dispatch.c

   1 /* $OpenBSD: dispatch.c,v 1.20 2006/07/23 01:11:05 stevesk 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 <signal.h>
  28
  29 #include "ssh1.h"
  30 #include "ssh2.h"
  31 #include "log.h"
  32 #include "dispatch.h"
  33 #include "packet.h"
  34 #include "compat.h"
  35
  36 #define DISPATCH_MIN    0
  37 #define DISPATCH_MAX    255
  38
  39 dispatch_fn *dispatch[DISPATCH_MAX];
  40
  41 void
  42 dispatch_protocol_error(int type, u_int32_t seq, void *ctxt)
  43 {
  44         logit("dispatch_protocol_error: type %d seq %u", type, seq);
  45         if (!compat20)
  46                 fatal("protocol error");
  47         packet_start(SSH2_MSG_UNIMPLEMENTED);
  48         packet_put_int(seq);
  49         packet_send();
  50         packet_write_wait();
  51 }
  52 void
  53 dispatch_protocol_ignore(int type, u_int32_t seq, void *ctxt)
  54 {
  55         logit("dispatch_protocol_ignore: type %d seq %u", type, seq);
  56 }
  57 void
  58 dispatch_init(dispatch_fn *dflt)
  59 {
  60         u_int i;
  61         for (i = 0; i < DISPATCH_MAX; i++)
  62                 dispatch[i] = dflt;
  63 }
  64 void
  65 dispatch_range(u_int from, u_int to, dispatch_fn *fn)
  66 {
  67         u_int i;
  68
  69         for (i = from; i <= to; i++) {
  70                 if (i >= DISPATCH_MAX)
  71                         break;
  72                 dispatch[i] = fn;
  73         }
  74 }
  75 void
  76 dispatch_set(int type, dispatch_fn *fn)
  77 {
  78         dispatch[type] = fn;
  79 }
  80 void
  81 dispatch_run(int mode, volatile sig_atomic_t *done, void *ctxt)
  82 {
  83         for (;;) {
  84                 int type;
  85                 u_int32_t seqnr;
  86
  87                 if (mode == DISPATCH_BLOCK) {
  88                         type = packet_read_seqnr(&seqnr);
  89                 } else {
  90                         type = packet_read_poll_seqnr(&seqnr);
  91                         if (type == SSH_MSG_NONE)
  92                                 return;
  93                 }
  94                 if (type > 0 && type < DISPATCH_MAX && dispatch[type] != NULL)
  95                         (*dispatch[type])(type, seqnr, ctxt);
  96                 else
  97                         packet_disconnect("protocol error: rcvd type %d", type);
  98                 if (done != NULL && *done)
  99                         return;
 100         }
 101 }