summaryrefslogtreecommitdiff
path: root/crypto/openssh/nchan.c
diff options
context:
space:
mode:
Diffstat (limited to 'crypto/openssh/nchan.c')
-rw-r--r--crypto/openssh/nchan.c490
1 files changed, 0 insertions, 490 deletions
diff --git a/crypto/openssh/nchan.c b/crypto/openssh/nchan.c
deleted file mode 100644
index 30c90b3b2b9a..000000000000
--- a/crypto/openssh/nchan.c
+++ /dev/null
@@ -1,490 +0,0 @@
-/*
- * Copyright (c) 1999 Markus Friedl. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "includes.h"
-RCSID("$OpenBSD: nchan.c,v 1.19 2000/09/07 20:27:52 deraadt Exp $");
-
-#include "ssh.h"
-
-#include "buffer.h"
-#include "packet.h"
-#include "channels.h"
-#include "nchan.h"
-
-#include "ssh2.h"
-#include "compat.h"
-
-/* functions manipulating channel states */
-/*
- * EVENTS update channel input/output states execute ACTIONS
- */
-/* events concerning the INPUT from socket for channel (istate) */
-chan_event_fn *chan_rcvd_oclose = NULL;
-chan_event_fn *chan_read_failed = NULL;
-chan_event_fn *chan_ibuf_empty = NULL;
-/* events concerning the OUTPUT from channel for socket (ostate) */
-chan_event_fn *chan_rcvd_ieof = NULL;
-chan_event_fn *chan_write_failed = NULL;
-chan_event_fn *chan_obuf_empty = NULL;
-/*
- * ACTIONS: should never update the channel states
- */
-static void chan_send_ieof1(Channel *c);
-static void chan_send_oclose1(Channel *c);
-static void chan_send_close2(Channel *c);
-static void chan_send_eof2(Channel *c);
-
-/* channel cleanup */
-chan_event_fn *chan_delete_if_full_closed = NULL;
-
-/* helper */
-static void chan_shutdown_write(Channel *c);
-static void chan_shutdown_read(Channel *c);
-
-/*
- * SSH1 specific implementation of event functions
- */
-
-static void
-chan_rcvd_oclose1(Channel *c)
-{
- debug("channel %d: rcvd oclose", c->self);
- switch (c->istate) {
- case CHAN_INPUT_WAIT_OCLOSE:
- debug("channel %d: input wait_oclose -> closed", c->self);
- c->istate = CHAN_INPUT_CLOSED;
- break;
- case CHAN_INPUT_OPEN:
- debug("channel %d: input open -> closed", c->self);
- chan_shutdown_read(c);
- chan_send_ieof1(c);
- c->istate = CHAN_INPUT_CLOSED;
- break;
- case CHAN_INPUT_WAIT_DRAIN:
- /* both local read_failed and remote write_failed */
- log("channel %d: input drain -> closed", c->self);
- chan_send_ieof1(c);
- c->istate = CHAN_INPUT_CLOSED;
- break;
- default:
- error("channel %d: protocol error: chan_rcvd_oclose for istate %d",
- c->self, c->istate);
- return;
- }
-}
-static void
-chan_read_failed_12(Channel *c)
-{
- debug("channel %d: read failed", c->self);
- switch (c->istate) {
- case CHAN_INPUT_OPEN:
- debug("channel %d: input open -> drain", c->self);
- chan_shutdown_read(c);
- c->istate = CHAN_INPUT_WAIT_DRAIN;
- if (buffer_len(&c->input) == 0) {
- debug("channel %d: input: no drain shortcut", c->self);
- chan_ibuf_empty(c);
- }
- break;
- default:
- error("channel %d: internal error: we do not read, but chan_read_failed for istate %d",
- c->self, c->istate);
- break;
- }
-}
-static void
-chan_ibuf_empty1(Channel *c)
-{
- debug("channel %d: ibuf empty", c->self);
- if (buffer_len(&c->input)) {
- error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
- c->self);
- return;
- }
- switch (c->istate) {
