#!/usr/bin/python
#
# Copyright 2014 Cumulus Networks, Inc. All rights reserved.
# Author: Roopa Prabhu, roopa@cumulusnetworks.com
#
# ifupdown --
#    tool to configure network interfaces
#
import sys
import os
import argcomplete
import argparse
import ConfigParser
import StringIO
import logging
import logging.handlers
import resource
from ifupdown.ifupdownmain import *
from ifupdown.utils import *

lockfile="/run/network/.lock"
configfile="/etc/network/ifupdown2/ifupdown2.conf"
configmap_g=None
logger = None
interfacesfileiobuf=None
ENVPATH = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

def run_up(args):
    logger.debug('args = %s' %str(args))

    try:
        iflist = args.iflist
        if len(args.iflist) == 0:
            iflist = None
        logger.debug('creating ifupdown object ..')
        cachearg=(False if (iflist or args.nocache or
                            args.perfmode or args.noact)
                            else True)
        ifupdown_handle = ifupdownMain(config=configmap_g,
                                       force=args.force,
                                       withdepends=args.withdepends,
                                       perfmode=args.perfmode,
                                       dryrun=args.noact,
                                       cache=cachearg,
                                       addons_enable=not args.noaddons,
                                       statemanager_enable=not args.noaddons,
                                       interfacesfile=args.interfacesfile,
                                       interfacesfileiobuf=interfacesfileiobuf,
                                       interfacesfileformat=args.interfacesfileformat)
        if args.noaddons:
            ifupdown_handle.up(['up'], args.all, args.CLASS, iflist,
                               excludepats=args.excludepats,
                               printdependency=args.printdependency,
                               syntaxcheck=args.syntaxcheck, type=args.type,
                               skipupperifaces=args.skipupperifaces)
        else:
            ifupdown_handle.up(['pre-up', 'up', 'post-up'],
                               args.all, args.CLASS, iflist,
                               excludepats=args.excludepats,
                               printdependency=args.printdependency,
                               syntaxcheck=args.syntaxcheck, type=args.type,
                               skipupperifaces=args.skipupperifaces)
    except:
        raise

def run_down(args):
    logger.debug('args = %s' %str(args))

    try:
        iflist = args.iflist
        logger.debug('creating ifupdown object ..')
        ifupdown_handle = ifupdownMain(config=configmap_g, force=args.force,
                                       withdepends=args.withdepends,
                                       perfmode=args.perfmode,
                                       dryrun=args.noact,
                                       addons_enable=not args.noaddons,
                                       statemanager_enable=not args.noaddons,
                                       interfacesfile=args.interfacesfile,
                                       interfacesfileiobuf=interfacesfileiobuf,
                                       interfacesfileformat=args.interfacesfileformat)

        ifupdown_handle.down(['pre-down', 'down', 'post-down'],
                             args.all, args.CLASS, iflist,
                             excludepats=args.excludepats,
                             printdependency=args.printdependency,
                             usecurrentconfig=args.usecurrentconfig,
                             type=args.type)
    except:
        raise

def run_query(args):
    logger.debug('args = %s' %str(args))

    try:
        iflist = args.iflist
        if args.checkcurr:
            qop='query-checkcurr'
        elif args.running:
            qop='query-running'
        elif args.raw:
            qop='query-raw'
        elif args.syntaxhelp:
            qop = 'query-syntax'
        elif args.printdependency:
            qop = 'query-dependency'
        elif args.printsavedstate:
            qop = 'query-savedstate'
        else:
            qop='query'
        cachearg=(False if (iflist or args.nocache or
                            args.perfmode or args.syntaxhelp or
                            (qop != 'query-checkcurr' and
                            qop != 'query-running')) else True)
        if not iflist and qop == 'query-running':
            iflist = [i for i in os.listdir('/sys/class/net/')
                        if os.path.isdir('/sys/class/net/%s' %i)]
        logger.debug('creating ifupdown object ..')
        ifupdown_handle = ifupdownMain(config=configmap_g,
                                       withdepends=args.withdepends,
                                       perfmode=args.perfmode,
                                       cache=cachearg,
                                       interfacesfile=args.interfacesfile,
                                       interfacesfileiobuf=interfacesfileiobuf,
                                       interfacesfileformat=args.interfacesfileformat)

        ifupdown_handle.query([qop], args.all, args.CLASS, iflist,
                              excludepats=args.excludepats,
                              printdependency=args.printdependency,
                              format=args.format, type=args.type)
    except:
        raise

def run_reload(args):
    logger.debug('args = %s' %str(args))

