| /* |
| * 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 _CHANNEL_H_ |
| #define _CHANNEL_H_ |
| |
| #include "includes.h" |
| #include "buffer.h" |
| |
| /* channel->type values */ |
| #define CHANNEL_ID_NONE 0 |
| #define CHANNEL_ID_SESSION 1 |
| #define CHANNEL_ID_X11 2 |
| #define CHANNEL_ID_AGENT 3 |
| #define CHANNEL_ID_TCPDIRECT 4 |
| #define CHANNEL_ID_TCPFORWARDED 5 |
| |
| #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 MAX_CHANNELS 60 /* simple mem restriction, includes each tcp/x11 |
| connection, so can't be _too_ small */ |
| |
| #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */ |
| |
| #define RECV_MAXWINDOW 6000 /* tweak */ |
| #define RECV_MAXPACKET 1400 /* tweak */ |
| #define RECV_MINWINDOW 19000 /* when we get below this, we send a windowadjust */ |
| |
| struct ChanType; |
| |
| struct Channel { |
| |
| unsigned int index; /* the local channel index */ |
| unsigned int remotechan; |
| unsigned int recvwindow, transwindow; |
| unsigned int recvmaxpacket, transmaxpacket; |
| void* typedata; /* a pointer to type specific data */ |
| int infd; /* stdin for the program, we write to this */ |
| int outfd; /* stdout for the program, we read from this */ |
| int errfd; /* stdout for a program. This doesn't really fit here, |
| but makes the code a lot tidyer without being too bad. This |
| is -1 for channels which don't requre it. Currently only |
| a 'session' without a pty will use it */ |
| buffer *writebuf; /* data for the program */ |
| |
| int sentclosed, recvclosed; |
| |
| /* this is set when we receive/send a channel eof packet */ |
| int recveof, senteof; |
| |
| int initconn; /* used for TCP forwarding, whether the channel has been |
| fully initialised */ |
| |
| const struct ChanType* type; |
| |
| }; |
| |
| struct ChanType { |
| |
| int sepfds; /* Whether this channel has seperate pipes for in/out or not */ |
| char *name; |
| int (*inithandler)(struct Channel*); |
| int (*checkclose)(struct Channel*); |
| void (*reqhandler)(struct Channel*); |
| void (*closehandler)(struct Channel*); |
| |
| }; |
| |
| void chaninitialise(); |
| void chancleanup(); |
| void setchannelfds(fd_set *readfd, fd_set *writefd); |
| void channelio(fd_set *readfd, fd_set *writefd); |
| struct Channel* newchannel(unsigned int remotechan, |
| const struct ChanType *type, |
| unsigned int transwindow, unsigned int transmaxpacket); |
| |
| void recv_msg_channel_open(); |
| void recv_msg_channel_request(); |
| void send_msg_channel_failure(struct Channel *channel); |
| void send_msg_channel_success(struct Channel *channel); |
| void recv_msg_channel_data(); |
| void recv_msg_channel_window_adjust(); |
| void recv_msg_channel_close(); |
| void recv_msg_channel_eof(); |
| |
| #ifdef USING_LISTENERS |
| int send_msg_channel_open_init(int fd, const struct ChanType *type); |
| void recv_msg_channel_open_confirmation(); |
| void recv_msg_channel_open_failure(); |
| #endif |
| |
| #endif /* _CHANNEL_H_ */ |