}
return [format 0x%02x%02x%02x%02x $a $b $c $d]
}
+proc get-config/linkaddr {val} {
+ return $val
+}
proc get-config {variable def kind args} {
# args currently ignored
proc emit {seed} {
global getlog_log errorInfo mtu fake_time_t
- global minframelen
+ global minframelen linktypename
get-for ip
get-config source 127.0.0.1 v4addr
append packet [string repeat 00 [expr {$minframelen - $l}]]
}
- # RFC894
- set llpkt [random-bytes 12]
- append llpkt 0800
- append llpkt $packet
+ set llpkt [link/$linktypename/linkencap $packet]
set len [packet-len "$llpkt"]
pcap_write {
}
+# link/ether - RFC894
+proc link/ether/linkparams {} { return {1 46} }
+proc link/ether/defaddr {} { return 00:00:00:00:00:00 }
+proc link/ether/procaddr {input sd} {
+ set v [string tolower $input]
+ if {[regexp {^([0-9a-f]{1,2}\:){6}$} $v:]} {
+ set o {}
+ foreach b [split $v :] { append o [format %02x 0x$b] }
+ set v $o
+ }
+ if {![regexp -nocase {^[0-9a-f]{12}$} $v]} {
+ error "invalid $sd ethernet addr $input ($v)"
+ }
+ return $v
+}
+proc link/ether/linkencap {packet} {
+ global link_source link_dest
+ set llpkt {}
+ append llpkt $link_dest $link_source 0800
+ append llpkt $packet
+ return $llpkt
+}
+
+
proc nextarg {} {
global argv
if {![llength $argv]} { error "need another arg" }
}
proc nextarg_num {} { return [expr {[nextarg] + 0}] }
+proc nextarg_il {} {
+ set a [nextarg]
+ if {![regexp -nocase {^([0-9.]+)/(.+)$} $a dummy i l]} {
+ error "--source/--dest needs <ip-addr>/<link-addr>"
+ }
+ return [list $i $l]
+}
set debug_level 0
-set mtu 576
+set mtu 100
set upto {}
set xseed {}
+set linktypename ether
while {[regexp {^\-\-} [lindex $argv 0]]} {
set o [nextarg]
switch -exact -- $o {
--write { pcap_open [nextarg] }
--mtu { set mtu [nextarg_num] }
--xseed { set xseed [nextarg] }
- --source { set config/ip-source [nextarg] }
- --dest { set config/ip-dest [nextarg] }
+ --linktype { set linktypename [nextarg] }
+ --source { manyset [nextarg_il] config/ip-source config/link-source }
+ --dest { manyset [nextarg_il] config/ip-dest config/link-dest }
default { error "bad option $o" }
}
}
+proc process_linkaddr {sd} {
+ global linktypename
+ upvar #0 link_$sd l
+ get-for link
+ get-config $sd [link/$linktypename/defaddr] linkaddr
+ set l [link/$linktypename/procaddr [set $sd] $sd]
+}
+
+manyset [link/$linktypename/linkparams] linktype minframelen
+process_linkaddr source
+process_linkaddr dest
+
set magic d4c3b2a1
set version_major 2
set version_minor 4
set sigfigs 0
set snaplen 131073
-# RFC894
-set linktype 1
-set minframelen 46
-
pcap_write {
x32 magic
u16 version_major