关于php socket_addrinfo的几个方法[B君笔记][博客]

noscript{position: fixed}关于php socket_addrinfo的几个方法phpsocketsocket_addrinfo创建时间：2022-09-08 17:08:45

socket_addrinfo_lookup 和 socket_addrinfo_explain

IP地址查询

如果只是用来地址查询，那么类似的函数有gethostbyname或gethostbynamel，区别是后面2个函数只能获取ipv4地址。
而默认情况下，socket_addrinfo_lookup会获取全部ip地址，包括ipv6和ipv4。（读取地址时需要配合socket_addrinfo_explain函数）

var_dump(gethostbyname('cloudfare.com'));
/*
string(14) "172.67.211.231"
*/

var_dump(gethostbynamel('cloudfare.com'));
/*
array(2) {
  [0]=>
  string(14) "172.67.211.231"
  [1]=>
  string(13) "104.21.77.216"
}
*/

$addrinfo_arr = socket_addrinfo_lookup('cloudfare.com');
if(!empty($addrinfo_arr)){
    foreach ($addrinfo_arr as $addrinfo){
        $addrinfo_explain = socket_addrinfo_explain($addrinfo);
        var_dump($addrinfo_explain);

    }
}

/*
array(5) {
  ["ai_flags"]=>
  int(0)
  ["ai_family"]=>
  int(23)
  ["ai_socktype"]=>
  int(0)
  ["ai_protocol"]=>
  int(0)
  ["ai_addr"]=>
  array(2) {
    ["sin6_port"]=>
    int(0)
    ["sin6_addr"]=>
    string(25) "2606:4700:3031::6815:4dd8"
  }
}
array(5) {
  ["ai_flags"]=>
  int(0)
  ["ai_family"]=>
  int(23)
  ["ai_socktype"]=>
  int(0)
  ["ai_protocol"]=>
  int(0)
  ["ai_addr"]=>
  array(2) {
    ["sin6_port"]=>
    int(0)
    ["sin6_addr"]=>
    string(25) "2606:4700:3034::ac43:d3e7"
  }
}
array(5) {
  ["ai_flags"]=>
  int(0)
  ["ai_family"]=>
  int(2)
  ["ai_socktype"]=>
  int(0)
  ["ai_protocol"]=>
  int(0)
  ["ai_addr"]=>
  array(2) {
    ["sin_port"]=>
    int(0)
    ["sin_addr"]=>
    string(13) "104.21.77.216"
  }
}
array(5) {
  ["ai_flags"]=>
  int(0)
  ["ai_family"]=>
  int(2)
  ["ai_socktype"]=>
  int(0)
  ["ai_protocol"]=>
  int(0)
  ["ai_addr"]=>
  array(2) {
    ["sin_port"]=>
    int(0)
    ["sin_addr"]=>
    string(14) "172.67.211.231"
  }
}


*/

只查询IPV6

只需要在第三个参数hints中指定其中的类型。

$addrinfo_arr = socket_addrinfo_lookup('cloudfare.com',null,[
    'ai_family' => AF_INET6,
//    'ai_family' => AF_INET,//只取ipv4
]);

hints可配置键名

socket_addrinfo_lookup(): Argument #3 ($hints) must only contain array keys “ai_flags”, “ai_socktype”, “ai_protocol”, or “ai_family”

其中的 ai_flags 没搞明白，另外的 ai_family，ai_socktype，ai_protocol，可以对应socket_create中的三个参数domain ，type，protocol。如果定义了类型，socket_addrinfo_lookup返回的数组中地址实例内对应键值会与之对应。

ai_family

对于参数 socket_create domain, 可用 AF_INET、AF_INET6、AF_UNIX

ai_socktype

对于参数 socket_create type , 可用 SOCK_STREAM、SOCK_DGRAM、SOCK_SEQPACKET、SOCK_RAW、SOCK_RDM

ai_protocol

对于参数 socket_create protocol, 可用 getprotobyname()获取。

获取指定类型地址实例

以ipv6-icmp为例，注意返回数组中的对应类型


$addrinfo_arr = socket_addrinfo_lookup('cloudfare.com',null,array(
    'ai_family' => AF_INET6,//23
    'ai_socktype' => SOCK_RAW,//3
    'ai_protocol' => getprotobyname('ipv6-icmp'),//58
));
if(!empty($addrinfo_arr)){
    foreach ($addrinfo_arr as $addrinfo){
        $addrinfo_explain = socket_addrinfo_explain($addrinfo);
        var_dump($addrinfo_explain);

