mirror of
https://passt.top/passt
synced 2024-12-22 13:45:32 +00:00
slirp4netns.sh: Introduce compatibility wrapper behaving like slirp4netns(1)
Warning: draft quality, not really tested, --enable-sandbox not
supported yet.
Example:
$ unshare -rUn
# echo $$
3130879
$ ./slirp4netns.sh -m 65520 -c 3130879 tap0
sent tapfd=5 for tap0
received tapfd=5
Starting slirp
* MTU: 65520
* Network: 10.0.2.0
* Netmask: 255.255.255.0
* Gateway: 10.0.2.2
* DNS: 10.0.2.3
* Recommended IP: 10.0.2.100
WARNING: 127.0.0.1:* on the host is accessible as 10.0.2.2 (set --disable-host-loopback to prohibit connecting to 127.0.0.1:*)
# ip li sh
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
33: tap0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65520 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
link/ether 5e:9d:a0:c5:cf:67 brd ff:ff:ff:ff:ff:ff
# ip ad sh
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
33: tap0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65520 qdisc pfifo_fast state UNKNOWN group default qlen 1000
link/ether 5e:9d:a0:c5:cf:67 brd ff:ff:ff:ff:ff:ff
inet 10.0.2.0/24 scope global tap0
valid_lft forever preferred_lft forever
inet6 fe80::5c9d:a0ff:fec5:cf67/64 scope link
valid_lft forever preferred_lft forever
# ip ro sh
default via 10.0.2.2 dev tap0
10.0.2.0/24 dev tap0 proto kernel scope link src 10.0.2.0
root@epycfail:~# ip -6 ro sh
fe80::/64 dev tap0 proto kernel metric 256 pref medium
# iperf3 -c 10.0.2.2 -l1M
Connecting to host 10.0.2.2, port 5201
[ 5] local 10.0.2.0 port 43014 connected to 10.0.2.2 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 1.38 GBytes 11.8 Gbits/sec 0 9.96 MBytes
[ 5] 1.00-2.00 sec 1.59 GBytes 13.6 Gbits/sec 0 13.3 MBytes
[ 5] 2.00-3.00 sec 1.63 GBytes 14.0 Gbits/sec 0 13.3 MBytes
[ 5] 3.00-4.00 sec 1.78 GBytes 15.3 Gbits/sec 0 13.3 MBytes
[ 5] 4.00-5.00 sec 1.80 GBytes 15.5 Gbits/sec 0 15.8 MBytes
[ 5] 5.00-6.00 sec 1.69 GBytes 14.5 Gbits/sec 0 15.8 MBytes
[ 5] 6.00-7.00 sec 1.65 GBytes 14.2 Gbits/sec 0 15.8 MBytes
[ 5] 7.00-8.00 sec 1.68 GBytes 14.4 Gbits/sec 0 15.8 MBytes
[ 5] 8.00-9.00 sec 1.60 GBytes 13.7 Gbits/sec 0 15.8 MBytes
[ 5] 9.00-10.00 sec 1.66 GBytes 14.3 Gbits/sec 0 15.8 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 16.5 GBytes 14.1 Gbits/sec 0 sender
[ 5] 0.00-10.01 sec 16.4 GBytes 14.1 Gbits/sec receiver
iperf Done.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio
parent
3c6d24dd30
commit
2e6e29a757
227
slirp4netns.sh
Executable file
227
slirp4netns.sh
Executable file
@ -0,0 +1,227 @@
|
||||
#!/bin/sh -euf
|
||||
#
|
||||
# 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
|
||||
#
|
||||
# slirp4netns.sh - Compatibility wrapper for pasta, behaving like slirp4netns(1)
|
||||
#
|
||||
# WARNING: Draft quality, not really tested, --enable-sandbox not supported yet
|
||||
#
|
||||
# Copyright (c) 2021 Red Hat GmbH
|
||||
# Author: Stefano Brivio <sbrivio@redhat.com>
|
||||
|
||||
PASTA_PID="$(mktemp)"
|
||||
PASTA_OPTS="-q --ipv4-only -a 10.0.2.0 -n 24 -g 10.0.2.2 -m 1500 --no-ndp --no-dhcpv6 --no-dhcp -P ${PASTA_PID}"
|
||||
|
||||
# add() - Add single option to $PASTA_OPTS
|
||||
# $1: Option name, with or without argument
|
||||
add() {
|
||||
PASTA_OPTS="${PASTA_OPTS} ${1}"
|
||||
}
|
||||
|
||||
# drop() - Drop one option (without argument) from $PASTA_OPTS
|
||||
# $1: Option name
|
||||
drop() {
|
||||
old_opts="${PASTA_OPTS}"; PASTA_OPTS=
|
||||
for o in ${old_opts}; do [ "${o}" != "${1}" ] && add "${o}"; done
|
||||
}
|
||||
|
||||
# sub() - Substitute option in $PASTA_OPTS, with or without argument
|
||||
# $1: Option name
|
||||
# $2: Option argument, can be empty
|
||||
sub() {
|
||||
old_opts="${PASTA_OPTS}"; PASTA_OPTS=
|
||||
next=0
|
||||
for o in ${old_opts}; do
|
||||
if [ ${next} -eq 1 ]; then
|
||||
next=0; add "${1} ${2}"; shift; shift; continue
|
||||
fi
|
||||
|
||||
for r in ${@}; do [ "${o}" = "${r}" ] && next=1 && break; done
|
||||
[ "${next}" -eq 0 ] && add "${o}"
