#!/bin/sh
#
# SPDX-License-Identifier: AGPL-3.0-or-later
#
# PASST - Plug A Simple Socket Transport
#  for qemu/UNIX domain socket mode
#
# PASTA - Pack A Subtle Tap Abstraction
#  for network namespace/tap device mode
#
# test/lib/setup - Set up and tear down passt and pasta environments
#
# Copyright (c) 2021 Red Hat GmbH
# Author: Stefano Brivio <sbrivio@redhat.com>

VCPUS="$( [ $(nproc) -ge 8 ] && echo 4 || echo $(( $(nproc) / 2 + 1 )) )"
__mem_kib="$(sed -n 's/MemTotal:[ ]*\([0-9]*\) kB/\1/p' /proc/meminfo)"
VMEM="$((${__mem_kib} / 1024 / 8))"

# setup_build() - Set up pane layout for build tests
setup_build() {
	MODE=build

	layout_host
}

# setup_passt() - Build guest initrd with mbuto, start qemu and passt
setup_passt() {
	MODE=passt

	layout_passt

	__mbuto_dir="$(mktemp -d)"
	pane_run GUEST "git -C ${__mbuto_dir} clone https://mbuto.lameexcu.se/mbuto/"
	pane_wait GUEST

	pane_run GUEST "${__mbuto_dir}/mbuto/mbuto -p passt -c lz4 -f mbuto.img"
	pane_wait GUEST

	rm -rf "${__mbuto_dir}"

	# Ports:
	#
	#              guest    |        host
	#         --------------|---------------------
	#  10001     as server  |  forwarded to guest
	#  10003                |      as server

	__opts=
	[ ${PCAP} -eq 1 ] && __opts="${__opts} -p /tmp/passt.pcap"
	[ ${DEBUG} -eq 1 ] && __opts="${__opts} -d"
	pane_run PASST "./passt ${__opts} -f -t 10001 -u 10001"
	sleep 1

	pane_run GUEST './qrap 5 kvm -m '${VMEM}' -cpu host -smp '${VCPUS}	\
		'-kernel' "/boot/vmlinuz-$(uname -r)"			\
		'-initrd mbuto.img -nographic -serial stdio'		\
		'-nodefaults '						\
		'-append "console=ttyS0 mitigations=off apparmor=0 '	\
		'virtio-net.napi_tx=1"'					\
		"-device virtio-net-pci,netdev=hostnet0,x-txburst=16384"\
		"-netdev socket,fd=5,id=hostnet0"
	pane_wait GUEST
}

# setup_pasta() - Create a network and user namespace, connect pasta to it
setup_pasta() {
	MODE=pasta

	layout_pasta

	pane_run NS "unshare -rUn /bin/sh "
	pane_wait NS

	pane_run NS 'echo $$'
	pane_wait NS
	__pasta_pid="$(pane_parse NS)"

	# Ports:
	#
	#                 ns        |         host
	#         ------------------|---------------------
	#  10002      as server     |    spliced to ns
	#  10003   spliced to init  |      as server

	__opts=
	[ ${PCAP} -eq 1 ] && __opts="${__opts} -p /tmp/pasta.pcap"
	[ ${DEBUG} -eq 1 ] && __opts="${__opts} -d"

	pane_run PASST "./pasta ${__opts} -f -t 10002 -T 10003 -u 10002 -U 10003 ${__pasta_pid}"
	sleep 1
}

# setup_passt_in_ns() - Set up namespace (with pasta), run qemu and passt into it
setup_passt_in_ns() {
	MODE=passt_in_ns

	layout_passt_in_pasta

	# Ports:
	#
	#             guest    |         ns         |       host
	#         -------------|--------------------|-----------------
	#  10001    as server  | forwarded to guest |  spliced to ns
	#  10002               |     as server      |  spliced to ns
	#  10003               |   spliced to init  |    as server
	#  10011    as server  | forwarded to guest |  spliced to ns
	#  10012               |     as server      |  spliced to ns
	#  10013               |   spliced to init  |    as server

	__opts=
	[ ${PCAP} -eq 1 ] && __opts="${__opts} -p /tmp/pasta_with_passt.pcap"
	[ ${DEBUG} -eq 1 ] && __opts="${__opts} -d"

	pane_run PASST "./pasta ${__opts} -t 10001,10002,10011,10012 -T 10003,10013 -u 10001,10002,10011,10012 -U 10003,10013"
	sleep 1
	pane_run PASST ''
	pane_wait PASST
	pane_run PASST 'echo $$'
	pane_wait PASST
	__ns_pid="$(pane_parse PASST)"

	pane_run GUEST "nsenter -t ${__ns_pid} -U -n --preserve-credentials"
	pane_run NS "nsenter -t ${__ns_pid} -U -n --preserve-credentials"
	pane_wait GUEST
	pane_wait NS

	pane_run NS "ip -j li sh | jq -rM '.[] | select(.link_type == \"ether\").ifname'"
	pane_wait NS
	__ifname="$(pane_parse NS)"
	pane_run NS "/sbin/udhcpc -i ${__ifname}"
	pane_wait NS
	sleep 2
	pane_run NS "/sbin/dhclient -6 ${__ifname}"
	pane_wait NS