    }
}
/*
array(5) {
  ["ai_flags"]=>
  int(0)
  ["ai_family"]=>
  int(23)
  ["ai_socktype"]=>
  int(3)
  ["ai_protocol"]=>
  int(58)
  ["ai_addr"]=>
  array(2) {
    ["sin6_port"]=>
    int(0)
    ["sin6_addr"]=>
    string(25) "2606:4700:3031::6815:4dd8"
  }
}
array(5) {
  ["ai_flags"]=>
  int(0)
  ["ai_family"]=>
  int(23)
  ["ai_socktype"]=>
  int(3)
  ["ai_protocol"]=>
  int(58)
  ["ai_addr"]=>
  array(2) {
    ["sin6_port"]=>
    int(0)
    ["sin6_addr"]=>
    string(25) "2606:4700:3034::ac43:d3e7"
  }
}

*/

socket_addrinfo_connect

只有一个参数，由 socket_addrinfo_lookup()创建的对象，返回的是 Socket 实例（同socket_create 返回）。
效果类似 socket_create + socket_connect。下面以icmp为例子做对比。

icmp为例子做对比


$addrinfo_arr = socket_addrinfo_lookup('cloudfare.com',null,array(
    'ai_family' => AF_INET,
    'ai_socktype' => SOCK_RAW,
    'ai_protocol' => getprotobyname('icmp'),
));

if(!empty($addrinfo_arr)){
    foreach ($addrinfo_arr as $addrinfo){
        $addrinfo_explain = socket_addrinfo_explain($addrinfo);//不是必要的，这里只是为了打印出ip地址
      	if($sock = socket_addrinfo_connect($addrinfo)){
            ping($sock,$addrinfo_explain['ai_addr']['sin_addr'],'socket_addrinfo_connect');    
        }
    }
}



$host = gethostbyname('cloudfare.com');
$sock = socket_create(AF_INET,SOCK_RAW,getprotobyname('icmp'));
if(socket_connect($sock,$host,0)){
    ping($sock,$host,'socket_connect');
}



function ping ($sock,$host,$type){
    $ts = microtime(true);
    $package = "\x08\x00\x7d\x4b\x00\x00\x00\x00PingHost";

    socket_send($sock, $package, strLen($package), 0);
    if (socket_read($sock, 255))
        $result = microtime(true) - $ts;
    else    $result = false;
    socket_close($sock);
    echo $type.' host='.($host).' rrt='.$result.PHP_EOL;
}


/*
socket_addrinfo_connect host=172.67.211.231 rrt=0.16798496246338
socket_addrinfo_connect host=104.21.77.216 rrt=0.17752909660339
socket_connect host=172.67.211.231 rrt=0.16764783859253
*/

socket_addrinfo_bind

效果类似 socket_create + socket_bind。这里还需认识socket_addrinfo_lookup 的第二个参数，service

socket_addrinfo_lookup二个参数service

默认为null，返回的地址实例中ai_addr中的端口为0。
可以设置为数字或者字符串，比如http，端口会被设置成80。

code

server

//localhost 可替换成 127.0.0.1
$addrinfo_arr = socket_addrinfo_lookup('localhost','http',array(
    'ai_family' => AF_INET,
    'ai_socktype' => SOCK_STREAM,
    'ai_protocol' => getprotobyname('tcp'),
));
if(!empty($addrinfo_arr)){
    foreach ($addrinfo_arr as $addrinfo){
        $sock = socket_addrinfo_bind($addrinfo);
        socket_listen($sock,1);
        $clnt_sock = socket_accept($sock); //阻塞
        $st = "hello world ^_^";
        socket_write($clnt_sock, $st,strlen($st));
        socket_close($clnt_sock);
        socket_close($sock);
        break;

    }
}


// 同下面代码
$sock = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
socket_bind($sock, '127.0.0.1',80);
socket_listen($sock,1);
$clnt_sock = socket_accept($sock); //阻塞
$st = "hello world ^_^";
socket_write($clnt_sock, $st,strlen($st));
socket_close($clnt_sock);
socket_close($sock);

client

//localhost 可替换成 127.0.0.1
$addrinfo_arr = socket_addrinfo_lookup('localhost','http',array(
    'ai_family' => AF_INET,
    'ai_socktype' => SOCK_STREAM,
    'ai_protocol' => getprotobyname('tcp'),
));
if(!empty($addrinfo_arr)){
    foreach ($addrinfo_arr as $addrinfo){
        if($sock = socket_addrinfo_connect($addrinfo)){
            $ret= socket_read($sock, 1024);
            print "from simple-tcp-server:".$ret.PHP_EOL;
            socket_close($sock);
            exit;
        }
    }
}

// 同下面代码
$clnt_sock = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
socket_connect($clnt_sock, '127.0.0.1', 5000);
$ret= socket_read($clnt_sock, 1024);
print "from simple-tcp-server:".$ret.PHP_EOL;
socket_close($clnt_sock);

参考

function.socket-addrinfo-lookup.php
https://github.com/php/php-src/search?q=socket_addrinfo_lookup