    try:
        logger.debug('creating ifupdown object ..')
        ifupdown_handle = ifupdownMain(config=configmap_g,
                                       withdepends=args.withdepends,
                                       perfmode=args.perfmode)
        ifupdown_handle.reload(['pre-up', 'up', 'post-up'],
                               ['pre-down', 'down', 'post-down'],
                               auto=args.all, allow=None, ifacenames=None,
                               excludepats=args.excludepats,
                               usecurrentconfig=args.usecurrentconfig,
                               currentlyup=args.currentlyup)
    except:
        raise

def init(args):
    global logger
    global interfacesfileiobuf

    log_level = logging.WARNING
    if args.verbose:
        log_level = logging.INFO
    if args.debug:
        log_level = logging.DEBUG

    try:
        if hasattr(args, 'syslog') and args.syslog:
            root_logger = logging.getLogger()
            syslog_handler = logging.handlers.SysLogHandler(address='/dev/log',
                             facility=logging.handlers.SysLogHandler.LOG_DAEMON)
            logging.addLevelName(logging.ERROR, 'error')
            logging.addLevelName(logging.WARNING, 'warning')
            logging.addLevelName(logging.DEBUG, 'debug')
            logging.addLevelName(logging.INFO, 'info')
            root_logger.setLevel(log_level)
            syslog_handler.setFormatter(logging.Formatter(
                '%(name)s: %(levelname)s: %(message)s'))
            root_logger.addHandler(syslog_handler)
            logger = logging.getLogger('ifupdown')
        else:
            logging.basicConfig(level=log_level,
                format='%(levelname)s: %(message)s')
            logging.addLevelName(logging.ERROR, 'error')
            logging.addLevelName(logging.WARNING, 'warning')
            logging.addLevelName(logging.DEBUG, 'debug')
            logging.addLevelName(logging.INFO, 'info')
            logger = logging.getLogger('ifupdown')
    except:
        raise

    # If interfaces file is stdin, read
    if hasattr(args, 'interfacesfile') and args.interfacesfile == '-':
        interfacesfileiobuf = sys.stdin.read()

def deinit():
    {}

def update_argparser(argparser):
    """ base parser, common to all commands """

    argparser.add_argument('-a', '--all', action='store_true', required=False,
                help='process all interfaces marked \"auto\"')
    argparser.add_argument('iflist', metavar='IFACE',
                nargs='*', help='interface list separated by spaces. ' +
                'IFACE list is mutually exclusive with -a option.')
    argparser.add_argument('-v', '--verbose', dest='verbose',
                action='store_true', help='verbose')
    argparser.add_argument('-d', '--debug', dest='debug',
                action='store_true',
                help='output debug info')
    argparser.add_argument('-q', '--quiet', dest='quiet',
                action='store_true',
                help=argparse.SUPPRESS)
    argparser.add_argument('--allow', dest='CLASS', 
                help='ignore non-\"allow-CLASS\" interfaces')
    argparser.add_argument('-w', '--with-depends', dest='withdepends',
                action='store_true', help='run with all dependent interfaces.'+
                ' This option is redundant when \'-a\' is specified. With ' +
                '\'-a\' interfaces are always executed in dependency order')
    argparser.add_argument('--perfmode', dest='perfmode',
                action='store_true', help=argparse.SUPPRESS)
    #argparser.add_argument('-j', '--jobs', dest='jobs', type=int,
    #            default=-1, choices=range(1,12), help=argparse.SUPPRESS)
    argparser.add_argument('--nocache', dest='nocache', action='store_true',
                help=argparse.SUPPRESS)
    argparser.add_argument('-X', '--exclude', dest='excludepats',
                action='append',
                help='Exclude interfaces from the list of interfaces' +
                ' to operate on. Can be specified multiple times.')
    argparser.add_argument('-i', '--interfaces', dest='interfacesfile',
                default='/etc/network/interfaces',
                help='use interfaces file instead of default ' +
                '/etc/network/interfaces')
    argparser.add_argument('-t', '--interfaces-format',
                dest='interfacesfileformat',
                default='native',
                choices=['native', 'json'],
                help='interfaces file format')
    argparser.add_argument('-T', '--type',
                dest='type',
                default=None,
                choices=['iface', 'vlan'],
                help='type of interface entry (iface or vlan).' +
                     'This option can be used in case of ambiguity between ' +
                     'a vlan interface and an iface interface of the same name')

