673 lines
25 KiB
Python
673 lines
25 KiB
Python
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# This file is part of Scapy
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# See http://www.secdev.org/projects/scapy for more information
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# Copyright (C) Philippe Biondi <phil@secdev.org>
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# Copyright (C) 6WIND <olivier.matz@6wind.com>
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# This program is published under a GPLv2 license
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"""
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SCTP (Stream Control Transmission Protocol).
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"""
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from __future__ import absolute_import
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import struct
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from scapy.compat import orb, raw
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from scapy.volatile import RandBin
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from scapy.config import conf
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from scapy.packet import Packet, bind_layers
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from scapy.fields import BitField, ByteEnumField, ConditionalField, Field, \
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FieldLenField, FieldListField, IPField, IntEnumField, IntField, \
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PacketListField, PadField, ShortEnumField, ShortField, StrLenField, \
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XByteField, XIntField, XShortField
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from scapy.layers.inet import IP
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from scapy.layers.inet6 import IP6Field
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from scapy.layers.inet6 import IPv6
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IPPROTO_SCTP = 132
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# crc32-c (Castagnoli) (crc32c_poly=0x1EDC6F41)
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crc32c_table = [
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0x00000000, 0xF26B8303, 0xE13B70F7, 0x1350F3F4,
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0xC79A971F, 0x35F1141C, 0x26A1E7E8, 0xD4CA64EB,
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0x8AD958CF, 0x78B2DBCC, 0x6BE22838, 0x9989AB3B,
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0x4D43CFD0, 0xBF284CD3, 0xAC78BF27, 0x5E133C24,
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0x105EC76F, 0xE235446C, 0xF165B798, 0x030E349B,
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0xD7C45070, 0x25AFD373, 0x36FF2087, 0xC494A384,
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0x9A879FA0, 0x68EC1CA3, 0x7BBCEF57, 0x89D76C54,
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0x5D1D08BF, 0xAF768BBC, 0xBC267848, 0x4E4DFB4B,
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0x20BD8EDE, 0xD2D60DDD, 0xC186FE29, 0x33ED7D2A,
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0xE72719C1, 0x154C9AC2, 0x061C6936, 0xF477EA35,
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0xAA64D611, 0x580F5512, 0x4B5FA6E6, 0xB93425E5,
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0x6DFE410E, 0x9F95C20D, 0x8CC531F9, 0x7EAEB2FA,
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0x30E349B1, 0xC288CAB2, 0xD1D83946, 0x23B3BA45,
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0xF779DEAE, 0x05125DAD, 0x1642AE59, 0xE4292D5A,
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0xBA3A117E, 0x4851927D, 0x5B016189, 0xA96AE28A,
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0x7DA08661, 0x8FCB0562, 0x9C9BF696, 0x6EF07595,
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0x417B1DBC, 0xB3109EBF, 0xA0406D4B, 0x522BEE48,
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0x86E18AA3, 0x748A09A0, 0x67DAFA54, 0x95B17957,
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0xCBA24573, 0x39C9C670, 0x2A993584, 0xD8F2B687,
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0x0C38D26C, 0xFE53516F, 0xED03A29B, 0x1F682198,
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0x5125DAD3, 0xA34E59D0, 0xB01EAA24, 0x42752927,
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0x96BF4DCC, 0x64D4CECF, 0x77843D3B, 0x85EFBE38,
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0xDBFC821C, 0x2997011F, 0x3AC7F2EB, 0xC8AC71E8,
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0x1C661503, 0xEE0D9600, 0xFD5D65F4, 0x0F36E6F7,
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0x61C69362, 0x93AD1061, 0x80FDE395, 0x72966096,
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0xA65C047D, 0x5437877E, 0x4767748A, 0xB50CF789,
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0xEB1FCBAD, 0x197448AE, 0x0A24BB5A, 0xF84F3859,
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0x2C855CB2, 0xDEEEDFB1, 0xCDBE2C45, 0x3FD5AF46,
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0x7198540D, 0x83F3D70E, 0x90A324FA, 0x62C8A7F9,
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0xB602C312, 0x44694011, 0x5739B3E5, 0xA55230E6,
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0xFB410CC2, 0x092A8FC1, 0x1A7A7C35, 0xE811FF36,
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0x3CDB9BDD, 0xCEB018DE, 0xDDE0EB2A, 0x2F8B6829,
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0x82F63B78, 0x709DB87B, 0x63CD4B8F, 0x91A6C88C,
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0x456CAC67, 0xB7072F64, 0xA457DC90, 0x563C5F93,
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0x082F63B7, 0xFA44E0B4, 0xE9141340, 0x1B7F9043,
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0xCFB5F4A8, 0x3DDE77AB, 0x2E8E845F, 0xDCE5075C,
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0x92A8FC17, 0x60C37F14, 0x73938CE0, 0x81F80FE3,
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0x55326B08, 0xA759E80B, 0xB4091BFF, 0x466298FC,
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0x1871A4D8, 0xEA1A27DB, 0xF94AD42F, 0x0B21572C,
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0xDFEB33C7, 0x2D80B0C4, 0x3ED04330, 0xCCBBC033,
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0xA24BB5A6, 0x502036A5, 0x4370C551, 0xB11B4652,
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0x65D122B9, 0x97BAA1BA, 0x84EA524E, 0x7681D14D,