- case CHAN_INPUT_WAIT_DRAIN:
- debug("channel %d: input drain -> wait_oclose", c->self);
- chan_send_ieof1(c);
- c->istate = CHAN_INPUT_WAIT_OCLOSE;
- break;
- default:
- error("channel %d: internal error: chan_ibuf_empty for istate %d",
- c->self, c->istate);
- break;
- }
-}
-static void
-chan_rcvd_ieof1(Channel *c)
-{
- debug("channel %d: rcvd ieof", c->self);
- if (c->type != SSH_CHANNEL_OPEN) {
- debug("channel %d: non-open", c->self);
- if (c->istate == CHAN_INPUT_OPEN) {
- debug("channel %d: non-open: input open -> wait_oclose", c->self);
- chan_shutdown_read(c);
- chan_send_ieof1(c);
- c->istate = CHAN_INPUT_WAIT_OCLOSE;
- } else {
- error("channel %d: istate %d != open", c->self, c->istate);
- }
- if (c->ostate == CHAN_OUTPUT_OPEN) {
- debug("channel %d: non-open: output open -> closed", c->self);
- chan_send_oclose1(c);
- c->ostate = CHAN_OUTPUT_CLOSED;
- } else {
- error("channel %d: ostate %d != open", c->self, c->ostate);
- }
- return;
- }
- switch (c->ostate) {
- case CHAN_OUTPUT_OPEN:
- debug("channel %d: output open -> drain", c->self);
- c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
- break;
- case CHAN_OUTPUT_WAIT_IEOF:
- debug("channel %d: output wait_ieof -> closed", c->self);
- c->ostate = CHAN_OUTPUT_CLOSED;
- break;
- default:
- error("channel %d: protocol error: chan_rcvd_ieof for ostate %d",
- c->self, c->ostate);
- break;
- }
-}
-static void
-chan_write_failed1(Channel *c)
-{
- debug("channel %d: write failed", c->self);
- switch (c->ostate) {
- case CHAN_OUTPUT_OPEN:
- debug("channel %d: output open -> wait_ieof", c->self);
- chan_send_oclose1(c);
- c->ostate = CHAN_OUTPUT_WAIT_IEOF;
- break;
- case CHAN_OUTPUT_WAIT_DRAIN:
- debug("channel %d: output wait_drain -> closed", c->self);
- chan_send_oclose1(c);
- c->ostate = CHAN_OUTPUT_CLOSED;
- break;
- default:
- error("channel %d: internal error: chan_write_failed for ostate %d",
- c->self, c->ostate);
- break;
- }
-}
-static void
-chan_obuf_empty1(Channel *c)
-{
- debug("channel %d: obuf empty", c->self);
- if (buffer_len(&c->output)) {
- error("channel %d: internal error: chan_obuf_empty for non empty buffer",
- c->self);
- return;
- }
- switch (c->ostate) {
- case CHAN_OUTPUT_WAIT_DRAIN:
- debug("channel %d: output drain -> closed", c->self);
- chan_send_oclose1(c);
- c->ostate = CHAN_OUTPUT_CLOSED;
- break;
- default:
- error("channel %d: internal error: chan_obuf_empty for ostate %d",
- c->self, c->ostate);
- break;
- }
-}
-static void
-chan_send_ieof1(Channel *c)
-{
- debug("channel %d: send ieof", c->self);
- switch (c->istate) {
- case CHAN_INPUT_OPEN:
- case CHAN_INPUT_WAIT_DRAIN:
- packet_start(SSH_MSG_CHANNEL_INPUT_EOF);
- packet_put_int(c->remote_id);
- packet_send();
- break;
- default:
- error("channel %d: internal error: cannot send ieof for istate %d",
- c->self, c->istate);
- break;
- }
-}
-static void
-chan_send_oclose1(Channel *c)
-{
- debug("channel %d: send oclose", c->self);
- switch (c->ostate) {
- case CHAN_OUTPUT_OPEN:
- case CHAN_OUTPUT_WAIT_DRAIN:
- chan_shutdown_write(c);
- buffer_consume(&c->output, buffer_len(&c->output));
- packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE);
- packet_put_int(c->remote_id);
- packet_send();
