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使用 PHP 網路開機

Jun 20, 2016 pm 12:39 PM

在區域網路中,可以傳送 Magic Packet 給主機的網路卡,Magic Packet 內容開頭有6個 "FF",再接 16 個網路卡 MAC,當主機版有開啟支援 Wake on LAN 功能,網路卡接收到符合條件的 Magic Packet,就能開啟電腦。(每個主機版關於 Wake on LAN 的名稱不盡相同,例如 PME Event Wake Up、Power On By PCI Devices...)

另一個影響能否網路開機的設定,在作業系統裡面裝置管理員,網卡裝置內容裡的電源管理,需勾選「允許這個裝置喚醒電腦」。

假設網路卡 MAC 為:01-02-03-04-05-06

Magic Packet 內容則為:

FFFFFFFFFFFF010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506010203040506
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然後以 UDP 通訊協定傳送給電腦的 port 7、或 port 9

所以實現網路開機的方式,就是在區網內想辦法傳送給目標電腦網卡 Magic Packet,如果用來傳送 Magic Packet 的設備(Server),平常也有對外連線,也可達成在外網開機的效果。

以下 PHP 傳送 Magic Packet 範例來源

WOL: Wake-on-LAN Tutorial with Bonus PHP Script

僅稍微修改後如下:

class WakeOnLan {    /**     * 喚醒電腦     * @param type $addr ,目標IP 或 廣播位址(格式 01-02-03-04-05-06 或 01:02:03:04:05:06)     * @param type $mac     * @param type $port , 7 or 9     * @return boolean     */    public function wake($addr, $mac, $port) {        $mac = str_replace("-", ":", $mac);        $addr_byte = explode(':', $mac);        $hw_addr = '';        for ($a = 0; $a < 6; $a++) {            $hw_addr .= chr(hexdec($addr_byte[$a]));        }        // 開頭六個 "FF"        $msg = chr(255) . chr(255) . chr(255) . chr(255) . chr(255) . chr(255);        // 16個MAC        for ($a = 1; $a <= 16; $a++) {            $msg .= $hw_addr;        }        // 開一個 UDP 的 socket        // AF_INET:IP4        // SOCK_DGRAM:The UDP protocol is based on this socket type        // SOL_UDP:使用 UDP 通訊協定        $skt = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);        $err = array();        if ($skt === false) {            $err[] = "Error creating socket!";            $err[] = "Error code is '" . socket_last_error($skt) . "' - " . socket_strerror(socket_last_error($skt));            throw new Exception(implode("\n", $err));        } else {            // 設定使用broadcast廣播訊息            // $opt_ret = socket_set_option($skt, 1, 6, TRUE);            $opt_ret = socket_set_option($skt, SOL_SOCKET, SO_BROADCAST, true);            if ($opt_ret === false) {                $err[] = "setsockopt() failed, error: " . socket_strerror(socket_last_error($skt));                throw new Exception(implode("\n", $err));            }            if (socket_sendto($skt, $msg, strlen($msg), 0, $addr, $port)) {                //Magic Packet sent successfully                $res = trim(socket_strerror(socket_last_error($skt)));                socket_close($skt);                return $res;            } else {                $err[] = "Magic packet failed!";                throw new Exception(implode("\n", $err));            }        }    }}$WOL = new WakeOnLan();try {    $res = $WOL->wake('192.168.0.255', "01-02-03-04-05-06", 7);    $res = $WOL->wake('192.168.0.255', "01-02-03-04-05-06", 9);    var_dump($res);} catch (Exception $ex) {    var_dump($ex->getMessage());}
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  • 將 Magic Packet 指定傳給 broadcast address(例如:192.168.0.255),可傳送給區網所有電腦,MAC符合的才會開機。
  • 有的電腦可能傳給 port 7 或 port 9 其中一個才會開機。
  • 原範例 socket_set_option($skt, 1, 6, TRUE),1、6 改成用常數取代,因不同環境 SOL_SOCKET、SO_BROADCAST 的常數直似乎不同。查看所有 soket 常數 http://php.net/manual/en/sockets.constants.php#108291
    $a = get_defined_constants(TRUE);foreach ($a['sockets'] as $constant => $value) {    printf("%-25s %d", $constant, $value);}
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    網路喚醒 - 維基百科,自由的百科全書

    設定Windows 8網路喚醒(Wake On LAN) - 黑暗執行緒

    PHP: socket_create - Manual

    PHP: socket_set_option - Manual

    PHP: socket_get_option - Manual

    arduino - PHP : Send an UDP broadcast message , and wait the response - Stack Overflow

    小信豬的原始部落: [TCP/IP Illustrated] Broadcasting & Multicasting
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