@ -105,6 +105,12 @@ namespace eval punk::basictelnet {
set window_cols 80
set window_rows 25
#Some modern(?) telnet servers seem to just pump out utf-8 encoded graphics by default - without negotiating or confirming binary etc? review
variable encoding_guess utf-8
#we will experimentally assume utf-8 - which should handle ascii fine - and flip to cp437 when data encountered that cannot be valid utf-8
#todo - proper charset negotiation
variable debug
set debug 0
proc debug {{on_off ""}} {
@ -137,7 +143,7 @@ namespace eval punk::basictelnet {
#try: DUMB,ANSI,VT100,XTERM
#see also the Mud Terminal Type Standard as an extensiont to RFC1091 Telenet Terminal-Type
variable remote_terminal_type
set remote_terminal_type "" ;#emt py until/unless reported via an option 24 send from the remote
set remote_terminal_type "" ;#empt y until/unless reported via an option 24 send from the remote
#*** !doctools
@ -146,13 +152,13 @@ namespace eval punk::basictelnet {
#[list_begin definitions]
variable optioncodes
dict set optioncodes 0 [list name "Binary Transmission"]
dict set optioncodes 1 [list name "Echo"]
dict set optioncodes 2 [list name "Reconnection"]
dict set optioncodes 3 [list name "Suppress Go Ahead"]
dict set optioncodes 4 [list name "Approx Message Size Negotiation"]
dict set optioncodes 5 [list name "Status"] ;#RFC 859
dict set optioncodes 6 [list name "Timing Mark"]
dict set optioncodes 0 [list name "Binary Transmission" short "bin" ]
dict set optioncodes 1 [list name "Echo" short "echo" ]
dict set optioncodes 2 [list name "Reconnection" short "recon" ]
dict set optioncodes 3 [list name "Suppress Go Ahead" short "Suppress GA" ]
dict set optioncodes 4 [list name "Approx Message Size Negotiation" short "msgsize nego" ]
dict set optioncodes 5 [list name "Status" short "status" ] ;#RFC 859
dict set optioncodes 6 [list name "Timing Mark" short "tmark" ]
dict set optioncodes 7 [list name "Remote Controlled Trans and Echo"]
dict set optioncodes 8 [list name "Output Line Width"]
dict set optioncodes 9 [list name "Output Page Size"]
@ -170,29 +176,29 @@ namespace eval punk::basictelnet {
dict set optioncodes 21 [list name "SUPDUP"]
dict set optioncodes 22 [list name "SUPDUP Output"]
dict set optioncodes 23 [list name "Send Location"]
dict set optioncodes 24 [list name "Terminal Type"]
dict set optioncodes 24 [list name "Terminal Type" short "ttype" ]
dict set optioncodes 25 [list name "End of Record"]
dict set optioncodes 26 [list name "TACACS User Identification"]
dict set optioncodes 26 [list name "TACACS User Identification" short "tacacs" ]
dict set optioncodes 27 [list name "Output Marking"]
dict set optioncodes 28 [list name "Terminal Location Number"]
dict set optioncodes 29 [list name "Telnet 3270 Regime"]
dict set optioncodes 30 [list name "X.3 PAD"]
dict set optioncodes 31 [list name "Negotiate About Window Size"] ;#RFC 1073 NAWS
dict set optioncodes 32 [list name "Terminal Speed"] ;#rfc 1079
dict set optioncodes 31 [list name "Negotiate About Window Size" short "NAWS" ] ;#RFC 1073 NAWS
dict set optioncodes 32 [list name "Terminal Speed" short "tspeed" ] ;#rfc 1079
dict set optioncodes 33 [list name "Remote Flow Control"]
dict set optioncodes 34 [list name "Line Mode"]
dict set optioncodes 35 [list name "X Display Location"]
dict set optioncodes 36 [list name "Environment Option"]
dict set optioncodes 37 [list name "Authentication Option"]
dict set optioncodes 38 [list name "Encryption Option"]
dict set optioncodes 39 [list name "New Environment Option"]
dict set optioncodes 36 [list name "Environment Option" short "env opt" ]
dict set optioncodes 37 [list name "Authentication Option" short "authent opt" ]
dict set optioncodes 38 [list name "Encryption Option" short "encrypt opt" ]
dict set optioncodes 39 [list name "New Environment Option" short "new env opt" ]
dict set optioncodes 40 [list name "TN3270E"]
dict set optioncodes 41 [list name "XAUTH"]
dict set optioncodes 42 [list name "CHARSET"]
dict set optioncodes 43 [list name "Telnet Remote Serial Port (RSP)"]
dict set optioncodes 43 [list name "Telnet Remote Serial Port (RSP)" short "RSP" ]
dict set optioncodes 44 [list name "Com Port Control Option"]
dict set optioncodes 45 [list name "Telnet Supress Local Echo"]
dict set optioncodes 46 [list name "Telnet Start TLS"]
dict set optioncodes 45 [list name "Telnet Supress Local Echo" short "no-local-echo" ]
dict set optioncodes 46 [list name "Telnet Start TLS" short "starttls" ]
dict set optioncodes 47 [list name "KERMIT"]
dict set optioncodes 48 [list name "SEND-URL"]
dict set optioncodes 49 [list name "FORWARD_X"]
@ -216,6 +222,8 @@ namespace eval punk::basictelnet {
variable optioncodes
variable server_option_state
variable client_option_state
variable encoding_guess
set encoding_guess utf-8
dict for {k _v} $optioncodes {
dict set server_option_state $k 0 ;#DO from our perspective
@ -223,6 +231,36 @@ namespace eval punk::basictelnet {
}
}
