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mwan3: add "use" function to mwan3 utils

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Use "mwan3 use" to wrap a command with interface bindings so that you can
avoid the mwan3 rules and test behavior on a specific interface.

eg "mwan3 use wan ping -c1 1.1.1.1"

Additional binding arguments to the command will have their system
calls intercepted and ignored.

eg "mwan3 use wan ping -c1 -I tun0 1.1.1.1" will use the
device associated with "wan", rather than "tun0".

Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>
This commit is contained in:
Aaron Goodman 2020-08-25 18:16:07 -04:00
parent bbbc6127ab
commit d49ca29eca
3 changed files with 44 additions and 17 deletions
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8
net/mwan3/files/lib/mwan3/common.sh
View file

@ -49,10 +49,12 @@ mwan3_get_true_iface()
mwan3_get_src_ip()
{
local family _src_ip true_iface device addr_cmd default_ip IP sed_str
true_iface=$2
local family _src_ip interface true_iface device addr_cmd default_ip IP sed_str
interface=$2
mwan3_get_true_iface true_iface $interface
unset "$1"
config_get family "$true_iface" family ipv4
config_get family "$interface" family ipv4
if [ "$family" = "ipv4" ]; then
addr_cmd='network_get_ipaddr'
default_ip="0.0.0.0"

29
net/mwan3/files/usr/sbin/mwan3
View file

@ -22,7 +22,7 @@ Available commands:
connected Show directly connected networks
rules Show active rules
status Show all status
use <iface> <cmd> Run a command bound to <iface> and avoid mwan3 rules
EOF
}
@ -123,8 +123,33 @@ restart() {
/etc/init.d/mwan3 start
}
wrap() {
# Run a command with the device, src_ip and fwmark set to avoid processing by mwan3
# firewall rules
local interface device src_ip family
mwan3_init
config_load mwan3
interface=$1 ; shift
[ -z "$*" ] && echo "no command specified for mwan3 wrap" && return
network_get_device device $interface
[ -z "$device" ] && echo "could not find device for $interface" && return
mwan3_get_src_ip src_ip $interface
[ -z "$src_ip" ] && echo "could not find src_ip for $interface" && return
config_get family $interface family
[ -z "$family" ] && echo "could not find family for $interface. Using ipv4." && family='ipv4'
echo "Running '$*' with DEVICE=$device SRCIP=$src_ip FWMARK=$MMX_DEFAULT FAMILY=$family"
# shellcheck disable=SC2048
FAMILY=$family DEVICE=$device SRCIP=$src_ip FWMARK=$MMX_DEFAULT LD_PRELOAD=/lib/mwan3/libwrap_mwan3_sockopt.so.1.0 $*
}
case "$1" in
ifup|ifdown|interfaces|policies|connected|rules|status|start|stop|restart)
ifup|ifdown|interfaces|policies|connected|rules|status|start|stop|restart|use)
mwan3_init
# shellcheck disable=SC2048
$*

4
net/mwan3/files/usr/sbin/mwan3track
View file

@ -129,7 +129,7 @@ firstconnect() {
return
fi
mwan3_get_src_ip SRC_IP $true_iface
mwan3_get_src_ip SRC_IP $INTERFACE
LOG debug "firstconnect: called on $INTERFACE/$true_iface ($DEVICE). Status is $STATUS. SRC_IP is $SRC_IP"
@ -223,7 +223,7 @@ main() {
wait $TRACK_PID
result=$?
else
WRAP $PING -${family#ipv} -I ${SOURCE} -c $count -W $timeout -s $size -t $max_ttl -q $track_ip 2>/dev/null > $TRACK_OUTPUT &
WRAP $PING -${family#ipv} -c $count -W $timeout -s $size -t $max_ttl -q $track_ip 2>/dev/null > $TRACK_OUTPUT &
TRACK_PID=$!
wait $TRACK_PID
ping_status=$?