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