## This file is part of Scapy
## See http://www.secdev.org/projects/scapy for more informations
## Copyright (C) Philippe Biondi <phil@secdev.org>
## This program is published under a GPLv2 license

"""
PPP (Point to Point Protocol)

[RFC 1661]
"""

import struct
from scapy.packet import Packet, bind_layers
from scapy.layers.l2 import Ether, CookedLinux
from scapy.layers.inet import IP
from scapy.layers.inet6 import IPv6
from scapy.fields import BitField, ByteEnumField, ByteField, \
    ConditionalField, FieldLenField, IPField, PacketListField, \
    ShortEnumField, ShortField, StrFixedLenField, StrLenField, XByteField, \
    XShortField


class PPPoE(Packet):
    name = "PPP over Ethernet"
    fields_desc = [ BitField("version", 1, 4),
                    BitField("type", 1, 4),
                    ByteEnumField("code", 0, {0:"Session"}),
                    XShortField("sessionid", 0x0),
                    ShortField("len", None) ]

    def post_build(self, p, pay):
        p += pay
        if self.len is None:
            l = len(p)-6
            p = p[:4]+struct.pack("!H", l)+p[6:]
        return p

class PPPoED(PPPoE):
    name = "PPP over Ethernet Discovery"
    fields_desc = [ BitField("version", 1, 4),
                    BitField("type", 1, 4),
                    ByteEnumField("code", 0x09, {0x09:"PADI",0x07:"PADO",0x19:"PADR",0x65:"PADS",0xa7:"PADT"}),
                    XShortField("sessionid", 0x0),
                    ShortField("len", None) ]


