| 1 | #! /usr/bin/env python |
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| 2 | # -*- coding: ISO-8859-15 -*- |
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| 3 | |
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| 4 | # A notifier for PyKota |
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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, 2006, 2007 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 socket |
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| 29 | import errno |
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| 30 | import signal |
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| 31 | import xmlrpclib |
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| 32 | |
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| 33 | try : |
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| 34 | import PAM |
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| 35 | except ImportError : |
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| 36 | hasPAM = 0 |
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| 37 | else : |
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| 38 | hasPAM = 1 |
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| 39 | |
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| 40 | from pykota.tool import Tool, PyKotaToolError, PyKotaCommandLineError, crashed, N_ |
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| 41 | |
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| 42 | __doc__ = N_("""pknotify v%(__version__)s (c) %(__years__)s %(__author__)s |
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| 43 | |
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| 44 | Notifies or ask questions to end users who launched the PyKotIcon application. |
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| 45 | |
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| 46 | command line usage : |
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| 47 | |
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| 48 | pknotify [options] [arguments] |
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| 49 | |
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| 50 | options : |
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| 51 | |
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| 52 | -v | --version Prints pknotify's version number then exits. |
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| 53 | -h | --help Prints this message then exits. |
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| 54 | |
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| 55 | -d | --destination h[:p] Sets the destination hostname and optional |
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| 56 | port onto which contact the remote PyKotIcon |
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| 57 | application. This option is mandatory. |
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| 58 | When not specified, the port defaults to 7654. |
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| 59 | |
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| 60 | -a | --ask Tells pknotify to ask something to the end |
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| 61 | user. Then pknotify will output the result. |
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| 62 | |
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| 63 | -C | --checkauth When --ask is used and both an 'username' and a |
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| 64 | 'password' are asked to the end user, then |
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| 65 | pknotify will try to authenticate the user |
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| 66 | through PAM. If authentified, this program |
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| 67 | will print "AUTH=YES", else "AUTH=NO". |
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| 68 | If a field is missing, "AUTH=IMPOSSIBLE" will |
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| 69 | be printed. If the user is authenticated, then |
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| 70 | "USERNAME=xxxx" will be printed as well. |
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| 71 | |
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| 72 | -c | --confirm Tells pknotify to ask for either a confirmation |
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| 73 | or abortion. |
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| 74 | |
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| 75 | -D | --denyafter N With --checkauth above, makes pknotify loop |
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| 76 | up to N times if the password is incorrect. |
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| 77 | After having reached the limit, "DENY" will |
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| 78 | be printed, which effectively rejects the job. |
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| 79 | The default value of N is 1, meaning the job |
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| 80 | is denied after the first unsuccessful try. |
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| 81 | |
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| 82 | -N | --noremote action If it's impossible to connect to the remote |
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| 83 | PyKotIcon machine, do this action instead. |
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| 84 | Allowed actions are 'CONTINUE' and 'CANCEL', |
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| 85 | which will respectively allow the processing |
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| 86 | of the print job to continue, or the job to |
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| 87 | be cancelled. The default value is CANCEL. |
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| 88 | |
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| 89 | -n | --notify Tells pknotify to send an informational message |
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| 90 | to the end user. |
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| 91 | |
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| 92 | -q | --quit Tells pknotify to send a message asking the |
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| 93 | PyKotIcon application to exit. This option can |
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| 94 | be combined with the other ones to make PyKotIcon |
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| 95 | exit after having sent the answer from the dialog. |
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| 96 | |
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| 97 | -t | --timeout T Tells pknotify to ignore the end user's answer if |
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| 98 | it comes past T seconds after the dialog box being |
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| 99 | opened. The default value is 0 seconds, which |
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| 100 | tells pknotify to wait indefinitely. |
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| 101 | Use this option to avoid having an user who |
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| 102 | leaved his computer stall a whole print queue. |
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| 103 | |
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| 104 | You MUST specify either --ask, --confirm, --notify or --quit. |
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| 105 | |
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| 106 | arguments : |
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| 107 | |
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| 108 | -a | --ask : Several arguments are accepted, of the form |
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| 109 | "label:varname:defaultvalue". The result will |
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| 110 | be printed to stdout in the following format : |
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| 111 | VAR1NAME=VAR1VALUE |
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| 112 | VAR2NAME=VAR2VALUE |
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| 113 | ... |
