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curl/docs/libcurl/opts/CURLOPT_SSH_COMPRESSION.3
Viktor Szakats b7b4dc0d49 ssh: add the ability to enable compression (for SCP/SFTP)
The required low-level logic was already available as part of
`libssh2` (via `LIBSSH2_FLAG_COMPRESS` `libssh2_session_flag()`[1]
option.)

This patch adds the new `libcurl` option `CURLOPT_SSH_COMPRESSION`
(boolean) and the new `curl` command-line option `--compressed-ssh`
to request this `libssh2` feature. To have compression enabled, it
is required that the SSH server supports a (zlib) compatible
compression method and that `libssh2` was built with `zlib` support
enabled.

[1] https://www.libssh2.org/libssh2_session_flag.html

Ref: https://github.com/curl/curl/issues/1732
Closes https://github.com/curl/curl/pull/1735
2017-08-17 03:32:00 -04:00

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2.1 KiB
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.TH CURLOPT_SSH_COMPRESSION 3 "05 Aug 2017" "libcurl 7.56.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_SSH_COMPRESSION \- enables automatic decompression of HTTP downloads
.SH SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_COMPRESSION, long enable);
.SH DESCRIPTION
Pass a long as parameter to enable or disable.
Enables built-in SSH compression.
This is a request, not an order; the server may or may not do it.
.SH DEFAULT
.SH PROTOCOLS
All SSH based protocols: SCP, SFTP
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com");
/* enable built-in compression */
curl_easy_setopt(curl, CURLOPT_SSH_COMPRESSION, 1L);
/* Perform the request */
curl_easy_perform(curl);
}
.fi
.SH AVAILABILITY
Added in 7.56.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH "SEE ALSO"
.BR CURLOPT_ACCEPT_ENCODING "(3), " CURLOPT_TRANSFER_ENCODING "(3), "