Mercurial > dropbear

annotate channel.h @ 1060:4c733310c21d nocircbuffer

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reword comment for clarity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 23:26:42 +0800
parents 01eea88963f3
children 10f198d4a308
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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 DROPBEAR_CHANNEL_H_
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26 #define DROPBEAR_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 #include "circbuffer.h"
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31
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32 #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED 1
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33 #define SSH_OPEN_CONNECT_FAILED 2
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34 #define SSH_OPEN_UNKNOWN_CHANNEL_TYPE 3
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35 #define SSH_OPEN_RESOURCE_SHORTAGE 4
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36
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37 /* Not a real type */
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38 #define SSH_OPEN_IN_PROGRESS 99
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39
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40 #define CHAN_EXTEND_SIZE 3 /* how many extra slots to add when we need more */
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41
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42 struct ChanType;
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43
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44 enum dropbear_channel_prio {
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45 DROPBEAR_CHANNEL_PRIO_INTERACTIVE, /* pty shell, x11 */
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46 DROPBEAR_CHANNEL_PRIO_UNKNOWABLE, /* tcp - can't know what's being forwarded */
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47 DROPBEAR_CHANNEL_PRIO_BULK, /* the rest - probably scp or something */
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48 DROPBEAR_CHANNEL_PRIO_EARLY, /* channel is still being set up */
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49 };
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50
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51 struct Channel {
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52
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53 unsigned int index; /* the local channel index */
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54 unsigned int remotechan;
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55 unsigned int recvwindow, transwindow;
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56 unsigned int recvdonelen;
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57 unsigned int recvmaxpacket, transmaxpacket;
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58 void* typedata; /* a pointer to type specific data */
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59 int writefd; /* read from wire, written to insecure side */
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60 int readfd; /* read from insecure side, written to wire */
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61 int errfd; /* used like writefd or readfd, depending if it's client or server.
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62 Doesn't exactly belong here, but is cleaner here */
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63 circbuffer *writebuf; /* data from the wire, for local consumption. Can be
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64 initially NULL */
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65 circbuffer *extrabuf; /* extended-data for the program - used like writebuf
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66 but for stderr */
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68 /* whether close/eof messages have been exchanged */
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69 int sent_close, recv_close;
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70 int recv_eof, sent_eof;
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71
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72 /* Set after running the ChanType-specific close hander
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73 * to ensure we don't run it twice (nor type->checkclose()). */
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74 int close_handler_done;
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75
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76 struct dropbear_progress_connection *conn_pending;
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77 int initconn; /* used for TCP forwarding, whether the channel has been
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78 fully initialised */
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79
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80 int await_open; /* flag indicating whether we've sent an open request
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81 for this channel (and are awaiting a confirmation
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82 or failure). */
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83
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84 int flushing;
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85
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86 /* Used by client chansession to handle ~ escaping, NULL ignored otherwise */
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87 void (*read_mangler)(struct Channel*, unsigned char* bytes, int *len);
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88
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89 const struct ChanType* type;
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90
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91 enum dropbear_channel_prio prio;
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92 };
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93
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94 struct ChanType {
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95
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96 int sepfds; /* Whether this channel has separate pipes for in/out or not */
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97 char *name;
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98 int (*inithandler)(struct Channel*);
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99 int (*check_close)(struct Channel*);
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100 void (*reqhandler)(struct Channel*);
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101 void (*closehandler)(struct Channel*);
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102 };
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103
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104 /* Callback for connect_remote */
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105 void channel_connect_done(int result, int sock, void* user_data, const char* errstring);
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106
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107 void chaninitialise(const struct ChanType *chantypes[]);
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108 void chancleanup();
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109 void setchannelfds(fd_set *readfd, fd_set *writefd);
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110 void channelio(fd_set *readfd, fd_set *writefd);
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111 struct Channel* getchannel();
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112 /* Returns an arbitrary channel that is in a ready state - not
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113 being initialised and no EOF in either direction. NULL if none. */
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114 struct Channel* get_any_ready_channel();
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115
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116 void recv_msg_channel_open();
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117 void recv_msg_channel_request();
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118 void send_msg_channel_failure(struct Channel *channel);
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119 void send_msg_channel_success(struct Channel *channel);
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120 void recv_msg_channel_data();
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121 void recv_msg_channel_extended_data();
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122 void recv_msg_channel_window_adjust();
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123 void recv_msg_channel_close();
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124 void recv_msg_channel_eof();
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125
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126 void common_recv_msg_channel_data(struct Channel *channel, int fd,
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127 circbuffer * buf);
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128
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129 #ifdef DROPBEAR_CLIENT
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130 extern const struct ChanType clichansess;
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131 #endif
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132
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133 #if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT)
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134 int send_msg_channel_open_init(int fd, const struct ChanType *type);
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135 void recv_msg_channel_open_confirmation();
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136 void recv_msg_channel_open_failure();
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137 #endif
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138 void start_send_channel_request(struct Channel *channel, unsigned char *type);
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139
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140 void send_msg_request_success();
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141 void send_msg_request_failure();
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142
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144 #endif /* DROPBEAR_CHANNEL_H_ */