| 1 | #! /usr/bin/env python |
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| 2 | # -*- coding: ISO-8859-15 -*- |
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| 3 | |
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| 4 | # CUPSPyKota accounting backend |
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| 5 | # |
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| 6 | # PyKota - Print Quotas for CUPS and LPRng |
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| 7 | # |
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| 8 | # (c) 2003, 2004, 2005 Jerome Alet <alet@librelogiciel.com> |
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| 9 | # This program is free software; you can redistribute it and/or modify |
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| 10 | # it under the terms of the GNU General Public License as published by |
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| 11 | # the Free Software Foundation; either version 2 of the License, or |
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| 12 | # (at your option) any later version. |
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| 13 | # |
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| 14 | # This program is distributed in the hope that it will be useful, |
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| 15 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | # GNU General Public License for more details. |
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| 18 | # |
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| 19 | # You should have received a copy of the GNU General Public License |
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| 20 | # along with this program; if not, write to the Free Software |
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| 21 | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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| 22 | # |
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| 23 | # $Id$ |
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| 24 | # |
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| 25 | # |
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| 26 | |
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| 27 | import sys |
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| 28 | import os |
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| 29 | import errno |
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| 30 | import tempfile |
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| 31 | import popen2 |
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| 32 | import cStringIO |
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| 33 | import shlex |
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| 34 | import select |
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| 35 | import signal |
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| 36 | import time |
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| 37 | |
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| 38 | from pykota.tool import PyKotaFilterOrBackend, PyKotaToolError, crashed |
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| 39 | from pykota.config import PyKotaConfigError |
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| 40 | from pykota.storage import PyKotaStorageError |
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| 41 | from pykota.accounter import PyKotaAccounterError |
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| 42 | from pykota.ipp import IPPMessage, IPPError |
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| 43 | |
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| 44 | class PyKotaPopen4(popen2.Popen4) : |
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| 45 | """Our own class to execute real backends. |
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| 46 | |
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| 47 | Their first argument is different from their path so using |
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| 48 | native popen2.Popen3 would not be feasible. |
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| 49 | """ |
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| 50 | def __init__(self, cmd, bufsize=-1, arg0=None) : |
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| 51 | self.arg0 = arg0 |
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| 52 | popen2.Popen4.__init__(self, cmd, bufsize) |
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| 53 | |
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| 54 | def _run_child(self, cmd): |
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| 55 | try : |
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| 56 | MAXFD = os.sysconf("SC_OPEN_MAX") |
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| 57 | except (AttributeError, ValueError) : |
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| 58 | MAXFD = 256 |
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| 59 | for i in range(3, MAXFD) : |
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| 60 | try: |
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| 61 | os.close(i) |
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| 62 | except OSError: |
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| 63 | pass |
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| 64 | try: |
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| 65 | os.execvpe(cmd[0], [self.arg0 or cmd[0]] + cmd[1:], os.environ) |
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| 66 | finally: |
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| 67 | os._exit(1) |
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| 68 | |
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| 69 | class PyKotaBackend(PyKotaFilterOrBackend) : |
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| 70 | """A class for the pykota backend.""" |
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| 71 | def acceptJob(self) : |
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| 72 | """Returns the appropriate exit code to tell CUPS all is OK.""" |
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| 73 | return 0 |
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| 74 | |
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| 75 | def removeJob(self) : |
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| 76 | """Returns the appropriate exit code to let CUPS think all is OK. |
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| 77 | |
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| 78 | Returning 0 (success) prevents CUPS from stopping the print queue. |
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| 79 | """ |
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| 80 | return 0 |
