************************************************************
** Notes on the current version of the SCP protocol used  **
** to communicate with sesman                             **
**                                                        **
** This information is for internal documentational use   **
** only. It may be incomplete. The SCP protocol is        **
** internal, and may change for even minor releases.      **
************************************************************


message header
version     4       - version, 0 or 1
size        4       - size of PDU including header
cmdset      2       - 0

version 0
cmdset 2 bytes
    0   - Xvnc                              client to server
    3   - response to 0, 10, or 20          server to client
    4   - SCP_GW_AUTHENTICATION             client to server
    10  - X11rdp                            client to server
    20  - Xorg                              client to server

version 1
cmdset 2 bytes
    0   - SCP_COMMAND_SET_DEFAULT
    1   - SCP_COMMAND_SET_MANAGE
    2   - SCP_COMMAND_SET_RSR

SCP_COMMAND_SET_DEFAULT
cmd 2 bytes
    1       - main                          client to server
    3       - password request              server to client
    4       - password reply                client to server
    30      - connect new session
    40      - list all sessions             server to client
    41      - list all sessions response    client to server
    42      - list all sessions             server to client
    43      - list all sessions response    client to server
    44      - list all sessions response    client to server
    45      -                               client to server
    46      - reconnect session
    0xFFFF  - SCP_CMD_CONN_ERROR

SCP_COMMAND_SET_MANAGE
cmd 2 bytes
    1       - manager login
    2       - SCP_CMD_MNG_LOGIN_ALLOW

v0
scp_process                         scp.c
    scp_vXs_accept                  libscp_vX.c
        scp_v0s_accept              libscp_v0.c
    scp_v0_process                  scp_v0.c
        session_start               session.c

v1
scp_process                         scp.c
    scp_vXs_accept                  libscp_vX.c
        scp_v1s_accept              libscp_v1s.c
            scp_v1s_mng_accept      libscp_v1s_mng.c
    scp_v1_process                  scp_v1.c
        scp_v1s_request_password    libscp_v1s.c
    or
    scp_v1_mng_process              scp_v1_mng.c