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- /*
- * Copyright 2015 Dius Computing Pty Ltd. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the
- * distribution.
- * - Neither the name of the copyright holders nor the names of
- * its contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * @author Johny Mattsson <jmattsson@dius.com.au>
- */
- // Module for Simple Network Time Protocol (SNTP)
- #include "module.h"
- #include "lauxlib.h"
- #include "os_type.h"
- #include "osapi.h"
- #include "lwip/udp.h"
- #include <stdlib.h>
- #include "lwip/inet.h"
- #include "lwip/dhcp.h"
- #include "user_modules.h"
- #include "lwip/dns.h"
- #include "task/task.h"
- #include "user_interface.h"
- #ifdef LUA_USE_MODULES_RTCTIME
- #include "rtc/rtctime.h"
- #endif
- struct netif * eagle_lwip_getif(uint8 index);
- #define max(a,b) ((a < b) ? b : a)
- #define NTP_PORT 123
- #define NTP_ANYCAST_ADDR(dst) IP4_ADDR(dst, 224, 0, 1, 1)
- #define MAX_ATTEMPTS 5
- #if 0
- # define sntp_dbg(...) dbg_printf(__VA_ARGS__)
- #else
- # define sntp_dbg(...)
- #endif
- //#define US_TO_FRAC(us) ((((uint64_t) (us)) << 32) / 1000000)
- #define US_TO_FRAC(us) (div1m(((uint64_t) (us)) << 32))
- #define SUS_TO_FRAC(us) ((((int64_t) (us)) << 32) / 1000000)
- //#define US_TO_FRAC16(us) ((((uint64_t) (us)) << 16) / 1000000)
- #define FRAC16_TO_US(frac) ((((uint64_t) (frac)) * 1000000) >> 16)
- typedef enum {
- NTP_NO_ERR = 0,
- NTP_DNS_ERR,
- NTP_MEM_ERR,
- NTP_SEND_ERR,
- NTP_TIMEOUT_ERR,
- NTP_MAX_ERR_ID // must be last
- } ntp_err_t;
- typedef struct
- {
- uint32_t sec;
- uint32_t frac;
- } ntp_timestamp_t;
- typedef struct
- {
- uint8_t mode : 3;
- uint8_t ver : 3;
- uint8_t LI : 2;
- uint8_t stratum;
- uint8_t poll;
- uint8_t precision;
- uint32_t root_delay;
- uint32_t root_dispersion;
- uint32_t refid;
- ntp_timestamp_t ref;
- ntp_timestamp_t origin;
- ntp_timestamp_t recv;
- ntp_timestamp_t xmit;
- } ntp_frame_t;
- typedef struct
- {
- struct udp_pcb *pcb;
- ntp_timestamp_t cookie;
- os_timer_t timer;
- int sync_cb_ref;
- int err_cb_ref;
- uint8_t attempts; // Number of repeats of each entry
- uint8_t server_index; // index into server table
- uint8_t lookup_pos;
- bool is_on_timeout;
- uint32_t kodbits; // Only for up to 32 servers (more than enough)
- int16_t server_pos;
- int16_t last_server_pos;
- int list_ref;
- struct {
- uint32_t delay_frac;
- uint32_t root_maxerr;
- uint32_t root_delay;
- uint32_t root_dispersion;
- uint16_t server_pos;
- uint8_t LI;
- uint8_t stratum;
- uint32_t delay;
- int when;
- int64_t delta;
