libcurl: add UNIX domain sockets support

The ability to do HTTP requests over a UNIX domain socket has been
requested before, in Apr 2008 [0][1] and Sep 2010 [2]. While a
discussion happened, no patch seems to get through. I decided to give it
a go since I need to test a nginx HTTP server which listens on a UNIX
domain socket.

One patch [3] seems to make it possible to use the
CURLOPT_OPENSOCKETFUNCTION function to gain a UNIX domain socket.
Another person wrote a Go program which can do HTTP over a UNIX socket
for Docker[4] which uses a special URL scheme (though the name contains
cURL, it has no relation to the cURL library).

This patch considers support for UNIX domain sockets at the same level
as HTTP proxies / IPv6, it acts as an intermediate socket provider and
not as a separate protocol. Since this feature affects network
operations, a new feature flag was added ("unix-sockets") with a
corresponding CURL_VERSION_UNIX_SOCKETS macro.

A new CURLOPT_UNIX_SOCKET_PATH option is added and documented. This
option enables UNIX domain sockets support for all requests on the
handle (replacing IP sockets and skipping proxies).

A new configure option (--enable-unix-sockets) and CMake option
(ENABLE_UNIX_SOCKETS) can disable this optional feature. Note that I
deliberately did not mark this feature as advanced, this is a
feature/component that should easily be available.

 [0]: http://curl.haxx.se/mail/lib-2008-04/0279.html
 [1]: http://daniel.haxx.se/blog/2008/04/14/http-over-unix-domain-sockets/
 [2]: http://sourceforge.net/p/curl/feature-requests/53/
 [3]: http://curl.haxx.se/mail/lib-2008-04/0361.html
 [4]: https://github.com/Soulou/curl-unix-socket

Signed-off-by: Peter Wu <peter@lekensteyn.nl>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/curl/curl.h b/include/curl/curl.h
index 5ed4c3ea5..0d2076bd2 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -1619,6 +1619,9 @@ typedef enum {
      this option is used only if SSL_VERIFYPEER is true */
   CINIT(PINNEDPUBLICKEY, OBJECTPOINT, 230),
 
+  /* Path to UNIX domain socket */
+  CINIT(UNIX_SOCKET_PATH, OBJECTPOINT, 231),
+
   CURLOPT_LASTENTRY /* the last unused */
 } CURLoption;
 
@@ -2266,6 +2269,7 @@ typedef struct {
 #define CURL_VERSION_HTTP2        (1<<16) /* HTTP2 support built-in */
 #define CURL_VERSION_GSSAPI       (1<<17) /* Built against a GSS-API library */
 #define CURL_VERSION_KERBEROS5    (1<<18) /* Kerberos V5 auth is supported */
+#define CURL_VERSION_UNIX_SOCKETS (1<<19) /* UNIX domain sockets support */
 
  /*
  * NAME curl_version_info()