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 | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 31 | RCSID("$Id: nchan.c,v 1.8 2000/04/16 01:18:43 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 | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 110 | break; |
| 111 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 112 | error("channel %d: internal error: we do not read, but chan_read_failed for istate %d", |
| 113 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 114 | break; |
| 115 | } |
| 116 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 117 | static void |
| 118 | chan_ibuf_empty1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 119 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 120 | debug("channel %d: ibuf empty", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 121 | if (buffer_len(&c->input)) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 122 | error("channel %d: internal error: chan_ibuf_empty for non empty buffer", |
| 123 | c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 124 | return; |
| 125 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 126 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 127 | case CHAN_INPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 128 | debug("channel %d: input drain -> wait_oclose", c->self); |
| 129 | chan_send_ieof1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 130 | c->istate = CHAN_INPUT_WAIT_OCLOSE; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 131 | break; |
| 132 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 133 | error("channel %d: internal error: chan_ibuf_empty for istate %d", |
| 134 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 135 | break; |
| 136 | } |
| 137 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 138 | static void |
| 139 | chan_rcvd_ieof1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 140 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 141 | debug("channel %d: rcvd ieof", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 142 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 143 | case CHAN_OUTPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 144 | debug("channel %d: output open -> drain", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 145 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 146 | break; |
| 147 | case CHAN_OUTPUT_WAIT_IEOF: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 148 | debug("channel %d: output wait_ieof -> closed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 149 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 150 | break; |
| 151 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 152 | error("channel %d: protocol error: chan_rcvd_ieof for ostate %d", |
| 153 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 154 | break; |
| 155 | } |
| 156 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 157 | static void |
| 158 | chan_write_failed1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 159 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 160 | debug("channel %d: write failed", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 161 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | case CHAN_OUTPUT_OPEN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 163 | debug("channel %d: output open -> wait_ieof", c->self); |
| 164 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 165 | c->ostate = CHAN_OUTPUT_WAIT_IEOF; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 166 | break; |
| 167 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 168 | debug("channel %d: output wait_drain -> closed", c->self); |
| 169 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 170 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 171 | break; |
| 172 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 173 | error("channel %d: internal error: chan_write_failed for ostate %d", |
| 174 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 175 | break; |
| 176 | } |
| 177 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 178 | static void |
| 179 | chan_obuf_empty1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 180 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 181 | debug("channel %d: obuf empty", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 182 | if (buffer_len(&c->output)) { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 183 | error("channel %d: internal error: chan_obuf_empty for non empty buffer", |
| 184 | c->self); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 185 | return; |
| 186 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 187 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 188 | case CHAN_OUTPUT_WAIT_DRAIN: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 189 | debug("channel %d: output drain -> closed", c->self); |
| 190 | chan_send_oclose1(c); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 191 | c->ostate = CHAN_OUTPUT_CLOSED; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 192 | break; |
| 193 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 194 | error("channel %d: internal error: chan_obuf_empty for ostate %d", |
| 195 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 196 | break; |
| 197 | } |
