| 1 | #!/usr/bin/env python |
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| 2 | # -*- coding: utf-8 -*- |
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| 3 | |
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| 4 | # Copyright (C) 2008 Adriano Monteiro Marques. |
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| 5 | # |
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| 6 | # Author: Bartosz SKOWRON <getxsick at gmail dot com> |
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| 7 | # |
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| 8 | # This library is free software; you can redistribute it and/or modify |
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| 9 | # it under the terms of the GNU Lesser General Public License as published |
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| 10 | # by the Free Software Foundation; either version 2.1 of the License, or |
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| 11 | # (at your option) any later version. |
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| 12 | # |
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| 13 | # This library is distributed in the hope that it will be useful, but |
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| 14 | # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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| 15 | # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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| 16 | # License for more details. |
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| 17 | # |
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| 18 | # You should have received a copy of the GNU Lesser General Public License |
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| 19 | # along with this library; if not, write to the Free Software Foundation, |
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| 20 | # Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 21 | |
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| 22 | import umpa.protocols._consts as const |
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| 23 | |
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| 24 | from umpa.protocols import * |
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| 25 | from umpa.protocols._layer4 import * |
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| 26 | from umpa.utils import net |
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| 27 | from umpa.utils import bits |
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| 28 | |
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| 29 | class HPort(EnumField): |
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| 30 | bits = 16 |
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| 31 | auto = False |
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| 32 | enumerable = { |
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| 33 | "TCPMUX" : const.PORT_TCP_TCPMUX, |
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| 34 | "ECHO" : const.PORT_TCP_ECHO, |
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| 35 | "DISCARD" : const.PORT_TCP_DISCARD, |
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| 36 | "SYSTAT" : const.PORT_TCP_SYSTAT, |
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| 37 | "DAYTIME" : const.PORT_TCP_DAYTIME, |
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| 38 | "NETSTAT" : const.PORT_TCP_NETSTAT, |
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| 39 | "QOTD" : const.PORT_TCP_QOTD, |
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| 40 | "MSP" : const.PORT_TCP_MSP, |
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| 41 | "CHARGEN" : const.PORT_TCP_CHARGEN, |
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| 42 | "DATA" : const.PORT_TCP_DATA, |
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| 43 | "FTP" : const.PORT_TCP_FTP, |
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| 44 | "SSH" : const.PORT_TCP_SSH, |
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| 45 | "TELNET" : const.PORT_TCP_TELNET, |
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| 46 | "SMTP" : const.PORT_TCP_SMTP, |
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| 47 | "TIME" : const.PORT_TCP_TIME, |
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| 48 | "NAMESERVER" : const.PORT_TCP_NAMESERVER, |
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| 49 | "WHOIS" : const.PORT_TCP_WHOIS, |
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| 50 | "TACACS" : const.PORT_TCP_TACACS, |
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| 51 | "CK" : const.PORT_TCP_CK, |
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| 52 | "DOMAIN" : const.PORT_TCP_DOMAIN, |
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| 53 | "MTP" : const.PORT_TCP_MTP, |
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| 54 | "DS" : const.PORT_TCP_DS, |
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| 55 | "BOOTPS" : const.PORT_TCP_BOOTPS, |
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| 56 | "BOOTPC" : const.PORT_TCP_BOOTPC, |
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| 57 | "GOPHER" : const.PORT_TCP_GOPHER, |
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| 58 | "RJE" : const.PORT_TCP_RJE, |
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| 59 | "FINGER" : const.PORT_TCP_FINGER, |
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| 60 | "WWW" : const.PORT_TCP_WWW, |
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| 61 | "LINK" : const.PORT_TCP_LINK, |
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| 62 | "KERBEROS" : const.PORT_TCP_KERBEROS, |
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| 63 | "SUPDUP" : const.PORT_TCP_SUPDUP, |
