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https://issues.apache.org/jira/browse/TS-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Giles updated TS-1073:
----------------------------
Attachment: (was: TS-1073.patch)
> no_dns_just_forward_to_parent configuration parameter is ignored/not used.
> --------------------------------------------------------------------------
>
> Key: TS-1073
> URL: https://issues.apache.org/jira/browse/TS-1073
> Project: Traffic Server
> Issue Type: Bug
> Components: DNS
> Affects Versions: 3.0.2
> Environment: Ubuntu 10.0, Fedora 14
> Reporter: Kevin Giles
> Assignee: Leif Hedstrom
> Fix For: 3.1.3
>
>
> I have two instances of trafficserver configured, one instance is configured
> to use the second instance as a parent proxy using the following parameters
> from the records.config:
> CONFIG proxy.config.http.no_dns_just_forward_to_parent INT 1
> CONFIG proxy.config.http.parent_proxy_routing_enable INT 1
> The parent config looks like this:
> dest_domain=. parent="parent:8080" round_robin=false
> The no_dns_just_forward_to_parent is not used in the code and as a result dns
> lookups are being performed in the child instance.
> The following code changes seem to fix this:
> proxy/http/HttpSM.cc
> @@ -6406,11 +6405,20 @@
> t_state.dns_info.lookup_success = true;
> call_transact_and_set_next_state(NULL);
> break;
> } else if (t_state.parent_result.r == PARENT_UNDEFINED &&
> t_state.dns_info.lookup_success) {
> // Already set, and we don't have a parent proxy to lookup
> ink_assert(t_state.host_db_info.ip());
> Debug("dns", "[HttpTransact::HandleRequest] Skipping DNS lookup,
> provided by plugin");
> call_transact_and_set_next_state(NULL);
> break;
> + } else if (t_state.dns_info.looking_up == HttpTransact::ORIGIN_SERVER
> &&
> + t_state.http_config_param->no_dns_forward_to_parent){
> +
> + if(t_state.cop_test_page) {
> + t_state.host_db_info.ip()
> =t_state.state_machine->ua_session->get_netvc()->get_local_ip();
> + }
> +
> + t_state.dns_info.lookup_success = true;
> + call_transact_and_set_next_state(NULL);
> + break;
> }
>
> HTTP_SM_SET_DEFAULT_HANDLER(&HttpSM::state_hostdb_lookup);
> to avoid reverse ns lookups
> /proxy/http/HttpTransact.cc
> @@ -1650,7 +1651,8 @@
> } else if (s->dns_info.lookup_name[0] <= '9' &&
> s->dns_info.lookup_name[0] >= '0' &&
> //(s->state_machine->authAdapter.needs_rev_dns() ||
> - ( host_rule_in_CacheControlTable() ||
> s->parent_params->ParentTable->hostMatch)) {
> + ( host_rule_in_CacheControlTable() ||
> s->parent_params->ParentTable->hostMatch) &&
> + !s->http_config_param->no_dns_forward_to_parent) {
> // note, broken logic: ACC fudges the OR stmt to always be true,
> // 'AuthHttpAdapter' should do the rev-dns if needed, not here .
> TRANSACT_RETURN(REVERSE_DNS_LOOKUP, HttpTransact::StartAccessControl);
> I would like to have these changes applied to the repository if they look ok.
> I also created an empty resolv.conf and pointed ats to the empty file:
> CONFIG proxy.config.dns.resolv_conf STRING
> /usr/local/etc/trafficserver/resolv.conf
> When these changes are applied the child instance no longer attempts to
> perform dns lookups for the
> http requests that it receives. If they are not applied and the dns lookup it
> slow or unreliable on the
> child then the http requests are blocked by the dns lookup within the child
> trafficserver instance.
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