package require Tclx
load chiark_tcl_hbytes-1.so
+load chiark_tcl_dgram-1.so
set netlink(inside) {
local-address "172.18.232.9";
set extra(outside) {}
proc mkconf {which} {
+ global tmp
global netlink
global ports
global extra
global netlinkfh
- set pipefp test/$which.netlink
+ set pipefp $tmp/$which.netlink
foreach tr {t r} {
file delete $pipefp.$tr
exec mkfifo -m600 $pipefp.$tr
fconfigure $fh -blocking 0 -buffering none -translation binary
}
fileevent $netlinkfh($which.r) readable [list netlink-readable $which]
- set fakeuf test/$which.fake-userv
+ set fakeuf $tmp/$which.fake-userv
set fakeuh [open $fakeuf w 0755]
puts $fakeuh "#!/bin/sh
set -e
append cfg "$delim
udp {
port $port;
+ address \"::1\", \"127.0.0.1\";
buffer sysbuffer(4096);
}
"
proc spawn-secnet {which} {
global netlinkfh
+ global tmp
upvar #0 pids($which) pid
- set cf test/$which.conf
+ set cf $tmp/$which.conf
set ch [open $cf w]
puts $ch [mkconf $which]
close $ch
- set argl [list -dvnc $cf]
+ set argl [list strace -o$tmp/$which.strace ./secnet -dvnc $cf]
set pid [fork]
if {!$pid} {
- execl ./secnet $argl
+ execl [lindex $argl 0] [lrange $argl 1 end]
}
puts -nonewline $netlinkfh($which.t) [hbytes h2raw c0]
}
[hbytes h2raw c0[join $p ""]c0]
}
+file mkdir test/tmp
+set tmp test/tmp
+set socktmp $tmp
+regsub {^(?!/)} $socktmp {./} socktmp ;# dgram-socket wants ./ or /
+
+proc udp-proxy {} {
+ global socktmp udpsock
+ set u $socktmp/udp
+ file delete $u
+ regsub {^(?!/)} $u {./} u
+ set udpsock [dgram-socket create $u]
+ dgram-socket on-receive $udpsock udp-relay
+}
+
+proc udp-relay {data src sock args} {
+ global udpsock socktmp
+ set headerlen [expr {52+1}]
+ set orgsrc $src
+
+ set dst [hbytes range $data 0 $headerlen]
+ regsub {(?:00)*$} $dst {} dst
+ set dst [hbytes h2raw $dst]
+
+ hbytes overwrite data 0 [hbytes zeroes $headerlen]
+ regsub {.*/} $src {} src
+ set srch [hbytes raw2h $src]
+ hbytes append srch 00
+ if {[catch {
+ if {[regexp {[^.,:0-9a-f]} $dst c]} { error "bad dst" }
+ if {[hbytes length $srch] > $headerlen} { error "src addr too long" }
+ hbytes overwrite data 0 $srch
+ dgram-socket transmit $udpsock $data $socktmp/$dst
+ } emsg]} {
+ puts stderr "$orgsrc -> $dst: $emsg"
+ }
+}
+
+udp-proxy
spawn-secnet inside
spawn-secnet outside
after 500 sendpkt
after 1000 sendpkt
+after 5000 timed-out
vwait ok