diff options
Diffstat (limited to 'crypto/openssh/nchan.c')
-rw-r--r-- | crypto/openssh/nchan.c | 490 |
1 files changed, 0 insertions, 490 deletions
diff --git a/crypto/openssh/nchan.c b/crypto/openssh/nchan.c deleted file mode 100644 index ad461f4..0000000 --- a/crypto/openssh/nchan.c +++ /dev/null @@ -1,490 +0,0 @@ -/* $OpenBSD: nchan.c,v 1.57 2006/08/03 03:34:42 deraadt Exp $ */ -/* - * Copyright (c) 1999, 2000, 2001, 2002 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" - -#include <sys/types.h> -#include <sys/socket.h> - -#include <errno.h> -#include <string.h> -#include <stdarg.h> - -#include "ssh1.h" -#include "ssh2.h" -#include "buffer.h" -#include "packet.h" -#include "channels.h" -#include "compat.h" -#include "log.h" - -/* - * SSH Protocol 1.5 aka New Channel Protocol - * Thanks to Martina, Axel and everyone who left Erlangen, leaving me bored. - * Written by Markus Friedl in October 1999 - * - * Protocol versions 1.3 and 1.5 differ in the handshake protocol used for the - * tear down of channels: - * - * 1.3: strict request-ack-protocol: - * CLOSE -> - * <- CLOSE_CONFIRM - * - * 1.5: uses variations of: - * IEOF -> - * <- OCLOSE - * <- IEOF - * OCLOSE -> - * i.e. both sides have to close the channel - * - * 2.0: the EOF messages are optional - * - * See the debugging output from 'ssh -v' and 'sshd -d' of - * ssh-1.2.27 as an example. - * - */ - -/* functions manipulating channel states */ -/* - * EVENTS update channel input/output states execute ACTIONS - */ -/* - * ACTIONS: should never update the channel states - */ -static void chan_send_ieof1(Channel *); -static void chan_send_oclose1(Channel *); -static void chan_send_close2(Channel *); -static void chan_send_eof2(Channel *); - -/* helper */ -static void chan_shutdown_write(Channel *); -static void chan_shutdown_read(Channel *); - -static char *ostates[] = { "open", "drain", "wait_ieof", "closed" }; -static char *istates[] = { "open", "drain", "wait_oclose", "closed" }; - -static void -chan_set_istate(Channel *c, u_int next) -{ - if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED) - fatal("chan_set_istate: bad state %d -> %d", c->istate, next); - debug2("channel %d: input %s -> %s", c->self, istates[c->istate], - istates[next]); - c->istate = next; -} -static void -chan_set_ostate(Channel *c, u_int next) -{ - if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED) - fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next); - debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate], - ostates[next]); - c->ostate = next; -} - -/* - * SSH1 specific implementation of event functions - */ - -static void -chan_rcvd_oclose1(Channel *c) -{ - debug2("channel %d: rcvd oclose", c->self); - switch (c->istate) { - case CHAN_INPUT_WAIT_OCLOSE: - chan_set_istate(c, CHAN_INPUT_CLOSED); - break; - case CHAN_INPUT_OPEN: - chan_shutdown_read(c); - chan_send_ieof1(c); - chan_set_istate(c, CHAN_INPUT_CLOSED); - break; - case CHAN_INPUT_WAIT_DRAIN: - /* both local read_failed and remote write_failed */ - chan_send_ieof1(c); - chan_set_istate(c, CHAN_INPUT_CLOSED); - break; - default: - error("channel %d: protocol error: rcvd_oclose for istate %d", - c->self, c->istate); - return; - } -} -void -chan_read_failed(Channel *c) -{ - debug2("channel %d: read failed", c->self); - switch (c->istate) { - case CHAN_INPUT_OPEN: - chan_shutdown_read(c); - chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN); - break; - default: - error("channel %d: chan_read_failed for istate %d", - c->self, c->istate); - break; - } -} -void -chan_ibuf_empty(Channel *c) -{ - debug2("channel %d: ibuf empty", c->self); - if (buffer_len(&c->input)) { - error("channel %d: chan_ibuf_empty for non empty buffer", - c->self); - return; - } - switch (c->istate) { - case CHAN_INPUT_WAIT_DRAIN: - if (compat20) { - if (!