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[#2200] ddns_update hook added in v4

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This commit is contained in:
Tomek Mrugalski
2022-02-14 16:15:35 +01:00
committed by Thomas Markwalder
parent 1b8c614327
commit fc1adae2fd
2 changed files with 44 additions and 0 deletions
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39
src/bin/dhcp4/dhcp4_srv.cc
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@@ -94,6 +94,7 @@ struct Dhcp4Hooks {
int hook_index_buffer4_send_; ///< index for "buffer4_send" hook point
int hook_index_lease4_decline_; ///< index for "lease4_decline" hook point
int hook_index_host4_identifier_; ///< index for "host4_identifier" hook point
int hook_index_ddns_update_; ///< index for "ddns_update" hook point
/// Constructor that registers hook points for DHCPv4 engine
Dhcp4Hooks() {
@@ -106,6 +107,7 @@ struct Dhcp4Hooks {
hook_index_buffer4_send_ = HooksManager::registerHook("buffer4_send");
hook_index_lease4_decline_ = HooksManager::registerHook("lease4_decline");
hook_index_host4_identifier_ = HooksManager::registerHook("host4_identifier");
hook_index_ddns_update_ = HooksManager::registerHook("ddns_update");
}
};
@@ -2096,6 +2098,43 @@ Dhcpv4Srv::processClientName(Dhcpv4Exchange& ex) {
}
}
// Optionally, call a hook that may possibly override the decisions made
// earlier.
if (HooksManager::calloutsPresent(Hooks.hook_index_ddns_update_)) {
Pkt4Ptr query = ex.getQuery();
CalloutHandlePtr callout_handle = getCalloutHandle(query);
// Pass incoming packet as argument
callout_handle->setArgument("query4", query);
callout_handle->setArgument("response4", resp);
callout_handle->setArgument("hostname", hostname);
callout_handle->setArgument("fwd-update", fqdn_fwd);
callout_handle->setArgument("rev-update", fqdn_rev);
// Call callouts
HooksManager::callCallouts(Hooks.hook_index_ddns_update_, *callout_handle);
// Let's get the parameters returned by hook.
string hook_hostname;
bool hook_fqdn_fwd = false;
bool hook_fqdn_rev = false;
callout_handle->getArgument("hostname", hook_hostname);
callout_handle->getArgument("fwd-update", hook_fqdn_fwd);
callout_handle->getArgument("rev-update", hook_fqdn_rev);
// If there's anything changed by the hook, log it and then update the parameters
if ( (hostname != hook_hostname) || (fqdn_fwd != hook_fqdn_fwd) ||
(fqdn_rev != hook_fqdn_rev)) {
LOG_DEBUG(hooks_logger, DBGLVL_PKT_HANDLING, DHCP4_HOOK_DDNS_UPDATE)
.arg(hostname).arg(hook_hostname).arg(fqdn_fwd).arg(hook_fqdn_fwd)
.arg(fqdn_rev).arg(hook_fqdn_rev);
hostname = hook_hostname;
fqdn_fwd = hook_fqdn_fwd;
fqdn_rev = hook_fqdn_rev;
}
}
// Update the context
auto ctx = ex.getContext();
ctx->fwd_dns_update_ = fqdn_fwd;