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wp-trackback.php

<?php
/**
 * Handle Trackbacks and Pingbacks Sent to WordPress
 *
 * @since 0.71
 *
 * @package WordPress
 * @subpackage Trackbacks
 */

if ( empty( $wp ) ) {
	require_once __DIR__ . '/wp-load.php';
	wp( array( 'tb' => '1' ) );
}

// Always run as an unauthenticated user.
wp_set_current_user( 0 );

/**
 * Response to a trackback.
 *
 * Responds with an error or success XML message.
 *
 * @since 0.71
 *
 * @param int|bool $error         Whether there was an error.
 *                                Default '0'. Accepts '0' or '1', true or false.
 * @param string   $error_message Error message if an error occurred. Default empty string.
 */
function trackback_response( $error = 0, $error_message = '' ) {
	header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) );

if ( $error ) {
		echo '<?xml version="1.0" encoding="utf-8"?' . ">\n";
		echo "<response>\n";
		echo "<error>1</error>\n";
		echo "<message>$error_message</message>\n";
		echo '</response>';
		die();
	} else {
		echo '<?xml version="1.0" encoding="utf-8"?' . ">\n";
		echo "<response>\n";
		echo "<error>0</error>\n";
		echo '</response>';
	}
}

if ( ! isset( $_GET['tb_id'] ) || ! $_GET['tb_id'] ) {
	$post_id = explode( '/', $_SERVER['REQUEST_URI'] );
	$post_id = (int) $post_id[ count( $post_id ) - 1 ];
}

$trackback_url = isset( $_POST['url'] ) ? sanitize_url( $_POST['url'] ) : '';
$charset       = isset( $_POST['charset'] ) ? sanitize_text_field( $_POST['charset'] ) : '';

// These three are stripslashed here so they can be properly escaped after mb_convert_encoding().
$title     = isset( $_POST['title'] ) ? sanitize_text_field( wp_unslash( $_POST['title'] ) ) : '';
$excerpt   = isset( $_POST['excerpt'] ) ? sanitize_textarea_field( wp_unslash( $_POST['excerpt'] ) ) : '';
$blog_name = isset( $_POST['blog_name'] ) ? sanitize_text_field( wp_unslash( $_POST['blog_name'] ) ) : '';

if ( $charset ) {
	$charset = str_replace( array( ',', ' ' ), '', strtoupper( trim( $charset ) ) );

// Validate the specified "sender" charset is available on the receiving site.
	if ( function_exists( 'mb_list_encodings' ) && ! in_array( $charset, mb_list_encodings(), true ) ) {
		$charset = '';
	}
}

if ( ! $charset ) {
	$charset = 'ASCII, UTF-8, ISO-8859-1, JIS, EUC-JP, SJIS';
}

// No valid uses for UTF-7.
if ( str_contains( $charset, 'UTF-7' ) ) {
	die;
}

// For international trackbacks.
if ( function_exists( 'mb_convert_encoding' ) ) {
	$title     = mb_convert_encoding( $title, get_option( 'blog_charset' ), $charset );
	$excerpt   = mb_convert_encoding( $excerpt, get_option( 'blog_charset' ), $charset );
	$blog_name = mb_convert_encoding( $blog_name, get_option( 'blog_charset' ), $charset );
}

// Escape values to use in the trackback.
$title     = wp_slash( $title );
$excerpt   = wp_slash( $excerpt );
$blog_name = wp_slash( $blog_name );

if ( is_single() || is_page() ) {
	$post_id = $posts[0]->ID;
}

if ( ! isset( $post_id ) || ! (int) $post_id ) {
	trackback_response( 1, __( 'I really need an ID for this to work.' ) );
}

if ( empty( $title ) && empty( $trackback_url ) && empty( $blog_name ) ) {
	// If it doesn't look like a trackback at all.
	wp_redirect( get_permalink( $post_id ) );
	exit;
}

if ( ! empty( $trackback_url ) && ! empty( $title ) ) {
	/**
	 * Fires before the trackback is added to a post.
	 *
	 * @since 4.7.0
	 *
	 * @param int    $post_id       Post ID related to the trackback.
	 * @param string $trackback_url Trackback URL.
	 * @param string $charset       Character set.
	 * @param string $title         Trackback title.
	 * @param string $excerpt       Trackback excerpt.
	 * @param string $blog_name     Site name.
	 */
	do_action( 'pre_trackback_post', $post_id, $trackback_url, $charset, $title, $excerpt, $blog_name );

header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) );

if ( ! pings_open( $post_id ) ) {
		trackback_response( 1, __( 'Sorry, trackbacks are closed for this item.' ) );
	}

