+/* $OpenBSD: nchan.c,v 1.63 2010/01/26 01:28:35 djm Exp $ */
/*
- * Copyright (c) 1999, 2000, 2001 Markus Friedl. All rights reserved.
+ * 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
*/
#include "includes.h"
-RCSID("$OpenBSD: nchan.c,v 1.38 2002/01/14 13:22:35 markus Exp $");
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <errno.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include "openbsd-compat/sys-queue.h"
#include "ssh1.h"
#include "ssh2.h"
#include "buffer.h"
* tear down of channels:
*
* 1.3: strict request-ack-protocol:
- * CLOSE ->
- * <- CLOSE_CONFIRM
+ * CLOSE ->
+ * <- CLOSE_CONFIRM
*
* 1.5: uses variations of:
- * IEOF ->
- * <- OCLOSE
- * <- IEOF
- * OCLOSE ->
- * i.e. both sides have to close the channel
+ * IEOF ->
+ * <- OCLOSE
+ * <- IEOF
+ * OCLOSE ->
+ * i.e. both sides have to close the channel
*
* 2.0: the EOF messages are optional
*
/*
* 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_oclose1(Channel *);
static void chan_send_close2(Channel *);
static void chan_send_eof2(Channel *);
+static void chan_send_eow2(Channel *);
/* helper */
static void chan_shutdown_write(Channel *);
{
if (c->istate > CHAN_INPUT_CLOSED || next > CHAN_INPUT_CLOSED)
fatal("chan_set_istate: bad state %d -> %d", c->istate, next);
- debug("channel %d: input %s -> %s", c->self, istates[c->istate],
+ debug2("channel %d: input %s -> %s", c->self, istates[c->istate],
istates[next]);
c->istate = next;
}
{
if (c->ostate > CHAN_OUTPUT_CLOSED || next > CHAN_OUTPUT_CLOSED)
fatal("chan_set_ostate: bad state %d -> %d", c->ostate, next);
- debug("channel %d: output %s -> %s", c->self, ostates[c->ostate],
+ debug2("channel %d: output %s -> %s", c->self, ostates[c->ostate],
ostates[next]);
c->ostate = next;
}
static void
chan_rcvd_oclose1(Channel *c)
{
- debug("channel %d: rcvd oclose", c->self);
+ debug2("channel %d: rcvd oclose", c->self);
switch (c->istate) {
case CHAN_INPUT_WAIT_OCLOSE:
chan_set_istate(c, CHAN_INPUT_CLOSED);
return;
}
}
-static void
-chan_read_failed_12(Channel *c)
+void
+chan_read_failed(Channel *c)
{
- debug("channel %d: read failed", c->self);
+ debug2("channel %d: read failed", c->self);
switch (c->istate) {
case CHAN_INPUT_OPEN:
chan_shutdown_read(c);
break;
}
}
-static void
-chan_ibuf_empty1(Channel *c)
+void
+chan_ibuf_empty(Channel *c)
{
- debug("channel %d: ibuf empty", c->self);
+ debug2("channel %d: ibuf empty", c->self);
if (buffer_len(&c->input)) {
error("channel %d: chan_ibuf_empty for non empty buffer",
c->self);
}
switch (c->istate) {
case CHAN_INPUT_WAIT_DRAIN:
- chan_send_ieof1(c);
- chan_set_istate(c, CHAN_INPUT_WAIT_OCLOSE);
+ if (compat20) {
+ if (!(c->flags & (CHAN_CLOSE_SENT|CHAN_LOCAL)))
+ 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",
static void
chan_rcvd_ieof1(Channel *c)
{
- debug("channel %d: rcvd ieof", c->self);
+ debug2("channel %d: rcvd ieof", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
static void
chan_write_failed1(Channel *c)
{
- debug("channel %d: write failed", c->self);
+ debug2("channel %d: write failed", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
chan_shutdown_write(c);
break;
}
}
-static void
-chan_obuf_empty1(Channel *c)
+void
+chan_obuf_empty(Channel *c)
{
- debug("channel %d: obuf empty", c->self);
+ debug2("channel %d: obuf empty", c->self);
if (buffer_len(&c->output)) {
error("channel %d: chan_obuf_empty for non empty buffer",
c->self);
switch (c->ostate) {
case CHAN_OUTPUT_WAIT_DRAIN:
chan_shutdown_write(c);
- chan_send_oclose1(c);
+ if (!compat20)
+ chan_send_oclose1(c);
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
break;
default:
static void
chan_send_ieof1(Channel *c)
{
- debug("channel %d: send ieof", c->self);
+ debug2("channel %d: send ieof", c->self);
switch (c->istate) {
case CHAN_INPUT_OPEN:
case CHAN_INPUT_WAIT_DRAIN:
static void
chan_send_oclose1(Channel *c)
{
- debug("channel %d: send oclose", c->self);
+ debug2("channel %d: send oclose", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
case CHAN_OUTPUT_WAIT_DRAIN:
* the same for SSH2
*/
static void
-chan_rcvd_oclose2(Channel *c)
+chan_rcvd_close2(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;
+ debug2("channel %d: rcvd close", c->self);
+ if (!(c->flags & CHAN_LOCAL)) {
+ 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);
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);
+ if (!(c->flags & CHAN_LOCAL))
+ chan_send_eof2(c);
+ chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
}
- chan_set_istate(c, CHAN_INPUT_CLOSED);
}
-static void
-chan_ibuf_empty2(Channel *c)
+
+void
+chan_rcvd_eow(Channel *c)
{
- debug("channel %d: ibuf empty", c->self);
- if (buffer_len(&c->input)) {
