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annotate dbclient.1 @ 1065:23103e1e9548

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Fix error handling for dbclient async connect
author Matt Johnston <matt@ucc.asn.au>
date Tue, 03 Mar 2015 20:53:00 +0800
parents 295a08e9d07e
children 67d8a904f5a9
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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 small SSH client
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23 .SH OPTIONS
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24 .TP
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25 .B \-p \fIport
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26 Connect to
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27 .I port
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28 on the remote host. Alternatively a port can be specified as hostname^port.
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29 Default is 22.
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30 .TP
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31 .B \-i \fIidfile
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32 Identity file.
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33 Read the identity key from file
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34 .I idfile
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35 (multiple allowed). This file is created with dropbearkey(1) or converted
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36 from OpenSSH with dropbearconvert(1). The default path ~/.ssh/id_dropbear is used
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37 .TP
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38 .B \-L [\fIlistenaddress\fR]:\fIlistenport\fR:\fIhost\fR:\fIport\fR
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39 Local port forwarding.
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40 Forward the port
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41 .I listenport
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42 on the local host through the SSH connection to port
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43 .I port
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44 on the host
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45 .IR host .
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46 .TP
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47 .B \-R [\fIlistenaddress\fR]:\fIlistenport\fR:\fIhost\fR:\fIport\fR
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48 Remote port forwarding.
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49 Forward the port
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50 .I listenport
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51 on the remote host through the SSH connection to port
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52 .I port
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53 on the host
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54 .IR host .
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55 .TP
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56 .B \-l \fIuser
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57 Username.
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58 Login as
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59 .I user
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60 on the remote host.
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61 .TP
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62 .B \-t
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63 Allocate a PTY.
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64 .TP
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65 .B \-T
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66 Don't allocate a PTY.
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67 .TP
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68 .B \-N
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69 Don't request a remote shell or run any commands. Any command arguments are ignored.
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70 .TP
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71 .B \-f
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72 Fork into the background after authentication. A command argument (or -N) is required.
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73 This is useful when using password authentication.
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74 .TP
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75 .B \-g
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76 Allow non-local hosts to connect to forwarded ports. Applies to -L and -R
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77 forwarded ports, though remote connections to -R forwarded ports may be limited
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78 by the ssh server.
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79 .TP
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80 .B \-y
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81 Always accept hostkeys if they are unknown. If a hostkey mismatch occurs the
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82 connection will abort as normal. If specified a second time no host key checking
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83 is performed at all, this is usually undesirable.
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84 .TP
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85 .B \-A
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86 Forward agent connections to the remote host. dbclient will use any
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87 OpenSSH-style agent program if available ($SSH_AUTH_SOCK will be set) for
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88 public key authentication. Forwarding is only enabled if -A is specified.
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89 .TP
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90 .B \-W \fIwindowsize
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91 Specify the per-channel receive window buffer size. Increasing this
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92 may improve network performance at the expense of memory use. Use -h to see the
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93 default buffer size.
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94 .TP
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95 .B \-K \fItimeout_seconds
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96 Ensure that traffic is transmitted at a certain interval in seconds. This is
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97 useful for working around firewalls or routers that drop connections after
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98 a certain period of inactivity. The trade-off is that a session may be
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99 closed if there is a temporary lapse of network connectivity. A setting
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100 if 0 disables keepalives. If no response is received for 3 consecutive keepalives the connection will be closed.
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101 .TP
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102 .B \-I \fIidle_timeout
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103 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds.
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104 .TP
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105 .B \-J \fIproxy_command
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106 Use the standard input/output of the program \fIproxy_command\fR rather than using
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107 a normal TCP connection. A hostname should be still be provided, as this is used for
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108 comparing saved hostkeys.
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109 .TP
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110 .B \-B \fIendhost:endport
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111 "Netcat-alike" mode, where Dropbear will connect to the given host, then create a
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112 forwarded connection to \fIendhost\fR. This will then be presented as dbclient's
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113 standard input/output.
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114 .TP
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115 .B \-c \fIcipherlist
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116 Specify a comma separated list of ciphers to enable. Use \fI-c help\fR to list possibilities.
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117 .TP
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118 .B \-m \fIMAClist
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119 Specify a comma separated list of authentication MACs to enable. Use \fI-m help\fR to list possibilities.
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120 .TP
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121 .B \-s
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122 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 user@host\fR
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123 .TP
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124 .B \-V
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125 Print the version
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126
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127 .SH MULTI-HOP
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128 Dropbear will also allow multiple "hops" to be specified, separated by commas. In
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129 this case a connection will be made to the first host, then a TCP forwarded
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130 connection will be made through that to the second host, and so on. Hosts other than
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131 the final destination will not see anything other than the encrypted SSH stream.
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132 A port for a host can be specified with a hash (eg matt@martello^44 ).
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133 This syntax can also be used with scp or rsync (specifying dbclient as the
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134 ssh/rsh command). A file can be "bounced" through multiple SSH hops, eg
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135
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136 scp -S dbclient matt@martello,root@wrt,canyons:/tmp/dump .
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137
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138 Note that hostnames are resolved by the prior hop (so "canyons" would be resolved by the host "wrt")
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139 in the example above, the same way as other -L TCP forwarded hosts are. Host keys are
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140 checked locally based on the given hostname.
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141
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142 .SH ESCAPE CHARACTERS
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143 Typing a newline followed by the key sequence \fI~.\fR (tilde, dot) will terminate a connection.
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144 The sequence \fI~^Z\fR (tilde, ctrl-z) will background the connection. This behaviour only
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145 applies when a PTY is used.
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146
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147 .SH ENVIRONMENT
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148 .TP
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149 .B DROPBEAR_PASSWORD
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150 A password to use for remote authentication can be specified in the environment
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151 variable DROPBEAR_PASSWORD. Care should be taken that the password is not
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152 exposed to other users on a multi-user system, or stored in accessible files.
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153 .TP
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154 .B SSH_ASKPASS
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155 dbclient can use an external program to request a password from a user.
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156 SSH_ASKPASS should be set to the path of a program that will return a password
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157 on standard output. This program will only be used if either DISPLAY is set and
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158 standard input is not a TTY, or the environment variable SSH_ASKPASS_ALWAYS is
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159 set.
180
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160 .SH AUTHOR
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161 Matt Johnston ([email protected]).
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162 .br
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163 Mihnea Stoenescu wrote initial Dropbear client support
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164 .br
180
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165 Gerrit Pape ([email protected]) wrote this manual page.
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166 .SH SEE ALSO
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167 dropbear(8), dropbearkey(1)
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168 .P
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169 https://matt.ucc.asn.au/dropbear/dropbear.html