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annotate channel.h @ 27:08da099e8337

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- Rename common-packet.c to packet.c - buf_burn the unencrypted read/write payload buffers after use to avoid sensitive contents sitting in memory for too long
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Jul 2004 02:14:42 +0000
parents db2c8e6fb284
children b0316ce64e4b
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #ifndef _CHANNEL_H_
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26 #define _CHANNEL_H_
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27
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28 #include "includes.h"
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29 #include "buffer.h"
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30
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31 /* channel->type values */
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32 #define CHANNEL_ID_NONE 0
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33 #define CHANNEL_ID_SESSION 1
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34 #define CHANNEL_ID_X11 2
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35 #define CHANNEL_ID_AGENT 3
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36 #define CHANNEL_ID_TCPDIRECT 4
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37 #define CHANNEL_ID_TCPFORWARDED 5
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38
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39 #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1
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40 #define SSH_OPEN_CONNECT_FAILED 2
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41 #define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3
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42 #define SSH_OPEN_RESOURCE_SHORTAGE 4
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43
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44 #define MAX_CHANNELS 60 /* simple mem restriction, includes each tcp/x11
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45 connection, so can't be _too_ small */
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47 #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */
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48
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49 #define RECV_MAXWINDOW 6000 /* tweak */
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50 #define RECV_MAXPACKET 1400 /* tweak */
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51 #define RECV_MINWINDOW 19000 /* when we get below this, we send a windowadjust */
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52
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53 struct ChanType;
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54
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55 struct Channel {
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57 unsigned int index; /* the local channel index */
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58 unsigned int remotechan;
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59 unsigned int recvwindow, transwindow;
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60 unsigned int recvmaxpacket, transmaxpacket;
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61 void* typedata; /* a pointer to type specific data */
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62 int infd; /* stdin for the program, we write to this */
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63 int outfd; /* stdout for the program, we read from this */
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64 int errfd; /* stdout for a program. This doesn't really fit here,
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65 but makes the code a lot tidyer without being too bad. This
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66 is -1 for channels which don't requre it. Currently only
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67 a 'session' without a pty will use it */
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68 buffer *writebuf; /* data for the program */
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69
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70 int sentclosed, recvclosed;
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71
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72 /* this is set when we receive/send a channel eof packet */
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73 int recveof, senteof;
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75 int initconn; /* used for TCP forwarding, whether the channel has been
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76 fully initialised */
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77
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78 const struct ChanType* type;
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80 };
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81
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82 struct ChanType {
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83
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84 int sepfds; /* Whether this channel has seperate pipes for in/out or not */
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85 char *name;
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86 int (*inithandler)(struct Channel*);
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87 int (*checkclose)(struct Channel*);
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88 void (*reqhandler)(struct Channel*);
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89 void (*closehandler)(struct Channel*);
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90
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91 };
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92
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93 void chaninitialise();
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94 void chancleanup();
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95 void setchannelfds(fd_set *readfd, fd_set *writefd);
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96 void channelio(fd_set *readfd, fd_set *writefd);
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97 struct Channel* newchannel(unsigned int remotechan,
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98 const struct ChanType *type,
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99 unsigned int transwindow, unsigned int transmaxpacket);
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100
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101 void recv_msg_channel_open();
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102 void recv_msg_channel_request();
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103 void send_msg_channel_failure(struct Channel *channel);
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104 void send_msg_channel_success(struct Channel *channel);
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105 void recv_msg_channel_data();
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106 void recv_msg_channel_window_adjust();
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107 void recv_msg_channel_close();
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108 void recv_msg_channel_eof();
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109
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110 #ifdef USING_LISTENERS
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111 int send_msg_channel_open_init(int fd, const struct ChanType *type);
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112 void recv_msg_channel_open_confirmation();
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113 void recv_msg_channel_open_failure();
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114 #endif
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115
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116 #endif /* _CHANNEL_H_ */