3 # Copyright 2017 - 2018 Paul Hänsch
6 # A collection of posix shell functions for writing CGI scripts.
8 # CGIlite is free software: you can redistribute it and/or modify
9 # it under the terms of the GNU Affero General Public License as published by
10 # the Free Software Foundation, either version 3 of the License, or
11 # (at your option) any later version.
13 # CGIlite is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU Affero General Public License for more details.
18 # You should have received a copy of the GNU Affero General Public License
19 # along with CGIlite. If not, see <http://www.gnu.org/licenses/>.
21 # ksh and zsh workaround
22 # set -o posix # ksh, not portable
23 setopt -o OCTAL_ZEROES 2>&-
31 # Read value of header line. Use this instead of
32 # referencing HTTP_* environment variables.
33 if [ -n "${cgilite_headers+x}" ]; then
34 printf %s "$cgilite_headers" \
35 | sed -En 's;^'"${1}"': ([^\r]+)\r?$;\1;i; tX; d; :X;p;q;'
37 eval "printf %s \"\$HTTP_$(printf %s "${1}" |tr a-z A-Z |tr -c A-Z _)\""
42 s;\\;\\\\;g; :HEXDECODE_X; s;%([^0-9A-F]);\\045\1;g; tHEXDECODE_X;
43 # Hexadecimal { %00 - %FF } will be transformed to octal { \000 - \377 } for posix printf
44 s;%[0123].;&\\0;g; s;%[4567].;&\\1;g; s;%[89AB].;&\\2;g; s;%[CDEF].;&\\3;g;
45 s;%[048C][0-7]\\.;&0;g; s;%[048C][89A-F]\\.;&1;g; s;%[159D][0-7]\\.;&2;g; s;%[159D][89A-F]\\.;&3;g;
46 s;%[26AE][0-7]\\.;&4;g; s;%[26AE][89A-F]\\.;&5;g; s;%[37BF][0-7]\\.;&6;g; s;%[37BF][89A-F]\\.;&7;g;
47 s;%.[08](\\..);\10;g; s;%.[19](\\..);\11;g; s;%.[2A](\\..);\12;g; s;%.[3B](\\..);\13;g;
48 s;%.[4C](\\..);\14;g; s;%.[5D](\\..);\15;g; s;%.[6E](\\..);\16;g; s;%.[7F](\\..);\17;g;
52 printf -- "$(printf %s "$1" |sed -E "$HEX_DECODE")"
55 if [ -z "$REQUEST_METHOD" ]; then
56 # no webserver variables means we are running via inetd / ncat
57 # so use builtin web server
59 # Use env from inetd as webserver variables
60 REMOTE_ADDR="${TCPREMOTEIP}"
61 SERVER_NAME="${TCPLOCALIP}"
62 SERVER_PORT="${TCPLOCALPORT}"
64 # Wait 2 seconds for request or kill connection through watchdog.
65 # Once Request is received the watchdog will be suspended (killed).
66 # At the end of the loop the watchdog will be restarted to enable
67 # timeout for the subsequent request.
69 (sleep $cgilite_timeout && kill $$) & cgilite_watchdog=$!
70 while read REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL; do
71 kill $cgilite_watchdog
72 PATH_INFO="$(HEX_DECODE "${REQUEST_URI%\?*}")"
73 QUERY_STRING="${REQUEST_URI#*\?}"
74 cgilite_headers="$(while read -r hl; do [ "${hl%${CR}}" ] && printf '%s\n' "$hl" || break; done )"
76 HTTP_CONTENT_LENGTH="$(HEADER Content-Length |grep -xE '[0-9]+')"
78 export REMOTE_ADDR SERVER_NAME SERVER_PORT REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL \
79 PATH_INFO QUERY_STRING HTTP_CONTENT_LENGTH
81 # Try to serve multiple requests, provided that script serves a
82 # Content-Length header.
