1 files changed, 508 insertions, 0 deletions
diff --git a/protocols/oscar/rxqueue.c b/protocols/oscar/rxqueue.c
new file mode 100644
index 00000000..d95bc026
--- /dev/null
+++ b/protocols/oscar/rxqueue.c
@@ -0,0 +1,508 @@
+/*
+ *  aim_rxqueue.c
+ *
+ * This file contains the management routines for the receive
+ * (incoming packet) queue.  The actual packet handlers are in
+ * aim_rxhandlers.c.
+ */
+
+#include <aim.h> 
+
+#ifndef _WIN32
+#include <sys/socket.h>
+#endif
+
+/*
+ *
+ */
+int aim_recv(int fd, void *buf, size_t count)
+{
+	int left, cur; 
+
+	for (cur = 0, left = count; left; ) {
+		int ret;
+		
+		ret = recv(fd, ((unsigned char *)buf)+cur, left, 0);
+
+		/* Of course EOF is an error, only morons disagree with that. */
+		if (ret <= 0)
+			return -1;
+
+		cur += ret;
+		left -= ret;
+	}
+
+	return cur;
+}
+
+/*
+ * Read into a byte stream.  Will not read more than count, but may read
+ * less if there is not enough room in the stream buffer.
+ */
+static int aim_bstream_recv(aim_bstream_t *bs, int fd, size_t count)
+{
+	int red = 0;
+
+	if (!bs || (fd < 0) || (count < 0))
+		return -1;
+	
+	if (count > (bs->len - bs->offset))
+		count = bs->len - bs->offset; /* truncate to remaining space */
+
+	if (count) {
+
+		red = aim_recv(fd, bs->data + bs->offset, count);
+
+		if (red <= 0)
+			return -1;
+	}
+
+	bs->offset += red;
+
+	return red;
+}
+
+int aim_bstream_init(aim_bstream_t *bs, guint8 *data, int len)
+{
+	
+	if (!bs)
+		return -1;
+
+	bs->data = data;
+	bs->len = len;
+	bs->offset = 0;
+
+	return 0;
+}
+
+int aim_bstream_empty(aim_bstream_t *bs)
+{
+	return bs->len - bs->offset;
+}
+
+int aim_bstream_curpos(aim_bstream_t *bs)
+{
+	return bs->offset;
+}
+
+int aim_bstream_setpos(aim_bstream_t *bs, int off)
+{
+
+	if (off > bs->len)
+		return -1;
+
+	bs->offset = off;
+
+	return off;
+}
+
+void aim_bstream_rewind(aim_bstream_t *bs)
+{
+
+	aim_bstream_setpos(bs, 0);
+
+	return;
+}
+
+int aim_bstream_advance(aim_bstream_t *bs, int n)
+{
+
+	if (aim_bstream_empty(bs) < n)
+		return 0; /* XXX throw an exception */
+
+	bs->offset += n;
+
+	return n;
+}
+
+guint8 aimbs_get8(aim_bstream_t *bs)
+{
+	
+	if (aim_bstream_empty(bs) < 1)
+		return 0; /* XXX throw an exception */
+	
+	bs->offset++;
+	
+	return aimutil_get8(bs->data + bs->offset - 1);
+}
+
+guint16 aimbs_get16(aim_bstream_t *bs)
+{
+	
+	if (aim_bstream_empty(bs) < 2)
+		return 0; /* XXX throw an exception */
+	
+	bs->offset += 2;
+	
+	return aimutil_get16(bs->data + bs->offset - 2);
+}
+
+guint32 aimbs_get32(aim_bstream_t *bs)
+{
+	
+	if (aim_bstream_empty(bs) < 4)
+		return 0; /* XXX throw an exception */
+	
+	bs->offset += 4;
+	
+	return aimutil_get32(bs->data + bs->offset - 4);
+}
+
+guint8 aimbs_getle8(aim_bstream_t *bs)
+{
+	
+	if (aim_bstream_empty(bs) < 1)
+		return 0; /* XXX throw an exception */
+	
+	bs->offset++;
+	
+	return aimutil_getle8(bs->data + bs->offset - 1);
+}
+
+guint16 aimbs_getle16(aim_bstream_t *bs)
+{
+	
+	if (aim_bstream_empty(bs) < 2)
+		return 0; /* XXX throw an exception */
+	
+	bs->offset += 2;
+	
+	return aimutil_getle16(bs->data + bs->offset - 2);
+}
+
+guint32 aimbs_getle32(aim_bstream_t *bs)
+{
+	
+	if (aim_bstream_empty(bs) < 4)
+		return 0; /* XXX throw an exception */
+	
+	bs->offset += 4;
+	
+	return aimutil_getle32(bs->data + bs->offset - 4);
+}
+
+int aimbs_put8(aim_bstream_t *bs, guint8 v)
+{
+
+	if (aim_bstream_empty(bs) < 1)
+		return 0; /* XXX throw an exception */
