1 /* 2 * Copyright (c) 2002 Markus Friedl. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24 #include "includes.h" 25 RCSID("$OpenBSD: msg.c,v 1.7 2003/11/17 09:45:39 djm Exp $"); 26 27 #include "buffer.h" 28 #include "getput.h" 29 #include "log.h" 30 #include "atomicio.h" 31 #include "msg.h" 32 33 int 34 ssh_msg_send(int fd, u_char type, Buffer *m) 35 { 36 u_char buf[5]; 37 u_int mlen = buffer_len(m); 38 39 debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff); 40 41 PUT_32BIT(buf, mlen + 1); 42 buf[4] = type; /* 1st byte of payload is mesg-type */ 43 if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) { 44 error("ssh_msg_send: write"); 45 return (-1); 46 } 47 if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) { 48 error("ssh_msg_send: write"); 49 return (-1); 50 } 51 return (0); 52 } 53 54 int 55 ssh_msg_recv(int fd, Buffer *m) 56 { 57 u_char buf[4]; 58 ssize_t res; 59 u_int msg_len; 60 61 debug3("ssh_msg_recv entering"); 62 63 res = atomicio(read, fd, buf, sizeof(buf)); 64 if (res != sizeof(buf)) { 65 if (res != 0) 66 error("ssh_msg_recv: read: header %ld", (long)res); 67 return (-1); 68 } 69 msg_len = GET_32BIT(buf); 70 if (msg_len > 256 * 1024) { 71 error("ssh_msg_recv: read: bad msg_len %u", msg_len); 72 return (-1); 73 } 74 buffer_clear(m); 75 buffer_append_space(m, msg_len); 76 res = atomicio(read, fd, buffer_ptr(m), msg_len); 77 if (res != msg_len) { 78 error("ssh_msg_recv: read: %ld != msg_len", (long)res); 79 return (-1); 80 } 81 return (0); 82 } 83