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/*
* POSIX 1003.1b - 9.2.1 - Group Database Access Routines
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <stdio.h>
#include <sys/types.h>
#include <grp.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
static struct group gr_group; /* password structure */
static FILE *group_fp;
/*
* The size of these buffers is arbitrary and there is no provision
* to protect any of them from overflowing. The scanf patterns
* need to be changed to prevent overflowing. In addition,
* the limits on these needs to be examined.
*/
static char groupname[8];
static char password[1024];
static char groups[1024];
static char *gr_mem[16] = { } ;
extern void init_etc_passwd_group(void);
int getgrnam_r(
const char *name,
struct group *grp,
char *buffer,
size_t bufsize,
struct group **result
)
{
FILE *fp;
init_etc_passwd_group();
if ((fp = fopen ("/etc/group", "r")) == NULL) {
errno = EINVAL;
return -1;
}
while (fgets (buffer, bufsize, fp)) {
sscanf (buffer, "%[^:]:%[^:]:%d:%s\n",
groupname, password, (int *) &grp->gr_gid,
groups);
grp->gr_name = groupname;
grp->gr_passwd = password;
grp->gr_mem = gr_mem ;
if (!strcmp (groupname, name)) {
fclose (fp);
*result = grp;
return 0;
}
}
fclose (fp);
errno = EINVAL;
return -1;
}
struct group *getgrnam(
const char *name
)
{
char buf[1024];
struct group *g;
if ( getgrnam_r( name, &gr_group, buf, 1024, &g ) )
return NULL;
return g;
}
int getgrgid_r(
gid_t gid,
struct group *grp,
char *buffer,
size_t bufsize,
struct group **result
)
{
FILE *fp;
init_etc_passwd_group();
if ((fp = fopen ("/etc/group", "r")) == NULL) {
errno = EINVAL;
return -1;
}
while (fgets (buffer, bufsize, fp)) {
sscanf (buffer, "%[^:]:%[^:]:%d:%s\n",
groupname, password, (int *) &gr_group.gr_gid,
groups);
gr_group.gr_name = groupname;
gr_group.gr_passwd = password;
gr_group.gr_mem = gr_mem ;
if (gid == gr_group.gr_gid) {
fclose (fp);
*result = grp;
return 0;
}
}
fclose (fp);
errno = EINVAL;
return -1;
}
struct group *getgrgid (
gid_t gid
)
{
char buf[1024];
struct group *g;
if ( getgrgid_r( gid, &gr_group, buf, 1024, &g ) )
return NULL;
return g;
}
struct group *getgrent( void )
{
char buf[1024];
if (group_fp == NULL)
return NULL;
if (fgets (buf, sizeof (buf), group_fp) == NULL)
return NULL;
sscanf (buf, "%[^:]:%[^:]:%d:%s\n",
groupname, password, (int *) &gr_group.gr_gid,
groups);
gr_group.gr_name = groupname;
gr_group.gr_passwd = password;
gr_group.gr_mem = gr_mem ;
return &gr_group;
}
void
setgrent ()
{
init_etc_passwd_group();
if (group_fp != NULL)
fclose (group_fp);
group_fp = fopen ("/etc/group", "r");
}
void
endgrent ()
{
if (group_fp != NULL)
fclose (group_fp);
}
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