- ip_addr_t server;
- } best;
- } sntp_state_t;
- typedef struct {
- int32_t sync_cb_ref;
- int32_t err_cb_ref;
- int32_t list_ref;
- os_timer_t timer;
- } sntp_repeat_t;
- static sntp_state_t *state;
- static sntp_repeat_t *repeat;
- static ip_addr_t *serverp;
- static uint8_t server_count;
- static uint8_t using_offset;
- static uint8_t the_offset;
- static uint8_t pending_LI;
- static int32_t next_midnight;
- static uint64_t pll_increment;
- #define PLL_A (1 << (32 - 11))
- #define PLL_B (1 << (32 - 11 - 2))
- static void on_timeout(void *arg);
- static void on_long_timeout(void *arg);
- static void sntp_dolookups(lua_State *L);
- // Value passed:
- // ntp_err_t or char pointer
- #define SNTP_HANDLE_RESULT_ID 20
- #define SNTP_DOLOOKUPS_ID 21
- static task_handle_t tasknumber;
- static uint64_t div1m(uint64_t n) {
- uint64_t q1 = (n >> 5) + (n >> 10);
- uint64_t q2 = (n >> 12) + (q1 >> 1);
- uint64_t q3 = (q2 >> 11) - (q2 >> 23);
- uint64_t q = n + q1 + q2 - q3;
- q = q >> 20;
- // Ignore the error term -- it is measured in pico seconds
- return q;
- }
- static void cleanup (lua_State *L)
- {
- os_timer_disarm (&state->timer);
- udp_remove (state->pcb);
- luaL_unref (L, LUA_REGISTRYINDEX, state->sync_cb_ref);
- luaL_unref (L, LUA_REGISTRYINDEX, state->err_cb_ref);
- luaL_unref (L, LUA_REGISTRYINDEX, state->list_ref);
- free (state);
- state = 0;
- }
- static ip_addr_t* get_free_server() {
- ip_addr_t* temp = (ip_addr_t *) malloc((server_count + 1) * sizeof(ip_addr_t));
- if (server_count > 0) {
- memcpy(temp, serverp, server_count * sizeof(ip_addr_t));
- }
- if (serverp) {
- free(serverp);
- }
- serverp = temp;
- return serverp + server_count;
- }
- static void handle_error (lua_State *L, ntp_err_t err, const char *msg)
- {
- sntp_dbg("sntp: handle_error\n");
- if (state->err_cb_ref != LUA_NOREF && state->err_cb_ref != LUA_REFNIL)
- {
- lua_rawgeti (L, LUA_REGISTRYINDEX, state->err_cb_ref);
- lua_pushinteger (L, err);
- lua_pushstring (L, msg);
- cleanup (L);
- luaL_pcallx (L, 2, 0);
- }
- else
- cleanup (L);
- }
- #ifdef LUA_USE_MODULES_RTCTIME
- static void get_zero_base_timeofday(struct rtc_timeval *tv) {
- uint32_t now = system_get_time();
- tv->tv_sec = now / 1000000;
- tv->tv_usec = now % 1000000;
- }
- #endif
- static void sntp_handle_result(lua_State *L) {
- const uint32_t MICROSECONDS = 1000000;
- if (state->best.stratum == 0) {
- // This could be because none of the servers are reachable, or maybe we haven't been able to look
- // them up.
- server_count = 0; // Reset for next time.
