[Bug 280036] Data corruption over if_ovpn (OpenVPN DCO) observed

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 31 Aug 2024 04:52:28 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280036

--- Comment #8 from ss3bsd <3226388001@jcom.home.ne.jp> ---
(In reply to Zhenlei Huang from comment #4)

I guess the file is entirely corrupted.

---

# md5sum randomfile*
4d1b051f8bdea93ddca5d8831a0a829c  randomfile
4d1b051f8bdea93ddca5d8831a0a829c  randomfile.returned1
dd8e4c1a9839976c9e812456ecf71b3a  randomfile.returned2
de2d31f956a53a0a86e64058886eb1e9  randomfile.returned3
9432cd3c1ec5540e5251f657e18b93a8  randomfile.returned4


# hexdump -x randomfile > randomfile.hex
# hexdump -x randomfile.returned2 > randomfile.returned2.hex

# head randomfile.hex
0000000    0595    a291    c861    c7ee    c67a    59ab    73ca    66e3
0000010    29ca    9d14    d874    fe71    2fe2    76ae    93b0    cb1a
0000020    df5b    a72f    2256    1e88    337d    d9a8    4a12    0923
0000030    5a72    56f6    64f8    647a    7a2c    a33b    5f0b    87ec
0000040    e86e    fe3e    62a3    e1f4    992a    3fc1    7535    c273
0000050    40f1    ce42    6895    cf20    e272    74b5    485a    8f9b
0000060    584e    3431    78bd    f48c    efd4    cfc8    cd19    8ca7
0000070    cf09    78b2    a189    3d08    4c4e    3acb    057d    3a20
0000080    06d9    2c22    a667    8b38    0aaa    7176    c86f    71b3
0000090    9dd8    6128    4a08    2475    674d    f801    daf7    4fe9

# head randomfile.returned2.hex
0000000    9ae9    866b    3498    82ee    aef9    abeb    af8a    6ae4
0000010    ce04    3671    301d    af4e    fab0    f01d    890a    a143
0000020    8635    7c19    982f    0dcf    34e3    c09e    9992    54ad
0000030    1a97    2a3b    78c4    b3a9    3230    3a67    3649    5f97
0000040    5944    7980    adde    5f02    1e35    73f0    4b7d    32ee
0000050    bd6d    514a    4065    9817    fe0d    6d74    7736    626e
0000060    ef27    d331    7f8b    2ebb    5568    9b92    7264    7846
0000070    606a    0132    d1c9    1a3e    230e    4061    3897    c873
0000080    78ea    e2f7    6f54    38c2    ceb9    413d    557f    20ea
0000090    3ac1    3367    7f3b    01bf    fc96    75bb    549a    5b3e

# diff randomfile.hex randomfile.returned2.hex > randomfile.hex.diff

# wc *.hex*
  262145 2359297 18874376 randomfile.hex
  524290 5242882 38797334 randomfile.hex.diff
  262145 2359297 18874376 randomfile.returned2.hex
 1048580 9961476 76546086 total

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