def update_ifupdown_argparser(argparser):
    """ common arg parser for ifup and ifdown """
    argparser.add_argument('-f', '--force', dest='force',
                action='store_true',
                help='force run all operations')
    argparser.add_argument('-l', '--syslog', dest='syslog',
                action='store_true',
                help=argparse.SUPPRESS)
    group = argparser.add_mutually_exclusive_group(required=False)
    group.add_argument('-n', '--no-act', dest='noact',
                action='store_true', help='print out what would happen,' +
                'but don\'t do it')
    group.add_argument('-p', '--print-dependency',
                dest='printdependency', choices=['list', 'dot'],
                help='print iface dependency')
    group.add_argument('--no-scripts', '--admin-state',
                dest='noaddons',  action='store_true',
                help='dont run any addon modules/scripts. Only bring the ' +
                    'interface administratively up/down')

def update_ifup_argparser(argparser):
    argparser.add_argument('-s', '--syntax-check', dest='syntaxcheck',
                action='store_true',
                help='Only run the interfaces file parser')
    argparser.add_argument('-k', '--skip-upperifaces', dest='skipupperifaces',
                action='store_true',
                help='ifup by default tries to add newly created interfaces' +
                ' into its upper/parent interfaces. Eg. if a bridge port is' +
                ' created as a result of ifup on the port, ifup automatically' +
                ' adds the port to the bridge. This option can be used to ' +
                'disable this default behaviour')
    update_ifupdown_argparser(argparser)

def update_ifdown_argparser(argparser):
    update_ifupdown_argparser(argparser)
    argparser.add_argument('-u', '--use-current-config',
                dest='usecurrentconfig',  action='store_true',
                help='By default ifdown looks at the saved state for ' +
                'interfaces to bring down. This option allows ifdown to ' +
                'look at the current interfaces file. Useful when your ' +
                'state file is corrupted or you want down to use the latest '
                'from the interfaces file')

def update_ifquery_argparser(argparser):
    """ arg parser for ifquery options """

    # -l is same as '-a', only here for backward compatibility
    argparser.add_argument('-l', '--list', action='store_true', dest='all',
                help=argparse.SUPPRESS)
    group = argparser.add_mutually_exclusive_group(required=False)
    group.add_argument('-r', '--running', dest='running',
                       action='store_true',
                       help='query running state of an interface')
    group.add_argument('-c', '--check', dest='checkcurr',
                       action='store_true',
                       help='check interface file contents against ' +
                       'running state of an interface')
    group.add_argument('-x', '--raw', action='store_true', dest='raw',
                       help='print raw config file entries')
    group.add_argument('--print-savedstate', action='store_true',
                       dest='printsavedstate',
                       help=argparse.SUPPRESS)
    argparser.add_argument('-o', '--format', dest='format', default='native',
                           choices=['native', 'json'],
                           help='interface display format')
    argparser.add_argument('-p', '--print-dependency',
                           dest='printdependency', choices=['list', 'dot'],
                           help='print interface dependency')
    argparser.add_argument('-s', '--syntax-help', action='store_true',
                           dest='syntaxhelp',
                           help='print supported interface config syntax')

def update_ifreload_argparser(argparser):
    """ parser for ifreload """
    group = argparser.add_mutually_exclusive_group(required=True)
    group.add_argument('-a', '--all', action='store_true',
                help='process all interfaces marked \"auto\"')
    group.add_argument('-c', '--currently-up', dest='currentlyup',
                action='store_true',
                help='only reload auto and other interfaces that are ' +
                'currently up')
    argparser.add_argument('iflist', metavar='IFACE',
                nargs='*', help=argparse.SUPPRESS)
    argparser.add_argument('-n', '--no-act', dest='noact',
                action='store_true', help=argparse.SUPPRESS)
    argparser.add_argument('-v', '--verbose', dest='verbose',
                action='store_true', help='verbose')
    argparser.add_argument('-d', '--debug', dest='debug',
                action='store_true',
                help='output debug info')
    argparser.add_argument('-w', '--with-depends', dest='withdepends',
                action='store_true', help=argparse.SUPPRESS)
    argparser.add_argument('--perfmode', dest='perfmode',
                action='store_true', help=argparse.SUPPRESS)
    argparser.add_argument('--nocache', dest='nocache', action='store_true',
                help=argparse.SUPPRESS)
    argparser.add_argument('-X', '--exclude', dest='excludepats',
                action='append',
                help=argparse.SUPPRESS)
    #argparser.add_argument('-j', '--jobs', dest='jobs', type=int,
    #            default=-1, choices=range(1,12), help=argparse.SUPPRESS)
    #argparser.add_argument('-i', '--interfaces', dest='interfacesfile',
    #            default='/etc/network/interfaces',
    #            help='use interfaces file instead of default ' +
    #            '/etc/network/interfaces')
    argparser.add_argument('-u', '--use-current-config',
                dest='usecurrentconfig',  action='store_true',
                help='By default ifreload looks at saved state for ' +
                'interfaces to bring down. With this option ifreload will'
                ' only look at the current interfaces file. Useful when your ' +
                'state file is corrupted or you want down to use the latest '
                'from the interfaces file')
    argparser.add_argument('-l', '--syslog', dest='syslog',
                action='store_true',
                help=argparse.SUPPRESS)
    argparser.add_argument('-f', '--force', dest='force',
                action='store_true',
                help='force run all operations')

