Annotation of src/usr.bin/ssh/dispatch.c, Revision 1.23
1.23 ! markus 1: /* $OpenBSD: dispatch.c,v 1.22 2008/10/31 15:05:34 stevesk Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: *
14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24: */
1.21 deraadt 25:
26: #include <sys/types.h>
1.20 stevesk 27:
28: #include <signal.h>
1.21 deraadt 29: #include <stdarg.h>
1.7 markus 30:
1.6 markus 31: #include "ssh1.h"
1.8 markus 32: #include "ssh2.h"
1.7 markus 33: #include "log.h"
1.1 markus 34: #include "dispatch.h"
35: #include "packet.h"
1.8 markus 36: #include "compat.h"
1.23 ! markus 37: #include "ssherr.h"
1.1 markus 38:
1.23 ! markus 39: int
! 40: dispatch_protocol_error(int type, u_int32_t seq, void *ctx)
! 41: {
! 42: struct ssh *ssh = active_state; /* XXX */
! 43: int r;
1.1 markus 44:
1.16 itojun 45: logit("dispatch_protocol_error: type %d seq %u", type, seq);
1.15 markus 46: if (!compat20)
47: fatal("protocol error");
1.23 ! markus 48: if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 ||
! 49: (r = sshpkt_put_u32(ssh, seq)) != 0 ||
! 50: (r = sshpkt_send(ssh)) != 0)
! 51: fatal("%s: %s", __func__, ssh_err(r));
! 52: ssh_packet_write_wait(ssh);
! 53: return 0;
1.15 markus 54: }
1.23 ! markus 55:
! 56: int
! 57: dispatch_protocol_ignore(int type, u_int32_t seq, void *ssh)
1.15 markus 58: {
1.16 itojun 59: logit("dispatch_protocol_ignore: type %d seq %u", type, seq);
1.23 ! markus 60: return 0;
1.1 markus 61: }
1.23 ! markus 62:
1.2 markus 63: void
1.23 ! markus 64: ssh_dispatch_init(struct ssh *ssh, dispatch_fn *dflt)
1.1 markus 65: {
1.15 markus 66: u_int i;
1.1 markus 67: for (i = 0; i < DISPATCH_MAX; i++)
1.23 ! markus 68: ssh->dispatch[i] = dflt;
1.15 markus 69: }
1.23 ! markus 70:
1.15 markus 71: void
1.23 ! markus 72: ssh_dispatch_range(struct ssh *ssh, u_int from, u_int to, dispatch_fn *fn)
1.15 markus 73: {
74: u_int i;
75:
76: for (i = from; i <= to; i++) {
77: if (i >= DISPATCH_MAX)
78: break;
1.23 ! markus 79: ssh->dispatch[i] = fn;
1.15 markus 80: }
1.1 markus 81: }
1.23 ! markus 82:
1.1 markus 83: void
1.23 ! markus 84: ssh_dispatch_set(struct ssh *ssh, int type, dispatch_fn *fn)
1.1 markus 85: {
1.23 ! markus 86: ssh->dispatch[type] = fn;
1.1 markus 87: }
1.23 ! markus 88:
! 89: int
! 90: ssh_dispatch_run(struct ssh *ssh, int mode, volatile sig_atomic_t *done,
! 91: void *ctxt)
! 92: {
! 93: int r;
! 94: u_char type;
! 95: u_int32_t seqnr;
! 96:
1.1 markus 97: for (;;) {
98: if (mode == DISPATCH_BLOCK) {
1.23 ! markus 99: r = ssh_packet_read_seqnr(ssh, &type, &seqnr);
! 100: if (r != 0)
! 101: return r;
1.1 markus 102: } else {
1.23 ! markus 103: r = ssh_packet_read_poll_seqnr(ssh, &type, &seqnr);
! 104: if (r != 0)
! 105: return r;
1.1 markus 106: if (type == SSH_MSG_NONE)
1.23 ! markus 107: return 0;
! 108: }
! 109: if (type > 0 && type < DISPATCH_MAX &&
! 110: ssh->dispatch[type] != NULL) {
! 111: if (ssh->dispatch_skip_packets) {
! 112: debug2("skipped packet (type %u)", type);
! 113: ssh->dispatch_skip_packets--;
! 114: continue;
! 115: }
! 116: /* XXX 'ssh' will replace 'ctxt' later */
! 117: r = (*ssh->dispatch[type])(type, seqnr, ctxt);
! 118: if (r != 0)
! 119: return r;
! 120: } else {
! 121: r = sshpkt_disconnect(ssh,
! 122: "protocol error: rcvd type %d", type);
! 123: if (r != 0)
! 124: return r;
! 125: return SSH_ERR_DISCONNECTED;
1.1 markus 126: }
127: if (done != NULL && *done)
1.23 ! markus 128: return 0;
1.1 markus 129: }
1.23 ! markus 130: }
! 131:
! 132: void
! 133: ssh_dispatch_run_fatal(struct ssh *ssh, int mode, volatile sig_atomic_t *done,
! 134: void *ctxt)
! 135: {
! 136: int r;
! 137:
! 138: if ((r = ssh_dispatch_run(ssh, mode, done, ctxt)) != 0)
! 139: fatal("%s: %s", __func__, ssh_err(r));
1.1 markus 140: }
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