ntp and udp

1 files changed, 34 insertions, 0 deletions

diff --git a/net/ntp.h b/net/ntp.h
new file mode 100644
index 0000000..0b7fa00
--- /dev/null
+++ b/net/ntp.h
@@ -0,0 +1,34 @@
+//https://lettier.github.io/posts/2016-04-26-lets-make-a-ntp-client-in-c.html
+
+struct udp_v4_ntp
+{
+
+  uint8_t li_vn_mode;      // Eight bits. li, vn, and mode.
+                           // li.   Two bits.   Leap indicator.
+                           // vn.   Three bits. Version number of the protocol.
+                           // mode. Three bits. Client will pick mode 3 for client.
+
+  uint8_t stratum;         // Eight bits. Stratum level of the local clock.
+  uint8_t poll;            // Eight bits. Maximum interval between successive messages.
+  uint8_t precision;       // Eight bits. Precision of the local clock.
+
+  uint32_t rootDelay;      // 32 bits. Total round trip delay time.
+  uint32_t rootDispersion; // 32 bits. Max error aloud from primary clock source.
+  uint32_t refId;          // 32 bits. Reference clock identifier.
+
+  uint32_t refTm_s;        // 32 bits. Reference time-stamp seconds.
+  uint32_t refTm_f;        // 32 bits. Reference time-stamp fraction of a second.
+
+  uint32_t origTm_s;       // 32 bits. Originate time-stamp seconds.
+  uint32_t origTm_f;       // 32 bits. Originate time-stamp fraction of a second.
+
+  uint32_t rxTm_s;         // 32 bits. Received time-stamp seconds.
+  uint32_t rxTm_f;         // 32 bits. Received time-stamp fraction of a second.
+
+  uint32_t txTm_s;         // 32 bits and the most important field the client cares about. Transmit time-stamp seconds.
+  uint32_t txTm_f;         // 32 bits. Transmit time-stamp fraction of a second.
+
+                           // Total: 384 bits or 48 bytes.
+} __attribute__((packed));
+
+uint32_t ntp_generic(struct netdev *dev, uint32_t ip, uint16_t src, uint16_t dst, uint8_t* pos,uint8_t *end);