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| 81 | |
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| 82 | def genBanner(self, bannerfileorcommand) : |
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| 83 | """Reads a banner or generates one through an external command. |
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| 84 | |
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| 85 | Returns the banner's content in a format which MUST be accepted |
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| 86 | by the printer. |
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| 87 | """ |
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| 88 | if bannerfileorcommand : |
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| 89 | banner = "" # no banner by default |
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| 90 | if os.access(bannerfileorcommand, os.X_OK) or not os.path.isfile(bannerfileorcommand) : |
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| 91 | self.logdebug("Launching %s to generate a banner." % bannerfileorcommand) |
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| 92 | child = popen2.Popen3(bannerfileorcommand, capturestderr=1) |
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| 93 | banner = child.fromchild.read() |
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| 94 | child.tochild.close() |
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| 95 | child.childerr.close() |
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| 96 | child.fromchild.close() |
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| 97 | status = child.wait() |
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| 98 | if os.WIFEXITED(status) : |
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| 99 | status = os.WEXITSTATUS(status) |
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| 100 | self.printInfo(_("Banner generator %s exit code is %s") % (bannerfileorcommand, str(status))) |
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| 101 | else : |
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| 102 | self.logdebug("Using %s as the banner." % bannerfileorcommand) |
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| 103 | try : |
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| 104 | fh = open(bannerfileorcommand, 'r') |
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| 105 | except IOError, msg : |
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| 106 | self.printInfo("Impossible to open %s : %s" % (bannerfileorcommand, msg), "error") |
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| 107 | else : |
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| 108 | banner = fh.read() |
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| 109 | fh.close() |
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| 110 | if banner : |
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| 111 | return cStringIO.StringIO(banner) |
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| 112 | |
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| 113 | def startingBanner(self, printername) : |
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| 114 | """Retrieves a starting banner for current printer and returns its content.""" |
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| 115 | self.logdebug("Retrieving starting banner...") |
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| 116 | return self.genBanner(self.config.getStartingBanner(printername)) |
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| 117 | |
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| 118 | def endingBanner(self, printername) : |
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| 119 | """Retrieves an ending banner for current printer and returns its content.""" |
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| 120 | self.logdebug("Retrieving ending banner...") |
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| 121 | return self.genBanner(self.config.getEndingBanner(printername)) |
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| 122 | |
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| 123 | def getCupsConfigDirectives(self, directives=[]) : |
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| 124 | """Retrieves some CUPS directives from its configuration file. |
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| 125 | |
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| 126 | Returns a mapping with lowercased directives as keys and |
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| 127 | their setting as values. |
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| 128 | """ |
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| 129 | dirvalues = {} |
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| 130 | cupsroot = os.environ.get("CUPS_SERVERROOT", "/etc/cups") |
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| 131 | cupsdconf = os.path.join(cupsroot, "cupsd.conf") |
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| 132 | try : |
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| 133 | conffile = open(cupsdconf, "r") |
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| 134 | except IOError : |
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| 135 | self.logdebug("Unable to open %s" % cupsdconf) |
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| 136 | else : |
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| 137 | for line in conffile.readlines() : |
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| 138 | linecopy = line.strip().lower() |
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| 139 | for di in [d.lower() for d in directives] : |
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| 140 | if linecopy.startswith("%s " % di) : |
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| 141 | try : |
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| 142 | val = line.split()[1] |
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| 143 | except : |
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| 144 | pass # ignore errors, we take the last value in any case. |
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| 145 | else : |
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| 146 | dirvalues[di] = val |
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| 147 | conffile.close() |
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| 148 | return dirvalues |
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| 149 | |
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| 150 | def getJobInfosFromPageLog(self, cupsconfig, printername, username, jobid) : |
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| 151 | """Retrieves the job-originating-hostname and job-billing attributes from the CUPS page_log file if possible.""" |
