source: protocols/oscar/ssi.c @ 6f903c3

/*
 * Server-Side/Stored Information.
 *
 * Relatively new facility that allows storing of certain types of information,
 * such as a users buddy list, permit/deny list, and permit/deny preferences,
 * to be stored on the server, so that they can be accessed from any client.
 *
 * We keep a copy of the ssi data in sess->ssi, because the data needs to be
 * accessed for various reasons.  So all the "aim_ssi_itemlist_bleh" functions
 * near the top just manage the local data.
 *
 * The SNAC sending and receiving functions are lower down in the file, and
 * they're simpler.  They are in the order of the subtypes they deal with,
 * starting with the request rights function (subtype 0x0002), then parse
 * rights (subtype 0x0003), then--well, you get the idea.
 *
 * This is entirely too complicated.
 * You don't know the half of it.
 *
 * XXX - Test for memory leaks
 * XXX - Better parsing of rights, and use the rights info to limit adds
 *
 */

#include <aim.h>
#include "ssi.h"

/**
 * Locally add a new item to the given item list.
 *
 * @param list A pointer to a pointer to the current list of items.
 * @param parent A pointer to the parent group, or NULL if the item should have no
 *        parent group (ie. the group ID# should be 0).
 * @param name A null terminated string of the name of the new item, or NULL if the
 *        item should have no name.
 * @param type The type of the item, 0x0001 for a contact, 0x0002 for a group, etc.
 * @return The newly created item.
 */
static struct aim_ssi_item *aim_ssi_itemlist_add(struct aim_ssi_item **list, struct aim_ssi_item *parent, char *name,
                                                 guint16 type)
{
        int i;
        struct aim_ssi_item *cur, *newitem;

        if (!(newitem = g_new0(struct aim_ssi_item, 1))) {
                return NULL;
        }

        /* Set the name */
        if (name) {
                if (!(newitem->name = (char *) g_malloc((strlen(name) + 1) * sizeof(char)))) {
                        g_free(newitem);
                        return NULL;
                }
                strcpy(newitem->name, name);
        } else {
                newitem->name = NULL;
        }

        /* Set the group ID# and the buddy ID# */
        newitem->gid = 0x0000;
        newitem->bid = 0x0000;
        if (type == AIM_SSI_TYPE_GROUP) {
                if (name) {
                        do {
                                newitem->gid += 0x0001;
                                for (cur = *list, i = 0; ((cur) && (!i)); cur = cur->next) {
                                        if ((cur->gid == newitem->gid) && (cur->gid == newitem->gid)) {
                                                i = 1;
                                        }
                                }
                        } while (i);
                }
        } else {
                if (parent) {
                        newitem->gid = parent->gid;
                }
                do {
                        newitem->bid += 0x0001;
                        for (cur = *list, i = 0; ((cur) && (!i)); cur = cur->next) {
                                if ((cur->bid == newitem->bid) && (cur->gid == newitem->gid)) {
                                        i = 1;
                                }
                        }
                } while (i);
        }

        /* Set the rest */
        newitem->type = type;
        newitem->data = NULL;
        newitem->next = *list;
        *list = newitem;

        return newitem;
}

/**
 * Locally rebuild the 0x00c8 TLV in the additional data of the given group.
 *
 * @param list A pointer to a pointer to the current list of items.
 * @param parentgroup A pointer to the group who's additional data you want to rebuild.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static int aim_ssi_itemlist_rebuildgroup(struct aim_ssi_item **list, struct aim_ssi_item *parentgroup)
{
        int newlen; //, i;
        struct aim_ssi_item *cur;

        /* Free the old additional data */
        if (parentgroup->data) {
                aim_freetlvchain((aim_tlvlist_t **) &parentgroup->data);
                parentgroup->data = NULL;
        }

        /* Find the length for the new additional data */
        newlen = 0;
        if (parentgroup->gid == 0x0000) {
                for (cur = *list; cur; cur = cur->next) {
                        if ((cur->gid != 0x0000) && (cur->type == AIM_SSI_TYPE_GROUP)) {
                                newlen += 2;
                        }
                }
        } else {
                for (cur = *list; cur; cur = cur->next) {
                        if ((cur->gid == parentgroup->gid) && (cur->type == AIM_SSI_TYPE_BUDDY)) {
                                newlen += 2;
                        }
                }
        }

        /* Rebuild the additional data */
        if (newlen > 0) {
                guint8 *newdata;

                if (!(newdata = (guint8 *) g_malloc((newlen) * sizeof(guint8)))) {
                        return -ENOMEM;
                }
                newlen = 0;
                if (parentgroup->gid == 0x0000) {
                        for (cur = *list; cur; cur = cur->next) {
                                if ((cur->gid != 0x0000) && (cur->type == AIM_SSI_TYPE_GROUP)) {
                                        newlen += aimutil_put16(newdata + newlen, cur->gid);
                                }
                        }
                } else {
                        for (cur = *list; cur; cur = cur->next) {
                                if ((cur->gid == parentgroup->gid) && (cur->type == AIM_SSI_TYPE_BUDDY)) {
                                        newlen += aimutil_put16(newdata + newlen, cur->bid);
                                }
                        }
                }
                aim_addtlvtochain_raw((aim_tlvlist_t **) &(parentgroup->data), 0x00c8, newlen, newdata);

