3 # Copyright 2017 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>&-
29 if [ -n "$cgilite_headers+x" ]; then
30 printf %s "$cgilite_headers" \
31 | sed -rn 's;^'"${1}"': ([^\r]+)\r?$;\1;ip;q;'
33 eval $(printf 'printf $HTTP_'; printf '%s' "${1}" |tr '[a-z]-' '[A-Z]_')
37 if [ "$1" = '--inetd' -a -z "$REQUEST_METHOD" ]; then
38 REMOTE_ADDR="${TCPREMOTEIP:-$NCAT_REMOTE_ADDR}"
39 SERVER_NAME="${TCPLOCALIP:-$NCAT_LOCAL_ADDR}"
40 SERVER_PORT="${TCPLOCALPORT:-$NCAT_LOCAL_PORT}"
42 read REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL
43 PATH_INFO="${REQUEST_URI%\?*}"
44 QUERY_STRING="${REQUEST_URI#*\?}"
45 cgilite_headers="$(sed -u '/^\r\?$/q')"
47 HTTP_CONTENT_LENGTH="$(HEADER Content-Length |grep -xE '[0-9]+')"
48 HTTP_COOKIE="$(HEADER Cookie)"
50 export REMOTE_ADDR SERVER_NAME SERVER_PORT REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL \
51 PATH_INFO QUERY_STRING HTTP_CONTENT_LENGTH HTTP_COOKIE
53 . "$0" |sed '1{s;^Status: ;HTTP/1.0 ;; t; iHTTP/1.0 200 OK\r
58 if [ "$REQUEST_METHOD" = POST -a "${HTTP_CONTENT_LENGTH:=${CONTENT_LENGTH:=0}}" -gt 0 ]; then
59 cgilite_post="$(head -c "$HTTP_CONTENT_LENGTH")"
62 [ -n "${DEBUG+x}" ] && env
66 GET) printf %s "&${QUERY_STRING}";;
67 POST) printf %s "&${cgilite_post}";;
68 REF) printf %s "&${HTTP_REFERER#*\?}";;
70 | grep -Eo '&'"$2"'=[^&]*' \
77 GET) printf %s "&${QUERY_STRING}";;
78 POST) printf %s "&${cgilite_post}";;
79 REF) printf %s "&${HTTP_REFERER#*\?}";;
81 | grep -Eo '&'"$2"'=[^&]*' \
82 | sed -rn "${3:-1}"'{s;^[^=]+=;;; s;\+; ;g; s;\\;\\\\;g;
83 # Hexadecimal { %00 - %FF } will be transformed to octal { \000 - \377 } for posix printf
84 s;%[0123].;&\\0;g; s;%[4567].;&\\1;g; s;%[89AB].;&\\2;g; s;%[CDEF].;&\\3;g;
85 s;%[048C][0-7]\\.;&0;g; s;%[048C][89A-F]\\.;&1;g; s;%[159D][0-7]\\.;&2;g; s;%[159D][89A-F]\\.;&3;g;
86 s;%[26AE][0-7]\\.;&4;g; s;%[26AE][89A-F]\\.;&5;g; s;%[37BF][0-7]\\.;&6;g; s;%[37BF][89A-F]\\.;&7;g;
87 s;%.[08](\\..);\10;g; s;%.[19](\\..);\11;g; s;%.[2A](\\..);\12;g; s;%.[3B](\\..);\13;g;
88 s;%.[4C](\\..);\14;g; s;%.[5D](\\..);\15;g; s;%.[6E](\\..);\16;g; s;%.[7F](\\..);\17;g;
93 GET(){ cgilite_value GET $@; }
94 GET_COUNT(){ cgilite_count GET $1; }
96 POST(){ cgilite_value POST $@; }
97 POST_COUNT(){ cgilite_count POST $1; }
99 REF(){ cgilite_value REF $@; }
100 REF_COUNT(){ cgilite_count REF $1; }
105 | grep -oE '(^|; ?)'"$1"'=[^;]*' \
106 | sed -rn "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; s;\\;\\\\;g;
107 # Hexadecimal { %00 - %FF } will be transformed to octal { \000 - \377 } for posix printf
108 s;%[0123].;&\\0;g; s;%[4567].;&\\1;g; s;%[89AB].;&\\2;g; s;%[CDEF].;&\\3;g;
109 s;%[048C][0-7]\\.;&0;g; s;%[048C][89A-F]\\.;&1;g; s;%[159D][0-7]\\.;&2;g; s;%[159D][89A-F]\\.;&3;g;
110 s;%[26AE][0-7]\\.;&4;g; s;%[26AE][89A-F]\\.;&5;g; s;%[37BF][0-7]\\.;&6;g; s;%[37BF][89A-F]\\.;&7;g;
111 s;%.[08](\\..);\10;g; s;%.[19](\\..);\11;g; s;%.[2A](\\..);\12;g; s;%.[3B](\\..);\13;g;
112 s;%.[4C](\\..);\14;g; s;%.[5D](\\..);\15;g; s;%.[6E](\\..);\16;g; s;%.[7F](\\..);\17;g;
119 # Prints UTF-8 string as decimal Unicode Code Points
120 # Useful for escaping user input for use in HTML text and attributes
122 | hexdump -ve '/1 "%03o\n"' \
125 # bitbanging octal UTF-8 chains into singular 7 digit octal numbers
126 [01]??) printf '0000%s' $n;; # 7 bit ASCII character, nothing to do
127 2??) printf '%s' ${n#2};; # tail fragment, append 6 bit
128 3[0123]?) printf '000%s' ${n#3};; # 2 octet (11 bit) chain start
129 34?) printf '00%s' ${n#34};; # 3 octet (16 bit) chain start
130 35?) printf '01%s' ${n#35};; # 3 octet chain start, high
131 36?) printf '%s' ${n#36};; # 4 octet (21 bit) chain start
134 | sed -r 's;.{7};&\n;g;' \
136 printf '&#%d;' $((0$n))
141 # Code every character in URL escape hex format
142 # except alphanumeric ascii
145 | hexdump -v -e '/1 ",%02X"' \
151 ''|0|session) expire='';;
152 [+-][0-9]*) expire="$(date -R -d @$(($(date +%s) + $1)))";;
153 *) expire="$(date -R -d "$1")";;
157 printf 'Set-Cookie: %s' "$cookie"
158 [ -n "$expire" ] && printf '; Expires=%s' "$expire"
159 [ $# -ge 3 ] && shift 2 && printf '; %s' "$@"
164 printf 'Status: 303 See Other\r\nLocation: %s\r\n\r\n' "$*"