Initial repository (0.99 release tree)0.99

1 files changed, 408 insertions, 0 deletions

diff --git a/protocols/oscar/rxhandlers.c b/protocols/oscar/rxhandlers.c
new file mode 100644
index 00000000..eb0898ec
--- /dev/null
+++ b/protocols/oscar/rxhandlers.c
@@ -0,0 +1,408 @@
+/*
+ * aim_rxhandlers.c
+ *
+ * This file contains most all of the incoming packet handlers, along
+ * with aim_rxdispatch(), the Rx dispatcher.  Queue/list management is
+ * actually done in aim_rxqueue.c.
+ *
+ */
+
+#include <aim.h>
+
+struct aim_rxcblist_s {
+	guint16 family;
+	guint16 type;
+	aim_rxcallback_t handler;
+	u_short flags;
+	struct aim_rxcblist_s *next;
+};
+
+aim_module_t *aim__findmodulebygroup(aim_session_t *sess, guint16 group)
+{
+	aim_module_t *cur;
+
+	for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) {
+		if (cur->family == group)
+			return cur;
+	}
+
+	return NULL;
+}
+
+static aim_module_t *aim__findmodule(aim_session_t *sess, const char *name)
+{
+	aim_module_t *cur;
+
+	for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) {
+		if (strcmp(name, cur->name) == 0)
+			return cur;
+	}
+
+	return NULL;
+}
+
+int aim__registermodule(aim_session_t *sess, int (*modfirst)(aim_session_t *, aim_module_t *))
+{
+	aim_module_t *mod;
+
+	if (!sess || !modfirst)
+		return -1;
+
+	if (!(mod = g_new0(aim_module_t,1)))
+		return -1;
+
+	if (modfirst(sess, mod) == -1) {
+		g_free(mod);
+		return -1;
+	}
+
+	if (aim__findmodule(sess, mod->name)) {
+		if (mod->shutdown)
+			mod->shutdown(sess, mod);
+		g_free(mod);
+		return -1;
+	}
+
+	mod->next = (aim_module_t *)sess->modlistv;
+	sess->modlistv = mod;
+
+
+	return 0;
+}
+
+void aim__shutdownmodules(aim_session_t *sess)
+{
+	aim_module_t *cur;
+
+	for (cur = (aim_module_t *)sess->modlistv; cur; ) {
+		aim_module_t *tmp;
+
+		tmp = cur->next;
+
+		if (cur->shutdown)
+			cur->shutdown(sess, cur);
+
+		g_free(cur);
+
+		cur = tmp;
+	}
+
+	sess->modlistv = NULL;
+
+	return;
+}
+
+static int consumesnac(aim_session_t *sess, aim_frame_t *rx)
+{
+	aim_module_t *cur;
+	aim_modsnac_t snac;
+
+	if (aim_bstream_empty(&rx->data) < 10)
+		return 0;
+
+	snac.family = aimbs_get16(&rx->data);
+	snac.subtype = aimbs_get16(&rx->data);
+	snac.flags = aimbs_get16(&rx->data);
+	snac.id = aimbs_get32(&rx->data);
+
+	/* Contains TLV(s) in the FNAC header */
+	if(snac.flags & 0x8000) {
+		aim_bstream_advance(&rx->data, aimbs_get16(&rx->data));
+	} else if(snac.flags & 0x0001) {
+		/* Following SNAC will be related */
+	}
+
+    if (set_getint(sess->aux_data, "debug")) {
+        serv_got_crap(sess->aux_data, "snac %x/%x received", snac.family, snac.subtype);
+    }
+
+	for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) {
+
+		if (!(cur->flags & AIM_MODFLAG_MULTIFAMILY) && 
+				(cur->family != snac.family))
+			continue;
+
+		if (cur->snachandler(sess, cur, rx, &snac, &rx->data))
+			return 1;
+
+	}
+
+	return 0;
+}
+
+static int consumenonsnac(aim_session_t *sess, aim_frame_t *rx, guint16 family, guint16 subtype)
+{
+	aim_module_t *cur;
+	aim_modsnac_t snac;
+
+	snac.family = family;
+	snac.subtype = subtype;
+	snac.flags = snac.id = 0;
+
+	for (cur = (aim_module_t *)sess->modlistv; cur; cur = cur->next) {
+
+		if (!(cur->flags & AIM_MODFLAG_MULTIFAMILY) && 
+				(cur->family != snac.family))
+			continue;
+
+		if (cur->snachandler(sess, cur, rx, &snac, &rx->data))
+			return 1;
+
+	}
+
+	return 0;
+}
+
+static int negchan_middle(aim_session_t *sess, aim_frame_t *fr)
+{
+	aim_tlvlist_t *tlvlist;
+	char *msg = NULL;
+	guint16 code = 0;
+	aim_rxcallback_t userfunc;
+	int ret = 1;
+
+	if (aim_bstream_empty(&fr->data) == 0) {
+		/* XXX should do something with this */
+		return 1;
+	}
+
