Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1999 Markus Friedl. All rights reserved. |
| 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 | a6fc91e | 2001-06-09 00:44:44 +0000 | [diff] [blame^] | 26 | RCSID("$OpenBSD: nchan.c,v 1.28 2001/05/31 10:30:16 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" |
| 33 | #include "nchan.h" |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 34 | #include "compat.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 35 | #include "log.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 36 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 37 | /* functions manipulating channel states */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 38 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 39 | * EVENTS update channel input/output states execute ACTIONS |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 40 | */ |
| 41 | /* events concerning the INPUT from socket for channel (istate) */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 42 | chan_event_fn *chan_rcvd_oclose = NULL; |
| 43 | chan_event_fn *chan_read_failed = NULL; |
| 44 | chan_event_fn *chan_ibuf_empty = NULL; |
| 45 | /* events concerning the OUTPUT from channel for socket (ostate) */ |
| 46 | chan_event_fn *chan_rcvd_ieof = NULL; |
| 47 | chan_event_fn *chan_write_failed = NULL; |
| 48 | chan_event_fn *chan_obuf_empty = NULL; |
| 49 | /* |
| 50 | * ACTIONS: should never update the channel states |
| 51 | */ |
| 52 | static void chan_send_ieof1(Channel *c); |
| 53 | static void chan_send_oclose1(Channel *c); |
| 54 | static void chan_send_close2(Channel *c); |
| 55 | static void chan_send_eof2(Channel *c); |
| 56 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 57 | /* helper */ |
| 58 | static void chan_shutdown_write(Channel *c); |
| 59 | static void chan_shutdown_read(Channel *c); |
| 60 | |
| 61 | /* |
| 62 | * SSH1 specific implementation of event functions |
| 63 | */ |
| 64 | |
| 65 | static void |
| 66 | chan_rcvd_oclose1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 67 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 68 | debug("channel %d: rcvd oclose", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 69 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 70 | case CHAN_INPUT_WAIT_OCLOSE: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 71 | debug("channel %d: input wait_oclose -> closed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 72 | c->istate = CHAN_INPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 73 | break; |
| 74 | case CHAN_INPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 75 | debug("channel %d: input open -> closed", c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 76 | chan_shutdown_read(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 77 | chan_send_ieof1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 78 | c->istate = CHAN_INPUT_CLOSED; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 79 | break; |
| 80 | case CHAN_INPUT_WAIT_DRAIN: |
| 81 | /* both local read_failed and remote write_failed */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 82 | log("channel %d: input drain -> closed", c->self); |
| 83 | chan_send_ieof1(c); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 84 | c->istate = CHAN_INPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | break; |
| 86 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 87 | error("channel %d: protocol error: chan_rcvd_oclose for istate %d", |
| 88 | c->self, c->istate); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 89 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 90 | } |
| 91 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 92 | static void |
| 93 | chan_read_failed_12(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 94 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 95 | debug("channel %d: read failed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 96 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 97 | case CHAN_INPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 98 | debug("channel %d: input open -> drain", c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 99 | chan_shutdown_read(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 100 | c->istate = CHAN_INPUT_WAIT_DRAIN; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 101 | if (buffer_len(&c->input) == 0) { |
| 102 | debug("channel %d: input: no drain shortcut", c->self); |
| 103 | chan_ibuf_empty(c); |
| 104 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 105 | break; |
