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      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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #include "buffer.h"
     30 #include "getput.h"
     31 #include "log.h"
     32 #include "atomicio.h"
     33 #include "msg.h"
     34 
     35 void
     36 ssh_msg_send(int fd, u_char type, Buffer *m)
     37 {
     38 	u_char buf[5];
     39 	u_int mlen = buffer_len(m);
     40 
     41 	debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
     42 
     43 	PUT_32BIT(buf, mlen + 1);
     44 	buf[4] = type;		/* 1st byte of payload is mesg-type */
     45 	if (atomicio(write, fd, buf, sizeof(buf)) != sizeof(buf))
     46 		fatal("ssh_msg_send: write");
     47 	if (atomicio(write, fd, buffer_ptr(m), mlen) != mlen)
     48 		fatal("ssh_msg_send: write");
     49 }
     50 
     51 int
     52 ssh_msg_recv(int fd, Buffer *m)
     53 {
     54 	u_char buf[4];
     55 	ssize_t res;
     56 	u_int msg_len;
     57 
     58 	debug3("ssh_msg_recv entering");
     59 
     60 	res = atomicio(read, fd, buf, sizeof(buf));
     61 	if (res != sizeof(buf)) {
     62 		if (res == 0)
     63 			return -1;
     64 		fatal("ssh_msg_recv: read: header %ld", (long)res);
     65 	}
     66 	msg_len = GET_32BIT(buf);
     67 	if (msg_len > 256 * 1024)
     68 		fatal("ssh_msg_recv: read: bad msg_len %u", msg_len);
     69 	buffer_clear(m);
     70 	buffer_append_space(m, msg_len);
     71 	res = atomicio(read, fd, buffer_ptr(m), msg_len);
     72 	if (res != msg_len)
     73 		fatal("ssh_msg_recv: read: %ld != msg_len", (long)res);
     74 	return 0;
     75 }
     76