reset_option_states ;#initialise to NVT - all off
proc get_server_option_state_summary {} {
variable server_option_state
variable optioncodes
set summary ""
dict for {k v} $server_option_state {
if {$v} {
if {[dict exists $optioncodes $k short]} {
append summary "[dict get $optioncodes $k short],"
} else {
append summary "[dict get $optioncodes $k name],"
}
}
}
set summary [string trimright $summary ,]
}
proc get_client_option_state_summary {} {
variable client_option_state
variable optioncodes
set summary ""
dict for {k v} $client_option_state {
if {$v} {
if {[dict exists $optioncodes $k short]} {
append summary "[dict get $optioncodes $k short],"
} else {
append summary "[dict get $optioncodes $k name],"
}
}
}
set summary [string trimright $summary ,]
}
# -----------------------------------
# A rudimentary hardcoded configuration for options/negotiation
@ -319,6 +357,8 @@ namespace eval punk::basictelnet {
#experiment
proc debug_frame {info inputchannel outputchannel} {
variable encoding_guess
variable terminal_type
variable writing_debug_frame
if {$writing_debug_frame == 1} {
after 1 {punk::basictelnet::add_debug "" $readchannel $writechannel}
@ -332,13 +372,17 @@ namespace eval punk::basictelnet {
incr writing_debug_frame
set server_summary "SVR:[get_server_option_state_summary]"
set client_summary "CLI:[get_client_option_state_summary]"
set info $server_summary\n$client_summary\n$info
#set existing_handler [fileevent stdin readable]
set RST "\x1b\[m"
set w 80
set infoframe [textblock::frame -width $w -ansiborder [a+ green bold] -title "[a cyan]Telnet Debug$RST" $info]
set infoframe [textblock::frame -width $w -ansiborder [a+ green bold] -title "[a cyan]Telnet Debug $terminal_type (encoding guess:$encoding_guess) $RST" $info]
#set w [textblock::width $infoframe]
set spacepatch [textblock::block $w 4 "$RST "]
set spacepatch "$RST[textblock::block $w 4 { }]"
#puts -nonewline [punk::ansi::cursor_off]
#use non cursorsave version - slower - but less likely to interfere with cursor operations in data
@ -353,9 +397,10 @@ namespace eval punk::basictelnet {
if {[catch {
#punk::console::move_emitblock_return 6 90 $spacepatch\n$infoframe
punk::console::move_emitblock_return 6 90 $spacepatch
flush stdout
punk::console::move_emitblock_return 10 90 $infoframe
#puts -nonewline stdout [punk::ansi::cursor_on] ;#Enabling cursor should take account of whether it was enabled before - we don't have that info currently! review
flush stdout
#puts -nonewline stdout [punk::ansi::cursor_on] ;#Enabling cursor should take account of whether it was enabled before - we don't have that info currently! review
} errM]} {
puts stderr "debug_frame error: $errM"
}
@ -405,6 +450,7 @@ namespace eval punk::basictelnet {
#waiting data will be supplied to this handler if the other handler over-read (e.g repl handling ANSI ESC \[6n response on stdin finding other data before the ANSI response.)
proc toServer {sock} {
variable server_option_state
variable encoding_guess
upvar ::punk::console::input_chunks_waiting input_chunks_waiting
set nextwaiting ""
@ -456,8 +502,6 @@ namespace eval punk::basictelnet {
set wrote_sock 0
}
#JJJ
#update idletasks
if {$wrote_sock && ![eof $sock]} {
##################################################################################
#Re-enable channel read handler only if no waiting chunks - must process in order
@ -486,6 +530,8 @@ namespace eval punk::basictelnet {
}
proc fromServer {sock} {
variable encoding_guess
variable debug
variable fromserver_unprocessed
fileevent $sock readable {}
variable in_sb
@ -532,16 +578,30 @@ namespace eval punk::basictelnet {
#mini debug buffer for each fromServer call - render using add_debug each loop
set debug_info ""
append debug_info "------raw data [string length $data]---prev unprocessed:[string length $last_unprocessed]---" \n
#append debug_info [ansistring VIEW -lf 1 -vt 1 [encoding convertfrom utf-8 $data]] \n
set
append debug_info "------------------------------------------" \n
if {$debug} {
#only do this text-processing work if debug is on
append debug_info "------raw data [string length $data]---prev unprocessed:[string length $last_unprocessed]---" \n
#append debug_info [ansistring VIEW -lf 1 -vt 1 [encoding convertfrom utf-8 $data]] \n
set rawview [ansistring VIEW -lf 1 -vt 1 [encoding convertfrom $encoding_guess $data]]
set viewblock [overtype::left -wrap 1 -width 78 -height 4 "" $rawview]
set lines [split $viewblock \n]
if {[llength $lines] > 4} {
append debug_info [join [list {*}[lrange $lines 0 1] "...<[expr {[llength $lines] -4}] lines undisplayed>..." {*}[lrange $lines end-1 end]] \n]
} else {
append debug_info $viewblock
}
append debug_info "\n------------------------------------------" \n
}
if {[string length $data]} {
#puts "1----------------------------------"
#puts [ansistring VIEW -lf 1 -vt 1 $data]
#---------------
#TODO - fix possible chunk boundary that gives us an incomplete IAC sequence.
