| 1 | /*
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| 2 | * Copyright (c) 1997 - 1999 Kungliga Tekniska Högskolan
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| 3 | * (Royal Institute of Technology, Stockholm, Sweden).
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | *
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| 17 | * 3. Neither the name of the Institute nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | */
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| 33 |
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| 34 | #include <config.h>
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| 35 |
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| 36 | #include "roken.h"
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| 37 |
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| 38 | /*
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| 39 | * Try to return what should be considered the default username or
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| 40 | * NULL if we can't guess at all.
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| 41 | */
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| 42 |
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| 43 | ROKEN_LIB_FUNCTION const char * ROKEN_LIB_CALL
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| 44 | get_default_username (void)
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| 45 | {
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| 46 | const char *user;
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| 47 |
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| 48 | user = getenv ("USER");
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| 49 | if (user == NULL)
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| 50 | user = getenv ("LOGNAME");
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| 51 | if (user == NULL)
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| 52 | user = getenv ("USERNAME");
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| 53 |
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| 54 | #if defined(HAVE_GETLOGIN) && !defined(POSIX_GETLOGIN)
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| 55 | if (user == NULL) {
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| 56 | user = (const char *)getlogin ();
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| 57 | if (user != NULL)
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| 58 | return user;
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| 59 | }
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| 60 | #endif
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| 61 | #ifdef HAVE_PWD_H
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| 62 | {
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| 63 | uid_t uid = getuid ();
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| 64 | struct passwd *pwd;
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| 65 |
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| 66 | if (user != NULL) {
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| 67 | pwd = k_getpwnam (user);
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| 68 | if (pwd != NULL && pwd->pw_uid == uid)
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| 69 | return user;
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| 70 | }
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| 71 | pwd = k_getpwuid (uid);
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| 72 | if (pwd != NULL)
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| 73 | return pwd->pw_name;
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| 74 | }
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| 75 | #endif
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| 76 | #ifdef _WIN32
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| 77 | /* TODO: We can call GetUserNameEx() and figure out a
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| 78 | username. However, callers do not free the return value of this
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| 79 | function. */
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| 80 | #endif
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| 81 |
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| 82 | return user;
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| 83 | }
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