$title   = wp_html_excerpt( $title, 250, '&#8230;' );
	$excerpt = wp_html_excerpt( $excerpt, 252, '&#8230;' );

$comment_post_id      = (int) $post_id;
	$comment_author       = $blog_name;
	$comment_author_email = '';
	$comment_author_url   = $trackback_url;
	$comment_content      = "<strong>$title</strong>\n\n$excerpt";
	$comment_type         = 'trackback';

$dupe = $wpdb->get_results(
		$wpdb->prepare(
			"SELECT * FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_author_url = %s",
			$comment_post_id,
			$comment_author_url
		)
	);

if ( $dupe ) {
		trackback_response( 1, __( 'There is already a ping from that URL for this post.' ) );
	}

$commentdata = array(
		'comment_post_ID' => $comment_post_id,
	);

$commentdata += compact(
		'comment_author',
		'comment_author_email',
		'comment_author_url',
		'comment_content',
		'comment_type'
	);

$result = wp_new_comment( $commentdata );

if ( is_wp_error( $result ) ) {
		trackback_response( 1, $result->get_error_message() );
	}

$trackback_id = $wpdb->insert_id;

/**
	 * Fires after a trackback is added to a post.
	 *
	 * @since 1.2.0
	 *
	 * @param int $trackback_id Trackback ID.
	 */
	do_action( 'trackback_post', $trackback_id );

trackback_response( 0 );
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	makefntq/nobody	0750	2025-12-19 03:23:15
..	dir	-	makefntq/nobody	0750	2025-12-15 06:17:58
343294	dir	-	makefntq/makefntq	0755	2025-12-17 06:02:03
e9f5eedc	dir	-	makefntq/makefntq	0755	2025-12-18 08:37:55
old	dir	-	makefntq/makefntq	0755	2025-12-10 09:00:46
wordpress	dir	-	makefntq/makefntq	0755	2025-12-10 03:07:02
wp-admin	dir	-	makefntq/makefntq	0755	2025-12-18 01:02:05
wp-content	dir	-	makefntq/makefntq	0755	2025-12-19 08:06:45
wp-includes	dir	-	makefntq/makefntq	0755	2025-12-15 03:21:03
.hcflag	text/plain	30 B	makefntq/makefntq	0644	2025-12-16 09:34:57
.htaccess	text/plain	498 B	makefntq/makefntq	0644	2025-12-18 01:32:26
.htaccess.bk	text/plain	186 B	makefntq/makefntq	0644	2025-12-13 08:28:49
.litespeed_flag	text/plain	297 B	makefntq/makefntq	0644	2025-12-19 02:34:23
error_log	text/plain	148.32 KB	makefntq/makefntq	0644	2025-12-17 10:01:05
index.php	text/x-php	3.16 KB	makefntq/makefntq	0644	2025-12-18 01:32:20
license.txt	text/plain	19.44 KB	makefntq/makefntq	0644	2025-03-06 07:24:24
readme.html	text/html	7.25 KB	makefntq/makefntq	0644	2025-07-08 03:05:40
wp-activate.php	text/x-php	7.18 KB	makefntq/makefntq	0644	2025-10-08 07:02:34
wp-blog-header.php	text/x-php	351 B	makefntq/makefntq	0755	2020-02-06 11:33:12
wp-comments-post.php	text/x-php	2.27 KB	makefntq/makefntq	0644	2023-06-14 06:11:16
wp-config-sample.php	text/x-php	3.26 KB	makefntq/makefntq	0644	2025-08-12 06:47:32
wp-config.php	text/x-php	3.56 KB	makefntq/makefntq	0600	2025-12-13 08:28:49
wp-cron.php	text/x-php	5.49 KB	makefntq/makefntq	0644	2024-08-02 11:40:16
wp-links-opml.php	text/x-php	2.43 KB	makefntq/makefntq	0644	2025-04-30 04:52:30
wp-load.php	text/x-php	3.84 KB	makefntq/makefntq	0644	2024-03-11 02:05:16
wp-login.php	text/x-php	50.23 KB	makefntq/makefntq	0644	2025-10-29 02:37:34
wp-mail.php	text/x-php	8.52 KB	makefntq/makefntq	0644	2025-04-03 02:25:26
wp-settings.php	text/x-php	30.33 KB	makefntq/makefntq	0644	2025-11-07 05:42:34
wp-signup.php	text/x-php	33.71 KB	makefntq/makefntq	0644	2025-03-10 10:16:28
wp-trackback.php	text/x-php	5.09 KB	makefntq/makefntq	0644	2025-08-19 04:30:32
xmlrpc.php	text/x-php	3.13 KB	makefntq/makefntq	0644	2024-11-08 08:52:18

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