Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1 | /* |
Damien Miller | b51ed39 | 2002-01-22 23:29:03 +1100 | [diff] [blame] | 2 | * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * 1. Redistributions of source code must retain the above copyright |
| 8 | * notice, this list of conditions and the following disclaimer. |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer in the |
| 11 | * documentation and/or other materials provided with the distribution. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 23 | */ |
| 24 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 25 | #include "includes.h" |
Ben Lindstrom | 05efee1 | 2002-06-09 20:20:58 +0000 | [diff] [blame] | 26 | RCSID("$OpenBSD: nchan.c,v 1.46 2002/06/09 13:32:01 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 28 | #include "ssh1.h" |
| 29 | #include "ssh2.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 30 | #include "buffer.h" |
| 31 | #include "packet.h" |
| 32 | #include "channels.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 33 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 34 | #include "log.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 35 | |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 36 | /* |
| 37 | * SSH Protocol 1.5 aka New Channel Protocol |
| 38 | * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored. |
| 39 | * Written by Markus Friedl in October 1999 |
| 40 | * |
| 41 | * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the |
| 42 | * tear down of channels: |
| 43 | * |
| 44 | * 1.3: strict request-ack-protocol: |
| 45 | * CLOSE -> |
| 46 | * <- CLOSE_CONFIRM |
| 47 | * |
| 48 | * 1.5: uses variations of: |
| 49 | * IEOF -> |
| 50 | * <- OCLOSE |
| 51 | * <- IEOF |
| 52 | * OCLOSE -> |
| 53 | * i.e. both sides have to close the channel |
| 54 | * |
| 55 | * 2.0: the EOF messages are optional |
| 56 | * |
| 57 | * See the debugging output from 'ssh -v' and 'sshd -d' of |
| 58 | * ssh-1.2.27 as an example. |
| 59 | * |
| 60 | */ |
Kevin Steves | c3422eb | 2001-09-20 19:33:33 +0000 | [diff] [blame] | 61 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 62 | /* functions manipulating channel states */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 63 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 64 | * EVENTS update channel input/output states execute ACTIONS |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 65 | */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 66 | /* |
| 67 | * ACTIONS: should never update the channel states |
| 68 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 69 | static void chan_send_ieof1(Channel *); |
| 70 | static void chan_send_oclose1(Channel *); |
| 71 | static void chan_send_close2(Channel *); |
| 72 | static void chan_send_eof2(Channel *); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 73 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 74 | /* helper */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 75 | static void chan_shutdown_write(Channel *); |
| 76 | static void chan_shutdown_read(Channel *); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 77 | |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 78 | static char *ostates[] = { "open", "drain", "wait_ieof", "closed" }; |
| 79 | static char *istates[] = { "open", "drain", "wait_oclose", "closed" }; |
| 80 | |
| 81 | static void |
| 82 | chan_set_istate(Channel *c, u_int next) |
| 83 | { |
| 84 | if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED) |
| 85 | fatal("chan_set_istate: bad state %d -> %d", c->istate, next); |
| 86 | debug("channel %d: input %s -> %s", c->self, istates[c->istate], |
| 87 | istates[next]); |
| 88 | c->istate = next; |
| 89 | } |
| 90 | static void |
| 91 | chan_set_ostate(Channel *c, u_int next) |
| 92 | { |
| 93 | if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED) |
| 94 | fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next); |
| 95 | debug("channel %d: output %s -> %s", c->self, ostates[c->ostate], |
| 96 | ostates[next]); |
| 97 | c->ostate = next; |
| 98 | } |
| 99 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 100 | /* |
| 101 | * SSH1 specific implementation of event functions |
| 102 | */ |
| 103 | |
| 104 | static void |
| 105 | chan_rcvd_oclose1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 106 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 107 | debug("channel %d: rcvd oclose", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 108 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 109 | case CHAN_INPUT_WAIT_OCLOSE: |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 110 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 111 | break; |
| 112 | case CHAN_INPUT_OPEN: |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 113 | chan_shutdown_read(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 114 | chan_send_ieof1(c); |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 115 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 116 | break; |
