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. |
| 12 | * 3. All advertising materials mentioning features or use of this software |
| 13 | * must display the following acknowledgement: |
| 14 | * This product includes software developed by Markus Friedl. |
| 15 | * 4. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 30 | #include "includes.h" |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 31 | RCSID("$Id: nchan.c,v 1.10 2000/05/09 01:03:01 damien Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 32 | |
| 33 | #include "ssh.h" |
| 34 | |
| 35 | #include "buffer.h" |
| 36 | #include "packet.h" |
| 37 | #include "channels.h" |
| 38 | #include "nchan.h" |
| 39 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 40 | #include "ssh2.h" |
| 41 | #include "compat.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 43 | /* functions manipulating channel states */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 45 | * EVENTS update channel input/output states execute ACTIONS |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 46 | */ |
| 47 | /* events concerning the INPUT from socket for channel (istate) */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 48 | chan_event_fn *chan_rcvd_oclose = NULL; |
| 49 | chan_event_fn *chan_read_failed = NULL; |
| 50 | chan_event_fn *chan_ibuf_empty = NULL; |
| 51 | /* events concerning the OUTPUT from channel for socket (ostate) */ |
| 52 | chan_event_fn *chan_rcvd_ieof = NULL; |
| 53 | chan_event_fn *chan_write_failed = NULL; |
| 54 | chan_event_fn *chan_obuf_empty = NULL; |
| 55 | /* |
| 56 | * ACTIONS: should never update the channel states |
| 57 | */ |
| 58 | static void chan_send_ieof1(Channel *c); |
| 59 | static void chan_send_oclose1(Channel *c); |
| 60 | static void chan_send_close2(Channel *c); |
| 61 | static void chan_send_eof2(Channel *c); |
| 62 | |
| 63 | /* channel cleanup */ |
| 64 | chan_event_fn *chan_delete_if_full_closed = NULL; |
| 65 | |
| 66 | /* helper */ |
| 67 | static void chan_shutdown_write(Channel *c); |
| 68 | static void chan_shutdown_read(Channel *c); |
| 69 | |
| 70 | /* |
| 71 | * SSH1 specific implementation of event functions |
| 72 | */ |
| 73 | |
| 74 | static void |
| 75 | chan_rcvd_oclose1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 76 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 77 | debug("channel %d: rcvd oclose", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 78 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | case CHAN_INPUT_WAIT_OCLOSE: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 80 | debug("channel %d: input wait_oclose -> closed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 81 | c->istate = CHAN_INPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | break; |
| 83 | case CHAN_INPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 84 | debug("channel %d: input open -> closed", c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | chan_shutdown_read(c); |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 86 | chan_send_ieof1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 87 | c->istate = CHAN_INPUT_CLOSED; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 88 | break; |
| 89 | case CHAN_INPUT_WAIT_DRAIN: |
| 90 | /* both local read_failed and remote write_failed */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 91 | log("channel %d: input drain -> closed", c->self); |
| 92 | chan_send_ieof1(c); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 93 | c->istate = CHAN_INPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 94 | break; |
| 95 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 96 | error("channel %d: protocol error: chan_rcvd_oclose for istate %d", |
| 97 | c->self, c->istate); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 98 | return; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 99 | } |
| 100 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 101 | static void |
| 102 | chan_read_failed_12(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 103 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 104 | debug("channel %d: read failed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 105 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 106 | case CHAN_INPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 107 | debug("channel %d: input open -> drain", c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 108 | chan_shutdown_read(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 109 | c->istate = CHAN_INPUT_WAIT_DRAIN; |
Damien Miller | 30c3d42 | 2000-05-09 11:02:59 +1000 | [diff] [blame] | 110 | if (buffer_len(&c->input) == 0) { |
| 111 | debug("channel %d: input: no drain shortcut", c->self); |
| 112 | chan_ibuf_empty(c); |
| 113 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 114 | break; |
| 115 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 116 | error("channel %d: internal error: we do not read, but chan_read_failed for istate %d", |
| 117 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 118 | break; |
| 119 | } |
| 120 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 121 | static void |
