2 * Copyright (c) 1999 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
40 static void chan_send_ieof(Channel *c);
41 static void chan_send_oclose(Channel *c);
42 static void chan_shutdown_write(Channel *c);
43 static void chan_shutdown_read(Channel *c);
46 * EVENTS update channel input/output states execute ACTIONS
49 /* events concerning the INPUT from socket for channel (istate) */
51 chan_rcvd_oclose(Channel *c)
54 case CHAN_INPUT_WAIT_OCLOSE:
55 debug("channel %d: INPUT_WAIT_OCLOSE -> INPUT_CLOSED [rcvd OCLOSE]", c->self);
56 c->istate = CHAN_INPUT_CLOSED;
59 debug("channel %d: INPUT_OPEN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
60 chan_shutdown_read(c);
62 c->istate = CHAN_INPUT_CLOSED;
64 case CHAN_INPUT_WAIT_DRAIN:
65 /* both local read_failed and remote write_failed */
66 log("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
67 debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
69 c->istate = CHAN_INPUT_CLOSED;
72 error("protocol error: chan_rcvd_oclose %d for istate %d", c->self, c->istate);
77 chan_read_failed(Channel *c)
81 debug("channel %d: INPUT_OPEN -> INPUT_WAIT_DRAIN [read failed]", c->self);
82 chan_shutdown_read(c);
83 c->istate = CHAN_INPUT_WAIT_DRAIN;
86 error("internal error: we do not read, but chan_read_failed %d for istate %d",
92 chan_ibuf_empty(Channel *c)
94 if (buffer_len(&c->input)) {
95 error("internal error: chan_ibuf_empty %d for non empty buffer", c->self);
99 case CHAN_INPUT_WAIT_DRAIN:
100 debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_WAIT_OCLOSE [inbuf empty, send IEOF]", c->self);
102 c->istate = CHAN_INPUT_WAIT_OCLOSE;
105 error("internal error: chan_ibuf_empty %d for istate %d", c->self, c->istate);
110 /* events concerning the OUTPUT from channel for socket (ostate) */
112 chan_rcvd_ieof(Channel *c)
115 case CHAN_OUTPUT_OPEN:
116 debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_DRAIN [rvcd IEOF]", c->self);
117 c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
119 case CHAN_OUTPUT_WAIT_IEOF:
120 debug("channel %d: OUTPUT_WAIT_IEOF -> OUTPUT_CLOSED [rvcd IEOF]", c->self);
121 c->ostate = CHAN_OUTPUT_CLOSED;
124 error("protocol error: chan_rcvd_ieof %d for ostate %d", c->self, c->ostate);
129 chan_write_failed(Channel *c)
132 case CHAN_OUTPUT_OPEN:
133 debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_IEOF [write failed]", c->self);
135 c->ostate = CHAN_OUTPUT_WAIT_IEOF;
137 case CHAN_OUTPUT_WAIT_DRAIN:
138 debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [write failed]", c->self);
140 c->ostate = CHAN_OUTPUT_CLOSED;
143 error("internal error: chan_write_failed %d for ostate %d", c->self, c->ostate);
148 chan_obuf_empty(Channel *c)
150 if (buffer_len(&c->output)) {
151 debug("internal error: chan_obuf_empty %d for non empty buffer", c->self);
155 case CHAN_OUTPUT_WAIT_DRAIN:
156 debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [obuf empty, send OCLOSE]", c->self);
158 c->ostate = CHAN_OUTPUT_CLOSED;
161 error("internal error: chan_obuf_empty %d for ostate %d", c->self, c->ostate);
167 * ACTIONS: should never update the channel states: c->istate or c->ostate
170 chan_send_ieof(Channel *c)
173 case CHAN_INPUT_OPEN:
174 case CHAN_INPUT_WAIT_DRAIN:
175 packet_start(SSH_MSG_CHANNEL_INPUT_EOF);
176 packet_put_int(c->remote_id);
180 error("internal error: channel %d: cannot send IEOF for istate %d", c->self, c->istate);
185 chan_send_oclose(Channel *c)
188 case CHAN_OUTPUT_OPEN:
189 case CHAN_OUTPUT_WAIT_DRAIN:
190 chan_shutdown_write(c);
191 buffer_consume(&c->output, buffer_len(&c->output));
192 packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
193 packet_put_int(c->remote_id);
197 error("internal error: channel %d: cannot send OCLOSE for ostate %d", c->self, c->istate);
204 chan_shutdown_write(Channel *c)
206 /* shutdown failure is allowed if write failed already */
207 debug("channel %d: shutdown_write", c->self);
208 if (shutdown(c->sock, SHUT_WR) < 0)
209 debug("chan_shutdown_write failed for #%d/fd%d: %.100s",
210 c->self, c->sock, strerror(errno));
213 chan_shutdown_read(Channel *c)
215 debug("channel %d: shutdown_read", c->self);
216 if (shutdown(c->sock, SHUT_RD) < 0)
217 error("chan_shutdown_read failed for #%d/fd%d [i%d o%d]: %.100s",
218 c->self, c->sock, c->istate, c->ostate, strerror(errno));
221 chan_delete_if_full_closed(Channel *c)
223 if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
224 debug("channel %d: full closed", c->self);
225 channel_free(c->self);
229 chan_init_iostates(Channel *c)
231 c->ostate = CHAN_OUTPUT_OPEN;
232 c->istate = CHAN_INPUT_OPEN;