| 106 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 107 | error("channel %d: internal error: we do not read, but chan_read_failed for istate %d", |
| 108 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 109 | break; |
| 110 | } |
| 111 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 112 | static void |
| 113 | chan_ibuf_empty1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 114 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 115 | debug("channel %d: ibuf empty", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 116 | if (buffer_len(&c->input)) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 117 | error("channel %d: internal error: chan_ibuf_empty for non empty buffer", |
| 118 | c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 119 | return; |
| 120 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 121 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 122 | case CHAN_INPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 123 | debug("channel %d: input drain -> wait_oclose", c->self); |
| 124 | chan_send_ieof1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 125 | c->istate = CHAN_INPUT_WAIT_OCLOSE; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 126 | break; |
| 127 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 128 | error("channel %d: internal error: chan_ibuf_empty for istate %d", |
| 129 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 130 | break; |
| 131 | } |
| 132 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 133 | static void |
| 134 | chan_rcvd_ieof1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 135 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 136 | debug("channel %d: rcvd ieof", c->self); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 137 | if (c->type != SSH_CHANNEL_OPEN) { |
| 138 | debug("channel %d: non-open", c->self); |
| 139 | if (c->istate == CHAN_INPUT_OPEN) { |
| 140 | debug("channel %d: non-open: input open -> wait_oclose", c->self); |
| 141 | chan_shutdown_read(c); |
| 142 | chan_send_ieof1(c); |
| 143 | c->istate = CHAN_INPUT_WAIT_OCLOSE; |
| 144 | } else { |
| 145 | error("channel %d: istate %d != open", c->self, c->istate); |
| 146 | } |
| 147 | if (c->ostate == CHAN_OUTPUT_OPEN) { |
| 148 | debug("channel %d: non-open: output open -> closed", c->self); |
| 149 | chan_send_oclose1(c); |
| 150 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 151 | } else { |
| 152 | error("channel %d: ostate %d != open", c->self, c->ostate); |
| 153 | } |
| 154 | return; |
| 155 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 156 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 157 | case CHAN_OUTPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 158 | debug("channel %d: output open -> drain", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 159 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 160 | break; |
| 161 | case CHAN_OUTPUT_WAIT_IEOF: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 162 | debug("channel %d: output wait_ieof -> closed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 163 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 164 | break; |
| 165 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 166 | error("channel %d: protocol error: chan_rcvd_ieof for ostate %d", |
| 167 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 168 | break; |
| 169 | } |
| 170 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 171 | static void |
| 172 | chan_write_failed1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 173 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 174 | debug("channel %d: write failed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 175 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 176 | case CHAN_OUTPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 177 | debug("channel %d: output open -> wait_ieof", c->self); |
| 178 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 179 | c->ostate = CHAN_OUTPUT_WAIT_IEOF; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 180 | break; |
| 181 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 182 | debug("channel %d: output wait_drain -> closed", c->self); |
| 183 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 184 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 185 | break; |
| 186 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 187 | error("channel %d: internal error: chan_write_failed for ostate %d", |
| 188 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 189 | break; |
| 190 | } |
| 191 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 192 | static void |
