Dan V
e1a482c500
- Add Hook interface (filter + execute contract) in server/hooks/hook.h
- Add HookRunner in server/hooks/hook_runner.h: spawns a detached thread
per matching hook, with try/catch protection against crashes
- Add DnsUpdaterHook in server/hooks/dns_updater_hook.{h,cpp}:
triggers on server name changes, logs in to Technitium, deletes the
old A record (ignores 404), and adds the new A record
Config via env vars: TECHNITIUM_HOST/PORT/USER/PASS/ZONE, DNS_TTL
- Add Database::get_nics_for_server() to resolve a server's IPv4 address
- Wire HookRunner into InventoryServer; cmd_edit_server now fires hooks
with before/after Server snapshots
- Update CMakeLists.txt to include dns_updater_hook.cpp
- Document env vars in Dockerfile
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
79 lines
3.2 KiB
C++
79 lines
3.2 KiB
C++
#pragma once
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#include "server/hooks/hook.h"
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#include <arpa/inet.h>
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#include <cstring>
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#include <iostream>
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#include <netdb.h>
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#include <sstream>
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#include <stdexcept>
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#include <string>
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#include <sys/socket.h>
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#include <unistd.h>
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// ─────────────────────────────────────────────────────────────────────────────
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// DnsUpdaterHook
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//
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// Fires whenever a server's *name* changes. Updates Technitium DNS by:
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// 1. Logging in → GET /api/user/login?user=…&pass=… → token
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// 2. Deleting the old A record (404 errors are silently ignored)
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// 3. Adding the new A record
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//
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// The server's IP is derived from the first NIC ip_address that belongs to the
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// server record. This hook receives the old and new Server structs; to look up
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// IP addresses it needs access to the Database – pass a const ref in the ctor.
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//
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// Config is supplied via environment variables so no secrets land in source:
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// TECHNITIUM_HOST (default: 192.168.2.193)
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// TECHNITIUM_PORT (default: 5380)
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// TECHNITIUM_USER (default: admin)
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// TECHNITIUM_PASS (required – hook logs an error and skips if unset)
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// TECHNITIUM_ZONE (default: homelab)
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// DNS_TTL (default: 300)
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// ─────────────────────────────────────────────────────────────────────────────
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class Database; // forward declaration – full header included in .cpp
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class DnsUpdaterHook : public Hook {
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public:
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explicit DnsUpdaterHook(const Database& db) : db_(db) {}
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// Trigger only when the server name changes.
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bool filter(const Server& old_server, const Server& new_server) override {
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return old_server.name != new_server.name;
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}
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void execute(const Server& old_server, const Server& new_server) override;
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private:
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const Database& db_;
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// Resolve config from environment, falling back to defaults.
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struct Config {
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std::string host;
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int port;
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std::string user;
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std::string pass;
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std::string zone;
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int ttl;
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};
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static Config load_config();
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// Percent-encode a string for use in a URL query parameter.
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static std::string url_encode(const std::string& s);
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// Open a TCP connection; throws on failure.
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static int connect_to(const std::string& host, int port);
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// Send an HTTP/1.0 GET request and return the full response body.
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static std::string http_get(const std::string& host, int port,
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const std::string& path);
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// Send an HTTP/1.0 POST request (application/x-www-form-urlencoded body)
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// and return the full response body.
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static std::string http_post(const std::string& host, int port,
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const std::string& path,
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const std::string& body);
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// Minimal JSON value extractor – finds "key":"value" or "key":value.
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static std::string json_get(const std::string& json, const std::string& key);
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};
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