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| 64 | "HOSTNAMES" : const.PORT_TCP_HOSTNAMES, |
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| 65 | "TSAP" : const.PORT_TCP_TSAP, |
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| 66 | "NEMA" : const.PORT_TCP_NEMA, |
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| 67 | "NS" : const.PORT_TCP_NS, |
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| 68 | "RTELNET" : const.PORT_TCP_RTELNET, |
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| 69 | "POP2" : const.PORT_TCP_POP2, |
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| 70 | "POP3" : const.PORT_TCP_POP3, |
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| 71 | "SUNRPC" : const.PORT_TCP_SUNRPC, |
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| 72 | "AUTH" : const.PORT_TCP_AUTH, |
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| 73 | "SFTP" : const.PORT_TCP_SFTP, |
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| 74 | "PATH" : const.PORT_TCP_PATH, |
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| 75 | "NNTP" : const.PORT_TCP_NNTP, |
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| 76 | "NTP" : const.PORT_TCP_NTP, |
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| 77 | "PWDGEN" : const.PORT_TCP_PWDGEN, |
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| 78 | "SRV" : const.PORT_TCP_SRV, |
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| 79 | "NS" : const.PORT_TCP_NS, |
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| 80 | "DGM" : const.PORT_TCP_DGM, |
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| 81 | "SSN" : const.PORT_TCP_SSN, |
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| 82 | "IMAP2" : const.PORT_TCP_IMAP2, |
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| 83 | "SNMP" : const.PORT_TCP_SNMP, |
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| 84 | "TRAP" : const.PORT_TCP_TRAP, |
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| 85 | "MAN" : const.PORT_TCP_MAN, |
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| 86 | "AGENT" : const.PORT_TCP_AGENT, |
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| 87 | "MAILQ" : const.PORT_TCP_MAILQ, |
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| 88 | "XDMCP" : const.PORT_TCP_XDMCP, |
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| 89 | "NEXTSTEP" : const.PORT_TCP_NEXTSTEP, |
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| 90 | "BGP" : const.PORT_TCP_BGP, |
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| 91 | "PROSPERO" : const.PORT_TCP_PROSPERO, |
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| 92 | "IRC" : const.PORT_TCP_IRC, |
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| 93 | "SMUX" : const.PORT_TCP_SMUX, |
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| 94 | "RTMP" : const.PORT_TCP_RTMP, |
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| 95 | "NBP" : const.PORT_TCP_NBP, |
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| 96 | "ECHO" : const.PORT_TCP_ECHO, |
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| 97 | "ZIS" : const.PORT_TCP_ZIS, |
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| 98 | "QMTP" : const.PORT_TCP_QMTP, |
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| 99 | "Z3950" : const.PORT_TCP_Z3950, |
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| 100 | "IPX" : const.PORT_TCP_IPX, |
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| 101 | "IMAP3" : const.PORT_TCP_IMAP3, |
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| 102 | "PAWSERV" : const.PORT_TCP_PAWSERV, |
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| 103 | "ZSERV" : const.PORT_TCP_ZSERV, |
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| 104 | "FATSERV" : const.PORT_TCP_FATSERV, |
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| 105 | "RPC2PORTMAP" : const.PORT_TCP_RPC2PORTMAP, |
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| 106 | "CODAAUTH2" : const.PORT_TCP_CODAAUTH2, |
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| 107 | "CLEARCASE" : const.PORT_TCP_CLEARCASE, |
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| 108 | "ULISTSERV" : const.PORT_TCP_ULISTSERV, |
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| 109 | "LDAP" : const.PORT_TCP_LDAP, |
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| 110 | "IMSP" : const.PORT_TCP_IMSP, |
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| 111 | "HTTPS" : const.PORT_TCP_HTTPS, |
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| 112 | "SNPP" : const.PORT_TCP_SNPP, |
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| 113 | "DS" : const.PORT_TCP_DS, |
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| 114 | "KPASSWD" : const.PORT_TCP_KPASSWD, |
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| 115 | "SAFT" : const.PORT_TCP_SAFT, |
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| 116 | "ISAKMP" : const.PORT_TCP_ISAKMP, |
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| 117 | "RTSP" : const.PORT_TCP_RTSP, |
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| 118 | "NQS" : const.PORT_TCP_NQS, |
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| 119 | "LOCAL" : const.PORT_TCP_LOCAL, |
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| 120 | "GUI" : const.PORT_TCP_GUI, |
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| 121 | "IND" : const.PORT_TCP_IND, |
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| 122 | "IPP" : const.PORT_TCP_IPP, |
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| 123 | "EXEC" : const.PORT_TCP_EXEC, |
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| 124 | "LOGIN" : const.PORT_TCP_LOGIN, |
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| 125 | "SHELL" : const.PORT_TCP_SHELL, |
