php ipv6 ping 笔记[B君笔记][博客]

noscript{position: fixed}php ipv6 ping 笔记ipv6pingicmpphpscoket创建时间：2022-08-28 02:14:44

主要不同

socket_create

// ipv4
 $this->sock['ipv4'] = socket_create(AF_INET, SOCK_RAW, getprotobyname('icmp'));

// ipv6
 $this->sock['ipv6'] = socket_create(AF_INET6, SOCK_RAW, getprotobyname('ipv6-icmp'));

协议中的类型不同


$packet = '';
//ipv4
 $packet .= chr(8); // type = 8 : request ; type = 0 : reply

//ipv6
 $packet .= chr(128); // type = 128: ICMPv6 Echo request; type = 129 ICMPv6 Echo Reply

在php中返回数据不同

这里这的不是 type = 0 和 129 的区别，具体如下：


//ipv4
69 0 0 60 244 129 0 0 64 1 0 0 127 0 0 1 127 0 0 1 
0 0 245 21 10 233 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

//ipv6
129 0 30 243 186 85 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

这里可能是php的问题，ipv4的数据包会把整个ip包(包括头部)返回给你。而在ipv6中，只会返回ip包的数据部分。

遇到的一些错误

正确的是 AF_INET6 + ipv6-icmp + type=128
以下是遇到的情况，如果用 ip4的包数据发给ipv6地址，会得到各种错误：

设置了AF_INET6，icmp，type=8

发包是个发给ipv6地址的的icmp包

Internet Control Message Protocol
    Type: 8 (Echo (ping) request)
    Code: 0
    Checksum: 0x1c37 [correct]
    [Checksum Status: Good]
    Identifier (BE): 56264 (0xdbc8)
    Identifier (LE): 51419 (0xc8db)
    Sequence Number (BE): 0 (0x0000)
    Sequence Number (LE): 0 (0x0000)
    [No response seen]
        [Expert Info (Warning/Sequence): No response seen to ICMP request]
    Data (32 bytes)

收包是收到一个icmpv6的错误包

Internet Control Message Protocol v6
Type: Parameter Problem (4)
Code: 1 (unrecognized Next Header type encountered)
Checksum: 0x4f57 [correct]
[Checksum Status: Good]
Pointer: 6
Internet Protocol Version 6, Src: 240e:62:9cb3:6a00:512d:ee56:2dda:e1ab, Dst: 240e:62:9cb3:6a00::1
Internet Control Message Protocol
    Type: 8 (Echo (ping) request)
    Code: 0
    Checksum: 0x1c37 [unverified] [in ICMP error packet]
    [Checksum Status: Unverified]
    Identifier (BE): 56264 (0xdbc8)
    Identifier (LE): 51419 (0xc8db)
    Sequence Number (BE): 0 (0x0000)
    Sequence Number (LE): 0 (0x0000)
    Data (32 bytes)

设置了AF_INET6，ipv6-icmp，type=8
程序会报错，提示如下

PHP Warning: socket_sendto(): Unable to write to socket [10013]: 以一种访问权限不允许的方式做了一个访问套接字的尝试。

（之前以为这是个权限问题，现在看应该是数据格式错误导致的。或者说只有高权限才可以自定义数据包）
强行用管理员权限发，从数据抓包看是得到了一个，未知数据包，并且没有响应

Internet Control Message Protocol v6
    Type: Unknown (8)
    Code: 0
    Checksum: 0x8f4a [correct]
    [Checksum Status: Good]
    [Expert Info (Note/Undecoded): Dissector for ICMPv6 Type (8) code not implemented, Contact Wireshark 			developers if you want this supported]
        [Dissector for ICMPv6 Type (8) code not implemented, Contact Wireshark developers if you want this 	supported]
        [Severity level: Note]
        [Group: Undecoded]
    Data: c2fe00010000000000000000000000000000000000000000000000000000000000000000

其他发现

在sendto 中，ipv6地址兼容问题
```
$ip = 'ff02::1';
//$ip = '['.$ip.']';
socket_sendto($this->sock['ipv6'], $packet, strlen($packet), 0, $ip, $port);
```
php 7.0 不能加[]，加了会报错

PHP Warning: socket_sendto(): Host lookup failed [-1000]: Unknown host

php 8.0.6 中加[]，也可以运行。

参考

Internet Control Message Protocol for IPv6