1/*	$NetBSD: msg.c,v 1.2 2009/06/07 22:38:46 christos Exp $	*/
2/* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt Exp $ */
3/*
4 * Copyright (c) 2002 Markus Friedl.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "includes.h"
28__RCSID("$NetBSD: msg.c,v 1.2 2009/06/07 22:38:46 christos Exp $");
29#include <sys/types.h>
30#include <sys/uio.h>
31
32#include <errno.h>
33#include <stdio.h>
34#include <string.h>
35#include <unistd.h>
36#include <stdarg.h>
37#include <time.h>
38
39#include "buffer.h"
40#include "log.h"
41#include "atomicio.h"
42#include "msg.h"
43#include "misc.h"
44
45int
46ssh_msg_send(int fd, u_char type, Buffer *m)
47{
48	u_char buf[5];
49	u_int mlen = buffer_len(m);
50
51	debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
52
53	put_u32(buf, mlen + 1);
54	buf[4] = type;		/* 1st byte of payload is mesg-type */
55	if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
56		error("ssh_msg_send: write");
57		return (-1);
58	}
59	if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
60		error("ssh_msg_send: write");
61		return (-1);
62	}
63	return (0);
64}
65
66int
67ssh_msg_recv(int fd, Buffer *m)
68{
69	u_char buf[4];
70	u_int msg_len;
71
72	debug3("ssh_msg_recv entering");
73
74	if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
75		if (errno != EPIPE)
76			error("ssh_msg_recv: read: header");
77		return (-1);
78	}
79	msg_len = get_u32(buf);
80	if (msg_len > 256 * 1024) {
81		error("ssh_msg_recv: read: bad msg_len %u", msg_len);
82		return (-1);
83	}
84	buffer_clear(m);
85	buffer_append_space(m, msg_len);
86	if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
87		error("ssh_msg_recv: read: %s", strerror(errno));
88		return (-1);
89	}
90	return (0);
91}
92