annotate dbclient.1 @ 821:f8b28a3de6cb

Don't say "SSH 2" any more since protocol version 1 is irrelevant
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Oct 2013 23:50:04 +0800
parents 0e5ea6812bb7
children 5608a5a61c2a
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1 .TH dbclient 1
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2 .SH NAME
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3 dbclient \- lightweight SSH client
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4 .SH SYNOPSIS
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5 .B dbclient
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6 [\-Tt] [\-p
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7 .I port\fR] [\-i
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8 .I id\fR] [\-L
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9 .I l\fR:\fIh\fR:\fIr\fR] [\-R
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10 .I l\fR:\fIh\fR:\fIr\fR] [\-l
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11 .IR user ]
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12 .I host
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13 .RI [ command ]
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14
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15 .B dbclient
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16 [
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17 .I args ]
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18 .I [user1]@host1[%port1],[user2]@host2[%port2],...
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19
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20 .SH DESCRIPTION
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21 .B dbclient
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22 is a SSH client designed to be small enough to be used in small memory
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23 environments, while still being functional and secure enough for general use.
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24 .SH OPTIONS
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25 .TP
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26 .B \-p \fIport
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27 Connect to
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28 .I port
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29 on the remote host. Alternatively a port can be specified as hostname%port.
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30 Default is 22.
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31 .TP
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32 .B \-i \fIidfile
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33 Identity file.
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34 Read the identity key from file
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35 .I idfile
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36 (multiple allowed). This file is created with dropbearkey(1) or converted
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37 from OpenSSH with dropbearconvert(1).
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38 .TP
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39 .B \-L [\fIlistenaddress\fR]:\fIlistenport\fR:\fIhost\fR:\fIport\fR
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40 Local port forwarding.
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41 Forward the port
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42 .I listenport
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43 on the local host through the SSH connection to port
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44 .I port
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45 on the host
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46 .IR host .
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47 .TP
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48 .B \-R [\fIlistenaddress\fR]:\fIlistenport\fR:\fIhost\fR:\fIport\fR
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49 Remote port forwarding.
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50 Forward the port
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51 .I listenport
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52 on the remote host through the SSH connection to port
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53 .I port
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54 on the host
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55 .IR host .
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56 .TP
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57 .B \-l \fIuser
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58 Username.
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59 Login as
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60 .I user
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61 on the remote host.
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62 .TP
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63 .B \-t
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64 Allocate a PTY.
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65 .TP
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66 .B \-T
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67 Don't allocate a PTY.
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68 .TP
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69 .B \-N
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70 Don't request a remote shell or run any commands. Any command arguments are ignored.
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71 .TP
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72 .B \-f
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73 Fork into the background after authentication. A command argument (or -N) is required.
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74 This is useful when using password authentication.
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75 .TP
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76 .B \-g
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77 Allow non-local hosts to connect to forwarded ports. Applies to -L and -R
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78 forwarded ports, though remote connections to -R forwarded ports may be limited
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79 by the ssh server.
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80 .TP
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81 .B \-y
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82 Always accept hostkeys if they are unknown. If a hostkey mismatch occurs the
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83 connection will abort as normal. If specified a second time no host key checking
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84 is performed at all, this is usually undesirable.
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85 .TP
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86 .B \-A
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87 Forward agent connections to the remote host. dbclient will use any
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88 OpenSSH-style agent program if available ($SSH_AUTH_SOCK will be set) for
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89 public key authentication. Forwarding is only enabled if -A is specified.
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90 .TP
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91 .B \-W \fIwindowsize
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92 Specify the per-channel receive window buffer size. Increasing this
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93 may improve network performance at the expense of memory use. Use -h to see the
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94 default buffer size.
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95 .TP
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96 .B \-K \fItimeout_seconds
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97 Ensure that traffic is transmitted at a certain interval in seconds. This is
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98 useful for working around firewalls or routers that drop connections after
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99 a certain period of inactivity. The trade-off is that a session may be
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100 closed if there is a temporary lapse of network connectivity. A setting
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101 if 0 disables keepalives.
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102 .TP
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103 .B \-I \fIidle_timeout
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104 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds.
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105 .TP
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106 .B \-J \fIproxy_command
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107 Use the standard input/output of the program \fIproxy_command\fR rather than using
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108 a normal TCP connection. A hostname should be still be provided, as this is used for
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109 comparing saved hostkeys.
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110 .TP
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111 .B \-B \fIendhost:endport
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112 "Netcat-alike" mode, where Dropbear will connect to the given host, then create a
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113 forwarded connection to \fIendhost\fR. This will then be presented as dbclient's
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114 standard input/output.
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115 .TP
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116 .B \-c \fIcipherlist
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117 Specify a comma separated list of ciphers to enable. Use \fI-c help\fR to list possibilities.
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118 .TP
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119 .B \-m \fIMAClist
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120 Specify a comma separated list of authentication MACs to enable. Use \fI-m help\fR to list possibilities.
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121 .TP
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122 .B \-s
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123 The specified command will be requested as a subsystem, used for sftp. Dropbear doesn't implement sftp itself but the OpenSSH sftp client can be used eg \fIsftp -S dbclient [email protected]\fR
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124
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125 .SH MULTI-HOP
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126 Dropbear will also allow multiple "hops" to be specified, separated by commas. In
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127 this case a connection will be made to the first host, then a TCP forwarded
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128 connection will be made through that to the second host, and so on. Hosts other than
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129 the final destination will not see anything other than the encrypted SSH stream.
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130 A port for a host can be specified with a hash (eg [email protected]%44 ).
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131 This syntax can also be used with scp or rsync (specifying dbclient as the
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132 ssh/rsh command). A file can be "bounced" through multiple SSH hops, eg
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133
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134 scp -S dbclient [email protected],[email protected],canyons:/tmp/dump .
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135
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136 Note that hostnames are resolved by the prior hop (so "canyons" would be resolved by the host "wrt")
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137 in the example above, the same way as other -L TCP forwarded hosts are. Host keys are
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138 checked locally based on the given hostname.
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139
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140 .SH ESCAPE CHARACTERS
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141 Typing a newline followed by the key sequence \fI~.\fR (tilde, dot) will terminate a connection.
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142 The sequence \fI~^Z\fR (tilde, ctrl-z) will background the connection. This behaviour only
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143 applies when a PTY is used.
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144
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145 .SH ENVIRONMENT
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146 .TP
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147 .B DROPBEAR_PASSWORD
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148 A password to use for remote authentication can be specified in the environment
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149 variable DROPBEAR_PASSWORD. Care should be taken that the password is not
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150 exposed to other users on a multi-user system, or stored in accessible files.
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151 .TP
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152 .B SSH_ASKPASS
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153 dbclient can use an external program to request a password from a user.
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154 SSH_ASKPASS should be set to the path of a program that will return a password
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155 on standard output. This program will only be used if either DISPLAY is set and
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156 standard input is not a TTY, or the environment variable SSH_ASKPASS_ALWAYS is
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157 set.
180
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158 .SH AUTHOR
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159 Matt Johnston ([email protected]).
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160 .br
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161 Mihnea Stoenescu wrote initial Dropbear client support
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162 .br
180
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163 Gerrit Pape ([email protected]) wrote this manual page.
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164 .SH SEE ALSO
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165 dropbear(8), dropbearkey(1)
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166 .P
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167 https://matt.ucc.asn.au/dropbear/dropbear.html