├── .gitignore ├── LICENSE.txt ├── README.rst └── pcap_diff.py /.gitignore: -------------------------------------------------------------------------------- 1 | *.py[cod] 2 | 3 | # C extensions 4 | *.so 5 | 6 | # Packages 7 | *.egg 8 | *.egg-info 9 | dist 10 | build 11 | eggs 12 | parts 13 | bin 14 | var 15 | sdist 16 | develop-eggs 17 | .installed.cfg 18 | lib 19 | lib64 20 | 21 | # Installer logs 22 | pip-log.txt 23 | 24 | # Unit test / coverage reports 25 | .coverage 26 | .tox 27 | nosetests.xml 28 | 29 | # Translations 30 | *.mo 31 | 32 | .project 33 | .pydevproject 34 | *~ 35 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | Copyright 2018 ETH Zurich, ISGINF, Bastian Ballmann 2 | E-Mail: bastian.ballmann@inf.ethz.ch 3 | Web: http://www.isg.inf.ethz.ch 4 | 5 | This is free software: you can redistribute it and/or modify 6 | it under the terms of the GNU General Public License as published by 7 | the Free Software Foundation, either version 3 of the License, or 8 | (at your option) any later version. 9 | 10 | It is distributed in the hope that it will be useful, 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 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It is safest 644 | to attach them to the start of each source file to most effectively 645 | state the exclusion of warranty; and each file should have at least 646 | the "copyright" line and a pointer to where the full notice is found. 647 | 648 | 649 | Copyright (C) 650 | 651 | This program is free software: you can redistribute it and/or modify 652 | it under the terms of the GNU General Public License as published by 653 | the Free Software Foundation, either version 3 of the License, or 654 | (at your option) any later version. 655 | 656 | This program is distributed in the hope that it will be useful, 657 | but WITHOUT ANY WARRANTY; without even the implied warranty of 658 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 659 | GNU General Public License for more details. 660 | 661 | You should have received a copy of the GNU General Public License 662 | along with this program. If not, see . 663 | 664 | Also add information on how to contact you by electronic and paper mail. 665 | 666 | If the program does terminal interaction, make it output a short 667 | notice like this when it starts in an interactive mode: 668 | 669 | Copyright (C) 670 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 671 | This is free software, and you are welcome to redistribute it 672 | under certain conditions; type `show c' for details. 673 | 674 | The hypothetical commands `show w' and `show c' should show the appropriate 675 | parts of the General Public License. Of course, your program's commands 676 | might be different; for a GUI interface, you would use an "about box". 677 | 678 | You should also get your employer (if you work as a programmer) or school, 679 | if any, to sign a "copyright disclaimer" for the program, if necessary. 680 | For more information on this, and how to apply and follow the GNU GPL, see 681 | . 682 | 683 | The GNU General Public License does not permit incorporating your program 684 | into proprietary programs. If your program is a subroutine library, you 685 | may consider it more useful to permit linking proprietary applications with 686 | the library. If this is what you want to do, use the GNU Lesser General 687 | Public License instead of this License. But first, please read 688 | . 