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.\" BitlBee is free software; you can redistribute it and/or modify
.\" it under the terms of the GNU General Public License as published by
.\" the Free Software Foundation; either version 2 of the License, or
.\" (at your option) any later version.
.\"
.\" This program is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public License
.\" along with this program; see the file COPYING.  If not, write to
.\" the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
.\"
.TH bitlbee 8 "07 March 2004"
.SH NAME
BitlBee \- IRC gateway to IM chat networks
.SH SYNOPSIS
.PP
.B bitlbee
[-I]
[-c \fIconfiguration file\fP]
[-d \fIconfiguration directory\fP]
.PP
.B bitlbee
-D
[-i \fIaddress\fP]
[-p \fIport number\fP]
[-n]
[-v]
[-c \fIconfiguration file\fP]
[-d \fIconfiguration directory\fP]
.PP
.B bitlbee
-h
.RI
.SH DESCRIPTION
BitlBee is an IRC daemon that can talk to instant messaging 
networks and acts as a gateway. Users can connect to the server
with any normal IRC client and see their 'buddy list' in
&bitlbee. It currently supports Oscar (AIM and ICQ),
MSN, Jabber, Yahoo! and Twitter.

\fBbitlbee\fP should be called by
.BR inetd (8),
or you can run it as a stand-alone daemon.
.PP
.SH OPTIONS
.PP
.IP "-I"
Run in 
.BR inetd (8)
mode. This is the default setting, you usually don't have to specify this
option.
.IP "-D"
Run in daemon mode. In this mode, BitlBee forks to the background and
waits for new connections. All clients will be served from one process.
.IP "-F"
Run in ForkDaemon mode. This is similar to ordinary daemon mode, but every
client gets its own process. Easier to set up than inetd mode, and without
the possible stability issues.
.IP "-i \fIaddress\fP"
Only useful when running in daemon mode, to specify the network interface
(identified by IP address) to which the daemon should attach. Use this if
you don't want BitlBee to listen on every interface (which is the default
behaviour).
.IP "-p \fIport number\fP"
Only useful when running in daemon mode, to specify the port number on
which BitlBee should listen for connections. 6667 is the default value.
.IP "-n"
Only useful when running in daemon mode. This option prevents BitlBee from
forking into the background.
.IP "-v"
Be more verbose. This only works together with the \fB-n\fP flag.
.IP "-c \fIpath to other configuration file\fP"
Use a different configuration file.
.IP "-d \fIpath to user settings directory\fP"
BitlBee normally saves every user's settings in \fB/var/lib/bitlbee/\fP. If
you want the settings to be stored somewhere else (for example, if you don't
have write permissions in the default location), use this option.
.IP "-h"
Show help information.
.SH COMMANDS
To get a complete list of commands, please use the \fBhelp commands\fP
command in the &bitlbee channel.
.SH "SEE ALSO"
.BR ircd (8), 
.BR inetd (8), 
.BR inetd.conf (5), 
.BR gaim (1).

.BR http://www.bitlbee.org/

For more information on using BitlBee, once connected, you should use
the on-line help system.
.SH BUGS
Of course there are bugs. If you find some, please report them at
\fBhttp://bugs.bitlbee.org/\fP.
.SH LICENSE
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
.PP
This program is distributed in the hope that it will be useful, but
\fBWITHOUT ANY WARRANTY\fR; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
General Public License for more details.
.PP
You should have received a copy of the GNU General Public License 
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple PLace, Suite 330, Boston, MA  02111-1307  USA
.SH AUTHORS
.PP
 Wilmer van der Gaast <wilmer@gaast.net>
.BR
 Jelmer Vernooij <jelmer@vernstok.nl>
.BR
 Maurits Dijkstra <mauritsd@xs4all.nl>
n497' href='#n497'>497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806
/*
 * Group 1.  This is a very special group.  All connections support
 * this group, as it does some particularly good things (like rate limiting).
 */

#include <aim.h>

#include "md5.h"

/* Client Online (group 1, subtype 2) */
int aim_clientready(aim_session_t *sess, aim_conn_t *conn)
{
	aim_conn_inside_t *ins = (aim_conn_inside_t *) conn->inside;
	struct snacgroup *sg;
	aim_frame_t *fr;
	aim_snacid_t snacid;

	if (!ins) {
		return -EINVAL;
	}

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

	snacid = aim_cachesnac(sess, 0x0001, 0x0002, 0x0000, NULL, 0);
	aim_putsnac(&fr->data, 0x0001, 0x0002, 0x0000, snacid);

