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82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "setup.h"
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include "curl_gethostname.h"
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/*
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* Curl_gethostname() is a wrapper around gethostname() which allows
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* overriding the host name that the function would normally return.
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* This capability is used by the test suite to verify exact matching
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* of NTLM authentication, which exercises libcurl's MD4 and DES code.
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*
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* For libcurl debug enabled builds host name overriding takes place
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* when environment variable CURL_GETHOSTNAME is set, using the value
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* held by the variable to override returned host name.
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*
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* For libcurl shared library release builds the test suite preloads
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* another shared library named libhostname using the LD_PRELOAD
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* mechanism which intercepts, and might override, the gethostname()
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* function call. In this case a given platform must support the
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* LD_PRELOAD mechanism and additionally have environment variable
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* CURL_GETHOSTNAME set in order to override the returned host name.
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*
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* For libcurl static library release builds no overriding takes place.
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*/
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int Curl_gethostname(char *name, GETHOSTNAME_TYPE_ARG2 namelen) {
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#ifndef HAVE_GETHOSTNAME
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/* Allow compilation and return failure when unavailable */
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(void) name;
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(void) namelen;
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return -1;
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#else
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#ifdef DEBUGBUILD
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/* Override host name when environment variable CURL_GETHOSTNAME is set */
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const char *force_hostname = getenv("CURL_GETHOSTNAME");
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if(force_hostname) {
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strncpy(name, force_hostname, namelen);
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name[namelen-1] = '\0';
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return 0;
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}
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#endif /* DEBUGBUILD */
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/* The call to system's gethostname() might get intercepted by the
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libhostname library when libcurl is built as a non-debug shared
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library when running the test suite. */
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return gethostname(name, namelen);
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#endif
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}
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