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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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4
src/tool_getparam.c
View file

@ -188,6 +188,7 @@ static const struct LongShort aliases[]= {
{"$W", "abstract-unix-socket", ARG_STRING},
{"$X", "tls-max", ARG_STRING},
{"$Y", "suppress-connect-headers", ARG_BOOL},
{"$Z", "compressed-ssh", ARG_BOOL},
{"0", "http1.0", ARG_NONE},
{"01", "http1.1", ARG_NONE},
{"02", "http2", ARG_NONE},
@ -1076,6 +1077,9 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
case 'Y': /* --suppress-connect-headers */
config->suppress_connect_headers = toggle;
break;
case 'Z': /* --compressed-ssh */
config->ssh_compression = toggle;
break;
}
break;
case '#': /* --progress-bar */