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Diff for /src/usr.bin/ssh/channels.h between version 1.31 and 1.31.2.3

version 1.31, 2001/04/13 22:46:53 version 1.31.2.3, 2001/11/15 00:15:19
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  * called by a name other than "ssh" or "Secure Shell".   * called by a name other than "ssh" or "Secure Shell".
  */   */
 /*  /*
  * Copyright (c) 2000 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   * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions   * modification, are permitted provided that the following conditions
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  */   */
 /* RCSID("$OpenBSD$"); */  /* RCSID("$OpenBSD$"); */
   
 #ifndef CHANNELS_H  #ifndef CHANNEL_H
 #define CHANNELS_H  #define CHANNEL_H
   
 #include "buffer.h"  #include "buffer.h"
   
 /* Definitions for channel types. */  /* Definitions for channel types. */
 #define SSH_CHANNEL_FREE                0       /* This channel is free (unused). */  
 #define SSH_CHANNEL_X11_LISTENER        1       /* Listening for inet X11 conn. */  #define SSH_CHANNEL_X11_LISTENER        1       /* Listening for inet X11 conn. */
 #define SSH_CHANNEL_PORT_LISTENER       2       /* Listening on a port. */  #define SSH_CHANNEL_PORT_LISTENER       2       /* Listening on a port. */
 #define SSH_CHANNEL_OPENING             3       /* waiting for confirmation */  #define SSH_CHANNEL_OPENING             3       /* waiting for confirmation */
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 #define SSH_CHANNEL_RPORT_LISTENER      11      /* Listening to a R-style port  */  #define SSH_CHANNEL_RPORT_LISTENER      11      /* Listening to a R-style port  */
 #define SSH_CHANNEL_CONNECTING          12  #define SSH_CHANNEL_CONNECTING          12
 #define SSH_CHANNEL_DYNAMIC             13  #define SSH_CHANNEL_DYNAMIC             13
 #define SSH_CHANNEL_MAX_TYPE            14  #define SSH_CHANNEL_ZOMBIE              14      /* Almost dead. */
   #define SSH_CHANNEL_MAX_TYPE            15
   
 /*  #define SSH_CHANNEL_PATH_LEN            30
  * Data structure for channel data.  This is iniailized in channel_allocate  
  * and cleared in channel_free.  
  */  
 struct Channel;  struct Channel;
 typedef struct Channel Channel;  typedef struct Channel Channel;
   
 typedef void channel_callback_fn(int id, void *arg);  typedef void channel_callback_fn(int, void *);
 typedef int channel_filter_fn(struct Channel *c, char *buf, int len);  typedef int channel_filter_fn(struct Channel *, char *, int);
   
 struct Channel {  struct Channel {
         int     type;           /* channel type/state */          int     type;           /* channel type/state */
         int     self;           /* my own channel identifier */          int     self;           /* my own channel identifier */
         int     remote_id;      /* channel identifier for remote peer */          int     remote_id;      /* channel identifier for remote peer */
         /* peer can be reached over encrypted connection, via packet-sent */  
         int     istate;         /* input from channel (state of receive half) */          int     istate;         /* input from channel (state of receive half) */
         int     ostate;         /* output to channel  (state of transmit half) */          int     ostate;         /* output to channel  (state of transmit half) */
         int     flags;          /* close sent/rcvd */          int     flags;          /* close sent/rcvd */
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         int     efd;            /* extended fd */          int     efd;            /* extended fd */
         int     sock;           /* sock fd */          int     sock;           /* sock fd */
         int     isatty;         /* rfd is a tty */          int     isatty;         /* rfd is a tty */
           int     force_drain;    /* force close on iEOF */
           int     delayed;                /* fdset hack */
         Buffer  input;          /* data read from socket, to be sent over          Buffer  input;          /* data read from socket, to be sent over
                                  * encrypted connection */                                   * encrypted connection */
         Buffer  output;         /* data received over encrypted connection for          Buffer  output;         /* data received over encrypted connection for
                                  * send on socket */                                   * send on socket */
         Buffer  extended;          Buffer  extended;
         char    path[200];      /* path for unix domain sockets, or host name          char    path[SSH_CHANNEL_PATH_LEN];
                                  * for forwards */                  /* path for unix domain sockets, or host name for forwards */
         int     listening_port; /* port being listened for forwards */          int     listening_port; /* port being listened for forwards */
         int     host_port;      /* remote port to connect for forwards */          int     host_port;      /* remote port to connect for forwards */
         char   *remote_name;    /* remote hostname */          char   *remote_name;    /* remote hostname */
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         channel_callback_fn     *cb_fn;          channel_callback_fn     *cb_fn;
         void    *cb_arg;          void    *cb_arg;
         int     cb_event;          int     cb_event;
         channel_callback_fn     *dettach_user;          channel_callback_fn     *detach_user;
   
