Coverage Report

Created: 2023-03-26 06:28

/src/httpd/srclib/apr/file_io/unix/tempdir.c
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/* Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements.  See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License.  You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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#include "apr_private.h"
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#include "apr_file_io.h"
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#include "apr_strings.h"
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#include "apr_env.h"
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/* Try to open a temporary file in the temporary dir, write to it,
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   and then close it. */
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static int test_tempdir(const char *temp_dir, apr_pool_t *p)
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0
{
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0
    apr_file_t *dummy_file;
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0
    char *path = apr_pstrcat(p, temp_dir, "/apr-tmp.XXXXXX", NULL);
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    if (apr_file_mktemp(&dummy_file, path, 0, p) == APR_SUCCESS) {
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        if (apr_file_putc('!', dummy_file) == APR_SUCCESS) {
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            if (apr_file_close(dummy_file) == APR_SUCCESS) {
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                return 1;
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0
            }
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        }
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    }
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    return 0;
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0
}
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APR_DECLARE(apr_status_t) apr_temp_dir_get(const char **temp_dir,
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                                           apr_pool_t *p)
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0
{
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0
    apr_status_t apr_err;
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    const char *try_dirs[] = { "/tmp", "/usr/tmp", "/var/tmp" };
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0
    const char *try_envs[] = { "TMPDIR", "TMP", "TEMP"};
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    const char *dir;
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    char *cwd;
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    int i;
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    /* Our goal is to find a temporary directory suitable for writing
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       into.
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       Here's the order in which we'll try various paths:
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          $TMPDIR
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          $TMP
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          $TEMP
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          "C:\TEMP"     (windows only)
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          "SYS:\TMP"    (netware only)
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          "/tmp"
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          "/var/tmp"
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          "/usr/tmp"
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          P_tmpdir      (POSIX define)
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          `pwd`
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       NOTE: This algorithm is basically the same one used by Python
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       2.2's tempfile.py module.  */
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    /* Try the environment first. */
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0
    for (i = 0; i < (sizeof(try_envs) / sizeof(const char *)); i++) {
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        char *value;
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        apr_err = apr_env_get(&value, try_envs[i], p);
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        if ((apr_err == APR_SUCCESS) && value) {
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            apr_size_t len = strlen(value);
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            if (len && (len < APR_PATH_MAX) && test_tempdir(value, p)) {
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                dir = value;
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                goto end;
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0
            }
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        }
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    }
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#ifdef WIN32
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    /* Next, on Win32, try the C:\TEMP directory. */
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    if (test_tempdir("C:\\TEMP", p)) {
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        dir = "C:\\TEMP";
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        goto end;
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    }
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#endif
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#ifdef NETWARE
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    /* Next, on NetWare, try the SYS:/TMP directory. */
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    if (test_tempdir("SYS:/TMP", p)) {
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        dir = "SYS:/TMP";
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        goto end;
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    }
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#endif
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    /* Next, try a set of hard-coded paths. */
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0
    for (i = 0; i < (sizeof(try_dirs) / sizeof(const char *)); i++) {
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        if (test_tempdir(try_dirs[i], p)) {
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            dir = try_dirs[i];
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            goto end;
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        }
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    }
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#ifdef P_tmpdir
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    /*
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     * If we have it, use the POSIX definition of where
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     * the tmpdir should be
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     */
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0
    if (test_tempdir(P_tmpdir, p)) {
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0
        dir = P_tmpdir;
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        goto end;
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0
    }
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#endif
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    /* Finally, try the current working directory. */
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    if (APR_SUCCESS == apr_filepath_get(&cwd, APR_FILEPATH_NATIVE, p)) {
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        if (test_tempdir(cwd, p)) {
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            dir = cwd;
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      goto end;
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        }
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    }
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    /* We didn't find a suitable temp dir anywhere */
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    return APR_EGENERAL;
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end:
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    *temp_dir = apr_pstrdup(p, dir);
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    return APR_SUCCESS;
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0
}