6 proc debug {level str} {
8 if {$level < $debug_level} { puts stderr "debug\[$level] $str" }
11 proc manyset {list args} {
12 foreach val $list var $args {
19 proc start_gen {use_gen_counter} {
20 global gen_counter rand_counter getlog_log rand_buf
21 random-bytes-init $use_gen_counter
25 proc packet-len {p} { expr {[string length $p]/2} }
27 proc packet-csum-ip {packet} {
30 while {[regexp {^([0-9a-f][0-9a-f])(.*)$} $packet dummy this packet]} {
33 return [expr {$cs & 0xffff}]
37 namespace eval Random-Bytes {
38 namespace export random-bytes random-bytes-init
40 proc random-bytes-init {seed} {
43 catch { set h $fh; unset fh; close $h }
45 set fh [open |[list openssl bf-ofb < /dev/zero -e -k " $seed"] r]
46 fconfigure $fh -translation binary
48 proc random-bytes {n} {
51 if {[string length $x] != $n} {
52 set h $fh; unset fh; close $h
53 error "openssl bf-ofb exited unexpectedly"
56 if {[string length $y] != $n*2} { error "binary format failed $n $y" }
61 namespace import Random-Bytes::*
63 proc choice-int {min max} {
64 set rv 0x[random-bytes 3]
66 int( double($rv) / double(0xffffff) * double($max+1-$min) )
71 proc choice-prob {cv def} {
72 set prob [config $cv $def]
73 set rv 0x[random-bytes 3]
74 return [expr {$rv < double($prob)*0x1000000}]
79 upvar #0 getlog_log log
84 proc config {cv def} {
86 if {[info exists v]} { return $v }
91 proc define {enum val name argnames body} {
92 upvar #0 enum/val2name/$enum v2n
93 upvar #0 enum/name2val/$enum n2v
96 proc enum/val/$enum/$val $argnames $body
99 proc depending-on {scope enum_and_var mtu mtuadjust args} {
100 upvar 1 $enum_and_var val
101 set mtu [expr {$mtu + $mtuadjust}]
102 set procname enum/val/$scope-$enum_and_var/[format %d $val]
103 if {[choice-prob $enum_and_var-unstruct 0.1] ||
104 [catch { info body $procname }]} {
105 # half the time random
108 get data randupto $mtu
111 uplevel 1 [list $procname] $mtu $args
116 proc get-for {scope} {
121 proc get {variable kind args} {
122 upvar 1 get/scope scope
123 upvar 1 $variable var
124 set var [eval [list get/$kind $scope $variable] $args]
127 proc get-config/number {val min max} { return $val }
128 proc get-config/v4addr {val} {
129 if {![regexp {^(\d+)\.(\d+)\.(\d+)\.(\d+)$} $val dummy a b c d]} {
130 error "bad v4addr ?$val?"
132 return [format 0x%02x%02x%02x%02x $a $b $c $d]
135 proc get-config {variable def kind args} {
136 # args currently ignored
137 upvar 1 get/scope scope
138 upvar 1 $variable var
139 set val [config $scope-$variable $def]
140 set var [eval [list get-config/$kind $val] $args]
143 proc get/enum {s v min max} {
144 if {[choice-prob $s-$v-unknown 0.5]} {
145 set rv [choice-int $min $max]
147 upvar #0 enum/val2name/$s-$v v2n
148 set rv [choice-int 1 [array size v2n]]
149 set rv [lindex [array names v2n] [expr {$rv-1}]]
151 if {[info exists v2n($rv)]} {
152 getlog "$v=$v2n($rv)\[$rv]"
159 proc get/number {s v min max} {
160 set rv [choice-int $min $max]
165 proc get/flag {s v defprob} {
166 set rv [choice-prob $s-$v $defprob]
167 if {$rv} { getlog "$v" } else { getlog "!$v" }
171 proc get/choice {s v defprob} {
172 set rv [choice-prob $s-$v $defprob]
173 if {$rv} { getlog "($v)" } else { getlog "(!$v)" }
177 proc get/randupto {s v maxlen} {
179 get l number 0 $maxlen
180 return [random-bytes $l]
183 proc get/ip-timestamp {s v} {
184 set rv [expr {[clock seconds] | 0x80000000}]
185 getlog "$v=[format %x $rv]"
189 proc get/v4addr {s v} {
193 for {set i 0} {$i<4} {incr i} {
194 set b [random-bytes 1]
196 append p $d [format %d 0x$b]
204 proc assemble {outvarname format} {
205 # format should look like those RFC diagrams.
206 # +-+-+ stuff and good formatting is mandatory.
207 # Tabs are forbidden.
209 # Field names are converted to lowercase; internal spaces
210 # are replaced with _. They are then assumed to be
211 # variable names in the caller's scope. The packet is
212 # assembled from those values (which must all be set)
213 # and stored in $varname in the caller's scope.