| 193 | chan_obuf_empty1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 194 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 195 | debug("channel %d: obuf empty", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 196 | if (buffer_len(&c->output)) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 197 | error("channel %d: internal error: chan_obuf_empty for non empty buffer", |
| 198 | c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 199 | return; |
| 200 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 201 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 202 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 203 | debug("channel %d: output drain -> closed", c->self); |
| 204 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 205 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 206 | break; |
| 207 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 208 | error("channel %d: internal error: chan_obuf_empty for ostate %d", |
| 209 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 210 | break; |
| 211 | } |
| 212 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 213 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 214 | chan_send_ieof1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 215 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 216 | debug("channel %d: send ieof", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 217 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 218 | case CHAN_INPUT_OPEN: |
| 219 | case CHAN_INPUT_WAIT_DRAIN: |
| 220 | packet_start(SSH_MSG_CHANNEL_INPUT_EOF); |
| 221 | packet_put_int(c->remote_id); |
| 222 | packet_send(); |
| 223 | break; |
| 224 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 225 | error("channel %d: internal error: cannot send ieof for istate %d", |
| 226 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 227 | break; |
| 228 | } |
| 229 | } |
| 230 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 231 | chan_send_oclose1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 232 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 233 | debug("channel %d: send oclose", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 234 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 235 | case CHAN_OUTPUT_OPEN: |
| 236 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 237 | chan_shutdown_write(c); |
| 238 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 239 | packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); |
| 240 | packet_put_int(c->remote_id); |
| 241 | packet_send(); |
| 242 | break; |
| 243 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 244 | error("channel %d: internal error: cannot send oclose for ostate %d", |
| 245 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 246 | break; |
| 247 | } |
| 248 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 249 | |
| 250 | /* |
| 251 | * the same for SSH2 |
| 252 | */ |
| 253 | static void |
| 254 | chan_rcvd_oclose2(Channel *c) |
| 255 | { |
| 256 | debug("channel %d: rcvd close", c->self); |
| 257 | if (c->flags & CHAN_CLOSE_RCVD) |
| 258 | error("channel %d: protocol error: close rcvd twice", c->self); |
| 259 | c->flags |= CHAN_CLOSE_RCVD; |
| 260 | if (c->type == SSH_CHANNEL_LARVAL) { |
| 261 | /* tear down larval channels immediately */ |
| 262 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 263 | c->istate = CHAN_INPUT_CLOSED; |
| 264 | return; |
| 265 | } |
| 266 | switch (c->ostate) { |
| 267 | case CHAN_OUTPUT_OPEN: |
| 268 | /* wait until a data from the channel is consumed if a CLOSE is received */ |
| 269 | debug("channel %d: output open -> drain", c->self); |
| 270 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
| 271 | break; |
| 272 | } |
| 273 | switch (c->istate) { |
| 274 | case CHAN_INPUT_OPEN: |
| 275 | debug("channel %d: input open -> closed", c->self); |
| 276 | chan_shutdown_read(c); |
| 277 | break; |
| 278 | case CHAN_INPUT_WAIT_DRAIN: |
| 279 | debug("channel %d: input drain -> closed", c->self); |
| 280 | chan_send_eof2(c); |
| 281 | break; |
| 282 | } |
| 283 | c->istate = CHAN_INPUT_CLOSED; |
| 284 | } |
| 285 | static void |
| 286 | chan_ibuf_empty2(Channel *c) |
| 287 | { |
| 288 | debug("channel %d: ibuf empty", c->self); |
| 289 | if (buffer_len(&c->input)) { |
| 290 | error("channel %d: internal error: chan_ibuf_empty for non empty buffer", |
| 291 | c->self); |
| 292 | return; |
| 293 | } |
| 294 | switch (c->istate) { |
| 295 | case CHAN_INPUT_WAIT_DRAIN: |
| 296 | debug("channel %d: input drain -> closed", c->self); |
| 297 | if (!(c->flags & CHAN_CLOSE_SENT)) |
| 298 | chan_send_eof2(c); |
| 299 | c->istate = CHAN_INPUT_CLOSED; |
| 300 | break; |
| 301 | default: |
