1 /* $NetBSD: msg.c,v 1.11 2021/03/05 17:47:16 christos Exp $ */ 2 /* $OpenBSD: msg.c,v 1.20 2020/10/18 11:32:01 djm Exp $ */ 3 4 /* 5 * Copyright (c) 2002 Markus Friedl. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "includes.h" 29 __RCSID("$NetBSD: msg.c,v 1.11 2021/03/05 17:47:16 christos Exp $"); 30 #include <sys/types.h> 31 #include <sys/uio.h> 32 33 #include <errno.h> 34 #include <stdio.h> 35 #include <string.h> 36 #include <unistd.h> 37 #include <stdarg.h> 38 #include <time.h> 39 40 #include "sshbuf.h" 41 #include "ssherr.h" 42 #include "log.h" 43 #include "atomicio.h" 44 #include "msg.h" 45 #include "misc.h" 46 47 int 48 ssh_msg_send(int fd, u_char type, struct sshbuf *m) 49 { 50 u_char buf[5]; 51 u_int mlen = sshbuf_len(m); 52 53 debug3_f("type %u", (unsigned int)type & 0xff); 54 55 put_u32(buf, mlen + 1); 56 buf[4] = type; /* 1st byte of payload is mesg-type */ 57 if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) { 58 error_f("write: %s", strerror(errno)); 59 return (-1); 60 } 61 if (atomicio(vwrite, fd, sshbuf_mutable_ptr(m), mlen) != mlen) { 62 error_f("write: %s", strerror(errno)); 63 return (-1); 64 } 65 return (0); 66 } 67 68 int 69 ssh_msg_recv(int fd, struct sshbuf *m) 70 { 71 u_char buf[4], *p; 72 u_int msg_len; 73 int r; 74 75 debug3("ssh_msg_recv entering"); 76 77 if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) { 78 if (errno != EPIPE) 79 error_f("read header: %s", strerror(errno)); 80 return (-1); 81 } 82 msg_len = get_u32(buf); 83 if (msg_len > sshbuf_max_size(m)) { 84 error_f("read: bad msg_len %u", msg_len); 85 return (-1); 86 } 87 sshbuf_reset(m); 88 if ((r = sshbuf_reserve(m, msg_len, &p)) != 0) { 89 error_fr(r, "reserve"); 90 return -1; 91 } 92 if (atomicio(read, fd, p, msg_len) != msg_len) { 93 error_f("read: %s", strerror(errno)); 94 return (-1); 95 } 96 return (0); 97 } 98