1nbdkit-curl-plugin(1) NBDKIT nbdkit-curl-plugin(1)
2
6 nbdkit-curl-plugin - nbdkit curl plugin (HTTP, FTP and other protocols)
7
9 nbdkit -r curl [url=]http://example.com/disk.img
10
12 "nbdkit-curl-plugin" is a plugin for nbdkit(1) which turns content
13 served over HTTP, FTP, and more, into a Network Block Device. It uses
14 a library called libcurl (also known as cURL) to read data from URLs.
15 The exact list of protocols that libcurl can handle depends on how it
16 was compiled, but most versions will handle HTTP, HTTPS, FTP, FTPS and
17 more (see: "curl -V").
18 Note: This plugin supports writes. However for HTTP, you may not want
20 nbdkit to issue PUT requests to the remote server (which probably
21 doesn't understand them). To force nbdkit to use a readonly
22 connection, pass the -r flag.
23 Although this plugin can access SFTP (ie. SSH) servers, it is much
25 better to use nbdkit-ssh-plugin(1).
26
28 nbdkit -r curl http://example.com/disk.img
29 serves the remote disk image as NBD on TCP port 10809 (to control ports
31 and protocols used to serve NBD see nbdkit(1)).
32
34 cookie=COOKIE
35 cookie=+FILENAME
36 Set a cookie in the request header when connecting to the remote
37 server.
38 A typical example is:
40 cookie='vmware_soap_session="52a01262-bf93-ccce-d379-8dabb3e55560"'
42 This option can be used at most once. It only works for HTTP and
44 HTTPS transports. To set multiple cookies you must concatenate
45 them yourself, eg:
46 cookie='name1=content1; name2=content2;'
48 See CURLOPT_COOKIE(3) for more information about this.
50 If the cookie is used for authentication then passing it on the
52 command line is not secure on shared machines. Use the alternate
53 "+FILENAME" syntax to pass it in a file.
54 password=PASSWORD
56 Set the password to use when connecting to the remote server.
57 Note that passing this on the command line is not secure on shared
59 machines.
60 password=-
62 Ask for the password (interactively) when nbdkit starts up.
63 password=+FILENAME
65 Read the password from the named file. This is the most secure
66 method to supply a password, as long as you set the permissions on
67 the file appropriately.
68 protocols=PROTO,PROTO,...
70 Limit the protocols that are allowed in the URL. Use this option
71 for extra security if the URL comes from an untrusted source and
72 you want to avoid security isues in the more obscure protocols that
73 curl supports. (See qemu CVE-2013-0249 for an example of a
74 security bug introduced by allowing unrestricted protocols).
75 For example if you only intend HTTP and HTTPS URLs to be used, then
77 add this parameter: "protocols=http,https"
78 The value of this parameter is a comma-separated list of protocols.
80 The following protocols are known: dict, file, ftp, ftps, gopher,
81 http, https, imap, imaps, ldap, ldaps, pop3, pop3s, rtmp, rtmpe,
82 rtmps, rtmpt, rtmpte, rtmpts, rtsp, scp, sftp, smb, smbs, smtp,
83 smtps, telnet, tftp.
84 The default is to allow any protocol.
86 proxy-password=PASSWORD
88 proxy-password=-
89 proxy-password=+FILENAME
90 proxy-user=USERNAME
91 Set the proxy username and password.
92 sslverify=false
94 Don't verify the SSL certificate of the remote host.
95 timeout=SECS
97 Set the timeout for requests.
98 timeout=0
100 Use the default libcurl timeout for requests.
101 unix-socket-path=PATH
103 Instead of using a TCP connection, connect to the server over the
104 named Unix domain socket. See "CURLOPT_UNIX_SOCKET_PATH" in
105 curl_easy_setopt(3).
106 [url=]URL
108 The URL of the remote disk image. This is passed to libcurl
109 directly via "CURLOPT_URL" in curl_easy_setopt(3).
110 This parameter is required.
112 "url=" is a magic config key and may be omitted in most cases. See
114 "Magic parameters" in nbdkit(1).
115 user=USERNAME
117 Set the username to use when connecting to the remote server. This
118 may also be set in the URL (eg. "http://foo@example.com/disk.img")
119
121 -D curl.verbose=1
122 This enables very verbose curl debugging. See CURLOPT_VERBOSE(3).
123 This is mainly useful if you suspect there is a bug inside libcurl
124 itself.
125
127 curl(1), libcurl(3), CURLOPT_COOKIE(3) CURLOPT_VERBOSE(3), nbdkit(1),
128 nbdkit-readahead-filter(1), nbdkit-ssh-plugin(1), nbdkit-plugin(3),
129 http://curl.haxx.se.
130
132 Richard W.M. Jones
133 Parts derived from Alexander Graf's "QEMU Block driver for CURL
135 images".
136
138 Copyright (C) 2014 Red Hat Inc.
139
141 Redistribution and use in source and binary forms, with or without
142 modification, are permitted provided that the following conditions are
143 met:
144 · Redistributions of source code must retain the above copyright
146 notice, this list of conditions and the following disclaimer.
147 · Redistributions in binary form must reproduce the above copyright
149 notice, this list of conditions and the following disclaimer in the
150 documentation and/or other materials provided with the
151 distribution.
152 · Neither the name of Red Hat nor the names of its contributors may
154 be used to endorse or promote products derived from this software
155 without specific prior written permission.
156 THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY
158 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
159 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
160 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE
161 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
162 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
163 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
164 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
165 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
166 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
167 ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
168nbdkit-1.12.3 2019-05-21 nbdkit-curl-plugin(1)