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| 114 | If the dialog was cancelled, nothing will be |
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| 115 | printed. If one of the varname is 'password' |
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| 116 | then this field is asked as a password (you won't |
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| 117 | see what you type in), and is NOT printed. Although |
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| 118 | it is not printed, it will be used to check if |
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| 119 | authentication is valid if you specify --checkauth. |
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| 120 | |
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| 121 | -c | --confirm : A single argument is expected, representing the |
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| 122 | message to display. If the dialog is confirmed |
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| 123 | then pknotify will print OK, else CANCEL. |
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| 124 | |
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| 125 | -n | --notify : A single argument is expected, representing the |
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| 126 | message to display. In this case pknotify will |
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| 127 | always print OK. |
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| 128 | |
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| 129 | examples : |
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| 130 | |
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| 131 | pknotify -d client:7654 --noremote CONTINUE --confirm "This job costs 10 credits" |
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| 132 | |
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| 133 | Would display the cost of the print job and asks for confirmation. |
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| 134 | If the end user doesn't have PyKotIcon running and accepting connections |
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| 135 | from the print server, PyKota will consider that the end user accepted |
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| 136 | to print this job. |
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| 137 | |
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| 138 | pknotify --destination $PYKOTAJOBORIGINATINGHOSTNAME:7654 \\ |
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| 139 | --checkauth --ask "Your name:username:" "Your password:password:" |
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| 140 | |
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| 141 | Asks an username and password, and checks if they are valid. |
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| 142 | NB : The PYKOTAJOBORIGINATINGHOSTNAME environment variable is |
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| 143 | only set if you launch pknotify from cupspykota through a directive |
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| 144 | in ~pykota/pykota.conf |
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| 145 | |
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| 146 | The TCP port you'll use must be reachable on the client from the |
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| 147 | print server. |
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| 148 | """) |
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| 149 | |
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| 150 | class TimeoutError(Exception) : |
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| 151 | """An exception for timeouts.""" |
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| 152 | def __init__(self, message = ""): |
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| 153 | self.message = message |
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| 154 | Exception.__init__(self, message) |
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| 155 | def __repr__(self): |
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| 156 | return self.message |
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| 157 | __str__ = __repr__ |
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| 158 | |
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| 159 | class PyKotaNotify(Tool) : |
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| 160 | """A class for pknotify.""" |
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| 161 | def sanitizeMessage(self, msg) : |
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| 162 | """Replaces \\n and returns a messagee in xmlrpclib Binary format.""" |
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| 163 | return xmlrpclib.Binary(self.userCharsetToUTF8(msg.replace("\\n", "\n"))) |
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| 164 | |
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| 165 | def convPAM(self, auth, queries=[], userdata=None) : |
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| 166 | """Prepares PAM datas.""" |
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| 167 | response = [] |
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| 168 | for (query, qtype) in queries : |
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| 169 | if qtype == PAM.PAM_PROMPT_ECHO_OFF : |
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| 170 | response.append((self.password, 0)) |
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| 171 | elif qtype in (PAM.PAM_PROMPT_ECHO_ON, PAM.PAM_ERROR_MSG, PAM.PAM_TEXT_INFO) : |
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| 172 | self.printInfo("Unexpected PAM query : %s (%s)" % (query, qtype), "warn") |
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| 173 | response.append(('', 0)) |
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| 174 | else: |
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| 175 | return None |
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| 176 | return response |
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| 177 | |
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| 178 | def checkAuth(self, username, password) : |
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| 179 | """Checks if we could authenticate an username with a password.""" |
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| 180 | if not hasPAM : |
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| 181 | raise PyKotaToolError, _("You MUST install PyPAM for this functionnality to work !") |
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| 182 | else : |
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| 183 | retcode = False |
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| 184 | self.password = password |
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| 185 | self.regainPriv() |
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| 186 | auth = PAM.pam() |
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| 187 | auth.start("passwd") |
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| 188 | auth.set_item(PAM.PAM_USER, username) |
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| 189 | auth.set_item(PAM.PAM_CONV, self.convPAM) |
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| 190 | try : |
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| 191 | auth.authenticate() |
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| 192 | auth.acct_mgmt() |
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| 193 | except PAM.error, resp : |
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| 194 | self.printInfo(_("Authentication error for user %s : %s") % (username, resp), "warn") |
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| 195 | except : |
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| 196 | self.printInfo(_("Internal error : can't authenticate user %s") % username, "error") |
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| 197 | else : |
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| 198 | self.logdebug(_("Password correct for user %s") % username) |
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| 199 | retcode = True |
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| 200 | self.dropPriv() |
