source: libfaim/im.c @ 11a7c6a

/*
 * Family 0x0004 - Routines for sending/receiving Instant Messages.
 *
 * Note the term ICBM (Inter-Client Basic Message) which blankets
 * all types of genericly routed through-server messages.  Within
 * the ICBM types (family 4), a channel is defined.  Each channel
 * represents a different type of message.  Channel 1 is used for
 * what would commonly be called an "instant message".  Channel 2
 * is used for negotiating "rendezvous".  These transactions end in
 * something more complex happening, such as a chat invitation, or
 * a file transfer.  Channel 3 is used for chat messages (not in 
 * the same family as these channels).  Channel 4 is used for 
 * various ICQ messages.  Examples are normal messages, URLs, and 
 * old-style authorization.
 *
 * In addition to the channel, every ICBM contains a cookie.  For
 * standard IMs, these are only used for error messages.  However,
 * the more complex rendezvous messages make suitably more complex
 * use of this field.
 *
 * TODO: Split this up into an im.c file an an icbm.c file.  It 
 *       will be beautiful, you'll see.
 *
 *       Need to rename all the mpmsg messages to aim_im_bleh.
 *
 *       Make sure aim_conn_findbygroup is used by all functions.
 */

#define FAIM_INTERNAL
#include <aim.h>

#ifdef _WIN32
#include "win32dep.h"
#endif

/**
 * Add a standard ICBM header to the given bstream with the given 
 * information.
 *
 * @param bs The bstream to write the ICBM header to.
 * @param c c is for cookie, and cookie is for me.
 * @param ch The ICBM channel (1 through 4).
 * @param sn Null-terminated scrizeen nizame.
 * @return The number of bytes written.  It's really not useful.
 */
static int aim_im_puticbm(aim_bstream_t *bs, const fu8_t *c, fu16_t ch, const char *sn)
{
        aimbs_putraw(bs, c, 8);
        aimbs_put16(bs, ch);
        aimbs_put8(bs, strlen(sn));
        aimbs_putraw(bs, sn, strlen(sn));
        return 8+2+1+strlen(sn);
}

/*
 * Takes a msghdr (and a length) and returns a client type
 * code.  Note that this is *only a guess* and has a low likelihood
 * of actually being accurate.
 *
 * Its based on experimental data, with the help of Eric Warmenhoven
 * who seems to have collected a wide variety of different AIM clients.
 *
 *
 * Heres the current collection:
 *  0501 0003 0101 0101 01              AOL Mobile Communicator, WinAIM 1.0.414
 *  0501 0003 0101 0201 01              WinAIM 2.0.847, 2.1.1187, 3.0.1464, 
 *                                      4.3.2229, 4.4.2286
 *  0501 0004 0101 0102 0101            WinAIM 4.1.2010, libfaim (right here)
 *  0501 0003 0101 02                   WinAIM 5
 *  0501 0001 01                        iChat x.x, mobile buddies
 *  0501 0001 0101 01                   AOL v6.0, CompuServe 2000 v6.0, any TOC client
 *  0501 0002 0106                      WinICQ 5.45.1.3777.85
 *
 * Note that in this function, only the feature bytes are tested, since
 * the rest will always be the same.
 *
 */
faim_export fu16_t aim_im_fingerprint(const fu8_t *msghdr, int len)
{
        static const struct {
                fu16_t clientid;
                int len;
                fu8_t data[10];
        } fingerprints[] = {
                /* AOL Mobile Communicator, WinAIM 1.0.414 */
                { AIM_CLIENTTYPE_MC, 
                  3, {0x01, 0x01, 0x01}},

                /* WinAIM 2.0.847, 2.1.1187, 3.0.1464, 4.3.2229, 4.4.2286 */
                { AIM_CLIENTTYPE_WINAIM, 
                  3, {0x01, 0x01, 0x02}},

                /* WinAIM 4.1.2010, libfaim */
                { AIM_CLIENTTYPE_WINAIM41,
                  4, {0x01, 0x01, 0x01, 0x02}},

                /* AOL v6.0, CompuServe 2000 v6.0, any TOC client */
                { AIM_CLIENTTYPE_AOL_TOC,
                  1, {0x01}},

                { 0, 0}
        };
        int i;

        if (!msghdr || (len <= 0))
                return AIM_CLIENTTYPE_UNKNOWN;

        for (i = 0; fingerprints[i].len; i++) {
                if (fingerprints[i].len != len)
                        continue;
                if (memcmp(fingerprints[i].data, msghdr, fingerprints[i].len) == 0)
                        return fingerprints[i].clientid;
        }

        return AIM_CLIENTTYPE_UNKNOWN;
}

/** 
 * Subtype 0x0002 - Set ICBM parameters.
 *
 * I definitly recommend sending this.  If you don't, you'll be stuck
 * with the rather unreasonable defaults.
 * 
 */
faim_export int aim_im_setparams(aim_session_t *sess, struct aim_icbmparameters *params)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)))
                return -EINVAL;

        if (!params)
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10+16)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0002, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0002, 0x0000, snacid);

        /* This is read-only (see Parameter Reply). Must be set to zero here. */
        aimbs_put16(&fr->data, 0x0000);

        /* These are all read-write */
        aimbs_put32(&fr->data, params->flags); 
        aimbs_put16(&fr->data, params->maxmsglen);
        aimbs_put16(&fr->data, params->maxsenderwarn); 
        aimbs_put16(&fr->data, params->maxrecverwarn); 
        aimbs_put32(&fr->data, params->minmsginterval);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/**
 * Subtype 0x0004 - Request ICBM parameter information.
 *
 */
faim_export int aim_im_reqparams(aim_session_t *sess)
{
        aim_conn_t *conn;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)))
                return -EINVAL;

        return aim_genericreq_n(sess, conn, 0x0004, 0x0004);
}

/**
 * Subtype 0x0005 - Receive parameter information.
 *
 */
static int aim_im_paraminfo(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        aim_rxcallback_t userfunc;
        struct aim_icbmparameters params;

        params.maxchan = aimbs_get16(bs);
        params.flags = aimbs_get32(bs);
        params.maxmsglen = aimbs_get16(bs);
        params.maxsenderwarn = aimbs_get16(bs);
        params.maxrecverwarn = aimbs_get16(bs);
        params.minmsginterval = aimbs_get32(bs);
        
        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype)))
                return userfunc(sess, rx, &params);

        return 0;
}

/**
 * Subtype 0x0006 - Send an ICBM (instant message).  
 *
 *
 * Possible flags:
 *   AIM_IMFLAGS_AWAY  -- Marks the message as an autoresponse
 *   AIM_IMFLAGS_ACK   -- Requests that the server send an ack
 *                        when the message is received (of type 0x0004/0x000c)
 *   AIM_IMFLAGS_OFFLINE--If destination is offline, store it until they are
 *                        online (probably ICQ only).
 *   AIM_IMFLAGS_UNICODE--Instead of ASCII7, the passed message is
 *                        made up of UNICODE duples.  If you set
 *                        this, you'd better be damn sure you know
 *                        what you're doing.
 *   AIM_IMFLAGS_ISO_8859_1 -- The message contains the ASCII8 subset
 *                        known as ISO-8859-1.  
 *
 * Generally, you should use the lowest encoding possible to send
 * your message.  If you only use basic punctuation and the generic
 * Latin alphabet, use ASCII7 (no flags).  If you happen to use non-ASCII7
 * characters, but they are all clearly defined in ISO-8859-1, then 
 * use that.  Keep in mind that not all characters in the PC ASCII8
 * character set are defined in the ISO standard. For those cases (most
 * notably when the (r) symbol is used), you must use the full UNICODE
 * encoding for your message.  In UNICODE mode, _all_ characters must
 * occupy 16bits, including ones that are not special.  (Remember that
 * the first 128 UNICODE symbols are equivelent to ASCII7, however they
 * must be prefixed with a zero high order byte.)
 *
 * I strongly discourage the use of UNICODE mode, mainly because none
 * of the clients I use can parse those messages (and besides that,
 * wchars are difficult and non-portable to handle in most UNIX environments).
 * If you really need to include special characters, use the HTML UNICODE 
 * entities.  These are of the form &#2026; where 2026 is the hex 
 * representation of the UNICODE index (in this case, UNICODE 
 * "Horizontal Ellipsis", or 133 in in ASCII8).
 *
 * Implementation note:  Since this is one of the most-used functions
 * in all of libfaim, it is written with performance in mind.  As such,
 * it is not as clear as it could be in respect to how this message is
 * supposed to be layed out. Most obviously, tlvlists should be used 
 * instead of writing out the bytes manually. 
 *
 * XXX - more precise verification that we never send SNACs larger than 8192
 * XXX - check SNAC size for multipart
 *
 */
faim_export int aim_im_sendch1_ext(aim_session_t *sess, struct aim_sendimext_args *args)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;
        fu8_t ck[8];
        int i, msgtlvlen;
        static const fu8_t deffeatures[] = { 0x01, 0x01, 0x01, 0x02 };