	__opts=
	[ ${PCAP} -eq 1 ] && __opts="${__opts} -p /tmp/passt_in_pasta.pcap"
	[ ${DEBUG} -eq 1 ] && __opts="${__opts} -d"

	#pane_run PASST "valgrind --max-stackframe=3000000 ./passt -f ${__opts} -t 10001,10011 -u 10001,10011"
	pane_run PASST "./passt -f ${__opts} -t 10001,10011 -u 10001,10011"
	sleep 1

	pane_run GUEST './qrap 5 kvm -m '${VMEM}' -cpu host -smp '${VCPUS}	\
		'-kernel' "/boot/vmlinuz-$(uname -r)"			\
		'-initrd mbuto.img -nographic -serial stdio'		\
		'-nodefaults '						\
		'-append "console=ttyS0 mitigations=off apparmor=0 '	\
		'virtio-net.napi_tx=1"'					\
		"-device virtio-net-pci,netdev=hostnet0,x-txburst=131072"\
		"-netdev socket,fd=5,id=hostnet0"
	pane_wait GUEST
}

# setup_two_guests() - Set up two namespace, run qemu and passt in both of them
setup_two_guests() {
	MODE=passt_in_ns

	layout_two_guests

	# Ports:
	#
	#         guest #1  |  guest #2 |   ns #1   |    ns #2   |    host
	#         --------- |-----------|-----------|------------|------------
	#  10001  as server |           | to guest  |  to init   |  to ns #1
	#  10002            |           | as server |            |  to ns #1
	#  10003            |           |  to init  |  to init   |  as server
	#  10004            | as server |  to init  |  to guest  |  to ns #2
	#  10005            |           |           |  as server |  to ns #2

	__opts=
	[ ${PCAP} -eq 1 ] && __opts="${__opts} -p /tmp/pasta_1.pcap"
	[ ${DEBUG} -eq 1 ] && __opts="${__opts} -d"
	pane_run PASST_1 "./pasta ${__opts} -t 10001,10002 -T 10003,10004 -u 10001,10002 -U 10003,10004"

	__opts=
	[ ${PCAP} -eq 1 ] && __opts="${__opts} -p /tmp/pasta_2.pcap"
	[ ${DEBUG} -eq 1 ] && __opts="${__opts} -d"
	pane_run PASST_2 "./pasta ${__opts} -t 10004,10005 -T 10003,10001 -u 10004,10005 -U 10003,10001"

	sleep 1
	pane_run PASST_1 ''
	pane_run PASST_2 ''

	pane_wait PASST_1
	pane_wait PASST_2
	pane_run PASST_1 'echo $$'
	pane_run PASST_2 'echo $$'
	pane_wait PASST_1
	pane_wait PASST_2
	__ns1_pid="$(pane_parse PASST_1)"
	__ns2_pid="$(pane_parse PASST_2)"

	pane_run GUEST_1 "nsenter -t ${__ns1_pid} -U -n --preserve-credentials"
	pane_run GUEST_2 "nsenter -t ${__ns2_pid} -U -n --preserve-credentials"

	pane_run PASST_1 "ip -j li sh | jq -rM '.[] | select(.link_type == \"ether\").ifname'"
	pane_wait PASST_1
	__ifname="$(pane_parse PASST_1)"

	pane_run GUEST_1 "/sbin/udhcpc -i ${__ifname}"
	pane_run GUEST_2 "/sbin/udhcpc -i ${__ifname}"
	pane_wait GUEST_1
	pane_wait GUEST_2
	sleep 2
	pane_run GUEST_1 "/sbin/dhclient -6 ${__ifname}"
	pane_run GUEST_2 "/sbin/dhclient -6 ${__ifname}"
	pane_wait GUEST_1
	pane_wait GUEST_2

	__opts=
	[ ${PCAP} -eq 1 ] && __opts="${__opts} -p /tmp/passt_1.pcap"
	[ ${DEBUG} -eq 1 ] && __opts="${__opts} -d"
	pane_run PASST_1 "./passt -f ${__opts} -t 10001 -u 10001"
	sleep 1

