#-*- coding: utf-8 -*-

# Copyright 2008-2013 Calculate Ltd. http://www.calculate-linux.org
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

from files import ( process, checkUtils, readFile, listDirectory,readLinesFile, 
                   getRunCommands, getProgPath )
import sys,os
import re
import struct,fcntl,socket,math,ctypes
from os import path
import select, time

from calculate.lib.cl_lang import setLocalTranslate
setLocalTranslate('cl_lib3',sys.modules[__name__])

SYSFS_NET_PATH = "/sys/class/net"
PROCFS_NET_PATH = "/proc/net/dev"

# From linux/sockios.h
SIOCGIFINDEX = 0x8933
SIOCGIFFLAGS =  0x8913
SIOCSIFFLAGS =  0x8914
SIOCSIFHWADDR = 0x8924
SIOCSIFADDR = 0x8916
SIOCSIFNETMASK = 0x891C
SIOCETHTOOL = 0x8946

SIOCGIFADDR = 0x8915
SIOCGIFNETMASK = 0x891B
SIOCGIFHWADDR = 0x8927

# Resources allocated
IFF_RUNNING = 0x40

# ip digit from 0|1-255|254 (template)
IP_DIG = "[%s-9]|(?:1[0-9]|[1-9])[0-9]|2[0-4][0-9]|25[0-%s]"
# ip net 0-32
IP_NET_SUFFIX = "[0-9]|[12][0-9]|3[012]"
# ip digs 1-254,0-254,0-255
IP_DIGS = { 'dig1_254' : IP_DIG % (1,4), 'dig0_254' : IP_DIG % (0,4),
           'dig0_255' : IP_DIG % (0,5), }
# ip addr 10.0.0.12
IP_ADDR = "(%(dig1_254)s)\.(%(dig0_254)s)\.(%(dig0_254)s)\.(%(dig1_254)s)"%\
            IP_DIGS
IP_MASK = "(%(dig0_255)s)\.(%(dig0_255)s)\.(%(dig0_255)s)\.(%(dig0_255)s)"%\
            IP_DIGS
# ip addr for net 10.0.0.0
IP_NET = "(%(dig1_254)s)\.(%(dig0_254)s)\.(%(dig0_254)s)\.(%(dig0_254)s)"%\
            IP_DIGS
# ip and net 192.168.0.0/16
IP_ADDR_NET = "(%(ipaddr)s)/((%(ipnet)s))"%{'ipaddr':IP_NET,
                                            'ipnet':IP_NET_SUFFIX}

reIp = re.compile("^{0}$".format(IP_ADDR))
reNetSuffix = re.compile("^{0}$".format(IP_NET_SUFFIX))
reNet = re.compile("^{0}$".format(IP_ADDR_NET))
reMask = re.compile("^{0}$".format(IP_MASK))

def checkIp(ip):
    """Check ip"""
    return reIp.match(ip)

def checkNetSuffix(netSuffix):
    """Check net suffix"""
    return reNetSuffix.match(netSuffix)

def checkNet(net):
    """Check net"""
    if not reNet.match(net):
        return False
    ip,op,cidr = net.partition('/')
    mask = strIpToIntIp(cidrToMask(int(cidr)))
    return (strIpToIntIp(ip)&mask) == (strIpToIntIp(ip))

maskDigs = map(lambda x:str(x),(0b10000000,0b11000000,0b11100000,0b11110000,
                                0b11111000,0b11111100,0b11111110,0b11111111))

def checkMask(mask):
    """Check net"""
    if not mask:
        return False
    if mask.count('.') != 3:
        return False
    zero = False
    for dig in mask.split('.'):
        if zero or not dig in maskDigs:
            if dig == "0":
                zero = True
            else:
                return False
    return True