_PPP_proto = { 0x0001: "Padding Protocol",
               0x0003: "ROHC small-CID [RFC3095]",
               0x0005: "ROHC large-CID [RFC3095]",
               0x0021: "Internet Protocol version 4",
               0x0023: "OSI Network Layer",
               0x0025: "Xerox NS IDP",
               0x0027: "DECnet Phase IV",
               0x0029: "Appletalk",
               0x002b: "Novell IPX",
               0x002d: "Van Jacobson Compressed TCP/IP",
               0x002f: "Van Jacobson Uncompressed TCP/IP",
               0x0031: "Bridging PDU",
               0x0033: "Stream Protocol (ST-II)",
               0x0035: "Banyan Vines",
               0x0037: "reserved (until 1993) [Typo in RFC1172]",
               0x0039: "AppleTalk EDDP",
               0x003b: "AppleTalk SmartBuffered",
               0x003d: "Multi-Link [RFC1717]",
               0x003f: "NETBIOS Framing",
               0x0041: "Cisco Systems",
               0x0043: "Ascom Timeplex",
               0x0045: "Fujitsu Link Backup and Load Balancing (LBLB)",
               0x0047: "DCA Remote Lan",
               0x0049: "Serial Data Transport Protocol (PPP-SDTP)",
               0x004b: "SNA over 802.2",
               0x004d: "SNA",
               0x004f: "IPv6 Header Compression",
               0x0051: "KNX Bridging Data [ianp]",
               0x0053: "Encryption [Meyer]",
               0x0055: "Individual Link Encryption [Meyer]",
               0x0057: "Internet Protocol version 6 [Hinden]",
               0x0059: "PPP Muxing [RFC3153]",
               0x005b: "Vendor-Specific Network Protocol (VSNP) [RFC3772]",
               0x0061: "RTP IPHC Full Header [RFC3544]",
               0x0063: "RTP IPHC Compressed TCP [RFC3544]",
               0x0065: "RTP IPHC Compressed Non TCP [RFC3544]",
               0x0067: "RTP IPHC Compressed UDP 8 [RFC3544]",
               0x0069: "RTP IPHC Compressed RTP 8 [RFC3544]",
               0x006f: "Stampede Bridging",
               0x0071: "Reserved [Fox]",
               0x0073: "MP+ Protocol [Smith]",
               0x007d: "reserved (Control Escape) [RFC1661]",
               0x007f: "reserved (compression inefficient [RFC1662]",
               0x0081: "Reserved Until 20-Oct-2000 [IANA]",
               0x0083: "Reserved Until 20-Oct-2000 [IANA]",
               0x00c1: "NTCITS IPI [Ungar]",
               0x00cf: "reserved (PPP NLID)",
               0x00fb: "single link compression in multilink [RFC1962]",
               0x00fd: "compressed datagram [RFC1962]",
               0x00ff: "reserved (compression inefficient)",
               0x0201: "802.1d Hello Packets",
               0x0203: "IBM Source Routing BPDU",
               0x0205: "DEC LANBridge100 Spanning Tree",
               0x0207: "Cisco Discovery Protocol [Sastry]",
               0x0209: "Netcs Twin Routing [Korfmacher]",
               0x020b: "STP - Scheduled Transfer Protocol [Segal]",
               0x020d: "EDP - Extreme Discovery Protocol [Grosser]",
               0x0211: "Optical Supervisory Channel Protocol (OSCP)[Prasad]",
               0x0213: "Optical Supervisory Channel Protocol (OSCP)[Prasad]",
               0x0231: "Luxcom",
               0x0233: "Sigma Network Systems",
               0x0235: "Apple Client Server Protocol [Ridenour]",
               0x0281: "MPLS Unicast [RFC3032]  ",
               0x0283: "MPLS Multicast [RFC3032]",
               0x0285: "IEEE p1284.4 standard - data packets [Batchelder]",
               0x0287: "ETSI TETRA Network Protocol Type 1 [Nieminen]",
               0x0289: "Multichannel Flow Treatment Protocol [McCann]",
               0x2063: "RTP IPHC Compressed TCP No Delta [RFC3544]",
               0x2065: "RTP IPHC Context State [RFC3544]",
               0x2067: "RTP IPHC Compressed UDP 16 [RFC3544]",
               0x2069: "RTP IPHC Compressed RTP 16 [RFC3544]",
               0x4001: "Cray Communications Control Protocol [Stage]",
               0x4003: "CDPD Mobile Network Registration Protocol [Quick]",
               0x4005: "Expand accelerator protocol [Rachmani]",
               0x4007: "ODSICP NCP [Arvind]",
               0x4009: "DOCSIS DLL [Gaedtke]",
               0x400B: "Cetacean Network Detection Protocol [Siller]",
               0x4021: "Stacker LZS [Simpson]",
               0x4023: "RefTek Protocol [Banfill]",
               0x4025: "Fibre Channel [Rajagopal]",
               0x4027: "EMIT Protocols [Eastham]",
               0x405b: "Vendor-Specific Protocol (VSP) [RFC3772]",
               0x8021: "Internet Protocol Control Protocol",
               0x8023: "OSI Network Layer Control Protocol",
               0x8025: "Xerox NS IDP Control Protocol",
               0x8027: "DECnet Phase IV Control Protocol",
               0x8029: "Appletalk Control Protocol",
               0x802b: "Novell IPX Control Protocol",
               0x802d: "reserved",
               0x802f: "reserved",
               0x8031: "Bridging NCP",
               0x8033: "Stream Protocol Control Protocol",
               0x8035: "Banyan Vines Control Protocol",
               0x8037: "reserved (until 1993)",
               0x8039: "reserved",
               0x803b: "reserved",
               0x803d: "Multi-Link Control Protocol",
               0x803f: "NETBIOS Framing Control Protocol",
               0x8041: "Cisco Systems Control Protocol",
               0x8043: "Ascom Timeplex",
               0x8045: "Fujitsu LBLB Control Protocol",
               0x8047: "DCA Remote Lan Network Control Protocol (RLNCP)",
               0x8049: "Serial Data Control Protocol (PPP-SDCP)",
               0x804b: "SNA over 802.2 Control Protocol",
               0x804d: "SNA Control Protocol",
               0x804f: "IP6 Header Compression Control Protocol",
               0x8051: "KNX Bridging Control Protocol [ianp]",
               0x8053: "Encryption Control Protocol [Meyer]",
               0x8055: "Individual Link Encryption Control Protocol [Meyer]",
               0x8057: "IPv6 Control Protovol [Hinden]",
               0x8059: "PPP Muxing Control Protocol [RFC3153]",
               0x805b: "Vendor-Specific Network Control Protocol (VSNCP) [RFC3772]",
               0x806f: "Stampede Bridging Control Protocol",
               0x8073: "MP+ Control Protocol [Smith]",
               0x8071: "Reserved [Fox]",
               0x807d: "Not Used - reserved [RFC1661]",
               0x8081: "Reserved Until 20-Oct-2000 [IANA]",
               0x8083: "Reserved Until 20-Oct-2000 [IANA]",
               0x80c1: "NTCITS IPI Control Protocol [Ungar]",
               0x80cf: "Not Used - reserved [RFC1661]",
               0x80fb: "single link compression in multilink control [RFC1962]",
               0x80fd: "Compression Control Protocol [RFC1962]",
               0x80ff: "Not Used - reserved [RFC1661]",
               0x8207: "Cisco Discovery Protocol Control [Sastry]",
               0x8209: "Netcs Twin Routing [Korfmacher]",
               0x820b: "STP - Control Protocol [Segal]",
               0x820d: "EDPCP - Extreme Discovery Protocol Ctrl Prtcl [Grosser]",
               0x8235: "Apple Client Server Protocol Control [Ridenour]",
               0x8281: "MPLSCP [RFC3032]",
               0x8285: "IEEE p1284.4 standard - Protocol Control [Batchelder]",
               0x8287: "ETSI TETRA TNP1 Control Protocol [Nieminen]",
               0x8289: "Multichannel Flow Treatment Protocol [McCann]",
               0xc021: "Link Control Protocol",
               0xc023: "Password Authentication Protocol",
               0xc025: "Link Quality Report",
               0xc027: "Shiva Password Authentication Protocol",
               0xc029: "CallBack Control Protocol (CBCP)",
               0xc02b: "BACP Bandwidth Allocation Control Protocol [RFC2125]",
               0xc02d: "BAP [RFC2125]",
               0xc05b: "Vendor-Specific Authentication Protocol (VSAP) [RFC3772]",
               0xc081: "Container Control Protocol [KEN]",
               0xc223: "Challenge Handshake Authentication Protocol",
               0xc225: "RSA Authentication Protocol [Narayana]",
               0xc227: "Extensible Authentication Protocol [RFC2284]",
               0xc229: "Mitsubishi Security Info Exch Ptcl (SIEP) [Seno]",
               0xc26f: "Stampede Bridging Authorization Protocol",
               0xc281: "Proprietary Authentication Protocol [KEN]",
               0xc283: "Proprietary Authentication Protocol [Tackabury]",
               0xc481: "Proprietary Node ID Authentication Protocol [KEN]"}


