/* $OpenBSD: dispatch.c,v 1.33 2023/03/05 05:34:09 dtucker Exp $ */

/*

 * Copyright (c) 2000 Markus Friedl.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "includes.h"

#include <sys/types.h>

#include <signal.h>

#include <stdarg.h>

#include "ssh2.h"

#include "log.h"

#include "dispatch.h"

#include "packet.h"

#include "ssherr.h"

int

dispatch_protocol_error(int type, u_int32_t seq, struct ssh *ssh)

{

  int r;

  logit("dispatch_protocol_error: type %d seq %u", type, seq);

  if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 ||

      (r = sshpkt_put_u32(ssh, seq)) != 0 ||

      (r = sshpkt_send(ssh)) != 0 ||

      (r = ssh_packet_write_wait(ssh)) != 0)

    sshpkt_fatal(ssh, r, "%s", __func__);

  return 0;

}

int

dispatch_protocol_ignore(int type, u_int32_t seq, struct ssh *ssh)

{

  logit("dispatch_protocol_ignore: type %d seq %u", type, seq);

  return 0;

}

void

ssh_dispatch_init(struct ssh *ssh, dispatch_fn *dflt)

{

  u_int i;

  for (i = 0; i < DISPATCH_MAX; i++)

    ssh->dispatch[i] = dflt;

}

void

ssh_dispatch_range(struct ssh *ssh, u_int from, u_int to, dispatch_fn *fn)

{

  u_int i;

  for (i = from; i <= to; i++) {

    if (i >= DISPATCH_MAX)

      break;

    ssh->dispatch[i] = fn;

  }

}

void

ssh_dispatch_set(struct ssh *ssh, int type, dispatch_fn *fn)

{

  ssh->dispatch[type] = fn;

}

int

ssh_dispatch_run(struct ssh *ssh, int mode, volatile sig_atomic_t *done)

{

  int r;

  u_char type;

  u_int32_t seqnr;

  for (;;) {

    if (mode == DISPATCH_BLOCK) {

      r = ssh_packet_read_seqnr(ssh, &type, &seqnr);

      if (r != 0)

        return r;

    } else {

      r = ssh_packet_read_poll_seqnr(ssh, &type, &seqnr);

      if (r != 0)

        return r;

      if (type == SSH_MSG_NONE)

        return 0;

    }

    if (type > 0 && type < DISPATCH_MAX &&

        ssh->dispatch[type] != NULL) {

      if (ssh->dispatch_skip_packets) {

        debug2("skipped packet (type %u)", type);

        ssh->dispatch_skip_packets--;

        continue;

      }

      r = (*ssh->dispatch[type])(type, seqnr, ssh);

      if (r != 0)

        return r;

    } else {

      r = sshpkt_disconnect(ssh,

          "protocol error: rcvd type %d", type);

      if (r != 0)

        return r;

      return SSH_ERR_DISCONNECTED;

    }

    if (done != NULL && *done)

      return 0;

  }

}

void

ssh_dispatch_run_fatal(struct ssh *ssh, int mode, volatile sig_atomic_t *done)

{

  int r;

  if ((r = ssh_dispatch_run(ssh, mode, done)) != 0)

    sshpkt_fatal(ssh, r, "%s", __func__);

}