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ntp: use NTP instead of echo for presend

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Switch to NTP for presend as the echo service (RFC 862) is rarely
enabled. When presend is active, send an NTP client packet to the
server/peer and ignore the reply.

This also fixes presend with separate client sockets. The destination
port can't be changed on connected sockets, so the echo packet was sent
to the NTP port instead of the echo port.
This commit is contained in:
Miroslav Lichvar
2014-08-15 15:45:48 +02:00
parent ff4abc69c3
commit cd5105b1db
4 changed files with 18 additions and 32 deletions
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17
ntp_io.c
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@@ -687,20 +687,3 @@ NIO_SendAuthenticatedPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
{
send_packet((void *) packet, NTP_NORMAL_PACKET_SIZE + auth_len, remote_addr, local_addr);
}
/* ================================================== */
/* We ought to use getservbyname, but I can't really see this changing */
#define ECHO_PORT 7
void
NIO_SendEcho(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr)
{
unsigned long magic_message = 0xbe7ab1e7UL;
NTP_Remote_Address addr;
addr = *remote_addr;
addr.port = ECHO_PORT;
send_packet((void *) &magic_message, sizeof(unsigned long), &addr, local_addr);
}