crypto/openssh-4/msg.c

   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 1.8 2005/05/24 17:32:43 avsm 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         u_int msg_len;
  59
  60         debug3("ssh_msg_recv entering");
  61
  62         if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
  63                 if (errno != EPIPE)
  64                         error("ssh_msg_recv: read: header");
  65                 return (-1);
  66         }
  67         msg_len = GET_32BIT(buf);
  68         if (msg_len > 256 * 1024) {
  69                 error("ssh_msg_recv: read: bad msg_len %u", msg_len);
  70                 return (-1);
  71         }
  72         buffer_clear(m);
  73         buffer_append_space(m, msg_len);
  74         if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
  75                 error("ssh_msg_recv: read: %s", strerror(errno));
  76                 return (-1);
  77         }
  78         return (0);
  79 }