| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) Daniel Stenberg, <[email protected]>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | * SPDX-License-Identifier: curl
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | #include "curl_setup.h"
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| 26 |
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| 27 | #include "curl_gethostname.h"
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| 28 |
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| 29 | /*
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| 30 | * Curl_gethostname() is a wrapper around gethostname() which allows
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| 31 | * overriding the hostname that the function would normally return.
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| 32 | * This capability is used by the test suite to verify exact matching
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| 33 | * of NTLM authentication, which exercises libcurl's MD4 and DES code
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| 34 | * as well as by the SMTP module when a hostname is not provided.
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| 35 | *
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| 36 | * For libcurl debug enabled builds hostname overriding takes place
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| 37 | * when environment variable CURL_GETHOSTNAME is set, using the value
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| 38 | * held by the variable to override returned hostname.
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| 39 | *
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| 40 | * Note: The function always returns the un-qualified hostname rather
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| 41 | * than being provider dependent.
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| 42 | */
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| 43 |
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| 44 | int Curl_gethostname(char * const name, GETHOSTNAME_TYPE_ARG2 namelen)
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| 45 | {
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| 46 | #ifndef HAVE_GETHOSTNAME
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| 47 |
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| 48 | /* Allow compilation and return failure when unavailable */
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| 49 | (void) name;
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| 50 | (void) namelen;
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| 51 | return -1;
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| 52 |
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| 53 | #else
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| 54 | int err;
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| 55 | char *dot;
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| 56 |
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| 57 | #ifdef DEBUGBUILD
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| 58 |
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| 59 | /* Override hostname when environment variable CURL_GETHOSTNAME is set */
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| 60 | const char *force_hostname = getenv("CURL_GETHOSTNAME");
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| 61 | if(force_hostname) {
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| 62 | if(strlen(force_hostname) < (size_t)namelen)
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| 63 | strcpy(name, force_hostname);
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| 64 | else
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| 65 | return 1; /* can't do it */
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| 66 | err = 0;
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| 67 | }
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| 68 | else {
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| 69 | name[0] = '\0';
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| 70 | err = gethostname(name, namelen);
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| 71 | }
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| 72 |
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| 73 | #else /* DEBUGBUILD */
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| 74 |
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| 75 | name[0] = '\0';
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| 76 | err = gethostname(name, namelen);
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| 77 |
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| 78 | #endif
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| 79 |
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| 80 | name[namelen - 1] = '\0';
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| 81 |
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| 82 | if(err)
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| 83 | return err;
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| 84 |
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| 85 | /* Truncate domain, leave only machine name */
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| 86 | dot = strchr(name, '.');
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| 87 | if(dot)
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| 88 | *dot = '\0';
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| 89 |
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| 90 | return 0;
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| 91 | #endif
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| 92 |
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| 93 | }
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