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tests: Handle the case of a nameserver on host localhost

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We previously introduced a change to passt to handle the case where the
host machine is its own nameserver - so resolv.conf points to 127.0.0.1.
In this case we advertize the gateway as the DNS server for the guest,
which in turn will be redirected back to the host by existing passt logic.

The dhcp/passt doesn't handle this case correctly, so add some logic to
account for it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2022-07-15 15:21:29 +10:00 committed by Stefano Brivio
parent 92b341f8d2
commit a47ac6160b
1 changed files with 2 additions and 2 deletions
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test/dhcp/passt
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@ -37,7 +37,7 @@ check [ __MTU__ = 65520 ]
test DHCP: DNS
gout DNS sed -n 's/^nameserver \([0-9]*\.\)\(.*\)/\1\2/p' /etc/resolv.conf | tr '\n' ',' | sed 's/,$//;s/$/\n/'
hout HOST_DNS sed -n 's/^nameserver \([0-9]*\.\)\(.*\)/\1\2/p' /etc/resolv.conf | head -n3 | tr '\n' ',' | sed 's/,$//;s/$/\n/'
check [ "__DNS__" = "__HOST_DNS__" ]
check [ "__DNS__" = "__HOST_DNS__" ] || [ "__DNS__" = "__HOST_GW__" -a "__HOST_DNS__" = "127.0.0.1" ]
# FQDNs should be terminated by dots, but the guest DHCP client might omit them:
# strip them first
@ -61,7 +61,7 @@ check [ "__GW6__" = "__HOST_GW6__" ]
test DHCPv6: DNS
gout DNS6 sed -n 's/^nameserver \([^:]*:\)\([^%]*\).*/\1\2/p' /etc/resolv.conf | tr '\n' ',' | sed 's/,$//;s/$/\n/'
hout HOST_DNS6 sed -n 's/^nameserver \([^:]*:\)\([^%]*\).*/\1\2/p' /etc/resolv.conf | tr '\n' ',' | sed 's/,$//;s/$/\n/'
check [ "__DNS6__" = "__HOST_DNS6__" ]
check [ "__DNS6__" = "__HOST_DNS6__" ] || [ "__DNS6__" = "__HOST_GW6__" -a "__HOST_DNS6__" = "::1" ]
test DHCPv6: search list
gout SEARCH6 sed 's/\. / /g' /etc/resolv.conf | sed 's/\.$//g' | sed -n 's/^search \(.*\)/\1/p' | tr ' \n' ',' | sed 's/,$//;s/$/\n/'