| 122 | chan_ibuf_empty1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 123 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 124 | debug("channel %d: ibuf empty", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 125 | if (buffer_len(&c->input)) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 126 | error("channel %d: internal error: chan_ibuf_empty for non empty buffer", |
| 127 | c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 128 | return; |
| 129 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 130 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 131 | case CHAN_INPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 132 | debug("channel %d: input drain -> wait_oclose", c->self); |
| 133 | chan_send_ieof1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 134 | c->istate = CHAN_INPUT_WAIT_OCLOSE; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 135 | break; |
| 136 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 137 | error("channel %d: internal error: chan_ibuf_empty for istate %d", |
| 138 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 139 | break; |
| 140 | } |
| 141 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 142 | static void |
| 143 | chan_rcvd_ieof1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 144 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 145 | debug("channel %d: rcvd ieof", c->self); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 146 | if (c->type != SSH_CHANNEL_OPEN) { |
| 147 | debug("channel %d: non-open", c->self); |
| 148 | if (c->istate == CHAN_INPUT_OPEN) { |
| 149 | debug("channel %d: non-open: input open -> wait_oclose", c->self); |
| 150 | chan_shutdown_read(c); |
| 151 | chan_send_ieof1(c); |
| 152 | c->istate = CHAN_INPUT_WAIT_OCLOSE; |
| 153 | } else { |
| 154 | error("channel %d: istate %d != open", c->self, c->istate); |
| 155 | } |
| 156 | if (c->ostate == CHAN_OUTPUT_OPEN) { |
| 157 | debug("channel %d: non-open: output open -> closed", c->self); |
| 158 | chan_send_oclose1(c); |
| 159 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 160 | } else { |
| 161 | error("channel %d: ostate %d != open", c->self, c->ostate); |
| 162 | } |
| 163 | return; |
| 164 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 165 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 166 | case CHAN_OUTPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 167 | debug("channel %d: output open -> drain", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 168 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 169 | break; |
| 170 | case CHAN_OUTPUT_WAIT_IEOF: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 171 | debug("channel %d: output wait_ieof -> closed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 172 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 173 | break; |
| 174 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 175 | error("channel %d: protocol error: chan_rcvd_ieof for ostate %d", |
| 176 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 177 | break; |
| 178 | } |
| 179 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 180 | static void |
| 181 | chan_write_failed1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 182 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 183 | debug("channel %d: write failed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 184 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 185 | case CHAN_OUTPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 186 | debug("channel %d: output open -> wait_ieof", c->self); |
| 187 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 188 | c->ostate = CHAN_OUTPUT_WAIT_IEOF; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 189 | break; |
| 190 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 191 | debug("channel %d: output wait_drain -> closed", c->self); |
| 192 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 193 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 194 | break; |
| 195 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 196 | error("channel %d: internal error: chan_write_failed for ostate %d", |
| 197 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 198 | break; |
| 199 | } |
| 200 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 201 | static void |
| 202 | chan_obuf_empty1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 203 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 204 | debug("channel %d: obuf empty", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 205 | if (buffer_len(&c->output)) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 206 | error("channel %d: internal error: chan_obuf_empty for non empty buffer", |
| 207 | c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 208 | return; |
| 209 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 210 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 211 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 212 | debug("channel %d: output drain -> closed", c->self); |
| 213 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 214 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | break; |
| 216 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 217 | error("channel %d: internal error: chan_obuf_empty for ostate %d", |
| 218 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 219 | break; |
| 220 | } |
