source: libfaim/chat.c @ dff8d8a

/*
 * aim_chat.c
 *
 * Routines for the Chat service.
 *
 */

#define FAIM_INTERNAL
#include <aim.h> 

/* Stored in the ->priv of chat connections */
struct chatconnpriv {
        fu16_t exchange;
        char *name;
        fu16_t instance;
};

static void dumpbox(aim_session_t *sess, unsigned char *buf, int len)
{
        int i;

        if (!sess || !buf || !len)
                return;

        faimdprintf(sess, 1, "\nDump of %d bytes at %p:", len, buf);

        for (i = 0; i < len; i++) {
                if ((i % 8) == 0)
                        faimdprintf(sess, 1, "\n\t");

                faimdprintf(sess, 1, "0x%2x ", buf[i]);
        }

        faimdprintf(sess, 1, "\n\n");

        return;
}

faim_internal void aim_conn_kill_chat(aim_session_t *sess, aim_conn_t *conn)
{
        struct chatconnpriv *ccp = (struct chatconnpriv *)conn->priv;

        if (ccp)
                free(ccp->name);
        free(ccp);

        return;
}

faim_export char *aim_chat_getname(aim_conn_t *conn)
{
        struct chatconnpriv *ccp;

        if (!conn)
                return NULL;

        if (conn->type != AIM_CONN_TYPE_CHAT)
                return NULL;

        ccp = (struct chatconnpriv *)conn->priv;

        return ccp->name;
}

/* XXX get this into conn.c -- evil!! */
faim_export aim_conn_t *aim_chat_getconn(aim_session_t *sess, const char *name)
{
        aim_conn_t *cur;

        for (cur = sess->connlist; cur; cur = cur->next) {
                struct chatconnpriv *ccp = (struct chatconnpriv *)cur->priv;

                if (cur->type != AIM_CONN_TYPE_CHAT)
                        continue;
                if (!cur->priv) {
                        faimdprintf(sess, 0, "faim: chat: chat connection with no name! (fd = %d)\n", cur->fd);
                        continue;
                }

                if (strcmp(ccp->name, name) == 0)
                        break;
        }

        return cur;
}

faim_export int aim_chat_attachname(aim_conn_t *conn, fu16_t exchange, const char *roomname, fu16_t instance)
{
        struct chatconnpriv *ccp;

        if (!conn || !roomname)
                return -EINVAL;

        if (conn->priv)
                free(conn->priv);

        if (!(ccp = malloc(sizeof(struct chatconnpriv))))
                return -ENOMEM;

        ccp->exchange = exchange;
        ccp->name = strdup(roomname);
        ccp->instance = instance;

        conn->priv = (void *)ccp;

        return 0;
}

/*
 * Send a Chat Message.
 *
 * Possible flags:
 *   AIM_CHATFLAGS_NOREFLECT   --  Unset the flag that requests messages
 *                                 should be sent to their sender.
 *   AIM_CHATFLAGS_AWAY        --  Mark the message as an autoresponse
 *                                 (Note that WinAIM does not honor this,
 *                                 and displays the message as normal.)
 *
 * XXX convert this to use tlvchains 
 */
faim_export int aim_chat_send_im(aim_session_t *sess, aim_conn_t *conn, fu16_t flags, const char *msg, int msglen)
{   
        int i;
        aim_frame_t *fr;
        aim_msgcookie_t *cookie;
        aim_snacid_t snacid;
        fu8_t ckstr[8];
        aim_tlvlist_t *otl = NULL, *itl = NULL;

        if (!sess || !conn || !msg || (msglen <= 0))
                return 0;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 1152)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x000e, 0x0005, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x000e, 0x0005, 0x0000, snacid);


        /* 
         * Generate a random message cookie.
         *
         * XXX mkcookie should generate the cookie and cache it in one
         * operation to preserve uniqueness.
         *
         */
        for (i = 0; i < sizeof(ckstr); i++)
                aimutil_put8(ckstr+i, (fu8_t) rand());

        cookie = aim_mkcookie(ckstr, AIM_COOKIETYPE_CHAT, NULL);
        cookie->data = NULL; /* XXX store something useful here */

        aim_cachecookie(sess, cookie);

        for (i = 0; i < sizeof(ckstr); i++)
                aimbs_put8(&fr->data, ckstr[i]);


