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+#ifndef HEADER_CURL_SOCKS_H
+#define HEADER_CURL_SOCKS_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2021, Daniel Stenberg, <[email protected]>, 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.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.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#ifdef CURL_DISABLE_PROXY
+#define Curl_SOCKS4(a,b,c,d,e) CURLE_NOT_BUILT_IN
+#define Curl_SOCKS5(a,b,c,d,e,f) CURLE_NOT_BUILT_IN
+#define Curl_SOCKS_getsock(x,y,z) 0
+#else
+/*
+ * Helper read-from-socket functions. Does the same as Curl_read() but it
+ * blocks until all bytes amount of buffersize will be read. No more, no less.
+ *
+ * This is STUPID BLOCKING behavior
+ */
+int Curl_blockread_all(struct Curl_easy *data,
+                       curl_socket_t sockfd,
+                       char *buf,
+                       ssize_t buffersize,
+                       ssize_t *n);
+
+int Curl_SOCKS_getsock(struct connectdata *conn,
+                       curl_socket_t *sock,
+                       int sockindex);
+/*
+ * This function logs in to a SOCKS4(a) proxy and sends the specifics to the
+ * final destination server.
+ */
+CURLproxycode Curl_SOCKS4(const char *proxy_name,
+                          const char *hostname,
+                          int remote_port,
+                          int sockindex,
+                          struct Curl_easy *data,
+                          bool *done);
+
+/*
+ * This function logs in to a SOCKS5 proxy and sends the specifics to the
+ * final destination server.
+ */
+CURLproxycode Curl_SOCKS5(const char *proxy_name,
+                          const char *proxy_password,
+                          const char *hostname,
+                          int remote_port,
+                          int sockindex,
+                          struct Curl_easy *data,
+                          bool *done);
+
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+/*
+ * This function handles the SOCKS5 GSS-API negotiation and initialisation
+ */
+CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
+                                      struct Curl_easy *data);
+#endif
+
+#endif /* CURL_DISABLE_PROXY */
+
+#endif  /* HEADER_CURL_SOCKS_H */