	/*
	 * Send only the tool versions that the server cares about (that it
	 * marked as supporting in the server ready SNAC).
	 */
	for (sg = ins->groups; sg; sg = sg->next) {
		aim_module_t *mod;

		if ((mod = aim__findmodulebygroup(sess, sg->group))) {
			aimbs_put16(&fr->data, mod->family);
			aimbs_put16(&fr->data, mod->version);
			aimbs_put16(&fr->data, mod->toolid);
			aimbs_put16(&fr->data, mod->toolversion);
		}
	}

	aim_tx_enqueue(sess, fr);

	return 0;
}

/*
 * Host Online (group 1, type 3)
 *
 * See comments in conn.c about how the group associations are supposed
 * to work, and how they really work.
 *
 * This info probably doesn't even need to make it to the client.
 *
 * We don't actually call the client here.  This starts off the connection
 * initialization routine required by all AIM connections.  The next time
 * the client is called is the CONNINITDONE callback, which should be
 * shortly after the rate information is acknowledged.
 *
 */
static int hostonline(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	guint16 *families;
	int famcount;


	if (!(families = g_malloc(aim_bstream_empty(bs)))) {
		return 0;
	}

	for (famcount = 0; aim_bstream_empty(bs); famcount++) {
		families[famcount] = aimbs_get16(bs);
		aim_conn_addgroup(rx->conn, families[famcount]);
	}

	g_free(families);


	/*
	 * Next step is in the Host Versions handler.
	 *
	 * Note that we must send this before we request rates, since
	 * the format of the rate information depends on the versions we
	 * give it.
	 *
	 */
	aim_setversions(sess, rx->conn);

	return 1;
}

/* Service request (group 1, type 4) */
int aim_reqservice(aim_session_t *sess, aim_conn_t *conn, guint16 serviceid)
{
	return aim_genericreq_s(sess, conn, 0x0001, 0x0004, &serviceid);
}

/* Redirect (group 1, type 5) */
static int redirect(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	struct aim_redirect_data redir;
	aim_rxcallback_t userfunc;
	aim_tlvlist_t *tlvlist;
	aim_snac_t *origsnac = NULL;
	int ret = 0;

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

	tlvlist = aim_readtlvchain(bs);

	if (!aim_gettlv(tlvlist, 0x000d, 1) ||
	    !aim_gettlv(tlvlist, 0x0005, 1) ||
	    !aim_gettlv(tlvlist, 0x0006, 1)) {
		aim_freetlvchain(&tlvlist);
		return 0;
	}

	redir.group = aim_gettlv16(tlvlist, 0x000d, 1);
	redir.ip = aim_gettlv_str(tlvlist, 0x0005, 1);
	redir.cookie = (guint8 *) aim_gettlv_str(tlvlist, 0x0006, 1);

	/* Fetch original SNAC so we can get csi if needed */
	origsnac = aim_remsnac(sess, snac->id);

	if ((redir.group == AIM_CONN_TYPE_CHAT) && origsnac) {
		struct chatsnacinfo *csi = (struct chatsnacinfo *) origsnac->data;

		redir.chat.exchange = csi->exchange;
		redir.chat.room = csi->name;
		redir.chat.instance = csi->instance;
	}

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

	g_free((void *) redir.ip);
	g_free((void *) redir.cookie);

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

	aim_freetlvchain(&tlvlist);

	return ret;
}

/* Request Rate Information. (group 1, type 6) */
int aim_reqrates(aim_session_t *sess, aim_conn_t *conn)
{
	return aim_genericreq_n(sess, conn, 0x0001, 0x0006);
}

