tree d6a8a5160b6fce3802adbba47237c34df32552a3
parent 01a3f2074044eb623fb350dc8202830181af169a
author Thierry FOURNIER <thierry.fournier@ozon.io> 1526639139 +0200
committer Willy Tarreau <w@1wt.eu> 1526644253 +0200
encoding latin1

BUG/MEDIUM: spoe: Flags are not encoded in network order

The flags are direct copy of the "unsigned int" in the network stream,
so the stream contains a 32 bits field encoded with the host endian.
 - This is not reliable for stream betwen different architecture host
 - For x86, the bits doesn't correspond to the documentation.

This patch add some precision in the documentation and put the bitfield
in the stream usig network butes order.

Warning: this patch can break compatibility with existing agents.

This patch should be backported in all version supporing SPOE

Original network capture:

   12:28:16.181343 IP 127.0.0.1.46782 > 127.0.0.1.12345: Flags [P.], seq 134:168, ack 59, win 342, options [nop,nop,TS val 2855241281 ecr 2855241281], length 34
           0x0000:  4500 0056 6b94 4000 4006 d10b 7f00 0001  E..Vk.@.@.......
           0x0010:  7f00 0001 b6be 3039 a3d1 ee54 7d61 d6f7  ......09...T}a..
           0x0020:  8018 0156 fe4a 0000 0101 080a aa2f 8641  ...V.J......./.A
           0x0030:  aa2f 8641 0000 001e 0301 0000 0000 010f  ./.A............
                                          ^^^^^^^^^^
           0x0040:  6368 6563 6b2d 636c 6965 6e74 2d69 7001  check-client-ip.
           0x0050:  0006 7f00 0001                           ......

Fixed network capture:

   12:24:26.948165 IP 127.0.0.1.46706 > 127.0.0.1.12345: Flags [P.], seq 4066280627:4066280661, ack 3148908096, win 342, options [nop,nop,TS val 2855183972 ecr 2855177690], length 34
           0x0000:  4500 0056 0538 4000 4006 3768 7f00 0001  E..V.8@.@.7h....
           0x0010:  7f00 0001 b672 3039 f25e 84b3 bbb0 8640  .....r09.^.....@
           0x0020:  8018 0156 fe4a 0000 0101 080a aa2e a664  ...V.J.........d
           0x0030:  aa2e 8dda 0000 001e 0300 0000 0114 010f  ................
                                          ^^^^^^^^^^
           0x0040:  6368 6563 6b2d 636c 6965 6e74 2d69 7001  check-client-ip.
           0x0050:  0006 7f00 0001                           ......