family_icbm.c

Linux下的多协议即时通讯程序源代码

	aim_tlvlist_free(inner_tlvlist);
	aim_tlvlist_free(outer_tlvlist);

	flap_connection_send(conn, frame);
}

/**
 * Subtype 0x0006 - Send an "I want to send you this file" message
 *
 */
void
aim_im_sendch2_sendfile_requestdirect(OscarData *od, guchar *cookie, const char *sn, const guint8 *ip, guint16 port, guint16 requestnumber, const gchar *filename, guint32 size, guint16 numfiles)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;
	GSList *outer_tlvlist = NULL, *inner_tlvlist = NULL;
	ByteStream hdrbs;

	conn = flap_connection_findbygroup(od, 0x0004);
	if (conn == NULL)
		return;

	frame = flap_frame_new(od, 0x02, 1024);

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

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

	aim_tlvlist_add_noval(&outer_tlvlist, 0x0003);

	byte_stream_new(&hdrbs, 512);

	byte_stream_put16(&hdrbs, AIM_RENDEZVOUS_PROPOSE);
	byte_stream_putraw(&hdrbs, cookie, 8);
	byte_stream_putcaps(&hdrbs, OSCAR_CAPABILITY_SENDFILE);

	aim_tlvlist_add_raw(&inner_tlvlist, 0x0002, 4, ip);
	aim_tlvlist_add_raw(&inner_tlvlist, 0x0003, 4, ip);
	aim_tlvlist_add_16(&inner_tlvlist, 0x0005, port);
	aim_tlvlist_add_16(&inner_tlvlist, 0x000a, requestnumber);
	aim_tlvlist_add_noval(&inner_tlvlist, 0x000f);
	/* TODO: Send 0x0016 and 0x0017 */

#if 0
	/* TODO: If the following is ever enabled, ensure that it is
	 *       not sent with a receive redirect or stage 3 proxy
	 *       redirect for a file receive (same conditions for
	 *       sending 0x000f above)
	 */
	aim_tlvlist_add_raw(&inner_tlvlist, 0x000e, 2, "en");
	aim_tlvlist_add_raw(&inner_tlvlist, 0x000d, 8, "us-ascii");
	aim_tlvlist_add_raw(&inner_tlvlist, 0x000c, 24, "Please accept this file.");
#endif

	if (filename != NULL)
	{
		ByteStream bs;

		/* Begin TLV t(2711) */
		byte_stream_new(&bs, 2+2+4+strlen(filename)+1);
		byte_stream_put16(&bs, (numfiles > 1) ? 0x0002 : 0x0001);
		byte_stream_put16(&bs, numfiles);
		byte_stream_put32(&bs, size);

		/* Filename - NULL terminated, for some odd reason */
		byte_stream_putstr(&bs, filename);
		byte_stream_put8(&bs, 0x00);

		aim_tlvlist_add_raw(&inner_tlvlist, 0x2711, bs.len, bs.data);
		g_free(bs.data);
		/* End TLV t(2711) */
	}

	aim_tlvlist_write(&hdrbs, &inner_tlvlist);
	aim_tlvlist_add_raw(&outer_tlvlist, 0x0005, byte_stream_curpos(&hdrbs), hdrbs.data);
	g_free(hdrbs.data);

	aim_tlvlist_write(&frame->data, &outer_tlvlist);

	aim_tlvlist_free(inner_tlvlist);
	aim_tlvlist_free(outer_tlvlist);

	flap_connection_send(conn, frame);
}

/**
 * Subtype 0x0006 - Send a sendfile connect rendezvous ICBM asking the
 * remote user to connect to us via a proxy server.
 */
void
aim_im_sendch2_sendfile_requestproxy(OscarData *od, guchar *cookie, const char *sn, const guint8 *ip, guint16 pin, guint16 requestnumber, const gchar *filename, guint32 size, guint16 numfiles)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;
	GSList *outer_tlvlist = NULL, *inner_tlvlist = NULL;
	ByteStream hdrbs;
	guint8 ip_comp[4];

	conn = flap_connection_findbygroup(od, 0x0004);
	if (conn == NULL)
		return;

	frame = flap_frame_new(od, 0x02, 1024);

