dispatch.c

   1 /* $OpenBSD: dispatch.c,v 1.19 2006/04/20 09:27:09 djm Exp $ */
   2 /*
   3  * Copyright (c) 2000 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 #include "includes.h"
  26
  27 #include "ssh1.h"
  28 #include "ssh2.h"
  29 #include "log.h"
  30 #include "dispatch.h"
  31 #include "packet.h"
  32 #include "compat.h"
  33
  34 #define DISPATCH_MIN    0
  35 #define DISPATCH_MAX    255
  36
  37 dispatch_fn *dispatch[DISPATCH_MAX];
  38
  39 void
  40 dispatch_protocol_error(int type, u_int32_t seq, void *ctxt)
  41 {
  42         logit("dispatch_protocol_error: type %d seq %u", type, seq);
  43         if (!compat20)
  44                 fatal("protocol error");
  45         packet_start(SSH2_MSG_UNIMPLEMENTED);
  46         packet_put_int(seq);
  47         packet_send();
  48         packet_write_wait();
  49 }
  50 void
  51 dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt)
  52 {
  53         logit("dispatch_protocol_ignore: type %d seq %u", type, seq);
  54 }
  55 void
  56 dispatch_init(dispatch_fn *dflt)
  57 {
  58         u_int i;
  59         for (i = 0; i < DISPATCH_MAX; i++)
  60                 dispatch[i] = dflt;
  61 }
  62 void
  63 dispatch_range(u_int from, u_int to, dispatch_fn *fn)
  64 {
  65         u_int i;
  66
  67         for (i = from; i <= to; i++) {
  68                 if (i >= DISPATCH_MAX)
  69                         break;
  70                 dispatch[i] = fn;
  71         }
  72 }
  73 void
  74 dispatch_set(int type, dispatch_fn *fn)
  75 {
  76         dispatch[type] = fn;
  77 }
  78 void
  79 dispatch_run(int mode, volatile sig_atomic_t *done, void *ctxt)
  80 {
  81         for (;;) {
  82                 int type;
  83                 u_int32_t seqnr;
  84
  85                 if (mode == DISPATCH_BLOCK) {
  86                         type = packet_read_seqnr(&seqnr);
  87                 } else {
  88                         type = packet_read_poll_seqnr(&seqnr);
  89                         if (type == SSH_MSG_NONE)
  90                                 return;
  91                 }
  92                 if (type > 0 && type < DISPATCH_MAX && dispatch[type] != NULL)
  93                         (*dispatch[type])(type, seqnr, ctxt);
  94                 else
  95                         packet_disconnect("protocol error: rcvd type %d", type);
  96                 if (done != NULL && *done)
  97                         return;
  98         }
  99 }