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#!/usr/bin/python |
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# |
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# lpr-agent - keep a password in memory and use it to print stuff |
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# Copyright (C) 2000 Teddy Hogeborn |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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# Author: Teddy Hogeborn <teddy@fukt.bth.se> |
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# Folkparksv. 22 |
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# 372 38 Ronneby |
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# SWEDEN |
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|
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import os, errno, tempfile, sys, getopt, SocketServer, rfc822, string |
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from socket import * |
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from signal import * |
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|
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# Parse the command line options and set the "c_flag" accordingly |
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optlist, args = getopt.getopt(sys.argv[1:], 'bck', ['sh', 'bourne-shell',\ |
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'csh', 'c-shell',\ |
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'debug', 'kill', \ |
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'version', 'help']) |
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|
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if ('--version', '') in optlist: |
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print """lpr-agent (lpr-agent) 1.0 |
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Copyright (C) 2000 Teddy Hogeborn |
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lpr-agent comes with ABSOLUTELY NO WARRANTY. |
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You may redistribute copies of lpr-agent under the terms of the GNU |
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General Public License. For more information about these matters, see |
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the file named COPYING.""" |
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sys.exit(0) |
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|
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if ('--help', '') in optlist: |
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print """lpr-agent prints some shell commands to be evaluated and also forks |
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off and stays in memory, receiving commands and data on a Unix file |
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system socket. It can then be accessed with the program "lpr-client". |
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|
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Usage: lpr-agent [options] |
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|
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Examples of common usage: |
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Start a server and evaluate commands |
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eval `lpr-agent` |
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Start a server and evaluate commands suitable for C-shells |
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eval `lpr-agent --c-shell` |
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Kill the agent (when logging out or when not printing anymore): |
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lpr-agent --kill |
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|
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Normal options: |
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-k, --kill kill the agent |
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-b, --sh, --bourne-shell print commands suitable for |
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bourne shells |
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-c, --csh, --c-shell print commands suitable for |
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c-shells |
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--version show version number |
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--help show this help |
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|
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Obscure or debugging options: |
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--debug do not close stdout and stderr, |
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show debugging information on |
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stdout and lets any Python |
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errors show up on stderr |
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|
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Report bugs to <teddy@fukt.bth.se>. |
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""" |
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sys.exit(0) |
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|
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debug_flag = ('--debug', '') in optlist |
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|
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c_flag = (('-c', '') in optlist) or (('--csh', '') in optlist)\ |
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or (('--c-shell', '') in optlist) |
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|
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if (('-k', '') in optlist or ('--kill', '') in optlist): |
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if os.environ.has_key('LPR_AGENT_PID'): |
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try: |
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os.kill(string.atoi(os.environ['LPR_AGENT_PID']), SIGTERM) |
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except os.error, the_error: |
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if the_error[0] != errno.ESRCH: |
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raise os.error, the_error |
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else: |
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print "The agent is not running." |
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sys.exit(1) |
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else: |
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print "No agent is running." |
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sys.exit(1) |
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sys.exit(0) |
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|
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# Make up a name for the directory. |
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if os.environ.has_key('TMPDIR'): |
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tempfile.template=os.environ['TMPDIR'] |
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else: |
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tempfile.tempdir="/tmp" |
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tempfile.template="lpr-" + `os.getpid()` + "-" |
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socket_dir=tempfile.mktemp() |
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|
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# Try to create the directory, but don't fail if it already exists. |
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try: |
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os.mkdir(socket_dir, 0700) |
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except os.error, the_error: |
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if the_error[0] != errno.EEXIST: |
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raise os.error, the_error |
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else: |
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# If the directory alread exists we should be able to change |
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# the permissions on it. If we can't, the directory is owned |
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# by someone else who is trying to fool us into using it. |
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os.chmod(socket_dir, 0700) |
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|
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# Make up a name for the file/socket. |
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tempfile.tempdir=socket_dir |
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tempfile.template="agent." + `os.getpid()` + "-" |
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socket_name=tempfile.mktemp() |