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0x2892ED69, 0xDAF96E6A, 0xC9A99D9E, 0x3BC21E9D,
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0xEF087A76, 0x1D63F975, 0x0E330A81, 0xFC588982,
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0xB21572C9, 0x407EF1CA, 0x532E023E, 0xA145813D,
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0x758FE5D6, 0x87E466D5, 0x94B49521, 0x66DF1622,
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0x38CC2A06, 0xCAA7A905, 0xD9F75AF1, 0x2B9CD9F2,
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0xFF56BD19, 0x0D3D3E1A, 0x1E6DCDEE, 0xEC064EED,
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0xC38D26C4, 0x31E6A5C7, 0x22B65633, 0xD0DDD530,
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0x0417B1DB, 0xF67C32D8, 0xE52CC12C, 0x1747422F,
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0x49547E0B, 0xBB3FFD08, 0xA86F0EFC, 0x5A048DFF,
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0x8ECEE914, 0x7CA56A17, 0x6FF599E3, 0x9D9E1AE0,
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0xD3D3E1AB, 0x21B862A8, 0x32E8915C, 0xC083125F,
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0x144976B4, 0xE622F5B7, 0xF5720643, 0x07198540,
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0x590AB964, 0xAB613A67, 0xB831C993, 0x4A5A4A90,
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0x9E902E7B, 0x6CFBAD78, 0x7FAB5E8C, 0x8DC0DD8F,
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0xE330A81A, 0x115B2B19, 0x020BD8ED, 0xF0605BEE,
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0x24AA3F05, 0xD6C1BC06, 0xC5914FF2, 0x37FACCF1,
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0x69E9F0D5, 0x9B8273D6, 0x88D28022, 0x7AB90321,
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0xAE7367CA, 0x5C18E4C9, 0x4F48173D, 0xBD23943E,
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0xF36E6F75, 0x0105EC76, 0x12551F82, 0xE03E9C81,
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0x34F4F86A, 0xC69F7B69, 0xD5CF889D, 0x27A40B9E,
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0x79B737BA, 0x8BDCB4B9, 0x988C474D, 0x6AE7C44E,
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0xBE2DA0A5, 0x4C4623A6, 0x5F16D052, 0xAD7D5351,
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]
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def crc32c(buf):
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crc = 0xffffffff
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for c in buf:
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crc = (crc >> 8) ^ crc32c_table[(crc ^ (orb(c))) & 0xFF]
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crc = (~crc) & 0xffffffff
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# reverse endianness
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return struct.unpack(">I", struct.pack("<I", crc))[0]
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# old checksum (RFC2960)
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"""
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BASE = 65521 # largest prime smaller than 65536
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def update_adler32(adler, buf):
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s1 = adler & 0xffff
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s2 = (adler >> 16) & 0xffff
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print s1,s2
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for c in buf:
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print orb(c)
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s1 = (s1 + orb(c)) % BASE
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s2 = (s2 + s1) % BASE
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print s1,s2
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return (s2 << 16) + s1
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def sctp_checksum(buf):
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return update_adler32(1, buf)
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"""
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hmactypes = {
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0: "Reserved1",
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1: "SHA-1",
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2: "Reserved2",
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3: "SHA-256",
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}
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sctpchunktypescls = {
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0: "SCTPChunkData",
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1: "SCTPChunkInit",
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2: "SCTPChunkInitAck",
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3: "SCTPChunkSACK",
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4: "SCTPChunkHeartbeatReq",
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5: "SCTPChunkHeartbeatAck",
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6: "SCTPChunkAbort",
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7: "SCTPChunkShutdown",
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8: "SCTPChunkShutdownAck",
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9: "SCTPChunkError",
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10: "SCTPChunkCookieEcho",
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11: "SCTPChunkCookieAck",
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14: "SCTPChunkShutdownComplete",
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15: "SCTPChunkAuthentication",
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0x80: "SCTPChunkAddressConfAck",
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0xc1: "SCTPChunkAddressConf",
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}
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sctpchunktypes = {
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0: "data",
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1: "init",
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2: "init-ack",
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3: "sack",
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4: "heartbeat-req",
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5: "heartbeat-ack",
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6: "abort",
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7: "shutdown",
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8: "shutdown-ack",
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9: "error",
