#! /bin/bash FQDN=zcrayfish.dyndns.org #Get the HTTP command, filename, protocol version . . . read -r CMD OBJ PROTO BADCLIENT filename="$(echo -ne "$OBJ" | sed -e 's/%2c/,/I' -e 's/%20/ /I')" # get HTTP extra headers while read -r KEY VALUE FOO do test -z "$KEY" && break; [ "$KEY" == $'\r' ] && break; done date="$(date -u +'%a, %d %b %Y %R:%S GMT')" error400 () { echo -e "HTTP/1.0 400 Bad Request\r" echo -e "Content-Type: text/plain charset=us-ascii\r" echo -e "Allow: GET\r" echo -e "Date: $date\r" echo -e "Server: gopher to http gateway at $FQDN" echo -e "Connection: close" echo -e "\r\n" echo -e "HTTP/1.0 400 Bad Request\r" echo -e "Request could not be understood - bad syntax\r" echo -e "\r" echo -e "gopher to http gateway at $FQDN" exit } error404 () { echo -e "HTTP/1.0 404 Not Found\r" echo -e "Content-Type: text/plain charset=us-ascii\r" echo -e "Date: $date\r" echo -e "Server: gopher to http gateway at $FQDN" echo -e "Connection: close" echo -e "\r\n" echo -e "HTTP/1.0 404 Not Found\r" echo -e "'$OBJ' doesn't exist!\r" echo -e "This resource cannot be located.\r" echo -e "\r" echo -e "gopher to http gateway at $FQDN" } error501 () { echo -e "HTTP/1.0 501 Not Implemented\r" echo -e "Content-Type: text/plain charset=us-ascii\r" echo -e "Allow: GET\r" echo -e "Date: $date\r" echo -e "Server: gopher to http gateway at $FQDN" echo -e "Connection: close" echo -e "\r\n" echo -e "HTTP/1.0 501 Not Implemented\r" echo -e "This error has accoured for one of the following reasons:\r" echo -e " *This server only implements the GET method (e.g. your browser sent a HEAD or PUT)\r" echo -e " *This server, while acting as a gateway or proxy, does not support CSO queries.\r" echo -e "\r" echo -e "gopher to http gateway at $FQDN" exit } # See if request is a GET, if not, throw it away test "$CMD" != 'GET' && error501 # Likewise ignore invalid gets too. test ! -z "$BADCLIENT" && error400 && exit #Step4 case "$filename" in /favicon.ico) error404 ;; /sitemap*|/robots.txt) echo -e "HTTP/1.0 200 OK\r" echo -e "Date: $date\r" echo -e "Server: gopher to http gateway at $FQDN\r" echo -e "Connection: close\r" echo -e "\r" /usr/bin/lynx -anonymous -dump -source gopher://$FQDN:70/0/$filename ;; /2*) error501 ;; /7*httpsearch*) echo -e "HTTP/1.0 200 OK\r" echo -e "Content-Type: text/html; level=1\r" echo -e "Date: $date\r" echo -e "Server: gopher to http gateway at $FQDN" echo -e "Connection: close\r" echo -e "\r" echo -e '' searchytwothousand="$(echo $filename | sed 's/httpsearch=//g')" /usr/bin/lynx -anonymous -dump -source gopher://$FQDN:70$searchytwothousand | sed 's/' echo -e '' echo -e "' ;; /debug*) echo -e "HTTP/1.0 200 OK\r" echo -e "Content-Type: text/plain\r" echo -e "\r" set ;; ###START OF DUMB / NON-INTELLIGENT GOPHER TYPES### /0*|/4*|/5*|/6*|/9*|/g*|/s*|/h*|/I*|/p*|/d*) echo -e "HTTP/1.0 200 OK\r" case "$filename" in /0*) echo -e "Content-Type: text/plain\r" ;; /4*) echo -e "Content-Type: application/mac-binhex40\r" ;; /5*) echo -e "Content-Type: application/octet-stream\r" ;; /6*) echo -e "Content-Type: text/plain\r" ;; /9*) echo -e "Content-Type: application/octet-stream\r" ;; /g*) echo -e "Content-Type: image/gif\r" ;; /s*) echo -e "Content-Type: application/octet-stream\r" ;; /h*) echo -e "Content-Type: $CONTENT_TYPE\r" ;; /I*) echo -e "Content-Type: image/jpeg\r" ;; /p*) echo -e "Content-Type: image/png\r" ;; /d*) echo -e "Content-Type: application/pdf\r" ;; esac echo -e "Date: $date\r" echo -e "Server: gopher to http gateway at $FQDN\r" echo -e "Connection: close\r" echo -e "\r" /usr/bin/lynx -anonymous -dump -source gopher://$FQDN:70$filename ;; ###END OF DUMB / NON-INTELLIGENT GOPHER TYPES### *) echo -e "HTTP/1.0 200 OK\r" echo -e "Content-Type: text/html; level=1\r" echo -e "Date: $date\r" echo -e "Server: gopher to http gateway at $FQDN" echo -e "Connection: close\r" echo -e "\r" echo -e '' /usr/bin/lynx -anonymous -dump -source gopher://$FQDN:70$filename | \ tidy -in -w 0 -cn --doctype omit --show-errors 0 --show-warnings 0 --tidy-mark 0 --quiet 1 | \ sed -e 's/