curl.1

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

If this option is used several times, the last one will be used.
.IP "-e/--referer <URL>"
(HTTP) Sends the "Referer Page" information to the HTTP server. This can also
be set with the \fI-H/--header\fP flag of course.  When used with
\fI-L/--location\fP you can append ";auto" to the --referer URL to make curl
automatically set the previous URL when it follows a Location: header. The
\&";auto" string can be used alone, even if you don't set an initial --referer.

If this option is used several times, the last one will be used.
.IP "--engine <name>"
Select the OpenSSL crypto engine to use for cipher
operations. Use \fI--engine list\fP to print a list of build-time supported
engines. Note that not all (or none) of the engines may be available at
run-time.
.IP "--environment"
(RISC OS ONLY) Sets a range of environment variables, using the names the -w
option supports, to easier allow extraction of useful information after having
run curl.

If this option is used several times, each occurrence will toggle this on/off.
.IP "--egd-file <file>"
(SSL) Specify the path name to the Entropy Gathering Daemon socket. The socket
is used to seed the random engine for SSL connections. See also the
\fI--random-file\fP option.
.IP "-E/--cert <certificate[:password]>"
(SSL) Tells curl to use the specified certificate file when getting a file
with HTTPS or FTPS. The certificate must be in PEM format.  If the optional
password isn't specified, it will be queried for on the terminal. Note that
this option assumes a \&"certificate" file that is the private key and the
private certificate concatenated! See \fI--cert\fP and \fI--key\fP to specify
them independently.

If curl is built against the NSS SSL library then this option tells
curl the nickname of the certificate to use within the NSS database defined
by the environment variable SSL_DIR (or by default /etc/pki/nssdb). If the
NSS PEM PKCS#11 module (libnsspem.so) is available then PEM files may be
loaded.

If this option is used several times, the last one will be used.
.IP "--cert-type <type>"
(SSL) Tells curl what certificate type the provided certificate is in. PEM,
DER and ENG are recognized types.  If not specified, PEM is assumed.

If this option is used several times, the last one will be used.
.IP "--cacert <CA certificate>"
(SSL) Tells curl to use the specified certificate file to verify the
peer. The file may contain multiple CA certificates. The certificate(s) must
be in PEM format.

curl recognizes the environment variable named 'CURL_CA_BUNDLE' if that is
set, and uses the given path as a path to a CA cert bundle. This option
overrides that variable.

The windows version of curl will automatically look for a CA certs file named
\'curl-ca-bundle.crt\', either in the same directory as curl.exe, or in the
Current Working Directory, or in any folder along your PATH.

If curl is built against the NSS SSL library then this option tells
curl the nickname of the CA certificate to use within the NSS database
defined by the environment variable SSL_DIR (or by default /etc/pki/nssdb).
If the NSS PEM PKCS#11 module (libnsspem.so) is available then PEM files
may be loaded.

If this option is used several times, the last one will be used.
.IP "--capath <CA certificate directory>"
(SSL) Tells curl to use the specified certificate directory to verify the
peer. The certificates must be in PEM format, and the directory must have been
processed using the c_rehash utility supplied with openssl. Using
\fI--capath\fP can allow curl to make SSL-connections much more efficiently
than using \fI--cacert\fP if the \fI--cacert\fP file contains many CA
certificates.

If this option is used several times, the last one will be used.
.IP "-f/--fail"
(HTTP) Fail silently (no output at all) on server errors. This is mostly done
like this to better enable scripts etc to better deal with failed attempts. In
normal cases when a HTTP server fails to deliver a document, it returns an
HTML document stating so (which often also describes why and more). This flag
will prevent curl from outputting that and return error 22.

This method is not fail-safe and there are occasions where non-successful
response codes will slip through, especially when authentication is involved
(response codes 401 and 407).

If this option is used twice, the second will again disable silent failure.
.IP "--ftp-account [data]"
(FTP) When an FTP server asks for "account data" after user name and password
has been provided, this data is sent off using the ACCT command. (Added in
7.13.0)

If this option is used twice, the second will override the previous use.
.IP "--ftp-create-dirs"
(FTP) When an FTP or SFTP URL/operation uses a path that doesn't currently exist on
the server, the standard behavior of curl is to fail. Using this option, curl
will instead attempt to create missing directories.

