crypto/dist/ssh/msg.c

   1 /*      $NetBSD: msg.c,v 1.12 2006/09/28 21:22:14 christos Exp $        */
   2 /* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt Exp $ */
   3 /*
   4  * Copyright (c) 2002 Markus Friedl.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26 #include "includes.h"
  27 __RCSID("$NetBSD: msg.c,v 1.12 2006/09/28 21:22:14 christos Exp $");
  28
  29 #include <sys/types.h>
  30 #include <sys/uio.h>
  31
  32 #include <errno.h>
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36 #include <stdarg.h>
  37 #include <time.h>
  38
  39 #include "buffer.h"
  40 #include "log.h"
  41 #include "atomicio.h"
  42 #include "msg.h"
  43 #include "misc.h"
  44
  45 int
  46 ssh_msg_send(int fd, u_char type, Buffer *m)
  47 {
  48         u_char buf[5];
  49         u_int mlen = buffer_len(m);
  50
  51         debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
  52
  53         put_u32(buf, mlen + 1);
  54         buf[4] = type;          /* 1st byte of payload is mesg-type */
  55         if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
  56                 error("ssh_msg_send: write");
  57                 return (-1);
  58         }
  59         if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
  60                 error("ssh_msg_send: write");
  61                 return (-1);
  62         }
  63         return (0);
  64 }
  65
  66 int
  67 ssh_msg_recv(int fd, Buffer *m)
  68 {
  69         u_char buf[4];
  70         u_int msg_len;
  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         buffer_clear(m);
  85         buffer_append_space(m, msg_len);
  86         if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
  87                 error("ssh_msg_recv: read: %s", strerror(errno));
  88                 return (-1);
  89         }
  90         return (0);
  91 }