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