| 117 | case CHAN_INPUT_WAIT_DRAIN: |
| 118 | /* both local read_failed and remote write_failed */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 119 | chan_send_ieof1(c); |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 120 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 121 | break; |
| 122 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 123 | error("channel %d: protocol error: rcvd_oclose for istate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 124 | c->self, c->istate); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 125 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 126 | } |
| 127 | } |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 128 | void |
| 129 | chan_read_failed(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 130 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 131 | debug("channel %d: read failed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 132 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 133 | case CHAN_INPUT_OPEN: |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 134 | chan_shutdown_read(c); |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 135 | chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 136 | break; |
| 137 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 138 | error("channel %d: chan_read_failed for istate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 139 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 140 | break; |
| 141 | } |
| 142 | } |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 143 | void |
| 144 | chan_ibuf_empty(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 145 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 146 | debug("channel %d: ibuf empty", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 147 | if (buffer_len(&c->input)) { |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 148 | error("channel %d: chan_ibuf_empty for non empty buffer", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 149 | c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 150 | return; |
| 151 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 152 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 153 | case CHAN_INPUT_WAIT_DRAIN: |
Damien Miller | fcfc43b | 2002-01-22 23:27:45 +1100 | [diff] [blame] | 154 | if (compat20) { |
| 155 | if (!(c->flags & CHAN_CLOSE_SENT)) |
| 156 | chan_send_eof2(c); |
| 157 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
| 158 | } else { |
| 159 | chan_send_ieof1(c); |
| 160 | chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE); |
| 161 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | break; |
| 163 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 164 | error("channel %d: chan_ibuf_empty for istate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 165 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 166 | break; |
| 167 | } |
| 168 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 169 | static void |
| 170 | chan_rcvd_ieof1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 171 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 172 | debug("channel %d: rcvd ieof", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 173 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 174 | case CHAN_OUTPUT_OPEN: |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 175 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 176 | break; |
| 177 | case CHAN_OUTPUT_WAIT_IEOF: |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 178 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 179 | break; |
| 180 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 181 | error("channel %d: protocol error: rcvd_ieof for ostate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 182 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 183 | break; |
| 184 | } |
| 185 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 186 | static void |
| 187 | chan_write_failed1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 188 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 189 | debug("channel %d: write failed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 190 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 191 | case CHAN_OUTPUT_OPEN: |
Damien Miller | 89a9232 | 2002-01-22 23:27:28 +1100 | [diff] [blame] | 192 | chan_shutdown_write(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 193 | chan_send_oclose1(c); |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 194 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 195 | break; |
| 196 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 89a9232 | 2002-01-22 23:27:28 +1100 | [diff] [blame] | 197 | chan_shutdown_write(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 198 | chan_send_oclose1(c); |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 199 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 200 | break; |