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|
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def cleanup_socket(): |
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"Close socket, remove file and directory; called on exit." |
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try: |
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sock.shutdown(2) |
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except os.error, the_error: |
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pass |
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try: |
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os.remove(socket_name) |
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except os.error, the_error: |
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pass |
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try: |
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os.rmdir(socket_dir) |
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except os.error, the_error: |
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pass |
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|
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# Try to create an unnamed socket. If we fail we call the cleanup |
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# function to remove the directory and then call the default error |
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# handler, which should abort. (The file/socket hasn't been created |
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# yet.) |
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try: |
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sock = socket(AF_UNIX, SOCK_STREAM) |
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except os.error, the_error: |
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cleanup_socket() |
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raise os.error, the_error |
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|
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# Fork off a child daemon process; In the parent, just print some |
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# commands to be eval'ed by a shell and then exit. |
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pid=os.fork() |
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if pid != 0: |
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if c_flag: |
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print "setenv LPR_AUTH_SOCK " + socket_name + ";" |
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print "setenv LPR_AGENT_PID " + `pid` + ";" |
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print "echo Agent pid " + `pid` + ";" |
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else: |
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print "LPR_AUTH_SOCK=" + socket_name + "; export LPR_AUTH_SOCK;" |
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print "LPR_AGENT_PID=" + `pid` + "; export LPR_AGENT_PID;" |
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print "echo Agent pid " + `pid` + ";" |
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sys.exit(0) |
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|
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# We want to become a daemon now. |
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|
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# Close all standard open file descriptors |
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#sys.stdin.close() |
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null=os.open("/dev/null", os.O_NOCTTY | os.O_RDONLY) |
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os.dup2(null, sys.stdin.fileno()) |
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os.close(null) |
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if not debug_flag: |
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# sys.stdout.close() |
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# sys.stderr.close() |
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null=os.open("/dev/null", os.O_NOCTTY | os.O_WRONLY) |
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os.dup2(null, sys.stdout.fileno()) |
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os.dup2(null, sys.stderr.fileno()) |
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os.close(null) |
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|
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# Create a new process group for this process |
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os.setsid() |
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|
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# On exit remove the socket and the directory |
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sys.exitfunc=cleanup_socket |
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|
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signal(SIGINT, SIG_IGN) |
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|
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signal(SIGHUP, lambda signum, frame: sys.exit(0)) |
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signal(SIGTERM, lambda signum, frame: sys.exit(0)) |
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|
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# OK, we're a real daemon now. |
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|
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BUFSIZE=8192 |
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|
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def stripcrnl(string): |
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"Return STRING with any CR or NL stripped off the end." |
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result = "" |
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if string[-1:] == '\n' or string[-1:] == '\r': |
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result = string[:-1] |
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if result[-1:] == '\n' or result[-1:] == '\r': |
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return result[:-1] |
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else: |
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return result |
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|
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# Inherit a handler class to handle every connection. |
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class connectionhandler(SocketServer.BaseRequestHandler): |
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def handle(self): |
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if debug_flag: |
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print sys.argv[0] + ": server handling connection" |
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clientdata = os.fdopen(self.request.fileno(), "rb") |
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# Read first line; it has the command on it. |
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command = clientdata.readline() |
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command = stripcrnl(command) |
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if debug_flag: |
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print sys.argv[0] + ": ServerCommand: " + command |
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# Read headers, if any. |
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message = rfc822.Message(clientdata, 0) |
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if debug_flag: |
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print sys.argv[0] + ": Server EOH" |
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# Do stuff depending on command. |
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if command == "debug": |
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# Debug command, just print all the input to stdout. |
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# This is only of any use if the agent is running with |
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# --debug, i.e., has not closed stdout. |
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if debug_flag: |
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print sys.argv[0] + ": Server command: debug" |
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if debug_flag: |
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# print "password: " + agent.password |
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while 1: |
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data = clientdata.read(BUFSIZE) |
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if not data: break |
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if debug_flag: |