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)))
                return -EINVAL;

        if (!args)
                return -EINVAL;

        if (args->flags & AIM_IMFLAGS_MULTIPART) {
                if (args->mpmsg->numparts <= 0)
                        return -EINVAL;
        } else {
                if (!args->msg || (args->msglen <= 0))
                        return -EINVAL;

                if (args->msglen >= MAXMSGLEN)
                        return -E2BIG;
        }

        /* Painfully calculate the size of the message TLV */
        msgtlvlen = 1 + 1; /* 0501 */

        if (args->flags & AIM_IMFLAGS_CUSTOMFEATURES)
                msgtlvlen += 2 + args->featureslen;
        else
                msgtlvlen += 2 + sizeof(deffeatures);

        if (args->flags & AIM_IMFLAGS_MULTIPART) {
                aim_mpmsg_section_t *sec;

                for (sec = args->mpmsg->parts; sec; sec = sec->next) {
                        msgtlvlen += 2 /* 0101 */ + 2 /* block len */;
                        msgtlvlen += 4 /* charset */ + sec->datalen;
                }

        } else {
                msgtlvlen += 2 /* 0101 */ + 2 /* block len */;
                msgtlvlen += 4 /* charset */ + args->msglen;
        }

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, msgtlvlen+128)))
                return -ENOMEM;

        /* XXX - should be optional */  
        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, args->destsn, strlen(args->destsn)+1);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* 
         * Generate a random message cookie
         *
         * We could cache these like we do SNAC IDs.  (In fact, it 
         * might be a good idea.)  In the message error functions, 
         * the 8byte message cookie is returned as well as the 
         * SNAC ID.
         *
         */
        for (i = 0; i < 8; i++)
                ck[i] = (fu8_t)rand();

        /* ICBM header */
        aim_im_puticbm(&fr->data, ck, 0x0001, args->destsn);

        /* Message TLV (type 0x0002) */
        aimbs_put16(&fr->data, 0x0002);
        aimbs_put16(&fr->data, msgtlvlen);

        /* Features TLV (type 0x0501) */
        aimbs_put16(&fr->data, 0x0501);
        if (args->flags & AIM_IMFLAGS_CUSTOMFEATURES) {
                aimbs_put16(&fr->data, args->featureslen);
                aimbs_putraw(&fr->data, args->features, args->featureslen);
        } else {
                aimbs_put16(&fr->data, sizeof(deffeatures));
                aimbs_putraw(&fr->data, deffeatures, sizeof(deffeatures));
        }

        if (args->flags & AIM_IMFLAGS_MULTIPART) {
                aim_mpmsg_section_t *sec;

                /* Insert each message part in a TLV (type 0x0101) */
                for (sec = args->mpmsg->parts; sec; sec = sec->next) {
                        aimbs_put16(&fr->data, 0x0101);
                        aimbs_put16(&fr->data, sec->datalen + 4);
                        aimbs_put16(&fr->data, sec->charset);
                        aimbs_put16(&fr->data, sec->charsubset);
                        aimbs_putraw(&fr->data, sec->data, sec->datalen);
                }

        } else {

                /* Insert message text in a TLV (type 0x0101) */
                aimbs_put16(&fr->data, 0x0101);

                /* Message block length */
                aimbs_put16(&fr->data, args->msglen + 0x04);

                /* Character set */
                aimbs_put16(&fr->data, args->charset);
                aimbs_put16(&fr->data, args->charsubset);

                /* Message.  Not terminated */
                aimbs_putraw(&fr->data, args->msg, args->msglen);
        }

        /* Set the Autoresponse flag */
        if (args->flags & AIM_IMFLAGS_AWAY) {
                aimbs_put16(&fr->data, 0x0004);
                aimbs_put16(&fr->data, 0x0000);
        } else if (args->flags & AIM_IMFLAGS_ACK) {
                /* Set the Request Acknowledge flag */
                aimbs_put16(&fr->data, 0x0003);
                aimbs_put16(&fr->data, 0x0000);
        }

        if (args->flags & AIM_IMFLAGS_OFFLINE) {
                aimbs_put16(&fr->data, 0x0006);
                aimbs_put16(&fr->data, 0x0000);
        }

        /*
         * Set the I HAVE A REALLY PURTY ICON flag.
         * XXX - This should really only be sent on initial 
         * IMs and when you change your icon.
         */
        if (args->flags & AIM_IMFLAGS_HASICON) {
                aimbs_put16(&fr->data, 0x0008);
                aimbs_put16(&fr->data, 0x000c);
                aimbs_put32(&fr->data, args->iconlen);
                aimbs_put16(&fr->data, 0x0001);
                aimbs_put16(&fr->data, args->iconsum);
                aimbs_put32(&fr->data, args->iconstamp);
        }

        /*
         * Set the Buddy Icon Requested flag.
         * XXX - Everytime?  Surely not...
         */
        if (args->flags & AIM_IMFLAGS_BUDDYREQ) {
                aimbs_put16(&fr->data, 0x0009);
                aimbs_put16(&fr->data, 0x0000);
        }

        aim_tx_enqueue(sess, fr);

        /* Move this to receive aim_flap_nop and send aim_flap_nop */
        if (!(sess->flags & AIM_SESS_FLAGS_DONTTIMEOUTONICBM))
                aim_cleansnacs(sess, 60); /* clean out SNACs over 60sec old */

        return 0;
}

/*
 * Simple wrapper for aim_im_sendch1_ext() 
 *
 * You cannot use aim_send_im if you need the HASICON flag.  You must
 * use aim_im_sendch1_ext directly for that.
 *
 * aim_send_im also cannot be used if you require UNICODE messages, because
 * that requires an explicit message length.  Use aim_im_sendch1_ext().
 *
 */
faim_export int aim_im_sendch1(aim_session_t *sess, const char *sn, fu16_t flags, const char *msg)
{
        struct aim_sendimext_args args;

        args.destsn = sn;
        args.flags = flags;
        args.msg = msg;
        args.msglen = strlen(msg);
        args.charset = 0x0000;
        args.charsubset = 0x0000;

        /* Make these don't get set by accident -- they need aim_im_sendch1_ext */
        args.flags &= ~(AIM_IMFLAGS_CUSTOMFEATURES | AIM_IMFLAGS_HASICON | AIM_IMFLAGS_MULTIPART);

        return aim_im_sendch1_ext(sess, &args);
}

/**
 * Subtype 0x0006 - Send your icon to a given user.
 *
 * This is also performance sensitive. (If you can believe it...)
 *
 */
faim_export int aim_im_sendch2_icon(aim_session_t *sess, const char *sn, const fu8_t *icon, int iconlen, time_t stamp, fu16_t iconsum)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;
        fu8_t ck[8];
        int i;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)))
                return -EINVAL;

        if (!sn || !icon || (iconlen <= 0) || (iconlen >= MAXICONLEN))
                return -EINVAL;

        for (i = 0; i < 8; i++)
                ck[i] = (fu8_t)rand();

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10+8+2+1+strlen(sn)+2+2+2+8+16+2+2+2+2+2+2+2+4+4+4+iconlen+strlen(AIM_ICONIDENT)+2+2)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* ICBM header */
        aim_im_puticbm(&fr->data, ck, 0x0002, sn);

        /*
         * TLV t(0005)
         *
         * Encompasses everything below.
         */
        aimbs_put16(&fr->data, 0x0005);
        aimbs_put16(&fr->data, 2+8+16+6+4+4+iconlen+4+4+4+strlen(AIM_ICONIDENT));

        aimbs_put16(&fr->data, 0x0000);
        aimbs_putraw(&fr->data, ck, 8);
        aim_putcap(&fr->data, AIM_CAPS_BUDDYICON);

        /* TLV t(000a) */
        aimbs_put16(&fr->data, 0x000a);
        aimbs_put16(&fr->data, 0x0002);
        aimbs_put16(&fr->data, 0x0001);

        /* TLV t(000f) */
        aimbs_put16(&fr->data, 0x000f);
        aimbs_put16(&fr->data, 0x0000);

        /* TLV t(2711) */
        aimbs_put16(&fr->data, 0x2711);
        aimbs_put16(&fr->data, 4+4+4+iconlen+strlen(AIM_ICONIDENT));
        aimbs_put16(&fr->data, 0x0000);
        aimbs_put16(&fr->data, iconsum);
        aimbs_put32(&fr->data, iconlen);
        aimbs_put32(&fr->data, stamp);
        aimbs_putraw(&fr->data, icon, iconlen);
        aimbs_putraw(&fr->data, AIM_ICONIDENT, strlen(AIM_ICONIDENT));

        /* TLV t(0003) */
        aimbs_put16(&fr->data, 0x0003);
        aimbs_put16(&fr->data, 0x0000);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/*
 * Subtype 0x0006 - Send a rich text message.
 *
 * This only works for ICQ 2001b (thats 2001 not 2000).  Better, only
 * send it to clients advertising the RTF capability.  In fact, if you send
 * it to a client that doesn't support that capability, the server will gladly
 * bounce it back to you.
 *
 * You'd think this would be in icq.c, but, well, I'm trying to stick with
 * the one-group-per-file scheme as much as possible.  This could easily
 * be an exception, since Rendezvous IMs are external of the Oscar core, 
 * and therefore are undefined.  Really I just need to think of a good way to
 * make an interface similar to what AOL actually uses.  But I'm not using COM.
 *
 */
faim_export int aim_im_sendch2_rtfmsg(aim_session_t *sess, struct aim_sendrtfmsg_args *args)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;
        fu8_t ck[8];
        const char rtfcap[] = {"{97B12751-243C-4334-AD22-D6ABF73F1492}"}; /* AIM_CAPS_ICQRTF capability in string form */
        int i, servdatalen;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)))
                return -EINVAL;

        if (!args || !args->destsn || !args->rtfmsg)
                return -EINVAL;

        servdatalen = 2+2+16+2+4+1+2  +  2+2+4+4+4  +  2+4+2+strlen(args->rtfmsg)+1  +  4+4+4+strlen(rtfcap)+1;

        for (i = 0; i < 8; i++)
                ck[i] = (fu8_t)rand();