- handle_error(L, NTP_TIMEOUT_ERR, NULL);
- return;
- }
- bool have_cb = (state->sync_cb_ref != LUA_NOREF && state->sync_cb_ref != LUA_REFNIL);
- state->last_server_pos = state->best.server_pos; // Remember for next time
- // if we have rtctime, do higher resolution delta calc, else just use
- // the transmit timestamp
- #ifdef LUA_USE_MODULES_RTCTIME
- struct rtc_timeval tv;
- rtctime_gettimeofday (&tv);
- if (tv.tv_sec == 0) {
- get_zero_base_timeofday(&tv);
- }
- tv.tv_sec += (int)(state->best.delta >> 32);
- tv.tv_usec += (int) ((MICROSECONDS * (state->best.delta & 0xffffffff)) >> 32);
- while (tv.tv_usec >= 1000000) {
- tv.tv_usec -= 1000000;
- tv.tv_sec++;
- }
- if (state->is_on_timeout && state->best.delta > SUS_TO_FRAC(-200000) && state->best.delta < SUS_TO_FRAC(200000)) {
- // Adjust rate
- // f is frequency -- f should be 1 << 32 for nominal
- sntp_dbg("delta=%d, increment=%d, ", (int32_t) state->best.delta, (int32_t) pll_increment);
- int64_t f = ((state->best.delta * PLL_A) >> 32) + pll_increment;
- pll_increment += (state->best.delta * PLL_B) >> 32;
- sntp_dbg("f=%d, increment=%d\n", (int32_t) f, (int32_t) pll_increment);
- rtctime_adjust_rate((int32_t) f);
- } else {
- rtctime_settimeofday (&tv);
- }
- #endif
- if (have_cb)
- {
- lua_rawgeti(L, LUA_REGISTRYINDEX, state->sync_cb_ref);
- #ifdef LUA_USE_MODULES_RTCTIME
- lua_pushnumber(L, tv.tv_sec);
- lua_pushnumber(L, tv.tv_usec);
- lua_pushstring(L, ipaddr_ntoa (&state->best.server));
- lua_newtable(L);
- int d40 = state->best.delta >> 40;
- if (d40 != 0 && d40 != -1) {
- lua_pushnumber(L, state->best.delta >> 32);
- lua_setfield(L, -2, "offset_s");
- } else {
- lua_pushnumber(L, (state->best.delta * MICROSECONDS) >> 32);
- lua_setfield(L, -2, "offset_us");
- }
- #else
- int adjust_us = system_get_time() - state->best.when;
- int tv_sec = state->best.delta >> 32;
- int tv_usec = (int) (((state->best.delta & 0xffffffff) * MICROSECONDS) >> 32) + adjust_us;
- while (tv_usec >= 1000000) {
- tv_usec -= 1000000;
- tv_sec++;
- }
- lua_pushnumber(L, tv_sec);
- lua_pushnumber(L, tv_usec);
- lua_pushstring(L, ipaddr_ntoa (&state->best.server));
- lua_newtable(L);
- #endif
- if (state->best.delay_frac > 0) {
- lua_pushnumber(L, FRAC16_TO_US(state->best.delay_frac));
- lua_setfield(L, -2, "delay_us");
- }
- lua_pushnumber(L, FRAC16_TO_US(state->best.root_delay));
- lua_setfield(L, -2, "root_delay_us");
- lua_pushnumber(L, FRAC16_TO_US(state->best.root_dispersion));
- lua_setfield(L, -2, "root_dispersion_us");
- lua_pushnumber(L, FRAC16_TO_US(state->best.root_maxerr + state->best.delay_frac / 2));
- lua_setfield(L, -2, "root_maxerr_us");
- lua_pushnumber(L, state->best.stratum);
- lua_setfield(L, -2, "stratum");
- lua_pushnumber(L, state->best.LI);
- lua_setfield(L, -2, "leap");
- lua_pushnumber(L, pending_LI);
- lua_setfield(L, -2, "pending_leap");
- }
- cleanup (L);
- if (have_cb)
- {
- luaL_pcallx (L, 4, 0);
- }
- }
- #include "pm/swtimer.h"
- static void sntp_dosend ()
- {
- do {
- if (state->server_pos < 0) {
- os_timer_disarm(&state->timer);
- os_timer_setfn(&state->timer, on_timeout, NULL);
- SWTIMER_REG_CB(on_timeout, SWTIMER_RESUME);
- //The function on_timeout calls this function(sntp_dosend) again to handle time sync timeout.
