Proxy server?

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  • Gary
    #1

    Proxy server?

    I've seen examples for HTTP and FTP use, but not for simply any TCP data on
    any port, which is what I require. Can anyone please point me in the right
    direction?

    TIA


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    • Diez B. Roggisch
      #2
      Re: Proxy server?

      Gary wrote:
      I've seen examples for HTTP and FTP use, but not for simply any TCP data
      on any port, which is what I require. Can anyone please point me in the
      right direction?
      For what? How to use such a thing, a transparent proxy? There is nothing to
      it, just plug it between your router and the internet, that's all.

      Or do you want to know how to capture all traffic using some other process,
      for analysis? Use wireshark.

      Diez

        Comment

        • Gary
          #3
          Re: Proxy server?


          "Diez B. Roggisch" <deets@nospam.w eb.dewrote in message
          news:6f5rteF89m uqU2@mid.uni-berlin.de...
          Gary wrote:
          For what?
          A non-transparent proxy, for anonymity purposes only.


            Comment

            • Diez B. Roggisch
              #4
              Re: Proxy server?

              Gary schrieb:
              "Diez B. Roggisch" <deets@nospam.w eb.dewrote in message
              news:6f5rteF89m uqU2@mid.uni-berlin.de...
              >Gary wrote:
              >
              >For what?
              >
              A non-transparent proxy, for anonymity purposes only.

              You can't make any TCP/IP communication run through a proxy, unless it's
              transparent.

              HTTP (and maybe FTP, I personally don't know) have that built-in, and of
              course anything that builds upon them (SOAP, XMLRPC).


              But e.g. CORBA or bittorrent or .... don't support that.

              You can try and install TOR or use it. It is a transparent proxy:

              http://wiki.noreply.org/noreply/TheOnionRouter/TransparentProxy


              Diez

                Comment

                • Gary
                  #5
                  Re: Proxy server?


                  "Diez B. Roggisch" <deets@nospam.w eb.dewrote in message
                  news:6f6sk7Fa4t f5U1@mid.uni-berlin.de...
                  Gary schrieb:
                  "Diez B. Roggisch" <deets@nospam.w eb.dewrote in message
                  news:6f5rteF89m uqU2@mid.uni-berlin.de...
                  You can't make any TCP/IP communication run through a proxy, unless it's
                  transparent.
                  Thanks for all the info.

                  I'm puzzled though that a such a transaction isn't possible by rewriting the
                  headers. So client X connects to my PS, which passes on the data to the
                  target but with the header changed to indicate the PS as the original
                  source. The intended target responds to the PS, this is then resent to
                  client X with the header modified so that the transaction appears
                  transparent. So it's *effectively* transparent target>client but
                  non-transparent client>target, if you see what I mean.

                  Can you please explain why this wouldn't work?

                  Thanks,
                  Gary


                    Comment

                    • Heiko Wundram
                      #6
                      Re: Proxy server?

                      Am Mittwoch, 30. Juli 2008 13:48:08 schrieb Gary:
                      "Diez B. Roggisch" <deets@nospam.w eb.dewrote in message
                      news:6f6sk7Fa4t f5U1@mid.uni-berlin.de...
                      >
                      Gary schrieb:
                      "Diez B. Roggisch" <deets@nospam.w eb.dewrote in message
                      news:6f5rteF89m uqU2@mid.uni-berlin.de...
                      You can't make any TCP/IP communication run through a proxy, unless it's
                      transparent.
                      >
                      Thanks for all the info.
                      This is not entirely true. There are libc-plugins (i.e. LD_PRELOAD hacks)
                      which use SOCKS (which is a generic proxying protocol for [TCP/]IP) to
                      redirect all locally originating TCP/IP traffic _which is managed through the
                      socket interface of the libc_ in the application that you applied the
                      LD_PRELOAD hack to through a specified SOCKS-proxy (this should capture
                      pretty much everything, except for communication originating in the
                      *nix-kernel itself). I seem to recall that something similar exists for
                      WinSock, but I wouldn't know for sure.

                      Check the web for documentation on setting up a SOCKS proxy, and for the
                      respective libc-plugins or WinSock SOCKS "hack".

                      If you cannot make the user use SOCKS through a means like this (in which case
                      there has to be no application support) or by instructing a specific
                      application to use a SOCKS proxy directly (which all browsers can out of the
                      box AFAIK), and you don't have the possibility to put yourself somewhere in
                      the middle by means of a transparent proxy (i.e., a firewall applicance which
                      does this; I seem to recall that there was some FreeBSD-based software which
                      basically did just this kind of transparent proxying for a network), you're
                      out of luck, just like Diez said.

                      --
                      Heiko Wundram

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