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10: "cookie-echo",
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11: "cookie-ack",
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14: "shutdown-complete",
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15: "authentication",
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0x80: "address-configuration-ack",
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0xc1: "address-configuration",
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}
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sctpchunkparamtypescls = {
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1: "SCTPChunkParamHearbeatInfo",
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5: "SCTPChunkParamIPv4Addr",
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6: "SCTPChunkParamIPv6Addr",
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7: "SCTPChunkParamStateCookie",
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8: "SCTPChunkParamUnrocognizedParam",
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9: "SCTPChunkParamCookiePreservative",
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11: "SCTPChunkParamHostname",
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12: "SCTPChunkParamSupportedAddrTypes",
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0x8000: "SCTPChunkParamECNCapable",
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0x8002: "SCTPChunkParamRandom",
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0x8003: "SCTPChunkParamChunkList",
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0x8004: "SCTPChunkParamRequestedHMACFunctions",
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0x8008: "SCTPChunkParamSupportedExtensions",
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0xc000: "SCTPChunkParamFwdTSN",
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0xc001: "SCTPChunkParamAddIPAddr",
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0xc002: "SCTPChunkParamDelIPAddr",
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0xc003: "SCTPChunkParamErrorIndication",
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0xc004: "SCTPChunkParamSetPrimaryAddr",
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0xc005: "SCTPChunkParamSuccessIndication",
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0xc006: "SCTPChunkParamAdaptationLayer",
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}
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sctpchunkparamtypes = {
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1: "heartbeat-info",
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5: "IPv4",
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6: "IPv6",
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7: "state-cookie",
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8: "unrecognized-param",
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9: "cookie-preservative",
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11: "hostname",
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12: "addrtypes",
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0x8000: "ecn-capable",
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0x8002: "random",
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0x8003: "chunk-list",
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0x8004: "requested-HMAC-functions",
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0x8008: "supported-extensions",
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0xc000: "fwd-tsn-supported",
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0xc001: "add-IP",
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0xc002: "del-IP",
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0xc003: "error-indication",
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0xc004: "set-primary-addr",
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0xc005: "success-indication",
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0xc006: "adaptation-layer",
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}
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# SCTP header
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# Dummy class to guess payload type (variable parameters)
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class _SCTPChunkGuessPayload:
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def default_payload_class(self, p):
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if len(p) < 4:
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return conf.padding_layer
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else:
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t = orb(p[0])
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return globals().get(sctpchunktypescls.get(t, "Raw"), conf.raw_layer) # noqa: E501
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class SCTP(_SCTPChunkGuessPayload, Packet):
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fields_desc = [ShortField("sport", None),
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ShortField("dport", None),
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XIntField("tag", None),
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XIntField("chksum", None), ]
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def answers(self, other):
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if not isinstance(other, SCTP):
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return 0
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if conf.checkIPsrc:
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if not ((self.sport == other.dport) and
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(self.dport == other.sport)):
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return 0
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return 1
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def post_build(self, p, pay):
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p += pay
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if self.chksum is None:
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crc = crc32c(raw(p))
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p = p[:8] + struct.pack(">I", crc) + p[12:]
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return p
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# SCTP Chunk variable params
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class ChunkParamField(PacketListField):