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| 152 | pagelogpath = cupsconfig.get("pagelog", "/var/log/cups/page_log") |
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| 153 | self.logdebug("Trying to extract job-originating-host-name from %s" % pagelogpath) |
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| 154 | try : |
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| 155 | pagelog = open(pagelogpath, "r") |
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| 156 | except IOError : |
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| 157 | self.logdebug("Unable to open %s" % pagelogpath) |
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| 158 | return (None, None) # no page log or can't read it, originating hostname unknown yet |
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| 159 | else : |
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| 160 | # TODO : read backward so we could take first value seen |
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| 161 | # TODO : here we read forward so we must take the last value seen |
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| 162 | prefix = ("%s %s %s " % (printername, username, jobid)).lower() |
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| 163 | matchingline = None |
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| 164 | while 1 : |
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| 165 | line = pagelog.readline() |
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| 166 | if not line : |
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| 167 | break |
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| 168 | else : |
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| 169 | line = line.strip() |
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| 170 | if line.lower().startswith(prefix) : |
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| 171 | matchingline = line # no break, because we read forward |
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| 172 | pagelog.close() |
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| 173 | if matchingline is None : |
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| 174 | self.logdebug("No matching line found in %s" % pagelogpath) |
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| 175 | return (None, None) # correct line not found, job-originating-host-name unknown |
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| 176 | else : |
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| 177 | (jobbilling, hostname) = matchingline.split()[-2:] |
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| 178 | if jobbilling == "-" : |
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| 179 | jobbilling = "" |
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| 180 | return (jobbilling, hostname) |
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| 181 | |
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| 182 | def doWork(self, policy, printer, user, userpquota) : |
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| 183 | """Most of the work is done here.""" |
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| 184 | # Two different values possible for policy here : |
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| 185 | # ALLOW means : Either printer, user or user print quota doesn't exist, |
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| 186 | # but the job should be allowed anyway. |
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| 187 | # OK means : Both printer, user and user print quota exist, job should |
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| 188 | # be allowed if current user is allowed to print on this printer |
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| 189 | if policy == "OK" : |
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| 190 | # exports user information with initial values |
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| 191 | self.exportUserInfo(userpquota) |
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| 192 | |
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| 193 | # tries to extract job-originating-host-name and other information |
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| 194 | self.regainPriv() |
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| 195 | cupsdconf = self.getCupsConfigDirectives(["PageLog", "RequestRoot"]) |
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| 196 | requestroot = cupsdconf.get("requestroot", "/var/spool/cups") |
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| 197 | if (len(self.jobid) < 5) and self.jobid.isdigit() : |
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| 198 | ippmessagefile = "c%05i" % int(self.jobid) |
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| 199 | else : |
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| 200 | ippmessagefile = "c%s" % self.jobid |
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| 201 | ippmessagefile = os.path.join(requestroot, ippmessagefile) |
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| 202 | ippmessage = {} |
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| 203 | try : |
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| 204 | ippdatafile = open(ippmessagefile) |
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| 205 | except : |
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| 206 | self.printInfo("Unable to open IPP message file %s" % ippmessagefile, "warn") |
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| 207 | else : |
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| 208 | self.logdebug("Parsing of IPP message file %s begins." % ippmessagefile) |
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| 209 | try : |
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| 210 | ippmessage = IPPMessage(ippdatafile.read()) |
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| 211 | except PyKotaIPPError, msg : |
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| 212 | self.printInfo("Error while parsing %s : %s" % (ippmessagefile, msg), "warn") |
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| 213 | else : |
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| 214 | self.logdebug("Parsing of IPP message file %s ends." % ippmessagefile) |
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| 215 | ippdatafile.close() |
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| 216 | self.dropPriv() |
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| 217 | |
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| 218 | try : |
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| 219 | (chtype, clienthost) = ippmessage.operation_attributes.get("job-originating-host-name", \ |
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| 220 | ippmessage.job_attributes.get("job-originating-host-name", (None, None))) |