| 302 | error("channel %d: internal error: chan_ibuf_empty for istate %d", |
| 303 | c->self, c->istate); |
| 304 | break; |
| 305 | } |
| 306 | } |
| 307 | static void |
| 308 | chan_rcvd_ieof2(Channel *c) |
| 309 | { |
| 310 | debug("channel %d: rcvd eof", c->self); |
| 311 | if (c->ostate == CHAN_OUTPUT_OPEN) { |
| 312 | debug("channel %d: output open -> drain", c->self); |
| 313 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
| 314 | } |
| 315 | } |
| 316 | static void |
| 317 | chan_write_failed2(Channel *c) |
| 318 | { |
| 319 | debug("channel %d: write failed", c->self); |
| 320 | switch (c->ostate) { |
| 321 | case CHAN_OUTPUT_OPEN: |
| 322 | debug("channel %d: output open -> closed", c->self); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 323 | chan_shutdown_write(c); /* ?? */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 324 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 325 | break; |
| 326 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 327 | debug("channel %d: output drain -> closed", c->self); |
| 328 | chan_shutdown_write(c); |
| 329 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 330 | break; |
| 331 | default: |
| 332 | error("channel %d: internal error: chan_write_failed for ostate %d", |
| 333 | c->self, c->ostate); |
| 334 | break; |
| 335 | } |
| 336 | } |
| 337 | static void |
| 338 | chan_obuf_empty2(Channel *c) |
| 339 | { |
| 340 | debug("channel %d: obuf empty", c->self); |
| 341 | if (buffer_len(&c->output)) { |
| 342 | error("internal error: chan_obuf_empty %d for non empty buffer", |
| 343 | c->self); |
| 344 | return; |
| 345 | } |
| 346 | switch (c->ostate) { |
| 347 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 348 | debug("channel %d: output drain -> closed", c->self); |
| 349 | chan_shutdown_write(c); |
| 350 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 351 | break; |
| 352 | default: |
| 353 | error("channel %d: internal error: chan_obuf_empty for ostate %d", |
| 354 | c->self, c->ostate); |
| 355 | break; |
| 356 | } |
| 357 | } |
| 358 | static void |
| 359 | chan_send_eof2(Channel *c) |
| 360 | { |
| 361 | debug("channel %d: send eof", c->self); |
| 362 | switch (c->istate) { |
| 363 | case CHAN_INPUT_WAIT_DRAIN: |
| 364 | packet_start(SSH2_MSG_CHANNEL_EOF); |
| 365 | packet_put_int(c->remote_id); |
| 366 | packet_send(); |
| 367 | break; |
| 368 | default: |
| 369 | error("channel %d: internal error: cannot send eof for istate %d", |
| 370 | c->self, c->istate); |
| 371 | break; |
| 372 | } |
| 373 | } |
| 374 | static void |
| 375 | chan_send_close2(Channel *c) |
| 376 | { |
| 377 | debug("channel %d: send close", c->self); |
| 378 | if (c->ostate != CHAN_OUTPUT_CLOSED || |
| 379 | c->istate != CHAN_INPUT_CLOSED) { |
| 380 | error("channel %d: internal error: cannot send close for istate/ostate %d/%d", |
| 381 | c->self, c->istate, c->ostate); |
| 382 | } else if (c->flags & CHAN_CLOSE_SENT) { |
| 383 | error("channel %d: internal error: already sent close", c->self); |
| 384 | } else { |
| 385 | packet_start(SSH2_MSG_CHANNEL_CLOSE); |
| 386 | packet_put_int(c->remote_id); |
| 387 | packet_send(); |
| 388 | c->flags |= CHAN_CLOSE_SENT; |
| 389 | } |
| 390 | } |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 391 | |
| 392 | /* shared */ |
| 393 | |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 394 | void |
| 395 | chan_mark_dead(Channel *c) |
| 396 | { |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 397 | c->type = SSH_CHANNEL_ZOMBIE; |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 398 | } |
| 399 | |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 400 | int |
| 401 | chan_is_dead(Channel *c) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 402 | { |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 403 | if (c->type == SSH_CHANNEL_ZOMBIE) { |
| 404 | debug("channel %d: zombie", c->self); |
Ben Lindstrom | 99c73b3 | 2001-05-05 04:09:47 +0000 | [diff] [blame] | 405 | return 1; |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 406 | } |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 407 | if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) |
| 408 | return 0; |
| 409 | if (!compat20) { |
| 410 | debug("channel %d: is dead", c->self); |
| 411 | return 1; |
| 412 | } |
| 413 | /* |
| 414 | * we have to delay the close message if the efd (for stderr) is |
| 415 | * still active |
| 416 | */ |
| 417 | if (((c->extended_usage != CHAN_EXTENDED_IGNORE) && |
| 418 | buffer_len(&c->extended) > 0) |
| 419 | #if 0 |
| 420 | || ((c->extended_usage == CHAN_EXTENDED_READ) && |
| 421 | c->efd != -1) |
| 422 | #endif |
| 423 | ) { |
