Vendor import of OpenSSH.

1 files changed, 238 insertions, 0 deletions

diff --git a/crypto/openssh/nchan.c b/crypto/openssh/nchan.c
new file mode 100644
index 0000000..1f30a7c
--- /dev/null
+++ b/crypto/openssh/nchan.c
@@ -0,0 +1,238 @@
+/*
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Markus Friedl.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * 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("$Id: nchan.c,v 1.10 2000/01/10 10:15:28 markus Exp $");
+
+#include "ssh.h"
+
+#include "buffer.h"
+#include "packet.h"
+#include "channels.h"
+#include "nchan.h"
+
+static void chan_send_ieof(Channel *c);
+static void chan_send_oclose(Channel *c);
+static void chan_shutdown_write(Channel *c);
+static void chan_shutdown_read(Channel *c);
+static void chan_delete_if_full_closed(Channel *c);
+
+/*
+ * EVENTS update channel input/output states execute ACTIONS
+ */
+
+/* events concerning the INPUT from socket for channel (istate) */
+void
+chan_rcvd_oclose(Channel *c)
+{
+	switch (c->istate) {
+	case CHAN_INPUT_WAIT_OCLOSE:
+		debug("channel %d: INPUT_WAIT_OCLOSE -> INPUT_CLOSED [rcvd OCLOSE]", c->self);
+		c->istate = CHAN_INPUT_CLOSED;
+		break;
+	case CHAN_INPUT_OPEN:
+		debug("channel %d: INPUT_OPEN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
+		chan_shutdown_read(c);
+		chan_send_ieof(c);
+		c->istate = CHAN_INPUT_CLOSED;
+		break;
+	case CHAN_INPUT_WAIT_DRAIN:
+		/* both local read_failed and remote write_failed  */
+		log("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
+		debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_CLOSED [rvcd OCLOSE, send IEOF]", c->self);
+		chan_send_ieof(c);
+		c->istate = CHAN_INPUT_CLOSED;
+		break;
+	default:
+		error("protocol error: chan_rcvd_oclose %d for istate %d", c->self, c->istate);
+		return;
+	}
+	chan_delete_if_full_closed(c);
+}
+void
+chan_read_failed(Channel *c)
+{
+	switch (c->istate) {
+	case CHAN_INPUT_OPEN:
+		debug("channel %d: INPUT_OPEN -> INPUT_WAIT_DRAIN [read failed]", c->self);
+		chan_shutdown_read(c);
+		c->istate = CHAN_INPUT_WAIT_DRAIN;
+		break;
+	default:
+		error("internal error: we do not read, but chan_read_failed %d for istate %d",
+		      c->self, c->istate);
+		break;
+	}
+}
+void
+chan_ibuf_empty(Channel *c)
+{
+	if (buffer_len(&c->input)) {
+		error("internal error: chan_ibuf_empty %d for non empty buffer", c->self);
+		return;
+	}
+	switch (c->istate) {
+	case CHAN_INPUT_WAIT_DRAIN:
+		debug("channel %d: INPUT_WAIT_DRAIN -> INPUT_WAIT_OCLOSE [inbuf empty, send IEOF]", c->self);
+		chan_send_ieof(c);
+		c->istate = CHAN_INPUT_WAIT_OCLOSE;
+		break;
+	default:
+		error("internal error: chan_ibuf_empty %d for istate %d", c->self, c->istate);
+		break;
+	}
+}
+
+/* events concerning the OUTPUT from channel for socket (ostate) */
+void
+chan_rcvd_ieof(Channel *c)
+{
+	switch (c->ostate) {
+	case CHAN_OUTPUT_OPEN:
+		debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_DRAIN [rvcd IEOF]", c->self);
+		c->ostate = CHAN_OUTPUT_WAIT_DRAIN;
+		break;
+	case CHAN_OUTPUT_WAIT_IEOF:
+		debug("channel %d: OUTPUT_WAIT_IEOF -> OUTPUT_CLOSED [rvcd IEOF]", c->self);
+		c->ostate = CHAN_OUTPUT_CLOSED;
+		chan_delete_if_full_closed(c);
+		break;
+	default:
+		error("protocol error: chan_rcvd_ieof %d for ostate %d", c->self, c->ostate);
+		break;
+	}
+}
+void
+chan_write_failed(Channel *c)
+{
+	switch (c->ostate) {
+	case CHAN_OUTPUT_OPEN:
+		debug("channel %d: OUTPUT_OPEN -> OUTPUT_WAIT_IEOF [write failed]", c->self);
+		chan_send_oclose(c);
+		c->ostate = CHAN_OUTPUT_WAIT_IEOF;
+		break;
+	case CHAN_OUTPUT_WAIT_DRAIN:
+		debug("channel %d: OUTPUT_WAIT_DRAIN -> OUTPUT_CLOSED [write failed]", c->self);
+		chan_send_oclose(c);
+		c->ostate = CHAN_OUTPUT_CLOSED;
+		chan_delete_if_full_closed(c);
+		break;
+	default:
+		error("internal error: chan_write_failed %d for ostate %d", c->self, c->ostate);
+		break;
+	}
+}
+void
+chan_obuf_empty(Channel *c)
+{
+	if (buffer_len(&c->output)) {
+		debug("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_WAIT_DRAIN -> OUTPUT_CLOSED [obuf empty, send OCLOSE]", c->self);
+		chan_send_oclose(c);
+		c->ostate = CHAN_OUTPUT_CLOSED;
+		chan_delete_if_full_closed(c);
+		break;
+	default:
+		error("internal error: chan_obuf_empty %d for ostate %d", c->self, c->ostate);
+		break;
+	}
+}
+
+/*
+ * ACTIONS: should never update the channel states: c->istate or c->ostate
+ */
+static void
+chan_send_ieof(Channel *c)
+{
+	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("internal error: channel %d: cannot send IEOF for istate %d", c->self, c->istate);
+		break;
+	}
+}
+static void
+chan_send_oclose(Channel *c)
+{
+	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("internal error: channel %d: cannot send OCLOSE for ostate %d", c->self, c->istate);
+		break;
+	}
+}
+
+/* helper */
+static void
+chan_shutdown_write(Channel *c)
+{
+	/* shutdown failure is allowed if write failed already */
+	debug("channel %d: shutdown_write", c->self);
+	if (shutdown(c->sock, SHUT_WR) < 0)
+		debug("chan_shutdown_write failed for #%d/fd%d: %.100s",
+		      c->self, c->sock, strerror(errno));
+}
+static void
+chan_shutdown_read(Channel *c)
+{
+	debug("channel %d: shutdown_read", c->self);
+	if (shutdown(c->sock, SHUT_RD) < 0)
+		error("chan_shutdown_read failed for #%d/fd%d [i%d o%d]: %.100s",
+		      c->self, c->sock, c->istate, c->ostate, strerror(errno));
+}
+static void
+chan_delete_if_full_closed(Channel *c)
+{
+	if (c->istate == CHAN_INPUT_CLOSED && c->ostate == CHAN_OUTPUT_CLOSED) {
+		debug("channel %d: full closed", c->self);
+		channel_free(c->self);
+	}
+}
+void
+chan_init_iostates(Channel *c)
+{
+	c->ostate = CHAN_OUTPUT_OPEN;
+	c->istate = CHAN_INPUT_OPEN;
+}