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I am behind a proxy server in my college. It uses a simple username and password authentication. And i connect to the proxy server to port 3128. now i want to telnet simply to say any website on the internet like

$ telnet www.google.com 80

this gives me

error telnet: could not resolve www.udacity.com/80: Name or service not known

How can I define the proxy settings for telnet? I have already set environment variables http_proxy and HTTP_PROXY. Also have applied system wide proxy.

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2 Answers 2

up vote 3 down vote accepted

You can use Proxychains for this.

First install proxychains, using the command:

$ apt-get install proxychains

Then configure your proxy settings in /etc/proxychains.conf file.

Add at last, these lines for HTTP and HTTPS proxy.

http    proxy-ip   proxy-port    username        password
https   proxy-ip   proxy-port    username        password

Now you can do telnet by using the following command:

$ proxychains telnet www.google.com 3128

In case of any problem, you can comment in this thread.

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i am getting this error: aakash@sigdel:~$ proxychains telnet www.google.com 3128ProxyChains-3.1 (proxychains.sf.net) |DNS-response|: sigdel is not exist |DNS-request| www.google.com |S-chain|-<>-127.0.0.1:9050-<--timeout |DNS-response|: www.google.com is not exist telnet: could not resolve www.google.com/3128: Unknown error –  Aakash Sigdel Apr 23 '12 at 2:21
    
@AakashSigdel: Sorry, the last command which I wrote should be $ proxychains telnet www.google.com 80. It should work now !! –  pradeepchhetri Apr 23 '12 at 3:37

You could do what the browser does, i.e. connect to the proxy,

$ telnet proxy-server 3128

and talk to it. If there was no authentication, a simple GET request (followed by two newlines (Enter)) with a full hostname and protocol, e.g.

GET http://www.google.com/ HTTP/1.1

should suffice. Since you need authentication, you need to provide your username and password base64-encoded in a Proxy-Authentication header, e.g.

GET http://www.google.com/ HTTP/1.1
Proxy-Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=

see this blog post for a Perl snippet and details; its comment thread contains simpler commands, such as echo -n username:password | openssl base64

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