def getIpAndMask(interface="eth0"):
    """Get ip and mask from interface"""
    ifconfig = process('/sbin/ifconfig',interface)
    res = re.search(r"inet addr:(\S+)\s.*Mask:(\S+)",ifconfig.read(),re.S)
    if res:
        return res.groups()
    else:
        return ("","")

def strIpToIntIp(addr):
    """Convert ip specified by string to integer"""
    addr = addr.split('.')
    return ((int(addr[0])<<24)|
           (int(addr[1])<<16)|
           (int(addr[2])<<8)|
           (int(addr[3])))
    return reduce(lambda x,y:x+(int(y[1])<<(y[0]*8)),
           enumerate(reversed(addr.split("."))),0)

def intIpToStrIp(addr):
    """Convert ip specified by integer to string"""
    return "{0}.{1}.{2}.{3}".format(
            addr>>24,(addr>>16)&0xff,(addr>>8)&0xff,addr&0xff)

def numMaskToCidr(netmask):
    """
    Convert integer mask to cidr
    """
    neg_net = ctypes.c_uint32(~netmask).value
    return 32 - int(math.log(neg_net,2))-1 if neg_net else 32

def maskToCidr(mask):
    """Convert mask specified by str to net"""
    mask = strIpToIntIp(mask)
    return numMaskToCidr(mask)

def cidrToMask(cidr):
    """Convert net to mask specified by str"""
    return intIpToStrIp((2**cidr-1)<<(32-cidr))

def getIpNet(ip,mask=None,cidr=None):
    """Get net (xx.xx.xx.xx/xx) by ip address and mask"""
    ip = strIpToIntIp(ip)
    if not mask is None:
        net = maskToCidr(mask)
    else:
        net = int(cidr)
        mask = cidrToMask(net)
    mask = strIpToIntIp(mask)
    return "{ip}/{net}".format(ip=intIpToStrIp(ip&mask),
                               net=net)

def isIpInNet(checkip,*ipnets):
    """Check is ip in specified nets"""
    return map(lambda x:x[0],
          filter(lambda x:strIpToIntIp(checkip)&x[2] == strIpToIntIp(x[1])&x[2],
          map(lambda x:(x[0],x[1][0],strIpToIntIp(cidrToMask(int(x[1][1])))),
          map(lambda x:(x,x.partition('/')[0::2]),
          ipnets))))

def isDhcpIp(interface="eth0"):
    """Get ip by dhcp or static"""
    # dhclients (dhcpcd, dhclient (dhcp), udhcpc (busybox)
    commands = getRunCommands()
    dhcpProgs = ("dhcpcd","dhclient","udhcpc")
    if filter(lambda x:interface in x and any(prog in x for prog in dhcpProgs),
       commands):
        return True
    else:
        # если запущен демон dhcpcd
        if filter(lambda x:"dhcpcd\x00-q" in x,commands):
            curIp = getIp(interface)
            dhcpcd = getProgPath('/sbin/dhcpcd')
            leaseIp = \
                map(lambda x:x.group(1),
                filter(None,
                map(re.compile('^ip_address=(.*)$').search,
                process(dhcpcd,'-U',interface))))
            if not curIp or leaseIp and leaseIp[0] == curIp:
                return True
        return False

def getRouteTable(onlyIface=[]):
    """Get route table, exclude specifed iface"""
    ipProg = checkUtils('/sbin/ip')
    routes = process(ipProg,"route")
    if onlyIface:
        filterRe = re.compile("|".join(map(lambda x:r"dev %s"%x,onlyIface)))
        routes = filter(filterRe.search,routes)
    for line in routes:
        network,op,line = line.partition(" ")
        routeParams = map(lambda x:x.strip(),line.split())
        # (network,{'via':value,'dev':value})
        if network:
            yield (network,dict(zip(routeParams[0::2],routeParams[1::2])))

def getInterfaces():
    """
    Get available interfaces (discard which hasn't device)
    """
    return filter(lambda x:path.exists(path.join(SYSFS_NET_PATH,x,"device")),
           listDirectory(SYSFS_NET_PATH))