| 201 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 202 | error("channel %d: chan_write_failed for ostate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 203 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 204 | break; |
| 205 | } |
| 206 | } |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 207 | void |
| 208 | chan_obuf_empty(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 209 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 210 | debug("channel %d: obuf empty", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 211 | if (buffer_len(&c->output)) { |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 212 | error("channel %d: chan_obuf_empty for non empty buffer", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 213 | c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 214 | return; |
| 215 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 216 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 217 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 89a9232 | 2002-01-22 23:27:28 +1100 | [diff] [blame] | 218 | chan_shutdown_write(c); |
Damien Miller | fcfc43b | 2002-01-22 23:27:45 +1100 | [diff] [blame] | 219 | if (!compat20) |
| 220 | chan_send_oclose1(c); |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 221 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 222 | break; |
| 223 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 224 | error("channel %d: internal error: obuf_empty for ostate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 225 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 226 | break; |
| 227 | } |
| 228 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 229 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 230 | chan_send_ieof1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 231 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 232 | debug("channel %d: send ieof", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 233 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 234 | case CHAN_INPUT_OPEN: |
| 235 | case CHAN_INPUT_WAIT_DRAIN: |
| 236 | packet_start(SSH_MSG_CHANNEL_INPUT_EOF); |
| 237 | packet_put_int(c->remote_id); |
| 238 | packet_send(); |
| 239 | break; |
| 240 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 241 | error("channel %d: cannot send ieof for istate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 242 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 243 | break; |
| 244 | } |
| 245 | } |
| 246 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 247 | chan_send_oclose1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 248 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 249 | debug("channel %d: send oclose", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 250 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 251 | case CHAN_OUTPUT_OPEN: |
| 252 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 253 | buffer_clear(&c->output); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 254 | packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); |
| 255 | packet_put_int(c->remote_id); |
| 256 | packet_send(); |
| 257 | break; |
| 258 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 259 | error("channel %d: cannot send oclose for ostate %d", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 260 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 261 | break; |
| 262 | } |
| 263 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 264 | |
| 265 | /* |
| 266 | * the same for SSH2 |
| 267 | */ |
| 268 | static void |
Damien Miller | ebc11d3 | 2002-01-22 23:28:13 +1100 | [diff] [blame] | 269 | chan_rcvd_close2(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 270 | { |
| 271 | debug("channel %d: rcvd close", c->self); |
| 272 | if (c->flags & CHAN_CLOSE_RCVD) |
| 273 | error("channel %d: protocol error: close rcvd twice", c->self); |
| 274 | c->flags |= CHAN_CLOSE_RCVD; |
| 275 | if (c->type == SSH_CHANNEL_LARVAL) { |
| 276 | /* tear down larval channels immediately */ |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 277 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
| 278 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 279 | return; |
| 280 | } |
| 281 | switch (c->ostate) { |
| 282 | case CHAN_OUTPUT_OPEN: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 283 | /* |
| 284 | * wait until a data from the channel is consumed if a CLOSE |
| 285 | * is received |
| 286 | */ |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 287 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 288 | break; |
| 289 | } |
| 290 | switch (c->istate) { |
| 291 | case CHAN_INPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 292 | chan_shutdown_read(c); |
Damien Miller | ebc11d3 | 2002-01-22 23:28:13 +1100 | [diff] [blame] | 293 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 294 | break; |
