| ## This file is part of Scapy |
| ## See http://www.secdev.org/projects/scapy for more informations |
| ## Copyright (C) Philippe Biondi <phil@secdev.org> |
| ## Copyright (C) 6WIND <olivier.matz@6wind.com> |
| ## This program is published under a GPLv2 license |
| |
| """ |
| SCTP (Stream Control Transmission Protocol). |
| """ |
| |
| from __future__ import absolute_import |
| import struct |
| |
| from scapy.compat import * |
| from scapy.volatile import RandBin |
| from scapy.config import conf |
| from scapy.packet import * |
| from scapy.fields import * |
| from scapy.layers.inet import IP |
| from scapy.layers.inet6 import IP6Field |
| from scapy.layers.inet6 import IPv6 |
| |
| IPPROTO_SCTP=132 |
| |
| # crc32-c (Castagnoli) (crc32c_poly=0x1EDC6F41) |
| crc32c_table = [ |
| 0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4, |
| 0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB, |
| 0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B, |
| 0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24, |
| 0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B, |
| 0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384, |
| 0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54, |
| 0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B, |
| 0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A, |
| 0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35, |
| 0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5, |
| 0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA, |
| 0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45, |
| 0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A, |
| 0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A, |
| 0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595, |
| 0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48, |
| 0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957, |
| 0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687, |
| 0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198, |
| 0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927, |
| 0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38, |
| 0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8, |
| 0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7, |
| 0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096, |
| 0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789, |
| 0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859, |
| 0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46, |
| 0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9, |
| 0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6, |
| 0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36, |
| 0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829, |
| 0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C, |
| 0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93, |
| 0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043, |
| 0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C, |
| 0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3, |
| 0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC, |
| 0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C, |
| 0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033, |
| 0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652, |
| 0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D, |
| 0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D, |
| 0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982, |
| 0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D, |
| 0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622, |
| 0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2, |
| 0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED, |
| 0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530, |
| 0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F, |
