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Annotation of embedaddon/curl/lib/curl_gethostname.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  *
        !            10:  * This software is licensed as described in the file COPYING, which
        !            11:  * you should have received as part of this distribution. The terms
        !            12:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            13:  *
        !            14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15:  * copies of the Software, and permit persons to whom the Software is
        !            16:  * furnished to do so, under the terms of the COPYING file.
        !            17:  *
        !            18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19:  * KIND, either express or implied.
        !            20:  *
        !            21:  ***************************************************************************/
        !            22: 
        !            23: #include "curl_setup.h"
        !            24: 
        !            25: #include "curl_gethostname.h"
        !            26: 
        !            27: /*
        !            28:  * Curl_gethostname() is a wrapper around gethostname() which allows
        !            29:  * overriding the host name that the function would normally return.
        !            30:  * This capability is used by the test suite to verify exact matching
        !            31:  * of NTLM authentication, which exercises libcurl's MD4 and DES code
        !            32:  * as well as by the SMTP module when a hostname is not provided.
        !            33:  *
        !            34:  * For libcurl debug enabled builds host name overriding takes place
        !            35:  * when environment variable CURL_GETHOSTNAME is set, using the value
        !            36:  * held by the variable to override returned host name.
        !            37:  *
        !            38:  * Note: The function always returns the un-qualified hostname rather
        !            39:  * than being provider dependent.
        !            40:  *
        !            41:  * For libcurl shared library release builds the test suite preloads
        !            42:  * another shared library named libhostname using the LD_PRELOAD
        !            43:  * mechanism which intercepts, and might override, the gethostname()
        !            44:  * function call. In this case a given platform must support the
        !            45:  * LD_PRELOAD mechanism and additionally have environment variable
        !            46:  * CURL_GETHOSTNAME set in order to override the returned host name.
        !            47:  *
        !            48:  * For libcurl static library release builds no overriding takes place.
        !            49:  */
        !            50: 
        !            51: int Curl_gethostname(char *name, GETHOSTNAME_TYPE_ARG2 namelen)
        !            52: {
        !            53: #ifndef HAVE_GETHOSTNAME
        !            54: 
        !            55:   /* Allow compilation and return failure when unavailable */
        !            56:   (void) name;
        !            57:   (void) namelen;
        !            58:   return -1;
        !            59: 
        !            60: #else
        !            61:   int err;
        !            62:   char *dot;
        !            63: 
        !            64: #ifdef DEBUGBUILD
        !            65: 
        !            66:   /* Override host name when environment variable CURL_GETHOSTNAME is set */
        !            67:   const char *force_hostname = getenv("CURL_GETHOSTNAME");
        !            68:   if(force_hostname) {
        !            69:     strncpy(name, force_hostname, namelen);
        !            70:     err = 0;
        !            71:   }
        !            72:   else {
        !            73:     name[0] = '\0';
        !            74:     err = gethostname(name, namelen);
        !            75:   }
        !            76: 
        !            77: #else /* DEBUGBUILD */
        !            78: 
        !            79:   /* The call to system's gethostname() might get intercepted by the
        !            80:      libhostname library when libcurl is built as a non-debug shared
        !            81:      library when running the test suite. */
        !            82:   name[0] = '\0';
        !            83:   err = gethostname(name, namelen);
        !            84: 
        !            85: #endif
        !            86: 
        !            87:   name[namelen - 1] = '\0';
        !            88: 
        !            89:   if(err)
        !            90:     return err;
        !            91: 
        !            92:   /* Truncate domain, leave only machine name */
        !            93:   dot = strchr(name, '.');
        !            94:   if(dot)
        !            95:     *dot = '\0';
        !            96: 
        !            97:   return 0;
        !            98: #endif
        !            99: 
        !           100: }