| 198 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 199 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 200 | chan_send_ieof1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 201 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 202 | debug("channel %d: send ieof", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 203 | switch (c->istate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 204 | case CHAN_INPUT_OPEN: |
| 205 | case CHAN_INPUT_WAIT_DRAIN: |
| 206 | packet_start(SSH_MSG_CHANNEL_INPUT_EOF); |
| 207 | packet_put_int(c->remote_id); |
| 208 | packet_send(); |
| 209 | break; |
| 210 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 211 | error("channel %d: internal error: cannot send ieof for istate %d", |
| 212 | c->self, c->istate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 213 | break; |
| 214 | } |
| 215 | } |
| 216 | static void |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 217 | chan_send_oclose1(Channel *c) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 218 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 219 | debug("channel %d: send oclose", c->self); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 220 | switch (c->ostate) { |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 221 | case CHAN_OUTPUT_OPEN: |
| 222 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 223 | chan_shutdown_write(c); |
| 224 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 225 | packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); |
| 226 | packet_put_int(c->remote_id); |
| 227 | packet_send(); |
| 228 | break; |
| 229 | default: |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 230 | error("channel %d: internal error: cannot send oclose for ostate %d", |
| 231 | c->self, c->ostate); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 232 | break; |
| 233 | } |
| 234 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 235 | static void |
| 236 | chan_delete_if_full_closed1(Channel *c) |
| 237 | { |
| 238 | if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { |
| 239 | debug("channel %d: full closed", c->self); |
| 240 | channel_free(c->self); |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * the same for SSH2 |
| 246 | */ |
| 247 | static void |
| 248 | chan_rcvd_oclose2(Channel *c) |
| 249 | { |
| 250 | debug("channel %d: rcvd close", c->self); |
| 251 | if (c->flags & CHAN_CLOSE_RCVD) |
| 252 | error("channel %d: protocol error: close rcvd twice", c->self); |
| 253 | c->flags |= CHAN_CLOSE_RCVD; |
| 254 | if (c->type == SSH_CHANNEL_LARVAL) { |
| 255 | /* tear down larval channels immediately */ |
| 256 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 257 | c->istate = CHAN_INPUT_CLOSED; |
| 258 | return; |
| 259 | } |
| 260 | switch (c->ostate) { |
| 261 | case CHAN_OUTPUT_OPEN: |
| 262 | /* wait until a data from the channel is consumed if a CLOSE is received */ |
| 263 | debug("channel %d: output open -> drain", c->self); |
| 264 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
| 265 | break; |
| 266 | } |
| 267 | switch (c->istate) { |
| 268 | case CHAN_INPUT_OPEN: |
| 269 | debug("channel %d: input open -> closed", c->self); |
| 270 | chan_shutdown_read(c); |
| 271 | break; |
| 272 | case CHAN_INPUT_WAIT_DRAIN: |
| 273 | debug("channel %d: input drain -> closed", c->self); |
| 274 | chan_send_eof2(c); |
| 275 | break; |
| 276 | } |
| 277 | c->istate = CHAN_INPUT_CLOSED; |
| 278 | } |
| 279 | static void |
| 280 | chan_ibuf_empty2(Channel *c) |
| 281 | { |
| 282 | debug("channel %d: ibuf empty", c->self); |
| 283 | if (buffer_len(&c->input)) { |
| 284 | error("channel %d: internal error: chan_ibuf_empty for non empty buffer", |
| 285 | c->self); |
| 286 | return; |
| 287 | } |
| 288 | switch (c->istate) { |
| 289 | case CHAN_INPUT_WAIT_DRAIN: |
| 290 | debug("channel %d: input drain -> closed", c->self); |
| 291 | if (!(c->flags & CHAN_CLOSE_SENT)) |
| 292 | chan_send_eof2(c); |
| 293 | c->istate = CHAN_INPUT_CLOSED; |
| 294 | break; |
| 295 | default: |
| 296 | error("channel %d: internal error: chan_ibuf_empty for istate %d", |
| 297 | c->self, c->istate); |
| 298 | break; |
| 299 | } |
| 300 | } |
| 301 | static void |
| 302 | chan_rcvd_ieof2(Channel *c) |
| 303 | { |
| 304 | debug("channel %d: rcvd eof", c->self); |
| 305 | if (c->ostate == CHAN_OUTPUT_OPEN) { |
| 306 | debug("channel %d: output open -> drain", c->self); |
| 307 | c->ostate = CHAN_OUTPUT_WAIT_DRAIN; |
| 308 | } |
| 309 | } |
| 310 | static void |
| 311 | chan_write_failed2(Channel *c) |
| 312 | { |
| 313 | debug("channel %d: write failed", c->self); |
| 314 | switch (c->ostate) { |
| 315 | case CHAN_OUTPUT_OPEN: |
| 316 | debug("channel %d: output open -> closed", c->self); |
| 317 | chan_shutdown_write(c); // ?? |
| 318 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 319 | break; |
| 320 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 321 | debug("channel %d: output drain -> closed", c->self); |
| 322 | chan_shutdown_write(c); |
| 323 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 324 | break; |
| 325 | default: |
| 326 | error("channel %d: internal error: chan_write_failed for ostate %d", |
| 327 | c->self, c->ostate); |
| 328 | break; |
| 329 | } |
| 330 | } |
| 331 | static void |
| 332 | chan_obuf_empty2(Channel *c) |
| 333 | { |
| 334 | debug("channel %d: obuf empty", c->self); |
| 335 | if (buffer_len(&c->output)) { |