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10+128+servdatalen)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* ICBM header */
        aim_im_puticbm(&fr->data, ck, 0x0002, args->destsn);

        /* TLV t(0005) - Encompasses everything below. */
        aimbs_put16(&fr->data, 0x0005);
        aimbs_put16(&fr->data, 2+8+16  +  2+2+2  +  2+2  +  2+2+servdatalen);

        aimbs_put16(&fr->data, 0x0000);
        aimbs_putraw(&fr->data, ck, 8);
        aim_putcap(&fr->data, AIM_CAPS_ICQSERVERRELAY);

        /* t(000a) l(0002) v(0001) */
        aimbs_put16(&fr->data, 0x000a);
        aimbs_put16(&fr->data, 0x0002);
        aimbs_put16(&fr->data, 0x0001);

        /* t(000f) l(0000) v() */
        aimbs_put16(&fr->data, 0x000f);
        aimbs_put16(&fr->data, 0x0000);

        /* Service Data TLV */
        aimbs_put16(&fr->data, 0x2711);
        aimbs_put16(&fr->data, servdatalen);

        aimbs_putle16(&fr->data, 11 + 16 /* 11 + (sizeof CLSID) */);
        aimbs_putle16(&fr->data, 9);
        aim_putcap(&fr->data, AIM_CAPS_EMPTY);
        aimbs_putle16(&fr->data, 0);
        aimbs_putle32(&fr->data, 0);
        aimbs_putle8(&fr->data, 0);
        aimbs_putle16(&fr->data, 0x03ea); /* trid1 */

        aimbs_putle16(&fr->data, 14);
        aimbs_putle16(&fr->data, 0x03eb); /* trid2 */
        aimbs_putle32(&fr->data, 0);
        aimbs_putle32(&fr->data, 0);
        aimbs_putle32(&fr->data, 0);

        aimbs_putle16(&fr->data, 0x0001);
        aimbs_putle32(&fr->data, 0);
        aimbs_putle16(&fr->data, strlen(args->rtfmsg)+1);
        aimbs_putraw(&fr->data, args->rtfmsg, strlen(args->rtfmsg)+1);

        aimbs_putle32(&fr->data, args->fgcolor);
        aimbs_putle32(&fr->data, args->bgcolor);
        aimbs_putle32(&fr->data, strlen(rtfcap)+1);
        aimbs_putraw(&fr->data, rtfcap, strlen(rtfcap)+1);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/**
 * Subtype 0x0006 - Send an "I want to directly connect to you" message
 *
 */
faim_export int aim_im_sendch2_odcrequest(aim_session_t *sess, fu8_t *cookie, const char *sn, const fu8_t *ip, fu16_t port)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;
        fu8_t ck[8];
        aim_tlvlist_t *tl = NULL, *itl = NULL;
        int hdrlen, i;
        fu8_t *hdr;
        aim_bstream_t hdrbs;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)))
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 256+strlen(sn))))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* 
         * Generate a random message cookie 
         *
         * This cookie needs to be alphanumeric and NULL-terminated to be 
         * TOC-compatible.
         *
         * XXX - have I mentioned these should be generated in msgcookie.c?
         *
         */
        for (i = 0; i < 7; i++)
                ck[i] = 0x30 + ((fu8_t) rand() % 10);
        ck[7] = '\0';

        if (cookie)
                memcpy(cookie, ck, 8);

        /* ICBM header */
        aim_im_puticbm(&fr->data, ck, 0x0002, sn);

        aim_addtlvtochain_noval(&tl, 0x0003);

        hdrlen = 2+8+16+6+8+6+4;
        hdr = malloc(hdrlen);
        aim_bstream_init(&hdrbs, hdr, hdrlen);

        aimbs_put16(&hdrbs, 0x0000);
        aimbs_putraw(&hdrbs, ck, 8);
        aim_putcap(&hdrbs, AIM_CAPS_DIRECTIM);

        aim_addtlvtochain16(&itl, 0x000a, 0x0001);
        aim_addtlvtochain_raw(&itl, 0x0003, 4, ip);
        aim_addtlvtochain16(&itl, 0x0005, port);
        aim_addtlvtochain_noval(&itl, 0x000f);
        
        aim_writetlvchain(&hdrbs, &itl);

        aim_addtlvtochain_raw(&tl, 0x0005, aim_bstream_curpos(&hdrbs), hdr);

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

        free(hdr);
        aim_freetlvchain(&itl);
        aim_freetlvchain(&tl);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/**
 * Subtype 0x0006 - Send an "I want to send you this file" message
 *
 */
faim_export int aim_im_sendch2_sendfile_ask(aim_session_t *sess, struct aim_oft_info *oft_info)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;
        aim_tlvlist_t *tl=NULL, *subtl=NULL;
        int i;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)) || !oft_info)
                return -EINVAL;

        /* XXX - Should be like "21CBF95" and null terminated */
        for (i = 0; i < 7; i++)
                oft_info->cookie[i] = 0x30 + ((fu8_t)rand() % 10);
        oft_info->cookie[7] = '\0';

        { /* Create the subTLV chain */
                fu8_t *buf;
                int buflen;
                aim_bstream_t bs;

                aim_addtlvtochain16(&subtl, 0x000a, 0x0001);
                aim_addtlvtochain_noval(&subtl, 0x000f);
/*              aim_addtlvtochain_raw(&subtl, 0x000e, 2, "en");
                aim_addtlvtochain_raw(&subtl, 0x000d, 8, "us-ascii");
                aim_addtlvtochain_raw(&subtl, 0x000c, 24, "Please accept this file."); */
                if (oft_info->clientip) {
                        fu8_t ip[4];
                        char *nexttoken;
                        int i = 0;
                        nexttoken = strtok(oft_info->clientip, ".");
                        while (nexttoken && i<4) {
                                ip[i] = atoi(nexttoken);
                                nexttoken = strtok(NULL, ".");
                                i++;
                        }
                        aim_addtlvtochain_raw(&subtl, 0x0003, 4, ip);
                }
                aim_addtlvtochain16(&subtl, 0x0005, oft_info->port);

                /* TLV t(2711) */
                buflen = 2+2+4+strlen(oft_info->fh.name)+1;
                buf = malloc(buflen);
                aim_bstream_init(&bs, buf, buflen);
                aimbs_put16(&bs, (oft_info->fh.totfiles > 1) ? 0x0002 : 0x0001);
                aimbs_put16(&bs, oft_info->fh.totfiles);
                aimbs_put32(&bs, oft_info->fh.totsize);

                /* Filename - NULL terminated, for some odd reason */
                aimbs_putraw(&bs, oft_info->fh.name, strlen(oft_info->fh.name));
                aimbs_put8(&bs, 0x00);

                aim_addtlvtochain_raw(&subtl, 0x2711, bs.len, bs.data);
                free(buf);
        }

        { /* Create the main TLV chain */
                fu8_t *buf;
                int buflen;
                aim_bstream_t bs;

                /* TLV t(0005) - Encompasses everything from above. Gee. */
                buflen = 2+8+16+aim_sizetlvchain(&subtl);
                buf = malloc(buflen);
                aim_bstream_init(&bs, buf, buflen);
                aimbs_put16(&bs, AIM_RENDEZVOUS_PROPOSE);
                aimbs_putraw(&bs, oft_info->cookie, 8);
                aim_putcap(&bs, AIM_CAPS_SENDFILE);
                aim_writetlvchain(&bs, &subtl);
                aim_freetlvchain(&subtl);
                aim_addtlvtochain_raw(&tl, 0x0005, bs.len, bs.data);
                free(buf);

                /* TLV t(0003) - Request an ack */
                aim_addtlvtochain_noval(&tl, 0x0003);
        }

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10 + 11+strlen(oft_info->sn) + aim_sizetlvchain(&tl))))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, AIM_SNACFLAGS_DESTRUCTOR, oft_info->cookie, sizeof(oft_info->cookie));
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* ICBM header */
        aim_im_puticbm(&fr->data, oft_info->cookie, 0x0002, oft_info->sn);