                g_free(newdata);
        }

        return 0;
}

/**
 * Locally free all of the stored buddy list information.
 *
 * @param sess The oscar session.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static int aim_ssi_freelist(aim_session_t *sess)
{
        struct aim_ssi_item *cur, *delitem;

        cur = sess->ssi.items;
        while (cur) {
                if (cur->name) {
                        g_free(cur->name);
                }
                if (cur->data) {
                        aim_freetlvchain((aim_tlvlist_t **) &cur->data);
                }
                delitem = cur;
                cur = cur->next;
                g_free(delitem);
        }

        sess->ssi.items = NULL;
        sess->ssi.revision = 0;
        sess->ssi.timestamp = (time_t) 0;

        return 0;
}

/**
 * Locally find an item given a group ID# and a buddy ID#.
 *
 * @param list A pointer to the current list of items.
 * @param gid The group ID# of the desired item.
 * @param bid The buddy ID# of the desired item.
 * @return Return a pointer to the item if found, else return NULL;
 */
struct aim_ssi_item *aim_ssi_itemlist_find(struct aim_ssi_item *list, guint16 gid, guint16 bid)
{
        struct aim_ssi_item *cur;

        for (cur = list; cur; cur = cur->next) {
                if ((cur->gid == gid) && (cur->bid == bid)) {
                        return cur;
                }
        }
        return NULL;
}

/**
 * Locally find an item given a group name, screen name, and type.  If group name
 * and screen name are null, then just return the first item of the given type.
 *
 * @param list A pointer to the current list of items.
 * @param gn The group name of the desired item.
 * @param bn The buddy name of the desired item.
 * @param type The type of the desired item.
 * @return Return a pointer to the item if found, else return NULL;
 */
struct aim_ssi_item *aim_ssi_itemlist_finditem(struct aim_ssi_item *list, char *gn, char *sn, guint16 type)
{
        struct aim_ssi_item *cur;

        if (!list) {
                return NULL;
        }

        if (gn && sn) { /* For finding buddies in groups */
                for (cur = list; cur; cur = cur->next) {
                        if ((cur->type == type) && (cur->name) && !(aim_sncmp(cur->name, sn))) {
                                struct aim_ssi_item *curg;
                                for (curg = list; curg; curg = curg->next) {
                                        if ((curg->type == AIM_SSI_TYPE_GROUP) && (curg->gid == cur->gid) &&
                                            (curg->name) && !(aim_sncmp(curg->name, gn))) {
                                                return cur;
                                        }
                                }
                        }
                }

        } else if (sn) { /* For finding groups, permits, denies, and ignores */
                for (cur = list; cur; cur = cur->next) {
                        if ((cur->type == type) && (cur->name) && !(aim_sncmp(cur->name, sn))) {
                                return cur;
                        }
                }

                /* For stuff without names--permit deny setting, visibility mask, etc. */
        } else { for (cur = list; cur; cur = cur->next) {
                         if (cur->type == type) {
                                 return cur;
                         }
                 }
        }

        return NULL;
}

/**
 * Locally find the parent item of the given buddy name.
 *
 * @param list A pointer to the current list of items.
 * @param bn The buddy name of the desired item.
 * @return Return a pointer to the item if found, else return NULL;
 */
struct aim_ssi_item *aim_ssi_itemlist_findparent(struct aim_ssi_item *list, char *sn)
{
        struct aim_ssi_item *cur, *curg;

        if (!list || !sn) {
                return NULL;
        }
        if (!(cur = aim_ssi_itemlist_finditem(list, NULL, sn, AIM_SSI_TYPE_BUDDY))) {
                return NULL;
        }
        for (curg = list; curg; curg = curg->next) {
                if ((curg->type == AIM_SSI_TYPE_GROUP) && (curg->gid == cur->gid)) {
                        return curg;
                }
        }
        return NULL;
}

/**
 * Locally find the permit/deny setting item, and return the setting.
 *
 * @param list A pointer to the current list of items.
 * @return Return the current SSI permit deny setting, or 0 if no setting was found.
 */
int aim_ssi_getpermdeny(struct aim_ssi_item *list)
{
        struct aim_ssi_item *cur = aim_ssi_itemlist_finditem(list, NULL, NULL, AIM_SSI_TYPE_PDINFO);

        if (cur) {
                aim_tlvlist_t *tlvlist = cur->data;
                if (tlvlist) {
                        aim_tlv_t *tlv = aim_gettlv(tlvlist, 0x00ca, 1);
                        if (tlv && tlv->value) {
                                return aimutil_get8(tlv->value);
                        }
                }
        }
        return 0;
}

