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 1.4 2002/07/01 16:15:25 deraadt Exp $"); 26 27 #include "buffer.h" 28 #include "getput.h" 29 #include "log.h" 30 #include "atomicio.h" 31 #include "msg.h" 32 33 void 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(write, fd, buf, sizeof(buf)) != sizeof(buf)) 44 fatal("ssh_msg_send: write"); 45 if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen) 46 fatal("ssh_msg_send: write"); 47 } 48 49 int 50 ssh_msg_recv(int fd, Buffer *m) 51 { 52 u_char buf[4]; 53 ssize_t res; 54 u_int msg_len; 55 56 debug3("ssh_msg_recv entering"); 57 58 res = atomicio(read, fd, buf, sizeof(buf)); 59 if (res != sizeof(buf)) { 60 if (res == 0) 61 return -1; 62 fatal("ssh_msg_recv: read: header %ld", (long)res); 63 } 64 msg_len = GET_32BIT(buf); 65 if (msg_len > 256 * 1024) 66 fatal("ssh_msg_recv: read: bad msg_len %u", msg_len); 67 buffer_clear(m); 68 buffer_append_space(m, msg_len); 69 res = atomicio(read, fd, buffer_ptr(m), msg_len); 70 if (res != msg_len) 71 fatal("ssh_msg_recv: read: %ld != msg_len", (long)res); 72 return 0; 73 } 74