        /* All that crap from above (the 0x0005 TLV and the 0x0003 TLV) */
        aim_writetlvchain(&fr->data, &tl);
        aim_freetlvchain(&tl);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/**
 * Subtype 0x0006 - Send an "I will accept this file" message?
 *
 * @param rendid Capability type (AIM_CAPS_GETFILE or AIM_CAPS_SENDFILE)
 */
faim_export int aim_im_sendch2_sendfile_accept(aim_session_t *sess, struct aim_oft_info *oft_info)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)) || !oft_info)
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10 + 11+strlen(oft_info->sn) + 4+2+8+16)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* ICBM header */
        aim_im_puticbm(&fr->data, oft_info->cookie, 0x0002, oft_info->sn);

        aimbs_put16(&fr->data, 0x0005);
        aimbs_put16(&fr->data, 0x001a);
        aimbs_put16(&fr->data, AIM_RENDEZVOUS_ACCEPT);
        aimbs_putraw(&fr->data, oft_info->cookie, 8);
        aim_putcap(&fr->data, AIM_CAPS_SENDFILE);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/**
 * Subtype 0x0006 - Send a "cancel this file transfer" message?
 *
 */
faim_export int aim_im_sendch2_sendfile_cancel(aim_session_t *sess, struct aim_oft_info *oft_info)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)) || !oft_info)
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10 + 11+strlen(oft_info->sn) + 4+2+8+16)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* ICBM header */
        aim_im_puticbm(&fr->data, oft_info->cookie, 0x0002, oft_info->sn);

        aimbs_put16(&fr->data, 0x0005);
        aimbs_put16(&fr->data, 0x001a);
        aimbs_put16(&fr->data, AIM_RENDEZVOUS_CANCEL);
        aimbs_putraw(&fr->data, oft_info->cookie, 8);
        aim_putcap(&fr->data, AIM_CAPS_SENDFILE);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/**
 * Subtype 0x0006 - Request the status message of the given ICQ user.
 *
 * @param sess The oscar session.
 * @param sn The UIN of the user of whom you wish to request info.
 * @param type The type of info you wish to request.  This should be the current 
 *        state of the user, as one of the AIM_ICQ_STATE_* defines.
 * @return Return 0 if no errors, otherwise return the error number.
 */
faim_export int aim_im_sendch2_geticqaway(aim_session_t *sess, const char *sn, int type)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;
        int i;
        fu8_t ck[8];

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)) || !sn)
                return -EINVAL;

        for (i = 0; i < 8; i++)
                ck[i] = (fu8_t)rand();

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10+8+2+1+strlen(sn) + 4+0x5e + 4)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* ICBM header */
        aim_im_puticbm(&fr->data, ck, 0x0002, sn);

        /* TLV t(0005) - Encompasses almost everything below. */
        aimbs_put16(&fr->data, 0x0005); /* T */
        aimbs_put16(&fr->data, 0x005e); /* L */
        { /* V */
                aimbs_put16(&fr->data, 0x0000);

                /* Cookie */
                aimbs_putraw(&fr->data, ck, 8);

                /* Put the 16 byte server relay capability */
                aim_putcap(&fr->data, AIM_CAPS_ICQSERVERRELAY);

                /* TLV t(000a) */
                aimbs_put16(&fr->data, 0x000a);
                aimbs_put16(&fr->data, 0x0002);
                aimbs_put16(&fr->data, 0x0001);

                /* TLV t(000f) */
                aimbs_put16(&fr->data, 0x000f);
                aimbs_put16(&fr->data, 0x0000);

                /* TLV t(2711) */
                aimbs_put16(&fr->data, 0x2711);
                aimbs_put16(&fr->data, 0x0036);
                { /* V */
                        aimbs_putle16(&fr->data, 0x001b); /* L */
                        aimbs_putle16(&fr->data, 0x0008); /* XXX - Protocol version */
                        aim_putcap(&fr->data, AIM_CAPS_EMPTY);
                        aimbs_putle16(&fr->data, 0x0000); /* Unknown */
                        aimbs_putle16(&fr->data, 0x0003); /* Client features? */
                        aimbs_putle16(&fr->data, 0x0000); /* Unknown */
                        aimbs_putle8(&fr->data, 0x00); /* Unkizown */
                        aimbs_putle16(&fr->data, 0xffff); /* Sequence number?  XXX - This should decrement by 1 with each request */

                        aimbs_putle16(&fr->data, 0x000e); /* L */
                        aimbs_putle16(&fr->data, 0xffff); /* Sequence number?  XXX - This should decrement by 1 with each request */
                        aimbs_putle32(&fr->data, 0x00000000); /* Unknown */
                        aimbs_putle32(&fr->data, 0x00000000); /* Unknown */
                        aimbs_putle32(&fr->data, 0x00000000); /* Unknown */

                        /* The type of status message being requested */
                        if (type & AIM_ICQ_STATE_CHAT)
                                aimbs_putle16(&fr->data, 0x03ec);
                        else if(type & AIM_ICQ_STATE_DND)
                                aimbs_putle16(&fr->data, 0x03eb);
                        else if(type & AIM_ICQ_STATE_OUT)
                                aimbs_putle16(&fr->data, 0x03ea);
                        else if(type & AIM_ICQ_STATE_BUSY)
                                aimbs_putle16(&fr->data, 0x03e9);
                        else if(type & AIM_ICQ_STATE_AWAY)
                                aimbs_putle16(&fr->data, 0x03e8);

                        aimbs_putle16(&fr->data, 0x0000); /* Status? */
                        aimbs_putle16(&fr->data, 0x0001); /* Priority of this message? */
                        aimbs_putle16(&fr->data, 0x0001); /* L */
                        aimbs_putle8(&fr->data, 0x00); /* String of length L */
                } /* End TLV t(2711) */
        } /* End TLV t(0005) */

        /* TLV t(0003) */
        aimbs_put16(&fr->data, 0x0003);
        aimbs_put16(&fr->data, 0x0000);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/**
 * Subtype 0x0006 - Send an ICQ-esque ICBM.
 *
 * This can be used to send an ICQ authorization reply (deny or grant).  It is the "old way."  
 * The new way is to use SSI.  I like the new way a lot better.  This seems like such a hack, 
 * mostly because it's in network byte order.  Figuring this stuff out sometimes takes a while, 
 * but thats ok, because it gives me time to try to figure out what kind of drugs the AOL people 
 * were taking when they merged the two protocols.
 *
 * @param sn The destination screen name.
 * @param type The type of message.  0x0007 for authorization denied.  0x0008 for authorization granted.
 * @param message The message you want to send, it should be null terminated.
 * @return Return 0 if no errors, otherwise return the error number.
 */
faim_export int aim_im_sendch4(aim_session_t *sess, char *sn, fu16_t type, fu8_t *message)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;
        int i;
        char ck[8];

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0002)))
                return -EINVAL;

        if (!sn || !type || !message)
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10+8+3+strlen(sn)+12+strlen(message)+1+4)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0006, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0006, 0x0000, snacid);

        /* Cookie */
        for (i=0; i<8; i++)
                ck[i] = (fu8_t)rand();

        /* ICBM header */
        aim_im_puticbm(&fr->data, ck, 0x0004, sn);

        /*
         * TLV t(0005)
         *
         * ICQ data (the UIN and the message).
         */
        aimbs_put16(&fr->data, 0x0005);
        aimbs_put16(&fr->data, 4 + 2+2+strlen(message)+1);

        /*
         * Your UIN
         */
        aimbs_putle32(&fr->data, atoi(sess->sn));

        /*
         * TLV t(type) l(strlen(message)+1) v(message+NULL)
         */
        aimbs_putle16(&fr->data, type);
        aimbs_putle16(&fr->data, strlen(message)+1);
        aimbs_putraw(&fr->data, message, strlen(message)+1);

        /*
         * TLV t(0006) l(0000) v()
         */
        aimbs_put16(&fr->data, 0x0006);
        aimbs_put16(&fr->data, 0x0000);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/*
 * XXX - I don't see when this would ever get called...
 */
static int outgoingim(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        int i, ret = 0;
        aim_rxcallback_t userfunc;
        fu8_t cookie[8];
        fu16_t channel;
        aim_tlvlist_t *tlvlist;
        char *sn;
        int snlen;
        fu16_t icbmflags = 0;
        fu8_t flag1 = 0, flag2 = 0;
        fu8_t *msg = NULL;
        aim_tlv_t *msgblock;

        /* ICBM Cookie. */
        for (i = 0; i < 8; i++)
                cookie[i] = aimbs_get8(bs);

        /* Channel ID */
        channel = aimbs_get16(bs);

        if (channel != 0x01) {
                faimdprintf(sess, 0, "icbm: ICBM recieved on unsupported channel.  Ignoring. (chan = %04x)\n", channel);
                return 0;
        }

        snlen = aimbs_get8(bs);
        sn = aimbs_getstr(bs, snlen);

        tlvlist = aim_readtlvchain(bs);

        if (aim_gettlv(tlvlist, 0x0003, 1))
                icbmflags |= AIM_IMFLAGS_ACK;
        if (aim_gettlv(tlvlist, 0x0004, 1))
                icbmflags |= AIM_IMFLAGS_AWAY;

        if ((msgblock = aim_gettlv(tlvlist, 0x0002, 1))) {
                aim_bstream_t mbs;
                int featurelen, msglen;

                aim_bstream_init(&mbs, msgblock->value, msgblock->length);

                aimbs_get8(&mbs);
                aimbs_get8(&mbs);
                for (featurelen = aimbs_get16(&mbs); featurelen; featurelen--)
                        aimbs_get8(&mbs);
                aimbs_get8(&mbs);
                aimbs_get8(&mbs);

                msglen = aimbs_get16(&mbs) - 4; /* final block length */

                flag1 = aimbs_get16(&mbs);
                flag2 = aimbs_get16(&mbs);

                msg = aimbs_getstr(&mbs, msglen);
        }

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype)))
                ret = userfunc(sess, rx, channel, sn, msg, icbmflags, flag1, flag2);

        free(sn);
        aim_freetlvchain(&tlvlist);

