Change in pysim[master]: utils: split string formatting from dec_addr_tlv

dexter gerrit-no-reply at lists.osmocom.org
Fri Apr 30 16:20:41 UTC 2021


dexter has uploaded this change for review. ( https://gerrit.osmocom.org/c/pysim/+/24010 )


Change subject: utils: split string formatting from dec_addr_tlv
......................................................................

utils: split string formatting from dec_addr_tlv

The function dec_addr_tlv() takes an encoded FQDN or IPv4 address and
fromats it into a human readable string that contains the human readable
form and the encoded hex form. Unfortunately this limits the usecase of
dec_addr_tlv. Lets split the string generation into a separate function
so that we can use dec_addr_tlv universally

Change-Id: Id017b0786089adac4d6c5be688742eaa9699e529
Related: OS#4963
---
M pySim/cards.py
M pySim/utils.py
2 files changed, 21 insertions(+), 7 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/10/24010/1

diff --git a/pySim/cards.py b/pySim/cards.py
index 719bf0c..71cc3b8 100644
--- a/pySim/cards.py
+++ b/pySim/cards.py
@@ -29,6 +29,19 @@
 from smartcard.util import toBytes
 from pytlv.TLV import *
 
+def format_addr(addr, addr_type='00'):
+	"""helper function to format an FQDN or IPv4 address into a printable string"""
+	res = ""
+	if addr_type == '00': #FQDN
+		res += "\t%s # %s\n" % (s2h(addr), addr)
+	elif addr_type == '01': #IPv4
+		octets = addr.split(".")
+		addr_hex = ""
+		for o in octets:
+			addr_hex += ("%02x" % int(o))
+		res += "\t%s # %s\n" % (addr_hex, addr)
+	return res
+
 class Card(object):
 
 	def __init__(self, scc):
@@ -299,7 +312,8 @@
 	def read_epdgid(self):
 		(res, sw) = self._scc.read_binary(EF_USIM_ADF_map['ePDGId'])
 		if sw == '9000':
-			return (dec_addr_tlv(res), sw)
+			addr, addr_type = dec_addr_tlv(res)
+			return (format_addr(addr, addr_type), sw)
 		else:
 			return (None, sw)
 
@@ -358,7 +372,8 @@
 		for i in range(0, rec_cnt):
 			(res, sw) = self._scc.read_record(EF_ISIM_ADF_map['PCSCF'], i + 1)
 			if sw == '9000':
-				content = dec_addr_tlv(res)
+				addr, addr_type = dec_addr_tlv(res)
+				content = format_addr(addr, addr_type)
 				pcscf_recs += "%s" % (len(content) and content or '\tNot available\n')
 			else:
 				pcscf_recs += "\tP-CSCF: Can't read, response code = %s\n" % (sw)
diff --git a/pySim/utils.py b/pySim/utils.py
index bcfa2ac..b788826 100644
--- a/pySim/utils.py
+++ b/pySim/utils.py
@@ -606,8 +606,6 @@
 	# Convert from hex str to int bytes list
 	addr_tlv_bytes = h2i(hexstr)
 
-	s = ""
-
 	# Get list of tuples containing parsed TLVs
 	tlvs = TLV_parser(addr_tlv_bytes)
 
@@ -632,15 +630,16 @@
 		if addr_type == 0x00: #FQDN
 			# Skip address tye byte i.e. first byte in value list
 			content = tlv[2][1:]
-			s += "\t%s # %s\n" % (i2h(content), i2s(content))
+			return (i2s(content), '00')
+
 		elif addr_type == 0x01: #IPv4
 			# Skip address tye byte i.e. first byte in value list
 			# Skip the unused byte in Octect 4 after address type byte as per 3GPP TS 31.102
 			ipv4 = tlv[2][2:]
 			content = '.'.join(str(x) for x in ipv4)
-			s += "\t%s # %s\n" % (i2h(ipv4), content)
+			return (content, '01')
 
-	return s
+	return (None, None)
 
 def enc_addr_tlv(addr, addr_type='00'):
 	"""

-- 
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Gerrit-Project: pysim
Gerrit-Branch: master
Gerrit-Change-Id: Id017b0786089adac4d6c5be688742eaa9699e529
Gerrit-Change-Number: 24010
Gerrit-PatchSet: 1
Gerrit-Owner: dexter <pmaier at sysmocom.de>
Gerrit-MessageType: newchange
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