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| 1 | +// SPDX-FileCopyrightText: 2023 SAP SE or an SAP affiliate company and IronCore contributors |
| 2 | +// SPDX-License-Identifier: Apache-2.0 |
| 3 | + |
| 4 | +use chrono::{DateTime, Local, TimeZone}; |
| 5 | +use log::{error, info, warn}; |
| 6 | +use sntpc::{NtpContext, StdTimestampGen}; |
| 7 | +use std::net::{Ipv6Addr, SocketAddr}; |
| 8 | +use std::time::Duration; |
| 9 | +use tokio::net::UdpSocket; |
| 10 | +use tokio::time::sleep; |
| 11 | + |
| 12 | +const FALLBACK_NTP_SERVER: &str = "pool.ntp.org"; |
| 13 | +const SYNC_INTERVAL: Duration = Duration::from_secs(86400); // 24 Hours |
| 14 | +const RETRY_INTERVAL: Duration = Duration::from_secs(300); // 5 Minutes |
| 15 | +const NTP_PORT: u16 = 123; |
| 16 | + |
| 17 | +pub struct TimeSyncWorker { |
| 18 | + ntp_servers: Vec<Ipv6Addr>, |
| 19 | +} |
| 20 | + |
| 21 | +impl TimeSyncWorker { |
| 22 | + pub fn new(ntp_servers: Vec<Ipv6Addr>) -> Self { |
| 23 | + Self { ntp_servers } |
| 24 | + } |
| 25 | + |
| 26 | + pub async fn run(self) { |
| 27 | + info!("TimeSyncWorker: Started."); |
| 28 | + |
| 29 | + // Initial sync |
| 30 | + self.perform_sync_loop().await; |
| 31 | + } |
| 32 | + |
| 33 | + async fn perform_sync_loop(&self) { |
| 34 | + loop { |
| 35 | + match self.synchronize_time().await { |
| 36 | + Ok(_) => { |
| 37 | + info!( |
| 38 | + "TimeSyncWorker: Time synchronization successful. Sleeping for 24 hours." |
| 39 | + ); |
| 40 | + sleep(SYNC_INTERVAL).await; |
| 41 | + } |
| 42 | + Err(e) => { |
| 43 | + error!( |
| 44 | + "TimeSyncWorker: Time synchronization failed: {e}. Retrying in 5 minutes." |
| 45 | + ); |
| 46 | + sleep(RETRY_INTERVAL).await; |
| 47 | + } |
| 48 | + } |
| 49 | + } |
| 50 | + } |
| 51 | + |
| 52 | + async fn synchronize_time(&self) -> Result<(), String> { |
| 53 | + let socket = UdpSocket::bind("[::]:0") |
| 54 | + .await |
| 55 | + .map_err(|e| format!("Failed to bind UDP socket: {e}"))?; |
| 56 | + |
| 57 | + for server_ip in &self.ntp_servers { |
| 58 | + info!("TimeSyncWorker: Attempting sync with DHCPv6 server: {server_ip}"); |
| 59 | + let target = SocketAddr::from((*server_ip, NTP_PORT)); |
| 60 | + |
| 61 | + match self.query_ntp_server(&socket, target, server_ip).await { |
| 62 | + Ok(_) => return Ok(()), |
| 63 | + Err(e) => { |
| 64 | + warn!("TimeSyncWorker: Failed to sync with {server_ip}: {e}"); |
| 65 | + } |
| 66 | + } |
| 67 | + } |
| 68 | + |
| 69 | + info!("TimeSyncWorker: Attempting sync with fallback server: {FALLBACK_NTP_SERVER}"); |
| 70 | + |
| 71 | + match self.resolve_and_sync(&socket, FALLBACK_NTP_SERVER).await { |
| 72 | + Ok(_) => Ok(()), |
| 73 | + Err(e) => Err(format!("Failed to sync with fallback server: {e}")), |
| 74 | + } |
| 75 | + } |
| 76 | + |
| 77 | + async fn resolve_and_sync(&self, socket: &UdpSocket, hostname: &str) -> Result<(), String> { |
| 78 | + use tokio::net::lookup_host; |
| 79 | + |
| 80 | + let server_with_port = format!("{hostname}:{NTP_PORT}"); |
