Mercurial > cpython-lru_cache-weakref
annotate Demo/threads/telnet.py @ 5817:48b94de85bf3 legacy-trunk
Extensive changes by AMK.
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Thu, 17 Jul 1997 16:29:42 +0000 |
| parents | 59039c0856c9 |
| children | b3420b002d55 |
| rev | line source |
|---|---|
| 937 | 1 # Minimal interface to the Internet telnet protocol. |
| 2 # | |
| 3 # *** modified to use threads *** | |
| 4 # | |
| 5 # It refuses all telnet options and does not recognize any of the other | |
| 6 # telnet commands, but can still be used to connect in line-by-line mode. | |
| 7 # It's also useful to play with a number of other services, | |
| 8 # like time, finger, smtp and even ftp. | |
| 9 # | |
| 10 # Usage: telnet host [port] | |
| 11 # | |
| 12 # The port may be a service name or a decimal port number; | |
| 13 # it defaults to 'telnet'. | |
| 14 | |
| 15 | |
| 16 import sys, os, time | |
| 17 from socket import * | |
| 18 import thread | |
| 19 | |
| 20 BUFSIZE = 8*1024 | |
| 21 | |
| 22 # Telnet protocol characters | |
| 23 | |
| 24 IAC = chr(255) # Interpret as command | |
| 25 DONT = chr(254) | |
| 26 DO = chr(253) | |
| 27 WONT = chr(252) | |
| 28 WILL = chr(251) | |
| 29 | |
| 30 def main(): | |
|
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9c707d8cf0c8
*** empty log message ***
Guido van Rossum <guido@python.org>
parents:
937
diff
changeset
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31 if len(sys.argv) != 2: |
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9c707d8cf0c8
*** empty log message ***
Guido van Rossum <guido@python.org>
parents:
937
diff
changeset
|
32 sys.stderr.write('usage: telnet hostname\n') |
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9c707d8cf0c8
*** empty log message ***
Guido van Rossum <guido@python.org>
parents:
937
diff
changeset
|
33 sys.exit(2) |
| 937 | 34 host = sys.argv[1] |
| 35 try: | |
| 36 hostaddr = gethostbyname(host) | |
| 37 except error: | |
| 38 sys.stderr.write(sys.argv[1] + ': bad host name\n') | |
| 39 sys.exit(2) | |
| 40 # | |
| 41 if len(sys.argv) > 2: | |
| 42 servname = sys.argv[2] | |
| 43 else: | |
| 44 servname = 'telnet' | |
| 45 # | |
| 46 if '0' <= servname[:1] <= '9': | |
| 47 port = eval(servname) | |
| 48 else: | |
| 49 try: | |
| 50 port = getservbyname(servname, 'tcp') | |
| 51 except error: | |
| 52 sys.stderr.write(servname + ': bad tcp service name\n') | |
| 53 sys.exit(2) | |
| 54 # | |
| 55 s = socket(AF_INET, SOCK_STREAM) | |
| 56 # | |
| 57 try: | |
| 58 s.connect(host, port) | |
| 59 except error, msg: | |
| 60 sys.stderr.write('connect failed: ' + `msg` + '\n') | |
| 61 sys.exit(1) | |
| 62 # | |
| 63 thread.start_new(child, (s,)) | |
| 64 parent(s) | |
| 65 | |
| 66 def parent(s): | |
| 67 # read socket, write stdout | |
| 68 iac = 0 # Interpret next char as command | |
| 69 opt = '' # Interpret next char as option | |
| 70 while 1: | |
| 71 data, dummy = s.recvfrom(BUFSIZE) | |
| 72 if not data: | |
| 73 # EOF -- exit | |
| 74 sys.stderr.write( '(Closed by remote host)\n') | |
|
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59039c0856c9
Don't use thread.exit_prog; let child die if EOF read
Guido van Rossum <guido@python.org>
parents:
1430
diff
changeset
|
75 sys.exit(1) |
| 937 | 76 cleandata = '' |
| 77 for c in data: | |
| 78 if opt: | |
| 79 print ord(c) | |
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Guido van Rossum <guido@python.org>
parents:
937
diff
changeset
|
80 ## print '(replying: ' + `opt+c` + ')' |
| 937 | 81 s.send(opt + c) |
| 82 opt = '' | |
| 83 elif iac: | |
| 84 iac = 0 | |
| 85 if c == IAC: | |
| 86 cleandata = cleandata + c | |
| 87 elif c in (DO, DONT): | |
| 88 if c == DO: print '(DO)', | |
| 89 else: print '(DONT)', | |
| 90 opt = IAC + WONT | |
| 91 elif c in (WILL, WONT): | |
| 92 if c == WILL: print '(WILL)', | |
| 93 else: print '(WONT)', | |
| 94 opt = IAC + DONT | |
| 95 else: | |
| 96 print '(command)', ord(c) | |
| 97 elif c == IAC: | |
| 98 iac = 1 | |
| 99 print '(IAC)', | |
| 100 else: | |
| 101 cleandata = cleandata + c | |
| 102 sys.stdout.write(cleandata) | |
| 103 sys.stdout.flush() | |
| 104 ## print 'Out:', `cleandata` | |
| 105 | |
| 106 def child(s): | |
| 107 # read stdin, write socket | |
| 108 while 1: | |
| 109 line = sys.stdin.readline() | |
| 110 ## print 'Got:', `line` | |
|
1634
59039c0856c9
Don't use thread.exit_prog; let child die if EOF read
Guido van Rossum <guido@python.org>
parents:
1430
diff
changeset
|
111 if not line: break |
| 937 | 112 s.send(line) |
| 113 | |
| 114 main() |