def parse_args(argsv, op):
    if op == 'query':
        descr = 'query interfaces (all or interface list)'
    elif op == 'reload':
        descr = 'reload interface configuration.'
    else:
        descr = 'interface management'
    argparser = argparse.ArgumentParser(description=descr)
    if op == 'reload':
        update_ifreload_argparser(argparser)
    else:
        update_argparser(argparser)
        if op == 'up':
            update_ifup_argparser(argparser)
        elif op == 'down':
            update_ifdown_argparser(argparser)
        elif op == 'query':
            update_ifquery_argparser(argparser)
        elif op == 'reload':
            update_ifreload_argparser(argparser)
    argcomplete.autocomplete(argparser)
    return argparser.parse_args(argsv)

handlers = {'up' : run_up,
            'down' : run_down,
            'query' : run_query,
            'reload' : run_reload }

def validate_args(op, args):
    #if op == 'up' and args.syntaxcheck:
    #    if args.iflist or args.all:
    #        print 'ignoring interface options ..'
    #    return True
    if op == 'query' and args.syntaxhelp:
        return True
    if op == 'reload':
        if not args.all and not args.currentlyup:
            print '\'-a\' or \'-c\' option is required'
            return False
    elif (not args.iflist and
            not args.all and not args.CLASS):
        print '\'-a\' option or interface list are required'
        return False
    if args.iflist and args.all:
        print '\'-a\' option and interface list are mutually exclusive'
        return False
    if op != 'reload' and args.CLASS and (args.all or args.iflist):
        print ('\'--allow\' option is mutually exclusive ' +
               'with interface list and \'-a\'')
        return False
    return True

def read_config(args):
    global configmap_g

    config = open(configfile, 'r').read()
    configStr = '[ifupdown2]\n' + config
    configFP =  StringIO.StringIO(configStr)
    parser = ConfigParser.RawConfigParser()
    parser.readfp(configFP)
    configmap_g = dict(parser.items('ifupdown2'))

    # Preprocess config map
    configval = configmap_g.get('multiple_vlan_aware_bridge_support', '0')
    if configval == '0':
        # if multiple bridges not allowed, set the bridge-vlan-aware
        # attribute in the 'no_repeats' config, so that the ifupdownmain
        # module can catch it appropriately
        configmap_g['no_repeats'] = {'bridge-vlan-aware' : 'yes'}


    configval = configmap_g.get('link_master_slave', '0')
    if configval == '1':
        # link_master_slave is only valid when all is set
        if hasattr(args, 'all') and not args.all:
            configmap_g['link_master_slave'] = '0'

    configval = configmap_g.get('delay_admin_state_change', '0')
    if configval == '1':
        # reset link_master_slave if delay_admin_state_change is on
        configmap_g['link_master_slave'] = '0'

def main(argv):
    """ main function """
    args = None
    try:
        op = None
        if argv[0].endswith('ifup'):
            op = 'up'
        elif argv[0].endswith('ifdown'):
            op = 'down'
        elif argv[0].endswith('ifquery'):
            op = 'query'
        elif argv[0].endswith('ifreload'):
            op = 'reload'
        else:
            print ('Unexpected executable.' +
                   ' Should be \'ifup\' or \'ifdown\' or \'ifquery\'')
            exit(1)
        # Command line arg parser
        args = parse_args(argv[1:], op)
        if not validate_args(op, args):
            exit(1)

        if not sys.argv[0].endswith('ifquery') and not os.geteuid() == 0:
            print 'error: must be root to run this command'
            exit(1)

        if not sys.argv[0].endswith('ifquery') and not utils.lockFile(lockfile):
            print 'Another instance of this program is already running.'
            exit(0)

        read_config(args)
        init(args)
        handlers.get(op)(args)
    except Exception, e:
        if not str(e):
            exit(1)
        if args and args.debug:
            raise
        else:
            if logger:
                logger.error(str(e))
            else:
                print str(e)
            #if args and not args.debug:
            #    print '\nrerun the command with \'-d\' for a detailed errormsg'
        exit(1)
    finally:
        deinit()

if __name__ == "__main__":

    # required during boot
    os.putenv('PATH', ENVPATH)
    resource.setrlimit(resource.RLIMIT_CORE, (0,0))
    main(sys.argv)