| 0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF, |
| 0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0, |
| 0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F, |
| 0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540, |
| 0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90, |
| 0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F, |
| 0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE, |
| 0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1, |
| 0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321, |
| 0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E, |
| 0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81, |
| 0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E, |
| 0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E, |
| 0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351, |
| ] |
| |
| def crc32c(buf): |
| crc = 0xffffffff |
| for c in buf: |
| crc = (crc>>8) ^ crc32c_table[(crc^(orb(c))) & 0xFF] |
| crc = (~crc) & 0xffffffff |
| # reverse endianness |
| return struct.unpack(">I",struct.pack("<I", crc))[0] |
| |
| # old checksum (RFC2960) |
| """ |
| BASE = 65521 # largest prime smaller than 65536 |
| def update_adler32(adler, buf): |
| s1 = adler & 0xffff |
| s2 = (adler >> 16) & 0xffff |
| print s1,s2 |
| |
| for c in buf: |
| print orb(c) |
| s1 = (s1 + orb(c)) % BASE |
| s2 = (s2 + s1) % BASE |
| print s1,s2 |
| return (s2 << 16) + s1 |
| |
| def sctp_checksum(buf): |
| return update_adler32(1, buf) |
| """ |
| |
| hmactypes = { |
| 0 : "Reserved1", |
| 1 : "SHA-1", |
| 2 : "Reserved2", |
| 3 : "SHA-256", |
| } |
| |
| sctpchunktypescls = { |
| 0 : "SCTPChunkData", |
| 1 : "SCTPChunkInit", |
| 2 : "SCTPChunkInitAck", |
| 3 : "SCTPChunkSACK", |
| 4 : "SCTPChunkHeartbeatReq", |
| 5 : "SCTPChunkHeartbeatAck", |
| 6 : "SCTPChunkAbort", |
| 7 : "SCTPChunkShutdown", |
| 8 : "SCTPChunkShutdownAck", |
| 9 : "SCTPChunkError", |
| 10 : "SCTPChunkCookieEcho", |
| 11 : "SCTPChunkCookieAck", |
| 14 : "SCTPChunkShutdownComplete", |
| 15 : "SCTPChunkAuthentication", |
| 0x80 : "SCTPChunkAddressConfAck", |
| 0xc1 : "SCTPChunkAddressConf", |
| } |
| |
| sctpchunktypes = { |
| 0 : "data", |
| 1 : "init", |
| 2 : "init-ack", |
| 3 : "sack", |
| 4 : "heartbeat-req", |
| 5 : "heartbeat-ack", |
| 6 : "abort", |
| 7 : "shutdown", |
| 8 : "shutdown-ack", |
| 9 : "error", |
| 10 : "cookie-echo", |
| 11 : "cookie-ack", |
| 14 : "shutdown-complete", |
| 15 : "authentication", |
| 0x80 : "address-configuration-ack", |
| 0xc1 : "address-configuration", |
| } |
| |
| sctpchunkparamtypescls = { |
| 1 : "SCTPChunkParamHearbeatInfo", |
| 5 : "SCTPChunkParamIPv4Addr", |
| 6 : "SCTPChunkParamIPv6Addr", |
| 7 : "SCTPChunkParamStateCookie", |
| 8 : "SCTPChunkParamUnrocognizedParam", |
| 9 : "SCTPChunkParamCookiePreservative", |
| 11 : "SCTPChunkParamHostname", |
| 12 : "SCTPChunkParamSupportedAddrTypes", |
| 0x8000 : "SCTPChunkParamECNCapable", |
| 0x8002 : "SCTPChunkParamRandom", |
| 0x8003 : "SCTPChunkParamChunkList", |
| 0x8004 : "SCTPChunkParamRequestedHMACFunctions", |
| 0x8008 : "SCTPChunkParamSupportedExtensions", |
| 0xc000 : "SCTPChunkParamFwdTSN", |
| 0xc001 : "SCTPChunkParamAddIPAddr", |
| 0xc002 : "SCTPChunkParamDelIPAddr", |
| 0xc003 : "SCTPChunkParamErrorIndication", |
| 0xc004 : "SCTPChunkParamSetPrimaryAddr", |
| 0xc005 : "SCTPChunkParamSuccessIndication", |
| 0xc006 : "SCTPChunkParamAdaptationLayer", |
| } |
| |
| sctpchunkparamtypes = { |
| 1 : "heartbeat-info", |
| 5 : "IPv4", |
| 6 : "IPv6", |
| 7 : "state-cookie", |
| 8 : "unrecognized-param", |
| 9 : "cookie-preservative", |
| 11 : "hostname", |
| 12 : "addrtypes", |
| 0x8000 : "ecn-capable", |
| 0x8002 : "random", |
| 0x8003 : "chunk-list", |
| 0x8004 : "requested-HMAC-functions", |
| 0x8008 : "supported-extensions", |
| 0xc000 : "fwd-tsn-supported", |
| 0xc001 : "add-IP", |
