1 | #! /usr/bin/env python |
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2 | # -*- coding: ISO-8859-15 -*- |
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3 | # |
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4 | # PyKota - Print Quotas for CUPS and LPRng |
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5 | # |
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6 | # (c) 2003-2004 Jerome Alet <alet@librelogiciel.com> |
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7 | # This program is free software; you can redistribute it and/or modify |
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8 | # it under the terms of the GNU General Public License as published by |
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9 | # the Free Software Foundation; either version 2 of the License, or |
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10 | # (at your option) any later version. |
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11 | # |
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12 | # This program is distributed in the hope that it will be useful, |
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13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | # GNU General Public License for more details. |
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16 | # |
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17 | # You should have received a copy of the GNU General Public License |
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18 | # along with this program; if not, write to the Free Software |
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19 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
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20 | # |
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21 | # $Id$ |
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22 | # |
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23 | # |
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24 | |
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25 | import sys |
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26 | from struct import unpack |
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27 | |
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28 | OPERATION_ATTRIBUTES_TAG = 0x01 |
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29 | JOB_ATTRIBUTES_TAG = 0x02 |
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30 | END_OF_ATTRIBUTES_TAG = 0x03 |
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31 | PRINTER_ATTRIBUTES_TAG = 0x04 |
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32 | UNSUPPORTED_ATTRIBUTES_TAG = 0x05 |
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33 | |
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34 | class PyKotaIPPError(Exception): |
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35 | """An exception for PyKota IPP related stuff.""" |
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36 | def __init__(self, message = ""): |
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37 | self.message = message |
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38 | Exception.__init__(self, message) |
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39 | def __repr__(self): |
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40 | return self.message |
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41 | __str__ = __repr__ |
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42 | |
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43 | class IPPMessage : |
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44 | """A class for IPP message files.""" |
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45 | def __init__(self, data) : |
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46 | """Initializes an IPP Message object.""" |
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47 | self.data = data |
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48 | self._attributes = {} |
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49 | self.curname = None |
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50 | self.tags = [ None ] * 256 # by default all tags reserved |
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51 | |
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52 | # Delimiter tags |
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53 | self.tags[0x01] = "operation-attributes-tag" |
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54 | self.tags[0x02] = "job-attributes-tag" |
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55 | self.tags[0x03] = "end-of-attributes-tag" |
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56 | self.tags[0x04] = "printer-attributes-tag" |
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57 | self.tags[0x05] = "unsupported-attributes-tag" |
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58 | |
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59 | # out of band values |
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60 | self.tags[0x10] = "unsupported" |
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61 | self.tags[0x11] = "reserved-for-future-default" |
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62 | self.tags[0x12] = "unknown" |
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63 | self.tags[0x13] = "no-value" |
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64 | |
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65 | # integer values |
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66 | self.tags[0x20] = "generic-integer" |
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67 | self.tags[0x21] = "integer" |
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68 | self.tags[0x22] = "boolean" |
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69 | self.tags[0x23] = "enum" |
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70 | |
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71 | # octetString |
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72 | self.tags[0x30] = "octetString-with-an-unspecified-format" |
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73 | self.tags[0x31] = "dateTime" |
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74 | self.tags[0x32] = "resolution" |
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75 | self.tags[0x33] = "rangeOfInteger" |
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76 | self.tags[0x34] = "reserved-for-collection" |
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77 | self.tags[0x35] = "textWithLanguage" |
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78 | self.tags[0x36] = "nameWithLanguage" |
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79 | |
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80 | # character strings |
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81 | self.tags[0x20] = "generic-character-string" |
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82 | self.tags[0x41] = "textWithoutLanguage" |
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83 | self.tags[0x42] = "nameWithoutLanguage" |
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84 | # self.tags[0x43] = "reserved" |
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85 | self.tags[0x44] = "keyword" |
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86 | self.tags[0x45] = "uri" |
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87 | self.tags[0x46] = "uriScheme" |
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88 | self.tags[0x47] = "charset" |
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89 | self.tags[0x48] = "naturalLanguage" |
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90 | self.tags[0x49] = "mimeMediaType" |
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91 | |
