annotate dbclient.1 @ 1206:2907c658fa76

Implemented ExitOnForwardFailure option for local and remote forwarding.
author Konstantin Tokarev <ktokarev@smartlabs.tv>
date Mon, 30 Nov 2015 20:30:58 +0300
parents 80cacacfec23
children bf626d259eb1
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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 [\fIflag arguments\fR] [\-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:\fIp\fR] [\-R
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10 .I l\fR:\fIh\fR:\fIp\fR] [\-l
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11 .IR user ]
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12 .I host
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13 .RI [ \fImore\ flags\fR ]
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14 .RI [ command ]
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15
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16 .B dbclient
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17 [\fIargs\fR]
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18 [\fIuser1\fR]@\fIhost1\fR[^\fIport1\fR],[\fIuser2\fR]@\fIhost2\fR[^\fIport2\fR],...
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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 small SSH client
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23 .SH OPTIONS
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24 .TP
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25 .TP
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26 .B command
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27 A command to run on the remote host. This will normally be run by the remote host
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28 using the user's shell. The command begins at the first hyphen argument after the
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29 host argument. If no command is specified an interactive terminal will be opened
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30 (see -t and -T).
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31 .TP
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32 .B \-p \fIport
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33 Connect to
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34 .I port
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35 on the remote host. Alternatively a port can be specified as hostname^port.
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36 Default is 22.
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37 .TP
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38 .B \-i \fIidfile
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39 Identity file.
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40 Read the identity key from file
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41 .I idfile
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42 (multiple allowed). This file is created with dropbearkey(1) or converted
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43 from OpenSSH with dropbearconvert(1). The default path ~/.ssh/id_dropbear is used
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44 .TP
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45 .B \-L\fR [\fIlistenaddress\fR]:\fIlistenport\fR:\fIhost\fR:\fIport\fR
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46 Local port forwarding.
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47 Forward the port
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48 .I listenport
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49 on the local host through the SSH connection to port
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50 .I port
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51 on the host
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52 .IR host .
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53 .TP
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54 .B \-R\fR [\fIlistenaddress\fR]:\fIlistenport\fR:\fIhost\fR:\fIport\fR
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55 Remote port forwarding.
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56 Forward the port
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57 .I listenport
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58 on the remote host through the SSH connection to port
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59 .I port
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60 on the host
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61 .IR host .
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62 .TP
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63 .B \-l \fIuser
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64 Username.
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65 Login as
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66 .I user
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67 on the remote host.
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68 .TP
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69 .B \-t
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70 Allocate a PTY. This is the default when no command is given, it gives a full
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71 interactive remote session. The main effect is that keystrokes are sent remotely
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72 immediately as opposed to local line-based editing.
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73 .TP
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74 .B \-T
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75 Don't allocate a PTY. This is the default a command is given. See -t.
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76 .TP
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77 .B \-N
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78 Don't request a remote shell or run any commands. Any command arguments are ignored.
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79 .TP
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80 .B \-f
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81 Fork into the background after authentication. A command argument (or -N) is required.
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82 This is useful when using password authentication.
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83 .TP
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84 .B \-g
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85 Allow non-local hosts to connect to forwarded ports. Applies to -L and -R
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86 forwarded ports, though remote connections to -R forwarded ports may be limited
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87 by the ssh server.
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88 .TP
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89 .B \-y
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90 Always accept hostkeys if they are unknown. If a hostkey mismatch occurs the
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91 connection will abort as normal. If specified a second time no host key checking
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92 is performed at all, this is usually undesirable.
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93 .TP
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94 .B \-A
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95 Forward agent connections to the remote host. dbclient will use any
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96 OpenSSH-style agent program if available ($SSH_AUTH_SOCK will be set) for
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97 public key authentication. Forwarding is only enabled if -A is specified.
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98 .TP
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99 .B \-W \fIwindowsize
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100 Specify the per-channel receive window buffer size. Increasing this
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101 may improve network performance at the expense of memory use. Use -h to see the
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102 default buffer size.