        return ret;
}

/*
 * Ahh, the joys of nearly ridiculous over-engineering.
 *
 * Not only do AIM ICBM's support multiple channels.  Not only do they
 * support multiple character sets.  But they support multiple character 
 * sets / encodings within the same ICBM.
 *
 * These multipart messages allow for complex space savings techniques, which
 * seem utterly unnecessary by today's standards.  In fact, there is only
 * one client still in popular use that still uses this method: AOL for the
 * Macintosh, Version 5.0.  Obscure, yes, I know.  
 *
 * In modern (non-"legacy") clients, if the user tries to send a character
 * that is not ISO-8859-1 or ASCII, the client will send the entire message
 * as UNICODE, meaning that every character in the message will occupy the
 * full 16 bit UNICODE field, even if the high order byte would be zero.
 * Multipart messages prevent this wasted space by allowing the client to
 * only send the characters in UNICODE that need to be sent that way, and
 * the rest of the message can be sent in whatever the native character 
 * set is (probably ASCII).
 *
 * An important note is that sections will be displayed in the order that
 * they appear in the ICBM.  There is no facility for merging or rearranging
 * sections at run time.  So if you have, say, ASCII then UNICODE then ASCII,
 * you must supply two ASCII sections with a UNICODE in the middle, and incur
 * the associated overhead.
 *
 * Normally I would have laughed and given a firm 'no' to supporting this
 * seldom-used feature, but something is attracting me to it.  In the future,
 * it may be possible to abuse this to send mixed-media messages to other
 * open source clients (like encryption or something) -- see faimtest for
 * examples of how to do this.
 *
 * I would definitly recommend avoiding this feature unless you really
 * know what you are doing, and/or you have something neat to do with it.
 *
 */
faim_export int aim_mpmsg_init(aim_session_t *sess, aim_mpmsg_t *mpm)
{

        memset(mpm, 0, sizeof(aim_mpmsg_t));

        return 0;
}

static int mpmsg_addsection(aim_session_t *sess, aim_mpmsg_t *mpm, fu16_t charset, fu16_t charsubset, fu8_t *data, fu16_t datalen)
{
        aim_mpmsg_section_t *sec; 
        
        if (!(sec = malloc(sizeof(aim_mpmsg_section_t))))
                return -1;

        sec->charset = charset;
        sec->charsubset = charsubset;
        sec->data = data;
        sec->datalen = datalen;
        sec->next = NULL;

        if (!mpm->parts)
                mpm->parts = sec;
        else {
                aim_mpmsg_section_t *cur;

                for (cur = mpm->parts; cur->next; cur = cur->next)
                        ;
                cur->next = sec;
        }

        mpm->numparts++;

        return 0;
}

faim_export int aim_mpmsg_addraw(aim_session_t *sess, aim_mpmsg_t *mpm, fu16_t charset, fu16_t charsubset, const fu8_t *data, fu16_t datalen)
{
        fu8_t *dup;

        if (!(dup = malloc(datalen)))
                return -1;
        memcpy(dup, data, datalen);

        if (mpmsg_addsection(sess, mpm, charset, charsubset, dup, datalen) == -1) {
                free(dup);
                return -1;
        }

        return 0;
}

/* XXX - should provide a way of saying ISO-8859-1 specifically */
faim_export int aim_mpmsg_addascii(aim_session_t *sess, aim_mpmsg_t *mpm, const char *ascii)
{
        fu8_t *dup;

        if (!(dup = strdup(ascii))) 
                return -1;

        if (mpmsg_addsection(sess, mpm, 0x0000, 0x0000, dup, strlen(ascii)) == -1) {
                free(dup);
                return -1;
        }

        return 0;
}

faim_export int aim_mpmsg_addunicode(aim_session_t *sess, aim_mpmsg_t *mpm, const fu16_t *unicode, fu16_t unicodelen)
{
        fu8_t *buf;
        aim_bstream_t bs;
        int i;

        if (!(buf = malloc(unicodelen * 2)))
                return -1;

        aim_bstream_init(&bs, buf, unicodelen * 2);

        /* We assume unicode is in /host/ byte order -- convert to network */
        for (i = 0; i < unicodelen; i++)
                aimbs_put16(&bs, unicode[i]);

        if (mpmsg_addsection(sess, mpm, 0x0002, 0x0000, buf, aim_bstream_curpos(&bs)) == -1) {
                free(buf);
                return -1;
        }
        
        return 0;
}

faim_export void aim_mpmsg_free(aim_session_t *sess, aim_mpmsg_t *mpm)
{
        aim_mpmsg_section_t *cur;

        for (cur = mpm->parts; cur; ) {
                aim_mpmsg_section_t *tmp;
                
                tmp = cur->next;
                free(cur->data);
                free(cur);
                cur = tmp;
        }
        
        mpm->numparts = 0;
        mpm->parts = NULL;

        return;
}

/*
 * Start by building the multipart structures, then pick the first 
 * human-readable section and stuff it into args->msg so no one gets
 * suspicious.
 *
 */
static int incomingim_ch1_parsemsgs(aim_session_t *sess, fu8_t *data, int len, struct aim_incomingim_ch1_args *args)
{
        static const fu16_t charsetpri[] = {
                0x0000, /* ASCII first */
                0x0003, /* then ISO-8859-1 */
                0x0002, /* UNICODE as last resort */
        };
        static const int charsetpricount = 3;
        int i;
        aim_bstream_t mbs;
        aim_mpmsg_section_t *sec;

        aim_bstream_init(&mbs, data, len);

        while (aim_bstream_empty(&mbs)) {
                fu16_t msglen, flag1, flag2;
                fu8_t *msgbuf;

                aimbs_get8(&mbs); /* 01 */
                aimbs_get8(&mbs); /* 01 */

                /* Message string length, including character set info. */
                msglen = aimbs_get16(&mbs);

                /* Character set info */
                flag1 = aimbs_get16(&mbs);
                flag2 = aimbs_get16(&mbs);

                /* Message. */
                msglen -= 4;

                /*
                 * For now, we don't care what the encoding is.  Just copy
                 * it into a multipart struct and deal with it later. However,
                 * always pad the ending with a NULL.  This makes it easier
                 * to treat ASCII sections as strings.  It won't matter for
                 * UNICODE or binary data, as you should never read past
                 * the specified data length, which will not include the pad.
                 *
                 * XXX - There's an API bug here.  For sending, the UNICODE is
                 * given in host byte order (aim_mpmsg_addunicode), but here
                 * the received messages are given in network byte order.
                 *
                 */
                msgbuf = aimbs_getstr(&mbs, msglen);
                mpmsg_addsection(sess, &args->mpmsg, flag1, flag2, msgbuf, msglen);

        } /* while */

        args->icbmflags |= AIM_IMFLAGS_MULTIPART; /* always set */

        /*
         * Clients that support multiparts should never use args->msg, as it
         * will point to an arbitrary section.
         *
         * Here, we attempt to provide clients that do not support multipart
         * messages with something to look at -- hopefully a human-readable
         * string.  But, failing that, a UNICODE message, or nothing at all.
         *
         * Which means that even if args->msg is NULL, it does not mean the
         * message was blank.
         *
         */
        for (i = 0; i < charsetpricount; i++) {
                for (sec = args->mpmsg.parts; sec; sec = sec->next) {

                        if (sec->charset != charsetpri[i])
                                continue;

                        /* Great. We found one.  Fill it in. */
                        args->charset = sec->charset;
                        args->charsubset = sec->charsubset;

                        /* Set up the simple flags */
                        if (args->charset == 0x0000)
                                ; /* ASCII */
                        else if (args->charset == 0x0002)
                                args->icbmflags |= AIM_IMFLAGS_UNICODE;
                        else if (args->charset == 0x0003)
                                args->icbmflags |= AIM_IMFLAGS_ISO_8859_1;
                        else if (args->charset == 0xffff)
                                ; /* no encoding (yeep!) */

                        if (args->charsubset == 0x0000)
                                ; /* standard subencoding? */
                        else if (args->charsubset == 0x000b)
                                args->icbmflags |= AIM_IMFLAGS_SUBENC_MACINTOSH;
                        else if (args->charsubset == 0xffff)
                                ; /* no subencoding */

                        args->msg = sec->data;
                        args->msglen = sec->datalen;

                        return 0;
                }
        }

        /* No human-readable sections found.  Oh well. */
        args->charset = args->charsubset = 0xffff;
        args->msg = NULL;
        args->msglen = 0;

        return 0;
}

static int incomingim_ch1(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, fu16_t channel, aim_userinfo_t *userinfo, aim_bstream_t *bs, fu8_t *cookie)
{
        fu16_t type, length;
        aim_rxcallback_t userfunc;
        int ret = 0;
        struct aim_incomingim_ch1_args args;
        int endpos;

        memset(&args, 0, sizeof(args));

        aim_mpmsg_init(sess, &args.mpmsg);

        /*
         * This used to be done using tlvchains.  For performance reasons,
         * I've changed it to process the TLVs in-place.  This avoids lots
         * of per-IM memory allocations.
         */
        while (aim_bstream_empty(bs)) {

                type = aimbs_get16(bs);
                length = aimbs_get16(bs);

                endpos = aim_bstream_curpos(bs) + length;

                if (type == 0x0002) { /* Message Block */

                        /*
                         * This TLV consists of the following:
                         *   - 0501 -- Unknown
                         *   - Features: Don't know how to interpret these
                         *   - 0101 -- Unknown
                         *   - Message
                         *
                         */

                        aimbs_get8(bs); /* 05 */
                        aimbs_get8(bs); /* 01 */

                        args.featureslen = aimbs_get16(bs);
                        /* XXX XXX this is all evil! */
                        args.features = bs->data + bs->offset;
                        aim_bstream_advance(bs, args.featureslen);
                        args.icbmflags |= AIM_IMFLAGS_CUSTOMFEATURES;

