gemini - kennedy.gemi.dev

💾 Archived View for gopher.zcrayfish.soy › 0 › irc › w3.sh captured on 2023-11-04 at 11:50:56.
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#! /bin/ksh
#Set your hostname after this variable
fqdn=gopher.zcrayfish.soy

cr=$(printf '\r')
crlf=$(printf '\r\n')
null=$(printf '')

error400 () {
    printf "%s\15\12" "HTTP/1.0 400 Bad Request" \
        "Content-Type: text/plain; charset=us-ascii" \
        "Allow: GET" \
        "Date: $date" \
        "Server: gopher to http gateway at $fqdn" \
        "Connection: close" \
        "" \
        "HTTP/1.0 400 Bad Request" \
        "Request could not be understood - bad syntax" \
        "" \
        "gopher to http gateway at $fqdn"
    exit
}

error404 () {
    printf "%s\15\12" "HTTP/1.0 404 Not Found" \
        "Content-Type: text/plain; charset=us-ascii" \
        "Date: $date" \
        "Server: gopher to http gateway at $fqdn" \
        "Connection: close" \
        "" \
        "HTTP/1.0 404 Not Found" \
        "'$obj' doesn't exist!" \
        "This resource cannot be located." \
        "" \
        "gopher to http gateway at $fqdn"
}

error501 () {
    printf "%s\15\12" "HTTP/1.0 501 Not Implemented" \
        "Content-Type: text/plain; charset=us-ascii" \
        "Allow: GET" \
        "Date: $date" \
        "Server: gopher to http gateway at $fqdn" \
        "Connection: close" \
        "" \
        "HTTP/1.0 501 Not Implemented" \
        "This error has accoured for one of the following reasons:" \
        " *This server only implements the GET method (e.g. your browser sent a HEAD or PUT)" \
        " *This server, while acting as a gateway or proxy, does not support CSO queries." \
        "" \
        "gopher to http gateway at $fqdn"
    exit
}

# Gather request
read -t 30 -r cmd obj proto badclient
#Did we time out... If so just exit, HTTP 1.0 does not have a timeout code
test "$?" != "0" && exit
# See if request is a GET, if not, throw it away
test "$cmd" != 'GET' && error501 && exit
# Likewise ignore invalid gets too.
test ! -z "$badclient" && error400 && exit
# If it all looks good, find out what they want
filename="$(printf "%s" "$obj" | sed -e 's/%2c/,/' -e 's/%20/ /')"

# Gather headers, assume headers are done when we see CRLF or weird crap
while /bin/true; do
  read -t 300 -r header headervalue
  test "$header" = "$cr" && break
  test "$header" = "$crlf" && break
  test "$header" = "$null" && break
  header="$(printf "$header" | sed -e 's/://')"
  eval $header=$headervalue
  #[ "$header" == 


\r ] && break;
done


#log me up?

echo $cmd $obj $proto $badclient >> /tmp/www3.log
echo $header $headervalue >> /tmp/www3.log

#Get the HTTP command, filename, protocol version . . .
while read -r cmd obj proto badclient
do
    # We put the date in the loop in case the client waits before sending another request
    date="$(date -u +'%a, %d %b %Y %H:%M:%S GMT')"
    case "$cmd" in
	GET)

	    # See if request is a GET, if not, throw it away
	    test "$cmd" != 'GET' && error501 && exit
	    # Likewise ignore invalid gets too.
	    test ! -z "$badclient" && error400 && exit
	    # If it all looks good, find out what they want
	    filename="$(printf "%s" "$obj" | sed -e 's/%2c/,/' -e 's/%20/ /')"


