1 | #! /usr/bin/env python |
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2 | # -*- coding: ISO-8859-15 -*- |
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3 | |
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4 | # An email gateway 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 os |
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29 | import popen2 |
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30 | import smtplib |
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31 | import email |
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32 | from email.MIMEText import MIMEText |
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33 | from email.Header import Header |
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34 | import email.Utils |
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35 | |
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36 | from pykota.tool import PyKotaTool, PyKotaCommandLineError, crashed, N_ |
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37 | |
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38 | __doc__ = N_("""pkmail v%(__version__)s (c) %(__years__)s %(__author__)s |
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39 | |
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40 | Email gateway for PyKota. |
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41 | |
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42 | command line usage : |
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43 | |
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44 | pkmail [options] |
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45 | |
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46 | options : |
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47 | |
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48 | -v | --version Prints pkmail's version number then exits. |
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49 | -h | --help Prints this message then exits. |
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50 | |
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51 | |
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52 | This command is meant to be used from your mail server's aliases file, |
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53 | as a pipe. It will then accept commands send to it in email messages, |
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54 | and will send the answer to the command's originator. |
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55 | |
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56 | To use this command, create an email alias in /etc/aliases with |
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57 | the following format : |
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58 | |
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59 | pykotacmd: "|/usr/bin/pkmail" |
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60 | |
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61 | Then run the 'newaliases' command to regenerate the aliases database. |
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62 | |
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63 | You can now send commands by email to 'pykotacmd@yourdomain.com', with |
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64 | the command in the subject. |
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65 | |
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66 | List of supported commands : |
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67 | |
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68 | report [username] |
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69 | |
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70 | NB : For pkmail to work correctly, you may have to put the 'mail' |
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71 | system user in the 'pykota' system group to ensure this user can |
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72 | read the /etc/pykota/pykotadmin.conf file, and restart your |
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73 | mail server (e.g. /etc/init.d/exim restart). It is strongly advised |
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74 | that you think at least twice before doing this though. |
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75 | |
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76 | Use at your own risk ! |
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77 | """) |
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78 | |
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79 | |
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80 | class PKMail(PyKotaTool) : |
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81 | """A class for pkmail.""" |
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82 | def main(self, files, options) : |
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83 | """Accepts commands passed in an email message.""" |
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84 | data = sys.stdin.read() |
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85 | message = email.message_from_string(data) |
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86 | useremail = message["From"] |
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87 | whoami = message["To"] |
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88 | cmdargs = message["Subject"].split() |
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89 | try : |
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90 | (command, arguments) = (cmdargs[0].capitalize(), cmdargs[1:]) |
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91 | except IndexError : |
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92 | raise PyKotaCommandLineError, "No command found !" |
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93 | |
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94 | badchars = """/<>&"'#!%*$,;\\""" |
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95 | cheatmeonce = 0 |
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96 | for c in "".join(arguments) : |
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97 | if c in badchars : |
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98 | cheatmeonce = 1 |
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99 | |
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100 | if cheatmeonce : |
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101 | self.printInfo("Possible intruder at %s : %s" % (useremail, str(arguments)), "warn") |
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102 | result = "Either you mistyped your command, or you're a bad guy !" |
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103 | else : |
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104 | self.logdebug("Launching internal command '%s' with arguments %s" % (command, str(arguments))) |
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105 | cmdfunc = getattr(self, "cmd%s" % command, self.cmdDefault) |
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106 | result = cmdfunc(arguments) |
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107 | |
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108 | self.logdebug("Sending answer to : %s" % useremail) |
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109 | emailmsg = MIMEText(result, _charset=self.charset) |
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110 | emailmsg["Subject"] = Header(_("Result of your commands"), charset=self.charset) |
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111 | emailmsg["From"] = whoami |
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112 | emailmsg["To"] = useremail |
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113 | emailmsg["Date"] = email.Utils.formatdate(localtime=True) |
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114 | server = smtplib.SMTP(self.smtpserver) |
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115 | server.sendmail(whoami, [ useremail ], emailmsg.as_string()) |
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116 | server.quit() |
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117 | self.logdebug("Answer sent to : %s" % useremail) |
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118 | |
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119 | return 0 |
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120 | |
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121 | def runCommand(self, cmd) : |
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122 | """Executes a command.""" |
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123 | self.logdebug("Launching : '%s'" % cmd) |
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124 | os.environ["PATH"] = "%s:/bin:/usr/bin:/usr/local/bin:/opt/bin:/sbin:/usr/sbin" % os.environ.get("PATH", "") |
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125 | child = popen2.Popen3(cmd) |
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126 | child.tochild.close() |
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127 | result = child.fromchild.read() |
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128 | status = child.wait() |
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129 | if os.WIFEXITED(status) : |
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130 | status = os.WEXITSTATUS(status) |
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131 | self.logdebug("'%s' exited with status %s" % (cmd, status)) |
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132 | return result |
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133 | |
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134 | def cmdDefault(self, arguments) : |
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135 | """Default command : sends an 'unknown command' message.""" |
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136 | return "Unknown command." |
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137 | |
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138 | def cmdReport(self, args) : |
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139 | """Generates a print quota report.""" |
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140 | return self.runCommand("repykota %s" % ' '.join([ '"%s"' % a for a in args ])) |
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141 | |
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142 | if __name__ == "__main__" : |
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143 | retcode = 0 |
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144 | try : |
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145 | defaults = { \ |
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146 | } |
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147 | short_options = "vh" |
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148 | long_options = ["help", "version"] |
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149 | |
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150 | # Initializes the command line tool |
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151 | mailparser = PKMail(doc=__doc__) |
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152 | mailparser.deferredInit() |
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153 | |
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154 | # parse and checks the command line |
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155 | (options, args) = mailparser.parseCommandline(sys.argv[1:], short_options, long_options, allownothing=1) |
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156 | |
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157 | # sets long options |
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158 | options["help"] = options["h"] or options["help"] |
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159 | options["version"] = options["v"] or options["version"] |
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160 | |
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161 | if options["help"] : |
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162 | mailparser.display_usage_and_quit() |
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163 | elif options["version"] : |
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164 | mailparser.display_version_and_quit() |
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165 | else : |
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166 | retcode = mailparser.main(args, options) |
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167 | except KeyboardInterrupt : |
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168 | sys.stderr.write("\nInterrupted with Ctrl+C !\n") |
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169 | retcode = -3 |
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170 | except PyKotaCommandLineError, msg : |
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171 | sys.stderr.write("%s : %s\n" % (sys.argv[0], msg)) |
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172 | retcode = -2 |
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173 | except SystemExit : |
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174 | pass |
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175 | except : |
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176 | try : |
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177 | mailparser.crashed("pkmail failed") |
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178 | except : |
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179 | crashed("pkmail failed") |
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180 | retcode = -1 |
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181 | |
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182 | try : |
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183 | mailparser.storage.close() |
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184 | except (TypeError, NameError, AttributeError) : |
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185 | pass |
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186 | |
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187 | sys.exit(retcode) |
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