family_oservice.c

Linux下的多协议即时通讯程序源代码

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

		if ((mod = aim__findmodulebygroup(od, GPOINTER_TO_UINT(cur->data))))
		{
			byte_stream_put16(&frame->data, mod->family);
			byte_stream_put16(&frame->data, mod->version);
		}
	}

	flap_connection_send(conn, frame);
}

/* Subtype 0x0018 - Host versions */
static int
hostversions(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int vercount;
	guint8 *versions;

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

	/*
	 * Now request rates.
	 */
	aim_srv_reqrates(od, conn);

	return 1;
}

/**
 * Subtype 0x001e - Extended Status/Extra Info.
 *
 * These settings are transient, not server-stored (i.e. they only
 * apply to this session, and must be re-set the next time you sign
 * on).
 *
 * You can set your ICQ status (available, away, do not disturb,
 * etc.), or whether your IP address should be hidden or not, or
 * if your status is visible on ICQ web sites, and you can set
 * your IP address info and what not.
 *
 * You can also set your "available" message.  This is currently
 * only supported by iChat, Purple and other 3rd party clients.
 *
 * These are the same TLVs seen in user info.  You can
 * also set 0x0008 and 0x000c.
 */
int
aim_srv_setextrainfo(OscarData *od,
		gboolean seticqstatus, guint32 icqstatus,
		gboolean setavailmsg, const char *availmsg, const char *itmsurl)
{
	FlapConnection *conn;
	FlapFrame *frame;
	aim_snacid_t snacid;
	GSList *tlvlist = NULL;

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

	if (seticqstatus)
	{
		aim_tlvlist_add_32(&tlvlist, 0x0006, icqstatus |
				AIM_ICQ_STATE_HIDEIP | AIM_ICQ_STATE_DIRECTREQUIREAUTH);
	}

#if 0
	if (other_stuff_that_isnt_implemented)
	{
		aim_tlvlist_add_raw(&tlvlist, 0x000c, 0x0025,
				chunk_of_x25_bytes_with_ip_address_etc);
		aim_tlvlist_add_raw(&tlvlist, 0x0011, 0x0005, unknown 0x01 61 10 f6 41);
		aim_tlvlist_add_16(&tlvlist, 0x0012, unknown 0x00 00);
	}
#endif

	if (setavailmsg)
	{
		int availmsglen, itmsurllen;
		ByteStream tmpbs;

		availmsglen = (availmsg != NULL) ? strlen(availmsg) : 0;
		itmsurllen = (itmsurl != NULL) ? strlen(itmsurl) : 0;

		byte_stream_new(&tmpbs, availmsglen + 8 + itmsurllen + 8);
		byte_stream_put16(&tmpbs, 0x0002);
		byte_stream_put8(&tmpbs, 0x04); /* Flags */
		byte_stream_put8(&tmpbs, availmsglen + 4);
		byte_stream_put16(&tmpbs, availmsglen);
		if (availmsglen > 0)
			byte_stream_putstr(&tmpbs, availmsg);
		byte_stream_put16(&tmpbs, 0x0000);

		byte_stream_put16(&tmpbs, 0x0009);
		byte_stream_put8(&tmpbs, 0x04); /* Flags */
		byte_stream_put8(&tmpbs, itmsurllen + 4);
		byte_stream_put16(&tmpbs, itmsurllen);
		if (itmsurllen > 0)
			byte_stream_putstr(&tmpbs, itmsurl);
		byte_stream_put16(&tmpbs, 0x0000);

		aim_tlvlist_add_raw(&tlvlist, 0x001d,
				byte_stream_curpos(&tmpbs), tmpbs.data);
		g_free(tmpbs.data);
	}

	frame = flap_frame_new(od, 0x02, 10 + aim_tlvlist_size(tlvlist));

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

	aim_tlvlist_write(&frame->data, &tlvlist);
	aim_tlvlist_free(tlvlist);

	flap_connection_send(conn, frame);

	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 immediatly 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 ocassions.
 *
 * Anyway, neener.  We win again.
 *
 */
/* Subtype 0x001f - Client verification */
static int
memrequest(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guint32 offset, len;
	GSList *tlvlist;
	char *modname;

	offset = byte_stream_get32(bs);
	len = byte_stream_get32(bs);
	tlvlist = aim_tlvlist_read(bs);

	modname = aim_tlv_getstr(tlvlist, 0x0001, 1);

	purple_debug_info("oscar", "Got memory request for data at 0x%08lx (%d bytes) of requested %s\n", offset, len, modname ? modname : "aim.exe");

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype)))
		ret = userfunc(od, conn, frame, offset, len, modname);

	g_free(modname);
	aim_tlvlist_free(tlvlist);

	return ret;
}

/* Subtype 0x0020 - Client verification reply */
int
aim_sendmemblock(OscarData *od, FlapConnection *conn, guint32 offset, guint32 len, const guint8 *buf, guint8 flag)
{
	FlapFrame *frame;
	aim_snacid_t snacid;