- //My guess: Since the WiFi connection is restored after waking from light sleep, it would be possible to contact the SNTP server, So why not let it
- state->server_pos = 0;
- } else {
- ++state->server_pos;
- }
- if (state->server_pos >= server_count) {
- state->server_pos = 0;
- ++state->attempts;
- }
- if (state->attempts >= MAX_ATTEMPTS || state->attempts * server_count >= 8) {
- task_post_high(tasknumber, SNTP_HANDLE_RESULT_ID);
- return;
- }
- } while (serverp[state->server_pos].addr == 0 || (state->kodbits & (1 << state->server_pos)));
- sntp_dbg("sntp: server %s (%d), attempt %d\n", ipaddr_ntoa(serverp + state->server_pos), state->server_pos, state->attempts);
- struct pbuf *p = pbuf_alloc (PBUF_TRANSPORT, sizeof (ntp_frame_t), PBUF_RAM);
- if (!p) {
- task_post_low(tasknumber, NTP_MEM_ERR);
- return;
- }
- ntp_frame_t req;
- os_memset (&req, 0, sizeof (req));
- req.ver = 4;
- req.mode = 3; // client
- #ifdef LUA_USE_MODULES_RTCTIME
- const uint32_t NTP_TO_UNIX_EPOCH = 2208988800ul;
- struct rtc_timeval tv;
- rtctime_gettimeofday (&tv);
- if (tv.tv_sec == 0) {
- get_zero_base_timeofday(&tv);
- }
- req.xmit.sec = htonl (tv.tv_sec - the_offset + NTP_TO_UNIX_EPOCH);
- req.xmit.frac = htonl (US_TO_FRAC(tv.tv_usec));
- #else
- req.xmit.frac = htonl (system_get_time ());
- #endif
- state->cookie = req.xmit;
- os_memcpy (p->payload, &req, sizeof (req));
- int ret = udp_sendto (state->pcb, p, serverp + state->server_pos, NTP_PORT);
- sntp_dbg("sntp: send: %d\n", ret);
- pbuf_free (p);
- // Ignore send errors -- let the timeout handle it
- os_timer_arm (&state->timer, 1000, 0);
- }
- static void sntp_dns_found(const char *name, ip_addr_t *ipaddr, void *arg)
- {
- (void)arg;
- if (ipaddr == NULL)
- {
- sntp_dbg("DNS Fail!\n");
- }
- else
- {
- serverp[server_count] = *ipaddr;
- server_count++;
- }
- task_post_low(tasknumber, SNTP_DOLOOKUPS_ID);
- }
- static void on_timeout (void *arg)
- {
- (void)arg;
- sntp_dbg("sntp: timer\n");
- sntp_dosend ();
- }
- static int32_t get_next_midnight(int32_t now) {
- return now + 86400 - the_offset - (now - the_offset) % 86400;
- }
- static void update_offset()
- {
- // This may insert or remove an offset second -- i.e. a leap second
- // This can only happen if it is at midnight UTC.
- #ifdef LUA_USE_MODULES_RTCTIME
- struct rtc_timeval tv;
- if (pending_LI && using_offset) {
- rtctime_gettimeofday (&tv);
- sntp_dbg("Now=%d, next=%d\n", tv.tv_sec - the_offset, next_midnight);
- if (next_midnight < 100000) {
- next_midnight = get_next_midnight(tv.tv_sec);
- } else if (tv.tv_sec - the_offset >= next_midnight) {
- next_midnight = get_next_midnight(tv.tv_sec);
- // is this the first day of the month
- // Number of days since 1/mar/0000
- // 1970 * 365 is the number of days in full years
- // 1970 / 4 is the number of leap days (ignoring century rules)
- // 19 is the number of centuries
- // 4 is the number of 400 years (where there was a leap day)
- // 31 & 28 are the number of days in Jan 1970 and Feb 1970
- int day = (tv.tv_sec - the_offset) / 86400 + 1970 * 365 + 1970 / 4 - 19 + 4 - 31 - 28;
- int century = (4 * day + 3) / 146097;
- day = day - century * 146097 / 4;
- int year = (4 * day + 3) / 1461;
- day = day - year * 1461 / 4;
- int month = (5 * day + 2) / 153;
- day = day - (153 * month + 2) / 5;
- // Months 13 & 14 are really Jan and Feb in the following year.
