import re
import socket
import platform
import sshuttle.helpers as helpers
import sshuttle.client as client
import sshuttle.firewall as firewall
import sshuttle.hostwatch as hostwatch
import sshuttle.ssyslog as ssyslog
from sshuttle.options import parser, parse_ipport
from sshuttle.helpers import family_ip_tuple, log, Fatal
from sshuttle.sudoers import sudoers


def main():
    opt = parser.parse_args()

    if opt.sudoers or opt.sudoers_no_modify:
        if platform.platform().startswith('OpenBSD'):
            log('Automatic sudoers does not work on BSD')
            exit(1)

        if not opt.sudoers_filename:
            log('--sudoers-file must be set or omited.')
            exit(1)

        sudoers(
            user_name=opt.sudoers_user,
            no_modify=opt.sudoers_no_modify,
            file_name=opt.sudoers_filename
        )

    if opt.daemon:
        opt.syslog = 1
    if opt.wrap:
        import sshuttle.ssnet as ssnet
        ssnet.MAX_CHANNEL = opt.wrap
    if opt.latency_buffer_size:
        import sshuttle.ssnet as ssnet
        ssnet.LATENCY_BUFFER_SIZE = opt.latency_buffer_size
    helpers.verbose = opt.verbose

    try:
        if opt.firewall:
            if opt.subnets or opt.subnets_file:
                parser.error('exactly zero arguments expected')
            return firewall.main(opt.method, opt.syslog)
        elif opt.hostwatch:
            return hostwatch.hw_main(opt.subnets, opt.auto_hosts)
        else:
            includes = opt.subnets + opt.subnets_file
            excludes = opt.exclude
            if not includes and not opt.auto_nets:
                parser.error('at least one subnet, subnet file, '
                             'or -N expected')
            remotename = opt.remote
            if remotename == '' or remotename == '-':
                remotename = None
            nslist = [family_ip_tuple(ns) for ns in opt.ns_hosts]
            if opt.seed_hosts:
                sh = re.split(r'[\s,]+', (opt.seed_hosts or "").strip())
            elif opt.auto_hosts:
                sh = []
            else:
                sh = None
            if opt.listen:
                ipport_v6 = None
                ipport_v4 = None
                lst = opt.listen.split(",")
                for ip in lst:
                    family, ip, port = parse_ipport(ip)
                    if family == socket.AF_INET6:
                        ipport_v6 = (ip, port)
                    else:
                        ipport_v4 = (ip, port)
            else:
                # parse_ipport4('127.0.0.1:0')
                ipport_v4 = "auto"
                # parse_ipport6('[::1]:0')
                ipport_v6 = "auto" if not opt.disable_ipv6 else None
            if opt.syslog:
                ssyslog.start_syslog()
                ssyslog.close_stdin()
                ssyslog.stdout_to_syslog()
                ssyslog.stderr_to_syslog()
            return_code = client.main(ipport_v6, ipport_v4,
                                      opt.ssh_cmd,
                                      remotename,
                                      opt.python,
                                      opt.latency_control,
                                      opt.dns,
                                      nslist,
                                      opt.method,
                                      sh,
                                      opt.auto_hosts,
                                      opt.auto_nets,
                                      includes,
                                      excludes,
                                      opt.daemon,
                                      opt.to_ns,
                                      opt.pidfile,
                                      opt.user,
                                      opt.sudo_pythonpath)

            if return_code == 0:
                log('Normal exit code, exiting...')
            else:
                log('Abnormal exit code %d detected, failing...' % return_code)
            return return_code

    except Fatal as e:
        log('fatal: %s\n' % e)
        return 99
    except KeyboardInterrupt:
        log('\n')
        log('Keyboard interrupt: exiting.\n')
        return 1