RUXC Module

Daniel-Constantin Mierla

asipto.com

Edited by

Daniel-Constantin Mierla


Table of Contents

1. Admin Guide
1. Overview
2. Dependencies
2.1. Kamailio Modules
2.2. External Libraries or Applications
3. Parameters
3.1. http_timeout (int)
3.2. http_tlsmode (int)
3.3. http_reuse (int)
4. Functions
4.1. ruxc_http_get(url, hdrs, respv)
4.2. ruxc_http_post(url, body, hdrs, respv)
5. Installation

List of Examples

1.1. Set http_timeout parameter
1.2. Set http_tlsmode parameter
1.3. Set http_reuse parameter
1.4. ruxc_http_get() usage
1.5. ruxc_http_post() usage
1.6. Libruxc Usage

Chapter 1. Admin Guide

1. Overview

The module exports utility functions based on libruxc.

Among them are function to perform HTTP GET and POST queries.

The ruxc project is available at: https://github.com/miconda/ruxc.

2. Dependencies

2.1. Kamailio Modules

The following modules must be installed (but not loaded) to use this module:

  • none.

2.2. External Libraries or Applications

The following libraries or applications must be installed before running Kamailio with this module loaded:

  • libruxc.

3. Parameters

3.1. http_timeout (int)

The interval in miliseconds after which the HTTP GET or POST query times out.

Default value is 5000 (5 secs).

Example 1.1. Set http_timeout parameter

...
modparam("ruxc", "http_timeout", 2000)
...

3.2. http_tlsmode (int)

The mode to connect over TLS to HTTPS sites: 0 accept all certificates; 1 - accept trusted certificates.

Default value is 0 (accept all certificates).

Example 1.2. Set http_tlsmode parameter

...
modparam("ruxc", "http_tlsmode", 1)
...

3.3. http_reuse (int)

Set to 1 in order to reuse the connection for all requests (each Kamailio process has its own connection). Useful to avoid TCP connect (and TLS handshake) when all requests are performed against the same HTTP/S server.

Default value is 0 (new connection for each request).

Example 1.3. Set http_reuse parameter

...
modparam("ruxc", "http_reuse", 1)
...

4. Functions

4.1.  ruxc_http_get(url, hdrs, respv)

Perform a HTTP GET request to "url", storing the response body in the "respv" variable. The "hdrs" can be empty string to skip setting them. The first two parameters can contain variables that are evaluated at runtime. The "respv" has to be the name of a writable variable.

The function returns response code of HTTP reply or negative value if something went wrong.

This function can be used from ANY_ROUTE.

Example 1.4. ruxc_http_get() usage

...
ruxc_http_get("http://api.com/index.php?r_uri=$(ru{s.escape.param})&f_uri=$(fu{s.escape.param})",
	   "", "X-Token: abc", "$var(result)");
switch ($rc) {
    ...
}
...

4.2.  ruxc_http_post(url, body, hdrs, respv)

Perform a HTTP POST request to "url", storing the response body in the "respv" variable. The "body" and "hdrs" can be empty strings to skip setting them. The first three parameters can contain variables that are evaluated at runtime. The "respv" has to be the name of a writable variable.

The function returns response code of HTTP reply or negative value if something went wrong.

This function can be used from ANY_ROUTE.

Example 1.5. ruxc_http_post() usage

...
ruxc_http_post("http://api.com/index.php?r_uri=$(ru{s.escape.param})&f_uri=$(fu{s.escape.param})",
	   "", "X-Token: abc", "$var(result)");
switch ($rc) {
    ...
}
...

5. Installation

The module needs "libruxc" library, which is provided by "ruxc" project from https://github.com/miconda/ruxc/. The library is implemented in Rust language, with generated C API and library. Until the libruxc is going to be packaged in OS distributions, the ruxc module can be compiled by copying ruxc.h and libruxc.a files in the folder of the module.

To generate the libruxc.a file, it requires to have Rust language installed and its environment configured, then run the following commands:

Example 1.6. Libruxc Usage

...
git clone https://github.com/miconda/ruxc
cd ruxc
cargo build --release
cp include/ruxc.h target/release/libruxc.a \
    /path/to/kamailio/src/modules/ruxc/

cd /path/to/kamailio/
make include_modules="ruxc ..." cfg
make all
make install

## or compiling individual module for use inside source tree
# make modules modules=src/modules/ruxc
...

For more details about compilation and installation of libruxc, see: https://github.com/miconda/ruxc.