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sys.stdout.write(data) |
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elif command == "print": |
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# Print command, pipe the input to smbclient. |
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if debug_flag: |
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print sys.argv[0] + ": server command: print" |
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smbclientformat = "smbclient \"%s\" \"%s\" -N -P %s %s -c \"%s\"" |
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# service, passwd, ip, options, command |
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smbserver = "slade" |
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smbprinter = "rby_expen" |
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smbservice = None |
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smbserverip = "-I slade.student.bth.se" |
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smbclientoptions = "" |
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smbclientcommand = "printmode graphics;print -" |
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if message.getheader('SmbClientFormat'): |
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smbclientformat = message.getheader('SmbClientFormat') |
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if message.getheader('SmbServer'): |
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smbserverip = "" |
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smbserver = message.getheader('SmbServer') |
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if message.getheader('SmbPrinter'): |
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smbprinter = message.getheader('SmbPrinter') |
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if message.getheader('SmbService'): |
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smbserver = None |
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smbprinter = None |
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smbclientip = "" |
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smbservice = message.getheader('SmbService') |
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if message.getheader('SmbServerIP'): |
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smbserverip = "-I \"" \ |
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+ message.getheader('SmbServerIP')\ |
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+ "\"" |
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if message.getheader('SmbClientOptions'): |
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smbclientoptions = message.getheader('SmbClientOptions') |
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if message.getheader('SmbClientCommand'): |
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smbclientcommand = message.getheader('SmbClientCommand') |
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# If it wasn't explicitly set, set the service from the |
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# components, default or otherwise. |
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if not smbservice: |
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smbservice = "//%s/%s" % (smbserver, smbprinter) |
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pipecmd = smbclientformat % (smbservice,\ |
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agent.password, \ |
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smbserverip, \ |
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smbclientoptions, \ |
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smbclientcommand) |
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pipe = None |
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pipe = os.popen(pipecmd, "w") |
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if debug_flag: |
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print sys.argv[0] + ": Pipecmd: " + pipecmd |
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while 1: |
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data = clientdata.read(BUFSIZE) |
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if not data: break |
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if debug_flag: |
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sys.stdout.write(data) |
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else: |
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pipe.write(data) |
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#if not debug_flag: |
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pipe.close() |
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elif command == "write": |
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# Write command, write input to file specified in header. |
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# Used for testing. |
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if debug_flag: |
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print sys.argv[0] + ": server command: write" |
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outfile = open(message.getheader('Filename'), "wb") |
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while 1: |
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data = clientdata.read(BUFSIZE) |
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if not data: break |
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outfile.write(data) |
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outfile.close() |
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elif command == "password": |
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# Set password variable. |
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if debug_flag: |
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print sys.argv[0] + ": server command: password" |
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password = clientdata.readline(80) |
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agent.password = stripcrnl(password) |
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del password |
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elif command == "eval": |
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# Eval all input. May be used for extension and |
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# modification of already running agents. |
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if debug_flag: |
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print sys.argv[0] + ": server command: eval" |
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while 1: |
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line = clientdata.readline() |
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if not line: break |
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eval(line) |
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elif command == "quit": |
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clientdata.close() |
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self.request.close() |
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cleanup_socket() |
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os._exit(0) |
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else: |
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if debug_flag: |
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print sys.argv[0] + ": Unknown command '" + command + "'" |
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clientdata.close() |
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self.request.close() |
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|
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## Inherit a server agent class. |
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# class LPRAgent(ForkingMixIn, SocketServer.UnixStreamServer): pass |
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class LPRAgent(SocketServer.UnixStreamServer): |
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password = "" |
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|
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# Instantiate an agent to listen on the socket and call the handler. |
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agent = LPRAgent(socket_name, connectionhandler) |
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|
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if debug_flag: |
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print sys.argv[0] + ": Server starting..." |
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|
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# Go go go! |
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agent.serve_forever() |
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