| 0xc002 : "del-IP", |
| 0xc003 : "error-indication", |
| 0xc004 : "set-primary-addr", |
| 0xc005 : "success-indication", |
| 0xc006 : "adaptation-layer", |
| } |
| |
| ############## SCTP header |
| |
| # Dummy class to guess payload type (variable parameters) |
| class _SCTPChunkGuessPayload: |
| def default_payload_class(self,p): |
| if len(p) < 4: |
| return conf.padding_layer |
| else: |
| t = orb(p[0]) |
| return globals().get(sctpchunktypescls.get(t, "Raw"), conf.raw_layer) |
| |
| |
| class SCTP(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ShortField("sport", None), |
| ShortField("dport", None), |
| XIntField("tag", None), |
| XIntField("chksum", None), ] |
| def answers(self, other): |
| if not isinstance(other, SCTP): |
| return 0 |
| if conf.checkIPsrc: |
| if not ((self.sport == other.dport) and |
| (self.dport == other.sport)): |
| return 0 |
| return 1 |
| def post_build(self, p, pay): |
| p += pay |
| if self.chksum is None: |
| crc = crc32c(raw(p)) |
| p = p[:8]+struct.pack(">I", crc)+p[12:] |
| return p |
| |
| ############## SCTP Chunk variable params |
| |
| class ChunkParamField(PacketListField): |
| def __init__(self, name, default, count_from=None, length_from=None): |
| PacketListField.__init__(self, name, default, conf.raw_layer, count_from=count_from, length_from=length_from) |
| def m2i(self, p, m): |
| cls = conf.raw_layer |
| if len(m) >= 4: |
| t = orb(m[0]) * 256 + orb(m[1]) |
| cls = globals().get(sctpchunkparamtypescls.get(t, "Raw"), conf.raw_layer) |
| return cls(m) |
| |
| # dummy class to avoid Raw() after Chunk params |
| class _SCTPChunkParam: |
| def extract_padding(self, s): |
| return b"",s[:] |
| |
| class SCTPChunkParamHearbeatInfo(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 1, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="data", |
| adjust = lambda pkt,x:x+4), |
| PadField(StrLenField("data", "", |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"),] |
| |
| class SCTPChunkParamIPv4Addr(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 5, sctpchunkparamtypes), |
| ShortField("len", 8), |
| IPField("addr","127.0.0.1"), ] |
| |
| class SCTPChunkParamIPv6Addr(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 6, sctpchunkparamtypes), |
| ShortField("len", 20), |
| IP6Field("addr","::1"), ] |
| |
| class SCTPChunkParamStateCookie(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 7, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="cookie", |
| adjust = lambda pkt,x:x+4), |
| PadField(StrLenField("cookie", "", |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"),] |
| |
| class SCTPChunkParamUnrocognizedParam(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 8, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="param", |
| adjust = lambda pkt,x:x+4), |
| PadField(StrLenField("param", "", |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"),] |
| |
| class SCTPChunkParamCookiePreservative(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 9, sctpchunkparamtypes), |
| ShortField("len", 8), |
| XIntField("sug_cookie_inc", None), ] |
| |
| class SCTPChunkParamHostname(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 11, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="hostname", |
| adjust = lambda pkt,x:x+4), |
| PadField(StrLenField("hostname", "", |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"), ] |
| |
| class SCTPChunkParamSupportedAddrTypes(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 12, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="addr_type_list", |
| adjust = lambda pkt,x:x+4), |
| PadField(FieldListField("addr_type_list", [ "IPv4" ], |
| ShortEnumField("addr_type", 5, sctpchunkparamtypes), |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"), ] |
| |
| class SCTPChunkParamECNCapable(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0x8000, sctpchunkparamtypes), |
