<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 12 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I want to check whether a parameter exists in a header and I am using the search_hf() function defined in textops module. I am surprised that is always returning true whether the searched pattern exists or not.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To be specific, I need to check if the “received” parameter exists in the top most via header and this is how I do it. The statements inside the if block get executed all the time irrespective of whether the received parameter exists in
the top most via or not. Any help what am I doing wrong here?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">if (search_hf("Via", "received=", "f")) {<o:p></o:p></p>
<p class="MsoNormal"> xdbg("received param $sel(via.received) in top most via header \n");<o:p></o:p></p>
<p class="MsoNormal"> # perform necessary action<o:p></o:p></p>
<p class="MsoNormal"> }<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Case 1: no received parameter in via<o:p></o:p></p>
<p class="MsoNormal">Via header in response message looks like:<o:p></o:p></p>
<p class="MsoNormal">Via: SIP/2.0/UDP 192.168.1.5;branch=z9hG4bK39bc.c1076d93.0<o:p></o:p></p>
<p class="MsoNormal">Via: SIP/2.0/UDP 192.168.1.3:5060;rport=5060;branch=z9hG4bK56870034<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And the corresponding debug message from Kamailio is:<o:p></o:p></p>
<p class="MsoNormal">./sbin/kamailio[22600]: DEBUG: <script>: received param <null> in top most via header<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Case 2: received parameter exists<o:p></o:p></p>
<p class="MsoNormal">Via header in response message looks like:<o:p></o:p></p>
<p class="MsoNormal">Via: SIP/2.0/UDP 192.168.1.5;branch=z9hG4bK006e.18417697.0;received=10.139.90.137<o:p></o:p></p>
<p class="MsoNormal">Via: SIP/2.0/UDP 192.168.1.3:5060;rport=5060;branch=z9hG4bK960971659<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">And the corresponding debug message:<o:p></o:p></p>
<p class="MsoNormal">./sbin/kamailio[22600]: DEBUG: <script>: received param 10.139.90.137 in top most via header<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Ajay<o:p></o:p></p>
</div>
</body>
</html>