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#include "config.h"
#include <assert.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <libgen.h>
#include <limits.h>
#include <grp.h>
#define TEST_GROUP "test/test.group"
static char grfile[] = BASEDIR "/" TEST_GROUP;
#define ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
#define ALIGN(x, a) ALIGN_MASK(x, (typeof(x))(a) - 1)
static int test_getgrent_r(FILE *file, struct group *grp, char *buf,
size_t buflen, struct group **result)
{
char *line, *str, *remain;
int count, index = 0;
int gr_mem_cnt = 0;
*result = NULL;
line = fgets(buf, buflen, file);
if (!line)
return 0;
/* We'll stuff the gr_mem array in the remaining space in the buffer */
remain = buf + ALIGN(line + strlen(line) - buf, sizeof(char *));
grp->gr_mem = (char **)remain;
count = (buf + buflen - remain) / sizeof (char *);
if (!count) {
errno = ERANGE;
return -1;
}
grp->gr_mem[--count] = NULL;
while ((str = strtok(line, ":"))) {
char *ptr;
switch (index++) {
case 0:
grp->gr_name = str;
break;
case 1:
grp->gr_passwd = str;
break;
case 2:
errno = 0;
grp->gr_gid = strtol(str, NULL, 10);
if (errno)
return -1;
break;
case 3:
while ((str = strtok_r(str, ",", &ptr))) {
if (count-- <= 0) {
errno = ERANGE;
return -1;
}
grp->gr_mem[gr_mem_cnt++] = str;
str = NULL;
}
}
line = NULL;
}
*result = grp;
return 0;
}
static int test_getgr_match(struct group *grp, char *buf, size_t buflen,
struct group **result,
int (*match)(const struct group *, const void *),
const void *data)
{
FILE *file;
struct group *_result;
*result = NULL;
file = fopen(grfile, "r");
if (!file) {
errno = EBADF;
return -1;
}
errno = 0;
while (!test_getgrent_r(file, grp, buf, buflen, &_result)) {
if (!_result)
break;
else if (match(grp, data)) {
*result = grp;
break;
}
}
fclose(file);
if (!errno && !*result)
errno = ENOENT;
if (errno)
return -1;
return 0;
}
static int match_name(const struct group *grp, const void *data)
{
const char *name = data;
return !strcmp(grp->gr_name, name);
}
EXPORT
int getgrnam_r(const char *name, struct group *grp, char *buf, size_t buflen,
struct group **result)
{
static size_t last_buflen = -1;
assert(last_buflen == -1 || buflen > last_buflen);
if (buflen < 170000) {
last_buflen = buflen;
*result = NULL;
return ERANGE;
}
last_buflen = -1;
return test_getgr_match(grp, buf, buflen, result, match_name, name);
}
EXPORT
struct group *getgrnam(const char *name)
{
static char buf[16384];
static struct group grp;
struct group *result;
(void) getgrnam_r(name, &grp, buf, sizeof(buf), &result);
return result;
}
static int match_gid(const struct group *grp, const void *data)
{
gid_t gid = *(gid_t *)data;
return grp->gr_gid == gid;
}
EXPORT
int getgrgid_r(gid_t gid, struct group *grp, char *buf, size_t buflen,
struct group **result)
{
return test_getgr_match(grp, buf, buflen, result, match_gid, &gid);
}
EXPORT
struct group *getgrgid(gid_t gid)
{
static char buf[16384];
static struct group grp;
struct group *result;
(void) getgrgid_r(gid, &grp, buf, sizeof(buf), &result);
return result;
}
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