ASN.1
description
Transcript of ASN.1
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Abstract Syntax Notation One
ASN.1
Student: Traila Stefan Bogdan
Coordonator: Prof. Dr. Ing. Stefan Stancescu
Facultatea de Electronica, Telecomunicat i i s i Tehnolog ia In format ie i , Univers i tatea Po l i tehnica Bucurest i , 2014
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• Abstract Syntax Notation One este un limbaj utilizat pentru a descrie informatia structurata, de obicei intentionata de a fi transferata printr-o interfata sau un mediu de comunicare.
• ASN.1 este un standard international.
• Este foarte des folosit in protocoalele de comunicatie.
Introducere
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• Limbaj care defineste informatie structurata
• Utilizat in special pentru interfete si medii de comunicare
• Standardizat
• Similar cu un limbaj de programare high level
ASN.1
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• High level
• Ideal pentru aplicatii complexe
• Nu necesita ca utilizatorul sa stie ordinea bitilor dintr-un sir
• Compilatoarele se ocupa de codarea si decodarea mesajelor
Avantaje
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Tipuri de date:
Alte tipuri pot fi create utilizand constructori:
SET {} si SEQUENCE {}
Sintaxa abstracta
Tipuri de date simple Siruri de caractere Tipuri specialeBOOLEAN NumericString GeneralizedTimeINTEGER PrintableString UTCTime
ENUMERATED TeletexString EXTERNALREAL IA5String ObjectDescriptor
BIT STRING GraphicString OCTET STRING GeneralString
NULL
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Exista mai multe seturi de codare:
1. BER – Basic Encoding Rules
2. CER – Canonical Encoding Rules
3. DER – Distinguished Encoding Rules
4. PER – Packed Encoding Rules
Sintaxa de transfer
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- Simple Flag BOOLEAN
- StructurateProcesVerbal ::=SEQUENCE
{
Data UTCTime
Viteza INTEGER (50..350)
Nume REAL
NrInmatriculare REAL
}
Tipuri de date si Valori
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Tipuri de date cu anumite constrangeri
Weekend ::= DaysOfTheWeek (sambata | duminica)
Subtipuri
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Tipurile de date pot avea ca referinta nume
In componenta numelor pot intra:
- Litere mari: ABCD...
- Litere mici: abcd...
- Cifre: 1234...
- Cratima: -
Constrangeri:
- Numele trebuie sa inceapa cu o litera
- Nu pot fi identice cu cele rezervate pentru sistem: ex. BOOLEAN
- Nu au limita de lungime
Nume
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Grupeaza un set de definitii.
DocumenteAmenzi {1 7 543 23 1} DEFINITIONS ::=
BEGIN
ProcesVerbal ::= SEQUENCE {...}
exempluProcesVerbal ProcesVerbal ::= {...}
END
MODULE
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Permite definirea de obiecte cu anumite atribute.
Baiat ::= SEQUENCE
{
Inaltime INTEGER
Greutate INTEGER
Varsta INTEGER
}
MACRO
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BER – Basic Encoding Rules
IDENTIFIER – LENGTH - CONTENTS
Reguli de codare
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X.680 ISO/IEC 8824-1
Basic ASN.1 Notation
Standarde
X.690 ISO/IEC 8825-1
Basic, Canonical and Distinguished Encoding Rules
X.691 SO/IEC 8825-2
Packed Encoding Rules
Aplicatii:
SNMP
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Simple Network Management Protocol
- Administrator
- Agent
- Baza de date
- MIB (Management Information BASE
Aplicatii - SNMP