         /* filter */          /* filter */
         channel_filter_fn       *input_filter;          channel_filter_fn       *input_filter;
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 #define CHAN_X11_WINDOW_DEFAULT (4*1024)  #define CHAN_X11_WINDOW_DEFAULT (4*1024)
 #define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2)  #define CHAN_X11_PACKET_DEFAULT (CHAN_X11_WINDOW_DEFAULT/2)
   
   /* possible input states */
   #define CHAN_INPUT_OPEN                 0x01
   #define CHAN_INPUT_WAIT_DRAIN           0x02
   #define CHAN_INPUT_WAIT_OCLOSE          0x04
   #define CHAN_INPUT_CLOSED               0x08
   
 void    channel_open(int id);  /* possible output states */
 void    channel_request(int id, char *service, int wantconfirm);  #define CHAN_OUTPUT_OPEN                0x10
 void    channel_request_start(int id, char *service, int wantconfirm);  #define CHAN_OUTPUT_WAIT_DRAIN          0x20
 void    channel_register_callback(int id, int mtype, channel_callback_fn *fn, void *arg);  #define CHAN_OUTPUT_WAIT_IEOF           0x40
 void    channel_register_cleanup(int id, channel_callback_fn *fn);  #define CHAN_OUTPUT_CLOSED              0x80
 void    channel_register_filter(int id, channel_filter_fn *fn);  
 void    channel_cancel_cleanup(int id);  
 Channel *channel_lookup(int id);  
   
 int  #define CHAN_CLOSE_SENT                 0x01
 channel_new(char *ctype, int type, int rfd, int wfd, int efd,  #define CHAN_CLOSE_RCVD                 0x02
     int window, int maxpack, int extended_usage, char *remote_name,  
     int nonblock);  
 void  
 channel_set_fds(int id, int rfd, int wfd, int efd,  
     int extusage, int nonblock);  
   
 void    deny_input_open(int type, int plen, void *ctxt);  /* channel management */
   
 void    channel_input_channel_request(int type, int plen, void *ctxt);  Channel *channel_lookup(int);
 void    channel_input_close(int type, int plen, void *ctxt);  Channel *channel_new(char *, int, int, int, int, int, int, int, char *, int);
 void    channel_input_close_confirmation(int type, int plen, void *ctxt);  void     channel_set_fds(int, int, int, int, int, int);
 void    channel_input_data(int type, int plen, void *ctxt);  void     channel_free(Channel *);
 void    channel_input_extended_data(int type, int plen, void *ctxt);  void     channel_free_all(void);
 void    channel_input_ieof(int type, int plen, void *ctxt);  void     channel_stop_listening(void);
 void    channel_input_oclose(int type, int plen, void *ctxt);  
 void    channel_input_open_confirmation(int type, int plen, void *ctxt);  
 void    channel_input_open_failure(int type, int plen, void *ctxt);  
 void    channel_input_port_open(int type, int plen, void *ctxt);  
 void    channel_input_window_adjust(int type, int plen, void *ctxt);  
   
