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/* $OpenBSD: msg.c,v 1.16 2015/01/15 09:40:00 djm 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 <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, (u_char *)sshbuf_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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} |