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| 201 | return retcode |
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| 202 | |
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| 203 | def alarmHandler(self, signum, frame) : |
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| 204 | """Alarm handler.""" |
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| 205 | raise TimeoutError, _("The end user at %s:%i didn't answer within %i seconds. The print job will be cancelled.") % (self.destination, self.port, self.timeout) |
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| 206 | |
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| 207 | def main(self, arguments, options) : |
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| 208 | """Notifies or asks questions to end users through PyKotIcon.""" |
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| 209 | try : |
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| 210 | (self.destination, self.port) = options["destination"].split(":") |
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| 211 | self.port = int(self.port) |
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| 212 | except ValueError : |
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| 213 | self.destination = options["destination"] |
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| 214 | self.port = 7654 |
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| 215 | |
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| 216 | try : |
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| 217 | denyafter = int(options["denyafter"]) |
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| 218 | if denyafter < 1 : |
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| 219 | raise ValueError |
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| 220 | except (ValueError, TypeError) : |
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| 221 | denyafter = 1 |
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| 222 | |
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| 223 | try : |
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| 224 | self.timeout = int(options["timeout"]) |
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| 225 | if self.timeout < 0 : |
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| 226 | raise ValueError |
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| 227 | except (ValueError, TypeError) : |
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| 228 | self.timeout = 0 |
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| 229 | |
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| 230 | if self.timeout : |
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| 231 | signal.signal(signal.SIGALRM, self.alarmHandler) |
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| 232 | signal.alarm(self.timeout) |
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| 233 | |
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| 234 | try : |
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| 235 | server = xmlrpclib.ServerProxy("http://%s:%s" % (self.destination, self.port)) |
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| 236 | if options["ask"] : |
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| 237 | try : |
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| 238 | denyafter = int(options["denyafter"]) |
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| 239 | if denyafter < 1 : |
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| 240 | raise ValueError |
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| 241 | except (ValueError, TypeError) : |
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| 242 | denyafter = 1 |
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| 243 | labels = [] |
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| 244 | varnames = [] |
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| 245 | varvalues = {} |
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| 246 | for arg in arguments : |
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| 247 | try : |
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| 248 | (label, varname, varvalue) = arg.split(":", 2) |
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| 249 | except ValueError : |
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| 250 | raise PyKotaCommandLineError, "argument '%s' is invalid !" % arg |
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| 251 | labels.append(self.sanitizeMessage(label)) |
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| 252 | varname = varname.lower() |
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| 253 | varnames.append(varname) |
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| 254 | varvalues[varname] = self.sanitizeMessage(varvalue) |
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| 255 | |
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| 256 | passnumber = 1 |
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| 257 | authok = None |
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| 258 | while (authok != "AUTH=YES") and (passnumber <= denyafter) : |
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| 259 | result = server.askDatas(labels, varnames, varvalues) |
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| 260 | if not options["checkauth"] : |
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| 261 | break |
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| 262 | if result["isValid"] : |
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| 263 | if ("username" in varnames) and ("password" in varnames) : |
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| 264 | if self.checkAuth(self.UTF8ToUserCharset(result["username"].data[:]), |
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| 265 | self.UTF8ToUserCharset(result["password"].data[:])) : |
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| 266 | authok = "AUTH=YES" |
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| 267 | else : |
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| 268 | authok = "AUTH=NO" |
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| 269 | else : |
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| 270 | authok = "AUTH=IMPOSSIBLE" |
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| 271 | passnumber += 1 |
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| 272 | |
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| 273 | if options["checkauth"] and options["denyafter"] \ |
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| 274 | and (passnumber > denyafter) \ |
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| 275 | and (authok != "AUTH=YES") : |
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| 276 | print "DENY" |
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| 277 | if result["isValid"] : |
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| 278 | for varname in varnames : |
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| 279 | if (varname != "password") \ |
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| 280 | and ((varname != "username") or (authok in (None, "AUTH=YES"))) : |
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| 281 | print "%s=%s" % (varname.upper(), self.UTF8ToUserCharset(result[varname].data[:])) |
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| 282 | if authok is not None : |
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| 283 | print authok |
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| 284 | elif options["confirm"] : |
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| 285 | print server.showDialog(self.sanitizeMessage(arguments[0]), True) |
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| 286 | elif options["notify"] : |
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| 287 | print server.showDialog(self.sanitizeMessage(arguments[0]), False) |
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| 288 | |
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| 289 | if options["quit"] : |
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| 290 | server.quitApplication() |
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| 291 | except (socket.error, socket.gaierror), msg : |