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| 221 | (jbtype, billingcode) = ippmessage.job_attributes.get("job-billing", (None, None)) |
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| 222 | except AttributeError : |
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| 223 | clienthost = None |
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| 224 | billingcode = None |
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| 225 | if clienthost is None : |
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| 226 | (billingcode, clienthost) = self.getJobInfosFromPageLog(cupsdconf, printer.Name, user.Name, self.jobid) |
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| 227 | self.logdebug("Client Hostname : %s" % (clienthost or "Unknown")) |
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| 228 | self.logdebug("Billing Code : %s" % (billingcode or "None")) |
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| 229 | |
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| 230 | os.environ["PYKOTAJOBORIGINATINGHOSTNAME"] = str(clienthost or "") |
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| 231 | os.environ["PYKOTAJOBBILLING"] = str(billingcode or "") |
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| 232 | |
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| 233 | # enters first phase |
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| 234 | os.environ["PYKOTAPHASE"] = "BEFORE" |
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| 235 | |
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| 236 | # precomputes the job's price |
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| 237 | self.softwareJobPrice = userpquota.computeJobPrice(self.softwareJobSize) |
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| 238 | os.environ["PYKOTAPRECOMPUTEDJOBPRICE"] = str(self.softwareJobPrice) |
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| 239 | self.logdebug("Precomputed job's size is %s pages, price is %s units" % (self.softwareJobSize, self.softwareJobPrice)) |
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| 240 | |
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| 241 | denyduplicates = self.config.getDenyDuplicates(printer.Name) |
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| 242 | if not self.jobSizeBytes : |
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| 243 | # if no data to pass to real backend, probably a filter |
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| 244 | # higher in the chain failed because of a misconfiguration. |
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| 245 | # we deny the job in this case (nothing to print anyway) |
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| 246 | self.printMoreInfo(user, printer, _("Job contains no data. Printing is denied."), "warn") |
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| 247 | action = "DENY" |
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| 248 | elif denyduplicates \ |
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| 249 | and printer.LastJob.Exists \ |
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| 250 | and (printer.LastJob.UserName == user.Name) \ |
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| 251 | and (printer.LastJob.JobMD5Sum == self.checksum) : |
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| 252 | if denyduplicates == 1 : |
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| 253 | self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is denied."), "warn") |
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| 254 | action = "DENY" |
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| 255 | else : |
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| 256 | self.logdebug("Launching subprocess [%s] to see if dupes should be allowed or not." % denyduplicates) |
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| 257 | fanswer = os.popen(denyduplicates, "r") |
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| 258 | action = fanswer.read().strip().upper() |
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| 259 | fanswer.close() |
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| 260 | if action == "DENY" : |
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| 261 | self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is denied by subprocess."), "warn") |
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| 262 | else : |
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| 263 | self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is allowed by subprocess."), "warn") |
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| 264 | action = "ALLOW" # just to be sure, in the case the external command returns something else... |
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| 265 | else : |
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| 266 | # checks the user's quota |
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| 267 | action = self.warnUserPQuota(userpquota) |
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| 268 | |
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| 269 | # exports some new environment variables |
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| 270 | os.environ["PYKOTAACTION"] = action |
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| 271 | |
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| 272 | # launches the pre hook |
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| 273 | self.prehook(userpquota) |
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| 274 | |
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| 275 | # saves the size of banners which have to be accounted for |
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| 276 | # this is needed in the case of software accounting |
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| 277 | bannersize = 0 |
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| 278 | |
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| 279 | # handle starting banner pages before accounting |
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| 280 | accountbanner = self.config.getAccountBanner(printer.Name) |
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| 281 | if accountbanner in ["ENDING", "NONE"] : |
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| 282 | if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) : |
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| 283 | self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn") |
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| 284 | else : |
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| 285 | if action == 'DENY' : |
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| 286 | self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name)) |
