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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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7
lib/ssh.c
View file

@ -2942,6 +2942,13 @@ static CURLcode ssh_connect(struct connectdata *conn, bool *done)
return CURLE_FAILED_INIT;
}
if(data->set.ssh_compression) {
#if LIBSSH2_VERSION_NUM >= 0x010208
if(libssh2_session_flag(ssh->ssh_session, LIBSSH2_FLAG_COMPRESS, 1) < 0)
#endif
infof(data, "Failed to enable compression for ssh session\n");
}
#ifdef HAVE_LIBSSH2_KNOWNHOST_API
if(data->set.str[STRING_SSH_KNOWNHOSTS]) {
int rc;