- sntp_dbg("century=%d, year=%d, month=%d, day=%d\n", century, year, month + 3, day + 1);
- if (day == 0) {
- if (pending_LI == 1) {
- the_offset ++;
- } else {
- the_offset --;
- }
- }
- pending_LI = 0;
- }
- }
- #endif
- }
- static void record_result(int server_pos, ip_addr_t *addr, int64_t delta, int stratum, int LI, uint32_t delay_frac, uint32_t root_maxerr, uint32_t root_dispersion, uint32_t root_delay) {
- sntp_dbg("Recording %s: delta=%08x.%08x, stratum=%d, li=%d, delay=%dus, root_maxerr=%dus",
- ipaddr_ntoa(addr), (uint32_t) (delta >> 32), (uint32_t) (delta & 0xffffffff), stratum, LI, (int32_t) FRAC16_TO_US(delay_frac), (int32_t) FRAC16_TO_US(root_maxerr));
- // I want to favor close by servers as they probably have a more consistent clock,
- int delay = root_delay * 2 + delay_frac;
- if (state->last_server_pos == server_pos) {
- delay -= delay >> 2; // 25% bonus to last best server
- }
- if (!state->best.stratum || delay < state->best.delay) {
- sntp_dbg(" --BEST\n");
- state->best.server = *addr;
- state->best.server_pos = server_pos;
- state->best.delay = delay;
- state->best.delay_frac = delay_frac;
- state->best.root_maxerr = root_maxerr;
- state->best.root_dispersion = root_dispersion;
- state->best.root_delay = root_delay;
- state->best.delta = delta;
- state->best.stratum = stratum;
- state->best.LI = LI;
- state->best.when = system_get_time();
- } else {
- sntp_dbg("\n");
- }
- }
- static void on_recv (void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, uint16_t port)
- {
- (void)port;
- #ifdef LUA_USE_MODULES_RTCTIME
- // Ideally this would be done when we receive the packet....
- struct rtc_timeval tv;
- rtctime_gettimeofday (&tv);
- if (tv.tv_sec == 0) {
- get_zero_base_timeofday(&tv);
- }
- #endif
- sntp_dbg("sntp: on_recv\n");
- if (!state || state->pcb != pcb)
- {
- // "impossible", but don't leak if it did happen somehow...
- udp_remove (pcb);
- pbuf_free (p);
- return;
- }
- if (!p)
- return;
- if (p->len < sizeof (ntp_frame_t))
- {
- pbuf_free (p);
- return; // not an ntp frame, ignore
- }
- // make sure we have an aligned copy to work from
- ntp_frame_t ntp;
- os_memcpy (&ntp, p->payload, sizeof (ntp));
- pbuf_free (p);
- sntp_dbg("sntp: transmit timestamp: %u, %u\n", ntp.xmit.sec, ntp.xmit.frac);
- // sanity checks before we touch our clocks
- ip_addr_t anycast;
- NTP_ANYCAST_ADDR(&anycast);
- if (serverp[state->server_pos].addr != anycast.addr && serverp[state->server_pos].addr != addr->addr)
- return; // unknown sender, ignore
- if (ntp.origin.sec != state->cookie.sec ||
- ntp.origin.frac != state->cookie.frac)
- return; // unsolicited message, ignore
- if (ntp.LI == 3) {
- if (memcmp(&ntp.refid, "DENY", 4) == 0) {
- // KoD packet
- if (state->kodbits & (1 << state->server_pos)) {
- // Oh dear -- two packets rxed. Kill this entry
- serverp[state->server_pos].addr = 0;
- } else {
- state->kodbits |= (1 << state->server_pos);
- }
- }
- return; // server clock not synchronized (why did it even respond?!)