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| 126 | "PRINTER" : const.PORT_TCP_PRINTER, |
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| 127 | "TEMPO" : const.PORT_TCP_TEMPO, |
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| 128 | "COURIER" : const.PORT_TCP_COURIER, |
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| 129 | "CONFERENCE" : const.PORT_TCP_CONFERENCE, |
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| 130 | "NETNEWS" : const.PORT_TCP_NETNEWS, |
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| 131 | "GDOMAP" : const.PORT_TCP_GDOMAP, |
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| 132 | "UUCP" : const.PORT_TCP_UUCP, |
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| 133 | "KLOGIN" : const.PORT_TCP_KLOGIN, |
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| 134 | "KSHELL" : const.PORT_TCP_KSHELL, |
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| 135 | "AFPOVERTCP" : const.PORT_TCP_AFPOVERTCP, |
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| 136 | "REMOTEFS" : const.PORT_TCP_REMOTEFS, |
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| 137 | "NNTPS" : const.PORT_TCP_NNTPS, |
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| 138 | "SUBMISSION" : const.PORT_TCP_SUBMISSION, |
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| 139 | "LDAPS" : const.PORT_TCP_LDAPS, |
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| 140 | "TINC" : const.PORT_TCP_TINC, |
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| 141 | "SILC" : const.PORT_TCP_SILC, |
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| 142 | "ADM" : const.PORT_TCP_ADM, |
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| 143 | "WEBSTER" : const.PORT_TCP_WEBSTER, |
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| 144 | "RSYNC" : const.PORT_TCP_RSYNC, |
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| 145 | "DATA" : const.PORT_TCP_DATA, |
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| 146 | "FTPS" : const.PORT_TCP_FTPS, |
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| 147 | "TELNETS" : const.PORT_TCP_TELNETS, |
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| 148 | "IMAPS" : const.PORT_TCP_IMAPS, |
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| 149 | "IRCS" : const.PORT_TCP_IRCS, |
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| 150 | "POP3S" : const.PORT_TCP_POP3S, |
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| 151 | "SOCKS" : const.PORT_TCP_SOCKS, |
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| 152 | "PROOFD" : const.PORT_TCP_PROOFD, |
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| 153 | "ROOTD" : const.PORT_TCP_ROOTD, |
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| 154 | "OPENVPN" : const.PORT_TCP_OPENVPN, |
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| 155 | "RMIREGISTRY" : const.PORT_TCP_RMIREGISTRY, |
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| 156 | "KAZAA" : const.PORT_TCP_KAZAA, |
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| 157 | "NESSUS" : const.PORT_TCP_NESSUS, |
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| 158 | "LOTUSNOTE" : const.PORT_TCP_LOTUSNOTE, |
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| 159 | "S" : const.PORT_TCP_S, |
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| 160 | "M" : const.PORT_TCP_M, |
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| 161 | "INGRESLOCK" : const.PORT_TCP_INGRESLOCK, |
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| 162 | "NP" : const.PORT_TCP_NP, |
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| 163 | "DATAMETRICS" : const.PORT_TCP_DATAMETRICS, |
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| 164 | "PORT" : const.PORT_TCP_PORT, |
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| 165 | "KERMIT" : const.PORT_TCP_KERMIT, |
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| 166 | "L2F" : const.PORT_TCP_L2F, |
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| 167 | "RADIUS" : const.PORT_TCP_RADIUS, |
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| 168 | "ACCT" : const.PORT_TCP_ACCT, |
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| 169 | "MSNP" : const.PORT_TCP_MSNP, |
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| 170 | "STATUS" : const.PORT_TCP_STATUS, |
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| 171 | "SERVER" : const.PORT_TCP_SERVER, |
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| 172 | "REMOTEPING" : const.PORT_TCP_REMOTEPING, |
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| 173 | "NFS" : const.PORT_TCP_NFS, |
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| 174 | "SC104" : const.PORT_TCP_SC104, |
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| 175 | "CVSPSERVER" : const.PORT_TCP_CVSPSERVER, |
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| 176 | "VENUS" : const.PORT_TCP_VENUS, |
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| 177 | "SE" : const.PORT_TCP_SE, |
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| 178 | "CODASRV" : const.PORT_TCP_CODASRV, |
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| 179 | "SE" : const.PORT_TCP_SE, |
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| 180 | "MON" : const.PORT_TCP_MON, |
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| 181 | "DICT" : const.PORT_TCP_DICT, |
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| 182 | "GPSD" : const.PORT_TCP_GPSD, |
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| 183 | "GDS_DB" : const.PORT_TCP_GDS_DB, |
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| 184 | "ICPV2" : const.PORT_TCP_ICPV2, |
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| 185 | "MYSQL" : const.PORT_TCP_MYSQL, |