|
||||
done
|
||||
}
|
||||
|
||||
# xorshift() - pseudorandom permutation of 16-bit group
|
||||
# $1: 16-bit value to shuffle
|
||||
xorshift() {
|
||||
# Adaptation of Xorshift algorithm from:
|
||||
# Marsaglia, G. (2003). Xorshift RNGs.
|
||||
# Journal of Statistical Software, 8(14), 1 - 6.
|
||||
# doi:http://dx.doi.org/10.18637/jss.v008.i14
|
||||
# with triplet (5, 3, 1), suitable for 16-bit ranges.
|
||||
n=${1}
|
||||
: $((n ^= n << 5))
|
||||
: $((n ^= n >> 3))
|
||||
: $((n ^= n << 1))
|
||||
echo ${n}
|
||||
}
|
||||
|
||||
# opt() - Validate single option from getopts
|
||||
# $1: Option type
|
||||
# $@: Variable names to assign to
|
||||
opt() {
|
||||
case "${1}" in
|
||||
u32)
|
||||
if ! printf "%i" "${OPTARG}" >/dev/null 2>&1 || \
|
||||
[ "${OPTARG}" -lt 0 ]; then
|
||||
echo "${OPT} must be a non-negative integer"
|
||||
usage
|
||||
fi
|
||||
eval ${2}="${OPTARG}"
|
||||
;;
|
||||
mtu)
|
||||
if ! printf "%i" "${OPTARG}" >/dev/null 2>&1 || \
|
||||
[ "${OPTARG}" -lt 0 ] || [ "${OPTARG}" -ge 65522 ]; then
|
||||
echo "MTU must be a positive integer (< 65522)"
|
||||
usage
|
||||
fi
|
||||
eval ${2}="${OPTARG}"
|
||||
;;
|
||||
str)
|
||||
eval ${2}="${OPTARG}"
|
||||
;;
|
||||
net4)
|
||||
addr="${OPTARG%/*}"
|
||||
mask="${OPTARG##*/}"
|
||||
|
||||
{ [ -z "${mask}" ] || !printf "%i" "${mask}" >/dev/null 2>&1 \
|
||||
|| [ ${mask} -gt 32 ] || ${mask} -le 0 ]; } && usage
|
||||
|
||||
expr "${addr}" : \
|
||||
'[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$' \
|
||||
>/dev/null
|
||||
[ $? -ne 0 ] && usage
|
||||
|
||||
ifs="${IFS}"; IFS='.'
|
||||
for q in ${addr}; do [ ${q} -gt 255 ] && usage; done
|
||||
IFS="${ifs}"
|
||||
|
||||
eval ${2}="${addr}"
|
||||
eval ${3}="${mask}"
|
||||
;;
|
||||
esac
|
||||
}
|
||||
|
||||
# usage() - Print slirpnetns(1) usage and exit indicating failure
|
||||
# $1: Invalid option name, if any
|
||||
usage() {
|
||||
[ ${#} -eq 1 ] && printf "s: invalid option -- '%s'\n" "${0}" "${1}"
|
||||
cat << EOF
|
||||
Usage: ${0} [OPTION]... PID|PATH TAPNAME
|
||||
User-mode networking for unprivileged network namespaces.