689 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | pcap-diff 2 | ========= 3 | 4 | Diff two or more pcap files and write a pcap file with different packets as result 5 | 6 | 7 | Requirements 8 | ============ 9 | 10 | Python 3.x 11 | Scapy (pip3 install scapy) 12 | 13 | 14 | Example usages 15 | ============== 16 | 17 | Diff client.dump and server.dump but ignore different packets on client side 18 | 19 | .. code-block:: bash 20 | 21 | pcap_diff.py -i client.dump -i server.dump -o diff.pcap -l 22 | 23 | Show all differences but ignore all mac addresses 24 | 25 | .. code-block:: bash 26 | 27 | pcap_diff.py -i client.dump -i server.dump -o diff.pcap -f m 28 | 29 | Ignore all IP Ids, TCP sequence and acknowledgement number 30 | 31 | .. code-block:: bash 32 | 33 | pcap_diff.py -i client.dump -i server.dump -o diff.pcap -f ii -f sa 34 | 35 | Ignore everthing below 802.11 layer 36 | 37 | .. code-block:: bash 38 | 39 | pcap_diff.py -i client.dump -i server.dump -o diff.pcap -L Dot11 40 | 41 | Do a diff over all packet headers including timestamps, ttl and checksums 42 | 43 | .. code-block:: bash 44 | 45 | pcap_diff.py -i client.dump -i server.dump -o diff.pcap -c 46 | 47 | 48 | License 49 | ======= 50 | 51 | Copyright 2013-2018 ETH Zurich, ISGINF, Bastian Ballmann 52 | E-Mail: bastian.ballmann@inf.ethz.ch 53 | Web: http://www.isg.inf.ethz.ch 54 | 55 | This is free software: you can redistribute it and/or modify 56 | it under the terms of the GNU General Public License as published by 57 | the Free Software Foundation, either version 3 of the License, or 58 | (at your option) any later version. 59 | 60 | It is distributed in the hope that it will be useful, 61 | but WITHOUT ANY WARRANTY; without even the implied warranty of 62 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 63 | GNU General Public License for more details. 64 | 65 | You should have received a copy of the GNU General Public License. 66 | If not, see . 67 | -------------------------------------------------------------------------------- /pcap_diff.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python3 2 | # 3 | # Diff two or more pcap files and write a pcap file with different packets as result 4 | # 5 | # 6 | # You need to install scapy to use this script 7 | # -> pip install scapy-python3 8 | # 9 | # Copyright 2013-2018 ETH Zurich, ISGINF, Bastian Ballmann 10 | # E-Mail: bastian.ballmann@inf.ethz.ch 11 | # Web: http://www.isg.inf.ethz.ch 12 | # 13 | # This is free software: you can redistribute it and/or modify 14 | # it under the terms of the GNU General Public License as published by 15 | # the Free Software Foundation, either version 3 of the License, or 16 | # (at your option) any later version. 17 | # 18 | # It is distributed in the hope that it will be useful, 19 | # but WITHOUT ANY WARRANTY; without even the implied warranty of 20 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 | # GNU General Public License for more details. 22 | # 23 | # You should have received a copy of the GNU General Public License. 24 | # If not, see . 25 | 26 | 27 | ###[ Loading modules ]### 28 | 29 | import sys 30 | import getopt 31 | from scapy.all import PcapReader, wrpcap, Packet, NoPayload 32 | 33 | 34 | ###[ Parsing parameter ]### 35 | 36 | output_file = None 37 | input_files = [] 38 | complete_diff = False 39 | ignore_source = False 40 | ignore_source_ip = False 41 | ignore_dest_ip = False 42 | ignore_source_mac = False 43 | ignore_macs = False 44 | ignore_seq_ack = False 45 | ignore_ip_id = False 46 | ignore_timestamp = False 47 | ignore_ttl = False 48 | ignore_ck = False 49 | ignore_headers = [] 50 | first_layer = None 51 | diff_only_left = False 52 | diff_only_right = False 53 | be_quiet = False 54 | show_diffs = False 55 | 56 | def usage(): 57 | print(sys.argv[0]) 58 | print(""" 59 | -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 60 | Diff two or more pcap files 61 | Programmed by Bastian Ballmann 62 | Version 1.3.0 63 | -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 64 | 65 | -i (use multiple times) 66 | -o (this is a pcap file) 67 | -c (complete diff, dont ignore ttl, checksums and timestamps) - False by default 68 | -l diff only left side (first pcap file) 69 | -L ignores everything below the given layer 70 | -r diff only right side (not first pcap file) 71 | -f s (ignore src ip / mac) 72 | -f sm (ignore src mac) 73 | -f si (ignore src ip) 74 | -f di (ignore dst ip) 75 | -f m (ignore mac addresses) 76 | -f sa (ignore tcp seq and ack num) 77 | -f ii (ignore ip id) 78 | -f ts (ignore timestamp) 79 | -f ttl (ignore ttl) 80 | -f ck (ignore checksum) 81 | -f 82 | -q be quiet 83 | -d show differences 84 | 85 | Example usage with ignore mac addresses 86 | pcap_diff.py -i client.dump -i server.dump -o diff.pcap -f m 87 | 88 | """) 89 | sys.exit(1) 90 | 91 | try: 92 | cmd_opts = "cf:i:L:lo:qrd" 93 | opts, args = getopt.getopt(sys.argv[1:], cmd_opts) 94 | except getopt.GetoptError: 95 | usage() 96 | 97 | for opt in opts: 98 | if opt[0] == "-i": 99 | input_files.append(opt[1]) 100 | elif opt[0] == "-o": 101 | output_file = opt[1] 102 | elif opt[0] == "-c": 103 | complete_diff = True 104 | elif opt[0] == "-d": 105 | show_diffs = True 106 | elif opt[0] == "-l": 107 | diff_only_left = True 108 | elif opt[0] == "-L": 109 | first_layer = opt[1] 110 | elif opt[0] == "-r": 111 | diff_only_right = True 112 | elif opt[0] == "-q": 113 | be_quiet = True 114 | elif opt[0] == "-f": 115 | if opt[1] == "s": 116 | ignore_source = True 117 | elif opt[1] == "sm": 118 | ignore_source_mac = True 119 | elif opt[1] == "sa": 120 | ignore_seq_ack = True 121 | elif opt[1] == "ii": 122 | ignore_ip_id = True 123 | ignore_ck = True 124 | elif opt[1] == "si": 125 | ignore_source_ip = True 126 | elif opt[1] == "di": 127 | ignore_dest_ip = True 128 | elif opt[1] == "m": 129 | ignore_macs = True 130 | elif opt[1] == "ts": 131 | ignore_timestamp = True 132 | elif opt[1] == "ttl": 133 | ignore_ttl = True 134 | ignore_ck = True 135 | elif opt[1] == "ck": 136 | ignore_ck = True 137 | else: 138 | ignore_headers.append(opt[1]) 139 | else: 140 | usage() 141 | 142 | if len(input_files) < 2: 143 | print("Need at least 2 input files to diff") 144 | sys.exit(1) 145 | 146 | 147 | ###[ Subroutines ]### 148 | 149 | def flatten(d, parent_key=''): 150 | """ 151 | Flatten a packet to a dict 152 | Remove checksums (can be different due to calculation in netdev firmware) 153 | """ 154 | items = [] 155 | 156 | # skip scapy internal fields 157 | skip_fields = ['fieldtype', 'underlayer', 'initialized', 'fieldtype', 158 | 'default_fields', 'aliastypes', 'post_transforms', 159 | 'packetfields', 'overloaded_fields', 'sent_time'] 160 | 161 | hasPayload = 'payload' in d 162 | 163 | for k, v in d.items(): 164 | fullk = "%s_%s" % (parent_key, k) 165 | 166 | # ignore the original if we have payload -- the payload will be expanded 167 | if hasPayload and k == 'original': 168 | continue 169 | 170 | # No complete diff? Ignore checksum, ttl and time 171 | if not complete_diff and (k == "chksum" or k == "ttl" or k == "time"): 172 | continue 173 | 174 | # ignore Timestamp 175 | if ignore_timestamp and k == "time": 176 | continue 177 | 178 | # skip time value of deeper layers (they all get it from Packet) 179 | if parent_key and k == "time": 180 | continue 181 | 182 | # Ignore source IP? 183 | if (ignore_source or ignore_source_ip) and k == "src": 184 | continue 185 | 186 | # Ignore dest IP? 187 | if ignore_dest_ip and k == "dst": 188 | continue 189 | 190 | # Ignore TCP seq and ack num? 191 | if ignore_seq_ack and (k == "seq" or k == "ack"): 192 | continue 193 | 194 | # Ignore IP ID? 195 | if ignore_ip_id and k == "id": 196 | continue 197 | 198 | # Ignore Time To Live (TTL) field in IPv4 Header 199 | if ignore_ttl and k == "ttl": 200 | continue 201 | 202 | # Ignore Checksum field in IPv4 Header 203 | if ignore_ck and k == "chksum": 204 | continue 205 | 206 | # Ignore custom header field? 207 | if fullk in ignore_headers: 208 | continue 209 | 210 | new_key = parent_key + '_' + k if parent_key else k 211 | 212 | # payload is Packet or str 213 | # stop at NoPayload payload 214 | if k == "payload" and isinstance(v, NoPayload): 215 | continue 216 | elif k == "payload" and isinstance(v, Packet): 217 | new_key = v.__class__.__name__ + "_" + k 218 | items.extend(flatten(v.