ip-returner/index.php

<?php

$config = include('config.php');

$m = isset($_GET['m']) ? $_GET['m'] : false;
$t = isset($_GET['t']) ? $_GET['t'] : false;

// Define method by get parameter
if(empty($_GET)) {
  $method = "simple";
} elseif($m === "dns" && ! empty($t)) {
  $method = "dns";
} elseif($m === "ip" && ! empty($t)) {
  $method = "ip";
} elseif($m === "myself" && empty($t)) {
  $method = "myself";
} else {
  $method = "unknown";
}

if($method === "simple") {  // simple
  $ip = $_SERVER['REMOTE_ADDR'];
  echo $ip . "\n";
  exit;
} elseif($method === "myself" ) {  // detailed info about own IP
  $ip = $_SERVER['REMOTE_ADDR'];
  show_http_headers();
  show_hostname($ip);
  show_reverse($hostname);
  show_whois($ip);
} elseif($method === "ip" ) {  // detailed info an IP
  $ip = $t;
  show_hostname($ip);
  show_reverse($hostname);
  show_whois($ip);
} elseif($method === "dns" ) {  // detailed info a host name
  $hostname = $t;
  show_reverse($hostname);
  show_dnsrecords($hostname);
  show_whois($hostname);
} else if($method === "unknown") { // wrong URL
  header("HTTP/1.1 301 Moved Permanently");
  header("Location:/".$config->detailed_uri."");
  exit;
}
footer();

// HTTP HEADERS
function show_http_headers() {
  echo "<h2>YOUR HTTP HEADERS</h2>";
  readheader("REMOTE_ADDR");
  readheader("HTTP_X_FORWARDED_FOR");
  readheader("HTTP_USER_AGENT");
  readheader("HTTP_CLIENT_IP");
  readheader("HTTP_X_FORWARDED");
  readheader("HTTP_FORWARDED_FOR");
  readheader("HTTP_FORWARDED");
  readheader("HTTP_HOST");
  readheader("HTTP_URI");
  echo "<br />";
}
// DNS LOOKUP
function show_hostname($ip) {
  global $hostname;
  $hostname = ip2hostname($ip);
  echo "<strong>HOSTNAME</strong>: " . link_target($hostname);
  echo "<br />\n";
}
// REVERSE IP4 LOOKUP
function show_reverse($hostname) {
  global $hostname;
  $ip = hostname2ip($hostname);
  echo "<strong>IPv4 REVERSE LOOKUP</strong>: " . link_target($ip);
  echo "<br />\n";
}
// WHOIS
function show_whois($target) {
  echo "<h2>WHOIS</h2>\n";
  if(preg_match('/^(?!\-)(?:[a-zA-Z\d\-]{0,62}[a-zA-Z\d]\.){1,126}(?!\d+)[a-zA-Z\d]{1,63}$/', $target)) {
    // if domain, skip subdomains
    preg_match('/[a-zA-Z\d]+\.[a-zA-Z\d]+$/', $target, $m);
    $target = $m[0];
  }
  $whois = shell_exec("whois " . $target  );
  echo "<pre>"; print_r($whois); echo "</pre>";
  echo "<br />\n";
}
// DNSRECORDS
function show_dnsrecords($hostname) {
  echo "<h2>DNS Records</h2>\n";
  // A
  $dnsrecords = dnsrecords($hostname, "DNS_A");
  foreach($dnsrecords as $key=>$value) {
    echo "<strong>" . $value['type'] . "</strong>: ";
    echo link_target($value['ip']) . "<br />\n";
  }
  // AAAA
  $dnsrecords = dnsrecords($hostname, "DNS_AAAA");
  foreach($dnsrecords as $key=>$value) {
    echo "<strong>" . $value['type'] . "</strong>: ";
    echo link_target($value['ipv6']) . "<br />\n";
  }
  // MX
  $dnsrecords = dnsrecords($hostname, "DNS_MX");
  foreach($dnsrecords as $key=>$value) {
    echo "<strong>" . $value['type'] . "</strong>: ";
    echo link_target($value['target']) . " (" . $value['pri'] . ")<br />\n";
  }
  // NS
  $dnsrecords = dnsrecords($hostname, "DNS_NS");
  foreach($dnsrecords as $key=>$value) {
    echo "<strong>" . $value['type'] . "</strong>: ";
    echo link_target($value['target']) . "<br />\n";
  }
  // TXT
  $dnsrecords = dnsrecords($hostname, "DNS_TXT");
  foreach($dnsrecords as $key=>$value) {
    echo "<strong>" . $value['type'] . "</strong>: ";
    $i = 0;
    foreach($value['entries'] as $entry) {
      if($i !== 0){echo " | ";}
      echo $entry;
    }
    echo "<br />\n";
  }
  // SOA
  $dnsrecords = dnsrecords($hostname, "DNS_SOA");
  foreach($dnsrecords as $key=>$value) {
    echo "<strong>" . $value['type'] . "</strong>: ";
    echo "" . $value['mname'] . " (mname), ";
    echo "" . $value['rname'] . " (rname), ";
    echo "" . $value['serial'] . " (serial)<br />\n";
  }
  
  // OTHER
  $dnsrecords = dnsrecords($hostname, "OTHER");
  if(!empty($dnsrecords)) {
    echo "<strong>Other DNS records</strong>:<br/>\n ";
    echo "<pre>"; print_r($dnsrecords); echo "</pre>";
    echo "<br />\n";
  }
}
// PRINT FOOTER
function footer() {
  global $config;
  echo "<br /><hr /><br />\n";
  echo 'Your plain IP address: <a href="//'.$config->ip4domain.'">IPv4</a> | <a href="//'.$config->ip6domain.'">IPv6</a>';
  echo "<br />\n";
  echo 'Your detailed IP info: <a href="//'.$config->ip4domain.'/'.$config->detailed_uri.'">IPv4</a> | <a href="//'.$config->ip6domain.'/'.$config->detailed_uri.'">IPv6</a>';
}

// HELPER FUNCTIONS
function readheader($value) {
  echo "<strong>" . $value . "</strong>: "; // show desired value 
  if(isset($_SERVER[$value])) {   // only if desired header has been delivered 
    echo $_SERVER[$value];
  }
  echo "<br />\n";
}
function ip2hostname($ip) {
  $hostname = gethostbyaddr($ip);
  return $hostname;
}
function hostname2ip($hostname) {
  $ip = implode(', ', gethostbynamel($hostname));
  return $ip;
}
function dnsrecords($hostname, $record = "DNS_ALL") {
  if($record === "OTHER") {
    $dnsrecords = dns_get_record($hostname, DNS_ALL - DNS_A - DNS_AAAA - DNS_MX - DNS_NS - DNS_TXT - DNS_SOA);
  } else {
    $dnsrecords = dns_get_record($hostname, constant($record));
  }
  return $dnsrecords;
}
function link_target($target) {
  if(filter_var($target, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) || filter_var($target, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
    // target is an IP
    return "<a href='/ip/" . $target . "/'>" . $target . "</a>";
  } elseif(preg_match('/^(?!\-)(?:[a-zA-Z\d\-]{0,62}[a-zA-Z\d]\.){1,126}(?!\d+)[a-zA-Z\d]{1,63}$/', $target)) {
    return "<a href='/dns/" . $target . "/'>" . $target . "</a>";
  }
}

?>