#!/bin/sh
-# Copyright 2017 - 2018 Paul Hänsch
+# Copyright 2017 - 2020 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')"
+CR="\r"
+BR='
+'
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;'
+ local h="${BR}${cgilite_headers}"
+ [ "${h##*${BR}${1}: }" = "${h}" ] && return 1
+ h="${h##*${BR}${1}: }" h="${h%%${BR}*}"
+ printf %s "${h%${CR}}"
else
eval "printf %s \"\$HTTP_$(printf %s "${1}" |tr a-z A-Z |tr -c A-Z _)\""
fi
}
+HEX_DECODE='
+ s;\\;\\\\;g; :HEXDECODE_X; s;%([^0-9A-F]);\\045\1;g; tHEXDECODE_X;
+ # Hexadecimal { %00 - %FF } will be transformed to octal { \000 - \377 } for posix printf
+ s;%[0123].;&\\0;g; s;%[4567].;&\\1;g; s;%[89AB].;&\\2;g; s;%[CDEF].;&\\3;g;
+ s;%[048C][0-7]\\.;&0;g; s;%[048C][89A-F]\\.;&1;g; s;%[159D][0-7]\\.;&2;g; s;%[159D][89A-F]\\.;&3;g;
+ s;%[26AE][0-7]\\.;&4;g; s;%[26AE][89A-F]\\.;&5;g; s;%[37BF][0-7]\\.;&6;g; s;%[37BF][89A-F]\\.;&7;g;
+ s;%.[08](\\..);\10;g; s;%.[19](\\..);\11;g; s;%.[2A](\\..);\12;g; s;%.[3B](\\..);\13;g;
+ s;%.[4C](\\..);\14;g; s;%.[5D](\\..);\15;g; s;%.[6E](\\..);\16;g; s;%.[7F](\\..);\17;g;
+'
+
HEX_DECODE(){
- printf "$(printf %s "$1" \
- | sed -r '
- s;\\;\\\\;g; :x; s;%([^0-9A-F]);\\045\1;g; tx;
- # Hexadecimal { %00 - %FF } will be transformed to octal { \000 - \377 } for posix printf
- s;%[0123].;&\\0;g; s;%[4567].;&\\1;g; s;%[89AB].;&\\2;g; s;%[CDEF].;&\\3;g;
- s;%[048C][0-7]\\.;&0;g; s;%[048C][89A-F]\\.;&1;g; s;%[159D][0-7]\\.;&2;g; s;%[159D][89A-F]\\.;&3;g;
- s;%[26AE][0-7]\\.;&4;g; s;%[26AE][89A-F]\\.;&5;g; s;%[37BF][0-7]\\.;&6;g; s;%[37BF][89A-F]\\.;&7;g;
- s;%.[08](\\..);\10;g; s;%.[19](\\..);\11;g; s;%.[2A](\\..);\12;g; s;%.[3B](\\..);\13;g;
- s;%.[4C](\\..);\14;g; s;%.[5D](\\..);\15;g; s;%.[6E](\\..);\16;g; s;%.[7F](\\..);\17;g;
- ')"
+ printf -- "$(printf %s "$1" |sed -E "$HEX_DECODE")"
}
-if [ -z "$REQUEST_METHOD" -a -z "$SERVER_PROTOCOL" ]; then
+if [ -z "$REQUEST_METHOD" ]; then
# no webserver variables means we are running via inetd / ncat
# so use builtin web server
kill $cgilite_watchdog
PATH_INFO="$(HEX_DECODE "${REQUEST_URI%\?*}")"
QUERY_STRING="${REQUEST_URI#*\?}"
- cgilite_headers="$(sed -u '/^\r\?$/q')"
+ cgilite_headers=''; while read -r hl; do
+ [ "${hl%${CR}}" ] || break
+ cgilite_headers="${cgilite_headers}${hl}${BR}"
+ done
- HTTP_CONTENT_LENGTH="$(HEADER Content-Length |grep -xE '[0-9]+')"
+ HTTP_CONTENT_LENGTH="$(HEADER Content-Length)"
+ HTTP_CONTENT_LENGTH="${HTTP_CONTENT_LENGTH##*[^0-9]}"
export REMOTE_ADDR SERVER_NAME SERVER_PORT REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL \
PATH_INFO QUERY_STRING HTTP_CONTENT_LENGTH
# script.
cgilite_status='200 OK'; cgilite_response=''; cgilite_cl="Connection: close${CR}";
- . "$0" |sed '1{s;^Status: ;HTTP/1.1 ;; t; s;^;HTTP/1.1 200 OK\r\n;;}' \
- | while read -r l; do case $l in
+ . "$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' \
+ $CR) printf '%s %s\r\n%s%s\n\r\n' \
'HTTP/1.1' "${cgilite_status%${CR}}" \
- "$cgilite_response" "${cgilite_cl}" |tee /dev/stderr
- cat;
- [ "${cgilite_cl#Connection}" = "${cgilite_cl}" ] && exit 0 || exit 1;;
- *) cgilite_response="$cgilite_response${BR}$l";;
+ "${cgilite_response}${cgilite_response:+${BR}}" "${cgilite_cl}"
+ cat || kill $$
+ [ "${cgilite_cl#Connection}" = "${cgilite_cl}" ]; exit;;
+ *) cgilite_response="${cgilite_response:+${cgilite_response}${BR}}${l}";;
esac; done || exit 0;
(sleep $cgilite_timeout && kill $$) & cgilite_watchdog=$!
