| 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 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 os |
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| 26 | import socket |
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| 27 | import time |
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| 28 | import signal |
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| 29 | import popen2 |
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| 30 | |
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| 31 | from pykota.accounter import AccounterBase, PyKotaAccounterError |
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| 32 | |
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| 33 | ITERATIONDELAY = 1.0 # 1 Second |
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| 34 | STABILIZATIONDELAY = 3 # We must read three times the same value to consider it to be stable |
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| 35 | |
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| 36 | try : |
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| 37 | from pysnmp.asn1.encoding.ber.error import TypeMismatchError |
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| 38 | from pysnmp.mapping.udp.error import SnmpOverUdpError |
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| 39 | from pysnmp.mapping.udp.role import Manager |
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| 40 | from pysnmp.proto.api import alpha |
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| 41 | except ImportError : |
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| 42 | hasSNMP = 0 |
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| 43 | else : |
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| 44 | hasSNMP = 1 |
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| 45 | 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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| 46 | 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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| 47 | printerStatusValues = { 1 : 'other', |
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| 48 | 2 : 'unknown', |
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| 49 | 3 : 'idle', |
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| 50 | 4 : 'printing', |
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| 51 | 5 : 'warmup', |
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| 52 | } |
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| 53 | 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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| 54 | deviceStatusValues = { 1 : 'unknown', |
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| 55 | 2 : 'running', |
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| 56 | 3 : 'warning', |
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| 57 | 4 : 'testing', |
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| 58 | 5 : 'down', |
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| 59 | } |
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| 60 | 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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| 61 | 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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| 62 | |
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| 63 | # |
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| 64 | # Documentation taken from RFC 3805 (Printer MIB v2) and RFC 2790 (Host Resource MIB) |
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| 65 | # |
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| 66 | # TODO : if hrDeviceStatus==2 and hrPrinterStatus==1 then it's powersave mode. |
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| 67 | # |
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| 68 | class SNMPAccounter : |
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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 | self.printerInternalPageCounter = self.printerStatus = None |
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| 74 | |
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| 75 | def retrieveSNMPValues(self) : |
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| 76 | """Retrieves a printer's internal page counter and status via SNMP.""" |
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| 77 | ver = alpha.protoVersions[alpha.protoVersionId1] |
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| 78 | req = ver.Message() |
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| 79 | req.apiAlphaSetCommunity('public') |
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| 80 | req.apiAlphaSetPdu(ver.GetRequestPdu()) |
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| 81 | req.apiAlphaGetPdu().apiAlphaSetVarBindList((pageCounterOID, ver.Null()), \ |
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| 82 | (hrPrinterStatusOID, ver.Null())) |
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| 83 | tsp = Manager() |
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| 84 | try : |
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| 85 | tsp.sendAndReceive(req.berEncode(), (self.printerHostname, 161), (self.handleAnswer, req)) |
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| 86 | except SnmpOverUdpError, msg : |
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| 87 | self.parent.filter.printInfo(_("Network error while doing SNMP queries on printer %s : %s") % (self.printerHostname, msg), "warn") |
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| 88 | tsp.close() |
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| 89 | |
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| 90 | def handleAnswer(self, wholeMsg, notusedhere, req): |
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| 91 | """Decodes and handles the SNMP answer.""" |
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| 92 | self.parent.filter.logdebug("SNMP message : '%s'" % repr(wholeMsg)) |
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| 93 | ver = alpha.protoVersions[alpha.protoVersionId1] |
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| 94 | rsp = ver.Message() |
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| 95 | try : |
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| 96 | rsp.berDecode(wholeMsg) |
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| 97 | except TypeMismatchError, msg : |
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| 98 | self.parent.filter.printInfo(_("SNMP message decoding error for printer %s : %s") % (self.printerHostname, msg), "warn") |
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| 99 | else : |
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| 100 | if req.apiAlphaMatch(rsp): |
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| 101 | errorStatus = rsp.apiAlphaGetPdu().apiAlphaGetErrorStatus() |
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| 102 | if errorStatus: |
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| 103 | self.parent.filter.printInfo(_("Problem encountered while doing SNMP queries on printer %s : %s") % (self.printerHostname, errorStatus), "warn") |
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| 104 | else: |
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| 105 | self.values = [] |
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| 106 | for varBind in rsp.apiAlphaGetPdu().apiAlphaGetVarBindList(): |
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| 107 | self.values.append(varBind.apiAlphaGetOidVal()[1].rawAsn1Value) |
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| 108 | try : |
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| 109 | # keep maximum value seen for printer's internal page counter |
