Annotation of gforth/httpd.fs, revision 1.26

1.1       pazsan      1: #! /usr/local/bin/gforth
                      2: 
1.26    ! anton       3: \ Copyright (C) 2000,2002,2003,2004,2006,2007,2008 Free Software Foundation, Inc.
1.6       anton       4: 
                      5: \ This file is part of Gforth.
                      6: 
                      7: \ Gforth is free software; you can redistribute it and/or
                      8: \ modify it under the terms of the GNU General Public License
1.23      anton       9: \ as published by the Free Software Foundation, either version 3
1.6       anton      10: \ of the License, or (at your option) any later version.
                     11: 
                     12: \ This program is distributed in the hope that it will be useful,
                     13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15: \ GNU General Public License for more details.
                     16: 
                     17: \ You should have received a copy of the GNU General Public License
1.23      anton      18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.6       anton      19: 
1.21      pazsan     20: \ This relies on inetd or xinetd:
                     21: 
                     22: \ To run the server on port 4444, do the following:
                     23: 
                     24: \ Add the following line to /etc/services:
                     25: \ gforth          4444/tcp
                     26: 
                     27: \ If you use inetd, add the following line to /etc/inetd.conf:
                     28: \ gforth stream tcp nowait.10000   wwwrun   /usr/users/bernd/bin/httpd
                     29: 
                     30: \ If you use xinetd, create the folliwing service in /etc/xinetd.d:
                     31: \ service gforth
                     32: \ {
                     33: \         socket_type     = stream
                     34: \         protocol        = tcp
                     35: \         wait            = no
                     36: \         user            = wwwrun
                     37: \         server          = /home/bernd/bin/httpd
                     38: \ }
                     39: 
                     40: \ If you want port 80, replace the service "gforth" with "http"
                     41: 
1.1       pazsan     42: warnings off
                     43: 
1.8       pazsan     44: require string.fs
1.1       pazsan     45: 
1.21      pazsan     46: Variable DocumentRoot  s" /srv/www/htdocs/" DocumentRoot $!
                     47: Variable UserDir       s" public_html/"     UserDir      $!
1.11      pazsan     48: 
1.1       pazsan     49: Variable url
1.4       pazsan     50: Variable posted
                     51: Variable url-args
1.1       pazsan     52: Variable protocol
1.2       pazsan     53: Variable data
1.4       pazsan     54: Variable active
1.2       pazsan     55: Variable command?
1.1       pazsan     56: 
                     57: : get ( addr -- )  name rot $! ;
                     58: : get-rest ( addr -- )  source >in @ /string dup >in +! rot $! ;
                     59: 
1.4       pazsan     60: wordlist constant values
                     61: wordlist constant commands
1.1       pazsan     62: 
1.2       pazsan     63: : value:  ( -- )  name
1.1       pazsan     64:   Forth definitions 2dup 1- nextname Variable
1.2       pazsan     65:   values set-current nextname here cell - Create ,
1.1       pazsan     66:   DOES> @ get-rest ;
1.2       pazsan     67: : >values  values 1 set-order command? off ;
1.1       pazsan     68: 
1.2       pazsan     69: \ HTTP protocol commands                               26mar00py
1.1       pazsan     70: 
1.4       pazsan     71: : rework-% ( add -- ) { url }  base @ >r hex
1.2       pazsan     72:     0 url $@len 0 ?DO
                     73:        url $@ drop I + c@ dup '% = IF
                     74:            drop 0. url $@ I 1+ /string
                     75:            2 min dup >r >number r> swap - >r 2drop
                     76:        ELSE  0 >r  THEN  over url $@ drop + c!  1+
                     77:     r> 1+ +LOOP  url $!len
                     78:     r> base ! ;
                     79: 
1.5       pazsan     80: : rework-? ( addr -- )
                     81:     dup >r $@ '? $split url-args $! nip r> $!len ;
1.4       pazsan     82: 
1.5       pazsan     83: : get-url ( -- ) url get protocol get-rest
1.4       pazsan     84:     url rework-? url rework-% >values ;
                     85: 
1.2       pazsan     86: commands set-current
                     87: 
1.4       pazsan     88: : GET   get-url data on  active off ;
                     89: : POST  get-url data on  active on  ;
                     90: : HEAD  get-url data off active off ;
1.2       pazsan     91: 
                     92: \ HTTP protocol values                                 26mar00py
                     93: 
                     94: values set-current
                     95: 
                     96: value: User-Agent:
                     97: value: Pragma:
                     98: value: Host:
                     99: value: Accept:
                    100: value: Accept-Encoding:
                    101: value: Accept-Language:
                    102: value: Accept-Charset:
                    103: value: Via:
                    104: value: X-Forwarded-For:
                    105: value: Cache-Control:
                    106: value: Connection:
                    107: value: Referer:
1.4       pazsan    108: value: Content-Type:
                    109: value: Content-Length:
1.11      pazsan    110: value: Keep-Alive:
1.1       pazsan    111: 
                    112: definitions
                    113: 
                    114: Variable maxnum
                    115: 
                    116: : ?cr ( -- )
                    117:   #tib @ 1 >= IF  source 1- + c@ #cr = #tib +!  THEN ;
1.17      pazsan    118: : refill-loop ( -- flag ) base @ >r base off
1.11      pazsan    119:   BEGIN  refill ?cr  WHILE  ['] interpret catch drop  >in @ 0=  UNTIL
1.17      pazsan    120:   true  ELSE  maxnum off false  THEN  r> base ! ;
1.1       pazsan    121: : get-input ( -- flag ior )
1.3       pazsan    122:   s" /nosuchfile" url $!  s" HTTP/1.0" protocol $!