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| 287 | userpquota.incDenyBannerCounter() # increments the warning counter |
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| 288 | self.exportUserInfo(userpquota) |
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| 289 | banner = self.startingBanner(printer.Name) |
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| 290 | if banner : |
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| 291 | self.logdebug("Printing starting banner before accounting begins.") |
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| 292 | self.handleData(banner) |
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| 293 | |
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| 294 | self.printMoreInfo(user, printer, _("Job accounting begins.")) |
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| 295 | self.accounter.beginJob(printer) |
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| 296 | |
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| 297 | # handle starting banner pages during accounting |
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| 298 | if accountbanner in ["STARTING", "BOTH"] : |
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| 299 | if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) : |
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| 300 | self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn") |
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| 301 | else : |
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| 302 | if action == 'DENY' : |
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| 303 | self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name)) |
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| 304 | userpquota.incDenyBannerCounter() # increments the warning counter |
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| 305 | self.exportUserInfo(userpquota) |
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| 306 | banner = self.startingBanner(printer.Name) |
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| 307 | if banner : |
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| 308 | self.logdebug("Printing starting banner during accounting.") |
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| 309 | self.handleData(banner) |
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| 310 | if self.accounter.isSoftware : |
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| 311 | bannersize += 1 # TODO : fix this by passing the banner's content through PDLAnalyzer |
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| 312 | else : |
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| 313 | action = "ALLOW" |
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| 314 | os.environ["PYKOTAACTION"] = action |
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| 315 | |
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| 316 | # pass the job's data to the real backend |
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| 317 | if action in ["ALLOW", "WARN"] : |
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| 318 | if self.gotSigTerm : |
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| 319 | retcode = self.removeJob() |
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| 320 | else : |
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| 321 | retcode = self.handleData() |
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| 322 | else : |
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| 323 | retcode = self.removeJob() |
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| 324 | |
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| 325 | if policy == "OK" : |
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| 326 | # indicate phase change |
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| 327 | os.environ["PYKOTAPHASE"] = "AFTER" |
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| 328 | |
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| 329 | # handle ending banner pages during accounting |
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| 330 | if accountbanner in ["ENDING", "BOTH"] : |
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| 331 | if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) : |
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| 332 | self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn") |
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| 333 | else : |
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| 334 | if action == 'DENY' : |
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| 335 | self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name)) |
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| 336 | userpquota.incDenyBannerCounter() # increments the warning counter |
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| 337 | self.exportUserInfo(userpquota) |
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| 338 | banner = self.endingBanner(printer.Name) |
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| 339 | if banner : |
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| 340 | self.logdebug("Printing ending banner during accounting.") |
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| 341 | self.handleData(banner) |
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| 342 | if self.accounter.isSoftware : |
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| 343 | bannersize += 1 # TODO : fix this by passing the banner's content through PDLAnalyzer |
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| 344 | |
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| 345 | # stops accounting. |
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| 346 | self.accounter.endJob(printer) |
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| 347 | self.printMoreInfo(user, printer, _("Job accounting ends.")) |
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| 348 | |
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| 349 | # retrieve the job size |
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| 350 | if action == "DENY" : |
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| 351 | jobsize = 0 |
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| 352 | self.printMoreInfo(user, printer, _("Job size forced to 0 because printing is denied.")) |
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| 353 | else : |
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| 354 | userpquota.resetDenyBannerCounter() |
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| 355 | jobsize = self.accounter.getJobSize(printer) |
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| 356 | if self.softwareJobSize and (jobsize != self.softwareJobSize) : |
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| 357 | self.printInfo(_("Beware : computed job size (%s) != precomputed job size (%s)") % (jobsize, self.softwareJobSize), "error") |
