[Question] Is there a mechanism to capture raw SIP trace via callback (instead of stdout)?

[deretame]

Hi,

I am embedding baresip into a custom host application (using it as a library). I have a requirement to capture and process the raw SIP traffic programmatically—for example, to store it in a custom database or display it in a UI.

I know uag_enable_sip_trace(true) works well for debugging, but it outputs directly to stdout/stderr or the system log.

My Question:
Is there a recommended way or an existing API in baresip (or re) to register a sink/callback for SIP tracing?

Ideally, I am looking for a way to intercept the sip_msg or the raw mbuf before (or while) it is being printed.

For example:

// Pseudo-code
void my_sip_trace_handler(const struct sip_msg *msg, bool incoming, void *arg) {
    // Copy data for application usage
}

// Does an API like this exist?
sip_register_trace_handler(my_sip_trace_handler);

Or should I look into overriding the global dbg print handlers in libre?

Any pointers on the best practice to achieve this would be appreciated.

[alfredh]

hi

there are a couple of options:

1. change re_printf to debug/info and use the log API to register a callback handler:

static void sip_trace_handler(bool tx, enum sip_transp tp,
			      const struct sa *src, const struct sa *dst,
			      const uint8_t *pkt, size_t len, void *arg)
{
	(void)tx;
	(void)arg;

	re_printf("\x1b[36;1m"
		  "%H#\n"
		  "%s %J -> %J\n"
		  "%b"
		  "\x1b[;m\n"
		  ,
		  fmt_timestamp, NULL,
		  sip_transp_name(tp), src, dst, pkt, len);
}

2. register your own SIP trace callback handler in your application, using this api:

	sip_set_trace_handler(uag.sip, enable ? sip_trace_handler : NULL);

[deretame]

Ah, I totally missed this notification! Sorry for the late reply.

This is exactly what I was looking for (sip_set_trace_handler). Thanks a lot for pointing it out!"