| ShortField("len", 4), ] |
| |
| class SCTPChunkParamRandom(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0x8002, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="random", |
| adjust = lambda pkt,x:x+4), |
| PadField(StrLenField("random", RandBin(32), |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"),] |
| |
| class SCTPChunkParamChunkList(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0x8003, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="chunk_list", |
| adjust = lambda pkt,x:x+4), |
| PadField(FieldListField("chunk_list", None, |
| ByteEnumField("chunk", None, sctpchunktypes), |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"),] |
| |
| class SCTPChunkParamRequestedHMACFunctions(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0x8004, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="HMAC_functions_list", |
| adjust = lambda pkt,x:x+4), |
| PadField(FieldListField("HMAC_functions_list", [ "SHA-1" ], |
| ShortEnumField("HMAC_function", 1, hmactypes), |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"),] |
| |
| class SCTPChunkParamSupportedExtensions(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0x8008, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="supported_extensions", |
| adjust = lambda pkt,x:x+4), |
| PadField(FieldListField("supported_extensions", |
| [ "authentication", |
| "address-configuration", |
| "address-configuration-ack" ], |
| ByteEnumField("supported_extensions", |
| None, sctpchunktypes), |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"),] |
| |
| class SCTPChunkParamFwdTSN(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0xc000, sctpchunkparamtypes), |
| ShortField("len", 4), ] |
| |
| class SCTPChunkParamAddIPAddr(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0xc001, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="addr", |
| adjust = lambda pkt,x:x+12), |
| XIntField("correlation_id", None), |
| ShortEnumField("addr_type", 5, sctpchunkparamtypes), |
| FieldLenField("addr_len", None, length_of="addr", |
| adjust = lambda pkt,x:x+4), |
| ConditionalField( |
| IPField("addr", "127.0.0.1"), |
| lambda p: p.addr_type == 5), |
| ConditionalField( |
| IP6Field("addr", "::1"), |
| lambda p: p.addr_type == 6),] |
| |
| class SCTPChunkParamDelIPAddr(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0xc002, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="addr", |
| adjust = lambda pkt,x:x+12), |
| XIntField("correlation_id", None), |
| ShortEnumField("addr_type", 5, sctpchunkparamtypes), |
| FieldLenField("addr_len", None, length_of="addr", |
| adjust = lambda pkt,x:x+4), |
| ConditionalField( |
| IPField("addr", "127.0.0.1"), |
| lambda p: p.addr_type == 5), |
| ConditionalField( |
| IP6Field("addr", "::1"), |
| lambda p: p.addr_type == 6),] |
| |
| class SCTPChunkParamErrorIndication(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0xc003, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="error_causes", |
| adjust = lambda pkt,x:x+8), |
| XIntField("correlation_id", None), |
| PadField(StrLenField("error_causes", "", |
| length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"),] |
| |
| class SCTPChunkParamSetPrimaryAddr(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0xc004, sctpchunkparamtypes), |
| FieldLenField("len", None, length_of="addr", |
| adjust = lambda pkt,x:x+12), |
| XIntField("correlation_id", None), |
| ShortEnumField("addr_type", 5, sctpchunkparamtypes), |
| FieldLenField("addr_len", None, length_of="addr", |
| adjust = lambda pkt,x:x+4), |
| ConditionalField( |
| IPField("addr", "127.0.0.1"), |
| lambda p: p.addr_type == 5), |
| ConditionalField( |
| IP6Field("addr", "::1"), |
| lambda p: p.addr_type == 6),] |
| |
| class SCTPChunkParamSuccessIndication(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0xc005, sctpchunkparamtypes), |
| ShortField("len", 8), |
