1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Dropbear - a SSH2 server 3f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 4f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Copyright (c) 2002,2003 Matt Johnston 5f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * All rights reserved. 6f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 7f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Permission is hereby granted, free of charge, to any person obtaining a copy 8f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * of this software and associated documentation files (the "Software"), to deal 9f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * in the Software without restriction, including without limitation the rights 10f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * copies of the Software, and to permit persons to whom the Software is 12f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * furnished to do so, subject to the following conditions: 13f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 14f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The above copyright notice and this permission notice shall be included in 15f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * all copies or substantial portions of the Software. 16f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 17f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * SOFTWARE. */ 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifndef _CHANNEL_H_ 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define _CHANNEL_H_ 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include "includes.h" 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include "buffer.h" 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include "circbuffer.h" 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* channel->type values */ 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define CHANNEL_ID_NONE 0 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define CHANNEL_ID_SESSION 1 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define CHANNEL_ID_X11 2 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define CHANNEL_ID_AGENT 3 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define CHANNEL_ID_TCPDIRECT 4 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define CHANNEL_ID_TCPFORWARDED 5 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define SSH_OPEN_CONNECT_FAILED 2 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define SSH_OPEN_RESOURCE_SHORTAGE 4 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* Not a real type */ 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define SSH_OPEN_IN_PROGRESS 99 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define MAX_CHANNELS 100 /* simple mem restriction, includes each tcp/x11 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project connection, so can't be _too_ small */ 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */ 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define RECV_MAXWINDOW 8000 /* tweak */ 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define RECV_WINDOWEXTEND 1000 /* We send a "window extend" every 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project RECV_WINDOWEXTEND bytes */ 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#define RECV_MAXPACKET RECV_MAXWINDOW /* tweak */ 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectstruct ChanType; 59f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 60f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectstruct Channel { 61f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 62f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned int index; /* the local channel index */ 63f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned int remotechan; 64f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned int recvwindow, transwindow; 65f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned int recvdonelen; 66f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned int recvmaxpacket, transmaxpacket; 67f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project void* typedata; /* a pointer to type specific data */ 68f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int writefd; /* read from wire, written to insecure side */ 69f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int readfd; /* read from insecure size, written to wire */ 70f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int errfd; /* used like writefd or readfd, depending if it's client or server. 71f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project Doesn't exactly belong here, but is cleaner here */ 72f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project circbuffer *writebuf; /* data from the wire, for local consumption */ 73f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project circbuffer *extrabuf; /* extended-data for the program - used like writebuf 74f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project but for stderr */ 75f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 76f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* whether close/eof messages have been exchanged */ 77f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int sent_close, recv_close; 78f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int recv_eof, sent_eof; 79f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 80f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int initconn; /* used for TCP forwarding, whether the channel has been 81f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project fully initialised */ 82f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 83f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int await_open; /* flag indicating whether we've sent an open request 84f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project for this channel (and are awaiting a confirmation 85f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project or failure). */ 86f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 87f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int flushing; 88f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 89f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project const struct ChanType* type; 90f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 91f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project}; 92f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 93f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectstruct ChanType { 94f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 95f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int sepfds; /* Whether this channel has seperate pipes for in/out or not */ 96f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project char *name; 97f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int (*inithandler)(struct Channel*); 98f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int (*check_close)(struct Channel*); 99f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project void (*reqhandler)(struct Channel*); 100f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project void (*closehandler)(struct Channel*); 101f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 102f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project}; 103f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 104f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid chaninitialise(const struct ChanType *chantypes[]); 105f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid chancleanup(); 106f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid setchannelfds(fd_set *readfd, fd_set *writefd); 107f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid channelio(fd_set *readfd, fd_set *writefd); 108f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectstruct Channel* getchannel(); 109f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectstruct Channel* newchannel(unsigned int remotechan, 110f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project const struct ChanType *type, 111f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project unsigned int transwindow, unsigned int transmaxpacket); 112f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 113f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_open(); 114f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_request(); 115f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid send_msg_channel_failure(struct Channel *channel); 116f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid send_msg_channel_success(struct Channel *channel); 117f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_data(); 118f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_extended_data(); 119f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_window_adjust(); 120f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_close(); 121f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_eof(); 122f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 123f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid common_recv_msg_channel_data(struct Channel *channel, int fd, 124f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project circbuffer * buf); 125f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 126f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef DROPBEAR_CLIENT 127f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectextern const struct ChanType clichansess; 128f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 129f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 130f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT) 131f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint send_msg_channel_open_init(int fd, const struct ChanType *type); 132f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_open_confirmation(); 133f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectvoid recv_msg_channel_open_failure(); 134f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 135f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 136f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif /* _CHANNEL_H_ */ 137