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103 .TP
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104 .B \-K \fItimeout_seconds
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105 Ensure that traffic is transmitted at a certain interval in seconds. This is
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106 useful for working around firewalls or routers that drop connections after
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107 a certain period of inactivity. The trade-off is that a session may be
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108 closed if there is a temporary lapse of network connectivity. A setting
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109 if 0 disables keepalives. If no response is received for 3 consecutive keepalives the connection will be closed.
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110 .TP
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111 .B \-I \fIidle_timeout
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112 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds.
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113 .TP
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114 .B \-J \fIproxy_command
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115 Use the standard input/output of the program \fIproxy_command\fR rather than using
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116 a normal TCP connection. A hostname should be still be provided, as this is used for
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117 comparing saved hostkeys.
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118 .TP
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119 .B \-B \fIendhost:endport
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120 "Netcat-alike" mode, where Dropbear will connect to the given host, then create a
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121 forwarded connection to \fIendhost\fR. This will then be presented as dbclient's
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122 standard input/output.
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123 .TP
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124 .B \-c \fIcipherlist
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125 Specify a comma separated list of ciphers to enable. Use \fI-c help\fR to list possibilities.
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126 .TP
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127 .B \-m \fIMAClist
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128 Specify a comma separated list of authentication MACs to enable. Use \fI-m help\fR to list possibilities.
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129 .TP
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130 .B \-o \fIoption
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131 Can be used to give options in the format used by OpenSSH config file. This is
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132 useful for specifying options for which there is no separate command-line flag.
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133 For full details of the options listed below, and their possible values, see
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134 ssh_config(5).
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135
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136 For now only following options have been implemented:
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137 .RS
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138 .RS
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139 .TP
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140 ExitOnForwardFailure
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141 .RE
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142 .RE
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143 .TP
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144 .B \-s
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145 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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146 .TP
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147 .B \-V
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148 Print the version
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149
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150 .SH MULTI-HOP
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151 Dropbear will also allow multiple "hops" to be specified, separated by commas. In
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152 this case a connection will be made to the first host, then a TCP forwarded
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153 connection will be made through that to the second host, and so on. Hosts other than
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154 the final destination will not see anything other than the encrypted SSH stream.
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155 A port for a host can be specified with a caret (eg [email protected]^44 ).
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156 This syntax can also be used with scp or rsync (specifying dbclient as the
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157 ssh/rsh command). A file can be "bounced" through multiple SSH hops, eg
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158
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159 scp -S dbclient [email protected],[email protected],canyons:/tmp/dump .
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160
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161 Note that hostnames are resolved by the prior hop (so "canyons" would be resolved by the host "wrt")
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162 in the example above, the same way as other -L TCP forwarded hosts are. Host keys are
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163 checked locally based on the given hostname.
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164
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165 .SH ESCAPE CHARACTERS
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166 Typing a newline followed by the key sequence \fI~.\fR (tilde, dot) will terminate a connection.
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167 The sequence \fI~^Z\fR (tilde, ctrl-z) will background the connection. This behaviour only
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168 applies when a PTY is used.
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169
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170 .SH ENVIRONMENT
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171 .TP
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172 .B DROPBEAR_PASSWORD
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173 A password to use for remote authentication can be specified in the environment
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174 variable DROPBEAR_PASSWORD. Care should be taken that the password is not
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175 exposed to other users on a multi-user system, or stored in accessible files.
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176 .TP
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177 .B SSH_ASKPASS
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178 dbclient can use an external program to request a password from a user.
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179 SSH_ASKPASS should be set to the path of a program that will return a password
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180 on standard output. This program will only be used if either DISPLAY is set and
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181 standard input is not a TTY, or the environment variable SSH_ASKPASS_ALWAYS is
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182 set.
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183 .SH NOTES
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184 If compiled with zlib support and if the server supports it, dbclient will
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185 always use compression.
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186
180
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187 .SH AUTHOR
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188 Matt Johnston ([email protected]).
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189 .br
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190 Mihnea Stoenescu wrote initial Dropbear client support
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191 .br
180
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192 Gerrit Pape ([email protected]) wrote this manual page.
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193 .SH SEE ALSO
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194 dropbear(8), dropbearkey(1)
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195 .P
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196 https://matt.ucc.asn.au/dropbear/dropbear.html