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pySim.ota: Raise exception if encoded length would exceed 140 bytes

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SMS cannot exceed 140 bytes, and TS 31.115 explicitly states that larger
messages must use multi-part SMS, which we don't yet implement here.

Change-Id: I8a1543838be2add1c3cfdf7155676cf2b9827e6e
This commit is contained in:
Harald Welte
2024-07-13 22:58:44 +02:00
parent dacacd206d
commit 0c40a2245b
1 changed files with 3 additions and 0 deletions
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pySim/ota.py
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@@ -386,6 +386,9 @@ class OtaDialectSms(OtaDialect):
#print("envelope_data: %s" % b2h(envelope_data)) #print("envelope_data: %s" % b2h(envelope_data))
if len(envelope_data) > 140:
raise ValueError('Cannot encode command in a single SMS; Fragmentation not implemented')
return envelope_data return envelope_data
def decode_cmd(self, otak: OtaKeyset, encoded: bytes) -> Tuple[bytes, dict, bytes]: def decode_cmd(self, otak: OtaKeyset, encoded: bytes) -> Tuple[bytes, dict, bytes]: