| 1 | /* |
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| 2 | * Copyright (c) 2002 Markus Friedl. All rights reserved. |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions |
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| 6 | * are met: |
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| 7 | * 1. Redistributions of source code must retain the above copyright |
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| 8 | * notice, this list of conditions and the following disclaimer. |
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer in the |
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| 11 | * documentation and/or other materials provided with the distribution. |
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| 12 | * |
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| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 23 | */ |
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| 24 | #include "includes.h" |
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| 25 | RCSID("$OpenBSD: msg.c,v 1.8 2005/05/24 17:32:43 avsm Exp $"); |
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| 26 | |
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| 27 | #include "buffer.h" |
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| 28 | #include "getput.h" |
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| 29 | #include "log.h" |
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| 30 | #include "atomicio.h" |
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| 31 | #include "msg.h" |
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| 32 | |
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| 33 | int |
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| 34 | ssh_msg_send(int fd, u_char type, Buffer *m) |
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| 35 | { |
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| 36 | u_char buf[5]; |
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| 37 | u_int mlen = buffer_len(m); |
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| 38 | |
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| 39 | debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff); |
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| 40 | |
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| 41 | PUT_32BIT(buf, mlen + 1); |
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| 42 | buf[4] = type; /* 1st byte of payload is mesg-type */ |
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| 43 | if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) { |
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| 44 | error("ssh_msg_send: write"); |
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| 45 | return (-1); |
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| 46 | } |
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| 47 | if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) { |
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| 48 | error("ssh_msg_send: write"); |
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| 49 | return (-1); |
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| 50 | } |
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| 51 | return (0); |
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| 52 | } |
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| 53 | |
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| 54 | int |
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| 55 | ssh_msg_recv(int fd, Buffer *m) |
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| 56 | { |
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| 57 | u_char buf[4]; |
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| 58 | u_int msg_len; |
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| 59 | |
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| 60 | debug3("ssh_msg_recv entering"); |
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| 61 | |
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| 62 | if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) { |
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| 63 | if (errno != EPIPE) |
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| 64 | error("ssh_msg_recv: read: header"); |
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| 65 | return (-1); |
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| 66 | } |
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| 67 | msg_len = GET_32BIT(buf); |
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| 68 | if (msg_len > 256 * 1024) { |
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| 69 | error("ssh_msg_recv: read: bad msg_len %u", msg_len); |
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| 70 | return (-1); |
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| 71 | } |
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| 72 | buffer_clear(m); |
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| 73 | buffer_append_space(m, msg_len); |
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| 74 | if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) { |
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| 75 | error("ssh_msg_recv: read: %s", strerror(errno)); |
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| 76 | return (-1); |
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| 77 | } |
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| 78 | return (0); |
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| 79 | } |
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