Functions from PJProject are not available within Asterisk

yois · May 10, 2021, 4:39am

I am working on a patch for ASTERISK-24601 to include LOCAL/REMOTE headers in dialog-info XML. I stumbled across an old post by @jcolp where he suggested that the function ast_sip_subscription_get_dialog can get the dialog info and properly generate the fields necessary, however, I am running into a problem.

The struct members returned by that function are not strings, and pjproject includes functions to extract the data into stings that can be manipluated. For example:

github.com

pjsip/pjproject/blob/ea7105c222d657d3c1f7fb18ff9130450e2e40e6/pjsip/src/pjsip/sip_msg.c#L1470


						     unsigned value )
{
    void *mem = pj_pool_alloc(pool, sizeof(pjsip_expires_hdr));
    return pjsip_expires_hdr_init(pool, mem, value);
}

///////////////////////////////////////////////////////////////////////////////
/*
 * To or From header.
 */
static int pjsip_fromto_hdr_print( pjsip_fromto_hdr *hdr, 
				   char *buf, pj_size_t size);
static pjsip_fromto_hdr* pjsip_fromto_hdr_clone( pj_pool_t *pool, 
					         const pjsip_fromto_hdr *hdr);
static pjsip_fromto_hdr* pjsip_fromto_hdr_shallow_clone( pj_pool_t *pool,
							 const pjsip_fromto_hdr *hdr);


static pjsip_hdr_vptr fromto_hdr_vptr = 
{
    (pjsip_hdr_clone_fptr) &pjsip_fromto_hdr_clone,

…is the function necessary to extract the SIP header from a remote FROM dialog. However, when attempting to use this function, I get:

implicit declaration of function ‘pjsip_fromto_hdr_print’

It think that the third-party directory that contains sip_msg.h is included in the make file, but I don’t see any modules being generated. Explicitly including the sip_msg.h does not seem to do anything either.

Any ideas?

jcolp · May 10, 2021, 9:00am

There is already a patch up for review[1].

[1] https://gerrit.asterisk.org/c/asterisk/+/15763

jcolp · May 10, 2021, 9:07am

And the reason you can’t use that function is because it is an internal function for use with PJSIP itself, it is not exposed externally.

system · June 9, 2021, 9:08am

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