If this option is used twice, the second will again disable directory creation.
.IP "--ftp-method [method]"
(FTP) Control what method curl should use to reach a file on a FTP(S)
server. The method argument should be one of the following alternatives:
.RS
.IP multicwd
curl does a single CWD operation for each path part in the given URL. For deep
hierarchies this means very many commands. This is how RFC1738 says it should
be done. This is the default but the slowest behavior.
.IP nocwd
curl does no CWD at all. curl will do SIZE, RETR, STOR etc and give a full
path to the server for all these commands. This is the fastest behavior.
.IP singlecwd
curl does one CWD with the full target directory and then operates on the file
\&"normally" (like in the multicwd case). This is somewhat more standards
compliant than 'nocwd' but without the full penalty of 'multicwd'.
.RE
.IP "--ftp-pasv"
(FTP) Use PASV when transferring. PASV is the internal default behavior, but
using this option can be used to override a previous --ftp-port option. (Added
in 7.11.0)

If this option is used several times, the following occurrences make no
difference.
.IP "--ftp-alternative-to-user <command>"
(FTP) If authenticating with the USER and PASS commands fails, send this
command.  When connecting to Tumbleweed's Secure Transport server over FTPS
using a client certificate, using "SITE AUTH" will tell the server to retrieve
the username from the certificate. (Added in 7.15.5)
.IP "--ftp-skip-pasv-ip"
(FTP) Tell curl to not use the IP address the server suggests in its response
to curl's PASV command when curl connects the data connection. Instead curl
will re-use the same IP address it already uses for the control
connection. (Added in 7.14.2)

This option has no effect if PORT, EPRT or EPSV is used instead of PASV.

If this option is used twice, the second will again use the server's suggested
address.
.IP "--ftp-ssl"
(FTP) Try to use SSL/TLS for the FTP connection.  Reverts to a non-secure
connection if the server doesn't support SSL/TLS.  See also
\fI--ftp-ssl-control\fP and \fI--ftp-ssl-reqd\fP for different levels of
encryption required. (Added in 7.11.0)

If this option is used twice, the second will again disable this.
.IP "--ftp-ssl-control"
(FTP) Require SSL/TLS for the ftp login, clear for transfer.  Allows secure
authentication, but non-encrypted data transfers for efficiency.  Fails the
transfer if the server doesn't support SSL/TLS.  (Added in 7.16.0)

If this option is used twice, the second will again disable this.
.IP "--ftp-ssl-reqd"
(FTP) Require SSL/TLS for the FTP connection.
Terminates the connection if the server doesn't support SSL/TLS.
(Added in 7.15.5)

If this option is used twice, the second will again disable this.
.IP "--ftp-ssl-ccc"
(FTP) Use CCC (Clear Command Channel)
Shuts down the SSL/TLS layer after authenticating. The rest of the
control channel communication will be unencrypted. This allows
NAT routers to follow the FTP transaction. The default mode is
passive. See --ftp-ssl-ccc-mode for other modes.
(Added in 7.16.1)

If this option is used twice, the second will again disable this.
.IP "--ftp-ssl-ccc-mode [active/passive]"
(FTP) Use CCC (Clear Command Channel)
Sets the CCC mode. The passive mode will not initiate the shutdown, but
instead wait for the server to do it, and will not reply to the
shutdown from the server. The active mode initiates the shutdown and
waits for a reply from the server.
(Added in 7.16.2)
.IP "-F/--form <name=content>"
(HTTP) This lets curl emulate a filled in form in which a user has pressed the
submit button. This causes curl to POST data using the Content-Type
multipart/form-data according to RFC1867. This enables uploading of binary
files etc. To force the 'content' part to be a file, prefix the file name
with an @ sign. To just get the content part from a file, prefix the file name
with the letter <. The difference between @ and < is then that @ makes a file
get attached in the post as a file upload, while the < makes a text field and
just get the contents for that text field from a file.

Example, to send your password file to the server, where
\&'password' is the name of the form-field to which /etc/passwd will be the
input:

\fBcurl\fP -F password=@/etc/passwd www.mypasswords.com

To read the file's content from stdin instead of a file, use - where the file
name should've been. This goes for both @ and < constructs.