/**
 * Add the given packet to the holding queue.  We totally need to send SSI SNACs one at
 * a time, so we have a local queue where packets get put before they are sent, and
 * then we send stuff one at a time, nice and orderly-like.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param fr The newly created SNAC that you want to send.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static int aim_ssi_enqueue(aim_session_t *sess, aim_conn_t *conn, aim_frame_t *fr)
{
        aim_frame_t *cur;

        if (!sess || !conn || !fr) {
                return -EINVAL;
        }

        fr->next = NULL;
        if (sess->ssi.holding_queue == NULL) {
                sess->ssi.holding_queue = fr;
                if (!sess->ssi.waiting_for_ack) {
                        aim_ssi_modbegin(sess, conn);
                }
        } else {
                for (cur = sess->ssi.holding_queue; cur->next; cur = cur->next) {
                        ;
                }
                cur->next = fr;
        }

        return 0;
}

/**
 * Send the next SNAC from the holding queue.  This is called
 * automatically when an ack from an add, mod, or del is received.
 * If the queue is empty, it sends the modend SNAC.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @return Return 0 if no errors, otherwise return the error number.
 */
static int aim_ssi_dispatch(aim_session_t *sess, aim_conn_t *conn)
{
        aim_frame_t *cur;

        if (!sess || !conn) {
                return -EINVAL;
        }

        if (!sess->ssi.waiting_for_ack) {
                if (sess->ssi.holding_queue) {
                        sess->ssi.waiting_for_ack = 1;
                        cur = sess->ssi.holding_queue->next;
                        sess->ssi.holding_queue->next = NULL;
                        aim_tx_enqueue(sess, sess->ssi.holding_queue);
                        sess->ssi.holding_queue = cur;
                } else {
                        aim_ssi_modend(sess, conn);
                }
        }

        return 0;
}

/**
 * Add an array of screen names to the given group.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param gn The name of the group to which you want to add these names.
 * @param sn An array of null terminated strings of the names you want to add.
 * @param num The number of screen names you are adding (size of the sn array).
 * @param flags 1 - Add with TLV(0x66)
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_addbuddies(aim_session_t *sess, aim_conn_t *conn, char *gn, char **sn, unsigned int num, unsigned int flags)
{
        struct aim_ssi_item *parentgroup, **newitems;
        guint16 i;

        if (!sess || !conn || !gn || !sn || !num) {
                return -EINVAL;
        }

        /* Look up the parent group */
        if (!(parentgroup = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, gn, AIM_SSI_TYPE_GROUP))) {
                aim_ssi_addgroups(sess, conn, &gn, 1);
                if (!(parentgroup = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, gn, AIM_SSI_TYPE_GROUP))) {
                        return -ENOMEM;
                }
        }

        /* Allocate an array of pointers to each of the new items */
        if (!(newitems = g_new0(struct aim_ssi_item *, num))) {
                return -ENOMEM;
        }

        /* Add items to the local list, and index them in the array */
        for (i = 0; i < num; i++) {
                if (!(newitems[i] = aim_ssi_itemlist_add(&sess->ssi.items, parentgroup, sn[i], AIM_SSI_TYPE_BUDDY))) {
                        g_free(newitems);
                        return -ENOMEM;
                } else if (flags & 1) {
                        aim_tlvlist_t *tl = NULL;
                        aim_addtlvtochain_noval(&tl, 0x66);
                        newitems[i]->data = tl;
                }
        }

        /* Send the add item SNAC */
        if ((i = aim_ssi_addmoddel(sess, conn, newitems, num, AIM_CB_SSI_ADD))) {
                g_free(newitems);
                return -i;
        }

        /* Free the array of pointers to each of the new items */
        g_free(newitems);

        /* Rebuild the additional data in the parent group */
        if ((i = aim_ssi_itemlist_rebuildgroup(&sess->ssi.items, parentgroup))) {
                return i;
        }

        /* Send the mod item SNAC */
        if ((i = aim_ssi_addmoddel(sess, conn, &parentgroup, 1, AIM_CB_SSI_MOD))) {
                return i;
        }

        /* Begin sending SSI SNACs */
        if (!(i = aim_ssi_dispatch(sess, conn))) {
                return i;
        }

        return 0;
}

/**
 * Add the master group (the group containing all groups).  This is called by
 * aim_ssi_addgroups, if necessary.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_addmastergroup(aim_session_t *sess, aim_conn_t *conn)
{
        struct aim_ssi_item *newitem;

        if (!sess || !conn) {
                return -EINVAL;
        }

        /* Add the item to the local list, and keep a pointer to it */
        if (!(newitem = aim_ssi_itemlist_add(&sess->ssi.items, NULL, NULL, AIM_SSI_TYPE_GROUP))) {
                return -ENOMEM;
        }

        /* If there are any existing groups (technically there shouldn't be, but */
        /* just in case) then add their group ID#'s to the additional data */
        aim_ssi_itemlist_rebuildgroup(&sess->ssi.items, newitem);

        /* Send the add item SNAC */
        aim_ssi_addmoddel(sess, conn, &newitem, 1, AIM_CB_SSI_ADD);

        /* Begin sending SSI SNACs */
        aim_ssi_dispatch(sess, conn);

        return 0;
}

/**
 * Add an array of groups to the list.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param gn An array of null terminated strings of the names you want to add.
 * @param num The number of groups names you are adding (size of the sn array).
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_addgroups(aim_session_t *sess, aim_conn_t *conn, char **gn, unsigned int num)
{
        struct aim_ssi_item *parentgroup, **newitems;
        guint16 i;

        if (!sess || !conn || !gn || !num) {
                return -EINVAL;
        }

        /* Look up the parent group */
        if (!(parentgroup = aim_ssi_itemlist_find(sess->ssi.items, 0, 0))) {
                aim_ssi_addmastergroup(sess, conn);
                if (!(parentgroup = aim_ssi_itemlist_find(sess->ssi.items, 0, 0))) {
                        return -ENOMEM;
                }
        }

