1 | # PyKota |
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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, 2005, 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 | ITERATIONDELAY = 1.5 # 1.5 Second |
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26 | STABILIZATIONDELAY = 3 # We must read three times the same value to consider it to be stable |
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27 | NOPRINTINGMAXDELAY = 60 # The printer must begin to print within 60 seconds. |
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28 | |
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29 | import sys |
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30 | import os |
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31 | import time |
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32 | import select |
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33 | |
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34 | try : |
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35 | from pysnmp.entity.rfc3413.oneliner import cmdgen |
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36 | except ImportError : |
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37 | hasV4 = False |
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38 | try : |
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39 | from pysnmp.asn1.encoding.ber.error import TypeMismatchError |
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40 | from pysnmp.mapping.udp.error import SnmpOverUdpError |
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41 | from pysnmp.mapping.udp.role import Manager |
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42 | from pysnmp.proto.api import alpha |
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43 | except ImportError : |
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44 | raise RuntimeError, "The pysnmp module is not available. Download it from http://pysnmp.sf.net/" |
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45 | else : |
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46 | hasV4 = True |
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47 | |
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48 | # |
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49 | # Documentation taken from RFC 3805 (Printer MIB v2) and RFC 2790 (Host Resource MIB) |
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50 | # |
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51 | pageCounterOID = "1.3.6.1.2.1.43.10.2.1.4.1.1" # SNMPv2-SMI::mib-2.43.10.2.1.4.1.1 |
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52 | hrPrinterStatusOID = "1.3.6.1.2.1.25.3.5.1.1.1" # SNMPv2-SMI::mib-2.25.3.5.1.1.1 |
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53 | printerStatusValues = { 1 : 'other', |
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54 | 2 : 'unknown', |
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55 | 3 : 'idle', |
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56 | 4 : 'printing', |
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57 | 5 : 'warmup', |
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58 | } |
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59 | hrDeviceStatusOID = "1.3.6.1.2.1.25.3.2.1.5.1" # SNMPv2-SMI::mib-2.25.3.2.1.5.1 |
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60 | deviceStatusValues = { 1 : 'unknown', |
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61 | 2 : 'running', |
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62 | 3 : 'warning', |
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63 | 4 : 'testing', |
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64 | 5 : 'down', |
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65 | } |
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66 | hrPrinterDetectedErrorStateOID = "1.3.6.1.2.1.25.3.5.1.2.1" # SNMPv2-SMI::mib-2.25.3.5.1.2.1 |
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67 | prtConsoleDisplayBufferTextOID = "1.3.6.1.2.1.43.16.5.1.2.1.1" # SNMPv2-SMI::mib-2.43.16.5.1.2.1.1 |
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68 | class BaseHandler : |
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69 | """A class for SNMP print accounting.""" |
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70 | def __init__(self, parent, printerhostname) : |
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71 | self.parent = parent |
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72 | self.printerHostname = printerhostname |
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73 | try : |
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74 | self.community = self.parent.arguments.split(":")[1].strip() |
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75 | except IndexError : |
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76 | self.community = "public" |
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77 | self.port = 161 |
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78 | self.printerInternalPageCounter = None |
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79 | self.printerStatus = None |
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80 | self.deviceStatus = None |
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81 | |
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82 | def retrieveSNMPValues(self) : |
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83 | """Retrieves a printer's internal page counter and status via SNMP.""" |
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84 | raise RuntimeError, "You have to overload this method." |
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85 | |
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86 | def waitPrinting(self) : |
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87 | """Waits for printer status being 'printing'.""" |
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88 | previousValue = self.parent.getLastPageCounter() |
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89 | timebefore = time.time() |
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90 | firstvalue = None |
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91 | while 1: |
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92 | self.retrieveSNMPValues() |
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93 | statusAsString = printerStatusValues.get(self.printerStatus) |
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94 | if statusAsString in ('printing', 'warmup') : |
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95 | break |
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96 | if self.printerInternalPageCounter is not None : |
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97 | if firstvalue is None : |
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98 | # first time we retrieved a page counter, save it |
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99 | firstvalue = self.printerInternalPageCounter |
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100 | else : |
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101 | # second time (or later) |
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102 | if firstvalue < self.printerInternalPageCounter : |
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103 | # Here we have a printer which lies : |
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104 | # it says it is not printing or warming up |
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105 | # BUT the page counter increases !!! |
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106 | # So we can probably quit being sure it is printing. |
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107 | self.parent.filter.printInfo("Printer %s is lying to us !!!" % self.parent.filter.PrinterName, "warn") |
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108 | break |
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109 | elif (time.time() - timebefore) > NOPRINTINGMAXDELAY : |
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110 | # More than X seconds without the printer being in 'printing' mode |
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111 | # We can safely assume this won't change if printer is now 'idle' |
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112 | pstatusAsString = printerStatusValues.get(self.printerStatus) |
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113 | dstatusAsString = deviceStatusValues.get(self.deviceStatus) |
