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ntp: check remote interval in client mode

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For testA in the client mode require also that the time the server
needed to process the client request is not longer than 4 seconds.
With maximum peer delay this limits the interval in which the client can
accept a server reply.
This commit is contained in:
Miroslav Lichvar 2015-11-04 15:47:40 +01:00
parent 66d534417b
commit df9b5d8c22
1 changed files with 7 additions and 3 deletions
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10
ntp_core.c
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@ -215,6 +215,9 @@ static ARR_Instance broadcasts;
/* Invalid stratum number */ /* Invalid stratum number */
#define NTP_INVALID_STRATUM 0 #define NTP_INVALID_STRATUM 0
/* Maximum allowed time for server to process client packet */
#define MAX_SERVER_INTERVAL 4.0
/* Minimum and maximum allowed poll interval */ /* Minimum and maximum allowed poll interval */
#define MIN_POLL 0 #define MIN_POLL 0
#define MAX_POLL 24 #define MAX_POLL 24
@ -1265,9 +1268,10 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
/* Additional tests required to pass before accumulating the sample */ /* Additional tests required to pass before accumulating the sample */
/* Test A requires that the round trip delay is less than an /* Test A requires that the peer delay is not larger than the configured
administrator-defined value */ maximum and in client mode also that the server processing time is sane */
testA = delay <= inst->max_delay; testA = delay <= inst->max_delay &&
(inst->mode != MODE_CLIENT || remote_interval <= MAX_SERVER_INTERVAL);
/* Test B requires that the ratio of the round trip delay to the /* Test B requires that the ratio of the round trip delay to the
minimum one currently in the stats data register is less than an minimum one currently in the stats data register is less than an