        /* Allocate an array of pointers to each of the new items */
        if (!(newitems = g_new0(struct aim_ssi_item *, num))) {
                return -ENOMEM;
        }

        /* Add items to the local list, and index them in the array */
        for (i = 0; i < num; i++) {
                if (!(newitems[i] = aim_ssi_itemlist_add(&sess->ssi.items, parentgroup, gn[i], AIM_SSI_TYPE_GROUP))) {
                        g_free(newitems);
                        return -ENOMEM;
                }
        }

        /* Send the add item SNAC */
        if ((i = aim_ssi_addmoddel(sess, conn, newitems, num, AIM_CB_SSI_ADD))) {
                g_free(newitems);
                return -i;
        }

        /* Free the array of pointers to each of the new items */
        g_free(newitems);

        /* Rebuild the additional data in the parent group */
        if ((i = aim_ssi_itemlist_rebuildgroup(&sess->ssi.items, parentgroup))) {
                return i;
        }

        /* Send the mod item SNAC */
        if ((i = aim_ssi_addmoddel(sess, conn, &parentgroup, 1, AIM_CB_SSI_MOD))) {
                return i;
        }

        /* Begin sending SSI SNACs */
        if (!(i = aim_ssi_dispatch(sess, conn))) {
                return i;
        }

        return 0;
}

/**
 * Add an array of a certain type of item to the list.  This can be used for
 * permit buddies, deny buddies, ICQ's ignore buddies, and probably other
 * types, also.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param sn An array of null terminated strings of the names you want to add.
 * @param num The number of groups names you are adding (size of the sn array).
 * @param type The type of item you want to add.  See the AIM_SSI_TYPE_BLEH
 *        #defines in aim.h.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_addpord(aim_session_t *sess, aim_conn_t *conn, char **sn, unsigned int num, guint16 type)
{
        struct aim_ssi_item **newitems;
        guint16 i;

        if (!sess || !conn || !sn || !num) {
                return -EINVAL;
        }

        /* Allocate an array of pointers to each of the new items */
        if (!(newitems = g_new0(struct aim_ssi_item *, num))) {
                return -ENOMEM;
        }

        /* Add items to the local list, and index them in the array */
        for (i = 0; i < num; i++) {
                if (!(newitems[i] = aim_ssi_itemlist_add(&sess->ssi.items, NULL, sn[i], type))) {
                        g_free(newitems);
                        return -ENOMEM;
                }
        }

        /* Send the add item SNAC */
        if ((i = aim_ssi_addmoddel(sess, conn, newitems, num, AIM_CB_SSI_ADD))) {
                g_free(newitems);
                return -i;
        }

        /* Free the array of pointers to each of the new items */
        g_free(newitems);

        /* Begin sending SSI SNACs */
        if (!(i = aim_ssi_dispatch(sess, conn))) {
                return i;
        }

        return 0;
}

/**
 * Move a buddy from one group to another group.  This basically just deletes the
 * buddy and re-adds it.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param oldgn The group that the buddy is currently in.
 * @param newgn The group that the buddy should be moved in to.
 * @param sn The name of the buddy to be moved.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_movebuddy(aim_session_t *sess, aim_conn_t *conn, char *oldgn, char *newgn, char *sn)
{
        struct aim_ssi_item **groups, *buddy, *cur;
        guint16 i;

        if (!sess || !conn || !oldgn || !newgn || !sn) {
                return -EINVAL;
        }

        /* Look up the buddy */
        if (!(buddy = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, sn, AIM_SSI_TYPE_BUDDY))) {
                return -ENOMEM;
        }

        /* Allocate an array of pointers to the two groups */
        if (!(groups = g_new0(struct aim_ssi_item *, 2))) {
                return -ENOMEM;
        }

        /* Look up the old parent group */
        if (!(groups[0] = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, oldgn, AIM_SSI_TYPE_GROUP))) {
                g_free(groups);
                return -ENOMEM;
        }

        /* Look up the new parent group */
        if (!(groups[1] = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, newgn, AIM_SSI_TYPE_GROUP))) {
                g_free(groups);
                return -ENOMEM;
        }

        /* Send the delete item SNAC */
        aim_ssi_addmoddel(sess, conn, &buddy, 1, AIM_CB_SSI_DEL);

        /* Put the buddy in the new group */
        buddy->gid = groups[1]->gid;

        /* Assign a new buddy ID#, because the new group might already have a buddy with this ID# */
        buddy->bid = 0;
        do {
                buddy->bid += 0x0001;
                for (cur = sess->ssi.items, i = 0; ((cur) && (!i)); cur = cur->next) {
                        if ((cur->bid == buddy->bid) && (cur->gid == buddy->gid) && (cur->type == AIM_SSI_TYPE_BUDDY) &&
                            (cur->name) && aim_sncmp(cur->name, buddy->name)) {
                                i = 1;
                        }
                }
        } while (i);

        /* Rebuild the additional data in the two parent groups */
        aim_ssi_itemlist_rebuildgroup(&sess->ssi.items, groups[0]);
        aim_ssi_itemlist_rebuildgroup(&sess->ssi.items, groups[1]);