                        /*
                         * The rest of the TLV contains one or more message
                         * blocks...
                         */
                        incomingim_ch1_parsemsgs(sess, bs->data + bs->offset /* XXX evil!!! */, length - 2 - 2 - args.featureslen, &args);

                } else if (type == 0x0003) { /* Server Ack Requested */

                        args.icbmflags |= AIM_IMFLAGS_ACK;

                } else if (type == 0x0004) { /* Message is Auto Response */

                        args.icbmflags |= AIM_IMFLAGS_AWAY;

                } else if (type == 0x0006) { /* Message was received offline. */

                        /* XXX - not sure if this actually gets sent. */
                        args.icbmflags |= AIM_IMFLAGS_OFFLINE;

                } else if (type == 0x0008) { /* I-HAVE-A-REALLY-PURTY-ICON Flag */

                        args.iconlen = aimbs_get32(bs);
                        aimbs_get16(bs); /* 0x0001 */
                        args.iconsum = aimbs_get16(bs);
                        args.iconstamp = aimbs_get32(bs);

                        /*
                         * This looks to be a client bug.  MacAIM 4.3 will
                         * send this tag, but with all zero values, in the
                         * first message of a conversation. This makes no
                         * sense whatsoever, so I'm going to say its a bug.
                         *
                         * You really shouldn't advertise a zero-length icon
                         * anyway.
                         * 
                         */
                        if (args.iconlen)
                                args.icbmflags |= AIM_IMFLAGS_HASICON;

                } else if (type == 0x0009) {

                        args.icbmflags |= AIM_IMFLAGS_BUDDYREQ;

                } else if (type == 0x000b) { /* Non-direct connect typing notification */

                        args.icbmflags |= AIM_IMFLAGS_TYPINGNOT;

                } else if (type == 0x0017) {

                        args.extdatalen = length;
                        args.extdata = aimbs_getraw(bs, args.extdatalen);

                } else {
                        faimdprintf(sess, 0, "incomingim_ch1: unknown TLV 0x%04x (len %d)\n", type, length);
                }

                /*
                 * This is here to protect ourselves from ourselves.  That
                 * is, if something above doesn't completly parse its value
                 * section, or, worse, overparses it, this will set the
                 * stream where it needs to be in order to land on the next
                 * TLV when the loop continues.
                 *
                 */
                aim_bstream_setpos(bs, endpos);
        }


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

        aim_mpmsg_free(sess, &args.mpmsg);
        free(args.extdata);

        return ret;
}

static void incomingim_ch2_buddylist(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_userinfo_t *userinfo, struct aim_incomingim_ch2_args *args, aim_bstream_t *servdata)
{

        /*
         * This goes like this...
         *
         *   group name length
         *   group name
         *     num of buddies in group
         *     buddy name length
         *     buddy name
         *     buddy name length
         *     buddy name
         *     ...
         *   group name length
         *   group name
         *     num of buddies in group
         *     buddy name length
         *     buddy name
         *     ...
         *   ...
         */
        while (servdata && aim_bstream_empty(servdata)) {
                fu16_t gnlen, numb;
                int i;
                char *gn;

                gnlen = aimbs_get16(servdata);
                gn = aimbs_getstr(servdata, gnlen);
                numb = aimbs_get16(servdata);

                for (i = 0; i < numb; i++) {
                        fu16_t bnlen;
                        char *bn;

                        bnlen = aimbs_get16(servdata);
                        bn = aimbs_getstr(servdata, bnlen);

                        faimdprintf(sess, 0, "got a buddy list from %s: group %s, buddy %s\n", userinfo->sn, gn, bn);

                        free(bn);
                }

                free(gn);
        }

        return;
}

static void incomingim_ch2_buddyicon_free(aim_session_t *sess, struct aim_incomingim_ch2_args *args)
{

        free(args->info.icon.icon);

        return;
}

static void incomingim_ch2_buddyicon(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_userinfo_t *userinfo, struct aim_incomingim_ch2_args *args, aim_bstream_t *servdata)
{

        if (servdata) {
                args->info.icon.checksum = aimbs_get32(servdata);
                args->info.icon.length = aimbs_get32(servdata);
                args->info.icon.timestamp = aimbs_get32(servdata);
                args->info.icon.icon = aimbs_getraw(servdata, args->info.icon.length);
        }

        args->destructor = (void *)incomingim_ch2_buddyicon_free;

        return;
}

static void incomingim_ch2_chat_free(aim_session_t *sess, struct aim_incomingim_ch2_args *args)
{

        /* XXX - aim_chat_roominfo_free() */
        free(args->info.chat.roominfo.name);

        return;
}

static void incomingim_ch2_chat(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_userinfo_t *userinfo, struct aim_incomingim_ch2_args *args, aim_bstream_t *servdata)
{

        /*
         * Chat room info.
         */
        if (servdata)
                aim_chat_readroominfo(servdata, &args->info.chat.roominfo);

        args->destructor = (void *)incomingim_ch2_chat_free;

        return;
}

static void incomingim_ch2_icqserverrelay_free(aim_session_t *sess, struct aim_incomingim_ch2_args *args)
{

        free((char *)args->info.rtfmsg.rtfmsg);

        return;
}

/*
 * The relationship between AIM_CAPS_ICQSERVERRELAY and AIM_CAPS_ICQRTF is 
 * kind of odd. This sends the client ICQRTF since that is all that I've seen
 * SERVERRELAY used for.
 *
 * Note that this is all little-endian.  Cringe.
 *
 */
static void incomingim_ch2_icqserverrelay(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_userinfo_t *userinfo, struct aim_incomingim_ch2_args *args, aim_bstream_t *servdata)
{
        fu16_t hdrlen, anslen, msglen;
        fu16_t msgtype;

        hdrlen = aimbs_getle16(servdata);
        aim_bstream_advance(servdata, hdrlen);

        hdrlen = aimbs_getle16(servdata);
        aim_bstream_advance(servdata, hdrlen);

        msgtype = aimbs_getle16(servdata);
        
        anslen = aimbs_getle32(servdata);
        aim_bstream_advance(servdata, anslen);

        msglen = aimbs_getle16(servdata);
        args->info.rtfmsg.rtfmsg = aimbs_getstr(servdata, msglen);

        args->info.rtfmsg.fgcolor = aimbs_getle32(servdata);
        args->info.rtfmsg.bgcolor = aimbs_getle32(servdata);

        hdrlen = aimbs_getle32(servdata);
        aim_bstream_advance(servdata, hdrlen);

        /* XXX - This is such a hack. */
        args->reqclass = AIM_CAPS_ICQRTF;

        args->destructor = (void *)incomingim_ch2_icqserverrelay_free;

        return;
}

static void incomingim_ch2_sendfile_free(aim_session_t *sess, struct aim_incomingim_ch2_args *args)
{
        free(args->info.sendfile.filename);
}

static void incomingim_ch2_sendfile(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_userinfo_t *userinfo, struct aim_incomingim_ch2_args *args, aim_bstream_t *servdata)
{

        args->destructor = (void *)incomingim_ch2_sendfile_free;

        /* Maybe there is a better way to tell what kind of sendfile 
         * this is?  Maybe TLV t(000a)? */
        if (servdata) { /* Someone is sending us a file */
                int flen;

                /* subtype is one of AIM_OFT_SUBTYPE_* */
                args->info.sendfile.subtype = aimbs_get16(servdata);
                args->info.sendfile.totfiles = aimbs_get16(servdata);
                args->info.sendfile.totsize = aimbs_get32(servdata);

                /*
                 * I hope to God I'm right when I guess that there is a 
                 * 32 char max filename length for single files.  I think 
                 * OFT tends to do that.  Gotta love inconsistency.  I saw 
                 * a 26 byte filename?
                 */
                /* AAA - create an aimbs_getnullstr function (don't anymore)(maybe) */
                /* Use an inelegant way of getting the null-terminated filename, 
                 * since there's no easy bstream routine. */
                for (flen = 0; aimbs_get8(servdata); flen++);
                aim_bstream_advance(servdata, -flen -1);
                args->info.sendfile.filename = aimbs_getstr(servdata, flen);

                /* There is sometimes more after the null-terminated filename, 
                 * but I'm unsure of its format. */
                /* I don't believe him. */
        }

        return;
}

typedef void (*ch2_args_destructor_t)(aim_session_t *sess, struct aim_incomingim_ch2_args *args);

static int incomingim_ch2(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, fu16_t channel, aim_userinfo_t *userinfo, aim_tlvlist_t *tlvlist, fu8_t *cookie)
{
        aim_rxcallback_t userfunc;
        aim_tlv_t *block1, *servdatatlv;
        aim_tlvlist_t *list2;
        struct aim_incomingim_ch2_args args;
        aim_bstream_t bbs, sdbs, *sdbsptr = NULL;
        fu8_t *cookie2;
        int ret = 0;

        char proxyip[30] = {""};
        char clientip[30] = {""};
        char verifiedip[30] = {""};

        memset(&args, 0, sizeof(args));

        /*
         * There's another block of TLVs embedded in the type 5 here. 
         */
        block1 = aim_gettlv(tlvlist, 0x0005, 1);
        aim_bstream_init(&bbs, block1->value, block1->length);

        /*
         * First two bytes represent the status of the connection.
         *
         * 0 is a request, 1 is a cancel, 2 is an accept
         */ 
        args.status = aimbs_get16(&bbs);