| XIntField("correlation_id", None), ] |
| |
| class SCTPChunkParamAdaptationLayer(_SCTPChunkParam, Packet): |
| fields_desc = [ ShortEnumField("type", 0xc006, sctpchunkparamtypes), |
| ShortField("len", 8), |
| XIntField("indication", None), ] |
| |
| ############## SCTP Chunks |
| |
| # Dictionary taken from: http://www.iana.org/assignments/sctp-parameters/sctp-parameters.xhtml |
| SCTP_PAYLOAD_PROTOCOL_INDENTIFIERS = { |
| 0: 'Reserved', |
| 1: 'IUA', |
| 2: 'M2UA', |
| 3: 'M3UA', |
| 4: 'SUA', |
| 5: 'M2PA', |
| 6: 'V5UA', |
| 7: 'H.248', |
| 8: 'BICC/Q.2150.3', |
| 9: 'TALI', |
| 10: 'DUA', |
| 11: 'ASAP', |
| 12: 'ENRP', |
| 13: 'H.323', |
| 14: 'Q.IPC/Q.2150.3', |
| 15: 'SIMCO', |
| 16: 'DDP Segment Chunk', |
| 17: 'DDP Stream Session Control', |
| 18: 'S1AP', |
| 19: 'RUA', |
| 20: 'HNBAP', |
| 21: 'ForCES-HP', |
| 22: 'ForCES-MP', |
| 23: 'ForCES-LP', |
| 24: 'SBc-AP', |
| 25: 'NBAP', |
| 26: 'Unassigned', |
| 27: 'X2AP', |
| 28: 'IRCP', |
| 29: 'LCS-AP', |
| 30: 'MPICH2', |
| 31: 'SABP', |
| 32: 'FGP', |
| 33: 'PPP', |
| 34: 'CALCAPP', |
| 35: 'SSP', |
| 36: 'NPMP-CONTROL', |
| 37: 'NPMP-DATA', |
| 38: 'ECHO', |
| 39: 'DISCARD', |
| 40: 'DAYTIME', |
| 41: 'CHARGEN', |
| 42: '3GPP RNA', |
| 43: '3GPP M2AP', |
| 44: '3GPP M3AP', |
| 45: 'SSH/SCTP', |
| 46: 'Diameter/SCTP', |
| 47: 'Diameter/DTLS/SCTP', |
| 48: 'R14P', |
| 49: 'Unassigned', |
| 50: 'WebRTC DCEP', |
| 51: 'WebRTC String', |
| 52: 'WebRTC Binary Partial', |
| 53: 'WebRTC Binary', |
| 54: 'WebRTC String Partial', |
| 55: '3GPP PUA', |
| 56: 'WebRTC String Empty', |
| 57: 'WebRTC Binary Empty' |
| } |
| |
| class SCTPChunkData(_SCTPChunkGuessPayload, Packet): |
| # TODO : add a padding function in post build if this layer is used to generate SCTP chunk data |
| fields_desc = [ ByteEnumField("type", 0, sctpchunktypes), |
| BitField("reserved", None, 4), |
| BitField("delay_sack", 0, 1), |
| BitField("unordered", 0, 1), |
| BitField("beginning", 0, 1), |
| BitField("ending", 0, 1), |
| FieldLenField("len", None, length_of="data", adjust = lambda pkt,x:x+16), |
| XIntField("tsn", None), |
| XShortField("stream_id", None), |
| XShortField("stream_seq", None), |
| IntEnumField("proto_id", None, SCTP_PAYLOAD_PROTOCOL_INDENTIFIERS), |
| PadField(StrLenField("data", None, length_from=lambda pkt: pkt.len-16), |
| 4, padwith=b"\x00"), |
| ] |
| |
| |
| class SCTPChunkInit(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 1, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="params", adjust = lambda pkt,x:x+20), |
| XIntField("init_tag", None), |
| IntField("a_rwnd", None), |
| ShortField("n_out_streams", None), |
| ShortField("n_in_streams", None), |
| XIntField("init_tsn", None), |
| ChunkParamField("params", None, length_from=lambda pkt:pkt.len-20), |
| ] |
| |
| class SCTPChunkInitAck(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 2, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="params", adjust = lambda pkt,x:x+20), |
| XIntField("init_tag", None), |
| IntField("a_rwnd", None), |
| ShortField("n_out_streams", None), |
| ShortField("n_in_streams", None), |
| XIntField("init_tsn", None), |
| ChunkParamField("params", None, length_from=lambda pkt:pkt.len-20), |
| ] |
| |
| class GapAckField(Field): |
| def __init__(self, name, default): |
| Field.__init__(self, name, default, "4s") |
| def i2m(self, pkt, x): |
| if x is None: |
| return b"\0\0\0\0" |
| sta, end = [int(e) for e in x.split(':')] |
| args = tuple([">HH", sta, end]) |
| return struct.pack(*args) |
| def m2i(self, pkt, x): |
| return "%d:%d"%(struct.unpack(">HH", x)) |
| def any2i(self, pkt, x): |
| if isinstance(x, tuple) and len(x) == 2: |
| return "%d:%d"%(x) |
| return x |
| |
| class SCTPChunkSACK(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 3, sctpchunktypes), |
| XByteField("flags", None), |
| ShortField("len", None), |
