#! /bin/ash #####Configuration section##### readonly PATH=/usr/lib/restricted/bin:/usr/bin #The fqdn variable defines the hostname of the gopher server you'll be proxying to gemini. readonly fqdn=gopher.zcrayfish.soy #The port variable defines the TCP port of the gopher server you'll be proxying to gemini. readonly port=70 #Use curl, or use the gopher daemon directly usecurl=true #full path to gopher daemon readonly gopherd=/usr/sbin/gophernicus #command options to pass to the gopher daemon readonly gopherd_options="-h $fqdn -nv -nf -np -f /srv/gopher/filters -o utf-8 -l /var/log/gopher.access.log -T 300" ####End of configuration section, use caution if editing below this line#### #pull in the entire request and toss it into the gopherrequest variable IFS= read -t 30 -r gopherrequest #function to handle clients that don't support gophertype w typew () { printf '\xEF\xBB\xBF' printf '%s\15\12' "Your gopher client does not support gophertype w." \ "the URL that your gopher client should have sent you to is:" \ "$1" } #function to handle clients that don't support the hURL hack. hURL () { printf '\xEF\xBB\xBF' printf '%s\15\12' '' \ '' \ '' \ '' \ ' ' \ " " \ " " \ " Redirect to: $1" \ '' \ '' \ '

You are following a link from gopher to another URL or protocol.' \ 'You should be automatically taken to the site shortly.' \ "If you don't get sent there, please use the URL below to get there:

" \ "

$1

" \ '' } #This is where the magic happens, see if the request matches a client that doesn't know what to do with type w #or with hURL. case "$gopherrequest" in http://*|https://*|ftp://*|irc://*|ircs://*|mailto:*) #w3m converts the query string initiator into tab... typew "$gopherrequest" | sed -e 's/ /?/g' ;; whttp://*|whttps://*|wftp://*|wirc://*|wircs://*|wmailto:*) #the cuts here are because some clients prepend the gophertype to the request. #Fun fact: some older servers expected this behavior! typew "$(echo "$gopherrequest" | cut -b 2- | sed -e 's/ /?/g')" ;; w/http://*|w/https://*|w/ftp://*|w/irc://*|w/ircs://*|w/mailto:*) typew "$(echo "$gopherrequest" | cut -b 3- | sed -e 's/ /?/g')" ;; URL:http://*|URL:https://*|URL:ftp://*|URL:irc://*|URL:ircs://*|URL:mailto:*) #for hURLs, don't encode : and completely drop CR and LF. #dropping CRLF in one go breaks w3m. hURL "$(echo "$gopherrequest" | cut -b 5- | urlencode | sed -e 's/%3A/:/g' -e 's/%0D//g' -e 's/%0A//g')" ;; /URL:http://*|/URL:https://*|/URL:ftp://*|/URL:irc://*|/URL:ircs://*|/URL:mailto:*) hURL "$(echo "$gopherrequest" | cut -b 6- | urlencode | sed -e 's/%3A/:/g' -e 's/%0D//g' -e 's/%0A//g')" ;; h/URL:http://*|h/URL:https://*|h/URL:ftp://*|h/URL:irc://*|h/URL:ircs://*|h/URL:mailto:*) hURL "$(echo "$gopherrequest" | cut -b 7- | urlencode | sed -e 's/%3A/:/g' -e 's/%0D//g' -e 's/%0A//g')" ;; *) export REMOTE_HOST export REMOTE_PORT export REMOTE_ADDR="$REMOTE_HOST" if [ "$usecurl" = "true" ] ; then #We use /0 in the URL to make it valid for curl; ditto for the tab removal and the carriage return removal. #Many versions of curl fail with ZERO output if the URL contains a carriage return. gopherrequestsanitized="$(echo "$gopherrequest" | sed -e 's/ /?/g' -e 's/\r$//g')" gopherurl="gopher://$fqdn:$port/0$gopherrequestsanitized" curl -q --disable -s --output - "$gopherurl" else echo "$gopherrequest" | ${gopherd} ${gopherd_options} fi ;; esac exit