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142 lines
3.7 KiB
142 lines
3.7 KiB
/* $OpenBSD: dispatch.c,v 1.27 2015/05/01 07:10:01 djm Exp $ */ |
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/* |
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* Copyright (c) 2000 Markus Friedl. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "includes.h" |
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#include <sys/types.h> |
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#include <signal.h> |
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#include <stdarg.h> |
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#include "ssh1.h" |
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#include "ssh2.h" |
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#include "log.h" |
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#include "dispatch.h" |
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#include "packet.h" |
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#include "compat.h" |
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#include "ssherr.h" |
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int |
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dispatch_protocol_error(int type, u_int32_t seq, void *ctx) |
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{ |
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struct ssh *ssh = active_state; /* XXX */ |
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int r; |
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logit("dispatch_protocol_error: type %d seq %u", type, seq); |
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if (!compat20) |
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fatal("protocol error"); |
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if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 || |
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(r = sshpkt_put_u32(ssh, seq)) != 0 || |
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(r = sshpkt_send(ssh)) != 0 || |
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(r = ssh_packet_write_wait(ssh)) != 0) |
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sshpkt_fatal(ssh, __func__, r); |
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return 0; |
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} |
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int |
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dispatch_protocol_ignore(int type, u_int32_t seq, void *ssh) |
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{ |
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logit("dispatch_protocol_ignore: type %d seq %u", type, seq); |
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return 0; |
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} |
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void |
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ssh_dispatch_init(struct ssh *ssh, dispatch_fn *dflt) |
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{ |
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u_int i; |
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for (i = 0; i < DISPATCH_MAX; i++) |
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ssh->dispatch[i] = dflt; |
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} |
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void |
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ssh_dispatch_range(struct ssh *ssh, u_int from, u_int to, dispatch_fn *fn) |
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{ |
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u_int i; |
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for (i = from; i <= to; i++) { |
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if (i >= DISPATCH_MAX) |
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break; |
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ssh->dispatch[i] = fn; |
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} |
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} |
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void |
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ssh_dispatch_set(struct ssh *ssh, int type, dispatch_fn *fn) |
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{ |
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ssh->dispatch[type] = fn; |
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} |
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int |
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ssh_dispatch_run(struct ssh *ssh, int mode, volatile sig_atomic_t *done, |
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void *ctxt) |
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{ |
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int r; |
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u_char type; |
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u_int32_t seqnr; |
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for (;;) { |
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if (mode == DISPATCH_BLOCK) { |
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r = ssh_packet_read_seqnr(ssh, &type, &seqnr); |
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if (r != 0) |
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return r; |
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} else { |
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r = ssh_packet_read_poll_seqnr(ssh, &type, &seqnr); |
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if (r != 0) |
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return r; |
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if (type == SSH_MSG_NONE) |
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return 0; |
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} |
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if (type > 0 && type < DISPATCH_MAX && |
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ssh->dispatch[type] != NULL) { |
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if (ssh->dispatch_skip_packets) { |
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debug2("skipped packet (type %u)", type); |
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ssh->dispatch_skip_packets--; |
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continue; |
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} |
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/* XXX 'ssh' will replace 'ctxt' later */ |
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r = (*ssh->dispatch[type])(type, seqnr, ctxt); |
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if (r != 0) |
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return r; |
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} else { |
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r = sshpkt_disconnect(ssh, |
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"protocol error: rcvd type %d", type); |
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if (r != 0) |
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return r; |
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return SSH_ERR_DISCONNECTED; |
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} |
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if (done != NULL && *done) |
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return 0; |
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} |
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} |
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void |
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ssh_dispatch_run_fatal(struct ssh *ssh, int mode, volatile sig_atomic_t *done, |
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void *ctxt) |
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{ |
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int r; |
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if ((r = ssh_dispatch_run(ssh, mode, done, ctxt)) != 0) |
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sshpkt_fatal(ssh, __func__, r); |
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}
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