__dict__, new_key).items()) 219 | elif k == "payload": 220 | new_key = v.__class__.__name__ + "_" + k 221 | items.append((new_key, v.payload)) 222 | elif k == "fields" and isinstance(v, Packet): 223 | new_key = v.__class__.__name__ + "_" + k 224 | items.extend(flatten(v, new_key).items()) 225 | elif k in skip_fields: 226 | continue # skip internal, unneeded fields 227 | elif isinstance(v, dict): 228 | items.extend(flatten(v, new_key).items()) 229 | else: 230 | items.append((new_key, v)) 231 | 232 | return dict(items) 233 | 234 | 235 | def serialize(packet): 236 | """ 237 | Serialize flattened packet 238 | """ 239 | 240 | # remove mac addresses? 241 | if ignore_macs and packet.fields: 242 | if packet.fields.get("src"): del packet.fields["src"] 243 | if packet.fields.get("dst"): del packet.fields["dst"] 244 | 245 | if (ignore_source or ignore_source_mac) and packet.fields.get("fields"): 246 | if packet.fields.get("src"): del packet.fields["src"] 247 | 248 | if first_layer and packet.haslayer(first_layer): 249 | flat_packet = flatten(packet[first_layer].fields) 250 | else: 251 | flat_packet = flatten(packet.fields) 252 | 253 | serial = "" 254 | 255 | for key in sorted(flat_packet): 256 | serial += str(key) + ": " + str(flat_packet[key]) + " | " 257 | 258 | return serial 259 | 260 | 261 | def read_dump(pcap_file): 262 | """ 263 | Read PCAP file 264 | Return dict of packets with serialized flat packet as key 265 | """ 266 | dump = {} 267 | count = 0 268 | 269 | if not be_quiet: 270 | sys.stdout.write("Reading file " + pcap_file + ":\n") 271 | sys.stdout.flush() 272 | 273 | with PcapReader(pcap_file) as pcap_reader: 274 | for packet in pcap_reader: 275 | count += 1 276 | dump[serialize(packet)] = packet 277 | 278 | if not be_quiet: 279 | sys.stdout.write("Found " + str(count) + " packets\n\n") 280 | sys.stdout.flush() 281 | 282 | return dump 283 | 284 | def compare_summary (): 285 | ret = "" 286 | if complete_diff: 287 | ret += "Complete, " 288 | if ignore_source: 289 | ret += "no src mac, no src ip, " 290 | if ignore_source_mac: 291 | ret += "no src mac, " 292 | if ignore_source_ip: 293 | ret += "no src ip, " 294 | if ignore_dest_ip: 295 | ret += "no dst ip, " 296 | if ignore_seq_ack: 297 | ret += "not seq ack, " 298 | if ignore_ip_id: 299 | ret += "no ip id, " 300 | if ignore_ttl: 301 | ret += "no ttl, " 302 | if ignore_ck: 303 | ret += "no checksum, " 304 | if ignore_timestamp: 305 | ret += "no timestamp, " 306 | for h in ignore_headers: 307 | ret += "no " + h + ", " 308 | 309 | return ret 310 | 311 | ###[ MAIN PART ]### 312 | 313 | # Parse pcap files 314 | dumps = [] 315 | 316 | for input_file in input_files: 317 | dumps.append(read_dump(input_file)) 318 | 319 | # Diff the dumps 320 | diff_counter = 0 321 | diff_packets = [] 322 | base_dump = dumps.pop(0) 323 | 324 | if not be_quiet: 325 | print("Diffing packets: " + compare_summary()) 326 | 327 | for packet in base_dump.values(): 328 | serial_packet = serialize(packet) 329 | found_packet = False 330 | 331 | for dump in dumps: 332 | if dump.get(serial_packet): 333 | del dump[serial_packet] 334 | found_packet = True 335 | 336 | if not diff_only_right and not found_packet: 337 | if show_diffs: 338 | print(" <<< " + packet.summary()) 339 | diff_packets.append(packet) 340 | 341 | if not diff_only_left: 342 | for dump in dumps: 343 | if len(dump.values()) > 0: 344 | diff_packets.extend(dump.values()) 345 | 346 | if show_diffs: 347 | for packet in dump.values(): 348 | packet.show() 349 | print(" >>> " + packet.summary()) 350 | 351 | if not be_quiet: 352 | print("\nFound " + str(len(diff_packets)) + " different packets\n") 353 | 354 | # Write pcap diff file? 355 | if output_file and diff_packets: 356 | if not be_quiet: 357 | print("Writing " + output_file) 358 | wrpcap(output_file, diff_packets) 359 | 360 | sys.exit(len(diff_packets)) 361 | else: 362 | sys.exit(0) 363 | --------------------------------------------------------------------------------