74 lines
1.2 KiB
C
74 lines
1.2 KiB
C
/*
|
|
* check_user_name(), check_group_name() - check the new user/group
|
|
* name for validity; return value: 1 - OK, 0 - bad name
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include "rcsid.h"
|
|
RCSID("$Id: chkname.c,v 1.4 1998/04/16 19:57:43 marekm Exp $")
|
|
|
|
#include <ctype.h>
|
|
#include "defines.h"
|
|
#include "chkname.h"
|
|
|
|
#if HAVE_UTMPX_H
|
|
#include <utmpx.h>
|
|
#else
|
|
#include <utmp.h>
|
|
#endif
|
|
|
|
static int
|
|
good_name(const char *name)
|
|
{
|
|
/*
|
|
* User/group names must start with a letter, and may not
|
|
* contain colons, commas, newlines (used in passwd/group
|
|
* files...) or any non-printable characters.
|
|
*/
|
|
if (!*name || !isalpha(*name))
|
|
return 0;
|
|
|
|
while (*name) {
|
|
if (*name == ':' || *name == ',' ||
|
|
*name == '\n' || !isprint(*name))
|
|
return 0;
|
|
|
|
name++;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
check_user_name(const char *name)
|
|
{
|
|
#if HAVE_UTMPX_H
|
|
struct utmpx ut;
|
|
#else
|
|
struct utmp ut;
|
|
#endif
|
|
|
|
/*
|
|
* User names are limited by whatever utmp can
|
|
* handle (usually max 8 characters).
|
|
*/
|
|
if (strlen(name) > sizeof(ut.ut_user))
|
|
return 0;
|
|
|
|
return good_name(name);
|
|
}
|
|
|
|
int
|
|
check_group_name(const char *name)
|
|
{
|
|
/*
|
|
* Arbitrary limit for group names - max 16
|
|
* characters (same as on HP-UX 10).
|
|
*/
|
|
if (strlen(name) > 16)
|
|
return 0;
|
|
|
|
return good_name(name);
|
|
}
|