ntp.c File Reference

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Detailed Description

Detection of a local NTP server.

Author:

Raphael Manfredi

Date:

2004

#include "common.h"
#include "ntp.h"
#include "settings.h"
#include "sockets.h"
#include "if/core/hosts.h"
#include "if/gnet_property.h"
#include "if/gnet_property_priv.h"
#include "lib/cq.h"
#include "lib/endian.h"
#include "lib/misc.h"
#include "lib/tm.h"
#include "lib/override.h"

Data Structures
struct	ntp_msg
	An NTP message, as described in RFC2030 (trailing auth-data ignored). More...
Defines
#define	OFFSET_1900   2208988800U
	secs between 1900 and the Epoch
#define	NTP_FP_SCALE   4294967296.0
	NTP fixed-point scaling base.
#define	NTP_WAIT_MS   (5*1000)
	Wait at most 5 secs for reply.
#define	NTP_VERSION   3
	Say we're version 3.
#define	NTP_CLIENT   3
	Mode for unicast request.
#define	NTP_SERVER   4
	Mode for server reply.
#define	NTP_AUTHSIZE   20
	Size of NTP auth, when present.
#define	NTP_MINSIZE   sizeof(struct ntp_msg)
#define	NTP_MAXSIZE   (NTP_MINSIZE + NTP_AUTHSIZE)
Functions
void	ntp_tm_serialize (guchar dest[8], tm_t *t)
	Fill 8-byte buffer with NTP's representation of a tm_t time.
void	ntp_tm_deserialize (const guchar src[8], tm_t *dest)
	Construct a tm_t time from an NTP timestamp.
void	ntp_no_reply (cqueue_t *unused_cq, gpointer unused_udata)
	Callout queue timeout when no reply is received within a reasonable timeframe.
gboolean	ntp_send_probe (const host_addr_t addr)
gboolean	ntp_send_probes (void)
void	ntp_probe (void)
	Send an NTP probe to the local host using the loopback addresses 127.0.0.1 and ::1, waiting for a reply within the next NTP_WAIT_MS ms.
void	ntp_got_reply (struct gnutella_socket *s)
	Got a reply from an NTP daemon.
void	ntp_init (void)
	Initialize the NTP monitoring.
void	ntp_close (void)
	Shutdown the NTP monitoring.
Variables
cevent_t *	wait_ev
	Callout queue waiting event.

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Define Documentation

#define NTP_AUTHSIZE   20

Size of NTP auth, when present.

#define NTP_CLIENT   3

Mode for unicast request.

#define NTP_FP_SCALE   4294967296.0

NTP fixed-point scaling base.

#define NTP_MAXSIZE   (NTP_MINSIZE + NTP_AUTHSIZE)

#define NTP_MINSIZE   sizeof(struct ntp_msg)

#define NTP_SERVER   4

Mode for server reply.

#define NTP_VERSION   3

Say we're version 3.

#define NTP_WAIT_MS   (5*1000)

Wait at most 5 secs for reply.

#define OFFSET_1900   2208988800U

secs between 1900 and the Epoch

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Function Documentation

void ntp_close (  void   )

Shutdown the NTP monitoring.

void ntp_got_reply (  struct gnutella_socket *  s  )

Got a reply from an NTP daemon.

void ntp_init (  void   )

Initialize the NTP monitoring.

void ntp_no_reply (  cqueue_t *  unused_cq, gpointer  unused_udata )  [static]

Callout queue timeout when no reply is received within a reasonable timeframe.

void ntp_probe (  void   )

Send an NTP probe to the local host using the loopback addresses 127.0.0.1 and ::1, waiting for a reply within the next NTP_WAIT_MS ms.

gboolean ntp_send_probe (  const host_addr_t  addr  )  [static]

gboolean ntp_send_probes (  void   )  [static]

void ntp_tm_deserialize (  const guchar  src[8], tm_t *  dest )  [static]

Construct a tm_t time from an NTP timestamp.

void ntp_tm_serialize (  guchar  dest[8], tm_t *  t )  [static]

Fill 8-byte buffer with NTP's representation of a tm_t time.

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Variable Documentation

cevent_t* wait_ev [static]

Callout queue waiting event.

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