Mercurial > dropbear
annotate channel.h @ 400:a5bca950120d channel-fix
merge of '1dfbc5ef92391d01b576c8506061927869a89887'
and '275426b7a4b94a0507c78327f86bcd2cd0b0f985'
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 03 Feb 2007 08:20:45 +0000 |
parents | 78518751cb82 |
children | a01c0c8e543a |
rev | line source |
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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" |
107 | 30 #include "circbuffer.h" |
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31 |
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32 /* channel->type values */ |
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33 #define CHANNEL_ID_NONE 0 |
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34 #define CHANNEL_ID_SESSION 1 |
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35 #define CHANNEL_ID_X11 2 |
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36 #define CHANNEL_ID_AGENT 3 |
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37 #define CHANNEL_ID_TCPDIRECT 4 |
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38 #define CHANNEL_ID_TCPFORWARDED 5 |
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39 |
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40 #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1 |
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41 #define SSH_OPEN_CONNECT_FAILED 2 |
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42 #define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3 |
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43 #define SSH_OPEN_RESOURCE_SHORTAGE 4 |
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44 |
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45 /* Not a real type */ |
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46 #define SSH_OPEN_IN_PROGRESS 99 |
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47 |
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48 #define MAX_CHANNELS 100 /* simple mem restriction, includes each tcp/x11 |
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49 connection, so can't be _too_ small */ |
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50 |
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51 #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */ |
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52 |
124 | 53 #define RECV_MAXWINDOW 8000 /* tweak */ |
54 #define RECV_WINDOWEXTEND 1000 /* We send a "window extend" every | |
108
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55 RECV_WINDOWEXTEND bytes */ |
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56 #define RECV_MAXPACKET RECV_MAXWINDOW /* tweak */ |
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57 |
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58 struct ChanType; |
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59 |
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60 struct Channel { |
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61 |
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62 unsigned int index; /* the local channel index */ |
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63 unsigned int remotechan; |
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64 unsigned int recvwindow, transwindow; |
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65 unsigned int recvdonelen; |
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66 unsigned int recvmaxpacket, transmaxpacket; |
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67 void* typedata; /* a pointer to type specific data */ |
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68 int writefd; /* read from wire, written to insecure side */ |
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69 int readfd; /* read from insecure size, written to wire */ |
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70 int errfd; /* used like writefd or readfd, depending if it's client or server. |
107 | 71 Doesn't exactly belong here, but is cleaner here */ |
72 circbuffer *writebuf; /* data from the wire, for local consumption */ | |
73 circbuffer *extrabuf; /* extended-data for the program - used like writebuf | |
74 but for stderr */ | |
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75 |
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76 /* whether close/eof messages have been exchanged */ |
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77 int sent_close, recv_close; |
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78 int recv_eof, sent_eof; |
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79 |
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80 int initconn; /* used for TCP forwarding, whether the channel has been |
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81 fully initialised */ |
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82 |
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83 int await_open; /* flag indicating whether we've sent an open request |
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84 for this channel (and are awaiting a confirmation |
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85 or failure). */ |
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86 |
7 | 87 const struct ChanType* type; |
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88 |
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89 }; |
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90 |
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91 struct ChanType { |
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92 |
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93 int sepfds; /* Whether this channel has seperate pipes for in/out or not */ |
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94 char *name; |
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95 int (*inithandler)(struct Channel*); |
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96 int (*check_close)(struct Channel*); |
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97 void (*reqhandler)(struct Channel*); |
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98 void (*closehandler)(struct Channel*); |
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99 |
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100 }; |
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101 |
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102 void chaninitialise(const struct ChanType *chantypes[]); |
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103 void chancleanup(); |
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104 void setchannelfds(fd_set *readfd, fd_set *writefd); |
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105 void channelio(fd_set *readfd, fd_set *writefd); |
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106 struct Channel* getchannel(); |
7 | 107 struct Channel* newchannel(unsigned int remotechan, |
108 const struct ChanType *type, | |
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109 unsigned int transwindow, unsigned int transmaxpacket); |
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110 |
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111 void recv_msg_channel_open(); |
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112 void recv_msg_channel_request(); |
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113 void send_msg_channel_failure(struct Channel *channel); |
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114 void send_msg_channel_success(struct Channel *channel); |
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115 void recv_msg_channel_data(); |
107 | 116 void recv_msg_channel_extended_data(); |
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117 void recv_msg_channel_window_adjust(); |
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118 void recv_msg_channel_close(); |
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119 void recv_msg_channel_eof(); |
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120 |
107 | 121 void common_recv_msg_channel_data(struct Channel *channel, int fd, |
122 circbuffer * buf); | |
123 | |
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124 #ifdef DROPBEAR_CLIENT |
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125 extern const struct ChanType clichansess; |
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126 #endif |
107 | 127 |
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128 #if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT) |
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129 int send_msg_channel_open_init(int fd, const struct ChanType *type); |
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130 void recv_msg_channel_open_confirmation(); |
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131 void recv_msg_channel_open_failure(); |
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132 #endif |
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133 |
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134 #endif /* _CHANNEL_H_ */ |