|
||||
|
||||
-c, --configure bring up the interface
|
||||
-e, --exit-fd=FD specify the FD for terminating slirp4netns
|
||||
-r, --ready-fd=FD specify the FD to write to when the network is configured
|
||||
-m, --mtu=MTU specify MTU (default=1500, max=65521)
|
||||
-6, --enable-ipv6 enable IPv6 (experimental)
|
||||
-a, --api-socket=PATH specify API socket path
|
||||
--cidr=CIDR specify network address CIDR (default=10.0.2.0/24)
|
||||
--disable-host-loopback prohibit connecting to 127.0.0.1:* on the host namespace
|
||||
--netns-type=TYPE specify network namespace type ([path|pid], default=pid)
|
||||
--userns-path=PATH specify user namespace path
|
||||
--enable-sandbox create a new mount namespace (and drop all caps except CAP_NET_BIND_SERVICE if running as the root)
|
||||
--enable-seccomp enable seccomp to limit syscalls (experimental)
|
||||
-h, --help show this help and exit
|
||||
-v, --version show version and exit
|
||||
EOF
|
||||
exit 1
|
||||
}
|
||||
|
||||
# version() - Print version
|
||||
version() {
|
||||
echo "slirp4netns-like wrapper for pasta"
|
||||
exit 0
|
||||
}
|
||||
|
||||
# gen_addr6() - Generate pseudorandom IPv6 address, changes every second
|
||||
gen_addr6() {
|
||||
printf "fd00"
|
||||
n=$(($(xorshift $(date +%S)) % 65536))
|
||||
for i in $(seq 2 8); do
|
||||
printf ":%04x" ${n}
|
||||
n=$(($(xorshift ${n}) % 65536))
|
||||
done
|
||||
}
|
||||
|
||||
# Default options
|
||||
v6=0
|
||||
get_pid=0
|
||||
MTU=1500
|
||||
A4="10.0.2.0"
|
||||
M4="255.255.255.0"
|
||||
no_map_gw=0
|
||||
EFD=0
|
||||
RFD=0
|
||||
|
||||
while getopts ce:r:m:6a:hv-: OPT 2>/dev/null; do
|
||||
if [ "${OPT}" = "-" ]; then
|
||||
OPT="${OPTARG%%[= ]*}"
|
||||
OPTARG="${OPTARG#${OPT}[= ]}"
|
||||
fi
|
||||
case "${OPT}" in
|
||||
c | configure) add "--config-net" ;;
|
||||
e | exit-fd) opt u32 EFD ;;
|
||||
r | ready-fd) opt u32 RFD ;;
|
||||
m | mtu) opt mtu MTU && sub -m ${MTU} ;;
|
||||
6 | enable-ipv6) V6=1 ;;
|
||||
a | api-socket) opt str API ;;
|
||||
cidr) opt net4 A4 M4 && sub -a ${A4} -n ${M4} ;;
|
||||
disable-host-loopback) add "--no-map-gw" && no_map_gw=1 ;;
|
||||
netns-type) : Autodetected ;;
|
||||
userns-path) opt_str USERNS_NAME "${OPTARG}" ;;
|
||||
enable-sandbox) : Not supported yet ;;
|
||||
enable-seccomp) : Cannot be disabled ;;
|
||||
h | help) usage "${0}" ;;
|
||||
v | version) version ;;
|
||||
??*) usage "${0}" "${OPT}" ;;
|
||||
?) usage "${0}" ;;
|
||||
esac
|
||||
done
|
||||
|
||||
shift $((OPTIND - 1))
|
||||
[ ${#} -ne 2 ] && usage
|
||||
ns_spec="${1}"
|
||||
|
||||
ifname="${2}"
|
||||
add "-I ${ifname}"
|
||||
|
||||
if [ ${v6} -eq 1 ]; then
|
||||
drop "--ipv4-only"
|
||||
add "-a $(gen_addr6) -g fd00::2 -D fd00::3"
|
||||
fi
|
||||
|
||||
./pasta ${PASTA_OPTS} ${ns_spec} 2>/dev/null && \
|
||||
[ ${RFD} -ne 0 ] && echo "1" >&${RFD}
|
||||
|
||||
trap "kill $(cat ${PASTA_PID}); rm ${PASTA_PID}" INT TERM
|
||||
|
||||
cat << EOF
|
||||
sent tapfd=5 for ${ifname}
|
||||
received tapfd=5
|
||||
Starting slirp
|
||||
* MTU: ${MTU}
|
||||
* Network: ${A4}
|
||||
* Netmask: ${M4}
|
||||
* Gateway: 10.0.2.2
|
||||
* DNS: 10.0.2.3
|
||||
* Recommended IP: 10.0.2.100
|
||||
EOF
|
||||
|
||||
if [ ${no_map_gw} -eq 0 ]; then
|
||||
echo "WARNING: 127.0.0.1:* on the host is accessible as 10.0.2.2 (set --disable-host-loopback to prohibit connecting to 127.0.0.1:*)"
|
||||
fi
|
||||
|
||||
if [ ${EFD} -ne 0 ]; then
|
||||
dd count=1 of=/dev/null 2>/dev/null <&${EFD}
|
||||
else
|
||||
while read a; do :; done
|
||||
fi
|
||||
|
||||
exit 0
|
||||
Loading…
Reference in New Issue
Block a user