- }
- // clear kod -- we got a good packet back
- state->kodbits &= ~(1 << state->server_pos);
- os_timer_disarm(&state->timer);
- if (ntp.LI) {
- pending_LI = ntp.LI;
- }
- update_offset();
- ntp.origin.sec = ntohl (ntp.origin.sec);
- ntp.origin.frac = ntohl (ntp.origin.frac);
- ntp.recv.sec = ntohl (ntp.recv.sec);
- ntp.recv.frac = ntohl (ntp.recv.frac);
- ntp.xmit.sec = ntohl (ntp.xmit.sec);
- ntp.xmit.frac = ntohl (ntp.xmit.frac);
- const uint64_t MICROSECONDS = 1000000ull;
- const uint32_t NTP_TO_UNIX_EPOCH = 2208988800ul;
- uint32_t root_maxerr = ntohl(ntp.root_dispersion) + ntohl(ntp.root_delay) / 2;
- bool same_as_last = state->server_pos == state->last_server_pos;
- // if we have rtctime, do higher resolution delta calc, else just use
- // the transmit timestamp
- #ifdef LUA_USE_MODULES_RTCTIME
- ntp_timestamp_t dest;
- dest.sec = tv.tv_sec + NTP_TO_UNIX_EPOCH - the_offset;
- dest.frac = US_TO_FRAC(tv.tv_usec);
- uint64_t ntp_recv = (((uint64_t) ntp.recv.sec) << 32) + (uint64_t) ntp.recv.frac;
- uint64_t ntp_origin = (((uint64_t) ntp.origin.sec) << 32) + (uint64_t) ntp.origin.frac;
- uint64_t ntp_xmit = (((uint64_t) ntp.xmit.sec) << 32) + (uint64_t) ntp.xmit.frac;
- uint64_t ntp_dest = (((uint64_t) dest.sec) << 32) + (uint64_t) dest.frac;
- // Compensation as per RFC2030
- int64_t delta = (int64_t) (ntp_recv - ntp_origin) / 2 + (int64_t) (ntp_xmit - ntp_dest) / 2;
- record_result(same_as_last, addr, delta, ntp.stratum, ntp.LI, ((int64_t)(ntp_dest - ntp_origin - (ntp_xmit - ntp_recv))) >> 16, root_maxerr, ntohl(ntp.root_dispersion), ntohl(ntp.root_delay));
- #else
- uint64_t ntp_xmit = (((uint64_t) ntp.xmit.sec - NTP_TO_UNIX_EPOCH) << 32) + (uint64_t) ntp.xmit.frac;
- record_result(same_as_last, addr, ntp_xmit, ntp.stratum, ntp.LI, (((int64_t) (system_get_time() - ntp.origin.frac)) << 16) / MICROSECONDS, root_maxerr, ntohl(ntp.root_dispersion), ntohl(ntp.root_delay));
- #endif
- sntp_dosend();
- }
- #ifdef LUA_USE_MODULES_RTCTIME
- static int sntp_setoffset(lua_State *L)
- {
- the_offset = luaL_checkinteger(L, 1);
- struct rtc_timeval tv;
- rtctime_gettimeofday (&tv);
- if (tv.tv_sec) {
- next_midnight = get_next_midnight(tv.tv_sec);
- }
- using_offset = 1;
- return 0;
- }
- static int sntp_getoffset(lua_State *L)
- {
- update_offset();
- lua_pushnumber(L, the_offset);
- return 1;
- }
- #endif
- static void sntp_dolookups (lua_State *L) {
- // Step through each element of the table, converting it to an address
- // at the end, start the lookups. If we have already looked everything up,
- // then move straight to sending the packets.
