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/*
*
* 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.
*
* cleansnacs() should be called periodically by the client in order
* to facilitate the aging out of unreplied-to SNACs. This can and does
* happen, so it should be handled.
*
*/
#include <aim.h>
static aim_snacid_t aim_newsnac(aim_session_t *sess, aim_snac_t *newsnac);
/*
* Called from aim_session_init() to initialize the hash.
*/
void aim_initsnachash(aim_session_t *sess)
{
int i;
for (i = 0; i < AIM_SNAC_HASH_SIZE; i++)
sess->snac_hash[i] = NULL;
return;
}
aim_snacid_t aim_cachesnac(aim_session_t *sess, const guint16 family, const guint16 type, const guint16 flags, const void *data, const int datalen)
{
aim_snac_t snac;
snac.id = sess->snacid_next++;
snac.family = family;
snac.type = type;
snac.flags = flags;
if (datalen) {
if (!(snac.data = g_malloc(datalen)))
return 0; /* er... */
memcpy(snac.data, data, datalen);
} else
snac.data = NULL;
return aim_newsnac(sess, &snac);
}
/*
* Clones the passed snac structure and caches it in the
* list/hash.
*/
static aim_snacid_t aim_newsnac(aim_session_t *sess, aim_snac_t *newsnac)
{
aim_snac_t *snac;
int index;
if (!newsnac)
return 0;
if (!(snac = g_malloc(sizeof(aim_snac_t))))
return 0;
memcpy(snac, newsnac, sizeof(aim_snac_t));
snac->issuetime = time(NULL);
index = snac->id % AIM_SNAC_HASH_SIZE;
snac->next = (aim_snac_t *)sess->snac_hash[index];
sess->snac_hash[index] = (void *)snac;
return snac->id;
}
/*
* Finds a snac structure with the passed SNAC ID,
* removes it from the list/hash, and returns a pointer to it.
*
* The returned structure must be freed by the caller.
*
*/
aim_snac_t *aim_remsnac(aim_session_t *sess, aim_snacid_t id)
{
aim_snac_t *cur, **prev;
int index;
index = id % AIM_SNAC_HASH_SIZE;
for (prev = (aim_snac_t **)&sess->snac_hash[index]; (cur = *prev); ) {
if (cur->id == id) {
*prev = cur->next;
return cur;
} else
prev = &cur->next;
}
return cur;
}
/*
* 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.
*
*/
void aim_cleansnacs(aim_session_t *sess, int maxage)
{
int i;
for (i = 0; i < AIM_SNAC_HASH_SIZE; i++) {
aim_snac_t *cur, **prev;
time_t curtime;
if (!sess->snac_hash[i])
continue;
curtime = time(NULL); /* done here in case we waited for the lock */
for (prev = (aim_snac_t **)&sess->snac_hash[i]; (cur = *prev); ) {
if ((curtime - cur->issuetime) > maxage) {
*prev = cur->next;
/* XXX should we have destructors here? */
g_free(cur->data);
g_free(cur);
} else
prev = &cur->next;
}
}
return;
}
int aim_putsnac(aim_bstream_t *bs, guint16 family, guint16 subtype, guint16 flags, aim_snacid_t snacid)
{
aimbs_put16(bs, family);
aimbs_put16(bs, subtype);
aimbs_put16(bs, flags);
aimbs_put32(bs, snacid);
return 10;
}
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