#!/bin/sh
-# Copyright 2017 Paul Hänsch
+# Copyright 2017 - 2018 Paul Hänsch
#
# This is CGIlite.
# A collection of posix shell functions for writing CGI scripts.
# set -o posix # ksh, not portable
setopt -o OCTAL_ZEROES 2>&-
+BR="$(printf '\n')"
+CR="$(printf '\r')"
+cgilite_timeout=2
+
+HEADER(){
+ # Read value of header line. Use this instead of
+ # referencing HTTP_* environment variables.
+ if [ -n "${cgilite_headers+x}" ]; then
+ printf %s "$cgilite_headers" \
+ | sed -rn 's;^'"${1}"': ([^\r]+)\r?$;\1;i; tX; d; :X;p;q;'
+ else
+ eval "printf %s \"\$HTTP_$(printf %s "${1}" |tr a-z A-Z |tr -c A-Z _)\""
+ fi
+}
+
+HEX_DECODE(){
+ printf "$(printf %s "$1" \
+ | sed -r '
+ s;\\;\\\\;g; :x; s;%([^0-9A-F]);\\045\1;g; tx;
+ # Hexadecimal { %00 - %FF } will be transformed to octal { \000 - \377 } for posix printf
+ s;%[0123].;&\\0;g; s;%[4567].;&\\1;g; s;%[89AB].;&\\2;g; s;%[CDEF].;&\\3;g;
+ s;%[048C][0-7]\\.;&0;g; s;%[048C][89A-F]\\.;&1;g; s;%[159D][0-7]\\.;&2;g; s;%[159D][89A-F]\\.;&3;g;
+ s;%[26AE][0-7]\\.;&4;g; s;%[26AE][89A-F]\\.;&5;g; s;%[37BF][0-7]\\.;&6;g; s;%[37BF][89A-F]\\.;&7;g;
+ s;%.[08](\\..);\10;g; s;%.[19](\\..);\11;g; s;%.[2A](\\..);\12;g; s;%.[3B](\\..);\13;g;
+ s;%.[4C](\\..);\14;g; s;%.[5D](\\..);\15;g; s;%.[6E](\\..);\16;g; s;%.[7F](\\..);\17;g;
+ ')"
+}
+
+if [ -z "$REQUEST_METHOD" ]; then
+ # no webserver variables means we are running via inetd / ncat
+ # so use builtin web server
+
+ # Use env from inetd as webserver variables
+ REMOTE_ADDR="${TCPREMOTEIP}"
+ SERVER_NAME="${TCPLOCALIP}"
+ SERVER_PORT="${TCPLOCALPORT}"
+
+ # Wait 2 seconds for request or kill connection through watchdog.
+ # Once Request is received the watchdog will be suspended (killed).
+ # At the end of the loop the watchdog will be restarted to enable
+ # timeout for the subsequent request.
+
+ (sleep $cgilite_timeout && kill $$) & cgilite_watchdog=$!
+ while read REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL; do
+ kill $cgilite_watchdog
+ PATH_INFO="$(HEX_DECODE "${REQUEST_URI%\?*}")"
+ QUERY_STRING="${REQUEST_URI#*\?}"
+ cgilite_headers="$(sed -u '/^\r\?$/q')"
+
+ HTTP_CONTENT_LENGTH="$(HEADER Content-Length |grep -xE '[0-9]+')"
+
+ export REMOTE_ADDR SERVER_NAME SERVER_PORT REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL \
+ PATH_INFO QUERY_STRING HTTP_CONTENT_LENGTH
+
+ # Try to serve multiple requests, provided that script serves a
+ # Content-Length header.
+ # Without Content-Length header, connection will terminate after
+ # script.
+
+ cgilite_status='200 OK'; cgilite_response=''; cgilite_cl="Connection: close${CR}";
+ . "$0" | while read -r l; do case $l in
+ Status:*) cgilite_status="${l#Status: }";;
+ Content-Length:*) cgilite_cl="${l}";;
+ $CR) printf '%s %s\r\n%s\n%s\n\r\n' \
+ 'HTTP/1.1' "${cgilite_status%${CR}}" \
+ "$cgilite_response" "${cgilite_cl}"
+ cat
+ [ "${cgilite_cl#Connection}" = "${cgilite_cl}" ]; exit;;
+ *) cgilite_response="$cgilite_response${BR}$l";;
+ esac; done || exit 0;
+ (sleep $cgilite_timeout && kill $$) & cgilite_watchdog=$!
