/* $NetBSD: msg.c,v 1.8.2.1 2023/12/25 12:31:05 martin Exp $ */ /* $OpenBSD: msg.c,v 1.20 2020/10/18 11:32:01 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 "includes.h" __RCSID("$NetBSD: msg.c,v 1.8.2.1 2023/12/25 12:31:05 martin Exp $"); #include #include #include #include #include #include #include #include #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", (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_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); } 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); }