	    #Step4
	    case "$filename" in
		/favicon.ico)
		    error404
		    ;;
		/sitemap*|/robots.txt)
		    printf "%s\15\12" "HTTP/1.0 200 OK" \
			"Date: $date" \
			"Server: gopher to http gateway at $fqdn" \
			"Connection: close" \
			""
		    lynx -anonymous -source "gopher://$fqdn:70/0/$filename"
		    ;;
		/2*)
		    error501
		    ;;
		/7*httpsearch*)
		    printf "%s\15\12" "HTTP/1.0 200 OK" \
			"Content-Type: text/html; level=1" \
			"Date: $date" \
			"Server: gopher to http gateway at $fqdn" \
			"Connection: close" \
			"" \
			'<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0 Strict Level 1//EN">'
		    searchytwothousand="$(printf "%s" "$filename" | sed 's/httpsearch=//g')"
		    lynx -anonymous -dump -source "gopher://$fqdn:70$searchytwothousand" | sed 's/<A HREF="\/\/$fqdn:70/<A HREF="http:\/\/$fqdn:80/g' | sed 's/<A HREF="\/\//<A HREF="gopher:\/\//g'
		    exit
		    ;;
		/7*)
		    printf "%s\15\12" "HTTP/1.0 200 OK" \
			"Content-Type: text/html; charset=us-ascii" \
			"Date: $date" \
			"Server: gopher to http gateway at $fqdn" \
			"Connection: close" \
			"" \
			'<!DOCTYPE html PUBLIC "-//IETF//DTD HTML 2.0//EN">' \
			'<title></title>' \
			"<form action='$fqdn$filename' method='get'>" \
			'<p>This is a searchable gopher index. Enter search keywords:<input type="text" name="httpsearch"></p></form>'
		    ;;
		/debug*)
		    printf "%s\15\12" "HTTP/1.0 200 OK" \
			"Content-Type: text/plain" \
			""
		    set
		    ;;
		###START OF DUMB / NON-INTELLIGENT GOPHER TYPES###
		/[04569IMPdghps]*)
		    printf "%s\15\12" "HTTP/1.0 200 OK"
		    case "$filename" in
			/0*)
			    printf "%s\15\12" "Content-Type: text/plain"
			    ;;
			/4*)
			    printf "%s\15\12" "Content-Type: application/mac-binhex40"
			    ;;
			/5*)
			    printf "%s\15\12" "Content-Type: application/octet-stream"
			    ;;
			/6*)
			    printf "%s\15\12" "Content-Type: message/rfc822"
			    ;;
			/9*)
			    printf "%s\15\12" "Content-Type: application/octet-stream"
			    ;;
			/I*)
			    printf "%s\15\12" "Content-Type: image/jpeg"
			    ;;
			/M*)
			    printf "%s\15\12" "Content-Type: message/rfc822"
			    ;;
			/P*)
			    printf "%s\15\12" "Content-Type: application/pdf"
			    ;;
			/d*)
			    printf "%s\15\12" "Content-Type: application/pdf"
			    ;;
			/g*)
			    printf "%s\15\12" "Content-Type: image/gif"
			    ;;
			/h*)
			    printf "%s\15\12" "Content-Type: text/html"
			    ;;
			/p*)
			    printf "%s\15\12" "Content-Type: image/png"
			    ;;
			/s*)
			    printf "%s\15\12" "Content-Type: application/octet-stream"
			    ;;
		    esac
		    printf "%s\15\12" "Date: $date" \
			"Server: gopher to http gateway at $fqdn" \
			"Connection: close" \
			""
		    lynx -anonymous -dump -source "gopher://$fqdn:70$filename"
		    ;;
		###END OF DUMB / NON-INTELLIGENT GOPHER TYPES###
		*)
		    printf "%s\15\12" 'HTTP/1.0 200 OK' \
			'Content-Type: text/html; level=1' \
			"Date: $date" \
			"Server: gopher to http gateway at $fqdn" \
			'Connection: close' \
			'' \
			'<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0 Strict Level 1//EN">'
		    lynx -anonymous -dump -source "gopher://$fqdn:70$filename" | \
			tidy -in -w 0 -cn --doctype omit --show-errors 0 --show-warnings 0 --tidy-mark 0 --quiet 1 --uppercase-tags 1 --uppercase-attributes 1| \
			sed -e 's/<A HREF="\/\/'$fqdn':70/<A HREF="http:\/\/'$fqdn'/g' -e 's/<A HREF="\/\//<A HREF="gopher:\/\//g'

		    ;;
	    esac
	    ;;
	HEAD|POST|PUT|DELETE|TRACE|CONNECT|PATCH)
	    error501
	    ;;
	"$cr" | "$crlf" | "$null" )
	    exit;
	    ;;
    esac
done
exit