[PATCH 06/18] tests: Handle the case of a nameserver on host localhost

[David Gibson <david@gibson.dropbear.id.au>]

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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(a)gibson.dropbear.id.au>
---
 test/dhcp/passt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/dhcp/passt b/test/dhcp/passt
index a5491bc..3d2e939 100644
--- a/test/dhcp/passt
+++ b/test/dhcp/passt
@@ -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/'
-- 
@@ -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/'
-- 
2.36.1