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- /*
- * Dropbear - a SSH2 server
- *
- * Copyright (c) 2002,2003 Matt Johnston
- * All rights reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE. */
- #ifndef DROPBEAR_CHANNEL_H_
- #define DROPBEAR_CHANNEL_H_
- #include "includes.h"
- #include "buffer.h"
- #include "circbuffer.h"
- #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1
- #define SSH_OPEN_CONNECT_FAILED 2
- #define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3
- #define SSH_OPEN_RESOURCE_SHORTAGE 4
- /* Not a real type */
- #define SSH_OPEN_IN_PROGRESS 99
- #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */
- struct ChanType;
- enum dropbear_channel_prio {
- DROPBEAR_CHANNEL_PRIO_INTERACTIVE, /* pty shell, x11 */
- DROPBEAR_CHANNEL_PRIO_UNKNOWABLE, /* tcp - can't know what's being forwarded */
- DROPBEAR_CHANNEL_PRIO_BULK, /* the rest - probably scp or something */
- DROPBEAR_CHANNEL_PRIO_EARLY, /* channel is still being set up */
- };
- struct Channel {
- unsigned int index; /* the local channel index */
- unsigned int remotechan;
- unsigned int recvwindow, transwindow;
- unsigned int recvdonelen;
- unsigned int recvmaxpacket, transmaxpacket;
- void* typedata; /* a pointer to type specific data */
- int writefd; /* read from wire, written to insecure side */
- int readfd; /* read from insecure side, written to wire */
- int errfd; /* used like writefd or readfd, depending if it's client or server.
- Doesn't exactly belong here, but is cleaner here */
- circbuffer *writebuf; /* data from the wire, for local consumption. Can be
- initially NULL */
- circbuffer *extrabuf; /* extended-data for the program - used like writebuf
- but for stderr */
- /* whether close/eof messages have been exchanged */
- int sent_close, recv_close;
- int recv_eof, sent_eof;
- /* Set after running the ChanType-specific close hander
- * to ensure we don't run it twice (nor type->checkclose()). */
- int close_handler_done;
- struct dropbear_progress_connection *conn_pending;
- int initconn; /* used for TCP forwarding, whether the channel has been
- fully initialised */
- int await_open; /* flag indicating whether we've sent an open request
- for this channel (and are awaiting a confirmation
- or failure). */
- int flushing;
- /* Used by client chansession to handle ~ escaping, NULL ignored otherwise */
- void (*read_mangler)(struct Channel*, unsigned char* bytes, int *len);
- const struct ChanType* type;
- enum dropbear_channel_prio prio;
- };
- struct ChanType {
- int sepfds; /* Whether this channel has separate pipes for in/out or not */
- char *name;
- int (*inithandler)(struct Channel*);
- int (*check_close)(struct Channel*);
- void (*reqhandler)(struct Channel*);
- void (*closehandler)(struct Channel*);
- };
- /* Callback for connect_remote */
- void channel_connect_done(int result, int sock, void* user_data, const char* errstring);
- void chaninitialise(const struct ChanType *chantypes[]);
- void chancleanup(void);
- void setchannelfds(fd_set *readfds, fd_set *writefds, int allow_reads);
- void channelio(fd_set *readfd, fd_set *writefd);
- struct Channel* getchannel(void);
- /* Returns an arbitrary channel that is in a ready state - not
- being initialised and no EOF in either direction. NULL if none. */
- struct Channel* get_any_ready_channel(void);
- void recv_msg_channel_open(void);
- void recv_msg_channel_request(void);
- void send_msg_channel_failure(struct Channel *channel);
- void send_msg_channel_success(struct Channel *channel);
- void recv_msg_channel_data(void);
- void recv_msg_channel_extended_data(void);
- void recv_msg_channel_window_adjust(void);
- void recv_msg_channel_close(void);
- void recv_msg_channel_eof(void);
- void common_recv_msg_channel_data(struct Channel *channel, int fd,
- circbuffer * buf);
- #ifdef DROPBEAR_CLIENT
- extern const struct ChanType clichansess;
- #endif
- #if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT)
- int send_msg_channel_open_init(int fd, const struct ChanType *type);
- void recv_msg_channel_open_confirmation(void);
- void recv_msg_channel_open_failure(void);
- #endif
- void start_send_channel_request(struct Channel *channel, char *type);
- void send_msg_request_success(void);
- void send_msg_request_failure(void);
- #endif /* DROPBEAR_CHANNEL_H_ */
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