        /* Send the add item SNAC */
        aim_ssi_addmoddel(sess, conn, &buddy, 1, AIM_CB_SSI_ADD);

        /* Send the mod item SNAC */
        aim_ssi_addmoddel(sess, conn, groups, 2, AIM_CB_SSI_MOD);

        /* Free the temporary array */
        g_free(groups);

        /* Begin sending SSI SNACs */
        aim_ssi_dispatch(sess, conn);

        return 0;
}

/**
 * Delete an array of screen names from the given group.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param gn The name of the group from which you want to delete these names.
 * @param sn An array of null terminated strings of the names you want to delete.
 * @param num The number of screen names you are deleting (size of the sn array).
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delbuddies(aim_session_t *sess, aim_conn_t *conn, char *gn, char **sn, unsigned int num)
{
        struct aim_ssi_item *cur, *parentgroup, **delitems;
        int i;

        if (!sess || !conn || !gn || !sn || !num) {
                return -EINVAL;
        }

        /* Look up the parent group */
        if (!(parentgroup = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, gn, AIM_SSI_TYPE_GROUP))) {
                return -EINVAL;
        }

        /* Allocate an array of pointers to each of the items to be deleted */
        delitems = g_new0(struct aim_ssi_item *, num);

        /* Make the delitems array a pointer to the aim_ssi_item structs to be deleted */
        for (i = 0; i < num; i++) {
                if (!(delitems[i] = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, sn[i], AIM_SSI_TYPE_BUDDY))) {
                        g_free(delitems);
                        return -EINVAL;
                }

                /* Remove the delitems from the item list */
                if (sess->ssi.items == delitems[i]) {
                        sess->ssi.items = sess->ssi.items->next;
                } else {
                        for (cur = sess->ssi.items; (cur->next && (cur->next != delitems[i])); cur = cur->next) {
                                ;
                        }
                        if (cur->next) {
                                cur->next = cur->next->next;
                        }
                }
        }

        /* Send the del item SNAC */
        aim_ssi_addmoddel(sess, conn, delitems, num, AIM_CB_SSI_DEL);

        /* Free the items */
        for (i = 0; i < num; i++) {
                if (delitems[i]->name) {
                        g_free(delitems[i]->name);
                }
                if (delitems[i]->data) {
                        aim_freetlvchain((aim_tlvlist_t **) &delitems[i]->data);
                }
                g_free(delitems[i]);
        }
        g_free(delitems);

        /* Rebuild the additional data in the parent group */
        aim_ssi_itemlist_rebuildgroup(&sess->ssi.items, parentgroup);

        /* Send the mod item SNAC */
        aim_ssi_addmoddel(sess, conn, &parentgroup, 1, AIM_CB_SSI_MOD);

        /* Delete the group, but only if it's empty */
        if (!parentgroup->data) {
                aim_ssi_delgroups(sess, conn, &parentgroup->name, 1);
        }

        /* Begin sending SSI SNACs */
        aim_ssi_dispatch(sess, conn);

        return 0;
}

/**
 * Delete the master group from the item list.  There can be only one.
 * Er, so just find the one master group and delete it.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delmastergroup(aim_session_t *sess, aim_conn_t *conn)
{
        struct aim_ssi_item *cur, *delitem;

        if (!sess || !conn) {
                return -EINVAL;
        }

        /* Make delitem a pointer to the aim_ssi_item to be deleted */
        if (!(delitem = aim_ssi_itemlist_find(sess->ssi.items, 0, 0))) {
                return -EINVAL;
        }

        /* Remove delitem from the item list */
        if (sess->ssi.items == delitem) {
                sess->ssi.items = sess->ssi.items->next;
        } else {
                for (cur = sess->ssi.items; (cur->next && (cur->next != delitem)); cur = cur->next) {
                        ;
                }
                if (cur->next) {
                        cur->next = cur->next->next;
                }
        }

        /* Send the del item SNAC */
        aim_ssi_addmoddel(sess, conn, &delitem, 1, AIM_CB_SSI_DEL);

        /* Free the item */
        if (delitem->name) {
                g_free(delitem->name);
        }
        if (delitem->data) {
                aim_freetlvchain((aim_tlvlist_t **) &delitem->data);
        }
        g_free(delitem);

        /* Begin sending SSI SNACs */
        aim_ssi_dispatch(sess, conn);

        return 0;
}

/**
 * Delete an array of groups.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param gn An array of null terminated strings of the groups you want to delete.
 * @param num The number of groups you are deleting (size of the gn array).
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delgroups(aim_session_t *sess, aim_conn_t *conn, char **gn, unsigned int num)
{
        struct aim_ssi_item *cur, *parentgroup, **delitems;
        int i;

        if (!sess || !conn || !gn || !num) {
                return -EINVAL;
        }

        /* Look up the parent group */
        if (!(parentgroup = aim_ssi_itemlist_find(sess->ssi.items, 0, 0))) {
                return -EINVAL;
        }

        /* Allocate an array of pointers to each of the items to be deleted */
        delitems = g_new0(struct aim_ssi_item *, num);

        /* Make the delitems array a pointer to the aim_ssi_item structs to be deleted */
        for (i = 0; i < num; i++) {
                if (!(delitems[i] = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, gn[i], AIM_SSI_TYPE_GROUP))) {
                        g_free(delitems);
                        return -EINVAL;
                }

