libfaim/aim_snac.c


/*
 *
 * Various SNAC-related dodads... 
 *
 * outstanding_snacs is a list of aim_snac_t structs.  A SNAC should be added
 * whenever a new SNAC is sent and it should remain in the list until the
 * response for it has been receieved.
 *
 * First edition badly written by Adam Fritzler (afritz@delphid.ml.org)
 * Current edition nicely rewritten (it even works) by n (n@ml.org)
 *
 */

#include <aim.h>
#include <assert.h>

struct aim_snac_t	*aim_outstanding_snacs = NULL;
u_long	aim_snac_nextid = 0x00000001;

u_long	aim_newsnac(struct aim_snac_t *newsnac) {
	struct aim_snac_t	*snac = NULL, *cur = aim_outstanding_snacs;
  
	assert(newsnac != NULL);
	snac = calloc(1, sizeof(struct aim_snac_t));
	assert(snac != NULL);
	memcpy(snac, newsnac, sizeof(struct aim_snac_t));
	snac->issuetime = time(&snac->issuetime);
	snac->next = NULL;

	if (cur == NULL) {
		aim_outstanding_snacs = snac;
		return(snac->id);
	}
	while (cur->next != NULL)
		cur = cur->next;
	cur->next = snac;
	return(snac->id);
}

struct aim_snac_t	*aim_remsnac(u_long id) {
	struct aim_snac_t	*cur = aim_outstanding_snacs;

	if (cur == NULL)
		return(NULL);
	if (cur->id == id) {
		aim_outstanding_snacs = cur->next;
		return(cur);
	}
	while (cur->next != NULL) {
		if (cur->next->id == id) {
			struct aim_snac_t	*tmp = NULL;

			tmp = cur->next;
			cur->next = cur->next->next;
			return(tmp);
		}
		cur = cur->next;
	}
	return(NULL);
}

/*
 * This is for cleaning up old SNACs that either don't get replies or
 * a reply was never received for.  Garabage collection. Plain and simple.
 *
 * maxage is the _minimum_ age in seconds to keep SNACs (though I don't know
 * why its called _max_age).
 *
 */
int aim_cleansnacs(int maxage)
{
  struct aim_snac_t *cur = aim_outstanding_snacs;
  struct aim_snac_t *remed = NULL;
  time_t curtime;
  
  curtime = time(&curtime);

  while (cur)
    {
      if ( (cur) && (((cur->issuetime) + maxage) < curtime))
	{
#if DEBUG > 1
	  printf("aimsnac: WARNING purged obsolete snac %ul\n", cur->id);
#endif
	  remed = aim_remsnac(cur->id);
	  if (remed)
	    {
	      if (remed->data)
		free(remed->data);
	      free(remed);
	    }
	}
      cur = cur->next;
    }

  return 0;
}

int aim_putsnac(u_char *buf, int family, int subtype, int flags, u_long snacid)
{
  int curbyte = 0;
  curbyte += aimutil_put16(buf+curbyte,family&0xffff);
  curbyte += aimutil_put16(buf+curbyte,subtype&0xffff);
  curbyte += aimutil_put16(buf+curbyte,flags&0xffff);
  curbyte += aimutil_put32(buf+curbyte,snacid);
  return curbyte;
}