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| 110 | self.printerInternalPageCounter = max(self.printerInternalPageCounter, self.values[0]) |
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| 111 | self.printerStatus = self.values[1] |
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| 112 | self.parent.filter.logdebug("SNMP answer is decoded : PageCounter : %s Status : %s" % (self.values[0], self.values[1])) |
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| 113 | except IndexError : |
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| 114 | self.parent.filter.logdebug("SNMP answer is incomplete : %s" % str(self.values)) |
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| 115 | pass |
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| 116 | else : |
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| 117 | return 1 |
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| 118 | |
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| 119 | def waitPrinting(self) : |
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| 120 | """Waits for printer status being 'printing'.""" |
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| 121 | firstvalue = None |
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| 122 | while 1: |
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| 123 | self.retrieveSNMPValues() |
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| 124 | statusAsString = printerStatusValues.get(self.printerStatus) |
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| 125 | if statusAsString in ('printing', 'warmup') : |
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| 126 | break |
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| 127 | if self.printerInternalPageCounter is not None : |
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| 128 | if firstvalue is None : |
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| 129 | # first time we retrieved a page counter, save it |
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| 130 | firstvalue = self.printerInternalPageCounter |
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| 131 | else : |
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| 132 | # second time (or later) |
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| 133 | if firstvalue < self.printerInternalPageCounter : |
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| 134 | # Here we have a printer which lies : |
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| 135 | # it says it is not printing or warming up |
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| 136 | # BUT the page counter increases !!! |
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| 137 | # So we can probably quit being sure it is printing. |
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| 138 | self.parent.filter.printInfo("Printer %s is lying to us !!!" % self.parent.filter.printername, "warn") |
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| 139 | break |
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| 140 | self.parent.filter.logdebug(_("Waiting for printer %s to be printing...") % self.parent.filter.printername) |
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| 141 | time.sleep(ITERATIONDELAY) |
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| 142 | |
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| 143 | def waitIdle(self) : |
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| 144 | """Waits for printer status being 'idle'.""" |
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| 145 | idle_num = idle_flag = 0 |
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| 146 | while 1 : |
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| 147 | self.retrieveSNMPValues() |
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| 148 | statusAsString = printerStatusValues.get(self.printerStatus) |
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| 149 | idle_flag = 0 |
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| 150 | if statusAsString in ('idle',) : |
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| 151 | idle_flag = 1 |
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| 152 | if idle_flag : |
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| 153 | idle_num += 1 |
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| 154 | if idle_num > STABILIZATIONDELAY : |
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| 155 | # printer status is stable, we can exit |
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| 156 | break |
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| 157 | else : |
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| 158 | idle_num = 0 |
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| 159 | self.parent.filter.logdebug(_("Waiting for printer %s's idle status to stabilize...") % self.parent.filter.printername) |
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| 160 | time.sleep(ITERATIONDELAY) |
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| 161 | |
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| 162 | pjlMessage = "\033%-12345X@PJL USTATUSOFF\r\n@PJL INFO STATUS\r\n@PJL INFO PAGECOUNT\r\n\033%-12345X" |
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| 163 | pjlStatusValues = { |
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| 164 | "10000" : "Powersave Mode", |
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| 165 | "10001" : "Ready Online", |
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| 166 | "10002" : "Ready Offline", |
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| 167 | "10003" : "Warming Up", |
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| 168 | "10004" : "Self Test", |
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| 169 | "10005" : "Reset", |
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| 170 | "10023" : "Printing", |
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| 171 | "35078" : "Powersave Mode", # 10000 is ALSO powersave !!! |
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| 172 | } |
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| 173 | class PJLAccounter : |
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| 174 | """A class for PJL print accounting.""" |
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| 175 | def __init__(self, parent, printerhostname) : |
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| 176 | self.parent = parent |
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| 177 | self.printerHostname = printerhostname |
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| 178 | self.printerInternalPageCounter = self.printerStatus = None |
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| 179 | self.printerInternalPageCounter = self.printerStatus = None |
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| 180 | self.timedout = 0 |
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| 181 | |
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| 182 | def alarmHandler(self, signum, frame) : |
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| 183 | """Query has timedout, handle this.""" |
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| 184 | self.timedout = 1 |
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| 185 | raise IOError, "Waiting for PJL answer timed out. Please try again later." |
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| 186 | |
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| 187 | def retrievePJLValues(self) : |
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| 188 | """Retrieves a printer's internal page counter and status via PJL.""" |
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| 189 | port = 9100 |
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| 190 | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
