[Bug 2096914] Re: rsync 3.3.0-1ubuntu0.1 patch breaks IPv6 over SSH: "ssh: Could not resolve hostname x: Name or service not known"

[jehon]

I can add that for some reasons, ipv6 is not compiled in anymore in
3.3.0 (see capabilities in rsync --version):

rsync  version 3.3.0  protocol version 31
Copyright (C) 1996-2024 by Andrew Tridgell, Wayne Davison, and others.
Web site: https://rsync.samba.org/
Capabilities:
    64-bit files, 64-bit inums, 64-bit timestamps, 64-bit long ints,
    socketpairs, symlinks, symtimes, hardlinks, hardlink-specials,
    hardlink-symlinks, *****no IPv6****, atimes, batchfiles, inplace, append, ACLs,
    xattrs, optional secluded-args, iconv, prealloc, stop-at, no crtimes
Optimizations:
    SIMD-roll, no asm-roll, openssl-crypto, no asm-MD5
Checksum list:
    xxh128 xxh3 xxh64 (xxhash) md5 md4 sha1 none
Compress list:
    zstd lz4 zlibx zlib none
Daemon auth list:
    sha512 sha256 sha1 md5 md4

rsync comes with ABSOLUTELY NO WARRANTY.  This is free software, and you
are welcome to redistribute it under certain conditions.  See the GNU
General Public Licence for details.


dpkg version:

ii  rsync                                         3.3.0-1ubuntu0.1
amd64        fast, versatile, remote (and local) file-copying tool

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https://bugs.launchpad.net/bugs/2096914

Title:
  rsync 3.3.0-1ubuntu0.1 patch breaks IPv6 over SSH: "ssh: Could not
  resolve hostname x: Name or service not known"

Status in rsync package in Ubuntu:
  Confirmed

Bug description:
  The security upgrade of rsync from 3.3.0-1 (oracular) to
  3.3.0-1ubuntu0.1 (oracular-updates) breaks my current rsync over SSH
  backup for an IPv6-only target host!:

      rsync -a --delete -s --rsh="ssh -vvvv" -p 22 /tmp/emptydir/
  admin at ipv6only.reachable.nas:/share/CACHEDEV3_DATA/targetdir

  
  3.3.0-1ubuntu0.1 outputs here:

  OpenSSH_9.7p1 Ubuntu-7ubuntu4.1, OpenSSL 3.3.1 4 Jun 2024
  debug1: Reading configuration data /etc/ssh/ssh_config
  [...]
  debug3: resolve_host: lookup ipv6only.reachable.nas:22
  ssh: Could not resolve hostname ipv6only.reachable.nas: Name or service not known
  rsync: connection unexpectedly closed (0 bytes received so far) [sender]
  rsync error: unexplained error (code 255) at io.c(232) [sender=3.3.0]

  
  while 3.3.0-1 outputs here:

  OpenSSH_9.7p1 Ubuntu-7ubuntu4.1, OpenSSL 3.3.1 4 Jun 2024
  debug1: Reading configuration data /etc/ssh/ssh_config
  [...]
  debug3: resolve_host: lookup ipv6only.reachable.nas:22
  debug3: channel_clear_timeouts: clearing
  debug3: ssh_connect_direct: entering
  debug1: Connecting to ipv6only.reachable.nas [2001:9e8:…] port 22.

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