1.2       pazsan    123:   s" close" connection $!
1.3       pazsan    124:   infile-id push-file loadfile !  loadline off  blk off
1.2       pazsan    125:   commands 1 set-order  command? on  ['] refill-loop catch
1.11      pazsan    126:   Keep-Alive $@ snumber? dup 0> IF  nip  THEN  IF  maxnum !  THEN
1.4       pazsan    127:   active @ IF  s" " posted $! Content-Length $@ snumber? drop
                    128:       posted $!len  posted $@ infile-id read-file throw drop
                    129:   THEN  only forth also  pop-file ;
1.1       pazsan    130: 
                    131: \ Rework HTML directory                                26mar00py
                    132: 
                    133: Variable htmldir
                    134: 
                    135: : rework-htmldir ( addr u -- addr' u' / ior )
1.16      anton     136:   htmldir $! htmldir $@ compact-filename htmldir $!len drop
1.12      anton     137:   htmldir $@ s" ../" string-prefix?
1.11      pazsan    138:   IF    -1 EXIT  THEN  \ can't access below current directory
1.12      anton     139:   htmldir $@ s" ~" string-prefix?
1.11      pazsan    140:   IF    UserDir $@ htmldir dup $@ 2dup '/ scan '/ skip
1.1       pazsan    141:         nip - nip $ins
1.11      pazsan    142:   ELSE  DocumentRoot $@ htmldir 0 $ins  THEN
1.1       pazsan    143:   htmldir $@ 1- 0 max + c@ '/ = htmldir $@len 0= or
                    144:   IF  s" index.html" htmldir dup $@len $ins  THEN
                    145:   htmldir $@ file-status nip ?dup ?EXIT
                    146:   htmldir $@ ;
                    147: 
                    148: \ MIME type handling                                   26mar00py
                    149: 
                    150: : >mime ( addr u -- mime u' )  2dup tuck over + 1- ?DO
                    151:   I c@ '. = ?LEAVE  1-  -1 +LOOP  /string ;
                    152: 
                    153: : >file ( addr u -- size fd )
                    154:   r/o bin open-file throw >r
                    155:   r@ file-size throw drop
                    156:   ." Accept-Ranges: bytes" cr
                    157:   ." Content-Length: " dup 0 .r cr r> ;
1.4       pazsan    158: : transparent ( size fd -- ) { fd }
                    159:     $4000 allocate throw swap dup 0 ?DO
                    160:        2dup over swap $4000 min fd read-file throw type
                    161:        $4000 - $4000 +LOOP  drop
                    162:     free fd close-file throw throw ;
1.1       pazsan    163: 
1.5       pazsan    164: \ Keep-Alive handling                                  26mar00py
                    165: 
                    166: : .connection ( -- )
                    167:   ." Connection: "
1.12      anton     168:   connection $@ s" Keep-Alive" str= maxnum @ 0> and
1.5       pazsan    169:   IF  connection $@ type cr
                    170:       ." Keep-Alive: timeout=15, max=" maxnum @ 0 .r cr
                    171:       -1 maxnum +!  ELSE  ." close" cr maxnum off  THEN ;
                    172: 
1.2       pazsan    173: : transparent: ( addr u -- ) Create  here over 1+ allot place
                    174:   DOES>  >r  >file
1.1       pazsan    175:   .connection
                    176:   ." Content-Type: "  r> count type cr cr
1.2       pazsan    177:   data @ IF  transparent  ELSE  nip close-file throw  THEN ;
1.1       pazsan    178: 
                    179: \ mime types                                           26mar00py
                    180: 
1.2       pazsan    181: : mime-read ( addr u -- )  r/o open-file throw
                    182:     push-file loadfile !  0 loadline ! blk off
1.11      pazsan    183:     BEGIN  refill  WHILE
                    184:        char '# <> >in off name nip 0<> and  IF
                    185:            >in off name
                    186:            BEGIN  >in @ >r name nip  WHILE
                    187:                r> >in ! 2dup transparent:  REPEAT
                    188:            2drop rdrop
                    189:        THEN
1.2       pazsan    190:     REPEAT  loadfile @ close-file pop-file throw ;
                    191: 
1.1       pazsan    192: : lastrequest
                    193:   ." Connection: close" cr maxnum off
                    194:   ." Content-Type: text/html" cr cr ;
                    195: 
                    196: wordlist constant mime
                    197: mime set-current
                    198: 
1.2       pazsan    199: : shtml ( addr u -- )  lastrequest
