[sr-dev] [kamailio/kamailio] uri.param and param.value error when last character is delimiter (#1991)

geejay101 notifications at github.com
Mon Jun 24 14:18:12 CEST 2019

### Description

I am trying to extract a parameter with transformations from an URI in Kamailio 5.2.3, Centos 7

The problem occurs with uri.param and param.value transformation when the last character of the input string is the separator. I such case an error is thrown and no parameter value can be received. The code should be fixed so that empty parameters are simply skipped.

# Example
$var(someuri) = "sip:2660926042 at;app-id=7537263245341023;";

# error with uri.param
$var(appid) = $(var(someuri){uri.param,app-id});

# another error with param.value
$var(appid) = $(var(someuri){param.value,app-id});

"Param name missing after  ;"

The problem is here where an error is thrown for zero length params:

	if(_s->len == 0) {
		LM_ERR("Param name missing after %c\n", separator);
		goto error;

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