diff --git a/boardlink/main.php b/boardlink/main.php
new file mode 100644
index 00000000..cd493e3b
--- /dev/null
+++ b/boardlink/main.php
@@ -0,0 +1,251 @@
+<?php
+/*
+ *  Copyright (c) 2014 Marcin Łabanowski
+ */
+
+if (isset ($brd) && !defined("TINYBOARD")) {
+  define("BOARDLINK_IN", "callback");
+  require_once("inc/functions.php");
+}
+else if (defined ("TINYBOARD")) {
+  define("BOARDLINK_IN", "config");
+}
+else {
+  die("Access denied");
+}
+
+// Version history (protocol compatibility):
+// 1 - initial version
+define("BOARDLINK_VERSION", "1");
+
+$delete_from = false;
+
+class BoardLink {
+  function __construct($boardname, $self, $connected) {
+    $this->boardname = $boardname;
+    $this->self = $self;
+    $this->connected = $connected;
+
+    $this->queue = array();
+  }
+
+  function send_data($uri, $password, $data) {
+    ignore_user_abort(true); // this is a critical code, we don't want users to desync boards
+			     // by quitting at a random moment
+
+    $d = http_build_query(array('password' => $password,
+				   'from' => $this->self,
+				   'version' => BOARDLINK_VERSION,
+                                   'data' => serialize($data)));
+    $ctx = stream_context_create(array('http' => array(
+				         'method' => 'POST',
+                                         'header' => "Content-type: application/x-www-form-urlencoded\r\n".
+				                     "Content-length: ".strlen($d)."\r\n",
+					 'content' => $d)));
+    $this->queue[] = array($ctx, $uri, $data['action']);
+  }
+
+  function commit_send_as_last() {
+    register_shutdown_function(array($this, "commit_send"));
+  }
+
+  function commit_send() {
+    global $request_finished;
+
+    if (function_exists("fastcgi_finish_request") && !isset($request_finished)) {
+      fastcgi_finish_request(); // hooray! php-fpm!
+      $request_finished = true;
+    }
+
+    foreach ($this->queue as $value) {
+      list($ctx, $uri, $action) = $value;
+      $fp = file_get_contents($uri.'callback.php', false, $ctx);
+
+      _syslog(LOG_INFO, "BoardLink: sent query of type $action from {$this->self} to $uri. Query yielded $fp");
+    }
+
+    $this->queue = array();
+  }
+
+  function configure_board() {
+    global $config;
+
+    $config['blotter'] = "This board is synchronized with ";
+    $a = array_values($this->connected);
+    array_walk($a, function(&$v, $k){
+        $v = "<a href=\"$v\">$v</a>";
+    });
+    $count = count($a);
+
+    if ($count == 0) {
+        $synced = '';
+    } elseif ($count == 1) {
+        $synced = $a[0];
+    } else {
+        $synced = implode(', ', array_slice($a,0,$count-1)) . ' and ' . end($a);
+    }
+    $config['blotter'] .= $synced;
+
+    if ($config['vichan_federation']) {
+      if ($config['locale'] != "en") {
+        $config['locale'] = "en";
+        $config['file_script'] = "main-en.js";
+      }
+      $config['country_flags'] = true;
+    }
+
+    event_handler('delete', function($post) {
+      global $delete_from;
+
+      $data = array();
+      $data['action'] = 'delete';
+      $data['post'] = $post;
+      foreach ($this->connected as $password => $uri) {
+	if (!$delete_from || $delete_from != $uri) {
+	  $this->send_data($uri, $password, $data);
+	}
+      }
+      register_shutdown_function(array($this, "commit_send_as_last"));
+    });
+
+    event_handler('post-after', function($post) {
+      $data = array();
+      $data['action'] = 'create';
+      if (!isset ($post['ip'])) $post['ip'] = $_SERVER['REMOTE_ADDR'];
+      $data['post'] = $post;
+      foreach ($this->connected as $password => $uri) {
+	if (!isset($data['post']['origin']) || $data['post']['origin'] != $uri) {
+          $this->send_data($uri, $password, $data);
+	}
+      }
+      register_shutdown_function(array($this, "commit_send_as_last"));
+    });
+  }
+
+  function handle_error($err, $from, $sort) {
+    _syslog(LOG_INFO, "BoardLink: received query of type $sort from $from to {$this->self}. Query finished with $err");
+    die('{status:"'.$err.'",version:"'.BOARDLINK_VERSION.'"}');
+  }
+
+  function configure_callback() {
+    global $board, $config, $delete_from, $build_pages, $pdo;
+
+    if (!isset ($_POST['password'])) {