1.25      pazsan    200:     data @ IF  also forth included previous  ELSE  2drop  THEN ;
1.1       pazsan    201: 
1.2       pazsan    202: s" application/pgp-signature" transparent: sig
                    203: s" application/x-bzip2" transparent: bz2
                    204: s" application/x-gzip" transparent: gz
1.21      pazsan    205: s" /etc/mime.types" ' mime-read catch [IF]  2drop
                    206:     \ no /etc/mime.types found on this machine,
                    207:     \ generating the most important types:
                    208:     s" text/html" transparent: html
                    209:     s" image/gif" transparent: gif
                    210:     s" image/png" transparent: png
                    211:     s" image/jpg" transparent: jpg
                    212: [THEN]
1.1       pazsan    213: 
                    214: definitions
                    215: 
1.2       pazsan    216: s" text/plain" transparent: txt
1.1       pazsan    217: 
                    218: \ http errors                                          26mar00py
                    219: 
1.21      pazsan    220: : .server ( -- )  ." Server: Gforth httpd/1.0 ("
1.2       pazsan    221:     s" os-class" environment? IF  type  THEN  ." )" cr ;
1.5       pazsan    222: : .ok  ( -- ) ." HTTP/1.1 200 OK" cr .server ;
1.1       pazsan    223: : html-error ( n addr u -- )
1.2       pazsan    224:     ." HTTP/1.1 " 2 pick . 2dup type cr .server
1.5       pazsan    225:     2 pick &405 = IF ." Allow: GET, HEAD, POST" cr  THEN
                    226:     lastrequest
                    227:     ." <HTML><HEAD><TITLE>" 2 pick . 2dup type
                    228:     ." </TITLE></HEAD>" cr
1.1       pazsan    229:     ." <BODY><H1>" type drop ." </H1>" cr ;
                    230: : .trailer ( -- )
1.21      pazsan    231:     ." <HR><ADDRESS>Gforth httpd 1.0</ADDRESS>" cr
1.1       pazsan    232:     ." </BODY></HTML>" cr ;
1.5       pazsan    233: : .nok ( -- ) command? @ IF  &405 s" Method Not Allowed"
1.2       pazsan    234:     ELSE  &400 s" Bad Request"  THEN  html-error
1.5       pazsan    235:     ." <P>Your browser sent a request that this server "
                    236:     ." could not understand.</P>" cr
                    237:     ." <P>Invalid request in: <CODE>"
                    238:     error-stack cell+ 2@ swap type
1.1       pazsan    239:     ." </CODE></P>" cr .trailer ;
1.5       pazsan    240: : .nofile ( -- ) &404 s" Not Found" html-error
1.1       pazsan    241:     ." <P>The requested URL <CODE>" url $@ type
                    242:     ." </CODE> was not found on this server</P>" cr .trailer ;
                    243: 
                    244: \ http server                                          26mar00py
                    245: 
1.9       pazsan    246: Defer redirect?  ( addr u -- addr' u' t / f )
                    247: Defer redirect ( addr u -- )
                    248: :noname 2drop false ; IS redirect?
                    249: 
1.5       pazsan    250: : http ( -- )  get-input  IF  .nok  ELSE
1.9       pazsan    251:     IF  url $@ 1 /string 2dup redirect? IF  redirect 2drop  ELSE
                    252:        rework-htmldir
1.1       pazsan    253:        dup 0< IF  drop .nofile
                    254:        ELSE  .ok  2dup >mime mime search-wordlist
1.2       pazsan    255:            0= IF  ['] txt  THEN  catch IF  maxnum off THEN
1.9       pazsan    256:        THEN  THEN  THEN  THEN  outfile-id flush-file throw ;
1.1       pazsan    257: 
1.11      pazsan    258: : httpd  ( n -- )  dup maxnum ! 0 <# #S #> Keep-Alive $!
1.15      pazsan    259:   maxnum @ 0 DO  ['] http catch  maxnum @ 0= or  ?LEAVE  LOOP ;
1.1       pazsan    260: 
1.4       pazsan    261: script? [IF]  :noname &100 httpd bye ; is bootmessage  [THEN]
1.5       pazsan    262: 
                    263: \ Use Forth as server-side script language             26mar00py
                    264: 
                    265: : $> ( -- )
                    266:     BEGIN  source >in @ /string s" <$" search  0= WHILE
                    267:         type cr refill  0= UNTIL  EXIT  THEN
                    268:     nip source >in @ /string rot - dup 2 + >in +! type ;
                    269: : <HTML> ( -- )  ." <HTML>" $> ;
1.9       pazsan    270: 
                    271: \ provide transparent proxying
                    272: 
1.10      pazsan    273: include ./proxy.fs

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