| 336 | error("internal error: chan_obuf_empty %d for non empty buffer", |
| 337 | c->self); |
| 338 | return; |
| 339 | } |
| 340 | switch (c->ostate) { |
| 341 | case CHAN_OUTPUT_WAIT_DRAIN: |
| 342 | debug("channel %d: output drain -> closed", c->self); |
| 343 | chan_shutdown_write(c); |
| 344 | c->ostate = CHAN_OUTPUT_CLOSED; |
| 345 | break; |
| 346 | default: |
| 347 | error("channel %d: internal error: chan_obuf_empty for ostate %d", |
| 348 | c->self, c->ostate); |
| 349 | break; |
| 350 | } |
| 351 | } |
| 352 | static void |
| 353 | chan_send_eof2(Channel *c) |
| 354 | { |
| 355 | debug("channel %d: send eof", c->self); |
| 356 | switch (c->istate) { |
| 357 | case CHAN_INPUT_WAIT_DRAIN: |
| 358 | packet_start(SSH2_MSG_CHANNEL_EOF); |
| 359 | packet_put_int(c->remote_id); |
| 360 | packet_send(); |
| 361 | break; |
| 362 | default: |
| 363 | error("channel %d: internal error: cannot send eof for istate %d", |
| 364 | c->self, c->istate); |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | static void |
| 369 | chan_send_close2(Channel *c) |
| 370 | { |
| 371 | debug("channel %d: send close", c->self); |
| 372 | if (c->ostate != CHAN_OUTPUT_CLOSED || |
| 373 | c->istate != CHAN_INPUT_CLOSED) { |
| 374 | error("channel %d: internal error: cannot send close for istate/ostate %d/%d", |
| 375 | c->self, c->istate, c->ostate); |
| 376 | } else if (c->flags & CHAN_CLOSE_SENT) { |
| 377 | error("channel %d: internal error: already sent close", c->self); |
| 378 | } else { |
| 379 | packet_start(SSH2_MSG_CHANNEL_CLOSE); |
| 380 | packet_put_int(c->remote_id); |
| 381 | packet_send(); |
| 382 | c->flags |= CHAN_CLOSE_SENT; |
| 383 | } |
| 384 | } |
| 385 | static void |
| 386 | chan_delete_if_full_closed2(Channel *c) |
| 387 | { |
| 388 | if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) { |
| 389 | if (!(c->flags & CHAN_CLOSE_SENT)) { |
| 390 | chan_send_close2(c); |
| 391 | } |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 392 | if ((c->flags & CHAN_CLOSE_SENT) && |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 393 | (c->flags & CHAN_CLOSE_RCVD)) { |
| 394 | debug("channel %d: full closed2", c->self); |
| 395 | channel_free(c->self); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 396 | } |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 397 | } |
| 398 | } |
| 399 | |
| 400 | /* shared */ |
| 401 | void |
| 402 | chan_init_iostates(Channel *c) |
| 403 | { |
| 404 | c->ostate = CHAN_OUTPUT_OPEN; |
| 405 | c->istate = CHAN_INPUT_OPEN; |
| 406 | c->flags = 0; |
| 407 | } |
| 408 | |
| 409 | /* init */ |
| 410 | void |
| 411 | chan_init(void) |
| 412 | { |
| 413 | if (compat20) { |
| 414 | chan_rcvd_oclose = chan_rcvd_oclose2; |
| 415 | chan_read_failed = chan_read_failed_12; |
| 416 | chan_ibuf_empty = chan_ibuf_empty2; |
| 417 | |
| 418 | chan_rcvd_ieof = chan_rcvd_ieof2; |
| 419 | chan_write_failed = chan_write_failed2; |
| 420 | chan_obuf_empty = chan_obuf_empty2; |
| 421 | |
| 422 | chan_delete_if_full_closed = chan_delete_if_full_closed2; |
| 423 | } else { |
| 424 | chan_rcvd_oclose = chan_rcvd_oclose1; |
| 425 | chan_read_failed = chan_read_failed_12; |
| 426 | chan_ibuf_empty = chan_ibuf_empty1; |
| 427 | |
| 428 | chan_rcvd_ieof = chan_rcvd_ieof1; |
| 429 | chan_write_failed = chan_write_failed1; |
| 430 | chan_obuf_empty = chan_obuf_empty1; |
| 431 | |
| 432 | chan_delete_if_full_closed = chan_delete_if_full_closed1; |
| 433 | } |
| 434 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 435 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 436 | /* helper */ |
| 437 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 438 | chan_shutdown_write(Channel *c) |
| 439 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 440 | buffer_consume(&c->output, buffer_len(&c->output)); |
| 441 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
| 442 | return; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 443 | /* shutdown failure is allowed if write failed already */ |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 444 | debug("channel %d: close_write", c->self); |
| 445 | if (c->sock != -1) { |
| 446 | if (shutdown(c->sock, SHUT_WR) < 0) |
| 447 | debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s", |
| 448 | c->self, c->sock, strerror(errno)); |
| 449 | } else { |
| 450 | if (close(c->wfd) < 0) |
| 451 | log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s", |
| 452 | c->self, c->wfd, strerror(errno)); |
| 453 | c->wfd = -1; |
| 454 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 455 | } |
| 456 | static void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 457 | chan_shutdown_read(Channel *c) |
| 458 | { |
Damien Miller | 33b1356 | 2000-04-04 14:38:59 +1000 | [diff] [blame] | 459 | if (compat20 && c->type == SSH_CHANNEL_LARVAL) |
| 460 | return; |
| 461 | debug("channel %d: close_read", c->self); |
| 462 | if (c->sock != -1) { |
| 463 | if (shutdown(c->sock, SHUT_RD) < 0) |
| 464 | error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s", |
| 465 | c->self, c->sock, c->istate, c->ostate, strerror(errno)); |
| 466 | } else { |
| 467 | if (close(c->rfd) < 0) |
| 468 | log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s", |
| 469 | c->self, c->rfd, strerror(errno)); |
| 470 | c->rfd = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 471 | } |
| 472 | } |