smtp&pop3认证邮件发送接收

WSADATA wsa;
WSAStartup(MAKEWORD(2,2), &wsa);

SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == INVALID_SOCKET)
{
return -1;
}

struct sockaddr_in addr;
addr.sin_addr.s_addr = inet_addr(server);
addr.sin_family = AF_INET;
addr.sin_port = htons(port);

if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)))
{
closesocket(sock);
return -2;
}

// ehlo
char szBuf [SIZE_4K] = {0};
std::string request = "EHLO ";
request += server;
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);

// auth login
request = "AUTH LOGIN";
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);

// =------
request = user;
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
recv(sock, szBuf, SIZE_4K, 0);

request = pass;
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);

// mail from
request = "MAIL FROM ";
request += mailfrom;
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);

// rcpt to
request = "RCPT TO ";
request += rcptto;
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);

// data
request = "DATA";
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);
// =-----------
request = "From:";
request += mailfrom;
request += HTTP_CRLF;
request += "To:";
request += rcptto;
request += HTTP_CRLF;
request += "Subject:";
request += subject;
request += HTTP_CRLF;
request += "Cc:";
request += cc;
request += HTTP_CRLF;
request += HTTP_CRLF;
request += body;
request += HTTP_CRLF;
request += ".";
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);

// noop
request = "NOOP";
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);

// quit
request = "QUIT";
request += HTTP_CRLF;
send(sock, request.c_str(), request.length(), 0);
memset(szBuf, 0, SIZE_4K);
recv(sock, szBuf, SIZE_4K, 0);

closesocket(sock);