-/* $OpenBSD: nchan.c,v 1.62 2008/11/07 18:50:18 stevesk Exp $ */
/*
- * Copyright (c) 1999, 2000, 2001, 2002 Markus Friedl. All rights reserved.
+ * Copyright (c) 1999, 2000, 2001 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 1.32 2001/10/10 22:18:47 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 *);
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);
+ debug("channel %d: rcvd oclose", c->self);
switch (c->istate) {
case CHAN_INPUT_WAIT_OCLOSE:
- chan_set_istate(c, CHAN_INPUT_CLOSED);
+ 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);
- chan_set_istate(c, CHAN_INPUT_CLOSED);
+ 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);
- chan_set_istate(c, CHAN_INPUT_CLOSED);
+ c->istate = CHAN_INPUT_CLOSED;
break;
default:
error("channel %d: protocol error: rcvd_oclose for istate %d",
return;
}
}
-void
-chan_read_failed(Channel *c)
+static void
+chan_read_failed_12(Channel *c)
{
- debug2("channel %d: read failed", c->self);
+ 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);
- chan_set_istate(c, CHAN_INPUT_WAIT_DRAIN);
+ c->istate = CHAN_INPUT_WAIT_DRAIN;
+#if 0
+ if (buffer_len(&c->input) == 0) {
+ debug("channel %d: input: no drain shortcut", c->self);
+ chan_ibuf_empty(c);
+ }
+#endif
break;
default:
error("channel %d: chan_read_failed for istate %d",
break;
}
}
-void
-chan_ibuf_empty(Channel *c)
+static void
+chan_ibuf_empty1(Channel *c)
{
- debug2("channel %d: ibuf empty", c->self);
+ debug("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:
- 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);
- }
+ debug("channel %d: input drain -> wait_oclose", c->self);
+ chan_send_ieof1(c);
+ c->istate = CHAN_INPUT_WAIT_OCLOSE;
break;
default:
error("channel %d: chan_ibuf_empty for istate %d",
static void
chan_rcvd_ieof1(Channel *c)
{
- debug2("channel %d: rcvd ieof", c->self);
+ 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: non-open: 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: non-open: ostate %d != open",
+ c->self, c->ostate);
+ }
+ return;
+ }
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
- chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
+ debug("channel %d: output open -> drain", c->self);
+ c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
break;
case CHAN_OUTPUT_WAIT_IEOF:
- chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
+ debug("channel %d: output wait_ieof -> closed", c->self);
+ c->ostate = CHAN_OUTPUT_CLOSED;
break;
default:
error("channel %d: protocol error: rcvd_ieof for ostate %d",
static void
chan_write_failed1(Channel *c)
{
- debug2("channel %d: write failed", c->self);
+ debug("channel %d: write failed", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
- chan_shutdown_write(c);
+ debug("channel %d: output open -> wait_ieof", c->self);
chan_send_oclose1(c);
- chan_set_ostate(c, CHAN_OUTPUT_WAIT_IEOF);
+ c->ostate = CHAN_OUTPUT_WAIT_IEOF;
break;
case CHAN_OUTPUT_WAIT_DRAIN:
- chan_shutdown_write(c);
+ debug("channel %d: output wait_drain -> closed", c->self);
chan_send_oclose1(c);
- chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
+ c->ostate = CHAN_OUTPUT_CLOSED;
break;
default:
error("channel %d: chan_write_failed for ostate %d",
break;
}
}
-void
-chan_obuf_empty(Channel *c)
+static void
+chan_obuf_empty1(Channel *c)
{
- debug2("channel %d: obuf empty", c->self);
+ debug("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);
- if (!compat20)
- chan_send_oclose1(c);
- chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
+ debug("channel %d: output drain -> closed", c->self);
+ chan_send_oclose1(c);
+ c->ostate = CHAN_OUTPUT_CLOSED;
break;
default:
error("channel %d: internal error: obuf_empty for ostate %d",
static void
chan_send_ieof1(Channel *c)
{
- debug2("channel %d: send ieof", c->self);
+ debug("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)
