Initial revision
diff --git a/nchan.c b/nchan.c
new file mode 100644
index 0000000..fcaeae4
--- /dev/null
+++ b/nchan.c
@@ -0,0 +1,187 @@
+#include "includes.h"
+RCSID("$Id: nchan.c,v 1.1 1999/10/27 03:42:44 damien 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_delele_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;
+ chan_delele_if_full_closed(c);
+ 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;
+ chan_delele_if_full_closed(c);
+ break;
+ default:
+ debug("protocol error: chan_rcvd_oclose %d for istate %d",c->self,c->istate);
+ break;
+ }
+}
+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:
+ debug("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)){
+ debug("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:
+ debug("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_delele_if_full_closed(c);
+ break;
+ default:
+ debug("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_delele_if_full_closed(c);
+ break;
+ default:
+ debug("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_delele_if_full_closed(c);
+ break;
+ default:
+ debug("internal error: chan_obuf_empty %d for ostate %d",c->self,c->ostate);
+ break;
+ }
+}
+/*
+ * ACTIONS: should never update 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:
+ debug("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:
+ debug("internal error: channel %d: cannot send OCLOSE for ostate %d",c->self,c->istate);
+ break;
+ }
+}
+/* helper */
+static void
+chan_shutdown_write(Channel *c){
+ debug("channel %d: shutdown_write", c->self);
+ if(shutdown(c->sock, SHUT_WR)<0)
+ error("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: %.100s",
+ c->self, c->sock, strerror(errno));
+}
+static void
+chan_delele_if_full_closed(Channel *c){
+ if(c->istate==CHAN_INPUT_CLOSED && c->ostate==CHAN_OUTPUT_CLOSED){
+ debug("channel %d: closing", c->self);
+ channel_free(c->self);
+ }
+}
+void
+chan_init_iostates(Channel *c){
+ c->ostate=CHAN_OUTPUT_OPEN;
+ c->istate=CHAN_INPUT_OPEN;
+}