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| 186 | "NUT" : const.PORT_TCP_NUT, |
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| 187 | "DISTCC" : const.PORT_TCP_DISTCC, |
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| 188 | "DAAP" : const.PORT_TCP_DAAP, |
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| 189 | "SVN" : const.PORT_TCP_SVN, |
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| 190 | "SUUCP" : const.PORT_TCP_SUUCP, |
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| 191 | "SYSRQD" : const.PORT_TCP_SYSRQD, |
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| 192 | "IAX" : const.PORT_TCP_IAX, |
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| 193 | "PORT" : const.PORT_TCP_PORT, |
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| 194 | "RFE" : const.PORT_TCP_RFE, |
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| 195 | "MMCC" : const.PORT_TCP_MMCC, |
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| 196 | "SIP" : const.PORT_TCP_SIP, |
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| 197 | "TLS" : const.PORT_TCP_TLS, |
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| 198 | "AOL" : const.PORT_TCP_AOL, |
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| 199 | "CLIENT" : const.PORT_TCP_CLIENT, |
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| 200 | "SERVER" : const.PORT_TCP_SERVER, |
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| 201 | "CFENGINE" : const.PORT_TCP_CFENGINE, |
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| 202 | "MDNS" : const.PORT_TCP_MDNS, |
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| 203 | "POSTGRESQL" : const.PORT_TCP_POSTGRESQL, |
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| 204 | "GGZ" : const.PORT_TCP_GGZ, |
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| 205 | "X11" : const.PORT_TCP_X11, |
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| 206 | "1" : const.PORT_TCP_1, |
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| 207 | "2" : const.PORT_TCP_2, |
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| 208 | "3" : const.PORT_TCP_3, |
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| 209 | "4" : const.PORT_TCP_4, |
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| 210 | "5" : const.PORT_TCP_5, |
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| 211 | "6" : const.PORT_TCP_6, |
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| 212 | "7" : const.PORT_TCP_7, |
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| 213 | "SVC" : const.PORT_TCP_SVC, |
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| 214 | "RTR" : const.PORT_TCP_RTR, |
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| 215 | "SGE_QMASTER" : const.PORT_TCP_SGE_QMASTER, |
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| 216 | "SGE_EXECD" : const.PORT_TCP_SGE_EXECD, |
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| 217 | "FILESERVER" : const.PORT_TCP_FILESERVER, |
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| 218 | "CALLBACK" : const.PORT_TCP_CALLBACK, |
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| 219 | "PRSERVER" : const.PORT_TCP_PRSERVER, |
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| 220 | "VLSERVER" : const.PORT_TCP_VLSERVER, |
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| 221 | "KASERVER" : const.PORT_TCP_KASERVER, |
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| 222 | "VOLSER" : const.PORT_TCP_VOLSER, |
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| 223 | "ERRORS" : const.PORT_TCP_ERRORS, |
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| 224 | "BOS" : const.PORT_TCP_BOS, |
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| 225 | "UPDATE" : const.PORT_TCP_UPDATE, |
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| 226 | "RMTSYS" : const.PORT_TCP_RMTSYS, |
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| 227 | "SERVICE" : const.PORT_TCP_SERVICE, |
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| 228 | "DIR" : const.PORT_TCP_DIR, |
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| 229 | "FD" : const.PORT_TCP_FD, |
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| 230 | "SD" : const.PORT_TCP_SD, |
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| 231 | "AMANDA" : const.PORT_TCP_AMANDA, |
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| 232 | "HKP" : const.PORT_TCP_HKP, |
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| 233 | "BPRD" : const.PORT_TCP_BPRD, |
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| 234 | "BPDBM" : const.PORT_TCP_BPDBM, |
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| 235 | "MSVC" : const.PORT_TCP_MSVC, |
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| 236 | "VNETD" : const.PORT_TCP_VNETD, |
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| 237 | "BPCD" : const.PORT_TCP_BPCD, |
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| 238 | "VOPIED" : const.PORT_TCP_VOPIED, |
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| 239 | "WNN6" : const.PORT_TCP_WNN6, |
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| 240 | "KERBEROS4" : const.PORT_TCP_KERBEROS4, |
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| 241 | "KERBEROS_MASTER" : const.PORT_TCP_KERBEROS_MASTER, |
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| 242 | "KRB_PROP" : const.PORT_TCP_KRB_PROP, |
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| 243 | "KRBUPDATE" : const.PORT_TCP_KRBUPDATE, |
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| 244 | "SWAT" : const.PORT_TCP_SWAT, |
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| 245 | "KPOP" : const.PORT_TCP_KPOP, |
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| 246 | "KNETD" : const.PORT_TCP_KNETD, |
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| 247 | "EKLOGIN" : const.PORT_TCP_EKLOGIN, |