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114 | if (pstatusAsString == 'idle') or \ |
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115 | ((pstatusAsString == 'other') and \ |
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116 | (dstatusAsString == 'running')) : |
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117 | if self.printerInternalPageCounter == previousValue : |
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118 | # Here the job won't be printed, because probably |
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119 | # the printer rejected it for some reason. |
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120 | self.parent.filter.printInfo("Printer %s probably won't print this job !!!" % self.parent.filter.PrinterName, "warn") |
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121 | else : |
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122 | # Here the job has already been entirely printed, and |
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123 | # the printer has already passed from 'idle' to 'printing' to 'idle' again. |
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124 | self.parent.filter.printInfo("Printer %s has probably already printed this job !!!" % self.parent.filter.PrinterName, "warn") |
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125 | break |
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126 | self.parent.filter.logdebug(_("Waiting for printer %s to be printing...") % self.parent.filter.PrinterName) |
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127 | time.sleep(ITERATIONDELAY) |
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128 | |
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129 | def waitIdle(self) : |
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130 | """Waits for printer status being 'idle'.""" |
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131 | idle_num = idle_flag = 0 |
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132 | while 1 : |
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133 | self.retrieveSNMPValues() |
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134 | pstatusAsString = printerStatusValues.get(self.printerStatus) |
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135 | dstatusAsString = deviceStatusValues.get(self.deviceStatus) |
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136 | idle_flag = 0 |
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137 | if (pstatusAsString == 'idle') or \ |
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138 | ((pstatusAsString == 'other') and \ |
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139 | (dstatusAsString == 'running')) : |
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140 | idle_flag = 1 # Standby / Powersave is considered idle |
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141 | if idle_flag : |
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142 | idle_num += 1 |
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143 | if idle_num >= STABILIZATIONDELAY : |
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144 | # printer status is stable, we can exit |
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145 | break |
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146 | else : |
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147 | idle_num = 0 |
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148 | self.parent.filter.logdebug(_("Waiting for printer %s's idle status to stabilize...") % self.parent.filter.PrinterName) |
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149 | time.sleep(ITERATIONDELAY) |
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150 | |
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151 | def retrieveInternalPageCounter(self) : |
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152 | """Returns the page counter from the printer via internal SNMP handling.""" |
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153 | try : |
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154 | if (os.environ.get("PYKOTASTATUS") != "CANCELLED") and \ |
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155 | (os.environ.get("PYKOTAACTION") == "ALLOW") and \ |
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156 | (os.environ.get("PYKOTAPHASE") == "AFTER") and \ |
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157 | self.parent.filter.JobSizeBytes : |
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158 | self.waitPrinting() |
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159 | self.waitIdle() |
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160 | except : |
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161 | self.parent.filter.printInfo(_("SNMP querying stage interrupted. Using latest value seen for internal page counter (%s) on printer %s.") % (self.printerInternalPageCounter, self.parent.filter.PrinterName), "warn") |
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162 | raise |
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163 | return self.printerInternalPageCounter |
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164 | |
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165 | if hasV4 : |
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166 | class Handler(BaseHandler) : |
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167 | """A class for pysnmp v4.x""" |
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168 | def retrieveSNMPValues(self) : |
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169 | """Retrieves a printer's internal page counter and status via SNMP.""" |
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170 | errorIndication, errorStatus, errorIndex, varBinds = \ |
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171 | cmdgen.CommandGenerator().getCmd(cmdgen.CommunityData("pykota", self.community, 0), \ |
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172 | cmdgen.UdpTransportTarget((self.printerHostname, self.port)), \ |
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173 | tuple([int(i) for i in pageCounterOID.split('.')]), \ |
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174 | tuple([int(i) for i in hrPrinterStatusOID.split('.')]), \ |
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175 | tuple([int(i) for i in hrDeviceStatusOID.split('.')])) |
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176 | if errorIndication : |
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177 | self.parent.filter.printInfo("SNMP Error : %s" % errorIndication, "error") |
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178 | elif errorStatus : |
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179 | self.parent.filter.printInfo("SNMP Error : %s at %s" % (errorStatus.prettyPrint(), \ |
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180 | varBinds[int(errorIndex)-1]), \ |
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181 | "error") |
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182 | else : |
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183 | self.printerInternalPageCounter = max(self.printerInternalPageCounter, int(varBinds[0][1].prettyPrint())) |
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184 | self.printerStatus = int(varBinds[1][1].prettyPrint()) |
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185 | self.deviceStatus = int(varBinds[2][1].prettyPrint()) |
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186 | self.parent.filter.logdebug("SNMP answer decoded : PageCounter : %s PrinterStatus : '%s' DeviceStatus : '%s'" \ |
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187 | % (self.printerInternalPageCounter, \ |
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188 | printerStatusValues.get(self.printerStatus), \ |
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189 | deviceStatusValues.get(self.deviceStatus))) |
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190 | else : |
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191 | class Handler(BaseHandler) : |
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192 | """A class for pysnmp v3.4.x""" |
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193 | def retrieveSNMPValues(self) : |
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194 | """Retrieves a printer's internal page counter and status via SNMP.""" |
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195 | ver = alpha.protoVersions[alpha.protoVersionId1] |