(c->flags & CHAN_CLOSE_SENT)) - chan_send_eof2(c); - chan_set_istate(c, CHAN_INPUT_CLOSED); - } else { - chan_send_ieof1(c); - chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE); - } - break; - default: - error("channel %d: chan_ibuf_empty for istate %d", - c->self, c->istate); - break; - } -} -static void -chan_rcvd_ieof1(Channel *c) -{ - debug2("channel %d: rcvd ieof", c->self); - switch (c->ostate) { - case CHAN_OUTPUT_OPEN: - chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); - break; - case CHAN_OUTPUT_WAIT_IEOF: - chan_set_ostate(c, CHAN_OUTPUT_CLOSED); - break; - default: - error("channel %d: protocol error: rcvd_ieof for ostate %d", - c->self, c->ostate); - break; - } -} -static void -chan_write_failed1(Channel *c) -{ - debug2("channel %d: write failed", c->self); - switch (c->ostate) { - case CHAN_OUTPUT_OPEN: - chan_shutdown_write(c); - chan_send_oclose1(c); - chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF); - break; - case CHAN_OUTPUT_WAIT_DRAIN: - chan_shutdown_write(c); - chan_send_oclose1(c); - chan_set_ostate(c, CHAN_OUTPUT_CLOSED); - break; - default: - error("channel %d: chan_write_failed for ostate %d", - c->self, c->ostate); - break; - } -} -void -chan_obuf_empty(Channel *c) -{ - debug2("channel %d: obuf empty", c->self); - if (buffer_len(&c->output)) { - error("channel %d: chan_obuf_empty for non empty buffer", - c->self); - return; - } - switch (c->ostate) { - case CHAN_OUTPUT_WAIT_DRAIN: - chan_shutdown_write(c); - if (!compat20) - chan_send_oclose1(c); - chan_set_ostate(c, CHAN_OUTPUT_CLOSED); - break; - default: - error("channel %d: internal error: obuf_empty for ostate %d", - c->self, c->ostate); - break; - } -} -static void -chan_send_ieof1(Channel *c) -{ - debug2("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: cannot send ieof for istate %d", - c->self, c->istate); - break; - } -} -static void -chan_send_oclose1(Channel *c) -{ - debug2("channel %d: send oclose", c->self); - switch (c->ostate) { - case CHAN_OUTPUT_OPEN: - case CHAN_OUTPUT_WAIT_DRAIN: - buffer_clear(&c->output); - packet_start(SSH_MSG_CHANNEL_OUTPUT_CLOSE); - packet_put_int(c->remote_id); - packet_send(); - break; - default: - error("channel %d: cannot send oclose for ostate %d", - c->self, c->ostate); - break; - } -} - -/* - * the same for SSH2 - */ -static void -chan_rcvd_close2(Channel *c) -{ - debug2("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 */ - chan_set_ostate(c, CHAN_OUTPUT_CLOSED); - chan_set_istate(c, 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 - */ - chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); - break; - } - switch (c->istate) { - case CHAN_INPUT_OPEN: - chan_shutdown_read(c); - chan_set_istate(c, CHAN_INPUT_CLOSED); - break; - case CHAN_INPUT_WAIT_DRAIN: - chan_send_eof2(c); - chan_set_istate(c, CHAN_INPUT_CLOSED); - break; - } -} -static void -chan_rcvd_eof2(Channel *c) -{ - debug2("channel %d: rcvd eof", c->self); - c->flags |= CHAN_EOF_RCVD; - if (c->ostate == CHAN_OUTPUT_OPEN) - chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN); -} -static void -chan_write_failed2(Channel *c) -{ - debug2("channel %d: write failed", c->self); - switch (c->ostate) { - case CHAN_OUTPUT_OPEN: - case CHAN_OUTPUT_WAIT_DRAIN: - chan_shutdown_write(c); - chan_set_ostate(c, CHAN_OUTPUT_CLOSED); - break; - default: - error("channel %d: chan_write_failed for ostate %d", - c->self, c->ostate); - break; - } -} -static void -chan_send_eof2(Channel *c) -{ - debug2("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(); - c->flags |= CHAN_EOF_SENT; - break; - default: - error("channel %d: cannot send eof for istate %d", - c->self, c->istate); - break; - } -} -static void -chan_send_close2(Channel *c) -{ - debug2("channel %d: send close", c->self); - if (c->ostate != CHAN_OUTPUT_CLOSED || - c->istate != CHAN_INPUT_CLOSED) { - error("channel %d: cannot send close for istate/ostate %d/%d", - c->self, c->istate, c->ostate); - } else if (c->flags & CHAN_CLOSE_SENT) { - error("channel %d: 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; - } -} - -/* shared */ - -void -chan_rcvd_ieof(Channel *c) -{ - if (compat20) - chan_rcvd_eof2(c); - else - chan_rcvd_ieof1(c); - if (c->ostate == CHAN_OUTPUT_WAIT_DRAIN && - buffer_len(&c->output) == 0 && - !CHANNEL_EFD_OUTPUT_ACTIVE(c)) - chan_obuf_empty(c); -} -void -chan_rcvd_oclose(Channel *c) -{ - if (compat20) - chan_rcvd_close2(c); - else - chan_rcvd_oclose1(c); -} -void -chan_write_failed(Channel *c) -{ - if (compat20) - chan_write_failed2(c); - else - chan_write_failed1(c); -} - -void -chan_mark_dead(Channel *c) -{ - c->type = SSH_CHANNEL_ZOMBIE; -} - -int -chan_is_dead(Channel *c, int do_send) -{ - if (c->type == SSH_CHANNEL_ZOMBIE) { - debug2("channel %d: zombie", c->self); - return 1; - } - if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED) - return 0; - if (!compat20) { - debug2("channel %d: is dead", c->self); - return 1; - } - if ((datafellows & SSH_BUG_EXTEOF) && - c->extended_usage == CHAN_EXTENDED_WRITE && - c->efd != -1 && - buffer_len(&c->extended) > 0) { - debug2("channel %d: active efd: %d len %d", - c->self, c->efd, buffer_len(&c->extended)); - return 0; - } - if (!(c->flags & CHAN_CLOSE_SENT)) { - if (do_send) { - chan_send_close2(c); - } else { - /* channel would be dead if we sent a close */ - if (c->flags & CHAN_CLOSE_RCVD) { - debug2("channel %d: almost dead", - c->self); - return 1; - } - } - } - if ((c->flags & CHAN_CLOSE_SENT) && - (c->flags & CHAN_CLOSE_RCVD)) { - debug2("channel %d: is dead", c->self); - return 1; - } - return 0; -} - -/* helper */ -static void -chan_shutdown_write(Channel *c) -{ - buffer_clear(&c->output); - if (compat20 && c->type == SSH_CHANNEL_LARVAL) - return; - /* shutdown failure is allowed if write failed already */ - debug2("channel %d: close_write", c->self); - if (c->sock != -1) { - if (shutdown(c->sock, SHUT_WR) < 0) - debug2("channel %d: chan_shutdown_write: " - "shutdown() failed for fd%d: %.100s", - c->self, c->sock, strerror(errno)); - } else { - if (channel_close_fd(&c->wfd) < 0) - logit("channel %d: chan_shutdown_write: " - "close() failed for fd%d: %.100s", - c->self, c->wfd, strerror(errno)); - } -} -static void -chan_shutdown_read(Channel *c) -{ - if (compat20 && c->type == SSH_CHANNEL_LARVAL) - return; - debug2("channel %d: close_read", c->self); - if (c->sock != -1) { - /* - * shutdown(sock, SHUT_READ) may return ENOTCONN if the - * write side has been closed already. (bug on Linux) - * HP-UX may return ENOTCONN also. - */ - if (shutdown(c->sock, SHUT_RD) < 0 - && errno != ENOTCONN) - 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 (channel_close_fd(&c->rfd) < 0) - logit("channel %d: chan_shutdown_read: " - "close() failed for fd%d: %.100s", - c->self, c->rfd, strerror(errno)); - } -} |