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       1                 :            : /* $OpenBSD: msg.c,v 1.15 2006/08/03 03:34:42 deraadt Exp $ */
       2                 :            : /*
       3                 :            :  * Copyright (c) 2002 Markus Friedl.  All rights reserved.
       4                 :            :  *
       5                 :            :  * Redistribution and use in source and binary forms, with or without
       6                 :            :  * modification, are permitted provided that the following conditions
       7                 :            :  * are met:
       8                 :            :  * 1. Redistributions of source code must retain the above copyright
       9                 :            :  *    notice, this list of conditions and the following disclaimer.
      10                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      11                 :            :  *    notice, this list of conditions and the following disclaimer in the
      12                 :            :  *    documentation and/or other materials provided with the distribution.
      13                 :            :  *
      14                 :            :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      15                 :            :  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      16                 :            :  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
      17                 :            :  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
      18                 :            :  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      19                 :            :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      20                 :            :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      21                 :            :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      22                 :            :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      23                 :            :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      24                 :            :  */
      25                 :            : 
      26                 :            : #include "includes.h"
      27                 :            : 
      28                 :            : #include <sys/types.h>
      29                 :            : #include <sys/uio.h>
      30                 :            : 
      31                 :            : #include <errno.h>
      32                 :            : #include <stdio.h>
      33                 :            : #include <string.h>
      34                 :            : #include <unistd.h>
      35                 :            : #include <stdarg.h>
      36                 :            : 
      37                 :            : #include "buffer.h"
      38                 :            : #include "log.h"
      39                 :            : #include "atomicio.h"
      40                 :            : #include "msg.h"
      41                 :            : #include "misc.h"
      42                 :            : 
      43                 :            : int
      44                 :        104 : ssh_msg_send(int fd, u_char type, Buffer *m)
      45                 :            : {
      46                 :            :         u_char buf[5];
      47                 :        104 :         u_int mlen = buffer_len(m);
      48                 :            : 
      49                 :        104 :         debug3("ssh_msg_send: type %u", (unsigned int)type & 0xff);
      50                 :            : 
      51                 :        104 :         put_u32(buf, mlen + 1);
      52                 :        104 :         buf[4] = type;          /* 1st byte of payload is mesg-type */
      53         [ -  + ]:        104 :         if (atomicio(vwrite, fd, buf, sizeof(buf)) != sizeof(buf)) {
      54                 :          0 :                 error("ssh_msg_send: write");
      55                 :          0 :                 return (-1);
      56                 :            :         }
      57         [ -  + ]:        104 :         if (atomicio(vwrite, fd, buffer_ptr(m), mlen) != mlen) {
      58                 :          0 :                 error("ssh_msg_send: write");
      59                 :          0 :                 return (-1);
      60                 :            :         }
      61                 :            :         return (0);
      62                 :            : }
      63                 :            : 
      64                 :            : int
      65                 :        103 : ssh_msg_recv(int fd, Buffer *m)
      66                 :            : {
      67                 :            :         u_char buf[4];
      68                 :            :         u_int msg_len;
      69                 :            : 
      70                 :        103 :         debug3("ssh_msg_recv entering");
      71                 :            : 
      72         [ -  + ]:        103 :         if (atomicio(read, fd, buf, sizeof(buf)) != sizeof(buf)) {
      73         [ #  # ]:          0 :                 if (errno != EPIPE)
      74                 :          0 :                         error("ssh_msg_recv: read: header");
      75                 :            :                 return (-1);
      76                 :            :         }
      77                 :        103 :         msg_len = get_u32(buf);
      78         [ -  + ]:        103 :         if (msg_len > 256 * 1024) {
      79                 :          0 :                 error("ssh_msg_recv: read: bad msg_len %u", msg_len);
      80                 :          0 :                 return (-1);
      81                 :            :         }
      82                 :        103 :         buffer_clear(m);
      83                 :        103 :         buffer_append_space(m, msg_len);
      84         [ -  + ]:        103 :         if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) {
      85                 :          0 :                 error("ssh_msg_recv: read: %s", strerror(errno));
      86                 :          0 :                 return (-1);
      87                 :            :         }
      88                 :            :         return (0);
      89                 :            : }