add hg and python

1 files changed, 109 insertions, 0 deletions

diff --git a/sys/src/cmd/python/Demo/sockets/telnet.py b/sys/src/cmd/python/Demo/sockets/telnet.py
new file mode 100755
index 000000000..d50c37f2c
--- /dev/null
+++ b/sys/src/cmd/python/Demo/sockets/telnet.py
@@ -0,0 +1,109 @@
+#! /usr/bin/env python
+
+# Minimal interface to the Internet telnet protocol.
+#
+# It refuses all telnet options and does not recognize any of the other
+# telnet commands, but can still be used to connect in line-by-line mode.
+# It's also useful to play with a number of other services,
+# like time, finger, smtp and even ftp.
+#
+# Usage: telnet host [port]
+#
+# The port may be a service name or a decimal port number;
+# it defaults to 'telnet'.
+
+
+import sys, posix, time
+from socket import *
+
+BUFSIZE = 1024
+
+# Telnet protocol characters
+
+IAC  = chr(255) # Interpret as command
+DONT = chr(254)
+DO   = chr(253)
+WONT = chr(252)
+WILL = chr(251)
+
+def main():
+    host = sys.argv[1]
+    try:
+        hostaddr = gethostbyname(host)
+    except error:
+        sys.stderr.write(sys.argv[1] + ': bad host name\n')
+        sys.exit(2)
+    #
+    if len(sys.argv) > 2:
+        servname = sys.argv[2]
+    else:
+        servname = 'telnet'
+    #
+    if '0' <= servname[:1] <= '9':
+        port = eval(servname)
+    else:
+        try:
+            port = getservbyname(servname, 'tcp')
+        except error:
+            sys.stderr.write(servname + ': bad tcp service name\n')
+            sys.exit(2)
+    #
+    s = socket(AF_INET, SOCK_STREAM)
+    #
+    try:
+        s.connect((host, port))
+    except error, msg:
+        sys.stderr.write('connect failed: ' + repr(msg) + '\n')
+        sys.exit(1)
+    #
+    pid = posix.fork()
+    #
+    if pid == 0:
+        # child -- read stdin, write socket
+        while 1:
+            line = sys.stdin.readline()
+            s.send(line)
+    else:
+        # parent -- read socket, write stdout
+        iac = 0         # Interpret next char as command
+        opt = ''        # Interpret next char as option
+        while 1:
+            data = s.recv(BUFSIZE)
+            if not data:
+                # EOF; kill child and exit
+                sys.stderr.write( '(Closed by remote host)\n')
+                posix.kill(pid, 9)
+                sys.exit(1)
+            cleandata = ''
+            for c in data:
+                if opt:
+                    print ord(c)
+                    s.send(opt + c)
+                    opt = ''
+                elif iac:
+                    iac = 0
+                    if c == IAC:
+                        cleandata = cleandata + c
+                    elif c in (DO, DONT):
+                        if c == DO: print '(DO)',
+                        else: print '(DONT)',
+                        opt = IAC + WONT
+                    elif c in (WILL, WONT):
+                        if c == WILL: print '(WILL)',
+                        else: print '(WONT)',
+                        opt = IAC + DONT
+                    else:
+                        print '(command)', ord(c)
+                elif c == IAC:
+                    iac = 1
+                    print '(IAC)',
+                else:
+                    cleandata = cleandata + c
+            sys.stdout.write(cleandata)
+            sys.stdout.flush()
+
+
+try:
+    main()
+except KeyboardInterrupt:
+    pass