| 221 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 222 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 223 | chan_send_ieof1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 224 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 225 | debug("channel %d: send ieof", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 226 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 227 | case CHAN_INPUT_OPEN: |
| 228 | case CHAN_INPUT_WAIT_DRAIN: |
| 229 | packet_start(SSH_MSG_CHANNEL_INPUT_EOF); |
| 230 | packet_put_int(c->remote_id); |
| 231 | packet_send(); |
| 232 | break; |
| 233 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 234 | error("channel %d: internal error: cannot send ieof for istate %d", |
| 235 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 236 | break; |
| 237 | } |
| 238 | } |
| 239 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 240 | chan_send_oclose1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 241 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 242 | debug("channel %d: send oclose", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 243 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 244 | case CHAN_OUTPUT_OPEN: |
| 245 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 246 | chan_shutdown_write(c); |
| 247 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 248 | packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); |
| 249 | packet_put_int(c->remote_id); |
| 250 | packet_send(); |
| 251 | break; |
| 252 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 253 | error("channel %d: internal error: cannot send oclose for ostate %d", |
| 254 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 255 | break; |
| 256 | } |
| 257 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 258 | static void |
| 259 | chan_delete_if_full_closed1(Channel *c) |
| 260 | { |
| 261 | if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { |
| 262 | debug("channel %d: full closed", c->self); |
| 263 | channel_free(c->self); |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * the same for SSH2 |
| 269 | */ |
| 270 | static void |
| 271 | chan_rcvd_oclose2(Channel *c) |
| 272 | { |
| 273 | debug("channel %d: rcvd close", c->self); |
| 274 | if (c->flags & CHAN_CLOSE_RCVD) |
| 275 | error("channel %d: protocol error: close rcvd twice", c->self); |
| 276 | c->flags |= CHAN_CLOSE_RCVD; |
| 277 | if (c->type == SSH_CHANNEL_LARVAL) { |
| 278 | /* tear down larval channels immediately */ |
| 279 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 280 | c->istate = CHAN_INPUT_CLOSED; |
| 281 | return; |
| 282 | } |
| 283 | switch (c->ostate) { |
| 284 | case CHAN_OUTPUT_OPEN: |
| 285 | /* wait until a data from the channel is consumed if a CLOSE is received */ |
| 286 | debug("channel %d: output open -> drain", c->self); |
| 287 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
| 288 | break; |
| 289 | } |
| 290 | switch (c->istate) { |
| 291 | case CHAN_INPUT_OPEN: |
| 292 | debug("channel %d: input open -> closed", c->self); |
| 293 | chan_shutdown_read(c); |
| 294 | break; |
| 295 | case CHAN_INPUT_WAIT_DRAIN: |
| 296 | debug("channel %d: input drain -> closed", c->self); |
| 297 | chan_send_eof2(c); |
| 298 | break; |
| 299 | } |
| 300 | c->istate = CHAN_INPUT_CLOSED; |
| 301 | } |
| 302 | static void |
| 303 | chan_ibuf_empty2(Channel *c) |
| 304 | { |
| 305 | debug("channel %d: ibuf empty", c->self); |
| 306 | if (buffer_len(&c->input)) { |
| 307 | error("channel %d: internal error: chan_ibuf_empty for non empty buffer", |
| 308 | c->self); |
| 309 | return; |
| 310 | } |
| 311 | switch (c->istate) { |
| 312 | case CHAN_INPUT_WAIT_DRAIN: |
| 313 | debug("channel %d: input drain -> closed", c->self); |
| 314 | if (!(c->flags & CHAN_CLOSE_SENT)) |
| 315 | chan_send_eof2(c); |
| 316 | c->istate = CHAN_INPUT_CLOSED; |
| 317 | break; |
| 318 | default: |
| 319 | error("channel %d: internal error: chan_ibuf_empty for istate %d", |
| 320 | c->self, c->istate); |
| 321 | break; |
| 322 | } |
| 323 | } |
| 324 | static void |
| 325 | chan_rcvd_ieof2(Channel *c) |
| 326 | { |
| 327 | debug("channel %d: rcvd eof", c->self); |
| 328 | if (c->ostate == CHAN_OUTPUT_OPEN) { |
| 329 | debug("channel %d: output open -> drain", c->self); |
| 330 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
| 331 | } |
| 332 | } |
| 333 | static void |
| 334 | chan_write_failed2(Channel *c) |
| 335 | { |
| 336 | debug("channel %d: write failed", c->self); |
| 337 | switch (c->ostate) { |
| 338 | case CHAN_OUTPUT_OPEN: |
| 339 | debug("channel %d: output open -> closed", c->self); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 340 | chan_shutdown_write(c); /* ?? */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 341 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 342 | break; |
| 343 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 344 | debug("channel %d: output drain -> closed", c->self); |
| 345 | chan_shutdown_write(c); |
| 346 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 347 | break; |
| 348 | default: |
| 349 | error("channel %d: internal error: chan_write_failed for ostate %d", |
| 350 | c->self, c->ostate); |
| 351 | break; |
| 352 | } |
| 353 | } |
| 354 | static void |
| 355 | chan_obuf_empty2(Channel *c) |
| 356 | { |
| 357 | debug("channel %d: obuf empty", c->self); |
| 358 | if (buffer_len(&c->output)) { |