- break;
- default:
- error("channel %d: internal error: cannot send oclose for ostate %d",
- c->self, c->ostate);
- break;
- }
-}
-static void
-chan_delete_if_full_closed1(Channel *c)
-{
- if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
- debug("channel %d: full closed", c->self);
- channel_free(c->self);
- }
-}
-
-/*
- * the same for SSH2
- */
-static void
-chan_rcvd_oclose2(Channel *c)
-{
- debug("channel %d: rcvd close", c->self);
- if (c->flags & CHAN_CLOSE_RCVD)
- error("channel %d: protocol error: close rcvd twice", c->self);
- c->flags |= CHAN_CLOSE_RCVD;
- if (c->type == SSH_CHANNEL_LARVAL) {
- /* tear down larval channels immediately */
- c->ostate = CHAN_OUTPUT_CLOSED;
- c->istate = CHAN_INPUT_CLOSED;
- return;
- }
- switch (c->ostate) {
- case CHAN_OUTPUT_OPEN:
- /* wait until a data from the channel is consumed if a CLOSE is received */
- debug("channel %d: output open -> drain", c->self);
- c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
- break;
- }
- switch (c->istate) {
- case CHAN_INPUT_OPEN:
- debug("channel %d: input open -> closed", c->self);
- chan_shutdown_read(c);
- break;
- case CHAN_INPUT_WAIT_DRAIN:
- debug("channel %d: input drain -> closed", c->self);
- chan_send_eof2(c);
- break;
- }
- c->istate = CHAN_INPUT_CLOSED;
-}
-static void
-chan_ibuf_empty2(Channel *c)
-{
- debug("channel %d: ibuf empty", c->self);
- if (buffer_len(&c->input)) {
- error("channel %d: internal error: chan_ibuf_empty for non empty buffer",
- c->self);
- return;
- }
- switch (c->istate) {
- case CHAN_INPUT_WAIT_DRAIN:
- debug("channel %d: input drain -> closed", c->self);
- if (!(c->flags & CHAN_CLOSE_SENT))
- chan_send_eof2(c);
- c->istate = CHAN_INPUT_CLOSED;
- break;
- default:
- error("channel %d: internal error: chan_ibuf_empty for istate %d",
- c->self, c->istate);
- break;
- }
-}
-static void
-chan_rcvd_ieof2(Channel *c)
-{
- debug("channel %d: rcvd eof", c->self);
- if (c->ostate == CHAN_OUTPUT_OPEN) {
- debug("channel %d: output open -> drain", c->self);
- c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
- }
-}
-static void
-chan_write_failed2(Channel *c)
-{
- debug("channel %d: write failed", c->self);
- switch (c->ostate) {
- case CHAN_OUTPUT_OPEN:
- debug("channel %d: output open -> closed", c->self);
- chan_shutdown_write(c); /* ?? */
- c->ostate = CHAN_OUTPUT_CLOSED;
- break;
- case CHAN_OUTPUT_WAIT_DRAIN:
- debug("channel %d: output drain -> closed", c->self);
- chan_shutdown_write(c);
- c->ostate = CHAN_OUTPUT_CLOSED;
- break;
- default:
- error("channel %d: internal error: chan_write_failed for ostate %d",
- c->self, c->ostate);
- break;
- }
-}
-static void
-chan_obuf_empty2(Channel *c)
-{
- debug("channel %d: obuf empty", c->self);
- if (buffer_len(&c->output)) {
- error("internal error: chan_obuf_empty %d for non empty buffer",
- c->self);
- return;
- }
- switch (c->ostate) {
- case CHAN_OUTPUT_WAIT_DRAIN:
- debug("channel %d: output drain -> closed", c->self);
- chan_shutdown_write(c);
- c->ostate = CHAN_OUTPUT_CLOSED;
- break;
- default:
- error("channel %d: internal error: chan_obuf_empty for ostate %d",
- c->self, c->ostate);
- break;
- }
-}
-static void
-chan_send_eof2(Channel *c)
-{