| 295 | case CHAN_INPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 296 | chan_send_eof2(c); |
Damien Miller | ebc11d3 | 2002-01-22 23:28:13 +1100 | [diff] [blame] | 297 | chan_set_istate(c, CHAN_INPUT_CLOSED); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 298 | break; |
| 299 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 300 | } |
| 301 | static void |
Damien Miller | ebc11d3 | 2002-01-22 23:28:13 +1100 | [diff] [blame] | 302 | chan_rcvd_eof2(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 303 | { |
| 304 | debug("channel %d: rcvd eof", c->self); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 305 | c->flags |= CHAN_EOF_RCVD; |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 306 | if (c->ostate == CHAN_OUTPUT_OPEN) |
| 307 | chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 308 | } |
| 309 | static void |
| 310 | chan_write_failed2(Channel *c) |
| 311 | { |
| 312 | debug("channel %d: write failed", c->self); |
| 313 | switch (c->ostate) { |
| 314 | case CHAN_OUTPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 315 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 316 | chan_shutdown_write(c); |
Damien Miller | abea8ee | 2002-01-22 23:27:11 +1100 | [diff] [blame] | 317 | chan_set_ostate(c, CHAN_OUTPUT_CLOSED); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 318 | break; |
| 319 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 320 | error("channel %d: chan_write_failed for ostate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 321 | c->self, c->ostate); |
| 322 | break; |
| 323 | } |
| 324 | } |
| 325 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 326 | chan_send_eof2(Channel *c) |
| 327 | { |
| 328 | debug("channel %d: send eof", c->self); |
| 329 | switch (c->istate) { |
| 330 | case CHAN_INPUT_WAIT_DRAIN: |
| 331 | packet_start(SSH2_MSG_CHANNEL_EOF); |
| 332 | packet_put_int(c->remote_id); |
| 333 | packet_send(); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 334 | c->flags |= CHAN_EOF_SENT; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 335 | break; |
| 336 | default: |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 337 | error("channel %d: cannot send eof for istate %d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 338 | c->self, c->istate); |
| 339 | break; |
| 340 | } |
| 341 | } |
| 342 | static void |
| 343 | chan_send_close2(Channel *c) |
| 344 | { |
| 345 | debug("channel %d: send close", c->self); |
| 346 | if (c->ostate != CHAN_OUTPUT_CLOSED || |
| 347 | c->istate != CHAN_INPUT_CLOSED) { |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 348 | error("channel %d: cannot send close for istate/ostate %d/%d", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 349 | c->self, c->istate, c->ostate); |
| 350 | } else if (c->flags & CHAN_CLOSE_SENT) { |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 351 | error("channel %d: already sent close", c->self); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 352 | } else { |
| 353 | packet_start(SSH2_MSG_CHANNEL_CLOSE); |
| 354 | packet_put_int(c->remote_id); |
| 355 | packet_send(); |
| 356 | c->flags |= CHAN_CLOSE_SENT; |
| 357 | } |
| 358 | } |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 359 | |
| 360 | /* shared */ |
| 361 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 362 | void |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 363 | chan_rcvd_ieof(Channel *c) |
| 364 | { |
| 365 | if (compat20) |
| 366 | chan_rcvd_eof2(c); |
| 367 | else |
| 368 | chan_rcvd_ieof1(c); |
Damien Miller | 73f1074 | 2002-01-22 23:34:52 +1100 | [diff] [blame] | 369 | if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN && |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 370 | buffer_len(&c->output) == 0 && |
| 371 | !CHANNEL_EFD_OUTPUT_ACTIVE(c)) |
Damien Miller | 73f1074 | 2002-01-22 23:34:52 +1100 | [diff] [blame] | 372 | chan_obuf_empty(c); |
Damien Miller | 5144df9 | 2002-01-22 23:28:45 +1100 | [diff] [blame] | 373 | } |
| 374 | void |
| 375 | chan_rcvd_oclose(Channel *c) |
| 376 | { |
| 377 | if (compat20) |
| 378 | chan_rcvd_close2(c); |
| 379 | else |
| 380 | chan_rcvd_oclose1(c); |
| 381 | } |
| 382 | void |
| 383 | chan_write_failed(Channel *c) |
| 384 | { |
| 385 | if (compat20) |
| 386 | chan_write_failed2(c); |
| 387 | else |
| 388 | chan_write_failed1(c); |
| 389 | } |
| 390 | |
| 391 | void |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 392 | chan_mark_dead(Channel *c) |
| 393 | { |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 394 | c->type = SSH_CHANNEL_ZOMBIE; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 395 | } |
| 396 | |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 397 | int |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 398 | chan_is_dead(Channel *c, int send) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 399 | { |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 400 | if (c->type == SSH_CHANNEL_ZOMBIE) { |
