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|
#!/bin/sh
##
## === gosher ===
##
## gosher is a simple gopher server in a POSIX shell script:
##
## $ ./gosher [<PORT> [<GOPHERDIR>]
##
## If PORT is not specified, the default is 70. If GOPHERDIR is not
## specified, "./" is assumed
##
##
## (c) 2018 Vincenzo 'KatolaZ' Nicosia <katolaz@freaknet.org>
##
##
######################
##
## If the script is called with basename "gosher", launch the netcat
## server...
##
NETCAT=netcat
OPREFIX=/tmp/outf_
IPREFIX=/tmp/inf_
##DEBUG=
DEBUG=yes
## function
cleanup(){
[ -p "${OPREFIX}$$" ] && rm -f ${OPREFIX}$$
[ -p "${IPREFIX}$$" ] && rm -f ${IPREFIX}$$
exit 1
}
MYNAME=$(basename $0)
if [ -z "${MYNAME#gosher}" ]; then
## we are called as gosher -- launch the server
PORT=${1:-70}
GOPHERDIR=${2:-"./"}
trap cleanup 0 HUP INT TRAP TERM QUIT
OUTF=${OPREFIX}$$
INF=${IPREFIX}$$
mkfifo -m 600 $OUTF $INF
while [ 1 -eq 1 ]; do
./gosher_serve ${GOPHERDIR} <$INF >$OUTF &
${NETCAT} -vv -l -p ${PORT} >$INF <$OUTF
ret=$?
done
exit 0
fi
######################
##
## ...otherwise, serve a request
##
## function
invalid_selector(){
sel="$1"
echo "3Error: Invalid selector: \"$sel\""
echo "."
exit 1
}
## function
serve_selector(){
sel="$1"
cat "${sel}"
exit 0
}
### transform a .gph file into a gophermap
## function
serve_index(){
IDX=$1
IFS='
'
while read line; do
rline=$(echo $line | sed -r -e 's/\r//g')
case $rline in
'['*)
echo $rline | sed -r -e 's/\[//g;s/\]//g;s/\|/\t/g;s/\t//;s/$/\r/g'
;;
t*)
echo $rline | cut -c 2-
;;
*)
echo $line
esac
done < $IDX
printf ".\r\n"
exit 0
}
GOPHERDIR=${1:-"./"}
read selector
selector=$(echo $selector | sed -r 's:\$.*::g;s:\r::g' )
[ -n "$DEBUG" ] && {
echo "iGOPHERDIR: ${GOPHERDIR}"
echo "iselector: \"${selector}\""
}
case $selector in
/?*|"")
RP1=$(realpath "${GOPHERDIR}"/"${selector}" || "")
[ $? -eq 0 ] || invalid_selector "$selector"
RP2=$(realpath "${GOPHERDIR}")"${selector}"
[ $? -eq 0 ] || invalid_selector "$selector"
[ -n "$DEBUG" ] && {
echo "iRP1: ${RP1}"
echo "iRP2: ${RP2}"
}
if [ "${RP1}" = "${RP2}" ]; then
if [ -f "${RP1}" ]; then
serve_selector "${RP1}"
elif [ -d "${RP1}" ]; then
[ -f "${RP1}/gophermap" ] && serve_selector "${RP1}/gophermap"
[ -f "${RP1}/index.gph" ] && serve_index "${RP1}/index.gph"
fi
fi
invalid_selector "$selector"
;;
*)
[ -f "${GOPHERDIR}/gophermap" ] && serve_selector "${GOPHERDIR}/gophermap"
[ -f "${GOPHERDIR}/index.gph" ] && serve_index "${GOPHERDIR}/index.gph"
invalid_selector "/"
;;
esac
|