| 81 | + let mut addrs = lookup_host(&server_with_port) |
| 82 | + .await |
| 83 | + .map_err(|e| format!("Failed to resolve {hostname}: {e}"))?; |
| 84 | + |
| 85 | + let target = addrs |
| 86 | + .find(|addr| addr.is_ipv6()) |
| 87 | + .or_else(|| { |
| 88 | + warn!("TimeSyncWorker: No IPv6 address found for {hostname}, trying IPv4"); |
| 89 | + None |
| 90 | + }) |
| 91 | + .ok_or_else(|| format!("No suitable address found for {hostname}"))?; |
| 92 | + |
| 93 | + info!("TimeSyncWorker: Resolved {hostname} to {target}"); |
| 94 | + |
| 95 | + let server_ip = match target.ip() { |
| 96 | + std::net::IpAddr::V6(ip) => ip, |
| 97 | + std::net::IpAddr::V4(_) => { |
| 98 | + return Err(format!( |
| 99 | + "Only IPv6 addresses are supported, got IPv4 for {hostname}" |
| 100 | + )); |
| 101 | + } |
| 102 | + }; |
| 103 | + |
| 104 | + self.query_ntp_server(socket, target, &server_ip).await |
| 105 | + } |
| 106 | + |
| 107 | + async fn query_ntp_server( |
| 108 | + &self, |
| 109 | + socket: &UdpSocket, |
| 110 | + target: SocketAddr, |
| 111 | + server_ip: &Ipv6Addr, |
| 112 | + ) -> Result<(), String> { |
| 113 | + let context = NtpContext::new(StdTimestampGen::default()); |
| 114 | + |
| 115 | + let result = sntpc::get_time(target, socket, context) |
| 116 | + .await |
| 117 | + .map_err(|e| format!("NTP query failed: {e:?}"))?; |
| 118 | + |
| 119 | + let seconds = result.sec(); |
| 120 | + let sec_fraction = result.sec_fraction(); |
| 121 | + |
| 122 | + let nanoseconds = sntpc::fraction_to_nanoseconds(sec_fraction); |
| 123 | + let server_time = Local |
| 124 | + .timestamp_opt(seconds as i64, nanoseconds) |
| 125 | + .single() |
| 126 | + .ok_or_else(|| "Failed to convert NTP time to local time".to_string())?; |
| 127 | + |
| 128 | + let offset_sec = result.offset() as f64 / 1_000_000.0; |
| 129 | + let delay_sec = result.roundtrip() as f64 / 1_000_000.0; |
| 130 | + |
| 131 | + info!( |
| 132 | + "TimeSyncWorker: {} ({:+.6}s offset) +/- {:.6}s delay, server: {} stratum: {}", |
| 133 | + server_time.format("%Y-%m-%d %H:%M:%S%.6f"), |
| 134 | + offset_sec, |
| 135 | + delay_sec, |
| 136 | + server_ip, |
| 137 | + result.stratum() |
| 138 | + ); |
| 139 | + |
| 140 | + self.set_system_time(server_time) |
| 141 | + .map_err(|e| format!("Failed to set system time: {e}"))?; |
| 142 | + |
| 143 | + Ok(()) |
| 144 | + } |
| 145 | + |
| 146 | + fn set_system_time(&self, dt: DateTime<Local>) -> Result<(), std::io::Error> { |
| 147 | + use libc::{clock_settime, timespec, CLOCK_REALTIME}; |
| 148 | + |
| 149 | + let ts = timespec { |
| 150 | + tv_sec: dt.timestamp(), |
| 151 | + tv_nsec: dt.timestamp_subsec_nanos() as _, |
| 152 | + }; |
| 153 | + |
| 154 | + let ret = unsafe { clock_settime(CLOCK_REALTIME, &ts) }; |
| 155 | + |
| 156 | + if ret != 0 { |
| 157 | + return Err(std::io::Error::last_os_error()); |
| 158 | + } |
| 159 | + |
| 160 | + info!("TimeSyncWorker: System clock updated to: {dt}"); |
| 161 | + Ok(()) |
| 162 | + } |
| 163 | +} |
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