#62 NoProxy Regex or Extended Wildcard Matching

[Felix]

I realized it is very hard to wildcard-match hostnames that contain NO dots. I ended up with this "NoProxy *[!.]???", which doesn't really work. Is there some way to exclude simple hostnames without dots from using parent proxy? If not, I'd like to use a regular expression or extended wildcard to exclude those hostnames.

[Nathan Revo]

Update: I was able to match a simple hostname using the following

NoProxy [:alnum:]*

End Update

I have run into this same issue. Many of our developers access systems with the simple hostname, and thus it is always being directed through the corporate proxy. I would love to have the developers use the FQDN, but most forget/refuse.

examples of hosts that should bypass the proxy:
utdev100
utaba009
txabc123

Looking through the code I found the use of the function "fnmatch()", hoping to figure out how to match a string with no dots. So far nothing has worked.

http://man7.org/linux/man-pages/man3/fnmatch.3.html
http://man7.org/linux/man-pages/man7/glob.7.html

I have tried all variations of the *[!.] expression in hope of matching a simple hostname (NO dots), with no luck so far. Some of them match, but they also match things like 'www.google.com' and 'www.ibm.com'.

Here are my attempts: "NoProxy [!.], ?[^.], ?[!.], +, .+, !+[.], ![.]+, +[^.], +[!.], [^.]+, [!.]+"

P.S. The code reference is in main.c function noproxy_match.

[Felix]

Hi Nathan,
thanks for pointing me to the man pages, I gave it one more though and came up with this workaround

NoProxy *[!.][!.][!.][!.][!.]

which will match any string that doesn't have a dot in the last 5 characters. Obviously this won't work with top level domains longer than 4 characters.
I think your suggested solution

NoProxy [:alnum:]*

won't work because it'll match a single alpha-numeric character followed by any number of other characters. Don't confuse globbing with regular expressions.
So now we have a workaround, but regex support would still be a nice feature.

Please tell me if my workaround works for you.
Felix