82 lines
1.7 KiB
C
82 lines
1.7 KiB
C
#define _GNU_SOURCE
|
|
#include "pwf.h"
|
|
#include <grp.h>
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <byteswap.h>
|
|
#include <errno.h>
|
|
#include "nscd.h"
|
|
|
|
int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
|
|
{
|
|
int rv, nlim, ret = -1;
|
|
ssize_t i, n = 1;
|
|
struct group gr;
|
|
struct group *res;
|
|
FILE *f;
|
|
int swap = 0;
|
|
int32_t resp[INITGR_LEN];
|
|
uint32_t *nscdbuf = 0;
|
|
char *buf = 0;
|
|
char **mem = 0;
|
|
size_t nmem = 0;
|
|
size_t size;
|
|
nlim = *ngroups;
|
|
if (nlim >= 1) *groups++ = gid;
|
|
|
|
f = __nscd_query(GETINITGR, user, resp, sizeof resp, &swap);
|
|
if (!f) goto cleanup;
|
|
if (resp[INITGRFOUND]) {
|
|
nscdbuf = calloc(resp[INITGRNGRPS], sizeof(uint32_t));
|
|
if (!nscdbuf) goto cleanup;
|
|
size_t nbytes = sizeof(*nscdbuf)*resp[INITGRNGRPS];
|
|
if (nbytes && !fread(nscdbuf, nbytes, 1, f)) {
|
|
if (!ferror(f)) errno = EIO;
|
|
goto cleanup;
|
|
}
|
|
if (swap) {
|
|
for (i = 0; i < resp[INITGRNGRPS]; i++)
|
|
nscdbuf[i] = bswap_32(nscdbuf[i]);
|
|
}
|
|
}
|
|
fclose(f);
|
|
|
|
f = fopen("/etc/group", "rbe");
|
|
if (!f && errno != ENOENT && errno != ENOTDIR)
|
|
goto cleanup;
|
|
|
|
if (f) {
|
|
while (!(rv = __getgrent_a(f, &gr, &buf, &size, &mem, &nmem, &res)) && res) {
|
|
if (nscdbuf)
|
|
for (i=0; i < resp[INITGRNGRPS]; i++) {
|
|
if (nscdbuf[i] == gr.gr_gid) nscdbuf[i] = gid;
|
|
}
|
|
for (i=0; gr.gr_mem[i] && strcmp(user, gr.gr_mem[i]); i++);
|
|
if (!gr.gr_mem[i]) continue;
|
|
if (++n <= nlim) *groups++ = gr.gr_gid;
|
|
}
|
|
if (rv) {
|
|
errno = rv;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
if (nscdbuf) {
|
|
for(i=0; i < resp[INITGRNGRPS]; i++) {
|
|
if (nscdbuf[i] != gid)
|
|
if(++n <= nlim) *groups++ = nscdbuf[i];
|
|
}
|
|
}
|
|
|
|
ret = n > nlim ? -1 : n;
|
|
*ngroups = n;
|
|
|
|
cleanup:
|
|
if (f) fclose(f);
|
|
free(nscdbuf);
|
|
free(buf);
|
|
free(mem);
|
|
return ret;
|
|
}
|