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1 | /* $OpenBSD: msg.c,v 1.12 2006/07/11 20:07:25 stevesk 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 | #include "includes.h" | |
26 | ||
27 | #include <errno.h> | |
28 | ||
29 | #include "buffer.h" | |
30 | #include "log.h" | |
31 | #include "atomicio.h" | |
32 | #include "msg.h" | |
33 | #include "misc.h" | |
34 | ||
35 | int | |
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_u32(buf, mlen + 1); | |
44 | buf[4] = type; /* 1st byte of payload is mesg-type */ | |
45 | if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) { | |
46 | error("ssh_msg_send: write"); | |
47 | return (-1); | |
48 | } | |
49 | if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) { | |
50 | error("ssh_msg_send: write"); | |
51 | return (-1); | |
52 | } | |
53 | return (0); | |
54 | } | |
55 | ||
56 | int | |
57 | ssh_msg_recv(int fd, Buffer *m) | |
58 | { | |
59 | u_char buf[4]; | |
60 | u_int msg_len; | |
61 | ||
62 | debug3("ssh_msg_recv entering"); | |
63 | ||
64 | if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) { | |
65 | if (errno != EPIPE) | |
66 | error("ssh_msg_recv: read: header"); | |
67 | return (-1); | |
68 | } | |
69 | msg_len = get_u32(buf); | |
70 | if (msg_len > 256 * 1024) { | |
71 | error("ssh_msg_recv: read: bad msg_len %u", msg_len); | |
72 | return (-1); | |
73 | } | |
74 | buffer_clear(m); | |
75 | buffer_append_space(m, msg_len); | |
76 | if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) { | |
77 | error("ssh_msg_recv: read: %s", strerror(errno)); | |
78 | return (-1); | |
79 | } | |
80 | return (0); | |
81 | } |