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/*
* Copyright (c) 2002 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
RCSID("$OpenBSD: msg.c,v 1.3 2002/06/24 15:49:22 itojun Exp $");
#include "buffer.h"
#include "getput.h"
#include "log.h"
#include "atomicio.h"
#include "msg.h"
void
msg_send(int fd, u_char type, Buffer *m)
{
u_char buf[5];
u_int mlen = buffer_len(m);
debug3("msg_send: type %u", (unsigned int)type & 0xff);
PUT_32BIT(buf, mlen + 1);
buf[4] = type; /* 1st byte of payload is mesg-type */
if (atomicio(write, fd, buf, sizeof(buf)) != sizeof(buf))
fatal("msg_send: write");
if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen)
fatal("msg_send: write");
}
int
msg_recv(int fd, Buffer *m)
{
u_char buf[4];
ssize_t res;
u_int msg_len;
debug3("msg_recv entering");
res = atomicio(read, fd, buf, sizeof(buf));
if (res != sizeof(buf)) {
if (res == 0)
return -1;
fatal("msg_recv: read: header %ld", (long)res);
}
msg_len = GET_32BIT(buf);
if (msg_len > 256 * 1024)
fatal("msg_recv: read: bad msg_len %d", msg_len);
buffer_clear(m);
buffer_append_space(m, msg_len);
res = atomicio(read, fd, buffer_ptr(m), msg_len);
if (res != msg_len)
fatal("msg_recv: read: %ld != msg_len", (long)res);
return 0;
}
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