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

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

	aim_tlvlist_add_noval(&outer_tlvlist, 0x0003);

	byte_stream_new(&hdrbs, 512);

	byte_stream_put16(&hdrbs, AIM_RENDEZVOUS_PROPOSE);
	byte_stream_putraw(&hdrbs, cookie, 8);
	byte_stream_putcaps(&hdrbs, OSCAR_CAPABILITY_SENDFILE);

	aim_tlvlist_add_raw(&inner_tlvlist, 0x0002, 4, ip);
	aim_tlvlist_add_raw(&inner_tlvlist, 0x0003, 4, ip);
	aim_tlvlist_add_16(&inner_tlvlist, 0x0005, pin);
	aim_tlvlist_add_16(&inner_tlvlist, 0x000a, requestnumber);
	aim_tlvlist_add_noval(&inner_tlvlist, 0x000f);
	aim_tlvlist_add_noval(&inner_tlvlist, 0x0010);

	/* Send the bitwise complement of the port and ip.  As a check? */
	ip_comp[0] = ~ip[0];
	ip_comp[1] = ~ip[1];
	ip_comp[2] = ~ip[2];
	ip_comp[3] = ~ip[3];
	aim_tlvlist_add_raw(&inner_tlvlist, 0x0016, 4, ip_comp);
	aim_tlvlist_add_16(&inner_tlvlist, 0x0017, ~pin);

#if 0
	/* TODO: If the following is ever enabled, ensure that it is
	 *       not sent with a receive redirect or stage 3 proxy
	 *       redirect for a file receive (same conditions for
	 *       sending 0x000f above)
	 */
	aim_tlvlist_add_raw(&inner_tlvlist, 0x000e, 2, "en");
	aim_tlvlist_add_raw(&inner_tlvlist, 0x000d, 8, "us-ascii");
	aim_tlvlist_add_raw(&inner_tlvlist, 0x000c, 24, "Please accept this file.");
#endif

	if (filename != NULL)
	{
		ByteStream bs;

		/* Begin TLV t(2711) */
		byte_stream_new(&bs, 2+2+4+strlen(filename)+1);
		byte_stream_put16(&bs, (numfiles > 1) ? 0x0002 : 0x0001);
		byte_stream_put16(&bs, numfiles);
		byte_stream_put32(&bs, size);

		/* Filename - NULL terminated, for some odd reason */
		byte_stream_putstr(&bs, filename);
		byte_stream_put8(&bs, 0x00);

		aim_tlvlist_add_raw(&inner_tlvlist, 0x2711, bs.len, bs.data);
		g_free(bs.data);
		/* End TLV t(2711) */
	}

	aim_tlvlist_write(&hdrbs, &inner_tlvlist);

	aim_tlvlist_add_raw(&outer_tlvlist, 0x0005, byte_stream_curpos(&hdrbs), hdrbs.data);
	g_free(hdrbs.data);

	aim_tlvlist_write(&frame->data, &outer_tlvlist);

	aim_tlvlist_free(inner_tlvlist);
	aim_tlvlist_free(outer_tlvlist);

	flap_connection_send(conn, frame);
}

/**
 * Subtype 0x0006 - Request the status message of the given ICQ user.
 *
 * @param od 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.
 */
int aim_im_sendch2_geticqaway(OscarData *od, const char *sn, int type)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;
	guchar cookie[8];

	if (!od || !(conn = flap_connection_findbygroup(od, 0x0004)) || !sn)
		return -EINVAL;

	aim_icbm_makecookie(cookie);

	frame = flap_frame_new(od, 0x02, 10+8+2+1+strlen(sn) + 4+0x5e + 4);

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

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

	/* TLV t(0005) - Encompasses almost everything below. */
	byte_stream_put16(&frame->data, 0x0005); /* T */
	byte_stream_put16(&frame->data, 0x005e); /* L */
	{ /* V */
		byte_stream_put16(&frame->data, 0x0000);

		/* Cookie */
		byte_stream_putraw(&frame->data, cookie, 8);

		/* Put the 16 byte server relay capability */
		byte_stream_putcaps(&frame->data, OSCAR_CAPABILITY_ICQSERVERRELAY);

		/* TLV t(000a) */
		byte_stream_put16(&frame->data, 0x000a);
		byte_stream_put16(&frame->data, 0x0002);
		byte_stream_put16(&frame->data, 0x0001);

		/* TLV t(000f) */
		byte_stream_put16(&frame->data, 0x000f);
		byte_stream_put16(&frame->data, 0x0000);

