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/*
* Purple's oscar protocol plugin
* This file is the legal property of its developers.
* Please see the AUTHORS file distributed alongside this file.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
/*
*
* 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 received.
*
* 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 "oscar.h"
/*
* Called from oscar_session_new() to initialize the hash.
*/
void aim_initsnachash(OscarData *od)
{
int i;
for (i = 0; i < FAIM_SNAC_HASH_SIZE; i++)
od->snac_hash[i] = NULL;
return;
}
aim_snacid_t aim_cachesnac(OscarData *od, const guint16 family, const guint16 type, const guint16 flags, const void *data, const int datalen)
{
aim_snac_t snac;
snac.id = od->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(od, &snac);
}
/*
* Clones the passed snac structure and caches it in the
* list/hash.
*/
aim_snacid_t aim_newsnac(OscarData *od, 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 % FAIM_SNAC_HASH_SIZE;
snac->next = (aim_snac_t *)od->snac_hash[index];
od->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(OscarData *od, aim_snacid_t id)
{
aim_snac_t *cur, **prev;
int index;
index = id % FAIM_SNAC_HASH_SIZE;
for (prev = (aim_snac_t **)&od->snac_hash[index]; (cur = *prev); ) {
if (cur->id == id) {
*prev = cur->next;
if (cur->flags & AIM_SNACFLAGS_DESTRUCTOR) {
g_free(cur->data);
cur->data = NULL;
}
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. Garbage collection. Plain and simple.
*
* maxage is the _minimum_ age in seconds to keep SNACs.
*
*/
void aim_cleansnacs(OscarData *od, int maxage)
{
int i;
for (i = 0; i < FAIM_SNAC_HASH_SIZE; i++) {
aim_snac_t *cur, **prev;
time_t curtime;
if (!od->snac_hash[i])
continue;
curtime = time(NULL); /* done here in case we waited for the lock */
for (prev = (aim_snac_t **)&od->snac_hash[i]; (cur = *prev); ) {
if ((curtime - cur->issuetime) > maxage) {
*prev = cur->next;
g_free(cur->data);
g_free(cur);
} else
prev = &cur->next;
}
}
return;
}
int aim_putsnac(ByteStream *bs, guint16 family, guint16 subtype, guint16 flags, aim_snacid_t snacid)
{
byte_stream_put16(bs, family);
byte_stream_put16(bs, subtype);
byte_stream_put16(bs, flags);
byte_stream_put32(bs, snacid);
return 10;
}
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