                /* Remove the delitems from the item list */
                if (sess->ssi.items == delitems[i]) {
                        sess->ssi.items = sess->ssi.items->next;
                } else {
                        for (cur = sess->ssi.items; (cur->next && (cur->next != delitems[i])); cur = cur->next) {
                                ;
                        }
                        if (cur->next) {
                                cur->next = cur->next->next;
                        }
                }
        }

        /* Send the del item SNAC */
        aim_ssi_addmoddel(sess, conn, delitems, num, AIM_CB_SSI_DEL);

        /* Free the items */
        for (i = 0; i < num; i++) {
                if (delitems[i]->name) {
                        g_free(delitems[i]->name);
                }
                if (delitems[i]->data) {
                        aim_freetlvchain((aim_tlvlist_t **) &delitems[i]->data);
                }
                g_free(delitems[i]);
        }
        g_free(delitems);

        /* Rebuild the additional data in the parent group */
        aim_ssi_itemlist_rebuildgroup(&sess->ssi.items, parentgroup);

        /* Send the mod item SNAC */
        aim_ssi_addmoddel(sess, conn, &parentgroup, 1, AIM_CB_SSI_MOD);

        /* Delete the group, but only if it's empty */
        if (!parentgroup->data) {
                aim_ssi_delmastergroup(sess, conn);
        }

        /* Begin sending SSI SNACs */
        aim_ssi_dispatch(sess, conn);

        return 0;
}

/**
 * Delete an array of a certain type of item from the list.  This can be
 * used for permit buddies, deny buddies, ICQ's ignore buddies, and
 * probably other types, also.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param sn An array of null terminated strings of the items you want to delete.
 * @param num The number of items you are deleting (size of the sn array).
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_delpord(aim_session_t *sess, aim_conn_t *conn, char **sn, unsigned int num, guint16 type)
{
        struct aim_ssi_item *cur, **delitems;
        int i;

        if (!sess || !conn || !sn || !num || (type != AIM_SSI_TYPE_PERMIT && type != AIM_SSI_TYPE_DENY)) {
                return -EINVAL;
        }

        /* Allocate an array of pointers to each of the items to be deleted */
        delitems = g_new0(struct aim_ssi_item *, num);

        /* Make the delitems array a pointer to the aim_ssi_item structs to be deleted */
        for (i = 0; i < num; i++) {
                if (!(delitems[i] = aim_ssi_itemlist_finditem(sess->ssi.items, NULL, sn[i], type))) {
                        g_free(delitems);
                        return -EINVAL;
                }

                /* Remove the delitems from the item list */
                if (sess->ssi.items == delitems[i]) {
                        sess->ssi.items = sess->ssi.items->next;
                } else {
                        for (cur = sess->ssi.items; (cur->next && (cur->next != delitems[i])); cur = cur->next) {
                                ;
                        }
                        if (cur->next) {
                                cur->next = cur->next->next;
                        }
                }
        }

        /* Send the del item SNAC */
        aim_ssi_addmoddel(sess, conn, delitems, num, AIM_CB_SSI_DEL);

        /* Free the items */
        for (i = 0; i < num; i++) {
                if (delitems[i]->name) {
                        g_free(delitems[i]->name);
                }
                if (delitems[i]->data) {
                        aim_freetlvchain((aim_tlvlist_t **) &delitems[i]->data);
                }
                g_free(delitems[i]);
        }
        g_free(delitems);

        /* Begin sending SSI SNACs */
        aim_ssi_dispatch(sess, conn);

        return 0;
}

/*
 * Request SSI Rights.
 */
int aim_ssi_reqrights(aim_session_t *sess, aim_conn_t *conn)
{
        return aim_genericreq_n(sess, conn, AIM_CB_FAM_SSI, AIM_CB_SSI_REQRIGHTS);
}

/*
 * SSI Rights Information.
 */
static int parserights(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
                ret = userfunc(sess, rx);
        }

        return ret;
}

int aim_ssi_reqalldata(aim_session_t *sess, aim_conn_t *conn)
{
        aim_frame_t *fr;
        aim_snacid_t snacid;

        if (!sess || !conn) {
                return -EINVAL;
        }

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10))) {
                return -ENOMEM;
        }

        snacid = aim_cachesnac(sess, AIM_CB_FAM_SSI, AIM_CB_SSI_REQFULLLIST, 0x0000, NULL, 0);

        aim_putsnac(&fr->data, AIM_CB_FAM_SSI, AIM_CB_SSI_REQFULLLIST, 0x0000, snacid);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/*
 * SSI Data.
 */
static int parsedata(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        struct aim_ssi_item *cur = NULL;
        guint8 fmtver; /* guess */
        guint16 revision;
        guint32 timestamp;

