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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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24
conf.c
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@@ -69,6 +69,7 @@ static void parse_mailonchange(char *);
static void parse_makestep(char *);
static void parse_maxchange(char *);
static void parse_peer(char *);
static void parse_pool(char *);
static void parse_refclock(char *);
static void parse_server(char *);
static void parse_tempcomp(char *);
@@ -199,6 +200,7 @@ static char *user;
typedef struct {
NTP_Source_Type type;
int pool;
CPS_NTP_Source params;
} NTP_Source;
@@ -467,6 +469,8 @@ CNF_ParseLine(const char *filename, int number, char *line)
parse_peer(p);
} else if (!strcasecmp(command, "pidfile")) {
parse_string(p, &pidfile);
} else if (!strcasecmp(command, "pool")) {
parse_pool(p);
} else if (!strcasecmp(command, "port")) {
parse_int(p, &ntp_port);
} else if (!strcasecmp(command, "refclock")) {
@@ -560,12 +564,13 @@ parse_null(char *line)
/* ================================================== */
static void
parse_source(char *line, NTP_Source_Type type)
parse_source(char *line, NTP_Source_Type type, int pool)
{
CPS_Status status;
NTP_Source source;
source.type = type;
source.pool = pool;
status = CPS_ParseNTPSourceAdd(line, &source.params);
switch (status) {
@@ -620,7 +625,7 @@ parse_source(char *line, NTP_Source_Type type)
static void
parse_server(char *line)
{
parse_source(line, NTP_SERVER);
parse_source(line, NTP_SERVER, 0);
}
/* ================================================== */
@@ -628,7 +633,15 @@ parse_server(char *line)
static void
parse_peer(char *line)
{
parse_source(line, NTP_PEER);
parse_source(line, NTP_PEER, 0);
}
/* ================================================== */
static void
parse_pool(char *line)
{
parse_source(line, NTP_SERVER, 1);
}
/* ================================================== */
@@ -1207,8 +1220,9 @@ CNF_AddSources(void)
for (i = 0; i < ARR_GetSize(ntp_sources); i++) {
source = (NTP_Source *)ARR_GetElement(ntp_sources, i);
NSR_AddUnresolvedSource(source->params.name, source->params.port,
source->type, &source->params.params);
NSR_AddSourceByName(source->params.name, source->params.port,
source->pool, source->type, &source->params.params);
Free(source->params.name);
}
ARR_SetSize(ntp_sources, 0);