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Diffstat (limited to 'ntpdate/ntpdate.h')
| -rw-r--r-- | ntpdate/ntpdate.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/ntpdate/ntpdate.h b/ntpdate/ntpdate.h new file mode 100644 index 0000000..df9c49e --- /dev/null +++ b/ntpdate/ntpdate.h @@ -0,0 +1,108 @@ +/* + * ntpdate.h - declarations for the ntpdate and ntptimeset programs + */ + +#include "ntp_malloc.h" + +extern void loadservers (char *cfgpath); + +/* + * The server structure is a much simplified version of the + * peer structure, for ntpdate's use. Since we always send + * in client mode and expect to receive in server mode, this + * leaves only a very limited number of things we need to + * remember about the server. + */ +struct server { + struct server *next_server; /* next server in build list */ + sockaddr_u srcadr; /* address of remote host */ + u_char version; /* version to use */ + u_char leap; /* leap indicator */ + u_char stratum; /* stratum of remote server */ + s_char precision; /* server's clock precision */ + u_char trust; /* trustability of the filtered data */ + u_fp rootdelay; /* distance from primary clock */ + u_fp rootdisp; /* peer clock dispersion */ + u_int32 refid; /* peer reference ID */ + l_fp reftime; /* time of peer's last update */ + u_long event_time; /* time for next timeout */ + u_long last_xmit; /* time of last transmit */ + u_short xmtcnt; /* number of packets transmitted */ + u_short rcvcnt; /* number of packets received */ + u_char reach; /* reachability, NTP_WINDOW bits */ + u_short filter_nextpt; /* index into filter shift register */ + s_fp filter_delay[NTP_SHIFT]; /* delay part of shift register */ + l_fp filter_offset[NTP_SHIFT]; /* offset part of shift register */ + s_fp filter_soffset[NTP_SHIFT]; /* offset in s_fp format, for disp */ + u_fp filter_error[NTP_SHIFT]; /* error part of shift register */ + l_fp org; /* peer's originate time stamp */ + l_fp xmt; /* transmit time stamp */ + u_fp delay; /* filter estimated delay */ + u_fp dispersion; /* filter estimated dispersion */ + l_fp offset; /* filter estimated clock offset */ + s_fp soffset; /* fp version of above */ +}; + + +/* + * ntpdate runs everything on a simple, short timeout. It sends a + * packet and sets the timeout (by default, to a small value suitable + * for a LAN). If it receives a response it sends another request. + * If it times out it shifts zeroes into the filter and sends another + * request. + * + * The timer routine is run often (once every 1/5 second currently) + * so that time outs are done with reasonable precision. + */ +#define TIMER_HZ (5) /* 5 per second */ + +/* + * ntpdate will make a long adjustment using adjtime() if the times + * are close, or step the time if the times are farther apart. The + * following defines what is "close". + */ +#define NTPDATE_THRESHOLD (FP_SECOND >> 1) /* 1/2 second */ + +#define NTP_MAXAGE 86400 /* one day in seconds */ + +/* + * When doing adjustments, ntpdate actually overadjusts (currently + * by 50%, though this may change). While this will make it take longer + * to reach a steady state condition, it will typically result in + * the clock keeping more accurate time, on average. The amount of + * overshoot is limited. + */ +#ifdef NOTNOW +#define ADJ_OVERSHOOT 1/2 /* this is hard coded */ +#endif /* NOTNOW */ +#define ADJ_MAXOVERSHOOT 0x10000000 /* 50 ms as a ts fraction */ + +/* + * Since ntpdate isn't aware of some of the things that normally get + * put in an NTP packet, we fix some values. + */ +#define NTPDATE_PRECISION (-6) /* use this precision */ +#define NTPDATE_DISTANCE FP_SECOND /* distance is 1 sec */ +#define NTPDATE_DISP FP_SECOND /* so is the dispersion */ +#define NTPDATE_REFID (0) /* reference ID to use */ +#define PEER_MAXDISP (64*FP_SECOND) /* maximum dispersion (fp 64) */ + + +/* + * No less than 2s between requests to a server to stay within ntpd's + * default "discard minimum 1" (and 1s enforcement slop). That is + * enforced only if the nondefault limited restriction is in place, such + * as with "restrict ... limited" and "restrict ... kod limited". + */ +#define MINTIMEOUT (1 * TIMER_HZ) /* 1s min. between packets */ +#define DEFTIMEOUT (2 * TIMER_HZ) /* 2s by default */ +#define DEFSAMPLES 4 /* get 4 samples per server */ +#define DEFPRECISION (-5) /* the precision we claim */ +#define DEFMAXPERIOD 60 /* maximum time to wait */ +#define DEFMINSERVERS 3 /* minimum responding servers */ +#define DEFMINVALID 1 /* mimimum servers with valid time */ + +/* + * Define the max number of sockets we can open + */ +#define MAX_AF 2 |