[Bug 1813822] [NEW] Improve log messages during iSCSI login failures (specially related to iSCSI redirection)

[Fabio Augusto Miranda Martins]

Public bug reported:

When an iSCSI Storage (eg.: SolidFire) uses iSCSI redirects, the initial
login fails, but it just logs "Login authentication failed with target",
while the tcpdump actually shows what exactly was happening. For
example:

1. Ubuntu tries to login to the Target IP (10.5.0.26):
24	8.858756	10.5.0.7	10.5.0.26	iSCSI	252	Login Command

2. The Storage (10.5.0.26) replies with:
27	8.860318	10.5.0.26	10.5.0.7	iSCSI	148	Login Response (Target moved temporarily)

The iSCSI packet contains "TargetAddress=10.5.0.18:3260", which is the
new iSCSI Portal that we should use:

3. Ubuntu then tries to login to the new portal:
50	9.377491	10.5.0.7	10.5.0.18	iSCSI	252	Login Command

4. Which succeeds:
57	9.379082	10.5.0.18	10.5.0.7	iSCSI	156	Login Response (Success)


But in /var/log/syslog, the only message that is displayed is:

Jan 22 16:01:52 xenial-initiator iscsid: Login authentication failed
with target iqn.1993-08.org.debian:01:4df860e415a6:redirect

As an enhancement request, it would be good to see the login redirection
being logged into syslog. The same behavior applies to Trusty, Xenial
and Bionic.

The same request has been made upstream, but it has been considered low
priority so far: https://github.com/open-iscsi/open-iscsi/issues/117

** Affects: open-iscsi (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1813822

Title:
  Improve log messages during iSCSI login failures (specially related to
  iSCSI redirection)

Status in open-iscsi package in Ubuntu:
  New

Bug description:
  When an iSCSI Storage (eg.: SolidFire) uses iSCSI redirects, the
  initial login fails, but it just logs "Login authentication failed
  with target", while the tcpdump actually shows what exactly was
  happening. For example:

  1. Ubuntu tries to login to the Target IP (10.5.0.26):
  24	8.858756	10.5.0.7	10.5.0.26	iSCSI	252	Login Command

  2. The Storage (10.5.0.26) replies with:
  27	8.860318	10.5.0.26	10.5.0.7	iSCSI	148	Login Response (Target moved temporarily)

  The iSCSI packet contains "TargetAddress=10.5.0.18:3260", which is the
  new iSCSI Portal that we should use:

  3. Ubuntu then tries to login to the new portal:
  50	9.377491	10.5.0.7	10.5.0.18	iSCSI	252	Login Command

  4. Which succeeds:
  57	9.379082	10.5.0.18	10.5.0.7	iSCSI	156	Login Response (Success)

  
  But in /var/log/syslog, the only message that is displayed is:

  Jan 22 16:01:52 xenial-initiator iscsid: Login authentication failed
  with target iqn.1993-08.org.debian:01:4df860e415a6:redirect

  As an enhancement request, it would be good to see the login
  redirection being logged into syslog. The same behavior applies to
  Trusty, Xenial and Bionic.

  The same request has been made upstream, but it has been considered
  low priority so far: https://github.com/open-iscsi/open-
  iscsi/issues/117

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