4f52dfbb8d
This completely removes client-side support for the SSH 1 protocol, which was already disabled in 12 but is still enabled in 11. For that reason, we will not be able to merge 7.6p1 or newer back to 11.
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/* $OpenBSD: dispatch.c,v 1.31 2017/05/31 07:00:13 markus 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 "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, struct ssh *ssh)
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{
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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 ((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, struct ssh *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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{
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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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r = (*ssh->dispatch[type])(type, seqnr, ssh);
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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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{
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int r;
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if ((r = ssh_dispatch_run(ssh, mode, done)) != 0)
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sshpkt_fatal(ssh, __func__, r);
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}
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