105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/*
|
|
* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
|
|
* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
|
|
* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
|
|
* SPDX-FileCopyrightText: 2008 , Nicolas François
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#ident "$Id$"
|
|
|
|
#include <sys/types.h>
|
|
#include "defines.h"
|
|
#include <stdio.h>
|
|
#include <pwd.h>
|
|
#include "prototypes.h"
|
|
|
|
#define NFIELDS 7
|
|
|
|
/*
|
|
* sgetpwent - convert a string to a (struct passwd)
|
|
*
|
|
* sgetpwent() parses a string into the parts required for a password
|
|
* structure. Strict checking is made for the UID and GID fields and
|
|
* presence of the correct number of colons. Any failing tests result
|
|
* in a NULL pointer being returned.
|
|
*
|
|
* NOTE: This function uses hard-coded string scanning functions for
|
|
* performance reasons. I am going to come up with some conditional
|
|
* compilation glarp to improve on this in the future.
|
|
*/
|
|
struct passwd *sgetpwent (const char *buf)
|
|
{
|
|
static struct passwd pwent;
|
|
static char pwdbuf[1024];
|
|
register int i;
|
|
register char *cp;
|
|
char *fields[NFIELDS];
|
|
|
|
/*
|
|
* Copy the string to a static buffer so the pointers into
|
|
* the password structure remain valid.
|
|
*/
|
|
|
|
if (strlen (buf) >= sizeof pwdbuf)
|
|
return 0; /* fail if too long */
|
|
strcpy (pwdbuf, buf);
|
|
|
|
/*
|
|
* Save a pointer to the start of each colon separated
|
|
* field. The fields are converted into NUL terminated strings.
|
|
*/
|
|
|
|
for (cp = pwdbuf, i = 0; (i < NFIELDS) && (NULL != cp); i++) {
|
|
fields[i] = cp;
|
|
while (('\0' != *cp) && (':' != *cp)) {
|
|
cp++;
|
|
}
|
|
|
|
if ('\0' != *cp) {
|
|
*cp = '\0';
|
|
cp++;
|
|
} else {
|
|
cp = NULL;
|
|
}
|
|
}
|
|
|
|
/* something at the end, columns over shot */
|
|
if ( cp != NULL ) {
|
|
return( NULL );
|
|
}
|
|
|
|
/*
|
|
* There must be exactly NFIELDS colon separated fields or
|
|
* the entry is invalid. Also, the UID and GID must be non-blank.
|
|
*/
|
|
|
|
if (i != NFIELDS || *fields[2] == '\0' || *fields[3] == '\0')
|
|
return NULL;
|
|
|
|
/*
|
|
* Each of the fields is converted the appropriate data type
|
|
* and the result assigned to the password structure. If the
|
|
* UID or GID does not convert to an integer value, a NULL
|
|
* pointer is returned.
|
|
*/
|
|
|
|
pwent.pw_name = fields[0];
|
|
pwent.pw_passwd = fields[1];
|
|
if (get_uid (fields[2], &pwent.pw_uid) == 0) {
|
|
return NULL;
|
|
}
|
|
if (get_gid (fields[3], &pwent.pw_gid) == 0) {
|
|
return NULL;
|
|
}
|
|
pwent.pw_gecos = fields[4];
|
|
pwent.pw_dir = fields[5];
|
|
pwent.pw_shell = fields[6];
|
|
|
|
return &pwent;
|
|
}
|
|
|