VirtFusion's IPv6 allocation model routes a whole /64 to the VPS rather
than exposing discrete host addresses via the API. The previous module
silently filtered these entries — the client saw v4 IPs in the rDNS
panel but no v6 at all, with no indication why, and no way to set a
PTR for a specific address they were using inside the /64.
This commit surfaces subnets as first-class entries throughout:
- IpUtil::extractIps() now returns {addresses, subnets, skipped}. The
subnets bucket carries {subnet, cidr} pairs for any v6 allocation
with cidr != 128; /128 entries continue to be treated as discrete
addresses, and genuinely malformed entries still go to skipped.
- IpUtil::ipv6InSubnet($ip, $prefix, $cidrBits) — new helper that does
binary-prefix subnet containment via inet_pton + bit masking. Used
for v6 ownership verification (see below).
- PtrManager::listPtrs() emits subnet-only rows ahead of per-IP rows,
so the client UI can render the /64 as an informational anchor with
an entry point for the custom-host flow.
- client.php::rdnsUpdate adds a second ownership-check stage: if the
submitted IP is v6 AND doesn't match any discrete address, check
whether it falls inside one of the server's allocated subnets. This
preserves "only your own IPs" while unlocking the feature.
- Client-side (module.js / module.css) renders subnet rows with a
collapsible "Add host PTR" form (IP + hostname inputs) that posts
to the same rdnsUpdate endpoint. Subnet rows get a distinct cyan
accent so they visually differ from per-host rows.
The usual guards still apply to v6 custom-host writes: forward-DNS
(FCrDNS) verification, PTR regex, per-IP rate limit, same-origin /
POST-method gates. Nothing about the security envelope changes — only
what input is accepted as "you own this IP".
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Introduces an opt-in reverse DNS management subsystem backed by a PowerDNS
Authoritative HTTP API. Runs via a companion WHMCS addon module
(modules/addons/VirtFusionDns) that holds settings and a Test Connection
page; the server module reads those settings from tbladdonmodules and
short-circuits when the addon is absent or disabled, so provisioning is
unaffected for operators who don't use the feature.
Lifecycle hooks:
- createAccount creates PTRs for every assigned IP (forward DNS must
already resolve to the IP — FCrDNS enforcement)
- renameServer updates only PTRs whose content matched the old hostname,
preserving client-custom records
- terminateAccount deletes all PTRs before the local state is purged
- TestConnection merges PowerDNS health check with the existing VirtFusion
check
- A DailyCronJob hook reconciles missing PTRs additive-only (never
overwrites)
Client UI: new "Reverse DNS" panel on the service overview with one
editable PTR input per assigned IP, per-row status badges, and
forward-DNS rejection on save. Admin services tab gets a parallel
widget with Reconcile (additive) and Reconcile (force reset) buttons.
New subsystem at lib/PowerDns/:
- Client.php PowerDNS API wrapper (X-API-Key, listZones/getZone/
patchRRset/notifyZone), auto-NOTIFY on successful PATCH
- Config.php Loads + decrypts addon settings from tbladdonmodules
- IpUtil.php PTR-name generation (IPv4 + IPv6), zone matching,
RFC 2317 classless parsing
- Resolver.php FCrDNS verification via dns_get_record with CNAME-chain
following and per-(hostname,ip) caching
- PtrManager.php Orchestrator: syncServer, deleteForServer, listPtrs,
setPtr, reconcile, reconcileAll
Security hardening helpers added to Module and applied to the rDNS
endpoints:
- requirePost() HTTP method gate (405 on non-POST mutations)
- requireSameOrigin() Origin/Referer check against WHMCS host (CSRF
defence against cross-site form POST)
- requireServiceStatus() tblhosting.domainstatus filter (Active for
writes, Active+Suspended for reads)
RFC 2317 classless delegations (e.g. 64/64.113.0.203.in-addr.arpa.)
supported with alignment validation: rejects misaligned start addresses
that don't correspond to any real delegation boundary.
PowerDNS zone IDs containing '/' are URL-encoded as '=2F' per the
PowerDNS API convention. PATCH success triggers PUT /zones/{id}/notify
so slaves pick up the SOA-bumped serial immediately.
Includes IPv4 + IPv6 support, per-IP write rate limit (10s), fresh
IP-ownership re-verification on every client write (defends against
stale-ownership after IP reassignment), and audit logging of every
successful edit to the WHMCS module log.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
