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annotate channel.h @ 1718:72bb7fb1fced

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Fix "make install" for manpages in out-of-tree builds
author Gabor Z. Papp <gzp@papp.hu>
date Mon, 15 Jun 2020 23:17:27 +0800
parents 79eef94ccea9
children c584b5602bd8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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67
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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 struct dropbear_progress_connection *conn_pending;
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73 int initconn; /* used for TCP forwarding, whether the channel has been
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74 fully initialised */
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75
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76 int await_open; /* flag indicating whether we've sent an open request
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77 for this channel (and are awaiting a confirmation
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78 or failure). */
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79
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80 int flushing;
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81
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82 /* Used by client chansession to handle ~ escaping, NULL ignored otherwise */
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83 void (*read_mangler)(const struct Channel*, const unsigned char* bytes, int *len);
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84
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85 const struct ChanType* type;
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86
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87 enum dropbear_channel_prio prio;
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88 };
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89
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90 struct ChanType {
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91
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92 int sepfds; /* Whether this channel has separate pipes for in/out or not */
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93 const char *name;
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94 /* Sets up the channel */
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95 int (*inithandler)(struct Channel*);
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96 /* Called to check whether a channel should close, separately from the FD being closed.
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97 Used for noticing process exiting */
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98 int (*check_close)(const struct Channel*);
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99 /* Handler for ssh_msg_channel_request */
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100 void (*reqhandler)(struct Channel*);
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101 /* Called prior to sending ssh_msg_channel_close, used for sending exit status */
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102 void (*closehandler)(const struct Channel*);
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103 /* Frees resources, called just prior to channel being removed */
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104 void (*cleanup)(const struct Channel*);
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105 };
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107 /* Callback for connect_remote */
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108 void channel_connect_done(int result, int sock, void* user_data, const char* errstring);
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109
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110 void chaninitialise(const struct ChanType *chantypes[]);
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111 void chancleanup(void);
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112 void setchannelfds(fd_set *readfds, fd_set *writefds, int allow_reads);
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113 void channelio(const fd_set *readfd, const fd_set *writefd);
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114 struct Channel* getchannel(void);
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115 /* Returns an arbitrary channel that is in a ready state - not
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116 being initialised and no EOF in either direction. NULL if none. */
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117 struct Channel* get_any_ready_channel(void);
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118
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119 void recv_msg_channel_open(void);
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120 void recv_msg_channel_request(void);
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121 void send_msg_channel_failure(const struct Channel *channel);
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122 void send_msg_channel_success(const struct Channel *channel);
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123 void recv_msg_channel_data(void);
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124 void recv_msg_channel_extended_data(void);
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125 void recv_msg_channel_window_adjust(void);
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126 void recv_msg_channel_close(void);
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127 void recv_msg_channel_eof(void);
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128
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129 void common_recv_msg_channel_data(struct Channel *channel, int fd,
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130 circbuffer * buf);
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131
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132 #if DROPBEAR_CLIENT
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133 extern const struct ChanType clichansess;
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134 #endif
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135
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136 #if DROPBEAR_LISTENERS || DROPBEAR_CLIENT
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137 int send_msg_channel_open_init(int fd, const struct ChanType *type);
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138 void recv_msg_channel_open_confirmation(void);
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139 void recv_msg_channel_open_failure(void);
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140 #endif
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Francois Perrad <francois.perrad@gadz.org>
parents: 1295
diff changeset
141 void start_send_channel_request(const struct Channel *channel, const char *type);
4
fe6bca95afa7 Makefile.in contains updated files required
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
142
1276
9169e4e7cbee fix empty C prototypes
Francois Perrad <francois.perrad@gadz.org>
parents: 1097
diff changeset
143 void send_msg_request_success(void);
9169e4e7cbee fix empty C prototypes
Francois Perrad <francois.perrad@gadz.org>
parents: 1097
diff changeset
144 void send_msg_request_failure(void);
937
4ad38e223ccd Send a failure response if a client receives a global request
Matt Johnston <matt@ucc.asn.au>
parents: 722
diff changeset
145
970
0bb16232e7c4 Make keepalive handling more robust, this should now match what OpenSSH does
Matt Johnston <matt@ucc.asn.au>
parents: 941
diff changeset
146
1036
deed0571cacc DROPBEAR_ prefix for include guards to avoid collisions
Thorsten Horstmann <thorsten.horstmann@web.de>
parents: 970
diff changeset
147 #endif /* DROPBEAR_CHANNEL_H_ */