB_DEPS(lib, deps)
    conf.env[found] = True

Logs.info("Looking for kerberos features")
conf.find_program('krb5-config.heimdal', var='HEIMDAL_KRB5_CONFIG')

if isinstance(Options.options.with_system_mitkrb5, list):
    path_krb5_config = [x+'/bin' for x in Options.options.with_system_mitkrb5]
else:
    path_krb5_config = None

conf.find_program('krb5-config', path_list=path_krb5_config, var='KRB5_CONFIG')
if conf.env.KRB5_CONFIG:
    conf.check_cfg(path=conf.env.KRB5_CONFIG, args="--cflags --libs",
               package="", uselib_store="KRB5")
    krb5_define_syslib(conf, "krb5", conf.env['LIB_KRB5'])

    conf.check_cfg(path=conf.env.KRB5_CONFIG, args="--cflags --libs",
               package="gssapi", uselib_store="GSSAPI")
    krb5_define_syslib(conf, "gssapi", conf.env['LIB_GSSAPI'])
    if 'gssapi_krb5' in conf.env['LIB_GSSAPI']:
        krb5_define_syslib(conf, "gssapi_krb5", conf.env['LIB_GSSAPI'])

    vendor = conf.cmd_and_log("%(path)s --vendor" % dict(path=conf.env.KRB5_CONFIG), dict())
    conf.env.KRB5_VENDOR = vendor.strip().lower()
    if conf.env.KRB5_VENDOR != 'heimdal':
        conf.define('USING_SYSTEM_KRB5', 1)
        del conf.env.HEIMDAL_KRB5_CONFIG
        kversion = conf.cmd_and_log("%(path)s --version" % dict(path=conf.env.KRB5_CONFIG), dict()).strip()
        kversion_split = kversion.split(' ')[-1].split('.')
        # drop '-prerelease' suffix
        if kversion_split[-1].find('-') > 0:
            last_digit = kversion_split[-1].split('-')[0]
            kversion_split[-1] = last_digit
        kversion_check = map(int, kversion_split)
        if kversion_check < [1, 9]:
            Logs.error('ERROR: MIT krb5 build requires at least 1.9.0. %s is found and cannot be used' % (kversion))
            Logs.error('ERROR: You may try to build with embedded Heimdal Kerebros by not specifying --with-system-mitkrb5')
            sys.exit(1)
        else:
            Logs.info('%s is detected, MIT krb5 build can proceed' % (kversion))

conf.check_cfg(args="--cflags --libs", package="com_err", uselib_store="com_err")
conf.CHECK_FUNCS_IN('_et_list', 'com_err')
conf.CHECK_HEADERS('com_err.h', lib='com_err')

conf.CHECK_HEADERS('krb5.h krb5/locate_plugin.h', lib='krb5')
conf.CHECK_HEADERS('gssapi.h gssapi/gssapi_generic.h gssapi/gssapi.h gssapi/gssapi_ext.h gssapi/gssapi_krb5.h', lib='gssapi')

conf.CHECK_FUNCS_IN('krb5_encrypt_data', 'k5crypto')
conf.CHECK_FUNCS_IN('des_set_key','crypto')
conf.CHECK_FUNCS_IN('copy_Authenticator', 'asn1')
conf.CHECK_FUNCS_IN('roken_getaddrinfo_hostspec', 'roken')

conf.CHECK_HEADERS('profile.h')

if conf.CHECK_FUNCS_IN('gss_display_status', 'gssapi gssapi_krb5'):
    have_gssapi=True

if not have_gssapi:
    if conf.env.KRB5_CONFIG and conf.env.KRB5_CONFIG != 'heimdal':
        Logs.error("ERROR: WAF build with MIT Krb5 requires working GSSAPI implementation")
        sys.exit(1)