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| 358 | (limit, replacement) = self.config.getTrustJobSize(printer.Name) |
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| 359 | if limit is None : |
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| 360 | self.printInfo(_("The job size will be trusted anyway according to the 'trustjobsize' directive"), "warn") |
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| 361 | else : |
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| 362 | if jobsize <= limit : |
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| 363 | self.printInfo(_("The job size will be trusted because it is inferior to the 'trustjobsize' directive's limit %s") % limit, "warn") |
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| 364 | else : |
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| 365 | self.printInfo(_("The job size will be modified according to the 'trustjobsize' directive : %s") % replacement, "warn") |
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| 366 | if replacement == "PRECOMPUTED" : |
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| 367 | jobsize = self.softwareJobSize |
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| 368 | else : |
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| 369 | jobsize = replacement |
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| 370 | jobsize += bannersize |
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| 371 | self.printMoreInfo(user, printer, _("Job size : %i") % jobsize) |
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| 372 | |
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| 373 | # update the quota for the current user on this printer |
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| 374 | self.printInfo(_("Updating user %s's quota on printer %s") % (user.Name, printer.Name)) |
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| 375 | jobprice = userpquota.increasePagesUsage(jobsize) |
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| 376 | |
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| 377 | # adds the current job to history |
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| 378 | printer.addJobToHistory(self.jobid, user, self.accounter.getLastPageCounter(), \ |
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| 379 | action, jobsize, jobprice, self.preserveinputfile, \ |
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| 380 | self.title, self.copies, self.options, clienthost, \ |
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| 381 | self.jobSizeBytes, self.checksum, None, billingcode) |
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| 382 | self.printMoreInfo(user, printer, _("Job added to history.")) |
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| 383 | |
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| 384 | # exports some new environment variables |
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| 385 | os.environ["PYKOTAJOBSIZE"] = str(jobsize) |
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| 386 | os.environ["PYKOTAJOBPRICE"] = str(jobprice) |
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| 387 | |
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| 388 | # then re-export user information with new value |
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| 389 | self.exportUserInfo(userpquota) |
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| 390 | |
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| 391 | # handle ending banner pages after accounting ends |
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| 392 | if accountbanner in ["STARTING", "NONE"] : |
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| 393 | if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) : |
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| 394 | self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn") |
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| 395 | else : |
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| 396 | if action == 'DENY' : |
|---|
| 397 | self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name)) |
|---|
| 398 | userpquota.incDenyBannerCounter() # increments the warning counter |
|---|
| 399 | self.exportUserInfo(userpquota) |
|---|
| 400 | banner = self.endingBanner(printer.Name) |
|---|
| 401 | if banner : |
|---|
| 402 | self.logdebug("Printing ending banner after accounting ends.") |
|---|
| 403 | self.handleData(banner) |
|---|
| 404 | |
|---|
| 405 | # Launches the post hook |
|---|
| 406 | self.posthook(userpquota) |
|---|
| 407 | |
|---|
| 408 | return retcode |
|---|
| 409 | |
|---|
| 410 | def unregisterFileNo(self, pollobj, fileno) : |
|---|
| 411 | """Removes a file handle from the polling object.""" |
|---|
| 412 | try : |
|---|
| 413 | pollobj.unregister(fileno) |
|---|
| 414 | except KeyError : |
|---|
| 415 | self.printInfo(_("File number %s unregistered twice from polling object, ignored.") % fileno, "warn") |
|---|
| 416 | except : |
|---|
| 417 | self.logdebug("Error while unregistering file number %s from polling object." % fileno) |
|---|
| 418 | else : |
|---|
| 419 | self.logdebug("File number %s unregistered from polling object." % fileno) |
|---|
| 420 | |
|---|
| 421 | def formatFileEvent(self, fd, mask) : |
|---|
| 422 | """Formats file debug info.""" |
|---|
| 423 | maskval = [] |
|---|
| 424 | if mask & select.POLLIN : |
|---|
| 425 | maskval.append("POLLIN") |
|---|
| 426 | if mask & select.POLLOUT : |
|---|
| 427 | maskval.append("POLLOUT") |
|---|
| 428 | if mask & select.POLLPRI : |
|---|
| 429 | maskval.append("POLLPRI") |
|---|
| 430 | if mask & select.POLLERR : |
|---|
| 431 | maskval.append("POLLERR") |
|---|
| 432 | if mask & select.POLLHUP : |
|---|
| 433 | maskval.append("POLLHUP") |
|---|
| 434 | if mask & select.POLLNVAL : |
|---|
| 435 | maskval.append("POLLNVAL") |
|---|
| 436 | return "%s (%s)" % (fd, " | ".join(maskval)) |
|---|
| 437 | |
|---|
| 438 | def handleData(self, filehandle=None) : |
|---|
| 439 | """Pass the job's data to the real backend.""" |
|---|
| 440 | # Find the real backend pathname |
|---|
| 441 | realbackend = os.path.join(os.path.split(sys.argv[0])[0], self.originalbackend) |
|---|
| 442 | |
|---|
| 443 | # And launch it |
|---|
| 444 | if filehandle is None : |
|---|
| 445 | arguments = sys.argv |
|---|
| 446 | else : |
|---|
| 447 | # Here we absolutely WANT to remove any filename from the command line ! |
|---|
| 448 | arguments = [ "Fake this because we are printing a banner" ] + sys.argv[1:6] |
|---|
| 449 | |
|---|
| 450 | self.regainPriv() |
|---|
| 451 | |
|---|
| 452 | self.logdebug("Starting real backend %s with args %s" % (realbackend, " ".join(['"%s"' % a for a in ([os.environ["DEVICE_URI"]] + arguments[1:])]))) |
|---|