| 359 | error("internal error: chan_obuf_empty %d for non empty buffer", |
| 360 | c->self); |
| 361 | return; |
| 362 | } |
| 363 | switch (c->ostate) { |
| 364 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 365 | debug("channel %d: output drain -> closed", c->self); |
| 366 | chan_shutdown_write(c); |
| 367 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 368 | break; |
| 369 | default: |
| 370 | error("channel %d: internal error: chan_obuf_empty for ostate %d", |
| 371 | c->self, c->ostate); |
| 372 | break; |
| 373 | } |
| 374 | } |
| 375 | static void |
| 376 | chan_send_eof2(Channel *c) |
| 377 | { |
| 378 | debug("channel %d: send eof", c->self); |
| 379 | switch (c->istate) { |
| 380 | case CHAN_INPUT_WAIT_DRAIN: |
| 381 | packet_start(SSH2_MSG_CHANNEL_EOF); |
| 382 | packet_put_int(c->remote_id); |
| 383 | packet_send(); |
| 384 | break; |
| 385 | default: |
| 386 | error("channel %d: internal error: cannot send eof for istate %d", |
| 387 | c->self, c->istate); |
| 388 | break; |
| 389 | } |
| 390 | } |
| 391 | static void |
| 392 | chan_send_close2(Channel *c) |
| 393 | { |
| 394 | debug("channel %d: send close", c->self); |
| 395 | if (c->ostate != CHAN_OUTPUT_CLOSED || |
| 396 | c->istate != CHAN_INPUT_CLOSED) { |
| 397 | error("channel %d: internal error: cannot send close for istate/ostate %d/%d", |
| 398 | c->self, c->istate, c->ostate); |
| 399 | } else if (c->flags & CHAN_CLOSE_SENT) { |
| 400 | error("channel %d: internal error: already sent close", c->self); |
| 401 | } else { |
| 402 | packet_start(SSH2_MSG_CHANNEL_CLOSE); |
| 403 | packet_put_int(c->remote_id); |
| 404 | packet_send(); |
| 405 | c->flags |= CHAN_CLOSE_SENT; |
| 406 | } |
| 407 | } |
| 408 | static void |
| 409 | chan_delete_if_full_closed2(Channel *c) |
| 410 | { |
| 411 | if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { |
| 412 | if (!(c->flags & CHAN_CLOSE_SENT)) { |
| 413 | chan_send_close2(c); |
| 414 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 415 | if ((c->flags & CHAN_CLOSE_SENT) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 416 | (c->flags & CHAN_CLOSE_RCVD)) { |
| 417 | debug("channel %d: full closed2", c->self); |
| 418 | channel_free(c->self); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 419 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 420 | } |
| 421 | } |
| 422 | |
| 423 | /* shared */ |
| 424 | void |
| 425 | chan_init_iostates(Channel *c) |
| 426 | { |
| 427 | c->ostate = CHAN_OUTPUT_OPEN; |
| 428 | c->istate = CHAN_INPUT_OPEN; |
| 429 | c->flags = 0; |
| 430 | } |
| 431 | |
| 432 | /* init */ |
| 433 | void |
| 434 | chan_init(void) |
| 435 | { |
| 436 | if (compat20) { |
| 437 | chan_rcvd_oclose = chan_rcvd_oclose2; |
| 438 | chan_read_failed = chan_read_failed_12; |
| 439 | chan_ibuf_empty = chan_ibuf_empty2; |
| 440 | |
| 441 | chan_rcvd_ieof = chan_rcvd_ieof2; |
| 442 | chan_write_failed = chan_write_failed2; |
| 443 | chan_obuf_empty = chan_obuf_empty2; |
| 444 | |
| 445 | chan_delete_if_full_closed = chan_delete_if_full_closed2; |
| 446 | } else { |
| 447 | chan_rcvd_oclose = chan_rcvd_oclose1; |
| 448 | chan_read_failed = chan_read_failed_12; |
| 449 | chan_ibuf_empty = chan_ibuf_empty1; |
| 450 | |
| 451 | chan_rcvd_ieof = chan_rcvd_ieof1; |
| 452 | chan_write_failed = chan_write_failed1; |
| 453 | chan_obuf_empty = chan_obuf_empty1; |
| 454 | |
| 455 | chan_delete_if_full_closed = chan_delete_if_full_closed1; |
| 456 | } |
| 457 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 458 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 459 | /* helper */ |
| 460 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 461 | chan_shutdown_write(Channel *c) |
| 462 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 463 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 464 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
| 465 | return; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 466 | /* shutdown failure is allowed if write failed already */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 467 | debug("channel %d: close_write", c->self); |
| 468 | if (c->sock != -1) { |
| 469 | if (shutdown(c->sock, SHUT_WR) < 0) |
| 470 | debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s", |
| 471 | c->self, c->sock, strerror(errno)); |
| 472 | } else { |
| 473 | if (close(c->wfd) < 0) |
| 474 | log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s", |
| 475 | c->self, c->wfd, strerror(errno)); |
| 476 | c->wfd = -1; |
| 477 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 478 | } |
| 479 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 480 | chan_shutdown_read(Channel *c) |
| 481 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 482 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
| 483 | return; |
| 484 | debug("channel %d: close_read", c->self); |
| 485 | if (c->sock != -1) { |
| 486 | if (shutdown(c->sock, SHUT_RD) < 0) |
| 487 | error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s", |
| 488 | c->self, c->sock, c->istate, c->ostate, strerror(errno)); |
| 489 | } else { |
| 490 | if (close(c->rfd) < 0) |
| 491 | log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s", |
| 492 | c->self, c->rfd, strerror(errno)); |
| 493 | c->rfd = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 494 | } |
| 495 | } |