auto recognize inetd mode, enabling use with busybox nc -ll

[cgilite] / cgilite.sh

diff --git a/cgilite.sh b/cgilite.sh
index 394bb8f6a24fa4723c3892a0480b82649f802fee..cac905ff6ace8ae929572c5ec8a9e69afbca54ad 100755 (executable)
--- a/cgilite.sh
+++ b/cgilite.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-# Copyright 2017 Paul Hänsch
+# Copyright 2017 - 2018 Paul Hänsch
 #
 # This is CGIlite.
 # A collection of posix shell functions for writing CGI scripts.
@@ -25,26 +25,48 @@ setopt -o OCTAL_ZEROES 2>&-
 BR="$(printf '\n')"
 CR="$(printf '\r')"
 
-if [ "$1" = '--inetd' -a -z "$REQUEST_METHOD" ]; then
-  REMOTE_ADDR="$TCPREMOTEIP"
-  SERVER_NAME="$TCPLOCALIP"
-  SERVER_PORT="$TCPLOCALPORT"
+HEADER(){
+  # Read value of header line. Use this instead of
+  # referencing HTTP_* environment variables.
+  if [ -n "${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" -a -z "$SERVER_PROTOCOL" ]; then
+  # no webserver variables means we are running via inetd / ncat
+  # so use builtin web server
+  REMOTE_ADDR="${TCPREMOTEIP:-$NCAT_REMOTE_ADDR}"
+  SERVER_NAME="${TCPLOCALIP:-$NCAT_LOCAL_ADDR}"
+  SERVER_PORT="${TCPLOCALPORT:-$NCAT_LOCAL_PORT}"
 
   read REQUEST_METHOD REQUEST_URI SERVER_PROTOCOL
-  PATH_INFO="${REQUEST_URI%\?*}"
+  PATH_INFO="$(HEX_DECODE "${REQUEST_URI%\?*}")"
   QUERY_STRING="${REQUEST_URI#*\?}"
-  HTTP_HEADERS="$(sed -u '/^\r\?$/q')"
+  cgilite_headers="$(sed -u '/^\r\?$/q')"
 
-  HTTP_CONTENT_LENGTH="$(printf %s "$HTTP_HEADERS" |grep -oiE '^Content-Length: [0-9]+')"
-  HTTP_CONTENT_LENGTH="${HTTP_CONTENT_LENGTH##*: }"
-  HTTP_COOKIE="$(printf %s "$HTTP_HEADERS" |grep -oiE '^Cookie: [^\r]+')"
-  HTTP_COOKIE="${HTTP_COOKIE##*: }"
+  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 HTTP_COOKIE
+         PATH_INFO QUERY_STRING HTTP_CONTENT_LENGTH
 
-  . "$0" |sed '1{s;^Status: ;HTTP/1.0 ;; t; iHTTP/1.0 200 OK\r
-             }'
+  . "$0" |sed '1{s;^Status: ;HTTP/1.0 ;; t; s;^;HTTP/1.0 200 OK\r\n;;}'
   exit $?
 fi
 
@@ -52,6 +74,8 @@ if [ "$REQUEST_METHOD" = POST -a "${HTTP_CONTENT_LENGTH:=${CONTENT_LENGTH:=0}}"
   cgilite_post="$(head -c "$HTTP_CONTENT_LENGTH")"
 fi
 
+[ -n "${DEBUG+x}" ] && env
+
 cgilite_count(){
   case $1 in
     GET)  printf %s "&${QUERY_STRING}";;
@@ -63,21 +87,14 @@ cgilite_count(){
 }
 
 cgilite_value(){
-  printf "$(
+  HEX_DECODE "$(
     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; s;\\;\\\\;g;
-      # 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;
-      p}'
+    | sed -rn "${3:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
   )"
 }
 
@@ -91,17 +108,10 @@ REF(){ cgilite_value REF $@; }
 REF_COUNT(){ cgilite_count REF $1; }
 
 COOKIE(){
-  printf "$(
-    printf %s " ${HTTP_COOKIE}" \
-    | grep -Eo '[; ]'"$1"'=[^;]*' \
-    | sed -rn "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; s;\\;\\\\;g;
-      # 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;
-      p}'
+  HEX_DECODE "$(
+    HEADER Cookie \
+    | grep -oE '(^|; ?)'"$1"'=[^;]*' \
+    | sed -rn "${2:-1}"'{s;^[^=]+=;;; s;\+; ;g; p;}'
   )"
 }