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92 | # now parses the IPP message |
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93 | self.parse() |
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94 | |
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95 | def __getattr__(self, attrname) : |
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96 | """Allows self.attributes to return the attributes names.""" |
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97 | if attrname == "attributes" : |
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98 | keys = self._attributes.keys() |
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99 | keys.sort() |
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100 | return keys |
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101 | raise AttributeError, attrname |
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102 | |
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103 | def __getitem__(self, ippattrname) : |
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104 | """Fakes a dictionnary d['key'] notation.""" |
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105 | value = self._attributes.get(ippattrname) |
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106 | if value is not None : |
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107 | if len(value) == 1 : |
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108 | value = value[0] |
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109 | return value |
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110 | get = __getitem__ |
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111 | |
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112 | def parseTag(self) : |
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113 | """Extracts information from an IPP tag.""" |
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114 | pos = self.position |
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115 | valuetag = self.tags[ord(self.data[pos])] |
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116 | # print valuetag.get("name") |
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117 | pos += 1 |
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118 | posend = pos2 = pos + 2 |
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119 | namelength = unpack(">H", self.data[pos:pos2])[0] |
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120 | if not namelength : |
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121 | name = self.curname |
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122 | else : |
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123 | posend += namelength |
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124 | self.curname = name = self.data[pos2:posend] |
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125 | pos2 = posend + 2 |
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126 | valuelength = unpack(">H", self.data[posend:pos2])[0] |
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127 | posend = pos2 + valuelength |
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128 | value = self.data[pos2:posend] |
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129 | oldval = self._attributes.setdefault(name, []) |
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130 | oldval.append(value) |
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131 | return posend - self.position |
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132 | |
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133 | def operation_attributes_tag(self) : |
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134 | """Indicates that the parser enters into an operation-attributes-tag group.""" |
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135 | return self.parseTag() |
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136 | |
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137 | def job_attributes_tag(self) : |
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138 | """Indicates that the parser enters into an operation-attributes-tag group.""" |
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139 | return self.parseTag() |
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140 | |
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141 | def printer_attributes_tag(self) : |
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142 | """Indicates that the parser enters into an operation-attributes-tag group.""" |
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143 | return self.parseTag() |
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144 | |
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145 | def parse(self) : |
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146 | """Parses an IPP Message. |
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147 | |
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148 | NB : Only a subset of RFC2910 is implemented. |
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149 | We are only interested in textual informations for now anyway. |
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150 | """ |
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151 | self.version = "%s.%s" % (ord(self.data[0]), ord(self.data[1])) |
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152 | self.operation_id = "0x%04x" % unpack(">H", self.data[2:4])[0] |
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153 | self.request_id = "0x%08x" % unpack(">I", self.data[4:8])[0] |
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154 | self.position = 8 |
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155 | try : |
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156 | tag = ord(self.data[self.position]) |
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157 | while tag != END_OF_ATTRIBUTES_TAG : |
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158 | self.position += 1 |
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159 | name = self.tags[tag] |
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160 | if name is not None : |
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161 | func = getattr(self, name.replace("-", "_"), None) |
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162 | if func is not None : |
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163 | self.position += func() |
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164 | if ord(self.data[self.position]) > UNSUPPORTED_ATTRIBUTES_TAG : |
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165 | self.position -= 1 |
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166 | continue |
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167 | tag = ord(self.data[self.position]) |
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168 | except IndexError : |
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169 | raise PyKotaIPPError, "Unexpected end of IPP message." |
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170 | |
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171 | if __name__ == "__main__" : |
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172 | if len(sys.argv) < 2 : |
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173 | print "usage : python ipp.py /var/spool/cups/c00005 (for example)\n" |
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174 | else : |
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175 | infile = open(sys.argv[1]) |
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176 | message = IPPMessage(infile.read()) |
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177 | infile.close() |
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178 | print "Client hostname : %s" % message["job-originating-host-name"] |
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