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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
docs/cmdline-opts/Makefile.inc
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@ -1,7 +1,8 @@
# Shared between Makefile.am and CMakeLists.txt
DPAGES = abstract-unix-socket.d anyauth.d append.d basic.d cacert.d capath.d cert.d \
cert-status.d cert-type.d ciphers.d compressed.d config.d \
cert-status.d cert-type.d ciphers.d compressed.d compressed-ssh.d \
config.d \
connect-timeout.d connect-to.d continue-at.d cookie.d cookie-jar.d \
create-dirs.d crlf.d crlfile.d data-ascii.d data-binary.d data.d \
data-raw.d data-urlencode.d delegation.d digest.d disable.d \

6
docs/cmdline-opts/compressed-ssh.d Normal file
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@ -0,0 +1,6 @@
Long: compressed-ssh
Help: Enable SSH compression
Protocols: SCP SFTP
---
Enables built-in SSH compression.
This is a request, not an order; the server may or may not do it.

2
docs/libcurl/curl_easy_setopt.3
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@ -547,6 +547,8 @@ Disable GSS-API delegation. See \fICURLOPT_GSSAPI_DELEGATION(3)\fP
.SH SSH OPTIONS
.IP CURLOPT_SSH_AUTH_TYPES
SSH authentication types. See \fICURLOPT_SSH_AUTH_TYPES(3)\fP
.IP CURLOPT_SSH_COMPRESSION
Enable SSH compression. See \fICURLOPT_SSH_COMPRESSION(3)\fP
.IP CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
MD5 of host's public key. See \fICURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)\fP
.IP CURLOPT_SSH_PUBLIC_KEYFILE

58
docs/libcurl/opts/CURLOPT_SSH_COMPRESSION.3 Normal file
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@ -0,0 +1,58 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
.\" * are also available at https://curl.haxx.se/docs/copyright.html.
.\" *
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
.\" * copies of the Software, and permit persons to whom the Software is
.\" * furnished to do so, under the terms of the COPYING file.
.\" *
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
.\" *
.\" **************************************************************************
.\"
.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), "

1
docs/libcurl/opts/Makefile.inc
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@ -258,6 +258,7 @@ man_MANS = \
CURLOPT_SOCKS5_GSSAPI_NEC.3 \
CURLOPT_SOCKS5_GSSAPI_SERVICE.3 \
CURLOPT_SSH_AUTH_TYPES.3 \
CURLOPT_SSH_COMPRESSION.3 \
CURLOPT_SSH_HOST_PUBLIC_KEY_MD5.3 \
CURLOPT_SSH_KEYDATA.3 \
CURLOPT_SSH_KEYFUNCTION.3 \

1
docs/libcurl/symbols-in-versions
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@ -540,6 +540,7 @@ CURLOPT_SOURCE_QUOTE 7.13.0 - 7.15.5
CURLOPT_SOURCE_URL 7.13.0 - 7.15.5
CURLOPT_SOURCE_USERPWD 7.12.1 - 7.15.5
CURLOPT_SSH_AUTH_TYPES 7.16.1
CURLOPT_SSH_COMPRESSION 7.56.0
CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 7.17.1
CURLOPT_SSH_KEYDATA 7.19.6
CURLOPT_SSH_KEYFUNCTION 7.19.6