dhcp, dhcpv6: Add hostname and client fqdn ops

Both DHCPv4 and DHCPv6 has the capability to pass the hostname to
clients, the DHCPv4 uses option 12 (hostname) while the DHCPv6 uses option 39
(client fqdn), for some virt deployments like kubevirt is expected to
have the VirtualMachine name as the guest hostname.

This change add the following arguments:
 - -H --hostname NAME to configure the hostname DHCPv4 option(12)
 - --fqdn NAME to configure client fqdn option for both DHCPv4(81) and
   DHCPv6(39)

Signed-off-by: Enrique Llorente <ellorent@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

3 files changed, 23 insertions, 8 deletions

diff --git a/test/lib/setup b/test/lib/setup
index 580825f..ee67152 100755
--- a/test/lib/setup
+++ b/test/lib/setup
@@ -49,7 +49,7 @@ setup_passt() {
 
 	context_run passt "make clean"
 	context_run passt "make valgrind"
-	context_run_bg passt "valgrind --max-stackframe=$((4 * 1024 * 1024)) --trace-children=yes --vgdb=no --error-exitcode=1 --suppressions=test/valgrind.supp ./passt ${__opts} -s ${STATESETUP}/passt.socket -f -t 10001 -u 10001 -P ${STATESETUP}/passt.pid"
+	context_run_bg passt "valgrind --max-stackframe=$((4 * 1024 * 1024)) --trace-children=yes --vgdb=no --error-exitcode=1 --suppressions=test/valgrind.supp ./passt ${__opts} -s ${STATESETUP}/passt.socket -f -t 10001 -u 10001 -H hostname1 --fqdn fqdn1.passt.test -P ${STATESETUP}/passt.pid"
 
 	# pidfile isn't created until passt is listening
 	wait_for [ -f "${STATESETUP}/passt.pid" ]
@@ -160,11 +160,11 @@ setup_passt_in_ns() {
 	if [ ${VALGRIND} -eq 1 ]; then
 		context_run passt "make clean"
 		context_run passt "make valgrind"
-		context_run_bg passt "valgrind --max-stackframe=$((4 * 1024 * 1024)) --trace-children=yes --vgdb=no --error-exitcode=1 --suppressions=test/valgrind.supp ./passt -f ${__opts} -s ${STATESETUP}/passt.socket -t 10001,10011,10021,10031 -u 10001,10011,10021,10031 -P ${STATESETUP}/passt.pid --map-host-loopback ${__map_ns4} --map-host-loopback ${__map_ns6}"
+		context_run_bg passt "valgrind --max-stackframe=$((4 * 1024 * 1024)) --trace-children=yes --vgdb=no --error-exitcode=1 --suppressions=test/valgrind.supp ./passt -f ${__opts} -s ${STATESETUP}/passt.socket -H hostname1 --fqdn fqdn1.passt.test -t 10001,10011,10021,10031 -u 10001,10011,10021,10031 -P ${STATESETUP}/passt.pid --map-host-loopback ${__map_ns4} --map-host-loopback ${__map_ns6}"
 	else
 		context_run passt "make clean"
 		context_run passt "make"
-		context_run_bg passt "./passt -f ${__opts} -s ${STATESETUP}/passt.socket -t 10001,10011,10021,10031 -u 10001,10011,10021,10031 -P ${STATESETUP}/passt.pid --map-host-loopback ${__map_ns4} --map-host-loopback ${__map_ns6}"
+		context_run_bg passt "./passt -f ${__opts} -s ${STATESETUP}/passt.socket -H hostname1 --fqdn fqdn1.passt.test -t 10001,10011,10021,10031 -u 10001,10011,10021,10031 -P ${STATESETUP}/passt.pid --map-host-loopback ${__map_ns4} --map-host-loopback ${__map_ns6}"
 	fi
 	wait_for [ -f "${STATESETUP}/passt.pid" ]
 
@@ -243,7 +243,7 @@ setup_two_guests() {
 	[ ${TRACE} -eq 1 ] && __opts="${__opts} --trace"
 	[ ${VHOST_USER} -eq 1 ] && __opts="${__opts} --vhost-user"
 
-	context_run_bg passt_1 "./passt -s ${STATESETUP}/passt_1.socket -P ${STATESETUP}/passt_1.pid -f ${__opts} -t 10001 -u 10001"
+	context_run_bg passt_1 "./passt -s ${STATESETUP}/passt_1.socket -P ${STATESETUP}/passt_1.pid -f ${__opts} --fqdn fqdn1.passt.test -H hostname1 -t 10001 -u 10001"
 	wait_for [ -f "${STATESETUP}/passt_1.pid" ]
 
 	__opts=
@@ -252,7 +252,7 @@ setup_two_guests() {
 	[ ${TRACE} -eq 1 ] && __opts="${__opts} --trace"
 	[ ${VHOST_USER} -eq 1 ] && __opts="${__opts} --vhost-user"
 