class HDLC(Packet):
    fields_desc = [ XByteField("address",0xff),
                    XByteField("control",0x03)  ]

class PPP(Packet):
    name = "PPP Link Layer"
    fields_desc = [ ShortEnumField("proto", 0x0021, _PPP_proto) ]
    @classmethod
    def dispatch_hook(cls, _pkt=None, *args, **kargs):
        if _pkt and _pkt[0] == '\xff':
            cls = HDLC
        return cls

_PPP_conftypes = { 1:"Configure-Request",
                   2:"Configure-Ack",
                   3:"Configure-Nak",
                   4:"Configure-Reject",
                   5:"Terminate-Request",
                   6:"Terminate-Ack",
                   7:"Code-Reject",
                   8:"Protocol-Reject",
                   9:"Echo-Request",
                   10:"Echo-Reply",
                   11:"Discard-Request",
                   14:"Reset-Request",
                   15:"Reset-Ack",
                   }


### PPP IPCP stuff (RFC 1332)

# All IPCP options are defined below (names and associated classes) 
_PPP_ipcpopttypes = {     1:"IP-Addresses (Deprecated)",
                          2:"IP-Compression-Protocol",
                          3:"IP-Address",
                          4:"Mobile-IPv4", # not implemented, present for completeness
                          129:"Primary-DNS-Address",
                          130:"Primary-NBNS-Address",
                          131:"Secondary-DNS-Address",
                          132:"Secondary-NBNS-Address"}


class PPP_IPCP_Option(Packet):
    name = "PPP IPCP Option"
    fields_desc = [ ByteEnumField("type" , None , _PPP_ipcpopttypes),
                    FieldLenField("len", None, length_of="data", fmt="B", adjust=lambda p,x:x+2),
                    StrLenField("data", "", length_from=lambda p:max(0,p.len-2)) ]
    def extract_padding(self, pay):
        return "",pay

    registered_options = {}
    @classmethod
    def register_variant(cls):
        cls.registered_options[cls.type.default] = cls
    @classmethod
    def dispatch_hook(cls, _pkt=None, *args, **kargs):
        if _pkt:
            o = ord(_pkt[0])
            return cls.registered_options.get(o, cls)
        return cls


class PPP_IPCP_Option_IPAddress(PPP_IPCP_Option):
    name = "PPP IPCP Option: IP Address"
    fields_desc = [ ByteEnumField("type" , 3 , _PPP_ipcpopttypes),
                    FieldLenField("len", None, length_of="data", fmt="B", adjust=lambda p,x:x+2),
                    IPField("data","0.0.0.0"),
                    ConditionalField(StrLenField("garbage","", length_from=lambda pkt:pkt.len-6), lambda p:p.len!=6) ]

class PPP_IPCP_Option_DNS1(PPP_IPCP_Option):
    name = "PPP IPCP Option: DNS1 Address"
    fields_desc = [ ByteEnumField("type" , 129 , _PPP_ipcpopttypes),
                    FieldLenField("len", None, length_of="data", fmt="B", adjust=lambda p,x:x+2),
                    IPField("data","0.0.0.0"),
                    ConditionalField(StrLenField("garbage","", length_from=lambda pkt:pkt.len-6), lambda p:p.len!=6) ]

