[gssapi-openssh.git] / openssh / 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 1.8 2005/05/24 17:32:43 avsm Exp $");

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

int
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(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
		error("ssh_msg_send: write");
		return (-1);
	}
	if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
		error("ssh_msg_send: write");
		return (-1);
	}
	return (0);
}

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

	debug3("ssh_msg_recv entering");

	if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
		if (errno != EPIPE)
			error("ssh_msg_recv: read: header");
		return (-1);
	}
	msg_len = GET_32BIT(buf);
	if (msg_len > 256 * 1024) {
		error("ssh_msg_recv: read: bad msg_len %u", msg_len);
		return (-1);
	}
	buffer_clear(m);
	buffer_append_space(m, msg_len);
	if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
		error("ssh_msg_recv: read: %s", strerror(errno));
		return (-1);
	}
	return (0);
}
Commit	Line	Data
f5799ae1	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"
665a873d	25	RCSID("$OpenBSD: msg.c,v 1.8 2005/05/24 17:32:43 avsm Exp $");
f5799ae1	26
	27	#include "buffer.h"
	28	#include "getput.h"
	29	#include "log.h"
	30	#include "atomicio.h"
	31	#include "msg.h"
	32
cdd66111	33	int
41b2f314	34	ssh_msg_send(int fd, u_char type, Buffer *m)
f5799ae1	35	{
	36	u_char buf[5];
	37	u_int mlen = buffer_len(m);
	38
41b2f314	39	debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
f5799ae1	40
	41	PUT_32BIT(buf, mlen + 1);
	42	buf[4] = type; /* 1st byte of payload is mesg-type */
cdd66111	43	if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
	44	error("ssh_msg_send: write");
	45	return (-1);
	46	}
	47	if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
	48	error("ssh_msg_send: write");
	49	return (-1);
	50	}
	51	return (0);
f5799ae1	52	}
	53
	54	int
41b2f314	55	ssh_msg_recv(int fd, Buffer *m)
f5799ae1	56	{
f5799ae1	57	u_char buf[4];
f5799ae1	58	u_int msg_len;
f5799ae1	59
41b2f314	60	debug3("ssh_msg_recv entering");
f5799ae1	61
665a873d	62	if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
	63	if (errno != EPIPE)
	64	error("ssh_msg_recv: read: header");
cdd66111	65	return (-1);
f5799ae1	66	}
f5799ae1	67	msg_len = GET_32BIT(buf);
cdd66111	68	if (msg_len > 256 * 1024) {
	69	error("ssh_msg_recv: read: bad msg_len %u", msg_len);
	70	return (-1);
	71	}
f5799ae1	72	buffer_clear(m);
f5799ae1	73	buffer_append_space(m, msg_len);
665a873d	74	if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
665a873d	75	error("ssh_msg_recv: read: %s", strerror(errno));
cdd66111	76	return (-1);
	77	}
	78	return (0);
f5799ae1	79	}