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Diffstat (limited to '')
-rw-r--r-- | dispatch.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/dispatch.c b/dispatch.c new file mode 100644 index 0000000..6e4c501 --- /dev/null +++ b/dispatch.c @@ -0,0 +1,135 @@ +/* $OpenBSD: dispatch.c,v 1.32 2019/01/19 21:33:13 djm 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 "compat.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__); +} |