From 4e785a03772c128fadd03ddd1bd91e81952a46f9 Mon Sep 17 00:00:00 2001
From: Christopher Ramey <noreply@binarythought.com>
Date: Mon, 30 Sep 2019 19:26:36 -0800
Subject: [PATCH] Initial commit

---
 sdb.go | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 sdb.go

diff --git a/sdb.go b/sdb.go
new file mode 100644
index 0000000..c677c41
--- /dev/null
+++ b/sdb.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"os"
+	"fmt"
+	"bytes"
+	"encoding/binary"
+	"io/ioutil"
+)
+
+type IridiumSDB struct {
+	ProtocolRevision byte
+	MessageLength uint16
+	Message MOMessage
+}
+
+type MOMessage struct {
+	HeaderIEI byte
+	HeaderLength uint16
+	CDRReference uint32
+	IMEI [15]byte
+	Status byte
+	MOMSN uint16
+	MTMSN uint16
+	SessionTime uint32
+}
+
+var SessionStatusString = []string{
+	"The SBD session completed successfully.",
+	"The MO message transfer, if any, was successful. The MT message queued at the Iridium Gateway is too large to be transferred within a single SBD session.",
+	"The MO message transfer, if any, was successful. The reported location was determined to be of unacceptable quality. This value is only applicable to IMEIs using SBD protocol revision 1.",
+	"", // 3
+	"", // 4
+	"", // 5
+	"", // 6
+	"", // 7
+	"", // 8
+	"", // 9
+	"The SBD session timed out before session completion.",
+	"", // 11
+	"The MO message being transferred by the IMEI is too large to be transferred within a single SBD session.",
+	"An RF link loss occurred during the SBD session.",
+	"An IMEI protocol anomaly occurred during SBD session.",
+	"The IMEI is prohibited from accessing the Iridium Gateway."}
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Fprintf(os.Stderr, "required argument missing\n")
+    os.Exit(1)
+  }
+
+	rdt, err := ioutil.ReadFile(os.Args[1])
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error reading %s: %s\n", os.Args[1], err.Error())
+    os.Exit(1)
+	}
+
+	header := IridiumSDB{}
+	buf := bytes.NewBuffer(rdt)
+	err = binary.Read(buf, binary.BigEndian, &header)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error parsing %s: %s\n", os.Args[1], err.Error())
+    os.Exit(1)
+	}
+
+	fmt.Fprintf(os.Stdout, "Protocol Revision: %d\n", header.ProtocolRevision)
+	fmt.Fprintf(os.Stdout, "Message Length: %d\n", header.MessageLength)
+	fmt.Fprintf(os.Stdout, "MO Header IEI: %x\n", header.Message.HeaderIEI)
+	fmt.Fprintf(os.Stdout, "MO Header Length: %d\n", header.Message.HeaderLength)
+	fmt.Fprintf(os.Stdout, "CDR Reference: %d\n", header.Message.CDRReference)
+	fmt.Fprintf(os.Stdout, "IMEI: %s\n", string(header.Message.IMEI[:]))
+	fmt.Fprintf(os.Stdout, "Status: %s (%d)\n", SessionStatusString[header.Message.Status], header.Message.Status)
+	fmt.Fprintf(os.Stdout, "MOMSN: %d\n", header.Message.MOMSN)
+	fmt.Fprintf(os.Stdout, "MTMSN: %d\n", header.Message.MTMSN)
+	fmt.Fprintf(os.Stdout, "Session Time: %d\n", header.Message.SessionTime)
+}