conf.CHECK_FUNCS_IN('''
       gss_wrap_iov
       gss_krb5_import_cred
       gss_get_name_attribute
       gss_mech_krb5
       gss_oid_equal
       gss_inquire_sec_context_by_oid
       gsskrb5_extract_authz_data_from_sec_context
       gss_krb5_export_lucid_sec_context
       gss_import_cred gss_export_cred
       ''', 'gssapi gssapi_krb5')
conf.CHECK_FUNCS_IN('krb5_mk_req_extended krb5_kt_compare', 'krb5')
conf.CHECK_FUNCS('''
       krb5_set_default_in_tkt_etypes krb5_set_default_tgs_enctypes
       krb5_set_default_tgs_ktypes krb5_principal2salt
       krb5_c_string_to_key krb5_get_pw_salt krb5_string_to_key_salt krb5_auth_con_setkey
       krb5_auth_con_setuseruserkey krb5_get_permitted_enctypes
       krb5_get_default_in_tkt_etypes krb5_free_data_contents
       krb5_principal_get_comp_string krb5_free_unparsed_name
       krb5_free_keytab_entry_contents krb5_kt_free_entry krb5_krbhst_init
       krb5_krbhst_get_addrinfo
       krb5_crypto_init krb5_crypto_destroy
       krb5_c_verify_checksum krb5_principal_compare_any_realm
       krb5_parse_name_norealm krb5_princ_size krb5_get_init_creds_opt_set_pac_request
       krb5_get_renewed_creds krb5_free_error_contents
       initialize_krb5_error_table krb5_get_init_creds_opt_alloc
       krb5_get_init_creds_opt_free krb5_get_init_creds_opt_get_error
       krb5_enctype_to_string krb5_fwd_tgt_creds krb5_auth_con_set_req_cksumtype
       krb5_get_creds_opt_alloc krb5_get_creds_opt_set_impersonate krb5_get_creds
       krb5_get_credentials_for_user krb5_get_host_realm krb5_free_host_realm
       krb5_get_init_creds_keyblock krb5_get_init_creds_keytab
       krb5_make_principal krb5_build_principal_alloc_va
       krb5_cc_get_lifetime krb5_cc_retrieve_cred
       krb5_free_checksum_contents krb5_c_make_checksum krb5_create_checksum
       krb5_config_get_bool_default krb5_get_profile
       krb5_data_copy
       krb5_keyblock_init krb5_principal_set_realm krb5_principal_get_type
       krb5_warnx
       ''',
     lib='krb5 k5crypto')
conf.CHECK_DECLS('''krb5_get_credentials_for_user
                    krb5_auth_con_set_req_cksumtype''',
                    headers='krb5.h', always=True)
conf.CHECK_VARIABLE('AP_OPTS_USE_SUBKEY', headers='krb5.h')
conf.CHECK_VARIABLE('KV5M_KEYTAB', headers='krb5.h')
conf.CHECK_VARIABLE('KRB5_KU_OTHER_CKSUM', headers='krb5.h')
conf.CHECK_VARIABLE('KRB5_KEYUSAGE_APP_DATA_CKSUM', headers='krb5.h')
conf.CHECK_VARIABLE('ENCTYPE_AES128_CTS_HMAC_SHA1_96', headers='krb5.h')
conf.CHECK_VARIABLE('ENCTYPE_AES256_CTS_HMAC_SHA1_96', headers='krb5.h')
conf.CHECK_DECLS('KRB5_PDU_NONE', reverse=True, headers='krb5.h')
conf.CHECK_STRUCTURE_MEMBER('krb5_keytab_entry', 'key', headers='krb5.h',
                            define='HAVE_KRB5_KEYTAB_ENTRY_KEY')
conf.CHECK_STRUCTURE_MEMBER('krb5_keytab_entry', 'keyblock', headers='krb5.h',
                            define='HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK')
conf.CHECK_STRUCTURE_MEMBER('krb5_address', 'magic', headers='krb5.h',
                            define='HAVE_MAGIC_IN_KRB5_ADDRESS')
conf.CHECK_STRUCTURE_MEMBER('krb5_address', 'addrtype', headers='krb5.h',
                            define='HAVE_ADDRTYPE_IN_KRB5_ADDRESS')
conf.CHECK_STRUCTURE_MEMBER('krb5_ap_req', 'ticket', headers='krb5.h',
                            define='HAVE_TICKET_POINTER_IN_KRB5_AP_REQ')

conf.CHECK_TYPE('krb5_encrypt_block', headers='krb5.h')

conf.CHECK_CODE('''
       krb5_context ctx;
       krb5_get_init_creds_opt *opt = NULL;
       krb5_get_init_creds_opt_free(ctx, opt);
       ''',
    'KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT',
    headers='krb5.h', link=False,
    msg="Checking whether krb5_get_init_creds_opt_free takes a context argument")
conf.CHECK_CODE('''
       const krb5_data *pkdata;
       krb5_context context;
       krb5_principal principal;
       pkdata = krb5_princ_component(context, principal, 0);
       ''',
    'HAVE_KRB5_PRINC_COMPONENT',
    headers='krb5.h', lib='krb5',
    msg="Checking whether krb5_princ_component is available")

conf.CHECK_CODE('''
       int main(void) {
       char buf[256];
       krb5_enctype_to_string(1, buf, 256);
       return 0;
       }''',
    'HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG',
    headers='krb5.h', lib='krb5 k5crypto',
    addmain=False, cflags=conf.env['WERROR_CFLAGS'],
    msg="Checking whether krb5_enctype_to_string takes size_t argument")

