blob: 3224726684860584c45bf5bffc4878e6e603e46b [file] [log] [blame]
Damien Millere3476ed2006-07-24 14:13:33 +10001/* $OpenBSD: msg.c,v 1.14 2006/07/22 20:48:23 stevesk 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
Damien Millere6b3b612006-07-24 14:01:23 +100027#include <sys/types.h>
28
Darren Tucker39972492006-07-12 22:22:46 +100029#include <errno.h>
Damien Millere3476ed2006-07-24 14:13:33 +100030#include <string.h>
Damien Millere6b3b612006-07-24 14:01:23 +100031#include <unistd.h>
Darren Tucker39972492006-07-12 22:22:46 +100032
Ben Lindstroma93f12f2002-06-07 01:51:06 +000033#include "buffer.h"
Ben Lindstroma93f12f2002-06-07 01:51:06 +000034#include "log.h"
35#include "atomicio.h"
36#include "msg.h"
Damien Miller3f941882006-03-31 23:13:02 +110037#include "misc.h"
Ben Lindstroma93f12f2002-06-07 01:51:06 +000038
Damien Miller51bf11f2003-11-17 21:20:47 +110039int
Damien Miller901119b2002-10-04 11:10:04 +100040ssh_msg_send(int fd, u_char type, Buffer *m)
Ben Lindstroma93f12f2002-06-07 01:51:06 +000041{
42 u_char buf[5];
43 u_int mlen = buffer_len(m);
44
Damien Miller901119b2002-10-04 11:10:04 +100045 debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
Ben Lindstroma93f12f2002-06-07 01:51:06 +000046
Damien Miller3f941882006-03-31 23:13:02 +110047 put_u32(buf, mlen + 1);
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000048 buf[4] = type; /* 1st byte of payload is mesg-type */
Damien Miller51bf11f2003-11-17 21:20:47 +110049 if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
50 error("ssh_msg_send: write");
51 return (-1);
52 }
53 if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
54 error("ssh_msg_send: write");
55 return (-1);
56 }
57 return (0);
Ben Lindstroma93f12f2002-06-07 01:51:06 +000058}
59
60int
Damien Miller901119b2002-10-04 11:10:04 +100061ssh_msg_recv(int fd, Buffer *m)
Ben Lindstroma93f12f2002-06-07 01:51:06 +000062{
63 u_char buf[4];
Ben Lindstroma93f12f2002-06-07 01:51:06 +000064 u_int msg_len;
65
Damien Miller901119b2002-10-04 11:10:04 +100066 debug3("ssh_msg_recv entering");
Ben Lindstroma93f12f2002-06-07 01:51:06 +000067
Damien Millerb253cc42005-05-26 12:23:44 +100068 if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
69 if (errno != EPIPE)
70 error("ssh_msg_recv: read: header");
Damien Miller51bf11f2003-11-17 21:20:47 +110071 return (-1);
Ben Lindstroma93f12f2002-06-07 01:51:06 +000072 }
Damien Miller3f941882006-03-31 23:13:02 +110073 msg_len = get_u32(buf);
Damien Miller51bf11f2003-11-17 21:20:47 +110074 if (msg_len > 256 * 1024) {
75 error("ssh_msg_recv: read: bad msg_len %u", msg_len);
76 return (-1);
77 }
Ben Lindstroma93f12f2002-06-07 01:51:06 +000078 buffer_clear(m);
79 buffer_append_space(m, msg_len);
Damien Millerb253cc42005-05-26 12:23:44 +100080 if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
81 error("ssh_msg_recv: read: %s", strerror(errno));
Damien Miller51bf11f2003-11-17 21:20:47 +110082 return (-1);
83 }
84 return (0);
Ben Lindstroma93f12f2002-06-07 01:51:06 +000085}