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| 191 | try : |
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| 192 | sock.connect((self.printerHostname, port)) |
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| 193 | except socket.error, msg : |
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| 194 | self.parent.filter.printInfo(_("Problem during connection to %s:%s : %s") % (self.printerHostname, port, msg), "warn") |
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| 195 | else : |
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| 196 | try : |
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| 197 | sock.send(pjlMessage) |
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| 198 | except socket.error, msg : |
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| 199 | self.parent.filter.printInfo(_("Problem while sending PJL query to %s:%s : %s") % (self.printerHostname, port, msg), "warn") |
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| 200 | else : |
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| 201 | actualpagecount = self.printerStatus = None |
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| 202 | self.timedout = 0 |
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| 203 | while (self.timedout == 0) or (actualpagecount is None) or (self.printerStatus is None) : |
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| 204 | signal.signal(signal.SIGALRM, self.alarmHandler) |
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| 205 | signal.alarm(3) |
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| 206 | try : |
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| 207 | answer = sock.recv(1024) |
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| 208 | except IOError, msg : |
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| 209 | break # our alarm handler was launched, probably |
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| 210 | else : |
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| 211 | readnext = 0 |
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| 212 | for line in [l.strip() for l in answer.split()] : |
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| 213 | if line.startswith("CODE=") : |
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| 214 | self.printerStatus = line.split("=")[1] |
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| 215 | elif line.startswith("PAGECOUNT") : |
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| 216 | readnext = 1 # page counter is on next line |
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| 217 | elif readnext : |
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| 218 | actualpagecount = int(line.strip()) |
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| 219 | readnext = 0 |
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| 220 | signal.alarm(0) |
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| 221 | self.printerInternalPageCounter = max(actualpagecount, self.printerInternalPageCounter) |
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| 222 | sock.close() |
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| 223 | |
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| 224 | def waitPrinting(self) : |
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| 225 | """Waits for printer status being 'printing'.""" |
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| 226 | firstvalue = None |
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| 227 | while 1: |
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| 228 | self.retrievePJLValues() |
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| 229 | if self.printerStatus in ('10023', '10003') : |
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| 230 | break |
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| 231 | if self.printerInternalPageCounter is not None : |
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| 232 | if firstvalue is None : |
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| 233 | # first time we retrieved a page counter, save it |
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| 234 | firstvalue = self.printerInternalPageCounter |
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| 235 | else : |
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| 236 | # second time (or later) |
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| 237 | if firstvalue < self.printerInternalPageCounter : |
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| 238 | # Here we have a printer which lies : |
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| 239 | # it says it is not printing or warming up |
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| 240 | # BUT the page counter increases !!! |
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| 241 | # So we can probably quit being sure it is printing. |
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| 242 | self.parent.filter.printInfo("Printer %s is lying to us !!!" % self.parent.filter.printername, "warn") |
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| 243 | break |
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| 244 | self.parent.filter.logdebug(_("Waiting for printer %s to be printing...") % self.parent.filter.printername) |
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| 245 | time.sleep(ITERATIONDELAY) |
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| 246 | |
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| 247 | def waitIdle(self) : |
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| 248 | """Waits for printer status being 'idle'.""" |
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| 249 | idle_num = idle_flag = 0 |
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| 250 | while 1 : |
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| 251 | self.retrievePJLValues() |
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| 252 | idle_flag = 0 |
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| 253 | if self.printerStatus in ('10000', '10001', '35078') : |
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| 254 | idle_flag = 1 |
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| 255 | if idle_flag : |
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| 256 | idle_num += 1 |
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| 257 | if idle_num > STABILIZATIONDELAY : |
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| 258 | # printer status is stable, we can exit |
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| 259 | break |
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| 260 | else : |
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| 261 | idle_num = 0 |
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| 262 | self.parent.filter.logdebug(_("Waiting for printer %s's idle status to stabilize...") % self.parent.filter.printername) |
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| 263 | time.sleep(ITERATIONDELAY) |
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| 264 | |
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| 265 | class Accounter(AccounterBase) : |
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| 266 | def __init__(self, kotabackend, arguments) : |
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| 267 | """Initializes querying accounter.""" |
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| 268 | AccounterBase.__init__(self, kotabackend, arguments) |
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| 269 | self.isSoftware = 0 |
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| 270 | |
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| 271 | def getPrinterInternalPageCounter(self) : |
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| 272 | """Returns the printer's internal page counter.""" |