+	/* Used only by the older login protocol */
+	/* XXX remove this special case? */
+	if (fr->conn->type == AIM_CONN_TYPE_AUTH)
+		return consumenonsnac(sess, fr, 0x0017, 0x0003);
+
+	tlvlist = aim_readtlvchain(&fr->data);
+
+	if (aim_gettlv(tlvlist, 0x0009, 1))
+		code = aim_gettlv16(tlvlist, 0x0009, 1);
+
+	if (aim_gettlv(tlvlist, 0x000b, 1))
+		msg = aim_gettlv_str(tlvlist, 0x000b, 1);
+
+	if ((userfunc = aim_callhandler(sess, fr->conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_CONNERR))) 
+		ret = userfunc(sess, fr, code, msg);
+
+	aim_freetlvchain(&tlvlist);
+
+	g_free(msg);
+
+	return ret;
+}
+
+/*
+ * Some SNACs we do not allow to be hooked, for good reason.
+ */
+static int checkdisallowed(guint16 group, guint16 type)
+{
+	static const struct {
+		guint16 group;
+		guint16 type;
+	} dontuse[] = {
+		{0x0001, 0x0002},
+		{0x0001, 0x0003},
+		{0x0001, 0x0006},
+		{0x0001, 0x0007},
+		{0x0001, 0x0008},
+		{0x0001, 0x0017},
+		{0x0001, 0x0018},
+		{0x0000, 0x0000}
+	};
+	int i;
+
+	for (i = 0; dontuse[i].group != 0x0000; i++) {
+		if ((dontuse[i].group == group) && (dontuse[i].type == type))
+			return 1;
+	}
+
+	return 0;
+}
+
+int aim_conn_addhandler(aim_session_t *sess, aim_conn_t *conn, guint16 family, guint16 type, aim_rxcallback_t newhandler, guint16 flags)
+{
+	struct aim_rxcblist_s *newcb;
+
+	if (!conn)
+		return -1;
+
+	if (checkdisallowed(family, type)) {
+		g_assert(0);
+		return -1;
+	}
+
+	if (!(newcb = (struct aim_rxcblist_s *)g_new0(struct aim_rxcblist_s, 1)))
+		return -1;
+
+	newcb->family = family;
+	newcb->type = type;
+	newcb->flags = flags;
+	newcb->handler = newhandler;
+	newcb->next = NULL;
+
+	if (!conn->handlerlist)
+		conn->handlerlist = (void *)newcb;
+	else {
+		struct aim_rxcblist_s *cur;
+
+		for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur->next; cur = cur->next)
+			;
+		cur->next = newcb;
+	}
+
+	return 0;
+}
+
+int aim_clearhandlers(aim_conn_t *conn)
+{
+	struct aim_rxcblist_s *cur;
+
+	if (!conn)
+		return -1;
+
+	for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur; ) {
+		struct aim_rxcblist_s *tmp;
+
+		tmp = cur->next;
+		g_free(cur);
+		cur = tmp;
+	}
+	conn->handlerlist = NULL;
+
+	return 0;
+}
+
+aim_rxcallback_t aim_callhandler(aim_session_t *sess, aim_conn_t *conn, guint16 family, guint16 type)
+{
+	struct aim_rxcblist_s *cur;
+
+	if (!conn)
+		return NULL;
+
+	for (cur = (struct aim_rxcblist_s *)conn->handlerlist; cur; cur = cur->next) {
+		if ((cur->family == family) && (cur->type == type))
+			return cur->handler;
+	}
+
+	if (type == AIM_CB_SPECIAL_DEFAULT) {
+		return NULL; /* prevent infinite recursion */
+	}
+
+	return aim_callhandler(sess, conn, family, AIM_CB_SPECIAL_DEFAULT);
+}
+
+void aim_clonehandlers(aim_session_t *sess, aim_conn_t *dest, aim_conn_t *src)
+{
+	struct aim_rxcblist_s *cur;
+
+	for (cur = (struct aim_rxcblist_s *)src->handlerlist; cur; cur = cur->next) {
+		aim_conn_addhandler(sess, dest, cur->family, cur->type, 
+						cur->handler, cur->flags);
+	}
+
+	return;
+}
+
+static int aim_callhandler_noparam(aim_session_t *sess, aim_conn_t *conn,guint16 family, guint16 type, aim_frame_t *ptr)
+{
+	aim_rxcallback_t userfunc;
+
+	if ((userfunc = aim_callhandler(sess, conn, family, type)))
+		return userfunc(sess, ptr);
+
+	return 1; /* XXX */
+}
+
+/*
+ * aim_rxdispatch()
+ *
+ * Basically, heres what this should do:
+ *   1) Determine correct packet handler for this packet
+ *   2) Mark the packet handled (so it can be dequeued in purge_queue())
+ *   3) Send the packet to the packet handler
+ *   4) Go to next packet in the queue and start over
+ *   5) When done, run purge_queue() to purge handled commands
+ *
+ * TODO: Clean up.