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

	frame = flap_frame_new(od, 0x02, 10+2+16);

	snacid = aim_cachesnac(od, 0x0001, 0x0020, 0x0000, NULL, 0);

	aim_putsnac(&frame->data, 0x0001, 0x0020, 0x0000, snacid);
	byte_stream_put16(&frame->data, 0x0010); /* md5 is always 16 bytes */

	if ((flag == AIM_SENDMEMBLOCK_FLAG_ISHASH) && buf && (len == 0x10)) { /* we're getting a hash */

		byte_stream_putraw(&frame->data, buf, 0x10);

	} else if (buf && (len > 0)) { /* use input buffer */
		PurpleCipher *cipher;
		PurpleCipherContext *context;
		guchar digest[16];

		cipher = purple_ciphers_find_cipher("md5");

		context = purple_cipher_context_new(cipher, NULL);
		purple_cipher_context_append(context, buf, len);
		purple_cipher_context_digest(context, 16, digest, NULL);
		purple_cipher_context_destroy(context);

		byte_stream_putraw(&frame->data, digest, 0x10);

	} else if (len == 0) { /* no length, just hash NULL (buf is optional) */
		PurpleCipher *cipher;
		PurpleCipherContext *context;
		guchar digest[16];
		guint8 nil = '\0';

		/*
		 * I'm not sure if we really need the empty append with the
		 * new MD5 functions, so I'll leave it in, just in case.
		 */
		cipher = purple_ciphers_find_cipher("md5");

		context = purple_cipher_context_new(cipher, NULL);
		purple_cipher_context_append(context, &nil, 0);
		purple_cipher_context_digest(context, 16, digest, NULL);
		purple_cipher_context_destroy(context);

		byte_stream_putraw(&frame->data, digest, 0x10);

	} else {

		/*
		 * This data is correct for AIM 3.5.1670.
		 *
		 * Using these blocks is as close to "legal" as you can get
		 * without using an AIM binary.
		 *
		 */
		if ((offset == 0x03ffffff) && (len == 0x03ffffff)) {

#if 1 /* with "AnrbnrAqhfzcd" */
			byte_stream_put32(&frame->data, 0x44a95d26);
			byte_stream_put32(&frame->data, 0xd2490423);
			byte_stream_put32(&frame->data, 0x93b8821f);
			byte_stream_put32(&frame->data, 0x51c54b01);
#else /* no filename */
			byte_stream_put32(&frame->data, 0x1df8cbae);
			byte_stream_put32(&frame->data, 0x5523b839);
			byte_stream_put32(&frame->data, 0xa0e10db3);
			byte_stream_put32(&frame->data, 0xa46d3b39);
#endif

		} else
			purple_debug_warning("oscar", "sendmemblock: unknown hash request\n");

	}

	flap_connection_send(conn, frame);

	return 0;
}

/*
 * Subtype 0x0021 - Receive our extended status
 *
 * This is used for iChat's "available" messages, and maybe ICQ extended
 * status messages?  It's also used to tell the client whether or not it
 * needs to upload an SSI buddy icon... who engineers this stuff, anyway?
 */
static int
aim_parse_extstatus(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	int ret = 0;
	aim_rxcallback_t userfunc;
	guint16 type;
	guint8 flags, length;

	type = byte_stream_get16(bs);
	flags = byte_stream_get8(bs);
	length = byte_stream_get8(bs);

	/*
	 * A flag of 0x01 could mean "this is the checksum we have for you"
	 * A flag of 0x40 could mean "I don't have your icon, upload it"
	 */

	if ((userfunc = aim_callhandler(od, snac->family, snac->subtype))) {
		switch (type) {
		case 0x0000:
		case 0x0001: { /* buddy icon checksum */
			/* not sure what the difference between 1 and 0 is */
			guint8 *md5 = byte_stream_getraw(bs, length);
			ret = userfunc(od, conn, frame, type, flags, length, md5);
			g_free(md5);
			} break;
		case 0x0002: { /* available message */
			/* there is a second length that is just for the message */
			char *msg = byte_stream_getstr(bs, byte_stream_get16(bs));
			ret = userfunc(od, conn, frame, msg);
			g_free(msg);
			} break;
		}
	}

	return ret;
}

static int
snachandler(OscarData *od, FlapConnection *conn, aim_module_t *mod, FlapFrame *frame, aim_modsnac_t *snac, ByteStream *bs)
{
	if (snac->subtype == 0x0003)
		return hostonline(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x0005)
		return redirect(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x0007)
		return rateresp(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x000a)
		return ratechange(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x000b)
		return serverpause(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x000d)
		return serverresume(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x000f)
		return selfinfo(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x0010)
		return evilnotify(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x0012)
		return migrate(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x0013)
		return motd(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x0018)
		return hostversions(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x001f)
		return memrequest(od, conn, mod, frame, snac, bs);
	else if (snac->subtype == 0x0021)
		return aim_parse_extstatus(od, conn, mod, frame, snac, bs);

	return 0;
}

int service_modfirst(OscarData *od, aim_module_t *mod)
{
	mod->family = 0x0001;
	mod->version = 0x0003;
	mod->toolid = 0x0110;
	mod->toolversion = 0x0629;
	mod->flags = 0;
	strncpy(mod->name, "oservice", sizeof(mod->name));
	mod->snachandler = snachandler;

	return 0;
}