Small tweaks.

README.rst

@@ -849,19 +849,32 @@ you would like to use a proxy, you use the --proxy (or -P) command line argument
 to specify the proxy by name. For example::
 
    PROXIES = {
-       'work_proxy':   'proxytunnel -q -p webproxy.ext.workinghard.com:80 -d %h:%p',
-       'school_proxy': 'proxytunnel -q -p sproxy.fna.learning.edu:1080 -d %h:%p',
+       'work_proxy':   'corkscrew webproxy.ext.workinghard.com 80 %h %p',
+       'school_proxy': 'corkscrew sproxy.fna.learning.edu 1080 %h %p',
    }
 
 Two HTTP proxies are described, the first capable of bypassing the corporate 
-firewall and the second does the same for the school's firewall. If preferred, 
-you can use socat rather than proxytunnel to accomplish the same thing::
+firewall and the second does the same for the school's firewall. Each is 
+a command that takes its input from stdin and produces its output on stdout.  
+The program 'corkscrew' is designed to proxy a TCP connection through an HTTP 
+proxy.  The first two arguments are the host name and port number of the proxy.  
+corkscrew connects to the proxy and passes the third and fourth arguments, the 
+host name and port number of desired destination.
+
+There are many alternatives to corkscrew. One is socat::
 
    PROXIES = {
        'work_proxy':   'socat - PROXY:webproxy.ext.workinghard.com:%h:%p,proxyport=80',
        'school_proxy': 'socat - PROXY:sproxy.fna.learning.edu:%h:%p,proxyport=1080',
    }
 
+Another alternative is proxytunnel::
+
+   PROXIES = {
+       'work_proxy':   'proxytunnel -q -p webproxy.ext.workinghard.com:80 -d %h:%p',
+       'school_proxy': 'proxytunnel -q -p sproxy.fna.learning.edu:1080 -d %h:%p',
+   }
+
 When at work, you should generate your ssh config file using::
 
    gensshconfig --proxy=work_proxy

clean

@@ -7,6 +7,8 @@ rm -f README.pdf
 # the rest is common to all python directories
 rm -f *.pyc *.pyo .test*.sum expected result install.out
 rm -rf build *.egg-info dist __pycache__ .coverage .coverage-html
+rm -f resp*.html
+
 foreach i (*/clean)
     if ($i == "*/clean") break
     #echo $i

core.py

@@ -1,6 +1,6 @@
 # Core Internal Classes for SSHConfig
 
-from sshconfig import NetworkEntry, locations
+from sshconfig import NetworkEntry, locations, ports
 from scripts import join, normpath, head, Run, ScriptError
 import os
 
@@ -348,7 +348,8 @@ def initializeNetwork(network):
             script.wait()
     except AttributeError:
         pass
-    except ScriptError as error:
+    except ScriptError:
+        # not capturing output, so user should already have error message
         print("%s network init_script failed (ignored): '%s'" % (
             network.name(), str(script)
         ))

gensshconfig

@@ -111,7 +111,7 @@ if unknown:
     print('    ' + '\n    '.join(sorted(unknown)))
 
 # Get description of this situation
-desc = [network.Name(), 'network']
+desc = [network.Name() if network else 'Unknown', 'network']
 if networkDesc:
     desc += ['(%s)' % networkDesc]
 if locations.my_location:
@@ -150,7 +150,11 @@ body = []
 suffix = []
 
 # Output header
-header.append('# SSH Configuration for %s network.' % network.Name())
+header.append(
+    '# SSH Configuration for %s network.' % network.Name()
+    if network else
+    'unknown'
+)
 header.append(time.strftime("# Generated at %-I:%M %p on %d %B %Y."))
 header.append(dedent('''\
     #

sshconfig.py

@@ -21,6 +21,12 @@ def gethostname():
 def getusername():
     return getpass.getuser()
 
+# is_ip_addr {{{2
+import re
+ip_addr_ptn = re.compile(r"\A\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\s*\Z")
+def is_ip_addr(addr):
+    return ip_addr_ptn.match(addr)
+
 # VNC {{{2
 # Generates forwards for VNC
 def VNC(