conf.CHECK_CODE('''
       int main(void) {
       krb5_context context = NULL;
       char *str = NULL;
       krb5_enctype_to_string(context, 1, &str);
       if (str) free (str);
       return 0;
       }''',
    'HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG',
    headers='krb5.h stdlib.h', lib='krb5',
    addmain=False, cflags=conf.env['WERROR_CFLAGS'],
    msg="Checking whether krb5_enctype_to_string takes krb5_context argument")
conf.CHECK_CODE('''
       int main(void) {
       krb5_context ctx = NULL;
       krb5_principal princ = NULL;
       const char *str = krb5_princ_realm(ctx, princ)->data;
       return 0;
       }''',
    'HAVE_KRB5_PRINC_REALM',
    headers='krb5.h', lib='krb5',
    addmain=False,
    msg="Checking whether the macro krb5_princ_realm is defined")
conf.CHECK_CODE('''
       int main(void) {
           krb5_context context;
           krb5_principal principal;
           const char *realm; realm = krb5_principal_get_realm(context, principal);
           return 0;
       }''',
    'HAVE_KRB5_PRINCIPAL_GET_REALM',
    headers='krb5.h', lib='krb5',
    addmain=False,
    msg="Checking whether krb5_principal_get_realm is defined")
conf.CHECK_CODE('''
       krb5_enctype enctype;
       enctype = ENCTYPE_ARCFOUR_HMAC_MD5;
       ''',
    '_HAVE_ENCTYPE_ARCFOUR_HMAC_MD5',
    headers='krb5.h', lib='krb5',
    msg="Checking whether the ENCTYPE_ARCFOUR_HMAC_MD5 key type definition is available");
conf.CHECK_CODE('''
       krb5_enctype enctype;
       enctype = ENCTYPE_ARCFOUR_HMAC_MD5_56;
       ''',
    '_HAVE_ENCTYPE_ARCFOUR_HMAC_MD5_56',
    headers='krb5.h', lib='krb5',
    msg="Checking whether the ENCTYPE_ARCFOUR_HMAC_MD5_56 key type definition is available");
conf.CHECK_CODE('''
       krb5_keytype keytype;
       keytype = KEYTYPE_ARCFOUR_56;
       ''',
    '_HAVE_KEYTYPE_ARCFOUR_56',
    headers='krb5.h', lib='krb5',
    msg="Checking whether the HAVE_KEYTYPE_ARCFOUR_56 key type definition is available");
if conf.CONFIG_SET('_HAVE_ENCTYPE_ARCFOUR_HMAC_MD5') and conf.CONFIG_SET('_HAVE_KEYTYPE_ARCFOUR_56'):
    conf.DEFINE('HAVE_ENCTYPE_ARCFOUR_HMAC_MD5', '1')
if conf.CONFIG_SET('_HAVE_ENCTYPE_ARCFOUR_HMAC_MD5_56') and conf.CONFIG_SET('_HAVE_KEYTYPE_ARCFOUR_56'):
    conf.DEFINE('HAVE_ENCTYPE_ARCFOUR_HMAC_MD5_56', '1')

conf.CHECK_CODE('''
       krb5_enctype enctype;
       enctype = ENCTYPE_ARCFOUR_HMAC;
       ''',
    'HAVE_ENCTYPE_ARCFOUR_HMAC',
    headers='krb5.h', lib='krb5',
    msg="Checking whether the ENCTYPE_ARCFOUR_HMAC key type definition is available");
conf.CHECK_CODE('''
       krb5_enctype enctype;
       enctype = ENCTYPE_ARCFOUR_HMAC_EXP;
       ''',
    'HAVE_ENCTYPE_ARCFOUR_HMAC_EXP',
    headers='krb5.h', lib='krb5',
    msg="Checking whether the ENCTYPE_ARCFOUR_HMAC_EXP key type definition is available");

conf.CHECK_CODE('''
       krb5_context context;
       krb5_keytab keytab;
       krb5_init_context(&context);
       return krb5_kt_resolve(context, "WRFILE:api", &keytab);
       ''',
    'HAVE_WRFILE_KEYTAB',
    headers='krb5.h', lib='krb5', execute=True,
    msg="Checking whether the WRFILE:-keytab is supported");
# Check for KRB5_DEPRECATED handling
conf.CHECK_CODE('''#define KRB5_DEPRECATED 1
       #include <krb5.h>''',
   'HAVE_KRB5_DEPRECATED_WITH_IDENTIFIER', addmain=False,
    link=False,
    msg="Checking for KRB5_DEPRECATED define taking an identifier")

conf.CHECK_CODE('''
       krb5_creds creds;
       creds.flags.b.initial = 0;
       ''',
    'HAVE_FLAGS_IN_KRB5_CREDS',
    headers='krb5.h', lib='krb5', execute=False,
    msg="Checking whether krb5_creds have flags property")