def getIp(iface):
    sockfd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    ifreq = struct.pack('16sH14s', iface, socket.AF_INET, '\x00'*14)
    try:
        res = fcntl.ioctl(sockfd, SIOCGIFADDR, ifreq)
    except IOError:
        return ""
    finally:
        sockfd.close()
    ip = struct.unpack('16sH2x4s8x', res)[2]
    return socket.inet_ntoa(ip)

def getPlugged(iface):
    sockfd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    ifreq = struct.pack('16sH14s', iface, socket.AF_INET, '\x00'*14)
    try:
        res = fcntl.ioctl(sockfd, SIOCGIFFLAGS, ifreq)
    except IOError:
        return False
    finally:
        sockfd.close()
    return bool(struct.unpack('16sH2x4s8x', res)[1] & IFF_RUNNING)

def getMask(iface):
    """
    Get mask for interface
    """
    sockfd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    ifreq = struct.pack('16sH14s', iface, socket.AF_INET, '\x00'*14)
    try:
        res = fcntl.ioctl(sockfd, SIOCGIFNETMASK, ifreq)
    except IOError:
        return 0
    finally:
        sockfd.close()
    netmask = socket.ntohl(struct.unpack('16sH2xI8x', res)[2])
    return numMaskToCidr(netmask)

def getMac(iface):
    """
    Get mac for interface
    """
    sockfd = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    ifreq = struct.pack('16sH14s', iface, socket.AF_UNIX, '\x00'*14)
    res = fcntl.ioctl(sockfd, SIOCGIFHWADDR, ifreq)
    address = struct.unpack('16sH14s', res)[2]
    mac = struct.unpack('6B8x', address)
    sockfd.close()
    return ":".join(['%02X' % i for i in mac])

def getOperState(iface):
    """
    Get interface state up or down
    """
    if readFile("/sys/class/net/%s/operstate"%iface) == "down":
        return "down"
    return "up"

def isOpenPort(ip,port):
    """
    Test if an [ip:port] is open
    """
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        s.connect((ip,int(port)))
        s.shutdown(2)
        return True
    except:
        return False

class IPError(Exception):
    """Error received on work with ip"""
    pass
  
class Pinger:
    # ICMP parameters
    ICMP_ECHO       =    8 # Echo request (per RFC792)
    ICMP_MAX_RECV   = 2048 # Max size of incoming buffer

    def checksum(self,source_string):
        """
        A port of the functionality of in_cksum() from ping.c
        Ideally this would act on the string as a series of 16-bit ints (host
        packed), but this works.
        Network data is big-endian, hosts are typically little-endian
        """
        countTo = (int(len(source_string)/2))*2
        sum = 0
        count = 0

        # Handle bytes in pairs (decoding as short ints)
        loByte = 0
        hiByte = 0
        while count < countTo:
            if (sys.byteorder == "little"):
                loByte = ord(source_string[count])
                hiByte = ord(source_string[count + 1])
            else:
                loByte = ord(source_string[count + 1])
                hiByte = ord(source_string[count])
            sum = sum + ((hiByte) * 256 + (loByte))
            count += 2

        # Handle last byte if applicable (odd-number of bytes)
        # Endianness should be irrelevant in this case
        if countTo < len(source_string): # Check for odd length
            loByte = ord(source_string[len(source_string)-1])
            sum += loByte

        sum &= 0xffffffff #Truncate sum to 32 bits (a variance from ping.c,which
                          #uses signed ints, but overflow is unlikely in ping)

        sum = (sum >> 16) + (sum & 0xffff)    # Add high 16 bits to low 16 bits
        sum += (sum >> 16)                    # Add carry from above (if any)
        answer = ~sum & 0xffff              # Invert and truncate to 16 bits
        answer = socket.htons(answer)