+
+	bs->offset += aimutil_put8(bs->data + bs->offset, v);
+
+	return 1;
+}
+
+int aimbs_put16(aim_bstream_t *bs, guint16 v)
+{
+
+	if (aim_bstream_empty(bs) < 2)
+		return 0; /* XXX throw an exception */
+
+	bs->offset += aimutil_put16(bs->data + bs->offset, v);
+
+	return 2;
+}
+
+int aimbs_put32(aim_bstream_t *bs, guint32 v)
+{
+
+	if (aim_bstream_empty(bs) < 4)
+		return 0; /* XXX throw an exception */
+
+	bs->offset += aimutil_put32(bs->data + bs->offset, v);
+
+	return 1;
+}
+
+int aimbs_putle8(aim_bstream_t *bs, guint8 v)
+{
+
+	if (aim_bstream_empty(bs) < 1)
+		return 0; /* XXX throw an exception */
+
+	bs->offset += aimutil_putle8(bs->data + bs->offset, v);
+
+	return 1;
+}
+
+int aimbs_putle16(aim_bstream_t *bs, guint16 v)
+{
+
+	if (aim_bstream_empty(bs) < 2)
+		return 0; /* XXX throw an exception */
+
+	bs->offset += aimutil_putle16(bs->data + bs->offset, v);
+
+	return 2;
+}
+
+int aimbs_putle32(aim_bstream_t *bs, guint32 v)
+{
+
+	if (aim_bstream_empty(bs) < 4)
+		return 0; /* XXX throw an exception */
+
+	bs->offset += aimutil_putle32(bs->data + bs->offset, v);
+
+	return 1;
+}
+
+int aimbs_getrawbuf(aim_bstream_t *bs, guint8 *buf, int len)
+{
+
+	if (aim_bstream_empty(bs) < len)
+		return 0;
+
+	memcpy(buf, bs->data + bs->offset, len);
+	bs->offset += len;
+
+	return len;
+}
+
+guint8 *aimbs_getraw(aim_bstream_t *bs, int len)
+{
+	guint8 *ob;
+
+	if (!(ob = g_malloc(len)))
+		return NULL;
+
+	if (aimbs_getrawbuf(bs, ob, len) < len) {
+		g_free(ob);
+		return NULL;
+	}
+
+	return ob;
+}
+
+char *aimbs_getstr(aim_bstream_t *bs, int len)
+{
+	guint8 *ob;
+
+	if (!(ob = g_malloc(len+1)))
+		return NULL;
+
+	if (aimbs_getrawbuf(bs, ob, len) < len) {
+		g_free(ob);
+		return NULL;
+	}
+	
+	ob[len] = '\0';
+
+	return (char *)ob;
+}
+
+int aimbs_putraw(aim_bstream_t *bs, const guint8 *v, int len)
+{
+
+	if (aim_bstream_empty(bs) < len)
+		return 0; /* XXX throw an exception */
+
+	memcpy(bs->data + bs->offset, v, len);
+	bs->offset += len;
+
+	return len;
+}
+
+int aimbs_putbs(aim_bstream_t *bs, aim_bstream_t *srcbs, int len)
+{
+
+	if (aim_bstream_empty(srcbs) < len)
+		return 0; /* XXX throw exception (underrun) */
+
+	if (aim_bstream_empty(bs) < len)
+		return 0; /* XXX throw exception (overflow) */
+
+	memcpy(bs->data + bs->offset, srcbs->data + srcbs->offset, len);
+	bs->offset += len;
+	srcbs->offset += len;
+
+	return len;
+}
+
+/**
+ * aim_frame_destroy - free aim_frame_t 
+ * @frame: the frame to free  
+ *
+ * returns -1 on error; 0 on success.  
+ *
+ */
+void aim_frame_destroy(aim_frame_t *frame)
+{
+
+	g_free(frame->data.data); /* XXX aim_bstream_free */
+
+	if (frame->hdrtype == AIM_FRAMETYPE_OFT)
+		g_free(frame->hdr.oft.hdr2);
+	g_free(frame);
+	
+	return;
+} 
+
+
+/*
+ * Grab a single command sequence off the socket, and enqueue
+ * it in the incoming event queue in a seperate struct.
+ */
+int aim_get_command(aim_session_t *sess, aim_conn_t *conn)
+{
+	guint8 flaphdr_raw[6];
+	aim_bstream_t flaphdr;
+	aim_frame_t *newrx;
+	guint16 payloadlen;
+	
+	if (!sess || !conn)
+		return 0;
+
+	if (conn->fd == -1)
+		return -1; /* its a aim_conn_close()'d connection */
+
+	if (conn->fd < 3)  /* can happen when people abuse the interface */
+		return 0;
+
+	if (conn->status & AIM_CONN_STATUS_INPROGRESS)
+		return aim_conn_completeconnect(sess, conn);
+
+	/*
+	 * Rendezvous (client-client) connections do not speak
+	 * FLAP, so this function will break on them.