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196 | req = ver.Message() |
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197 | req.apiAlphaSetCommunity(self.community) |
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198 | req.apiAlphaSetPdu(ver.GetRequestPdu()) |
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199 | req.apiAlphaGetPdu().apiAlphaSetVarBindList((pageCounterOID, ver.Null()), \ |
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200 | (hrPrinterStatusOID, ver.Null()), \ |
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201 | (hrDeviceStatusOID, ver.Null())) |
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202 | tsp = Manager() |
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203 | try : |
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204 | tsp.sendAndReceive(req.berEncode(), \ |
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205 | (self.printerHostname, self.port), \ |
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206 | (self.handleAnswer, req)) |
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207 | except (SnmpOverUdpError, select.error), msg : |
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208 | self.parent.filter.printInfo(_("Network error while doing SNMP queries on printer %s : %s") % (self.printerHostname, msg), "warn") |
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209 | tsp.close() |
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210 | |
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211 | def handleAnswer(self, wholeMsg, notusedhere, req): |
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212 | """Decodes and handles the SNMP answer.""" |
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213 | self.parent.filter.logdebug("SNMP answer : '%s'" % repr(wholeMsg)) |
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214 | ver = alpha.protoVersions[alpha.protoVersionId1] |
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215 | rsp = ver.Message() |
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216 | try : |
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217 | rsp.berDecode(wholeMsg) |
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218 | except TypeMismatchError, msg : |
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219 | self.parent.filter.printInfo(_("SNMP message decoding error for printer %s : %s") % (self.printerHostname, msg), "warn") |
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220 | else : |
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221 | if req.apiAlphaMatch(rsp): |
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222 | errorStatus = rsp.apiAlphaGetPdu().apiAlphaGetErrorStatus() |
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223 | if errorStatus: |
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224 | self.parent.filter.printInfo(_("Problem encountered while doing SNMP queries on printer %s : %s") % (self.printerHostname, errorStatus), "warn") |
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225 | else: |
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226 | self.values = [] |
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227 | for varBind in rsp.apiAlphaGetPdu().apiAlphaGetVarBindList(): |
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228 | self.values.append(varBind.apiAlphaGetOidVal()[1].rawAsn1Value) |
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229 | try : |
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230 | # keep maximum value seen for printer's internal page counter |
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231 | self.printerInternalPageCounter = max(self.printerInternalPageCounter, self.values[0]) |
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232 | self.printerStatus = self.values[1] |
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233 | self.deviceStatus = self.values[2] |
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234 | self.parent.filter.logdebug("SNMP answer decoded : PageCounter : %s PrinterStatus : '%s' DeviceStatus : '%s'" \ |
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235 | % (self.printerInternalPageCounter, \ |
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236 | printerStatusValues.get(self.printerStatus), \ |
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237 | deviceStatusValues.get(self.deviceStatus))) |
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238 | except IndexError : |
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239 | self.parent.filter.logdebug("SNMP answer is incomplete : %s" % str(self.values)) |
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240 | pass |
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241 | else : |
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242 | return 1 |
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243 | |
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244 | def main(hostname) : |
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245 | """Tries SNMP accounting for a printer host.""" |
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246 | class fakeFilter : |
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247 | """Fakes a filter for testing purposes.""" |
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248 | def __init__(self) : |
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249 | """Initializes the fake filter.""" |
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250 | self.PrinterName = "FakePrintQueue" |
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251 | self.JobSizeBytes = 1 |
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252 | |
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253 | def printInfo(self, msg, level="info") : |
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254 | """Prints informational message.""" |
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255 | sys.stderr.write("%s : %s\n" % (level.upper(), msg)) |
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256 | sys.stderr.flush() |
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257 | |
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258 | def logdebug(self, msg) : |
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259 | """Prints debug message.""" |
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260 | self.printInfo(msg, "debug") |
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261 | |
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262 | class fakeAccounter : |
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263 | """Fakes an accounter for testing purposes.""" |
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264 | def __init__(self) : |
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265 | """Initializes fake accounter.""" |
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266 | self.arguments = "snmp:public" |
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267 | self.filter = fakeFilter() |
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268 | self.protocolHandler = Handler(self, hostname) |
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269 | |
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270 | def getLastPageCounter(self) : |
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271 | """Fakes the return of a page counter.""" |
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272 | return 0 |
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273 | |
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274 | acc = fakeAccounter() |
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275 | return acc.protocolHandler.retrieveInternalPageCounter() |
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276 | |
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277 | if __name__ == "__main__" : |
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278 | if len(sys.argv) != 2 : |
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279 | sys.stderr.write("Usage : python %s printer_ip_address\n" % sys.argv[0]) |
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280 | else : |
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281 | def _(msg) : |
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282 | return msg |
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283 | |
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284 | pagecounter = main(sys.argv[1]) |
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285 | print "Internal page counter's value is : %s" % pagecounter |
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