| 453 | subprocess = PyKotaPopen4([realbackend] + arguments[1:], bufsize=0, arg0=os.environ["DEVICE_URI"]) |
|---|
| 454 | |
|---|
| 455 | # Save file descriptors, we will need them later. |
|---|
| 456 | stderrfno = sys.stderr.fileno() |
|---|
| 457 | fromcfno = subprocess.fromchild.fileno() |
|---|
| 458 | tocfno = subprocess.tochild.fileno() |
|---|
| 459 | |
|---|
| 460 | # We will have to be careful when dealing with I/O |
|---|
| 461 | # So we use a poll object to know when to read or write |
|---|
| 462 | pollster = select.poll() |
|---|
| 463 | pollster.register(fromcfno, select.POLLIN | select.POLLPRI) |
|---|
| 464 | pollster.register(stderrfno, select.POLLOUT) |
|---|
| 465 | pollster.register(tocfno, select.POLLOUT) |
|---|
| 466 | |
|---|
| 467 | # Initialize our buffers |
|---|
| 468 | indata = "" |
|---|
| 469 | outdata = "" |
|---|
| 470 | endinput = endoutput = 0 |
|---|
| 471 | inputclosed = outputclosed = 0 |
|---|
| 472 | totaltochild = totalfromcups = 0 |
|---|
| 473 | totalfromchild = totaltocups = 0 |
|---|
| 474 | |
|---|
| 475 | if filehandle is None: |
|---|
| 476 | if self.preserveinputfile is None : |
|---|
| 477 | # this is not a real file, we read the job's data |
|---|
| 478 | # from our temporary file which is a copy of stdin |
|---|
| 479 | infno = self.jobdatastream.fileno() |
|---|
| 480 | self.jobdatastream.seek(0) |
|---|
| 481 | pollster.register(infno, select.POLLIN | select.POLLPRI) |
|---|
| 482 | else : |
|---|
| 483 | # job's data is in a file, no need to pass the data |
|---|
| 484 | # to the real backend |
|---|
| 485 | self.logdebug("Job's data is in %s" % self.preserveinputfile) |
|---|
| 486 | infno = None |
|---|
| 487 | endinput = 1 |
|---|
| 488 | else: |
|---|
| 489 | self.logdebug("Printing data passed from filehandle") |
|---|
| 490 | indata = filehandle.read() |
|---|
| 491 | infno = None |
|---|
| 492 | endinput = 1 |
|---|
| 493 | filehandle.close() |
|---|
| 494 | |
|---|
| 495 | self.logdebug("Entering streams polling loop...") |
|---|
| 496 | MEGABYTE = 1024*1024 |
|---|
| 497 | killed = 0 |
|---|
| 498 | status = -1 |
|---|
| 499 | while (status == -1) and (not killed) and not (inputclosed and outputclosed) : |
|---|
| 500 | # First check if original backend is still alive |
|---|
| 501 | status = subprocess.poll() |
|---|
| 502 | |
|---|
| 503 | # Now if we got SIGTERM, we have |
|---|
| 504 | # to kill -TERM the original backend |
|---|
| 505 | if self.gotSigTerm and not killed : |
|---|
| 506 | try : |
|---|
| 507 | os.kill(subprocess.pid, signal.SIGTERM) |
|---|
| 508 | except OSError, msg : # ignore but logs if process was already killed. |
|---|
| 509 | self.logdebug("Error while sending signal to pid %s : %s" % (subprocess.pid, msg)) |
|---|
| 510 | else : |
|---|
| 511 | self.printInfo(_("SIGTERM was sent to real backend %s (pid: %s)") % (realbackend, subprocess.pid)) |
|---|
| 512 | killed = 1 |
|---|
| 513 | |
|---|
| 514 | # In any case, deal with any remaining I/O |
|---|
| 515 | try : |
|---|
| 516 | availablefds = pollster.poll(5000) |
|---|
| 517 | except select.error, msg : |
|---|
| 518 | self.logdebug("Interrupted poll : %s" % msg) |
|---|
| 519 | availablefds = [] |
|---|
| 520 | if not availablefds : |
|---|
| 521 | self.logdebug("Nothing to do, sleeping a bit...") |
|---|
| 522 | time.sleep(0.01) # give some time to the system |
|---|
| 523 | else : |
|---|
| 524 | for (fd, mask) in availablefds : |
|---|
| 525 | # self.logdebug(self.formatFileEvent(fd, mask)) |
|---|
| 526 | try : |
|---|
| 527 | if mask & select.POLLOUT : |
|---|
| 528 | # We can write |
|---|
| 529 | if fd == tocfno : |
|---|
| 530 | if indata : |
|---|
| 531 | try : |
|---|
| 532 | nbwritten = os.write(fd, indata) |
|---|
| 533 | except (OSError, IOError), msg : |
|---|
| 534 | self.logdebug("Error while writing to real backend's stdin %s : %s" % (fd, msg)) |
|---|
| 535 | else : |
|---|
| 536 | if len(indata) != nbwritten : |
|---|
| 537 | self.logdebug("Short write to real backend's input !") |
|---|
| 538 | totaltochild += nbwritten |
|---|
| 539 | self.logdebug("%s bytes sent to real backend so far..." % totaltochild) |
|---|
| 540 | indata = indata[nbwritten:] |
|---|
| 541 | else : |
|---|
| 542 | self.logdebug("No data to send to real backend yet, sleeping a bit...") |
|---|
| 543 | time.sleep(0.01) |
|---|
| 544 | |
|---|
| 545 | if endinput : |
|---|
| 546 | self.unregisterFileNo(pollster, tocfno) |
|---|
| 547 | self.logdebug("Closing real backend's stdin.") |
|---|
| 548 | os.close(tocfno) |
|---|
| 549 | inputclosed = 1 |
|---|
| 550 | elif fd == stderrfno : |
|---|
| 551 | if outdata : |
|---|
| 552 | try : |
|---|
| 553 | nbwritten = os.write(fd, outdata) |
|---|
| 554 | except (OSError, IOError), msg : |
|---|
| 555 | self.logdebug("Error while writing to CUPS back channel (stderr) %s : %s" % (fd, msg)) |
|---|
| 556 | else : |
|---|
| 557 | if len(outdata) != nbwritten : |
|---|
| 558 | self.logdebug("Short write to stderr (CUPS) !") |
|---|
| 559 | totaltocups += nbwritten |
|---|
| 560 | self.logdebug("%s bytes sent back to CUPS so far..." % totaltocups) |
|---|
| 561 | outdata = outdata[nbwritten:] |
|---|
| 562 | else : |
|---|
| 563 | # self.logdebug("No data to send back to CUPS yet, sleeping a bit...") # Uncommenting this fills your logs |
|---|
| 564 | time.sleep(0.01) # Give some time to the system, stderr is ALWAYS writeable it seems. |
|---|
| 565 | |
|---|
| 566 | if endoutput : |
|---|
| 567 | self.unregisterFileNo(pollster, stderrfno) |
|---|
| 568 | outputclosed = 1 |
|---|
| 569 | else : |
|---|
| 570 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
|---|
| 571 | time.sleep(0.01) |
|---|
| 572 | |
|---|
| 573 | if mask & (select.POLLIN | select.POLLPRI) : |
|---|
| 574 | # We have something to read |
|---|
| 575 | try : |
|---|
| 576 | data = os.read(fd, MEGABYTE) |
|---|
| 577 | except (IOError, OSError), msg : |
|---|
| 578 | self.logdebug("Error while reading file %s : %s" % (fd, msg)) |
|---|
| 579 | else : |
|---|
| 580 | if fd == infno : |
|---|
| 581 | if not data : # If yes, then no more input data |
|---|
| 582 | self.unregisterFileNo(pollster, infno) |
|---|
| 583 | self.logdebug("Input data ends.") |
|---|
| 584 | endinput = 1 # this happens with real files. |
|---|
| 585 | else : |
|---|
| 586 | indata += data |
|---|
| 587 | totalfromcups += len(data) |
|---|
| 588 | self.logdebug("%s bytes read from CUPS so far..." % totalfromcups) |
|---|
| 589 | elif fd == fromcfno : |
|---|
| 590 | if not data : |
|---|
| 591 | self.logdebug("No back channel data to read from real backend yet, sleeping a bit...") |
|---|
| 592 | time.sleep(0.01) |
|---|
| 593 | else : |
|---|
| 594 | outdata += data |
|---|
| 595 | totalfromchild += len(data) |
|---|
| 596 | self.logdebug("%s bytes read from real backend so far..." % totalfromchild) |
|---|
| 597 | else : |
|---|
| 598 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
|---|