done
+ kill $cgilite_watchdog
+ exit 0
fi
if [ "$REQUEST_METHOD" = POST -a "${HTTP_CONTENT_LENGTH:=${CONTENT_LENGTH:=0}}" -gt 0 ]; then
[ -n "${DEBUG+x}" ] && env
cgilite_count(){
- case $1 in
- GET) printf %s "&${QUERY_STRING}";;
- POST) printf %s "&${cgilite_post}";;
- REF) printf %s "&${HTTP_REFERER#*\?}";;
- esac \
- | grep -Eo '&'"$2"'=[^&]*' \
+ printf %s "&$1" \
+ | grep -oE '&'"$2"'=[^&]*' \
| wc -l
}
cgilite_value(){
- HEX_DECODE "$(
- case $1 in
- GET) printf %s "&${QUERY_STRING}";;
- POST) printf %s "&${cgilite_post}";;
- REF) printf %s "&${HTTP_REFERER#*\?}";;
- esac \
- | grep -Eo '&'"$2"'=[^&]*' \
- | sed -rn "${3:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
- )"
+ local str="&$1" name="$2" cnt="${3:-1}"
+ while [ $cnt -gt 0 ]; do
+ str=${str#*&${name}=}
+ cnt=$((cnt - 1))
+ done
+ printf -- "$(printf %s "${str%%&*}" |sed -E 's;\+; ;g;'"$HEX_DECODE")"
}
-GET(){ cgilite_value GET $@; }
-GET_COUNT(){ cgilite_count GET $1; }
+cgilite_keys(){
+ local str="&$1"
+ while [ "${str#*&}" != "${str}" ]; do
+ str="${str#*&}"
+ printf '%s\n' "${str%%=*}"
+ done \
+ | sort -u
+}
+
+GET(){ cgilite_value "${QUERY_STRING}" $@; }
+GET_COUNT(){ cgilite_count "${QUERY_STRING}" $1; }
+GET_KEYS(){ cgilite_keys "${QUERY_STRING}"; }
-POST(){ cgilite_value POST $@; }
-POST_COUNT(){ cgilite_count POST $1; }
+POST(){ cgilite_value "${cgilite_post}" $@; }
+POST_COUNT(){ cgilite_count "${cgilite_post}" $1; }
+POST_KEYS(){ cgilite_keys "${cgilite_post}"; }
-REF(){ cgilite_value REF $@; }
-REF_COUNT(){ cgilite_count REF $1; }
+REF(){ cgilite_value "${HTTP_REFERER#*\?}" $@; }
+REF_COUNT(){ cgilite_count "${HTTP_REFERER#*\?}" $1; }
+REF_KEYS(){ cgilite_keys "${HTTP_REFERER#*\?}"; }
COOKIE(){
HEX_DECODE "$(
HEADER Cookie \
| grep -oE '(^|; ?)'"$1"'=[^;]*' \
- | sed -rn "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
+ | sed -En "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
)"
}
# HTML Entity Coding
# Prints UTF-8 string as decimal Unicode Code Points
# Useful for escaping user input for use in HTML text and attributes
- printf %s "$*" \
+ { [ $# -eq 0 ] && cat || printf %s "$*"; } \
| hexdump -ve '/1 "%03o\n"' \
| while read n; do
case $n in
36?) printf '%s' ${n#36};; # 4 octet (21 bit) chain start
esac
done \
- | sed -r 's;.{7};&\n;g;' \
+ | sed -E 's;.{7};&\n;g;' \
| while read n; do
printf '&#%d;' $((0$n))
done
# Code every character in URL escape hex format
# except alphanumeric ascii
- printf %s "$*" \
+ { [ $# -eq 0 ] && cat || printf %s "$*"; } \
| hexdump -v -e '/1 ",%02X"' \
- | tr , %
+ | sed 's;,;%;g; s;%2F;/;g;'
}
+PATH(){
+ { [ $# -eq 0 ] && cat || printf %s "$*"; } \
+ | sed -E 's;^.*$;/&/;; s;/+;/;g;
+ :X;
+ s;^/\.\./;/;; s;/\./;/;g;
+ tX;
+ s;/[^/]+/\.\./;/;;
+ tX;
+ s;^(/.*)/$;\1;'
+}
+
+
SET_COOKIE(){
+ local expire cookie
case "$1" in
''|0|session) expire='';;
[+-][0-9]*) expire="$(date -R -d @$(($(date +%s) + $1)))";;
}
REDIRECT(){
- printf '%s: %s\r\n'
+ printf '%s: %s\r\n' \
Status "303 See Other" \
Content-Length 0 \
Location "$*"
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