- if ((state->list_ref == LUA_NOREF) || (state->list_ref == LUA_REFNIL)) {
- sntp_dosend();
- return;
- }
- lua_rawgeti(L, LUA_REGISTRYINDEX, state->list_ref);
- while (1) {
- int l;
- if (lua_objlen(L, -1) <= state->lookup_pos) {
- // We reached the end
- if (server_count == 0) {
- // Oh dear -- no valid entries -- generate an error
- // This means that all the arguments are invalid. Just pick the first
- lua_rawgeti(L, -1, 1);
- const char *hostname = luaL_checklstring(L, -1, &l);
- handle_error(L, NTP_DNS_ERR, hostname);
- lua_pop(L, 1);
- } else {
- sntp_dosend();
- }
- break;
- }
- state->lookup_pos++;
- lua_rawgeti(L, -1, state->lookup_pos);
- const char *hostname = luaL_checklstring(L, -1, &l);
- lua_pop(L, 1);
- if (l>128 || hostname == NULL) {
- handle_error(L, NTP_DNS_ERR, hostname);
- break;
- }
- err_t err = dns_gethostbyname(hostname, get_free_server(), sntp_dns_found, state);
- if (err == ERR_INPROGRESS)
- break; // Callback function sntp_dns_found will handle sntp_dosend for us
- else if (err == ERR_ARG) {
- handle_error(L, NTP_DNS_ERR, hostname);
- break;
- }
- server_count++;
- }
- lua_pop(L, 1);
- }
- static char *state_init(lua_State *L) {
- state = (sntp_state_t *)malloc (sizeof (sntp_state_t));
- if (!state)
- return ("out of memory");
- memset (state, 0, sizeof (sntp_state_t));
- state->sync_cb_ref = LUA_NOREF;
- state->err_cb_ref = LUA_NOREF;
- state->list_ref = LUA_NOREF;
- state->pcb = udp_new ();
- if (!state->pcb)
- return ("out of memory");
- if (udp_bind (state->pcb, IP_ADDR_ANY, 0) != ERR_OK)
- return ("no port available");
- udp_recv (state->pcb, on_recv, L);
- state->server_pos = -1;
- state->last_server_pos = -1;
- return NULL;
- }
- static char *set_repeat_mode(lua_State *L, bool enable)
- {
- if (repeat) {
- os_timer_disarm (&repeat->timer);
- luaL_unref (L, LUA_REGISTRYINDEX, repeat->sync_cb_ref);
- luaL_unref (L, LUA_REGISTRYINDEX, repeat->err_cb_ref);
- luaL_unref (L, LUA_REGISTRYINDEX, repeat->list_ref);
- free(repeat);
- repeat = NULL;
- }
- if (enable) {
- repeat = (sntp_repeat_t *) malloc(sizeof(sntp_repeat_t));
- if (!repeat) {
- return "no memory";
- }
- memset(repeat, 0, sizeof(repeat));
- lua_rawgeti(L, LUA_REGISTRYINDEX, state->sync_cb_ref);
- repeat->sync_cb_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- lua_rawgeti(L, LUA_REGISTRYINDEX, state->err_cb_ref);
- repeat->err_cb_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- lua_rawgeti(L, LUA_REGISTRYINDEX, state->list_ref);
- repeat->list_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- os_timer_setfn(&repeat->timer, on_long_timeout, NULL);
- SWTIMER_REG_CB(on_long_timeout, SWTIMER_RESUME);
- //The function on_long_timeout returns errors to the developer
- //My guess: Error reporting is a good thing, resume the timer.
- os_timer_arm(&repeat->timer, 1000 * 1000, 1);
- }
- return NULL;
- }
- static void on_long_timeout (void *arg)
- {
- (void)arg;
- sntp_dbg("sntp: long timer\n");
- lua_State *L = lua_getstate ();
- if (!state) {
- if (!state_init(L)) {
- // Good.