		/* TLV t(2711) */
		byte_stream_put16(&frame->data, 0x2711);
		byte_stream_put16(&frame->data, 0x0036);
		{ /* V */
			byte_stream_putle16(&frame->data, 0x001b); /* L */
			byte_stream_putle16(&frame->data, 0x0009); /* Protocol version */
			byte_stream_putcaps(&frame->data, OSCAR_CAPABILITY_EMPTY);
			byte_stream_putle16(&frame->data, 0x0000); /* Unknown */
			byte_stream_putle16(&frame->data, 0x0001); /* Client features? */
			byte_stream_putle16(&frame->data, 0x0000); /* Unknown */
			byte_stream_putle8(&frame->data, 0x00); /* Unkizown */
			byte_stream_putle16(&frame->data, 0xffff); /* Sequence number?  XXX - This should decrement by 1 with each request */

			byte_stream_putle16(&frame->data, 0x000e); /* L */
			byte_stream_putle16(&frame->data, 0xffff); /* Sequence number?  XXX - This should decrement by 1 with each request */
			byte_stream_putle32(&frame->data, 0x00000000); /* Unknown */
			byte_stream_putle32(&frame->data, 0x00000000); /* Unknown */
			byte_stream_putle32(&frame->data, 0x00000000); /* Unknown */

			/* The type of status message being requested */
			if (type & AIM_ICQ_STATE_CHAT)
				byte_stream_putle16(&frame->data, 0x03ec);
			else if(type & AIM_ICQ_STATE_DND)
				byte_stream_putle16(&frame->data, 0x03eb);
			else if(type & AIM_ICQ_STATE_OUT)
				byte_stream_putle16(&frame->data, 0x03ea);
			else if(type & AIM_ICQ_STATE_BUSY)
				byte_stream_putle16(&frame->data, 0x03e9);
			else if(type & AIM_ICQ_STATE_AWAY)
				byte_stream_putle16(&frame->data, 0x03e8);

			byte_stream_putle16(&frame->data, 0x0001); /* Status? */
			byte_stream_putle16(&frame->data, 0x0001); /* Priority of this message? */
			byte_stream_putle16(&frame->data, 0x0001); /* L */
			byte_stream_putle8(&frame->data, 0x00); /* String of length L */
		} /* End TLV t(2711) */
	} /* End TLV t(0005) */

	/* TLV t(0003) */
	byte_stream_put16(&frame->data, 0x0003);
	byte_stream_put16(&frame->data, 0x0000);

	flap_connection_send(conn, frame);

	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.
 */
int aim_im_sendch4(OscarData *od, const char *sn, guint16 type, const char *message)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;
	guchar cookie[8];

	if (!od || !(conn = flap_connection_findbygroup(od, 0x0002)))
		return -EINVAL;

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

	frame = flap_frame_new(od, 0x02, 10+8+3+strlen(sn)+12+strlen(message)+1+4);

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

	aim_icbm_makecookie(cookie);

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

	/*
	 * TLV t(0005)
	 *
	 * ICQ data (the UIN and the message).
	 */
	byte_stream_put16(&frame->data, 0x0005);
	byte_stream_put16(&frame->data, 4 + 2+2+strlen(message)+1);

	/*
	 * Your UIN
	 */
	byte_stream_putle32(&frame->data, atoi(od->sn));

	/*
	 * TLV t(type) l(strlen(message)+1) v(message+NULL)
	 */
	byte_stream_putle16(&frame->data, type);
	byte_stream_putle16(&frame->data, strlen(message)+1);
	byte_stream_putraw(&frame->data, (const guint8 *)message, strlen(message)+1);

	/*
	 * TLV t(0006) l(0000) v()
	 */
	byte_stream_put16(&frame->data, 0x0006);
	byte_stream_put16(&frame->data, 0x0000);

	flap_connection_send(conn, frame);

	return 0;
}

/*
 * XXX - I don't see when this would ever get called...
 */
static int outgoingim(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guchar cookie[8];
	guint16 channel;
	GSList *tlvlist;
	char *sn;
	int snlen;
	guint16 icbmflags = 0;
	guint8 flag1 = 0, flag2 = 0;
	gchar *msg = NULL;
	aim_tlv_t *msgblock;

	/* ICBM Cookie. */
	aim_icbm_makecookie(cookie);

	/* Channel ID */
	channel = byte_stream_get16(bs);

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

	snlen = byte_stream_get8(bs);
	sn = byte_stream_getstr(bs, snlen);

	tlvlist = aim_tlvlist_read(bs);

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

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

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

		byte_stream_get8(&mbs);
		byte_stream_get8(&mbs);
		for (featurelen = byte_stream_get16(&mbs); featurelen; featurelen--)
			byte_stream_get8(&mbs);
		byte_stream_get8(&mbs);
		byte_stream_get8(&mbs);

		msglen = byte_stream_get16(&mbs) - 4; /* final block length */

		flag1 = byte_stream_get16(&mbs);
		flag2 = byte_stream_get16(&mbs);

		msg = byte_stream_getstr(&mbs, msglen);
	}

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

	g_free(sn);
	g_free(msg);
	aim_tlvlist_free(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