ntpd: implement -x. shrink code a bit. -69 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
4bd5189370
commit
907647fb15
@ -3217,9 +3217,8 @@
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"\nOptions:" \
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"\n -d Verbose" \
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"\n -n Do not daemonize" \
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"\n -g Set system time even if offset is > 1000 sec" \
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"\n -q Quit after clock is set" \
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/* -N exists for mostly compat reasons, thus Not essential to inform */ \
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/* -N exists for mostly compat reasons, thus not essential to inform */ \
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/* the user that it exists: user may use nice as well */ \
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/* "\n -N Run at high priority" */ \
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"\n -l Run as server on port 123" \
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@ -14,11 +14,14 @@
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# error "Sorry, your kernel has to support IP_PKTINFO"
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#endif
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#define INTERVAL_QUERY_NORMAL 30 /* sync to peers every n secs */
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/* Sync to peers every N secs */
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#define INTERVAL_QUERY_NORMAL 30
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#define INTERVAL_QUERY_PATHETIC 60
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#define INTERVAL_QUERY_AGRESSIVE 5
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#define TRUSTLEVEL_BADPEER 6 /* bad if *less than* TRUSTLEVEL_BADPEER */
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/* Bad if *less than* TRUSTLEVEL_BADPEER */
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#define TRUSTLEVEL_BADPEER 6
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#define TRUSTLEVEL_PATHETIC 2
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#define TRUSTLEVEL_AGRESSIVE 8
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#define TRUSTLEVEL_MAX 10
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@ -26,30 +29,11 @@
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#define QSCALE_OFF_MIN 0.05
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#define QSCALE_OFF_MAX 0.50
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#define QUERYTIME_MAX 15 /* single query might take n secs max */
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#define OFFSET_ARRAY_SIZE 8
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#define SETTIME_MIN_OFFSET 180 /* min offset for settime at start */
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#define SETTIME_TIMEOUT 15 /* max seconds to wait with -s */
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/* Single query might take n secs max */
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#define QUERYTIME_MAX 15
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/* Min offset for settime at start. "man ntpd" says it's 128 ms */
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#define STEPTIME_MIN_OFFSET 0.128
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/* Style borrowed from NTP ref/tcpdump and updated for SNTPv4 (RFC2030). */
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/*
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* RFC Section 3
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Integer Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Fraction Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Integer Part | Fraction Part |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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typedef struct {
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uint32_t int_partl;
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uint32_t fractionl;
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@ -85,7 +69,7 @@ typedef struct {
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enum {
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NTP_VERSION = 4,
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NTP_MAXSTRATUM = 15,
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/* Leap Second Codes (high order two bits) */
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/* Leap Second Codes (high order two bits of m_status) */
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LI_NOWARNING = (0 << 6), /* no warning */
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LI_PLUSSEC = (1 << 6), /* add a second (61 seconds) */
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LI_MINUSSEC = (2 << 6), /* minus a second (59 seconds) */
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@ -121,33 +105,28 @@ typedef struct {
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uint8_t o_good;
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} ntp_offset_t;
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#define OFFSET_ARRAY_SIZE 8
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typedef struct {
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//TODO: periodically re-resolve DNS names?
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len_and_sockaddr *lsa;
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char *hostname;
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char *dotted;
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double xmttime;
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time_t next;
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time_t deadline;
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/* When to send new query (if fd == -1)
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* or when receive times out (if fd >= 0): */
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time_t next_action_time;
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int fd;
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uint8_t state;
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uint8_t shift;
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uint8_t trustlevel;
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ntp_msg_t msg;
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double xmttime;
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ntp_offset_t update;
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ntp_offset_t reply[OFFSET_ARRAY_SIZE];
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} ntp_peer_t;
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/* for ntp_peer_t::state */
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enum {
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STATE_NONE,
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STATE_QUERY_SENT,
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STATE_REPLY_RECEIVED,
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};
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enum {
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OPT_n = (1 << 0),
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OPT_g = (1 << 1),
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OPT_q = (1 << 2),
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OPT_N = (1 << 3),
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OPT_q = (1 << 1),
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OPT_N = (1 << 2),
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OPT_x = (1 << 3),
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/* Insert new options above this line. */
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/* Non-compat options: */
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OPT_p = (1 << 4),
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@ -164,12 +143,13 @@ struct globals {
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#endif
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unsigned verbose;
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unsigned peer_cnt;
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unsigned scale;
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uint32_t refid;
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uint32_t refid4;
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uint32_t scale;
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uint8_t synced;
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uint8_t leap;
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int8_t precision;
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#define G_precision -6
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// int8_t precision;
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uint8_t stratum;
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uint8_t time_is_stepped;
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uint8_t first_adj_done;
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@ -183,32 +163,28 @@ static const int const_IPTOS_LOWDELAY = IPTOS_LOWDELAY;
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static void
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set_next(ntp_peer_t *p, unsigned t)
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{
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p->next = time(NULL) + t;
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p->deadline = 0;
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p->next_action_time = time(NULL) + t;
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}
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static void
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add_peers(const char *s)
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add_peers(char *s)
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{
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ntp_peer_t *p;
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p = xzalloc(sizeof(*p));
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//TODO: big ntpd uses all IPs, not just 1st, do we need to mimic that?
