[Bug] v1.2.4-beta.3回落启用PROXY protocol后程序崩溃

[xiya233]

Describe the bug【描述 bug】

nginx前置，使用ngx_stream_ssl_preread模块做sni分流，verysimple后置回落到nginx的站点，当verysimple回落启用xver =1或者xver =2后程序崩溃退出。

To Reproduce【如何复现该bug】

verysimple回落启用xver=1或者2，nginx配置接收proxy_protocol，之后用浏览器访问回落站点触发bug。

Expected behavior【预期的行为】

测试旧版本v1.2.4-beta.2是正常的。

Envs (please complete the following information):【系统环境】

Debian11

Config file 【配置文件，客户端服务端配置都提供】

verysimple服务端配置：

[[listen]]
protocol = "vlesss"
version = -1
uuid = ""
ip = "127.0.0.1"
host = "vlesss.example.com"
port = 62000
sniffing.enabled = true
cert = "vlesss.example.com.pem"
key = "vlesss.example.com.key"
insecure = false
extra = { tls_minVersion = "1.2" } 
xver = 2
fullcone = true

[[fallback]]
dest = 62001
xver = 2

[[dial]]
protocol = "direct"
fullcone = true

nginx.conf：

stream {
        map $ssl_preread_server_name $verysimple {
                vlesss.example.com vlesss;
        }
        upstream vlesss {
                server 127.0.0.1:62000;
        }
        server {
                listen 443      reuseport;
                listen [::]:443 reuseport;
                proxy_pass      $verysimple;
                ssl_preread     on;
                proxy_protocol  on;
        }
}

nginx回落站点的配置：

server {
        listen 80;
        server_name vlesss.example.com;
        if ($host = vlesss.example.com) {
                return 301 https://$host$request_uri;
        }
        return 404;
}

server {
        listen 127.0.0.1:62001 proxy_protocol;
        set_real_ip_from 127.0.0.1;
        real_ip_header proxy_protocol;
        server_name vlesss.example.com;
        index index.html;
        root /var/www/html;
}

Debug Log 【Debug日志, 客户端 和 服务端 的 日志 都提供】

服务端崩溃日志：

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x86e31b]

goroutine 11 [running]:
github.com/e1732a364fed/v2ray_simple/netLayer.WritePROXYprotocol(0x2, {0x7ff60dd75598, 0xc00020fba0}, {0x0, 0x0})
        github.com/e1732a364fed/v2ray_simple/netLayer/proxyProtocol.go:69 +0x49b
github.com/e1732a364fed/v2ray_simple.dialClient({0x34cbf, {0xcb4d08, 0xc000219730}, {0xcb3130, 0xc00020fba0}, {0xcb6b18, 0xc00023c1e0}, {0xcb7980, 0xc0000e82a0}, 0x0, ...}, ...)
        github.com/e1732a364fed/v2ray_simple/main.go:1124 +0x132d
github.com/e1732a364fed/v2ray_simple.dialClient_andRelay({0x34cbf, {0xcb4d08, 0xc000219730}, {0xcb3130, 0xc00020fba0}, {0xcb6b18, 0xc00023c1e0}, {0xcb7980, 0xc0000e82a0}, 0x0, ...}, ...)
        github.com/e1732a364fed/v2ray_simple/main.go:1426 +0x2d7
github.com/e1732a364fed/v2ray_simple.passToOutClient({0x34cbf, {0xcb4d08, 0xc000219730}, {0xcb3130, 0xc00020fba0}, {0xcb6b18, 0xc00023c1e0}, {0xcb7980, 0xc0000e82a0}, 0x0, ...}, ...)
        github.com/e1732a364fed/v2ray_simple/main.go:944 +0x29e9
github.com/e1732a364fed/v2ray_simple.handshakeInserver_and_passToOutClient({0x34cbf, {0xcb4d08, 0xc000219730}, {0xcb3130, 0xc00020fba0}, {0xcb6b18, 0xc00023c1e0}, {0xcb7980, 0xc0000e82a0}, 0x0, ...})
        github.com/e1732a364fed/v2ray_simple/main.go:526 +0x1eb
github.com/e1732a364fed/v2ray_simple.handleNewIncomeConnection({0xcb6b18, 0xc00023c1e0}, {0xcb7980, 0xc0000e82a0}, {0xcb4d08, 0xc000219730}, 0x1100bc0)
        github.com/e1732a364fed/v2ray_simple/main.go:371 +0x1498
github.com/e1732a364fed/v2ray_simple.ListenSer.func2({0xcb4d08?, 0xc000219730?})
        github.com/e1732a364fed/v2ray_simple/main.go:141 +0x45
created by github.com/e1732a364fed/v2ray_simple/netLayer.loopAccept
        github.com/e1732a364fed/v2ray_simple/netLayer/listen.go:63 +0x2cd

[e1732a364fed]

收到。

[e1732a364fed]

新的beta版本应该修复了该问题, 见 89e70ed