-	context_run_bg passt_2 "./passt -s ${STATESETUP}/passt_2.socket -P ${STATESETUP}/passt_2.pid -f ${__opts} -t 10004 -u 10004"
+	context_run_bg passt_2 "./passt -s ${STATESETUP}/passt_2.socket -P ${STATESETUP}/passt_2.pid -f ${__opts} --hostname hostname2 --fqdn fqdn2 -t 10004 -u 10004"
 	wait_for [ -f "${STATESETUP}/passt_2.pid" ]
 
 	__vmem="$((${MEM_KIB} / 1024 / 4))"
diff --git a/test/passt.mbuto b/test/passt.mbuto
index d4d57cb..e45a284 100755
--- a/test/passt.mbuto
+++ b/test/passt.mbuto
@@ -13,7 +13,7 @@
 PROGS="${PROGS:-ash,dash,bash ip mount ls insmod mkdir ln cat chmod lsmod
        modprobe find grep mknod mv rm umount jq iperf3 dhclient hostname
        sed tr chown sipcalc cut socat dd strace ping tail killall sleep sysctl
-       nproc tcp_rr tcp_crr udp_rr which tee seq bc sshd ssh-keygen cmp tcpdump}"
+       nproc tcp_rr tcp_crr udp_rr which tee seq bc sshd ssh-keygen cmp tcpdump env}"
 
 # OpenSSH 9.8 introduced split binaries, with sshd being the daemon, and
 # sshd-session the per-session program. We need the latter as well, and the path
@@ -41,6 +41,7 @@ FIXUP="${FIXUP}"'
 #!/bin/sh
 LOG=/var/log/dhclient-script.log
 echo \${reason} \${interface} >> \$LOG
+env >> \$LOG
 set >> \$LOG
 
 [ -n "\${new_interface_mtu}" ]       && ip link set dev \${interface} mtu \${new_interface_mtu}
@@ -54,7 +55,8 @@ set >> \$LOG
 [ -n "\${new_ip6_address}" ]         && ip addr add \${new_ip6_address}/\${new_ip6_prefixlen} dev \${interface}
 [ -n "\${new_dhcp6_name_servers}" ]  && for d in \${new_dhcp6_name_servers}; do echo "nameserver \${d}%\${interface}" >> /etc/resolv.conf; done
 [ -n "\${new_dhcp6_domain_search}" ] && (printf "search"; for d in \${new_dhcp6_domain_search}; do printf " %s" "\${d}"; done; printf "\n") >> /etc/resolv.conf
-[ -n "\${new_host_name}" ]           && hostname "\${new_host_name}"
+[ -n "\${new_host_name}" ]           && echo "\${new_host_name}" > /tmp/new_host_name
+[ -n "\${new_fqdn_fqdn}" ]           && echo "\${new_fqdn_fqdn}" > /tmp/new_fqdn_fqdn
 exit 0
 EOF
 	chmod 755 /sbin/dhclient-script
diff --git a/test/passt/dhcp b/test/passt/dhcp
index 9925ab9..145f1ba 100644
--- a/test/passt/dhcp
+++ b/test/passt/dhcp
@@ -11,7 +11,7 @@
 # Copyright (c) 2021 Red Hat GmbH
 # Author: Stefano Brivio <sbrivio@redhat.com>
 
-gtools	ip jq dhclient sed tr
+gtools	ip jq dhclient sed tr hostname
 htools	ip jq sed tr head
 
 test	Interface name
@@ -47,7 +47,16 @@ gout	SEARCH sed 's/\. / /g' /etc/resolv.conf | sed 's/\.$//g' | sed -n 's/^searc
 hout	HOST_SEARCH sed 's/\. / /g' /etc/resolv.conf | sed 's/\.$//g' | sed -n 's/^search \(.*\)/\1/p' | tr ' \n' ',' | sed 's/,$//;s/$/\n/'
 check	[ "__SEARCH__" = "__HOST_SEARCH__" ]
 
+test	DHCP: Hostname
+gout	NEW_HOST_NAME cat /tmp/new_host_name
+check	[ "__NEW_HOST_NAME__" = "hostname1" ]
+
+test	DHCP: Client FQDN
+gout	NEW_FQDN_FQDN cat /tmp/new_fqdn_fqdn
+check	[ "__NEW_FQDN_FQDN__" = "fqdn1.passt.test" ]
+
 test	DHCPv6: address
+guest	rm /tmp/new_fqdn_fqdn
 guest	/sbin/dhclient -6 __IFNAME__
 # Wait for DAD to complete
 guest	while ip -j -6 addr show tentative | jq -e '.[].addr_info'; do sleep 0.1; done
@@ -70,3 +79,7 @@ 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/'
 hout	HOST_SEARCH6 sed 's/\. / /g' /etc/resolv.conf | sed 's/\.$//g' | sed -n 's/^search \(.*\)/\1/p' | tr ' \n' ',' | sed 's/,$//;s/$/\n/'
 check	[ "__SEARCH6__" = "__HOST_SEARCH6__" ]
+
+test	DHCPv6: Hostname
+gout	NEW_FQDN_FQDN cat /tmp/new_fqdn_fqdn
+check	[ "__NEW_FQDN_FQDN__" = "fqdn1.passt.test" ]