43 lines
1,001 B
C++
43 lines
1,001 B
C++
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#include <fc/network/ntp.hpp>
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#include <fc/network/udp_socket.hpp>
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#include <fc/network/resolve.hpp>
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#include <fc/network/ip.hpp>
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#include <array>
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namespace fc
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{
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static fc::ip::endpoint ntp_server;
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void ntp::set_server( const std::string& hostname, uint16_t port )
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{
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auto eps = resolve( hostname, port );
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if( eps.size() )
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ntp_server = eps.front();
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}
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fc::time_point ntp::get_time()
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{
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static bool init_ntp_server = [](){
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set_server( "pool.ntp.org", 123 );
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return true;
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}();
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(void)init_ntp_server;
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udp_socket sock;
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sock.open();
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std::array<unsigned char, 48> send_buf { {010,0,0,0,0,0,0,0,0} };
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sock.send_to( (const char*)send_buf.data(), send_buf.size(), ntp_server );
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fc::ip::endpoint from;
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std::array<unsigned long, 1024> recv_buf;
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sock.receive_from( (char*)recv_buf.data(), recv_buf.size(), from );
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return fc::time_point() + fc::seconds( ntohl((time_t)recv_buf[4]) - 2208988800U);
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}
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}
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