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proxy_pac.md

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Managing Proxy Auto-Configuration (PAC) file

The example outlines how to integrate existing proxy.pac file to DataScript Lua code and serve it to the end users.

  1. Proxy Auto-Configuration (PAC) file.

    function FindProxyForURL(url, host) {
  if (isPlainHostName(host) ||
      dnsDomainIs(host, ".avinetworks.com") ||
      isInNet(host, "192.168.0.0", "255.255.0.0")) {
    return "DIRECT";
  } else {
    return "PROXY proxy.avinetworks.net:8080";
  }
}

  2. The above file has to be prepared/formatted for DataScript, leveraging sed function. The output of sed function will be used in DataScript.

    root@avitools:/tmp# sed ':a;N;$!ba;s/\n/\\n/g' proxy.pac
function FindProxyForURL(url, host) {\n  if (isPlainHostName(host) ||\n      dnsDomainIs(host, ".avinetworks.com") ||\n      isInNet(host, "192.168.0.0", "255.255.0.0")) {\n    return "DIRECT";\n  } else {\n    return "PROXY proxy.avinetworks.net:8080";\n  }\n}

  3. Create HTTP_REQ DataScript and associate it to the corresponding virtual service.

    -- HTTP_REQ
proxy_pac_body = 'function FindProxyForURL(url, host) {\n  if (isPlainHostName(host) ||\n      dnsDomainIs(host, ".avinetworks.com") ||\n      isInNet(host, "192.168.0.0", "255.255.0.0")) {\n    return "DIRECT";\n  } else {\n    return "PROXY proxy.avinetworks.net:8080";\n  }\n}'

if string.contains(avi.http.get_path(), 'proxy.pac') then
avi.http.response(200,{content_type="application/x-ns-proxy-autoconfig", pragma="no-cache"}, proxy_pac_body)
end

  4. Verify the applied DataScript.

    root@avitools:/tmp# curl -i http://10.57.0.52/proxy.pac
HTTP/1.1 200 OK
Content-Type: application/x-ns-proxy-autoconfig
Content-Length: 252
Connection: keep-alive
pragma: no-cache

function FindProxyForURL(url, host) {
  if (isPlainHostName(host) ||
      dnsDomainIs(host, ".avinetworks.com") ||
      isInNet(host, "192.168.0.0", "255.255.0.0")) {
    return "DIRECT";
  } else {
    return "PROXY proxy.avinetworks.net:8080";
  }
root@avitools:/tmp# apt-get install libpacparser1
root@avitools:/tmp# curl -O http://10.57.0.52/proxy.pac
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   253  100   253    0     0   1144      0 --:--:-- --:--:-- --:--:--  1150
root@avitools:/tmp# pactester -p proxy.pac -u http://www.avinetworks.com
DIRECT
root@avitools:/tmp# pactester -p proxy.pac -u http://vmware.com
PROXY proxy.avinetworks.net:8080