protected synchronized void ensureAclsUptodate() {
if (lastLoadTime > aclFile.lastModified()) {
return;
}
try {
aclEntries = load();
println("ACLs reloaded from file");
return;
} catch (Exception e) {
println("Failed to reload ACL file. Retaining old ACLs. " + e);
}
}
/**
* Uses system network libraries to resolve the given String to an IP addr, then determine whether
* this address is permitted or denied.
*
* <p>Specified name may be a numerical-based String like "1.2.3.4", a constant known to the
* networking libraries, or a host name to be resolved by the systems name resolution system.
*
* <p>If the given String can't be resolved to an IP addr, false is returned.
*
* @see #permitAccess(byte[])
*/
public boolean permitAccess(String s) {
try {
return permitAccess(InetAddress.getByName(s).getAddress());
} catch (UnknownHostException uke) {
println("'" + s + "' denied because failed to resolve to an addr");
return false; // Resolution of candidate failed
}
}
/**
* @return true if access for the candidate address should be permitted, false if access should be
* denied.
* @throws RuntimeException if no rule covers the candidate address. This would be the case if
* this class is applied to some network protocol other than ipv4 or ipv6, without adding a
* default rule for it.
*/
public boolean permitAccess(byte[] addr) {
ensureAclsUptodate();
for (int i = 0; i < aclEntries.size(); i++) {
if (((AclEntry) aclEntries.get(i)).matches(addr)) {
AclEntry hit = (AclEntry) aclEntries.get(i);
println(
"Addr '" + ServerAcl.dottedNotation(addr) + "' matched rule #" + (i + 1) + ": " + hit);
return hit.allow;
}
}
throw new RuntimeException("No rule matches address '" + ServerAcl.dottedNotation(addr) + "'");
}