| XIntField("cumul_tsn_ack", None), |
| IntField("a_rwnd", None), |
| FieldLenField("n_gap_ack", None, count_of="gap_ack_list"), |
| FieldLenField("n_dup_tsn", None, count_of="dup_tsn_list"), |
| FieldListField("gap_ack_list", [ ], GapAckField("gap_ack", None), count_from=lambda pkt:pkt.n_gap_ack), |
| FieldListField("dup_tsn_list", [ ], XIntField("dup_tsn", None), count_from=lambda pkt:pkt.n_dup_tsn), |
| ] |
| |
| def post_build(self, p, pay): |
| if self.len is None: |
| p = p[:2] + struct.pack(">H", len(p)) + p[4:] |
| return p+pay |
| |
| |
| class SCTPChunkHeartbeatReq(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 4, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="params", adjust = lambda pkt,x:x+4), |
| ChunkParamField("params", None, length_from=lambda pkt:pkt.len-4), |
| ] |
| |
| class SCTPChunkHeartbeatAck(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 5, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="params", adjust = lambda pkt,x:x+4), |
| ChunkParamField("params", None, length_from=lambda pkt:pkt.len-4), |
| ] |
| |
| class SCTPChunkAbort(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 6, sctpchunktypes), |
| BitField("reserved", None, 7), |
| BitField("TCB", 0, 1), |
| FieldLenField("len", None, length_of="error_causes", adjust = lambda pkt,x:x+4), |
| PadField(StrLenField("error_causes", "", length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"), |
| ] |
| |
| class SCTPChunkShutdown(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 7, sctpchunktypes), |
| XByteField("flags", None), |
| ShortField("len", 8), |
| XIntField("cumul_tsn_ack", None), |
| ] |
| |
| class SCTPChunkShutdownAck(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 8, sctpchunktypes), |
| XByteField("flags", None), |
| ShortField("len", 4), |
| ] |
| |
| class SCTPChunkError(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 9, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="error_causes", adjust = lambda pkt,x:x+4), |
| PadField(StrLenField("error_causes", "", length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"), |
| ] |
| |
| class SCTPChunkCookieEcho(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 10, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="cookie", adjust = lambda pkt,x:x+4), |
| PadField(StrLenField("cookie", "", length_from=lambda pkt: pkt.len-4), |
| 4, padwith=b"\x00"), |
| ] |
| |
| class SCTPChunkCookieAck(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 11, sctpchunktypes), |
| XByteField("flags", None), |
| ShortField("len", 4), |
| ] |
| |
| class SCTPChunkShutdownComplete(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 14, sctpchunktypes), |
| BitField("reserved", None, 7), |
| BitField("TCB", 0, 1), |
| ShortField("len", 4), |
| ] |
| |
| class SCTPChunkAuthentication(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 15, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="HMAC", |
| adjust = lambda pkt,x:x+8), |
| ShortField("shared_key_id", None), |
| ShortField("HMAC_function", None), |
| PadField(StrLenField("HMAC", "", length_from=lambda pkt: pkt.len-8), |
| 4, padwith=b"\x00"), |
| ] |
| |
| class SCTPChunkAddressConf(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type", 0xc1, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="params", |
| adjust=lambda pkt,x:x+8), |
| IntField("seq", 0), |
| ChunkParamField("params", None, length_from=lambda pkt:pkt.len-8), |
| ] |
| |
| class SCTPChunkAddressConfAck(_SCTPChunkGuessPayload, Packet): |
| fields_desc = [ ByteEnumField("type",0x80, sctpchunktypes), |
| XByteField("flags", None), |
| FieldLenField("len", None, length_of="params", |
| adjust=lambda pkt,x:x+8), |
| IntField("seq", 0), |
| ChunkParamField("params", None, length_from=lambda pkt:pkt.len-8), |
| ] |
| |
| bind_layers( IP, SCTP, proto=IPPROTO_SCTP) |
| bind_layers( IPv6, SCTP, nh=IPPROTO_SCTP) |