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p->lsa = xhost2sockaddr(s, 123);
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p->dotted = xmalloc_sockaddr2dotted_noport(&p->lsa->u.sa);
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p->hostname = s;
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p->dotted = s;
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p->fd = -1;
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p->msg.m_status = MODE_CLIENT | (NTP_VERSION << 3);
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if (STATE_NONE != 0)
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p->state = STATE_NONE;
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p->trustlevel = TRUSTLEVEL_PATHETIC;
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set_next(p, 0);
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p->next_action_time = time(NULL); /* = set_next(p, 0); */
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llist_add_to(&G.ntp_peers, p);
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G.peer_cnt++;
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}
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static double
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gettime1900fp(void)
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gettime1900d(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL); /* never fails */
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@ -268,13 +244,6 @@ d_to_sfp(double d)
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}
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#endif
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static void
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set_deadline(ntp_peer_t *p, time_t t)
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{
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p->deadline = time(NULL) + t;
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p->next = 0;
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}
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static unsigned
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error_interval(void)
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{
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@ -328,8 +297,18 @@ send_query_to_peer(ntp_peer_t *p)
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int fd, family;
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len_and_sockaddr *local_lsa;
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//TODO: big ntpd uses all IPs, not just 1st, do we need to mimic that?
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//TODO: periodically re-resolve DNS names?
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if (!p->lsa) {
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p->lsa = host2sockaddr(p->hostname, 123);
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if (!p->lsa) {
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set_next(p, INTERVAL_QUERY_PATHETIC);
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return -1;
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}
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p->dotted = xmalloc_sockaddr2dotted_noport(&p->lsa->u.sa);
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}
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family = p->lsa->u.sa.sa_family;
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//was: p->fd = xsocket(family, SOCK_DGRAM, 0);
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p->fd = fd = xsocket_type(&local_lsa, family, SOCK_DGRAM);
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/* local_lsa has "null" address and port 0 now.
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* bind() ensures we have a *particular port* selected by kernel
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@ -362,23 +341,70 @@ send_query_to_peer(ntp_peer_t *p)
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p->msg.m_xmttime.int_partl = random();
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p->msg.m_xmttime.fractionl = random();
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p->xmttime = gettime1900fp();
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p->xmttime = gettime1900d();
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if (do_sendto(p->fd, /*from:*/ NULL, /*to:*/ &p->lsa->u.sa, /*addrlen:*/ p->lsa->len,
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&p->msg, NTP_MSGSIZE_NOAUTH) == -1
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) {
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close(p->fd);
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p->fd = -1;
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set_next(p, INTERVAL_QUERY_PATHETIC);
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return -1;
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}
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if (G.verbose)
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bb_error_msg("sent query to %s", p->dotted);
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p->state = STATE_QUERY_SENT;
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set_deadline(p, QUERYTIME_MAX);
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set_next(p, QUERYTIME_MAX);
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return 0;
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}
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/* Time is stepped only once, when the first packet from a peer is received.
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*/
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static void
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step_time_once(double offset)
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{
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llist_t *item;
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struct timeval tv;
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char buf[80];
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time_t tval;
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if (G.time_is_stepped)
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goto bail;
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G.time_is_stepped = 1;
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/* if the offset is small, don't step, slew (later) */
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if (offset < STEPTIME_MIN_OFFSET && offset > -STEPTIME_MIN_OFFSET)
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goto bail;
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gettimeofday(&tv, NULL); /* never fails */
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offset += tv.tv_sec;
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offset += 1.0e-6 * tv.tv_usec;
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d_to_tv(offset, &tv);
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if (settimeofday(&tv, NULL) == -1)
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bb_perror_msg_and_die("settimeofday");
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tval = tv.tv_sec;
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strftime(buf, sizeof(buf), "%a %b %e %H:%M:%S %Z %Y", localtime(&tval));
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bb_error_msg("setting clock to %s (offset %fs)", buf, offset);
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for (item = G.ntp_peers; item != NULL; item = item->link) {
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ntp_peer_t *p = (ntp_peer_t *) item->data;
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p->next_action_time -= offset;
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}
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bail:
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if (option_mask32 & OPT_q)
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exit(0);
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}
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/* Time is periodically slewed when we collect enough
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* good data points.
