WordPress/wp-trackback.php

<?php
require(dirname(__FILE__) . '/wp-config.php');
if (!empty($HTTP_GET_VARS['tb_id'])) {
	// trackback is done by a GET
	$tb_id = intval($HTTP_GET_VARS['tb_id']);
	$tb_url = $HTTP_GET_VARS['url'];
	$title = $HTTP_GET_VARS['title'];
	$excerpt = $HTTP_GET_VARS['excerpt'];
	$blog_name = $HTTP_GET_VARS['blog_name'];
} elseif (!empty($HTTP_POST_VARS['url'])) {
	// trackback is done by a POST
	$request_array = 'HTTP_POST_VARS';
	$tb_id = explode('/', $HTTP_SERVER_VARS['REQUEST_URI']);
	$tb_id = intval($tb_id[count($tb_id)-1]);
	$tb_url = $HTTP_POST_VARS['url'];
	$title = $HTTP_POST_VARS['title'];
	$excerpt = $HTTP_POST_VARS['excerpt'];
	$blog_name = $HTTP_POST_VARS['blog_name'];
}

if ((strlen(''.$tb_id)) && (empty($HTTP_GET_VARS['__mode'])) && (strlen(''.$tb_url))) {

	@header('Content-Type: text/xml');

	if (!$use_trackback)
		trackback_response(1, 'Sorry, this weblog does not allow you to trackback its posts.');

	$pingstatus = $wpdb->get_var("SELECT ping_status FROM $tableposts WHERE ID = $tb_id");

	if ('closed' == $pingstatus)
		trackback_response(1, 'Sorry, trackbacks are closed for this item.');

	$tb_url = addslashes($tb_url);
	$title = strip_tags($title);
	$title = (strlen($title) > 255) ? substr($title, 0, 252).'...' : $title;
	$excerpt = strip_tags($excerpt);
	$excerpt = (strlen($excerpt) > 255) ? substr($excerpt, 0, 252).'...' : $excerpt;
	$blog_name = htmlspecialchars($blog_name);
	$blog_name = (strlen($blog_name) > 255) ? substr($blog_name, 0, 252).'...' : $blog_name;

	$comment = '<trackback />';
	$comment .= "<strong>$title</strong>\n$excerpt";

	$author = addslashes(stripslashes(stripslashes($blog_name)));
	$email = '';
	$original_comment = $comment;
	$comment_post_ID = $tb_id;

	$user_ip = $HTTP_SERVER_VARS['REMOTE_ADDR'];
	$user_domain = gethostbyaddr($user_ip);
	$time_difference = get_settings('time_difference');
	$now = current_time('mysql');

	$comment = convert_chars($comment);
	$comment = format_to_post($comment);

	$comment_author = $author;
	$comment_author_email = $email;
	$comment_author_url = $tb_url;

	$author = addslashes($author);

	$comment_moderation = get_settings('comment_moderation');
	$moderation_notify = get_settings('moderation_notify');

	if ('manual' == $comment_moderation) {
		$approved = 0;
	} else if ('auto' == $comment_moderation) {
		$approved = 0;
	} else { // none
		$approved = 1;
	}

	$result = $wpdb->query("INSERT INTO $tablecomments 
	(comment_post_ID, comment_author, comment_author_email, comment_author_url, comment_author_IP, comment_date, comment_content, comment_approved)
	VALUES 
	('$comment_post_ID', '$author', '$email', '$tb_url', '$user_ip', '$now', '$comment', '$approved')
	");

	if (!$result) {
		die ("There is an error with the database, it can't store your comment...<br />Please contact the <a href='mailto:$admin_email'>webmaster</a>.");
	} else {
		$comment_ID = $wpdb->get_var('SELECT last_insert_id()');
		if ($comments_notify)
			wp_notify_postauthor($comment_ID, 'trackback');
		trackback_response(0);
	}
}
?>