diff options
Diffstat (limited to 'doc/demo.sh')
| -rwxr-xr-x | doc/demo.sh | 340 |
1 files changed, 231 insertions, 109 deletions
diff --git a/doc/demo.sh b/doc/demo.sh index f49110a..d39a10e 100755 --- a/doc/demo.sh +++ b/doc/demo.sh @@ -4,122 +4,244 @@ # # PASST - Plug A Simple Socket Transport # -# demo.sh - Set up namespaces, addresses and routes to show PASST functionality +# demo.sh - Set up namespace with pasta, start qemu and passt, step by step # -# Copyright (c) 2020-2021 Red Hat GmbH +# Copyright (c) 2020-2022 Red Hat GmbH # Author: Stefano Brivio <sbrivio@redhat.com> -get_token() { - IFS=' ' - __next=0 - for __token in ${@}; do - [ ${__next} -eq 2 ] && echo "${__token}" && return - [ "${__token}" = "${1}" ] && __next=$((__next + 1)) - done - unset IFS +# mbuto_profile() - Profile for https://mbuto.sh/, sourced, return after setting +mbuto_profile() { + PROGS="${PROGS:-ash,dash,bash ip mount ls ln chmod insmod mkdir sleep + lsmod modprobe find grep mknod mv rm umount iperf3 dhclient cat + hostname chown socat dd strace ping killall sysctl wget,curl}" + + KMODS="${KMODS:- virtio_net virtio_pci}" + + LINKS="${LINKS:- + ash,dash,bash /init + ash,dash,bash /bin/sh}" + + DIRS="${DIRS} /tmp /sbin /var/log /var/run /var/lib" + + # shellcheck disable=SC2016 + FIXUP="${FIXUP}"' + cat > /sbin/dhclient-script << EOF +#!/bin/sh + +[ -n "\${new_interface_mtu}" ] && ip link set dev \${interface} mtu \${new_interface_mtu} + +[ -n "\${new_ip_address}" ] && ip addr add \${new_ip_address}/\${new_subnet_mask} dev \${interface} +[ -n "\${new_routers}" ] && for r in \${new_routers}; do ip route add default via \${r} dev \${interface}; done +[ -n "\${new_domain_name_servers}" ] && for d in \${new_domain_name_servers}; do echo "nameserver \${d}" >> /etc/resolv.conf; done +[ -n "\${new_domain_name}" ] && echo "search \${new_domain_name}" >> /etc/resolf.conf +[ -n "\${new_domain_search}" ] && (printf "search"; for d in \${new_domain_search}; do printf " %s" "\${d}"; done; printf "\n") >> /etc/resolv.conf +[ -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}" +exit 0 +EOF + + chmod 755 /sbin/dhclient-script + + mkdir -p /etc/dhcp + echo "timeout 3;" > /etc/dhcp/dhclient.conf + + ln -s /sbin /usr/sbin + :> /etc/fstab + + echo + echo "The guest is up and running. Networking is not configured yet:" + echo + echo "$ ip address show" + echo + ip address show + echo + echo "...the next step will take care of that." + read x + + echo "$ ip link set dev eth0 up" + ip link set dev eth0 up + sleep 3 + echo "$ /sbin/dhclient -4 -1" + /sbin/dhclient -4 -1 + sleep 2 + echo "$ /sbin/dhclient -6 -1" + /sbin/dhclient -6 -1 + sleep 2 + echo + echo "$ ip address show" + ip address show + echo + echo "$ ip route show" + ip route show + echo + echo "...done." + read x + + echo "Checking connectivity..." + echo + echo "$ wget --no-check-certificate https://passt.top/ || curl -k https://passt.top/" + wget --no-check-certificate https://passt.top/ || curl -k https://passt.top/ + echo "...done." + read x + + echo "An interactive shell will start now. When you are done," + echo "use ^C to terminate the guest and exit the demo." + echo + + sh +m +' } -ipv6_dev() { get_token "dev" $(ip -o -6 route show default | grep via); } -ipv6_devaddr() { get_token "inet6" $(ip -o -6 addr show dev "${1}" scope global); } -ipv6_ll_addr() { get_token "inet6" $(ip -o -6 addr show dev "${1}" scope link); } -ipv6_mask() { echo ${1#*/}; } -ipv6_mangle() { - IFS=':' - __c=0 - for __16b in ${1%%/*}; do - if [ ${__c} -lt 7 ]; then - printf "${__16b}:" - else - printf "%04x\n" $((0xabc0 + ${2})) && break - fi - __c=$((__c + 1)) - done - unset IFS +[ "${0##*/}" = "mbuto" ] && mbuto_profile && return 0 + +# cmd() - Show command being executed, then run it +# $@: Command and arguments +cmd() { + echo "$" "$@" + "$@" +} + +# next() - Go to next step once a key is pressed, sets $KEY +next() { + KEY="$(dd ibs=1 count=1 2>/dev/null)" + echo } -ndp_setup() { - sysctl -w net.ipv6.conf.all.proxy_ndp=1 - ip -6 neigh add proxy "${1}" dev "$(ipv6_dev)" +# cleanup() - Terminate pasta and passt, clean up, restore TTY settings +cleanup() { + [ -f "${DEMO_DIR}/pasta.pid" ] && kill "$(cat "${DEMO_DIR}/pasta.pid")" + [ -f "${DEMO_DIR}/passt.pid" ] && kill "$(cat "${DEMO_DIR}/passt.pid")" + rm -rf "${DEMO_DIR}" 2>/dev/null + [ -n "${STTY_BACKUP}" ] && stty "${STTY_BACKUP}" +} + +# start_pasta_delayed() - Start pasta once $DEMO_DIR/pasta.wait is gone +start_pasta_delayed() { + trap '' EXIT + while [ -d "${DEMO_DIR}/pasta.wait" ]; do sleep 1; done + cmd pasta --config-net -P "${DEMO_DIR}/pasta.pid" \ + "$(cat "${DEMO_DIR}/shell.pid")" + echo + echo "...pasta is running." + exit 0 +} - for i in `seq 1 63`; do - __neigh="$(ipv6_mangle ${1} ${i})" - if [ "${__neigh}" != "${1}" ]; then - ip -6 neigh add proxy "${__neigh}" dev "${2}" - fi - done +# into_ns() - Entry point and demo script to run inside new namespace +into_ns() { + echo "We're in the new namespace now." + next + + echo "Networking is not configured yet:" + echo + cmd ip link show + echo + cmd ip address show + next + + echo "Let's run pasta(1) to configure networking and connect this" + echo "namespace. Note that we'll run pasta(1) from outside this" + echo "namespace, because it needs to implement the connection between" + echo "this namespace and the initial (\"outer\") one." + next + + echo "$$" > "${DEMO_DIR}/shell.pid" + rmdir "${DEMO_DIR}/pasta.wait" + next + + echo "Back to the new namespace, networking is configured:" + echo + cmd ip link show + echo + cmd ip address show + next + + echo "and we can now start passt(1), to connect this namespace to a" + echo "virtual machine. If you want to start a shell in this namespace," + echo "press 's' now. Exiting the shell will resume the script." + next + [ "${KEY}" = "s" ] && ${SHELL} + + cmd passt -P "${DEMO_DIR}/passt.pid" + echo + echo "...passt is running." + next + + __arch="$(uname -m)" + case ${__arch} in + x86_64) + __arch_supported=1 + __qemu_arch="qemu-system-x86_64 -M pc,accel=kvm:tcg" + ;; + *) + __arch_supported=0 + ;; + esac + + if [ "${__arch_supported}" -eq 1 ]; then + echo "We're ready to start a virtual machine now. This script" + echo "can download and use mbuto (https://mbuto.sh/) to build a" + echo "basic initramfs image. Otherwise, press 's' to skip this" + echo "step, and start an existing virtual machine yourself." + echo "You'll need to use the qrap(1) wrapper, with qemu options" + echo "as reported above." + + next + else + echo "This script doesn't know, yet, how to run a virtual" + echo "machine on your architecture (${__arch}). Please start an" + echo "existing virtual machine yourself, using the qrap(1)" + echo "wrapper, with qemu options as reported above." + echo + fi + + if [ "${__arch_supported}" -eq 0 ] || [ "${KEY}" = "s" ]; then + echo "Start a virtual machine now. Pressing any key here will" + echo "terminate passt and pasta, and clean up." + next + + exit 0 + fi + + cmd git -C "${DEMO_DIR}" clone git://mbuto.sh/mbuto + echo + cmd "${DEMO_DIR}/mbuto/mbuto" \ + -p "$(realpath "${0}")" -f "${DEMO_DIR}/demo.img" + echo + echo "The guest image is