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| 273 | self.filter.logdebug("Reading printer %s's internal page counter..." % self.filter.printername) |
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| 274 | counter = self.askPrinterPageCounter(self.filter.printerhostname) |
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| 275 | self.filter.logdebug("Printer %s's internal page counter value is : %s" % (self.filter.printername, str(counter))) |
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| 276 | return counter |
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| 277 | |
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| 278 | def beginJob(self, printer) : |
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| 279 | """Saves printer internal page counter at start of job.""" |
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| 280 | # save page counter before job |
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| 281 | self.LastPageCounter = self.getPrinterInternalPageCounter() |
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| 282 | self.fakeBeginJob() |
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| 283 | |
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| 284 | def fakeBeginJob(self) : |
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| 285 | """Fakes a begining of a job.""" |
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| 286 | self.counterbefore = self.getLastPageCounter() |
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| 287 | |
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| 288 | def endJob(self, printer) : |
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| 289 | """Saves printer internal page counter at end of job.""" |
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| 290 | # save page counter after job |
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| 291 | self.LastPageCounter = self.counterafter = self.getPrinterInternalPageCounter() |
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| 292 | |
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| 293 | def getJobSize(self, printer) : |
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| 294 | """Returns the actual job size.""" |
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| 295 | if (not self.counterbefore) or (not self.counterafter) : |
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| 296 | # there was a problem retrieving page counter |
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| 297 | self.filter.printInfo(_("A problem occured while reading printer %s's internal page counter.") % printer.Name, "warn") |
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| 298 | if printer.LastJob.Exists : |
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| 299 | # if there's a previous job, use the last value from database |
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| 300 | self.filter.printInfo(_("Retrieving printer %s's page counter from database instead.") % printer.Name, "warn") |
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| 301 | if not self.counterbefore : |
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| 302 | self.counterbefore = printer.LastJob.PrinterPageCounter or 0 |
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| 303 | if not self.counterafter : |
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| 304 | self.counterafter = printer.LastJob.PrinterPageCounter or 0 |
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| 305 | before = min(self.counterbefore, self.counterafter) |
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| 306 | after = max(self.counterbefore, self.counterafter) |
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| 307 | self.counterbefore = before |
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| 308 | self.counterafter = after |
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| 309 | if (not self.counterbefore) or (not self.counterafter) or (self.counterbefore == self.counterafter) : |
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| 310 | self.filter.printInfo(_("Couldn't retrieve printer %s's internal page counter either before or after printing.") % printer.Name, "warn") |
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| 311 | self.filter.printInfo(_("Job's size forced to 1 page for printer %s.") % printer.Name, "warn") |
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| 312 | self.counterbefore = 0 |
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| 313 | self.counterafter = 1 |
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| 314 | else : |
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| 315 | self.filter.printInfo(_("No previous job in database for printer %s.") % printer.Name, "warn") |
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| 316 | self.filter.printInfo(_("Job's size forced to 1 page for printer %s.") % printer.Name, "warn") |
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| 317 | self.counterbefore = 0 |
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| 318 | self.counterafter = 1 |
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| 319 | |
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| 320 | jobsize = (self.counterafter - self.counterbefore) |
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| 321 | if jobsize < 0 : |
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| 322 | # Try to take care of HP printers |
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| 323 | # Their internal page counter is saved to NVRAM |
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| 324 | # only every 10 pages. If the printer was switched |
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| 325 | # off then back on during the job, and that the |
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| 326 | # counters difference is negative, we know |
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| 327 | # the formula (we can't know if more than eleven |
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| 328 | # pages were printed though) : |
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| 329 | if jobsize > -10 : |
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| 330 | jobsize += 10 |
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| 331 | else : |
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| 332 | # here we may have got a printer being replaced |
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| 333 | # DURING the job. This is HIGHLY improbable ! |
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| 334 | self.filter.printInfo(_("Inconsistent values for printer %s's internal page counter.") % printer.Name, "warn") |
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| 335 | self.filter.printInfo(_("Job's size forced to 1 page for printer %s.") % printer.Name, "warn") |
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| 336 | jobsize = 1 |
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| 337 | return jobsize |
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| 338 | |
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| 339 | def askPrinterPageCounter(self, printer) : |
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| 340 | """Returns the page counter from the printer via an external command. |
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| 341 | |
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| 342 | The external command must report the life time page number of the printer on stdout. |
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| 343 | """ |
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| 344 | commandline = self.arguments.strip() % locals() |
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| 345 | cmdlower = commandline.lower() |
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| 346 | if cmdlower == "snmp" : |
