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