ready. The next step will start the guest." + echo "Use ^C to terminate it." + next + + cmd qrap 5 qemu-system-x86_64 -M pc,accel=kvm:tcg \ + -smp "$(nproc)" -m 1024 \ + -nographic -serial stdio -nodefaults -no-reboot -vga none \ + -initrd "${DEMO_DIR}/demo.img" \ + -kernel "/boot/vmlinuz-$(uname -r)" -append "console=ttyS0" \ + -net socket,fd=5 -net nic,model=virtio || : } -ns_idx=0 -for i in `seq 1 63`; do - ns="passt_${i}" - ns_idx=${i} - - busy=0 - for p in $(pidof passt); do - [ "$(ip netns identify ${p})" = "${ns}" ] && busy=1 && break - done - [ ${busy} -eq 0 ] && break -done - -[ ${busy} -ne 0 ] && echo "Couldn't create namespace" && exit 1 - -ip netns del "${ns}" 2>/dev/null || : -ip netns add "${ns}" -ip link del "veth_${ns}" 2>/dev/null || : -ip link add "veth_${ns}" up netns "${ns}" type veth peer name "veth_${ns}" -ip link set dev "veth_${ns}" up -ip link set dev "veth_${ns}" mtu 65535 -ip -n "${ns}" link set dev "veth_${ns}" mtu 65535 -ip -n "${ns}" link set dev lo up - -ipv4_main="192.0.2.$(((ns_idx - 1) * 4 + 1))" -ipv4_ns="192.0.2.$(((ns_idx - 1) * 4 + 2))" - -ip -n "${ns}" addr add "${ipv4_ns}/30" dev "veth_${ns}" -ip addr add "${ipv4_main}/30" dev "veth_${ns}" -ip -n "${ns}" route add default via "${ipv4_main}" - -sysctl -w net.ipv4.ip_forward=1 -nft delete table "${ns}_nat" 2>/dev/null || : -nft add table "${ns}_nat" -nft add chain "${ns}_nat" postrouting '{ type nat hook postrouting priority -100 ; }' -nft add rule "${ns}_nat" postrouting ip saddr "${ipv4_ns}" masquerade - -ipv6_addr="$(ipv6_devaddr "$(ipv6_dev)")" -if [ -n "${ipv6_addr}" ]; then - ipv6_passt="$(ipv6_mangle "${ipv6_addr}" ${ns_idx})" - ndp_setup "${ipv6_passt}" "veth_${ns}" - ip -n "${ns}" addr add "${ipv6_passt}/$(ipv6_mask "${ipv6_addr}")" dev "veth_${ns}" - ip addr add "${ipv6_addr}" dev "veth_${ns}" - ip route add "${ipv6_passt}" dev "veth_${ns}" - passt_ll="$(ipv6_ll_addr "veth_${ns}")" - main_ll="$(get_token "link/ether" $(ip -o link show "veth_${ns}"))" - ip neigh add "${passt_ll%%/*}" dev "veth_${ns}" lladdr "${main_ll}" - ip -n "${ns}" route add default via "${passt_ll%%/*}" dev "veth_${ns}" - - sysctl -w net.ipv6.conf.all.forwarding=1 -else - ipv6_passt= -fi - -ethtool -K "veth_${ns}" tx off -ip netns exec "${ns}" ethtool -K "veth_${ns}" tx off -ip netns exec "${ns}" sysctl -w net.ipv4.ping_group_range="0 2147483647" - - -sysctl -w net.core.rmem_max=16777216 -sysctl -w net.core.wmem_max=16777216 -sysctl -w net.core.rmem_default=16777216 -sysctl -w net.core.wmem_default=16777216 -sysctl -w net.ipv4.tcp_rmem="16777216 131072 16777216" -sysctl -w net.ipv4.tcp_wmem="16777216 131072 16777216" - -echo -echo "Namespace ${ns} set up, addresses:" -echo " ${ipv4_ns}" -echo " ${ipv6_passt}" -echo -echo "Starting passt..." -echo - -ip netns exec "${ns}" ./passt -f -e -t all -u all +STTY_BACKUP="$(stty -g)" +stty -icanon + +trap cleanup EXIT INT +[ "${1}" = "into_ns" ] && into_ns && exit 0 + +DEMO_DIR="$(mktemp -d)" +mkdir "${DEMO_DIR}/pasta.wait" + +echo "This script sets up a network and user namespace using pasta(1), then" +echo "starts a virtual machine in it, connected via passt(1), pausing at every" +echo "step. Press any key to go to the next step." +next + +echo "Let's create the network and user namespace, first. This could be done" +echo "with pasta(1) itself (just issue \`pasta\`), but for the sake of this" +echo "script we'll create it first with unshare(1), and run the next steps" +echo "of this script from there." +next + +start_pasta_delayed & +DEMO_DIR="${DEMO_DIR}" cmd unshare -rUn "${0}" into_ns + +exit 0 |