1 /* $NetBSD: msg.c,v 1.4 2015/04/03 23:58:19 christos Exp $ */ 2 /* $OpenBSD: msg.c,v 1.16 2015/01/15 09:40:00 djm Exp $ */ 3 /* 4 * Copyright (c) 2002 Markus Friedl. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "includes.h" 28 __RCSID("$NetBSD: msg.c,v 1.4 2015/04/03 23:58:19 christos Exp $"); 29 #include <sys/types.h> 30 #include <sys/uio.h> 31 32 #include <errno.h> 33 #include <stdio.h> 34 #include <string.h> 35 #include <unistd.h> 36 #include <stdarg.h> 37 #include <time.h> 38 39 #include "sshbuf.h" 40 #include "ssherr.h" 41 #include "log.h" 42 #include "atomicio.h" 43 #include "msg.h" 44 #include "misc.h" 45 46 int 47 ssh_msg_send(int fd, u_char type, struct sshbuf *m) 48 { 49 u_char buf[5]; 50 u_int mlen = sshbuf_len(m); 51 52 debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff); 53 54 put_u32(buf, mlen + 1); 55 buf[4] = type; /* 1st byte of payload is mesg-type */ 56 if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) { 57 error("ssh_msg_send: write"); 58 return (-1); 59 } 60 if (atomicio(vwrite, fd, __UNCONST(sshbuf_ptr(m)), mlen) != mlen) { 61 error("ssh_msg_send: write"); 62 return (-1); 63 } 64 return (0); 65 } 66 67 int 68 ssh_msg_recv(int fd, struct sshbuf *m) 69 { 70 u_char buf[4], *p; 71 u_int msg_len; 72 int r; 73 74 debug3("ssh_msg_recv entering"); 75 76 if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) { 77 if (errno != EPIPE) 78 error("ssh_msg_recv: read: header"); 79 return (-1); 80 } 81 msg_len = get_u32(buf); 82 if (msg_len > 256 * 1024) { 83 error("ssh_msg_recv: read: bad msg_len %u", msg_len); 84 return (-1); 85 } 86 sshbuf_reset(m); 87 if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) { 88 error("%s: buffer error: %s", __func__, ssh_err(r)); 89 return -1; 90 } 91 if (atomicio(read, fd, p, msg_len) != msg_len) { 92 error("ssh_msg_recv: read: %s", strerror(errno)); 93 return (-1); 94 } 95 return (0); 96 } 97