| 599 | time.sleep(0.01) |
|---|
| 600 | |
|---|
| 601 | if mask & (select.POLLHUP | select.POLLERR) : |
|---|
| 602 | # Treat POLLERR as an EOF. |
|---|
| 603 | # Some standard I/O stream has no more datas |
|---|
| 604 | self.unregisterFileNo(pollster, fd) |
|---|
| 605 | if fd == infno : |
|---|
| 606 | # Here we are in the case where the input file is stdin. |
|---|
| 607 | # which has no more data to be read. |
|---|
| 608 | self.logdebug("Input data ends.") |
|---|
| 609 | endinput = 1 |
|---|
| 610 | elif fd == fromcfno : |
|---|
| 611 | # We are no more interested in this file descriptor |
|---|
| 612 | self.logdebug("Closing real backend's stdout+stderr.") |
|---|
| 613 | os.close(fromcfno) |
|---|
| 614 | endoutput = 1 |
|---|
| 615 | else : |
|---|
| 616 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
|---|
| 617 | time.sleep(0.01) |
|---|
| 618 | |
|---|
| 619 | if mask & select.POLLNVAL : |
|---|
| 620 | self.logdebug("File %s was closed. Unregistering from polling object." % fd) |
|---|
| 621 | self.unregisterFileNo(pollster, fd) |
|---|
| 622 | except IOError, msg : |
|---|
| 623 | self.logdebug("Got an IOError : %s" % msg) # we got signalled during an I/O |
|---|
| 624 | |
|---|
| 625 | # We must close the real backend's input stream |
|---|
| 626 | if killed and not inputclosed : |
|---|
| 627 | self.logdebug("Forcing close of real backend's stdin.") |
|---|
| 628 | os.close(tocfno) |
|---|
| 629 | |
|---|
| 630 | self.logdebug("Exiting streams polling loop...") |
|---|
| 631 | |
|---|
| 632 | self.logdebug("input data's final length : %s" % len(indata)) |
|---|
| 633 | self.logdebug("back-channel data's final length : %s" % len(outdata)) |
|---|
| 634 | |
|---|
| 635 | self.logdebug("Total bytes read from CUPS (job's datas) : %s" % totalfromcups) |
|---|
| 636 | self.logdebug("Total bytes sent to real backend (job's datas) : %s" % totaltochild) |
|---|
| 637 | |
|---|
| 638 | self.logdebug("Total bytes read from real backend (back-channel datas) : %s" % totalfromchild) |
|---|
| 639 | self.logdebug("Total bytes sent back to CUPS (back-channel datas) : %s" % totaltocups) |
|---|
| 640 | |
|---|
| 641 | # Check exit code of original CUPS backend. |
|---|
| 642 | if status == -1 : |
|---|
| 643 | # we exited the loop before the real backend exited |
|---|
| 644 | # now we have to wait for it to finish and get its status |
|---|
| 645 | self.logdebug("Waiting for real backend to exit...") |
|---|
| 646 | try : |
|---|
| 647 | status = subprocess.wait() |
|---|
| 648 | except OSError : # already dead : TODO : detect when abnormal |
|---|
| 649 | status = 0 |
|---|
| 650 | if os.WIFEXITED(status) : |
|---|
| 651 | retcode = os.WEXITSTATUS(status) |
|---|
| 652 | elif not killed : |
|---|
| 653 | self.sendBackChannelData(_("CUPS backend %s died abnormally.") % realbackend, "error") |
|---|
| 654 | retcode = -1 |
|---|
| 655 | else : |
|---|
| 656 | retcode = self.removeJob() |
|---|
| 657 | |
|---|
| 658 | self.dropPriv() |
|---|
| 659 | |
|---|
| 660 | return retcode |
|---|
| 661 | |
|---|
| 662 | if __name__ == "__main__" : |
|---|
| 663 | # This is a CUPS backend, we should act and die like a CUPS backend |
|---|
| 664 | retcode = 0 |
|---|
| 665 | if len(sys.argv) == 1 : |
|---|
| 666 | (directory, myname) = os.path.split(sys.argv[0]) |
|---|
| 667 | tmpdir = tempfile.gettempdir() |
|---|
| 668 | lockfilename = os.path.join(tmpdir, "%s..LCK" % myname) |
|---|
| 669 | if os.path.exists(lockfilename) : |
|---|
| 670 | # there's already a lockfile, see if still used |
|---|
| 671 | lockfile = open(lockfilename, "r") |
|---|
| 672 | pid = int(lockfile.read()) |
|---|
| 673 | lockfile.close() |
|---|
| 674 | try : |
|---|
| 675 | # see if the pid contained in the lock file is still running |
|---|
| 676 | os.kill(pid, 0) |
|---|
| 677 | except OSError, e : |
|---|
| 678 | if e.errno != errno.EPERM : |
|---|
| 679 | # process doesn't exist anymore, remove the lock |
|---|
| 680 | os.remove(lockfilename) |
|---|
| 681 | |
|---|
| 682 | if not os.path.exists(lockfilename) : |
|---|
| 683 | lockfile = open(lockfilename, "w") |
|---|
| 684 | lockfile.write("%i" % os.getpid()) |
|---|
| 685 | lockfile.close() |
|---|
| 686 | # we will execute each existing backend in device enumeration mode |
|---|
| 687 | # and generate their PyKota accounting counterpart |
|---|
| 688 | allbackends = [ os.path.join(directory, b) \ |
|---|
| 689 | for b in os.listdir(directory) |
|---|
| 690 | if os.access(os.path.join(directory, b), os.X_OK) \ |
|---|
| 691 | and (b != myname)] |
|---|
| 692 | for backend in allbackends : |
|---|
| 693 | answer = os.popen(backend, "r") |
|---|
| 694 | try : |
|---|
| 695 | devices = [line.strip() for line in answer.readlines()] |
|---|
| 696 | except : |
|---|
| 697 | devices = [] |
|---|
| 698 | status = answer.close() |
|---|
| 699 | if status is None : |
|---|
| 700 | for d in devices : |
|---|
| 701 | # each line is of the form : 'xxxx xxxx "xxxx xxx" "xxxx xxx"' |
|---|
| 702 | # so we have to decompose it carefully |
|---|
| 703 | fdevice = cStringIO.StringIO("%s" % d) |
|---|
| 704 | tokenizer = shlex.shlex(fdevice) |
|---|
| 705 | tokenizer.wordchars = tokenizer.wordchars + r".:,?!~/\_$*-+={}[]()#" |
|---|
| 706 | arguments = [] |
|---|
| 707 | while 1 : |
|---|
| 708 | token = tokenizer.get_token() |
|---|
| 709 | if token : |
|---|
| 710 | arguments.append(token) |
|---|
| 711 | else : |
|---|
| 712 | break |
|---|
| 713 | fdevice.close() |
|---|
| 714 | try : |
|---|
| 715 | (devicetype, device, name, fullname) = arguments |
|---|
| 716 | except ValueError : |
|---|
| 717 | pass # ignore this 'bizarre' device |
|---|
| 718 | else : |
|---|
| 719 | if name.startswith('"') and name.endswith('"') : |
|---|
| 720 | name = name[1:-1] |
|---|
| 721 | if fullname.startswith('"') and fullname.endswith('"') : |
|---|
| 722 | fullname = fullname[1:-1] |
|---|
| 723 | print '%s cupspykota:%s "PyKota+%s" "PyKota managed %s"' % (devicetype, device, name, fullname) |
|---|
| 724 | os.remove(lockfilename) |
|---|
| 725 | retcode = 0 |
|---|
| 726 | elif len(sys.argv) not in (6, 7) : |
|---|
| 727 | sys.stderr.write("ERROR: %s job-id user title copies options [file]\n" % sys.argv[0]) |
|---|
| 728 | retcode = 1 |
|---|
| 729 | else : |
|---|
| 730 | try : |
|---|
| 731 | # Initializes the backend |
|---|
| 732 | kotabackend = PyKotaBackend() |
|---|
| 733 | kotabackend.deferredInit() |
|---|
| 734 | retcode = kotabackend.mainWork() |
|---|
| 735 | kotabackend.storage.close() |
|---|
| 736 | kotabackend.closeJobDataStream() |
|---|
| 737 | except SystemExit : |
|---|
| 738 | retcode = -1 |
|---|
| 739 | except : |
|---|
| 740 | try : |
|---|
| 741 | kotabackend.crashed("cupspykota backend failed") |
|---|
| 742 | except : |
|---|
| 743 | crashed("cupspykota backend failed") |
|---|
| 744 | retcode = 1 |
|---|
| 745 | |
|---|
| 746 | sys.exit(retcode) |
|---|
