1 /*
2 * Copyright (c) 2002 Markus Friedl. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24 #include "includes.h"
25 RCSID("$OpenBSD: msg.c,v 1.4 2002/07/01 16:15:25 deraadt Exp $");
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "buffer.h"
30 #include "getput.h"
31 #include "log.h"
32 #include "atomicio.h"
33 #include "msg.h"
34
35 void
ssh_msg_send(int fd,u_char type,Buffer * m)36 ssh_msg_send(int fd, u_char type, Buffer *m)
37 {
38 u_char buf[5];
39 u_int mlen = buffer_len(m);
40
41 debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
42
43 PUT_32BIT(buf, mlen + 1);
44 buf[4] = type; /* 1st byte of payload is mesg-type */
45 if (atomicio(write, fd, buf, sizeof(buf)) != sizeof(buf))
46 fatal("ssh_msg_send: write");
47 if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen)
48 fatal("ssh_msg_send: write");
49 }
50
51 int
ssh_msg_recv(int fd,Buffer * m)52 ssh_msg_recv(int fd, Buffer *m)
53 {
54 u_char buf[4];
55 ssize_t res;
56 u_int msg_len;
57
58 debug3("ssh_msg_recv entering");
59
60 res = atomicio(read, fd, buf, sizeof(buf));
61 if (res != sizeof(buf)) {
62 if (res == 0)
63 return -1;
64 fatal("ssh_msg_recv: read: header %ld", (long)res);
65 }
66 msg_len = GET_32BIT(buf);
67 if (msg_len > 256 * 1024)
68 fatal("ssh_msg_recv: read: bad msg_len %u", msg_len);
69 buffer_clear(m);
70 buffer_append_space(m, msg_len);
71 res = atomicio(read, fd, buffer_ptr(m), msg_len);
72 if (res != msg_len)
73 fatal("ssh_msg_recv: read: %ld != msg_len", (long)res);
74 return 0;
75 }
76