1 /* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt Exp $ */
2 /*
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
26 #include "includes.h"
27
28 #include <sys/types.h>
29 #include <sys/uio.h>
30
31 #include <errno.h>
32 #include <stdio.h>
33 #include <string.h>
34 #include <unistd.h>
35 #include <stdarg.h>
36
37 #include "buffer.h"
38 #include "log.h"
39 #include "atomicio.h"
40 #include "msg.h"
41 #include "misc.h"
42
43 int
ssh_msg_send(int fd,u_char type,Buffer * m)44 ssh_msg_send(int fd, u_char type, Buffer *m)
45 {
46 u_char buf[5];
47 u_int mlen = buffer_len(m);
48
49 debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
50
51 put_u32(buf, mlen + 1);
52 buf[4] = type; /* 1st byte of payload is mesg-type */
53 if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
54 error("ssh_msg_send: write");
55 return (-1);
56 }
57 if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
58 error("ssh_msg_send: write");
59 return (-1);
60 }
61 return (0);
62 }
63
64 int
ssh_msg_recv(int fd,Buffer * m)65 ssh_msg_recv(int fd, Buffer *m)
66 {
67 u_char buf[4];
68 u_int msg_len;
69
70 debug3("ssh_msg_recv entering");
71
72 if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
73 if (errno != EPIPE)
74 error("ssh_msg_recv: read: header");
75 return (-1);
76 }
77 msg_len = get_u32(buf);
78 if (msg_len > 256 * 1024) {
79 error("ssh_msg_recv: read: bad msg_len %u", msg_len);
80 return (-1);
81 }
82 buffer_clear(m);
83 buffer_append_space(m, msg_len);
84 if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
85 error("ssh_msg_recv: read: %s", strerror(errno));
86 return (-1);
87 }
88 return (0);
89 }
90