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| 248 | "KX" : const.PORT_TCP_KX, |
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| 249 | "IPROP" : const.PORT_TCP_IPROP, |
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| 250 | "SUPFILESRV" : const.PORT_TCP_SUPFILESRV, |
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| 251 | "SUPFILEDBG" : const.PORT_TCP_SUPFILEDBG, |
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| 252 | "LINUXCONF" : const.PORT_TCP_LINUXCONF, |
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| 253 | "POPPASSD" : const.PORT_TCP_POPPASSD, |
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| 254 | "SSMTP" : const.PORT_TCP_SSMTP, |
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| 255 | "MOIRA_DB" : const.PORT_TCP_MOIRA_DB, |
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| 256 | "MOIRA_UPDATE" : const.PORT_TCP_MOIRA_UPDATE, |
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| 257 | "SPAMD" : const.PORT_TCP_SPAMD, |
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| 258 | "OMIRR" : const.PORT_TCP_OMIRR, |
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| 259 | "CUSTOMS" : const.PORT_TCP_CUSTOMS, |
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| 260 | "SKKSERV" : const.PORT_TCP_SKKSERV, |
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| 261 | "RMTCFG" : const.PORT_TCP_RMTCFG, |
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| 262 | "WIPLD" : const.PORT_TCP_WIPLD, |
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| 263 | "XTEL" : const.PORT_TCP_XTEL, |
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| 264 | "XTELW" : const.PORT_TCP_XTELW, |
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| 265 | "SUPPORT" : const.PORT_TCP_SUPPORT, |
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| 266 | "SIEVE" : const.PORT_TCP_SIEVE, |
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| 267 | "CFINGER" : const.PORT_TCP_CFINGER, |
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| 268 | "NDTP" : const.PORT_TCP_NDTP, |
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| 269 | "FROX" : const.PORT_TCP_FROX, |
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| 270 | "NINSTALL" : const.PORT_TCP_NINSTALL, |
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| 271 | "ZEBRASRV" : const.PORT_TCP_ZEBRASRV, |
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| 272 | "ZEBRA" : const.PORT_TCP_ZEBRA, |
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| 273 | "RIPD" : const.PORT_TCP_RIPD, |
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| 274 | "RIPNGD" : const.PORT_TCP_RIPNGD, |
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| 275 | "OSPFD" : const.PORT_TCP_OSPFD, |
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| 276 | "BGPD" : const.PORT_TCP_BGPD, |
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| 277 | "OSPF6D" : const.PORT_TCP_OSPF6D, |
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| 278 | "OSPFAPI" : const.PORT_TCP_OSPFAPI, |
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| 279 | "ISISD" : const.PORT_TCP_ISISD, |
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| 280 | "AFBACKUP" : const.PORT_TCP_AFBACKUP, |
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| 281 | "AFMBACKUP" : const.PORT_TCP_AFMBACKUP, |
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| 282 | "XTELL" : const.PORT_TCP_XTELL, |
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| 283 | "FAX" : const.PORT_TCP_FAX, |
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| 284 | "HYLAFAX" : const.PORT_TCP_HYLAFAX, |
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| 285 | "DISTMP3" : const.PORT_TCP_DISTMP3, |
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| 286 | "MUNIN" : const.PORT_TCP_MUNIN, |
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| 287 | "CSTATD" : const.PORT_TCP_CSTATD, |
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| 288 | "SSTATD" : const.PORT_TCP_SSTATD, |
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| 289 | "PCRD" : const.PORT_TCP_PCRD, |
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| 290 | "NOCLOG" : const.PORT_TCP_NOCLOG, |
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| 291 | "HOSTMON" : const.PORT_TCP_HOSTMON, |
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| 292 | "RPLAY" : const.PORT_TCP_RPLAY, |
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| 293 | "RPTP" : const.PORT_TCP_RPTP, |
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| 294 | "NSCA" : const.PORT_TCP_NSCA, |
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| 295 | "MRTD" : const.PORT_TCP_MRTD, |
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| 296 | "BGPSIM" : const.PORT_TCP_BGPSIM, |
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| 297 | "CANNA" : const.PORT_TCP_CANNA, |
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| 298 | "PORT" : const.PORT_TCP_PORT, |
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| 299 | "IRCD" : const.PORT_TCP_IRCD, |
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| 300 | "FTP" : const.PORT_TCP_FTP, |
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| 301 | "WEBCACHE" : const.PORT_TCP_WEBCACHE, |
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| 302 | "TPROXY" : const.PORT_TCP_TPROXY, |
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| 303 | "OMNIORB" : const.PORT_TCP_OMNIORB, |
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| 304 | "DAEMON" : const.PORT_TCP_DAEMON, |
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| 305 | "XINETD" : const.PORT_TCP_XINETD, |
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| 306 | "GIT" : const.PORT_TCP_GIT, |
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| 307 | "ZOPE" : const.PORT_TCP_ZOPE, |