+      $this->handle_error("ERR_NOREQUEST", "nil", "nil");
+    }
+
+    if (!isset ($this->connected[$_POST['password']])) {
+      $this->handle_error("ERR_PASSWD", $_POST['from'], "nil");
+    }
+    $uri = $this->connected[$_POST['password']];
+    if ($uri != $_POST['from']) {
+      $this->handle_error("ERR_FROM", $_POST['from'], "nil");
+    }
+    $data = unserialize($_POST['data']);
+
+    openBoard($this->boardname);
+
+    switch ($data['action']) {
+      case 'create':
+        //Check if thread exists
+        if (!$data['post']['op']) {
+                $query = prepare(sprintf("SELECT `sticky`,`locked`,`sage` FROM ``posts_%s`` WHERE `id` = :id AND `thread` IS NULL LIMIT 1", $board['uri']));
+                $query->bindValue(':id', $data['post']['thread'], PDO::PARAM_INT);
+                $query->execute() or error(db_error());
+
+                if (!$thread = $query->fetch(PDO::FETCH_ASSOC)) {
+			$this->handle_error("ERR_DESYNC", $uri, $data['action']);
+                }
+
+                $numposts = numPosts($data['post']['thread']);
+        }
+
+        $a = array("src" => "file", "thumb" => "thumb");
+        foreach ($a as $dir => $field) {
+          if (isset($data['post'][$field]) && $data['post'][$field] &&
+              $data['post'][$field] != 'spoiler' && $data['post'][$field] != 'deleted') {
+	    // Security filename checks
+	    if (preg_match('@\.php|\.phtml|\.ht|\.\.|\x00|/@i', $data['post'][$field])) {
+	      $this->handle_error("ERR_SECURITY", $uri, $data['action']);
+	    }
+            $i = file_get_contents($uri.$dir.'/'.$data['post'][$field]);
+            file_put_contents($this->boardname.'/'.$dir.'/'.$data['post'][$field], $i);
+          }
+        }
+	$tmpid = post($data['post']);
+
+	// Post doesn't cover custom post IDs
+	$query = prepare(sprintf("UPDATE ``posts_%s`` SET `id`=:id WHERE `id`=:tmpid", $board['uri']));
+	$query->bindValue("id", $id = $data['post']['id']);
+	$query->bindValue("tmpid", $tmpid);
+	if (!$query->execute()) {
+		$query = prepare(sprintf("DELETE FROM ``posts_%s`` WHERE `id`=:tmpid", $board['uri']));
+		$query->bindValue("tmpid", $tmpid);
+		$query->execute();
+
+		// Reset the auto increment
+		query(sprintf("ALTER TABLE ``posts_%s`` AUTO_INCREMENT = 1", $board['uri']));
+
+		$this->handle_error("ERR_DUPLICATE_ID", $uri, $data['action']);		
+	}
+
+	// Reset the auto increment
+	query(sprintf("ALTER TABLE ``posts_%s`` AUTO_INCREMENT = 1", $board['uri']));
+
+	$post = &$data['post'];
+	$post['origin'] = $uri;
+
+	// The rest is just a copied code from post.php
+
+        if (isset($post['tracked_cites']) && !empty($post['tracked_cites'])) {
+                $insert_rows = array();
+                foreach ($post['tracked_cites'] as $cite) {
+                        $insert_rows[] = '(' .
+                                $pdo->quote($board['uri']) . ', ' . (int)$id . ', ' .
+                                $pdo->quote($cite[0]) . ', ' . (int)$cite[1] . ')';
+                }
+                query('INSERT INTO ``cites`` VALUES ' . implode(', ', $insert_rows)) or error(db_error());
+        }
+
+        if (!$post['op'] && strtolower($post['email']) != 'sage' && !$thread['sage'] && ($config['reply_limit'] == 0
+			|| $numposts['replies']+1 < $config['reply_limit'])) {
+                bumpThread($post['thread']);
+        }
+
+        buildThread($post['op'] ? $id : $post['thread']);
+        
+        if ($config['try_smarter'] && $post['op'])
+                $build_pages = range(1, $config['max_pages']);
+
+        if ($post['op'])
+                clean();
+                
+        event('post-after', $post);
+        
+        buildIndex();
+
+        if ($post['op'])
+                rebuildThemes('post-thread', $board['uri']);
+        else
+                rebuildThemes('post', $board['uri']);
+
+        break;
+
+      case 'delete':
+	$delete_from = $uri;
+	deletePost($data['post']['id'], false);
+	$delete_from = false;
+
+        buildIndex();
+        rebuildThemes('post-delete', $board['uri']);
+
+        break;
+
+      default:
+        $this->handle_error("ERR_UNSUPPORTED", $uri, $data['action']);
+    }
+
+    $this->handle_error("OK", $uri, $data['action']);
+  }
+}
+?>