66 lines
1.2 KiB
C
66 lines
1.2 KiB
C
/*
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* check_user_name(), check_group_name() - check the new user/group
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* name for validity; return value: 1 - OK, 0 - bad name
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*/
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#include <config.h>
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#ident "$Id$"
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#include <ctype.h>
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#include "defines.h"
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#include "chkname.h"
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#if HAVE_UTMPX_H
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#include <utmpx.h>
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#else
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#include <utmp.h>
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#endif
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static int good_name (const char *name)
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{
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/*
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* User/group names must match [a-z_][a-z0-9_-]*[$]
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*/
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if (!*name || !((*name >= 'a' && *name <= 'z') || *name == '_'))
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return 0;
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while (*++name) {
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if (!((*name >= 'a' && *name <= 'z') ||
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(*name >= '0' && *name <= '9') ||
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*name == '_' || *name == '-' ||
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(*name == '$' && *(name + 1) == '\0')))
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return 0;
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}
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return 1;
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}
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int check_user_name (const char *name)
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{
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#if HAVE_UTMPX_H
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struct utmpx ut;
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#else
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struct utmp ut;
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#endif
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/*
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* User names are limited by whatever utmp can
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* handle (usually max 8 characters).
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*/
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if (strlen (name) > sizeof (ut.ut_user))
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return 0;
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return good_name (name);
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}
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int check_group_name (const char *name)
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{
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/*
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* Arbitrary limit for group names - max 16
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* characters (same as on HP-UX 10).
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*/
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if (strlen (name) > 16)
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return 0;
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return good_name (name);
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}
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