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spf.inc.php
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spf.inc.php
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<?php
error_reporting(0);
function get_spf_allowed_hosts($check_domain, $expand_ipv6 = false) {
$hosts = array();
$records = dns_get_record($check_domain, DNS_TXT);
foreach ($records as $record)
{
$txt = explode(' ', $record['entries'][0]);
if (array_shift($txt) != 'v=spf1') // only handle SPF records
continue;
foreach ($txt as $mech)
{
$qual = substr($mech, 0, 1);
if ($qual == '-' || $qual == '~') // only handle pass or neutral records
continue(2);
if ($qual == '+' || $qual == '?')
$mech = substr($mech, 1); // remove the qualifier
if (strpos($mech, '=') !== FALSE) // handle a modifier
{
$mod = explode('=', $mech);
if ($mod[0] == 'redirect') // handle a redirect
{
$hosts = get_spf_allowed_hosts($mod[1],true);
return $hosts;
}
}
else
{
unset($cidr);
// reset domain to check_domain
$domain = $check_domain;
if (strpos($mech, ':') !== FALSE) // handle a domain specification
{
$split = explode(':', $mech);
$mech = array_shift($split);
$domain = implode(':', $split);
if (strpos($domain, '/') !== FALSE) // remove CIDR specification
{
$split = explode('/', $domain);
$domain = $split[0];
$cidr = $split[1];
}
}
$new_hosts = array();
if ($mech == 'include' && $check_domain != $domain) // handle an inclusion
{
$new_hosts = get_spf_allowed_hosts($domain);
}
elseif ($mech == 'a') // handle a mechanism
{
$new_hosts = get_a_hosts($domain);
}
elseif ($mech == 'mx') // handle mx mechanism
{
$new_hosts = get_mx_hosts($domain);
}
elseif ($mech == 'ip4' || $mech == 'ip6') // handle ip mechanism
{
$new_hosts = array($domain);
}
if (isset($cidr)) // add CIDR specification if present
{
foreach ($new_hosts as &$host)
{
$host .= '/' . $cidr;
}
unset($host);
}
$hosts = array_unique(array_merge($hosts,$new_hosts), SORT_REGULAR);
}
}
}
foreach ($hosts as &$host) {
if (filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
if ($expand_ipv6 === true) {
$hex = unpack("H*hex", inet_pton($host));
$host = substr(preg_replace("/([A-f0-9]{4})/", "$1:", $hex['hex']), 0, -1);
}
else {
$host = $host;
}
}
}
return $hosts;
}
function get_mx_hosts($domain)
{
$hosts = array();
try {
$mx_records = dns_get_record($domain, DNS_MX);
if ($mx_records) {
foreach ($mx_records as $mx_record) {
$new_hosts = get_a_hosts($mx_record['target']);
$hosts = array_unique(array_merge($hosts,$new_hosts), SORT_REGULAR);
}
}
}
catch (Exception $e) {
if ($e->getMessage() !== 'dns_get_record(): A temporary server error occurred.') {
throw $e;
}
$mx_records = false;
}
return $hosts;
}
function get_a_hosts($domain)
{
$hosts = array();
$a_records = dns_get_record($domain, DNS_A);
foreach ($a_records as $a_record)
{
$hosts[] = $a_record['ip'];
}
$a_records = dns_get_record($domain, DNS_AAAA);
foreach ($a_records as $a_record) {
$hosts[] = $a_record['ipv6'];
}
return $hosts;
}
function get_outgoing_hosts_best_guess($domain)
{
// try the SPF record to get hosts that are allowed to send outgoing mails for this domain
$hosts = get_spf_allowed_hosts($domain);
if ($hosts) return $hosts;
// try the MX record to get mail servers for this domain
$hosts = get_mx_hosts($domain);
if ($hosts) return $hosts;
// fall back to the A record to get the host name for this domain
return get_a_hosts($domain);
}
?>

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