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ssh: add the ability to enable compression (for SCP/SFTP)

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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
This commit is contained in:
Viktor Szakats 2017-08-05 09:26:04 +00:00 • committed by Jay Satiro
parent d18941ea17
commit b7b4dc0d49
17 changed files with 140 additions and 2 deletions
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3
lib/url.c
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@ -2936,6 +2936,9 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
case CURLOPT_SUPPRESS_CONNECT_HEADERS:
data->set.suppress_connect_headers = (0 != va_arg(param, long))?TRUE:FALSE;
break;
case CURLOPT_SSH_COMPRESSION:
data->set.ssh_compression = (0 != va_arg(param, long))?TRUE:FALSE;
break;
default:
/* unknown tag and its companion, just ignore: */
result = CURLE_UNKNOWN_OPTION;