+ done
+fi
+
if [ "$REQUEST_METHOD" = POST -a "${HTTP_CONTENT_LENGTH:=${CONTENT_LENGTH:=0}}" -gt 0 ]; then
cgilite_post="$(head -c "$HTTP_CONTENT_LENGTH")"
fi
+[ -n "${DEBUG+x}" ] && env
+
cgilite_count(){
case $1 in
- GET) printf %s "${QUERY_STRING}";;
- POST) printf %s "?${cgilite_post}";;
- REF) printf %s "?${HTTP_REFERER#*\?}";;
+ GET) printf %s "&${QUERY_STRING}";;
+ POST) printf %s "&${cgilite_post}";;
+ REF) printf %s "&${HTTP_REFERER#*\?}";;
esac \
- | grep -Eo '[&?]'"$2"'=[^&]*' \
+ | grep -Eo '&'"$2"'=[^&]*' \
| wc -l
}
cgilite_value(){
- printf "$(
+ HEX_DECODE "$(
case $1 in
- GET) printf %s "${QUERY_STRING}";;
- POST) printf %s "?${cgilite_post}";;
- REF) printf %s "?${HTTP_REFERER#*\?}";;
+ GET) printf %s "&${QUERY_STRING}";;
+ POST) printf %s "&${cgilite_post}";;
+ REF) printf %s "&${HTTP_REFERER#*\?}";;
esac \
- | grep -Eo '[&?]'"$2"'=[^&]*' \
- | sed -rn "${3:-1}"'{s;^[^=]+=;;; s;\+; ;g; s;\\;\\\\;g; s;%;\\x;g; p}'
+ | grep -Eo '&'"$2"'=[^&]*' \
+ | sed -rn "${3:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
)"
}
REF_COUNT(){ cgilite_count REF $1; }
COOKIE(){
- printf "$(
- printf %s " ${HTTP_COOKIE}" \
- | grep -Eo '[; ]'"$1"'=[^;]*' \
- | sed -rn "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; s;\\;\\\\;g; s;%;\\x;g; p}'
+ HEX_DECODE "$(
+ HEADER Cookie \
+ | grep -oE '(^|; ?)'"$1"'=[^;]*' \
+ | sed -rn "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
)"
}
| hexdump -ve '/1 "%03o\n"' \
| while read n; do
case $n in
- [01]??) printf '0000%s' $n;;
- 2??) printf '%s' ${n#2};;
- 3[0123]?) printf '000%s' ${n#3};;
- 34?) printf '00%s' ${n#34};;
- 35?) printf '01%s' ${n#35};;
- 36?) printf '%s' ${n#36};;
+ # bitbanging octal UTF-8 chains into singular 7 digit octal numbers
+ [01]??) printf '0000%s' $n;; # 7 bit ASCII character, nothing to do
+ 2??) printf '%s' ${n#2};; # tail fragment, append 6 bit
+ 3[0123]?) printf '000%s' ${n#3};; # 2 octet (11 bit) chain start
+ 34?) printf '00%s' ${n#34};; # 3 octet (16 bit) chain start
+ 35?) printf '01%s' ${n#35};; # 3 octet chain start, high
+ 36?) printf '%s' ${n#36};; # 4 octet (21 bit) chain start
esac
done \
| sed -r 's;.{7};&\n;g;' \
| tr , %
}
+PATH(){
+ printf %s "$1" \
+ | sed -r 's;^.*$;/&/;; s;/+;/;g;
+ :X;
+ s;^/../;/;; s;/./;/;g;
+ tX;
+ s;/[^/]+/../;/;;
+ tX;
+ s;^(/.*)/$;\1;'
+}
+
+
SET_COOKIE(){
case "$1" in
''|0|session) expire='';;
[+-][0-9]*) expire="$(date -R -d @$(($(date +%s) + $1)))";;
- *) expire="$(date -R -d "$1")";;
+ *) expire="$(date -R -d "$1")";;
esac
cookie="$2"
-
+
printf 'Set-Cookie: %s' "$cookie"
- [ -n "$expire" ] && printf '; Expires=%s' "$expire"
+ [ -n "$expire" ] && printf '; Expires=%s' "${expire%+????}${expire:+GMT}"
[ $# -ge 3 ] && shift 2 && printf '; %s' "$@"
printf '\r\n'
}
REDIRECT(){
- printf '%s 303 See Other\r\nLocation: %s\r\n\r\n' "$SERVER_PROTOCOL" "$*"
+ printf '%s: %s\r\n' \
+ Status "303 See Other" \
+ Content-Length 0 \
+ Location "$*"
+ printf '\r\n'
exit 0
}
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