+ * TODO: More support for mid-level handlers.
+ * TODO: Allow for NULL handlers.
+ *
+ */
+void aim_rxdispatch(aim_session_t *sess)
+{
+	int i;
+	aim_frame_t *cur;
+
+	for (cur = sess->queue_incoming, i = 0; cur; cur = cur->next, i++) {
+
+		/*
+		 * XXX: This is still fairly ugly.
+		 */
+
+		if (cur->handled)
+			continue;
+
+		/*
+		 * This is a debugging/sanity check only and probably 
+		 * could/should be removed for stable code.
+		 */
+		if (((cur->hdrtype == AIM_FRAMETYPE_OFT) && 
+		   (cur->conn->type != AIM_CONN_TYPE_RENDEZVOUS)) || 
+		  ((cur->hdrtype == AIM_FRAMETYPE_FLAP) && 
+		   (cur->conn->type == AIM_CONN_TYPE_RENDEZVOUS))) {
+			do_error_dialog(sess->aux_data, "incompatible frame type/connection type combination", "Gaim");
+			cur->handled = 1;
+			continue;
+		}
+
+		if (cur->conn->type == AIM_CONN_TYPE_RENDEZVOUS) {
+			if (cur->hdrtype != AIM_FRAMETYPE_OFT) {
+				do_error_dialog(sess->aux_data, "non-OFT frames on OFT connection", "Gaim");
+				cur->handled = 1; /* get rid of it */
+			} else {
+				/* FIXME: implement this (OFT frame) */
+				cur->handled = 1; /* get rid of it */
+			}
+			continue;
+		}
+
+		if (cur->conn->type == AIM_CONN_TYPE_RENDEZVOUS_OUT) {
+			/* not possible */
+			do_error_dialog(sess->aux_data, "RENDEZVOUS packet in rxqueue", "Gaim");
+			cur->handled = 1;
+			continue;
+		}
+
+		if (cur->hdr.flap.type == 0x01) {
+			
+			cur->handled = aim_callhandler_noparam(sess, cur->conn, AIM_CB_FAM_SPECIAL, AIM_CB_SPECIAL_FLAPVER, cur); /* XXX use consumenonsnac */
+			
+			continue;
+			
+		} else if (cur->hdr.flap.type == 0x02) {
+
+			if ((cur->handled = consumesnac(sess, cur)))
+				continue;
+
+		} else if (cur->hdr.flap.type == 0x04) {
+
+			cur->handled = negchan_middle(sess, cur);
+			continue;
+
+		} else if (cur->hdr.flap.type == 0x05)
+			;
+		
+		if (!cur->handled) {
+			consumenonsnac(sess, cur, 0xffff, 0xffff); /* last chance! */
+			cur->handled = 1;
+		}
+	}
+
+	/* 
+	 * This doesn't have to be called here.  It could easily be done
+	 * by a seperate thread or something. It's an administrative operation,
+	 * and can take a while. Though the less you call it the less memory
+	 * you'll have :)
+	 */
+	aim_purge_rxqueue(sess);
+
+	return;
+}