 /* Sets specific protocol options. */  void     channel_send_open(int);
 void    channel_set_options(int hostname_in_open);  void     channel_request(int, char *, int);
   void     channel_request_start(int, char *, int);
   void     channel_register_callback(int, int mtype, channel_callback_fn *, void *);
   void     channel_register_cleanup(int, channel_callback_fn *);
   void     channel_register_filter(int, channel_filter_fn *);
   void     channel_cancel_cleanup(int);
   int      channel_close_fd(int *);
   
 /*  /* protocol handler */
  * Allocate a new channel object and set its type and socket.  Remote_name  
  * must have been allocated with xmalloc; this will free it when the channel  
  * is freed.  
  */  
 int     channel_allocate(int type, int sock, char *remote_name);  
   
 /* Free the channel and close its socket. */  void     channel_input_channel_request(int, int, void *);
 void    channel_free(int channel);  void     channel_input_close(int, int, void *);
   void     channel_input_close_confirmation(int, int, void *);
   void     channel_input_data(int, int, void *);
   void     channel_input_extended_data(int, int, void *);
   void     channel_input_ieof(int, int, void *);
   void     channel_input_oclose(int, int, void *);
   void     channel_input_open_confirmation(int, int, void *);
   void     channel_input_open_failure(int, int, void *);
   void     channel_input_port_open(int, int, void *);
   void     channel_input_window_adjust(int, int, void *);
   
 /*  /* file descriptor handling (read/write) */
  * Allocate/update select bitmasks and add any bits relevant to channels in  
  * select bitmasks.  
  */  
 void  
 channel_prepare_select(fd_set **readsetp, fd_set **writesetp, int *maxfdp,  
     int rekeying);  
   
 /*  void     channel_prepare_select(fd_set **, fd_set **, int *, int*, int);
  * After select, perform any appropriate operations for channels which have  void     channel_after_select(fd_set *, fd_set *);
  * events pending.  void     channel_output_poll(void);
  */  
 void    channel_after_select(fd_set * readset, fd_set * writeset);  
   
 /* If there is data to send to the connection, send some of it now. */  int      channel_not_very_much_buffered_data(void);
 void    channel_output_poll(void);  void     channel_close_all(void);
   int      channel_still_open(void);
   char    *channel_open_message(void);
   int      channel_find_open(void);
   
 /* Returns true if no channel has too much buffered data. */  /* tcp forwarding */
 int     channel_not_very_much_buffered_data(void);  void     channel_set_af(int af);
   void     channel_permit_all_opens(void);
 /* This closes any sockets that are listening for connections; this removes  void     channel_add_permitted_opens(char *, int);
    any unix domain sockets. */  void     channel_clear_permitted_opens(void);
 void    channel_stop_listening(void);  void     channel_input_port_forward_request(int, int);
   int      channel_connect_to(const char *, u_short);
 /*  int      channel_connect_by_listen_address(u_short);
  * Closes the sockets of all channels.  This is used to close extra file  void     channel_request_remote_forwarding(u_short, const char *, u_short);
  * descriptors after a fork.  int      channel_request_local_forwarding(u_short, const char *, u_short, int);
  */  
 void    channel_close_all(void);  
   
 /* Returns true if there is still an open channel over the connection. */  
 int     channel_still_open(void);  
   
 /*  
  * Returns a string containing a list of all open channels.  The list is  
  * suitable for displaying to the user.  It uses crlf instead of newlines.  
  * The caller should free the string with xfree.  
  */  
 char   *channel_open_message(void);  
   
 /*  
  * Initiate forwarding of connections to local port "port" through the secure  
  * channel to host:port from remote side.  
  */  
 int  int
 channel_request_local_forwarding(u_short listen_port,  channel_request_forwarding(const char *, u_short, const char *, u_short, int,
     const char *host_to_connect, u_short port_to_connect, int gateway_ports);      int);
 int  
 channel_request_forwarding(const char *listen_address, u_short listen_port,  
     const char *host_to_connect, u_short port_to_connect, int gateway_ports,  
     int remote_fwd);  
   
 /*  /* x11 forwarding */
  * Initiate forwarding of connections to port "port" on remote host through  
  * the secure channel to host:port from local side.  This never returns if  
  * there was an error.  This registers that open requests for that port are  
  * permitted.  
  */  
 void  
 channel_request_remote_forwarding(u_short port, const char *host,  
     u_short remote_port);  
   