| 401 | debug("channel %d: zombie", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 402 | return 1; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 403 | } |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 404 | if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) |
| 405 | return 0; |
| 406 | if (!compat20) { |
| 407 | debug("channel %d: is dead", c->self); |
| 408 | return 1; |
| 409 | } |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 410 | if ((datafellows & SSH_BUG_EXTEOF) && |
| 411 | c->extended_usage == CHAN_EXTENDED_WRITE && |
| 412 | c->efd != -1 && |
| 413 | buffer_len(&c->extended) > 0) { |
Ben Lindstrom | 5a6abda | 2002-06-09 19:41:48 +0000 | [diff] [blame] | 414 | debug2("channel %d: active efd: %d len %d", |
| 415 | c->self, c->efd, buffer_len(&c->extended)); |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 416 | return 0; |
| 417 | } |
| 418 | if (!(c->flags & CHAN_CLOSE_SENT)) { |
| 419 | if (send) { |
| 420 | chan_send_close2(c); |
| 421 | } else { |
| 422 | /* channel would be dead if we sent a close */ |
| 423 | if (c->flags & CHAN_CLOSE_RCVD) { |
| 424 | debug("channel %d: almost dead", |
| 425 | c->self); |
| 426 | return 1; |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 427 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 428 | } |
Ben Lindstrom | cf15944 | 2002-03-26 03:26:24 +0000 | [diff] [blame] | 429 | } |
| 430 | if ((c->flags & CHAN_CLOSE_SENT) && |
| 431 | (c->flags & CHAN_CLOSE_RCVD)) { |
| 432 | debug("channel %d: is dead", c->self); |
| 433 | return 1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 434 | } |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 435 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 436 | } |
| 437 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 438 | /* helper */ |
| 439 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 440 | chan_shutdown_write(Channel *c) |
| 441 | { |
Damien Miller | 76765c0 | 2002-01-22 23:21:15 +1100 | [diff] [blame] | 442 | buffer_clear(&c->output); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 443 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
| 444 | return; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 445 | /* shutdown failure is allowed if write failed already */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 446 | debug("channel %d: close_write", c->self); |
| 447 | if (c->sock != -1) { |
| 448 | if (shutdown(c->sock, SHUT_WR) < 0) |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 449 | debug("channel %d: chan_shutdown_write: " |
| 450 | "shutdown() failed for fd%d: %.100s", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 451 | c->self, c->sock, strerror(errno)); |
| 452 | } else { |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 453 | if (channel_close_fd(&c->wfd) < 0) |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 454 | log("channel %d: chan_shutdown_write: " |
| 455 | "close() failed for fd%d: %.100s", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 456 | c->self, c->wfd, strerror(errno)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 457 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 458 | } |
| 459 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 460 | chan_shutdown_read(Channel *c) |
| 461 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 462 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
| 463 | return; |
| 464 | debug("channel %d: close_read", c->self); |
| 465 | if (c->sock != -1) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 466 | /* |
Damien Miller | 0f091bd | 2000-08-07 15:47:48 +1000 | [diff] [blame] | 467 | * shutdown(sock, SHUT_READ) may return ENOTCONN if the |
| 468 | * write side has been closed already. (bug on Linux) |
Kevin Steves | 871f662 | 2001-09-18 16:08:24 +0000 | [diff] [blame] | 469 | * HP-UX may return ENOTCONN also. |
Damien Miller | 0f091bd | 2000-08-07 15:47:48 +1000 | [diff] [blame] | 470 | */ |
| 471 | if (shutdown(c->sock, SHUT_RD) < 0 |
Kevin Steves | 871f662 | 2001-09-18 16:08:24 +0000 | [diff] [blame] | 472 | && errno != ENOTCONN) |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 473 | error("channel %d: chan_shutdown_read: " |
| 474 | "shutdown() failed for fd%d [i%d o%d]: %.100s", |
| 475 | c->self, c->sock, c->istate, c->ostate, |
Kevin Steves | c3422eb | 2001-09-20 19:33:33 +0000 | [diff] [blame] | 476 | strerror(errno)); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 477 | } else { |
Ben Lindstrom | 16d29d5 | 2001-07-18 16:01:46 +0000 | [diff] [blame] | 478 | if (channel_close_fd(&c->rfd) < 0) |
Ben Lindstrom | 3b670d0 | 2001-06-09 00:57:39 +0000 | [diff] [blame] | 479 | log("channel %d: chan_shutdown_read: " |
| 480 | "close() failed for fd%d: %.100s", |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 481 | c->self, c->rfd, strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 482 | } |
| 483 | } |