- error("channel %d: chan_ibuf_empty for non empty buffer",
- c->self);
- return;
- }
+ debug2("channel %d: rcvd eow", c->self);
switch (c->istate) {
- case CHAN_INPUT_WAIT_DRAIN:
- if (!(c->flags & CHAN_CLOSE_SENT))
- chan_send_eof2(c);
+ case CHAN_INPUT_OPEN:
+ chan_shutdown_read(c);
chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
- default:
- error("channel %d: chan_ibuf_empty for istate %d",
- c->self, c->istate);
- break;
}
}
static void
-chan_rcvd_ieof2(Channel *c)
+chan_rcvd_eof2(Channel *c)
{
- debug("channel %d: rcvd eof", c->self);
+ 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)
{
- debug("channel %d: write failed", c->self);
+ debug2("channel %d: write failed", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
- chan_shutdown_write(c); /* ?? */
- chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
- break;
case CHAN_OUTPUT_WAIT_DRAIN:
chan_shutdown_write(c);
+ if (strcmp(c->ctype, "session") == 0)
+ chan_send_eow2(c);
chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
break;
default:
}
}
static void
-chan_obuf_empty2(Channel *c)
-{
- debug("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);
- chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
- break;
- default:
- error("channel %d: 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);
+ 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",
static void
chan_send_close2(Channel *c)
{
- debug("channel %d: send close", c->self);
+ 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->flags |= CHAN_CLOSE_SENT;
}
}
+static void
+chan_send_eow2(Channel *c)
+{
+ debug2("channel %d: send eow", c->self);
+ if (c->ostate == CHAN_OUTPUT_CLOSED) {
+ error("channel %d: must not sent eow on closed output",
+ c->self);
+ return;
+ }
+ if (!(datafellows & SSH_NEW_OPENSSH))
+ return;
+ packet_start(SSH2_MSG_CHANNEL_REQUEST);
+ packet_put_int(c->remote_id);
+ packet_put_cstring("eow@openssh.com");
+ packet_put_char(0);
+ packet_send();
+}
/* 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)
{
}
int
-chan_is_dead(Channel *c, int send)
+chan_is_dead(Channel *c, int do_send)
{
if (c->type == SSH_CHANNEL_ZOMBIE) {
- debug("channel %d: zombie", c->self);
+ debug2("channel %d: zombie", c->self);
return 1;
}
if (c->istate != CHAN_INPUT_CLOSED || c->ostate != CHAN_OUTPUT_CLOSED)
return 0;
if (!compat20) {
- debug("channel %d: is dead", c->self);
+ debug2("channel %d: is dead", c->self);
return 1;
}
- /*
- * we have to delay the close message if the efd (for stderr) is
- * still active
- */
- if (((c->extended_usage != CHAN_EXTENDED_IGNORE) &&
- buffer_len(&c->extended) > 0)
-#if 0
- || ((c->extended_usage == CHAN_EXTENDED_READ) &&
- c->efd != -1)
-#endif
- ) {
- debug2("channel %d: active efd: %d len %d type %s",
- c->self, c->efd, buffer_len(&c->extended),
- c->extended_usage==CHAN_EXTENDED_READ ?
- "read": "write");
- } else {
- if (!(c->flags & CHAN_CLOSE_SENT)) {
- if (send) {
- chan_send_close2(c);
- } else {
- /* channel would be dead if we sent a close */
- if (c->flags & CHAN_CLOSE_RCVD) {
- debug("channel %d: almost 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_LOCAL) {
+ debug2("channel %d: is dead (local)", c->self);
+ return 1;
+ }
+ 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)) {
- debug("channel %d: is dead", c->self);
- return 1;
- }
}
- return 0;
-}
-
-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;
- } 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;
+ if ((c->flags & CHAN_CLOSE_SENT) &&
+ (c->flags & CHAN_CLOSE_RCVD)) {
+ debug2("channel %d: is dead", c->self);
+ return 1;
}
+ return 0;
}
/* helper */
if (compat20 && c->type == SSH_CHANNEL_LARVAL)
return;
/* shutdown failure is allowed if write failed already */
- debug("channel %d: close_write", c->self);
+ debug2("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",
+ 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)
- log("channel %d: chan_shutdown_write: "
- "close() failed for fd%d: %.100s",
+ logit("channel %d: chan_shutdown_write: "
+ "close() failed for fd %d: %.100s",
c->self, c->wfd, strerror(errno));
}
}
{
if (compat20 && c->type == SSH_CHANNEL_LARVAL)
return;
- debug("channel %d: close_read", c->self);
+ debug2("channel %d: close_read", c->self);
if (c->sock != -1) {
/*
* shutdown(sock, SHUT_READ) may return ENOTCONN if the
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",
+ "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)
- log("channel %d: chan_shutdown_read: "
- "close() failed for fd%d: %.100s",
+ logit("channel %d: chan_shutdown_read: "
+ "close() failed for fd %d: %.100s",
c->self, c->rfd, strerror(errno));
}
}
andersk / openssh.git / blobdiff