pySim-read.py: Enable reading of Home Network Domain Name from ISIM

As per TS1.103 version 14.2.0, this EF contains the home operator's network domain name.
The Home Network Domain Name, i.e. FQDN shall be encoded to an octet string
according to UTF-8 encoding rules as specified in IETF RFC 3629

Change-Id: Ia3c68c717d105e10d52a8e9d170480da2ad7d65a

pySim-read.py

@@ -304,6 +304,17 @@ if __name__ == '__main__':
 		except Exception as e:
 			print("P-CSCF: Can't read file -- " + str(e))
 
+		# EF.DOMAIN - Home Network Domain Name e.g. ims.mncXXX.mccXXX.3gppnetwork.org
+		try:
+			if card.file_exists(EF_ISIM_ADF_map['DOMAIN']):
+				(res, sw) = card.read_domain()
+				if sw == '9000':
+					print("Home Network Domain Name: %s" % (len(res) and res or 'Not available',))
+				else:
+					print("Home Network Domain Name: Can't read, response code = %s" % (sw,))
+		except Exception as e:
+			print("Home Network Domain Name: Can't read file -- " + str(e))
+
 	# Check whether we have th AID of ISIM, if so select it by its AID
 	# EF.IST - File Id in ADF ISIM : 6f07
 	if '9000' == card.select_adf_by_aid(adf="isim"):

pySim/cards.py

@@ -336,6 +336,16 @@ class IsimCard(Card):
 		data, sw = self._scc.update_record(EF_ISIM_ADF_map['PCSCF'], 1, rpad(content, rec_size_bytes*2))
 		return sw
 
+	def read_domain(self):
+		(res, sw) = self._scc.read_binary(EF_ISIM_ADF_map['DOMAIN'])
+		if sw == '9000':
+			# Skip the inital tag value ('80') byte and get length of contents
+			length = int(res[2:4], 16)
+			content = h2s(res[4:4+(length*2)])
+			return (content, sw)
+		else:
+			return (None, sw)
+
 
 class _MagicSimBase(Card):
 	"""

pysim-testdata/sysmoISIM-SJA2.ok

@@ -182,6 +182,7 @@ P-CSCF:
 	Not available
 	Not available
 
+Home Network Domain Name: Not available
 ISIM Service Table: 190200
 	Service 1 - P-CSCF address
 	Service 4 - GBA-based Local Key Establishment Mechanism