        /* When you set the version for the SSI family to 2-4, the beginning of this changes.
         * Instead of the version and then the revision, there is "0x0006" and then a type
         * 0x0001 TLV containing the 2 byte SSI family version that you sent earlier.  Also,
         * the SNAC flags go from 0x0000 to 0x8000.  I guess the 0x0006 is the length of the
         * TLV(s) that follow.  The rights SNAC does the same thing, with the differing flag
         * and everything.
         */

        fmtver = aimbs_get8(bs); /* Version of ssi data.  Should be 0x00 */
        revision = aimbs_get16(bs); /* # of times ssi data has been modified */
        if (revision != 0) {
                sess->ssi.revision = revision;
        }

        for (cur = sess->ssi.items; cur && cur->next; cur = cur->next) {
                ;
        }

        while (aim_bstream_empty(bs) > 4) { /* last four bytes are stamp */
                guint16 namelen, tbslen;

                if (!sess->ssi.items) {
                        if (!(sess->ssi.items = g_new0(struct aim_ssi_item, 1))) {
                                return -ENOMEM;
                        }
                        cur = sess->ssi.items;
                } else {
                        if (!(cur->next = g_new0(struct aim_ssi_item, 1))) {
                                return -ENOMEM;
                        }
                        cur = cur->next;
                }

                if ((namelen = aimbs_get16(bs))) {
                        cur->name = aimbs_getstr(bs, namelen);
                }
                cur->gid = aimbs_get16(bs);
                cur->bid = aimbs_get16(bs);
                cur->type = aimbs_get16(bs);

                if ((tbslen = aimbs_get16(bs))) {
                        aim_bstream_t tbs;

                        aim_bstream_init(&tbs, bs->data + bs->offset /* XXX */, tbslen);
                        cur->data = (void *) aim_readtlvchain(&tbs);
                        aim_bstream_advance(bs, tbslen);
                }
        }

        timestamp = aimbs_get32(bs);
        if (timestamp != 0) {
                sess->ssi.timestamp = timestamp;
        }
        sess->ssi.received_data = 1;

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
                ret = userfunc(sess, rx, fmtver, sess->ssi.revision, sess->ssi.timestamp, sess->ssi.items);
        }

        return ret;
}

/*
 * SSI Data Enable Presence.
 *
 * Should be sent after receiving 13/6 or 13/f to tell the server you
 * are ready to begin using the list.  It will promptly give you the
 * presence information for everyone in your list and put your permit/deny
 * settings into effect.
 *
 */
int aim_ssi_enable(aim_session_t *sess, aim_conn_t *conn)
{
        return aim_genericreq_n(sess, conn, AIM_CB_FAM_SSI, 0x0007);
}

/*
 * Stuff for SSI authorizations. The code used to work with the old im_ch4
 * messages, but those are supposed to be obsolete. This is probably
 * ICQ-specific.
 */

/**
 * Request authorization to add someone to the server-side buddy list.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param uin The contact's ICQ UIN.
 * @param reason The reason string to send with the request.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_auth_request(aim_session_t *sess, aim_conn_t *conn, char *uin, char *reason)
{
        aim_frame_t *fr;
        aim_snacid_t snacid;
        int snaclen;

        snaclen = 10 + 1 + strlen(uin) + 2 + strlen(reason) + 2;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, snaclen))) {
                return -ENOMEM;
        }

        snacid = aim_cachesnac(sess, AIM_CB_FAM_SSI, AIM_CB_SSI_SENDAUTHREQ, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, AIM_CB_FAM_SSI, AIM_CB_SSI_SENDAUTHREQ, 0x0000, snacid);

        aimbs_put8(&fr->data, strlen(uin));
        aimbs_putraw(&fr->data, (guint8 *) uin, strlen(uin));
        aimbs_put16(&fr->data, strlen(reason));
        aimbs_putraw(&fr->data, (guint8 *) reason, strlen(reason));
        aimbs_put16(&fr->data, 0);

        aim_tx_enqueue(sess, fr);

        return(0);
}

/**
 * Reply to an authorization request to add someone to the server-side buddy list.
 *
 * @param sess The oscar session.
 * @param conn The bos connection for this session.
 * @param uin The contact's ICQ UIN.
 * @param yesno 1 == Permit, 0 == Deny
 * @param reason The reason string to send with the request.
 * @return Return 0 if no errors, otherwise return the error number.
 */
int aim_ssi_auth_reply(aim_session_t *sess, aim_conn_t *conn, char *uin, int yesno, char *reason)
{
        aim_frame_t *fr;
        aim_snacid_t snacid;
        int snaclen;

        snaclen = 10 + 1 + strlen(uin) + 3 + strlen(reason);

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, snaclen))) {
                return -ENOMEM;
        }

        snacid = aim_cachesnac(sess, AIM_CB_FAM_SSI, AIM_CB_SSI_SENDAUTHREP, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, AIM_CB_FAM_SSI, AIM_CB_SSI_SENDAUTHREP, 0x0000, snacid);

        aimbs_put8(&fr->data, strlen(uin));
        aimbs_putraw(&fr->data, (guint8 *) uin, strlen(uin));
        aimbs_put8(&fr->data, yesno);
        aimbs_put16(&fr->data, strlen(reason));
        aimbs_putraw(&fr->data, (guint8 *) reason, strlen(reason));

        aim_tx_enqueue(sess, fr);

        return(0);
}


/*
 * SSI Add/Mod/Del Item(s).
 *
 * Sends the SNAC to add, modify, or delete an item from the server-stored
 * information.  These 3 SNACs all have an identical structure.  The only
 * difference is the subtype that is set for the SNAC.
 *
 */
int aim_ssi_addmoddel(aim_session_t *sess, aim_conn_t *conn, struct aim_ssi_item **items, unsigned int num,
                      guint16 subtype)
{
        aim_frame_t *fr;
        aim_snacid_t snacid;
        int i, snaclen, listlen;
        char *list = NULL;

        if (!sess || !conn || !items || !num) {
                return -EINVAL;
        }

        snaclen = 10; /* For family, subtype, flags, and SNAC ID */
        listlen = 0;
        for (i = 0; i < num; i++) {
                snaclen += 10; /* For length, GID, BID, type, and length */
                if (items[i]->name) {
                        snaclen += strlen(items[i]->name);

