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 $fqdn"
exit
}
#Get the HTTP command, filename, protocol version . . .
while read -r cmd obj proto badclient
do
# We put the date in the loop in case the client waits before sending another request
date="$(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
# 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/ /')"