[openssh.git] / msg.c

/*
 * 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 1.5 2002/12/19 00:07:02 djm Exp $");

#include "buffer.h"
#include "getput.h"
#include "log.h"
#include "atomicio.h"
#include "msg.h"

void
ssh_msg_send(int fd, u_char type, Buffer *m)
{
	u_char buf[5];
	u_int mlen = buffer_len(m);

	debug3("ssh_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("ssh_msg_send: write");
	if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen)
		fatal("ssh_msg_send: write");
}

int
ssh_msg_recv(int fd, Buffer *m)
{
	u_char buf[4];
	ssize_t res;
	u_int msg_len;

	debug3("ssh_msg_recv entering");

	res = atomicio(read, fd, buf, sizeof(buf));
	if (res != sizeof(buf)) {
		if (res == 0)
			return -1;
		fatal("ssh_msg_recv: read: header %ld", (long)res);
	}
	msg_len = GET_32BIT(buf);
	if (msg_len > 256 * 1024)
		fatal("ssh_msg_recv: read: bad msg_len %u", 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("ssh_msg_recv: read: %ld != msg_len", (long)res);
	return 0;
}
Commit	Line	Data
8afe456d	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"
3075ac59	25	RCSID("$OpenBSD: msg.c,v 1.5 2002/12/19 00:07:02 djm Exp $");
8afe456d	26
	27	#include "buffer.h"
	28	#include "getput.h"
	29	#include "log.h"
	30	#include "atomicio.h"
	31	#include "msg.h"
	32
	33	void
e987fdbe	34	ssh_msg_send(int fd, u_char type, Buffer *m)
8afe456d	35	{
	36	u_char buf[5];
	37	u_int mlen = buffer_len(m);
	38
e987fdbe	39	debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
8afe456d	40
8afe456d	41	PUT_32BIT(buf, mlen + 1);
7203d6bb	42	buf[4] = type; /* 1st byte of payload is mesg-type */
8afe456d	43	if (atomicio(write, fd, buf, sizeof(buf)) != sizeof(buf))
e987fdbe	44	fatal("ssh_msg_send: write");
8afe456d	45	if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen)
e987fdbe	46	fatal("ssh_msg_send: write");
8afe456d	47	}
	48
	49	int
e987fdbe	50	ssh_msg_recv(int fd, Buffer *m)
8afe456d	51	{
	52	u_char buf[4];
	53	ssize_t res;
	54	u_int msg_len;
	55
e987fdbe	56	debug3("ssh_msg_recv entering");
8afe456d	57
	58	res = atomicio(read, fd, buf, sizeof(buf));
	59	if (res != sizeof(buf)) {
	60	if (res == 0)
	61	return -1;
e987fdbe	62	fatal("ssh_msg_recv: read: header %ld", (long)res);
8afe456d	63	}
	64	msg_len = GET_32BIT(buf);
	65	if (msg_len > 256 * 1024)
e987fdbe	66	fatal("ssh_msg_recv: read: bad msg_len %u", msg_len);
8afe456d	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)
e987fdbe	71	fatal("ssh_msg_recv: read: %ld != msg_len", (long)res);
8afe456d	72	return 0;
8afe456d	73	}