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344a177aac
wolfssl: use strcpy() as the target buffer is > 40 bytes gethostname: return failure if the buffer is too small instead Closes #14830
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/***************************************************************************
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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) 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 https://curl.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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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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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 hostname 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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* as well as by the SMTP module when a hostname is not provided.
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*
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* For libcurl debug enabled builds hostname 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 hostname.
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*
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* Note: The function always returns the un-qualified hostname rather
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* than being provider dependent.
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*/
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int Curl_gethostname(char * const name, GETHOSTNAME_TYPE_ARG2 namelen)
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{
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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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int err;
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char *dot;
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#ifdef DEBUGBUILD
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/* Override hostname 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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if(strlen(force_hostname) < (size_t)namelen)
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strcpy(name, force_hostname);
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else
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return 1; /* can't do it */
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err = 0;
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}
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else {
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name[0] = '\0';
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err = gethostname(name, namelen);
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}
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#else /* DEBUGBUILD */
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name[0] = '\0';
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err = gethostname(name, namelen);
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#endif
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name[namelen - 1] = '\0';
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if(err)
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return err;
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/* Truncate domain, leave only machine name */
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dot = strchr(name, '.');
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if(dot)
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*dot = '\0';
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return 0;
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#endif
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}
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