{
- debug2("channel %d: send oclose", c->self);
+ debug("channel %d: send oclose", c->self);
switch (c->ostate) {
case CHAN_OUTPUT_OPEN:
case CHAN_OUTPUT_WAIT_DRAIN:
- buffer_clear(&c->output);
+ 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: cannot send oclose for ostate %d",
- c->self, c->ostate);
+ c->self, c->ostate);
break;
}
}
* the same for SSH2
*/
static void
-chan_rcvd_close2(Channel *c)
+chan_rcvd_oclose2(Channel *c)
{
- debug2("channel %d: rcvd close", c->self);
+ 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 */
- chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
- chan_set_istate(c, CHAN_INPUT_CLOSED);
+ c->ostate = CHAN_OUTPUT_CLOSED;
+ c->istate = CHAN_INPUT_CLOSED;
return;
}
switch (c->ostate) {
* wait until a data from the channel is consumed if a CLOSE
* is received
*/
- chan_set_ostate(c, CHAN_OUTPUT_WAIT_DRAIN);
+ 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);
- chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
case CHAN_INPUT_WAIT_DRAIN:
+ debug("channel %d: input drain -> closed", c->self);
chan_send_eof2(c);
- chan_set_istate(c, CHAN_INPUT_CLOSED);
break;
}
+ c->istate = CHAN_INPUT_CLOSED;
}
-void
-chan_rcvd_eow(Channel *c)
+static void
+chan_ibuf_empty2(Channel *c)
{
- debug2("channel %d: rcvd eow", c->self);
+ 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;
+ }
switch (c->istate) {
- case CHAN_INPUT_OPEN:
- chan_shutdown_read(c);
- chan_set_istate(c, CHAN_INPUT_CLOSED);
+ 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: chan_ibuf_empty for istate %d",
+ c->self, c->istate);
break;
}
}
static void
-chan_rcvd_eof2(Channel *c)
+chan_rcvd_ieof2(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);
+ 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)
{
- debug2("channel %d: write failed", c->self);
+ 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);
- if (strcmp(c->ctype, "session") == 0)
- chan_send_eow2(c);
- chan_set_ostate(c, CHAN_OUTPUT_CLOSED);
+ c->ostate = CHAN_OUTPUT_CLOSED;
break;
default:
error("channel %d: chan_write_failed for ostate %d",
}
}
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:
+ debug("channel %d: output drain -> closed", c->self);
+ chan_shutdown_write(c);
+ c->ostate = 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)
{
- debug2("channel %d: send eof", c->self);
+ 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();
- c->flags |= CHAN_EOF_SENT;
break;
default:
error("channel %d: cannot send eof for istate %d",
static void
chan_send_close2(Channel *c)
{
- debug2("channel %d: send close", c->self);
+ debug("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 do_send)
+chan_is_dead(Channel *c, int send)
{
if (c->type == SSH_CHANNEL_ZOMBIE) {
- debug2("channel %d: zombie", c->self);
+ debug("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);
+ debug("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;
+ /*
+ * 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 ((c->flags & CHAN_CLOSE_SENT) &&
- (c->flags & CHAN_CLOSE_RCVD)) {
- debug2("channel %d: is 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;
+ }
+}
+
/* helper */
static void
chan_shutdown_write(Channel *c)
{
- buffer_clear(&c->output);
+ buffer_consume(&c->output, buffer_len(&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);
+ debug("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",
+ debug("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",
+ log("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;
- debug2("channel %d: close_read", c->self);
+ debug("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)
- logit("channel %d: chan_shutdown_read: "
- "close() failed for fd %d: %.100s",
+ log("channel %d: chan_shutdown_read: "
+ "close() failed for fd%d: %.100s",
c->self, c->rfd, strerror(errno));
}
}
andersk / gssapi-openssh.git / blobdiff