blob: fb08df54872301ef4519c4ab244ac6706e3f783d [file] [log] [blame]
Damien Miller3f941882006-03-31 23:13:02 +11001/* $OpenBSD: msg.c,v 1.11 2006/03/30 09:58:15 djm Exp $ */
Ben Lindstroma93f12f2002-06-07 01:51:06 +00002/*
3 * Copyright (c) 2002 Markus Friedl. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25#include "includes.h"
Ben Lindstroma93f12f2002-06-07 01:51:06 +000026
27#include "buffer.h"
Ben Lindstroma93f12f2002-06-07 01:51:06 +000028#include "log.h"
29#include "atomicio.h"
30#include "msg.h"
Damien Miller3f941882006-03-31 23:13:02 +110031#include "misc.h"
Ben Lindstroma93f12f2002-06-07 01:51:06 +000032
Damien Miller51bf11f2003-11-17 21:20:47 +110033int
Damien Miller901119b2002-10-04 11:10:04 +100034ssh_msg_send(int fd, u_char type, Buffer *m)
Ben Lindstroma93f12f2002-06-07 01:51:06 +000035{
36 u_char buf[5];
37 u_int mlen = buffer_len(m);
38
Damien Miller901119b2002-10-04 11:10:04 +100039 debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
Ben Lindstroma93f12f2002-06-07 01:51:06 +000040
Damien Miller3f941882006-03-31 23:13:02 +110041 put_u32(buf, mlen + 1);
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000042 buf[4] = type; /* 1st byte of payload is mesg-type */
Damien Miller51bf11f2003-11-17 21:20:47 +110043 if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
44 error("ssh_msg_send: write");
45 return (-1);
46 }
47 if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
48 error("ssh_msg_send: write");
49 return (-1);
50 }
51 return (0);
Ben Lindstroma93f12f2002-06-07 01:51:06 +000052}
53
54int
Damien Miller901119b2002-10-04 11:10:04 +100055ssh_msg_recv(int fd, Buffer *m)
Ben Lindstroma93f12f2002-06-07 01:51:06 +000056{
57 u_char buf[4];
Ben Lindstroma93f12f2002-06-07 01:51:06 +000058 u_int msg_len;
59
Damien Miller901119b2002-10-04 11:10:04 +100060 debug3("ssh_msg_recv entering");
Ben Lindstroma93f12f2002-06-07 01:51:06 +000061
Damien Millerb253cc42005-05-26 12:23:44 +100062 if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
63 if (errno != EPIPE)
64 error("ssh_msg_recv: read: header");
Damien Miller51bf11f2003-11-17 21:20:47 +110065 return (-1);
Ben Lindstroma93f12f2002-06-07 01:51:06 +000066 }
Damien Miller3f941882006-03-31 23:13:02 +110067 msg_len = get_u32(buf);
Damien Miller51bf11f2003-11-17 21:20:47 +110068 if (msg_len > 256 * 1024) {
69 error("ssh_msg_recv: read: bad msg_len %u", msg_len);
70 return (-1);
71 }
Ben Lindstroma93f12f2002-06-07 01:51:06 +000072 buffer_clear(m);
73 buffer_append_space(m, msg_len);
Damien Millerb253cc42005-05-26 12:23:44 +100074 if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
75 error("ssh_msg_recv: read: %s", strerror(errno));
Damien Miller51bf11f2003-11-17 21:20:47 +110076 return (-1);
77 }
78 return (0);
Ben Lindstroma93f12f2002-06-07 01:51:06 +000079}