83 # Without Content-Length header, connection will terminate after
86 cgilite_status='200 OK'; cgilite_response=''; cgilite_cl="Connection: close${CR}";
87 . "$0" | while read -r l; do case $l in
88 Status:*) cgilite_status="${l#Status: }";;
89 Content-Length:*) cgilite_cl="${l}";;
90 $CR) printf '%s %s\r\n%s\n%s\n\r\n' \
91 'HTTP/1.1' "${cgilite_status%${CR}}" \
92 "$cgilite_response" "${cgilite_cl}"
94 [ "${cgilite_cl#Connection}" = "${cgilite_cl}" ]; exit;;
95 *) cgilite_response="${cgilite_response:+${cgilite_response}${BR}}${l}";;
97 (sleep $cgilite_timeout && kill $$) & cgilite_watchdog=$!
101 if [ "$REQUEST_METHOD" = POST -a "${HTTP_CONTENT_LENGTH:=${CONTENT_LENGTH:=0}}" -gt 0 ]; then
102 cgilite_post="$(head -c "$HTTP_CONTENT_LENGTH")"
105 [ -n "${DEBUG+x}" ] && env
109 | grep -oE '&'"$2"'=[^&]*' \
114 local str="&$1" name="$2" cnt="${3:-1}"
115 while [ $cnt -gt 0 ]; do
116 str=${str#*&${name}=}
119 printf -- "$(printf %s "${str%%&*}" |sed -E 's;\+; ;g;'"$HEX_DECODE")"
124 while [ "${str#*&}" != "${str}" ]; do
126 printf '%s\n' "${str%%=*}"
131 GET(){ cgilite_value "${QUERY_STRING}" $@; }
132 GET_COUNT(){ cgilite_count "${QUERY_STRING}" $1; }
133 GET_KEYS(){ cgilite_keys "${QUERY_STRING}"; }
135 POST(){ cgilite_value "${cgilite_post}" $@; }
136 POST_COUNT(){ cgilite_count "${cgilite_post}" $1; }
137 POST_KEYS(){ cgilite_keys "${cgilite_post}"; }
139 REF(){ cgilite_value "${HTTP_REFERER#*\?}" $@; }
140 REF_COUNT(){ cgilite_count "${HTTP_REFERER#*\?}" $1; }
141 REF_KEYS(){ cgilite_keys "${HTTP_REFERER#*\?}"; }
146 | grep -oE '(^|; ?)'"$1"'=[^;]*' \
147 | sed -En "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
153 # Prints UTF-8 string as decimal Unicode Code Points
154 # Useful for escaping user input for use in HTML text and attributes
155 { [ $# -eq 0 ] && cat || printf %s "$*"; } \
156 | hexdump -ve '/1 "%03o\n"' \
159 # bitbanging octal UTF-8 chains into singular 7 digit octal numbers
160 [01]??) printf '0000%s' $n;; # 7 bit ASCII character, nothing to do
161 2??) printf '%s' ${n#2};; # tail fragment, append 6 bit
162 3[0123]?) printf '000%s' ${n#3};; # 2 octet (11 bit) chain start
163 34?) printf '00%s' ${n#34};; # 3 octet (16 bit) chain start
164 35?) printf '01%s' ${n#35};; # 3 octet chain start, high
165 36?) printf '%s' ${n#36};; # 4 octet (21 bit) chain start
168 | sed -E 's;.{7};&\n;g;' \
170 printf '&#%d;' $((0$n))
175 # Code every character in URL escape hex format
176 # except alphanumeric ascii
178 { [ $# -eq 0 ] && cat || printf %s "$*"; } \
179 | hexdump -v -e '/1 ",%02X"' \
180 | sed 's;,;%;g; s;%2F;/;g;'
184 { [ $# -eq 0 ] && cat || printf %s "$*"; } \
185 | sed -E 's;^.*$;/&/;; s;/+;/;g;
187 s;^/\.\./;/;; s;/\./;/;g;
198 ''|0|session) expire='';;
199 [+-][0-9]*) expire="$(date -R -d @$(($(date +%s) + $1)))";;
200 *) expire="$(date -R -d "$1")";;
204 printf 'Set-Cookie: %s' "$cookie"
205 [ -n "$expire" ] && printf '; Expires=%s' "${expire%+????}${expire:+GMT}"
206 [ $# -ge 3 ] && shift 2 && printf '; %s' "$@"
211 printf '%s: %s\r\n' \
212 Status "303 See Other" \