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884dc78b | 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" | |
d03f4262 | 25 | RCSID("$OpenBSD: msg.c,v 1.4 2002/07/01 16:15:25 deraadt Exp $"); |
884dc78b | 26 | |
27 | #include "buffer.h" | |
28 | #include "getput.h" | |
29 | #include "log.h" | |
30 | #include "atomicio.h" | |
31 | #include "msg.h" | |
32 | ||
33 | void | |
d03f4262 | 34 | ssh_msg_send(int fd, u_char type, Buffer *m) |
884dc78b | 35 | { |
36 | u_char buf[5]; | |
37 | u_int mlen = buffer_len(m); | |
38 | ||
d03f4262 | 39 | debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff); |
884dc78b | 40 | |
41 | PUT_32BIT(buf, mlen + 1); | |
42 | buf[4] = type; /* 1st byte of payload is mesg-type */ | |
43 | if (atomicio(write, fd, buf, sizeof(buf)) != sizeof(buf)) | |
d03f4262 | 44 | fatal("ssh_msg_send: write"); |
884dc78b | 45 | if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen) |
d03f4262 | 46 | fatal("ssh_msg_send: write"); |
884dc78b | 47 | } |
48 | ||
49 | int | |
d03f4262 | 50 | ssh_msg_recv(int fd, Buffer *m) |
884dc78b | 51 | { |
52 | u_char buf[4]; | |
53 | ssize_t res; | |
54 | u_int msg_len; | |
55 | ||
d03f4262 | 56 | debug3("ssh_msg_recv entering"); |
884dc78b | 57 | |
58 | res = atomicio(read, fd, buf, sizeof(buf)); | |
59 | if (res != sizeof(buf)) { | |
60 | if (res == 0) | |
61 | return -1; | |
d03f4262 | 62 | fatal("ssh_msg_recv: read: header %ld", (long)res); |
884dc78b | 63 | } |
64 | msg_len = GET_32BIT(buf); | |
65 | if (msg_len > 256 * 1024) | |
d03f4262 | 66 | fatal("ssh_msg_recv: read: bad msg_len %u", msg_len); |
884dc78b | 67 | buffer_clear(m); |
68 | buffer_append_space(m, msg_len); | |
69 | res = atomicio(read, fd, buffer_ptr(m), msg_len); | |
70 | if (res != msg_len) | |
d03f4262 | 71 | fatal("ssh_msg_recv: read: %ld != msg_len", (long)res); |
884dc78b | 72 | return 0; |
73 | } |