//+------------------------------------------------------------------+
//| SocketTlsHandshake.mq5 |
//| Copyright 2024, MetaQuotes Ltd. |
//| https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2024, MetaQuotes Ltd."
#property link "https://www.mql5.com
#property version "1.00"
#define SERVER "smtp.gmail.com"
#define PORT 587
//+------------------------------------------------------------------+
//| 手动切换到安全连接 |
//+------------------------------------------------------------------+
bool TlsHandshake(int socket)
{
//--- 获取服务器问候语
string rsp;
if(!RecvString(socket,rsp))
return(false);
//--- 问候服务器
if(!SendString(socket,"EHLO my.domain.com\r\n"))
return(false);
//--- 获取服务器响应，其中包含支持的命令列表
if(!RecvString(socket,rsp))
return(false);
//--- 打印问候语
Print("SERVER: ",rsp);
//--- 通知服务器，我们想使用TLS从不安全连接切换到安全连接
if(!SendString(socket,"STARTTLS\r\n"))
return(false);
//--- 获取服务器响应
if(!RecvString(socket,rsp))
return(false);
//--- 在该示例中，我们不检查服务器关于切换到TLS的准备就绪（“准备启动TLS”）的响应
//--- 使用TLS握手协议启动与指定主机的安全TLS（SSL）连接
if(SocketTlsHandshake(socket,InpTimeout))
return(true);
Print("SocketTlsHandshake() failed. Error ",GetLastError());
return(false);
}
//+------------------------------------------------------------------+
//| 脚本程序起始函数 |
//+------------------------------------------------------------------+
void OnStart(void)
{
//--- 创建一个套接字并取得它的句柄
int socket=SocketCreate();
if(socket==INVALID_HANDLE)
{
Print("SocketCreate() failed. Error ",GetLastError());
return;
}
//--- 通过 PORT 端口连接到服务器 SERVER
if(!SocketConnect(socket,SERVER,PORT,10000))
{
Print("SocketConnect() failed. Error ",GetLastError());
}
else
{
//--- 建立了非安全连接
PrintFormat("%s connection has been established to %s:%d",(PORT==443 ? "A secured" : "An unsecured"),SERVER,PORT);
//--- 切换到安全连接
if(PORT!=443 && TlsHandshake(socket))
{
PrintFormat("Unsecured connection to %s:%d switched to secured",SERVER,PORT);
//--- 如果连接有证书保护, 显示它的数据
string subject,issuer,serial,thumbprint;
datetime expiration;
if(SocketTlsCertificate(socket,subject,issuer,serial,thumbprint,expiration))
{
Print("TLS certificate:");
Print(" Owner: ",subject);
Print(" Issuer: ",issuer);
Print(" Number: ",serial);
Print(" Print: ",thumbprint);
Print(" Expiration: ",expiration);
}
}
}
//--- 在使用后关闭套接字
SocketClose(socket);
/*
结果：
An unsecured connection has been established to smtp.gmail.com:587
SERVER: 220 smtp.gmail.com ESMTP a640c23a62f3a-a9b1f298319sm82305866b.105 - gsmtp
SERVER: 250-smtp.gmail.com at your service, [37.193.40.122]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-CHUNKING
250 SMTPUTF8
SERVER: 220 2.0.0 Ready to start TLS
SocketTlsHandshake(): A secure connection to smtp.gmail.com:587 is now established
TLS certificate:
Owner: /CN=smtp.gmail.com
Issuer: /C=US/O=Google Trust Services/CN=WR2
Number: 1f:f4:db:2a:5a:e6:dc:52:0a:4c:05:ce:81:cc:c3:f7
Print: d6be8af229b5329cd3d4c2789c02aa94f89b421c
Expiration: 2024.12.30 08:25:30
*/
}
//+------------------------------------------------------------------+
//| 向服务器发送字符串 |
//+------------------------------------------------------------------+
bool SendString(int socket,const string str)
{
//--- 把字符串转换成字符数组
uchar data[];
int size=StringToCharArray(str,data,0,str.Length(),CP_UTF8);
//--- 发送数据至套接字
ResetLastError();
if(SocketSend(socket,data,size)==size)
return(true);
//--- 数据发送错误
Print("Failed to send data to server. Error ",GetLastError());
return false;
}
//+------------------------------------------------------------------+
//| 从服务器获取字符串 |
//+------------------------------------------------------------------+
bool RecvString(int socket,string& result,uint timeout_ms=1000)
{
//--- 等待数据出现在套接字上
ulong wait_time_end=GetMicrosecondCount()+timeout_ms*1000;
while(!SocketIsReadable(socket))
{
Sleep(10);
//--- 等待数据超时-返回NULL作为响应
if(wait_time_end<GetMicrosecondCount())
{
Print("ERROR: No response from server");
return(false);
}
}
//--- 从套接字读取数据
uchar data[128];
uint size=0;
string resp=NULL;
do
{
uchar b[1];
int n=SocketRead(socket,b,1,1000);
if(n < 0)
break;
if(n)
{
data[size++]=b[0];
if(size==data.Size())
{
resp += CharArrayToString(data,0,data.Size(),CP_UTF8);
size = 0;
}
}
}
while(SocketIsReadable(socket));
//--- 将读取的数据复制到字符串中
if(size)
resp+=CharArrayToString(data,0,size,CP_UTF8);
//--- 如果字符串为空，则出现错误
if(!resp.Length())
{
Print("ERROR: No response from server");
return(false);
}
//--- 返回字符串
result=resp;
return(true);
}
|