        /*
         * Channel ID. 
         */
        aimbs_put16(&fr->data, 0x0003);


        /*
         * Type 1: Flag meaning this message is destined to the room.
         */
        aim_addtlvtochain_noval(&otl, 0x0001);

        /*
         * Type 6: Reflect
         */
        if (!(flags & AIM_CHATFLAGS_NOREFLECT))
                aim_addtlvtochain_noval(&otl, 0x0006);

        /*
         * Type 7: Autoresponse
         */
        if (flags & AIM_CHATFLAGS_AWAY)
                aim_addtlvtochain_noval(&otl, 0x0007);

        /*
         * SubTLV: Type 1: Message
         */
        aim_addtlvtochain_raw(&itl, 0x0001, strlen(msg), msg);

        /*
         * Type 5: Message block.  Contains more TLVs.
         *
         * This could include other information... We just
         * put in a message TLV however.  
         * 
         */
        aim_addtlvtochain_frozentlvlist(&otl, 0x0005, &itl);

        aim_writetlvchain(&fr->data, &otl);
        
        aim_freetlvchain(&itl);
        aim_freetlvchain(&otl);
        
        aim_tx_enqueue(sess, fr);

        return 0;
}

static int aim_addtlvtochain_chatroom(aim_tlvlist_t **list, fu16_t type, fu16_t exchange, const char *roomname, fu16_t instance)
{
        fu8_t *buf;
        int buflen;
        aim_bstream_t bs;

        buflen = 2 + 1 + strlen(roomname) + 2;
        
        if (!(buf = malloc(buflen)))
                return 0;

        aim_bstream_init(&bs, buf, buflen);

        aimbs_put16(&bs, exchange);
        aimbs_put8(&bs, strlen(roomname));
        aimbs_putraw(&bs, roomname, strlen(roomname));
        aimbs_put16(&bs, instance);

        aim_addtlvtochain_raw(list, type, aim_bstream_curpos(&bs), buf);

        free(buf);

        return 0;
}

/*
 * Join a room of name roomname.  This is the first step to joining an 
 * already created room.  It's basically a Service Request for 
 * family 0x000e, with a little added on to specify the exchange and room 
 * name.
 */
faim_export int aim_chat_join(aim_session_t *sess, aim_conn_t *conn, fu16_t exchange, const char *roomname, fu16_t instance)
{
        aim_frame_t *fr;
        aim_snacid_t snacid;
        aim_tlvlist_t *tl = NULL;
        struct chatsnacinfo csi;
        
        if (!sess || !conn || !roomname || !strlen(roomname))
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 512)))
                return -ENOMEM;

        memset(&csi, 0, sizeof(csi));
        csi.exchange = exchange;
        strncpy(csi.name, roomname, sizeof(csi.name));
        csi.instance = instance;

        snacid = aim_cachesnac(sess, 0x0001, 0x0004, 0x0000, &csi, sizeof(csi));
        aim_putsnac(&fr->data, 0x0001, 0x0004, 0x0000, snacid);

        /*
         * Requesting service chat (0x000e)
         */
        aimbs_put16(&fr->data, 0x000e);

        aim_addtlvtochain_chatroom(&tl, 0x0001, exchange, roomname, instance);
        aim_writetlvchain(&fr->data, &tl);
        aim_freetlvchain(&tl);

        aim_tx_enqueue(sess, fr);

        return 0; 
}

faim_internal int aim_chat_readroominfo(aim_bstream_t *bs, struct aim_chat_roominfo *outinfo)
{
        int namelen;

        if (!bs || !outinfo)
                return 0;

        outinfo->exchange = aimbs_get16(bs);
        namelen = aimbs_get8(bs);
        outinfo->name = aimbs_getstr(bs, namelen);
        outinfo->instance = aimbs_get16(bs);

        return 0;
}

faim_export int aim_chat_leaveroom(aim_session_t *sess, const char *name)
{
        aim_conn_t *conn;

        if (!(conn = aim_chat_getconn(sess, name)))
                return -ENOENT;

        aim_conn_close(conn);

