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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.