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*/
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static int
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compare_offsets(const void *aa, const void *bb)
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{
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@ -388,8 +414,7 @@ compare_offsets(const void *aa, const void *bb)
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return -1;
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return ((*a)->update.o_offset > (*b)->update.o_offset);
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}
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static uint32_t
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static unsigned
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updated_scale(double offset)
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{
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if (offset < 0)
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@ -400,7 +425,6 @@ updated_scale(double offset)
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return QSCALE_OFF_MAX / QSCALE_OFF_MIN;
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return QSCALE_OFF_MAX / offset;
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}
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static void
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slew_time(void)
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{
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@ -409,7 +433,6 @@ slew_time(void)
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struct timeval tv;
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{
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len_and_sockaddr *lsa;
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ntp_peer_t **peers = xzalloc(sizeof(peers[0]) * G.peer_cnt);
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unsigned goodpeer_cnt = 0;
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unsigned middle;
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@ -418,8 +441,10 @@ slew_time(void)
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ntp_peer_t *p = (ntp_peer_t *) item->data;
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if (p->trustlevel < TRUSTLEVEL_BADPEER)
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continue;
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if (!p->update.o_good)
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if (!p->update.o_good) {
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free(peers);
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return;
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}
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peers[goodpeer_cnt++] = p;
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}
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@ -442,25 +467,28 @@ slew_time(void)
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}
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G.leap = peers[middle]->update.o_leap;
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G.refid4 = peers[middle]->update.o_refid4;
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lsa = peers[middle]->lsa;
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G.refid =
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#if ENABLE_FEATURE_IPV6
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lsa->u.sa.sa_family != AF_INET ?
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peers[middle]->lsa->u.sa.sa_family != AF_INET ?
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G.refid4 :
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#endif
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lsa->u.sin.sin_addr.s_addr;
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peers[middle]->lsa->u.sin.sin_addr.s_addr;
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free(peers);
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}
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//TODO: if (offset_median > BIG) step_time(offset_median)?
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bb_error_msg("adjusting clock by %fs, our stratum is %u", offset_median, G.stratum);
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G.scale = updated_scale(offset_median);
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bb_error_msg("adjusting clock by %fs, our stratum is %u, time scale %u",
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offset_median, G.stratum, G.scale);
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errno = 0;
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d_to_tv(offset_median, &tv);
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if (adjtime(&tv, &tv) == -1) {
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bb_perror_msg("adjtime failed"); //TODO: maybe _and_die?
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} else {
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if (adjtime(&tv, &tv) == -1)
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bb_perror_msg_and_die("adjtime failed");
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if (G.verbose >= 2)
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bb_error_msg("old adjust: %d.%06u", (int)tv.tv_sec, (unsigned)tv.tv_usec);
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if (G.first_adj_done) {
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uint8_t synced = (tv.tv_sec == 0 && tv.tv_usec == 0);
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if (synced != G.synced) {
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@ -469,11 +497,8 @@ slew_time(void)
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}
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}
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G.first_adj_done = 1;
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}
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G.reftime = gettime1900fp();
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//TODO: log if G.scale changed?
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G.scale = updated_scale(offset_median);
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G.reftime = gettime1900d();
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clear_good:
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for (item = G.ntp_peers; item != NULL; item = item->link) {
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@ -482,52 +507,6 @@ slew_time(void)
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}
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}
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static void
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step_time_once(double offset)
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{
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ntp_peer_t *p;
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llist_t *item;
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struct timeval tv;
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char buf[80];
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time_t tval;
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if (G.time_is_stepped)
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goto bail;
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G.time_is_stepped = 1;
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/* if the offset is small, don't call settimeofday */
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if (offset < SETTIME_MIN_OFFSET && offset > -SETTIME_MIN_OFFSET)
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goto bail;
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gettimeofday(&tv, NULL); /* never fails */
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offset += tv.tv_sec;
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offset += 1.0e-6 * tv.tv_usec;
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d_to_tv(offset, &tv);
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if (settimeofday(&tv, NULL) == -1) {
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bb_perror_msg("settimeofday");
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goto bail;
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}
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tval = tv.tv_sec;
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strftime(buf, sizeof(buf), "%a %b %e %H:%M:%S %Z %Y", localtime(&tval));
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// Do we want to print message below to system log when daemonized?