        return 0;
}

/*
 * conn must be a BOS connection!
 */
faim_export int aim_chat_invite(aim_session_t *sess, aim_conn_t *conn, const char *sn, const char *msg, fu16_t exchange, const char *roomname, fu16_t instance)
{
        int i;
        aim_frame_t *fr;
        aim_msgcookie_t *cookie;
        struct aim_invite_priv *priv;
        fu8_t ckstr[8];
        aim_snacid_t snacid;
        aim_tlvlist_t *otl = NULL, *itl = NULL;
        fu8_t *hdr;
        int hdrlen;
        aim_bstream_t hdrbs;
        
        if (!sess || !conn || !sn || !msg || !roomname)
                return -EINVAL;

        if (conn->type != AIM_CONN_TYPE_BOS)
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 1152+strlen(sn)+strlen(roomname)+strlen(msg))))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, sn, strlen(sn)+1);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);


        /*
         * Cookie
         */
        for (i = 0; i < sizeof(ckstr); i++)
                aimutil_put8(ckstr, (fu8_t) rand());

        /* XXX should be uncached by an unwritten 'invite accept' handler */
        if ((priv = malloc(sizeof(struct aim_invite_priv)))) {
                priv->sn = strdup(sn);
                priv->roomname = strdup(roomname);
                priv->exchange = exchange;
                priv->instance = instance;
        }

        if ((cookie = aim_mkcookie(ckstr, AIM_COOKIETYPE_INVITE, priv)))
                aim_cachecookie(sess, cookie);
        else
                free(priv);

        for (i = 0; i < sizeof(ckstr); i++)
                aimbs_put8(&fr->data, ckstr[i]);


        /*
         * Channel (2)
         */
        aimbs_put16(&fr->data, 0x0002);

        /*
         * Dest sn
         */
        aimbs_put8(&fr->data, strlen(sn));
        aimbs_putraw(&fr->data, sn, strlen(sn));

        /*
         * TLV t(0005)
         *
         * Everything else is inside this TLV.
         *
         * Sigh.  AOL was rather inconsistent right here.  So we have
         * to play some minor tricks.  Right inside the type 5 is some
         * raw data, followed by a series of TLVs.  
         *
         */
        hdrlen = 2+8+16+6+4+4+strlen(msg)+4+2+1+strlen(roomname)+2;
        hdr = malloc(hdrlen);
        aim_bstream_init(&hdrbs, hdr, hdrlen);
        
        aimbs_put16(&hdrbs, 0x0000); /* Unknown! */
        aimbs_putraw(&hdrbs, ckstr, sizeof(ckstr)); /* I think... */
        aim_putcap(&hdrbs, AIM_CAPS_CHAT);

        aim_addtlvtochain16(&itl, 0x000a, 0x0001);
        aim_addtlvtochain_noval(&itl, 0x000f);
        aim_addtlvtochain_raw(&itl, 0x000c, strlen(msg), msg);
        aim_addtlvtochain_chatroom(&itl, 0x2711, exchange, roomname, instance);
        aim_writetlvchain(&hdrbs, &itl);
        
        aim_addtlvtochain_raw(&otl, 0x0005, aim_bstream_curpos(&hdrbs), hdr);

        aim_writetlvchain(&fr->data, &otl);

        free(hdr);
        aim_freetlvchain(&itl);
        aim_freetlvchain(&otl);
        
        aim_tx_enqueue(sess, fr);

        return 0;
}

/*
 * General room information.  Lots of stuff.
 *
 * Values I know are in here but I havent attached
 * them to any of the 'Unknown's:
 *      - Language (English)
 *
 * SNAC 000e/0002
 */
static int infoupdate(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        aim_userinfo_t *userinfo = NULL;
        aim_rxcallback_t userfunc;
        int ret = 0;
        int usercount = 0;
        fu8_t detaillevel = 0;
        char *roomname = NULL;
        struct aim_chat_roominfo roominfo;
        fu16_t tlvcount = 0;
        aim_tlvlist_t *tlvlist;
        char *roomdesc = NULL;
        fu16_t flags = 0;
        fu32_t creationtime = 0;
        fu16_t maxmsglen = 0, maxvisiblemsglen = 0;
        fu16_t unknown_d2 = 0, unknown_d5 = 0;

        dumpbox(sess, bs->data + bs->offset, aim_bstream_empty(bs));

        aim_chat_readroominfo(bs, &roominfo);

        detaillevel = aimbs_get8(bs);

        if (detaillevel != 0x02) {
                faimdprintf(sess, 0, "faim: chat_roomupdateinfo: detail level %d not supported\n", detaillevel);
                return 1;
        }

        tlvcount = aimbs_get16(bs);