- debug("channel %d: send eof", c->self);
- switch (c->istate) {
- case CHAN_INPUT_WAIT_DRAIN:
- packet_start(SSH2_MSG_CHANNEL_EOF);
- packet_put_int(c->remote_id);
- packet_send();
- break;
- default:
- error("channel %d: internal error: cannot send eof for istate %d",
- c->self, c->istate);
- break;
- }
-}
-static void
-chan_send_close2(Channel *c)
-{
- debug("channel %d: send close", c->self);
- if (c->ostate != CHAN_OUTPUT_CLOSED ||
- c->istate != CHAN_INPUT_CLOSED) {
- error("channel %d: internal error: cannot send close for istate/ostate %d/%d",
- c->self, c->istate, c->ostate);
- } else if (c->flags & CHAN_CLOSE_SENT) {
- error("channel %d: internal error: already sent close", c->self);
- } else {
- packet_start(SSH2_MSG_CHANNEL_CLOSE);
- packet_put_int(c->remote_id);
- packet_send();
- c->flags |= CHAN_CLOSE_SENT;
- }
-}
-static void
-chan_delete_if_full_closed2(Channel *c)
-{
- if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
- if (!(c->flags & CHAN_CLOSE_SENT)) {
- chan_send_close2(c);
- }
- if ((c->flags & CHAN_CLOSE_SENT) &&
- (c->flags & CHAN_CLOSE_RCVD)) {
- debug("channel %d: full closed2", c->self);
- channel_free(c->self);
- }
- }
-}
-
-/* shared */
-void
-chan_init_iostates(Channel *c)
-{
- c->ostate = CHAN_OUTPUT_OPEN;
- c->istate = CHAN_INPUT_OPEN;
- c->flags = 0;
-}
-
-/* init */
-void
-chan_init(void)
-{
- if (compat20) {
- chan_rcvd_oclose = chan_rcvd_oclose2;
- chan_read_failed = chan_read_failed_12;
- chan_ibuf_empty = chan_ibuf_empty2;
-
- chan_rcvd_ieof = chan_rcvd_ieof2;
- chan_write_failed = chan_write_failed2;
- chan_obuf_empty = chan_obuf_empty2;
-
- chan_delete_if_full_closed = chan_delete_if_full_closed2;
- } else {
- chan_rcvd_oclose = chan_rcvd_oclose1;
- chan_read_failed = chan_read_failed_12;
- chan_ibuf_empty = chan_ibuf_empty1;
-
- chan_rcvd_ieof = chan_rcvd_ieof1;
- chan_write_failed = chan_write_failed1;
- chan_obuf_empty = chan_obuf_empty1;
-
- chan_delete_if_full_closed = chan_delete_if_full_closed1;
- }
-}
-
-/* helper */
-static void
-chan_shutdown_write(Channel *c)
-{
- buffer_consume(&c->output, buffer_len(&c->output));
- if (compat20 && c->type == SSH_CHANNEL_LARVAL)
- return;
- /* shutdown failure is allowed if write failed already */
- debug("channel %d: close_write", c->self);
- if (c->sock != -1) {
- if (shutdown(c->sock, SHUT_WR) < 0)
- debug("channel %d: chan_shutdown_write: shutdown() failed for fd%d: %.100s",
- c->self, c->sock, strerror(errno));
- } else {
- if (close(c->wfd) < 0)
- log("channel %d: chan_shutdown_write: close() failed for fd%d: %.100s",
- c->self, c->wfd, strerror(errno));
- c->wfd = -1;
- }
-}
-static void
-chan_shutdown_read(Channel *c)
-{
- if (compat20 && c->type == SSH_CHANNEL_LARVAL)
- return;
- debug("channel %d: close_read", c->self);
- if (c->sock != -1) {
- if (shutdown(c->sock, SHUT_RD) < 0)
- error("channel %d: chan_shutdown_read: shutdown() failed for fd%d [i%d o%d]: %.100s",
- c->self, c->sock, c->istate, c->ostate, strerror(errno));
- } else {
- if (close(c->rfd) < 0)
- log("channel %d: chan_shutdown_read: close() failed for fd%d: %.100s",
- c->self, c->rfd, strerror(errno));
- c->rfd = -1;
- }
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 13:27:37 +0000