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/* Test of getting user name.
Copyright (C) 2010-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible and Paul Eggert. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if !(defined _WIN32 && !defined __CYGWIN__)
# include <pwd.h>
#endif
#include <sys/stat.h>
#include <sys/types.h>
#include "macros.h"
static void
test_getlogin_result (const char *buf, int err)
{
if (err != 0)
{
if (err == ENOENT)
{
/* This can happen on GNU/Linux. */
fprintf (stderr, "Skipping test: no entry in utmp file.\n");
exit (77);
}
ASSERT (err == ENOTTY
|| err == EINVAL /* seen on Linux/SPARC */
|| err == ENXIO
);
#if defined __linux__
/* On Linux, it is possible to set up a chroot environment in such a way
that stdin is connected to a tty and nervertheless /proc/self/loginuid
contains the value (uid_t)(-1). In this situation, getlogin() and
getlogin_r() fail; this is expected. */
bool loginuid_undefined = false;
/* Does the special file /proc/self/loginuid contain the value
(uid_t)(-1)? */
FILE *fp = fopen ("/proc/self/loginuid", "r");
if (fp != NULL)
{
char fread_buf[21];
size_t n = fread (fread_buf, 1, sizeof fread_buf, fp);
if (n > 0 && n < sizeof fread_buf)
{
fread_buf[n] = '\0';
errno = 0;
char *endptr;
unsigned long value = strtoul (fread_buf, &endptr, 10);
if (*endptr == '\0' && errno == 0)
loginuid_undefined = ((uid_t) value == (uid_t)(-1));
}
fclose (fp);
}
if (loginuid_undefined)
{
fprintf (stderr, "Skipping test: loginuid is undefined.\n");
exit (77);
}
#endif
/* It fails when stdin is not connected to a tty. */
#if !defined __hpux /* On HP-UX 11.11 it fails anyway. */
ASSERT (! isatty (0));
#endif
fprintf (stderr, "Skipping test: stdin is not a tty.\n");
exit (77);
}
/* Compare against the value from the environment. */
#if !(defined _WIN32 && !defined __CYGWIN__)
/* Unix platform */
{
struct stat stat_buf;
struct passwd *pwd;
if (!isatty (STDIN_FILENO))
{
/* We get here, for example, when running under 'nohup' or as part of a
non-interactive ssh command. */
fprintf (stderr, "Skipping test: stdin is not a tty.\n");
exit (77);
}
ASSERT (fstat (STDIN_FILENO, &stat_buf) == 0);
pwd = getpwnam (buf);
if (! pwd)
{
fprintf (stderr, "Skipping test: %s: no such user\n", buf);
exit (77);
}
ASSERT (pwd->pw_uid == stat_buf.st_uid);
}
#endif
#if defined _WIN32 && !defined __CYGWIN__
/* Native Windows platform.
Note: This test would fail on Cygwin in an ssh session, because sshd
sets USERNAME=SYSTEM. */
{
const char *name = getenv ("USERNAME");
if (name != NULL && name[0] != '\0')
ASSERT (strcmp (buf, name) == 0);
}
#endif
}
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