#As it stands - we won't properly handle it - possible it will cause intermittent telnet protocol bugs!
#will need a mechanism within protocol function and loop to abort and throw back to next fromServer event
#---------------
while 1 {
if {!$in_sb} {
#\xff 255 is the IAC Data Byte (Interpret As Command)
@ -555,22 +615,24 @@ namespace eval punk::basictelnet {
break
}
#write [string range $data 0 $idx-1]
puts -nonewline stdout [encoding convertfrom utf-8 [string range $data 0 $idx-1]]
puts -nonewline stdout [encoding convertfrom $encoding_guess [string range $data 0 $idx-1]]
flush stdout
set post_IAC_byte [string index $data [expr {$idx+1}]]
incr idx 2
if {$post_IAC_byte < "\xef"} {
#??
#write \xf0$post_IAC_byte ;#from wiki code. purpose not understood.
puts stderr "unexpected - byte less than EF following IAC"
set data [string range $data $idx-1 end]
set data [string range $data $idx+1 end]
incr idx
} elseif {$post_IAC_byte == "\xff"} {
#write \xf0 ;#?? This came from wiki code - intention unclear.. latin small letter Eth
#RFC indicates double up of \xff is treated as literal
#this can't be part of utf-8 - so
#this can't be part of utf-8 -
puts -nonewline stdout \xff
set data [string range $data $idx end]
set data [string range $data $idx+2 end]
incr idx 2
} else {
incr idx 2
set ophex ""
#telnet commands are at least 2 bytes
binary scan $post_IAC_byte H2 cmdhex
@ -578,7 +640,7 @@ namespace eval punk::basictelnet {
fb - fc - fd - fe {
#WILL, WON'T, DO, DON'T
#3bytes - last is option
set opbyte [string index $data [expr { $idx}] ]
set opbyte [string index $data $idx]
#don't incr idx - protocol will do so
#incr idx
binary scan $opbyte H2 ophex
@ -630,15 +692,27 @@ namespace eval punk::basictelnet {
}
} ;#end inner while
#puts -nonewline stdout $data
set prefix [punk::lib::get_utf8_leading $data]
set plen [string length $prefix]
set tail [string range $data $plen end]
if {$encoding_guess eq "utf-8"} {
set prefix [punk::lib::get_utf8_leading $data]
set plen [string length $prefix]
set tail [string range $data $plen end]
if {[string length $tail] && [string index $tail 0] ne "\xFF" && ![punk::lib::is_utf8_multibyteprefix $tail]} {
puts stderr ">>>>[ansistring VIEW -lf 1 -vt 1 $tail]<<<<"
#Our utf-8 guess has been disproven!
set encoding_guess cp437
set prefix $data
set tail ""
}
} else {
set prefix $data
set tail ""
}
set ansisplits [list]
if {[string length $tail]} {
set fromserver_unprocessed $tail
puts -nonewline stdout "[encoding convertfrom utf-8 $prefix]"
puts -nonewline stdout [encoding convertfrom $encoding_guess $prefix]
} else {
set fromserver_unprocessed ""
#look for incomplete ansi sequences
@ -647,10 +721,10 @@ namespace eval punk::basictelnet {
set last_pt [lindex $ansisplits end] ;#last part is supposed to be plaintext - if it looks like it contains a partial ansi - throw it to fromserver_unprocessed for next fromServer call
if {[string first "\x1b" $last_pt] >= 0} {
set complete [join [lrange $ansisplits 0 end-1] ""]
puts -nonewline stdout "[encoding convertfrom utf-8 $complete]"
puts -nonewline stdout [encoding convertfrom $encoding_guess $complete]
set fromserver_unprocessed $last_pt
} else {
puts -nonewline stdout "[encoding convertfrom utf-8 $prefix]"
puts -nonewline stdout [encoding convertfrom $encoding_guess $prefix]
}
}
@ -662,7 +736,6 @@ namespace eval punk::basictelnet {
set debug_info ""
#add_debug has potentially written to another part of the screen with different SGR colour/background etc
#ie - by interrupting the telnet data with our own output, we lose SGR context when returning to normal output.
variable debug
if {$debug} {
if {![llength $ansisplits]} {
set ansisplits [punk::ansi::ta::split_codes_single $prefix]