class PPP_IPCP_Option_DNS2(PPP_IPCP_Option):
    name = "PPP IPCP Option: DNS2 Address"
    fields_desc = [ ByteEnumField("type" , 131 , _PPP_ipcpopttypes),
                    FieldLenField("len", None, length_of="data", fmt="B", adjust=lambda p,x:x+2),
                    IPField("data","0.0.0.0"),
                    ConditionalField(StrLenField("garbage","", length_from=lambda pkt:pkt.len-6), lambda p:p.len!=6) ]

class PPP_IPCP_Option_NBNS1(PPP_IPCP_Option):
    name = "PPP IPCP Option: NBNS1 Address"
    fields_desc = [ ByteEnumField("type" , 130 , _PPP_ipcpopttypes),
                    FieldLenField("len", None, length_of="data", fmt="B", adjust=lambda p,x:x+2),
                    IPField("data","0.0.0.0"),
                    ConditionalField(StrLenField("garbage","", length_from=lambda pkt:pkt.len-6), lambda p:p.len!=6) ]

class PPP_IPCP_Option_NBNS2(PPP_IPCP_Option):
    name = "PPP IPCP Option: NBNS2 Address"
    fields_desc = [ ByteEnumField("type" , 132 , _PPP_ipcpopttypes),
                    FieldLenField("len", None, length_of="data", fmt="B", adjust=lambda p,x:x+2),
                    IPField("data","0.0.0.0"),
                    ConditionalField(StrLenField("garbage","", length_from=lambda pkt:pkt.len-6), lambda p:p.len!=6) ]


class PPP_IPCP(Packet):
    fields_desc = [ ByteEnumField("code" , 1, _PPP_conftypes),
		    XByteField("id", 0 ),
                    FieldLenField("len" , None, fmt="H", length_of="options", adjust=lambda p,x:x+4 ),
                    PacketListField("options", [],  PPP_IPCP_Option, length_from=lambda p:p.len-4,) ]


### ECP

_PPP_ecpopttypes = { 0:"OUI",
                     1:"DESE", }

class PPP_ECP_Option(Packet):
    name = "PPP ECP Option"
    fields_desc = [ ByteEnumField("type" , None , _PPP_ecpopttypes),
                    FieldLenField("len", None, length_of="data", fmt="B", adjust=lambda p,x:x+2),
                    StrLenField("data", "", length_from=lambda p:max(0,p.len-2)) ]
    def extract_padding(self, pay):
        return "",pay

    registered_options = {}
    @classmethod
    def register_variant(cls):
        cls.registered_options[cls.type.default] = cls
    @classmethod
    def dispatch_hook(cls, _pkt=None, *args, **kargs):
        if _pkt:
            o = ord(_pkt[0])
            return cls.registered_options.get(o, cls)
        return cls

class PPP_ECP_Option_OUI(PPP_ECP_Option):
    fields_desc = [ ByteEnumField("type" , 0 , _PPP_ecpopttypes),
                    FieldLenField("len", None, length_of="data", fmt="B", adjust=lambda p,x:x+6),
                    StrFixedLenField("oui","",3),
                    ByteField("subtype",0),
                    StrLenField("data", "", length_from=lambda p:p.len-6) ]
                    


class PPP_ECP(Packet):
    fields_desc = [ ByteEnumField("code" , 1, _PPP_conftypes),
		    XByteField("id", 0 ),
                    FieldLenField("len" , None, fmt="H", length_of="options", adjust=lambda p,x:x+4 ),
                    PacketListField("options", [],  PPP_ECP_Option, length_from=lambda p:p.len-4,) ]

bind_layers( Ether,         PPPoED,        type=0x8863)
bind_layers( Ether,         PPPoE,         type=0x8864)
bind_layers( CookedLinux,   PPPoED,        proto=0x8863)
bind_layers( CookedLinux,   PPPoE,         proto=0x8864)
bind_layers( PPPoE,         PPP,           code=0)
bind_layers( HDLC,          PPP,           )
bind_layers( PPP,           IP,            proto=0x0021)
bind_layers( PPP,           IPv6,          proto=0x0057)
bind_layers( PPP,           PPP_IPCP,      proto=0x8021)
bind_layers( PPP,           PPP_ECP,       proto=0x8053)
bind_layers( Ether,         PPP_IPCP,      type=0x8021)
bind_layers( Ether,         PPP_ECP,       type=0x8053)