215 # Variables ?_whatever will be *set* with the location of the
216 # field in the string (in internal format); the corresponding
217 # `whatever' (with the ?_ stripped) will be read when assembling.
219 # Field name `0' means set the field to zero.
221 upvar 1 $outvarname out
224 debug 7 "ASSEMBLY $outvarname\n$format"
225 foreach l [split $format "\n"] {
227 if {[regexp -nocase {^ *\| +\| *$} $l]} {
228 if {![info exists wordbits]} {
229 error "vspace not in data @$lno\n?$l?"
232 } elseif {[regexp -nocase {^ *[|? a-z0-9]+$} $l]} {
233 if {[info exists words]} {
234 error "data without delimline @$lno\n?$l?"
238 } elseif {[regexp {^ *[-+]+ *$} $l]} {
241 while {[regexp {^([-= ]+)\+(.*)$} $l dummy before after]} {
242 set atpos([string length $before]) $wordbits
244 set l "$before=$after"
245 append newlineform "@[string length $before]:$wordbits "
248 append newlineform $wordbits
249 if {[info exists lineform]} {
250 if {"$newlineform" != "$lineform"} {
251 error "format change @$lno\n?$l?\n$wordformat != $oldwordformat"
253 if {![info exists words] || $words<0} {
254 error "consecutive delimlines @$lno\n?$l?"
256 append out [string repeat 00 [expr {$words*$wordbits/8}]]
258 while {[regexp -nocase \
259 {^([ =]*)\|( *[? a-z0-9]*[a-z0-9] *)\|(.*)$} \
260 $l dummy before midpart after]} {
261 debug 7 "RWORKG ?$l?"
262 set varname [string tolower [string trim $midpart]]
263 set varname [string map {{ } _} $varname]
264 set p1 [string length $before]
266 [string length $before] +
267 [string length $midpart] + 1
269 if {![info exists atpos($p1)] ||
270 ![info exists atpos($p2)]} {
271 error "vdelims not found @$lno $varname $p1 $p2 -- $lineform ?$cue?"
274 [string length $out]*4
279 $atpos($p2) - $atpos($p1) + ($words-1)*$wordbits
281 set location [list $bit1 $bitlen $outvarname-$varname]
282 if {[regexp {^\?_(.*)} $varname dummy realvarname]} {
283 debug 7 "LOCATING $varname $location"
284 upvar 1 $varname locvarname
285 set locvarname $location
286 set varname $realvarname
288 if {"$varname" == "0"} {
291 set value [uplevel 1 [list set $varname]]
293 assembly-overwrite out $location $value
295 append l [string repeat = [string length $midpart]]
298 debug 7 "REMAIN ?$l?"
300 if {$wordbits % 8 || $wordbits >32} {
301 error "bad wordbits $wordbits @$lno ?$l? $newlineform"
303 set lineform $newlineform
305 catch { unset words }
306 } elseif {[regexp {^ *$} $l]} {
308 error "huh? @$lno ?$l?"
311 debug 7 "ASSEMBLY\n$out\n"
315 proc assembly-overwrite {outvarname location value} {
316 upvar 1 $outvarname out
317 manyset $location bit1 bitlen diag
318 debug 8 "ASSEMBLY $diag == $value == 0x[format %x $value] (@$bit1+$bitlen)"
319 if {$bitlen < 32 && $value >= (1<<$bitlen)} {
320 error "$diag $value >= 2**$bitlen"
322 if {!($bit1 % 8) && !($bitlen % 8)} {
323 set char0no [expr {$bit1/4}]
324 set charlen [expr {$bitlen/4}]
325 set chareno [expr {$char0no + $charlen -1}]
326 set repl [format %0${charlen}x $value]
327 set out [string replace $out $char0no $chareno $repl]
329 while {$bitlen > 0} {
330 set byteno [expr {$bit1 / 8}]
331 set char0no [expr {$byteno*2}]
332 set char1no [expr {$char0no+1}]
333 set bytebit [expr {128>>($bit1 % 8)}]
334 set byte 0x[string range $out $char0no $char1no]
335 debug 7 "< $bit1+$bitlen $byteno $char0no $bytebit $byte $out"
337 ($value & (1<<($bitlen-1)))
339 : ($byte & ~$bytebit)
341 set out [string replace $out $char0no $char1no [format %02x $byte]]
342 debug 8 "> $bit1+$bitlen $byteno $char0no $bytebit 0x[format %02x $byte] $out"
350 proc gen_1_ip {mtu} {
352 upvar #0 ip_proto proto
353 upvar #0 ip_source source
354 upvar #0 ip_dest dest
357 get tos number 0x00 0xff
358 get id number 0x0000 0xffff
365 get frag number 0 0x1fff
367 get-config ttl 255 number 0 255
369 get-config source 127.0.0.1 v4addr
370 get-config dest 127.0.0.1 v4addr
371 # we don't do any IP options
373 set body [depending-on ip proto $mtu [expr {-4*$ihl}]]
374 set total_length [expr {$ihl + [packet-len $body]}]
375 set header_checksum 0
376 set flags [expr {$df*2 + $mf}]
378 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
379 |Version| IHL |TOS | Total Length |
380 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
382 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
383 | TTL | Proto | ? Header Checksum |
384 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
