Created
September 13, 2015 23:20
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getRemoteAddress() for ColdFusion with or without common load balancers/firewalls
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| <cffunction name="getRemoteAddress" output="false" access="public" returntype="string" hint="Identify the remote user IP address"> | |
| <cfset var pc = getHTTPRequestData().headers /> | |
| <cfset var arrIP = "" /> | |
| <cfif structKeyExists(pc, "X-Forwarded-For") AND len(pc["X-Forwarded-For"])> | |
| <!--- the x-forwarded-for header sometimes includes values that are too long like "172.27.156.64, 67.98.222.16". The regexp picks out just the matches. http://support.f5.com/kb/en-us/solutions/public/12000/200/sol12264.html ---> | |
| <cfset arrIP = reMatch('\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b', pc["X-Forwarded-For"]) /> | |
| <cfif arrayLen(arrIP)> | |
| <cfreturn arrIP[1] /> | |
| <cfelse> | |
| <cfreturn CGI.remote_addr /> | |
| </cfif> | |
| <cfelse> | |
| <cfreturn CGI.remote_addr /> | |
| </cfif> | |
| </cffunction> |
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The regexp was pilfered from StackOverflow IIRC