msg.c revision 124208
13417Scsgr/*
23784Sphk * Copyright (c) 2002 Markus Friedl.  All rights reserved.
33417Scsgr *
43417Scsgr * Redistribution and use in source and binary forms, with or without
593149Sphk * modification, are permitted provided that the following conditions
63417Scsgr * are met:
73417Scsgr * 1. Redistributions of source code must retain the above copyright
83417Scsgr *    notice, this list of conditions and the following disclaimer.
93417Scsgr * 2. Redistributions in binary form must reproduce the above copyright
103417Scsgr *    notice, this list of conditions and the following disclaimer in the
11116182Sobrien *    documentation and/or other materials provided with the distribution.
12116182Sobrien *
13116182Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
143417Scsgr * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
153784Sphk * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1655206Speter * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
173417Scsgr * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
1841057Speter * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
197840Sphk * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
203417Scsgr * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
213417Scsgr * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
2255206Speter * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2330354Sphk */
2441057Speter#include "includes.h"
2530309SphkRCSID("$OpenBSD: msg.c,v 1.6 2003/06/28 16:23:06 deraadt Exp $");
263784Sphk
273784Sphk#include "buffer.h"
283784Sphk#include "getput.h"
293784Sphk#include "log.h"
303784Sphk#include "atomicio.h"
313417Scsgr#include "msg.h"
3255206Speter
333784Sphkvoid
347840Sphkssh_msg_send(int fd, u_char type, Buffer *m)
353784Sphk{
3655206Speter	u_char buf[5];
373417Scsgr	u_int mlen = buffer_len(m);
387840Sphk
397840Sphk	debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
407840Sphk
417840Sphk	PUT_32BIT(buf, mlen + 1);
423417Scsgr	buf[4] = type;		/* 1st byte of payload is mesg-type */
433784Sphk	if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf))
443784Sphk		fatal("ssh_msg_send: write");
453784Sphk	if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen)
463784Sphk		fatal("ssh_msg_send: write");
473417Scsgr}
483417Scsgr
493417Scsgrint
503417Scsgrssh_msg_recv(int fd, Buffer *m)
5155206Speter{
5241057Speter	u_char buf[4];
5341057Speter	ssize_t res;
5441057Speter	u_int msg_len;
5541057Speter
567840Sphk	debug3("ssh_msg_recv entering");
577840Sphk
583784Sphk	res = atomicio(read, fd, buf, sizeof(buf));
593784Sphk	if (res != sizeof(buf)) {
603784Sphk		if (res == 0)
613784Sphk			return -1;
623417Scsgr		fatal("ssh_msg_recv: read: header %ld", (long)res);
633417Scsgr	}
643417Scsgr	msg_len = GET_32BIT(buf);
653417Scsgr	if (msg_len > 256 * 1024)
663417Scsgr		fatal("ssh_msg_recv: read: bad msg_len %u", msg_len);
673417Scsgr	buffer_clear(m);
683417Scsgr	buffer_append_space(m, msg_len);
693417Scsgr	res = atomicio(read, fd, buffer_ptr(m), msg_len);
703417Scsgr	if (res != msg_len)
713417Scsgr		fatal("ssh_msg_recv: read: %ld != msg_len", (long)res);
723417Scsgr	return 0;
733417Scsgr}
743417Scsgr