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-rw-r--r--dispatch.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/dispatch.c b/dispatch.c
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+/* $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__);
+}