Add proxy_cacert support

This completes the bindings for proxy SSL options and fixes #160.

curl-sys/lib.rs

@@ -577,6 +577,7 @@ pub const CURLOPT_SSL_OPTIONS: CURLoption = CURLOPTTYPE_LONG + 216;
 pub const CURLOPT_UNIX_SOCKET_PATH: CURLoption = CURLOPTTYPE_OBJECTPOINT + 231;
 pub const CURLOPT_PIPEWAIT: CURLoption = CURLOPTTYPE_LONG + 237;
 pub const CURLOPT_PROXY_CAINFO: CURLoption = CURLOPTTYPE_OBJECTPOINT + 246;
+pub const CURLOPT_PROXY_CAPATH: CURLoption = CURLOPTTYPE_OBJECTPOINT + 247;
 pub const CURLOPT_PROXY_SSLCERT: CURLoption = CURLOPTTYPE_OBJECTPOINT + 254;
 pub const CURLOPT_PROXY_SSLKEY: CURLoption = CURLOPTTYPE_OBJECTPOINT + 256;
 

src/easy/handle.rs

@@ -568,6 +568,11 @@ impl Easy {
         self.inner.proxy_cainfo(cainfo)
     }
 
+    /// Same as [`Easy2::proxy_capath`](struct.Easy2.html#method.proxy_capath)
+    pub fn proxy_capath<P: AsRef<Path>>(&mut self, path: P) -> Result<(), Error> {
+        self.inner.proxy_capath(path)
+    }
+
     /// Same as [`Easy2::proxy_sslcert`](struct.Easy2.html#method.proxy_sslcert)
     pub fn proxy_sslcert(&mut self, sslcert: &str) -> Result<(), Error> {
         self.inner.proxy_sslcert(sslcert)

src/easy/handler.rs

@@ -889,6 +889,19 @@ impl<H> Easy2<H> {
         self.setopt_str(curl_sys::CURLOPT_PROXY_CAINFO, &cainfo)
     }
 
+    /// Specify a directory holding proxy CA certificates for proxy.
+    ///
+    /// The specified directory should hold multiple CA certificates to verify
+    /// the HTTPS proxy with. If libcurl is built against OpenSSL, the
+    /// certificate directory must be prepared using the OpenSSL `c_rehash`
+    /// utility.
+    ///
+    /// By default this value is not set and corresponds to
+    /// `CURLOPT_PROXY_CAPATH`.
+    pub fn proxy_capath<P: AsRef<Path>>(&mut self, path: P) -> Result<(), Error> {
+        self.setopt_path(curl_sys::CURLOPT_PROXY_CAPATH, path.as_ref())
+    }
+
     /// Set client certificate for proxy
     ///
     /// By default this value is not set and corresponds to `CURLOPT_PROXY_SSLCERT`.