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| 308 | "WEBMIN" : const.PORT_TCP_WEBMIN, |
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| 309 | "KAMANDA" : const.PORT_TCP_KAMANDA, |
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| 310 | "AMANDAIDX" : const.PORT_TCP_AMANDAIDX, |
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| 311 | "AMIDXTAPE" : const.PORT_TCP_AMIDXTAPE, |
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| 312 | "SMSQP" : const.PORT_TCP_SMSQP, |
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| 313 | "XPILOT" : const.PORT_TCP_XPILOT, |
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| 314 | "CAD" : const.PORT_TCP_CAD, |
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| 315 | "ISDNLOG" : const.PORT_TCP_ISDNLOG, |
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| 316 | "VBOXD" : const.PORT_TCP_VBOXD, |
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| 317 | "BINKP" : const.PORT_TCP_BINKP, |
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| 318 | "ASP" : const.PORT_TCP_ASP, |
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| 319 | "CSYNC2" : const.PORT_TCP_CSYNC2, |
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| 320 | "DIRCPROXY" : const.PORT_TCP_DIRCPROXY, |
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| 321 | "TFIDO" : const.PORT_TCP_TFIDO, |
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| 322 | "FIDO" : const.PORT_TCP_FIDO, |
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| 323 | } |
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| 324 | |
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| 325 | class HSequenceNumber(IntField): |
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| 326 | """The sequence number of the first data octet in this segment (except |
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| 327 | when SYN is present). |
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| 328 | |
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| 329 | See RFC 793 for more. |
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| 330 | """ |
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| 331 | bits = 32 |
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| 332 | auto = True |
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| 333 | def _generate_value(self): |
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| 334 | # TODO: implemention real auto-filling here ;) |
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| 335 | # otherwise we can simple return 0 |
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| 336 | return 0 |
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| 337 | |
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| 338 | class HAcknowledgmentNumber(IntField): |
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| 339 | """If the ACK control bit is set this field contains the value of the |
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| 340 | next sequence number the sender of the segment is expecting to receive. |
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| 341 | |
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| 342 | See RFC 793 for more. |
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| 343 | """ |
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| 344 | bits = 32 |
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| 345 | auto = True |
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| 346 | def _generate_value(self): |
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| 347 | # TODO: implemention real auto-filling here ;) |
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| 348 | # otherwise we can simple return 0 |
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| 349 | return 1 |
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| 350 | |
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| 351 | class HDataOffset(SpecialIntField): |
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| 352 | """The number of 32 bit words in the TCP Header. This indicates where |
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| 353 | the data begins. |
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| 354 | |
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| 355 | See RFC 793 for more. |
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| 356 | """ |
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| 357 | bits = 4 |
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| 358 | auto = True |
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| 359 | def _generate_value(self): |
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| 360 | # returns in 32-bits units |
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| 361 | return 5 + self._tmp_value / 32 # 5 is a minimum value |
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| 362 | |
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| 363 | class HReserved(IntField): |
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| 364 | """Reserved for future use. |
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| 365 | |
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| 366 | See RFC 793 for more. |
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| 367 | """ |
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| 368 | bits = 6 |
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| 369 | auto = True |
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| 370 | def _generate_value(self): |
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| 371 | return 0 |
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| 372 | |
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| 373 | class HWindow(IntField): |
