[Bug 1791108] Re: open-iscsi uses domainsearch instead of search for /etc/resolv.conf

[Victor Tapia]

** Patch added: "open-iscsi-cosmic.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/open-iscsi/+bug/1791108/+attachment/5190085/+files/open-iscsi-cosmic.debdiff

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Title:
  open-iscsi uses domainsearch instead of search for /etc/resolv.conf

Status in open-iscsi package in Ubuntu:
  New

Bug description:
  [Impact]

  * open-iscsi is adding "domainsearch", a non-existent configuration
  option, instead of "search" in /etc/resolv.conf. As a result, the
  search list is ignored in the clients.

  [Test case]

  * Install an ubuntu machine that uses iscsi as root.
  * Prepare the dhcp server to provide the search list to its clients. For instance, in dnsmasq:

  dhcp-option=option:domain-search,canonical.com

  * Boot the machine and check the content of /etc/resolv.conf
  - if domainsearch is present, the search list will be ignored:

  root at iscsi-xenial:/home/ubuntu# ping -c1 golem
  ping: unknown host golem

  root at iscsi-xenial:/home/ubuntu# strace ping -c1 golem 2>&1 | grep golem
  execve("/bin/ping", ["ping", "-c1", "golem"], [/* 19 vars */]) = 0
  sendto(4, "_(\1\0\0\1\0\0\0\0\0\0\5golem\0\0\1\0\1", 23, MSG_NOSIGNAL, NULL, 0) = 23
  recvfrom(4, "_(\201\203\0\1\0\0\0\0\0\0\5golem\0\0\1\0\1", 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.122.1")}, [16]) = 23
  write(2, "ping: unknown host golem\n", 25ping: unknown host golem

  - if search is present, the search list will be used:

  root at iscsi-xenial:/home/ubuntu# ping -c1 golem
  PING golem.canonical.com (91.189.89.199) 56(84) bytes of data.
  64 bytes from golem.canonical.com (91.189.89.199): icmp_seq=1 ttl=57 time=63.7 ms

  --- golem.canonical.com ping statistics ---
  1 packets transmitted, 1 received, 0% packet loss, time 0ms
  rtt min/avg/max/mdev = 63.735/63.735/63.735/0.000 ms

  root at iscsi-xenial:/home/ubuntu# strace ping -c1 golem 2>&1 | grep golem
  execve("/bin/ping", ["ping", "-c1", "golem"], [/* 19 vars */]) = 0
  sendto(4, "\1\\\1\0\0\1\0\0\0\0\0\0\5golem\tcanonical\3com"..., 37, MSG_NOSIGNAL, NULL, 0) = 37
  recvfrom(4, "\1\\\201\200\0\1\0\1\0\0\0\0\5golem\tcanonical\3com"..., 1024, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.122.1")}, [16]) = 53
  write(1, "PING golem.canonical.com (91.189"..., 145PING golem.canonical.com (91.189.89.199) 56(84) bytes of data.
  64 bytes from golem.canonical.com (91.189.89.199): icmp_seq=1 ttl=57 time=63.5 ms
  write(1, "--- golem.canonical.com ping sta"..., 157--- golem.canonical.com ping statistics ---

  [Regression potential]

  * None

  [Other info]

  * resolv.conf man page: http://man7.org/linux/man-
  pages/man5/resolv.conf.5.html

  [Original description]

  
  Having an interface file such as /run/net-eno2.conf with the following content:

  DEVICE='eno2'
  PROTO='dhcp'
  IPV4ADDR='10.10.10.10'
  IPV4BROADCAST='10.10.10.255'
  IPV4NETMASK='255.255.255.0'
  IPV4GATEWAY='10.10.10.1'
  IPV4DNS0='169.254.169.254'
  IPV4DNS1='0.0.0.0'
  HOSTNAME=''
  DNSDOMAIN='test.com'
  NISDOMAIN=''
  ROOTSERVER='169.254.169.254'
  ROOTPATH=''
  filename='/ipxe.efi'
  UPTIME='45'
  DHCPLEASETIME='86400'
  DOMAINSEARCH='test.com'

  net-interface-handler translates it to:

  nameserver 169.254.169.254
  domainsearch test.com

  instead of:

  nameserver 169.254.169.254
  search test.com

  The problem is that domainsearch is not a valid configuration option
  for /etc/resolv.conf and is ignored.

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