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| 347 | if hasSNMP : |
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| 348 | return self.askWithSNMP(printer) |
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| 349 | else : |
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| 350 | raise PyKotaAccounterError, _("Internal SNMP accounting asked, but Python-SNMP is not available. Please download it from http://pysnmp.sourceforge.net") |
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| 351 | elif cmdlower == "pjl" : |
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| 352 | return self.askWithPJL(printer) |
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| 353 | |
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| 354 | if printer is None : |
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| 355 | raise PyKotaAccounterError, _("Unknown printer address in HARDWARE(%s) for printer %s") % (commandline, self.filter.printername) |
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| 356 | while 1 : |
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| 357 | self.filter.printInfo(_("Launching HARDWARE(%s)...") % commandline) |
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| 358 | pagecounter = None |
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| 359 | child = popen2.Popen4(commandline) |
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| 360 | try : |
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| 361 | answer = child.fromchild.read() |
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| 362 | except IOError : |
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| 363 | # we were interrupted by a signal, certainely a SIGTERM |
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| 364 | # caused by the user cancelling the current job |
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| 365 | try : |
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| 366 | os.kill(child.pid, signal.SIGTERM) |
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| 367 | except : |
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| 368 | pass # already killed ? |
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| 369 | self.filter.printInfo(_("SIGTERM was sent to hardware accounter %s (pid: %s)") % (commandline, child.pid)) |
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| 370 | else : |
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| 371 | lines = [l.strip() for l in answer.split("\n")] |
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| 372 | for i in range(len(lines)) : |
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| 373 | try : |
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| 374 | pagecounter = int(lines[i]) |
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| 375 | except (AttributeError, ValueError) : |
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| 376 | self.filter.printInfo(_("Line [%s] skipped in accounter's output. Trying again...") % lines[i]) |
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| 377 | else : |
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| 378 | break |
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| 379 | child.fromchild.close() |
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| 380 | child.tochild.close() |
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| 381 | try : |
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| 382 | status = child.wait() |
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| 383 | except OSError, msg : |
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| 384 | self.filter.logdebug("Error while waiting for hardware accounter pid %s : %s" % (child.pid, msg)) |
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| 385 | else : |
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| 386 | if os.WIFEXITED(status) : |
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| 387 | status = os.WEXITSTATUS(status) |
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| 388 | self.filter.printInfo(_("Hardware accounter %s exit code is %s") % (self.arguments, str(status))) |
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| 389 | |
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| 390 | if pagecounter is None : |
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| 391 | message = _("Unable to query printer %s via HARDWARE(%s)") % (printer, commandline) |
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| 392 | if self.onerror == "CONTINUE" : |
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| 393 | self.filter.printInfo(message, "error") |
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| 394 | else : |
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| 395 | raise PyKotaAccounterError, message |
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| 396 | else : |
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| 397 | return pagecounter |
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| 398 | |
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| 399 | def askWithSNMP(self, printer) : |
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| 400 | """Returns the page counter from the printer via internal SNMP handling.""" |
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| 401 | acc = SNMPAccounter(self, printer) |
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| 402 | try : |
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| 403 | if (os.environ.get("PYKOTASTATUS") != "CANCELLED") and \ |
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| 404 | (os.environ.get("PYKOTAACTION") != "DENY") and \ |
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| 405 | (os.environ.get("PYKOTAPHASE") == "AFTER") and \ |
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| 406 | self.filter.jobSizeBytes : |
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| 407 | acc.waitPrinting() |
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| 408 | acc.waitIdle() |
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| 409 | except : |
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| 410 | if acc.printerInternalPageCounter is None : |
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| 411 | raise |
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| 412 | else : |
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| 413 | self.filter.printInfo(_("SNMP querying stage interrupted. Using latest value seen for internal page counter (%s) on printer %s.") % (acc.printerInternalPageCounter, self.filter.printername), "warn") |
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| 414 | return acc.printerInternalPageCounter |
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| 415 | |
|---|
| 416 | def askWithPJL(self, printer) : |
|---|
| 417 | """Returns the page counter from the printer via internal PJL handling.""" |
|---|
| 418 | acc = PJLAccounter(self, printer) |
|---|
| 419 | try : |
|---|
| 420 | if (os.environ.get("PYKOTASTATUS") != "CANCELLED") and \ |
|---|
| 421 | (os.environ.get("PYKOTAACTION") != "DENY") and \ |
|---|
| 422 | (os.environ.get("PYKOTAPHASE") == "AFTER") and \ |
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| 423 | self.filter.jobSizeBytes : |
|---|
| 424 | acc.waitPrinting() |
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| 425 | acc.waitIdle() |
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| 426 | except : |
|---|
| 427 | if acc.printerInternalPageCounter is None : |
|---|
| 428 | raise |
|---|
| 429 | else : |
|---|
| 430 | self.filter.printInfo(_("PJL querying stage interrupted. Using latest value seen for internal page counter (%s) on printer %s.") % (acc.printerInternalPageCounter, self.filter.printername), "warn") |
|---|
| 431 | return acc.printerInternalPageCounter |
|---|