                        if (subtype == AIM_CB_SSI_ADD) {
                                list = g_realloc(list, listlen + strlen(items[i]->name) + 1);
                                strcpy(list + listlen, items[i]->name);
                                listlen += strlen(items[i]->name) + 1;
                        }
                } else {
                        if (subtype == AIM_CB_SSI_ADD) {
                                list = g_realloc(list, listlen + 1);
                                list[listlen] = '\0';
                                listlen++;
                        }
                }
                if (items[i]->data) {
                        snaclen += aim_sizetlvchain((aim_tlvlist_t **) &items[i]->data);
                }
        }

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, snaclen))) {
                return -ENOMEM;
        }

        snacid = aim_cachesnac(sess, AIM_CB_FAM_SSI, subtype, 0x0000, list, list ? listlen : 0);
        aim_putsnac(&fr->data, AIM_CB_FAM_SSI, subtype, 0x0000, snacid);

        g_free(list);

        for (i = 0; i < num; i++) {
                aimbs_put16(&fr->data, items[i]->name ? strlen(items[i]->name) : 0);
                if (items[i]->name) {
                        aimbs_putraw(&fr->data, (guint8 *) items[i]->name, strlen(items[i]->name));
                }
                aimbs_put16(&fr->data, items[i]->gid);
                aimbs_put16(&fr->data, items[i]->bid);
                aimbs_put16(&fr->data, items[i]->type);
                aimbs_put16(&fr->data, items[i]->data ? aim_sizetlvchain((aim_tlvlist_t **) &items[i]->data) : 0);
                if (items[i]->data) {
                        aim_writetlvchain(&fr->data, (aim_tlvlist_t **) &items[i]->data);
                }
        }

        aim_ssi_enqueue(sess, conn, fr);

        return 0;
}

/*
 * SSI Add/Mod/Del Ack.
 *
 * Response to add, modify, or delete SNAC (sent with aim_ssi_addmoddel).
 *
 */
static int parseack(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;
        aim_snac_t *origsnac;

        sess->ssi.waiting_for_ack = 0;
        aim_ssi_dispatch(sess, rx->conn);

        origsnac = aim_remsnac(sess, snac->id);

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
                ret = userfunc(sess, rx, origsnac);
        }

        if (origsnac) {
                g_free(origsnac->data);
                g_free(origsnac);
        }

        return ret;
}

/*
 * SSI Begin Data Modification.
 *
 * Tells the server you're going to start modifying data.
 *
 */
int aim_ssi_modbegin(aim_session_t *sess, aim_conn_t *conn)
{
        return aim_genericreq_n(sess, conn, AIM_CB_FAM_SSI, AIM_CB_SSI_EDITSTART);
}

/*
 * SSI End Data Modification.
 *
 * Tells the server you're done modifying data.
 *
 */
int aim_ssi_modend(aim_session_t *sess, aim_conn_t *conn)
{
        return aim_genericreq_n(sess, conn, AIM_CB_FAM_SSI, AIM_CB_SSI_EDITSTOP);
}

/*
 * SSI Data Unchanged.
 *
 * Response to aim_ssi_reqdata() if the server-side data is not newer than
 * posted local stamp/revision.
 *
 */
static int parsedataunchanged(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac,
                              aim_bstream_t *bs)
{
        int ret = 0;
        aim_rxcallback_t userfunc;

        sess->ssi.received_data = 1;

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
                ret = userfunc(sess, rx);
        }

        return ret;
}

static int snachandler(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{

        if (snac->subtype == AIM_CB_SSI_RIGHTSINFO) {
                return parserights(sess, mod, rx, snac, bs);
        } else if (snac->subtype == AIM_CB_SSI_LIST) {
                return parsedata(sess, mod, rx, snac, bs);
        } else if (snac->subtype == AIM_CB_SSI_SRVACK) {
                return parseack(sess, mod, rx, snac, bs);
        } else if (snac->subtype == AIM_CB_SSI_NOLIST) {
                return parsedataunchanged(sess, mod, rx, snac, bs);
        }

        return 0;
}

static void ssi_shutdown(aim_session_t *sess, aim_module_t *mod)
{
        aim_ssi_freelist(sess);

        return;
}

int ssi_modfirst(aim_session_t *sess, aim_module_t *mod)
{

        mod->family = AIM_CB_FAM_SSI;
        mod->version = 0x0003;
        mod->toolid = 0x0110;
        mod->toolversion = 0x0629;
        mod->flags = 0;
        strncpy(mod->name, "ssi", sizeof(mod->name));
        mod->snachandler = snachandler;
        mod->shutdown = ssi_shutdown;

        return 0;
}