	__opts=
	[ ${PCAP} -eq 1 ] && __opts="${__opts} -p /tmp/passt_2.pcap"
	[ ${DEBUG} -eq 1 ] && __opts="${__opts} -d"
	pane_run PASST_2 "./passt -f ${__opts} -t 10004 -u 10004"

	pane_run GUEST_2 'cp mbuto.img mbuto_2.img'
	pane_wait GUEST_2

	pane_run GUEST_1 './qrap 5 kvm -m '${VMEM}' -cpu host -smp '${VCPUS}	\
		'-kernel' "/boot/vmlinuz-$(uname -r)"			\
		'-initrd mbuto.img -nographic -serial stdio'		\
		'-nodefaults '						\
		'-append "console=ttyS0 mitigations=off apparmor=0 '	\
		'virtio-net.napi_tx=1"'					\
		"-device virtio-net-pci,netdev=hostnet0,x-txburst=16384"\
		"-netdev socket,fd=5,id=hostnet0"
	pane_run GUEST_2 './qrap 5 kvm -m '${VMEM}' -cpu host -smp '${VCPUS}	\
		'-kernel' "/boot/vmlinuz-$(uname -r)"			\
		'-initrd mbuto_2.img -nographic -serial stdio'		\
		'-nodefaults '						\
		'-append "console=ttyS0 mitigations=off apparmor=0 '	\
		'virtio-net.napi_tx=1"'					\
		"-device virtio-net-pci,netdev=hostnet0,x-txburst=16384"\
		"-netdev socket,fd=5,id=hostnet0"
	pane_wait GUEST_1
	pane_wait GUEST_2
}

# teardown_passt() - Kill qemu and passt
teardown_passt() {
	tmux send-keys -t ${PANE_PASST} "C-c"
	pane_wait PASST
	tmux send-keys -t ${PANE_GUEST} "C-c"
	pane_wait GUEST
}

# teardown_passt() - Exit namespace, kill pasta process
teardown_pasta() {
	tmux send-keys -t ${PANE_PASST} "C-c"
	pane_wait PASST
	tmux send-keys -t ${PANE_NS} "C-d"
	pane_wait NS
}

# teardown_passt_in_ns() - Exit namespace, kill qemu, passt and pasta
teardown_passt_in_ns() {
	tmux send-keys -t ${PANE_GUEST} "C-c"
	pane_wait GUEST
	tmux send-keys -t ${PANE_GUEST} "C-d"

	tmux send-keys -t ${PANE_PASST} "C-c"
	pane_wait PASST
	tmux send-keys -t ${PANE_PASST} "C-d"

	tmux send-keys -t ${PANE_NS} "C-d"

	pane_wait GUEST
	pane_wait NS
	pane_wait PASST
}

# teardown_two_guests() - Exit namespaces, kill qemu processes, passt and pasta
teardown_two_guests() {
	tmux send-keys -t ${PANE_GUEST_1} "C-c"
	pane_wait GUEST_1
	tmux send-keys -t ${PANE_GUEST_1} "C-d"

	tmux send-keys -t ${PANE_GUEST_2} "C-c"
	pane_wait GUEST_2
	tmux send-keys -t ${PANE_GUEST_2} "C-d"

	tmux send-keys -t ${PANE_PASST_1} "C-c"
	pane_wait PASST_1
	tmux send-keys -t ${PANE_PASST_1} "C-d"

	tmux send-keys -t ${PANE_PASST_2} "C-c"
	pane_wait PASST_2
	tmux send-keys -t ${PANE_PASST_2} "C-d"

	tmux send-keys -t ${PANE_NS_1} "C-d"
	tmux send-keys -t ${PANE_NS_2} "C-d"

	pane_wait GUEST_1
	pane_wait GUEST_2
	ns_1_wait
	ns_2_wait
	pane_wait PASST_1
	pane_wait PASST_2
}

# teardown_demo_passt() - Exit namespace, kill qemu, passt and pasta
teardown_demo_passt() {
	tmux send-keys -t ${PANE_GUEST} "C-c"
	pane_wait GUEST
	tmux send-keys -t ${PANE_GUEST} "C-d"

	tmux send-keys -t ${PANE_HOST} "C-d"

	tmux send-keys -t ${PANE_PASST} "C-c"
	pane_wait PASST
	tmux send-keys -t ${PANE_PASST} "C-d"

	pane_wait GUEST
	pane_wait HOST
	pane_wait PASST
}

# teardown_demo_pasta() - Exit namespace from remaining pane
teardown_demo_pasta() {
	tmux send-keys -t ${PANE_NS} "C-d"
	pane_wait NS
}

# setup() - Run setup_*() functions
# $*:	Suffix list of setup_*() functions to be called
setup() {
	for arg do
		eval setup_${arg}
	done
}

# teardown() - Run teardown_*() functions
# $*:	Suffix list of teardown_*() functions to be called
teardown() {
	for arg do
		eval teardown_${arg}
	done
}