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/* $OpenBSD: msg.c,v 1.21 2024/05/17 00:30:24 djm Exp $ */
/*
* 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 <sys/types.h>
#include <sys/uio.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include "sshbuf.h"
#include "ssherr.h"
#include "log.h"
#include "atomicio.h"
#include "msg.h"
#include "misc.h"
int
ssh_msg_send(int fd, u_char type, struct sshbuf *m)
{
u_char buf[5];
u_int mlen = sshbuf_len(m);
debug3_f("type %u len %zu", (unsigned int)type & 0xff, sshbuf_len(m));
put_u32(buf, mlen + 1);
buf[4] = type; /* 1st byte of payload is mesg-type */
if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
error_f("write: %s", strerror(errno));
return (-1);
}
if (atomicio(vwrite, fd, sshbuf_mutable_ptr(m), mlen) != mlen) {
error_f("write: %s", strerror(errno));
return (-1);
}
debug3_f("done");
return (0);
}
int
ssh_msg_recv(int fd, struct sshbuf *m)
{
u_char buf[4], *p;
u_int msg_len;
int r;
debug3("ssh_msg_recv entering");
if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
if (errno != EPIPE)
error_f("read header: %s", strerror(errno));
return (-1);
}
msg_len = get_u32(buf);
if (msg_len > sshbuf_max_size(m)) {
error_f("read: bad msg_len %u", msg_len);
return (-1);
}
sshbuf_reset(m);
if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) {
error_fr(r, "reserve");
return -1;
}
if (atomicio(read, fd, p, msg_len) != msg_len) {
error_f("read: %s", strerror(errno));
return (-1);
}
return (0);
}
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