/*
 * OSCAR defines several 'rate classes'.  Each class has separate
 * rate limiting properties (limit level, alert level, disconnect
 * level, etc), and a set of SNAC family/type pairs associated with
 * it.  The rate classes, their limiting properties, and the definitions
 * of which SNACs are belong to which class, are defined in the
 * Rate Response packet at login to each host.
 *
 * Logically, all rate offenses within one class count against further
 * offenses for other SNACs in the same class (ie, sending messages
 * too fast will limit the number of user info requests you can send,
 * since those two SNACs are in the same rate class).
 *
 * Since the rate classes are defined dynamically at login, the values
 * below may change. But they seem to be fairly constant.
 *
 * Currently, BOS defines five rate classes, with the commonly used
 * members as follows...
 *
 *  Rate class 0x0001:
 *      - Everything thats not in any of the other classes
 *
 *  Rate class 0x0002:
 *      - Buddy list add/remove
 *	- Permit list add/remove
 *	- Deny list add/remove
 *
 *  Rate class 0x0003:
 *	- User information requests
 *	- Outgoing ICBMs
 *
 *  Rate class 0x0004:
 *	- A few unknowns: 2/9, 2/b, and f/2
 *
 *  Rate class 0x0005:
 *	- Chat room create
 *	- Outgoing chat ICBMs
 *
 * The only other thing of note is that class 5 (chat) has slightly looser
 * limiting properties than class 3 (normal messages).  But thats just a
 * small bit of trivia for you.
 *
 * The last thing that needs to be learned about the rate limiting
 * system is how the actual numbers relate to the passing of time.  This
 * seems to be a big mystery.
 *
 */

static void rc_addclass(struct rateclass **head, struct rateclass *inrc)
{
	struct rateclass *rc, *rc2;

	if (!(rc = g_malloc(sizeof(struct rateclass)))) {
		return;
	}

	memcpy(rc, inrc, sizeof(struct rateclass));
	rc->next = NULL;

	for (rc2 = *head; rc2 && rc2->next; rc2 = rc2->next) {
		;
	}

	if (!rc2) {
		*head = rc;
	} else {
		rc2->next = rc;
	}

	return;
}

static struct rateclass *rc_findclass(struct rateclass **head, guint16 id)
{
	struct rateclass *rc;

	for (rc = *head; rc; rc = rc->next) {
		if (rc->classid == id) {
			return rc;
		}
	}

	return NULL;
}

static void rc_addpair(struct rateclass *rc, guint16 group, guint16 type)
{
	struct snacpair *sp, *sp2;

	if (!(sp = g_new0(struct snacpair, 1))) {
		return;
	}

	sp->group = group;
	sp->subtype = type;
	sp->next = NULL;

	for (sp2 = rc->members; sp2 && sp2->next; sp2 = sp2->next) {
		;
	}

	if (!sp2) {
		rc->members = sp;
	} else {
		sp2->next = sp;
	}

	return;
}

/* Rate Parameters (group 1, type 7) */
static int rateresp(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_conn_inside_t *ins = (aim_conn_inside_t *) rx->conn->inside;
	guint16 numclasses, i;
	aim_rxcallback_t userfunc;


	/*
	 * First are the parameters for each rate class.
	 */
	numclasses = aimbs_get16(bs);
	for (i = 0; i < numclasses; i++) {
		struct rateclass rc;

		memset(&rc, 0, sizeof(struct rateclass));

		rc.classid = aimbs_get16(bs);
		rc.windowsize = aimbs_get32(bs);
		rc.clear = aimbs_get32(bs);
		rc.alert = aimbs_get32(bs);
		rc.limit = aimbs_get32(bs);
		rc.disconnect = aimbs_get32(bs);
		rc.current = aimbs_get32(bs);
		rc.max = aimbs_get32(bs);

		/*
		 * The server will send an extra five bytes of parameters
		 * depending on the version we advertised in 1/17.  If we
		 * didn't send 1/17 (evil!), then this will crash and you
		 * die, as it will default to the old version but we have
		 * the new version hardcoded here.
		 */
		if (mod->version >= 3) {
			aimbs_getrawbuf(bs, rc.unknown, sizeof(rc.unknown));
		}

		rc_addclass(&ins->rates, &rc);
	}

	/*
	 * Then the members of each class.
	 */
	for (i = 0; i < numclasses; i++) {
		guint16 classid, count;
		struct rateclass *rc;
		int j;

		classid = aimbs_get16(bs);
		count = aimbs_get16(bs);

		rc = rc_findclass(&ins->rates, classid);

		for (j = 0; j < count; j++) {
			guint16 group, subtype;

			group = aimbs_get16(bs);
			subtype = aimbs_get16(bs);

			if (rc) {
				rc_addpair(rc, group, subtype);
			}
		}
	}

	/*
	 * We don't pass the rate information up to the client, as it really
	 * doesn't care.  The information is stored in the connection, however
	 * so that we can do more fun stuff later (not really).
	 */

