- markus@cvs.openbsd.org 2008/05/08 06:59:01

[bufaux.c buffer.h channels.c packet.c packet.h]
     avoid extra malloc/copy/free when receiving data over the net;
     ~10% speedup for localhost-scp; ok djm@

ChangeLog

@@ -58,6 +58,10 @@
    - jmc@cvs.openbsd.org 2008/05/07 08:00:14
      [sshd_config.5]
      sort;
+   - markus@cvs.openbsd.org 2008/05/08 06:59:01
+     [bufaux.c buffer.h channels.c packet.c packet.h]
+     avoid extra malloc/copy/free when receiving data over the net;
+     ~10% speedup for localhost-scp; ok djm@
 
 20080403
  - (djm) [openbsd-compat/bsd-poll.c] Include stdlib.h to avoid compile-
@@ -3918,4 +3922,4 @@
    OpenServer 6 and add osr5bigcrypt support so when someone migrates
    passwords between UnixWare and OpenServer they will still work. OK dtucker@
 
-$Id: ChangeLog,v 1.4918 2008/05/19 04:59:02 djm Exp $
+$Id: ChangeLog,v 1.4919 2008/05/19 04:59:37 djm Exp $

bufaux.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: bufaux.c,v 1.44 2006/08/03 03:34:41 deraadt Exp $ */
+/* $OpenBSD: bufaux.c,v 1.45 2008/05/08 06:59:01 markus Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -197,6 +197,22 @@ buffer_get_string(Buffer *buffer, u_int *length_ptr)
 	return (ret);
 }
 
+void *
+buffer_get_string_ptr(Buffer *buffer, u_int *length_ptr)
+{
+	void *ptr;
+	u_int len;
+
+	len = buffer_get_int(buffer);
+	if (len > 256 * 1024)
+		fatal("buffer_get_string_ptr: bad string length %u", len);
+	ptr = buffer_ptr(buffer);
+	buffer_consume(buffer, len);
+	if (length_ptr)
+		*length_ptr = len;
+	return (ptr);
+}
+
 /*
  * Stores and arbitrary binary string in the buffer.
  */

buffer.h

@@ -1,4 +1,4 @@
-/* $OpenBSD: buffer.h,v 1.16 2006/08/03 03:34:41 deraadt Exp $ */
+/* $OpenBSD: buffer.h,v 1.17 2008/05/08 06:59:01 markus Exp $ */
 
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -66,6 +66,7 @@ int     buffer_get_char(Buffer *);
 void    buffer_put_char(Buffer *, int);
 
 void   *buffer_get_string(Buffer *, u_int *);
+void   *buffer_get_string_ptr(Buffer *, u_int *);
 void    buffer_put_string(Buffer *, const void *, u_int);
 void	buffer_put_cstring(Buffer *, const char *);
 

channels.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: channels.c,v 1.273 2008/04/02 21:36:51 markus Exp $ */
+/* $OpenBSD: channels.c,v 1.274 2008/05/08 06:59:01 markus Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -2012,7 +2012,7 @@ channel_input_data(int type, u_int32_t seq, void *ctxt)
 		return;
 
 	/* Get the data. */
-	data = packet_get_string(&data_len);
+	data = packet_get_string_ptr(&data_len);
 
 	/*
 	 * Ignore data for protocol > 1.3 if output end is no longer open.
@@ -2026,7 +2026,6 @@ channel_input_data(int type, u_int32_t seq, void *ctxt)
 			c->local_window -= data_len;
 			c->local_consumed += data_len;
 		}
-		xfree(data);
 		return;
 	}
 
@@ -2038,17 +2037,15 @@ channel_input_data(int type, u_int32_t seq, void *ctxt)
 		if (data_len > c->local_window) {
 			logit("channel %d: rcvd too much data %d, win %d",
 			    c->self, data_len, c->local_window);
-			xfree(data);
 			return;
 		}
 		c->local_window -= data_len;
 	}
-	packet_check_eom();
 	if (c->datagram)
 		buffer_put_string(&c->output, data, data_len);
 	else
 		buffer_append(&c->output, data, data_len);
-	xfree(data);
+	packet_check_eom();
 }
 
 /* ARGSUSED */

packet.c

@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.c,v 1.151 2008/02/22 20:44:02 dtucker Exp $ */
+/* $OpenBSD: packet.c,v 1.152 2008/05/08 06:59:01 markus Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -1332,6 +1332,12 @@ packet_get_string(u_int *length_ptr)
 	return buffer_get_string(&incoming_packet, length_ptr);
 }
 
+void *
+packet_get_string_ptr(u_int *length_ptr)
+{
+	return buffer_get_string_ptr(&incoming_packet, length_ptr);
+}
+
 /*
  * Sends a diagnostic message from the server to the client.  This message
  * can be sent at any time (but not while constructing another message). The

packet.h

@@ -1,4 +1,4 @@
-/* $OpenBSD: packet.h,v 1.46 2008/02/22 20:44:02 dtucker Exp $ */
+/* $OpenBSD: packet.h,v 1.47 2008/05/08 06:59:01 markus Exp $ */
 
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -58,6 +58,7 @@ void     packet_get_bignum(BIGNUM * value);
 void     packet_get_bignum2(BIGNUM * value);
 void	*packet_get_raw(u_int *length_ptr);
 void	*packet_get_string(u_int *length_ptr);
+void	*packet_get_string_ptr(u_int *length_ptr);
 void     packet_disconnect(const char *fmt,...) __attribute__((format(printf, 1, 2)));
 void     packet_send_debug(const char *fmt,...) __attribute__((format(printf, 1, 2)));