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POShell script with CGI works fine with bash but not with sh
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  1. POShell script with CGI works fine with bash but not with sh
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    copied!<p>I have found following working example of CGI with bash. If I change first two lines to </p> <pre><code>#!/bin/sh echo "Content-type: text/html\n\n" </code></pre> <p>following the script stops working and when I browse the script in a browser the 'foo', 'bar' and 'foobar' declared at the bottom of the script disappears.</p> <p>Any idea how can I make the same example work with sh. Actually I need to run such an example over an embedded device where I don't have bash but sh.</p> <pre><code>#!/bin/bash echo -e "Content-type: text/html\n\n" echo " &lt;html&gt; &lt;body&gt; &lt;form action="http://${HTTP_HOST}:${SERVER_PORT}${SCRIPT_NAME}?foo=1234" method="POST"&gt; &lt;input type="text" name="bar"&gt; &lt;textarea name="foobar"&gt;&lt;/textarea&gt; &lt;input type="submit"&gt; &lt;/form&gt;" # (internal) routine to store POST data cgi_get_POST_vars() { # check content type # FIXME: not sure if we could handle uploads with this.. [ "${CONTENT_TYPE}" != "application/x-www-form-urlencoded" ] &amp;&amp; \ echo "Warning: you should probably use MIME type "\ "application/x-www-form-urlencoded!" 1&gt;&amp;2 # save POST variables (only first time this is called) [ -z "$QUERY_STRING_POST" \ -a "$REQUEST_METHOD" = "POST" -a ! -z "$CONTENT_LENGTH" ] &amp;&amp; \ read -n $CONTENT_LENGTH QUERY_STRING_POST return } # (internal) routine to decode urlencoded strings cgi_decodevar() { [ $# -ne 1 ] &amp;&amp; return local v t h # replace all + with whitespace and append %% t="${1//+/ }%%" while [ ${#t} -gt 0 -a "${t}" != "%" ]; do v="${v}${t%%\%*}" # digest up to the first % t="${t#*%}" # remove digested part # decode if there is anything to decode and if not at end of string if [ ${#t} -gt 0 -a "${t}" != "%" ]; then h=${t:0:2} # save first two chars t="${t:2}" # remove these v="${v}"`echo -e \\\\x${h}` # convert hex to special char fi done # return decoded string echo "${v}" return } # routine to get variables from http requests # usage: cgi_getvars method varname1 [.. varnameN] # method is either GET or POST or BOTH # the magic varible name ALL gets everything cgi_getvars() { [ $# -lt 2 ] &amp;&amp; return local q p k v s # get query case $1 in GET) [ ! -z "${QUERY_STRING}" ] &amp;&amp; q="${QUERY_STRING}&amp;" ;; POST) cgi_get_POST_vars [ ! -z "${QUERY_STRING_POST}" ] &amp;&amp; q="${QUERY_STRING_POST}&amp;" ;; BOTH) [ ! -z "${QUERY_STRING}" ] &amp;&amp; q="${QUERY_STRING}&amp;" cgi_get_POST_vars [ ! -z "${QUERY_STRING_POST}" ] &amp;&amp; q="${q}${QUERY_STRING_POST}&amp;" ;; esac shift s=" $* " # parse the query data while [ ! -z "$q" ]; do p="${q%%&amp;*}" # get first part of query string k="${p%%=*}" # get the key (variable name) from it v="${p#*=}" # get the value from it q="${q#$p&amp;*}" # strip first part from query string # decode and evaluate var if requested [ "$1" = "ALL" -o "${s/ $k /}" != "$s" ] &amp;&amp; \ eval "$k=\"`cgi_decodevar \"$v\"`\"" done return } # register all GET and POST variables cgi_getvars BOTH ALL echo "&lt;pre&gt;foo=$foo&lt;/pre&gt;" echo "&lt;pre&gt;bar=$bar&lt;/pre&gt;" echo "&lt;pre&gt;foobar=$foobar&lt;/pre&gt;" echo "&lt;/body&gt; &lt;/html&gt;" </code></pre> <p><strong>Update 1:</strong> <code>sh -x script</code> returned following:</p> <pre><code>+ echo Content-type: text/html\n\n Content-type: text/html + echo &lt;html&gt; &lt;body&gt; &lt;form action=http://:?foo=1234 method=POST&gt; &lt;input type=text name=bar&gt; &lt;textarea name=foobar&gt;&lt;/textarea&gt; &lt;input type=submit&gt; &lt;/form&gt; &lt;html&gt; &lt;body&gt; &lt;form action=http://:?foo=1234 method=POST&gt; &lt;input type=text name=bar&gt; &lt;textarea name=foobar&gt;&lt;/textarea&gt; &lt;input type=submit&gt; &lt;/form&gt; + cgi_getvars BOTH ALL + [ 2 -lt 2 ] + local q p k v s + [ ! -z ] + cgi_get_POST_vars + [ != application/x-www-form-urlencoded ] + echo Warning: you should probably use MIME type application/x-www-form-urlencoded! Warning: you should probably use MIME type application/x-www-form-urlencoded! + [ -z -a = POST -a ! -z ] + return + [ ! -z ] + shift + s= ALL + [ ! -z ] + return + echo &lt;pre&gt;foo=&lt;/pre&gt; &lt;pre&gt;foo=&lt;/pre&gt; + echo &lt;pre&gt;bar=&lt;/pre&gt; &lt;pre&gt;bar=&lt;/pre&gt; + echo &lt;pre&gt;foobar=&lt;/pre&gt; &lt;pre&gt;foobar=&lt;/pre&gt; + echo &lt;/body&gt; &lt;/html&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
 

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