	/*
	 * Last step in the conn init procedure is to acknowledge that we
	 * agree to these draconian limitations.
	 */
	aim_rates_addparam(sess, rx->conn);

	/*
	 * Finally, tell the client it's ready to go...
	 */
	if ((userfunc = aim_callhandler(sess, rx->conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_CONNINITDONE))) {
		userfunc(sess, rx);
	}


	return 1;
}

/* Add Rate Parameter (group 1, type 8) */
int aim_rates_addparam(aim_session_t *sess, aim_conn_t *conn)
{
	aim_conn_inside_t *ins = (aim_conn_inside_t *) conn->inside;
	aim_frame_t *fr;
	aim_snacid_t snacid;
	struct rateclass *rc;

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

	snacid = aim_cachesnac(sess, 0x0001, 0x0008, 0x0000, NULL, 0);
	aim_putsnac(&fr->data, 0x0001, 0x0008, 0x0000, snacid);

	for (rc = ins->rates; rc; rc = rc->next) {
		aimbs_put16(&fr->data, rc->classid);
	}

	aim_tx_enqueue(sess, fr);

	return 0;
}

/* Rate Change (group 1, type 0x0a) */
static int ratechange(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_rxcallback_t userfunc;
	guint16 code, rateclass;
	guint32 currentavg, maxavg, windowsize, clear, alert, limit, disconnect;

	code = aimbs_get16(bs);
	rateclass = aimbs_get16(bs);

	windowsize = aimbs_get32(bs);
	clear = aimbs_get32(bs);
	alert = aimbs_get32(bs);
	limit = aimbs_get32(bs);
	disconnect = aimbs_get32(bs);
	currentavg = aimbs_get32(bs);
	maxavg = aimbs_get32(bs);

	if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
		return userfunc(sess, rx, code, rateclass, windowsize, clear, alert, limit, disconnect, currentavg,
		                maxavg);
	}

	return 0;
}

/*
 * How Migrations work.
 *
 * The server sends a Server Pause message, which the client should respond to
 * with a Server Pause Ack, which contains the families it needs on this
 * connection. The server will send a Migration Notice with an IP address, and
 * then disconnect. Next the client should open the connection and send the
 * cookie.  Repeat the normal login process and pretend this never happened.
 *
 * The Server Pause contains no data.
 *
 */

/* Service Pause (group 1, type 0x0b) */
static int serverpause(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_rxcallback_t userfunc;

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

	return 0;
}

/* Service Resume (group 1, type 0x0d) */
static int serverresume(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_rxcallback_t userfunc;

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

	return 0;
}

/* Request self-info (group 1, type 0x0e) */
int aim_reqpersonalinfo(aim_session_t *sess, aim_conn_t *conn)
{
	return aim_genericreq_n(sess, conn, 0x0001, 0x000e);
}

/* Self User Info (group 1, type 0x0f) */
static int selfinfo(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_rxcallback_t userfunc;
	aim_userinfo_t userinfo;

	aim_extractuserinfo(sess, bs, &userinfo);

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

	return 0;
}

/* Evil Notification (group 1, type 0x10) */
static int evilnotify(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_rxcallback_t userfunc;
	guint16 newevil;
	aim_userinfo_t userinfo;

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

	newevil = aimbs_get16(bs);

	if (aim_bstream_empty(bs)) {
		aim_extractuserinfo(sess, bs, &userinfo);
	}

	if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
		return userfunc(sess, rx, newevil, &userinfo);
	}

	return 0;
}

/*
 * Service Migrate (group 1, type 0x12)
 *
 * This is the final SNAC sent on the original connection during a migration.
 * It contains the IP and cookie used to connect to the new server, and
 * optionally a list of the SNAC groups being migrated.
 *
 */
static int migrate(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_rxcallback_t userfunc;
	int ret = 0;
	guint16 groupcount, i;
	aim_tlvlist_t *tl;
	char *ip = NULL;
	aim_tlv_t *cktlv;