You can also tell curl what Content-Type to use by using 'type=', in a manner
similar to:

\fBcurl\fP -F "web=@index.html;type=text/html" url.com

or

\fBcurl\fP -F "name=daniel;type=text/foo" url.com

You can also explicitly change the name field of an file upload part by
setting filename=, like this:

\fBcurl\fP -F "file=@localfile;filename=nameinpost" url.com

See further examples and details in the MANUAL.

This option can be used multiple times.
.IP "--form-string <name=string>"
(HTTP) Similar to \fI--form\fP except that the value string for the named
parameter is used literally. Leading \&'@' and \&'<' characters, and the
\&';type=' string in the value have no special meaning. Use this in preference
to \fI--form\fP if there's any possibility that the string value may
accidentally trigger the \&'@' or \&'<' features of \fI--form\fP.
.IP "-g/--globoff"
This option switches off the "URL globbing parser". When you set this option,
you can specify URLs that contain the letters {}[] without having them being
interpreted by curl itself. Note that these letters are not normal legal URL
contents but they should be encoded according to the URI standard.
.IP "-G/--get"
When used, this option will make all data specified with \fI-d/--data\fP or
\fI--data-binary\fP to be used in a HTTP GET request instead of the POST
request that otherwise would be used. The data will be appended to the URL
with a '?'  separator.

If used in combination with -I, the POST data will instead be appended to the
URL with a HEAD request.

If this option is used several times, the following occurrences make no
difference.
.IP "-h/--help"
Usage help.
.IP "-H/--header <header>"
(HTTP) Extra header to use when getting a web page. You may specify any number
of extra headers. Note that if you should add a custom header that has the
same name as one of the internal ones curl would use, your externally set
header will be used instead of the internal one. This allows you to make even
trickier stuff than curl would normally do. You should not replace internally
set headers without knowing perfectly well what you're doing. Remove an
internal header by giving a replacement without content on the right side of
the colon, as in: -H \&"Host:".

curl will make sure that each header you add/replace get sent with the proper
end of line marker, you should thus \fBnot\fP add that as a part of the header
content: do not add newlines or carriage returns they will only mess things up
for you.

See also the \fI-A/--user-agent\fP and \fI-e/--referer\fP options.

This option can be used multiple times to add/replace/remove multiple headers.
.IP "--hostpubmd5"
Pass a string containing 32 hexadecimal digits. The string should be the 128
bit MD5 cheksum of the remote host's public key, curl will refuse the
connection with the host unless the md5sums match. This option is only for SCP
and SFTP transfers. (Added in 7.17.1)
.IP "--ignore-content-length"
(HTTP)
Ignore the Content-Length header. This is particularly useful for servers
running Apache 1.x, which will report incorrect Content-Length for files
larger than 2 gigabytes.
.IP "-i/--include"
(HTTP)
Include the HTTP-header in the output. The HTTP-header includes things
like server-name, date of the document, HTTP-version and more...

If this option is used twice, the second will again disable header include.
.IP "--interface <name>"
Perform an operation using a specified interface. You can enter interface
name, IP address or host name. An example could look like:

 curl --interface eth0:1 http://www.netscape.com/

If this option is used several times, the last one will be used.
.IP "-I/--head"
(HTTP/FTP/FILE)
Fetch the HTTP-header only! HTTP-servers feature the command HEAD
which this uses to get nothing but the header of a document. When used
on a FTP or FILE file, curl displays the file size and last modification
time only.

If this option is used twice, the second will again disable header only.
.IP "-j/--junk-session-cookies"
(HTTP) When curl is told to read cookies from a given file, this option will
make it discard all "session cookies". This will basically have the same effect
as if a new session is started. Typical browsers always discard session
cookies when they're closed down.

If this option is used several times, each occurrence will toggle this on/off.
.IP "-k/--insecure"
(SSL) This option explicitly allows curl to perform "insecure" SSL connections
and transfers. All SSL connections are attempted to be made secure by using
the CA certificate bundle installed by default. This makes all connections
considered "insecure" to fail unless \fI-k/--insecure\fP is used.

See this online resource for further details:
\fBhttp://curl.haxx.se/docs/sslcerts.html\fP

If this option is used twice, the second time will again disable it.
.IP "--key <key>"
(SSL/SSH) Private key file name. Allows you to provide your private key in this