# Functions
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FilterResolvDns has two main jobs: 1.
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Retrieves the host /etc/resolv.conf file, checks against the last hash and, if modified since last check, returns the bytes and new hash.
retrieve the last used contents and hash of the host resolv.conf Used by containers updating on restart.
GetNameservers returns nameservers (if any) listed in /etc/resolv.conf.
GetNameserversAsCIDR returns nameservers (if any) listed in /etc/resolv.conf as CIDR blocks (e.g., "1.2.3.4/32") This function's output is intended for net.ParseCIDR.
GetSearchDomains returns search domains (if any) listed in /etc/resolv.conf If more than one search line is encountered, only the contents of the last one is returned.