X-Git-Url: http://git.plutz.net/?p=cgilite;a=blobdiff_plain;f=cgilite.sh;h=86ad28073018c9a2626877e74426c0b2d4a95914;hp=c00f9e7cd930674b052e3af1d49b1ebc68562cb7;hb=5b013b64b7bbc9a62775ed861e9c8b34ffb3dfaa;hpb=498d677f03d075567beeba90707d5b9c3b5a61fc

diff --git a/cgilite.sh b/cgilite.sh
index c00f9e7..86ad280 100755
--- a/cgilite.sh
+++ b/cgilite.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# Copyright 2017 Paul Hänsch
+# Copyright 2017 - 2020 Paul Hänsch
 #
 # This is CGIlite.
 # A collection of posix shell functions for writing CGI scripts.
@@ -22,46 +22,167 @@
 # set -o posix # ksh, not portable
 setopt -o OCTAL_ZEROES 2>&-
 
-if [ "$REQUEST_METHOD" = POST -a "${HTTP_CONTENT_LENGTH:=${CONTENT_LENGTH:=0}}" -gt 0 ]; then
-  cgilite_post="$(head -c "$HTTP_CONTENT_LENGTH")"
+CR="
"
+BR='
+'
+cgilite_timeout=2
+
+PATH(){ 
+  local str seg out
+  [ $# -eq 0 ] && str="$(cat)" || str="$*"
+  while [ "$str" ]; do
+    seg=${str%%/*}; str="${str#*/}"
+    case $seg in
+      ..) out="${out%/}"; out="${out%/*}/";;
+    .|'') out="${out%/}/";;
+       *) out="${out%/}/${seg}";;
+    esac;
+    [ "$seg" = "$str" ] && break
+  done
+  [ "${str}" -a "${out}" ] && printf %s "$out" || printf %s/ "${out%/}"
+}
+
+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 "$1" |sed -E "$HEX_DECODE")"
+}
+
+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 $$) & cgilite_watchdog=$!
+  while read REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL; do
+    [ "${SERVER_PROTOCOL#HTTP/1.[01]${CR}}" ] && break
+    kill $cgilite_watchdog
+
+    SERVER_PROTOCOL="${SERVER_PROTOCOL%${CR}}"
+    PATH_INFO="$(HEX_DECODE "${REQUEST_URI%\?*}" |PATH)"
+    [ "${REQUEST_URI}" = "${REQUEST_URI#*\?}" ] \
+    && QUERY_STRING='' \
+    || QUERY_STRING="${REQUEST_URI#*\?}"
+    cgilite_headers=''; while read -r hl; do
+      hl="${hl%${CR}}"; [ "$hl" ] || break
+      case $hl in
+        'Content-Length: '*) CONTENT_LENGTH="${hl#*: }";;
+          'Content-Type: '*)   CONTENT_TYPE="${hl#*: }";;
+      esac
+      cgilite_headers="${cgilite_headers}${hl}${BR}"
+    done
+
+    export REMOTE_ADDR SERVER_NAME SERVER_PORT REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL \
+           PATH_INFO QUERY_STRING CONTENT_TYPE CONTENT_LENGTH
+
+    # Try to serve multiple requests, provided that script serves a
+    # Content-Length header.
+    # Without Content-Length header, connection will terminate after
+    # script.
+
+    cgilite_status='200 OK'; cgilite_response=''; cgilite_cl="Connection: close${CR}${BR}";
+    . "$0" | while read -r l; do case $l in
+      Status:*)
+        cgilite_status="${l#Status: }";;
+      Content-Length:*)
+        cgilite_cl=""
+        cgilite_response="${cgilite_response:+${cgilite_response}${BR}}${l}";;
+      Connection:*)
+        cgilite_cl="${l}${BR}";;
+      $CR) printf '%s %s\r\n%s%s\r\n' \
+             'HTTP/1.1' "${cgilite_status%${CR}}" \
+             "${cgilite_response}${cgilite_response:+${BR}}" "${cgilite_cl}"
+           cat || kill $$
+           [ "${cgilite_cl#Connection}" = "${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 "${CONTENT_LENGTH:-0}" -gt 0 -a \
+     "${CONTENT_TYPE}" = "application/x-www-form-urlencoded" ]; then
+  cgilite_post="$(head -c "$CONTENT_LENGTH")"
 fi
 
+[ "${DEBUG+x}" ] && env >&2
+
 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(){
-  printf "$(
-    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; s;\\;\\\\;g; s;%;\\x;g; p}'
-  )"
+  local str="&$1" name="$2" cnt="${3:-1}"
+  while [ $cnt -gt 0 ]; do
+    [ "${str}" = "${str#*&${name}=}" ] && return 1
+    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
+}
 
-POST(){ cgilite_value POST $@; }
-POST_COUNT(){ cgilite_count POST $1; }
+GET(){ cgilite_value "${QUERY_STRING}" $@; }
+GET_COUNT(){ cgilite_count "${QUERY_STRING}" $1; }
+GET_KEYS(){ cgilite_keys "${QUERY_STRING}"; }
 
-REF(){ cgilite_value REF $@; }
-REF_COUNT(){ cgilite_count REF $1; }
+POST(){ cgilite_value "${cgilite_post}" $@; }
+POST_COUNT(){ cgilite_count "${cgilite_post}" $1; }
+POST_KEYS(){ cgilite_keys "${cgilite_post}"; }
+
+REF(){ cgilite_value "${HTTP_REFERER#*\?}" $@; }
+REF_COUNT(){ cgilite_count "${HTTP_REFERER#*\?}" $1; }
+REF_KEYS(){ cgilite_keys "${HTTP_REFERER#*\?}"; }
+
+HEADER(){
+  # Read value of header line. Use this instead of
+  # referencing HTTP_* environment variables.
+  if [ -n "${cgilite_headers+x}" ]; then
+    local str="${BR}${cgilite_headers}"
+    [ "${str}" = "${str#*${BR}${1}: }" ] && return 1
+    str="${str#*${BR}${1}: }"
+    printf %s "${str%%${BR}*}"
+  else
+    local var="HTTP_$(printf %s "$1" |tr a-z- A-Z-)"
+    eval "[ \"\$$var\" ] && printf %s \"\$$var\" || return 1"
+    # eval "printf %s \"\$HTTP_$(printf %s "${1}" |tr a-z A-Z |tr -c A-Z _)\""
+  fi
+}
 
 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 '(^|; ?)'"$1"'=[^;]*' \
+    | sed -En "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
   )"
 }
 
@@ -69,19 +190,20 @@ HTML(){
   # 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
-      [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;' \
+  | sed -E 's;.{7};&\n;g;' \
   | while read n; do
     printf '&#%d;' $((0$n))
   done
@@ -91,26 +213,34 @@ URL(){
   # 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;'
 }
 
 SET_COOKIE(){
+  # Param: session | +seconds | [date]
+  # Param: name=value
+  # Param: Path= | Domain= | Secure
+  local expire 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" 
+
+  printf 'Set-Cookie: %s; HttpOnly; SameSite=Lax' "$cookie"
+  [ -n "$expire" ] && printf '; Expires=%s' "${expire%+????}${expire:+GMT}"
   [ $# -ge 3 ] && shift 2 && printf '; %s' "$@"
   printf '\r\n'
 }
 
 REDIRECT(){
-  printf 'Location: %s\r\n\r\n' "$*"
+  printf '%s: %s\r\n' \
+    Status "303 See Other" \
+    Content-Length 0 \
+    Location "$*"
+  printf '\r\n'
   exit 0
 }