        /*
         * Next comes the cookie.  Should match the ICBM cookie.
         */
        cookie2 = aimbs_getraw(&bbs, 8);
        if (memcmp(cookie, cookie2, 8) != 0) 
                faimdprintf(sess, 0, "rend: warning cookies don't match!\n");
        memcpy(args.cookie, cookie2, 8);
        free(cookie2);

        /*
         * The next 16bytes are a capability block so we can
         * identify what type of rendezvous this is.
         */
        args.reqclass = aim_getcap(sess, &bbs, 0x10);

        /* 
         * What follows may be TLVs or nothing, depending on the
         * purpose of the message.
         *
         * Ack packets for instance have nothing more to them.
         */
        list2 = aim_readtlvchain(&bbs);

        /*
         * IP address to proxy the file transfer through.
         *
         * XXX - I don't like this.  Maybe just read in an int?  Or inet_ntoa...
         */
        if (aim_gettlv(list2, 0x0002, 1)) {
                aim_tlv_t *iptlv;

                iptlv = aim_gettlv(list2, 0x0002, 1);
                if (iptlv->length == 4)
                        snprintf(proxyip, sizeof(proxyip), "%hhd.%hhd.%hhd.%hhd",
                                iptlv->value[0], iptlv->value[1],
                                iptlv->value[2], iptlv->value[3]);
        }

        /*
         * IP address from the perspective of the client.
         */
        if (aim_gettlv(list2, 0x0003, 1)) {
                aim_tlv_t *iptlv;

                iptlv = aim_gettlv(list2, 0x0003, 1);
                if (iptlv->length == 4)
                        snprintf(clientip, sizeof(clientip), "%hhd.%hhd.%hhd.%hhd",
                                iptlv->value[0], iptlv->value[1],
                                iptlv->value[2], iptlv->value[3]);
        }

        /*
         * Verified IP address (from the perspective of Oscar).
         *
         * This is added by the server.
         */
        if (aim_gettlv(list2, 0x0004, 1)) {
                aim_tlv_t *iptlv;

                iptlv = aim_gettlv(list2, 0x0004, 1);
                if (iptlv->length == 4)
                        snprintf(verifiedip, sizeof(verifiedip), "%hhd.%hhd.%hhd.%hhd",
                                iptlv->value[0], iptlv->value[1],
                                iptlv->value[2], iptlv->value[3]);
        }

        /*
         * Port number for something.
         */
        if (aim_gettlv(list2, 0x0005, 1))
                args.port = aim_gettlv16(list2, 0x0005, 1);

        /*
         * Something to do with ft -- two bytes
         * 0x0001 - "I want to send you this file"
         * 0x0002 - "I will accept this file from you"
         */
        if (aim_gettlv(list2, 0x000a, 1))
                ;

        /*
         * Error code.
         */
        if (aim_gettlv(list2, 0x000b, 1))
                args.errorcode = aim_gettlv16(list2, 0x000b, 1);

        /*
         * Invitation message / chat description.
         */
        if (aim_gettlv(list2, 0x000c, 1))
                args.msg = aim_gettlv_str(list2, 0x000c, 1);

        /*
         * Character set.
         */
        if (aim_gettlv(list2, 0x000d, 1))
                args.encoding = aim_gettlv_str(list2, 0x000d, 1);
        
        /*
         * Language.
         */
        if (aim_gettlv(list2, 0x000e, 1))
                args.language = aim_gettlv_str(list2, 0x000e, 1);

        /*
         * Unknown -- no value
         *
         * Maybe means we should connect directly to transfer the file?
         */
        if (aim_gettlv(list2, 0x000f, 1))
                ;

        /*
         * Unknown -- no value
         *
         * Maybe means we should proxy the file transfer through an AIM server?
         */
        if (aim_gettlv(list2, 0x0010, 1))
                ;

        if (strlen(proxyip))
                args.proxyip = (char *)proxyip;
        if (strlen(clientip))
                args.clientip = (char *)clientip;
        if (strlen(verifiedip))
                args.verifiedip = (char *)verifiedip;

        /*
         * This must be present in PROPOSALs, but will probably not
         * exist in CANCELs and ACCEPTs.
         *
         * Service Data blocks are module-specific in format.
         */
        if ((servdatatlv = aim_gettlv(list2, 0x2711 /* 10001 */, 1))) {

                aim_bstream_init(&sdbs, servdatatlv->value, servdatatlv->length);
                sdbsptr = &sdbs;
        }

        /*
         * The rest of the handling depends on what type it is.
         *
         * Not all of them have special handling (yet).
         */
        if (args.reqclass & AIM_CAPS_BUDDYICON)
                incomingim_ch2_buddyicon(sess, mod, rx, snac, userinfo, &args, sdbsptr);
        else if (args.reqclass & AIM_CAPS_SENDBUDDYLIST)
                incomingim_ch2_buddylist(sess, mod, rx, snac, userinfo, &args, sdbsptr);
        else if (args.reqclass & AIM_CAPS_CHAT)
                incomingim_ch2_chat(sess, mod, rx, snac, userinfo, &args, sdbsptr);
        else if (args.reqclass & AIM_CAPS_ICQSERVERRELAY)
                incomingim_ch2_icqserverrelay(sess, mod, rx, snac, userinfo, &args, sdbsptr);
        else if (args.reqclass & AIM_CAPS_SENDFILE)
                incomingim_ch2_sendfile(sess, mod, rx, snac, userinfo, &args, sdbsptr);


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


        if (args.destructor)
                ((ch2_args_destructor_t)args.destructor)(sess, &args);

        free((char *)args.msg);
        free((char *)args.encoding);
        free((char *)args.language);

        aim_freetlvchain(&list2);

        return ret;
}

static int incomingim_ch4(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, fu16_t channel, aim_userinfo_t *userinfo, aim_tlvlist_t *tlvlist, fu8_t *cookie)
{
        aim_bstream_t meat;
        aim_rxcallback_t userfunc;
        aim_tlv_t *block;
        struct aim_incomingim_ch4_args args;
        int ret = 0;

        /*
         * Make a bstream for the meaty part.  Yum.  Meat.
         */
        if (!(block = aim_gettlv(tlvlist, 0x0005, 1)))
                return -1;
        aim_bstream_init(&meat, block->value, block->length);

        args.uin = aimbs_getle32(&meat);
        args.type = aimbs_getle8(&meat);
        args.flags = aimbs_getle8(&meat);
        args.msglen = aimbs_getle16(&meat);
        args.msg = aimbs_getraw(&meat, args.msglen);

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

        free(args.msg);

        return ret;
}

/*
 * Subtype 0x0007
 *
 * It can easily be said that parsing ICBMs is THE single
 * most difficult thing to do in the in AIM protocol.  In
 * fact, I think I just did say that.
 *
 * Below is the best damned solution I've come up with
 * over the past sixteen months of battling with it. This
 * can parse both away and normal messages from every client
 * I have access to.  Its not fast, its not clean.  But it works.
 *
 */
static int incomingim(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        int i, ret = 0;
        fu8_t cookie[8];
        fu16_t channel;
        aim_userinfo_t userinfo;

        memset(&userinfo, 0x00, sizeof(aim_userinfo_t));

        /*
         * Read ICBM Cookie.  And throw away.
         */
        for (i = 0; i < 8; i++)
                cookie[i] = aimbs_get8(bs);

        /*
         * Channel ID.
         *
         * Channel 0x0001 is the message channel.  It is 
         * used to send basic ICBMs.
         *
         * Channel 0x0002 is the Rendevous channel, which
         * is where Chat Invitiations and various client-client
         * connection negotiations come from.
         *
         * Channel 0x0003 is used for chat messages.
         *
         * Channel 0x0004 is used for ICQ authorization, or 
         * possibly any system notice.
         *
         */
        channel = aimbs_get16(bs);

        /*
         * Extract the standard user info block.
         *
         * Note that although this contains TLVs that appear contiguous
         * with the TLVs read below, they are two different pieces.  The
         * userinfo block contains the number of TLVs that contain user
         * information, the rest are not even though there is no seperation.
         * You can start reading the message TLVs after aim_info_extract() 
         * parses out the standard userinfo block.
         *
         * That also means that TLV types can be duplicated between the
         * userinfo block and the rest of the message, however there should
         * never be two TLVs of the same type in one block.
         * 
         */
        aim_info_extract(sess, bs, &userinfo);

        /*
         * From here on, its depends on what channel we're on.
         *
         * Technically all channels have a TLV list have this, however,
         * for the common channel 1 case, in-place parsing is used for
         * performance reasons (less memory allocation).
         */
        if (channel == 1) {

                ret = incomingim_ch1(sess, mod, rx, snac, channel, &userinfo, bs, cookie);

        } else if (channel == 2) {
                aim_tlvlist_t *tlvlist;

                /*
                 * Read block of TLVs (not including the userinfo data).  All 
                 * further data is derived from what is parsed here.
                 */
                tlvlist = aim_readtlvchain(bs);

                ret = incomingim_ch2(sess, mod, rx, snac, channel, &userinfo, tlvlist, cookie);

                aim_freetlvchain(&tlvlist);

        } else if (channel == 4) {
                aim_tlvlist_t *tlvlist;

                tlvlist = aim_readtlvchain(bs);
                ret = incomingim_ch4(sess, mod, rx, snac, channel, &userinfo, tlvlist, cookie);
                aim_freetlvchain(&tlvlist);