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bb_error_msg("setting clock to %s (offset %fs)", buf, offset);
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for (item = G.ntp_peers; item != NULL; item = item->link) {
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p = (ntp_peer_t *) item->data;
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if (p->next)
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p->next -= offset;
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if (p->deadline)
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p->deadline -= offset;
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}
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bail:
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if (option_mask32 & OPT_q)
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exit(0);
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}
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static void
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update_peer_data(ntp_peer_t *p)
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{
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@ -567,7 +546,6 @@ scale_interval(unsigned requested)
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r = (unsigned)random() % (unsigned)(MAX(5, interval / 10));
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return (interval + r);
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}
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static void
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recv_and_process_peer_pkt(ntp_peer_t *p)
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{
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@ -631,7 +609,7 @@ recv_and_process_peer_pkt(ntp_peer_t *p)
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* d = (T4 - T1) - (T3 - T2) t = ((T2 - T1) + (T3 - T4)) / 2.
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*/
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T4 = gettime1900fp();
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T4 = gettime1900d();
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T1 = p->xmttime;
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T2 = lfp_to_d(msg.m_rectime);
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T3 = lfp_to_d(msg.m_xmttime);
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@ -668,7 +646,6 @@ recv_and_process_peer_pkt(ntp_peer_t *p)
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interval = scale_interval(INTERVAL_QUERY_NORMAL);
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set_next(p, interval);
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p->state = STATE_REPLY_RECEIVED;
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/* every received reply which we do not discard increases trust */
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if (p->trustlevel < TRUSTLEVEL_MAX) {
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@ -690,7 +667,7 @@ recv_and_process_peer_pkt(ntp_peer_t *p)
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p->shift = 0;
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close_sock:
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/* We do not expect any more packets for now.
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/* We do not expect any more packets from this peer for now.
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* Closing the socket informs kernel about it.
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* We open a new socket when we send a new query.
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*/
|
||||
@ -723,10 +700,10 @@ recv_and_process_client_pkt(void /*int fd*/)
|
||||
if (size < 0) {
|
||||
if (errno == EAGAIN)
|
||||
goto bail;
|
||||
bb_perror_msg_and_die("recv_from_to");
|
||||
bb_perror_msg_and_die("recv");
|
||||
}
|
||||
addr = xmalloc_sockaddr2dotted_noport(from);
|
||||
bb_error_msg("malformed packet received from %s", addr);
|
||||
bb_error_msg("malformed packet received from %s: size %u", addr, (int)size);
|
||||
free(addr);
|
||||
goto bail;
|
||||
}
|
||||
@ -743,11 +720,11 @@ recv_and_process_client_pkt(void /*int fd*/)
|
||||
MODE_SERVER : MODE_SYM_PAS;
|
||||
msg.m_stratum = G.stratum;
|
||||
msg.m_ppoll = query_ppoll;
|
||||
msg.m_precision = G.precision;
|
||||
rectime = gettime1900fp();
|
||||
msg.m_precision = G_precision;
|
||||
rectime = gettime1900d();
|
||||
msg.m_xmttime = msg.m_rectime = d_to_lfp(rectime);
|
||||
msg.m_reftime = d_to_lfp(G.reftime);
|
||||
//msg.m_xmttime = d_to_lfp(gettime1900fp()); // = msg.m_rectime
|
||||
//msg.m_xmttime = d_to_lfp(gettime1900d()); // = msg.m_rectime
|
||||
msg.m_orgtime = query_xmttime;
|
||||
msg.m_rootdelay = d_to_sfp(G.rootdelay);
|
||||
version = (query_status & VERSION_MASK); /* ... >> VERSION_SHIFT - done below instead */
|
||||
@ -859,7 +836,6 @@ static NOINLINE void ntp_init(char **argv)
|
||||
llist_t *peers;
|
||||
|
||||
srandom(getpid());
|
||||
/* tzset(); - why? it's called automatically when needed, no? */
|
||||
|
||||
if (getuid())
|
||||
bb_error_msg_and_die(bb_msg_you_must_be_root);
|
||||
@ -867,16 +843,15 @@ static NOINLINE void ntp_init(char **argv)
|
||||
peers = NULL;
|
||||
opt_complementary = "dd:p::"; /* d: counter, p: list */
|
||||
opts = getopt32(argv,
|
||||
"ngqN" /* compat */
|
||||
"nqNx" /* compat */
|
||||
"p:"IF_FEATURE_NTPD_SERVER("l") /* NOT compat */
|
||||
"d" /* compat */
|
||||
"46aAbLx", /* compat, ignored */
|
||||
"46aAbgL", /* compat, ignored */
|
||||
&peers, &G.verbose);
|
||||
if (!(opts & (OPT_p|OPT_l)))
|
||||
bb_show_usage();
|
||||
//WRONG
|
||||
// if (opts & OPT_g)
|
||||
// G.time_is_stepped = 1;
|
||||
if (opts & OPT_x) /* disable stepping, only slew is allowed */
|
||||
G.time_is_stepped = 1;
|
||||
while (peers)
|
||||
add_peers(llist_pop(&peers));
|
||||
if (!(opts & OPT_n)) {
|
||||
@ -896,23 +871,28 @@ static NOINLINE void ntp_init(char **argv)
|
||||
setpriority(PRIO_PROCESS, 0, -15);
|
||||
|
||||
/* Set some globals */
|
||||
#if 0
|
||||
/* With constant b = 100, G.precision is also constant -6.
