1 /* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt 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 "buffer.h" 38 #include "log.h" 39 #include "atomicio.h" 40 #include "msg.h" 41 #include "misc.h" 42 43 int 44 ssh_msg_send(int fd, u_char type, Buffer *m) 45 { 46 u_char buf[5]; 47 u_int mlen = buffer_len(m); 48 49 debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff); 50 51 put_u32(buf, mlen + 1); 52 buf[4] = type; /* 1st byte of payload is mesg-type */ 53 if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) { 54 error("ssh_msg_send: write"); 55 return (-1); 56 } 57 if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) { 58 error("ssh_msg_send: write"); 59 return (-1); 60 } 61 return (0); 62 } 63 64 int 65 ssh_msg_recv(int fd, Buffer *m) 66 { 67 u_char buf[4]; 68 u_int msg_len; 69 70 debug3("ssh_msg_recv entering"); 71 72 if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) { 73 if (errno != EPIPE) 74 error("ssh_msg_recv: read: header"); 75 return (-1); 76 } 77 msg_len = get_u32(buf); 78 if (msg_len > 256 * 1024) { 79 error("ssh_msg_recv: read: bad msg_len %u", msg_len); 80 return (-1); 81 } 82 buffer_clear(m); 83 buffer_append_space(m, msg_len); 84 if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) { 85 error("ssh_msg_recv: read: %s", strerror(errno)); 86 return (-1); 87 } 88 return (0); 89 } 90