/* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt 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 "buffer.h" #include "log.h" #include "atomicio.h" #include "msg.h" #include "misc.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_u32(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_u32(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); }