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ntp: support pools

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The pool directive can be used to configure chronyd for a pool of NTP
servers (e.g. pool.ntp.org). The name is expected to resolve to multiple
addresses which change over time.

On start, a source will be added for each resolved address. When a
source from the pool is unreachable or marked as falseticker, chronyd
will try to replace the source with a newly resolved address of the
pool.

The minimum interval between replacements is currently set to 244
seconds to avoid frequent DNS requests.
This commit is contained in:
Miroslav Lichvar
2014-11-03 11:16:13 +01:00
parent 29c1df4610
commit c743ecbf50
6 changed files with 242 additions and 40 deletions
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11
ntp_sources.h
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@@ -50,10 +50,10 @@ typedef enum {
/* Procedure to add a new server or peer source. */
extern NSR_Status NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params);
/* Procedure to add a new server or peer source with currently unknown address.
The name will be periodically resolved in exponentially increasing intervals
until it succeeds or fails with a non-temporary error. */
extern void NSR_AddUnresolvedSource(char *name, int port, NTP_Source_Type type, SourceParameters *params);
/* Procedure to add a new server, peer source, or pool of servers specified by
name instead of address. The name is resolved in exponentially increasing
intervals until it succeeds or fails with a non-temporary error. */
extern void NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, SourceParameters *params);
/* Function type for handlers to be called back when an attempt
* (possibly unsuccessful) to resolve unresolved sources ends */
@@ -77,6 +77,9 @@ extern NSR_Status NSR_RemoveSource(NTP_Remote_Address *remote_addr);
/* Procedure to remove all sources */
extern void NSR_RemoveAllSources(void);
/* Procedure to try to find a replacement for a bad source */
extern void NSR_HandleBadSource(IPAddr *address);
/* This routine is called by ntp_io when a new packet arrives off the network */
extern void NSR_ProcessReceive(NTP_Packet *message, struct timeval *now, double now_err, NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr, int length);