Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 1 | /* $OpenBSD: dispatch.c,v 1.26 2015/02/12 20:34:19 dtucker Exp $ */ |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 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 | */ |
| 25 | |
| 26 | #include "includes.h" |
| 27 | |
| 28 | #include <sys/types.h> |
| 29 | |
| 30 | #include <signal.h> |
| 31 | #include <stdarg.h> |
| 32 | |
| 33 | #include "ssh1.h" |
| 34 | #include "ssh2.h" |
| 35 | #include "log.h" |
| 36 | #include "dispatch.h" |
| 37 | #include "packet.h" |
| 38 | #include "compat.h" |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 39 | #include "ssherr.h" |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 40 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 41 | int |
| 42 | dispatch_protocol_error(int type, u_int32_t seq, void *ctx) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 43 | { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 44 | struct ssh *ssh = active_state; /* XXX */ |
| 45 | int r; |
| 46 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 47 | logit("dispatch_protocol_error: type %d seq %u", type, seq); |
| 48 | if (!compat20) |
| 49 | fatal("protocol error"); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 50 | if ((r = sshpkt_start(ssh, SSH2_MSG_UNIMPLEMENTED)) != 0 || |
| 51 | (r = sshpkt_put_u32(ssh, seq)) != 0 || |
| 52 | (r = sshpkt_send(ssh)) != 0 || |
| 53 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 54 | sshpkt_fatal(ssh, __func__, r); |
| 55 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 56 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 57 | |
| 58 | int |
| 59 | dispatch_protocol_ignore(int type, u_int32_t seq, void *ssh) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 60 | { |
| 61 | logit("dispatch_protocol_ignore: type %d seq %u", type, seq); |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 62 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 63 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 64 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 65 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 66 | ssh_dispatch_init(struct ssh *ssh, dispatch_fn *dflt) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 67 | { |
| 68 | u_int i; |
| 69 | for (i = 0; i < DISPATCH_MAX; i++) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 70 | ssh->dispatch[i] = dflt; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 71 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 72 | |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 73 | void |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 74 | ssh_dispatch_range(struct ssh *ssh, u_int from, u_int to, dispatch_fn *fn) |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 75 | { |
| 76 | u_int i; |
| 77 | |
| 78 | for (i = from; i <= to; i++) { |
| 79 | if (i >= DISPATCH_MAX) |
| 80 | break; |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 81 | ssh->dispatch[i] = fn; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 82 | } |
| 83 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 84 | |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 85 | void |
| 86 | ssh_dispatch_set(struct ssh *ssh, int type, dispatch_fn *fn) |
| 87 | { |
| 88 | ssh->dispatch[type] = fn; |
| 89 | } |
| 90 | |
| 91 | int |
| 92 | ssh_dispatch_run(struct ssh *ssh, int mode, volatile sig_atomic_t *done, |
| 93 | void *ctxt) |
| 94 | { |
| 95 | int r; |
| 96 | u_char type; |
| 97 | u_int32_t seqnr; |
| 98 | |
| 99 | for (;;) { |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 100 | if (mode == DISPATCH_BLOCK) { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 101 | r = ssh_packet_read_seqnr(ssh, &type, &seqnr); |
| 102 | if (r != 0) |
| 103 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 104 | } else { |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 105 | r = ssh_packet_read_poll_seqnr(ssh, &type, &seqnr); |
| 106 | if (r != 0) |
| 107 | return r; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 108 | if (type == SSH_MSG_NONE) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 109 | return 0; |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 110 | } |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 111 | if (type > 0 && type < DISPATCH_MAX && |
| 112 | ssh->dispatch[type] != NULL) { |
| 113 | if (ssh->dispatch_skip_packets) { |
| 114 | debug2("skipped packet (type %u)", type); |
| 115 | ssh->dispatch_skip_packets--; |
| 116 | continue; |
| 117 | } |
| 118 | /* XXX 'ssh' will replace 'ctxt' later */ |
| 119 | r = (*ssh->dispatch[type])(type, seqnr, ctxt); |
| 120 | if (r != 0) |
| 121 | return r; |
| 122 | } else { |
| 123 | r = sshpkt_disconnect(ssh, |
| 124 | "protocol error: rcvd type %d", type); |
| 125 | if (r != 0) |
| 126 | return r; |
| 127 | return SSH_ERR_DISCONNECTED; |
| 128 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 129 | if (done != NULL && *done) |
Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame^] | 130 | return 0; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | void |
| 135 | ssh_dispatch_run_fatal(struct ssh *ssh, int mode, volatile sig_atomic_t *done, |
| 136 | void *ctxt) |
| 137 | { |
| 138 | int r; |
| 139 | |
| 140 | if ((r = ssh_dispatch_run(ssh, mode, done, ctxt)) != 0) { |
| 141 | switch (r) { |
| 142 | case SSH_ERR_CONN_CLOSED: |
| 143 | logit("Connection closed by %.200s", |
| 144 | ssh_remote_ipaddr(ssh)); |
| 145 | cleanup_exit(255); |
| 146 | case SSH_ERR_CONN_TIMEOUT: |
| 147 | logit("Connection to %.200s timed out while " |
| 148 | "waiting to read", ssh_remote_ipaddr(ssh)); |
| 149 | cleanup_exit(255); |
| 150 | case SSH_ERR_DISCONNECTED: |
| 151 | logit("Disconnected from %.200s", |
| 152 | ssh_remote_ipaddr(ssh)); |
| 153 | cleanup_exit(255); |
| 154 | default: |
| 155 | fatal("%s: %s", __func__, ssh_err(r)); |
| 156 | } |
Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame] | 157 | } |
| 158 | } |