[Bug 1883957] Re: socat-1.7.3.3 (focal) termios options incorrectly applied to the second address

[Frank Heimes]

*** This bug is a duplicate of bug 2056485 ***
    https://bugs.launchpad.net/bugs/2056485

** This bug has been marked a duplicate of bug 2056485
   Behaviour of socat in Ubuntu 20.04 unexpected

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Title:
  socat-1.7.3.3 (focal) termios options incorrectly applied to the
  second address

Status in socat package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  the socat version in Focal (1.7.3.3) breaks certain applications (i.e.
  qemu serial console), when using raw mode or disabling echo (required
  for serial consoles). Example: start socket in listening mode: "qemu-
  system-x86_64 -serial unix:/tmp/socket,server", connect with socat:

  /usr/bin/socat -ddd STDIO,raw,echo=0,escape=0x1d UNIX-CONNECT:/tmp/socket
  2020/06/17 17:08:19 socat[26254] I setting option "raw"
  2020/06/17 17:08:19 socat[26254] I setting option "echo" to 0
  2020/06/17 17:08:19 socat[26254] I setting option "escape" to 29
  2020/06/17 17:08:19 socat[26254] N reading from and writing to stdio
  2020/06/17 17:08:19 socat[26254] N opening connection to AF=1 "/tmp/socket"
  2020/06/17 17:08:19 socat[26254] I socket(1, 1, 0) -> 5
  2020/06/17 17:08:19 socat[26254] E tcsetattr(5, TCSADRAIN, 0x556ef9be59c0): Inappropriate ioctl for device
  2020/06/17 17:08:19 socat[26254] N exit(1)
  2020/06/17 17:08:19 socat[26254] I shutdown(5, 2)

  According to the Changelog from socat-1.7.3.4[1] this is a know
  problem (Under certain circumstances, termios options of the first
  address were applied to the second address, resulting in error
  "Inappropriate ioctl for device"). The upstream commit[2] fixes this
  issue (also released in socat-1.7.3.4).

  Thanks, Sascha.

  [1] http://www.dest-unreach.org/socat/doc/CHANGES
  [2] https://repo.or.cz/socat.git/commit/5ebf36038f3960798e769bff5646e755a91a1119

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