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def __init__(self, name, default, count_from=None, length_from=None):
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PacketListField.__init__(self, name, default, conf.raw_layer, count_from=count_from, length_from=length_from) # noqa: E501
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def m2i(self, p, m):
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cls = conf.raw_layer
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if len(m) >= 4:
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t = orb(m[0]) * 256 + orb(m[1])
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cls = globals().get(sctpchunkparamtypescls.get(t, "Raw"), conf.raw_layer) # noqa: E501
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return cls(m)
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# dummy class to avoid Raw() after Chunk params
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class _SCTPChunkParam:
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def extract_padding(self, s):
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return b"", s[:]
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class SCTPChunkParamHearbeatInfo(_SCTPChunkParam, Packet):
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fields_desc = [ShortEnumField("type", 1, sctpchunkparamtypes),
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FieldLenField("len", None, length_of="data",
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adjust=lambda pkt, x:x + 4),
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PadField(StrLenField("data", "",
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length_from=lambda pkt: pkt.len - 4),
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4, padwith=b"\x00"), ]
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class SCTPChunkParamIPv4Addr(_SCTPChunkParam, Packet):
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fields_desc = [ShortEnumField("type", 5, sctpchunkparamtypes),
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ShortField("len", 8),
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IPField("addr", "127.0.0.1"), ]
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class SCTPChunkParamIPv6Addr(_SCTPChunkParam, Packet):
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fields_desc = [ShortEnumField("type", 6, sctpchunkparamtypes),
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ShortField("len", 20),
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IP6Field("addr", "::1"), ]
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class SCTPChunkParamStateCookie(_SCTPChunkParam, Packet):
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fields_desc = [ShortEnumField("type", 7, sctpchunkparamtypes),
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FieldLenField("len", None, length_of="cookie",
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adjust=lambda pkt, x:x + 4),
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PadField(StrLenField("cookie", "",
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|
|
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), # noqa: E501
|
||
|
|
length_from=lambda pkt: pkt.len - 4), # noqa: E501
|
||
|
|
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), # noqa: E501
|
||
|
|
length_from=lambda pkt: pkt.len - 4), # noqa: E501
|
||
|
|
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), # noqa: E501
|
||
|
|
length_from=lambda pkt: pkt.len - 4), # noqa: E501
|
||
|
|
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", # noqa: E501
|
||
|
|
None, sctpchunktypes),
|
||
|
|
length_from=lambda pkt: pkt.len - 4), # noqa: E501
|
||
|
|
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(SCTPChunkParamAddIPAddr):
|
||
|
|
type = 0xc002
|
||
|
|
|
||
|
|
|
||
|
|
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(SCTPChunkParamAddIPAddr):
|
||
|
|
type = 0xc004
|
||
|
|
|
||
|
|
|
||
|
|
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 # noqa: E501
|
||
|
|
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 # noqa: E501
|
||
|
|
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), # noqa: E501
|
||
|
|
XIntField("tsn", None),
|
||
|
|
XShortField("stream_id", None),
|
||
|
|
XShortField("stream_seq", None),
|
||
|
|
IntEnumField("proto_id", None, SCTP_PAYLOAD_PROTOCOL_INDENTIFIERS), # noqa: E501
|
||
|
|
PadField(StrLenField("data", None, length_from=lambda pkt: pkt.len - 16), # noqa: E501
|
||
|
|
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), # noqa: E501
|
||
|
|
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), # noqa: E501
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
class SCTPChunkInitAck(SCTPChunkInit):
|
||
|
|
type = 2
|
||
|
|
|
||
|
|
|
||
|
|
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), # noqa: E501
|
||
|
|
FieldListField("dup_tsn_list", [], XIntField("dup_tsn", None), count_from=lambda pkt:pkt.n_dup_tsn), # noqa: E501
|
||
|
|
]
|
||
|
|
|
||
|
|
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), # noqa: E501
|
||
|
|
ChunkParamField("params", None, length_from=lambda pkt:pkt.len - 4), # noqa: E501
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
class SCTPChunkHeartbeatAck(SCTPChunkHeartbeatReq):
|
||
|
|
type = 5
|
||
|
|
|
||
|
|
|
||
|
|
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), # noqa: E501
|
||
|
|
PadField(StrLenField("error_causes", "", length_from=lambda pkt: pkt.len - 4), # noqa: E501
|
||
|
|
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), # noqa: E501
|
||
|
|
PadField(StrLenField("error_causes", "", length_from=lambda pkt: pkt.len - 4), # noqa: E501
|
||
|
|
4, padwith=b"\x00"),
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
class SCTPChunkCookieEcho(SCTPChunkError):
|
||
|
|
fields_desc = [ByteEnumField("type", 10, sctpchunktypes),
|
||
|
|
XByteField("flags", None),
|
||
|
|
FieldLenField("len", None, length_of="cookie", adjust=lambda pkt, x:x + 4), # noqa: E501
|
||
|
|
PadField(StrLenField("cookie", "", length_from=lambda pkt: pkt.len - 4), # noqa: E501
|
||
|
|
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), # noqa: E501
|
||
|
|
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), # noqa: E501
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
class SCTPChunkAddressConfAck(SCTPChunkAddressConf):
|
||
|
|
type = 0x80
|
||
|
|
|
||
|
|
|
||
|
|
bind_layers(IP, SCTP, proto=IPPROTO_SCTP)
|
||
|
|
bind_layers(IPv6, SCTP, nh=IPPROTO_SCTP)
|