+ wfProfileOut( $fname );
+ }
+
+ static function HTCPPurge( $urlArr ) {
+ global $wgHTCPMulticastAddress, $wgHTCPMulticastTTL, $wgHTCPPort;
+ $fname = 'SquidUpdate::HTCPPurge';
+ wfProfileIn( $fname );
+
+ $htcpOpCLR = 4; // HTCP CLR
+
+ // FIXME PHP doesn't support these socket constants (include/linux/in.h)
+ if( !defined( "IPPROTO_IP" ) ) {
+ define( "IPPROTO_IP", 0 );
+ define( "IP_MULTICAST_LOOP", 34 );
+ define( "IP_MULTICAST_TTL", 33 );
+ }
+
+ // pfsockopen doesn't work because we need set_sock_opt
+ $conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
+ if ( $conn ) {
+ // Set socket options
+ socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_LOOP, 0 );
+ if ( $wgHTCPMulticastTTL != 1 )
+ socket_set_option( $conn, IPPROTO_IP, IP_MULTICAST_TTL,
+ $wgHTCPMulticastTTL );
+
+ foreach ( $urlArr as $url ) {
+ if( !is_string( $url ) ) {
+ wfDebugDieBacktrace( 'Bad purge URL' );
+ }
+ $url = SquidUpdate::expand( $url );
+
+ // Construct a minimal HTCP request diagram
+ // as per RFC 2756
+ // Opcode 'CLR', no response desired, no auth
+ $htcpTransID = rand();
+
+ $htcpSpecifier = pack( 'na4na*na8n',
+ 4, 'HEAD', strlen( $url ), $url,
+ 8, 'HTTP/1.0', 0 );
+
+ $htcpDataLen = 8 + 2 + strlen( $htcpSpecifier );
+ $htcpLen = 4 + $htcpDataLen + 2;
+
+ // Note! Squid gets the bit order of the first
+ // word wrong, wrt the RFC. Apparently no other
+ // implementation exists, so adapt to Squid
+ $htcpPacket = pack( 'nxxnCxNxxa*n',
+ $htcpLen, $htcpDataLen, $htcpOpCLR,
+ $htcpTransID, $htcpSpecifier, 2);
+
+ // Send out
+ wfDebug( "Purging URL $url via HTCP\n" );
+ socket_sendto( $conn, $htcpPacket, $htcpLen, 0,
+ $wgHTCPMulticastAddress, $wgHTCPPort );
+ }
+ } else {
+ $errstr = socket_strerror( socket_last_error() );
+ wfDebug( "SquidUpdate::HTCPPurge(): Error opening UDP socket: $errstr\n" );
+ }
+ wfProfileOut( $fname );