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@ -9,6 +9,71 @@ import ( |
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"time" |
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) |
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func main() { |
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if len(os.Args) < 2 { |
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fmt.Fprintf(os.Stderr, |
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"required argument missing\n") |
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os.Exit(1) |
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} |
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raw, err := ioutil.ReadFile(os.Args[1]) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, |
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"error reading \"%s\": %s\n", |
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os.Args[1], err.Error()) |
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} |
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sdb, err := parseSDB(raw) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, |
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"%s\n", err.Error()) |
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os.Exit(1) |
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} |
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fmt.Printf("Protocol Revision: %d\n", |
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sdb.ProtocolRevision) |
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fmt.Printf("Message Length: %d\n", |
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sdb.Length) |
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for c, i := range sdb.Elements { |
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if c > 0 { |
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fmt.Println() |
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} |
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switch v := i.(type) { |
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case MOHeader: |
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fmt.Printf("\tMO Header IEI: %d\n", |
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v.IEI) |
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fmt.Printf("\tMO Header Length: %d\n", |
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v.Length) |
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fmt.Printf("\tMO Header CDR Reference: %d\n", |
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v.CDRReference) |
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fmt.Printf("\tMO Header IMEI: %s\n", |
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v.IMEI) |
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fmt.Printf("\tMO Header Status: %s (%d)\n", |
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v.StatusString(), v.Status) |
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fmt.Printf("\tMO Header MOMSN: %d\n", |
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v.MOMSN) |
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fmt.Printf("\tMO Header MTMSN: %d\n", |
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v.MTMSN) |
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fmt.Printf("\tMO Header Session Time: %s\n", |
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v.SessionTime().String()) |
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case MOPayload: |
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fmt.Printf("\tMO Payload IEI: %d\n", |
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v.IEI) |
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fmt.Printf("\tMO Payload Length: %d\n", |
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v.Length) |
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case MOConfirmation: |
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fmt.Printf("\tMO Confirmation IEI: %d\n", |
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v.IEI) |
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fmt.Printf("\tMO Confirmation Length: %d\n", |
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v.Length) |
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fmt.Printf("\tMO Confirmation Status: %d\n", |
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v.Status) |
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} |
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} |
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} |
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type IridiumSDB struct { |
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ProtocolRevision byte |
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Length uint16 |
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@ -76,32 +141,10 @@ type MOConfirmation struct { |
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Status byte |
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} |
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func main() { |
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if len(os.Args) < 2 { |
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fmt.Fprintf(os.Stderr, |
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"required argument missing\n") |
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os.Exit(1) |
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} |
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raw, err := ioutil.ReadFile(os.Args[1]) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, |
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"error reading \"%s\": %s\n", |
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os.Args[1], err.Error()) |
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} |
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err = parseSDB(raw) |
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if err != nil { |
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fmt.Fprintf(os.Stderr, |
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"%s\n", err.Error()) |
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os.Exit(1) |
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} |
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} |
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func parseSDB(raw []byte) error { |
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func parseSDB(raw []byte) (*IridiumSDB, error) { |
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raw_len := len(raw) |
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if raw_len < 3 { |
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return fmt.Errorf("message structure too short: %d bytes", |
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return nil, fmt.Errorf("message structure too short: %d bytes", |
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len(raw)) |
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} |
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@ -110,20 +153,20 @@ func parseSDB(raw []byte) error { |
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sdb.Length = binary.BigEndian.Uint16(raw[1:3]) |
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if (int(sdb.Length) + 3) != raw_len { |
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return fmt.Errorf("invalid message length (expected %d, got %d)", |
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return nil, fmt.Errorf("invalid message length (expected %d, got %d)", |
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(sdb.Length + 3), raw_len) |
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} |
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for i := 3; i < raw_len; { |
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if (i + 3) > raw_len { |
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return fmt.Errorf("invalid element length (at %d)", |
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return nil, fmt.Errorf("invalid element length (at %d)", |
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i) |
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} |
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el_iei := raw[i] |
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el_len := binary.BigEndian.Uint16(raw[i+1 : i+3]) |
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if (i + 3 + int(el_len)) > raw_len { |
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return fmt.Errorf("invalid element length (at %d): %d", |
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return nil, fmt.Errorf("invalid element length (at %d): %d", |
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i+1, el_len) |
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} |
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@ -134,7 +177,7 @@ func parseSDB(raw []byte) error { |
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moheader := MOHeader{} |
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err := binary.Read(buf, binary.BigEndian, &moheader) |
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if err != nil { |
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return fmt.Errorf("error reading MO header (at %d): %s", |
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return nil, fmt.Errorf("error reading MO header (at %d): %s", |
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i, err.Error()) |
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} |
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sdb.Elements = append(sdb.Elements, moheader) |
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@ -153,7 +196,7 @@ func parseSDB(raw []byte) error { |
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molocation := MOLocation{} |
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err := binary.Read(buf, binary.BigEndian, &molocation) |
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if err != nil { |
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return fmt.Errorf("error reading MO location (at %d): %s", |
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return nil, fmt.Errorf("error reading MO location (at %d): %s", |
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i, err.Error()) |
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} |
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sdb.Elements = append(sdb.Elements, molocation) |
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@ -167,55 +210,12 @@ func parseSDB(raw []byte) error { |
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sdb.Elements = append(sdb.Elements, moconfirmation) |
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default: |
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return fmt.Errorf("invalid element IEI (at %d): %d", |
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return nil, fmt.Errorf("invalid element IEI (at %d): %d", |
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i, el_iei) |
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} |
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i += (3 + int(el_len)) |
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} |
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fmt.Printf("Protocol Revision: %d\n", |
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sdb.ProtocolRevision) |
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fmt.Printf("Message Length: %d\n", |
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sdb.Length) |
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for c, i := range sdb.Elements { |
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if c > 0 { |
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fmt.Println() |
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} |
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switch v := i.(type) { |
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case MOHeader: |
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fmt.Printf("\tMO Header IEI: %d\n", |
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v.IEI) |
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fmt.Printf("\tMO Header Length: %d\n", |
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v.Length) |
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fmt.Printf("\tMO Header CDR Reference: %d\n", |
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v.CDRReference) |
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fmt.Printf("\tMO Header IMEI: %s\n", |
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v.IMEI) |
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fmt.Printf("\tMO Header Status: %s (%d)\n", |
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v.StatusString(), v.Status) |
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fmt.Printf("\tMO Header MOMSN: %d\n", |
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v.MOMSN) |
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fmt.Printf("\tMO Header MTMSN: %d\n", |
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v.MTMSN) |
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fmt.Printf("\tMO Header Session Time: %s\n", |
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v.SessionTime().String()) |
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case MOPayload: |
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fmt.Printf("\tMO Payload IEI: %d\n", |
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v.IEI) |
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fmt.Printf("\tMO Payload Length: %d\n", |
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v.Length) |
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case MOConfirmation: |
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fmt.Printf("\tMO Confirmation IEI: %d\n", |
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v.IEI) |
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fmt.Printf("\tMO Confirmation Length: %d\n", |
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v.Length) |
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fmt.Printf("\tMO Confirmation Status: %d\n", |
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v.Status) |
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} |
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} |
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return nil |
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return &sdb, nil |
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} |