src/usr.bin/ssh/nchan.h - diff

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Diff for /src/usr.bin/ssh/Attic/nchan.h between version 1.2 and 1.3

-version 1.2, 1999/10/16 22:29:01
+version 1.3, 1999/10/17 16:56:09
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   * See the debugging output from 'ssh -v' and 'sshd -d' of
   * ssh-1.2.27 as an example.
   *
-  * Details: (for Channel data structure see channels.h)
-  *
-  * - the output_buffer gets data received from the remote peer and
-  *   is written to the socket,
-  * - the input_buffer gets data from the socket and is sent to remote peer.
-  * - the socket represents the local object communicating with an object
-  *   reachable via the peer
-  *
-  *      PEER A                                  PEER B
-  *
-  * read(sock, input_buffer) < 0;
-  * shutdown_read();
-  * flush(input_buffer) =: DATA
-  * send(DATA)                   ->      rcvd(DATA)
-  *                                      write(sock, output_buffer:=DATA);
-  * send(IEOF)                   ->      rcvd(IEOF)
-  *                                      shutdown_write() if:
-  *                                              a) write fails
-  *                                              b) rcvd_IEOF==true &&
-  *                                                 output_buffer==empty
-  * rcvd(OCLOSE)                 <-      send(OCLOSE)
-  *
-  * The channel is now half closed. No data will flow from A to B.
-  *
-  * Note that each side can remove the channel only if 2 messages
-  * have been sent and received and the associated socket has been
-  * shutdown, see below:
   */
- enum {
+ /* ssh-proto-1.5 overloads prot-1.3-message-types */
-         /* ssh-proto-1.5 overloads message-types */
+ #define SSH_MSG_CHANNEL_INPUT_EOF       SSH_MSG_CHANNEL_CLOSE
-         CHAN_IEOF   = SSH_MSG_CHANNEL_CLOSE,
+ #define SSH_MSG_CHANNEL_OUTPUT_CLOSE    SSH_MSG_CHANNEL_CLOSE_CONFIRMATION
-                         /* there will be no more data from sender */
-         CHAN_OCLOSE = SSH_MSG_CHANNEL_CLOSE_CONFIRMATION,
-                         /* all received data has been written to the socket */
-         /* channel close flags */
+ /* possible input states */
-         CHAN_IEOF_SENT          = 0x01,
+ #define CHAN_INPUT_OPEN                 0x01
-         CHAN_IEOF_RCVD          = 0x02,
+ #define CHAN_INPUT_WAIT_DRAIN           0x02
-         CHAN_OCLOSE_SENT        = 0x04,
+ #define CHAN_INPUT_WAIT_OCLOSE          0x04
-         CHAN_OCLOSE_RCVD        = 0x08,
+ #define CHAN_INPUT_CLOSED               0x08
-         CHAN_SHUT_RD            = 0x10,
-         CHAN_SHUT_WR            = 0x20,
-         /* a channel can be removed if ALL the following flags are set: */
+ /* possible output states */
-         CHAN_CLOSED             = CHAN_IEOF_SENT | CHAN_IEOF_RCVD |
+ #define CHAN_OUTPUT_OPEN                0x10
-                                   CHAN_OCLOSE_SENT | CHAN_OCLOSE_RCVD |
+ #define CHAN_OUTPUT_WAIT_DRAIN          0x20
-                                   CHAN_SHUT_RD | CHAN_SHUT_WR
+ #define CHAN_OUTPUT_WAIT_IEOF           0x40
- };
+ #define CHAN_OUTPUT_CLOSED              0x80
- void chan_del_if_dead(Channel *c);
+ /* EVENTS for the input state */
- void chan_rcvd_ieof(Channel *c);
  void chan_rcvd_oclose(Channel *c);
- void chan_send_ieof(Channel *c);
+ void chan_read_failed(Channel *c);
- void chan_send_oclose(Channel *c);
+ void chan_ibuf_empty(Channel *c);
- void chan_shutdown_read(Channel *c);
- void chan_shutdown_write(Channel *c);
+ /* EVENTS for the output state */
+ void chan_rcvd_ieof(Channel *c);
+ void chan_write_failed(Channel *c);
+ void chan_obuf_empty(Channel *c);
+ void chan_init_iostates(Channel *c);
  #endif