- lua_rawgeti(L, LUA_REGISTRYINDEX, repeat->sync_cb_ref);
- state->sync_cb_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- lua_rawgeti(L, LUA_REGISTRYINDEX, repeat->err_cb_ref);
- state->err_cb_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- if (server_count == 0) {
- lua_rawgeti(L, LUA_REGISTRYINDEX, repeat->list_ref);
- state->list_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- }
- state->is_on_timeout = 1;
- sntp_dolookups(L);
- }
- }
- }
- // sntp.sync (server or nil, syncfn or nil, errfn or nil)
- static int sntp_sync (lua_State *L)
- {
- set_repeat_mode(L, 0);
- const char *errmsg = 0;
- #define sync_err(x) do { errmsg = x; goto error; } while (0)
- if (state)
- return luaL_error (L, "sync in progress");
- char *state_err;
- state_err = state_init(L);
- if (state_err) {
- sync_err(state_err);
- }
- if (!lua_isnoneornil (L, 2))
- {
- lua_pushvalue (L, 2);
- state->sync_cb_ref = luaL_ref (L, LUA_REGISTRYINDEX);
- }
- if (!lua_isnoneornil (L, 3))
- {
- lua_pushvalue (L, 3);
- state->err_cb_ref = luaL_ref (L, LUA_REGISTRYINDEX);
- }
- // use last server, unless new one specified
- if (!lua_isnoneornil (L, 1))
- {
- server_count = 0;
- if (lua_istable(L, 1)) {
- // Save a reference to the table
- lua_pushvalue(L, 1);
- } else {
- size_t l;
- const char *hostname = luaL_checklstring(L, 1, &l);
- if (l>128 || hostname == NULL)
- sync_err("need <128 hostname");
- /* Construct a singleton table containing the one server */
- lua_newtable(L);
- lua_pushnumber(L, 1);
- lua_pushstring(L, hostname);
- lua_settable(L, -3);
- }
- } else if (server_count == 0) {
- lua_newtable(L);
- struct netif *iface = (struct netif *)eagle_lwip_getif(0x00);
- if (iface->dhcp && iface->dhcp->offered_ntp_addr.addr) {
- ip_addr_t ntp_addr = iface->dhcp->offered_ntp_addr;
- lua_pushnumber(L, 1);
- lua_pushstring(L, inet_ntoa(ntp_addr));
- lua_settable(L, -3);
- } else {
- // default to ntp pool
- int i;
- for (i = 0; i < 4; i++) {
- lua_pushnumber(L, i + 1);
- char buf[64];
- sprintf(buf, "%d.nodemcu.pool.ntp.org", i);
- lua_pushstring(L, buf);
- lua_settable(L, -3);
- }
- }
- }
- luaL_unref (L, LUA_REGISTRYINDEX, state->list_ref);
- state->list_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- sntp_dolookups(L);
- if (!lua_isnoneornil(L, 4)) {
- set_repeat_mode(L, 1);
- }
- return 0;
- error:
- if (state)
- {
- if (state->pcb)
- udp_remove (state->pcb);
- free (state);
- state = 0;
- }
- return luaL_error (L, errmsg);
- }
- static void sntp_task(os_param_t param, uint8_t prio)
- {
- (void) param;
- (void) prio;
- lua_State *L = lua_getstate();
- if (param == SNTP_HANDLE_RESULT_ID) {
- sntp_handle_result(L);
- } else if (param == SNTP_DOLOOKUPS_ID) {
- sntp_dolookups(L);
- } else {
- handle_error(L, param, NULL);
- }
- }
- static int sntp_open(lua_State *L)
- {
- (void) L;
- tasknumber = task_get_id(sntp_task);
- return 0;
- }
- // Module function map
- LROT_BEGIN(sntp, NULL, 0)
- LROT_FUNCENTRY( sync, sntp_sync )
- #ifdef LUA_USE_MODULES_RTCTIME
- LROT_FUNCENTRY( setoffset, sntp_setoffset )
- LROT_FUNCENTRY( getoffset, sntp_getoffset )
- #endif
- LROT_END(sntp, NULL, 0)
- NODEMCU_MODULE(SNTP, "sntp", sntp, sntp_open);
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