	/*
	 * Apparently there's some fun stuff that can happen right here. The
	 * migration can actually be quite selective about what groups it
	 * moves to the new server.  When not all the groups for a connection
	 * are migrated, or they are all migrated but some groups are moved
	 * to a different server than others, it is called a bifurcated
	 * migration.
	 *
	 * Let's play dumb and not support that.
	 *
	 */
	groupcount = aimbs_get16(bs);
	for (i = 0; i < groupcount; i++) {
		aimbs_get16(bs);

		imcb_error(sess->aux_data, "bifurcated migration unsupported");
	}

	tl = aim_readtlvchain(bs);

	if (aim_gettlv(tl, 0x0005, 1)) {
		ip = aim_gettlv_str(tl, 0x0005, 1);
	}

	cktlv = aim_gettlv(tl, 0x0006, 1);

	if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
		ret = userfunc(sess, rx, ip, cktlv ? cktlv->value : NULL);
	}

	aim_freetlvchain(&tl);
	g_free(ip);

	return ret;
}

/* Message of the Day (group 1, type 0x13) */
static int motd(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_rxcallback_t userfunc;
	char *msg = NULL;
	int ret = 0;
	aim_tlvlist_t *tlvlist;
	guint16 id;

	/*
	 * Code.
	 *
	 * Valid values:
	 *   1 Mandatory upgrade
	 *   2 Advisory upgrade
	 *   3 System bulletin
	 *   4 Nothing's wrong ("top o the world" -- normal)
	 *   5 Lets-break-something.
	 *
	 */
	id = aimbs_get16(bs);

	/*
	 * TLVs follow
	 */
	tlvlist = aim_readtlvchain(bs);

	msg = aim_gettlv_str(tlvlist, 0x000b, 1);

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

	g_free(msg);

	aim_freetlvchain(&tlvlist);

	return ret;
}

/*
 * Set privacy flags (group 1, type 0x14)
 *
 * Normally 0x03.
 *
 *  Bit 1:  Allows other AIM users to see how long you've been idle.
 *  Bit 2:  Allows other AIM users to see how long you've been a member.
 *
 */
int aim_bos_setprivacyflags(aim_session_t *sess, aim_conn_t *conn, guint32 flags)
{
	return aim_genericreq_l(sess, conn, 0x0001, 0x0014, &flags);
}


/*
 * Set client versions (group 1, subtype 0x17)
 *
 * If you've seen the clientonline/clientready SNAC you're probably
 * wondering what the point of this one is.  And that point seems to be
 * that the versions in the client online SNAC are sent too late for the
 * server to be able to use them to change the protocol for the earlier
 * login packets (client versions are sent right after Host Online is
 * received, but client online versions aren't sent until quite a bit later).
 * We can see them already making use of this by changing the format of
 * the rate information based on what version of group 1 we advertise here.
 *
 */
int aim_setversions(aim_session_t *sess, aim_conn_t *conn)
{
	aim_conn_inside_t *ins = (aim_conn_inside_t *) conn->inside;
	struct snacgroup *sg;
	aim_frame_t *fr;
	aim_snacid_t snacid;

	if (!ins) {
		return -EINVAL;
	}

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

	snacid = aim_cachesnac(sess, 0x0001, 0x0017, 0x0000, NULL, 0);
	aim_putsnac(&fr->data, 0x0001, 0x0017, 0x0000, snacid);

	/*
	 * Send only the versions that the server cares about (that it
	 * marked as supporting in the server ready SNAC).
	 */
	for (sg = ins->groups; sg; sg = sg->next) {
		aim_module_t *mod;

		if ((mod = aim__findmodulebygroup(sess, sg->group))) {
			aimbs_put16(&fr->data, mod->family);
			aimbs_put16(&fr->data, mod->version);
		}
	}

	aim_tx_enqueue(sess, fr);

	return 0;
}

/* Host versions (group 1, subtype 0x18) */
static int hostversions(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	guint8 *versions;

	/* This is frivolous. (Thank you SmarterChild.) */
	aim_bstream_empty(bs); /* == vercount * 4 */
	versions = aimbs_getraw(bs, aim_bstream_empty(bs));
	g_free(versions);