 /*  int      x11_connect_display(void);
  * Permits opening to any host/port if permitted_opens[] is empty.  This is  char    *x11_create_display(int);
  * usually called by the server, because the user could connect to any port  char    *x11_create_display_inet(int, int);
  * anyway, and the server has no way to know but to trust the client anyway.  void     x11_input_open(int, int, void *);
  */  void     x11_request_forwarding(void);
 void    channel_permit_all_opens(void);  void     x11_request_forwarding_with_spoofing(int, const char *, const char *);
   void     deny_input_open(int, int, void *);
   
 /* Add host/port to list of allowed targets for port forwarding */  /* agent forwarding */
 void    channel_add_permitted_opens(char *host, int port);  
   
 /* Flush list */  void     auth_request_forwarding(void);
 void    channel_clear_permitted_opens(void);  char    *auth_get_socket_name(void);
   void     auth_sock_cleanup_proc(void *);
   int      auth_input_request_forwarding(struct passwd *);
   void     auth_input_open_request(int, int, void *);
   
 /*  /* channel close */
  * This is called after receiving CHANNEL_FORWARDING_REQUEST.  This initates  
  * listening for the port, and sends back a success reply (or disconnect  
  * message if there was an error).  This never returns if there was an error.  
  */  
 void    channel_input_port_forward_request(int is_root, int gateway_ports);  
   
 /*  int      chan_is_dead(Channel *, int);
  * Creates a port for X11 connections, and starts listening for it. Returns  void     chan_mark_dead(Channel *);
  * the display name, or NULL if an error was encountered.  void     chan_init_iostates(Channel *);
  */  void     chan_init(void);
 char   *x11_create_display(int screen);  
   
 /*  typedef void    chan_event_fn(Channel *);
  * Creates an internet domain socket for listening for X11 connections.  
  * Returns a suitable value for the DISPLAY variable, or NULL if an error  
  * occurs.  
  */  
 char   *x11_create_display_inet(int screen, int x11_display_offset);  
   
 /*  /* for the input state */
  * This is called when SSH_SMSG_X11_OPEN is received.  The packet contains  extern chan_event_fn    *chan_rcvd_oclose;
  * the remote channel number.  We should do whatever we want, and respond  extern chan_event_fn    *chan_read_failed;
  * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE.  extern chan_event_fn    *chan_ibuf_empty;
  */  
 void    x11_input_open(int type, int plen, void *ctxt);  
   
 /*  /* for the output state */
  * Requests forwarding of X11 connections.  This should be called on the  extern chan_event_fn    *chan_rcvd_ieof;
  * client only.  extern chan_event_fn    *chan_write_failed;
  */  extern chan_event_fn    *chan_obuf_empty;
 void    x11_request_forwarding(void);  
   
 /*  
  * Requests forwarding for X11 connections, with authentication spoofing.  
  * This should be called in the client only.  
  */  
 void  
 x11_request_forwarding_with_spoofing(int client_session_id,  
     const char *proto, const char *data);  
   
 /* Sends a message to the server to request authentication fd forwarding. */  
 void    auth_request_forwarding(void);  
   
 /*  
  * Returns the name of the forwarded authentication socket.  Returns NULL if  
  * there is no forwarded authentication socket.  The returned value points to  
  * a static buffer.  
  */  
 char   *auth_get_socket_name(void);  
   
 /*  
  * This is called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server.  
  * This starts forwarding authentication requests.  
  */  
 int     auth_input_request_forwarding(struct passwd * pw);  
   
 /* This is called to process an SSH_SMSG_AGENT_OPEN message. */  
 void    auth_input_open_request(int type, int plen, void *ctxt);  
   
 /* XXX */  
 int     channel_connect_to(const char *host, u_short host_port);  
 int     channel_connect_by_listen_adress(u_short listen_port);  
 int     x11_connect_display(void);  
   
 int     channel_find_open(void);  
   
 #endif  #endif
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  Added in v.1.31.2.3