|
||||
* Uncomment this and you'll see */
|
||||
{
|
||||
int prec = 0;
|
||||
int b;
|
||||
#if 0
|
||||
# if 0
|
||||
struct timespec tp;
|
||||
/* We can use sys_clock_getres but assuming 10ms tick should be fine */
|
||||
clock_getres(CLOCK_REALTIME, &tp);
|
||||
tp.tv_sec = 0;
|
||||
tp.tv_nsec = 10000000;
|
||||
b = 1000000000 / tp.tv_nsec; /* convert to Hz */
|
||||
#else
|
||||
# else
|
||||
b = 100; /* b = 1000000000/10000000 = 100 */
|
||||
#endif
|
||||
# endif
|
||||
while (b > 1)
|
||||
prec--, b >>= 1;
|
||||
G.precision = prec;
|
||||
//G.precision = prec;
|
||||
bb_error_msg("G.precision:%d", prec); /* -6 */
|
||||
}
|
||||
#endif
|
||||
G.scale = 1;
|
||||
|
||||
bb_signals((1 << SIGTERM) | (1 << SIGINT), record_signo);
|
||||
@ -963,14 +943,17 @@ int ntpd_main(int argc UNUSED_PARAM, char **argv)
|
||||
for (item = g.ntp_peers; item != NULL; item = item->link) {
|
||||
ntp_peer_t *p = (ntp_peer_t *) item->data;
|
||||
|
||||
if (p->next != 0 && p->next <= cur_time) {
|
||||
/* Overflow-safe "if (p->next_action_time <= cur_time) ..." */
|
||||
if ((int)(cur_time - p->next_action_time) >= 0) {
|
||||
if (p->fd == -1) {
|
||||
/* Time to send new req */
|
||||
trial_cnt++;
|
||||
if (send_query_to_peer(p) == 0)
|
||||
sent_cnt++;
|
||||
}
|
||||
if (p->deadline != 0 && p->deadline <= cur_time) {
|
||||
} else {
|
||||
/* Timed out waiting for reply */
|
||||
close(p->fd);
|
||||
p->fd = -1;
|
||||
timeout = error_interval();
|
||||
bb_error_msg("timed out waiting for %s, "
|
||||
"next query in %us", p->dotted, timeout);
|
||||
@ -981,13 +964,12 @@ int ntpd_main(int argc UNUSED_PARAM, char **argv)
|
||||
}
|
||||
set_next(p, timeout);
|
||||
}
|
||||
}
|
||||
|
||||
if (p->next != 0 && p->next < nextaction)
|
||||
nextaction = p->next;
|
||||
if (p->deadline != 0 && p->deadline < nextaction)
|
||||
nextaction = p->deadline;
|
||||
if (p->next_action_time < nextaction)
|
||||
nextaction = p->next_action_time;
|
||||
|
||||
if (p->state == STATE_QUERY_SENT) {
|
||||
if (p->fd >= 0) {
|
||||
/* Wait for reply from this peer */
|
||||
pfd[i].fd = p->fd;
|
||||
pfd[i].events = POLLIN;
|
||||
@ -1005,7 +987,7 @@ int ntpd_main(int argc UNUSED_PARAM, char **argv)
|
||||
|
||||
/* Here we may block */
|
||||
if (g.verbose >= 2)
|
||||
bb_error_msg("poll %u sec, sockets:%u", timeout, i);
|
||||
bb_error_msg("poll %us, sockets:%u", timeout, i);
|
||||
nfds = poll(pfd, i, timeout * 1000);
|
||||
if (nfds <= 0)
|
||||
continue;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user