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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 20:46:53 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 20:46:53 +0000 |
commit | 19da58be2d9359a9641381feb559be0b918ef710 (patch) | |
tree | 109724175f07436696f51b14b5abbd3f4d704d6d /libmisc/myname.c | |
parent | Initial commit. (diff) | |
download | shadow-19da58be2d9359a9641381feb559be0b918ef710.tar.xz shadow-19da58be2d9359a9641381feb559be0b918ef710.zip |
Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libmisc/myname.c')
-rw-r--r-- | libmisc/myname.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/libmisc/myname.c b/libmisc/myname.c new file mode 100644 index 0000000..1b02617 --- /dev/null +++ b/libmisc/myname.c @@ -0,0 +1,49 @@ +/* + * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz + * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko + * SPDX-FileCopyrightText: 2007 - 2009, Nicolas François + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +/* + * myname.c - determine the current username and get the passwd entry + * + */ + +#include <config.h> + +#ident "$Id$" + +#include "defines.h" +#include <pwd.h> +#include "prototypes.h" +/*@null@*/ /*@only@*/struct passwd *get_my_pwent (void) +{ + struct passwd *pw; + const char *cp = getlogin (); + uid_t ruid = getuid (); + + /* + * Try getlogin() first - if it fails or returns a non-existent + * username, or a username which doesn't match the real UID, fall + * back to getpwuid(getuid()). This should work reasonably with + * usernames longer than the utmp limit (8 characters), as well as + * shared UIDs - but not both at the same time... + * + * XXX - when running from su, will return the current user (not + * the original user, like getlogin() does). Does this matter? + */ + if ((NULL != cp) && ('\0' != *cp)) { + pw = xgetpwnam (cp); + if ((NULL != pw) && (pw->pw_uid == ruid)) { + return pw; + } + if (NULL != pw) { + pw_free (pw); + } + } + + return xgetpwuid (ruid); +} + |