/* $NetBSD: dispatch.c,v 1.10.2.1 2023/12/25 12:31:04 martin Exp $ */ /* $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" __RCSID("$NetBSD: dispatch.c,v 1.10.2.1 2023/12/25 12:31:04 martin Exp $"); #include #include #include #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__); }