        /*
         * Everything else are TLVs.
         */ 
        tlvlist = aim_readtlvchain(bs);

        /*
         * TLV type 0x006a is the room name in Human Readable Form.
         */
        if (aim_gettlv(tlvlist, 0x006a, 1))
                roomname = aim_gettlv_str(tlvlist, 0x006a, 1);

        /*
         * Type 0x006f: Number of occupants.
         */
        if (aim_gettlv(tlvlist, 0x006f, 1))
                usercount = aim_gettlv16(tlvlist, 0x006f, 1);

        /*
         * Type 0x0073:  Occupant list.
         */
        if (aim_gettlv(tlvlist, 0x0073, 1)) {   
                int curoccupant = 0;
                aim_tlv_t *tmptlv;
                aim_bstream_t occbs;

                tmptlv = aim_gettlv(tlvlist, 0x0073, 1);

                /* Allocate enough userinfo structs for all occupants */
                userinfo = calloc(usercount, sizeof(aim_userinfo_t));

                aim_bstream_init(&occbs, tmptlv->value, tmptlv->length);

                while (curoccupant < usercount)
                        aim_extractuserinfo(sess, &occbs, &userinfo[curoccupant++]);
        }

        /* 
         * Type 0x00c9: Flags. (AIM_CHATROOM_FLAG)
         */
        if (aim_gettlv(tlvlist, 0x00c9, 1))
                flags = aim_gettlv16(tlvlist, 0x00c9, 1);

        /* 
         * Type 0x00ca: Creation time (4 bytes)
         */
        if (aim_gettlv(tlvlist, 0x00ca, 1))
                creationtime = aim_gettlv32(tlvlist, 0x00ca, 1);

        /* 
         * Type 0x00d1: Maximum Message Length
         */
        if (aim_gettlv(tlvlist, 0x00d1, 1))
                maxmsglen = aim_gettlv16(tlvlist, 0x00d1, 1);

        /* 
         * Type 0x00d2: Unknown. (2 bytes)
         */
        if (aim_gettlv(tlvlist, 0x00d2, 1))
                unknown_d2 = aim_gettlv16(tlvlist, 0x00d2, 1);

        /* 
         * Type 0x00d3: Room Description
         */
        if (aim_gettlv(tlvlist, 0x00d3, 1))
                roomdesc = aim_gettlv_str(tlvlist, 0x00d3, 1);

        /*
         * Type 0x000d4: Unknown (flag only)
         */
        if (aim_gettlv(tlvlist, 0x000d4, 1))
                ;

        /* 
         * Type 0x00d5: Unknown. (1 byte)
         */
        if (aim_gettlv(tlvlist, 0x00d5, 1))
                unknown_d5 = aim_gettlv8(tlvlist, 0x00d5, 1);


        /*
         * Type 0x00d6: Encoding 1 ("us-ascii")
         */
        if (aim_gettlv(tlvlist, 0x000d6, 1))
                ;
        
        /*
         * Type 0x00d7: Language 1 ("en")
         */
        if (aim_gettlv(tlvlist, 0x000d7, 1))
                ;

        /*
         * Type 0x00d8: Encoding 2 ("us-ascii")
         */
        if (aim_gettlv(tlvlist, 0x000d8, 1))
                ;
        
        /*
         * Type 0x00d9: Language 2 ("en")
         */
        if (aim_gettlv(tlvlist, 0x000d9, 1))
                ;

        /*
         * Type 0x00da: Maximum visible message length
         */
        if (aim_gettlv(tlvlist, 0x000da, 1))
                maxvisiblemsglen = aim_gettlv16(tlvlist, 0x00da, 1);

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
                ret = userfunc(sess,
                                rx, 
                                &roominfo,
                                roomname,
                                usercount,
                                userinfo,       
                                roomdesc,
                                flags,
                                creationtime,
                                maxmsglen,
                                unknown_d2,
                                unknown_d5,
                                maxvisiblemsglen);
        }

        free(roominfo.name);
        free(userinfo);
        free(roomname);
        free(roomdesc);
        aim_freetlvchain(&tlvlist);

        return ret;
}

static int userlistchange(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        aim_userinfo_t *userinfo = NULL;
        aim_rxcallback_t userfunc;
        int curcount = 0, ret = 0;

        while (aim_bstream_empty(bs)) {
                curcount++;
                userinfo = realloc(userinfo, curcount * sizeof(aim_userinfo_t));
                aim_extractuserinfo(sess, bs, &userinfo[curcount-1]);
        }