+	 */
+	if (conn->type == AIM_CONN_TYPE_RENDEZVOUS) 
+		return aim_get_command_rendezvous(sess, conn);
+	else if (conn->type == AIM_CONN_TYPE_RENDEZVOUS_OUT) {
+		do_error_dialog(sess->aux_data,"AIM_CONN_TYPE_RENDEZVOUS_OUT shouldn't use FLAP", "Gaim");
+		return 0; 
+	}
+
+	aim_bstream_init(&flaphdr, flaphdr_raw, sizeof(flaphdr_raw));
+
+	/*
+	 * Read FLAP header.  Six bytes:
+	 *    
+	 *   0 char  -- Always 0x2a
+	 *   1 char  -- Channel ID.  Usually 2 -- 1 and 4 are used during login.
+	 *   2 short -- Sequence number 
+	 *   4 short -- Number of data bytes that follow.
+	 */
+	if (aim_bstream_recv(&flaphdr, conn->fd, 6) < 6) {
+		aim_conn_close(conn);
+		return -1;
+	}
+
+	aim_bstream_rewind(&flaphdr);
+
+	/*
+	 * This shouldn't happen unless the socket breaks, the server breaks,
+	 * or we break.  We must handle it just in case.
+	 */
+	if (aimbs_get8(&flaphdr) != 0x2a) {
+		guint8 start;
+
+		aim_bstream_rewind(&flaphdr);
+		start = aimbs_get8(&flaphdr);
+		do_error_dialog(sess->aux_data, "FLAP framing disrupted", "Gaim");
+		aim_conn_close(conn);
+		return -1;
+	}	
+
+	/* allocate a new struct */
+	if (!(newrx = (aim_frame_t *)g_new0(aim_frame_t,1)))
+		return -1;
+
+	/* we're doing FLAP if we're here */
+	newrx->hdrtype = AIM_FRAMETYPE_FLAP;
+	
+	newrx->hdr.flap.type = aimbs_get8(&flaphdr);
+	newrx->hdr.flap.seqnum = aimbs_get16(&flaphdr);
+	payloadlen = aimbs_get16(&flaphdr);
+
+	newrx->nofree = 0; /* free by default */
+
+	if (payloadlen) {
+		guint8 *payload = NULL;
+
+		if (!(payload = (guint8 *) g_malloc(payloadlen))) {
+			aim_frame_destroy(newrx);
+			return -1;
+		}
+
+		aim_bstream_init(&newrx->data, payload, payloadlen);
+
+		/* read the payload */
+		if (aim_bstream_recv(&newrx->data, conn->fd, payloadlen) < payloadlen) {
+			aim_frame_destroy(newrx); /* free's payload */
+			aim_conn_close(conn);
+			return -1;
+		}
+	} else
+		aim_bstream_init(&newrx->data, NULL, 0);
+
+
+	aim_bstream_rewind(&newrx->data);
+
+	newrx->conn = conn;
+
+	newrx->next = NULL;  /* this will always be at the bottom */
+
+	if (!sess->queue_incoming)
+		sess->queue_incoming = newrx;
+	else {
+		aim_frame_t *cur;
+
+		for (cur = sess->queue_incoming; cur->next; cur = cur->next)
+			;
+		cur->next = newrx;
+	}
+
+	newrx->conn->lastactivity = time(NULL);
+
+	return 0;  
+}
+
+/*
+ * Purge recieve queue of all handled commands (->handled==1).  Also
+ * allows for selective freeing using ->nofree so that the client can
+ * keep the data for various purposes.  
+ *
+ * If ->nofree is nonzero, the frame will be delinked from the global list, 
+ * but will not be free'ed.  The client _must_ keep a pointer to the
+ * data -- libfaim will not!  If the client marks ->nofree but
+ * does not keep a pointer, it's lost forever.
+ *
+ */
+void aim_purge_rxqueue(aim_session_t *sess)
+{
+	aim_frame_t *cur, **prev;
+
+	for (prev = &sess->queue_incoming; (cur = *prev); ) {
+		if (cur->handled) {
+
+			*prev = cur->next;
+			
+			if (!cur->nofree)
+				aim_frame_destroy(cur);
+
+		} else
+			prev = &cur->next;
+	}
+
+	return;
+}
+
+/*
+ * Since aim_get_command will aim_conn_kill dead connections, we need
+ * to clean up the rxqueue of unprocessed connections on that socket.
+ *
+ * XXX: this is something that was handled better in the old connection
+ * handling method, but eh.
+ */
+void aim_rxqueue_cleanbyconn(aim_session_t *sess, aim_conn_t *conn)
+{
+	aim_frame_t *currx;
+
+	for (currx = sess->queue_incoming; currx; currx = currx->next) {
+		if ((!currx->handled) && (currx->conn == conn))
+			currx->handled = 1;
+	}	
+	return;
+}
+