	/*
	 * Now request rates.
	 */
	aim_reqrates(sess, rx->conn);

	return 1;
}

/*
 * Subtype 0x001e - Extended Status
 *
 * Sets your ICQ status (available, away, do not disturb, etc.)
 *
 * These are the same TLVs seen in user info.  You can
 * also set 0x0008 and 0x000c.
 */
int aim_setextstatus(aim_session_t *sess, aim_conn_t *conn, guint32 status)
{
	aim_frame_t *fr;
	aim_snacid_t snacid;
	aim_tlvlist_t *tl = NULL;
	guint32 data;
	struct im_connection *ic = sess ? sess->aux_data : NULL;

	data = AIM_ICQ_STATE_HIDEIP | status; /* yay for error checking ;^) */

	if (ic && set_getbool(&ic->acc->set, "web_aware")) {
		data |= AIM_ICQ_STATE_WEBAWARE;
	}

	aim_addtlvtochain32(&tl, 0x0006, data); /* tlvlen */

	if (!(fr = aim_tx_new(sess, conn, AIM_FRAMETYPE_FLAP, 0x02, 10 + 8))) {
		return -ENOMEM;
	}

	snacid = aim_cachesnac(sess, 0x0001, 0x001e, 0x0000, NULL, 0);
	aim_putsnac(&fr->data, 0x0001, 0x001e, 0x0000, snacid);

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

	aim_tx_enqueue(sess, fr);

	return 0;
}

/*
 * Starting this past week (26 Mar 2001, say), AOL has started sending
 * this nice little extra SNAC.  AFAIK, it has never been used until now.
 *
 * The request contains eight bytes.  The first four are an offset, the
 * second four are a length.
 *
 * The offset is an offset into aim.exe when it is mapped during execution
 * on Win32.  So far, AOL has only been requesting bytes in static regions
 * of memory.  (I won't put it past them to start requesting data in
 * less static regions -- regions that are initialized at run time, but still
 * before the client receives this request.)
 *
 * When the client receives the request, it adds it to the current ds
 * (0x00400000) and dereferences it, copying the data into a buffer which
 * it then runs directly through the MD5 hasher.  The 16 byte output of
 * the hash is then sent back to the server.
 *
 * If the client does not send any data back, or the data does not match
 * the data that the specific client should have, the client will get the
 * following message from "AOL Instant Messenger":
 *    "You have been disconnected from the AOL Instant Message Service (SM)
 *     for accessing the AOL network using unauthorized software.  You can
 *     download a FREE, fully featured, and authorized client, here
 *     http://www.aol.com/aim/download2.html"
 * The connection is then closed, receiving disconnect code 1, URL
 * http://www.aim.aol.com/errors/USER_LOGGED_OFF_NEW_LOGIN.html.
 *
 * Note, however, that numerous inconsistencies can cause the above error,
 * not just sending back a bad hash.  Do not immediately suspect this code
 * if you get disconnected.  AOL and the open/free software community have
 * played this game for a couple years now, generating the above message
 * on numerous occasions.
 *
 * Anyway, neener.  We win again.
 *
 */
/* Client verification (group 1, subtype 0x1f) */
static int memrequest(aim_session_t *sess, aim_module_t *mod, aim_frame_t *rx, aim_modsnac_t *snac, aim_bstream_t *bs)
{
	aim_rxcallback_t userfunc;
	guint32 offset, len;
	aim_tlvlist_t *list;
	char *modname;

	offset = aimbs_get32(bs);
	len = aimbs_get32(bs);
	list = aim_readtlvchain(bs);

	modname = aim_gettlv_str(list, 0x0001, 1);

	if ((userfunc = aim_callhandler(sess, rx->conn, snac->family, snac->subtype))) {
		return userfunc(sess, rx, offset, len, modname);
	}

	g_free(modname);
	aim_freetlvchain(&list);

	return 0;
}

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 == 0x0003) {
		return hostonline(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x0005) {
		return redirect(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x0007) {
		return rateresp(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x000a) {
		return ratechange(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x000b) {
		return serverpause(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x000d) {
		return serverresume(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x000f) {
		return selfinfo(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x0010) {
		return evilnotify(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x0012) {
		return migrate(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x0013) {
		return motd(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x0018) {
		return hostversions(sess, mod, rx, snac, bs);
	} else if (snac->subtype == 0x001f) {
		return memrequest(sess, mod, rx, snac, bs);
	}

	return 0;
}

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

	mod->family = 0x0001;
	mod->version = 0x0003;
	mod->toolid = 0x0110;
	mod->toolversion = 0x0629;
	mod->flags = 0;
	strncpy(mod->name, "general", sizeof(mod->name));
	mod->snachandler = snachandler;

	return 0;
}