laforge has uploaded this change for review. ( https://gerrit.osmocom.org/c/pysim/+/37926?usp=email )
Change subject: contrib: script to generate "update" commands from diff of fsdumps ...................................................................... contrib: script to generate "update" commands from diff of fsdumps Change-Id: I08897cd353093575f98c68580afbc68b6f2f878f --- A contrib/fsdump-diff-apply.py 1 file changed, 169 insertions(+), 0 deletions(-) git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/26/37926/1 diff --git a/contrib/fsdump-diff-apply.py b/contrib/fsdump-diff-apply.py new file mode 100755 index 0000000..c4f907e --- /dev/null +++ b/contrib/fsdump-diff-apply.py @@ -0,0 +1,169 @@ +#!/usr/bin/env python3 + +# The purpose of this script is to +# * load two SIM card 'fsdump' files +# * determine which file contents in "B" differs from that of "A" +# * create a pySim-shell script to update the contents of "A" to match that of "B" + +# (C) 2024 by Harald Welte <[email protected]> +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +import json +import argparse + +# Files that we should not update +FILES_TO_SKIP = [ + "MF/EF.ICCID", + #"MF/DF.GSM/EF.IMSI", + #"MF/ADF.USIM/EF.IMSI", + ] + +# Files that need zero-padding at the end, not ff-padding +FILES_PAD_ZERO = [ + "DF.GSM/EF.SST", + "MF/ADF.USIM/EF.UST", + "MF/ADF.USIM/EF.EST", + "MF/ADF.ISIM/EF.IST", + ] + +def pad_file(path, instr, byte_len): + if path in FILES_PAD_ZERO: + pad = '0' + else: + pad = 'f' + return pad_hexstr(instr, byte_len, pad) + +def pad_hexstr(instr, byte_len:int, pad='f'): + """Pad given hex-string to the number of bytes given in byte_len, using ff as padding.""" + if len(instr) == byte_len*2: + return instr + elif len(instr) > byte_len*2: + raise ValueError('Cannot pad string of length %u to smaller length %u' % (len(instr)/2, byte_len)) + else: + return instr + pad * (byte_len*2 - len(instr)) + +def is_all_ff(instr): + """Determine if the entire input hex-string consists of f-digits.""" + if all([x == 'f' for x in instr.lower()]): + return True + else: + return False + +parser = argparse.ArgumentParser() +parser.add_argument('file_a') +parser.add_argument('file_b') + + +if __name__ == '__main__': + opts = parser.parse_args() + + with open(opts.file_a, 'r') as file_a: + json_a = json.loads(file_a.read()) + with open(opts.file_b, 'r') as file_b: + json_b = json.loads(file_b.read()) + + for path in json_b.keys(): + print() + print("# %s" % path) + + if not path in json_a: + raise ValueError("%s doesn't exist in file_a!" % path) + + if path in FILES_TO_SKIP: + print("# skipped explicitly as it is in FILES_TO_SKIP") + continue + + if not 'body' in json_b[path]: + print("# file doesn't exist in B so we cannot possibly need to modify A") + continue + + if not 'body' in json_a[path]: + # file was not readable in original (permissions? deactivated?) + print("# ERROR: %s not readable in A; please fix that" % path) + continue + + body_a = json_a[path]['body'] + body_b = json_b[path]['body'] + if body_a == body_b: + print("# file body is identical") + continue + + file_size_a = json_a[path]['fcp']['file_size'] + file_size_b = json_b[path]['fcp']['file_size'] + + cmds = [] + structure = json_b[path]['fcp']['file_descriptor']['file_descriptor_byte']['structure'] + if structure == 'transparent': + val_a = body_a + val_b = body_b + if file_size_a < file_size_b: + if not is_all_ff(val_b[2*file_size_a:]): + print("# ERROR: file_size_a (%u) < file_size_b (%u); pleaes fix!" % (file_size_a, file_size_b)) + continue + else: + print("# WARN: file_size_a (%u) < file_size_b (%u); pleaes fix!" % (file_size_a, file_size_b)) + # truncate val_b to fit in A + val_b = val_b[:file_size_a*2] + + elif file_size_a != file_size_b: + print("# NOTE: file_size_a (%u) != file_size_b (%u)" % (file_size_a, file_size_b)) + + # Pad to file_size_a + val_b = pad_file(path, val_b, file_size_a) + if val_b != val_a: + cmds.append("update_binary %s" % val_b) + else: + print("# padded file body is identical") + elif structure in ['linear_fixed', 'cyclic']: + record_len_a = json_a[path]['fcp']['file_descriptor']['record_len'] + record_len_b = json_b[path]['fcp']['file_descriptor']['record_len'] + if record_len_a < record_len_b: + print("# ERROR: record_len_a (%u) < record_len_b (%u); pleaes fix!" % (file_size_a, file_size_b)) + continue + elif record_len_a != record_len_b: + print("# NOTE: record_len_a (%u) != record_len_b (%u)" % (record_len_a, record_len_b)) + + num_rec_a = file_size_a // record_len_a + num_rec_b = file_size_b // record_len_b + if num_rec_a < num_rec_b: + if not all([is_all_ff(x) for x in body_b[num_rec_a:]]): + print("# ERROR: num_rec_a (%u) < num_rec_b (%u); please fix!" % (num_rec_a, num_rec_b)) + continue + else: + print("# WARN: num_rec_a (%u) < num_rec_b (%u); but they're empty" % (num_rec_a, num_rec_b)) + elif num_rec_a != num_rec_b: + print("# NOTE: num_rec_a (%u) != num_rec_b (%u)" % (num_rec_a, num_rec_b)) + + i = 0 + for r in body_b: + if i < len(body_a): + break + val_a = body_a[i] + # Pad to record_len_a + val_b = pad_file(path, body_b[i], record_len_a) + if val_a != val_b: + cmds.append("update_record %u %s" % (i+1, val_b)) + i = i + 1 + if len(cmds) == 0: + print("# padded file body is identical") + elif structure == 'ber_tlv': + print("# FIXME: Implement BER-TLV") + else: + raise ValueError('Unsupported structure %s' % structure) + + if len(cmds): + print("select %s" % path) + for cmd in cmds: + print(cmd) -- To view, visit https://gerrit.osmocom.org/c/pysim/+/37926?usp=email To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings?usp=email Gerrit-MessageType: newchange Gerrit-Project: pysim Gerrit-Branch: master Gerrit-Change-Id: I08897cd353093575f98c68580afbc68b6f2f878f Gerrit-Change-Number: 37926 Gerrit-PatchSet: 1 Gerrit-Owner: laforge <[email protected]>
