| 1 | #! /usr/bin/env python
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| 2 |
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| 3 | """A multi-threaded telnet-like server that gives a Python prompt.
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| 4 |
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| 5 | This is really a prototype for the same thing in C.
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| 6 |
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| 7 | Usage: pysvr.py [port]
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| 8 |
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| 9 | For security reasons, it only accepts requests from the current host.
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| 10 | This can still be insecure, but restricts violations from people who
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| 11 | can log in on your machine. Use with caution!
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| 12 |
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| 13 | """
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| 14 |
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| 15 | import sys, os, string, getopt, thread, socket, traceback
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| 16 |
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| 17 | PORT = 4000 # Default port
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| 18 |
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| 19 | def main():
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| 20 | try:
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| 21 | opts, args = getopt.getopt(sys.argv[1:], "")
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| 22 | if len(args) > 1:
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| 23 | raise getopt.error, "Too many arguments."
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| 24 | except getopt.error, msg:
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| 25 | usage(msg)
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| 26 | for o, a in opts:
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| 27 | pass
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| 28 | if args:
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| 29 | try:
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| 30 | port = string.atoi(args[0])
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| 31 | except ValueError, msg:
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| 32 | usage(msg)
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| 33 | else:
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| 34 | port = PORT
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| 35 | main_thread(port)
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| 36 |
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| 37 | def usage(msg=None):
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| 38 | sys.stdout = sys.stderr
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| 39 | if msg:
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| 40 | print msg
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| 41 | print "\n", __doc__,
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| 42 | sys.exit(2)
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| 43 |
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| 44 | def main_thread(port):
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| 45 | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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| 46 | sock.bind(("", port))
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| 47 | sock.listen(5)
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| 48 | print "Listening on port", port, "..."
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| 49 | while 1:
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| 50 | (conn, addr) = sock.accept()
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| 51 | if addr[0] != conn.getsockname()[0]:
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| 52 | conn.close()
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| 53 | print "Refusing connection from non-local host", addr[0], "."
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| 54 | continue
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| 55 | thread.start_new_thread(service_thread, (conn, addr))
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| 56 | del conn, addr
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| 57 |
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| 58 | def service_thread(conn, addr):
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| 59 | (caddr, cport) = addr
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| 60 | print "Thread %s has connection from %s.\n" % (str(thread.get_ident()),
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| 61 | caddr),
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| 62 | stdin = conn.makefile("r")
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| 63 | stdout = conn.makefile("w", 0)
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| 64 | run_interpreter(stdin, stdout)
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| 65 | print "Thread %s is done.\n" % str(thread.get_ident()),
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| 66 |
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| 67 | def run_interpreter(stdin, stdout):
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| 68 | globals = {}
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| 69 | try:
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| 70 | str(sys.ps1)
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| 71 | except:
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| 72 | sys.ps1 = ">>> "
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| 73 | source = ""
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| 74 | while 1:
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| 75 | stdout.write(sys.ps1)
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| 76 | line = stdin.readline()
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| 77 | if line[:2] == '\377\354':
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| 78 | line = ""
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| 79 | if not line and not source:
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| 80 | break
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| 81 | if line[-2:] == '\r\n':
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| 82 | line = line[:-2] + '\n'
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| 83 | source = source + line
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| 84 | try:
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| 85 | code = compile_command(source)
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| 86 | except SyntaxError, err:
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| 87 | source = ""
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| 88 | traceback.print_exception(SyntaxError, err, None, file=stdout)
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| 89 | continue
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| 90 | if not code:
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| 91 | continue
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| 92 | source = ""
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| 93 | try:
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| 94 | run_command(code, stdin, stdout, globals)
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| 95 | except SystemExit, how:
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| 96 | if how:
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| 97 | try:
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| 98 | how = str(how)
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| 99 | except:
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| 100 | how = ""
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| 101 | stdout.write("Exit %s\n" % how)
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| 102 | break
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| 103 | stdout.write("\nGoodbye.\n")
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| 104 |
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| 105 | def run_command(code, stdin, stdout, globals):
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| 106 | save = sys.stdin, sys.stdout, sys.stderr
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| 107 | try:
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| 108 | sys.stdout = sys.stderr = stdout
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| 109 | sys.stdin = stdin
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| 110 | try:
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| 111 | exec code in globals
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| 112 | except SystemExit, how:
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| 113 | raise SystemExit, how, sys.exc_info()[2]
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| 114 | except:
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| 115 | type, value, tb = sys.exc_info()
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| 116 | if tb: tb = tb.tb_next
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| 117 | traceback.print_exception(type, value, tb)
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| 118 | del tb
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| 119 | finally:
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| 120 | sys.stdin, sys.stdout, sys.stderr = save
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| 121 |
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| 122 | from code import compile_command
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| 123 |
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| 124 | main()
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