        return answer

    def ping(self, destIP, timeout, numDataBytes):
        """
        Returns either the delay (in ms) or None on timeout.
        """
        delay = None

        try: # One could use UDP here, but it's obscure
            mySocket = socket.socket(socket.AF_INET, socket.SOCK_RAW,
                                     socket.getprotobyname("icmp"))
        except socket.error as e:
            raise IPError(_("failed. (socket error: '%s')" % e.args[1]))

        my_ID = os.getpid() & 0xFFFF

        sentTime = self.send_one_ping(mySocket, destIP, my_ID, 0,
                                 numDataBytes)
        if sentTime == None:
            mySocket.close()
            return delay

        recvTime, dataSize, iphSrcIP, icmpSeqNumber, iphTTL = \
                            self.receive_one_ping(mySocket, my_ID, timeout)

        mySocket.close()

        if recvTime:
            delay = (recvTime-sentTime)*1000
            return (dataSize,socket.inet_ntoa(struct.pack("!I", iphSrcIP)),
                    iphTTL,delay)
        else:
            raise IPError(_("Request timed out"))

    def send_one_ping(self,mySocket, destIP, myID, mySeqNumber, numDataBytes):
        """
        Send one ping to the given >destIP<.
        """
        try:
            destIP  =  socket.gethostbyname(destIP)
        except socket.gaierror as e:
            raise IPError(e.strerror)

        # Header is type (8), code (8), checksum (16), id (16), sequence (16)
        myChecksum = 0

        # Make a dummy heder with a 0 checksum.
        header = struct.pack(
            "!BBHHH", self.ICMP_ECHO, 0, myChecksum, myID, mySeqNumber
        )

        padBytes = []
        startVal = 0x42
        for i in range(startVal, startVal + (numDataBytes)):
            padBytes += [(i & 0xff)]  # Keep chars in the 0-255 range
        data = bytes(padBytes)

        # Calculate the checksum on the data and the dummy header.
        # Checksum is in network order
        myChecksum = self.checksum(header + data)

        # Now that we have the right checksum, we put that in. It's just easier
        # to make up a new header than to stuff it into the dummy.
        header = struct.pack(
            "!BBHHH", self.ICMP_ECHO, 0, myChecksum, myID, mySeqNumber
        )

        packet = header + data

        sendTime = time.time()

        try:
            # Port number is irrelevant for ICMP
            mySocket.sendto(packet, (destIP, 1))
        except socket.error as e:
            raise IPError("General failure (%s)" % (e.args[1]))

        return sendTime

    def receive_one_ping(self, mySocket, myID, timeout):
        """
        Receive the ping from the socket. Timeout = in ms
        """
        timeLeft = timeout/1000.0

        while True: # Loop while waiting for packet or timeout
            startedSelect = time.time()
            whatReady = select.select([mySocket], [], [], timeLeft)
            howLongInSelect = (time.time() - startedSelect)
            if whatReady[0] == []: # Timeout
                return None, 0, 0, 0, 0

            timeReceived = time.time()

            recPacket, addr = mySocket.recvfrom(self.ICMP_MAX_RECV)

            ipHeader = recPacket[:20]
            iphVersion, iphTypeOfSvc, iphLength, \
            iphID, iphFlags, iphTTL, iphProtocol, \
            iphChecksum, iphSrcIP, iphDestIP = struct.unpack(
                "!BBHHHBBHII", ipHeader
            )

            icmpHeader = recPacket[20:28]
            icmpType, icmpCode, icmpChecksum, \
            icmpPacketID, icmpSeqNumber = struct.unpack(
                "!BBHHH", icmpHeader
            )

            if icmpPacketID == myID: # Our packet
                dataSize = len(recPacket) - 28
                return timeReceived, dataSize, iphSrcIP, icmpSeqNumber, iphTTL

            timeLeft = timeLeft - howLongInSelect
            if timeLeft <= 0:
                return None, 0, 0, 0, 0