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| 374 | """The number of data octets beginning with the one indicated in the |
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| 375 | acknowledgment field which the sender of this segment is willing to accept. |
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| 376 | |
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| 377 | See RFC 793 for more. |
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| 378 | """ |
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| 379 | bits = 16 |
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| 380 | auto = True |
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| 381 | def _generate_value(self): |
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| 382 | # TODO: implemention real auto-filling here ;) |
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| 383 | # otherwise we can simple return 0 |
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| 384 | return 512 |
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| 385 | |
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| 386 | class HUrgentPointer(IntField): |
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| 387 | """This field communicates the current value of the urgent pointer as a |
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| 388 | positive offset from the sequence number in this segment. |
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| 389 | |
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| 390 | See RFC 793 for more. |
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| 391 | """ |
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| 392 | bits = 16 |
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| 393 | auto = True |
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| 394 | def _generate_value(self): |
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| 395 | # TODO: implemention real auto-filling here ;) |
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| 396 | # otherwise we can simple return 0 |
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| 397 | return 0 |
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| 398 | |
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| 399 | class TCP(Protocol): |
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| 400 | """This is Transmission Control Protocol. |
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| 401 | It the most common protocol in the Internet on fourth layer |
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| 402 | of the OSI model. |
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| 403 | """ |
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| 404 | layer = 4 # layer of the OSI |
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| 405 | protocol_id = const.PROTOCOL_TCP |
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| 406 | name = "TCP" |
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| 407 | |
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| 408 | _ordered_fields = ('source_port', 'destination_port', '_sequence_number', |
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| 409 | '_acknowledgment_number', '_data_offset', '_reserved', |
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| 410 | 'control_bits', '_window', '_checksum', '_urgent_pointer', |
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| 411 | 'options', '_padding',) |
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| 412 | |
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| 413 | def __init__(self, **kw): |
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| 414 | control_bits = ('urg', 'ack', 'psh', 'rst', 'syn', 'fin') |
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| 415 | control_bits_predefined = dict.fromkeys(control_bits, 0) |
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| 416 | |
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| 417 | fields_list = [ HPort("Source Port", 0), |
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| 418 | HPort("Destination Port", 0), |
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| 419 | HSequenceNumber("Sequence Number"), |
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| 420 | HAcknowledgmentNumber("Acknowledgment Number"), |
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| 421 | HDataOffset("DataOffset"), HReserved("Reserved", 0), |
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| 422 | Flags("Control Bits", control_bits, |
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| 423 | **control_bits_predefined), |
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| 424 | HWindow("Window"), Layer4ChecksumField("Checksum"), |
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| 425 | HUrgentPointer("Urgent Pointer"), Flags("Options", ()), |
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| 426 | PaddingField("Padding") ] |
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| 427 | |
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| 428 | # we call super.__init__ after prepared necessary data |
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| 429 | super(TCP, self).__init__(fields_list, **kw) |
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| 430 | |
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| 431 | # set __doc__ for fields - it's important if you want to get hints |
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| 432 | # in some frontends. E.g. Umit Project provides one... |
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| 433 | self._get_field('source_port').set_doc("The source port number. \ |
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| 434 | See RFC 793 for more.") |
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| 435 | self._get_field('destination_port').set_doc("The destination port \ |