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

        free(userinfo);

        return ret;
}

/*
 * We could probably include this in the normal ICBM parsing 
 * code as channel 0x0003, however, since only the start
 * would be the same, we might as well do it here.
 *
 * General outline of this SNAC:
 *   snac
 *   cookie
 *   channel id
 *   tlvlist
 *     unknown
 *     source user info
 *       name
 *       evility
 *       userinfo tlvs
 *         online time
 *         etc
 *     message metatlv
 *       message tlv
 *         message string
 *       possibly others
 *  
 */
static int incomingmsg(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        aim_userinfo_t userinfo;
        aim_rxcallback_t userfunc;      
        int ret = 0;
        fu8_t *cookie;
        fu16_t channel;
        aim_tlvlist_t *otl;
        char *msg = NULL;
        aim_msgcookie_t *ck;

        memset(&userinfo, 0, sizeof(aim_userinfo_t));

        /*
         * ICBM Cookie.  Uncache it.
         */
        cookie = aimbs_getraw(bs, 8);

        if ((ck = aim_uncachecookie(sess, cookie, AIM_COOKIETYPE_CHAT))) {
                free(ck->data);
                free(ck);
        }

        /*
         * Channel ID
         *
         * Channels 1 and 2 are implemented in the normal ICBM
         * parser.
         *
         * We only do channel 3 here.
         *
         */
        channel = aimbs_get16(bs);

        if (channel != 0x0003) {
                faimdprintf(sess, 0, "faim: chat_incoming: unknown channel! (0x%04x)\n", channel);
                return 0;
        }

        /*
         * Start parsing TLVs right away. 
         */
        otl = aim_readtlvchain(bs);

        /*
         * Type 0x0003: Source User Information
         */
        if (aim_gettlv(otl, 0x0003, 1)) {
                aim_tlv_t *userinfotlv;
                aim_bstream_t tbs;

                userinfotlv = aim_gettlv(otl, 0x0003, 1);

                aim_bstream_init(&tbs, userinfotlv->value, userinfotlv->length);
                aim_extractuserinfo(sess, &tbs, &userinfo);
        }

        /*
         * Type 0x0001: If present, it means it was a message to the 
         * room (as opposed to a whisper).
         */
        if (aim_gettlv(otl, 0x0001, 1))
                ;

        /*
         * Type 0x0005: Message Block.  Conains more TLVs.
         */
        if (aim_gettlv(otl, 0x0005, 1)) {
                aim_tlvlist_t *itl;
                aim_tlv_t *msgblock;
                aim_bstream_t tbs;

                msgblock = aim_gettlv(otl, 0x0005, 1);
                aim_bstream_init(&tbs, msgblock->value, msgblock->length);
                itl = aim_readtlvchain(&tbs);

                /* 
                 * Type 0x0001: Message.
                 */     
                if (aim_gettlv(itl, 0x0001, 1))
                        msg = aim_gettlv_str(itl, 0x0001, 1);

                aim_freetlvchain(&itl); 
        }

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype)))
                ret = userfunc(sess, rx, &userinfo, msg);

        free(cookie);
        free(msg);
        aim_freetlvchain(&otl);

        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 == 0x0002)
                return infoupdate(sess, mod, rx, snac, bs);
        else if ((snac->subtype == 0x0003) || (snac->subtype == 0x0004))
                return userlistchange(sess, mod, rx, snac, bs);
        else if (snac->subtype == 0x0006)
                return incomingmsg(sess, mod, rx, snac, bs);

        return 0;
}

faim_internal int chat_modfirst(aim_session_t *sess, aim_module_t *mod)
{

        mod->family = 0x000e;
        mod->version = 0x0001;
        mod->toolid = 0x0004; /* XXX this doesn't look right */
        mod->toolversion = 0x0001; /* nor does this */
        mod->flags = 0;
        strncpy(mod->name, "chat", sizeof(mod->name));
        mod->snachandler = snachandler;

        return 0;
}