386 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
388 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
390 assembly-overwrite ip ${?_header_checksum} [packet-csum-ip $ip]
395 define ip-proto 1 icmp {mtu} {
399 manyset [depending-on icmp type $mtu -4] body code
400 if {![string length $code]} { get code number 0 255 }
403 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
404 | Type | Code | ? Checksum |
405 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
408 assembly-overwrite icmp ${?_checksum} [packet-csum-ip $icmp]
412 proc define-icmp-type-vanilla {num name} {
413 define icmp-type $num $name {mbl} "icmp-vanilla \$mbl [list $name]"
415 proc icmp-vanilla {mbl typename} {
416 get-for icmp-$typename
418 get body randupto $mbl
419 return [list $body $code]
422 define-icmp-type-vanilla 3 unreach
423 define icmp-unreach-code 0 net {} {}
424 define icmp-unreach-code 1 host {} {}
425 define icmp-unreach-code 2 proto {} {}
426 define icmp-unreach-code 3 port {} {}
427 define icmp-unreach-code 4 fragneeded {} {}
428 define icmp-unreach-code 5 sourceroutefail {} {}
430 define-icmp-type-vanilla 11 timeout
431 define icmp-timeout-code 0 intransit {} {}
432 define icmp-timeout-code 1 fragment {} {}
434 define-icmp-type-vanilla 12 parameters
435 define icmp-parameters-code 0 seepointer {} {}
437 define-icmp-type-vanilla 4 sourcequench
438 define icmp-sourcequench-code 0 quench {} {}
440 define icmp-type 5 redirect {mbl} {
441 get-for icmp-redirect
445 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
447 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
449 get data randupto [expr {$mbl-4}]
451 return [list $body $code]
454 define icmp-redirect-code 0 net {} {}
455 define icmp-redirect-code 1 host {} {}
456 define icmp-redirect-code 2 net+tos {} {}
457 define icmp-redirect-code 3 host+tos {} {}
459 define icmp-type 8 ping {mbl} { icmp-echo $mbl }
460 define icmp-type 0 pong {mbl} { icmp-echo $mbl }
461 proc icmp-echo {mbl} {
464 get id number 0 0xffff
465 get seq number 0 0xffff
467 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
469 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
471 get data randupto [expr {$mbl-8}]
473 return [list $body $code]
475 define icmp-echo-code 0 echo {} {}
477 define icmp-type 13 timestamp {mbl} { icmp-timestamp }
478 define icmp-type 14 timestampreply {mbl} { icmp-timestamp }
479 proc icmp-timestamp {} {
480 get-for icmp-timestamp
482 get id number 0 0xffff
483 get seq number 0 0xffff
484 get originate ip-timestamp
485 get receive ip-timestamp
486 get transmit ip-timestamp
488 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
490 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
492 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
494 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
496 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
498 return [list $body $code]
500 define icmp-timestamp-code 0 timestamp {} {}
502 define icmp-type 15 inforequest {mbl} { icmp-inforeq }
503 define icmp-type 16 inforeply {mbl} { icmp-inforeq }
504 proc icmp-inforeq {} {
507 get id number 0 0xffff
508 get seq number 0 0xffff
510 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
512 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
514 return [list $body $code]
516 define icmp-inforeq-code 0 timestamp {} {}
518 # MAYADD ICMP traceroute RFC1393
519 # MAYADD ICMP router discovery RFC1256
521 define ip-proto 17 udp {mtu} {
524 get source_port number 0 0xffff
525 get data randupto [expr {$mtu-8}]
526 set length [packet-len $data]
529 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
530 | Source Port | Dest Port |
531 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
532 | Length | ? Checksum |
533 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
536 get checksum choice 0.75
538 set csum [packet-csum-ip $udp]
539 if {!$csum} { set csum 0xffff }
543 assembly-overwrite udp ${?_checksum} $csum
551 global getlog_log errorInfo
554 set packet [gen_1_ip 576]
555 puts stdout "[format %06d $count] $getlog_log\n $packet"
557 puts stderr "\nERROR\n$count\n\n$emsg\n\n$errorInfo\n\n"
558 puts stdout "[format %06d $count] error"
562 if {![llength $argv]} {
563 for {set count 1} {$count < 100} {incr count} { emit $count }
564 } elseif {"$argv" == "--infinite"} {
566 while 1 { emit $count; incr count }
568 foreach count $argv { emit $count }