| 424 | debug2("channel %d: active efd: %d len %d type %s", |
| 425 | c->self, c->efd, buffer_len(&c->extended), |
| 426 | c->extended_usage==CHAN_EXTENDED_READ ? |
| 427 | "read": "write"); |
| 428 | } else { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 429 | if (!(c->flags & CHAN_CLOSE_SENT)) { |
| 430 | chan_send_close2(c); |
| 431 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 432 | if ((c->flags & CHAN_CLOSE_SENT) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 433 | (c->flags & CHAN_CLOSE_RCVD)) { |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 434 | debug("channel %d: is dead", c->self); |
| 435 | return 1; |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 436 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 437 | } |
Ben Lindstrom | 7fbd455 | 2001-03-05 06:16:11 +0000 | [diff] [blame] | 438 | return 0; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 439 | } |
| 440 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 441 | void |
| 442 | chan_init_iostates(Channel *c) |
| 443 | { |
| 444 | c->ostate = CHAN_OUTPUT_OPEN; |
| 445 | c->istate = CHAN_INPUT_OPEN; |
| 446 | c->flags = 0; |
| 447 | } |
| 448 | |
| 449 | /* init */ |
| 450 | void |
| 451 | chan_init(void) |
| 452 | { |
| 453 | if (compat20) { |
| 454 | chan_rcvd_oclose = chan_rcvd_oclose2; |
| 455 | chan_read_failed = chan_read_failed_12; |
| 456 | chan_ibuf_empty = chan_ibuf_empty2; |
| 457 | |
| 458 | chan_rcvd_ieof = chan_rcvd_ieof2; |
| 459 | chan_write_failed = chan_write_failed2; |
| 460 | chan_obuf_empty = chan_obuf_empty2; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 461 | } else { |
| 462 | chan_rcvd_oclose = chan_rcvd_oclose1; |
| 463 | chan_read_failed = chan_read_failed_12; |
| 464 | chan_ibuf_empty = chan_ibuf_empty1; |
| 465 | |
| 466 | chan_rcvd_ieof = chan_rcvd_ieof1; |
| 467 | chan_write_failed = chan_write_failed1; |
| 468 | chan_obuf_empty = chan_obuf_empty1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 469 | } |
| 470 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 471 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 472 | /* helper */ |
| 473 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 474 | chan_shutdown_write(Channel *c) |
| 475 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 476 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 477 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
| 478 | return; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 479 | /* shutdown failure is allowed if write failed already */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 480 | debug("channel %d: close_write", c->self); |
| 481 | if (c->sock != -1) { |
| 482 | if (shutdown(c->sock, SHUT_WR) < 0) |
| 483 | debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s", |
| 484 | c->self, c->sock, strerror(errno)); |
| 485 | } else { |
| 486 | if (close(c->wfd) < 0) |
| 487 | log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s", |
| 488 | c->self, c->wfd, strerror(errno)); |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 489 | c->wfd = -1; |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 490 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 491 | } |
| 492 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 493 | chan_shutdown_read(Channel *c) |
| 494 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 495 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
| 496 | return; |
| 497 | debug("channel %d: close_read", c->self); |
| 498 | if (c->sock != -1) { |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 499 | /* |
Damien Miller | 0f091bd | 2000-08-07 15:47:48 +1000 | [diff] [blame] | 500 | * shutdown(sock, SHUT_READ) may return ENOTCONN if the |
| 501 | * write side has been closed already. (bug on Linux) |
Kevin Steves | efe5fd8 | 2001-04-03 13:02:48 +0000 | [diff] [blame] | 502 | * HP-UX will return EINVAL. |
Damien Miller | 0f091bd | 2000-08-07 15:47:48 +1000 | [diff] [blame] | 503 | */ |
| 504 | if (shutdown(c->sock, SHUT_RD) < 0 |
Kevin Steves | efe5fd8 | 2001-04-03 13:02:48 +0000 | [diff] [blame] | 505 | && (errno != ENOTCONN && errno != EINVAL)) |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 506 | error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s", |
| 507 | c->self, c->sock, c->istate, c->ostate, strerror(errno)); |
| 508 | } else { |
| 509 | if (close(c->rfd) < 0) |
| 510 | log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s", |
| 511 | c->self, c->rfd, strerror(errno)); |
Ben Lindstrom | c0dee1a | 2001-06-05 20:52:50 +0000 | [diff] [blame] | 512 | c->rfd = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 513 | } |
| 514 | } |