        } else {
                faimdprintf(sess, 0, "icbm: ICBM received on an unsupported channel.  Ignoring.  (chan = %04x)\n", channel);
        }

        aim_info_free(&userinfo);

        return ret;
}

/*
 * Subtype 0x0008 - Send a warning to sn.
 * 
 * Flags:
 *  AIM_WARN_ANON  Send as an anonymous (doesn't count as much)
 *
 * returns -1 on error (couldn't alloc packet), 0 on success. 
 *
 */
faim_export int aim_im_warn(aim_session_t *sess, aim_conn_t *conn, const char *sn, fu32_t flags)
{
        aim_frame_t *fr;
        aim_snacid_t snacid;

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

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, strlen(sn)+13)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0008, 0x0000, sn, strlen(sn)+1);
        aim_putsnac(&fr->data, 0x0004, 0x0008, 0x0000, snacid);

        aimbs_put16(&fr->data, (flags & AIM_WARN_ANON) ? 0x0001 : 0x0000); 
        aimbs_put8(&fr->data, strlen(sn));
        aimbs_putraw(&fr->data, sn, strlen(sn));

        aim_tx_enqueue(sess, fr);

        return 0;
}

/* Subtype 0x000a */
static int missedcall(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;
        fu16_t channel, nummissed, reason;
        aim_userinfo_t userinfo;

        while (aim_bstream_empty(bs)) { 

                channel = aimbs_get16(bs);
                aim_info_extract(sess, bs, &userinfo);
                nummissed = aimbs_get16(bs);
                reason = aimbs_get16(bs);

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

                aim_info_free(&userinfo);
        }

        return ret;
}

/*
 * Subtype 0x000b
 *
 * Possible codes:
 *    AIM_TRANSFER_DENY_NOTSUPPORTED -- "client does not support"
 *    AIM_TRANSFER_DENY_DECLINE -- "client has declined transfer"
 *    AIM_TRANSFER_DENY_NOTACCEPTING -- "client is not accepting transfers"
 * 
 */
faim_export int aim_im_denytransfer(aim_session_t *sess, const char *sender, const char *cookie, fu16_t code)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;
        aim_tlvlist_t *tl = NULL;
        
        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0004)))
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10+8+2+1+strlen(sender)+6)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x000b, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x000b, 0x0000, snacid);
        
        aimbs_putraw(&fr->data, cookie, 8);

        aimbs_put16(&fr->data, 0x0002); /* channel */
        aimbs_put8(&fr->data, strlen(sender));
        aimbs_putraw(&fr->data, sender, strlen(sender));

        aim_addtlvtochain16(&tl, 0x0003, code);
        aim_writetlvchain(&fr->data, &tl);
        aim_freetlvchain(&tl);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/*
 * Subtype 0x000b - Receive the response from an ICQ status message request.
 *
 * This contains the ICQ status message.  Go figure.
 *
 */
static int clientautoresp(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;
        fu16_t channel, reason;
        char *sn;
        fu8_t *ck, snlen;

        ck = aimbs_getraw(bs, 8);
        channel = aimbs_get16(bs);
        snlen = aimbs_get8(bs);
        sn = aimbs_getstr(bs, snlen);
        reason = aimbs_get16(bs);

        if (channel == 0x0002) { /* File transfer declined */
                aimbs_get16(bs); /* Unknown */
                aimbs_get16(bs); /* Unknown */
                if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype)))
                        ret = userfunc(sess, rx, channel, sn, reason, ck);
        } else if (channel == 0x0004) { /* ICQ message */
                switch (reason) {
                        case 0x0003: { /* ICQ status message.  Maybe other stuff too, you never know with these people. */
                                fu8_t statusmsgtype, *msg;
                                fu16_t len;
                                fu32_t state;

                                len = aimbs_getle16(bs); /* Should be 0x001b */
                                aim_bstream_advance(bs, len); /* Unknown */

                                len = aimbs_getle16(bs); /* Should be 0x000e */
                                aim_bstream_advance(bs, len); /* Unknown */

                                statusmsgtype = aimbs_getle8(bs);
                                switch (statusmsgtype) {
                                        case 0xe8:
                                                state = AIM_ICQ_STATE_AWAY;
                                                break;
                                        case 0xe9:
                                                state = AIM_ICQ_STATE_AWAY | AIM_ICQ_STATE_BUSY;
                                                break;
                                        case 0xea:
                                                state = AIM_ICQ_STATE_AWAY | AIM_ICQ_STATE_OUT;
                                                break;
                                        case 0xeb:
                                                state = AIM_ICQ_STATE_AWAY | AIM_ICQ_STATE_DND | AIM_ICQ_STATE_BUSY;
                                                break;
                                        case 0xec:
                                                state = AIM_ICQ_STATE_CHAT;
                                                break;
                                        default:
                                                state = 0;
                                                break;
                                }

                                aimbs_getle8(bs); /* Unknown - 0x03 Maybe this means this is an auto-reply */
                                aimbs_getle16(bs); /* Unknown - 0x0000 */
                                aimbs_getle16(bs); /* Unknown - 0x0000 */

                                len = aimbs_getle16(bs);
                                msg = aimbs_getraw(bs, len);

                                if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype)))
                                        ret = userfunc(sess, rx, channel, sn, reason, state, msg);

                                free(msg);
                        } break;

                        default: {
                                if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype)))
                                        ret = userfunc(sess, rx, channel, sn, reason);
                        } break;
                } /* end switch */
        }

        free(ck);
        free(sn);

        return ret;
}

/*
 * Subtype 0x000c - Receive an ack after sending an ICBM.
 *
 * You have to have send the message with the AIM_IMFLAGS_ACK flag set 
 * (TLV t(0003)).  The ack contains the ICBM header of the message you 
 * sent.
 *
 */
static int msgack(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
        aim_rxcallback_t userfunc;
        fu16_t ch;
        fu8_t *ck;
        char *sn;
        int ret = 0;

        ck = aimbs_getraw(bs, 8);
        ch = aimbs_get16(bs);
        sn = aimbs_getstr(bs, aimbs_get8(bs));

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

        free(sn);
        free(ck);

        return ret;
}

/*
 * Subtype 0x0014 - Send a mini typing notification (mtn) packet.
 *
 * This is supported by winaim5 and newer, MacAIM bleh and newer, iChat bleh and newer, 
 * and Gaim 0.60 and newer.
 *
 */
faim_export int aim_im_sendmtn(aim_session_t *sess, fu16_t type1, const char *sn, fu16_t type2)
{
        aim_conn_t *conn;
        aim_frame_t *fr;
        aim_snacid_t snacid;

        if (!sess || !(conn = aim_conn_findbygroup(sess, 0x0002)))
                return -EINVAL;

        if (!sn)
                return -EINVAL;

        if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10+11+strlen(sn)+2)))
                return -ENOMEM;

        snacid = aim_cachesnac(sess, 0x0004, 0x0014, 0x0000, NULL, 0);
        aim_putsnac(&fr->data, 0x0004, 0x0014, 0x0000, snacid);

        /*
         * 8 days of light
         * Er, that is to say, 8 bytes of 0's
         */
        aimbs_put16(&fr->data, 0x0000);
        aimbs_put16(&fr->data, 0x0000);
        aimbs_put16(&fr->data, 0x0000);
        aimbs_put16(&fr->data, 0x0000);

        /*
         * Type 1 (should be 0x0001 for mtn)
         */
        aimbs_put16(&fr->data, type1);

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

        /*
         * Type 2 (should be 0x0000, 0x0001, or 0x0002 for mtn)
         */
        aimbs_put16(&fr->data, type2);

        aim_tx_enqueue(sess, fr);

        return 0;
}

/*
 * Subtype 0x0014 - Receive a mini typing notification (mtn) packet.
 *
 * This is supported by winaim5 and newer, MacAIM bleh and newer, iChat bleh and newer, 
 * and Gaim 0.60 and newer.
 *
 */
static int mtn_receive(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;
        char *sn;
        fu8_t snlen;
        fu16_t type1, type2;

        aim_bstream_advance(bs, 8); /* Unknown - All 0's */
        type1 = aimbs_get16(bs);
        snlen = aimbs_get8(bs);
        sn = aimbs_getstr(bs, snlen);
        type2 = aimbs_get16(bs);

        if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype)))
                ret = userfunc(sess, rx, type1, sn, type2);

        free(sn);

        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 == 0x0005)
                return aim_im_paraminfo(sess, mod, rx, snac, bs);
        else if (snac->subtype == 0x0006)
                return outgoingim(sess, mod, rx, snac, bs);
        else if (snac->subtype == 0x0007)
                return incomingim(sess, mod, rx, snac, bs);
        else if (snac->subtype == 0x000a)
                return missedcall(sess, mod, rx, snac, bs);
        else if (snac->subtype == 0x000b)
                return clientautoresp(sess, mod, rx, snac, bs);
        else if (snac->subtype == 0x000c)
                return msgack(sess, mod, rx, snac, bs);
        else if (snac->subtype == 0x0014)
                return mtn_receive(sess, mod, rx, snac, bs);

        return 0;
}

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

        mod->family = 0x0004;
        mod->version = 0x0001;
        mod->toolid = 0x0110;
        mod->toolversion = 0x0629;
        mod->flags = 0;
        strncpy(mod->name, "messaging", sizeof(mod->name));
        mod->snachandler = snachandler;

        return 0;
}