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| 436 | number. See RFC 793 for more.") |
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| 437 | self._get_field('control_bits').set_doc("URG, ACK, PSH, RST, SYN, FIN \ |
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| 438 | flags. See RFC 793 for more.") |
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| 439 | self._get_field('_checksum').set_doc("Checksum of Pseudo Header, TCP \ |
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| 440 | header and data. See RFC 793 for more.") |
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| 441 | self._get_field('options').set_doc("Options may occupy space at the \ |
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| 442 | end of the TCP header and are a multiple of 8 bits in length. See RFC 793 \ |
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| 443 | for more.") |
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| 444 | self._get_field('_padding').set_doc("The TCP header padding is used \ |
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| 445 | to ensure that the TCP header ends and data begins on a 32 bit boundary. \ |
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| 446 | See RFC 793 for more.") |
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| 447 | |
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| 448 | def _pre_raw(self, raw_value, bit, protocol_container, protocol_bits): |
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| 449 | # Padding |
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| 450 | self._get_field('_padding')._tmp_value = \ |
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| 451 | self._get_field('options').bits |
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| 452 | |
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| 453 | # Data Offset |
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| 454 | self._get_field('_data_offset')._tmp_value = \ |
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| 455 | self._get_field('options').bits + self._get_field('_padding').bits |
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| 456 | |
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| 457 | return raw_value, bit |
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| 458 | |
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| 459 | def _post_raw(self, raw_value, bit, protocol_container, protocol_bits): |
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| 460 | # rev_offset it the offset from the right side |
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| 461 | cksum_rev_offset = bit - self.get_offset('_checksum') - \ |
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| 462 | self._get_field('_checksum').bits |
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| 463 | # checking if user not defined his own value of checksum |
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| 464 | if bits.get_bits(raw_value, self._get_field('_checksum').bits, |
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| 465 | cksum_rev_offset, rev_offset=True) == 0: |
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| 466 | # Payload |
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| 467 | if self.payload: |
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| 468 | cksum = self.payload.__dict__['__raw_value'] |
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| 469 | else: |
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| 470 | cksum = 0 |
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| 471 | offset = protocol_bits |
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| 472 | |
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| 473 | # TCP Header |
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| 474 | cksum |= raw_value << offset |
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| 475 | offset += bit |
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| 476 | |
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| 477 | # Pseudo Header |
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| 478 | # |
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| 479 | # TCP header length...converted to bits unit |
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| 480 | total_length = self._get_field('_data_offset').fillout()*32 |
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| 481 | # add payload |
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| 482 | total_length += protocol_bits |
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| 483 | # conversion to bytes unit |
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| 484 | total_length /= 8 |
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| 485 | |
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| 486 | # create pseudo header object |
|---|
| 487 | pheader = PseudoHeader(self.protocol_id, total_length) |
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| 488 | # generate raw value of it |
|---|
| 489 | pheader_raw = pheader._get_raw(protocol_container, |
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| 490 | protocol_bits)[0] |
|---|
| 491 | # added pseudo header bits to cksum value |
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| 492 | cksum |= pheader_raw << offset |
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| 493 | |
|---|
| 494 | # finally, calcute and apply checksum |
|---|
| 495 | raw_cksum = net.in_cksum(cksum) |
|---|
| 496 | raw_value |= raw_cksum << cksum_rev_offset |
|---|
| 497 | |
|---|
| 498 | return raw_value, bit |
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| 499 | |
|---|
| 500 | protocols = [ TCP, ] |
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