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95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/* $OpenBSD: msg.c,v 1.17 2018/07/09 21:59:10 markus Exp $ */
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/*
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* Copyright (c) 2002 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include "sshbuf.h"
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#include "ssherr.h"
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#include "log.h"
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#include "atomicio.h"
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#include "msg.h"
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#include "misc.h"
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int
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ssh_msg_send(int fd, u_char type, struct sshbuf *m)
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{
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u_char buf[5];
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u_int mlen = sshbuf_len(m);
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debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
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put_u32(buf, mlen + 1);
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buf[4] = type; /* 1st byte of payload is mesg-type */
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if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
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error("ssh_msg_send: write");
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return (-1);
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}
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if (atomicio(vwrite, fd, sshbuf_mutable_ptr(m), mlen) != mlen) {
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error("ssh_msg_send: write");
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return (-1);
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}
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return (0);
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}
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int
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ssh_msg_recv(int fd, struct sshbuf *m)
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{
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u_char buf[4], *p;
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u_int msg_len;
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int r;
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debug3("ssh_msg_recv entering");
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if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
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if (errno != EPIPE)
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error("ssh_msg_recv: read: header");
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return (-1);
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}
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msg_len = get_u32(buf);
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if (msg_len > 256 * 1024) {
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error("ssh_msg_recv: read: bad msg_len %u", msg_len);
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return (-1);
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}
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sshbuf_reset(m);
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if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) {
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error("%s: buffer error: %s", __func__, ssh_err(r));
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return -1;
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}
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if (atomicio(read, fd, p, msg_len) != msg_len) {
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error("ssh_msg_recv: read: %s", strerror(errno));
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return (-1);
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}
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return (0);
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}
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