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| 292 | print options["noremote"] |
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| 293 | try : |
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| 294 | errnum = msg.args[0] |
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| 295 | except (AttributeError, IndexError) : |
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| 296 | pass |
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| 297 | else : |
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| 298 | if errnum == errno.ECONNREFUSED : |
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| 299 | raise PyKotaToolError, "%s : %s" % (str(msg), (_("Are you sure that PyKotIcon is running and accepting incoming connections on %s:%s ?") % (self.destination, self.port))) |
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| 300 | self.printInfo("%s : %s" % (_("Connection error"), str(msg)), "warn") |
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| 301 | except TimeoutError, msg : |
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| 302 | self.printInfo(msg, "warn") |
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| 303 | print "CANCEL" # Timeout occured : job is cancelled. |
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| 304 | |
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| 305 | if self.timeout : |
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| 306 | signal.alarm(0) |
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| 307 | |
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| 308 | if __name__ == "__main__" : |
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| 309 | retcode = 0 |
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| 310 | try : |
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| 311 | defaults = { \ |
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| 312 | "timeout" : 0, |
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| 313 | "noremote" : "CANCEL", |
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| 314 | } |
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| 315 | short_options = "vhd:acnqCD:t:N:" |
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| 316 | long_options = ["help", "version", "destination=", "denyafter=", \ |
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| 317 | "timeout=", "ask", "checkauth", "confirm", "notify", \ |
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| 318 | "quit", "noremote=" ] |
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| 319 | |
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| 320 | # Initializes the command line tool |
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| 321 | notifier = PyKotaNotify(doc=__doc__) |
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| 322 | notifier.deferredInit() |
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| 323 | |
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| 324 | # parse and checks the command line |
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| 325 | (options, args) = notifier.parseCommandline(sys.argv[1:], short_options, long_options) |
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| 326 | |
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| 327 | # sets long options |
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| 328 | options["help"] = options["h"] or options["help"] |
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| 329 | options["version"] = options["v"] or options["version"] |
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| 330 | options["destination"] = options["d"] or options["destination"] |
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| 331 | options["ask"] = options["a"] or options["ask"] |
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| 332 | options["confirm"] = options["c"] or options["confirm"] |
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| 333 | options["notify"] = options["n"] or options["notify"] |
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| 334 | options["quit"] = options["q"] or options["quit"] |
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| 335 | options["checkauth"] = options["C"] or options["checkauth"] |
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| 336 | options["denyafter"] = options["D"] or options["denyafter"] |
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| 337 | options["timeout"] = options["t"] or options["timeout"] or defaults["timeout"] |
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| 338 | options["noremote"] = (options["N"] or options["noremote"] or defaults["noremote"]).upper() |
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| 339 | |
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| 340 | if options["help"] : |
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| 341 | notifier.display_usage_and_quit() |
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| 342 | elif options["version"] : |
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| 343 | notifier.display_version_and_quit() |
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| 344 | elif (options["ask"] and (options["confirm"] or options["notify"])) \ |
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| 345 | or (options["confirm"] and (options["ask"] or options["notify"])) \ |
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| 346 | or ((options["checkauth"] or options["denyafter"]) and not options["ask"]) \ |
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| 347 | or (options["notify"] and (options["ask"] or options["confirm"])) : |
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| 348 | raise PyKotaCommandLineError, _("incompatible options, see help.") |
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| 349 | elif (not options["destination"]) \ |
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| 350 | or not (options["quit"] or options["ask"] or options["confirm"] or options["notify"]) : |
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| 351 | raise PyKotaCommandLineError, _("some options are mandatory, see help.") |
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| 352 | elif options["noremote"] not in ("CANCEL", "CONTINUE") : |
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| 353 | raise PyKotaCommandLineError, _("incorrect value for the --noremote command line switch, see help.") |
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| 354 | elif (not args) and (not options["quit"]) : |
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| 355 | raise PyKotaCommandLineError, _("some options require arguments, see help.") |
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| 356 | else : |
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| 357 | retcode = notifier.main(args, options) |
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| 358 | except KeyboardInterrupt : |
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| 359 | sys.stderr.write("\nInterrupted with Ctrl+C !\n") |
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| 360 | retcode = -3 |
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| 361 | except PyKotaCommandLineError, msg : |
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| 362 | sys.stderr.write("%s : %s\n" % (sys.argv[0], msg)) |
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| 363 | print "CANCEL" # Forces the cancellation of the print job if a command line switch is incorrect |
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| 364 | retcode = -2 |
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| 365 | except SystemExit : |
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| 366 | pass |
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| 367 | except : |
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| 368 | try : |
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| 369 | notifier.crashed("%s failed" % sys.argv[0]) |
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| 370 | except : |
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| 371 | crashed("%s failed" % sys.argv[0]) |
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| 372 | retcode = -1 |
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| 373 | |
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| 374 | sys.exit(retcode) |
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